VvEPA The Analysis of
Reg ulateci Contaminant
Protection
Agency
Occurrence Data from
Public Water Systems in
Support of the Second
Six-Year Review of
National Primary Drinking
Water Regulations
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Office of Water (4607M)
EPA-815-B-09-006
Revised September 2010
www.epa.gov/safewater
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Disclaimer
This report is in support of the preliminary revise/take no action decisions for EPA's
Second Six-Year Review of Existing Drinking Water Standards Federal Register Notice. This
report is intended to provide technical background for the second Six-Year Review.
This document is not a regulation itself, and it does not substitute for the Safe Drinking
Water Act (SOW A) or EPA's regulations. Mention of trade names or commercial products does
not constitute endorsement or recommendation for use.
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Acknowledgements
EPA's Office of Ground Water and Drinking Water (OGWDW) conducted the national
assessments of regulated contaminant occurrence in public drinking water presented in this
report in support of the second Six-Year Review of National Primary Drinking Water
Regulations. This effort was directed by Ms. Karen Wirth and Mr. Rajiv Khera.
EPA would like to thank the many states, territories, and tribes and their staff who
contributed datasets and valuable advice during EPA's compilation and review of the
contaminant occurrence (compliance monitoring) data. Thank you also to the many public water
systems and their staff who conducted the monitoring that provided the extensive amount of
regulated contaminant occurrence data used in this report.
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Executive Summary
The 1996 Amendments to the Safe Drinking Water Act (SOWA) require that the
Environmental Protection Agency (EPA) "shall, at least once every six years, review and revise,
as appropriate, each National Primary Drinking Water Regulation (NPDWR)." The NPDWRs
are often referred to as the national drinking water contaminant regulations or drinking water
standards. The 'Six-Year Review' process is an assessment of new information on the health
effects and national occurrence, and the new capabilities of treatment technologies and
laboratory analytical methods for the regulated contaminants. Through this process, EPA
determines whether the new information and technical capabilities provide a scientific basis to
support a revision of existing regulations that will improve public health protection.
This report presents the national contaminant occurrence assessments conducted in
support of EPA's second Six-Year Review ofNPDWRs. Included are detailed descriptions of the
national contaminant occurrence dataset compiled, the data management procedures conducted
to develop the national dataset, and the statistical analytical methods employed (using the
national dataset) to generate national estimates of regulated contaminant occurrence in public
drinking water systems.
Because there is no national database that receives and stores all relevant data regarding
the occurrence of regulated contaminants in public drinking water systems, EPA conducted a
voluntary data call-in from the states, territories, and tribes to obtain the data. EPA worked with
the states and primacy agencies to receive the states' and agencies' complete records of
compliance monitoring data (public drinking water system regulated contaminant occurrence
data) for 1998 through 2005. The compliance monitoring data were obtained through the
Information Collection Request (ICR) process.
Data management and quality assurance evaluations were conducted on all data received
to establish a high quality, national contaminant occurrence dataset consisting of data from 47
states/primacy agencies (45 states plus Region 8 and Region 9 tribes). The contaminant
occurrence data from these 47 entities comprise more than 15 million analytical records from
approximately 132,000 public water systems (PWSs) that serve approximately 254 million
people nationally. This dataset, the National Compliance Monitoring ICR Dataset for the second
Six-Year Review (or "Six-Year Review-ICR Dataset"), is the largest and most comprehensive
contaminant occurrence dataset ever compiled and analyzed by EPA's Drinking Water Program.
A two-stage analytical approach was conducted to estimate national contaminant
occurrence using the Six-Year Review-ICR Dataset. In the first stage of analysis (the "Stage 1
analysis"), the occurrence data were reviewed, quality-checked, characterized, and then analyzed
to generate simple non-parametric estimates of national contaminant occurrence in PWSs.
Simple counts were made of the number and percentage of systems, and population served by
systems, with at least one compliance monitoring sample result greater than a specified
contaminant concentration threshold. This Stage 1 analysis, based on maximum sample
concentration values, is inherently conservative; it is designed not to underestimate contaminant
occurrence for the consideration of public health protection. The Stage 1 analysis provides
occurrence assessments that may be more reflective of potential acute exposure. EPA selected a
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set of contaminants and also conducted additional parametric statistical estimations (the "Stage 2
analyses"). The Stage 2 analysis estimates long-term mean concentrations of contaminants in all
systems nationwide, generating occurrence analyses that are less conservative than the Stage 1
analysis. The Stage 2 analysis also provides occurrence assessments that may be more reflective
of potential chronic exposure.
Stage 1 analyses of approximate peak concentration measures were used to assess the
national occurrence of 65 regulated chemical and 4 radiological contaminants. Additional Stage
2 analyses using mean concentration measures were conducted for 22 of the 65 regulated
chemical contaminants. Several different variations of the Stage 1 and Stage 2 analyses were
conducted to broadly characterize national occurrence and are described and presented in this
report and its appendices. One variation of Stage 1 analyses estimates the percentage of
population served by systems nationwide that reported at least one sample analytical result
greater than the concentration equal to a contaminant's Maximum Contaminant Level (MCL; the
contaminant's drinking water standard). Using this measure, the range of occurrence and the top
five occurring regulated contaminants were estimated and summarized below grouped by
inorganic chemicals (lOCs), synthetic organic chemicals (SOCs), and volatile organic chemicals
(VOCs). The Stage 1 occurrence analyses conducted in this report, based roughly on peak
occurrence, are different from the occurrence analyses formally conducted to assess compliance
with contaminant drinking water standards (see Section 5.3 for details).
IOC occurrence based on the Stage 1 analysis relative to the MCL concentration ranged
from a high of nitrate with 7.310% of the total population served by systems reporting at least
one detection greater than the nitrate MCL concentration to the low of barium with 0.092% of
the total population served by systems reporting at least one detection greater than the barium
MCL concentration. The top five occurring lOCs based on this Stage 1 MCL measure are nitrate
(7.310%), nitrite (4.840%), antimony (1.505%), beryllium (1.386%), and arsenic (1.240%). The
percentage of arsenic relative to the MCL concentration is based on the former MCL of 0.05
mg/L.
SOC occurrence (based on the same Stage 1 analysis relative to the MCL concentration)
ranged from a high of di(2-ethylhexyl)phthalate with 6.397% of the total population served by
systems reporting at least one detection greater than the MCL concentration to a low of no
detections greater than the MCL concentrations for carbofuran, diquat, glyphosate,
hexachlorocyclopentadiene, methoxychlor, picloram and 2,4,5-trichlorophenoxypropionic acid
(silvex). The top five occurring SOCs based on this Stage 1 MCL measure are di(2-
ethylhexyl)phthalate (6.397%), l,2-dibromo-3-chloropropane (DBCP) (1.627%), atrazine
(1.551%), ethylene dibromide (1.201%), and benzo(a)pyrene (0.117%).
VOC occurrence (also based on the Stage 1 analysis relative to the MCL concentration)
ranged from a high of tetrachloroethylene with 6.448% of the total population served by systems
reporting at least one detection greater than the tetrachloroethylene MCL concentration to a low
of no detections greater than the MCL concentrations for 1,2-dichlorobenzene, trans-1,2-
dichloroethylene, ethylbenzene, monochlorobenzene, 1,2,4-trichlorobenzene and total xylenes.
The top five occurring VOCs based on this Stage 1 MCL measure are tetrachloroethylene
(6.448%), trichloroethylene (5.264%), 1,1-dichloroethylene (2.517%), carbon tetrachloride
(2.189%), and dichloromethane (1.298%). These population-related occurrence measures
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(approximate measures of potential exposure) for lOCs, SOCs, and VOCs track closely with
measures of occurrence based on the number of PWSs with at least one detection at a system-
level, rather than population served- level measure of occurrence.
The national occurrence of four radionuclides was also assessed using the same Stage 1
analysis that provides a preliminary estimate of potential exposure. Based on the estimated
percent of total population served by PWSs reporting at least one detection greater than each
contaminant's MCL concentration, the highest occurring radionuclide is uranium (11.884%).
Additionally, eleven SOCs and eleven VOCs were assessed using the Stage 2 analytical
approach. The Stage 2 occurrence analyses conducted in this report, based roughly on long-term,
multi-year average contaminant occurrence, are not the same as the occurrence analyses formally
conducted to assess compliance with contaminant drinking water standards (which for most
contaminants are based on annual average contaminant occurrence; see Section 5.3 for details).
Based on the population served by systems nationally with an estimated long-term mean
contaminant concentration greater than the respective MCL concentration, the SOCs had
occurrence as high as 0.014% (toxaphene) and as low as 0.000% (carbofuran, 2,4-
dichlorophenoxyacetic acid, endothall, hexachlorocyclopentadiene, and oxamyl). The two
highest occurring VOCs were tetrachloroethylene with 0.277% of the population served by
systems with a long-term mean greater than its MCL concentration, and trichloroethylene with
0.181% of the population served by systems with a long-term mean greater than its MCL
concentration. For three of the VOCs evaluated using the Stage 2 analysis -1,2-dichloropropane,
1,1,2-trichloroethane, and total xylenes- no PWS nationally had an estimated long-term mean
greater than each contaminant's respective MCL concentration.
Background information regarding the national contaminant occurrence data and data
management is presented in Sections 1 through 5 of this report. The summary of the Stage 1
analytical findings is presented in Section 6, with complete, detailed Stage 1 analysis findings for
all 65 chemical and 4 radiological contaminants included in Appendix A. The summary of the
Stage 2 analytical findings for 22 select contaminants is presented in Section 7, with complete
detailed Stage 2 occurrence findings for the 22 contaminants included in Appendix B.
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Contents
Disclaimer iii
Acknowledgements v
Executive Summary vii
Contents xi
1 Introduction 1
1.1 Purpose and Scope 2
1.2 Data Sources 2
1.3 Data Analysis 2
2 The National Compliance Monitoring-ICR Dataset for the Second Six-Year Review 4
2.1 Completeness and Representativeness of the Six-Year Review-ICR Dataset 5
3 Data Management 11
3.1 Dataset Consistency and Restructuring 13
3.2 Conversion to Complete and Unique Non-Detection Records 14
3.3 Identifying and Replacing Non-Numeric or Incorrect Non-Detection Records . 15
3.4 Establishing Consistent Data Fields for Analytical Results 16
3.5 Establishing Consistent Analytical Units 16
3.6 Records Excluded from Analyses 16
3.7 Missing System Inventory Data 18
3.8 Adjustments of Population Served by Public Water Systems 18
4 Data Quality Assurance/Quality Control 20
4.1 Review of Dataset Content 20
4.2 Data Element Completeness 20
4.3 Potential Outliers and Incorrect Units 23
5 Summary of the Compliance Monitoring Data 26
5.1 Characteristics of the Data - States, Systems and Records 26
5.2 Occurrence Variability Assessment 33
5.3 Threshold Evaluations 35
6 Stage 1 Analysis 36
6.1 Summary of Stage 1 Contaminant Occurrence Findings 36
6.2 Comparison of Stage 1 Analysis of First and Second Six-Year Reviews 46
6.3 System Sample Point Level Analysis 49
7 Stage 2 Analysis 54
7.1 Summary of Occurrence Estimations 55
8 Summary of Findings 57
9 References 59
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Exhibits
Exhibit 2-1. States with Compliance Monitoring Data Included in the Six-Year Review-ICR
Dataset 4
Exhibit 2-2. Comparison of the Total Number of Systems and Population Served by Systems in
the Baseline Handbook (2003) and the Six-Year Review-ICR Dataset, By State l 8
Exhibit 2-3. Comparison of the Total Number of Systems and Population Served by Systems in
the Baseline Handbook and the Six-Year Review-ICR Dataset, By Source Water Type
and System Type l 10
Exhibit 3-1. Summary of Compliance Monitoring Data Provided by States for the Second Six-
Year Review 11
Exhibit 3-2. Chemical Group Monitoring Requirements 17
Exhibit 4-1. Requested Data Elements 21
Exhibit 4-2. List of Contaminants for Which Data Were Requested from States 22
Exhibit 5-1. Number of Systems and Population Served by Systems in the Six-Year Review-
ICR Dataset, by Source Water Type 26
Exhibit 5-2. Number of Systems and Population Served by Systems in the Six-Year Review-ICR
Dataset, by System Size 26
Exhibit 5-3. Number of Systems and Population Served by Systems in the Six-Year Review-ICR
Dataset, by System Type 27
Exhibit 5-4. An Inventory of Contaminant Occurrence Data in the Six-Year Review-ICR
Dataset, by State 28
Exhibit 5-5. An Inventory of the Contaminant Occurrence Data in the Six-Year Review-ICR
Dataset, by Contaminant 30
Exhibit 6-1. Summary of Stage 1 Contaminant Occurrence Findings - Systems and Population
Served by Systems 40
Exhibit 6-2. Number and Percent of Systems and Population Served by Systems with Detections
Greater than the MCL Concentration 43
Exhibit 6-3. Comparison of Stage 1 Analyses of the First Six-Year Review and the Second Six-
Year Review based on the Percent of Systems 46
Exhibit 6-4. Summary of Stage 1 Contaminant Occurrence Findings - Sample Points and
Population Served by Sample Points 51
Exhibit 7-1. Comparison of Stage 1 and Stage 2 Analytical Results - Percent of Systems and
Population Served by Systems Greater than the MCL Concentration 55
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Appendices
APPENDIX A. Stage 1 Analysis Occurrence Measures for 65 Regulated Chemical and 4
Radionuclide Contaminants
APPENDIX B. Stage 2 Analysis Occurrence Measures for 22 Select Regulated Chemical
Contaminants
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Acronyms
CAS Chemical Abstracts Service
CWS Community Water System
DBCP l,2-Dibromo-3-chloropropane
DEHA Di(2-ethylhexyl)adipate
DEHP Di(2-ethylhexyl)phthalate
EDB Ethylene dibromide
EPA Environmental Protection Agency (United States)
EQL Estimated Quantitation Level
GW Ground Water
GWUDI Ground Water Under Direct Influence (of Surface Water)
ICR Information Collection Request
IOC Inorganic Chemical
LCR Lead and Copper Rule
MCL Maximum Contaminant Level
MDL Method Detection Limit
MFL Million Fibers per Liter
mg/L Milligrams per Liter
mrem/yr Millirem per year
MRL Minimum Reporting Level
ND Non-detect or Non-detection
NPDWR National Primary Drinking Water Regulation
NTNCWS Non-Transient Non-Community Water System
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OGWDW Office of Ground Water and Drinking Water
PCBs Polychlorinated Biphenyls
pCi/L Picocuries per Liter
PWS Public Water System
PWSID Public Water System Identification Number
QA Quality Assurance
QC Quality Control
SDWA Safe Drinking Water Act
SDWIS/Fed Safe Drinking Water Information System / Federal Version
SDWIS/State Safe Drinking Water Information System / State Version
SOC Synthetic Organic Chemical
SP Sample Point
SW Surface Water
TCE Trichloroethylene
TCR Total Coliform Rule
TNCWS Transient Non-Community Water System
USEPA United States Environmental Protection Agency
Hg/L Micrograms per Liter
VOC Volatile Organic Chemical
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1 Introduction
Pursuant to the 1996 Safe Drinking Water Act (SDWA) Amendments, the Environmental
Protection Agency (EPA) conducts, at least every six years, a review of the National Primary
Drinking Water Regulations (NPDWRs). For this "Six-Year Review" of the nation's public
drinking water standards, EPA assesses the occurrence of regulated contaminants in public water
systems (PWSs) in conjunction with other complementary assessments of health effects,
analytical feasibility, and treatment feasibility. Assessments are conducted to determine if
revisions to the existing NPDWRs (public drinking water standards) are appropriate. EPA
completed and published the results of its first Six-Year Review ofNPDWRs in July of 2003 (68
FR 42908, USEPA, 2003a) after developing a systematic approach, or protocol, for the review.
EPA has applied the same protocol with minor refinements to the current, second Six-Year
Review ofNPDWRs ("Six-Year Review 2"). This report presents the assessments of national
contaminant occurrence in PWSs in the United States in support of EPA's second Six-Year
Review ofNPDWRs.
Because there exists no national database of regulated drinking water contaminant
occurrence data for public drinking water systems, EPA conducted a voluntary data call-in from
the states, territories, and tribes to obtain the data using the Information Collection Request
(ICR) process. EPA worked with states and primacy agencies to receive their complete
compliance monitoring data for 1998 through 2005, and state data management staff were
consulted to resolve any questions about the data submitted. EPA conducted data management
and quality assurance (QA) evaluations to establish a high quality, national contaminant
occurrence database consisting of data from 47 states/primacy agencies (45 states plus Region 8
and Region 9 tribes). This dataset, referred to as the National Compliance Monitoring ICR
Dataset for the Second Six-Year Review (or "Six-Year Review-ICR Dataset"), is the largest and
most comprehensive compliance monitoring dataset ever compiled and analyzed by EPA's
Drinking Water Program. Using this dataset, EPA employed a two-stage analytical approach to
estimate a variety of occurrence measures to characterize the national occurrence of regulated
contaminants in systems to support the Six-Year Review process.
This report describes the extensive data management and data quality checks conducted
as part of the development of the Six-Year Review-ICR Dataset, explains the analytical approach
used to estimate the various measures of national contaminant occurrence, and presents and
describes the resulting national contaminant occurrence estimates. This report presents many
different measures and estimates of national occurrence. Some of the contaminant occurrence
measures are presented in this report as "preliminary exposure estimates." This means that they
are not formal exposure estimates, but estimates of the population served by systems found to
have some degree of contaminant occurrence in their drinking water samples. In addition to this
report, there are also two accompanying reports that present a shorter summary of contaminant
occurrence and preliminary exposure estimates as well as important background information on
each contaminant reviewed (USEPA, 2009a and b).
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1.1 Purpose and Scope
EPA's Office of Ground Water and Drinking Water (OGWDW) is responsible for
implementing the provisions of SDWA. Under SDWA, OGWDW develops regulations to
address the public health risks from contaminated drinking water and develops related programs
to protect ground water (GW) and surface water (SW) supplies. The 1996 Amendments to
SDWA require that EPA shall, at least once every six years, review and revise, as appropriate,
each NPDWR promulgated by the Agency. SDWA specifies that revision of a NPDWR shall
maintain or provide for greater protection of public health. Any revision of the regulations will
be partially dependent on contaminant occurrence findings, and on the reevaluation of the
public's exposure to the contaminants and the potential adverse health effects from that
exposure. The purpose of this report is to describe the contaminant occurrence data, data
management, and statistical methods used to develop the national contaminant occurrence
estimations in support of EPA's second Six-Year Review.
1.2 Data Sources
To estimate national occurrence of regulated contaminants in PWSs, it is necessary to
have all contaminant occurrence sample results including all sample analytical detections and
non-detections (NDs). The Federal Safe Drinking Water Information System database
(SDWIS/Fed) contains complete maximum contaminant level (MCL) violation data; however,
SDWIS/Fed does not receive or store complete compliance monitoring (parametric) records.
These data are collected by states and primacy agencies but are not required to be submitted to
SDWIS/Fed. Therefore, to obtain the necessary compliance monitoring parametric data to
support national occurrence assessments for the second Six-Year Review, EPA conducted a
voluntary data call-in from the states and primacy agencies. This data call-in was conducted
through the ICR process. The second Six-Year Review ICR document (USEPA, 2006) describes
the process undertaken to request the voluntary submission of compliance monitoring data by the
states.
Through the ICR process, EPA requested that states and primacy agencies voluntarily
submit their SDWA compliance monitoring data including all parametric data with complete
records of all sample detections and non-detections collected between January 1998 and
December 2005. Forty-six states and five other primacy agencies provided compliance
monitoring data that included parametric records. Through extensive data management efforts
and quality assurance evaluations as well as communications and consultations with state data
management staffs, EPA established a high quality contaminant occurrence dataset (the Six-Year
Review-ICR Dataset) that consists of data from 47 states/primacy agencies (45 states plus
Region 8 and Region 9 tribes). Data received from one state and three primacy agencies could
not be included in the second Six-Year data analyses. See Section 2 for details on states included
in the Six-Year Review-ICR Dataset.
1.3 Data Analysis
EPA used a two-stage analytical approach to estimate the national contaminant
occurrence using the Six-Year Review-ICR Dataset. The first stage of analysis provides a
simple, straightforward evaluation of occurrence of all contaminants. The "Stage 1 analysis" of
occurrence assesses the data sources, quality, and characteristics, and then uses the data to
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generate summary statistics of each contaminant's occurrence as well as national estimates of
occurrence that are simple, non-parametric, and conservative.l Occurrence analyses for each
contaminant are conducted for samples, systems, population served by systems, and system
sample point (SP) locations. A typical Stage 1 analysis is a simple count of the number or
percentage of systems reporting at least one sample detection of a specific contaminant, or at
least one sample detection with a concentration greater than the MCL value of the contaminant.
The details of the Stage 1 analysis methods are described in Section 6.
Based on the findings of the Stage 1 analysis, EPA selected a set of contaminants for
which additional parametric statistical estimations were warranted (referred to as "Stage 2
analyses"). The Stage 2 analysis estimates national contaminant occurrence by generating
estimated long-term mean concentrations of contaminants for each system. This provides
occurrence analyses that are less conservative than the Stage 1 analysis, since the Stage 2
analysis is based on estimated mean concentrations rather than on a single maximum
concentration. Also, because the Stage 2 analyses generate long-term (multi-year) mean
concentration estimates for contaminant occurrence at systems, the analyses can support
assessments of population served by systems with detections or "preliminary exposure"
assessments that may be more reflective of potential chronic exposure than the assessments from
the Stage 1 analyses. Section 7 describes the details of the Stage 2 analysis.
The Stage 1 analysis reflects a rough approximation of peak occurrence while the Stage 2
analysis is based on estimated long-term average occurrence. This fundamental difference
between the two analytical approaches has a very direct implication: regardless of the
contaminant concentration value assessed, the Stage 1 analysis findings will always exceed, or in
some cases be approximately equal to, the Stage 2 analysis findings. For example, the Stage 1
analysis of the number of systems with at least one detection of benzene greater than the MCL
concentration will always be greater than, or perhaps equal to, the Stage 2 analysis showing the
number of systems with a mean concentration of benzene greater than the MCL concentration.
This two-stage analytical approach was previously developed for other EPA OGWDW
national occurrence studies, including those conducted for the first Six-Year Review of
NPDWRs (USEPA, 2003b) and the first and second Regulatory Determinations for
Contaminants from the Drinking Water Contaminant Candidate List (USEPA, 2002, 2008a, and
2008b). The overall data management and general two-stage occurrence analytical approach used
for these OGWDW projects was peer-reviewed for use under the first Six-Year Review, which
assessed regulated contaminant occurrence data collected from 1993 to 1997. The Stage 2
analysis used for this second Six-Year Review has been simplified from the Stage 2 analysis
used for the first Six-Year Review. This was possible because a significantly larger number of
states provided contaminant occurrence data for the second Six-Year Review. See Section 7 for a
description of the new Stage 2 analysis.
1 The Stage 1 analyses are conservative in the sense that they are protective of human health (i.e., because they are
based on a single, maximum sample detection value rather than an average value for each system, the Stage 1
analyses are more likely to overestimate occurrence and potential risks to human health than underestimate them).
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2 The National Compliance Monitoring-ICR Dataset for
the Second Six-Year Review
Through the ICR process, EPA conducted a voluntary data call-in for states' compliance
monitoring records and received data from a total of 51 states/primacy agencies: 46 states;
American Samoa; Washington, D.C.; Region 8 tribes; Region 9 tribes, and the Navajo Nation.
Through extensive data management efforts, quality assurance evaluations, and communications
with state data management staff, EPA established the Six-Year Review-ICR Dataset. This high
quality, national contaminant occurrence database consists of data from 45 states and 2 primacy
agencies (see Exhibit 2-1 below). The data received from American Samoa, Washington, D.C.,
and the Navajo Nation was not included in the second Six-Year data analyses because those
datasets were in significantly different formats that would require excessive effort to transform.
The data from Kansas were received after the data assessment and quality assurance measures
were completed and were not included in this occurrence analysis.
Exhibit 2-1. States with Compliance Monitoring Data Included
in the Six-Year Review-ICR Dataset
D American Samoa
D District of Columbia
D Guam
D Northern Mariana Islands
D Puerto Rico
• Region 8 Tribes
D Region 9 Navajo Nation
• Region 9 Tribes
D Virgin Islands
| Data used
| | Data available but not used
| | Data not available
The compliance monitoring contaminant occurrence data from these 47 states/primacy
agencies comprise more than 15 million analytical records from approximately 132,000 systems.
Approximately 254 million people are served by these systems nationally.
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Data quality, completeness, and representativeness are key considerations for the dataset.
Given the size, scope, and variety of formats of the datasets received from the states, EPA
conducted extensive data management and quality assurance/quality control (QA/QC)
assessments on the data to be included in the Six-Year Review-ICR Dataset. A review of
completeness and representativeness is presented later in this section, with other details of data
management and quality assessments presented in the following three sections.
2.1 Completeness and Representativeness of the Six-Year Review-ICR
Dataset
The final Six-Year Review-ICR Dataset consists of compliance monitoring data received
from 47 out of 59 states/primacy agencies representing a very large sample and the largest
compliance monitoring dataset ever compiled and analyzed by EPA's Drinking Water Program.
The 45 states that provided data for the Six-Year Review-ICR Dataset comprise 88% of all
public drinking water systems and 89% of the total population served by PWSs nationally, and
represent all regions nationally.2 The states not included in the Six-Year Review-ICR Dataset
(see Exhibit 2-1) represent approximately 12% of systems and 11% of the population served by
systems nationally. These five states are geographically distributed across the United States and
reflect a diverse mix of urban, agricultural, and industrial areas. The five states not providing
compliance monitoring contaminant occurrence data are not clustered in a single region so no
regional geologic terrain, climatic or hydrologic zone, geography, or socio-economic activity is
unrepresented in the dataset. Although two neighboring states on the Gulf Coast, Louisiana and
Mississippi, did not provide data, the three other Gulf Coast states did provide data, allowing for
significant regional coverage, especially from a population-based perspective. The Six-Year
Review-ICR Dataset, with 45 of the 50 states represented, is therefore considered reasonably
complete and nationally representative as the basis of the contaminant occurrence estimates
presented in this report.
The absence of data from five states in the final Six-Year Review-ICR Dataset could
potentially bias how well this dataset represents the national occurrence of particular
contaminants. However, in a general sense, the five states, representing about 11% of PWSs and
population served by PWSs nationally, have a fairly small influence relative to a national
aggregate occurrence rate based on 45 states, representing about 89% of the PWSs and
population served by PWSs nationally. To address the issue of potential bias, though, EPA
conducted an assessment for each contaminant by comparing occurrence in the 5 states to that in
the 45 states.
Because a complete compliance monitoring dataset of all 50 states does not exist, it is not
possible to know the true national occurrence for a particular contaminant or how occurrence
rates for a particular contaminant in the 5 missing states compare to occurrence in the other 45
states. Therefore, an indicator of occurrence was developed using data available from the
SDWIS/Fed database. EPA compiled SDWIS/Fed records of MCL violations by state for the
2 This completeness assessment focuses on the 50 states and does not include the primacy entities (territories and
tribes), given the total population-served by PWSs in the states as compared to the primacy entities.
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same years (1998-2005) as the Six-Year Review-ICR Dataset.3 The MCL violation records were
used to determine if the violation rate, the indicator of contaminant occurrence, in the five
missing states was greater than, less than, or about the same as the violation rate in the 45 states
in the dataset. This assessment was conducted for all individual contaminants.
The mean MCL violation rate, the percentage of systems with at least one MCL violation,
for each contaminant was calculated in aggregate for the 45 states in the dataset and separately in
aggregate for the 5 states not in the Six Year Review-ICR Dataset. For each contaminant, these
two estimated means (45 state vs. 5 state) were compared with a simple statistical t-test to
determine if the mean MCL violation rate for the 5 missing states was significantly different
from the mean MCL violation rate for the 45 states.4
Of the 69 contaminants evaluated, 58 had no significant difference in MCL violation
rates between the 5-state and the 45-state groups. For four contaminants - arsenic, nitrate,
tetrachloroethylene, and trichloroethylene - the MCL violation rate for the five missing states
was statistically determined to be higher than the rate for the 45 states in the dataset. This finding
suggests that the absence of system compliance monitoring data from the five states might result
in some slight amount of under-estimation of occurrence for those four contaminants. For seven
contaminants; fluoride, asbestos, di(2-ethylhexyl)phthalate (DEHP), l,2-dibromo-3-
chloropropane (DBCP), alpha particles, uranium, and combined radium-226/228, the MCL
violation rate for the five missing states was statistically determined to be lower than the rate for
the 45 states in the dataset. This suggests that the absence of system compliance monitoring data
from the five states might result in some slight amount of over-estimation of occurrence for those
seven contaminants. These findings are most appropriately used as context or background for the
quantitative occurrence findings presented in Sections 6 and 7 of this report.
To further evaluate the completeness of each state's dataset, EPA compared the number
of systems in each state's submitted Six-Year Review-ICR data to the number of systems listed
as operating in each state according to the latest edition of the Drinking Water Baseline
Handbook (USEPA, 2003c). The "Baseline Handbook" is a standard source for national PWS
inventory information (Exhibits 2-2 and 2-3). These comparisons indicate that the data in the
Six-Year Review-ICR Dataset are reasonably complete. Because of differences between the
system inventory information contained in the Baseline Handbook versus that in the Six Year
Review-ICR Dataset, this completeness assessment is more general than specific.
The system inventory information represented in the two data sources is quite similar
though not equivalent. The main difference is that the Six-Year Review-ICR Dataset reflects the
total number of systems with compliance monitoring data in any of the eight years represented in
the dataset (1998-2005), while the Baseline Handbook numbers reflect the number of systems in
a single year (2002). Since systems open, close, and consolidate over time, the number of
3 While the SDWIS/Fed database does not store complete compliance monitoring parametric records, the database
does maintain the most current and complete national and state records of contaminant MCL violations. Annual
MCL data were downloaded from http://www.epa.gov/safewater/data/pivottables.html.
4 The t-test calculation used considered the variance, mean, and sample size of each of the two groups of states to
estimate the probability that the observed difference in sample means represents an actual difference in contaminant
occurrence and not just a statistical inconsistency resulting from low sample sizes.
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systems in each state will understandably be somewhat different between the two data sources.
Population changes in system service areas over time could also contribute to differences in
population served numbers for systems between the two data sources. Also, the numbers
presented for the Baseline Handbook do not include tribal water systems and the Six-Year
Review-ICR Dataset includes data for Region 8 and Region 9 tribes. In addition, the Baseline
Handbook numbers include both "purchased systems" (systems that purchase 100% of their
water) and "non-purchased systems" (systems that self-source water and/or buy less than 100%
of their water) while the Six-Year Review-ICR Dataset excludes systems that purchase 100% of
their water. Purchased systems do not have the same compliance monitoring requirements as
other systems so the purchased systems were excluded from these occurrence analyses.
However, because their populations are at risk of exposure to a contaminant, EPA adjusted the
population served numbers for the state datasets to account for populations that are served by
purchased systems. These adjusted population served values should approximately equal the raw,
unadjusted population served values for all purchased and non-purchased systems in the Baseline
Handbook.5 Therefore, only general comparisons can be made. Nonetheless, the system and
population served values from both sources of data compare fairly well; it appears that the states
provided essentially all compliance monitoring records as specified in the Six-Year Review-ICR
data request, and the comparison suggests that the Six-Year Review-ICR Dataset is essentially
complete.
Overall, for the 45 states in the dataset there is an approximately 0.1% difference between
the number of systems listed in the Baseline Handbook compared to the number of systems in
the data submitted by the 45 states for the second Six-Year Review (Exhibit 2-2). Comparing the
number of systems for each state, the percentage difference between the Baseline Handbook and
the Six-Year Review-ICR data ranges from less than 1% difference (e.g., Oklahoma and Rhode
Island) to almost a 50% difference (e.g., Montana and Virginia) in the number of systems. Based
on the population served by systems, for the overall national 45-state total, there is a 1.8%
difference between the total population-served by systems listed in the Baseline Handbook
compared to the population served by systems in the data submitted by the 45 states for the
second Six-Year Review. Comparing individual state population served values, the percentage
differences between the Baseline Handbook and the Six-Year states ranges from less than a 1%
difference (e.g., Arkansas and West Virginia) to approximately a 50% difference (e.g., Nevada).
In communications with states' data management staff, several mentioned that population growth
in the Southwestern United States probably accounts for some of the population differences
between the Baseline Handbook estimates (from 2003 and earlier) to the estimates from the Six-
Year Review-ICR Dataset (with most system population information from 2005). Also, in
Nevada, for the population adjustments made regarding purchased systems, it was not possible to
determine seller-purchaser links for a single very large system serving about 1 million people.
Therefore, the Nevada population served total for the Six-Year Review-ICR data are
approximately 1 million less that the number presented in the Baseline Handbook. See Section
3.8 for details of the population adjustments and seller-purchaser links.
5 The adjusted population-served values reflect the addition of the population-served by systems that purchase 100%
of their water because the population-served by those 100% purchasing systems would otherwise be excluded from
the Six-Year Review analyses. Details on this adjustment are presented in Section 3.8.
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Exhibit 2-2. Comparison of the Total Number of Systems and Population Served
by Systems in the Baseline Handbook (2003) and the Six-Year Review-ICR
Dataset, By State 1
State
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kentucky
Maine
Maryland
Massachusetts
Michigan
Minnesota
Missouri
Montana
Nebraska
Nevada6
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Total Number of Systems2
Baseline
Handbook3
433
1,516
1,594
776
5,710
1,922
3,016
555
6,327
2,411
112
2,032
4,675
4,235
1,750
449
1,980
3,742
1,502
11,900
7,869
2,473
1,830
1,225
595
2,143
4,046
1,246
9,340
7,213
392
5,373
1,043
2,625
468
1,290
521
841
5,670
859
1,368
Six-Year
Review-ICR
Data
425
1,477
1,663
456
7,605
1,748
2,918
580
6,261
1,931
116
1,955
3,957
5,338
1,899
298
2,257
4,105
1,697
14,521
9,408
2,691
1,014
792
577
2,643
4,221
885
6,677
6,559
218
5,078
1,036
2,672
470
1,650
432
369
6,453
999
1,317
Percent
Difference
1.8%
2.6%
-4.3%
41.2%
-33.2%
9.1%
3.2%
-4.5%
1.0%
19.9%
-3.6%
3.8%
15.4%
-26.0%
-8.5%
33.6%
-14.0%
-9.7%
-13.0%
-22.0%
-19.6%
-8.8%
44.6%
35.3%
3.0%
-23.3%
-4.3%
29.0%
28.5%
9.1%
44.4%
5.5%
0.7%
-1.8%
-0.4%
-27.9%
17.1%
56.1%
-13.8%
-16.3%
3.7%
Total Population Served by All Systems
Baseline
Handbook3'4
5,140,563
597,332
4,991,548
2,469,902
32,654,400
5,753,222
2,862,278
894,435
16,699,708
7,215,332
1,292,059
1,074,492
11,770,883
5,065,608
2,626,823
4,469,109
887,053
4,759,189
7,122,088
8,957,282
4,557,788
5,035,937
911,871
1,528,468
1,981,791
1,090,766
8,431,376
1,807,797
18,925,806
6,809,879
570,872
10,840,585
3,476,517
3,132,622
1,350,943
3,413,847
688,061
5,422,136
22,385,504
3,813,258
647,415
Six-Year
Review-ICR
Data5
4,741,994
712,666
6,292,843
2,453,733
38,646,745
5,259,232
2,787,413
778,333
18,939,279
7,500,353
1,310,187
1,206,368
9,630,392
5,492,975
2,653,189
4,619,135
950,371
5,279,878
8,738,481
8,850,281
4,898,639
4,976,894
786,930
1,469,627
998,101
1,282,866
8,258,339
1,735,210
14,827,610
7,351,966
563,112
10,691,928
3,173,290
3,182,082
968,684
3,777,736
676,911
5,686,766
25,418,822
2,638,287
596,375
Percent
Difference
7.8%
-19.3%
-26.1%
0.7%
-18.4%
8.6%
2.6%
13.0%
-13.4%
-4.0%
-1 .4%
-12.3%
18.2%
-8.4%
-1.0%
-3.4%
-7.1%
-10.9%
-22.7%
1.2%
-7.5%
1.2%
13.7%
3.8%
49.6%
-17.6%
2.1%
4.0%
21.7%
-8.0%
1 .4%
1.4%
8.7%
-1.6%
28.3%
-10.7%
1 .6%
-4.9%
-13.6%
30.8%
7.9%
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State
Virginia
West Virginia
Wisconsin
Wyoming
Total
Total Number of Systems2
Baseline
Handbook3
3,369
1,066
11,455
681
131,638
Six-Year
Review-ICR
Data
1,820
1,123
7,013
636
127,960
Percent
Difference
46.0%
-5.3%
38.8%
6.6%
0.1%
Total Population Served by All Systems
Baseline
Handbook3'4
8,495,323
1,502,322
4,665,249
527,201
249,316,640
Six-Year
Review-ICR
Data5
6,245,276
1,503,712
4,719,892
521,508
253,794,411
Percent
Difference
26.5%
-0.1%
-1 .2%
1.1%
-1.8%
1. The number of systems and population served by tribal water systems in Regions 8 and 9 are not included in the
Baseline Handbook numbers in this table.
2. As indicated in Exhibit 5-3, approximately 58% of the total number of water systems whose data were submitted by
states for the second Six-Year Review are transient non-community water systems. Because only the nitrate/nitrite
regulations require compliance monitoring by these transient systems (see Exhibit 3-2), data from the transient
systems were included only for the nitrate and nitrite occurrence analyses and were excluded for all occurrence
analyses for inorganic chemicals (lOCs), synthetic organic chemicals (SOCs), volatile organic chemicals (VOCs), and
radiological contaminants. The tables in Appendix A present the total number of community plus non-transient non-
community water systems included in the occurrence analyses for each state for all lOCs, SOCs, VOCs, the total
number of community plus non-transient non-community plus transient non-community water systems for nitrate and
nitrite, and the total number of community water systems for radionuclides.
3. The source of these data is the Drinking Water Baseline Handbook, Fourth edition (USEPA, 2003c).
4. The Baseline Handbook population numbers in this column represent the population served by purchased and
non-purchased systems.
5. The Six-Year Review-ICR data population numbers in this column represent the adjusted wholesale/retail
population served by all non-purchased systems. See Section 3.8 for details on the population adjustments.
6. For the population adjustments made regarding purchased systems, it was not possible to determine seller-
purchaser links for a single very large system in Nevada serving about 1 million people. Therefore, the Nevada
population served total for the Six-Year Review-ICR data are approximately 1 million less that the number presented
in the Baseline Handbook. See Section 3.8 regarding population adjustments and seller-purchaser links.
Exhibit 2-3 compares the number of non-purchased systems and population served by
these systems in the Baseline Handbook and the Six-Year Review-ICR Dataset stratified by
source water type and system type. The overall national 45-state totals indicate about 0.1% less
systems and a 1.8% more population served in the Six-Year Review-ICR Dataset than is
represented in the Baseline Handbook. For community water systems (CWSs), there is about a
2% difference based on the number of systems and a 2% difference based on the population
served by systems. Percentage differences were larger for ground water systems than surface
water systems. For non-transient non-community water systems (NTNCWSs), there is about a
14% difference based on the number of systems and a 10% difference based on the population
served by systems. For transient non-community water systems (TNCWSs), there is about a 4%
difference based on the number of systems and a 10% difference based on the population served
by systems. CWSs account for approximately 94% of the total population served by systems in
the United States.
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Exhibit 2-3. Comparison of the Total Number of Systems and Population Served by Systems in the Baseline
Handbook and the Six-Year Review-ICR Dataset, By Source Water Type and System Type 1
Source
Water Type
Community
Water Systems (CWS)
Baseline
Handbook
Six-Year
Review-ICR
Data
Non-Transient
Non-Community
Water Systems
(NCNCWS)
Baseline
Handbook
Six-Year
Review-ICR
Data
Transient
Non-Community
Water Systems (TNCWS)
Baseline
Handbook
Six-Year
Review-ICR
Data
Unknown System Type 2
Baseline
Handbook
Six-Year
Review-ICR
Data
Total
Baseline
Handbook
Six-Year
Review-ICR
Data
Number of Non-Purchased Systems
Ground
Water (GW)
Surface
Water (SW)
Total
32,343
4,215
36,558
33,080
4,134
37,214
15,809
327
16,136
18,002
319
18,321
77,658
1,286
78,944
74,690
1,011
75,701
0
0
0
307
7
314
125,810
5,828
131,638
126,079
5,471
131,550
Total Population Served 3
Ground
Water (GW)
Surface
Water (SW)
Total
72,377,555
160,485,186
232,862,741
85,195,608
152,805,883
238,001,491
4,432,931
419,062
4,851,993
4,931,440
398,629
5,330,069
10,891,422
710,484
11,601,906
9,946,745
492,774
10,439,519
0
0
0
22,122
1,210
23,332
87,701,908
161,614,732
249,316,640
100,095,915
153,698,496
253,794,411
1. The number of systems and population served by tribal water systems in Regions 8 and 9 are not included in the Baseline Handbook numbers in this table.
2. Systems with unknown system type (i.e., no system type was specified in the data) were included in the second Six-Year Review analyses. None of the occurrence
analyses conducted for the second Six-Year Review required specifying the system type.
3. The Baseline Handbook population numbers represent the population served by purchased and non-purchased systems. The Six-Year Review-ICR data population
numbers represent the adjusted wholesale/retail population served by all non-purchased systems. See Section 3.8 for details on the population adjustments.
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3 Data Management
The data received from the states and primacy agencies were in a variety of formats and
data structures, and required reformatting to an exact uniform structure to enable the national
contaminant occurrence analyses. This section provides an overview of the data management
efforts that were conducted to enable and facilitate the contaminant occurrence analyses. Details
of the data management measures can be found in the report titled "The Data Management and
Quality Assurance/Quality Control Process Used to Edit the State Compliance Monitoring
Datasets Submitted for the Six-Year Review" (Cadmus, 2008).
More than half of all states currently store and manage at least portions of their
compliance monitoring data in the Safe Drinking Water Information System/State Version
(SDWIS/State). The majority of states using SDWIS/State that submitted data to EPA used a
SDWIS Query Extract Tool, developed and provided by EPA, to extract and compile the
compliance monitoring data requested by EPA. (Only two states that use SDWIS/State did not
use the SDWIS Query Extract Tool to compile the requested data. These states submitted their
data to EPA for use in the Six-Year Review before the SDWIS Query Extract Tool was available
to the states.) The Extract Tool enabled a streamlined effort by states to select, compile, and
format the requested data, and generally resulted in state submission of complete datasets that
were uniform in format. The states not using SDWIS/State submitted their compliance
monitoring data "as is," resulting in a variety of formats of datasets submitted to EPA.
Exhibit 3-1 summarizes the types of files, SDWIS/State status, use of the extract tool, and
date range of the data provided by states. Note that SDWIS/State status is based on status at the
time the voluntary data call-in was conducted and does not reflect subsequent changes in status.
Exhibit 3-1. Summary of Compliance Monitoring Data Provided by States for the
Second Six-Year Review
State/Tribe
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
Florida
Georgia
File Type
Access
Access
Access
Access
dBase
Access
Access
Access
Excel
Access
SDWIS/
State User
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
No
Yes
SDWIS
Extract Tool
Yes
Yes
Yes
No
N/A
Yes
Yes
Yes
N/A
Yes
Date Range
1/5/1998-12/30/2005
1/5/1998-12/31/2005
1/1/1998-12/31/2005
1/1/1998-12/31/2005
1/1995-4/2007
1/1/1998-12/30/2005
1/1/2002-12/31/2005
10/22/1998 - 12/28/2005 (lOCs)
9/13/2000 - 12/28/2005 (VOCsJ
1/1/2001 - 12/28/2005 (SOCsy
1/2/2004-12/31/2005
3/10/1998-12/31/2005
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State/Tribe
Hawaii
Idaho
Illinois
Indiana
Iowa
Kentucky
Maine
Maryland
Massachusetts
Michigan
Minnesota
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Region 8 tribes
Region 9 tribes
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
File Type
Excel
Access
Access (CWS);
Excel (NTNC)
Access
Access
Access
Access
Excel
Access
Comma delimited
Text
Access
Access
Access
Access
Comma delimited
Access
Access
Access
Oracle
Access
Access
Access
Access
Access
Access
Access
Access
dBase
Excel
Text
Text
Access
SDWIS/
State User
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
No
No
No
Yes
Yes
SDWIS
Extract Tool
N/A
Yes
No
Yes
Yes
Yes
Yes
N/A
N/A
N/A
N/A
Yes
Yes
Yes
Yes
N/A
Yes
Yes
Yes
N/A
Yes
Yes
Yes
Yes
Yes
N/A
Yes
Yes
N/A
N/A
No
Yes
Yes
Date Range
1/3/2000-12/15/2005
1/1/1998-12/31/2005
1/5/1998-12/31/2005
1/1/1998-12/31/2005
1/1/1998-12/31/2005
1/2/1998-12/30/2005
1/5/1998-12/31/2005
1/1/1998-12/31/2005
1/2/1998-12/30/2005
1/1/1998-12/31/2005
1/1/1998-12/29/2005
1/1/1998-12/31/2005
1/5/1998-12/31/2005
1/1/1998-12/31/2005
1/1/1998-12/31/2005
4/1/1998-10/31/2005
1/2/1998-12/30/2005
1/5/1998-12/31/2005
1/5/1998-12/31/2005
1/1/1998-12/31/2005
1/1/1998-12/31/2005
1/5/1998-12/31/2005
1/2/1998-12/30/2005
4/8/1998-12/31/2005
1/5/1998-12/31/2005
1/5/1998-12/30/2005
1/5/1998-12/30/2005
1/1/2001 -12/31/2005
1/26/1993-2/26/2007
1/5/1998-12/30/2005
1/2/1998-12/31/2005
1/5/1998-12/30/2005
1/4/1998-12/30/2005
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State/Tribe
Virginia
West Virginia
Wisconsin
Wyoming
File Type
Access
Access
Tab delimited
Access
SDWIS/
State User
Yes
Yes
No
Yes
SDWIS
Extract Tool
Yes
Yes
N/A
Yes
Date Range
1/3/1998-12/31/2005
1/5/1998-12/31/2005
1/2/1998-6/8/2007
1/1/1998-12/30/2005
1. Inorganic chemicals (lOCs), volatile organic chemicals (VOCs) and synthetic organic chemicals (SOCs).
3.1 Dataset Consistency and Restructuring
Upon receipt of each state dataset, a state-specific directory was created to contain the
raw data. The original dataset was saved and maintained exactly as received. All subsequent
changes were made and saved to a copy of the original dataset and each change was documented.
Status documentation for each state was maintained and periodically sent to EPA. The
status update documented and described the datasets received to date, as well as the date
received, file type, whether or not the SDWIS Query Extract Tool was used, and the date range
of the data. The status update also described any current or ongoing state-specific notes, issues or
concerns.
Thirty-one states and one tribe used the SDWIS Query Extract Tool to extract all or some
of their chemical data; therefore, those datasets were all submitted in a similar format. States that
did not use the SDWIS Query Extract Tool were restructured into a format similar to the data
structure of the SDWIS Query Extract Tool. Some notable exceptions were a few states that
compiled and sent one portion of their data using the SDWIS Query Extract Tool and the
remainder of their data in another structure (for example, South Carolina). The data submitted by
these states required extensive QA/QC and formatting effort to prepare for analyses because the
multiple data structures for a single state's dataset had to be separately formatted and then
combined.
The SDWIS Query Tool extracts the SDWIS/State data into Microsoft Access. The 15
states that did not use the SDWIS Query Extract Tool submitted data in a variety of formats,
including dBase, Oracle, Microsoft Access, comma delimited, tab delimited, Text, and Excel. All
of these datasets were converted to Microsoft Access to enable a detailed QA/QC review.
For the 15 states and one tribe for which the SDWIS Query Extract Tool was not used or
was not applicable, the datasets were converted to similar formats and data structure to facilitate
data management and analysis. In all cases, the converted datasets were compared to the original
datasets to ensure all data were converted accurately. A few states submitted their data in several
different files that were in different structures or software (California, Illinois, Maryland,
Michigan, South Carolina, South Dakota, and Texas). These states submitted datasets that were
divided or organized by chemical group, date range, system type, or by some other system
reflecting multiple data management schemes within the particular state. The multiple structures
for each of these states' datasets had to be separately formatted and then combined.
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3.2 Conversion to Complete and Unique Non-Detection Records
To conduct contaminant occurrence estimates, each contaminant sample record must
have an analytical result, whether that sample result is a detection (sample analytical result
greater than or equal to the minimum reporting level (MRL)) or a non-detection. Sample records
reported as non-detects tend to be less uniform and less complete than sample records for
detections. Of the 47 states/primacy agencies that submitted compliance monitoring data for the
second Six-Year Review, only 33 submitted at least some records that were explicitly labeled as
MRL data. See Section 3.3 for additional details on MRLs. Approximately 70% of the system
sample records submitted by those 33 states included explicitly labeled MRL information. Some
systems in a particular state might report all MRL data while other systems in the same state
might report only partial or no MRL data.
EPA replaced any missing non-detect results with the most common modal MRL value
for the state in which the system was located. In some cases, though, all MRL data for a specific
contaminant's data from an entire state were missing. In these cases, the missing values were
replaced with the national modal MRL derived as the mode of all the state modal MRL values
for that contaminant.
Several states submitted datasets with incomplete sample non-detect records due to
aggregated or summarized non-detection results for multi-analyte laboratory methods. Records
contained a single "0" or "ND" for all contaminants not detected and individual, unique numeric
detection records only for those contaminants with a positive result. Special processing was
required to establish complete non-detect records for all contaminants analyzed with the multi-
analyte method. For example, one specific EPA-certified laboratory method can analyze for 21
different volatile organic chemicals (VOCs). If none of the 21 VOCs is detected, these states
simply enter a single code such as "21 VOCs" in the contaminant identification field and a "0" or
"ND" in the results field. In these cases, the single reported non-detection record was expanded
to 21 separate records each with the appropriate unique contaminant identification code and each
record was given a "
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3.3 Identifying and Replacing Non-Numeric or Incorrect Non-Detection
Records
The MRL is defined as the lowest concentration value that can be reliably achieved
within specified limits of precision and accuracy under routine laboratory operating conditions.6
For the states that did report MRL data for systems, some recorded it in the analytical result field
and also included a "<" in a corresponding field to identify the record as a non-detection. Other
states simply included a zero or negative result in the analytical result field to signify a non-
detection.
The Six-Year Review Stage 1 non-parametric analyses are not affected by how non-
detections are recorded. However, to estimate mean contaminant concentration values for each
system in the Stage 2 analyses, a non-zero MRL numeric value must replace all analytical results
that were reported either as zero, "non-detection," "ND," etc.
Similar to replacing missing MRL data above, a convention was developed to replace any
non-numeric non-detection results from a particular system using the modal MRL value for the
state in which the system was located. If a state reported no MRL data, the non-numeric values
were replaced with the national modal MRL, derived as the mode of all state modal MRL values
reported for that contaminant.
EPA used similar data management measures when states reported MRL values that were
extremely low or high. A process was developed for identifying and replacing such values with
more reasonable MRL values. Reported MRL values that were below the minimum Method
Detection Limit (MDL)7 or greater than the national modal MRL or missing were replaced with
the national modal MRL.8 Approximately 60% of non-detections in the Six-Year Review-ICR
6 In other words, the MRL is the lowest contaminant concentration that can be dependably quantified in the
laboratory and reported in the contaminant occurrence data used for analyses. Contaminant sample records reported
as "
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dataset were updated with a national modal MRL value because the data submitted by the
states/primacy agencies did not specify an MRL. Less than 1% of the data were updated with a
national modal MRL because the original MRL supplied was less than the minimum MDL, and
therefore appeared to be incorrect. Approximately 5% of the non-detection data were replaced
with the national modal MRL because the original value was greater than the national modal
MRL. While MRLs approaching the MCL concentration are possible, their inclusion could
inflate Stage 2 occurrence estimates that generate system long-term mean concentrations using
the MRL values as surrogates for sample non-detections. In these calculations, the MRL values
used have a very limited effect on the resulting estimates of contaminant mean concentrations.
See Section 7 for details on the Stage 2 analysis.
3.4 Establishing Consistent Data Fields for Analytical Results
The datasets of those states that used the SDWIS Query Extract Tool, as well as the
datasets of some of the states that did not, included analytical results signs (e.g., "<" for non-
detections or "=" for detections), detection limits, and analytical results data in multiple fields.
For this analysis, however, it was important to have a single data element for the result sign,
indicating whether the record was less than or equal to the corresponding number in the Value
field, and a single data element for the Value, equal to the analytical result if the record is a
detect and equal to the detection limit if the record is a non-detect. A "Detect" field was added to
all of the state datasets to identify the results sign. Wherever the analytical result was greater
than zero and the result sign indicated a detection, then Detect was set equal to 1, representing a
detection. When the analytical result was equal to zero and/or the result sign indicated a non-
detection, then Detect was set equal to 0 (i.e., a non-detect). A "Value" field was also added to
all of the state datasets. For all non-detections, Value was set equal to the detection limit; for all
detects, Value was set equal to the analytical result.
3.5 Establishing Consistent Analytical Units
Data were received in a variety of units. However, the data for each individual
contaminant needed to be expressed in a single unit in order to facilitate analysis. Chemical
monitoring data were received in both milligrams per liter (mg/L) and micrograms per liter
(|ig/L). For this analysis, all data for lOCs were converted to mg/L, while all data for the
synthetic organic chemicals SOCs, VOCs, and uranium were converted to |ig/L. Data for alpha
particles, beta particles,9 and combined radium-226/228 were analyzed in picocuries per liter
(pCi/L).
3.6 Records Excluded from Analyses
All monitoring data from purchased systems (systems that purchase 100% of their water)
were excluded from the final Six-Year Review-ICR Dataset because these systems have different
9 Although the MCL for beta particles, 4 mrem/yr, is in the unit of measure of millirem per year (mrem/yr), the
primary unit of analytical measure is picocuries per liter (pCi/L). This unit of measure relates to screening thresholds
of 15 pCi/L and 50 pCi/L that are defined in the 2000 Radionuclides Rule. More than 95% of all compliance
monitoring data for beta particles submitted by the states to EPA were in units of pCi/L. The analyses presented here
are based on compliance monitoring data represented in units of pCi/L and are conducted relative to the screening
threshold of 50 pCi/L.
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monitoring requirements than the non-purchased water systems that provide the compliance
monitoring data for the second Six-Year Review occurrence analyses.
All monitoring data from non-public water systems (systems with fewer than 25 service
connections and that serve a population of fewer than 25) were also excluded from the analysis.10
Non-public water systems are not required to collect compliance monitoring data for regulated
contaminants. All of the states that used the SDWIS Query Extract Tool had data from non-
public water systems in their original data submittal.
Furthermore, only standard SDWA compliance samples for regulated contaminants were
analyzed to generate national contaminant occurrence estimates. Any "special" or
"investigation" samples were excluded from the working dataset. If necessary, those data could
be managed and quality-checked separately for possible use in supplementary occurrence
analyses. For example, any high frequency samples could support assessments of the seasonal
occurrence of pesticides. The SDWIS Query Extract Tool was designed to pull only compliance
monitoring data. Several states submitted non-compliance monitoring results: Arkansas, Hawaii,
Illinois, Massachusetts, Maryland, Michigan, New Hampshire, New York, Region 9 tribes, South
Carolina, Tennessee, and Wisconsin. In addition, the following states submitted data for
unregulated contaminants: California, Florida, Illinois, Michigan, Minnesota, North Carolina,
Nebraska, Region 9 tribes, South Dakota, Tennessee, Texas, and Wisconsin.
Exhibit 3-2 lists the systems that are required to sample for the contaminants within each
chemical group. All data that passed the QA/QC process from these systems were included in the
second Six-Year Review analyses. Data from systems that were not required to sample for a
given contaminant (e.g., SOC data from transient systems or radionuclide data from transient or
non-transient non-community systems) were excluded from the second Six-Year Review
analyses.
Exhibit 3-2. Chemical Group Monitoring Requirements
Chemical Group
Inorganic
Chemicals (lOCs)
Nitrate and Nitrite
Synthetic Organic
Chemicals
(SOCs)
System Types Required to Sample
(sample data included in analyses)
All non-purchased community water systems
and non-transient non-community water
systems are required to sample for lOCs.
Non-purchased community water systems,
non-transient non-community water systems,
and transient non-community water systems
are all required to sample for nitrate and
nitrite.
All non-purchased community water systems
and non-transient non-community water
systems are required to sample for SOCs.
System Types Not Required to Sample
(sample data excluded from analyses)
All purchased systems and transient non-
community water systems are not required to
sample for lOCs.
All purchased systems are not required to
sample for nitrate and nitrite
All purchased systems and transient non-
community water systems are not required to
sample for SOCs.
10 The compliance monitoring requirements for non-public water systems differ from state to state. Therefore, for
consistency for the national occurrence analyses conducted for the second Six-Year Review, the data from all non-
public water systems were excluded from the Six-Year Review-ICR Dataset. Collectively, the non-public water
systems represent a very small fraction of the national population-served by public drinking water systems.
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Chemical Group
Volatile Organic
Chemicals
(VOCs)
Radiological
Contaminants
System Types Required to Sample
(sample data included in analyses)
All non-purchased community water systems
and non-transient non-community water
systems are required to sample for VOCs.
All non-purchased community water systems
are required to sample for the radionuclides.
System Types Not Required to Sample
(sample data excluded from analyses)
All purchased systems and transient non-
community water systems are not required to
sample for VOCs.
All purchased systems and non-purchased non-
transient non-community and non-purchased
transient non-community water systems are not
required to sample for radionuclides.
3.7 Missing System Inventory Data
For the Six-Year Review analysis, each system must have a single source water type and
population served designation to define each system in a unique source water type/population
size strata. Systems using both ground water and surface water, and systems using ground water
under direct influence of surface water (GWUDI), were considered surface water systems for
analysis. Systems with more than one specified value of their population served in the original
data were included using their most frequently occurring population served value.
Several state datasets were missing source water type and/or population served data
(California, Florida, South Dakota, Tennessee, and Texas). Other datasets did not include any
inventory information in their data submittal (Massachusetts, Michigan, and Wisconsin). For
missing system inventory data, the SDWIS/Fed database was accessed to obtain the correct
inventory data using the unique public water system identification number, or PWSID. The
SDWIS/Fed version accessed to obtain this inventory data was the third quarter of 2006. For
those systems whose inventory gaps could not be filled in by SDWIS/Fed, the 1998 Drinking
Water Needs Survey was consulted. Systems whose population and/or source water type data
could not be found were excluded from the Six-Year 2 analyses.
3.8 Adjustments of Population Served by Public Water Systems
All purchased systems (systems purchasing 100% of their water from other systems)
were excluded from the analyses since the compliance monitoring requirements for purchased
systems are generally different from those for non-purchased systems. However, by excluding
these systems, the population served by those systems would also be excluded from the
preliminary exposure estimates conducted for the Six-Year Review. Therefore, the population
served values of the purchased systems were linked to those systems they purchased from (the
"wholesale systems") and that were included in the occurrence and exposure analyses. To do
this, EPA compiled a list of all systems that sell water directly to the consumer ("retail systems")
and of all retail systems that purchase 100% their water. In the list, the purchased systems were
linked to the wholesale system from which they purchased water. The population served by each
purchased system was added to the population served by its wholesale system. The contaminant
occurrence measures that include these wholesale systems with their "adjusted" population
served values include the population served by the purchased systems.
A secondary adjustment was made to the wholesalers' total population served values to
address a known source of potential multiple counting of population possibly served by systems
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with contaminant occurrence. A total of 889 purchased systems actually purchase water from
more than one seller. There are no data available on the actual relative quantities of water
purchased from the different wholesalers. Therefore, in the cases of multiple wholesalers, the
population served by the purchasing system was assumed to be uniformly distributed across, and
therefore added to, each of the wholesaler systems. Populations served would otherwise be
counted multiple times if the entire population served of a purchased system is added to the
population served of each and every of its multiple wholesalers. To illustrate this simple uniform
distribution, consider a single large system serving a population of 60,300 that purchases 100%
of its water from three different systems. The compliance monitoring data from that purchasing
system is excluded from the occurrence analyses because it is a purchased system; however, one-
third of its population served (60,300 + 3 = 20,100) would be added to each of the three systems
from which it purchases water. This way, the population served values of purchased systems are
included in the analyses and considerations for the Six-Year Review.
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4 Data Quality Assurance/Quality Control
A significant effort was undertaken to ensure the quality of the data submitted for the
Six-Year Review. This QA/QC effort encountered a range of data quality across the different
contaminants and different states. Included below is a summary description of the QA/QC
measures that were conducted on the datasets submitted by the states before the analyses of those
state occurrence data were conducted. Not all QA/QC measures described were conducted on all
states, as noted below. For complete details of the data QA/QC measures, refer to Cadmus
(2008).
4.1 Review of Dataset Content
When submitted by the states, data dictionary files were reviewed for a definition of the
various data elements, field/row headings, codes, acronyms, etc. Data dictionaries were also used
to verify that all fields of data contained only the available codes listed by the state. Data
dictionaries were not required for data review of data from states that used the SDWIS Query
Extract Tool to extract their data. The following states that did not use the SDWIS Query Extract
Tool submitted data dictionaries with their datasets: California, Illinois (NTNCWS data only),
Maryland, and New Hampshire. The other non-SDWIS Query tool states did not submit a data
dictionary with their datasets, which necessitated extensive, often multiple, follow-up
communications with the state's data management staff. Most of these states were contacted with
questions regarding non-intuitive data element names, definitions of field headings, or non-
standard codes.
Field names were all standardized (e.g., changing "source" or "water type" to "source
water type") and data types were changed to similar formats (e.g., changing text fields to
numeric where appropriate and setting field lengths). Data reported for each field were also
standardized (e.g., in the "source water type" field, changed "SW" or "S" to "surface water").
4.2 Data Element Completeness
One of the first quality checks was to verify that all of the necessary data elements were
included in datasets submitted by the states. Many of the states not using the SDWIS Query
Extract Tool submitted datasets with more data elements than necessary. In those cases, it was
necessary to determine which data elements were needed for the Six-Year Review occurrence
analyses and which were not. Exhibit 4-1 provides a detailed list of the 17 data elements
requested by EPA for the Six-Year Review. EPA requested that, at a minimum, states provide
the nine data elements that are in bold and marked with an asterisk to enable dependable
occurrence analyses. Ideally, states submitted all 17 data elements with their occurrence data.
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Exhibit 4-1. Requested Data Elements
Data Element
Description
Inventory Data
Public Water System
* Identification Number
(PWSID)
System Name
Federal Public Water
System Type Code
Population served
Source Water Type
The code used to identify each PWS. The code begins with the standard 2-character
postal state abbreviation or Region code; the remaining 7 numbers are unique to each
PWS in the state.
Name of the PWS.
A code to identify whether a system is:
• Community Water System (CWS);
• Non-transient Non-community Water System (NTNCWS); or
• Transient Non-community Water System (TNCWS).
Highest average daily number of people served by a PWS, when in operation.
Type of water at the source. Source water type can be:
• Ground water (GW); or
• Surface water (SW); or
• Ground water under the direct influence of surface water (GWUDI).
Sample-Specific Information
* Sample Point
Identification Code
Sample Identification
Number
* Sample Collection Date
* Sample Purpose
* Sample Analysis Type
Code
* Contaminant
* Sample Analytical Result
-Sign
* Sample Analytical Result
-Value
* Sample Analytical Result
- Unit of Measure
A sampling point identifier established by the state, unique within each applicable
facility, for each applicable sampling location (e.g., entry point to the distribution
system). This information enables occurrence assessments that address intra-system
variability.
Identifier assigned by state or the laboratory that uniquely identifies a sample.
Date the sample is collected, including month, day, and year.
Indicates why the sample is being collected (e.g., compliance/routine, confirmation,
duplicate, repeat, special, special duplicate, etc.).
Code for type of water sample collected.
• Raw (Untreated) water sample
• Finished (Treated) water sample
For lead and copper only:
• Source
• Tap
For Total Coliform Rule (TCR) Repeats only; indicator of sampling location relative to
sample point where positive sample was originally collected:
• Upstream
• Downstream
• Original
Contaminant name, 4-digit SDWIS contaminant identification number, or Chemical
Abstracts Service (CAS) Registry Number for which the sample is being analyzed.
The sign indicates whether the sample analytical result was:
• (<) "less than" means the contaminant was not detected or was detected at a level
"less than" the MRL.
• (=) "equal to" means the contaminant was detected at a level "equal to" the value
reported in "Sample Analytical Result - Value."
(Not required for Total Coliform Rule (TCR) data)
Actual numeric decimal value of the analysis for the chemical results, or the MRL if
the analytical result is less than the contaminant's MRL.
For the TCR, results will indicate presence/absence. For Lead and Copper Rule
(LCR), value requested is the 90th percentile tap water monitoring result.
Unit of measurement for the analytical results reported (usually expressed in either
ug/L or mg/L for chemicals; or pCi/L or mrem/yr for radionuclides).
(Not required for TCR data)
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Data Element
Sample Analytical Method
Number
Minimum Reporting Level
(MRL)- Value
MRL - Unit of Measure
Description
EPA identification number of the analytical method used to analyze the sample for a
given contaminant.
MRL refers to the lowest concentration of an analyte that may be reported.
(Not required forTCR data)
Unit of measure to express the concentration value of a contaminant's MRL.
(Not required forTCR data)
EPA requested compliance monitoring information for chemical contaminants regulated
under Phase I, II, lib, and V Rules; the Arsenic Rule; and the Radionuclides Rule. EPA also
requested data for lead, copper, acrylamide, and epichlorohydrin. Lead and copper occurrence
data were not analyzed as part of this second Six-Year Review because occurrence analyses are
being conducted as part of other ongoing EPA reviews specific to lead and copper. Although
acrylamide and epichlorohydrin are regulated contaminants and are included in the second Six-
Year Review process, there are currently no acceptable laboratory analytical methods for
detecting acrylamide or epichlorohydrin in drinking water.11 Therefore, given very limited
monitoring data that are neither complete nor representative, no occurrence analyses were
conducted for acrylamide or epichlorohydrin.
EPA also requested data for total coliforms, fecal coliforms, and Escherichia coli (E.
coli); similarly, these data are being assessed separately under the current Total Coliform Rule
(TCR) development and were not assessed here as part of the second Six-Year Review. Exhibit
4-2, below, lists the specific contaminants for which EPA requested monitoring data. It was
necessary to confirm that all of the requested contaminants were included in each state dataset.
When a state was missing data for a contaminant, the state was contacted to identify the reason
for the omission, such as a statewide waiver for the contaminant(s).
Exhibit 4-2. List of Contaminants for Which Data Were Requested from States
Chemical Contaminants (Phase 1, II, MB, and V Rules; Arsenic Rule; Lead and Copper Rule)
Acrylamide
Alachlor
Antimony
Arsenic
Asbestos
Atrazine
Barium
Benzene
1,2-Dichloroethane
(Ethylene dichloride)
1,1-Dichloroethylene
cis-1 ,2-Dichloroethylene
trans-1 ,2-Dichloroethylene
Dichloromethane (Methylene chloride)
1 ,2-Dichloropropane
Di(2-ethylhexyl)adipate (DEHA)
Di(2-ethylhexyl)phthalate (DEHP)
Lindane (gamma-
Hexachlorocyclohexane)
Mercury (Inorganic)
Methoxychlor
Nitrate (as N)
Nitrite (as N)
Oxamyl (Vydate)
Pentachlorophenol
Picloram
11 Both acrylamide and epichlorohydrin are sometimes used in drinking water treatment processes. In lieu of an
MCL and compliance monitoring that enables assessments of occurrence relative to an MCL, each water system
must certify, in writing, to the state, using third-party or manufacturer's certification, that when acrylamide and
epichlorohydrin are used in drinking water systems, the combination, or product of dose and monomer level does
not exceed the levels specified, as follows: acrylamide = 0.05% dosed at 1 mg/L and epichlorohydrin = 0.01% dosed
at 20 mg/L.
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Chemical Contaminants (Phase 1, II, MB, and V Rules; Arsenic Rule; Lead and Copper Rule)
Benzo[a]pyrene
Beryllium
Cadmium
Carbofuran
Carbon tetrachloride
Chlordane
Monochlorobenzene
Chromium (Total)
Copper
Cyanide
2,4-Dichlorophenoxyacetic acid
(2,4-D)
Dalapon
1 ,2-Dibromo-3-chloropropane (DBCP)
1,2-Dichlorobenzene
(o-Dichlorobenzene)
1,4-Dichlorobenzene
(p-Dichlorobenzene)
Dinoseb
2,3,7,8-TCDD (Dioxin)
Diquat
Endothall
Endrin
Epichlorohydrin
Ethylbenzene
Ethylene dibromide (EDB)
Fluoride
Glyphosate
Heptachlor
Heptachlor epoxide
Hexachlorobenzene
Hexachlorocyclopentadiene
Lead
Polychlorinated biphenyls (PCBs)
Selenium
Simazine
Styrene
Tetrachloroethylene (PCE)
Thallium
Toluene
Toxaphene
2,4,5-Trichlorophenoxypropionic
Acid (Silvex)
1 ,2,4-Trichlorobenzene
1,1,1 -Trichloroethane
1 ,1 ,2-Trichloroethane
Trichloroethylene (TCE)
Vinyl chloride
Xylenes (Total)
Radiological Contaminants
Combined Radium-226/228; and
Radium-226 & Radium-228 (if
available)
Alpha particles
Beta particles
lodine-131
Strontium-90
Tritium
Uranium
Microbiological Contaminants
Total coliforms ||Fecal coliforms ||Esc/7e/7'c/?/a coli (E. coli)
The date range of each state's compliance monitoring sample collection was also
reviewed to determine if all of the requested years of data were included. Any data not collected
between 1998 and 2005 were removed from the working datasets. Some states were not able to
submit all requested years of data because they only began storing their data electronically
sometime after 1998 (e.g., Arkansas, Connecticut, Delaware, and Hawaii). Some states alerted
EPA of this issue when they submitted their data; other states had to be contacted to confirm that
the missing years of data were not available electronically. In addition, any records from
obviously incorrect sample dates (e.g., data from year "1900") were removed.
4.3
Potential Outliers and Incorrect Units
To address the data management steps described above, for example, obviously incorrect
sample dates, it was seldom necessary to discuss the corrections with state data management
staff. However, to resolve data quality issues that required significant corrections to the raw data,
such as identifying and deleting outliers or identifying and changing incorrect units, state data
management staff were consulted when appropriate before any data corrections were completed.
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For each state and contaminant, EPA conducted a review for possible outliers or units
problems by calculating basic summary statistics, such as the minimum, median and maximum
of detections and non-detections. Summary statistics for each contaminant were compared across
states to check for reasonableness and general consistency regarding range of values. The
distributions of all detection and non-detection values were also compiled and ranked to facilitate
assessment. Generally, there should be a smooth, continuous distribution of the actual quantified
concentrations of contaminants detected and a somewhat step-wise distribution of non-detections
reflecting the different concentrations marking the different analytical methods' reporting levels.
Any detected values that are, for example, a thousand-fold lower than most other low detection
values likely reflect an analytical unit conversion problem (mg/L versus |ig/L) in the original raw
data. Furthermore, all detection values that were less than one-tenth the MDL were flagged and
investigated as potential outliers. All detections with values greater than 10 times the MCL
concentration were also flagged and investigated as potential outliers or units problems. In
addition, these records were compared to MCL violation records contained in the SDWIS/Fed
database.
The water source type (i.e., raw or finished) of each outlier was also investigated. In
some states, systems are allowed to monitor at source (raw) water sampling points. If a
contaminant is detected in a source water sample, the system is required to collect a follow-up
sample at the entry point to the distribution system, unless there was no treatment. If an outlier
was from raw water and it had a corresponding finished water sample (i.e., a finished water
sample from the same or next day), then the raw water outlier was removed from the dataset. If
there was no corresponding finished water sample and the sample was marked as a compliance
sample, then the raw water outlier was usually retained in the dataset, unless there was further
evidence to remove the record. Some states stored raw water non-compliance samples along with
finished water samples; those non-compliance samples were removed from the dataset.
About 30 states were contacted about apparently incorrect units of measure for particular
contaminants. Note that states were contacted even when only a small number of records were in
what appeared to be incorrect units. For example, asbestos data are typically expressed in million
fibers per liter (MFL). However, a small portion of asbestos data in numerous state datasets were
expressed in mg/L. In all cases, the states verified that there was a data entry error in the unit of
measure field and the data should have been reported in MFL. Similarly, alpha particles and
combined radium data are typically expressed in pCi/L. State data management staff were
contacted when alpha particles and/or combined radium data were listed in the database in mg/L
or ng/L. Again, in most cases, states verified that there had been a data entry error and the data
were indeed in pCi/L.
The apparent very high or very low detections records (i.e., potential outliers) comprised
less than 0.5% of total detections. Forty-two of the 45 state datasets contained potential outliers
in their chemical or radionuclide data. Less than 0.5% of the total number of analytical results
was identified as having been recorded in the incorrect units. Less than 0.06% of the analytical
detections were changed to non-detections after investigation. Of the total number of records
excluded from analysis, less than 0.04% of the total number of analytical results were removed
as suspected or confirmed outliers. Less than 3% of the total number of records compiled were
removed for other reasons including: records were not for compliance (i.e., records from
transient non-community water systems for chemicals other than nitrate and nitrite), records
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were for "special" or "investigation" studies, or records were raw water/non-compliance samples
or further communications with states suggested records were not dependable or were probable
data entry errors.
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5 Summary of the Compliance Monitoring Data
This section provides an overview of the data that were received, passed the QA/QC
process, and were analyzed for second Six-Year Review. Also provided is information on the
total number of systems in the final Six-Year Review-ICR dataset, characteristics of the systems
such as system types, source water types, population served, the number of records from each
state, and the number of records for each contaminant. An assessment of contaminant occurrence
variability over the eight years was also conducted.
5.1 Characteristics of the Data - States, Systems and Records
Exhibit 5-1 shows the number and percent of systems and population served by systems
according to source water type in the Six-Year Review-ICR Dataset. Exhibit 5-2 shows the
number and percent of systems and population served by systems according to source water type
and system size. Source water types are stratified by all classifications, and summaries of GW
and SW groupings are also presented. For analysis of these data, EPA followed its standard
practice of treating GWUDI as surface water.
Exhibit 5-1. Number of Systems and Population Served by Systems in the
Six-Year Review-ICR Dataset, by Source Water Type
Source Water Type
Ground Water (GW)
Ground Water Under the Direct
Influence of Surface Water (GWUDI)
Surface Water (SW)
Total
Systems
Number
126,079
759
4,712
131,550
Percent of Total
95.8%
0.6%
3.6%
100.0%
Population Served
Number
100,095,915
2,294,688
151,403,808
253,794,411
Percent of Total
39.4%
0.9%
59.7%
100.0%
Exhibit 5-2. Number of Systems and Population Served by Systems in the
Six-Year Review-ICR Dataset, by System Size
System Size
(Population
Served by the
System)
<50
50-100
101 -500
501 -1,000
Ground Water (GW)
Number of
Systems
43,465
32,778
33,927
6,606
Population
Served by
Systems
1,233,869
2,398,181
7,923,786
4,835,018
Surface Water (SW)
Number of
Systems
488
456
958
368
Population
Served by
Systems
13,349
33,810
49,671
281,406
Total
Number of
Systems
43,953
33,234
34,885
6,974
Population
Served by
Systems
1,247,218
2,431,991
8,173,457
5,116,424
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System Size
(Population
Served by the
System)
1,001 -3,300
3,301 -10,000
10,001 -50,000
50,001 -100,000
100,001 -1 million
> 1 million
Total
Ground Water (GW)
Number of
Systems
5,363
2,440
1,239
176
83
2
126,079
Population
Served by
Systems
9,785,319
13,919,445
26,598,895
11,885,651
17,866,469
3,649,282
100,095,915
Surface Water (SW)
Number of
Systems
848
900
962
227
244
20
5,471
Population
Served by
Systems
1,722,092
5,601,547
22,503,031
15,707,058
63,627,821
43,958,711
153,698,496
Total
Number of
Systems
6,211
3,340
2,201
403
327
22
131,550
Population
Served by
Systems
11,507,411
19,520,992
49,101,926
27,592,709
81,494,290
47,607,993
253,794,411
Exhibit 5-3 shows the number and percent of systems in the Six-Year Review-ICR
dataset by system type. Although almost 60% of the systems are transient water systems, more
than 90% of the population is served by CWSs. Only a small fraction of transient systems
collected data for most of the Six-Year contaminants, as transient systems are only required to
collect nitrate and nitrite samples.
Exhibit 5-3. Number of Systems and Population Served by Systems in the
Six-Year Review-ICR Dataset, by System Type
System Type
Community Water System
(CWS)
Non-Transient Non-Community
Water System (NTNCWS)
Transient Non-Community
Water System (TNCWS)1
Unknown2
Total
Systems
Number
37,214
18,321
75,701
314
131,550
Percent of Total
28.3%
13.9%
57.5%
0.2%
100.0%
Population Served
Number
238,001,491
5,330,069
10,439,519
23,332
253,794,411
Percent of Total
93.8%
2.1%
4.1%
0.0%
100.0%
1. Only the nitrate/nitrite regulations require compliance monitoring by these transient systems; thus, data from the
transient systems were included only for the nitrate and nitrite occurrence analyses and were excluded for all
occurrence analyses for lOCs, SOCs, VOCs, and radiological contaminants.
2. Systems with unknown system type were included in the second Six-Year Review analyses. None of the
occurrence analyses conducted for the second Six-Year Review required specifying the system type.
Exhibit 5-4 lists the total number of records, systems and population served by systems in
each of the 47 state/tribal datasets used in the second Six-Year Review analyses. In addition, the
last column of the table lists any contaminant(s) for which the state did not provide data.
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Exhibit 5-4. An Inventory of Contaminant Occurrence Data in
the Six-Year Review-ICR Dataset, by State
State
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kentucky
Maine
Maryland
Massachusetts
Michigan
Minnesota
Missouri
Montana
Nebraska
Nevada
New Hampshire
Number of
Records for
Regulated
Contaminants
76,160
97,245
562,499
136,204
3,119,746
200,141
243,589
64,598
213,208
236,424
89,664
196,392
338,647
255,992
116,123
151,467
167,518
302,133
487,119
648,331
462,853
422,324
208,602
280,012
154,959
376,523
Number of
Systems with
Data for
Regulated
Contaminants
425
1,477
1,663
456
7,605
1,748
2,918
580
6,261
1,931
116
1,955
3,957
5,338
1,899
298
2,257
4,105
1,697
14,521
9,408
2,691
1,014
792
577
2,643
Population
Served by
Systems with
Data for
Regulated
Contaminants
4,741,994
712,666
6,292,843
2,453,733
38,646,890
5,259,232
2,787,413
778,333
18,939,279
7,500,353
1,310,187
1,206,368
9,630,392
5,492,975
2,653,189
4,619,135
950,371
5,279,878
8,738,481
8,850,281
4,898,639
4,976,894
786,930
1,469,627
998,101
1,282,866
Did not submit useable data for
the following regulated contaminants:
Uranium
Nitrate; Nitrite; Asbestos; Dioxin; 1,4-
Dichlorobenzene; Alpha Particles; Uranium;
Combined Radium-226/228
Alpha Particles
Dioxin; Alpha Particles; Uranium
Combined Radium-226/228; Beta Particles
Alpha Particles; Uranium; Beta Particles
Asbestos; Dalapon; Diquat; Endothall; Di(2-
ethylhexyl)adipate; Di(2-
ethylhexyl)phthalate; Picloram; Dinoseb;
Dioxin; 2,4-D; Silvex; Benzo[a]pyrene;
Pentachlorophenol; cis-1,2-
Dichloroethylene; PCBs; Xylenes (Total);
trans-1 ,2-Dichloroethylene;
Monochlorobenzene; Alpha Particles;
Uranium; Combined Radium-226/228; Beta
Particles
Dioxin; Alpha Particles
Uranium
Dioxin
Uranium
Dioxin; Beta Particles
Ethylene dibromide
PCBs; Alpha Particles; Combined Radium-
226/228
Asbestos; Dioxin; PCBs; Uranium;
Combined Radium-226/228; Beta Particles
Asbestos; Diquat; Endothall; Dioxin; PCBs;
Combined Radium-226/228
Asbestos; Diquat; Endothall; Glyphosate;
Dioxin; PCBs
PCBs; Beta Particles
Dalapon; Diquat; Endothall; Dioxin; PCBs;
Alpha Particles; Uranium; Combined
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State
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Rhode Island
South Carolina
South Dakota
Tennessee 1
Texas
Utah
Vermont
Virginia
West Virginia
Wisconsin
Wyoming
Total
Number of
Records for
Regulated
Contaminants
602,842
302,188
297,902
944,007
23,272
353,781
125,218
140,912
85,834
228,336
52,155
93,045
1,186,434
478,540
159,271
153,870
59,916
439,365
86,661
15,450,283
Number of
Systems with
Data for
Regulated
Contaminants
4,221
885
6,677
6,559
218
5,078
1,036
2,672
470
1,650
432
369
6,453
999
1,317
1,820
1,123
7,013
636
127,960
Population
Served by
Systems with
Data for
Regulated
Contaminants
8,258,339
1,735,210
14,827,610
7,351,966
563,112
10,691,928
3,173,290
3,182,082
968,684
3,777,736
676,911
5,686,766
25,418,822
2,638,287
596,375
6,245,276
1,503,712
4,418,338
521,508
253,794,411
Did not submit useable data for
the following regulated contaminants:
Radium-226/228; Beta Particles
Dioxin; PCBs
Diquat; Endothall; Glyphosate
Beta Particles
Asbestos; Endrin; Lindane; Methoxychlor;
Toxaphene; Dalapon; Diquat; Endothall;
Di(2-ethylhexyl)adipate; Simazine; Di(2-
ethylhexyl)phthalate; Picloram; Dinoseb;
Hexachlorocyclopentadiene; Atrazine;
Alachlor; Dioxin; Heptachlor; Heptachlor
Epoxide; 2,4-D; Silvex;
Hexachlorobenzene; Benzo[a]pyrene;
Pentachlorophenol; PCBs; DBCP; Ethylene
dibromide; Chlordane; Alpha Particles;
Uranium; Combined Radium-226/228; Beta
Particles
Dioxin; PCBs
Cyanide; Dioxin; PCBs; Beta Particles
Dioxin
Uranium; Combined Radium-226/228; Beta
Particles
Asbestos; Diquat; Endothall; Glyphosate;
Dioxin
Uranium
Dioxin
Dioxin
Di(2-ethylhexyl)phthalate; Alpha Particles
1. Tennessee submitted data from a total of 807 PWSs. Data from 392 of these systems, with an associated
population served of 73,512, were inadvertently excluded from the Six-Year Review analyses and the error was not
discovered until after all analyses had been conducted. Only 38 of these systems, with an associated population
served of 14,771, were non-purchased community or non-transient non-community water systems that would have
been analyzed as part of the second Six-Year Review, with the exception of nitrate and nitrite. The omission of this
small number of systems (0.03% of the national total) has very little effect on the national occurrence estimates
generated with the Six-Year Review-ICR dataset. Contaminant occurrence rates were generated for the omitted
systems (e.g., percent of sample detections and percent of systems with at least one detection) and the occurrence
rates for the omitted PWSs were very similar to the overall national rates. Of the omitted Tennessee systems,
approximately 390 and 190 were non-purchased water systems (CWSs, NTNCWSs, and TNCWSs) that provided
nitrate and nitrite data, respectively. Nitrate and nitrite occurrence rates were generated for the omitted systems and
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the occurrence rates for the omitted PWSs were, again, very similar to, and often less than, the overall national rates
of nitrate and nitrite occurrence.
Exhibit 5-5 summarizes the Six-Year Review-ICR Data by contaminant. For each
contaminant, this table includes MCL concentration values, the number of states with data, total
number of records, systems, and the population served by systems that have data represented in
the Six-Year Review-ICR Dataset. Also presented are the modal MRL values for each
contaminant, derived as the mode of state modal MRLs. See Section 3.3 for details regarding
modal MRL values.
Exhibit 5-5. An Inventory of the Contaminant Occurrence Data
the Six-Year Review-ICR Dataset, by Contaminant
in
Contaminant
(MCL Concentration)
Number
of States
with Data
Total
Number of
Records
Total
Number of
Systems
Total
Population
Served by
Systems
MRL
Inorganic Chemicals
Antimony
(0.006 mg/L)
Arsenic n
(0.05 mg/L)
Asbestos
(7 MFL)
Barium
(2 mg/L)
Beryllium
(0.004 mg/L)
Cadmium
(0.005 mg/L)
Chromium (Total)
(0.1 mg/L)
Cyanide
(0.2 mg/L)
Fluoride
(4 mg/L)
Mercury (Inorganic)
(0.002 mg/L)
Nitrate (as N)
(10 mg/L)
Nitrite (as N)
(1 mg/L)
Selenium
(0.05 mg/L)
Thallium
(0.002 mg/L)
45
45
38
45
45
45
45
44
45
45
44
44
45
45
185,986
224,035
18,181
183,118
183,575
181,667
185,952
120,368
333,211
181,629
1,052,487
397,175
181,684
185,047
49,016
49,473
8,278
49,125
48,021
48,920
48,908
32,067
48,600
48,859
119,537
86,313
48,925
48,925
223,251,662
230,393,228
85,161,934
229,775,707
221,383,819
229,685,370
229,628,430
162,458,600
233,569,199
229,853,379
229,508,036
207,984,813
229,863,411
223,324,845
0.001 mg/L
0.005 mg/L
0.2 MFL
0.1 mg/L
0.001 mg/L
0.001 mg/L
0.01 mg/L
0.005 mg/L
0.1 mg/L
0.0002 mg/L
0.1 mg/L
0.1 mg/L
0.005 mg/L
0.0005 mg/L
Synthetic Organic Chemicals 2
Alachlor
(2 M9/L)
Atrazine
(3 ug/L)
Benzo(a)pyrene
(0.2 ug/L)
44
44
43
155,989
161,690
119,871
36,845
37,215
28,578
197,311,966
200,372,590
184,144,163
0.2 ug/L
0.1 ug/L
0.02 ug/L
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Contaminant
(MCL Concentration)
Carbofuran
(40 Mg/L)
Chlordane
(2 Mg/L)
Dalapon
(200 |jg/L)
Di(2-ethylhexyl)adipate (DEHA)
(400 |jg/L)
Di(2-ethylhexyl)phthalate (DEHP)
(6 Mg/L)
1 ,2-Dibromo-3-chloropropane
(DBCP) (0.2 |jg/L)
2,4-Dichlorophenoxyacetic acid
(70 Mg/L)
Dinoseb
(7 Mg/L)
Diquat
(20 Mg/L)
Endothall
(100|jg/L)
Endrin
(2 Mg/L)
Ethylene Dibromide (EDB)
(0.05 Mg/L)
Glyphosate
(700 Mg/L)
Heptachlor
(0.4 Mg/L)
Heptachlor Epoxide
(0.2 Mg/L)
Hexachlorobenzene
d Mg/L)
Hexachlorocyclopentadiene
(50 Mg/L)
Lindane (gamma-
Hexachlorocyclohexane) (0.2 Mg/L)
Methoxychlor
(40 Mg/L)
Oxamyl (Vydate)
(200 Mg/L)
Pentachlorophenol
d Mg/L)
Picloram
(500 Mg/L)
Polychlorinated biphenyls (PCBs)
(0.5 Mg/L)
Simazine
(4 Mg/L)
Toxaphene
(3 Mg/L)
2,3,7,8-TCDD (Dioxin)
(0.00003 Mg/L)
2,4,5-Trichlorophenoxypropionic
Acid (Silvex) (50 Mg/L)
Number
of States
with Data
45
44
42
43
42
44
43
43
38
38
44
43
42
44
44
44
44
44
44
45
43
43
34
44
44
27
43
Total
Number of
Records
114,142
128,453
112,423
121,792
120,846
231,169
124,285
121,896
55,634
49,820
134,336
218,797
58,174
133,726
134,708
135,512
135,290
135,585
137,068
113,380
136,475
121,920
67,216
158,256
115,403
11,076
122,713
Total
Number of
Systems
31,097
31,841
28,387
28,902
27,667
37,618
33,187
32,713
15,595
14,156
32,783
36,215
16,351
33,020
33,015
32,826
32,801
33,265
33,421
30,876
34,339
32,910
18,393
36,830
30,387
2,383
32,887
Total
Population
Served by
Systems
167,973,342
182,036,975
178,186,111
184,134,674
179,948,572
193,749,339
187,451,183
182,919,390
120,622,647
118,536,801
184,043,162
188,153,915
116,276,011
184,443,784
184,477,775
184,124,823
184,738,430
187,258,935
187,636,119
167,378,431
190,507,709
186,386,430
124,114,208
196,986,505
160,012,134
52,854,445
183,000,768
MRL
0.9 Mg/L
0.2 Mg/L
1 Mg/L
0.02 Mg/L
0.6 Mg/L
0.6 Mg/L
0.1 Mg/L
0.2 Mg/L
2 Mg/L
9 Mg/L
0.01 Mg/L
0.01 Mg/L
6 Mg/L
0.04 Mg/L
0.02 Mg/L
0.1 Mg/L
0.1 Mg/L
0.02 Mg/L
0.1 Mg/L
2 Mg/L
0.04 Mg/L
0.1 Mg/L
0.1 Mg/L
0.07 Mg/L
iug/i-
o.000005 Mg/L
0.2 Mg/L
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Contaminant
(MCL Concentration)
Number
of States
with Data
Total
Number of
Records
Total
Number of
Systems
Total
Population
Served by
Systems
MRL
Volatile Organic Chemicals
Benzene
(5 Mg/L)
Carbon Tetrachloride
(5 Mg/L)
1,2-Dichlorobenzene
(600 |jg/L)
1,4-Dichlorobenzene
(75 Mg/L)
1,2-Dichloroethane
(5 Mg/L)
1,1-Dichloroethylene
(7 Mg/L)
cis-1 ,2-Dichloroethylene
(70 Mg/L)
trans-1 ,2-Dichloroethylene
(100|jg/L)
Dichloromethane (Methylene
Chloride) (5 |jg/L)
1,2-Dichloropropane
(5 Mg/L)
Ethylbenzene
(700 |jg/L)
Monochlorobenzene
(100|jg/L)
Styrene
(100|jg/L)
Tetrachloroethylene (PCE)
(5 Mg/L)
Toluene
(1,000|jg/L)
1 ,2,4-Trichlorobenzene
(70 Mg/L)
1,1,1-Trichloroethane
(200 |jg/L)
1,1,2-Trichloroethane
(5 Mg/L)
Trichloroethylene (TCE)
(5 Mg/L)
Vinyl Chloride
(2 Mg/L)
Xylenes (Total)
(10,000 Mg/L)
45
45
45
44
45
45
44
44
45
45
45
44
45
45
45
45
45
45
45
45
44
374,503
385,864
372,946
370,698
375,636
378,630
373,316
371,258
372,009
374,409
374,141
370,519
372,269
410,042
374,250
371,132
374,950
372,386
403,609
373,161
363,466
50,435
50,446
50,422
49,969
50,442
50,425
50,314
50,319
50,169
50,437
50,447
50,311
50,421
50,436
50,451
50,135
50,440
50,195
50,432
50,411
47,698
226,947,293
226,934,787
226,929,816
224,476,625
226,933,991
226,909,664
225,615,734
225,611,137
226,844,060
226,912,134
226,939,375
225,627,782
226,933,636
227,008,555
226,955,301
226,842,102
226,931,546
226,851,469
226,907,686
226,464,423
218,071,535
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
0.5 Mg/L
Radiological Contaminants
Alpha Particles
(15pCi/L)
Beta Particles
(screening level = 50 pCi/L)3
Combined Radium-226 & -228
(original Radionuclides rule)
(5pCi/L)4
35
34
35
73,002
59,983
18,452
18,653
14,231
6,884
121,170,400
120,274,924
47,422,440
1 pCi/L
4 pCi/L
1 pCi/L
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Contaminant
(MCL Concentration)
Combined Radium-226 & -228
(revised Radionuclides rule)
(5pCi/L)4
Uranium
(30 ug/L)
Number
of States
with Data
33
33
Total
Number of
Records
18,050
41,581
Total
Number of
Systems
3,893
5,921
Total
Population
Served by
Systems
41,426,437
70,631,392
MRL
1 pCi/L
0.001 ug/L
1. The MCL concentration for arsenic is currently 0.01 mg/L. The Six-Year data were analyzed relative to the former
MCL concentration of 0.05 mg/L because that was the MCL during the period of review for the Six-Year 2 analysis,
1998 through 2005. However, additional analyses relative to the new arsenic MCL concentration are included in
Appendix A.
2. The reduced number of systems sampling for SOC data, as compared to lOCs and VOCs, likely relates to state
waivers for pesticides and herbicides.
3. Although the MCL for beta particles, 4 millirem per year (mrem/yr), is in the unit of measure of mrem/yr, the primary
unit of analytical measure is picocuries per liter (pCi/L). This unit of measure relates to screening thresholds of 15
pCi/L and 50 pCi/L that are defined in the 2000 Radionuclides Rule. More than 95% of all compliance monitoring data
for beta particles submitted by the states to EPA were in units of pCi/L. The analyses presented here are based on
compliance monitoring data represented in units of pCi/L and are conducted relative to the screening threshold of 50
pCi/L.
4. The revised Radionuclides Rule, published in 2000, went into effect on December 8, 2003 so combined radium-
226 and -228 occurrence data collected before December 8, 2003 were analyzed and are presented in the row
labeled "original Radionuclides rule" and data collected after December 8, 2003 were analyzed and are presented in
the row labeled "revised Radionuclides rule."
5.2 Occurrence Variability Assessment
For the second Six-Year Review, EPA collected and analyzed eight years of compliance
monitoring data, 1998 through 2005. The eight years of data were used to develop aggregate
measures of occurrence (i.e., a single measure of occurrence that is based on all eight years of
data). For example, a typical measure is the percent of systems with at least one detection of a
particular contaminant greater than its MCL concentration. This single measure would reflect a
count of each and every unique system with at least one detection in any of the eight years
considered and then present a single percentage of systems with at least one detection.
Recognizing that occurrence of a particular contaminant might vary over an eight-year period,
EPA conducted assessments to determine if the compliance monitoring data in the Second Six-
Year Review-ICR dataset exhibit significant variability over time.
To make these assessments, it was not possible to simply evaluate yearly sample
detection rates for each contaminant at the national level. Monitoring schedules for a particular
contaminant can differ from system-to-system and year-to-year (e.g., not all surface water
systems monitor all contaminants quarterly). Therefore, a national comparison of system
monitoring data from different years will typically be a comparison of data from different subsets
of systems nationally. The variation in compliance monitoring schedules generally corresponds
to the assessed chance of contaminant occurrence based on historic monitoring results at each
system. If a contaminant is shown not to occur at a system through a specified period of routine
compliance monitoring, that system is authorized to conduct a reduced monitoring schedule for
that contaminant. Some systems monitor contaminants as infrequently as once every year, every
three years, or even every nine years. Because of this variability in monitoring schedules and its
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implications (i.e., the frequency and timing of sampling are not random), a simple year-to-year
assessment of occurrence across all systems does not provide a clear, unambiguous assessment
of occurrence variability.
To evaluate that the observed variability in the occurrence measures are due to changes in
contaminant occurrence rather than differences or changes in monitoring schedules, EPA
identified systems that collected at least one sample in the 1998-2001 period of data and at least
one sample in the 2002-2005 period. This enabled a comparison of occurrence based on a more
consistent set of systems. EPA then quantified contaminant occurrence at the system level in the
first four years and in the second four years, and used standard statistical t-tests to determine
whether system level occurrence in the first four years was significantly different from system
level occurrence in the second four years.
There is no single "correct" measure of occurrence for assessing variability. Contaminant
occurrence variability can be based on a number of different measures such as contaminant
detection rates, concentration averages, or the frequency at which systems find a contaminant
above some concentration threshold. Occurrence also is defined by a relatively small number of
samples from each system, as expected given compliance monitoring requirements. Given these
factors, the variability assessments are subject to some uncertainty and results varied depending
on the specific measures employed, such as detection rates, concentration averages, etc. The
results also depended on which systems were included in the assessment. One group of
assessments included only systems with at least one sample in each of the eight years of data
while the second group of assessments included only systems with at least one annual sample
during 1998-2001 and another during 2002-2005.
EPA conducted six different time-dependent variability assessments, comparing
measures of detection rates, concentration averages, and exceedance rates for the two different
groups of systems described above. Findings of variability are based on the collective results of
these six assessments. For 62 of the 69 contaminants assessed, there is no statistically significant
variability in occurrence between the 1998-2001 and 2002-2005 time periods, regardless of the
specific occurrence measure assessed. For the other seven contaminants, at least one occurrence
measure for each of the contaminants was statistically found to be different in the two time
17
periods. Most of the contaminants with occurrence variability over time had a decrease in
occurrence over the eight-year period including thallium in SW, 1,1,1-trichloroethane in GW ,
and dichloromethane, 1,2-dichloroethane, and carbon tetrachloride in GW and SW. Showing an
increase in occurrence over the eight-year period was fluoride in GW and
hexachlorocyclopentadiene in SW. Since multiple measures of occurrence were assessed, it is
difficult to define an actual quantitative amount of decrease or increase for these seven
contaminants over the eight-year period. Generally, these findings indicate that it is appropriate
12 Variability of occurrence over time was determined using t-tests to measure whether or not there was a
statistically significant difference between occurrence measures from the two time periods. Statistical significance
was determined by the use of standard t-tests which compare two sets of values, such as estimated average detection
rates, and calculates the probability that the mean value or central tendency, of the first set of data is the same as the
mean value of the second set of values. If this calculated probability is low (<5% is a common defining threshold),
then the conclusion is that the central tendency of the first set of values is "significantly" different from the central
tendency of the second set. The t-tests used means, variances, and sample sizes to determine whether the likelihood
of the null hypothesis which is that the data were not significantly different, was less than 5% (i.e., a p-value less
than 0.05).
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to use an aggregation of the eight years of data for the occurrence estimates for the second Six-
Year Review. For the nine contaminants with at least some statistically significant measure of
increasing or decreasing occurrence, these findings are most appropriately used as context or
background for the quantitative occurrence findings presented in Sections 6 and 7 of this report.
5.3 Threshold Evaluations
EPA assessed the occurrence of the regulated contaminants relative to several different
thresholds or concentration values. Stage 1 and Stage 2 assessments of occurrence were made
relative to the MRL, identifying the simple presence/absence of a detection of a contaminant. A
sample analytical result is defined as a "detection" if the quantified sample concentration of the
contaminant is equal to or greater than that contaminant's MRL.
Contaminant occurrence was also evaluated relative to higher contaminant concentration
thresholds including a contaminant's MCL concentration. For Stage 1 and Stage 2 analyses
relative to an MCL concentration, the criterion is for any analytical results to exceed the
concentration value of a specific contaminant's MCL. The Stage 1 analyses would identify any
single result greater than the MCL concentration and the Stage 2 analyses would identify system
estimated long-term (multi-year) average concentrations greater than the MCL concentration.
The analyses conducted here, though, are not equivalent to the analyses conducted to
estimate a potential MCL violation. Both these Stage 1 and Stage 2 analyses are based on every
analytical sample result from all years with data in the Six Year Review-ICR Dataset. The Stage
2 analysis (based on an estimated long-term average concentration) is similar to the calculation
conducted to determine an MCL violation, but the two calculations are different. For most
regulated drinking water contaminants, an MCL violation occurs when the concentration equal to
a contaminant's MCL is exceeded by the estimated annual average concentration based on a
limited number of consecutive quarterly compliance monitoring samples (typically four for
surface water systems and two for ground water systems).13 In contrast, a "Stage 2 MCL
exceedance" occurs when the concentration threshold equal to a particular contaminant's MCL is
exceeded by the estimated system average concentration based on multiple years (not two or four
consecutive quarters) of compliance monitoring samples. Calculations of MCL violations are not
conducted in this report.
13 For nitrate and nitrite, if a single sample result is greater than or equal to the MCL, the system must collect a
confirmation sample and average it with the original sample. If that average is greater than the MCL, then an MCL
violation has occurred.
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6 Stage 1 Analysis
The Stage 1 statistical analysis of the second Six-Year Review-ICR dataset consists of
simple counts and descriptive statistics of the occurrence data for each of the regulated
contaminants assessed. National contaminant occurrence estimates are conducted relative to
contaminant MRLs and MCL concentrations and are presented by systems and population served
by systems in Section 6.1. A comparison of the summary Stage 1 analysis results from the first
Six-Year Review with data from 1993-1997 and the current Six-Year Review with data from
1998-2005, is presented in Section 6.2. A supplemental measure of occurrence, based on
occurrence at sample point locations within each system, using the 1998-2005 data is described
in Section 6.3 with summary sample point estimates presented in Exhibit 6-3.
Also included in Appendix A are additional occurrence measures conducted for samples,
systems, and population served by systems. These additional occurrence findings are presented
by state and for the nation as a whole. For the sample occurrence assessments, occurrence
measures include the number and percent of samples for each contaminant with analytical
detections; and the minimum, median, maximum, and 90* percentile values of those detections.
System-level occurrence measures include the number and percent of systems with one or more
analytical detections, and the number and percent of systems with one or more analytical
detections above a health threshold of concern. Population served occurrence measures include
the number and percent of customers by systems with one or more analytical detections, and the
number and percent of population served by systems with one or more analytical detections of a
given contaminant above a health threshold of concern.
6.1 Summary of Stage 1 Contaminant Occurrence Findings
Several Stage 1 analyses were conducted to characterize national occurrence of regulated
contaminants in public drinking water systems and are summarized in Exhibits 6-1 and 6-2.
Stage 1 analyses measured occurrence at systems, for a general system-level assessment of
occurrence, and for population served by systems, for a preliminary assessment of potential
exposure to contaminants in drinking water. Both of these occurrence measures were conducted
relative to a contaminant's MRL, identifying analytical detections for a broad assessment of the
rate of occurrence, and relative to each contaminant's MCL concentration, making a preliminary
estimate of occurrence and exposure at or above a contaminant's health-based drinking water
standard. The percent of systems and population served by systems with at least one detection
greater than the MCL concentration indicates the proportion of all systems or population served
by systems with any analytical results exceeding the concentration value of the MCL. Note that
this does not indicate an MCL violation. An MCL violation occurs when the MCL is exceeded
by the average results from four consecutive quarterly confirmation samples. These Stage 1
analytical findings are organized by contaminant group.
Although the various measures of occurrence generally identify similar lists of higher and
lower occurring contaminants, there are differences in the findings of the different measures and
these differences can serve to more fully characterize national occurrence of the contaminants.
For example, xylenes were found to be the highest occurring VOC based on the assessment
relative to the MRL, but were also one of the lowest occurring VOCs based on the assessment
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relative to the MCL concentration. Xylenes, in other words, are found to have the highest rate of
occurrence, but that occurrence is almost exclusively at very low concentrations that are almost
always below concentration thresholds at which xylenes could potentially have negative health
effects. Another aspect of the different occurrence measures relates to the size distribution of
systems with detections, which influences the size of the potentially exposed population. In this
context, "small" systems serve a small population and "large" systems serve a large population.
A small number of very large systems with contaminant detections will result in a greater
exposed population than will a larger number of small systems with detections. For example, two
VOCs, dichloromethane and trichloroethylene, have similar percents of systems (0.293% and
0.387%, respectively) with at least one detection greater than their respective MCL
concentrations, yet dichloromethane has a significantly smaller percentage of population served
by systems with detections greater than the MCL concentration (1.298%) than does
trichloroethylene (5.264%).
Inorganic Chemicals
One occurrence measure is the percentage of systems with at least one sample detection
of a contaminant. Using this measure to assess the regulated lOCs wide range of occurrence was
found. Percentages ranged from a high of 79.276% of systems with at least one fluoride
detection to a low of 3.117% of systems with at least one beryllium detection. The five highest
occurring lOCs based on the percent of systems with detections were fluoride (79.276%), barium
(72.020%), nitrate (69.942%), arsenic (37.329%), and chromium (24.209%).
A related but different Stage 1 measure, a preliminary estimate of potential drinking
water exposure to a contaminant, is the percent of the population served by systems with at least
one sample detection of a particular contaminant. Based on this measure, the five lOCs with the
highest rates of occurrence/potential exposure are fluoride (with 94.425% of the population
served by systems with at least one reported detection), nitrate (90.952%), barium (79.473%),
arsenic (49.309%), and nitrite (44.615%).
In addition to characterizing the rates of contaminant occurrence, the Stage 1 analysis can
provide information regarding the degree of contaminant occurrence with assessments relative to
an important health concentration threshold such as a contaminant's MCL concentration. For
lOCs, the percentage of systems with at least one sample detection greater than a contaminant's
MCL concentration ranged from a high of 2.487% for nitrate to a low of 0.088% for chromium.
The five lOCs with the highest Stage 1 estimated occurrence relative to the MCL concentration
are nitrate (2.487%), fluoride (1.068%), arsenic (0.750%), nitrite (0.736%) and cadmium
(0.274%).
A preliminary estimate of drinking water exposure relative to each contaminant's
drinking water standard is given by the percentage of the population served by systems with at
least one sample detection greater than a contaminant's MCL concentration. Using this measure,
the five regulated lOCs with the highest occurrence/potential exposure are nitrate (7.310% of the
population served by systems with at least one detection greater than the nitrate MCL
concentration), nitrite (4.840%), antimony (1.505%), beryllium (1.386%), and arsenic (1.240%).
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Synthetic Organic Chemicals
This same set of occurrence measures was used to assess the regulated SOCs (Exhibits 6-
1 and 6-2). Based on the percentage of systems with at least one sample detection of a
contaminant, SOC occurrence ranged from a high of 11.197% of systems with at least one di(2-
ethylhexyl)phthalate detection to a low of 0.132% of systems with at least one toxaphene
detection. The five highest occurring regulated SOCs based on the percent of systems with
detections were di(2-ethylhexyl)phthalate (11.197%), atrazine (2.386%), dalapon (1.828%), di(2-
ethylhexyl)adipate (1.754%), and l,2-dibromo-3-chloropropane (1.029%). The high occurrence
of di(2-ethylhexyl)phthalate could be due, in part, to sample contamination from older generation
laboratory and field sampling equipment made of plastics that contained (and sometimes
released) phthalates.
Based on the related but different Stage 1 measure of potential exposure, the percent of
the population served by systems with at least one sample detection, the five SOCs with the
highest rates of occurrence/potential exposure are di(2-ethylhexyl)phthalate (with 25.227% of
the population served by systems with at least one detection), atrazine (17.077%), simazine
(10.641%), l,2-dibromo-3-chloropropane (9.268%), and 2,4-dichlorophenoxyacetic acid
(8.714%).
Based on the assessment of the percent of systems with at least one sample detection
greater than a contaminant's MCL concentration, the regulated SOCs ranged from a high of
1.663% for di(2-ethylhexyl)phthalate to a low of 0.000% (no systems) for carbofuran, diquat,
glyphosate, hexachlorocyclopentadiene, methoxychlor, picloram, and silvex. The five SOCs with
the highest Stage 1 estimated occurrence by system relative to the MCL concentration are di(2-
ethylhexyl)phthalate (1.663%), l,2-dibromo-3-chloropropane (0.388%), atrazine (0.263%),
ethylene dibromide (0.243%), and benzo(a)pyrene (0.049%).
Based on the percentage of the population served by systems with at least one sample
detection greater than a contaminant's MCL concentration, the five SOCs with the highest
occurrence/ potential exposure are di(2-ethylhexyl)phthalate (6.397%), l,2-dibromo-3-
chloropropane (1.627%), atrazine (1.551%), ethylene dibromide (1.201%), and benzo(a)pyrene
(0.117%).
Volatile Organic Chemicals
This same set of occurrence measures was also used to assess the regulated VOCs
(Exhibits 6-1 and 6-2). Based on the percentage of systems with at least one sample detection of
a contaminant, VOC occurrence ranged from a high of 7.592% of systems with at least one
xylene detection to a low of 0.179% of systems with at least one 1,1,2-trichloroethane detection.
The five highest occurring regulated VOCs based on the percent of systems with detections were
xylenes (7.592%), toluene (5.764%), ethylbenezene (3.909%), dichloromethane (3.903%), and
tetrachloroethylene (2.502%).
Based on the related but different Stage 1 measure of the percent of the population served
by systems with at least one sample detection, the five VOCs with the highest rates of
occurrence/potential exposure are xylenes (with 17.480% of the population served by systems
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with at least one xylene detection), dichloromethane (16.542%), tetrachloroethylene (14.076%),
toluene (13.215%), and trichloroethylene (13.018%).
Based on the assessment of the percent of systems with at least one sample detection
greater than a contaminant's MCL concentration, the regulated VOCs ranged from a high of
0.478% for tetrachloroethylene to a low of 0.000% for six contaminants (1,2-dichlorobenzene;
trans-1,2-dichloroethylene; ethylbenzene; monochlorobenzene; 1,2,4-trichlorobenzene, and;
xylenes). The five VOCs with the highest Stage 1 estimated occurrence by system relative to the
MCL concentration are tetrachloroethylene (0.478%), trichloroethylene (0.387%),
dichloromethane (0.293%), benzene (0.125%) and carbon tetrachloride (0.113%).
Finally, based on the percentage of the population served by systems reporting at least
one sample detection greater than a contaminant's MCL concentration, a preliminary estimate of
drinking water exposure at or above each contaminant's drinking water standard, the five VOCs
with the highest occurrence/potential exposure are tetrachloroethylene (6.448%),
trichloroethylene (5.264%), 1,1-dichloroethylene (2.517%), carbon tetrachloride (2.189%), and
dichloromethane (1.298%).
Radionuclides
This same set of occurrence measures was also used to assess the regulated radionuclides
(Exhibits 6-1 and 6-2). Based on the percentage of systems with at least one sample detection of
a contaminant, radionuclide occurrence ranged from a high of 74.513% of systems with at least
one detection of beta particles to a low of 62.188% of systems with at least one combined
radium-226/-228 detection (pre-December 2003). Based on the related but different Stage 1
measure of the percent of the population served by systems with at least one sample detection,
the rates of occurrence/potential exposure for the radionuclides are as follows: beta particles
(with 86.861% of the population served by systems with at least one beta particle detection),
uranium (77.256%), combined radium-226/-228 (71.796% pre-December 2003 and 56.754%
post-December 2003), and alpha particles (68.542%).
Based on the assessment of the percent of systems with at least one sample detection
greater than a contaminant's MCL concentration, the regulated radionuclides ranged from a high
of 11.456% for combined radium-226/-228 (pre-December 2003) to a low of 0.527% for beta
particles. Based on the percentage of the population served by systems reporting at least one
sample detection greater than a contaminant's MCL concentration (a preliminary estimate of
drinking water exposure at or above each contaminant's drinking water standard), the
occurrence/potential exposure for the radionuclides are as follows: uranium (11.884%),
combined radium-226/-228 (9.620% pre-December 2003 and 9.201% post-December 2003),
alpha particles (6.208%), and beta particles (1.228%).
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Exhibit 6-1. Summary of Stage 1 Contaminant Occurrence Findings - Systems
and Population Served by Systems
Contaminant
Systems With
Detections > MRL
Number
Percent
Population Served
by Systems With
Detections > MRL
Number
Percent
Range of Detected
Concentrations
Inorganic Chemicals
Antimony
Arsenic
Asbestos
Barium
Beryllium
Cadmium
Chromium (Total)
Cyanide
Fluoride
Mercury (Inorganic)
Nitrate (as N)
Nitrite (as N)
Selenium
Thallium
2,930
18,468
268
35,380
1,497
2,742
11,840
1,329
38,528
1,937
83,606
19,263
8,456
1,709
5.978%
37.329%
3.237%
72.020%
3.117%
5.605%
24.209%
4.144%
79.276%
3.964%
69.942%
22.318%
17.284%
3.493%
42,882,761
113,605,034
13,919,689
182,610,220
30,507,036
38,915,670
94,666,150
28,313,375
220,548,542
46,091,272
208,741,341
92,793,425
85,160,808
28,197,102
19.208%
49.309%
16.345%
79.473%
13.780%
16.943%
41.226%
17.428%
94.425%
20.052%
90.952%
44.615%
37.048%
12.626%
0.000041 - 0.062 mg/L
0.000058 - 0.759 mg/L
0.008- 2,494 MFL
0.000086 -19 mg/L
0.000021 -0.14 mg/L
0.000006 - 0.085 mg/L
0.000009 - 5.2 mg/L
0.0009 -1.93 mg/L
0.00006-38 mg/L
0.000021 -0.104 mg/L
1.04E-06-99mg/L
0.000001 -13 mg/L
0.00006 - 0.49 mg/L
0.00003-0.091 mg/L
Synthetic Organic Chemicals
Alachlor
Atrazine
Benzo(a)pyrene
Carbofuran
Chlordane
Dalapon
Di(2-ethylhexyl)adipate (DEHA)
Di(2-ethylhexyl)phthalate (DEHP)
1 ,2-Dibromo-3-chloropropane
(DBCP)
2,4-Dichlorophenoxyacetic acid
(2,4-D)
121
888
140
45
67
519
507
3,098
387
299
0.328%
2.386%
0.490%
0.145%
0.210%
1.828%
1.754%
11.197%
1.029%
0.901%
7,997,150
34,217,212
9,311,608
5,568,955
3,417,785
13,583,043
12,459,912
45,395,007
17,955,940
16,334,821
4.053%
17.077%
5.057%
3.315%
1.878%
7.623%
6.767%
25.227%
9.268%
8.714%
0.01 -14ug/L
0.00037 - 27 ug/L
0.007-1 ug/L
0.23 - 8 ug/L
0.005 - 5.4 ug/L
0.01 - 1,210 ug/L
0.01 -1,300ug/L
0.05- 250 ug/L
0.0014- 10.805 ug/L
0.009- 230 ug/L
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Contaminant
Dinoseb
Diquat
Endothall
Endrin
Ethylene Dibromide (EDB)
Glyphosate
Heptachlor
Heptachlor Epoxide
Hexachlorobenzene
Hexachlorocyclopentadiene
Lindane (gamma-
Hexachlorocyclohexane)
Methoxychlor
Oxamyl (Vydate)
Pentachlorophenol
Picloram
Polychlorinated biphenyls (PCBs)
Simazine
Toxaphene
2,3,7,8-TCDD (Dioxin)
2,4,5-Trichlorophenoxypropionic
Acid (Silvex)
Systems With
Detections > MRL
Number
87
69
33
47
195
29
263
73
112
225
84
53
71
251
136
29
267
40
17
78
Percent
0.266%
0.442%
0.233%
0.143%
0.538%
0.177%
0.796%
0.221%
0.341%
0.686%
0.253%
0.159%
0.230%
0.731%
0.413%
0.158%
0.725%
0.132%
0.713%
0.237%
Population Served
by Systems With
Detections > MRL
Number
5,646,930
8,558,497
6,114,200
6,951,834
13,028,187
3,542,382
8,548,973
3,896,528
3,932,601
15,372,168
7,579,836
5,546,555
6,279,825
9,703,607
8,526,791
3,678,868
20,962,003
3,538,487
307,540
4,755,587
Percent
3.087%
7.095%
5.158%
3.777%
6.924%
3.047%
4.635%
2.112%
2.136%
8.321%
4.048%
2.956%
3.752%
5.094%
4.575%
2.964%
10.641%
2.211%
0.582%
2.599%
Range of Detected
Concentrations
0.0355- 45 |jg/L
0.08-13|jg/L
0.1 -548.1 |jg/L
0.001 -3.3|jg/L
0.001387-1. 6 |jg/L
2.6 - 700 |jg/L
0.001 -0.5|jg/L
0.001 -2|jg/L
0.002- 10 |jg/L
0.001 -15|jg/L
0.001 -0.69|jg/L
0.0073-1.1 |jg/L
0.18-531.1 |jg/L
0.01 -10|jg/L
0.01 -190|jg/L
0.057-1. 44 |jg/L
0.01 -12.4|jg/L
0.04- 6.8 |jg/L
0.000001 -0.0001 78 pg/L
0.0147- 28 |jg/L
Volatile Organic Chemicals
Benzene
Carbon Tetrachloride
1,2-Dichlorobenzene
1,4-Dichlorobenzene
1,2-Dichloroethane
1,1-Dichloroethylene
446
650
116
748
376
347
0.884%
1.289%
0.230%
1.497%
0.745%
0.688%
12,191,524
22,309,062
3,735,111
7,463,993
14,019,067
13,426,923
5.372%
9.831%
1 .646%
3.325%
6.178%
5.917%
0.031 -93|jg/L
0.003- 300 |jg/L
0.004-1 10 |jg/L
0.002 - 700 |jg/L
0.005-1 35.8 |jg/L
0.054- 214 |jg/L
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EPA - OGWDW Analysis of Occurrence Data for the Second Six-Year Review ofNPDWRs EPA-815-B-09-006
Revised September 2010
Contaminant
cis-1 ,2-Dichloroethylene
trans-1 ,2-Dichloroethylene
Dichloromethane
(Methylene Chloride)
1,2-Dichloropropane
Ethylbenzene
Monochlorobenzene
Styrene
Tetrachloroethylene (PCE)
Toluene
1 ,2,4-Trichlorobenzene
1,1,1-Trichloroethane
1,1,2-Trichloroethane
Trichloroethylene (TCE)
Vinyl Chloride
Xylenes (Total)
Systems With
Detections > MRL
Number
485
95
1,958
242
1,972
135
528
1,262
2,908
161
542
90
1,013
207
3,621
Percent
0.964%
0.189%
3.903%
0.480%
3.909%
0.268%
1.047%
2.502%
5.764%
0.321%
1.075%
0.179%
2.009%
0.411%
7.592%
Population Served
by Systems With
Detections > MRL
Number
19,038,241
3,096,479
37,524,772
10,172,188
26,908,998
3,529,759
5,685,948
31,952,900
29,991,392
2,016,307
14,883,555
2,060,549
29,537,747
3,528,685
38,118,213
Percent
8.438%
1.372%
16.542%
4.483%
11.857%
1.564%
2.506%
14.076%
13.215%
0.889%
6.559%
0.908%
13.018%
1.558%
17.480%
Range of Detected
Concentrations
0.008- 220 ug/L
0.025- 24 ug/L
0.0041 - 315.9 ug/L
0.005- 26.2 ug/L
0.002- 557 ug/L
0.003- 42 ug/L
0.002- 710 ug/L
0.001 -177ug/L
0.002 -5,1 00 ug/L
0.003 - 70 ug/L
0.009-1, 400 ug/L
0.015-40ug/L
0.001 -159ug/L
0.013- 46.5 ug/L
0.002- 4,000 ug/L
Radiological Contaminants
Alpha Particles
Beta Particles
Combined Radium-226 & -228
(original Radionuclides rule)
Combined Radium-226 & -228
(revised Radionuclides rule)
Uranium
12,699
10,604
4,281
2,724
4,101
68.080%
74.513%
62.188%
69.972%
69.262%
83,052,912
104,471,857
34,047,514
23,511,235
54,566,649
68.542%
86.861%
71.796%
56.754%
77.256%
8E-10- 348.33 pCi/L
0.00001 -488pCi/L
0.01 -142pCi/L
0.0008- 56.66 pCi/L
1.49E-06-469ug/L
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Revised September 2010
Exhibit 6-2. Number and Percent of Systems and Population Served by Systems
with Detections Greater than the MCL Concentration
Contaminant
(MCL Concentration)
Systems With
Detections > MCL Concentration
Number
Percent
Population Served by Systems With
Detections > MCL Concentration
Number
Percent
Inorganic Chemicals
Antimony
(0.006 mg/L)
Arsenic1
(0.05 mg/L)
Asbestos
(7 MFL)
Barium
(2 mg/L)
Beryllium
(0.004 mg/L)
Cadmium
(0.005 mg/L)
Chromium (Total)
(0.1 mg/L)
Cyanide
(0.2 mg/L)
Fluoride
(4 mg/L)
Mercury (Inorganic)
(0.002 mg/L)
Nitrate (as N)
(10 mg/L)
Nitrite (as N)
(1 mg/L)
Selenium
(0.05 mg/L)
Thallium
(0.002 mg/L)
130
371
14
66
53
134
43
44
519
82
2,973
635
65
125
0.265%
0.750%
0.169%
0.134%
0.110%
0.274%
0.088%
0.137%
1.068%
0.168%
2.487%
0.736%
0.133%
0.255%
3,360,506
2,855,848
253,977
211,108
3,067,277
2,399,069
716,617
256,908
2,823,214
2,591,320
16,777,093
10,067,031
224,816
1,831,801
1.505%
1.240%
0.298%
0.092%
1.386%
1.045%
0.312%
0.158%
1.209%
1.127%
7.310%
4.840%
0.098%
0.820%
Synthetic Organic Chemicals
Alachlor
(2 ug/L)
Atrazine
(3 ug/L)
Benzo(a)pyrene
(0.2 ug/L)
Carbofuran
(40 ug/L)
Chlordane
(2 ug/L)
Dalapon
(200 ug/L)
Di(2-ethylhexyl)adipate (DEHA)
(400 ug/L)
Di(2-ethylhexyl)phthalate (DEHP)
(6 ug/L)
8
98
14
0
4
1
2
460
0.022%
0.263%
0.049%
0.000%
0.013%
0.004%
0.007%
1 .663%
25,419
3,108,330
214,983
0
625
20,114
22,913
11,510,704
0.013%
1.551%
0.117%
0.000%
0.000%
0.011%
0.012%
6.397%
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EPA - OGWDW Analysis of Occurrence Data for the Second Six-Year Review ofNPDWRs EPA-815-B-09-006
Revised September 2010
Contaminant
(MCL Concentration)
1 ,2-Dibromo-3-chloropropane
(DBCP) (0.2 |jg/L)
2,4-Dichlorophenoxyacetic acid
(70 ug/L)
Dinoseb
(7 ug/L)
Diquat
(20 ug/L)
Endothall
(100|jg/L)
Endrin
(2 ug/L)
Ethylene Dibromide (EDB)
(0.05 |jg/L)
Glyphosate
(700 |jg/L)
Heptachlor
(0.4 Mg/L)
Heptachlor Epoxide
(0.2 ug/L)
Hexachlorobenzene
(1 Mg/L)
Hexachlorocyclopentadiene
(50 M9/L)
Lindane (gamma-
Hexachlorocyclohexane) (0.2 |jg/L)
Methoxychlor
(40 ug/L)
Oxamyl (Vydate)
(200 |jg/L)
Pentachlorophenol
(1 ug/L)
Picloram
(500 |jg/L)
Polychlorinated biphenyls (PCBs)
(0.5 ug/L)
Simazine
(4 ug/L)
Toxaphene
(3 ug/L)
2,3,7,8-TCDD (Dioxin)
(0.00003 |jg/L)
2,4,5-Trichlorophenoxypropionic
Acid (Silvex) (50 ug/L)
Systems With
Detections > MCL Concentration
Number
146
1
5
0
3
1
88
0
2
6
4
0
3
0
1
8
0
2
16
5
1
0
Percent
0.388%
0.003%
0.015%
0.000%
0.021%
0.003%
0.243%
0.000%
0.006%
0.018%
0.012%
0.000%
0.009%
0.000%
0.003%
0.023%
0.000%
0.011%
0.043%
0.016%
0.042%
0.000%
Population Served by Systems With
Detections > MCL Concentration
Number
3,151,491
13,933
26,212
0
74,657
300
2,260,060
0
4,699
19,347
4,944
0
4,836
0
200
11,805
0
125,046
123,159
27,063
7,100
0
Percent
1.627%
0.007%
0.014%
0.000%
0.063%
0.000%
1.201%
0.000%
0.003%
0.010%
0.003%
0.000%
0.003%
0.000%
0.000%
0.006%
0.000%
0.101%
0.063%
0.017%
0.013%
0.000%
Volatile Organic Chemicals
Benzene
(5 ug/L)
Carbon Tetrachloride
(5 ug/L)
1,2-Dichlorobenzene
(600 |jg/L)
1,4-Dichlorobenzene
(75 ug/L)
63
57
0
3
0.125%
0.113%
0.000%
0.006%
486,938
4,967,564
0
99,019
0.215%
2.189%
0.000%
0.044%
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Contaminant
(MCL Concentration)
1,2-Dichloroethane
(5 ug/L)
1,1-Dichloroethylene
(7 ug/L)
cis-1 ,2-Dichloroethylene
(70 ug/L)
trans-1 ,2-Dichloroethylene
(100|jg/L)
Dichloromethane (Methylene
Chloride) (5 |jg/L)
1,2-Dichloropropane
(5 ug/L)
Ethylbenzene
(700 |jg/L)
Monochlorobenzene
(100|jg/L)
Styrene
(100|jg/L)
Tetrachloroethylene (PCE)
(5 ug/L)
Toluene
(1,000|jg/L)
1 ,2,4-Trichlorobenzene
(70 ug/L)
1,1,1-Trichloroethane
(200 |jg/L)
1,1,2-Trichloroethane
(5 ug/L)
Trichloroethylene (TCE)
(5 ug/L)
Vinyl Chloride
(2 Mg/L)
Xylenes (Total)
(1 0,000 |jg/L)
Systems With
Detections > MCL Concentration
Number
36
33
5
0
147
10
0
0
4
241
1
0
2
7
195
41
0
Percent
0.071%
0.065%
0.010%
0.000%
0.293%
0.020%
0.000%
0.000%
0.008%
0.478%
0.002%
0.000%
0.004%
0.014%
0.387%
0.081%
0.000%
Population Served by Systems With
Detections > MCL Concentration
Number
438,212
5,712,193
166,753
0
2,943,449
351,687
0
0
1,310
14,637,946
500
0
226
126,351
11,945,084
482,079
0
Percent
0.193%
2.517%
0.074%
0.000%
1.298%
0.155%
0.000%
0.000%
0.001%
6.448%
0.000%
0.000%
0.000%
0.056%
5.264%
0.213%
0.000%
Radiological Contaminants
Alpha Particles
(15pCi/L)
Beta Particles
(screening level = 50 pCi/L)
Combined Radium-226 & -228
(original Radionuclides rule)
(5 pCi/L)
Combined Radium-226 & -228
(revised Radionuclides rule)
(5 pCi/L)
Uranium
(30 ug/L)
854
75
502
446
448
4.578%
0.527%
7.292%
11.456%
7.566%
7,522,810 6.208%
1,477,336 1.228%
4,562,001 9.620%
3,811,454 9.201%
8,394,113 11.884%
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EPA - OGWDW
Analysis of Occurrence Data for the Second Six-Year Review ofNPDWRs
EPA-815-B-09-006
Revised September 2010
6.2 Comparison of Stage 1 Analysis of First and Second Six-Year Reviews
Exhibit 6-3 presents a comparison of contaminant occurrence estimates from the first Six-
Year Review, based on compliance monitoring data from 1993-1997, and the second Six-Year
Review, based on compliance monitoring data from 1998-2005. Some of the contaminants
assessed for the second Six-Year Review were not assessed for the first Six-Year Review. The
occurrence estimates from the first Six-Year Review and the second Six-Year Review appear to
be broadly similar. Note, however, that comparisons or apparent occurrence changes over time
must be somewhat qualified given the differences between the two datasets. The first Six-Year
Review dataset consisted of data from 16 states that were assembled into a "national cross-
section" that was indicative, though not statistically representative, of national occurrence. In
contrast, the second Six-Year Review-ICR Dataset consists of data from 45 states that serve as a
very large sample that, essentially, is nationally representative. Therefore, it is possible that
differences in occurrence measures between the first and second Six-Year Review Stage 1
findings summarized in Exhibit 6-3 reflect differences in the respective datasets rather than
differences in actual occurrence. Nonetheless, both datasets provided sound assessments of
national contaminant occurrence in systems, so significant differences in occurrence estimates
generated for the first and second Six-Year Reviews may provide information on changes in
occurrence over time. Occurrence evaluations specifically designed to assess occurrence trends
over time might assess occurrence changes for a particular contaminant only in all the systems
that were included in both the first and second Six-Year Review datasets. These temporal
analyses of contaminant occurrence were not conducted for this current assessment.
Exhibit 6-3. Comparison of Stage 1 Analyses of the First Six-Year Review and the
Second Six-Year Review based on the Percent of Systems
Contaminant
(MCL Concentration)
Percent of Systems
With Detections > MRL
Six-Year 11
Six-Year 2
Percent of Systems
With Detections
> MCL Concentration
Six-Year 11
Six-Year 2
Inorganic Chemicals
Antimony
(0.006 mg/L)
Barium
(2 mg/L)
Beryllium
(0.004 mg/L)
Cadmium
(0.005 mg/L)
Chromium (Total)
(0.1 mg/L)
Cyanide
(0.2 mg/L)
Fluoride
(4 mg/L)
Mercury (Inorganic)
(0.002 mg/L)
Selenium
(0.05 mg/L)
14.4%
71.2%
3.32%
17.6%
18.3%
17.0%
83.8%
17.3%
22.1%
5.98%
72.02%
3.12%
5.61%
24.21%
4.14%
79.28%
3.96%
17.28%
0.62%
0.17%
0.22%
0.54%
0.13%
0.17%
1.28%
0.26%
0.11%
0.27%
0.13%
0.11%
0.27%
0.09%
0.14%
1.07%
0.17%
0.13%
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Revised September 2010
Contaminant
(MCL Concentration)
Thallium
(0.002 mg/L)
Percent of Systems
With Detections > MRL
Six-Year 11
4.22%
Six-Year 2
3.49%
Percent of Systems
With Detections
> MCL Concentration
Six-Year 11
0.68%
Six-Year 2
0.26%
Synthetic Organic Chemicals
Alachlor
(2 M9/L)
Atrazine
(3 M9/L)
Benzo(a)pyrene
(0.2 M9/L)
Carbofuran
(40 M9/L)
Chlordane
(2 M9/L)
Dalapon
(200 |jg/L)
Di(2-ethylhexyl)adipate (DEHA)
(400 |jg/L)
Di(2-ethylhexyl)phthalate (DEHP)
(6 M9/L)
1 ,2-Dibromo-3-chloropropane (DBCP)
(0.2 M9/L)
2,4-Dichlorophenoxyacetic acid (2,4-D)
(70 M9/L)
Dinoseb
(7 M9/L)
Diquat
(20 M9/L)
Endothall
(100|jg/L)
Endrin
(2 M9/L)
Ethylene Dibromide (EDB)
(0.05 |jg/L)
Glyphosate
(700 |jg/L)
Heptachlor
(0.4 M9/L)
Heptachlor Epoxide
(0.2 M9/L)
Hexachlorobenzene
d M9/L)
Hexachlorocyclopentadiene
(50 M9/L)
Lindane (gamma-Hexachlorocyclohexane)
(0.2 uq/D
Methoxychlor
(40 M9/L)
Oxamyl (Vydate)
(200 |jg/L)
Pentachlorophenol
d M9/L)
Picloram
(500 |jg/L)
0.67%
3.83%
0.44%
0.06%
1.19%
1.10%
7.31%
12.5%
1.61%
0.12%
0.24%
0.49%
0.15%
0.18%
1.06%
0.10%
0.08%
0.09%
0.09%
0.89%
0.16%
0.19%
0.08%
0.43%
0.41%
0.33%
2.39%
0.49%
0.14%
0.21%
1.83%
1.75%
1 1 .20%
1.03%
0.90%
0.27%
0.44%
0.23%
0.14%
0.54%
0.18%
0.80%
0.22%
0.34%
0.69%
0.25%
0.16%
0.23%
0.73%
0.41%
0.00%
0.68%
0.05%
0.00%
0.01%
0.00%
0.01%
2.20%
0.91%
0.02%
0.02%
0.02%
0.03%
0.02%
0.72%
0.00%
0.01%
0.03%
0.01%
0.00%
0.04%
0.01%
0.00%
0.03%
0.00%
0.02%
0.26%
0.05%
0.00%
0.01%
0.00%
0.01%
1 .66%
0.39%
0.00%
0.02%
0.00%
0.02%
0.00%
0.24%
0.00%
0.01%
0.02%
0.01%
0.00%
0.01%
0.00%
0.00%
0.02%
0.00%
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Revised September 2010
Contaminant
(MCL Concentration)
Polychlorinated biphenyls (PCBs)
(0.5 Mg/L)
Simazine
(4 Mg/L)
Toxaphene
(3 Mg/L)
2,4,5-Trichlorophenoxypropionic Acid
(Silvex) (50 |jg/L)
Percent of Systems
With Detections > MRL
Six-Year 11
0.09%
1.80%
0.08%
0.40%
Six-Year 2
0.16%
0.72%
0.13%
0.24%
Percent of Systems
With Detections
> MCL Concentration
Six-Year 11
0.03%
0.06%
0.01%
0.00%
Six-Year 2
0.01%
0.04%
0.02%
0.00%
Volatile Organic Chemicals
Benzene
(5 M9/L)
Carbon Tetrachloride
(5 M9/L)
1 ,2-Dichlorobenzene
(600 |jg/L)
1 ,4-Dichlorobenzene
(75 Mg/L)
1,2-Dichloroethane
(5 M9/L)
1,1-Dichloroethylene
(7 Mg/L)
cis-1 ,2-Dichloroethylene
(70 Mg/L)
trans-1 ,2-Dichloroethylene
(100|jg/L)
Dichloromethane (Methylene Chloride)
(5 M9/L)
1 ,2-Dichloropropane
(5 M9/L)
Ethylbenzene
(700 |jg/L)
Monochlorobenzene
(100 Mg/L)
Styrene
(100|jg/L)
Tetrachloroethylene (PCE)
(5 Mg/L)
Toluene
(1,000|jg/L)
1 ,2,4-Trichlorobenzene
(70 Mg/L)
1,1,1 -Trichloroethane
(200 |jg/L)
1 , 1 ,2-Trichloroethane
(5 Mg/L)
Trichloroethylene (TCE)
(5 Mg/L)
Vinyl Chloride
(2 Mg/L)
Xylenes (Total)
(10,000 Mg/L)
1.31%
1.99%
0.61%
1.76%
1.31%
1.58%
1.37%
0.53%
8.59%
0.67%
3.62%
0.75%
0.99%
3.36%
4.73%
0.61%
2.50%
0.62%
2.61%
0.61%
4.16%
0.88%
1.29%
0.23%
1.50%
0.75%
0.69%
0.96%
0.19%
3.90%
0.48%
3.91%
0.27%
1.05%
2.50%
5.76%
0.32%
1.07%
0.18%
2.01%
0.41%
7.59%
0.19%
0.20%
0.00%
0.00%
0.13%
0.24%
0.03%
0.00%
0.67%
0.07%
0.00%
0.00%
0.00%
0.78%
0.00%
0.00%
0.01%
0.04%
0.65%
0.11%
0.00%
0.12%
0.11%
0.00%
0.01%
0.07%
0.07%
0.01%
0.00%
0.29%
0.02%
0.00%
0.00%
0.01%
0.48%
0.00%
0.00%
0.00%
0.01%
0.39%
0.08%
0.00%
1. The first Six-Year Review occurrence estimate values presented in this table are from the report titled Occurrence
Estimation Methodology and Occurrence Findings for Six-Year Review of National Primary Drinking Water
Regulations. EPA Report 815-R-03-006, Office of Water (USEPA, 2003b).
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Revised September 2010
6.3 System Sample Point Level Analysis
The basic Stage 1 analytical methodology is a conservative approach; occurrence
measures are based on simple counts of whether or not a system has at least one monitoring
sample identified with a contaminant detection greater than a specified concentration threshold.
The approach includes another implicit conservative assumption; if a detection is found in a
single entry point to the distribution system or other formal system sample point (SP), then the
entire population served by the system is assumed to be potentially exposed to the detected
contaminant at the system. For example, if a system serves a population of 30,000 and identified
a detection of a contaminant in one of its two SPs, the primary Stage 1 analytical methodology
would estimate that the entire population served by the system (30,000) was potentially exposed
to the maximum detected levels of the contaminant found in the one SP. In this context, sample
points (SPs) are defined as the authorized drinking water sample locations for compliance
monitoring of regulated contaminants. SPs primarily are entry points to the distribution system,
but a small number of states allow for sampling of raw, untreated ground water wells or surface
water intakes as well.
In reality, many systems get water from multiple water sources, such as a mix of
purchased and non-purchased water, ground water wells and surface water source intakes, etc. In
systems with multiple SPs, such as multiple surface water intakes, multiple wells, and/or
multiple entry points to the distribution system, contaminant occurrence in one source or one SP
does not necessarily mean contaminant occurrence in all sources or SPs that distribute water to
consumers. Given this, additional Stage 1 analyses were conducted at the SP-level to provide
supplementary details of contaminant occurrence.
The SP analysis is a less conservative estimate of the population served by systems with
contaminant detections. To derive this SP-level measure, an assumption was necessary regarding
population served by individual SPs at drinking water systems. The population served by each
SP, and entry point to the distribution system, at a system is often difficult to know and is rarely,
if ever, reported along with other compliance monitoring records. Therefore, EPA assumed for
the analysis that the total population served by a particular system is equally distributed across
all SPs at the system.14 With this assumption, the population served by a SP with a detection of a
particular contaminant is calculated by multiplying the system's total population served by the
portion of that system's SPs with a contaminant detection. For example, if a system serves a
population of 30,000 and found detections of a contaminant in one of its two SPs, then a
population of 15,000 (30,000 x l/2) would be estimated to be potentially exposed to the
contaminant.
This sample point analysis required determination of the total number of entry points
and/or other SPs for each system. This was done by counting the total number of unique SPs for
14 This "proportional population" assumption is based on the idea that for every public water system, each sample
point serves an equal portion of the system's total population. How well this assumption reflects actual populations
potentially exposed to contaminant occurrence at a system will depend on the distribution system and service
population configurations at individual systems.
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each system over the entire eight years of data. These counts were done separately for each
contaminant at every system. While conducting these counts, it appeared that some systems may
have changed their sample point numbering conventions, their "SP identification codes," the
formal sample point identification number, at some point over the eight years of data, which
would result in the number of apparent sample points being higher than the number of actual
sample points. If so, this approach to sample point counting could potentially overestimate the
total number of SPs for a system thereby resulting in an underestimate of the population served
by each SP.15
Exhibit 6-4 presents a summary of the Stage 1 findings based on SPs and population
served by SPs. Similar to the system-level analysis for the lOCs, fluoride and barium had the
highest percentage of SPs (78.424% and 67.150%, respectively) with detections at or above the
MRL. The largest percentage of the population served by SPs with detections at or above the
MRL was for fluoride (91.005%). Of all the lOCs, nitrate had the highest percent of SPs with
detections greater than the MCL concentration (2.072%).
Di(2-ethylhexyl)phthalate was the highest occurring SOC based on the percent of SPs
with detections at or above the MRL (8.726%). Atrazine and di(2-ethylhexyl)phthalate had the
highest percentages of population served by SPs with detections at or above the MRL (13.042 %
and 12.451%, respectively). In addition, di(2-ethylhexyl)phthalate had the highest percent of SPs
with detections greater than the MCL concentration of all the SOCs (1.071%). The high
occurrence of di(2-ethylhexyl)phthalate could be due, in part, to sample contamination from
older generation laboratory and field sampling equipment made of plastics that contained (and
sometimes released) phthalates.
Similar to the system-level analysis, total xylenes was the highest occurring VOC, based
on the percent of SPs with detections at or above the MRL, with 5.386% of SPs detecting. Of all
the VOCs, tetrachloroethylene and trichloroethylene had the highest percent of SPs with
detections greater than the MCL concentration (0.522% and 0.473%, respectively) and
population served by SPs with detections greater than the MCL concentration (1.212% and
1.452%, respectively).
Uranium was the highest occurring radionuclide, based on the percent of SPs with
detections at or above the MRL, with 69.796% of SPs detecting. Combined radium-226/-228 had
the highest percent of SPs with detections greater than the MCL concentration (7.239% pre-
December 2003 and 11.329% post-December 2003) and population served by SPs with
detections greater than the MCL concentration (4.784% pre-December 2003 and 4.729% post-
December 2003).
15 Another method was explored for counting the number of SPs. This other method used the maximum number of
SPs that sampled in a given year as the system's "total number of SPs." This approach likely avoids the issue of
changing SP numbering conventions over time. However, this method has the potential to underestimate the total
number of SPs for the system and therefore overestimate the population-served by each SP. For example, a system
could truly have a total of three SPs but those three SPs might not all sample within the same year, so the number of
actual SPs sampled over the eight-year period might be underestimated. If a system is on reduced monitoring, each
SP might only need to sample as often as once every three years.
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Exhibit 6-4. Summary of Stage 1 Contaminant Occurrence Findings - Sample
Points and Population Served by Sample Points
Contaminant
(MCL Concentration)
Percent of Sample Points
With
Detections
>MRL
With
Detections
> MCL
Concentration
Percent of Population-
Served by Sample Points
With
Detections
>MRL
With
Detections
> MCL
Concentration
Inorganic Chemicals
Antimony
(0.006 mg/L)
Arsenic
(0.05 mg/L)
Asbestos
(7 MFL)
Barium
(2 mg/L)
Beryllium
(0.004 mg/L)
Cadmium
(0.005 mg/L)
Chromium (Total)
(0.1 mg/L)
Cyanide
(0.2 mg/L)
Fluoride
(4 mg/L)
Mercury (Inorganic)
(0.002 mg/L)
Nitrate (as N)
(10 mg/L)
Nitrite (as N)
(1 mg/L)
Selenium
(0.05 mg/L)
Thallium
(0.002 mg/L)
4.407%
37.410%
2.426%
67.150%
2.220%
3.949%
21.720%
2.915%
78.424%
3.245%
66.205%
20.351%
15.632%
2.817%
0.189%
0.628%
0.132%
0.093%
0.074%
0.184%
0.062%
0.081%
0.729%
0.102%
2.072%
0.671%
0.099%
0.179%
1 1 .488%
36.759%
5.984%
72.546%
7.714%
8.687%
26.425%
10.515%
91.005%
7.821%
84.026%
26.926%
23.564%
7.408%
0.587%
0.209%
0.118%
0.052%
1.213%
0.549%
0.038%
0.030%
0.276%
0.204%
1.943%
1.155%
0.024%
0.213%
Synthetic Organic Chemicals
Alachlor
(2 ug/L)
Atrazine
(3 ug/L)
Benzo(a)pyrene
(0.2 ug/L)
Carbofuran
(40 ug/L)
Chlordane
(2 ug/L)
Dalapon
(200 ug/L)
Di(2-ethylhexyl)adipate (DEHA)
(400 ug/L)
Di(2-ethylhexyl)phthalate (DEHP)
(6 ug/L)
1 ,2-Dibromo-3-chloropropane (DBCP)
(0.2 ug/L)
0.235%
1.971%
0.315%
0.101%
0.146%
1.276%
1.286%
8.726%
1.616%
0.013%
0.160%
0.031%
0.000%
0.011%
0.002%
0.006%
1.071%
0.518%
3.736%
13.042%
4.235%
3.111%
1.701%
6.027%
4.602%
12.451%
5.276%
0.006%
0.783%
0.044%
0.000%
0.000%
0.011%
0.012%
1 .436%
0.422%
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Contaminant
(MCL Concentration)
2,4-Dichlorophenoxyacetic acid (2,4-D)
(70 Mg/L)
Dinoseb
(7 Mg/L)
Diquat
(20 Mg/L)
Endothall
(100|jg/L)
Endrin
(2 Mg/L)
Ethylene Dibromide (EDB)
(0.05 |jg/L)
Glyphosate
(700 |jg/L)
Heptachlor
(0.4 Mg/L)
Heptachlor Epoxide
(0.2 Mg/L)
Hexachlorobenzene
d Mg/L)
Hexachlorocyclopentadiene
(50 Mg/L)
Lindane (gamma-
Hexachlorocyclohexane) (0.2 Mg/L)
Methoxychlor
(40 Mg/L)
Oxamyl (Vydate)
(200 |jg/L)
Pentachlorophenol
d Mg/L)
Picloram
(500 |jg/L)
Polychlorinated biphenyls (PCBs)
(0.5 Mg/L)
Simazine
(4 Mg/L)
Toxaphene
(3 Mg/L)
2,3,7,8-TCDD (Dioxin)
(0.00003 |jg/L)
2,4,5-Trichlorophenoxypropionic Acid
(Silvex) (50 uq/L)
Percent of Sample Points
With
Detections
>MRL
0.630%
0.183%
0.318%
0.162%
0.105%
0.417%
0.118%
0.762%
0.162%
0.220%
0.451%
0.190%
0.110%
0.152%
0.503%
0.281%
0.131%
0.492%
0.093%
0.384%
0.166%
With
Detections
> MCL
Concentration
0.002%
0.009%
0.000%
0.012%
0.002%
0.186%
0.000%
0.004%
0.011%
0.007%
0.000%
0.005%
0.000%
0.002%
0.014%
0.000%
0.007%
0.026%
0.010%
0.019%
0.000%
Percent of Population-
Served by Sample Points
With
Detections
>MRL
5.587%
2.674%
2.899%
3.837%
3.619%
2.265%
2.749%
3.964%
1.937%
2.011%
5.573%
3.690%
2.273%
2.583%
3.515%
3.373%
2.472%
7.421%
2.061%
0.182%
2.078%
With
Detections
> MCL
Concentration
0.007%
0.003%
0.000%
0.024%
0.000%
0.311%
0.000%
0.001%
0.003%
0.003%
0.000%
0.001%
0.000%
0.000%
0.002%
0.000%
0.025%
0.061%
0.015%
0.013%
0.000%
Volatile Organic Chemicals
Benzene
(5 Mg/L)
Carbon Tetrachloride
(5 Mg/L)
1,2-Dichlorobenzene
(600 |jg/L)
1,4-Dichlorobenzene
(75 Mg/L)
1,2-Dichloroethane
(5 Mg/L)
0.591%
0.898%
0.153%
0.956%
0.639%
0.079%
0.073%
0.000%
0.003%
0.053%
1.333%
4.082%
0.685%
1.417%
2.300%
0.053%
0.070%
0.000%
0.001%
0.032%
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Contaminant
(MCL Concentration)
1,1-Dichloroethylene
(7 ug/L)
cis-1 ,2-Dichloroethylene
(70 ug/L)
trans-1 ,2-Dichloroethylene
(100|jg/L)
Dichloromethane (Methylene Chloride)
(5 ug/L)
1,2-Dichloropropane
(5 ug/L)
Ethylbenzene
(700 |jg/L)
Monochlorobenzene
(100|jg/L)
Styrene
(100|jg/L)
Tetrachloroethylene (PCE)
(5 ug/L)
Toluene
(1,000|jg/L)
1 ,2,4-Trichlorobenzene
(70 ug/L)
1,1,1-Trichloroethane
(200 |jg/L)
1,1,2-Trichloroethane
(5 ug/L)
Trichloroethylene (TCE)
(5 ug/L)
Vinyl Chloride
(2 Mg/L)
Xylenes (Total)
(1 0,000 |jg/L)
Percent of Sample Points
With
Detections
>MRL
0.711%
1.083%
0.143%
2.610%
0.320%
2.456%
0.166%
0.632%
3.189%
3.606%
0.182%
0.897%
0.119%
2.426%
0.281%
5.386%
With
Detections
> MCL
Concentration
0.082%
0.009%
0.000%
0.180%
0.014%
0.000%
0.000%
0.004%
0.522%
0.001%
0.000%
0.002%
0.012%
0.473%
0.048%
0.000%
Percent of Population-
Served by Sample Points
With
Detections
>MRL
1.540%
2.701%
0.479%
5.020%
0.727%
2.175%
0.725%
0.618%
4.489%
3.828%
0.372%
1.561%
0.386%
4.590%
0.712%
5.457%
With
Detections
> MCL
Concentration
0.227%
0.005%
0.000%
0.549%
0.080%
0.000%
0.000%
0.000%
1.212%
0.000%
0.000%
0.000%
0.007%
1 .452%
0.124%
0.000%
Radiological Contaminants
Alpha Particles
(15pCi/L)
Beta Particles
(screening level = 50 pCi/L)
Combined Radium-226 & -228
(original Radionuclides rule)
(5 pCi/L)
Combined Radium-226 & -228
(revised Radionuclides rule)
(5 pCi/L)
Uranium
(30 ug/L)
62.173%
68.192%
58.091%
66.595%
69.796%
4.022%
0.359%
7.239%
11.329%
6.759%
55.651%
75.894%
57.507%
48.258%
68.227%
1 .696%
0.347%
4.784%
4.729%
1.922%
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7 Stage 2 Analysis
The Stage 2 statistical analysis consists of estimates of long-term system mean
concentrations for 11 regulated SOCs and 11 regulated VOCs. These 22 contaminants are
referred to as "Category 1 contaminants" based on their: relatively high rates of occurrence at or
near concentration thresholds of concern; new or ongoing heath effects assessments, and;
potential new laboratory analytical capabilities. These 22 Category 1 contaminants are benzene,
carbofuran, carbon tetrachloride, chlordane, l,2-dibromo-3-chloropropane, 1,2-dichloroethane,
dichloromethane, 2,4-dichlorophenoxyacetic acid, 1,2-dichloropropane, endothall, heptachlor,
heptachlor epoxide, hexachlorobenzene, hexachlorocyclopentadiene, oxamyl,
tetrachloroethylene, toluene, toxaphene, 1,1,2-trichloroethane, trichloroethylene, vinyl chloride,
and xylenes (total).
Because the second Six-Year Review-ICR dataset is so much larger and more robust than
the dataset used for the for first Six-Year Review, it was possible here to use a simpler analytical
approach to estimate system means. For the second Six-Year Review, system means were
calculated using a simple arithmetic average of all detection and non-detection records for each
system. For the first Six-Year Review, the Stage 2 analysis consisted of Bayesian probabilistic
modeling to estimate long-term system means and the number of systems with means exceeding
certain contaminant concentration thresholds. All the first Six-Year Review occurrence analyses,
including the Stage 2 analysis Bayesian modeling, used occurrence data from the "16-State
National Cross-Section."
The Stage 2 analysis system contaminant mean estimates provide a less conservative
contaminant occurrence estimate than does the Stage 1 analysis, which is based on a single
maximum sample result exceeding a certain contaminant threshold. The Stage 2 analyses also
provide better occurrence estimates for contaminants for which chronic health effects are of
concern.
Calculating a contaminant arithmetic mean for each system required substituting a
numeric value for each non-detection record. This "simple substitution method" for substituting
numeric values for the non-detections is a straight-forward and standard data management
approach for this type of analysis (e.g., Helsel and Hirsch, 1991). Public water systems use this
approach for calculating annual, rolling four-quarter average contaminant concentrations and can
substitute zero for each sample non-detection record when generating average concentration
values. For the second Six-Year Review, three different substitution values -zero, one-half the
MRL value, and the full MRL value- were used to replace each non-detection record. Since the
true, but unknown, concentration of a contaminant for each non-detection is theoretically
between zero and the MRL, using a substitution value of zero for each non-detection would
generate a lower bound estimated average, substituting the full MRL would generate an upper
bound estimate and substituting the l/2 MRL value would generate a mid-range estimate. EPA
calculated three arithmetic means for each contaminant at each system using the zero, one-half
MRL and full MRL substitution values.
These system contaminant mean calculations were done for all systems with data in the
Six-Year Review-ICR dataset. Then, all system results were aggregated and the percent of all
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systems with a long-term mean concentration greater than each contaminant's MCL
concentration was calculated. The results from these Stage 2 analyses generated using the zero
substitution value are presented below in Exhibit 7-1. The results based on the system means
generated using the zero substitution value are equivalent to how states are authorized to
calculate system means for compliance determinations. The analogous Stage 2 analytical results
using the one-half and full MRL values are presented in Appendix B.
7.1 Summary of Occurrence Estimations
The Stage 2 analyses estimates are presented in Exhibit 7-1. For comparison, the Stage 1
results relative to the MCL concentration are also included. The estimates reflect the percentage
of systems, and population served by systems, with an estimated system contaminant mean
exceeding the respective MCL concentration for each contaminant. Note that these occurrence
measures relative to the MCL concentration are based on the system mean concentration over the
eight-year period of data in the second Six-Year Review-ICR dataset. Note: This does not
necessarily indicate an MCL violation. This differs from compliance assessments that calculate a
system mean concentration over four consecutive quarters. An MCL violation occurs when the
MCL is exceeded by the average results from four quarterly confirmation samples.
The Stage 2 occurrence estimates indicate a low portion of systems and population served
by systems with long-term contaminant means greater than the MCL concentrations. The five
contaminants exhibiting the highest Stage 2 occurrence estimates for the percent of systems with
long-term contaminant means greater than MCL concentration are l,2-dibromo-3-chloropropane
(0.112%), trichloroethylene (0.050%), tetrachloroethylene (0.046%), dichloromethane (0.026%),
and benzene (0.020%). The percent of population served by systems with long-term contaminant
means greater than MCL concentration, the five highest contaminants are tetrachloroethylene
(0.277%), trichloroethylene (0.181%), toxaphene (0.014%), l,2-dibromo-3-chloropropane
(0.013%), and benzene (0.006%).
Please see Appendix B for additional measures of contaminant occurrence based on the
Stage 2 analyses, including presentations of the numbers of systems and population served to
supplement the percent values presented in Exhibit 7-1. The appendix summary tables present
findings separately for ground water vs. surface water and present occurrence measures that
identify the total number of systems and total population served by systems with estimated
system contaminant means greater than the MCL concentration as well as many other thresholds.
Exhibit 7-1. Comparison of Stage 1 and Stage 2 Analytical Results - Percent of
Systems and Population Served by Systems Greater than the MCL Concentration
Contaminant
(MCL Concentration)
Percent of Systems
> MCL Concentration
Stage 1 1
(one detect
>MCL
Concentration)
Stage 2 2
(mean > MCL
Concentration)
Percent of Population Served by
Systems > MCL Concentration
Stage 1 1
(one detect
> MCL
Concentration)
Stage 2 2
(mean > MCL
Concentration)
Synthetic Organic Chemicals
Carbofuran
(40 Mg/L)
0.000%
0.000%
0.000%
0.000%
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Contaminant
(MCL Concentration)
Chlordane
(2 ug/L)
1 ,2-Dibromo-3-chloropropane
(DBCP)
2,4-Dichlorophenoxyacetic acid
(2,4-D)
Endothall
(100ug/L)
Heptachlor
(0.4 ug/L)
Heptachlor Epoxide
(0.2 ug/L)
Hexachlorobenzene
(1 Mg/L)
Hexachlorocyclopentadiene
(50 Mg/L)
Oxamyl (Vydate)
(200 M9/L)
Toxaphene
(3 M9/L)
Percent of Systems
> MCL Concentration
Stage 1 1
(one detect
>MCL
Concentration)
0.013%
0.388%
0.003%
0.021%
0.006%
0.018%
0.012%
0.000%
0.003%
0.016%
Stage 2 2
(mean > MCL
Concentration)
0.003%
0.112%
0.000%
0.000%
0.003%
0.003%
0.009%
0.000%
0.000%
0.010%
Percent of Population Served by
Systems > MCL Concentration
Stage 1 1
(one detect
> MCL
Concentration)
0.000%
1.627%
0.007%
0.063%
0.003%
0.010%
0.003%
0.000%
0.000%
0.017%
Stage 2 2
(mean > MCL
Concentration)
0.00004%
0.013%
0.000%
0.000%
0.0002%
0.0002%
0.001%
0.000%
0.000%
0.014%
Volatile Organic Chemicals
Benzene
(5 M9/L)
Carbon Tetrachloride
(5 M9/L)
1,2-Dichloroethane
(5 M9/L)
Dichloromethane (Methylene
Chloride)
1 ,2-Dichloropropane
(5 M9/L)
Tetrachloroethylene (PCE)
(5 M9/L)
Toluene
(1,000|jg/L)
1 , 1 ,2-Trichloroethane
(5 Mg/L)
Trichloroethylene (TCE)
(5 M9/L)
Vinyl Chloride
(2 Mg/L)
Xylenes (Total)
(10,000 ug/L)
0.125%
0.113%
0.071%
0.293%
0.020%
0.478%
0.002%
0.014%
0.387%
0.081%
0.000%
0.020%
0.010%
0.006%
0.026%
0.000%
0.046%
0.002%
0.000%
0.050%
0.016%
0.000%
0.215%
2.189%
0.193%
1.298%
0.155%
6.448%
0.000%
0.056%
5.264%
0.213%
0.000%
0.006%
0.001%
0.0001%
0.005%
0.000%
0.277%
0.000%
0.000%
0.181%
0.003%
0.000%
1. The Stage 1 results represent the percent of systems with at least one sample analytical result greater than a
contaminant's MCL concentration.
2. The Stage 2 results represent the percent of systems with an estimated long-term mean concentration greater than
a contaminant's MCL concentration. The Stage 2 results presented here are based on long-term means generated by
substituting zero for each non-detection record. For the Stage 2 results based on substituting the value of the full
MRL or V-i MRL (instead of zero), please refer to Appendix B.
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8 Summary of Findings
The Six-Year Review-ICR Dataset contains more than 15 million analytical records from
approximately 132,000 public water systems with data from 1998 to 2005 submitted by 45 states
and 2 primacy agencies. This dataset is the largest and most comprehensive compliance
monitoring dataset ever compiled and analyzed by EPA's Drinking Water Program. Using the
Six-Year Review-ICR Dataset, estimates of national occurrence in public drinking water systems
were made for 65 regulated chemical contaminants and 4 regulated radionuclide contaminants
with the Stage 1 analytical approach. Additional national occurrence estimates were made for 22
of the 65 regulated chemical contaminants with the Stage 2 analytical approach.
Based on the Stage 1 analysis of national population served by systems with at least one
sample analytical detection greater than each contaminant's MCL concentration, the lOCs had
occurrence as high as 7.310% (nitrate) and as low as 0.092% (barium).
The highest occurring SOC was di(2-ethylhexyl)phthalate with 6.397% of the population
served by systems reporting at least one sample analytical detection greater its MCL
concentration. l,2-Dibromo-3-chloropropane, atrazine, and ethylene dibromide also had high
percentages (more than 1%) of population served by systems with detections greater than their
respective MCL concentrations. On the low end of occurrence, seven SOCs -carbofuran, diquat,
glyphosate, hexachlorocyclopentadiene, methoxychlor, picloram and silvex- were not detected
above their respective MCL concentrations in any system nationally.
The highest occurring VOC was tetrachloroethylene with 6.448% of the population
served by systems reporting at least one sample analytical detection greater than its MCL
concentration. Trichloroethylene, 1,1-dichloroethylene, and carbon tetrachloride also had high
percentages (more than 2%) of population served by systems with detections greater than their
respective MCL concentrations. Six VOCs -1,2-dichlorobenzene, trans-1,2-dichloroethylene,
ethylbenzene, monochlorobenzene, 1,2,4-trichlorobenzene and total xylenes- were not detected
above their respective MCL concentrations in any systems nationally.
Based on the estimated percent of total population served by PWSs reporting at least one
detection greater than each contaminant's MCL concentration (in the case of beta particles,
screening level), the occurrence findings of the radionuclides is as follows: uranium (11.884%);
combined radium-226/-228 (9.620% pre-December 2003 and 9.201% post-December 2003);
alpha particles (6.208%), and; beta particles (1.228%).
Eleven SOCs and eleven VOCs were additionally assessed using the Stage 2 analytical
approach. Based on the population served by systems nationally with an estimated long-term
mean contaminant concentration greater than the respective MCL concentration, the SOCs had
occurrence as high as 0.014% (toxaphene) and as low as 0.000% (carbofuran, 2,4-
dichlorophenoxyacetic acid, endothall, hexachlorocyclopentadiene, and oxamyl). The two
highest occurring VOCs were tetrachloroethylene with 0.277% of the population served by
systems with a long-term mean greater than its MCL concentration, and trichloroethylene with
0.181% of the population served by systems with a long-term mean greater than its MCL
concentration. For three of the VOCs evaluated using the Stage 2 analysis -1,2-dichloropropane,
57 of 59
-------
EPA - OGWDW Analysis of Occurrence Data for the Second Six-Year Review ofNPDWRs EPA-815-B-09-006
Revised September 2010
1,1,2-trichloroethane, and total xylenes- no public water system nationally had an estimated
long-term mean greater than each contaminant's respective MCL concentration.
58 of 59
-------
EPA - OGWDW Analysis of Occurrence Data for the Second Six-Year Review ofNPDWRs EPA-815-B-09-006
Revised September 2010
9 References
Cadmus (The Cadmus Group, Inc.). 2008. The Data Management and Quality
Assurance/Quality Control Process Used to Edit the State Compliance Monitoring Datasets
Submitted for the Six-Year Review. Submitted to EPA on April 11, 2008.
Helsel, D.R., and R.M. Hirsch. 1991. "Statistical Methods in Water Resources," Chapter A3,
Book 4 of Techniques of Water-Resources Investigations of the United States Geologic Survey.
United States Environmental Protection Agency (USEPA). 2002. Analysis of National
Occurrence of the 1998 Contaminant Candidate List (CCL) Regulatory Determination Priority
Contaminants in Public Water Systems. EPA Report 815-D-01-002. May 2002.
USEPA. 2003a. National Primary Drinking Water Regulations; Announcement of Completion
of EPA's Review of Existing Drinking Water Standards. Federal Register: July 18, 2003,
Volume 68, Number 138, Page 42907-42929
USEPA. 2003b. Occurrence Estimation Methodology and Occurrence Findings for Six-Year
Review of National Primary Drinking Water Regulations. EPAReport 815-R-03-006, Office of
Water.
USEPA. 2003c. Drinking Water Baseline Handbook, Fourth Edition (Draft). September 4, 2003.
USEPA. 2006. Information Collection Request for Contaminant Occurrence Data in Support of
EPA's Second Six-Year Review of National Primary Drinking Water Regulations. ICR no.
2231.01. OMB Control No. 2040-0275.
USEPA. 2008a. The Analysis of Occurrence Data from the Unregulated Contaminant
Monitoring (UCM) Program and National Inorganics and Radionuclides Survey (NIRS) in
Support of Regulatory Determinations for the Second Drinking Water Contaminant Candidate
List. EPA Report 815-R-08-014. June 2008.
USEPA. 2008b. The Analysis of Occurrence Data from the First Unregulated Contaminant
Monitoring Regulation (UCMR 1) in Support of Regulatory Determinations for the Second
Drinking Water Contaminant Candidate List. EPA Report 815-R-08-013. June 2008.
USEPA. 2009a. Contaminant Occurrence Support Document for Category 1 Contaminants for
the Second Six-Year Review of National Primary Drinking Water Regulations. EPA Report 815-
B-09-010. October 2009.
USEPA. 2009b. Contaminant Occurrence Support Document for Category 2 Contaminants for
the Second Six-Year Review of National Primary Drinking Water Regulations. EPA Report 815-
B-09-011. October 2009.
59 of 59
-------
APPENDICES
The Analysis of Regulated Contaminant Occurrence Data from Public
Water Systems in Support of the Second Six-Year Review of National
Primary Drinking Water Regulations
Appendix A. Stage 1 Analysis Occurrence Measures for All
Regulated Contaminants
Appendix B. Stage 2 Analysis Occurrence Measures for Select
Regulated Contaminants
-------
Appendix A. Stage 1 Analysis Occurrence Measures
for All Regulated Contaminants
Table Al.
Table Ala.
Table Alb.
Table Ale.
Table Aid.
Table A2.
Table A2a.
Table A2b.
Table A2c.
Table A2d.
Table A3.
Table A3 a.
Table A3b.
Table A3c.
Table A3d.
Table A4.
Table A4a.
Table A4b.
Table A4c.
Table A4d.
Alachlor- Summary of the Stage 1
of interest are not necessarily MCL
Alachlor- Summary of the Stage 1
of interest are not necessarily MCL
Alachlor- Summary of the Stage 1
of interest are not necessarily MCL
Alachlor- Summary of the Stage 1
of interest are not necessarily MCL
Alachlor- Summary of the Stage 1
of interest are not necessarily MCL
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
Alpha Particles - Summary of the Stage 1
> threshold of interest are not necessarily
Alpha Particles - Summary of the Stage 1
> threshold of interest are not necessarily
Alpha Particles - Summary of the Stage 1
> threshold of interest are not necessarily
Alpha Particles - Summary of the Stage 1
> threshold of interest are not necessarily
Alpha Particles - Summary of the Stage 1
> threshold of interest are not necessarily
(Peak) Analyses (Single detections
MCL violations)
(Peak) Analyses (Single detections
MCL violations)
(Peak) Analyses (Single detections
MCL violations)
(Peak) Analyses (Single detections
MCL violations)
(Peak) Analyses (Single detections
MCL violations)
Antimony - Summary of the Stage
of interest are not necessarily MCL
Antimony - Summary of the Stage
of interest are not necessarily MCL
Antimony - Summary of the Stage
of interest are not necessarily MCL
Antimony - Summary of the Stage
of interest are not necessarily MCL
Antimony - Summary of the Stage
of interest are not necessarily MCL
1 (Peak) Analyses (Single detections > threshold
violations)
1 (Peak) Analyses (Single detections > threshold
violations)
1 (Peak) Analyses (Single detections > threshold
violations)
1 (Peak) Analyses (Single detections > threshold
violations)
1 (Peak) Analyses (Single detections > threshold
violations)
Arsenic - Summary of the
interest are not necessarily
Arsenic - Summary of the
interest are not necessarily
Arsenic - Summary of the
interest are not necessarily
Arsenic - Summary of the
interest are not necessarily
Arsenic - Summary of the
interest are not necessarily
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
-------
Table A4e.
Table A4f.
Table A5.
Table A5a.
Table A5b.
Table A5c.
Table A5d.
Table A6.
Table A6a.
Table A6b.
Table A6c.
Table A6d.
Table A7.
Table A7a.
Table A7b.
Table A7c.
Table A7d.
Table A8.
Table A8a.
Table A8b.
Table A8c.
Table A8d.
Arsenic - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Arsenic - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Asbestos - Summary of the Stage 1
of interest are not necessarily MCL
Asbestos - Summary of the Stage 1
of interest are not necessarily MCL
Asbestos - Summary of the Stage 1
of interest are not necessarily MCL
Asbestos - Summary of the Stage 1
of interest are not necessarily MCL
Asbestos - Summary of the Stage 1
of interest are not necessarily MCL
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
Atrazine - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Atrazine - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Atrazine - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Atrazine - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Atrazine - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Barium - Summary of the Stage
interest are not necessarily MCL
Barium - Summary of the Stage
interest are not necessarily MCL
Barium - Summary of the Stage
interest are not necessarily MCL
Barium - Summary of the Stage
interest are not necessarily MCL
Barium - Summary of the Stage
interest are not necessarily MCL
1 (Peak) Analyses (Single detections > threshold of
violations)
1 (Peak) Analyses (Single detections > threshold of
violations)
1 (Peak) Analyses (Single detections > threshold of
violations)
1 (Peak) Analyses (Single detections > threshold of
violations)
1 (Peak) Analyses (Single detections > threshold of
violations)
Benzene - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Benzene - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Benzene - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Benzene - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Benzene - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
-------
Table A8e.
Table A8f.
Table A9.
Table A9a.
Table A9b.
Table A9c.
Table A9d.
Table A10.
Table AlOa.
Table AlOb.
Table AlOc.
Table AlOd.
Table All.
Table All a.
Table Allb.
Table Allc.
Table Al Id.
Table A12.
Table A12a.
Table A12b.
Table A12c.
Table A12d.
Benzene - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Benzene - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Benzo(a)pyrene - Summary of the Stage
> threshold of interest are not necessarily
Benzo(a)pyrene - Summary of the Stage
> threshold of interest are not necessarily
Benzo(a)pyrene - Summary of the Stage
> threshold of interest are not necessarily
Benzo(a)pyrene - Summary of the Stage
> threshold of interest are not necessarily
Benzo(a)pyrene - Summary of the Stage
> threshold of interest are not necessarily
1 (Peak) Analyses (Single detections
MCL violations)
1 (Peak) Analyses (Single detections
MCL violations)
1 (Peak) Analyses (Single detections
MCL violations)
1 (Peak) Analyses (Single detections
MCL violations)
1 (Peak) Analyses (Single detections
MCL violations)
Beryllium - Summary of the Stage
of interest are not necessarily MCL
Beryllium - Summary of the Stage
of interest are not necessarily MCL
Beryllium - Summary of the Stage
of interest are not necessarily MCL
Beryllium - Summary of the Stage
of interest are not necessarily MCL
Beryllium - Summary of the Stage
of interest are not necessarily MCL
1 (Peak) Analyses (Single detections > threshold
violations)
1 (Peak) Analyses (Single detections > threshold
violations)
1 (Peak) Analyses (Single detections > threshold
violations)
1 (Peak) Analyses (Single detections > threshold
violations)
1 (Peak) Analyses (Single detections > threshold
violations)
Beta Particles - Summary
> threshold of interest are
Beta Particles - Summary
> threshold of interest are
Beta Particles - Summary
> threshold of interest are
Beta Particles - Summary
> threshold of interest are
Beta Particles - Summary
> threshold of interest are
of the Stage 1 (Peak) Analyses (Single detections
not necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single detections
not necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single detections
not necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single detections
not necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single detections
not necessarily MCL violations)
Cadmium - Summary of the Stage
of interest are not necessarily MCL
Cadmium - Summary of the Stage
of interest are not necessarily MCL
Cadmium - Summary of the Stage
of interest are not necessarily MCL
Cadmium - Summary of the Stage
of interest are not necessarily MCL
Cadmium - Summary of the Stage
of interest are not necessarily MCL
1 (Peak) Analyses (Single detections > threshold
violations)
1 (Peak) Analyses (Single detections > threshold
violations)
1 (Peak) Analyses (Single detections > threshold
violations)
1 (Peak) Analyses (Single detections > threshold
violations)
1 (Peak) Analyses (Single detections > threshold
violations)
-------
Table Al 3.
Table A13a.
Table A13b.
Table A13c.
Table A13d.
Table A13e.
Table A13f.
Table A14.
Table A14a.
Table A14b.
Table A14c.
Table A14d.
Table A14e.
Table A14f.
Table Al 5.
Table A15a.
Table A15b.
Table A15c.
Table A15d.
Table A16.
Table A16a.
Table A16b.
Table A16c.
Carbofuran - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Carbofuran - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Carbofuran - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Carbofuran - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Carbofuran - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Carbofuran - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Carbofuran - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Carbon Tetrachloride - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Carbon Tetrachloride - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Carbon Tetrachloride - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Carbon Tetrachloride - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Carbon Tetrachloride - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Carbon Tetrachloride - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Carbon Tetrachloride - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Chlordane - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold
of interest are not necessarily MCL violations)
Chlordane - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold
of interest are not necessarily MCL violations)
Chlordane - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold
of interest are not necessarily MCL violations)
Chlordane - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold
of interest are not necessarily MCL violations)
Chlordane - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold
of interest are not necessarily MCL violations)
Chromium (total) - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Chromium (total) - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Chromium (total) - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Chromium (total) - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
-------
Table A16d.
Table A17.
Table A17a.
Table AlTb.
Table A17c.
Table A17d.
Table Al 8.
Table A18a.
Table A18b.
Table A18c.
Table A18d.
Table A19.
Table A19a.
Table A19b.
Table 19c.
Table A19d.
Table A20.
Table A20a.
Table A20b.
Table A20c.
Table A20d.
Table A21.
Chromium (total) - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Cyanide - Summary of the
interest are not necessarily
Cyanide - Summary of the
interest are not necessarily
Cyanide - Summary of the
interest are not necessarily
Cyanide - Summary of the
interest are not necessarily
Cyanide - Summary of the
interest are not necessarily
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Dalapon - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Dalapon - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Dalapon - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Dalapon - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Dalapon - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Di(2-ethylhexyl)adipate - Summary
detections > threshold of interest are
Di(2-ethylhexyl)adipate - Summary
detections > threshold of interest are
Di(2-ethylhexyl)adipate - Summary
detections > threshold of interest are
Di(2-ethylhexyl)adipate - Summary
detections > threshold of interest are
Di(2-ethylhexyl)adipate - Summary
detections > threshold of interest are
of the Stage 1 (Peak) Analyses (Single
not necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single
not necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single
not necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single
not necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single
not necessarily MCL violations)
Di(2-ethylhexyl)phthalate - Summary of the Stage 1
detections > threshold of interest are not necessarily
Di(2-ethylhexyl)phthalate - Summary of the Stage 1
detections > threshold of interest are not necessarily
Di(2-ethylhexyl)phthalate - Summary of the Stage 1
detections > threshold of interest are not necessarily
Di(2-ethylhexyl)phthalate - Summary of the Stage 1
detections > threshold of interest are not necessarily
Di(2-ethylhexyl)phthalate - Summary of the Stage 1
detections > threshold of interest are not necessarily
(Peak) Analyses (Single
MCL violations)
(Peak) Analyses (Single
MCL violations)
(Peak) Analyses (Single
MCL violations)
(Peak) Analyses (Single
MCL violations)
(Peak) Analyses (Single
MCL violations)
l,2-Dibromo-3-chloropropane (DBCP) - Summary of the Stage 1 (Peak) Analyses
(Single detections > threshold of interest are not necessarily MCL violations)
-------
Table A2 la.
Table A21b.
Table A21c.
Table A2 Id.
Table A22.
Table A22a.
Table A22b.
Table A22c.
Table A22d.
Table A23.
Table A23a.
Table A23b.
Table A23c.
Table A23d.
Table A24.
Table A24a.
Table A24b.
Table A24c.
Table A24d.
Table A24e.
Table A24f.
Table A25.
l,2-Dibromo-3-chloropropane (DBCP) -
(Single detections > threshold of interest
l,2-Dibromo-3-chloropropane (DBCP) -
(Single detections > threshold of interest
l,2-Dibromo-3-chloropropane (DBCP) -
(Single detections > threshold of interest
l,2-Dibromo-3-chloropropane (DBCP) -
(Single detections > threshold of interest
Summary of the Stage 1
are not necessarily MCL
Summary of the Stage 1
are not necessarily MCL
Summary of the Stage 1
are not necessarily MCL
Summary of the Stage 1
are not necessarily MCL
(Peak) Analyses
violations)
(Peak) Analyses
violations)
(Peak) Analyses
violations)
(Peak) Analyses
violations)
1,2-Dichlorobenzene -
> threshold of interest
1,2-Dichlorobenzene -
> threshold of interest
1,2-Dichlorobenzene -
> threshold of interest
1,2-Dichlorobenzene -
> threshold of interest
1,2-Dichlorobenzene -
> threshold of interest
1,4-Dichlorobenzene -
> threshold of interest
1,4-Dichlorobenzene -
> threshold of interest
1,4-Dichlorobenzene -
> threshold of interest
1,4-Dichlorobenzene -
> threshold of interest
1,4-Dichlorobenzene -
> threshold of interest
- Summary of the Stage 1
are not necessarily MCL
- Summary of the Stage 1
are not necessarily MCL
- Summary of the Stage 1
are not necessarily MCL
- Summary of the Stage 1
are not necessarily MCL
- Summary of the Stage 1
are not necessarily MCL
- Summary of the Stage 1
are not necessarily MCL
- Summary of the Stage 1
are not necessarily MCL
- Summary of the Stage 1
are not necessarily MCL
- Summary of the Stage 1
are not necessarily MCL
- Summary of the Stage 1
are not necessarily MCL
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
1,2-Dichloroethane - Summary of the Stage 1 (Peak) Analyses
> threshold of interest are not necessarily MCL violations)
1,2-Dichloroethane - Summary of the Stage 1 (Peak) Analyses
> threshold of interest are not necessarily MCL violations)
1,2-Dichloroethane - Summary of the Stage 1 (Peak) Analyses
> threshold of interest are not necessarily MCL violations)
1,2-Dichloroethane - Summary of the Stage 1 (Peak) Analyses
> threshold of interest are not necessarily MCL violations)
1,2-Dichloroethane - Summary of the Stage 1 (Peak) Analyses
> threshold of interest are not necessarily MCL violations)
1,2-Dichloroethane - Summary of the Stage 1 (Peak) Analyses
> threshold of interest are not necessarily MCL violations)
1,2-Dichloroethane - Summary of the Stage 1 (Peak) Analyses
> threshold of interest are not necessarily MCL violations)
(Single detections
(Single detections
(Single detections
(Single detections
(Single detections
(Single detections
(Single detections
1,1-Dichloroethylene - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
-------
Table A25a.
Table A25b.
Table A25c.
Table A25d.
Table A26.
Table A26a.
Table A26b.
Table A26c.
Table A26d.
Table A27.
Table A27a.
Table A27b.
Table A27c.
Table A27d.
Table A28.
Table A28a.
Table A28b.
Table A28c.
Table A28d.
Table A28e.
Table A28f.
Table A29.
1,1 -Dichloroethylene -
> threshold of interest
1,1 -Dichloroethylene -
> threshold of interest
1,1 -Dichloroethylene -
> threshold of interest
1,1 -Dichloroethylene -
> threshold of interest
- Summary of the Stage 1 (Peak) Analyses (Single detections
are not necessarily MCL violations)
- Summary of the Stage 1 (Peak) Analyses (Single detections
are not necessarily MCL violations)
- Summary of the Stage 1 (Peak) Analyses (Single detections
are not necessarily MCL violations)
- Summary of the Stage 1 (Peak) Analyses (Single detections
are not necessarily MCL violations)
cis-l,2-Dichloroethylene - Summary of the Stage 1
detections > threshold of interest are not necessarily
cis-l,2-Dichloroethylene - Summary of the Stage 1
detections > threshold of interest are not necessarily
cis-l,2-Dichloroethylene - Summary of the Stage 1
detections > threshold of interest are not necessarily
cis-l,2-Dichloroethylene - Summary of the Stage 1
detections > threshold of interest are not necessarily
cis-l,2-Dichloroethylene - Summary of the Stage 1
detections > threshold of interest are not necessarily
trans-1,2-Dichloroethylene - Summary of the Stage
detections > threshold of interest are not necessarily
trans-1,2-Dichloroethylene - Summary of the Stage
detections > threshold of interest are not necessarily
trans-1,2-Dichloroethylene - Summary of the Stage
detections > threshold of interest are not necessarily
trans-1,2-Dichloroethylene - Summary of the Stage
detections > threshold of interest are not necessarily
trans-1,2-Dichloroethylene - Summary of the Stage
detections > threshold of interest are not necessarily
(Peak) Analyses (Single
MCL violations)
(Peak) Analyses (Single
MCL violations)
(Peak) Analyses (Single
MCL violations)
(Peak) Analyses (Single
MCL violations)
(Peak) Analyses (Single
MCL violations)
1 (Peak) Analyses (Single
MCL violations)
1 (Peak) Analyses (Single
MCL violations)
1 (Peak) Analyses (Single
MCL violations)
1 (Peak) Analyses (Single
MCL violations)
1 (Peak) Analyses (Single
MCL violations)
Dichloromethane - Summary
> threshold of interest are not
Dichloromethane - Summary
> threshold of interest are not
Dichloromethane - Summary
> threshold of interest are not
Dichloromethane - Summary
> threshold of interest are not
Dichloromethane - Summary
> threshold of interest are not
Dichloromethane - Summary
> threshold of interest are not
Dichloromethane - Summary
> threshold of interest are not
of the Stage 1 (Peak) Analyses
necessarily MCL violations)
of the Stage 1 (Peak) Analyses
necessarily MCL violations)
of the Stage 1 (Peak) Analyses
necessarily MCL violations)
of the Stage 1 (Peak) Analyses
necessarily MCL violations)
of the Stage 1 (Peak) Analyses
necessarily MCL violations)
of the Stage 1 (Peak) Analyses
necessarily MCL violations)
of the Stage 1 (Peak) Analyses
necessarily MCL violations)
(Single detections
(Single detections
(Single detections
(Single detections
(Single detections
(Single detections
(Single detections
2,4-Dichlorophenoxyacetic Acid - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
-------
Table A29a.
Table A29b.
Table A29c.
Table A29d.
Table A29e.
Table A30.
Table A30a.
Table A3 Ob.
Table A30c.
Table A30d.
Table A30e.
Table A3 Of.
Table A31.
Table A3 la.
Table A3 Ib.
Table A3 Ic.
Table A3 Id.
Table A32.
Table A32a.
Table A32b.
Table A32c.
Table A32d.
2,4-Dichlorophenoxyacetic Acid
detections > threshold of interest
2,4-Dichlorophenoxyacetic Acid
detections > threshold of interest
2,4-Dichlorophenoxyacetic Acid
detections > threshold of interest
2,4-Dichlorophenoxyacetic Acid
detections > threshold of interest
2,4-Dichlorophenoxyacetic Acid
detections > threshold of interest
- Summary of the Stage
are not necessarily MCL
- Summary of the Stage
are not necessarily MCL
- Summary of the Stage
are not necessarily MCL
- Summary of the Stage
are not necessarily MCL
- Summary of the Stage
are not necessarily MCL
1 (Peak) Analyses (Single
violations)
1 (Peak) Analyses (Single
violations)
1 (Peak) Analyses (Single
violations)
1 (Peak) Analyses (Single
violations)
1 (Peak) Analyses (Single
violations)
1,2-Dichloropropane -
> threshold of interest
1,2-Dichloropropane -
> threshold of interest
1,2-Dichloropropane -
> threshold of interest
1,2-Dichloropropane -
> threshold of interest
1,2-Dichloropropane -
> threshold of interest
1,2-Dichloropropane -
> threshold of interest
1,2-Dichloropropane -
> threshold of interest
- Summary of the Stage 1
are not necessarily MCL
- Summary of the Stage 1
are not necessarily MCL
- Summary of the Stage 1
are not necessarily MCL
- Summary of the Stage 1
are not necessarily MCL
- Summary of the Stage 1
are not necessarily MCL
- Summary of the Stage 1
are not necessarily MCL
- Summary of the Stage 1
are not necessarily MCL
(Peak) Analyses
violations)
(Peak) Analyses
violations)
(Peak) Analyses
violations)
(Peak) Analyses
violations)
(Peak) Analyses
violations)
(Peak) Analyses
violations)
(Peak) Analyses
violations)
(Single detections
(Single detections
(Single detections
(Single detections
(Single detections
(Single detections
(Single detections
Dinoseb - Summary of the
interest are not necessarily
Dinoseb - Summary of the
interest are not necessarily
Dinoseb - Summary of the
interest are not necessarily
Dinoseb - Summary of the
interest are not necessarily
Dinoseb - Summary of the
interest are not necessarily
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Diquat - Summary of the Stage 1
interest are not necessarily MCL
Diquat - Summary of the Stage 1
interest are not necessarily MCL
Diquat - Summary of the Stage 1
interest are not necessarily MCL
Diquat - Summary of the Stage 1
interest are not necessarily MCL
Diquat - Summary of the Stage 1
interest are not necessarily MCL
(Peak) Analyses (Single detections > threshold of
violations)
(Peak) Analyses (Single detections > threshold of
violations)
(Peak) Analyses (Single detections > threshold of
violations)
(Peak) Analyses (Single detections > threshold of
violations)
(Peak) Analyses (Single detections > threshold of
violations)
-------
Table A33.
Table A33a.
Table A33b.
Table A33c.
Table A3 3d.
Table A34.
Table A34a.
Table A34b.
Table A34c.
Table A34d.
Table A3 5.
Table A35a.
Table A3 5b.
Table A35c.
Table A35d.
Table A36.
Table A36a.
Table A36b.
Table A36c.
Table A36d.
Table A37.
Table A37a.
Endothall - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold
of interest are not necessarily MCL violations)
Endothall - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold
of interest are not necessarily MCL violations)
Endothall - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold
of interest are not necessarily MCL violations)
Endothall - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold
of interest are not necessarily MCL violations)
Endothall - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold
of interest are not necessarily MCL violations)
Endrin - Summary of the Stage 1
interest are not necessarily MCL
Endrin - Summary of the Stage 1
interest are not necessarily MCL
Endrin - Summary of the Stage 1
interest are not necessarily MCL
Endrin - Summary of the Stage 1
interest are not necessarily MCL
Endrin - Summary of the Stage 1
interest are not necessarily MCL
(Peak) Analyses (Single detections > threshold of
violations)
(Peak) Analyses (Single detections > threshold of
violations)
(Peak) Analyses (Single detections > threshold of
violations)
(Peak) Analyses (Single detections > threshold of
violations)
(Peak) Analyses (Single detections > threshold of
violations)
Ethylbenzene - Summary of the Stage
threshold of interest are not necessarily
Ethylbenzene - Summary of the Stage
threshold of interest are not necessarily
Ethylbenzene - Summary of the Stage
threshold of interest are not necessarily
Ethylbenzene - Summary of the Stage
threshold of interest are not necessarily
Ethylbenzene - Summary of the Stage
threshold of interest are not necessarily
1 (Peak) Analyses (Single detections >
MCL violations)
1 (Peak) Analyses (Single detections >
MCL violations)
1 (Peak) Analyses (Single detections >
MCL violations)
1 (Peak) Analyses (Single detections >
MCL violations)
1 (Peak) Analyses (Single detections >
MCL violations)
Ethylene Dibromide -
> threshold of interest
Ethylene Dibromide -
> threshold of interest
Ethylene Dibromide -
> threshold of interest
Ethylene Dibromide -
> threshold of interest
Ethylene Dibromide -
> threshold of interest
Summary of the Stage 1
are not necessarily MCL
Summary of the Stage 1
are not necessarily MCL
Summary of the Stage 1
are not necessarily MCL
Summary of the Stage 1
are not necessarily MCL
Summary of the Stage 1
are not necessarily MCL
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
Fluoride - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Fluoride - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
-------
Table A37b.
Table A37c.
Table A37d.
Table A3 8.
Table A3 8a.
Table A3 8b.
Table A3 8c.
Table A3 8d.
Table A39.
Table A39a.
Table A39b.
Table A39c.
Table A39d.
Table A39e.
Table A40.
Table A40a.
Table A40b.
Table A40c.
Table A40d.
Table A41.
Table A4la.
Table A41b.
Fluoride - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Fluoride - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Fluoride - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of
interest are not necessarily MCL violations)
Glyphosate - Summary
threshold of interest are
Glyphosate - Summary
threshold of interest are
Glyphosate - Summary
threshold of interest are
Glyphosate - Summary
threshold of interest are
Glyphosate - Summary
threshold of interest are
of the Stage 1 (Peak)
not necessarily MCL
of the Stage 1 (Peak)
not necessarily MCL
of the Stage 1 (Peak)
not necessarily MCL
of the Stage 1 (Peak)
not necessarily MCL
of the Stage 1 (Peak)
not necessarily MCL
Analyses (Single detections >
violations)
Analyses (Single detections >
violations)
Analyses (Single detections >
violations)
Analyses (Single detections >
violations)
Analyses (Single detections >
violations)
Heptachlor- Summary of the
of interest are not necessarily
Heptachlor- Summary of the
of interest are not necessarily
Heptachlor- Summary of the
of interest are not necessarily
Heptachlor- Summary of the
of interest are not necessarily
Heptachlor- Summary of the
of interest are not necessarily
Heptachlor- Summary of the
of interest are not necessarily
Stage 1 (Peak) Analyses (Single detections > threshold
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold
MCL violations)
Heptachlor Epoxide -
> threshold of interest
Heptachlor Epoxide -
> threshold of interest
Heptachlor Epoxide -
> threshold of interest
Heptachlor Epoxide -
> threshold of interest
Heptachlor Epoxide -
> threshold of interest
Summary of the Stage 1 (Peak) Analyses (Single detections
are not necessarily MCL violations)
Summary of the Stage 1 (Peak) Analyses (Single detections
are not necessarily MCL violations)
Summary of the Stage 1 (Peak) Analyses (Single detections
are not necessarily MCL violations)
Summary of the Stage 1 (Peak) Analyses (Single detections
are not necessarily MCL violations)
Summary of the Stage 1 (Peak) Analyses (Single detections
are not necessarily MCL violations)
Hexachlorobenzene - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Hexachlorobenzene - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Hexachlorobenzene - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
-------
Table A41c.
Table A4 Id.
Table A41e.
Table A42.
Table A42a.
Table A42b.
Table A42c.
Table A42d.
Table A42e.
Table A43.
Table A43a.
Table A43b.
Table A43c.
Table A43d.
Table A44.
Table A44a.
Table A44b.
Table A44c.
Table A44d.
Hexachlorobenzene - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Hexachlorobenzene - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Hexachlorobenzene - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Hexachlorocyclopentadiene - Summary
detections > threshold of interest are not
Hexachlorocyclopentadiene - Summary
detections > threshold of interest are not
Hexachlorocyclopentadiene - Summary
detections > threshold of interest are not
Hexachlorocyclopentadiene - Summary
detections > threshold of interest are not
Hexachlorocyclopentadiene - Summary
detections > threshold of interest are not
Hexachlorocyclopentadiene - Summary
detections > threshold of interest are not
of the Stage 1 (Peak) Analyses (Single
necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single
necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single
necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single
necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single
necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single
necessarily MCL violations)
Lindane (gamma-
Analyses (Single
violations)
Lindane (gamma-
Analyses (Single
violations)
Lindane (gamma-
Analyses (Single
violations)
Lindane (gamma-
Analyses (Single
violations)
Lindane (gamma-
Analyses (Single
violations)
•Hexachlorocyclohexane) - Summary of the Stage 1 (Peak)
detections > threshold of interest are not necessarily MCL
•Hexachlorocyclohexane) - Summary of the Stage 1 (Peak)
detections > threshold of interest are not necessarily MCL
•Hexachlorocyclohexane) - Summary of the Stage 1 (Peak)
detections > threshold of interest are not necessarily MCL
•Hexachlorocyclohexane) - Summary of the Stage 1 (Peak)
detections > threshold of interest are not necessarily MCL
•Hexachlorocyclohexane) - Summary of the Stage 1 (Peak)
detections > threshold of interest are not necessarily MCL
Mercury (Inorganic) -
> threshold of interest
Mercury (Inorganic) -
> threshold of interest
Mercury (Inorganic) -
> threshold of interest
Mercury (Inorganic) -
> threshold of interest
Mercury (Inorganic) -
> threshold of interest
Summary of the Stage 1
are not necessarily MCL
Summary of the Stage 1
are not necessarily MCL
Summary of the Stage 1
are not necessarily MCL
Summary of the Stage 1
are not necessarily MCL
Summary of the Stage 1
are not necessarily MCL
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
(Peak) Analyses (Single detections
violations)
-------
Table A45.
Table A45a.
Table A45b.
Table A45c.
Table A45d.
Table A46.
Table A46a.
Table A46b.
Table A46c.
Table A46d.
Table A47.
Table A47a.
Table A47b.
Table A47c.
Table A47d.
Table A48.
Table A48a.
Table A48b.
Table A48c.
Table A48d.
Table A49.
Table A49a.
Methoxychlor - Summary of the Stage 1
> threshold of interest are not necessarily
Methoxychlor- Summary of the Stage 1
> threshold of interest are not necessarily
Methoxychlor- Summary of the Stage 1
> threshold of interest are not necessarily
Methoxychlor- Summary of the Stage 1
> threshold of interest are not necessarily
Methoxychlor- Summary of the Stage 1
> threshold of interest are not necessarily
(Peak) Analyses (Single detections
MCL violations)
(Peak) Analyses (Single detections
MCL violations)
(Peak) Analyses (Single detections
MCL violations)
(Peak) Analyses (Single detections
MCL violations)
(Peak) Analyses (Single detections
MCL violations)
Monochlorobenzene -
> threshold of interest
Monochlorobenzene -
> threshold of interest
Monochlorobenzene -
> threshold of interest
Monochlorobenzene -
> threshold of interest
Monochlorobenzene -
> threshold of interest
Summary of the Stage 1
are not necessarily MCL
Summary of the Stage 1
are not necessarily MCL
Summary of the Stage 1
are not necessarily MCL
Summary of the Stage 1
are not necessarily MCL
Summary of the Stage 1
are not necessarily MCL
(Peak) Analyses
violations)
(Peak) Analyses
violations)
(Peak) Analyses
violations)
(Peak) Analyses
violations)
(Peak) Analyses
violations)
(Single detections
(Single detections
(Single detections
(Single detections
(Single detections
Nitrate (as N) - Summary
> threshold of interest are
Nitrate (as N) - Summary
> threshold of interest are
Nitrate (as N) - Summary
> threshold of interest are
Nitrate (as N) - Summary
> threshold of interest are
Nitrate (as N) - Summary
> threshold of interest are
of the Stage 1 (Peak)
not necessarily MCL
of the Stage 1 (Peak)
not necessarily MCL
of the Stage 1 (Peak)
not necessarily MCL
of the Stage 1 (Peak)
not necessarily MCL
of the Stage 1 (Peak)
not necessarily MCL
Analyses (Single detections
violations)
Analyses (Single detections
violations)
Analyses (Single detections
violations)
Analyses (Single detections
violations)
Analyses (Single detections
violations)
Nitrite (as N) - Summary of the Stage 1
threshold of interest are not necessarily
Nitrite (as N) - Summary of the Stage 1
threshold of interest are not necessarily
Nitrite (as N) - Summary of the Stage 1
threshold of interest are not necessarily
Nitrite (as N) - Summary of the Stage 1
threshold of interest are not necessarily
Nitrite (as N) - Summary of the Stage 1
threshold of interest are not necessarily
(Peak) Analyses (Single detections >
MCL violations)
(Peak) Analyses (Single detections >
MCL violations)
(Peak) Analyses (Single detections >
MCL violations)
(Peak) Analyses (Single detections >
MCL violations)
(Peak) Analyses (Single detections >
MCL violations)
Oxamyl (Vydate) - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Oxamyl (Vydate) - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
-------
Table A49b.
Table A49c.
Table A49d.
Table A49e.
Table A50.
Table A50a.
Table A50b.
Table A50c.
Table A50d.
Table A51.
Table A5 la.
Table A51b.
Table A51c.
Table A5 Id.
Table A52.
Table A52a.
Table A52b.
Table A52c.
Table A52d.
Oxamyl (Vydate) - Summary
> threshold of interest are not
Oxamyl (Vydate) - Summary
> threshold of interest are not
Oxamyl (Vydate) - Summary
> threshold of interest are not
Oxamyl (Vydate) - Summary
> threshold of interest are not
of the Stage 1 (Peak) Analyses (Single detections
necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single detections
necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single detections
necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single detections
necessarily MCL violations)
Pentachlorophenol - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Pentachlorophenol - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Pentachlorophenol - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Pentachlorophenol - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Pentachlorophenol - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Picloram - Summary of the Stage 1
of interest are not necessarily MCL
Picloram - Summary of the Stage 1
of interest are not necessarily MCL
Picloram - Summary of the Stage 1
of interest are not necessarily MCL
Picloram - Summary of the Stage 1
of interest are not necessarily MCL
Picloram - Summary of the Stage 1
of interest are not necessarily MCL
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
Polychlorinated Biphenyls (PCBs) - Summary of the Stage
(Single detections > threshold of interest are not necessarily
Polychlorinated Biphenyls (PCBs) - Summary of the Stage
(Single detections > threshold of interest are not necessarily
Polychlorinated Biphenyls (PCBs) - Summary of the Stage
(Single detections > threshold of interest are not necessarily
Polychlorinated Biphenyls (PCBs) - Summary of the Stage
(Single detections > threshold of interest are not necessarily
Polychlorinated Biphenyls (PCBs) - Summary of the Stage
(Single detections > threshold of interest are not necessarily
1 (Peak) Analyses
MCL violations)
1 (Peak) Analyses
MCL violations)
1 (Peak) Analyses
MCL violations)
1 (Peak) Analyses
MCL violations)
1 (Peak) Analyses
MCL violations)
Table A53 (Original Rule). Combined Radium - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
Table A53a (Original Rule). Combined Radium - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
Table A53b (Original Rule). Combined Radium - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
-------
Table A53c (Original Rule).
Table A53d (Original Rule).
Table A53 (Revised Rule).
Table A53a (Revised Rule).
Table A53b (Revised Rule).
Table A53c (Revised Rule).
Table A53d (Revised Rule).
Combined Radium - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
Combined Radium - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
Combined Radium - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
Combined Radium - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
Combined Radium - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
Combined Radium - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
Combined Radium - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
Table A54.
Table A54a.
Table A54b.
Table A54c.
Table A54d.
Table A55.
Table A55a.
Table A55b.
Table A55c.
Table A55d.
Table A56.
Table A56a.
Table A56b.
Table A56c.
Table A56d.
Selenium - Summary of the Stage 1
of interest are not necessarily MCL
Selenium - Summary of the Stage 1
of interest are not necessarily MCL
Selenium - Summary of the Stage 1
of interest are not necessarily MCL
Selenium - Summary of the Stage 1
of interest are not necessarily MCL
Selenium - Summary of the Stage 1
of interest are not necessarily MCL
Simazine - Summary of the Stage 1
of interest are not necessarily MCL
Simazine - Summary of the Stage 1
of interest are not necessarily MCL
Simazine - Summary of the Stage 1
of interest are not necessarily MCL
Simazine - Summary of the Stage 1
of interest are not necessarily MCL
Simazine - Summary of the Stage 1
of interest are not necessarily MCL
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
Styrene - Summary of the Stage
interest are not necessarily MCL
Styrene - Summary of the Stage
interest are not necessarily MCL
Styrene - Summary of the Stage
interest are not necessarily MCL
Styrene - Summary of the Stage
interest are not necessarily MCL
Styrene - Summary of the Stage
interest are not necessarily MCL
1 (Peak) Analyses (Single detections > threshold of
violations)
1 (Peak) Analyses (Single detections > threshold of
violations)
1 (Peak) Analyses (Single detections > threshold of
violations)
1 (Peak) Analyses (Single detections > threshold of
violations)
1 (Peak) Analyses (Single detections > threshold of
violations)
-------
Table A57.
Table A57a.
Table A57b.
Table A57c.
Table A57d.
Table A58.
Table A58a.
Table A58b.
Table A58c.
Table A58d.
Table A58e.
Table A58f.
Table A59.
Table A59a.
Table A59b.
Table A59c.
Table A59d.
Table A60.
Table A60a.
Table A60b.
Table A60c.
Table A60d.
Table A60e.
2,3,7,8-TCDD (Dioxin) - Summary
detections > threshold of interest are
2,3,7,8-TCDD (Dioxin) - Summary
detections > threshold of interest are
2,3,7,8-TCDD (Dioxin) - Summary
detections > threshold of interest are
2,3,7,8-TCDD (Dioxin) - Summary
detections > threshold of interest are
2,3,7,8-TCDD (Dioxin) - Summary
detections > threshold of interest are
of the Stage 1 (Peak) Analyses (Single
not necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single
not necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single
not necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single
not necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single
not necessarily MCL violations)
Tetrachloroethylene (PCE) - Summary of the Stage
detections > threshold of interest are not necessarily
Tetrachloroethylene (PCE) - Summary of the Stage
detections > threshold of interest are not necessarily
Tetrachloroethylene (PCE) - Summary of the Stage
detections > threshold of interest are not necessarily
Tetrachloroethylene (PCE) - Summary of the Stage
detections > threshold of interest are not necessarily
Tetrachloroethylene (PCE) - Summary of the Stage
detections > threshold of interest are not necessarily
Tetrachloroethylene (PCE) - Summary of the Stage
detections > threshold of interest are not necessarily
Tetrachloroethylene (PCE) - Summary of the Stage
detections > threshold of interest are not necessarily
1 (Peak) Analyses (Single
MCL violations)
1 (Peak) Analyses (Single
MCL violations)
1 (Peak) Analyses (Single
MCL violations)
1 (Peak) Analyses (Single
MCL violations)
1 (Peak) Analyses (Single
MCL violations)
1 (Peak) Analyses (Single
MCL violations)
1 (Peak) Analyses (Single
MCL violations)
Thallium - Summary of the Stage 1
of interest are not necessarily MCL
Thallium - Summary of the Stage 1
of interest are not necessarily MCL
Thallium - Summary of the Stage 1
of interest are not necessarily MCL
Thallium - Summary of the Stage 1
of interest are not necessarily MCL
Thallium - Summary of the Stage 1
of interest are not necessarily MCL
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
Toluene - Summary of the
interest are not necessarily
Toluene - Summary of the
interest are not necessarily
Toluene - Summary of the
interest are not necessarily
Toluene - Summary of the
interest are not necessarily
Toluene - Summary of the
interest are not necessarily
Toluene - Summary of the
interest are not necessarily
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
Stage 1 (Peak) Analyses (Single detections > threshold of
MCL violations)
-------
Table A61.
Table A6 la.
Table A61b.
Table A61c.
Table A6 Id.
Table A61e.
Table A62.
Table A62a.
Table A62b.
Table A62c.
Table A62d.
Table A63.
Table A63a.
Table A63b.
Table A63c.
Table A63d.
Table A64.
Table A64a.
Table A64b.
Table A64c.
Table A64d.
Table A64e.
Toxaphene - Summary of the
of interest are not necessarily
Toxaphene - Summary of the
of interest are not necessarily
Toxaphene - Summary of the
of interest are not necessarily
Toxaphene - Summary of the
of interest are not necessarily
Toxaphene - Summary of the
of interest are not necessarily
Toxaphene - Summary of the
of interest are not necessarily
Stage 1 (Peak) Analyses (Single detections >
MCL violations)
Stage 1 (Peak) Analyses (Single detections >
MCL violations)
Stage 1 (Peak) Analyses (Single detections >
MCL violations)
Stage 1 (Peak) Analyses (Single detections >
MCL violations)
Stage 1 (Peak) Analyses (Single detections >
MCL violations)
Stage 1 (Peak) Analyses (Single detections >
MCL violations)
threshold
threshold
threshold
threshold
threshold
threshold
1,2,4-Trichlorobenzene - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
1,2,4-Trichlorobenzene - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
1,2,4-Trichlorobenzene - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
1,2,4-Trichlorobenzene - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
1,2,4-Trichlorobenzene - Summary of the Stage 1 (Peak) Analyses (Single
detections > threshold of interest are not necessarily MCL violations)
1,1,1 -Trichloroethane
> threshold of interest
1,1,1 -Trichloroethane
> threshold of interest
1,1,1 -Trichloroethane
> threshold of interest
1,1,1 -Trichloroethane
> threshold of interest
1,1,1 -Trichloroethane
> threshold of interest
1,1,2-Trichloroethane
> threshold of interest
1,1,2-Trichloroethane
> threshold of interest
1,1,2-Trichloroethane
> threshold of interest
1,1,2-Trichloroethane
> threshold of interest
1,1,2-Trichloroethane
> threshold of interest
1,1,2-Trichloroethane
> threshold of interest
- Summary of the Stage
are not necessarily MCL
- Summary of the Stage
are not necessarily MCL
- Summary of the Stage
are not necessarily MCL
- Summary of the Stage
are not necessarily MCL
- Summary of the Stage
are not necessarily MCL
- Summary of the Stage
are not necessarily MCL
- Summary of the Stage
are not necessarily MCL
- Summary of the Stage
are not necessarily MCL
- Summary of the Stage
are not necessarily MCL
- Summary of the Stage
are not necessarily MCL
- Summary of the Stage
are not necessarily MCL
1 (Peak) Analyses (Single detections
violations)
1 (Peak) Analyses (Single detections
violations)
1 (Peak) Analyses (Single detections
violations)
1 (Peak) Analyses (Single detections
violations)
1 (Peak) Analyses (Single detections
violations)
1 (Peak) Analyses (Single detections
violations)
1 (Peak) Analyses (Single detections
violations)
1 (Peak) Analyses (Single detections
violations)
1 (Peak) Analyses (Single detections
violations)
1 (Peak) Analyses (Single detections
violations)
1 (Peak) Analyses (Single detections
violations)
-------
Table A65.
Table A65a.
Table A65b.
Table A65c.
Table A65d.
Table A66.
Table A66a.
Table A66b.
Table A66c.
Table A66d.
Table A66e.
Table A66f.
Table A67.
Table A67a.
Table A67b.
Table A67c.
Table A67d.
Table A68.
Table A68a.
Table A68b.
2,4,5-Trichlorophenoxypropionic acid (Silvex) - Summary of the Stage 1 (Peak)
Analyses (Single detections > threshold of interest are not necessarily MCL
violations)
2,4,5-Trichlorophenoxypropionic acid (Silvex) - Summary of the Stage 1 (Peak)
Analyses (Single detections > threshold of interest are not necessarily MCL
violations)
2,4,5-Trichlorophenoxypropionic acid (Silvex) - Summary of the Stage 1 (Peak)
Analyses (Single detections > threshold of interest are not necessarily MCL
violations)
2,4,5-Trichlorophenoxypropionic acid (Silvex) - Summary of the Stage 1 (Peak)
Analyses (Single detections > threshold of interest are not necessarily MCL
violations)
2,4,5-Trichlorophenoxypropionic acid (Silvex) - Summary of the Stage 1 (Peak)
Analyses (Single detections > threshold of interest are not necessarily MCL
violations)
Trichloroethylene (TCE) - Summary of the Stage 1
detections > threshold of interest are not necessarily
Trichloroethylene (TCE) - Summary of the Stage 1
detections > threshold of interest are not necessarily
Trichloroethylene (TCE) - Summary of the Stage 1
detections > threshold of interest are not necessarily
Trichloroethylene (TCE) - Summary of the Stage 1
detections > threshold of interest are not necessarily
Trichloroethylene (TCE) - Summary of the Stage 1
detections > threshold of interest are not necessarily
Trichloroethylene (TCE) - Summary of the Stage 1
detections > threshold of interest are not necessarily
Trichloroethylene (TCE) - Summary of the Stage 1
detections > threshold of interest are not necessarily
(Peak) Analyses (Single
MCL violations)
(Peak) Analyses (Single
MCL violations)
(Peak) Analyses (Single
MCL violations)
(Peak) Analyses (Single
MCL violations)
(Peak) Analyses (Single
MCL violations)
(Peak) Analyses (Single
MCL violations)
(Peak) Analyses (Single
MCL violations)
Uranium - Summary of the Stage 1
of interest are not necessarily MCL
Uranium - Summary of the Stage 1
of interest are not necessarily MCL
Uranium - Summary of the Stage 1
of interest are not necessarily MCL
Uranium - Summary of the Stage 1
of interest are not necessarily MCL
Uranium - Summary of the Stage 1
of interest are not necessarily MCL
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
(Peak) Analyses (Single detections > threshold
violations)
Vinyl Chloride - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Vinyl Chloride - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Vinyl Chloride - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
-------
Table A68c.
Table A68d.
Table A68e.
Table A69.
Table A69a.
Table A69b.
Table A69c.
Table A69d.
Table A69e.
Vinyl Chloride - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Vinyl Chloride - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Vinyl Chloride - Summary of the Stage 1 (Peak) Analyses (Single detections
> threshold of interest are not necessarily MCL violations)
Xylenes (Total) - Summary
threshold of interest are not
Xylenes (Total) - Summary
threshold of interest are not
Xylenes (Total) - Summary
threshold of interest are not
Xylenes (Total) - Summary
threshold of interest are not
Xylenes (Total) - Summary
threshold of interest are not
Xylenes (Total) - Summary
threshold of interest are not
of the Stage 1 (Peak) Analyses (Single detections >
necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single detections >
necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single detections >
necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single detections >
necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single detections >
necessarily MCL violations)
of the Stage 1 (Peak) Analyses (Single detections >
necessarily MCL violations)
-------
Appendix B. Stage 2 Analysis Occurrence Measures
for Select Regulated Contaminants
Table Bl. Benzene - Summary of the Stage 2 Analyses
Table B2. Carbofuran - Summary of the Stage 2 Analyses
Table B3. Carbon Tetrachloride - Summary of the Stage 2 Analyses
Table B4. Chlordane - Summary of the Stage 2 Analyses
Table B5. l,2-Dibromo-3-chloropropane (DBCP) - Summary of the Stage 2 Analyses
Table B6. 1,2-Dichloroethane - Summary of the Stage 2 Analyses
Table B7. Dichloromethane - Summary of the Stage 2 Analyses
Table B8. 2,4-Dichlorophenoxyacetic Acid - Summary of the Stage 2 Analyses
Table B9. 1,2-Dichloropropane - Summary of the Stage 2 Analyses
Table BIO. Endothall - Summary of the Stage 2 Analyses
Table B11. Heptachlor - Summary of the Stage 2 Analyses
Table B12. Heptachlor Epoxide - Summary of the Stage 2 Analyses
Table B13. Hexachlorobenzene - Summary of the Stage 2 Analyses
Table B14. Hexachlorocyclopentadiene - Summary of the Stage 2 Analyses
Table B15. Oxamyl (Vydate) - Summary of the Stage 2 Analyses
Table B16. Tetrachloroethylene (PCE) - Summary of the Stage 2 Analyses
Table B17. Toluene - Summary of the Stage 2 Analyses
Table B18. Toxaphene - Summary of the Stage 2 Analyses
Table B19. 1,1,2-Trichloroethane - Summary of the Stage 2 Analyses
Table B20. Trichloroethylene (TCE) - Summary of the Stage 2 Analyses
Table B21. Vinyl Chloride - Summary of the Stage 2 Analyses
Table B22. Xylenes (Total) - Summary of the Stage 2 Analyses
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table Al. Alachlor — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold of
Interest
> 0.002 mg/L
> 0.001 mg/L
> 0.002 mg/L
> 0.001 mg/L
> 0.002 mg/L
> 0.001 mg/L
Total # Systems
Reporting
44,863
44,863
3,996
3,996
48,859
48,859
# Systems Exceeding
Threshold of Interest
64
223
18
51
82
274
% Systems Exceeding
Threshold of Interest
0.143%
0.497%
0.450%
1.276%
0.168%
0.561%
Total Pop. Served by
Systems Reporting
85,514,854
85,514,854
144,338,525
144,338,525
229,853,379
229,853,379
Total Pop. Served by
Systems Exceeding
Threshold of Interest
617,666
2,282,255
1,973,654
10,552,870
2,591,320
12,835,125
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.722%
2.669%
1.367%
7.311%
1.127%
5.584%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table Ala. Alachlor — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
866
2,683
2,186
6,219
34,622
4,378
2,589
762
2,149
3,646
1,178
1,491
2,664
3,420
4,699
1,758
2,982
5,096
2,702
5,591
3,207
5,704
2,751
9,222
348
1,937
2,928
6,722
3,508
1,836
3,398
4,553
420
1,320
904
3,403
388
1,631
14,712
6,931
2,804
2,059
7,023
1,116
1,123
181,629
GW
613
1,829
1,529
4,855
20,422
2,321
1,866
709
2,080
3,005
1,116
1,228
2,386
3,017
4,216
532
2,022
3,986
2,302
5,436
3,159
4,923
2,472
7,786
304
1,849
2,764
6,004
3,182
1,305
2,546
3,927
346
957
674
2,940
359
482
12,141
5,432
2,195
1,738
6,851
423
875
141,104
SW
253
854
657
1,364
14,200
2,057
723
53
69
641
62
263
278
403
483
1,226
960
1,110
400
155
48
781
279
1,436
44
88
164
718
326
531
852
626
74
363
230
463
29
1,149
2,571
1,499
609
321
172
693
248
40,525
Percent of Samples
with Detections
Total
1.963%
1.416%
0.091%
1.769%
1.765%
1.256%
1.159%
2.493%
5.398%
0.082%
0.170%
0.671%
1.051%
0.526%
1.000%
4.039%
1.979%
0.608%
1.925%
4.525%
0.904%
0.666%
0.327%
1.247%
0.000%
0.000%
0.376%
5.356%
1.226%
1.634%
0.971%
1.340%
0.476%
0.455%
0.221%
2.116%
1.289%
1.165%
0.387%
5.194%
0.713%
0.826%
4.841%
3.495%
0.890%
1.789%
GW
2.121%
1.093%
0.131%
1.833%
2.155%
0.991%
1.447%
2.539%
5.481%
0.033%
0.179%
0.814%
1.006%
0.464%
0.783%
2.820%
2.324%
0.477%
2.215%
4.507%
0.823%
0.711%
0.324%
1.259%
0.000%
0.000%
0.398%
5.763%
1.288%
1.686%
0.943%
1.477%
0.578%
0.627%
0.297%
1.259%
1.114%
0.415%
0.387%
5.468%
0.774%
0.921%
4.904%
4.965%
1.029%
1.894%
SW
1.581%
2.108%
0.000%
1.540%
1.204%
1.556%
0.415%
1.887%
2.899%
0.312%
0.000%
0.000%
1.439%
0.993%
2.899%
4.568%
1.250%
1.081%
0.250%
5.161%
6.250%
0.384%
0.358%
1.184%
0.000%
0.000%
0.000%
1.950%
0.613%
1.507%
1.056%
0.479%
0.000%
0.000%
0.000%
7.559%
3.448%
1.480%
0.389%
4.203%
0.493%
0.312%
2.326%
2.597%
0.403%
1.426%
Minimum Detect
Concentration (mg/L)
Total
0.0002
0.00003
0.0005
0.0001
2.1E-05
0.00005
0.00009
0.0001
0.0001
0.00026
0.0006
0.0002
0.0001
6.5E-05
0.0001
0.0001
0.00004
0.0001
0.00005
0.00003
0.00003
0.00004
0.0002
0.00006
0.0001
0.00004
0.0002
0.0001
0.0002
0.00012
0.00005
0.0002
0.0025
0.0002
0.0002
0.00009
0.0002
0.0001
0.0002
0.00003
2.5E-05
9.3E-05
0.0001
2.1E-05
GW
0.0002
0.00006
0.0005
0.0001
2.1E-05
0.0001
0.00009
0.0001
0.0001
0.0016
0.0006
0.0002
0.0001
6.5E-05
0.0001
0.0002
0.00004
0.0002
0.00005
0.00003
0.00003
0.00004
0.0002
0.0001
0.0001
0.00004
0.0002
0.0001
0.0002
0.00012
0.00005
0.0002
0.0025
0.0002
0.0002
0.0002
0.0002
0.0001
0.0002
0.00003
2.5E-05
9.3E-05
0.0001
2.1E-05
SW
0.0002
0.00003
0.00012
2.2E-05
0.00005
0.0002
0.0001
0.0001
0.00026
0.0002
0.00011
0.0001
0.0001
0.0002
0.0001
0.0001
0.00003
0.00003
0.00016
0.0002
0.00006
0.00004
0.0005
0.0002
0.0002
0.00021
0.00032
0.0011
0.00009
0.00021
0.0001
0.0002
0.0003
0.0001
9.3E-05
0.003
2.2E-05
Median Detect
Concentration (mg/L)
Total
0.0003
0.0005
0.0005
0.0003
0.00011
0.0002
0.0003
0.0005
0.0002
0.0016
0.00065
0.00037
0.00042
0.0002
0.00023
0.0003
0.00027
0.0005
0.0001
0.00004
0.00006
0.00028
0.0003
0.0003
0.0003
0.0004
0.0003
0.0004
0.0002
0.00035
0.00014
0.00095
0.00625
0.00045
0.0008
0.0003
0.0004
0.0002
0.0002
0.0002
0.00015
0.001
0.00055
0.0002
GW
0.0003
0.00047
0.0005
0.00039
0.00012
0.0002
0.00029
0.0005
0.0002
0.0016
0.00065
0.00037
0.00047
0.00022
0.0002
0.0003
0.00026
0.0005
0.0001
0.00004
0.00006
0.00028
0.0003
0.0003
0.0003
0.00042
0.0003
0.00039
0.0002
0.00036
0.00014
0.00095
0.00625
0.0003
0.0005
0.0007
0.0005
0.0002
0.0002
0.0002
0.00015
0.001
0.0005
0.0002
SW
0.0002
0.00059
0.0002
0.0001
0.00021
0.0003
0.0001
0.0004
0.00263
0.0003
0.00017
0.00055
0.0003
0.0005
0.00055
0.0001
0.00004
0.00005
0.00019
0.0002
0.0003
0.00025
0.00125
0.00042
0.00028
0.0003
0.00049
0.0011
0.0003
0.0003
0.0002
0.0002
0.0003
0.00045
0.00057
0.003
0.0002
90th Percentile Detect
Concentration (mg/L)
Total
0.00051
0.00147
0.0005
0.0011
0.0012
0.00097
0.002
0.002
0.0007
0.005
0.0007
0.00081
0.0022
0.00096
0.0013
0.0007
0.001
0.0019
0.00013
0.00013
0.00027
0.00087
0.0028
0.0007
0.0026
0.00157
0.0014
0.00091
0.002
0.001
0.00022
0.0013
0.01
0.002
0.0013
0.0012
0.00125
0.0004
0.00075
0.002
0.00042
0.002
0.00225
0.001
GW
0.00051
0.0011
0.0005
0.0011
0.0012
0.00097
0.002
0.002
0.0007
0.0016
0.0007
0.00081
0.0022
0.00096
0.0015
0.0085
0.001
0.002
0.00013
0.00014
0.00027
0.00087
0.0028
0.0007
0.0026
0.0016
0.0014
0.001
0.002
0.00105
0.00022
0.0013
0.01
0.0018
0.0013
0.0012
0.0013
0.0004
0.001
0.002
0.00041
0.001
0.0015
0.001
SW
0.00027
0.0015
0.001
0.0012
0.00051
0.002
0.0001
0.0007
0.005
0.0009
0.0003
0.0009
0.0007
0.0005
0.0016
0.0001
0.0001
0.00012
0.00032
0.0002
0.0006
0.0005
0.002
0.00081
0.0021
0.00065
0.0039
0.0011
0.0011
0.00053
0.0004
0.0005
0.0003
0.0028
0.0027
0.003
0.001
Maximum Detect
Concentration (mg/L)
Total
0.0071
0.002
0.0005
0.0031
0.01
0.002
0.002
0.01
0.002
0.005
0.0007
0.001
0.06
0.002
0.002
0.0086
0.01
0.006
0.0003
0.00506
0.00037
0.00114
0.0028
0.03
0.0078
0.03
0.0026
0.0028
0.004
0.02
0.00022
0.0013
0.01
0.02
0.0013
0.0016
0.0019
0.001
0.0026
0.02
0.0077
0.1
0.003
0.1
GW
0.0071
0.002
0.0005
0.0031
0.01
0.0018
0.002
0.01
0.002
0.0016
0.0007
0.001
0.06
0.002
0.002
0.0086
0.01
0.006
0.0003
0.00506
0.00037
0.00114
0.0028
0.03
0.0078
0.03
0.0026
0.0028
0.004
0.02
0.00022
0.0013
0.01
0.0045
0.0013
0.0012
0.0019
0.001
0.0026
0.02
0.0077
0.002
0.0015
0.06
SW
0.00027
0.0019
0.0011
0.009
0.002
0.002
0.0001
0.0007
0.005
0.0009
0.0003
0.001
0.003
0.002
0.0032
0.0001
0.0001
0.00012
0.00032
0.0002
0.0007
0.001
0.002
0.00081
0.0021
0.00065
0.02
0.0011
0.0016
0.00053
0.0006
0.0005
0.0003
0.0028
0.1
0.003
0.1
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table Alb. Alach lor — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
490
352
453
1,049
3,772
838
1,170
281
1,335
1,734
107
967
896
1,489
1,622
242
676
1,038
806
2,850
1,438
1,421
845
2,285
217
731
1,216
1,372
720
324
1,571
1,915
202
733
143
822
235
350
4,888
507
1,582
598
1,823
450
304
48,859
GW
389
279
381
1,001
3,252
617
1,131
278
1,309
1,618
95
934
848
1,386
1,573
93
558
970
752
2,801
1,411
1,344
786
2,146
190
720
1,175
1,335
681
304
1,332
1,790
175
611
134
757
224
161
4,547
457
1,414
556
1,803
290
255
44,863
SW
101
73
72
48
520
221
39
3
26
116
12
33
48
103
49
149
118
68
54
49
27
77
59
139
27
11
41
37
39
20
239
125
27
122
9
65
11
189
341
50
168
42
20
160
49
3,996
Total Population Served by Systems
Reporting
Total
546,448
4,701,100
2,452,800
6,161,306
36,340,528
4,998,506
2,716,176
679,823
17,251,183
7,466,977
1,303,767
2,500,395
1,050,473
9,168,041
4,980,031
4,602,489
8,525,575
5,022,488
727,707
6,539,864
3,894,967
3,006,743
757,505
6,973,678
563,069
1,449,290
942,517
7,762,526
1,667,049
970,526
11,195,033
10,216,143
749,266
2,777,164
913,584
3,462,560
328,972
5,683,572
25,060,220
2,543,652
4,803,450
490,389
4,044,416
1,415,227
446,184
229,853,379
GW
210,227
1,463,066
909,774
2,790,715
13,511,104
533,275
382,254
398,423
15,005,141
1,574,196
1,249,139
1,391,769
806,038
2,967,969
2,619,576
375,460
1,718,151
1,024,381
292,103
1,815,364
2,661,430
1,692,282
365,106
1,708,512
257,844
672,810
392,718
2,726,580
1,400,501
280,727
1,218,149
3,121,206
276,712
487,418
173,606
804,033
237,011
1,460,816
9,275,719
1,686,017
634,384
226,621
2,352,672
234,687
129,168
85,514,854
SW
336,221
3,238,034
1,543,026
3,370,591
22,829,424
4,465,231
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
244,435
6,200,072
2,360,455
4,227,029
6,807,424
3,998,107
435,604
4,724,500
1,233,537
1,314,461
392,399
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,799
9,976,884
7,094,937
472,554
2,289,746
739,978
2,658,527
91,961
4,222,756
15,784,501
857,635
4,169,066
263,768
1,691,744
1,180,540
317,016
144,338,525
Percent of Systems
with At Least One Detection
Total
3.061%
7.955%
0.221%
5.338%
6.098%
4.415%
2.393%
2.135%
4.270%
0.173%
0.935%
1.034%
2.567%
1.075%
2.528%
18.182%
5.030%
2.505%
4.839%
8.316%
1.878%
2.111%
0.828%
4.245%
0.000%
0.000%
0.658%
12.026%
5.000%
7.407%
2.101%
2.663%
0.990%
0.819%
1.399%
5.231%
2.128%
4.286%
1.002%
18.343%
0.822%
2.508%
13.165%
7.778%
2.961%
3.964%
GW
3.085%
5.735%
0.262%
4.795%
5.566%
2.593%
2.210%
1.799%
4.202%
0.062%
1.053%
1.071%
2.594%
0.938%
1.971%
10.753%
5.197%
1.649%
5.053%
8.283%
1.772%
2.083%
0.763%
3.868%
0.000%
0.000%
0.681%
11.685%
4.993%
5.921%
1.802%
2.682%
1.143%
0.982%
1.493%
3.435%
1.786%
1.242%
0.968%
16.849%
0.778%
2.518%
13.145%
7.241%
3.137%
3.669%
SW
2.970%
16.438%
0.000%
16.667%
9.423%
9.502%
7.692%
33.333%
7.692%
1.724%
0.000%
0.000%
2.083%
2.913%
20.408%
22.819%
4.237%
14.706%
1.852%
10.204%
7.407%
2.597%
1.695%
10.072%
0.000%
0.000%
0.000%
24.324%
5.128%
30.000%
3.766%
2.400%
0.000%
0.000%
0.000%
26.154%
9.091%
6.878%
1.466%
32.000%
1.190%
2.381%
15.000%
8.750%
2.041%
7.282%
Percent of Population Served
with At Least One Detection
Total
43.258%
28.081%
0.020%
51.813%
33.929%
17.246%
3.019%
20.553%
26.294%
1.371%
0.031%
1.443%
26.491%
4.084%
29.845%
43.234%
43.332%
40.382%
5.906%
59.692%
3.698%
1.817%
0.445%
13.455%
0.000%
0.000%
2.179%
21.470%
8.281%
46.780%
0.855%
0.952%
0.219%
0.124%
3.139%
36.478%
22.993%
12.423%
5.944%
59.137%
0.202%
1.151%
16.875%
4.848%
0.858%
20.052%
GW
1.748%
10.073%
0.054%
10.985%
32.197%
1.553%
1.056%
8.648%
28.131%
0.011%
0.032%
2.593%
11.449%
6.653%
4.558%
7.753%
3.528%
25.692%
13.898%
22.622%
4.478%
1.400%
0.900%
6.417%
0.000%
0.000%
5.230%
34.076%
9.233%
17.939%
0.974%
1.473%
0.594%
0.706%
16.521%
3.526%
4.919%
0.040%
14.742%
49.220%
0.889%
1.210%
24.966%
4.737%
1.366%
17.131%
SW
69.213%
36.218%
0.000%
85.617%
34.954%
19.121%
3.341%
37.409%
14.021%
1.735%
0.000%
0.000%
76.094%
2.854%
57.907%
46.386%
53.379%
44.146%
0.546%
73.936%
2.015%
2.354%
0.022%
15.739%
0.000%
0.000%
0.000%
14.645%
3.282%
58.517%
0.841%
0.723%
0.000%
0.000%
0.000%
46.444%
69.576%
16.707%
0.773%
78.633%
0.097%
1.099%
5.623%
4.870%
0.651%
21.783%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table Ale. Alachlor — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.002 mg/L
Total
1
0
0
2
16
0
0
1
0
1
0
0
3
0
0
3
2
2
0
2
0
0
1
2
0
0
2
16
1
1
2
2
0
0
2
6
0
0
0
0
1
1
8
3
1
82
GW
1
0
0
2
10
0
0
1
0
0
0
0
3
0
0
2
2
1
0
2
0
0
1
2
0
0
2
16
1
1
1
2
0
0
2
3
0
0
0
0
1
1
7
0
0
64
SW
0
0
0
0
6
0
0
0
0
1
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
3
0
0
0
0
0
0
1
3
1
18
Percent of Systems
with At Least One Detection
> 0.002 mg/L
Total
0.204%
0.000%
0.000%
0.191%
0.424%
0.000%
0.000%
0.356%
0.000%
0.058%
0.000%
0.000%
0.335%
0.000%
0.000%
1.240%
0.296%
0.193%
0.000%
0.070%
0.000%
0.000%
0.118%
0.088%
0.000%
0.000%
0.164%
1.166%
0.139%
0.309%
0.127%
0.104%
0.000%
0.000%
1.399%
0.730%
0.000%
0.000%
0.000%
0.000%
0.063%
0.167%
0.439%
0.667%
0.329%
0.168%
GW
0.257%
0.000%
0.000%
0.200%
0.308%
0.000%
0.000%
0.360%
0.000%
0.000%
0.000%
0.000%
0.354%
0.000%
0.000%
2.151%
0.358%
0.103%
0.000%
0.071%
0.000%
0.000%
0.127%
0.093%
0.000%
0.000%
0.170%
1.199%
0.147%
0.329%
0.075%
0.112%
0.000%
0.000%
1.493%
0.396%
0.000%
0.000%
0.000%
0.000%
0.071%
0.180%
0.388%
0.000%
0.000%
0.143%
SW
0.000%
0.000%
0.000%
0.000%
1.154%
0.000%
0.000%
0.000%
0.000%
0.862%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
0.000%
1.471%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.418%
0.000%
0.000%
0.000%
0.000%
4.615%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.000%
1.875%
2.041%
0.450%
Population Served by Systems
with At Least One Detection
> 0.002 mg/L
Total
200
0
0
277
1,873,292
0
0
6,150
0
2,671
0
0
2,163
0
0
99,748
745
4,058
0
109
0
0
150
65
0
0
113
27,879
23,540
30
18,643
960
0
0
28,681
426,360
0
0
0
0
98
40
35,580
37,703
2,065
2,591,320
GW
200
0
0
277
502,592
0
0
6,150
0
0
0
0
2,163
0
0
4,877
745
58
0
109
0
0
150
65
0
0
113
27,879
23,540
30
3,000
960
0
0
28,681
1,699
0
0
0
0
98
40
14,240
0
0
617,666
SW
0
0
0
0
1,370,700
0
0
0
0
2,671
0
0
0
0
0
94,871
0
4,000
0
0
0
0
0
0
0
0
0
0
0
0
15,643
0
0
0
0
424,661
0
0
0
0
0
0
21,340
37,703
2,065
1,973,654
Percent of Population Served
with At Least One Detection
> 0.002 mg/L
Total
0.037%
0.000%
0.000%
0.004%
5.155%
0.000%
0.000%
0.905%
0.000%
0.036%
0.000%
0.000%
0.206%
0.000%
0.000%
2.167%
0.009%
0.081%
0.000%
0.002%
0.000%
0.000%
0.020%
0.001%
0.000%
0.000%
0.012%
0.359%
1.412%
0.003%
0.167%
0.009%
0.000%
0.000%
3.139%
12.313%
0.000%
0.000%
0.000%
0.000%
0.002%
0.008%
0.880%
2.664%
0.463%
1.127%
GW
0.095%
0.000%
0.000%
0.010%
3.720%
0.000%
0.000%
1.544%
0.000%
0.000%
0.000%
0.000%
0.268%
0.000%
0.000%
1.299%
0.043%
0.006%
0.000%
0.006%
0.000%
0.000%
0.041%
0.004%
0.000%
0.000%
0.029%
1.022%
1.681%
0.011%
0.246%
0.031%
0.000%
0.000%
16.521%
0.211%
0.000%
0.000%
0.000%
0.000%
0.015%
0.018%
0.605%
0.000%
0.000%
0.722%
SW
0.000%
0.000%
0.000%
0.000%
6.004%
0.000%
0.000%
0.000%
0.000%
0.045%
0.000%
0.000%
0.000%
0.000%
0.000%
2.244%
0.000%
0.100%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.157%
0.000%
0.000%
0.000%
0.000%
15.974%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.261%
3.194%
0.651%
1.367%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table Aid. Alachlor — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.001 mg/L
Total
1
6
0
13
55
4
7
1
8
2
0
1
3
1
8
3
6
5
0
2
0
1
1
5
0
0
4
41
7
3
5
6
0
3
2
10
2
3
10
1
2
2
14
23
3
274
GW
1
2
0
11
39
2
6
1
8
1
0
1
3
1
7
2
5
2
0
2
0
1
1
5
0
0
4
40
6
3
4
6
0
3
2
5
1
1
10
1
2
2
13
17
2
223
SW
0
4
0
2
16
2
1
0
0
1
0
0
0
0
1
1
1
3
0
0
0
0
0
0
0
0
0
1
1
0
1
0
0
0
0
5
1
2
0
0
0
0
1
6
1
51
Percent of Systems
with At Least One Detection
> 0.001 mg/L
Total
0.204%
1.705%
0.000%
1.239%
1.458%
0.477%
0.598%
0.356%
0.599%
0.115%
0.000%
0.103%
0.335%
0.067%
0.493%
1.240%
0.888%
0.482%
0.000%
0.070%
0.000%
0.070%
0.118%
0.219%
0.000%
0.000%
0.329%
2.988%
0.972%
0.926%
0.318%
0.313%
0.000%
0.409%
1.399%
1.217%
0.851%
0.857%
0.205%
0.197%
0.126%
0.334%
0.768%
5.111%
0.987%
0.561%
GW
0.257%
0.717%
0.000%
1.099%
1.199%
0.324%
0.531%
0.360%
0.611%
0.062%
0.000%
0.107%
0.354%
0.072%
0.445%
2.151%
0.896%
0.206%
0.000%
0.071%
0.000%
0.074%
0.127%
0.233%
0.000%
0.000%
0.340%
2.996%
0.881%
0.987%
0.300%
0.335%
0.000%
0.491%
1.493%
0.661%
0.446%
0.621%
0.220%
0.219%
0.141%
0.360%
0.721%
5.862%
0.784%
0.497%
SW
0.000%
5.479%
0.000%
4.167%
3.077%
0.905%
2.564%
0.000%
0.000%
0.862%
0.000%
0.000%
0.000%
0.000%
2.041%
0.671%
0.847%
4.412%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.703%
2.564%
0.000%
0.418%
0.000%
0.000%
0.000%
0.000%
7.692%
9.091%
1.058%
0.000%
0.000%
0.000%
0.000%
5.000%
3.750%
2.041%
1.276%
Population Served by Systems
with At Least One Detection
> 0.001 mg/L
Total
200
958,009
0
715,990
7,342,316
147,212
37,823
6,150
515,436
2,846
0
510
2,163
684
49,172
99,748
11,042
1,725,538
0
109
0
235
150
2,206
0
0
19,166
274,161
36,726
3,163
19,087
7,974
0
3,306
28,681
428,676
64,027
9,677
13,335
15,800
423
190
242,886
47,732
2,576
12,835,125
GW
200
3,342
0
90,765
1,126,527
445
1,756
6,150
515,436
175
0
510
2,163
684
43,184
4,877
8,156
238
0
109
0
235
150
2,206
0
0
19,166
124,161
28,102
3,163
3,444
7,974
0
3,306
28,681
2,025
44
33
13,335
15,800
423
190
221,546
3,043
511
2,282,255
SW
0
954,667
0
625,225
6,215,789
146,767
36,067
0
0
2,671
0
0
0
0
5,988
94,871
2,886
1,725,300
0
0
0
0
0
0
0
0
0
150,000
8,624
0
15,643
0
0
0
0
426,651
63,983
9,644
0
0
0
0
21,340
44,689
2,065
10,552,870
Percent of Population Served
with At Least One Detection
> 0.001 mg/L
Total
0.037%
20.378%
0.000%
11.621%
20.204%
2.945%
1.393%
0.905%
2.988%
0.038%
0.000%
0.020%
0.206%
0.007%
0.987%
2.167%
0.130%
34.356%
0.000%
0.002%
0.000%
0.008%
0.020%
0.032%
0.000%
0.000%
2.033%
3.532%
2.203%
0.326%
0.170%
0.078%
0.000%
0.119%
3.139%
12.380%
19.463%
0.170%
0.053%
0.621%
0.009%
0.039%
6.005%
3.373%
0.577%
5.584%
GW
0.095%
0.228%
0.000%
3.252%
8.338%
0.083%
0.459%
1.544%
3.435%
0.011%
0.000%
0.037%
0.268%
0.023%
1.649%
1.299%
0.475%
0.023%
0.000%
0.006%
0.000%
0.014%
0.041%
0.129%
0.000%
0.000%
4.880%
4.554%
2.007%
1.127%
0.283%
0.255%
0.000%
0.678%
16.521%
0.252%
0.019%
0.002%
0.144%
0.937%
0.067%
0.084%
9.417%
1.297%
0.396%
2.669%
SW
0.000%
29.483%
0.000%
18.549%
27.227%
3.287%
1.545%
0.000%
0.000%
0.045%
0.000%
0.000%
0.000%
0.000%
0.254%
2.244%
0.042%
43.153%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.979%
3.235%
0.000%
0.157%
0.000%
0.000%
0.000%
0.000%
16.048%
69.576%
0.228%
0.000%
0.000%
0.000%
0.000%
1.261%
3.785%
0.651%
7.311%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A2. Alpha Particles — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration or
Threshold of
Interest
> 15 pCi/L
> 7.5 pCi/L
> 15 pCi/L
> 7.5 pCi/L
> 15 pCi/L
> 7.5 pCi/L
Total # Systems
Reporting
16,467
16,467
2,186
2,186
18,653
18,653
# Systems Exceeding
Threshold of Interest
832
2,511
22
85
854
2,596
% Systems Exceeding
Threshold of Interest
5.053%
15.249%
1.006%
3.888%
4.578%
13.917%
Total Pop. Served by
Systems Reporting
40,744,045
40,744,045
80,426,355
80,426,355
121,170,400
121,170,400
Total Pop. Served by
Systems Exceeding
Threshold of Interest
2,891,759
8,323,500
4,631,051
10,037,894
7,522,810
18,361,394
% Pop. Served by
Systems Exceeding
Threshold of Interest
7.097%
20.429%
5.758%
12.481%
6.208%
15.153%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A2a. Alpha Particles— Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
776
1,783
6,201
1,194
2,014
783
44
873
130
1,309
2,012
715
3,026
3,212
515
1,878
10,941
15
503
2,589
2,868
357
556
2,626
929
509
1,858
457
2,039
12,449
4,577
708
1,018
800
738
73,002
GW
598
1,211
4,406
968
1,818
740
44
804
130
425
1,641
633
2,921
3,166
492
1,730
10,266
13
486
2,125
2,679
321
452
2,014
733
450
1,706
417
980
10,942
3,780
574
900
463
625
61,653
SW
178
572
1,795
226
196
43
0
69
0
884
371
82
105
46
23
148
675
2
17
464
189
36
104
612
196
59
152
40
1,059
1,507
797
134
118
337
113
11,349
Percent of Samples
with Detections
Total
45.361%
55.693%
91.292%
78.392%
39.275%
69.221%
95.455%
83.620%
56.923%
68.831%
59.394%
98.182%
37.938%
73.692%
83.107%
44.941%
38.726%
46.667%
72.167%
69.641%
88.389%
59.104%
55.396%
12.643%
10.872%
75.442%
60.118%
80.525%
52.771%
49.161%
64.868%
82.768%
66.798%
74.375%
42.412%
57.274%
GW
53.344%
61.354%
94.507%
82.335%
40.869%
70.135%
95.455%
84.328%
56.923%
88.941%
61.060%
98.262%
38.651%
74.574%
86.382%
46.532%
40.162%
38.462%
72.016%
72.094%
88.503%
62.305%
56.195%
15.144%
11.460%
77.778%
62.134%
80.576%
63.571%
51.800%
68.122%
82.578%
69.000%
80.562%
42.560%
58.993%
SW
18.539%
43.706%
83.398%
61.504%
24.490%
53.488%
75.362%
59.163%
52.022%
97.561%
18.095%
13.043%
13.043%
26.351%
16.889%
100.000%
76.471%
58.405%
86.772%
30.556%
51.923%
4.412%
8.673%
57.627%
37.500%
80.000%
42.776%
29.993%
49.435%
83.582%
50.000%
65.875%
41.593%
47.934%
Minimum Detect
Concentration (pCi/L)
Total
0.09
0.005
0.1
0.01
0.02
0.03
3.2
0.02
0.1
8E-10
0.19
0.01
0.01
0.27
0.2
0.2
0.01
0.19
0.1
0.01
0.1
0.05
0.01
0.2
0.01
0.05
1
0.3
0.01
2
1
0.1
0.03
0.1
0.1
8E-10
GW
0.09
0.005
0.1
0.01
0.04
0.03
3.2
0.02
0.1
8E-10
0.19
0.01
0.01
0.27
0.2
0.2
0.01
0.19
0.1
0.01
0.1
0.05
0.01
0.2
0.01
0.05
1
0.3
0.01
2
1
0.1
0.1
0.1
0.1
8E-10
SW
0.37
0.1
0.1
0.01
0.02
0.9
0.1
0.02
0.5
0.01
0.1
0.4
1
0.67
0.03
0.8
0.2
0.02
0.1
1.1
0.04
0.4
0.17
0.13
1
0.7
0.03
2
1
0.1
0.03
0.1
0.59
0.01
Median Detect
Concentration (pCi/L)
Total
1.2
0.9
2.9
4.1
3.48
2.1
18.9
3.3
1.25
0.6
3
1.14
2.865
6.46
5.4
2.9
4.29
1.5
6.2
5.4
4.6
1.5
1.69
4.11
1.34
3.075
3.4
3.6
1.1
5.6
3
0.9
2.515
0.9
3
3.36
GW
1.2
1.1
3.1
4.8
3.6
2.2
18.9
3.4
1.25
0.8
3
1.385
2.9
6.5
5.5
3
4.36
1.5
6.3
5.4
4.8
1.465
2.04
4.23
1.425
3.57
3.5
3.7
1.25
5.7
3
1.1
2.71
1.1
3.4
3.7
SW
1.1
0.5
2.1
2.1
0.925
1.3
1.6
0.5
2
0.325
2.1
1.1
4.2
1.6
0.425
3.7
4.1
5.3
1.55
2
0.825
3.46
1
1.165
1.6
2.4
1
4.8
4
0.5
1.39
0.5
1.8
1.6
90th Percentile Detect
Concentration (pCi/L)
Total
4.5
3.5
7.2
25
11.73
6.6
32.1
17.35
3.9
2
14
12.14
7.4
17.9
22.1
8
20.68
6.6
15.3
17
23.7
5
5.84
7.83
5.4
12.21
12.9
10.6
2.3
16.6
8
6.3
14.65
3.6
12.1
13
GW
4.7
4.1
7.8
26
12
6.7
32.1
18.4
3.9
2.6
14
13.14
7.4
17.9
22.1
8
21.22
4.4
15.7
17
24.9
5
6.44
8.05
5.4
12.605
12.9
11
2.7
16.8
8
7.3
15.45
5.3
12.3
13.81
SW
2
2.01
4.9
12
4.3
3.4
9.9
1.6
14
1.92
6
5
6.3
8.9
3.6
6.6
8.1
16
6
4.49
3.4
6.05
5.85
2.72
10.5
6.8
1.7
15.3
8
1.5
3.87
1.9
5.9
6.8
Maximum Detect
Concentration (pCi/L)
Total
9.99
42
25.3
154
60.45
40
48.8
107.2
11.6
19.9
72
348.33
33.4
84
96.6
17.1
295.5
6.6
60
280
155
66.92
36
15.3
39.1
71.32
101
31
17.8
205.1
70
27
56.1
21
39.9
348.33
GW
9.99
42
25.3
154
60.45
40
48.8
107.2
11.6
12.3
72
348.33
33.4
84
96.6
17.1
295.5
4.4
60
280
155
66.92
36
15.3
39.1
71.32
101
31
17.8
205.1
70
27
56.1
21
39.9
348.33
SW
3
9.64
14.3
47.4
9.75
4.2
31.3
19.9
35
133.53
10
5
6.3
14.1
7.2
6.6
9.5
100
16.2
5.1
5.52
7.09
8.1
5.02
30
7.8
6.9
59.6
17
6
7.62
6.5
25.5
133.53
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A2b. Alpha Particles — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
264
321
711
397
471
207
20
440
33
207
516
370
1,203
922
287
631
1,826
7
96
405
566
103
191
1,035
575
64
452
251
344
3,989
416
395
364
351
223
18,653
GW
193
251
673
301
438
191
20
411
33
67
459
323
1,146
899
264
574
1,694
5
95
372
533
96
152
915
452
56
405
230
157
3,662
369
320
322
203
186
16,467
SW
71
70
38
96
33
16
0
29
0
140
57
47
57
23
23
57
132
2
1
33
33
7
39
120
123
8
47
21
187
327
47
75
42
148
37
2,186
Total Population Served by Systems
Reporting
Total
479,135
4,687,044
5,860,832
3,880,820
2,392,156
7,941,994
29,225
841,950
98,260
4,588,246
4,891,562
612,751
6,713,368
4,068,067
644,443
708,638
6,843,768
17,046
204,396
7,277,246
1,613,612
798,524
530,912
9,786,781
2,505,059
885,894
3,021,859
639,064
5,678,451
24,786,365
2,512,399
3,339,718
452,258
1,408,492
430,065
121,170,400
GW
165,352
1,453,506
2,506,861
312,339
230,267
5,906,110
29,225
617,866
98,260
366,366
898,778
212,054
1,723,511
2,822,206
401,616
316,159
1,583,217
12,881
179,337
2,250,288
1,348,169
149,909
70,933
2,902,824
408,312
146,456
525,705
279,893
1,460,345
9,009,970
1,655,292
158,335
186,370
238,737
116,596
40,744,045
SW
313,783
3,233,538
3,353,971
3,568,481
2,161,889
2,035,884
0
224,084
0
4,221,880
3,992,784
400,697
4,989,857
1,245,861
242,827
392,479
5,260,551
4,165
25,059
5,026,958
265,443
648,615
459,979
6,883,957
2,096,747
739,438
2,496,154
359,171
4,218,106
15,776,395
857,107
3,181,383
265,888
1,169,755
313,469
80,426,355
Percent of Systems
with At Least One Detection
Total
39.394%
87.539%
99.156%
73.804%
71.762%
84.541%
95.000%
86.591%
78.788%
96.618%
75.388%
99.459%
49.377%
81.236%
75.610%
62.124%
72.070%
100.000%
82.292%
98.272%
97.880%
77.670%
78.010%
20.580%
13.217%
93.750%
65.044%
84.064%
95.349%
57.458%
80.769%
86.582%
78.022%
88.319%
62.332%
68.080%
GW
46.114%
86.454%
99.108%
77.076%
72.831%
85.340%
95.000%
87.348%
78.788%
98.507%
75.163%
99.381%
50.436%
82.870%
81.061%
63.240%
73.908%
100.000%
82.105%
98.925%
97.749%
77.083%
78.947%
21.093%
14.159%
94.643%
66.420%
85.217%
97.452%
59.776%
83.740%
86.563%
79.503%
90.148%
63.978%
69.242%
SW
21.127%
91.429%
100.000%
63.542%
57.576%
75.000%
75.862%
95.714%
77.193%
100.000%
28.070%
17.391%
13.043%
50.877%
48.485%
100.000%
100.000%
90.909%
100.000%
85.714%
74.359%
16.667%
9.756%
87.500%
53.191%
71.429%
93.583%
31.498%
57.447%
86.667%
66.667%
85.811%
54.054%
59.332%
Percent of Population Served
with At Least One Detection
Total
11.821%
92.626%
99.986%
51.283%
61.589%
84.347%
97.047%
97.645%
76.183%
90.946%
96.762%
99.935%
69.591%
74.689%
60.727%
53.262%
58.694%
100.000%
83.067%
83.353%
99.918%
97.266%
35.338%
14.547%
12.623%
98.668%
69.265%
86.924%
95.964%
51.756%
92.487%
93.945%
66.265%
91.622%
63.270%
68.542%
GW
27.168%
92.678%
99.968%
91.187%
79.964%
87.451%
97.047%
97.977%
76.183%
99.990%
92.584%
99.811%
56.999%
89.221%
81.931%
73.404%
71.066%
100.000%
80.701%
95.346%
99.902%
90.972%
72.079%
16.022%
19.033%
97.478%
83.408%
85.717%
99.217%
71.833%
94.516%
92.600%
73.777%
82.050%
71.519%
78.754%
SW
3.733%
92.603%
100.000%
47.791%
59.632%
75.341%
96.729%
90.161%
97.702%
100.000%
73.940%
41.770%
25.658%
37.037%
54.970%
100.000%
100.000%
77.985%
100.000%
98.720%
29.672%
13.925%
11.375%
98.903%
66.286%
87.864%
94.837%
40.290%
88.567%
94.012%
60.999%
93.576%
60.201%
63.369%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A2c. Alpha Particles — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 15 pCi/L
Total
0
6
3
28
14
6
12
39
0
1
15
28
7
77
28
3
86
0
21
63
84
5
2
1
1
5
26
5
2
236
19
7
14
1
9
854
GW
0
6
3
25
14
6
12
38
0
0
14
27
7
77
28
3
86
0
21
58
83
5
2
1
1
5
24
5
2
231
18
7
14
1
8
832
SW
0
0
0
3
0
0
0
1
0
1
1
1
0
0
0
0
0
0
0
5
1
0
0
0
0
0
2
0
0
5
1
0
0
0
1
22
Percent of Systems
with At Least One Detection
> 15 pCi/L
Total
0.000%
1.869%
0.422%
7.053%
2.972%
2.899%
60.000%
8.864%
0.000%
0.483%
2.907%
7.568%
0.582%
8.351%
9.756%
0.475%
4.710%
0.000%
21.875%
15.556%
14.841%
4.854%
1.047%
0.097%
0.174%
7.813%
5.752%
1.992%
0.581%
5.916%
4.567%
1.772%
3.846%
0.285%
4.036%
4.578%
GW
0.000%
2.390%
0.446%
8.306%
3.196%
3.141%
60.000%
9.246%
0.000%
0.000%
3.050%
8.359%
0.611%
8.565%
10.606%
0.523%
5.077%
0.000%
22.105%
15.591%
15.572%
5.208%
1.316%
0.109%
0.221%
8.929%
5.926%
2.174%
1.274%
6.308%
4.878%
2.188%
4.348%
0.493%
4.301%
5.053%
SW
0.000%
0.000%
0.000%
3.125%
0.000%
0.000%
3.448%
0.714%
1.754%
2.128%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
15.152%
3.030%
0.000%
0.000%
0.000%
0.000%
0.000%
4.255%
0.000%
0.000%
1.529%
2.128%
0.000%
0.000%
0.000%
2.703%
1.006%
Population Served by Systems
with At Least One Detection
> 15 pCi/L
Total
0
68,784
5,284
162,838
2,545
12,361
24,241
346,720
0
1,040
322,589
5,253
10,017
550,631
67,083
2,689
49,231
0
57,320
1,848,268
242,067
1,409
500
460
28
2,292
56,493
1,153
1,387
3,412,280
250,066
5,601
2,528
25
9,627
7,522,810
GW
0
68,784
5,284
51,638
2,545
12,361
24,241
160,720
0
0
317,489
4,650
10,017
550,631
67,083
2,689
49,231
0
57,320
520,598
169,366
1,409
500
460
28
2,292
23,551
1,153
1,387
548,335
227,066
5,601
2,528
25
2,777
2,891,759
SW
0
0
0
111,200
0
0
0
186,000
0
1,040
5,100
603
0
0
0
0
0
0
0
1,327,670
72,701
0
0
0
0
0
32,942
0
0
2,863,945
23,000
0
0
0
6,850
4,631,051
Percent of Population Served
with At Least One Detection
> 15 pCi/L
Total
0.000%
1.468%
0.090%
4.196%
0.106%
0.156%
82.946%
41.181%
0.000%
0.023%
6.595%
0.857%
0.149%
13.535%
10.409%
0.379%
0.719%
0.000%
28.044%
25.398%
15.002%
0.176%
0.094%
0.005%
0.001%
0.259%
1.869%
0.180%
0.024%
13.767%
9.953%
0.168%
0.559%
0.002%
2.238%
6.208%
GW
0.000%
4.732%
0.211%
16.533%
1.105%
0.209%
82.946%
26.012%
0.000%
0.000%
35.325%
2.193%
0.581%
19.511%
16.703%
0.851%
3.110%
0.000%
31.962%
23.135%
12.563%
0.940%
0.705%
0.016%
0.007%
1.565%
4.480%
0.412%
0.095%
6.086%
13.718%
3.537%
1.356%
0.010%
2.382%
7.097%
SW
0.000%
0.000%
0.000%
3.116%
0.000%
0.000%
83.005%
0.025%
0.128%
0.150%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
26.411%
27.389%
0.000%
0.000%
0.000%
0.000%
0.000%
1.320%
0.000%
0.000%
18.153%
2.683%
0.000%
0.000%
0.000%
2.185%
5.758%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A2d. Alpha Particles — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 7.5 pCi/L
Total
3
15
161
67
64
24
18
78
1
9
51
50
49
230
51
54
169
0
44
111
181
6
8
22
3
12
61
36
4
819
92
24
42
11
26
2,596
GW
3
14
153
59
63
24
18
76
1
6
48
48
48
230
51
51
169
0
43
104
178
6
8
22
2
12
58
34
4
797
82
24
41
11
23
2,511
SW
0
1
8
8
1
0
0
2
0
3
3
2
1
0
0
3
0
0
1
7
3
0
0
0
1
0
3
2
0
22
10
0
1
0
3
85
Percent of Systems
with At Least One Detection
> 7.5 pCi/L
Total
1.136%
4.673%
22.644%
16.877%
13.588%
11.594%
90.000%
17.727%
3.030%
4.348%
9.884%
13.514%
4.073%
24.946%
17.770%
8.558%
9.255%
0.000%
45.833%
27.407%
31.979%
5.825%
4.188%
2.126%
0.522%
18.750%
13.496%
14.343%
1.163%
20.531%
22.115%
6.076%
11.538%
3.134%
11.659%
13.917%
GW
1.554%
5.578%
22.734%
19.601%
14.384%
12.565%
90.000%
18.491%
3.030%
8.955%
10.458%
14.861%
4.188%
25.584%
19.318%
8.885%
9.976%
0.000%
45.263%
27.957%
33.396%
6.250%
5.263%
2.404%
0.442%
21.429%
14.321%
14.783%
2.548%
21.764%
22.222%
7.500%
12.733%
5.419%
12.366%
15.249%
SW
0.000%
1.429%
21.053%
8.333%
3.030%
0.000%
0.000%
6.897%
0.000%
2.143%
5.263%
4.255%
1.754%
0.000%
0.000%
5.263%
0.000%
0.000%
100.000%
21.212%
9.091%
0.000%
0.000%
0.000%
0.813%
0.000%
6.383%
9.524%
0.000%
6.728%
21.277%
0.000%
2.381%
0.000%
8.108%
3.888%
Population Served by Systems
with At Least One Detection
> 7.5 pCi/L
Total
580
161,148
3,146,257
356,466
23,602
108,916
27,778
472,365
378
82,598
401,985
17,242
57,231
1,323,952
96,303
29,275
100,325
0
117,873
2,576,578
972,017
2,649
1,266
25,084
11,238
6,756
122,375
220,006
9,985
6,468,010
1,300,123
17,665
15,372
1,113
86,883
18,361,394
GW
580
138,425
730,282
118,756
11,371
108,916
27,778
272,313
378
12,999
393,864
15,576
47,358
1,323,952
96,303
25,030
100,325
0
92,814
967,842
887,256
2,649
1,266
25,084
98
6,756
48,883
27,897
9,985
2,165,740
624,172
17,665
12,412
1,113
7,662
8,323,500
SW
0
22,723
2,415,975
237,710
12,231
0
0
200,052
0
69,599
8,121
1,666
9,873
0
0
4,245
0
0
25,059
1,608,736
84,761
0
0
0
11,140
0
73,492
192,109
0
4,302,270
675,951
0
2,960
0
79,221
10,037,894
Percent of Population Served
with At Least One Detection
> 7.5 pCi/L
Total
0.121%
3.438%
53.683%
9.185%
0.987%
1.371%
95.049%
56.104%
0.385%
1.800%
8.218%
2.814%
0.852%
32.545%
14.944%
4.131%
1.466%
0.000%
57.669%
35.406%
60.239%
0.332%
0.238%
0.256%
0.449%
0.763%
4.050%
34.426%
0.176%
26.095%
51.748%
0.529%
3.399%
0.079%
20.202%
15.153%
GW
0.351%
9.524%
29.131%
38.022%
4.938%
1.844%
95.049%
44.073%
0.385%
3.548%
43.822%
7.345%
2.748%
46.912%
23.979%
7.917%
6.337%
0.000%
51.754%
43.010%
65.812%
1.767%
1.785%
0.864%
0.024%
4.613%
9.299%
9.967%
0.684%
24.037%
37.708%
11.157%
6.660%
0.466%
6.571%
20.429%
SW
0.000%
0.703%
72.033%
6.661%
0.566%
0.000%
0.000%
89.275%
0.000%
1.649%
0.203%
0.416%
0.198%
0.000%
0.000%
1.082%
0.000%
0.000%
100.000%
32.002%
31.932%
0.000%
0.000%
0.000%
0.531%
0.000%
2.944%
53.487%
0.000%
27.270%
78.864%
0.000%
1.113%
0.000%
25.272%
12.481%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A3. Antimony— Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold of
1 nterest
> 0.006 mg/L
> 0.003 mg/L
> 0.006 mg/L
> 0.003 mg/L
> 0.006 mg/L
> 0.003 mg/L
Total # Systems
Reporting
44,971
44,971
4,045
4,045
49,016
49,016
# Systems Exceeding
Threshold of Interest
97
512
33
117
130
629
% Systems Exceeding
Threshold of Interest
0.216%
1.139%
0.816%
2.892%
0.265%
1.283%
Total Pop. Served by
Systems Reporting
85,727,750
85,727,750
137,523,912
137,523,912
223,251,662
223,251,662
Total Pop. Served by
Systems Exceeding
Threshold of Interest
251,693
1,812,718
3,108,813
10,308,814
3,360,506
12,121,532
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.294%
2.115%
2.261%
7.496%
1.505%
5.430%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A3a. Antimony— Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
1,497
2,631
2,308
6,299
35,219
4,369
2,229
686
2,142
2,711
1,173
1,484
3,106
2,763
4,729
1,799
2,961
5,069
2,392
6,738
4,436
5,705
3,229
9,282
345
2,988
2,951
6,572
3,517
2,162
3,307
4,636
420
1,315
857
3,433
384
1,830
14,756
7,395
2,804
2,117
7,006
1,109
1,125
185,986
GW
1,061
1,790
1,644
4,997
20,956
2,326
1,839
638
2,073
2,388
1,112
1,222
2,806
2,364
4,248
551
1,986
3,964
2,002
6,559
4,357
4,927
2,889
7,830
303
2,879
2,787
5,846
3,191
1,629
2,509
4,002
346
953
629
2,970
357
637
12,177
5,597
2,196
1,772
6,835
422
875
145,441
SW
436
841
664
1,302
14,263
2,043
390
48
69
323
61
262
300
399
481
1,248
975
1,105
390
179
79
778
340
1,452
42
109
164
726
326
533
798
634
74
362
228
463
27
1,193
2,579
1,798
608
345
171
687
250
40,545
Percent of Samples
with Detections
Total
1.403%
0.646%
0.433%
1.000%
1.005%
3.662%
2.064%
3.353%
6.303%
0.037%
0.000%
0.270%
1.996%
0.362%
2.072%
5.447%
2.060%
1.282%
6.982%
24.117%
2.570%
0.403%
1.394%
1.767%
0.000%
1.406%
1.491%
0.943%
1.422%
9.019%
2.328%
0.647%
0.714%
0.760%
0.933%
0.524%
7.031%
11.475%
0.149%
11.494%
0.285%
0.756%
3.754%
2.976%
0.533%
2.871%
GW
1.414%
0.559%
0.304%
1.041%
1.131%
3.396%
2.121%
2.978%
6.175%
0.042%
0.000%
0.164%
1.924%
0.423%
1.836%
4.537%
2.115%
0.555%
7.942%
22.503%
2.594%
0.365%
1.488%
1.252%
0.000%
1.459%
1.579%
0.872%
1.442%
11.234%
2.352%
0.625%
0.578%
0.420%
0.954%
0.606%
6.443%
1.099%
0.123%
6.110%
0.319%
0.903%
3.599%
5.213%
0.571%
2.673%
SW
1.376%
0.832%
0.753%
0.845%
0.820%
3.965%
1.795%
8.333%
10.145%
0.000%
0.000%
0.763%
2.667%
0.000%
4.158%
5.849%
1.949%
3.891%
2.051%
83.240%
1.266%
0.643%
0.588%
4.545%
0.000%
0.000%
0.000%
1.515%
1.227%
2.251%
2.256%
0.789%
1.351%
1.657%
0.877%
0.000%
14.815%
17.016%
0.271%
28.254%
0.164%
0.000%
9.942%
1.601%
0.400%
3.581%
Minimum Detect
Concentration (mg/L)
Total
0.00007
0.0012
0.0012
0.0001
4.1E-05
0.00005
0.0003
0.0001
0.0001
0.0053
0.002
9.5E-05
0.0022
6.1E-05
0.0002
0.0002
0.00022
0.0005
0.0001
0.0006
0.00101
0.0004
0.0002
0.0002
0.0005
0.0004
0.00006
0.0003
0.0001
0.0004
0.0012
0.0001
0.002
0.003
0.0002
0.0003
0.00105
0.0001
0.002
0.00048
4.2E-05
0.00021
0.001
4.1E-05
GW
0.00012
0.002
0.0019
0.0001
4.1E-05
0.00035
0.0003
0.0001
0.0001
0.0053
0.002
9.5E-05
0.0022
6.1E-05
0.001
0.0002
0.00022
0.0005
0.0001
0.0006
0.00106
0.0004
0.0002
0.0002
0.0005
0.0007
0.00006
0.0003
0.00011
0.00153
0.0012
0.002
0.002
0.003
0.0002
0.0011
0.00105
0.0001
0.002
0.00048
4.2E-05
0.00029
0.001
4.1E-05
SW
0.00007
0.0012
0.0012
0.0007
4.2E-05
0.00005
0.0006
0.0001
0.0002
0.002
0.001
0.0003
0.0002
0.0002
0.0005
0.0005
0.0001
0.00097
0.00101
0.001
0.0002
0.0004
0.0005
0.001
0.0001
0.0004
0.0028
0.0001
0.002
0.0003
0.0003
0.00121
0.0003
0.002
0.0002
0.00021
0.0013
4.2E-05
Median Detect
Concentration (mg/L)
Total
0.00139
0.003
0.002
0.003
0.00058
0.001
0.002
0.0002
0.0015
0.0053
0.002
0.001
0.00305
0.00072
0.002
0.002
0.002
0.0021
0.0001
0.00082
0.00135
0.002
0.0027
0.00121
0.003
0.002
0.001
0.003
0.0013
0.0031
0.002
0.0018
0.002
0.00825
0.0006
0.002
0.00153
0.0058
0.002
0.003
0.00101
0.005
0.00165
0.001
GW
0.00207
0.003
0.004
0.00315
0.001
0.001
0.002
0.0002
0.00125
0.0053
0.002
0.001
0.00305
0.0009
0.0025
0.002
0.005
0.0021
0.0001
0.00081
0.00139
0.002
0.003
0.00121
0.003
0.002
0.001
0.003
0.0018
0.0032
0.0016
0.00275
0.002
0.00825
0.001
0.0014
0.0017
0.0058
0.002
0.003
0.0011
0.005
0.002
0.00079
SW
0.00048
0.003
0.002
0.0012
0.00029
0.001
0.0009
0.0001
0.002
0.002
0.0035
0.00049
0.002
0.0021
0.001
0.0024
0.0002
0.00097
0.00112
0.0025
0.001
0.002
0.0013
0.002
0.00074
0.003
0.0028
0.00014
0.0035
0.00035
0.002
0.00133
0.0059
0.002
0.0003
0.0025
0.0013
0.00155
90th Percentile Detect
Concentration (mg/L)
Total
0.004
0.00775
0.004
0.005
0.01
0.004
0.006
0.0024
0.0038
0.0053
0.002
0.004
0.023
0.0048
0.005
0.006
0.0059
0.01
0.0004
0.00189
0.0031
0.02
0.005
0.00548
0.0065
0.0069
0.0055
0.01
0.006
0.00502
0.0028
0.0045
0.005
0.03
0.002
0.00335
0.003
0.0084
0.002
0.01
0.0032
0.005
0.006
0.006
GW
0.004
0.00688
0.004
0.005
0.01
0.004
0.006
0.0035
0.0039
0.0053
0.002
0.003
0.023
0.005
0.005
0.004
0.009
0.01
0.0004
0.00189
0.0032
0.02
0.005
0.00548
0.0065
0.007
0.006
0.01
0.005
0.0054
0.002
0.006
0.004
0.03
0.002
0.0068
0.003
0.0071
0.002
0.01
0.0033
0.005
0.006
0.006
SW
0.003
0.01
0.003
0.0037
0.009
0.0037
0.06
0.0007
0.0036
0.002
0.005
0.0022
0.004
0.0061
0.003
0.01
0.0003
0.00097
0.00163
0.004
0.004
0.003
0.003
0.003
0.007
0.0043
0.0028
0.0024
0.005
0.0004
0.0033
0.0053
0.0085
0.002
0.0006
0.005
0.0013
0.0071
Maximum Detect
Concentration (mg/L)
Total
0.00523
0.01
0.004
0.0091
0.05
0.02
0.06
0.004
0.006
0.0053
0.002
0.006
0.04
0.03
0.05
0.01
0.01
0.06
0.05
0.0051
0.00441
0.03
0.02
0.00733
0.01
0.05
0.04
0.04
0.01
0.0088
0.0028
0.006
0.005
0.04
0.005
0.0068
0.0053
0.01
0.002
0.01
0.03
0.006
0.006
0.06
GW
0.00523
0.00775
0.004
0.0091
0.05
0.02
0.006
0.004
0.006
0.0053
0.002
0.006
0.04
0.03
0.0069
0.01
0.01
0.06
0.05
0.0051
0.00441
0.03
0.02
0.00733
0.01
0.05
0.04
0.04
0.01
0.0088
0.002
0.006
0.004
0.04
0.005
0.0068
0.0035
0.01
0.002
0.01
0.03
0.005
0.006
0.06
SW
0.003
0.01
0.003
0.004
0.04
0.006
0.06
0.0007
0.0036
0.002
0.005
0.003
0.05
0.0081
0.01
0.01
0.0007
0.00097
0.00163
0.004
0.0083
0.0032
0.003
0.005
0.01
0.0043
0.0028
0.0024
0.005
0.0004
0.0056
0.0053
0.01
0.002
0.0026
0.006
0.0013
0.06
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A3b. Antimony — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
609
352
453
1,052
3,819
837
1,170
281
1,332
1,592
107
965
924
1,241
1,621
242
676
1,037
802
3,032
1,593
1,420
849
2,284
217
743
1,216
1,374
724
335
1,548
1,929
202
731
142
823
234
351
4,888
507
1,582
601
1,823
452
304
49,016
GW
467
279
381
1,004
3,294
616
1,131
278
1,306
1,478
95
932
875
1,140
1,572
93
558
969
748
2,979
1,564
1,343
789
2,145
190
732
1,175
1,337
685
314
1,312
1,804
175
610
133
758
223
162
4,547
457
1,414
558
1,803
291
255
44,971
SW
142
73
72
48
525
221
39
3
26
114
12
33
49
101
49
149
118
68
54
53
29
77
60
139
27
11
41
37
39
21
236
125
27
121
9
65
11
189
341
50
168
43
20
161
49
4,045
Total Population Served by Systems
Reporting
Total
592,810
4,701,100
2,452,800
6,159,405
36,232,443
4,996,481
2,716,176
679,823
17,247,583
7,239,616
1,303,767
2,499,680
1,078,426
9,078,639
4,977,274
4,602,489
8,525,575
5,022,431
727,134
6,717,080
4,265,162
3,006,718
757,930
6,973,609
563,069
1,450,223
942,517
7,762,423
1,667,433
973,342
4,385,092
10,221,998
749,266
2,770,064
913,384
3,468,333
339,259
5,685,258
25,060,220
2,543,652
4,803,450
490,989
4,044,416
1,416,939
446,184
223,251,662
GW
230,950
1,463,066
909,774
2,788,814
13,516,569
531,250
382,254
398,423
15,001,541
1,347,285
1,249,139
1,391,054
833,516
2,879,411
2,616,819
375,460
1,718,151
1,024,324
291,530
1,924,649
3,015,521
1,692,257
365,261
1,708,443
257,844
673,743
392,718
2,726,477
1,400,885
283,451
1,212,438
3,127,061
276,712
486,818
173,406
809,806
247,298
1,462,502
9,275,719
1,686,017
634,384
227,021
2,352,672
236,149
129,168
85,727,750
SW
361,860
3,238,034
1,543,026
3,370,591
22,715,874
4,465,231
2,333,922
281,400
2,246,042
5,892,331
54,628
1,108,626
244,910
6,199,228
2,360,455
4,227,029
6,807,424
3,998,107
435,604
4,792,431
1,249,641
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,172,654
7,094,937
472,554
2,283,246
739,978
2,658,527
91,961
4,222,756
15,784,501
857,635
4,169,066
263,968
1,691,744
1,180,790
317,016
137,523,912
Percent of Systems
with At Least One Detection
Total
3.448%
2.841%
1.545%
4.753%
3.640%
12.664%
3.333%
7.473%
7.808%
0.063%
0.000%
0.415%
5.303%
0.806%
4.874%
28.512%
6.065%
2.314%
7.980%
38.061%
6.340%
1.479%
2.591%
5.298%
0.000%
2.557%
1.563%
3.057%
5.110%
17.313%
3.941%
1.555%
1.485%
1.094%
5.634%
0.972%
10.256%
4.558%
0.368%
13.412%
0.379%
1.830%
11.135%
6.416%
1.645%
5.978%
GW
3.212%
1.792%
0.787%
4.582%
3.066%
8.766%
3.006%
6.475%
7.580%
0.068%
0.000%
0.215%
5.371%
0.877%
4.326%
22.581%
5.197%
2.064%
8.155%
37.160%
6.394%
1.266%
2.535%
4.103%
0.000%
2.596%
1.617%
2.842%
4.818%
16.561%
3.430%
1.386%
1.143%
0.656%
4.511%
1.055%
9.865%
3.704%
0.286%
12.473%
0.354%
1.971%
10.871%
7.560%
1.569%
5.677%
SW
4.225%
6.849%
5.556%
8.333%
7.238%
23.529%
12.821%
100.000%
19.231%
0.000%
0.000%
6.061%
4.082%
0.000%
22.449%
32.215%
10.169%
5.882%
5.556%
88.679%
3.448%
5.195%
3.333%
23.741%
0.000%
0.000%
0.000%
10.811%
10.256%
28.571%
6.780%
4.000%
3.704%
3.306%
22.222%
0.000%
18.182%
5.291%
1.466%
22.000%
0.595%
0.000%
35.000%
4.348%
2.041%
9.320%
Percent of Population Served
with At Least One Detection
Total
1.523%
17.155%
3.471%
35.270%
15.551%
31.345%
19.393%
51.005%
35.873%
0.001%
0.000%
1.295%
9.112%
0.308%
24.214%
24.825%
47.453%
36.562%
3.441%
86.541%
5.268%
7.403%
15.403%
28.279%
0.000%
3.226%
3.278%
22.689%
7.416%
53.728%
6.185%
2.006%
6.051%
4.843%
53.119%
1.200%
6.557%
11.093%
6.176%
43.925%
0.113%
0.353%
42.715%
2.054%
8.059%
19.208%
GW
1.876%
1.874%
0.225%
11.424%
16.235%
14.389%
4.647%
16.400%
36.321%
0.003%
0.000%
1.957%
11.749%
0.971%
8.574%
13.184%
3.991%
1.598%
4.237%
55.110%
6.290%
1.860%
23.425%
7.510%
0.000%
6.945%
7.867%
11.628%
3.203%
42.017%
4.036%
0.407%
8.266%
0.109%
3.956%
5.140%
7.620%
7.998%
14.181%
32.136%
0.456%
0.764%
25.323%
1.543%
1.027%
15.708%
SW
1.297%
24.059%
5.384%
55.000%
15.144%
33.362%
21.809%
100.000%
32.877%
0.000%
0.000%
0.463%
0.139%
0.000%
41.553%
25.859%
58.423%
45.520%
2.909%
99.164%
2.803%
14.541%
7.941%
35.019%
0.000%
0.000%
0.000%
28.678%
29.557%
58.540%
7.006%
2.711%
4.754%
5.852%
64.640%
0.000%
3.697%
12.165%
1.471%
67.101%
0.061%
0.000%
66.903%
2.156%
10.925%
21.390%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A3c. Antimony— Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.006 mg/L
Total
0
3
0
1
45
3
1
0
0
0
0
0
0
1
2
3
3
4
7
1
0
0
2
6
0
1
4
6
3
6
7
1
0
0
0
3
0
1
0
11
0
2
3
0
0
130
GW
0
1
0
1
30
3
0
0
0
0
0
0
0
1
2
1
1
3
6
1
0
0
2
4
0
1
4
6
3
6
4
1
0
0
0
3
0
1
0
7
0
2
3
0
0
97
SW
0
2
0
0
15
0
1
0
0
0
0
0
0
0
0
2
2
1
1
0
0
0
0
2
0
0
0
0
0
0
3
0
0
0
0
0
0
0
0
4
0
0
0
0
0
33
Percent of Systems
with At Least One Detection
> 0.006 mg/L
Total
0.000%
0.852%
0.000%
0.095%
1.178%
0.358%
0.085%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.081%
0.123%
1.240%
0.444%
0.386%
0.873%
0.033%
0.000%
0.000%
0.236%
0.263%
0.000%
0.135%
0.329%
0.437%
0.414%
1.791%
0.452%
0.052%
0.000%
0.000%
0.000%
0.365%
0.000%
0.285%
0.000%
2.170%
0.000%
0.333%
0.165%
0.000%
0.000%
0.265%
GW
0.000%
0.358%
0.000%
0.100%
0.911%
0.487%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.088%
0.127%
1.075%
0.179%
0.310%
0.802%
0.034%
0.000%
0.000%
0.253%
0.186%
0.000%
0.137%
0.340%
0.449%
0.438%
1.911%
0.305%
0.055%
0.000%
0.000%
0.000%
0.396%
0.000%
0.617%
0.000%
1.532%
0.000%
0.358%
0.166%
0.000%
0.000%
0.216%
SW
0.000%
2.740%
0.000%
0.000%
2.857%
0.000%
2.564%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.342%
1.695%
1.471%
1.852%
0.000%
0.000%
0.000%
0.000%
1.439%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.271%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
8.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.816%
Population Served by Systems
with At Least One Detection
> 0.006 mg/L
Total
0
56,892
0
19,760
1,089,681
1,723
58,691
0
0
0
0
0
0
15,933
425
61,163
110,521
1,711,370
2,571
50
0
0
1,090
27,114
0
1,640
6,224
1,425
15,846
6,599
130,032
255
0
0
0
758
0
12,703
0
27,423
0
70
547
0
0
3,360,506
GW
0
600
0
19,760
140,298
1,723
0
0
0
0
0
0
0
15,933
425
6,161
7,000
1,370
771
50
0
0
1,090
3,230
0
1,640
6,224
1,425
15,846
6,599
1,315
255
0
0
0
758
0
12,703
0
5,900
0
70
547
0
0
251,693
SW
0
56,292
0
0
949,383
0
58,691
0
0
0
0
0
0
0
0
55,002
103,521
1,710,000
1,800
0
0
0
0
23,884
0
0
0
0
0
0
128,717
0
0
0
0
0
0
0
0
21,523
0
0
0
0
0
3,108,813
Percent of Population Served
with At Least One Detection
> 0.006 mg/L
Total
0.000%
1.210%
0.000%
0.321%
3.007%
0.034%
2.161%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.175%
0.009%
1.329%
1.296%
34.075%
0.354%
0.001%
0.000%
0.000%
0.144%
0.389%
0.000%
0.113%
0.660%
0.018%
0.950%
0.678%
2.965%
0.002%
0.000%
0.000%
0.000%
0.022%
0.000%
0.223%
0.000%
1.078%
0.000%
0.014%
0.014%
0.000%
0.000%
1.505%
GW
0.000%
0.041%
0.000%
0.709%
1.038%
0.324%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.553%
0.016%
1.641%
0.407%
0.134%
0.264%
0.003%
0.000%
0.000%
0.298%
0.189%
0.000%
0.243%
1.585%
0.052%
1.131%
2.328%
0.108%
0.008%
0.000%
0.000%
0.000%
0.094%
0.000%
0.869%
0.000%
0.350%
0.000%
0.031%
0.023%
0.000%
0.000%
0.294%
SW
0.000%
1.738%
0.000%
0.000%
4.179%
0.000%
2.515%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.301%
1.521%
42.770%
0.413%
0.000%
0.000%
0.000%
0.000%
0.454%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.057%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.510%
0.000%
0.000%
0.000%
0.000%
0.000%
2.261%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A3d. Antimony — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.003 mg/L
Total
8
6
3
30
63
23
17
2
30
1
0
0
12
9
18
31
20
20
18
15
3
3
8
69
0
3
13
18
6
13
23
19
0
2
3
8
2
5
3
41
0
6
34
20
1
629
GW
7
2
2
28
45
14
15
2
29
1
0
0
10
9
17
12
13
17
16
15
3
3
7
55
0
3
13
16
5
12
18
16
0
2
2
8
2
1
2
33
0
6
34
16
1
512
SW
1
4
1
2
18
9
2
0
1
0
0
0
2
0
1
19
7
3
2
0
0
0
1
14
0
0
0
2
1
1
5
3
0
0
1
0
0
4
1
8
0
0
0
4
0
117
Percent of Systems
with At Least One Detection
> 0.003 mg/L
Total
1.314%
1.705%
0.662%
2.852%
1.650%
2.748%
1.453%
0.712%
2.252%
0.063%
0.000%
0.000%
1.299%
0.725%
1.110%
12.810%
2.959%
1.929%
2.244%
0.495%
0.188%
0.211%
0.942%
3.021%
0.000%
0.404%
1.069%
1.310%
0.829%
3.881%
1.486%
0.985%
0.000%
0.274%
2.113%
0.972%
0.855%
1.425%
0.061%
8.087%
0.000%
0.998%
1.865%
4.425%
0.329%
1.283%
GW
1.499%
0.717%
0.525%
2.789%
1.366%
2.273%
1.326%
0.719%
2.221%
0.068%
0.000%
0.000%
1.143%
0.789%
1.081%
12.903%
2.330%
1.754%
2.139%
0.504%
0.192%
0.223%
0.887%
2.564%
0.000%
0.410%
1.106%
1.197%
0.730%
3.822%
1.372%
0.887%
0.000%
0.328%
1.504%
1.055%
0.897%
0.617%
0.044%
7.221%
0.000%
1.075%
1.886%
5.498%
0.392%
1.139%
SW
0.704%
5.479%
1.389%
4.167%
3.429%
4.072%
5.128%
0.000%
3.846%
0.000%
0.000%
0.000%
4.082%
0.000%
2.041%
12.752%
5.932%
4.412%
3.704%
0.000%
0.000%
0.000%
1.667%
10.072%
0.000%
0.000%
0.000%
5.405%
2.564%
4.762%
2.119%
2.400%
0.000%
0.000%
11.111%
0.000%
0.000%
2.116%
0.293%
16.000%
0.000%
0.000%
0.000%
2.484%
0.000%
2.892%
Population Served by Systems
with At Least One Detection
> 0.003 mg/L
Total
2,610
130,152
72,873
330,593
1,682,895
181,666
68,787
5,120
323,928
46
0
0
43,912
27,626
30,392
327,962
3,886,128
1,834,740
4,950
5,076
12,007
941
41,212
213,352
0
27,327
7,859
1,104,325
92,536
24,859
165,959
95,509
0
402
54,570
41,627
746
473,680
15,527
615,153
0
880
154,129
19,416
60
12,121,532
GW
2,260
12,559
1,712
150,343
285,175
27,520
6,964
5,120
222,045
46
0
0
43,572
27,626
19,322
26,330
57,204
14,983
2,087
5,076
12,007
941
10,057
76,540
0
27,327
7,859
29,253
19,835
16,559
36,652
5,289
0
402
3,820
41,627
746
12,703
10,077
433,108
0
880
154,129
2,903
60
1,812,718
SW
350
117,593
71,161
180,250
1,397,720
154,146
61,823
0
101,883
0
0
0
340
0
11,070
301,632
3,828,924
1,819,757
2,863
0
0
0
31,155
136,812
0
0
0
1,075,072
72,701
8,300
129,307
90,220
0
0
50,750
0
0
460,977
5,450
182,045
0
0
0
16,513
0
10,308,814
Percent of Population Served
with At Least One Detection
> 0.003 mg/L
Total
0.440%
2.769%
2.971%
5.367%
4.645%
3.636%
2.532%
0.753%
1.878%
0.001%
0.000%
0.000%
4.072%
0.304%
0.611%
7.126%
45.582%
36.531%
0.681%
0.076%
0.282%
0.031%
5.437%
3.059%
0.000%
1.884%
0.834%
14.227%
5.550%
2.554%
3.785%
0.934%
0.000%
0.015%
5.974%
1.200%
0.220%
8.332%
0.062%
24.184%
0.000%
0.179%
3.811%
1.370%
0.013%
5.430%
GW
0.979%
0.858%
0.188%
5.391%
2.110%
5.180%
1.822%
1.285%
1.480%
0.003%
0.000%
0.000%
5.227%
0.959%
0.738%
7.013%
3.329%
1.463%
0.716%
0.264%
0.398%
0.056%
2.753%
4.480%
0.000%
4.056%
2.001%
1.073%
1.416%
5.842%
3.023%
0.169%
0.000%
0.083%
2.203%
5.140%
0.302%
0.869%
0.109%
25.688%
0.000%
0.388%
6.551%
1.229%
0.046%
2.115%
SW
0.097%
3.632%
4.612%
5.348%
6.153%
3.452%
2.649%
0.000%
4.536%
0.000%
0.000%
0.000%
0.139%
0.000%
0.469%
7.136%
56.246%
45.515%
0.657%
0.000%
0.000%
0.000%
7.934%
2.598%
0.000%
0.000%
0.000%
21.348%
27.275%
1.203%
4.076%
1.272%
0.000%
0.000%
6.858%
0.000%
0.000%
10.916%
0.035%
21.226%
0.000%
0.000%
0.000%
1.398%
0.000%
7.496%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A4. Arsenic — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration or
Threshold of
Interest
> 0.05 mg/L
> 0.025 mg/L
>0.01 mg/L
> 0.005 mg/L
> 0.05 mg/L
> 0.025 mg/L
> 0.01 mg/L
> 0.005 mg/L
> 0.05 mg/L
> 0.025 mg/L
>0.01 mg/L
> 0.005 mg/L
Total # Systems
Reporting
45,387
45,387
45,387
45,387
4,086
4,086
4,086
4,086
49,473
49,473
49,473
49,473
# Systems Exceeding
Threshold of Interest
346
1,216
3,364
7,859
25
55
152
369
371
1,271
3,516
8,228
% Systems Exceeding
Threshold of Interest
0.762%
2.679%
7.412%
17.316%
0.612%
1.346%
3.720%
9.031%
0.750%
2.569%
7.107%
16.631%
Total Pop. Served by
Systems Reporting
85,737,044
85,737,044
85,737,044
85,737,044
144,656,184
144,656,184
144,656,184
144,656,184
230,393,228
230,393,228
230,393,228
230,393,228
Total Pop. Served by
Systems Exceeding
Threshold of Interest
1,352,250
3,901,453
8,655,516
18,464,077
1,503,598
7,158,650
15,741,605
28,990,530
2,855,848
11,060,103
24,397,121
47,454,607
% Pop. Served by
Systems Exceeding
Threshold of Interest
1.577%
4.550%
10.095%
21.536%
1.039%
4.949%
10.882%
20.041%
1.240%
4.801%
10.589%
20.597%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A4a. Arsenic — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
2084
2670
2221
7709
51056
4447
2606
786
2171
2706
1177
3008
4655
3444
4914
1772
3845
5296
3260
13055
5604
5718
3530
9288
632
2107
4265
6749
3680
3622
3498
5664
431
2324
948
2100
328
1832
16814
7407
2830
2299
7143
1196
1144
224,035
GW
1393
1814
1567
6165
32918
2426
1883
738
2100
2382
1115
2682
3877
3044
4425
535
2647
4178
2857
12835
5524
4937
3031
7838
567
2023
4088
6017
3209
2908
2638
4731
351
1634
713
1833
313
624
14093
5822
2220
1932
6972
481
884
176,964
SW
691
856
654
1544
18138
2021
723
48
71
324
62
326
778
400
489
1237
1198
1118
403
220
80
781
499
1450
65
84
177
732
471
714
860
933
80
690
235
267
15
1208
2721
1585
610
367
171
715
260
47,071
Percent of Samples
with Detections
Total
33.541%
1.423%
1.981%
70.567%
50.061%
19.271%
3.761%
44.784%
20.405%
1.293%
0.000%
32.148%
33.319%
51.249%
27.859%
6.546%
16.619%
19.279%
57.025%
78.192%
52.052%
8.569%
25.297%
1.981%
74.051%
76.222%
52.145%
7.453%
72.853%
73.771%
7.547%
24.629%
37.819%
31.454%
6.857%
1.524%
47.866%
4.694%
34.311%
56.595%
5.300%
12.440%
21.126%
4.599%
11.014%
36.904%
GW
42.355%
1.323%
2.680%
68.532%
58.664%
27.288%
4.886%
44.715%
20.714%
1.469%
0.000%
32.364%
35.414%
52.102%
29.740%
5.794%
18.549%
22.451%
62.023%
78.255%
52.679%
7.839%
26.658%
2.143%
76.014%
77.261%
53.694%
6.465%
75.382%
75.138%
7.619%
28.387%
36.467%
41.554%
9.116%
1.746%
48.243%
4.006%
35.521%
56.905%
6.667%
14.700%
21.285%
7.069%
11.538%
39.904%
SW
15.774%
1.636%
0.306%
78.692%
34.447%
9.649%
0.830%
45.833%
11.268%
0.000%
0.000%
30.368%
22.879%
44.750%
10.838%
6.871%
12.354%
7.424%
21.588%
74.545%
8.750%
13.188%
17.034%
1.103%
56.923%
51.190%
16.384%
15.574%
55.626%
68.207%
7.326%
5.573%
43.750%
7.536%
0.000%
0.000%
40.000%
5.050%
28.041%
55.457%
0.328%
0.545%
14.620%
2.937%
9.231%
25.627%
Minimum Detect
Concentration (mg/L)
Total
0.00016
0.0001
0.0017
0.0005
9.3E-05
0.00006
0.0007
0.0001
0.0001
0.0051
0.0009
0.0001
5.8E-05
0.0003
0.00041
0.0004
0.0001
0.0005
0.0001
0.001
0.001
0.0004
0.0005
0.001
0.00013
0.0007
0.0001
0.0001
0.00049
0.0001
0.001
0.0015
0.0005
0.00011
0.0051
0.001
0.001
0.002
0.0001
0.002
0.001
0.00014
0.00007
0.0007
5.8E-05
GW
0.00017
0.00049
0.0017
0.0005
9.3E-05
0.0001
0.001
0.0001
0.0001
0.0051
0.0009
0.0002
5.8E-05
0.0005
0.0005
0.0005
0.0006
0.0005
0.0001
0.001
0.001
0.0004
0.001
0.001
0.00013
0.0007
0.0003
0.0001
0.001
0.0001
0.001
0.0015
0.0005
0.00011
0.0051
0.001
0.001
0.002
0.0003
0.002
0.001
0.00014
0.0005
0.001
5.8E-05
SW
0.00016
0.0001
0.0021
0.0005
0.00023
0.00006
0.0007
0.0001
0.0005
0.001
0.0001
0.0005
0.0003
0.00041
0.0004
0.0001
0.0005
0.0002
0.00104
0.001
0.001
0.0005
0.001
0.0021
0.001
0.0001
0.0003
0.00049
0.001
0.001
0.0016
0.0005
0.001
0.001
0.002
0.0001
0.002
0.001
0.0006
0.00007
0.0007
0.00006
Median Detect
Concentration (mg/L)
Total
0.007
0.00179
0.0033
0.007
0.005
0.0033
0.008
0.0009
0.0019
0.0071
0.003
0.007
0.0034
0.0044
0.003
0.01
0.007
0.005
0.005
0.0044
0.00145
0.002
0.006
0.0039
0.00461
0.01
0.0039
0.003
0.0097
0.005
0.0096
0.0056
0.0029
0.02
0.01
0.006
0.00395
0.0045
0.0027
0.004
0.004
0.0034
0.0032
0.006
0.005
GW
0.008
0.00199
0.0033
0.007
0.006
0.005
0.00918
0.001
0.0019
0.0071
0.004
0.008
0.00465
0.0046
0.004
0.01
0.00765
0.005
0.005
0.0044
0.00153
0.002
0.006
0.00416
0.00462
0.01
0.004
0.003
0.01
0.007
0.0096
0.0045
0.0029
0.02
0.01
0.006
0.0033
0.005
0.0027
0.004
0.004
0.0034
0.005
0.006
0.00546
SW
0.00145
0.00146
0.00405
0.0069
0.0033
0.00134
0.0014
0.0005
0.0017
0.001
0.006
0.001
0.0017
0.002
0.006
0.001
0.0007
0.001
0.0013
0.0013
0.003
0.004
0.00192
0.00429
0.0046
0.002
0.005
0.004
0.0012
0.0076
0.01
0.003
0.00195
0.004
0.0033
0.002
0.0025
0.0015
0.0011
0.0005
0.0065
0.0033
90th Percentile Detect
Concentration (mg/L)
Total
0.03
0.01
0.0098
0.02
0.02
0.04
0.04
0.009
0.009
0.01
0.02
0.02
0.02
0.01
0.008
0.04
0.01
0.02
0.02
0.02
0.00486
0.01
0.03
0.02
0.00889
0.04
0.01
0.01
0.05
0.03
0.05
0.04
0.01
0.02
0.05
0.01
0.01
0.01
0.01
0.01
0.03
0.00925
0.01
0.01
0.02
GW
0.03
0.01
0.0098
0.03
0.02
0.05
0.04
0.009
0.0091
0.01
0.02
0.02
0.02
0.01
0.008
0.04
0.01
0.02
0.02
0.02
0.005
0.01
0.03
0.02
0.009
0.04
0.01
0.01
0.05
0.03
0.04
0.03
0.01
0.02
0.05
0.01
0.02
0.01
0.01
0.01
0.03
0.0093
0.01
0.01
0.02
SW
0.01
0.006
0.006
0.01
0.01
0.005
0.003
0.0016
0.009
0.003
0.01
0.002
0.0053
0.008
0.02
0.002
0.005
0.003
0.00344
0.0026
0.02
0.01
0.00547
0.0072
0.01
0.009
0.05
0.01
0.0031
0.12
0.07
0.01
0.002
0.009
0.0078
0.01
0.003
0.002
0.0042
0.0032
0.01
0.01
Maximum Detect
Concentration (mg/L)
Total
0.18
0.05
0.03
0.25
0.39
0.09
0.07
0.04
0.24
0.06
0.27
0.48
0.12
0.07
0.01
0.08
0.25
0.39
0.43
0.07
0.03
0.11
0.05
0.15
0.06
0.75
0.03
0.5
0.32
0.19
0.42
0.1
0.17
0.03
0.09
0.02
0.03
0.18
0.24
0.03
0.05
0.11
0.03
0.04
0.75
GW
0.18
0.05
0.03
0.25
0.39
0.09
0.07
0.04
0.24
0.06
0.27
0.48
0.12
0.07
0.01
0.08
0.25
0.39
0.43
0.07
0.03
0.11
0.05
0.15
0.06
0.75
0.03
0.5
0.32
0.19
0.12
0.08
0.17
0.03
0.09
0.02
0.03
0.18
0.24
0.03
0.05
0.11
0.03
0.04
0.75
SW
0.15
0.0069
0.006
0.13
0.26
0.01
0.003
0.01
0.009
0.005
0.07
0.04
0.02
0.01
0.05
0.005
0.02
0.02
0.00344
0.01
0.1
0.01
0.01
0.01
0.02
0.02
0.44
0.1
0.01
0.42
0.1
0.02
0.002
0.03
0.03
0.07
0.003
0.002
0.009
0.01
0.03
0.44
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A4b. Arsenic —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
614
352
453
1,057
3,860
830
1,170
281
1,335
1,593
107
1,043
932
1,255
1,624
242
686
1,032
809
3,161
1,593
1,420
830
2,283
217
738
1,224
1,374
724
338
1,579
1,929
208
1,105
143
595
189
351
4,912
507
1,582
601
1,826
465
304
49,473
GW
468
279
381
1,009
3,336
609
1,131
278
1,309
1,479
95
1,010
874
1,154
1,575
93
568
964
755
3,107
1,564
1,343
770
2,144
190
727
1,183
1,337
685
317
1,339
1,804
176
952
134
542
181
162
4,570
457
1,414
557
1,806
304
255
45,387
SW
146
73
72
48
524
221
39
3
26
114
12
33
58
101
49
149
118
68
54
54
29
77
60
139
27
11
41
37
39
21
240
125
32
153
9
53
8
189
342
50
168
44
20
161
49
4,086
Total Population Served by Systems
Reporting
Total
604,242
4,701,100
2,452,800
6,163,221
36,251,169
4,995,552
2,716,176
679,823
17,374,779
7,242,523
1,303,767
2,540,170
1,093,108
9,087,280
4,980,359
4,602,489
8,530,298
5,020,682
728,132
6,982,875
4,265,162
3,006,718
754,605
6,973,518
563,069
1,451,422
943,715
7,762,423
1,667,433
973,480
11,205,386
10,221,998
771,000
2,941,297
913,584
3,127,334
280,317
5,685,258
25,069,082
2,543,652
4,803,590
493,135
4,044,712
1,434,609
446,184
230,393,228
GW
231,088
1,463,066
909,774
2,792,630
13,421,000
530,321
382,254
398,423
15,128,737
1,350,192
1,249,139
1,431,544
836,746
2,888,052
2,619,904
375,460
1,722,874
1,022,575
292,528
1,985,967
3,015,521
1,692,257
361,936
1,708,352
257,844
674,942
393,916
2,726,477
1,400,885
283,589
1,225,943
3,127,061
278,233
575,817
173,606
572,473
205,756
1,462,502
9,284,197
1,686,017
634,524
226,967
2,352,968
253,819
129,168
85,737,044
SW
373,154
3,238,034
1,543,026
3,370,591
22,830,169
4,465,231
2,333,922
281,400
2,246,042
5,892,331
54,628
1,108,626
256,362
6,199,228
2,360,455
4,227,029
6,807,424
3,998,107
435,604
4,996,908
1,249,641
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
9,979,443
7,094,937
492,767
2,365,480
739,978
2,554,861
74,561
4,222,756
15,784,885
857,635
4,169,066
266,168
1,691,744
1,180,790
317,016
144,656,184
Percent of Systems
with At Least One Detection
Total
50.326%
6.818%
4.857%
88.363%
56.114%
33.494%
6.667%
55.872%
21.498%
1.444%
0.000%
34.612%
49.249%
48.207%
41.687%
38.843%
18.950%
21.221%
67.491%
85.258%
53.986%
17.042%
30.120%
4.862%
80.184%
85.501%
46.078%
15.066%
84.392%
81.657%
9.373%
25.713%
31.250%
40.724%
2.098%
0.840%
41.270%
12.251%
35.464%
79.487%
6.384%
17.304%
40.854%
8.602%
17.763%
37.329%
GW
52.778%
5.018%
5.249%
88.206%
56.535%
33.333%
6.543%
55.396%
21.467%
1.555%
0.000%
33.267%
50.686%
46.360%
41.651%
26.882%
18.838%
21.680%
68.212%
85.356%
54.668%
14.669%
28.571%
4.571%
81.579%
85.695%
47.168%
14.660%
85.109%
81.388%
8.140%
26.552%
35.227%
44.853%
2.239%
0.923%
41.436%
8.025%
34.661%
81.619%
7.001%
18.492%
40.642%
9.211%
17.255%
37.788%
SW
42.466%
13.699%
2.778%
91.667%
53.435%
33.937%
10.256%
100.000%
23.077%
0.000%
0.000%
75.758%
27.586%
69.307%
42.857%
46.309%
19.492%
14.706%
57.407%
79.630%
17.241%
58.442%
50.000%
9.353%
70.370%
72.727%
14.634%
29.730%
71.795%
85.714%
16.250%
13.600%
9.375%
15.033%
0.000%
0.000%
37.500%
15.873%
46.199%
60.000%
1.190%
2.273%
60.000%
7.453%
20.408%
32.232%
Percent of Population Served
with At Least One Detection
Total
73.802%
7.438%
3.678%
97.169%
88.844%
37.608%
7.420%
76.466%
48.773%
0.408%
0.000%
47.546%
70.646%
80.802%
47.869%
58.296%
54.989%
39.457%
79.568%
97.294%
45.926%
38.284%
60.882%
14.120%
81.725%
95.398%
32.036%
52.179%
92.273%
98.302%
3.218%
9.872%
42.851%
42.896%
0.437%
0.032%
38.278%
19.313%
49.544%
86.461%
4.601%
9.525%
60.801%
5.456%
31.592%
49.309%
GW
65.470%
5.216%
6.432%
93.839%
83.209%
42.476%
9.366%
59.844%
52.360%
2.190%
0.000%
38.453%
66.454%
56.310%
37.817%
59.288%
17.106%
20.355%
70.933%
93.941%
63.826%
40.185%
46.425%
4.810%
87.499%
92.031%
42.732%
26.331%
97.015%
94.487%
6.757%
18.497%
46.323%
56.243%
2.301%
0.172%
49.407%
4.883%
41.222%
93.091%
17.881%
20.484%
45.697%
16.889%
20.595%
50.451%
SW
78.962%
8.442%
2.055%
99.927%
92.156%
37.030%
7.101%
100.000%
24.610%
0.000%
0.000%
59.288%
84.331%
92.212%
59.027%
58.208%
64.577%
44.343%
85.366%
98.626%
2.733%
35.836%
74.206%
17.141%
76.847%
98.325%
24.373%
66.173%
67.347%
99.871%
2.784%
6.071%
40.891%
39.647%
0.000%
0.000%
7.567%
24.310%
54.438%
73.426%
2.580%
0.180%
81.808%
2.999%
36.073%
48.633%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A4c. Arsenic — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.05 mg/L
Total
17
1
0
43
76
3
1
0
1
1
0
7
9
9
4
0
8
3
15
47
4
0
6
1
2
1
36
0
11
27
3
8
3
3
0
2
0
0
10
7
0
1
1
0
0
371
GW
15
1
0
41
65
3
1
0
1
1
0
7
8
9
4
0
6
3
15
47
4
0
5
1
2
1
36
0
10
25
3
7
2
3
0
2
0
0
10
6
0
1
1
0
0
346
SW
2
0
0
2
11
0
0
0
0
0
0
0
1
0
0
0
2
0
0
0
0
0
1
0
0
0
0
0
1
2
0
1
1
0
0
0
0
0
0
1
0
0
0
0
0
25
Percent of Systems
with At Least One Detection
> 0.05 mg/L
Total
2.769%
0.284%
0.000%
4.068%
1.969%
0.361%
0.085%
0.000%
0.075%
0.063%
0.000%
0.671%
0.966%
0.717%
0.246%
0.000%
1.166%
0.291%
1.854%
1.487%
0.251%
0.000%
0.723%
0.044%
0.922%
0.136%
2.941%
0.000%
1.519%
7.988%
0.190%
0.415%
1.442%
0.271%
0.000%
0.336%
0.000%
0.000%
0.204%
1.381%
0.000%
0.166%
0.055%
0.000%
0.000%
0.750%
GW
3.205%
0.358%
0.000%
4.063%
1.948%
0.493%
0.088%
0.000%
0.076%
0.068%
0.000%
0.693%
0.915%
0.780%
0.254%
0.000%
1.056%
0.311%
1.987%
1.513%
0.256%
0.000%
0.649%
0.047%
1.053%
0.138%
3.043%
0.000%
1.460%
7.886%
0.224%
0.388%
1.136%
0.315%
0.000%
0.369%
0.000%
0.000%
0.219%
1.313%
0.000%
0.180%
0.055%
0.000%
0.000%
0.762%
SW
1.370%
0.000%
0.000%
4.167%
2.099%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.724%
0.000%
0.000%
0.000%
1.695%
0.000%
0.000%
0.000%
0.000%
0.000%
1.667%
0.000%
0.000%
0.000%
0.000%
0.000%
2.564%
9.524%
0.000%
0.800%
3.125%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.612%
Population Served by Systems
with At Least One Detection
> 0.05 mg/L
Total
9,939
6,300
0
110,553
1,406,938
10,890
85
0
30
16,284
0
968
2,144
4,168
2,229
0
37,002
18,180
31,493
16,913
331
0
5,975
450
2,528
40
11,059
0
524,745
442,206
1,170
7,555
152,225
425
0
274
0
0
19,684
12,445
0
260
360
0
0
2,855,848
GW
9,718
6,300
0
71,128
504,206
10,890
85
0
30
16,284
0
968
1,619
4,168
2,229
0
11,010
18,180
31,493
16,913
331
0
903
450
2,528
40
11,059
0
524,512
51,336
1,170
3,008
26,794
425
0
274
0
0
19,684
3,895
0
260
360
0
0
1,352,250
SW
221
0
0
39,425
902,732
0
0
0
0
0
0
0
525
0
0
0
25,992
0
0
0
0
0
5,072
0
0
0
0
0
233
390,870
0
4,547
125,431
0
0
0
0
0
0
8,550
0
0
0
0
0
1,503,598
Percent of Population Served
with At Least One Detection
> 0.05 mg/L
Total
1.645%
0.134%
0.000%
1.794%
3.881%
0.218%
0.003%
0.000%
0.000%
0.225%
0.000%
0.038%
0.196%
0.046%
0.045%
0.000%
0.434%
0.362%
4.325%
0.242%
0.008%
0.000%
0.792%
0.006%
0.449%
0.003%
1.172%
0.000%
31.470%
45.425%
0.010%
0.074%
19.744%
0.014%
0.000%
0.009%
0.000%
0.000%
0.079%
0.489%
0.000%
0.053%
0.009%
0.000%
0.000%
1.240%
GW
4.205%
0.431%
0.000%
2.547%
3.757%
2.053%
0.022%
0.000%
0.000%
1.206%
0.000%
0.068%
0.193%
0.144%
0.085%
0.000%
0.639%
1.778%
10.766%
0.852%
0.011%
0.000%
0.249%
0.026%
0.980%
0.006%
2.807%
0.000%
37.441%
18.102%
0.095%
0.096%
9.630%
0.074%
0.000%
0.048%
0.000%
0.000%
0.212%
0.231%
0.000%
0.115%
0.015%
0.000%
0.000%
1.577%
SW
0.059%
0.000%
0.000%
1.170%
3.954%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.205%
0.000%
0.000%
0.000%
0.382%
0.000%
0.000%
0.000%
0.000%
0.000%
1.292%
0.000%
0.000%
0.000%
0.000%
0.000%
0.087%
56.657%
0.000%
0.064%
25.454%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.997%
0.000%
0.000%
0.000%
0.000%
0.000%
1.039%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A4d. Arsenic —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.025 mg/L
Total
46
1
1
148
221
4
6
1
1
2
0
21
41
42
30
0
18
13
48
202
48
1
16
5
14
5
86
3
36
64
8
25
6
17
1
2
0
3
45
21
1
4
8
1
5
1,271
GW
43
1
1
140
200
4
6
1
1
2
0
21
39
41
30
0
15
13
47
201
48
1
14
5
14
5
85
3
35
61
8
24
5
17
1
2
0
1
44
19
1
4
8
1
4
1,216
SW
3
0
0
8
21
0
0
0
0
0
0
0
2
1
0
0
3
0
1
1
0
0
2
0
0
0
1
0
1
3
0
1
1
0
0
0
0
2
1
2
0
0
0
0
1
55
Percent of Systems
with At Least One Detection
> 0.025 mg/L
Total
7.492%
0.284%
0.221%
14.002%
5.725%
0.482%
0.513%
0.356%
0.075%
0.126%
0.000%
2.013%
4.399%
3.347%
1.847%
0.000%
2.624%
1.260%
5.933%
6.390%
3.013%
0.070%
1.928%
0.219%
6.452%
0.678%
7.026%
0.218%
4.972%
18.935%
0.507%
1.296%
2.885%
1.538%
0.699%
0.336%
0.000%
0.855%
0.916%
4.142%
0.063%
0.666%
0.438%
0.215%
1.645%
2.569%
GW
9.188%
0.358%
0.262%
13.875%
5.995%
0.657%
0.531%
0.360%
0.076%
0.135%
0.000%
2.079%
4.462%
3.553%
1.905%
0.000%
2.641%
1.349%
6.225%
6.469%
3.069%
0.074%
1.818%
0.233%
7.368%
0.688%
7.185%
0.224%
5.109%
19.243%
0.597%
1.330%
2.841%
1.786%
0.746%
0.369%
0.000%
0.617%
0.963%
4.158%
0.071%
0.718%
0.443%
0.329%
1.569%
2.679%
SW
2.055%
0.000%
0.000%
16.667%
4.008%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.448%
0.990%
0.000%
0.000%
2.542%
0.000%
1.852%
1.852%
0.000%
0.000%
3.333%
0.000%
0.000%
0.000%
2.439%
0.000%
2.564%
14.286%
0.000%
0.800%
3.125%
0.000%
0.000%
0.000%
0.000%
1.058%
0.292%
4.000%
0.000%
0.000%
0.000%
0.000%
2.041%
1.346%
Population Served by Systems
with At Least One Detection
> 0.025 mg/L
Total
33,908
6,300
37
1,426,798
7,128,594
11,167
1,086
1,591
30
16,315
0
8,412
45,912
145,069
8,213
0
51,970
25,707
37,833
172,188
20,201
1,212
9,277
7,419
13,219
3,866
61,367
237
606,085
487,590
3,493
13,184
198,878
7,902
95
274
0
28,672
176,847
288,889
140
6,128
998
2,500
500
11,060,103
GW
24,487
6,300
37
613,024
1,688,881
11,167
1,086
1,591
30
16,315
0
8,412
45,247
46,046
8,213
0
22,238
25,707
36,770
162,913
20,201
1,212
4,005
7,419
13,219
3,866
43,367
237
605,852
96,420
3,493
8,637
73,447
7,902
95
274
0
226
78,702
204,299
140
6,128
998
2,500
350
3,901,453
SW
9,421
0
0
813,774
5,439,713
0
0
0
0
0
0
0
665
99,023
0
0
29,732
0
1,063
9,275
0
0
5,272
0
0
0
18,000
0
233
391,170
0
4,547
125,431
0
0
0
0
28,446
98,145
84,590
0
0
0
0
150
7,158,650
Percent of Population Served
with At Least One Detection
> 0.025 mg/L
Total
5.612%
0.134%
0.002%
23.150%
19.664%
0.224%
0.040%
0.234%
0.000%
0.225%
0.000%
0.331%
4.200%
1.596%
0.165%
0.000%
0.609%
0.512%
5.196%
2.466%
0.474%
0.040%
1.229%
0.106%
2.348%
0.266%
6.503%
0.003%
36.348%
50.087%
0.031%
0.129%
25.795%
0.269%
0.010%
0.009%
0.000%
0.504%
0.705%
11.357%
0.003%
1.243%
0.025%
0.174%
0.112%
4.801%
GW
10.596%
0.431%
0.004%
21.951%
12.584%
2.106%
0.284%
0.399%
0.000%
1.208%
0.000%
0.588%
5.407%
1.594%
0.313%
0.000%
1.291%
2.514%
12.570%
8.203%
0.670%
0.072%
1.107%
0.434%
5.127%
0.573%
11.009%
0.009%
43.248%
34.000%
0.285%
0.276%
26.398%
1.372%
0.055%
0.048%
0.000%
0.015%
0.848%
12.117%
0.022%
2.700%
0.042%
0.985%
0.271%
4.550%
SW
2.525%
0.000%
0.000%
24.143%
23.827%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.259%
1.597%
0.000%
0.000%
0.437%
0.000%
0.244%
0.186%
0.000%
0.000%
1.343%
0.000%
0.000%
0.000%
3.274%
0.000%
0.087%
56.700%
0.000%
0.064%
25.454%
0.000%
0.000%
0.000%
0.000%
0.674%
0.622%
9.863%
0.000%
0.000%
0.000%
0.000%
0.047%
4.949%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A4e. Arsenic —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.01 mg/L
Total
107
4
3
336
586
16
25
4
3
3
0
42
118
72
147
3
34
47
126
570
131
8
38
13
36
74
204
31
89
127
24
159
13
64
1
3
11
5
82
60
12
8
60
6
11
3,516
GW
99
4
3
321
518
11
25
4
3
3
0
42
112
71
145
1
27
47
124
568
131
8
35
13
35
73
202
30
87
123
22
157
11
62
1
3
11
1
81
57
12
8
60
5
8
3,364
SW
8
0
0
15
68
5
0
0
0
0
0
0
6
1
2
2
7
0
2
2
0
0
3
0
1
1
2
1
2
4
2
2
2
2
0
0
0
4
1
3
0
0
0
1
3
152
Percent of Systems
with At Least One Detection
> 0.01 mg/L
Total
17.427%
1.136%
0.662%
31.788%
15.181%
1.928%
2.137%
1.423%
0.225%
0.188%
0.000%
4.027%
12.661%
5.737%
9.052%
1.240%
4.956%
4.554%
15.575%
18.032%
8.223%
0.563%
4.578%
0.569%
16.590%
10.027%
16.667%
2.256%
12.293%
37.574%
1.520%
8.243%
6.250%
5.792%
0.699%
0.504%
5.820%
1.425%
1.669%
11.834%
0.759%
1.331%
3.286%
1.290%
3.618%
7.107%
GW
21.154%
1.434%
0.787%
31.814%
15.528%
1.806%
2.210%
1.439%
0.229%
0.203%
0.000%
4.158%
12.815%
6.153%
9.206%
1.075%
4.754%
4.876%
16.424%
18.281%
8.376%
0.596%
4.545%
0.606%
18.421%
10.041%
17.075%
2.244%
12.701%
38.801%
1.643%
8.703%
6.250%
6.513%
0.746%
0.554%
6.077%
0.617%
1.772%
12.473%
0.849%
1.436%
3.322%
1.645%
3.137%
7.412%
SW
5.479%
0.000%
0.000%
31.250%
12.977%
2.262%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
10.345%
0.990%
4.082%
1.342%
5.932%
0.000%
3.704%
3.704%
0.000%
0.000%
5.000%
0.000%
3.704%
9.091%
4.878%
2.703%
5.128%
19.048%
0.833%
1.600%
6.250%
1.307%
0.000%
0.000%
0.000%
2.116%
0.292%
6.000%
0.000%
0.000%
0.000%
0.621%
6.122%
3.720%
Population Served by Systems
with At Least One Detection
> 0.01 mg/L
Total
285,512
48,842
4,784
4,799,509
13,280,982
31,795
4,339
4,442
880
16,343
0
26,647
399,686
224,068
151,633
56,804
136,331
83,479
73,901
745,619
248,365
11,164
20,653
21,285
33,565
57,170
116,064
753,876
764,452
546,637
43,254
118,852
274,257
73,597
95
766
3,075
75,771
215,265
521,996
19,118
7,204
87,688
3,603
3,753
24,397,121
GW
52,751
48,842
4,784
1,810,409
3,272,066
19,558
4,339
4,442
880
16,343
0
26,647
193,554
125,045
77,736
8,461
47,745
83,479
71,600
438,990
248,365
11,164
8,857
21,285
29,049
56,777
87,064
77,622
691,518
155,217
39,290
112,305
74,258
58,294
95
766
3,075
226
117,120
437,286
19,118
7,204
87,688
3,502
700
8,655,516
SW
232,761
0
0
2,989,100
10,008,916
12,237
0
0
0
0
0
0
206,132
99,023
73,897
48,343
88,586
0
2,301
306,629
0
0
11,796
0
4,516
393
29,000
676,254
72,934
391,420
3,964
6,547
199,999
15,303
0
0
0
75,545
98,145
84,710
0
0
0
101
3,053
15,741,605
Percent of Population Served
with At Least One Detection
> 0.01 mg/L
Total
47.251%
1.039%
0.195%
77.873%
36.636%
0.636%
0.160%
0.653%
0.005%
0.226%
0.000%
1.049%
36.564%
2.466%
3.045%
1.234%
1.598%
1.663%
10.149%
10.678%
5.823%
0.371%
2.737%
0.305%
5.961%
3.939%
12.299%
9.712%
45.846%
56.153%
0.386%
1.163%
35.572%
2.502%
0.010%
0.024%
1.097%
1.333%
0.859%
20.522%
0.398%
1.461%
2.168%
0.251%
0.841%
10.589%
GW
22.827%
3.338%
0.526%
64.828%
24.380%
3.688%
1.135%
1.115%
0.006%
1.210%
0.000%
1.861%
23.132%
4.330%
2.967%
2.254%
2.771%
8.164%
24.476%
22.105%
8.236%
0.660%
2.447%
1.246%
11.266%
8.412%
22.102%
2.847%
49.363%
54.733%
3.205%
3.591%
26.689%
10.124%
0.055%
0.134%
1.494%
0.015%
1.261%
25.936%
3.013%
3.174%
3.727%
1.380%
0.542%
10.095%
SW
62.377%
0.000%
0.000%
88.682%
43.841%
0.274%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
80.407%
1.597%
3.131%
1.144%
1.301%
0.000%
0.528%
6.136%
0.000%
0.000%
3.004%
0.000%
1.480%
0.051%
5.275%
13.429%
27.362%
56.736%
0.040%
0.092%
40.587%
0.647%
0.000%
0.000%
0.000%
1.789%
0.622%
9.877%
0.000%
0.000%
0.000%
0.009%
0.963%
10.882%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A4f. Arsenic —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.005 mg/L
Total
169
7
10
638
1,141
62
48
13
81
23
0
103
317
138
323
33
76
131
279
1,036
270
30
105
81
62
361
314
90
256
212
61
341
30
145
2
5
50
17
642
146
35
33
249
22
41
8,228
GW
158
5
9
613
1,009
49
48
12
80
23
0
102
310
134
319
12
67
130
275
1,033
270
27
93
74
58
356
312
87
251
204
58
336
28
141
2
5
50
2
610
136
35
33
247
20
36
7,859
SW
11
2
1
25
132
13
0
1
1
0
0
1
7
4
4
21
9
1
4
3
0
3
12
7
4
5
2
3
5
8
3
5
2
4
0
0
0
15
32
10
0
0
2
2
5
369
Percent of Systems
with At Least One Detection
> 0.005 mg/L
Total
27.524%
1.989%
2.208%
60.360%
29.560%
7.470%
4.103%
4.626%
6.067%
1.444%
0.000%
9.875%
34.013%
10.996%
19.889%
13.636%
11.079%
12.694%
34.487%
32.774%
16.949%
2.113%
12.651%
3.548%
28.571%
48.916%
25.654%
6.550%
35.359%
62.722%
3.863%
17.678%
14.423%
13.122%
1.399%
0.840%
26.455%
4.843%
13.070%
28.797%
2.212%
5.491%
13.636%
4.731%
13.487%
16.631%
GW
33.761%
1.792%
2.362%
60.753%
30.246%
8.046%
4.244%
4.317%
6.112%
1.555%
0.000%
10.099%
35.469%
11.612%
20.254%
12.903%
11.796%
13.485%
36.424%
33.248%
17.263%
2.010%
12.078%
3.451%
30.526%
48.968%
26.374%
6.507%
36.642%
64.353%
4.332%
18.625%
15.909%
14.811%
1.493%
0.923%
27.624%
1.235%
13.348%
29.759%
2.475%
5.925%
13.677%
6.579%
14.118%
17.316%
SW
7.534%
2.740%
1.389%
52.083%
25.191%
5.882%
0.000%
33.333%
3.846%
0.000%
0.000%
3.030%
12.069%
3.960%
8.163%
14.094%
7.627%
1.471%
7.407%
5.556%
0.000%
3.896%
20.000%
5.036%
14.815%
45.455%
4.878%
8.108%
12.821%
38.095%
1.250%
4.000%
6.250%
2.614%
0.000%
0.000%
0.000%
7.937%
9.357%
20.000%
0.000%
0.000%
10.000%
1.242%
10.204%
9.031%
Population Served by Systems
with At Least One Detection
> 0.005 mg/L
Total
355,254
118,793
37,187
5,458,866
21,011,998
277,495
15,831
112,259
688,227
29,565
0
201,475
662,662
646,695
430,812
540,085
306,743
164,072
132,232
1,063,035
422,532
80,640
356,324
90,474
130,909
1,136,491
134,658
1,469,207
1,135,771
883,230
71,120
263,944
299,712
219,995
295
986
36,580
661,668
5,906,433
1,173,073
47,931
22,931
602,490
11,472
42,455
47,454,607
GW
121,657
51,242
14,573
2,213,313
6,737,394
67,649
15,831
6,989
655,228
29,565
0
74,145
453,378
396,227
356,083
103,537
164,678
150,920
127,193
753,044
422,532
67,154
118,951
63,757
67,526
388,140
105,658
261,936
1,059,785
230,098
51,513
244,539
99,713
179,332
295
986
36,580
1,908
1,397,937
603,257
47,931
22,931
464,972
9,570
24,430
18,464,077
SW
233,597
67,551
22,614
3,245,553
14,274,604
209,846
0
105,270
32,999
0
0
127,330
209,284
250,468
74,729
436,548
142,065
13,152
5,039
309,991
0
13,486
237,373
26,717
63,383
748,351
29,000
1,207,271
75,986
653,132
19,607
19,405
199,999
40,663
0
0
0
659,760
4,508,496
569,816
0
0
137,518
1,902
18,025
28,990,530
Percent of Population Served
with At Least One Detection
> 0.005 mg/L
Total
58.793%
2.527%
1.516%
88.572%
57.962%
5.555%
0.583%
16.513%
3.961%
0.408%
0.000%
7.932%
60.622%
7.116%
8.650%
11.735%
3.596%
3.268%
18.160%
15.223%
9.907%
2.682%
47.220%
1.297%
23.249%
78.302%
14.269%
18.927%
68.115%
90.729%
0.635%
2.582%
38.873%
7.480%
0.032%
0.032%
13.050%
11.638%
23.561%
46.118%
0.998%
4.650%
14.896%
0.800%
9.515%
20.597%
GW
52.645%
3.502%
1.602%
79.256%
50.200%
12.756%
4.141%
1.754%
4.331%
2.190%
0.000%
5.179%
54.183%
13.720%
13.591%
27.576%
9.558%
14.759%
43.481%
37.918%
14.012%
3.968%
32.865%
3.732%
26.189%
57.507%
26.822%
9.607%
75.651%
81.138%
4.202%
7.820%
35.838%
31.144%
0.170%
0.172%
17.778%
0.130%
15.057%
35.780%
7.554%
10.103%
19.761%
3.770%
18.913%
21.536%
SW
62.601%
2.086%
1.466%
96.290%
62.525%
4.700%
0.000%
37.409%
1.469%
0.000%
0.000%
11.485%
81.636%
4.040%
3.166%
10.328%
2.087%
0.329%
1.157%
6.204%
0.000%
1.026%
60.451%
0.507%
20.766%
96.377%
5.275%
23.973%
28.507%
94.672%
0.196%
0.274%
40.587%
1.719%
0.000%
0.000%
0.000%
15.624%
28.562%
66.440%
0.000%
0.000%
8.129%
0.161%
5.686%
20.041%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A5. Asbestos — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration or
Threshold of
Interest
>7MFL
>3.5MFL
>7MFL
>3.5MFL
>7MFL
>3.5MFL
Total # Systems
Reporting
6,873
6,873
1,405
1,405
8,278
8,278
# Systems Exceeding
Threshold of Interest
11
19
3
6
14
25
% Systems Exceeding
Threshold of Interest
0.160%
0.276%
0.214%
0.427%
0.169%
0.302%
Total Pop. Served by
Systems Reporting
22,423,343
22,423,343
62,738,591
62,738,591
85,161,934
85,161,934
Total Pop. Served by
Systems Exceeding
Threshold of Interest
57,015
82,927
196,962
322,738
253,977
405,665
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.254%
0.370%
0.314%
0.514%
0.298%
0.476%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A5a. Asbestos — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
24
2
2,264
6,158
7
625
2
75
10
51
128
126
152
461
201
2
27
296
2,031
17
8
2,929
383
13
266
274
629
121
23
130
39
251
201
2
37
144
15
57
18,181
GW
18
1
1,927
3,858
5
557
0
72
10
44
106
71
131
203
111
2
19
248
1,841
8
8
2,765
290
11
202
183
492
56
13
97
36
110
135
0
24
139
15
29
13,837
SW
6
1
337
2,300
2
68
2
3
0
7
22
55
21
258
90
0
8
48
190
9
0
164
93
2
64
91
137
65
10
33
3
141
66
2
13
5
0
28
4,344
Percent of Samples
with Detections
Total
4.167%
0.000%
0.442%
2.046%
28.571%
2.560%
0.000%
2.667%
0.000%
3.922%
6.250%
11.905%
1.974%
11.931%
2.985%
0.000%
3.704%
1.351%
2.708%
0.000%
0.000%
0.000%
13.316%
69.231%
0.752%
4.380%
2.067%
1.653%
0.000%
5.385%
0.000%
5.578%
0.995%
0.000%
2.703%
2.778%
86.667%
1.754%
2.404%
GW
0.000%
0.000%
0.415%
1.918%
40.000%
1.975%
0.000%
2.778%
0.000%
4.545%
5.660%
4.225%
2.290%
24.138%
3.604%
0.000%
5.263%
1.613%
2.173%
0.000%
0.000%
0.000%
12.759%
81.818%
0.990%
2.732%
2.236%
0.000%
0.000%
6.186%
0.000%
6.364%
1.481%
0.000%
4.167%
2.878%
86.667%
0.000%
2.211%
SW
16.667%
0.000%
0.593%
2.261%
0.000%
7.353%
0.000%
0.000%
0.000%
0.000%
9.091%
21.818%
0.000%
2.326%
2.222%
0.000%
0.000%
0.000%
7.895%
0.000%
0.000%
0.000%
15.054%
0.000%
0.000%
7.692%
1.460%
3.077%
0.000%
3.030%
0.000%
4.965%
0.000%
0.000%
0.000%
0.000%
0.000%
3.571%
3.016%
Minimum Detect
Concentration (MFL)
Total
1.33
0.2
0.02
0.4
0.1
0.16
0.2
0.16
0.008
0.09
0.1
0.07
1.2
0.48
0.17
0.09
0.17
0.2
0.14
0.17
0.2
0.17
0.01
0.36
0.35
0.03
0.18
0.18
0.008
GW
0.2
0.02
0.4
0.1
0.16
0.2
0.16
0.03
0.09
0.1
0.07
1.2
0.48
0.17
0.09
0.17
0.2
0.14
0.17
0.17
0.07
0.36
0.35
0.03
0.18
0.02
SW
1.33
0.4
0.02
0.12
0.19
0.008
0.1
0.2
0.17
0.09
0.15
0.19
0.2
0.17
0.01
0.18
0.008
Median Detect
Concentration (MFL)
Total
1.33
0.45
0.375
1.27
0.17
0.175
0.695
0.64
0.08
0.46
0.61
0.185
1.2
4.095
0.17
0.09
0.17
0.2
0.2
0.2
0.27
0.19
0.48
0.445
0.35
0.155
0.53
0.18
0.2
GW
0.36
0.55
1.27
0.17
0.175
0.695
1.83
0.03
0.46
0.92
0.12
1.2
4.095
0.17
0.19
0.17
0.2
0.18
0.34
0.97
0.36
0.445
0.35
0.155
0.53
0.26
SW
1.33
0.45
0.2
0.19
0.235
0.1
0.19
5.1
0.18
0.09
0.2
0.195
0.27
0.17
6.4
0.18
0.2
90th Percentile Detect
Concentration (MFL)
Total
1.33
4.27
3.38
2.14
1.15
0.19
1.19
2.76
0.25
7
5
10
1.2
29
0.52
1.26
0.19
0.2
0.34
9.3
0.34
5.63
317.2
0.53
0.35
1.54
8.98
0.18
3.48
GW
5.5
4
2.14
0.72
0.19
1.19
2.76
0.07
7
5.2
0.57
1.2
29
0.36
3.8
0.19
0.2
10
9.3
5.63
3.2
0.53
0.35
1.54
8.98
4
SW
1.33
0.5
1.07
6.3
0.28
0.25
0.51
10
0.71
0.45
0.2
0.2
0.34
0.17
2494
0.18
1.07
Maximum Detect
Concentration (MFL)
Total
1.33
5.5
79.08
2.14
6.3
0.19
1.19
2.76
1.72
7
143.9
10
1.2
29
29.3
7.68
0.19
0.2
10
87.23
0.34
5.63
2494
0.53
0.35
1.54
13.47
0.18
2494
GW
5.5
79.08
2.14
1.15
0.19
1.19
2.76
0.07
7
143.9
0.57
1.2
29
29.3
7.68
0.19
0.2
10
87.23
5.63
3.2
0.53
0.35
1.54
13.47
143.9
SW
1.33
0.5
14
6.3
0.28
1.72
0.51
10
0.87
0.72
0.2
0.2
0.34
0.17
2494
0.18
2494
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A5b. Asbestos — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
16
2
924
1,388
4
490
1
61
6
51
95
96
130
221
163
2
24
228
1,315
14
8
1,216
208
11
121
235
513
101
21
121
30
164
107
2
29
116
1
43
8,278
GW
11
1
879
1,017
3
455
0
58
6
44
77
64
123
83
94
2
17
191
1,190
7
8
1,175
176
10
104
158
432
48
13
88
27
64
90
0
22
112
1
23
6,873
SW
5
1
45
371
1
35
1
3
0
7
18
32
7
138
69
0
7
37
125
7
0
41
32
1
17
77
81
53
8
33
3
100
17
2
7
4
0
20
1,405
Total Population Served by Systems
Reporting
Total
33,462
4,000
5,215,395
27,789,969
2,544
2,432,389
140,000
2,259,724
44,855
728,677
340,678
1,113,336
792,867
4,430,954
6,326,752
494
109,931
472,774
6,215,391
32,350
4,909
942,517
5,450,404
37,104
869,850
832,261
7,706,350
1,507,822
865,000
2,047,596
33,315
4,022,250
1,450,860
204
140,927
551,981
9,144
202,898
85,161,934
GW
18,076
3,600
1,908,412
8,171,870
524
234,260
0
1,762,276
44,855
123,837
316,471
298,293
166,009
364,222
892,833
494
48,228
232,847
1,134,270
20,805
4,909
392,718
577,367
36,554
189,964
287,744
1,785,109
131,186
125,562
511,340
27,673
1,266,367
891,172
0
43,253
378,995
9,144
22,104
22,423,343
SW
15,386
400
3,306,983
19,618,099
2,020
2,198,129
140,000
497,448
0
604,840
24,207
815,043
626,858
4,066,732
5,433,919
0
61,703
239,927
5,081,121
11,545
0
549,799
4,873,037
550
679,886
544,517
5,921,241
1,376,636
739,438
1,536,256
5,642
2,755,883
559,688
204
97,674
172,986
0
180,794
62,738,591
Percent of Systems
with At Least One Detection
Total
6.250%
0.000%
0.866%
4.323%
50.000%
2.653%
0.000%
3.279%
0.000%
3.922%
8.421%
8.333%
2.308%
4.072%
3.067%
0.000%
4.167%
0.877%
3.346%
0.000%
0.000%
0.000%
19.712%
81.818%
0.826%
3.830%
2.339%
1.980%
0.000%
5.785%
0.000%
6.098%
1.869%
0.000%
3.448%
3.448%
100.000%
2.326%
3.237%
GW
0.000%
0.000%
0.796%
3.147%
66.667%
1.978%
0.000%
3.448%
0.000%
4.545%
7.792%
4.688%
2.439%
3.614%
3.191%
0.000%
5.882%
1.047%
2.689%
0.000%
0.000%
0.000%
17.614%
90.000%
0.962%
3.165%
2.315%
0.000%
0.000%
6.818%
0.000%
9.375%
2.222%
0.000%
4.545%
3.571%
100.000%
0.000%
2.663%
SW
20.000%
0.000%
2.222%
7.547%
0.000%
11.429%
0.000%
0.000%
0.000%
0.000%
11.111%
15.625%
0.000%
4.348%
2.899%
0.000%
0.000%
0.000%
9.600%
0.000%
0.000%
0.000%
31.250%
0.000%
0.000%
5.195%
2.469%
3.774%
0.000%
3.030%
0.000%
4.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.000%
6.050%
Percent of Population Served
with At Least One Detection
Total
6.873%
0.000%
30.358%
23.732%
15.566%
7.669%
0.000%
0.156%
0.000%
0.863%
28.788%
17.835%
0.050%
2.702%
0.984%
0.000%
1.569%
15.673%
24.529%
0.000%
0.000%
0.000%
24.894%
96.658%
0.667%
4.002%
22.364%
3.018%
0.000%
1.395%
0.000%
5.045%
1.103%
0.000%
0.106%
0.603%
100.000%
1.018%
16.345%
GW
0.000%
0.000%
2.604%
4.507%
75.573%
1.375%
0.000%
0.200%
0.000%
5.077%
28.562%
11.723%
0.241%
7.738%
2.310%
0.000%
3.577%
31.822%
4.655%
0.000%
0.000%
0.000%
31.343%
98.112%
3.053%
0.969%
3.728%
0.000%
0.000%
5.424%
0.000%
3.348%
1.795%
0.000%
0.347%
0.879%
100.000%
0.000%
5.018%
SW
14.949%
0.000%
46.374%
31.740%
0.000%
8.340%
0.000%
0.000%
0.000%
0.000%
31.739%
20.072%
0.000%
2.251%
0.766%
0.000%
0.000%
0.000%
28.966%
0.000%
0.000%
0.000%
24.130%
0.000%
0.000%
5.605%
27.983%
3.305%
0.000%
0.054%
0.000%
5.824%
0.000%
0.000%
0.000%
0.000%
0.000%
1.142%
20.393%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A5c. Asbestos — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>7MFL
Total
0
0
0
4
0
0
0
0
0
0
0
0
0
1
1
0
0
1
2
0
0
0
1
0
0
1
1
0
0
0
0
1
0
0
0
0
1
0
14
GW
0
0
0
3
0
0
0
0
0
0
0
0
0
1
0
0
0
1
2
0
0
0
1
0
0
1
1
0
0
0
0
0
0
0
0
0
1
0
11
sw
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
3
Percent of Systems
with At Least One Detection
>7MFL
Total
0.000%
0.000%
0.000%
0.288%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.452%
0.613%
0.000%
0.000%
0.439%
0.152%
0.000%
0.000%
0.000%
0.481%
0.000%
0.000%
0.426%
0.195%
0.000%
0.000%
0.000%
0.000%
0.610%
0.000%
0.000%
0.000%
0.000%
100.000%
0.000%
0.169%
GW
0.000%
0.000%
0.000%
0.295%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.205%
0.000%
0.000%
0.000%
0.524%
0.168%
0.000%
0.000%
0.000%
0.568%
0.000%
0.000%
0.633%
0.231%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
100.000%
0.000%
0.160%
sw
0.000%
0.000%
0.000%
0.270%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.449%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.214%
Population Served by Systems
with At Least One Detection
>7MFL
Total
0
0
0
164,234
0
0
0
0
0
0
0
0
0
15,222
33,600
0
0
1,796
28,050
0
0
0
585
0
0
450
120
0
0
0
0
776
0
0
0
0
9,144
0
253,977
GW
0
0
0
1,648
0
0
0
0
0
0
0
0
0
15,222
0
0
0
1,796
28,050
0
0
0
585
0
0
450
120
0
0
0
0
0
0
0
0
0
9,144
0
57,015
SW
0
0
0
162,586
0
0
0
0
0
0
0
0
0
0
33,600
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
776
0
0
0
0
0
0
196,962
Percent of Population Served
with At Least One Detection
>7MFL
Total
0.000%
0.000%
0.000%
0.591%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.344%
0.531%
0.000%
0.000%
0.380%
0.451%
0.000%
0.000%
0.000%
0.011%
0.000%
0.000%
0.054%
0.002%
0.000%
0.000%
0.000%
0.000%
0.019%
0.000%
0.000%
0.000%
0.000%
100.000%
0.000%
0.298%
GW
0.000%
0.000%
0.000%
0.020%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.179%
0.000%
0.000%
0.000%
0.771%
2.473%
0.000%
0.000%
0.000%
0.101%
0.000%
0.000%
0.156%
0.007%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
100.000%
0.000%
0.254%
sw
0.000%
0.000%
0.000%
0.829%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.618%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.028%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.314%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A5d. Asbestos — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>3.5MFL
Total
0
0
1
6
0
1
0
0
0
0
0
0
1
1
1
0
0
1
2
0
0
0
4
0
0
1
1
0
0
2
0
2
0
0
0
0
1
0
25
GW
0
0
1
4
0
0
0
0
0
0
0
0
1
1
0
0
0
1
2
0
0
0
4
0
0
1
1
0
0
2
0
0
0
0
0
0
1
0
19
SW
0
0
0
2
0
1
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
6
Percent of Systems
with At Least One Detection
>3.5MFL
Total
0.000%
0.000%
0.108%
0.432%
0.000%
0.204%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.769%
0.452%
0.613%
0.000%
0.000%
0.439%
0.152%
0.000%
0.000%
0.000%
1.923%
0.000%
0.000%
0.426%
0.195%
0.000%
0.000%
1.653%
0.000%
1.220%
0.000%
0.000%
0.000%
0.000%
100.000%
0.000%
0.302%
GW
0.000%
0.000%
0.114%
0.393%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.813%
1.205%
0.000%
0.000%
0.000%
0.524%
0.168%
0.000%
0.000%
0.000%
2.273%
0.000%
0.000%
0.633%
0.231%
0.000%
0.000%
2.273%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
100.000%
0.000%
0.276%
SW
0.000%
0.000%
0.000%
0.539%
0.000%
2.857%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.449%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.427%
Population Served by Systems
with At Least One Detection
>3.5MFL
Total
0
0
8,900
164,584
0
51,128
0
0
0
0
0
0
200
15,222
33,600
0
0
1,796
28,050
0
0
0
4,897
0
0
450
120
0
0
12,150
0
75,424
0
0
0
0
9,144
0
405,665
GW
0
0
8,900
1,998
0
0
0
0
0
0
0
0
200
15,222
0
0
0
1,796
28,050
0
0
0
4,897
0
0
450
120
0
0
12,150
0
0
0
0
0
0
9,144
0
82,927
SW
0
0
0
162,586
0
51,128
0
0
0
0
0
0
0
0
33,600
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
75,424
0
0
0
0
0
0
322,738
Percent of Population Served
with At Least One Detection
>3.5MFL
Total
0.000%
0.000%
0.171%
0.592%
0.000%
2.102%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.025%
0.344%
0.531%
0.000%
0.000%
0.380%
0.451%
0.000%
0.000%
0.000%
0.090%
0.000%
0.000%
0.054%
0.002%
0.000%
0.000%
0.593%
0.000%
1.875%
0.000%
0.000%
0.000%
0.000%
100.000%
0.000%
0.476%
GW
0.000%
0.000%
0.466%
0.024%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.120%
4.179%
0.000%
0.000%
0.000%
0.771%
2.473%
0.000%
0.000%
0.000%
0.848%
0.000%
0.000%
0.156%
0.007%
0.000%
0.000%
2.376%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
100.000%
0.000%
0.370%
SW
0.000%
0.000%
0.000%
0.829%
0.000%
2.326%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.618%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.737%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.514%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A6. Atrazine— Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold of
Interest
> 3 ug/L
> 1.5 ug/L
> 3 ug/L
> 1.5 ug/L
> 3 ug/L
> 1.5 ug/L
Total # Systems
Reporting
33,752
33,752
3,463
3,463
37,215
37,215
# Systems Exceeding
Threshold of Interest
7
24
91
160
98
184
% Systems Exceeding
Threshold of Interest
0.021%
0.071%
2.628%
4.620%
0.263%
0.494%
Total Pop Served by
Systems Reporting
74,386,872
74,386,872
125,985,718
125,985,718
200,372,590
200,372,590
Total Pop. Served by
Systems Exceeding
Threshold of Interest
93,709
220,526
3,014,621
7,977,093
3,108,330
8,197,619
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.126%
0.296%
2.393%
6.332%
1.551%
4.091%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A6a. Atrazine — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
52
557
1,657
6,990
23,055
2,499
1,326
1,266
2,415
1,477
2,101
2,194
2,869
5,265
2,672
1,949
3,071
2,931
456
6,924
4,760
9,519
3,018
13,265
409
4,480
4,193
195
4,524
1,595
2,937
7,571
2,062
926
2,906
976
1,021
11,280
7,103
503
1,419
3,353
651
1,298
161,690
GW
17
399
1,411
5,427
14,685
1,824
1,015
1,221
2,341
1,396
2,004
1,821
2,569
3,999
2,331
436
2,251
1,809
391
6,424
4,619
5,075
2,709
12,111
343
4,131
3,874
176
4,261
1,163
2,198
4,182
1,577
633
2,516
854
94
5,352
5,915
178
1,206
3,260
339
978
121,515
SW
35
158
246
1,563
8,370
675
311
45
74
81
97
373
300
1,266
341
1,513
820
1,122
65
500
141
4,444
309
1,154
66
349
319
19
263
432
739
3,389
485
293
390
122
927
5,928
1,188
325
213
93
312
320
40,175
Percent of Samples
with Detections
Total
0.000%
2.154%
0.241%
0.100%
0.030%
1.080%
0.226%
1.422%
0.745%
0.068%
9.281%
17.320%
0.627%
5.337%
4.566%
10.159%
0.847%
5.937%
0.000%
0.534%
1.534%
9.024%
0.033%
0.528%
0.244%
26.473%
0.191%
1.026%
1.260%
0.063%
0.238%
19.852%
0.097%
3.348%
0.000%
0.102%
4.897%
11.082%
0.014%
0.398%
0.493%
5.488%
1.690%
0.000%
4.227%
GW
0.000%
0.251%
0.283%
0.129%
0.041%
1.425%
0.296%
1.474%
0.598%
0.000%
9.431%
6.370%
0.506%
0.125%
0.129%
0.000%
0.666%
3.040%
0.000%
0.016%
1.364%
0.296%
0.037%
0.140%
0.000%
25.466%
0.207%
0.568%
1.338%
0.086%
0.000%
0.526%
0.127%
3.791%
0.000%
0.000%
1.064%
3.120%
0.017%
0.000%
0.166%
5.552%
1.475%
0.000%
1.725%
SW
0.000%
6.962%
0.000%
0.000%
0.012%
0.148%
0.000%
0.000%
5.405%
1.235%
6.186%
70.777%
1.667%
21.801%
34.897%
13.087%
1.341%
10.606%
0.000%
7.200%
7.092%
18.992%
0.000%
4.593%
1.515%
38.395%
0.000%
5.263%
0.000%
0.000%
0.947%
43.700%
0.000%
2.389%
0.000%
0.820%
5.286%
18.269%
0.000%
0.615%
2.347%
3.226%
1.923%
0.000%
11.796%
Minimum Detect
Concentration (u.g/L)
Total
0.09
0.06
0.08
0.16
0.1
0.2
0.1
0.01
6
0.01
0.1
0.1
0.3
0.01
0.05
0.06
0.00037
0.2
0.1
0.5
1.41
0.1
0.1
0.08
0.2
0.13
0.23
0.09
0.04
0.1
0.2
0.1
1.61
0.05
0.1
0.1
0.9
0.06
0.003
0.07
0.00037
GW
0.1
0.06
0.08
0.16
0.1
0.2
0.1
0.01
0.01
0.1
0.1
0.35
0.2
0.1
0.01
0.2
0.1
0.55
1.41
0.1
0.08
0.2
0.13
0.23
0.09
0.1
0.2
0.1
2.6
0.1
0.1
0.06
0.003
0.07
0.003
SW
0.09
1.4
7.1
0.12
6
0.11
0.1
0.19
0.3
0.01
0.05
0.06
0.00037
0.2
0.3
0.5
0.1
0.1
0.08
0.13
0.04
0.1
0.12
1.61
0.05
0.1
0.9
0.06
0.1
0.07
0.00037
Median Detect
Concentration (u.g/L)
Total
0.19
0.075
0.1
1
0.28
0.22
0.1
0.01
6
0.13
0.255
0.24
0.64
0.6
0.48
0.1
0.265
0.6
0.4
0.93
1.41
0.215
0.1
0.15
0.345
0.13
0.78
0.09
0.11
0.6
0.26
0.12
1.61
0.18
0.36
0.1
1.05
0.2
0.3
0.1
0.4
GW
0.1
0.075
0.1
0.91
0.27
0.22
0.1
0.01
0.13
0.175
0.21
0.69
0.3
0.2
0.3
0.2
0.5
2.55
1.41
0.34
0.15
0.345
0.13
0.78
0.09
0.305
0.26
0.11
2.6
0.3
0.1
0.13
0.3
0.33
0.19
SW
0.19
1.4
7.1
0.18
6
0.14
0.4
0.54
0.63
0.6
0.48
0.1
0.23
0.6
0.4
0.92
0.2
0.1
0.21
0.13
0.11
0.6
0.14
1.61
0.17
0.37
1.05
0.21
0.1
0.1
0.55
90th Percentile Detect
Concentration (u.g/L)
Total
0.29
0.08
0.3
2.6
1
0.22
0.3
0.21
6
0.66
0.97
0.54
1.8
2.1
2.48
0.3
0.66
4
1.5
2.21
1.41
2.3
0.1
0.44
0.6
0.13
1.55
0.09
0.16
2
0.32
0.23
1.61
0.69
0.92
0.1
1.2
0.44
0.8
0.5
1.43
GW
0.1
0.08
0.3
2.6
0.69
0.22
0.3
0.08
0.67
0.36
0.3
1
0.76
0.3
0.66
0.2
1.5
5.02
1.41
3.9
0.34
0.6
0.13
1.55
0.09
1.4
0.32
0.13
2.6
0.91
0.1
0.2
0.8
0.56
0.69
SW
0.29
1.4
7.1
0.24
6
0.2
1
0.55
1.8
2.5
2.48
0.2
0.7
4
0.55
2.14
0.97
0.1
1.03
0.13
0.16
2
0.48
1.61
0.65
0.92
1.2
0.44
0.2
0.5
1.7
Maximum Detect
Concentration (u.g/L)
Total
1.1
0.08
0.3
2.6
10
0.22
0.4
0.24
6
1.25
10.1
0.55
27
11
21
0.3
3.3
7
1.8
15
1.41
5.2
0.1
9.07
0.6
0.13
3.71
0.09
0.16
27
0.32
0.48
1.61
3.9
9.01
0.1
1.2
0.44
1.8
0.56
27
GW
0.1
0.08
0.3
2.6
10
0.22
0.4
0.13
1.25
1.9
0.35
1
0.76
0.3
2.3
0.2
1.8
10.9
1.41
3.9
6
0.6
0.13
3.71
0.09
2.2
0.32
0.23
2.6
2.2
0.1
0.2
1.8
0.56
10.9
SW
1.1
1.4
7.1
0.24
6
0.2
10.1
0.55
27
11
21
0.24
3.3
7
0.6
15
5.2
0.1
9.07
0.13
0.16
27
0.48
1.61
3.9
9.01
1.2
0.44
0.2
0.5
27
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A6b. Atrazine — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
12
178
454
934
2,399
801
656
247
1,317
294
112
1,056
916
1,371
1,411
242
644
862
269
2,934
1,287
1,474
813
2,365
209
762
1,237
131
695
295
1,345
1,939
1,085
105
770
261
210
2,002
426
182
450
1,416
343
304
37,215
GW
7
130
382
886
2,025
582
619
244
1,295
280
100
1,023
860
1,267
1,366
93
527
794
241
2,873
1,258
1,397
753
2,228
182
751
1,196
119
659
274
1,114
1,814
935
97
711
240
39
1,665
389
71
417
1,396
197
256
33,752
SW
5
48
72
48
374
219
37
3
22
14
12
33
56
104
45
149
117
68
28
61
29
77
60
137
27
11
41
12
36
21
231
125
150
8
59
21
171
337
37
111
33
20
146
48
3,463
Total Population Served by Systems
Reporting
Total
245,571
2,788,859
2,453,348
6,077,627
34,964,717
4,988,574
2,588,757
647,226
16,794,353
974,583
1,305,882
2,543,237
1,090,602
9,186,700
4,875,411
4,602,489
8,485,298
4,906,096
510,420
7,227,105
3,934,332
3,282,439
753,259
6,885,177
559,198
1,455,834
945,754
2,002,039
1,661,712
961,667
4,925,284
10,227,103
2,938,854
902,560
3,427,270
622,272
5,082,009
21,523,196
2,500,671
2,391,215
435,710
3,885,086
1,366,917
446,177
200,372,590
GW
13,636
625,336
910,322
2,707,036
13,050,587
521,665
261,490
365,826
14,552,348
282,561
1,251,254
1,434,611
834,803
2,986,303
2,552,675
375,460
1,682,916
907,989
134,500
2,047,249
2,684,691
1,701,108
360,590
1,733,551
253,973
679,354
395,955
354,819
1,398,814
271,776
982,007
3,132,166
574,104
163,122
800,487
263,101
967,746
5,759,696
1,667,485
30,317
184,546
2,193,342
206,326
129,229
74,386,872
SW
231,935
2,163,523
1,543,026
3,370,591
21,914,130
4,466,909
2,327,267
281,400
2,242,005
692,022
54,628
1,108,626
255,799
6,200,397
2,322,736
4,227,029
6,802,382
3,998,107
375,920
5,179,856
1,249,641
1,581,331
392,669
5,151,626
305,225
776,480
549,799
1,647,220
262,898
689,891
3,943,277
7,094,937
2,364,750
739,438
2,626,783
359,171
4,114,263
15,763,500
833,186
2,360,898
251,164
1,691,744
1,160,591
316,948
125,985,718
Percent of Systems
with At Least One Detection
Total
0.000%
5.056%
0.441%
0.642%
0.208%
0.999%
0.305%
2.024%
0.759%
0.340%
16.071%
6.818%
0.983%
4.887%
1.843%
17.355%
1.242%
3.364%
0.000%
0.239%
1.709%
3.867%
0.123%
1.099%
0.478%
13.911%
0.243%
1.527%
1.007%
0.339%
0.297%
4.693%
0.184%
4.762%
0.000%
0.383%
13.333%
6.743%
0.235%
0.549%
0.667%
3.955%
2.624%
0.000%
2.386%
GW
0.000%
0.769%
0.524%
0.677%
0.198%
1.203%
0.323%
2.049%
0.541%
0.000%
17.000%
4.301%
0.814%
0.395%
0.146%
0.000%
0.759%
1.259%
0.000%
0.035%
1.431%
0.358%
0.133%
0.314%
0.000%
13.316%
0.251%
0.840%
1.062%
0.365%
0.000%
0.772%
0.214%
4.124%
0.000%
0.000%
2.564%
1.982%
0.257%
0.000%
0.480%
3.797%
2.538%
0.000%
1.132%
SW
0.000%
16.667%
0.000%
0.000%
0.267%
0.457%
0.000%
0.000%
13.636%
7.143%
8.333%
84.848%
3.571%
59.615%
53.333%
28.188%
3.419%
27.941%
0.000%
9.836%
13.793%
67.532%
0.000%
13.869%
3.704%
54.545%
0.000%
8.333%
0.000%
0.000%
1.732%
61.600%
0.000%
12.500%
0.000%
4.762%
15.789%
30.267%
0.000%
0.901%
3.030%
15.000%
2.740%
0.000%
14.612%
Percent of Population Served
with At Least One Detection
Total
0.000%
7.855%
0.637%
12.374%
0.353%
0.206%
0.451%
1.601%
20.009%
0.274%
21.818%
44.073%
21.825%
16.769%
33.681%
46.060%
1.714%
79.256%
0.000%
1.855%
15.066%
13.913%
0.011%
11.023%
16.526%
67.864%
0.669%
1.028%
2.312%
0.021%
0.503%
36.844%
0.071%
9.327%
0.000%
2.202%
9.444%
49.956%
4.239%
4.391%
1.394%
4.962%
7.929%
0.000%
17.077%
GW
0.000%
1.019%
1.716%
27.781%
0.761%
1.679%
4.463%
2.832%
20.829%
0.000%
22.732%
13.090%
6.158%
0.609%
2.680%
0.000%
1.810%
1.466%
0.000%
0.001%
0.479%
5.322%
0.023%
0.898%
0.000%
33.993%
1.598%
0.166%
2.746%
0.074%
0.000%
2.892%
0.361%
9.758%
0.000%
0.000%
0.009%
10.360%
6.357%
0.000%
3.242%
4.129%
0.488%
0.000%
7.923%
SW
0.000%
9.831%
0.000%
0.000%
0.110%
0.034%
0.000%
0.000%
14.684%
0.386%
0.879%
84.166%
72.955%
24.553%
67.752%
50.151%
1.691%
96.923%
0.000%
2.587%
46.405%
23.154%
0.000%
14.430%
30.277%
97.498%
0.000%
1.214%
0.000%
0.000%
0.628%
51.832%
0.000%
9.232%
0.000%
3.815%
11.663%
64.424%
0.000%
4.448%
0.036%
6.043%
9.252%
0.000%
22.482%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A6c. Atrazine — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 3 ug/L
Total
0
0
0
0
0
2
0
0
0
1
0
1
0
9
6
8
0
1
0
3
0
25
0
2
0
2
0
0
1
0
0
28
0
0
0
0
1
8
0
0
0
0
0
0
98
GW
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3
0
1
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7
sw
0
0
0
0
0
1
0
0
0
1
0
1
0
9
6
8
0
1
0
3
0
22
0
1
0
1
0
0
0
0
0
28
0
0
0
0
1
8
0
0
0
0
0
0
91
Percent of Systems
with At Least One Detection
> 3 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.250%
0.000%
0.000%
0.000%
0.340%
0.000%
0.095%
0.000%
0.656%
0.425%
3.306%
0.000%
0.116%
0.000%
0.102%
0.000%
1.696%
0.000%
0.085%
0.000%
0.262%
0.000%
0.000%
0.144%
0.000%
0.000%
1.444%
0.000%
0.000%
0.000%
0.000%
0.476%
0.400%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.263%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.172%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.215%
0.000%
0.045%
0.000%
0.133%
0.000%
0.000%
0.152%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.021%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.457%
0.000%
0.000%
0.000%
7.143%
0.000%
3.030%
0.000%
8.654%
13.333%
5.369%
0.000%
1.471%
0.000%
4.918%
0.000%
28.571%
0.000%
0.730%
0.000%
9.091%
0.000%
0.000%
0.000%
0.000%
0.000%
22.400%
0.000%
0.000%
0.000%
0.000%
0.585%
2.374%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.628%
Population Served by Systems
with At Least One Detection
> 3 ug/L
Total
0
0
0
0
0
2,614
0
0
0
2,671
0
4,573
0
113,232
53,737
114,484
0
54,000
0
26,843
0
251,575
0
50,598
0
514,144
0
0
92
0
0
1,680,358
0
0
0
0
40,994
198,415
0
0
0
0
0
0
3,108,330
GW
0
0
0
0
0
1,114
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
90,373
0
150
0
1,980
0
0
92
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
93,709
SW
0
0
0
0
0
1,500
0
0
0
2,671
0
4,573
0
113,232
53,737
114,484
0
54,000
0
26,843
0
161,202
0
50,448
0
512,164
0
0
0
0
0
1,680,358
0
0
0
0
40,994
198,415
0
0
0
0
0
0
3,014,621
Percent of Population Served
with At Least One Detection
> 3 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.052%
0.000%
0.000%
0.000%
0.274%
0.000%
0.180%
0.000%
1.233%
1.102%
2.487%
0.000%
1.101%
0.000%
0.371%
0.000%
7.664%
0.000%
0.735%
0.000%
35.316%
0.000%
0.000%
0.006%
0.000%
0.000%
16.430%
0.000%
0.000%
0.000%
0.000%
0.807%
0.922%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.551%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.214%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.313%
0.000%
0.009%
0.000%
0.291%
0.000%
0.000%
0.007%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.126%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.034%
0.000%
0.000%
0.000%
0.386%
0.000%
0.412%
0.000%
1.826%
2.314%
2.708%
0.000%
1.351%
0.000%
0.518%
0.000%
10.194%
0.000%
0.979%
0.000%
65.960%
0.000%
0.000%
0.000%
0.000%
0.000%
23.684%
0.000%
0.000%
0.000%
0.000%
0.996%
1.259%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.393%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A6d. Atrazine — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 1.5 ug/L
Total
0
0
0
0
1
2
0
0
0
1
0
6
0
18
10
19
0
4
0
3
1
39
0
2
0
4
0
0
3
0
0
44
0
0
0
1
3
22
0
0
0
1
0
0
184
GW
0
0
0
0
1
1
0
0
0
0
0
2
0
0
0
0
0
2
0
0
1
4
0
1
0
2
0
0
3
0
0
1
0
0
0
0
1
4
0
0
0
1
0
0
24
SW
0
0
0
0
0
1
0
0
0
1
0
4
0
18
10
19
0
2
0
3
0
35
0
1
0
2
0
0
0
0
0
43
0
0
0
1
2
18
0
0
0
0
0
0
160
Percent of Systems
with At Least One Detection
> 1.5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.042%
0.250%
0.000%
0.000%
0.000%
0.340%
0.000%
0.568%
0.000%
1.313%
0.709%
7.851%
0.000%
0.464%
0.000%
0.102%
0.078%
2.646%
0.000%
0.085%
0.000%
0.525%
0.000%
0.000%
0.432%
0.000%
0.000%
2.269%
0.000%
0.000%
0.000%
0.383%
1.429%
1.099%
0.000%
0.000%
0.000%
0.071%
0.000%
0.000%
0.494%
GW
0.000%
0.000%
0.000%
0.000%
0.049%
0.172%
0.000%
0.000%
0.000%
0.000%
0.000%
0.196%
0.000%
0.000%
0.000%
0.000%
0.000%
0.252%
0.000%
0.000%
0.079%
0.286%
0.000%
0.045%
0.000%
0.266%
0.000%
0.000%
0.455%
0.000%
0.000%
0.055%
0.000%
0.000%
0.000%
0.000%
2.564%
0.240%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.071%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.457%
0.000%
0.000%
0.000%
7.143%
0.000%
12.121%
0.000%
17.308%
22.222%
12.752%
0.000%
2.941%
0.000%
4.918%
0.000%
45.455%
0.000%
0.730%
0.000%
18.182%
0.000%
0.000%
0.000%
0.000%
0.000%
34.400%
0.000%
0.000%
0.000%
4.762%
1.170%
5.341%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.620%
Population Served by Systems
with At Least One Detection
> 1.5 ug/L
Total
0
0
0
0
98,730
2,614
0
0
0
2,671
0
76,656
0
331,755
1,148,282
408,419
0
67,320
0
26,843
40
317,810
0
50,598
0
522,701
0
0
292
0
0
2,479,796
0
0
0
13,703
48,881
2,597,519
0
0
0
2,989
0
0
8,197,619
GW
0
0
0
0
98,730
1,114
0
0
0
0
0
9,848
0
0
0
0
0
120
0
0
40
90,478
0
150
0
2,198
0
0
292
0
0
325
0
0
0
0
85
14,157
0
0
0
2,989
0
0
220,526
SW
0
0
0
0
0
1,500
0
0
0
2,671
0
66,808
0
331,755
1,148,282
408,419
0
67,200
0
26,843
0
227,332
0
50,448
0
520,503
0
0
0
0
0
2,479,471
0
0
0
13,703
48,796
2,583,362
0
0
0
0
0
0
7,977,093
Percent of Population Served
with At Least One Detection
> 1.5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.282%
0.052%
0.000%
0.000%
0.000%
0.274%
0.000%
3.014%
0.000%
3.611%
23.553%
8.874%
0.000%
1.372%
0.000%
0.371%
0.001%
9.682%
0.000%
0.735%
0.000%
35.904%
0.000%
0.000%
0.018%
0.000%
0.000%
24.247%
0.000%
0.000%
0.000%
2.202%
0.962%
12.068%
0.000%
0.000%
0.000%
0.077%
0.000%
0.000%
4.091%
GW
0.000%
0.000%
0.000%
0.000%
0.757%
0.214%
0.000%
0.000%
0.000%
0.000%
0.000%
0.686%
0.000%
0.000%
0.000%
0.000%
0.000%
0.013%
0.000%
0.000%
0.001%
5.319%
0.000%
0.009%
0.000%
0.324%
0.000%
0.000%
0.021%
0.000%
0.000%
0.010%
0.000%
0.000%
0.000%
0.000%
0.009%
0.246%
0.000%
0.000%
0.000%
0.136%
0.000%
0.000%
0.296%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.034%
0.000%
0.000%
0.000%
0.386%
0.000%
6.026%
0.000%
5.351%
49.437%
9.662%
0.000%
1.681%
0.000%
0.518%
0.000%
14.376%
0.000%
0.979%
0.000%
67.034%
0.000%
0.000%
0.000%
0.000%
0.000%
34.947%
0.000%
0.000%
0.000%
3.815%
1.186%
16.388%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.332%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A7. Barium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 2 mg/L
> 1 mg/L
> 2 mg/L
> 1 mg/L
> 2 mg/L
> 1 mg/L
Total # Systems
Reporting
45,118
45,118
4,007
4,007
49,125
49,125
# Systems Exceeding
Threshold of Interest
61
225
5
15
66
240
% Systems Exceeding
Threshold of Interest
0.135%
0.499%
0.125%
0.374%
0.134%
0.489%
Total Pop. Served by
Systems Reporting
85,388,860
85,388,860
144,386,847
144,386,847
229,775,707
229,775,707
Total Pop. Served by
Systems Exceeding
Threshold of Interest
189,533
609,877
21,575
211,283
211,108
821,160
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.222%
0.714%
0.015%
0.146%
0.092%
0.357%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A7a. Barium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
871
2,673
2,187
6,315
35,330
4,391
2,589
693
2,139
2,884
1,166
1,490
2,661
3,597
4,811
1,788
2,998
5,108
2,716
6,144
3,337
5,684
2,757
9,225
346
1,884
3,187
6,571
3,514
1,994
3,711
4,129
421
1,317
891
3,445
388
1,537
14,920
7,023
2,820
2,048
7,152
1,135
1,131
183,118
GW
619
1,813
1,532
4,935
20,859
2,334
1,866
645
2,070
2,490
1,104
1,227
2,388
3,194
4,330
552
2,003
3,988
2,318
5,970
3,288
4,907
2,471
7,786
303
1,798
3,003
5,854
3,188
1,454
2,817
3,494
346
956
661
2,981
359
481
12,336
5,480
2,210
1,727
6,981
444
876
142,438
SW
252
860
655
1,380
14,471
2,057
723
48
69
394
62
263
273
403
481
1,236
995
1,120
398
174
49
111
286
1,439
43
86
184
717
326
540
894
635
75
361
230
464
29
1,056
2,584
1,543
610
321
171
691
255
40,680
Percent of Samples
with Detections
Total
76.464%
33.071%
92.318%
82.470%
32.205%
87.543%
63.963%
65.801%
66.854%
17.268%
5.232%
73.758%
46.749%
92.383%
80.815%
85.011%
55.137%
37.529%
88.071%
86.182%
67.276%
96.569%
52.992%
25.192%
97.399%
97.081%
53.404%
65.119%
62.379%
88.365%
64.188%
58.465%
97.150%
41.686%
31.538%
8.505%
88.918%
95.511%
98.237%
89.577%
8.759%
47.900%
91.415%
34.626%
28.294%
60.955%
GW
80.452%
26.806%
93.538%
80.831%
36.900%
87.961%
62.540%
64.341%
66.618%
19.679%
5.525%
76.039%
48.660%
91.703%
80.554%
90.761%
50.474%
30.767%
86.281%
85.829%
68.157%
96.026%
55.807%
21.346%
97.030%
96.997%
52.714%
63.153%
63.582%
87.414%
65.708%
57.928%
97.399%
46.757%
33.132%
9.124%
88.301%
92.723%
98.038%
87.792%
8.959%
52.056%
91.620%
52.928%
31.050%
62.814%
SW
66.667%
46.279%
89.466%
88.333%
25.437%
87.069%
67.635%
85.417%
73.913%
2.030%
0.000%
63.118%
30.037%
97.767%
83.160%
82.443%
64.523%
61.607%
98.492%
98.276%
8.163%
100.000%
28.671%
46.004%
100.000%
98.837%
64.674%
81.172%
50.613%
90.926%
59.396%
61.417%
96.000%
28.255%
26.957%
4.526%
96.552%
96.780%
99.187%
95.917%
8.033%
25.545%
83.041%
22.865%
18.824%
54.444%
Minimum Detect
Concentration (mg/L)
Total
0.00044
0.00022
0.0011
0.001
8.8E-05
0.00081
0.0007
0.0002
0.0002
0.01
0.01
0.01
0.0005
0.0006
9.9E-05
0.0004
0.001
0.001
0.0005
0.001
0.02
0.00106
0.002
0.0008
0.001
0.01
0.0008
0.001
8.6E-05
0.001
0.00028
0.00011
0.00018
0.0002
0.0019
0.02
0.0009
0.00053
0.0012
0.007
0.003
0.001
0.0001
0.00019
0.0047
8.6E-05
GW
0.001
0.00064
0.0016
0.001
8.8E-05
0.00081
0.0019
0.0002
0.0002
0.01
0.01
0.01
0.0005
0.0006
9.9E-05
0.003
0.001
0.001
0.0005
0.001
0.02
0.00106
0.002
0.0008
0.001
0.01
0.0008
0.001
8.6E-05
0.001
0.00028
0.00011
0.00018
0.0002
0.0019
0.04
0.0009
0.00053
0.0012
0.007
0.003
0.001
0.0001
0.00019
0.01
8.6E-05
SW
0.00044
0.00022
0.0011
0.0011
0.0001
0.0009
0.0007
0.02
0.0012
0.05
0.01
0.008
0.002
0.0012
0.0004
0.001
0.001
0.0007
0.004
0.02
0.00576
0.005
0.0046
0.00482
0.01
0.003
0.002
0.0062
0.0028
0.001
0.0023
0.01
0.0003
0.02
0.02
0.01
0.0022
0.0023
0.01
0.007
0.002
0.0019
0.01
0.0047
0.0001
Median Detect
Concentration (mg/L)
Total
0.02
0.02
0.02
0.05
0.11
0.04
0.03
0.05
0.01
0.07
0.01
0.1
0.07
0.06
0.07
0.02
0.01
0.03
0.0052
0.06
0.07
0.06
0.11
0.02
0.03
0.12
0.01
0.05
0.06
0.05
0.06
0.09
0.12
0.0089
0.03
0.07
0.06
0.02
0.07
0.06
0.11
0.03
0.03
0.1
0.13
0.05
GW
0.02
0.03
0.03
0.05
0.1
0.05
0.03
0.06
0.01
0.07
0.01
0.12
0.07
0.07
0.08
0.03
0.02
0.07
0.006
0.07
0.07
0.06
0.12
0.03
0.03
0.13
0.01
0.05
0.06
0.05
0.07
0.11
0.13
0.009
0.03
0.07
0.06
0.02
0.08
0.06
0.2
0.03
0.03
0.21
0.13
0.06
SW
0.01
0.02
0.01
0.05
0.11
0.03
0.02
0.03
0.01
0.05
0.07
0.06
0.02
0.02
0.02
0.01
0.02
0.0034
0.02
0.1
0.05
0.07
0.01
0.01
0.11
0.01
0.04
0.03
0.04
0.02
0.02
0.1
0.00745
0.03
0.06
0.05
0.02
0.06
0.05
0.02
0.02
0.01
0.04
0.1
0.04
90th Percentile Detect
Concentration (mg/L)
Total
0.12
0.1
0.14
0.17
0.21
0.15
0.21
0.23
0.03
0.2
0.02
0.34
0.14
0.4
0.32
0.07
0.09
0.21
0.04
0.21
0.21
0.19
0.3
0.12
0.12
0.25
0.07
0.25
0.2
0.11
0.3
0.32
0.38
0.04
0.08
0.14
0.16
0.06
0.25
0.18
0.41
0.1
0.12
0.67
0.3
0.21
GW
0.12
0.13
0.17
0.19
0.21
0.17
0.23
0.24
0.03
0.2
0.02
0.37
0.15
0.5
0.34
0.23
0.12
0.25
0.05
0.21
0.21
0.21
0.3
0.14
0.14
0.25
0.08
0.27
0.2
0.11
0.33
0.36
0.39
0.04
0.08
0.14
0.17
0.18
0.26
0.17
0.44
0.1
0.12
1.04
0.3
0.23
SW
0.09
0.08
0.03
0.11
0.22
0.1
0.2
0.05
0.03
0.1
0.11
0.1
0.06
0.1
0.05
0.06
0.05
0.01
0.03
0.18
0.11
0.2
0.02
0.05
0.21
0.01
0.16
0.2
0.12
0.15
0.09
0.29
0.04
0.07
0.07
0.11
0.04
0.16
0.18
0.26
0.03
0.02
0.21
0.26
0.15
Maximum Detect
Concentration (mg/L)
Total
1.12
0.92
2.39
1.92
8.6
0.83
2.16
0.9
2
0.44
0.11
1.67
0.9
7.44
5.81
2.63
2
1.18
6.2
3
2.3
1.85
0.9
1.3
0.56
0.91
0.78
2.9
1.27
0.85
19
4.07
1.5
11
0.34
0.52
0.93
1.6
4.01
1.1
0.98
0.52
16
9.98
0.8
19
GW
1.12
0.7
2.39
1.92
8.6
0.83
2.16
0.9
2
0.44
0.11
1.67
0.9
7.44
5.81
2.63
2
1.18
6.2
3
2.3
1.41
0.9
1.3
0.56
0.91
0.78
2.9
1.27
0.85
19
4.07
1.5
0.6
0.34
0.52
0.93
1.6
4.01
1.1
0.98
0.52
16
9.98
0.8
19
SW
0.67
0.92
0.28
1
1.2
0.68
0.51
0.19
0.11
0.1
0.85
0.15
1
0.89
0.61
2
1.01
0.08
0.1
0.18
1.85
0.5
0.87
0.05
0.24
0.03
0.8
0.84
0.19
19
0.83
0.98
11
0.13
0.08
0.15
0.43
1.27
0.58
0.58
0.2
0.19
0.79
0.32
19
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A7b. Barium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
493
353
453
1,049
3,826
838
1,169
279
1,331
1,600
107
967
896
1,490
1,623
242
675
1,038
808
2,995
1,459
1,421
846
2,284
217
731
1,223
1,374
725
330
1,677
1,917
203
731
143
823
235
350
4,930
507
1,586
598
1,823
456
304
49,125
GW
394
280
381
1,001
3,302
617
1,130
276
1,305
1,485
95
934
849
1,387
1,574
93
557
970
754
2,943
1,432
1,344
787
2,145
190
720
1,182
1,337
686
309
1,434
1,792
175
610
134
758
224
161
4,587
457
1,418
556
1,803
295
255
45,118
SW
99
73
72
48
524
221
39
3
26
115
12
33
47
103
49
149
118
68
54
52
27
77
59
139
27
11
41
37
39
21
243
125
28
121
9
65
11
189
343
50
168
42
20
161
49
4,007
Total Population Served by Systems
Reporting
Total
523,158
4,707,360
2,452,800
6,161,306
36,246,208
4,998,506
2,716,117
679,635
17,209,555
7,244,380
1,303,767
2,500,395
1,049,622
9,168,134
4,980,057
4,602,489
8,525,485
5,022,488
727,802
6,681,641
3,959,159
3,006,743
757,540
6,973,592
563,069
1,449,290
943,800
7,762,423
1,668,123
971,701
11,262,435
10,218,949
753,964
2,770,064
913,584
3,468,333
328,972
5,683,572
25,070,435
2,543,652
4,805,368
490,389
4,044,416
1,419,045
446,184
229,775,707
GW
211,375
1,469,326
909,774
2,790,715
13,416,333
533,275
382,195
398,235
14,963,513
1,352,049
1,249,139
1,391,769
806,747
2,968,062
2,619,602
375,460
1,718,061
1,024,381
292,198
1,889,310
2,725,622
1,692,282
365,141
1,708,426
257,844
672,810
394,001
2,726,477
1,401,575
281,810
1,278,087
3,124,012
276,712
486,818
173,606
809,806
237,011
1,460,816
9,285,450
1,686,017
636,302
226,621
2,352,672
238,255
129,168
85,388,860
SW
311,783
3,238,034
1,543,026
3,370,591
22,829,875
4,465,231
2,333,922
281,400
2,246,042
5,892,331
54,628
1,108,626
242,875
6,200,072
2,360,455
4,227,029
6,807,424
3,998,107
435,604
4,792,331
1,233,537
1,314,461
392,399
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
9,984,348
7,094,937
477,252
2,283,246
739,978
2,658,527
91,961
4,222,756
15,784,985
857,635
4,169,066
263,768
1,691,744
1,180,790
317,016
144,386,847
Percent of Systems
with At Least One Detection
Total
83.570%
57.507%
98.896%
91.802%
49.582%
96.539%
68.178%
73.118%
68.670%
20.938%
11.215%
74.767%
63.616%
95.503%
87.246%
96.281%
65.185%
52.505%
90.594%
92.287%
72.447%
98.944%
64.066%
44.308%
97.235%
97.674%
68.765%
75.255%
75.034%
96.970%
75.552%
68.388%
96.059%
46.238%
37.762%
13.973%
94.894%
97.429%
98.803%
92.308%
10.530%
66.388%
95.721%
52.632%
41.776%
72.020%
GW
86.802%
50.714%
98.688%
91.608%
49.273%
95.462%
67.345%
72.826%
68.199%
22.290%
12.632%
74.518%
64.311%
95.242%
86.849%
95.699%
62.118%
50.515%
89.920%
92.219%
73.673%
98.884%
65.438%
41.538%
96.842%
97.639%
68.443%
74.720%
75.364%
96.764%
74.616%
67.243%
96.571%
48.361%
37.313%
14.644%
95.089%
95.652%
98.736%
92.560%
10.437%
66.367%
95.729%
56.949%
42.745%
71.978%
SW
70.707%
83.562%
100.000%
95.833%
51.527%
99.548%
92.308%
100.000%
92.308%
3.478%
0.000%
81.818%
51.064%
99.029%
100.000%
96.644%
79.661%
80.882%
100.000%
96.154%
7.407%
100.000%
45.763%
87.050%
100.000%
100.000%
78.049%
94.595%
69.231%
100.000%
81.070%
84.800%
92.857%
35.537%
44.444%
6.154%
90.909%
98.942%
99.708%
90.000%
11.310%
66.667%
95.000%
44.720%
36.735%
72.498%
Percent of Population Served
with At Least One Detection
Total
90.002%
79.110%
99.937%
97.116%
79.433%
99.722%
95.072%
94.791%
82.772%
6.856%
61.180%
65.532%
87.792%
99.504%
98.838%
98.807%
78.633%
95.702%
98.426%
99.031%
62.589%
99.877%
55.034%
80.190%
99.805%
99.431%
88.122%
93.090%
85.981%
99.828%
32.586%
64.356%
99.143%
45.684%
37.139%
7.161%
95.733%
99.201%
99.940%
98.908%
38.808%
65.269%
97.240%
51.933%
58.615%
79.473%
GW
88.961%
61.065%
99.830%
94.126%
79.837%
97.464%
75.700%
91.111%
83.927%
28.945%
63.855%
76.332%
85.799%
98.491%
97.792%
98.330%
37.850%
79.610%
96.079%
97.554%
90.853%
99.781%
65.431%
41.563%
99.575%
98.775%
78.255%
83.502%
89.584%
99.406%
63.247%
72.733%
98.703%
41.751%
61.623%
19.151%
97.489%
99.335%
99.839%
99.095%
9.608%
74.956%
99.371%
43.275%
50.362%
82.897%
SW
90.708%
87.298%
100.000%
99.591%
79.196%
99.992%
98.245%
100.000%
75.073%
1.788%
0.000%
51.973%
94.414%
99.989%
100.000%
98.850%
88.926%
99.825%
100.000%
99.613%
0.136%
100.000%
45.359%
92.723%
100.000%
100.000%
95.194%
98.281%
67.037%
100.000%
28.661%
60.668%
99.397%
46.522%
31.395%
3.509%
91.206%
99.155%
99.999%
98.540%
43.265%
56.946%
94.277%
53.680%
61.978%
77.449%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A7c. Barium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2 mg/L
Total
0
0
1
0
4
0
1
0
0
0
0
0
0
11
2
2
0
0
1
5
1
0
0
0
0
0
0
2
0
0
22
1
0
1
0
0
0
0
2
0
0
0
8
2
0
66
GW
0
0
1
0
4
0
1
0
0
0
0
0
0
11
2
2
0
0
1
5
1
0
0
0
0
0
0
2
0
0
18
1
0
0
0
0
0
0
2
0
0
0
8
2
0
61
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4
0
0
1
0
0
0
0
0
0
0
0
0
0
0
5
Percent of Systems
with At Least One Detection
> 2 mg/L
Total
0.000%
0.000%
0.221%
0.000%
0.105%
0.000%
0.086%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.738%
0.123%
0.826%
0.000%
0.000%
0.124%
0.167%
0.069%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.146%
0.000%
0.000%
1.312%
0.052%
0.000%
0.137%
0.000%
0.000%
0.000%
0.000%
0.041%
0.000%
0.000%
0.000%
0.439%
0.439%
0.000%
0.134%
GW
0.000%
0.000%
0.262%
0.000%
0.121%
0.000%
0.088%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.793%
0.127%
2.151%
0.000%
0.000%
0.133%
0.170%
0.070%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.150%
0.000%
0.000%
1.255%
0.056%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.044%
0.000%
0.000%
0.000%
0.444%
0.678%
0.000%
0.135%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.646%
0.000%
0.000%
0.826%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.125%
Population Served by Systems
with At Least One Detection
>2 mg/L
Total
0
0
275
0
76,100
0
34
0
0
0
0
0
0
92,301
1,107
510
0
0
53
2,934
1,066
0
0
0
0
0
0
223
0
0
12,354
110
0
15,880
0
0
0
0
1,010
0
0
0
6,251
900
0
211,108
GW
0
0
275
0
76,100
0
34
0
0
0
0
0
0
92,301
1,107
510
0
0
53
2,934
1,066
0
0
0
0
0
0
223
0
0
6,659
110
0
0
0
0
0
0
1,010
0
0
0
6,251
900
0
189,533
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5,695
0
0
15,880
0
0
0
0
0
0
0
0
0
0
0
21,575
Percent of Population Served
with At Least One Detection
> 2 mg/L
Total
0.000%
0.000%
0.011%
0.000%
0.210%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.007%
0.022%
0.011%
0.000%
0.000%
0.007%
0.044%
0.027%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.110%
0.001%
0.000%
0.573%
0.000%
0.000%
0.000%
0.000%
0.004%
0.000%
0.000%
0.000%
0.155%
0.063%
0.000%
0.092%
GW
0.000%
0.000%
0.030%
0.000%
0.567%
0.000%
0.009%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.110%
0.042%
0.136%
0.000%
0.000%
0.018%
0.155%
0.039%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.008%
0.000%
0.000%
0.521%
0.004%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.011%
0.000%
0.000%
0.000%
0.266%
0.378%
0.000%
0.222%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.057%
0.000%
0.000%
0.696%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.015%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A7d. Barium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>1 mg/L
Total
1
0
1
10
15
0
17
0
3
0
0
6
0
41
8
5
4
3
2
10
2
3
0
2
0
0
0
13
1
0
36
11
2
1
0
0
0
2
8
2
0
0
15
16
0
240
GW
1
0
1
7
14
0
17
0
3
0
0
6
0
40
8
5
3
2
2
10
2
2
0
2
0
0
0
13
1
0
31
11
2
0
0
0
0
2
7
2
0
0
15
16
0
225
SW
0
0
0
3
1
0
0
0
0
0
0
0
0
1
0
0
1
1
0
0
0
1
0
0
0
0
0
0
0
0
5
0
0
1
0
0
0
0
1
0
0
0
0
0
0
15
Percent of Systems
with At Least One Detection
>1 mg/L
Total
0.203%
0.000%
0.221%
0.953%
0.392%
0.000%
1.454%
0.000%
0.225%
0.000%
0.000%
0.620%
0.000%
2.752%
0.493%
2.066%
0.593%
0.289%
0.248%
0.334%
0.137%
0.211%
0.000%
0.088%
0.000%
0.000%
0.000%
0.946%
0.138%
0.000%
2.147%
0.574%
0.985%
0.137%
0.000%
0.000%
0.000%
0.571%
0.162%
0.394%
0.000%
0.000%
0.823%
3.509%
0.000%
0.489%
GW
0.254%
0.000%
0.262%
0.699%
0.424%
0.000%
1.504%
0.000%
0.230%
0.000%
0.000%
0.642%
0.000%
2.884%
0.508%
5.376%
0.539%
0.206%
0.265%
0.340%
0.140%
0.149%
0.000%
0.093%
0.000%
0.000%
0.000%
0.972%
0.146%
0.000%
2.162%
0.614%
1.143%
0.000%
0.000%
0.000%
0.000%
1.242%
0.153%
0.438%
0.000%
0.000%
0.832%
5.424%
0.000%
0.499%
SW
0.000%
0.000%
0.000%
6.250%
0.191%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.971%
0.000%
0.000%
0.847%
1.471%
0.000%
0.000%
0.000%
1.299%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.058%
0.000%
0.000%
0.826%
0.000%
0.000%
0.000%
0.000%
0.292%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.374%
Population Served by Systems
with At Least One Detection
> 1 mg/L
Total
302
0
275
23,235
112,655
0
1,547
0
41,411
0
0
3,379
0
334,996
34,846
3,232
56,825
5,190
1,921
3,285
4,782
2,395
0
90
0
0
0
28,200
60
0
44,304
5,639
67
15,880
0
0
0
165
63,910
15,870
0
0
10,022
6,677
0
821,160
GW
302
0
275
19,983
112,224
0
1,547
0
41,411
0
0
3,379
0
233,018
34,846
3,232
40,825
90
1,921
3,285
4,782
653
0
90
0
0
0
28,200
60
0
38,459
5,639
67
0
0
0
0
165
2,855
15,870
0
0
10,022
6,677
0
609,877
SW
0
0
0
3,252
431
0
0
0
0
0
0
0
0
101,978
0
0
16,000
5,100
0
0
0
1,742
0
0
0
0
0
0
0
0
5,845
0
0
15,880
0
0
0
0
61,055
0
0
0
0
0
0
211,283
Percent of Population Served
with At Least One Detection
>1 mg/L
Total
0.058%
0.000%
0.011%
0.377%
0.311%
0.000%
0.057%
0.000%
0.241%
0.000%
0.000%
0.135%
0.000%
3.654%
0.700%
0.070%
0.667%
0.103%
0.264%
0.049%
0.121%
0.080%
0.000%
0.001%
0.000%
0.000%
0.000%
0.363%
0.004%
0.000%
0.393%
0.055%
0.009%
0.573%
0.000%
0.000%
0.000%
0.003%
0.255%
0.624%
0.000%
0.000%
0.248%
0.471%
0.000%
0.357%
GW
0.143%
0.000%
0.030%
0.716%
0.836%
0.000%
0.405%
0.000%
0.277%
0.000%
0.000%
0.243%
0.000%
7.851%
1.330%
0.861%
2.376%
0.009%
0.657%
0.174%
0.175%
0.039%
0.000%
0.005%
0.000%
0.000%
0.000%
1.034%
0.004%
0.000%
3.009%
0.181%
0.024%
0.000%
0.000%
0.000%
0.000%
0.011%
0.031%
0.941%
0.000%
0.000%
0.426%
2.802%
0.000%
0.714%
SW
0.000%
0.000%
0.000%
0.096%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.645%
0.000%
0.000%
0.235%
0.128%
0.000%
0.000%
0.000%
0.133%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.059%
0.000%
0.000%
0.696%
0.000%
0.000%
0.000%
0.000%
0.387%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.146%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A8. Benzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold of
1 nterest
> 5 ug/L
> 2.5 ug/L
> 1 ug/L
> 0.5 ug/L
> 5 ug/L
> 2.5 ug/L
> 1 ug/L
> 0.5 ug/L
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
Total # Systems
Reporting
46,177
46,177
46,177
46,177
4,258
4,258
4,258
4,258
50,435
50,435
50,435
50,435
# Systems Exceeding
Threshold of Interest
57
100
206
283
6
10
22
39
63
110
228
322
% Systems Exceeding
Threshold of Interest
0.123%
0.217%
0.446%
0.613%
0.141%
0.235%
0.517%
0.916%
0.125%
0.218%
0.452%
0.638%
Total Pop. Served by
Systems Reporting
86,395,538
86,395,538
86,395,538
86,395,538
140,551,755
140,551,755
140,551,755
140,551,755
226,947,293
226,947,293
226,947,293
226,947,293
Total Pop. Served by
Systems Exceeding
Threshold of Interest
338,086
700,772
1,079,744
1,486,410
148,852
183,093
4,038,337
7,433,993
486,938
883,865
5,118,081
8,920,403
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.391%
0.811%
1.250%
1.720%
0.106%
0.130%
2.873%
5.289%
0.215%
0.389%
2.255%
3.931%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A8a. Benzene — Summary Statistics of Any Detections by State and Source Water Type (Single detections are not MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,385
845
2,394
11,705
86,914
2,896
6,945
1,050
4,178
7,175
1,791
1,859
3,739
7,011
4,622
3,309
16,249
6,773
3,702
10,755
8,604
7,543
4,483
19,062
560
6,843
9,588
20,354
6,573
3,208
7,134
8,846
5,355
2,324
1,958
4,340
889
2,944
34,152
8,994
4,929
4,359
11,306
1,196
1,662
374,503
GW
2,221
617
1,926
9,530
46,232
2,147
6,053
1,020
4,110
6,348
1,688
1,733
3,278
6,450
4,312
1,126
12,259
5,511
3,383
9,745
7,338
6,694
3,949
17,483
425
6,265
9,110
18,569
6,097
2,576
5,455
7,683
3,958
1,682
1,590
3,801
855
1,165
27,047
7,563
4,056
3,965
11,181
500
1,159
289,855
SW
1,164
228
468
2,175
40,682
749
892
30
68
827
103
126
461
561
310
2,183
3,990
1,262
319
1,010
1,266
849
534
1,579
135
578
478
1,785
476
632
1,679
1,163
1,397
642
368
539
34
1,779
7,105
1,431
873
394
125
696
503
84,648
Percent of Samples
with Detections
Total
2.363%
4.024%
0.292%
0.051%
0.351%
0.138%
0.216%
0.667%
0.957%
0.613%
0.000%
0.484%
0.027%
0.328%
0.043%
0.181%
0.295%
1.152%
0.459%
0.158%
1.116%
0.491%
0.112%
0.362%
3.036%
0.205%
0.574%
0.526%
0.974%
0.156%
0.196%
0.102%
0.224%
0.000%
0.715%
0.253%
0.225%
0.510%
0.524%
0.011%
0.487%
0.138%
0.893%
3.094%
0.120%
0.438%
GW
2.792%
4.862%
0.312%
0.031%
0.645%
0.186%
0.248%
0.686%
0.949%
0.551%
0.000%
0.519%
0.031%
0.341%
0.046%
0.000%
0.302%
1.397%
0.355%
0.174%
0.940%
0.553%
0.127%
0.389%
4.000%
0.223%
0.604%
0.560%
1.033%
0.194%
0.202%
0.104%
0.303%
0.000%
0.881%
0.184%
0.234%
1.202%
0.640%
0.013%
0.542%
0.151%
0.885%
6.200%
0.173%
0.523%
SW
1.546%
1.754%
0.214%
0.138%
0.017%
0.000%
0.000%
0.000%
1.471%
1.088%
0.000%
0.000%
0.000%
0.178%
0.000%
0.275%
0.276%
0.079%
1.567%
0.000%
2.133%
0.000%
0.000%
0.063%
0.000%
0.000%
0.000%
0.168%
0.210%
0.000%
0.179%
0.086%
0.000%
0.000%
0.000%
0.742%
0.000%
0.056%
0.084%
0.000%
0.229%
0.000%
1.600%
0.862%
0.000%
0.146%
Minimum Detect
Concentration (u.g/L)
Total
0.15
0.52
0.32
0.5
0.35
0.11
0.52
0.78
0.12
0.55
0.5
0.6
0.52
0.6
0.05
0.4
0.1
0.5
0.5
0.05
0.6
1
0.5
0.51
0.14
0.5
0.12
0.1
0.5
0.5
0.5
0.1
0.5
0.72
0.58
0.53
0.5
0.5
0.5
0.2
0.03
0.1
0.65
0.03
GW
0.21
0.52
0.32
0.53
0.35
0.11
0.52
0.78
0.12
0.55
0.5
0.6
0.52
0.6
0.4
0.3
0.5
0.5
0.05
0.6
1
0.5
0.51
0.14
0.5
0.12
0.1
0.5
0.5
0.5
0.1
0.5
0.72
0.58
0.53
0.5
0.5
0.5
0.2
0.03
0.1
0.65
0.03
SW
0.15
0.61
0.73
0.5
0.6
0.31
0.68
2.4
0.05
0.5
0.1
0.5
0.2
3.88
0.5
0.6
0.5
0.5
3.23
0.74
0.6
1
0.13
0.4
0.05
Median Detect
Concentration (u.g/L)
Total
0.66
1.525
1.02
0.515
2.5
0.12
1.67
1.03
0.455
1.85
1
0.6
2.4
1.95
0.5
0.81
2.95
0.9
1
0.45
1.6
3
0.8
0.9
1.2
1.1
0.7
1.2
0.5
0.72
0.68
1.6
0.6
3.23
1.09
0.77
1.4
0.5
1.05
1.5
0.58
1
3.025
1.1
GW
0.66
1.76
1.325
1.5
2.6
0.12
1.67
1.03
0.46
2.1
1
0.6
2.07
1.95
0.8
3
1.4
1
0.4
1.6
3
0.8
0.9
1.2
1.1
0.795
1.2
0.5
1.1
0.795
1.6
0.6
1.4
1.09
0.785
1.5
0.5
1
1.5
0.6
1.2
3.025
1.2
SW
0.615
0.68
0.73
0.5
1
0.31
1.7
2.4
0.5
1.23
0.1
0.8
0.8
3.88
0.7
0.6
0.5
0.5
5.33
0.74
0.6
11.5
0.185
0.5
0.7
90th Percentile Detect
Concentration (u.g/L)
Total
3.095
6.79
2.96
5.3
25.2
0.5
6.6
1.48
1.1
3.9
3.2
0.6
7.4
3.3
1
1.7
10
12.3
41.8
2.4
4.55
3.9
3.4
4.79
40
4.1
4.98
5
1
4.1
1.5
9.1
1.1
7.43
1.6
1.2
4
0.5
7
12.7
4.8
6.6
5.4
7.8
GW
2.14
6.795
2.96
5.3
25.3
0.5
6.6
1.48
1.1
4.1
3.2
0.6
7.4
3.3
1.4
10
12.3
41.8
2.3
4.55
3.9
2.8
4.79
40
4.1
4.98
5
1
4.1
1.5
9.1
1.1
4.94
1.6
1.2
4
0.5
4.4
12.7
5.55
4.97
5.4
8
SW
4.14
1.09
0.73
0.5
10
0.31
2.1
2.4
1
3.28
0.1
0.9
2.5
3.88
0.7
0.6
0.9
0.5
8.56
0.74
0.69
22
0.24
11.4
3.19
Maximum Detect
Concentration (u.g/L)
Total
16.1
6.9
2.96
5.3
50
0.5
13
1.48
1.8
11
3.2
0.6
8.2
3.3
1
11
59.9
15
49.3
5.9
12.4
3.9
93
9.13
70
13
28
11.95
1
11.9
1.5
11.2
1.3
8.56
1.6
1.5
27
0.5
22
12.7
11.6
11.4
5.4
93
GW
16.1
6.9
2.96
5.3
50
0.5
13
1.48
1.8
11
3.2
0.6
8.2
3.3
3.7
59.9
15
49.3
5.9
12.4
3.9
93
9.13
70
13
28
11.95
1
11.9
1.5
11.2
1.3
4.94
1.6
1.5
27
0.5
18
12.7
11.6
7.3
5.4
93
SW
11
1.09
0.73
0.5
10
0.31
2.1
2.4
1
11
0.1
0.9
2.8
3.88
0.7
0.6
0.9
0.5
8.56
0.74
0.69
22
0.24
11.4
22
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A8b. Benzene —Summary of Stage 1 (Peak) Analyses of Any Detection > MRL (Single detections > MRL are not MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
264
454
1,059
3,656
827
1,207
318
1,511
1,822
106
1,056
935
1,429
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
210
771
1,258
1,398
726
338
1,524
1,944
718
1,097
145
819
245
351
4,951
500
1,599
603
1,784
403
304
50,435
GW
474
202
382
1,011
3,139
606
1,168
315
1,485
1,706
94
1,023
878
1,325
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
183
760
1,217
1,361
687
317
1,288
1,819
506
945
136
757
233
162
4,609
454
1,428
560
1,764
243
256
46,177
SW
146
62
72
48
517
221
39
3
26
116
12
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
171
43
20
160
48
4,258
Total Population Served by Systems
Reporting
Total
606,193
4,228,835
2,453,348
6,166,873
35,828,629
4,998,841
2,723,376
698,987
17,497,814
7,485,298
1,293,745
2,543,141
1,093,666
9,217,431
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,748,495
1,698,755
973,592
4,894,938
10,227,597
3,119,686
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,273,208
491,035
4,039,526
1,416,020
446,177
226,947,293
GW
232,590
1,123,190
910,322
2,796,282
13,516,168
531,207
389,454
417,587
15,251,772
1,592,517
1,239,117
1,434,515
837,604
3,017,034
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,712,549
1,432,207
283,701
1,044,336
3,132,660
660,832
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
630,625
227,067
2,347,782
237,670
129,229
86,395,538
SW
373,603
3,105,645
1,543,026
3,370,591
22,312,461
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,642,583
263,968
1,691,744
1,178,350
316,948
140,551,755
Percent of Systems
with At Least One Detection
Total
3.226%
3.788%
1.322%
0.283%
0.629%
0.484%
0.497%
0.629%
0.927%
0.329%
0.000%
0.758%
0.107%
0.560%
0.136%
2.490%
2.786%
1.139%
1.358%
0.202%
1.960%
0.353%
0.354%
0.634%
2.381%
0.908%
1.590%
2.718%
1.791%
0.592%
0.722%
0.360%
0.975%
0.000%
2.069%
0.855%
0.408%
1.140%
0.727%
0.200%
0.625%
0.663%
1.570%
4.467%
0.658%
0.884%
GW
1.899%
3.465%
1.309%
0.198%
0.605%
0.660%
0.514%
0.635%
0.875%
0.293%
0.000%
0.782%
0.114%
0.528%
0.140%
0.000%
2.000%
1.116%
1.321%
0.206%
1.933%
0.373%
0.381%
0.628%
2.732%
0.921%
1.643%
2.719%
1.747%
0.631%
0.621%
0.330%
1.383%
0.000%
2.206%
0.793%
0.429%
1.852%
0.738%
0.220%
0.560%
0.714%
1.474%
5.350%
0.781%
0.836%
SW
7.534%
4.839%
1.389%
2.083%
0.774%
0.000%
0.000%
0.000%
3.846%
0.862%
0.000%
0.000%
0.000%
0.962%
0.000%
4.027%
6.780%
1.471%
1.887%
0.000%
3.333%
0.000%
0.000%
0.719%
0.000%
0.000%
0.000%
2.703%
2.564%
0.000%
1.271%
0.800%
0.000%
0.000%
0.000%
1.613%
0.000%
0.529%
0.585%
0.000%
1.170%
0.000%
10.000%
3.125%
0.000%
1.409%
Percent of Population Served
with At Least One Detection
Total
9.883%
5.315%
3.133%
4.899%
1.253%
0.021%
0.070%
0.223%
2.783%
0.173%
0.000%
0.328%
3.292%
0.414%
0.054%
8.996%
44.243%
34.538%
19.073%
0.864%
4.649%
0.479%
0.171%
0.765%
1.836%
3.309%
1.045%
4.127%
8.778%
1.927%
0.185%
0.041%
0.286%
0.000%
0.597%
0.414%
0.250%
1.908%
11.742%
0.001%
1.260%
0.333%
8.106%
2.413%
0.162%
5.372%
GW
23.492%
15.334%
0.626%
0.076%
0.880%
0.195%
0.490%
0.374%
1.605%
0.251%
0.000%
0.582%
4.298%
0.900%
0.102%
0.000%
3.901%
2.437%
0.675%
3.128%
6.220%
0.852%
0.354%
1.815%
4.015%
7.057%
2.486%
10.202%
5.336%
6.613%
0.826%
0.052%
1.352%
0.000%
3.137%
0.485%
0.343%
7.024%
1.219%
0.002%
0.460%
0.720%
12.425%
1.243%
0.561%
2.382%
SW
1.410%
1.692%
4.612%
8.901%
1.480%
0.000%
0.000%
0.000%
10.780%
0.152%
0.000%
0.000%
0.000%
0.177%
0.000%
9.795%
54.614%
42.770%
31.440%
0.000%
0.862%
0.000%
0.000%
0.420%
0.000%
0.000%
0.000%
0.854%
27.275%
0.000%
0.011%
0.037%
0.000%
0.000%
0.000%
0.394%
0.000%
0.136%
17.928%
0.000%
1.368%
0.000%
2.113%
2.649%
0.000%
7.210%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A8c. Benzene — Summary of Stage 1 (Peak) Analyses of Any Detections > 5 u.g/L (Single detections > 5 u.g/L are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 5 ug/L
Total
2
2
0
1
4
0
2
0
0
1
0
0
0
3
0
0
1
5
3
1
1
1
0
2
1
2
3
3
3
0
1
0
1
0
0
1
0
0
8
0
3
1
4
2
1
63
GW
1
2
0
1
3
0
2
0
0
1
0
0
0
3
0
0
0
5
3
1
1
1
0
2
1
2
3
3
3
0
1
0
1
0
0
0
0
0
8
0
2
1
4
1
1
57
SW
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
1
0
0
1
0
6
Percent of Systems
with At Least One Detection
> 5 ug/L
Total
0.323%
0.758%
0.000%
0.094%
0.109%
0.000%
0.166%
0.000%
0.000%
0.055%
0.000%
0.000%
0.000%
0.210%
0.000%
0.000%
0.139%
0.474%
0.370%
0.034%
0.063%
0.071%
0.000%
0.084%
0.476%
0.259%
0.238%
0.215%
0.413%
0.000%
0.066%
0.000%
0.139%
0.000%
0.000%
0.122%
0.000%
0.000%
0.162%
0.000%
0.188%
0.166%
0.224%
0.496%
0.329%
0.125%
GW
0.211%
0.990%
0.000%
0.099%
0.096%
0.000%
0.171%
0.000%
0.000%
0.059%
0.000%
0.000%
0.000%
0.226%
0.000%
0.000%
0.000%
0.507%
0.396%
0.034%
0.064%
0.075%
0.000%
0.090%
0.546%
0.263%
0.247%
0.220%
0.437%
0.000%
0.078%
0.000%
0.198%
0.000%
0.000%
0.000%
0.000%
0.000%
0.174%
0.000%
0.140%
0.179%
0.227%
0.412%
0.391%
0.123%
SW
0.685%
0.000%
0.000%
0.000%
0.193%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.847%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.613%
0.000%
0.000%
0.000%
0.000%
0.585%
0.000%
0.000%
0.625%
0.000%
0.141%
Population Served by Systems
with At Least One Detection
> 5 ug/L
Total
5,225
94,149
0
125
118,343
0
65
0
0
2,500
0
0
0
26,169
0
0
10,433
14,155
355
70
2,287
75
0
115
2,614
40,511
1,948
33,122
59,800
0
1,685
0
167
0
0
10,350
0
0
37,062
0
203
116
1,832
22,837
625
486,938
GW
5,000
94,149
0
125
13,011
0
65
0
0
2,500
0
0
0
26,169
0
0
0
14,155
355
70
2,287
75
0
115
2,614
40,511
1,948
33,122
59,800
0
1,685
0
167
0
0
0
0
0
37,062
0
153
116
1,832
375
625
338,086
SW
225
0
0
0
105,332
0
0
0
0
0
0
0
0
0
0
0
10,433
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
10,350
0
0
0
0
50
0
0
22,462
0
148,852
Percent of Population Served
with At Least One Detection
> 5 ug/L
Total
0.862%
2.226%
0.000%
0.002%
0.330%
0.000%
0.002%
0.000%
0.000%
0.033%
0.000%
0.000%
0.000%
0.284%
0.000%
0.000%
0.122%
0.282%
0.049%
0.001%
0.054%
0.002%
0.000%
0.002%
0.465%
2.771%
0.205%
0.427%
3.520%
0.000%
0.034%
0.000%
0.005%
0.000%
0.000%
0.308%
0.000%
0.000%
0.148%
0.000%
0.004%
0.024%
0.045%
1.613%
0.140%
0.215%
GW
2.150%
8.382%
0.000%
0.004%
0.096%
0.000%
0.017%
0.000%
0.000%
0.157%
0.000%
0.000%
0.000%
0.867%
0.000%
0.000%
0.000%
1.381%
0.121%
0.004%
0.076%
0.004%
0.000%
0.007%
1.016%
5.908%
0.488%
1.221%
4.175%
0.000%
0.161%
0.000%
0.025%
0.000%
0.000%
0.000%
0.000%
0.000%
0.399%
0.000%
0.024%
0.051%
0.078%
0.158%
0.484%
0.391%
SW
0.060%
0.000%
0.000%
0.000%
0.472%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.153%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.394%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
1.906%
0.000%
0.106%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A8d. Benzene —Summary of Stage 1 (Peak) Analyses of Any Detections > 2.5 u.g/L (Single detections > 2.5 u.g/L are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2.5 ug/L
Total
5
3
2
1
6
0
3
0
0
3
0
1
0
3
1
0
3
8
3
1
5
2
2
5
1
3
4
4
5
0
3
0
2
0
0
3
0
0
12
0
4
1
7
3
1
110
GW
3
3
2
1
5
0
3
0
0
3
0
1
0
3
1
0
1
8
3
1
4
2
2
4
1
3
4
4
5
0
3
0
2
0
0
2
0
0
12
0
3
1
7
2
1
100
SW
2
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
1
0
0
1
0
10
Percent of Systems
with At Least One Detection
> 2.5 ug/L
Total
0.806%
1.136%
0.441%
0.094%
0.164%
0.000%
0.249%
0.000%
0.000%
0.165%
0.000%
0.095%
0.000%
0.210%
0.068%
0.000%
0.418%
0.759%
0.370%
0.034%
0.316%
0.141%
0.236%
0.211%
0.476%
0.389%
0.318%
0.286%
0.689%
0.000%
0.197%
0.000%
0.279%
0.000%
0.000%
0.366%
0.000%
0.000%
0.242%
0.000%
0.250%
0.166%
0.392%
0.744%
0.329%
0.218%
GW
0.633%
1.485%
0.524%
0.099%
0.159%
0.000%
0.257%
0.000%
0.000%
0.176%
0.000%
0.098%
0.000%
0.226%
0.070%
0.000%
0.167%
0.811%
0.396%
0.034%
0.258%
0.149%
0.254%
0.180%
0.546%
0.395%
0.329%
0.294%
0.728%
0.000%
0.233%
0.000%
0.395%
0.000%
0.000%
0.264%
0.000%
0.000%
0.260%
0.000%
0.210%
0.179%
0.397%
0.823%
0.391%
0.217%
SW
1.370%
0.000%
0.000%
0.000%
0.193%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.695%
0.000%
0.000%
0.000%
3.333%
0.000%
0.000%
0.719%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.613%
0.000%
0.000%
0.000%
0.000%
0.585%
0.000%
0.000%
0.625%
0.000%
0.235%
Population Served by Systems
with At Least One Detection
> 2.5 ug/L
Total
6,826
94,474
113
125
142,643
0
1,707
0
0
2,828
0
834
0
26,169
130
0
11,483
18,470
355
70
22,376
12,575
794
22,539
2,614
40,698
2,418
59,267
61,198
0
5,685
0
410
0
0
13,252
0
0
48,564
0
685
116
260,825
22,997
625
883,865
GW
6,250
94,474
113
125
37,311
0
1,707
0
0
2,828
0
834
0
26,169
130
0
50
18,470
355
70
11,598
12,575
794
427
2,614
40,698
2,418
59,267
61,198
0
5,685
0
410
0
0
2,902
0
0
48,564
0
635
116
260,825
535
625
700,772
SW
576
0
0
0
105,332
0
0
0
0
0
0
0
0
0
0
0
11,433
0
0
0
10,778
0
0
22,112
0
0
0
0
0
0
0
0
0
0
0
10,350
0
0
0
0
50
0
0
22,462
0
183,093
Percent of Population Served
with At Least One Detection
> 2.5 ug/L
Total
1.126%
2.234%
0.005%
0.002%
0.398%
0.000%
0.063%
0.000%
0.000%
0.038%
0.000%
0.033%
0.000%
0.284%
0.003%
0.000%
0.134%
0.368%
0.049%
0.001%
0.525%
0.419%
0.105%
0.322%
0.465%
2.783%
0.255%
0.765%
3.603%
0.000%
0.116%
0.000%
0.013%
0.000%
0.000%
0.395%
0.000%
0.000%
0.193%
0.000%
0.013%
0.024%
6.457%
1.624%
0.140%
0.389%
GW
2.687%
8.411%
0.012%
0.004%
0.276%
0.000%
0.438%
0.000%
0.000%
0.178%
0.000%
0.058%
0.000%
0.867%
0.005%
0.000%
0.003%
1.801%
0.121%
0.004%
0.385%
0.744%
0.217%
0.025%
1.016%
5.935%
0.606%
2.185%
4.273%
0.000%
0.544%
0.000%
0.062%
0.000%
0.000%
0.396%
0.000%
0.000%
0.522%
0.000%
0.101%
0.051%
11.109%
0.225%
0.484%
0.811%
SW
0.154%
0.000%
0.000%
0.000%
0.472%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.168%
0.000%
0.000%
0.000%
0.862%
0.000%
0.000%
0.420%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.394%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
1.906%
0.000%
0.130%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A8e. Benzene —Summary of Stage 1 (Peak) Analyses of Any Detections > 1 u.g/L (Single detections > 1 u.g/L are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>lug/L
Total
8
6
4
1
14
0
5
1
2
5
0
4
0
5
1
1
12
9
7
3
8
4
3
14
2
5
9
10
7
1
4
2
5
0
2
7
1
2
26
0
9
3
11
4
1
228
GW
5
5
4
1
12
0
5
1
2
4
0
4
0
4
1
0
6
9
7
3
7
4
3
13
2
5
9
10
7
1
4
2
5
0
2
6
1
2
26
0
7
3
11
2
1
206
SW
3
1
0
0
2
0
0
0
0
1
0
0
0
1
0
1
6
0
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
2
0
0
2
0
22
Percent of Systems
with At Least One Detection
> 1 ug/L
Total
1.290%
2.273%
0.881%
0.094%
0.383%
0.000%
0.414%
0.314%
0.132%
0.274%
0.000%
0.379%
0.000%
0.350%
0.068%
0.415%
1.671%
0.854%
0.864%
0.101%
0.506%
0.282%
0.354%
0.591%
0.952%
0.649%
0.715%
0.715%
0.964%
0.296%
0.262%
0.103%
0.696%
0.000%
1.379%
0.855%
0.408%
0.570%
0.525%
0.000%
0.563%
0.498%
0.617%
0.993%
0.329%
0.452%
GW
1.055%
2.475%
1.047%
0.099%
0.382%
0.000%
0.428%
0.317%
0.135%
0.234%
0.000%
0.391%
0.000%
0.302%
0.070%
0.000%
1.000%
0.913%
0.925%
0.103%
0.451%
0.299%
0.381%
0.583%
1.093%
0.658%
0.740%
0.735%
1.019%
0.315%
0.311%
0.110%
0.988%
0.000%
1.471%
0.793%
0.429%
1.235%
0.564%
0.000%
0.490%
0.536%
0.624%
0.823%
0.391%
0.446%
SW
2.055%
1.613%
0.000%
0.000%
0.387%
0.000%
0.000%
0.000%
0.000%
0.862%
0.000%
0.000%
0.000%
0.962%
0.000%
0.671%
5.085%
0.000%
0.000%
0.000%
3.333%
0.000%
0.000%
0.719%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.613%
0.000%
0.000%
0.000%
0.000%
1.170%
0.000%
0.000%
1.250%
0.000%
0.517%
Population Served by Systems
with At Least One Detection
>lug/L
Total
54,859
160,231
751
125
253,212
0
1,777
60
68,298
12,531
0
5,302
0
37,294
130
48,800
3,662,923
24,532
1,685
387
26,092
13,927
1,294
53,474
3,935
41,566
7,160
80,941
63,553
18,000
5,779
355
7,101
0
1,955
13,904
666
19,604
67,358
0
65,421
1,286
266,391
24,797
625
5,118,081
GW
53,850
139,177
751
125
82,880
0
1,777
60
68,298
3,561
0
5,302
0
26,319
130
0
16,750
24,532
1,685
387
15,314
13,927
1,294
31,362
3,935
41,566
7,160
80,941
63,553
18,000
5,779
355
7,101
0
1,955
3,554
666
19,604
67,358
0
1,899
1,286
266,391
535
625
1,079,744
SW
1,009
21,054
0
0
170,332
0
0
0
0
8,970
0
0
0
10,975
0
48,800
3,646,173
0
0
0
10,778
0
0
22,112
0
0
0
0
0
0
0
0
0
0
0
10,350
0
0
0
0
63,522
0
0
24,262
0
4,038,337
Percent of Population Served
with At Least One Detection
>lug/L
Total
9.050%
3.789%
0.031%
0.002%
0.707%
0.000%
0.065%
0.009%
0.390%
0.167%
0.000%
0.208%
0.000%
0.405%
0.003%
1.060%
42.805%
0.488%
0.231%
0.005%
0.612%
0.464%
0.171%
0.764%
0.700%
2.843%
0.755%
1.045%
3.741%
1.849%
0.118%
0.003%
0.228%
0.000%
0.214%
0.414%
0.250%
0.345%
0.268%
0.000%
1.241%
0.262%
6.595%
1.751%
0.140%
2.255%
GW
23.152%
12.391%
0.082%
0.004%
0.613%
0.000%
0.456%
0.014%
0.448%
0.224%
0.000%
0.370%
0.000%
0.872%
0.005%
0.000%
0.957%
2.393%
0.576%
0.020%
0.509%
0.824%
0.354%
1.810%
1.530%
6.062%
1.795%
2.984%
4.437%
6.345%
0.553%
0.011%
1.075%
0.000%
1.124%
0.485%
0.343%
1.340%
0.724%
0.000%
0.301%
0.566%
11.346%
0.225%
0.484%
1.250%
SW
0.270%
0.678%
0.000%
0.000%
0.763%
0.000%
0.000%
0.000%
0.000%
0.152%
0.000%
0.000%
0.000%
0.177%
0.000%
1.154%
53.562%
0.000%
0.000%
0.000%
0.862%
0.000%
0.000%
0.420%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.394%
0.000%
0.000%
0.000%
0.000%
1.368%
0.000%
0.000%
2.059%
0.000%
2.873%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A8f. Benzene —Summary of Stage 1 (Peak) Analyses of Any Detections > 0.5 u.g/L (Single detections > 0.5 u.g/L are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.5 ug/L
Total
14
10
5
2
21
0
6
2
7
6
0
7
1
8
2
1
18
10
9
5
12
5
3
15
5
6
16
19
10
1
5
4
5
0
3
7
1
4
33
0
9
3
16
4
2
322
GW
7
7
4
2
17
0
6
2
7
5
0
7
1
7
2
0
11
10
8
5
11
5
3
14
5
6
16
18
9
1
4
4
5
0
3
6
1
3
31
0
7
3
16
2
2
283
SW
7
3
1
0
4
0
0
0
0
1
0
0
0
1
0
1
7
0
1
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
0
1
0
1
2
0
2
0
0
2
0
39
Percent of Systems
with At Least One Detection
> 0.5 ug/L
Total
2.258%
3.788%
1.101%
0.189%
0.574%
0.000%
0.497%
0.629%
0.463%
0.329%
0.000%
0.663%
0.107%
0.560%
0.136%
0.415%
2.507%
0.949%
1.111%
0.168%
0.759%
0.353%
0.354%
0.634%
2.381%
0.778%
1.272%
1.359%
1.377%
0.296%
0.328%
0.206%
0.696%
0.000%
2.069%
0.855%
0.408%
1.140%
0.667%
0.000%
0.563%
0.498%
0.897%
0.993%
0.658%
0.638%
GW
1.477%
3.465%
1.047%
0.198%
0.542%
0.000%
0.514%
0.635%
0.471%
0.293%
0.000%
0.684%
0.114%
0.528%
0.140%
0.000%
1.833%
1.014%
1.057%
0.172%
0.709%
0.373%
0.381%
0.628%
2.732%
0.789%
1.315%
1.323%
1.310%
0.315%
0.311%
0.220%
0.988%
0.000%
2.206%
0.793%
0.429%
1.852%
0.673%
0.000%
0.490%
0.536%
0.907%
0.823%
0.781%
0.613%
SW
4.795%
4.839%
1.389%
0.000%
0.774%
0.000%
0.000%
0.000%
0.000%
0.862%
0.000%
0.000%
0.000%
0.962%
0.000%
0.671%
5.932%
0.000%
1.887%
0.000%
3.333%
0.000%
0.000%
0.719%
0.000%
0.000%
0.000%
2.703%
2.564%
0.000%
0.424%
0.000%
0.000%
0.000%
0.000%
1.613%
0.000%
0.529%
0.585%
0.000%
1.170%
0.000%
0.000%
1.250%
0.000%
0.916%
Population Served by Systems
with At Least One Detection
> 0.5 ug/L
Total
57,112
224,778
71,912
2,125
448,960
0
1,907
1,560
111,025
12,968
0
7,756
36,000
38,122
2,630
48,800
3,736,850
24,642
138,655
7,667
28,052
14,392
1,294
53,559
10,325
41,899
9,161
181,576
138,554
18,000
5,897
639
7,101
0
5,455
13,904
666
108,469
2,940,114
0
65,421
1,286
275,648
24,797
725
8,920,403
GW
54,300
172,233
751
2,125
118,825
0
1,907
1,560
111,025
3,998
0
7,756
36,000
27,147
2,630
0
53,062
24,642
1,710
7,667
17,274
14,392
1,294
31,447
10,325
41,899
9,161
138,576
65,853
18,000
5,779
639
7,101
0
5,455
3,554
666
102,719
104,845
0
1,899
1,286
275,648
535
725
1,486,410
SW
2,812
52,545
71,161
0
330,135
0
0
0
0
8,970
0
0
0
10,975
0
48,800
3,683,788
0
136,945
0
10,778
0
0
22,112
0
0
0
43,000
72,701
0
118
0
0
0
0
10,350
0
5,750
2,835,269
0
63,522
0
0
24,262
0
7,433,993
Percent of Population Served
with At Least One Detection
> 0.5 ug/L
Total
9.421%
5.315%
2.931%
0.034%
1.253%
0.000%
0.070%
0.223%
0.635%
0.173%
0.000%
0.305%
3.292%
0.414%
0.054%
1.060%
43.668%
0.491%
19.037%
0.107%
0.658%
0.479%
0.171%
0.765%
1.836%
2.866%
0.966%
2.343%
8.156%
1.849%
0.120%
0.006%
0.228%
0.000%
0.597%
0.414%
0.250%
1.908%
11.708%
0.000%
1.241%
0.262%
6.824%
1.751%
0.162%
3.931%
GW
23.346%
15.334%
0.082%
0.076%
0.879%
0.000%
0.490%
0.374%
0.728%
0.251%
0.000%
0.541%
4.298%
0.900%
0.102%
0.000%
3.032%
2.403%
0.584%
0.388%
0.574%
0.852%
0.354%
1.815%
4.015%
6.110%
2.296%
5.109%
4.598%
6.345%
0.553%
0.020%
1.075%
0.000%
3.137%
0.485%
0.343%
7.024%
1.128%
0.000%
0.301%
0.566%
11.741%
0.225%
0.561%
1.720%
SW
0.753%
1.692%
4.612%
0.000%
1.480%
0.000%
0.000%
0.000%
0.000%
0.152%
0.000%
0.000%
0.000%
0.177%
0.000%
1.154%
54.114%
0.000%
31.440%
0.000%
0.862%
0.000%
0.000%
0.420%
0.000%
0.000%
0.000%
0.854%
27.275%
0.000%
0.003%
0.000%
0.000%
0.000%
0.000%
0.394%
0.000%
0.136%
17.928%
0.000%
1.368%
0.000%
0.000%
2.059%
0.000%
5.289%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A9. Benzo[a]pyrene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 0.2 ug/L
> 0.1 ug/L
> 0.2 ug/L
> 0.1 ug/L
> 0.2 ug/L
> 0.1 ug/L
Total # Systems
Reporting
25,566
25,566
3,012
3,012
28,578
28,578
# Systems Exceeding
Threshold of Interest
9
35
5
18
14
53
% Systems Exceeding
Threshold of Interest
0.035%
0.137%
0.166%
0.598%
0.049%
0.185%
Total Pop. Served by
Systems Reporting
65,074,173
65,074,173
119,069,990
119,069,990
184,144,163
184,144,163
Total Pop. Served by
Systems Exceeding
Threshold of Interest
12,087
69,321
202,896
2,899,838
214,983
2,969,159
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.019%
0.107%
0.170%
2.435%
0.117%
1.612%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A9a. Benzo[a]pyrene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
56
606
2,242
7,083
12,762
2,518
1,316
1,084
2,409
1,477
1,721
2,237
3,838
2,294
2,368
3,024
2,806
290
309
4,761
324
2,992
13,168
51
4,480
4,193
41
4,568
1,615
2,782
897
2,067
916
3,061
956
86
10,269
7,089
488
1,324
1,392
633
1,278
119,871
GW
18
432
1,924
5,514
7,201
1,826
1,006
1,054
2,342
1,396
1,592
1,958
3,101
2,099
632
2,229
1,727
253
181
4,620
194
2,694
12,083
26
4,131
3,874
33
4,303
1,180
2,068
648
1,583
623
2,687
847
30
4,527
5,911
177
1,122
1,337
328
962
92,473
SW
38
174
318
1,569
5,561
692
310
30
67
81
129
279
737
195
1,736
795
1,079
37
128
141
130
298
1,085
25
349
319
8
265
435
714
249
484
293
374
109
56
5,742
1,178
311
202
55
305
316
27,398
Percent of Samples
with Detections
Total
0.000%
0.165%
0.089%
0.184%
0.024%
0.119%
0.456%
0.092%
0.457%
0.135%
0.116%
0.000%
0.938%
0.044%
0.465%
0.198%
0.570%
0.000%
0.000%
0.000%
0.000%
0.067%
0.076%
0.000%
0.000%
0.048%
0.000%
0.066%
0.124%
0.036%
0.111%
0.048%
1.310%
0.033%
0.000%
0.000%
0.000%
0.000%
0.820%
0.302%
0.072%
1.896%
0.000%
0.142%
GW
0.000%
0.000%
0.104%
0.236%
0.042%
0.164%
0.497%
0.000%
0.470%
0.000%
0.126%
0.000%
0.871%
0.048%
0.158%
0.135%
0.579%
0.000%
0.000%
0.000%
0.000%
0.037%
0.066%
0.000%
0.000%
0.052%
0.000%
0.023%
0.000%
0.048%
0.000%
0.063%
0.482%
0.037%
0.000%
0.000%
0.000%
0.000%
2.260%
0.357%
0.075%
2.134%
0.000%
0.124%
SW
0.000%
0.575%
0.000%
0.000%
0.000%
0.000%
0.323%
3.333%
0.000%
2.469%
0.000%
0.000%
1.221%
0.000%
0.576%
0.377%
0.556%
0.000%
0.000%
0.000%
0.000%
0.336%
0.184%
0.000%
0.000%
0.000%
0.000%
0.755%
0.460%
0.000%
0.402%
0.000%
3.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.639%
0.000%
0.201%
Minimum Detect
Concentration (u.g/L)
Total
0.14
0.14
0.02
0.01
0.22
0.04
0.09
0.01
0.4
0.01
0.02
0.07
0.02
0.02
0.01
0.15
0.02
0.1
0.18
0.03
0.19
0.02
0.007
0.11
0.07
0.1
0.01
0.03
0.02
0.007
GW
0.14
0.02
0.01
0.22
0.04
0.01
0.01
0.02
0.07
0.1
0.02
0.1
0.15
0.02
0.1
0.18
0.19
0.007
0.13
0.07
0.1
0.01
0.03
0.09
0.007
SW
0.14
0.04
0.09
0.4
0.02
0.02
0.02
0.01
0.2
0.03
0.54
0.03
0.02
0.11
0.02
0.01
Median Detect
Concentration (u.g/L)
Total
0.14
0.185
0.07
0.02
0.45
0.04
0.09
0.01
0.4
0.015
0.03
0.07
0.1
0.03
0.1
0.175
0.07
0.18
0.54
0.045
0.19
0.02
0.007
0.15
0.07
0.15
0.01
0.03
0.09
0.07
GW
0.185
0.07
0.02
0.45
0.04
0.01
0.015
0.03
0.07
0.1
0.04
0.1
0.15
0.07
0.18
0.18
0.19
0.007
0.15
0.07
0.15
0.01
0.03
0.09
0.06
SW
0.14
0.04
0.09
0.4
0.02
0.1
0.02
0.06
0.2
0.11
0.54
0.045
0.02
0.15
0.09
0.1
90th Percentile Detect
Concentration (u.g/L)
Total
0.14
0.23
0.1
0.02
0.91
0.09
0.09
0.02
0.4
0.02
0.06
0.07
0.2
0.44
0.14
0.2
0.22
0.26
0.54
0.06
0.19
0.02
0.007
0.18
0.07
0.4
0.1
0.03
0.2
0.2
GW
0.23
0.1
0.02
0.91
0.09
0.02
0.02
0.06
0.07
0.1
0.44
0.1
0.15
0.25
0.26
0.18
0.19
0.007
0.18
0.07
0.4
0.1
0.03
0.12
0.18
SW
0.14
0.04
0.09
0.4
0.09
0.27
0.1
0.18
0.2
0.19
0.54
0.06
0.02
0.25
0.5
0.34
Maximum Detect
Concentration (u.g/L)
Total
0.14
0.23
1
0.02
0.91
0.09
0.09
0.07
0.4
0.02
0.09
0.07
0.34
0.44
0.18
0.2
0.25
0.26
0.54
0.06
0.19
0.02
0.007
0.25
0.07
0.4
0.1
0.03
0.5
1
GW
0.23
1
0.02
0.91
0.09
0.07
0.02
0.06
0.07
0.1
0.44
0.1
0.15
0.25
0.26
0.18
0.19
0.007
0.18
0.07
0.4
0.1
0.03
0.12
1
SW
0.14
0.04
0.09
0.4
0.09
0.34
0.1
0.18
0.2
0.19
0.54
0.06
0.02
0.25
0.5
0.54
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A9b. Benzo[a]pyrene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
12
181
454
932
1,248
798
651
231
1,325
294
1,056
852
1,082
1,402
242
642
862
179
89
1,287
226
813
2,365
12
762
1,237
36
694
294
1,264
310
1,088
105
782
261
15
1,883
426
178
443
922
339
304
28,578
GW
7
134
382
884
1,003
580
614
228
1,304
280
1,023
798
984
1,358
93
525
794
155
62
1,258
157
753
2,228
6
751
1,196
30
658
273
1,043
233
938
97
723
240
6
1,546
389
69
410
903
195
256
25,566
SW
5
47
72
48
245
218
37
3
21
14
33
54
98
44
149
117
68
24
27
29
69
60
137
6
11
41
6
36
21
221
77
150
8
59
21
9
337
37
109
33
19
144
48
3,012
Total Population Served by Systems
Reporting
Total
245,571
3,561,828
2,453,348
6,077,394
33,260,784
4,983,378
2,588,823
632,320
16,797,224
974,583
2,543,237
1,067,176
9,085,023
4,866,706
4,602,489
8,482,868
4,906,096
482,407
5,100,237
3,934,332
928,947
753,259
6,885,177
25,377
1,455,834
945,754
1,444,605
1,661,547
961,367
4,879,789
6,600,708
2,937,559
902,560
3,439,550
622,272
1,439,720
21,494,935
2,500,671
2,179,119
433,067
3,201,690
1,358,655
446,177
184,144,163
GW
13,636
783,747
910,322
2,706,803
11,815,880
519,459
261,556
350,920
14,555,604
282,561
1,434,611
820,768
2,890,945
2,546,970
375,460
1,680,486
907,989
112,465
379,121
2,684,691
284,141
360,590
1,733,551
18,348
679,354
395,955
143,223
1,398,649
271,476
946,878
622,035
572,809
163,122
812,767
263,101
848,945
5,731,435
1,667,485
28,420
181,903
1,581,206
205,557
129,229
65,074,173
SW
231,935
2,778,081
1,543,026
3,370,591
21,444,904
4,463,919
2,327,267
281,400
2,241,620
692,022
1,108,626
246,408
6,194,078
2,319,736
4,227,029
6,802,382
3,998,107
369,942
4,721,116
1,249,641
644,806
392,669
5,151,626
7,029
776,480
549,799
1,301,382
262,898
689,891
3,932,911
5,978,673
2,364,750
739,438
2,626,783
359,171
590,775
15,763,500
833,186
2,150,699
251,164
1,620,484
1,153,098
316,948
119,069,990
Percent of Systems
with At Least One Detection
Total
0.000%
0.552%
0.441%
1.180%
0.160%
0.376%
0.922%
0.433%
0.453%
0.340%
0.189%
0.000%
3.050%
0.071%
3.719%
0.779%
1.624%
0.000%
0.000%
0.000%
0.000%
0.246%
0.423%
0.000%
0.000%
0.162%
0.000%
0.288%
0.680%
0.079%
0.323%
0.092%
2.857%
0.128%
0.000%
0.000%
0.000%
0.000%
1.685%
0.903%
0.108%
2.950%
0.000%
0.490%
GW
0.000%
0.000%
0.524%
1.244%
0.199%
0.517%
0.814%
0.000%
0.460%
0.000%
0.196%
0.000%
2.541%
0.074%
1.075%
0.571%
1.259%
0.000%
0.000%
0.000%
0.000%
0.133%
0.359%
0.000%
0.000%
0.167%
0.000%
0.152%
0.000%
0.096%
0.000%
0.107%
1.031%
0.138%
0.000%
0.000%
0.000%
0.000%
4.348%
0.976%
0.111%
3.590%
0.000%
0.399%
SW
0.000%
2.128%
0.000%
0.000%
0.000%
0.000%
2.703%
33.333%
0.000%
7.143%
0.000%
0.000%
8.163%
0.000%
5.369%
1.709%
5.882%
0.000%
0.000%
0.000%
0.000%
1.667%
1.460%
0.000%
0.000%
0.000%
0.000%
2.778%
9.524%
0.000%
1.299%
0.000%
25.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.083%
0.000%
1.262%
Percent of Population Served
with At Least One Detection
Total
0.000%
6.899%
0.160%
1.141%
0.005%
0.026%
1.569%
22.141%
15.786%
0.274%
1.045%
0.000%
3.144%
0.002%
29.029%
2.450%
72.257%
0.000%
0.000%
0.000%
0.000%
4.176%
6.376%
0.000%
0.000%
0.827%
0.000%
4.381%
1.456%
0.082%
0.727%
0.022%
13.226%
0.006%
0.000%
0.000%
0.000%
0.000%
0.084%
0.824%
0.001%
0.791%
0.000%
5.057%
GW
0.000%
0.000%
0.431%
2.563%
0.015%
0.252%
1.743%
0.000%
18.217%
0.000%
1.853%
0.000%
3.677%
0.003%
0.557%
0.017%
0.801%
0.000%
0.000%
0.000%
0.000%
0.083%
0.262%
0.000%
0.000%
1.976%
0.000%
0.007%
0.000%
0.422%
0.000%
0.113%
0.067%
0.027%
0.000%
0.000%
0.000%
0.000%
6.464%
1.962%
0.003%
0.672%
0.000%
4.456%
SW
0.000%
8.845%
0.000%
0.000%
0.000%
0.000%
1.550%
49.751%
0.000%
0.386%
0.000%
0.000%
2.896%
0.000%
31.558%
3.052%
88.485%
0.000%
0.000%
0.000%
0.000%
7.934%
8.433%
0.000%
0.000%
0.000%
0.000%
27.654%
2.029%
0.000%
0.803%
0.000%
16.129%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.812%
0.000%
5.385%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A9c. Benzo[a]pyrene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.2 ug/L
Total
0
0
1
1
0
3
0
0
0
1
0
0
0
0
1
1
0
0
0
0
0
0
1
0
0
1
0
1
0
0
0
0
1
0
0
0
0
0
1
0
0
1
0
14
GW
0
0
1
1
0
3
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
9
sw
0
0
0
0
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
0
0
0
1
0
5
Percent of Systems
with At Least One Detection
> 0.2 ug/L
Total
0.000%
0.000%
0.220%
0.107%
0.000%
0.376%
0.000%
0.000%
0.000%
0.340%
0.000%
0.000%
0.000%
0.000%
0.413%
0.156%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.042%
0.000%
0.000%
0.081%
0.000%
0.144%
0.000%
0.000%
0.000%
0.000%
0.952%
0.000%
0.000%
0.000%
0.000%
0.000%
0.562%
0.000%
0.000%
0.295%
0.000%
0.049%
GW
0.000%
0.000%
0.262%
0.113%
0.000%
0.517%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.190%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.045%
0.000%
0.000%
0.084%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.449%
0.000%
0.000%
0.000%
0.000%
0.035%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
7.143%
0.000%
0.000%
0.000%
0.000%
0.671%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.778%
0.000%
0.000%
0.000%
0.000%
12.500%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.694%
0.000%
0.166%
Population Served by Systems
with At Least One Detection
> 0.2 ug/L
Total
0
0
1,964
5,005
0
1,308
0
0
0
2,671
0
0
0
0
54,887
60
0
0
0
0
0
0
950
0
0
1,750
0
72,701
0
0
0
0
68,263
0
0
0
0
0
1,050
0
0
4,374
0
214,983
GW
0
0
1,964
5,005
0
1,308
0
0
0
0
0
0
0
0
0
60
0
0
0
0
0
0
950
0
0
1,750
0
0
0
0
0
0
0
0
0
0
0
0
1,050
0
0
0
0
12,087
SW
0
0
0
0
0
0
0
0
0
2,671
0
0
0
0
54,887
0
0
0
0
0
0
0
0
0
0
0
0
72,701
0
0
0
0
68,263
0
0
0
0
0
0
0
0
4,374
0
202,896
Percent of Population Served
with At Least One Detection
> 0.2 ug/L
Total
0.000%
0.000%
0.080%
0.082%
0.000%
0.026%
0.000%
0.000%
0.000%
0.274%
0.000%
0.000%
0.000%
0.000%
1.193%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.014%
0.000%
0.000%
0.185%
0.000%
4.376%
0.000%
0.000%
0.000%
0.000%
7.563%
0.000%
0.000%
0.000%
0.000%
0.000%
0.048%
0.000%
0.000%
0.322%
0.000%
0.117%
GW
0.000%
0.000%
0.216%
0.185%
0.000%
0.252%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.055%
0.000%
0.000%
0.442%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.695%
0.000%
0.000%
0.000%
0.000%
0.019%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.386%
0.000%
0.000%
0.000%
0.000%
1.298%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
27.654%
0.000%
0.000%
0.000%
0.000%
9.232%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.379%
0.000%
0.170%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A9d. Benzo[a]pyrene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.1 ug/L
Total
0
1
2
2
0
3
0
0
0
1
0
0
0
0
6
2
13
0
0
0
0
2
4
0
0
2
0
2
0
1
0
0
3
0
0
0
0
0
3
1
0
5
0
53
GW
0
0
2
2
0
3
0
0
0
0
0
0
0
0
1
1
10
0
0
0
0
1
3
0
0
2
0
1
0
1
0
0
1
0
0
0
0
0
3
1
0
3
0
35
SW
0
1
0
0
0
0
0
0
0
1
0
0
0
0
5
1
3
0
0
0
0
1
1
0
0
0
0
1
0
0
0
0
2
0
0
0
0
0
0
0
0
2
0
18
Percent of Systems
with At Least One Detection
> 0.1 ug/L
Total
0.000%
0.552%
0.441%
0.215%
0.000%
0.376%
0.000%
0.000%
0.000%
0.340%
0.000%
0.000%
0.000%
0.000%
2.479%
0.312%
1.508%
0.000%
0.000%
0.000%
0.000%
0.246%
0.169%
0.000%
0.000%
0.162%
0.000%
0.288%
0.000%
0.079%
0.000%
0.000%
2.857%
0.000%
0.000%
0.000%
0.000%
0.000%
1.685%
0.226%
0.000%
1.475%
0.000%
0.185%
GW
0.000%
0.000%
0.524%
0.226%
0.000%
0.517%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.075%
0.190%
1.259%
0.000%
0.000%
0.000%
0.000%
0.133%
0.135%
0.000%
0.000%
0.167%
0.000%
0.152%
0.000%
0.096%
0.000%
0.000%
1.031%
0.000%
0.000%
0.000%
0.000%
0.000%
4.348%
0.244%
0.000%
1.538%
0.000%
0.137%
SW
0.000%
2.128%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
7.143%
0.000%
0.000%
0.000%
0.000%
3.356%
0.855%
4.412%
0.000%
0.000%
0.000%
0.000%
1.667%
0.730%
0.000%
0.000%
0.000%
0.000%
2.778%
0.000%
0.000%
0.000%
0.000%
25.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.389%
0.000%
0.598%
Population Served by Systems
with At Least One Detection
> 0.1 ug/L
Total
0
245,727
3,927
37,296
0
1,308
0
0
0
2,671
0
0
0
0
429,804
163,881
1,834,995
0
0
0
0
31,455
5,016
0
0
7,825
0
72,793
0
4,000
0
0
119,372
0
0
0
0
0
1,837
308
0
6,944
0
2,969,159
GW
0
0
3,927
37,296
0
1,308
0
0
0
0
0
0
0
0
2,092
60
7,276
0
0
0
0
300
2,121
0
0
7,825
0
92
0
4,000
0
0
109
0
0
0
0
0
1,837
308
0
770
0
69,321
SW
0
245,727
0
0
0
0
0
0
0
2,671
0
0
0
0
427,712
163,821
1,827,719
0
0
0
0
31,155
2,895
0
0
0
0
72,701
0
0
0
0
119,263
0
0
0
0
0
0
0
0
6,174
0
2,899,838
Percent of Population Served
with At Least One Detection
> 0.1 ug/L
Total
0.000%
6.899%
0.160%
0.614%
0.000%
0.026%
0.000%
0.000%
0.000%
0.274%
0.000%
0.000%
0.000%
0.000%
9.339%
1.932%
37.402%
0.000%
0.000%
0.000%
0.000%
4.176%
0.073%
0.000%
0.000%
0.827%
0.000%
4.381%
0.000%
0.082%
0.000%
0.000%
13.226%
0.000%
0.000%
0.000%
0.000%
0.000%
0.084%
0.071%
0.000%
0.511%
0.000%
1.612%
GW
0.000%
0.000%
0.431%
1.378%
0.000%
0.252%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.557%
0.004%
0.801%
0.000%
0.000%
0.000%
0.000%
0.083%
0.122%
0.000%
0.000%
1.976%
0.000%
0.007%
0.000%
0.422%
0.000%
0.000%
0.067%
0.000%
0.000%
0.000%
0.000%
0.000%
6.464%
0.169%
0.000%
0.375%
0.000%
0.107%
SW
0.000%
8.845%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.386%
0.000%
0.000%
0.000%
0.000%
10.119%
2.408%
45.715%
0.000%
0.000%
0.000%
0.000%
7.934%
0.056%
0.000%
0.000%
0.000%
0.000%
27.654%
0.000%
0.000%
0.000%
0.000%
16.129%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.535%
0.000%
2.435%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A10. Beryllium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration or
Threshold of
Interest
> 0.004 mg/L
> 0.002 mg/L
> 0.004 mg/L
> 0.002 mg/L
> 0.004 mg/L
> 0.002 mg/L
Total # Systems
Reporting
44,015
44,015
4,006
4,006
48,021
48,021
# Systems Exceeding
Threshold of Interest
41
202
12
48
53
250
% Systems Exceeding
Threshold of Interest
0.093%
0.459%
0.300%
1.198%
0.110%
0.521%
Total Pop. Served by
Systems Reporting
84,495,418
84,495,418
136,888,401
136,888,401
221,383,819
221,383,819
Total Pop. Served by
Systems Exceeding
Threshold of Interest
148,433
1,453,696
2,918,844
4,332,647
3,067,277
5,786,343
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.176%
1.720%
2.132%
3.165%
1.386%
2.614%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table AlOa. Beryllium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
1,493
2,648
2,164
6,329
35,134
4,378
2,223
691
2,146
2,706
1,177
50
3,095
2,783
4,716
1,781
2,971
5,075
2,313
6,727
4,436
5,682
3,185
9,208
345
2,977
3,082
6,572
3,519
2,113
3,292
4,628
393
1,312
860
3,077
388
1,895
14,911
6,937
2,803
2,119
6,992
1,122
1,127
183,575
GW
1,060
1,805
1,503
4,958
20,685
2,329
1,838
643
2,077
2,382
1,115
31
2,812
2,384
4,235
534
2,004
3,964
1,928
6,548
4,357
4,907
2,838
7,773
303
2,868
2,918
5,851
3,193
1,550
2,493
3,991
330
953
633
2,664
359
668
12,329
5,434
2,195
1,773
6,821
420
876
143,332
SW
433
843
661
1,371
14,449
2,049
385
48
69
324
62
19
283
399
481
1,247
967
1,111
385
179
79
775
347
1,435
42
109
164
721
326
563
799
637
63
359
111
413
29
1,227
2,582
1,503
608
346
171
702
251
40,243
Percent of Samples
with Detections
Total
1.005%
1.095%
0.046%
0.442%
0.507%
1.782%
0.720%
14.616%
9.599%
0.000%
0.000%
0.000%
1.551%
0.467%
2.990%
2.134%
1.548%
0.611%
1.167%
2.661%
0.045%
0.070%
0.283%
1.205%
1.739%
0.000%
6.100%
0.776%
0.796%
0.615%
0.608%
0.454%
0.254%
0.076%
7.791%
0.422%
0.515%
2.902%
0.027%
0.764%
0.606%
0.236%
5.335%
3.209%
0.799%
1.233%
GW
0.943%
0.554%
0.000%
0.444%
0.503%
2.276%
0.871%
15.708%
9.870%
0.000%
0.000%
0.000%
1.600%
0.461%
3.093%
2.060%
1.597%
0.681%
1.193%
2.703%
0.046%
0.082%
0.247%
1.248%
1.650%
0.000%
6.443%
0.735%
0.752%
0.516%
0.682%
0.476%
0.000%
0.105%
10.111%
0.488%
0.557%
4.790%
0.032%
0.074%
0.729%
0.282%
5.454%
4.762%
0.799%
1.348%
SW
1.155%
2.254%
0.151%
0.438%
0.512%
1.220%
0.000%
0.000%
1.449%
0.000%
0.000%
0.000%
1.060%
0.501%
2.079%
2.165%
1.448%
0.360%
1.039%
1.117%
0.000%
0.000%
0.576%
0.976%
2.381%
0.000%
0.000%
1.110%
1.227%
0.888%
0.375%
0.314%
1.587%
0.000%
1.322%
0.000%
0.000%
1.874%
0.000%
3.260%
0.164%
0.000%
0.585%
2.279%
0.797%
0.825%
Minimum Detect
Concentration (mg/L)
Total
0.00013
0.00008
0.002
0.0001
2.1E-05
4.8E-05
0.0002
0.0001
0.0001
0.0002
0.001
3.7E-05
0.0001
0.0002
0.0001
0.0003
0.0001
0.00065
0.00106
0.0001
0.0001
0.00073
0.0004
0.0001
0.0002
0.00023
0.00006
0.00022
0.0013
0.0025
0.0002
0.001
0.003
0.00003
0.001
0.0002
0.0005
0.0003
2.2E-05
0.0001
0.0005
2.1E-05
GW
0.00013
0.001
0.0001
2.1E-05
0.00008
0.0002
0.0001
0.0001
0.0002
0.001
3.7E-05
0.0001
0.0002
0.0004
0.0003
0.0001
0.00065
0.00106
0.0001
0.0001
0.00073
0.0004
0.0001
0.0002
0.00023
0.00006
0.00022
0.0025
0.0002
0.001
0.003
0.0003
0.001
0.0003
0.0005
0.0003
2.2E-05
0.00012
0.0005
2.1E-05
SW
0.00079
0.00008
0.002
0.0001
2.1E-05
4.8E-05
0.0002
0.0004
0.001
0.0001
0.0002
0.0003
0.0001
0.0003
0.0001
0.001
0.0004
0.00149
0.00026
0.0002
0.001
0.002
0.00038
0.0013
0.0002
0.00003
0.0002
0.002
0.0002
0.0001
0.0006
2.1E-05
Median Detect
Concentration (mg/L)
Total
0.0009
0.001
0.002
0.001
0.001
0.001
0.0015
0.0005
0.0001
0.0005
0.001
0.0003
0.001
0.001
0.001
0.0003
0.0001
0.00133
0.00112
0.001
0.001
0.00308
0.0033
0.001
0.002
0.001
0.00125
0.00035
0.0013
0.0025
0.0004
0.004
0.0035
0.0004
0.00335
0.001
0.002
0.001
0.00009
0.001
0.0007
0.0005
GW
0.0006
0.001
0.001
0.001
0.001
0.0015
0.0005
0.0001
0.0005
0.0016
0.0003
0.002
0.001
0.001
0.0003
0.0001
0.00133
0.00112
0.001
0.001
0.00375
0.0033
0.001
0.006
0.001
0.001
0.00032
0.0025
0.0004
0.004
0.0035
0.0004
0.00335
0.0009
0.002
0.001
0.00009
0.001
0.0007
0.0004
SW
0.0016
0.001
0.002
0.00185
0.001
0.0008
0.0002
0.0004
0.001
0.0003
0.001
0.001
0.01525
0.0003
0.00015
0.001
0.002
0.00149
0.0006
0.0003
0.001
0.002
0.00069
0.0013
0.0002
0.00038
0.001
0.002
0.0002
0.001
0.00085
0.001
90th Percentile Detect
Concentration (mg/L)
Total
0.002
0.002
0.002
0.004
0.00218
0.002
0.004
0.0011
0.001
0.0031
0.003
0.001
0.003
0.0032
0.0032
0.0005
0.0002
0.002
0.00182
0.001
0.0027
0.0045
0.01
0.004
0.01
0.002
0.00285
0.001
0.0013
0.0025
0.0017
0.0054
0.004
0.001
0.004
0.0017
0.01
0.004
0.00053
0.0011
0.003
0.003
GW
0.0019
0.0035
0.002
0.002
0.002
0.004
0.0011
0.001
0.0031
0.003
0.0008
0.0025
0.0026
0.002
0.0005
0.0002
0.002
0.00182
0.001
0.003
0.0045
0.01
0.004
0.01
0.002
0.002
0.0011
0.0025
0.0017
0.0054
0.004
0.0014
0.004
0.0021
0.01
0.004
0.00053
0.001
0.003
0.003
SW
0.0021
0.002
0.002
0.005
0.003
0.002
0.0002
0.0007
0.001
0.00215
0.003
0.004
0.03
0.0003
0.0002
0.001
0.0027
0.00149
0.002
0.0004
0.001
0.004
0.001
0.0013
0.0004
0.00074
0.0017
0.002
0.0002
0.007
0.0011
0.002
Maximum Detect
Concentration (mg/L)
Total
0.0021
0.005
0.002
0.005
0.03
0.004
0.01
0.0025
0.0053
0.01
0.004
0.007
0.05
0.004
0.03
0.0035
0.002
0.002
0.00182
0.001
0.005
0.0045
0.02
0.05
0.02
0.002
0.004
0.00177
0.0013
0.0025
0.0054
0.0084
0.004
0.14
0.004
0.01
0.03
0.004
0.004
0.01
0.003
0.14
GW
0.002
0.005
0.004
0.006
0.004
0.01
0.0025
0.0053
0.01
0.004
0.007
0.003
0.004
0.004
0.0035
0.002
0.002
0.00182
0.001
0.005
0.0045
0.02
0.05
0.02
0.002
0.0037
0.00177
0.0025
0.0054
0.0084
0.004
0.14
0.004
0.0021
0.03
0.004
0.004
0.001
0.003
0.14
SW
0.0021
0.002
0.002
0.005
0.03
0.002
0.0002
0.0007
0.001
0.003
0.05
0.004
0.03
0.0003
0.0002
0.001
0.0027
0.00149
0.002
0.0004
0.001
0.004
0.001
0.0013
0.0004
0.0021
0.01
0.002
0.0002
0.01
0.0011
0.05
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table AlOb. Beryllium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
610
352
453
1,051
3,750
838
1,170
281
1,335
1,593
107
26
924
1,241
1,623
242
676
1,038
802
3,033
1,593
1,421
849
2,284
217
743
1,216
1,374
724
335
1,551
1,931
182
731
143
800
234
351
4,930
507
1,582
601
1,822
451
304
48,021
GW
467
279
381
1,003
3,232
617
1,131
278
1,309
1,479
95
17
875
1,140
1,574
93
558
970
748
2,980
1,564
1,344
789
2,145
190
732
1,175
1,337
685
314
1,315
1,806
166
610
134
735
223
162
4,587
457
1,414
558
1,802
290
255
44,015
SW
143
73
72
48
518
221
39
3
26
114
12
9
49
101
49
149
118
68
54
53
29
77
60
139
27
11
41
37
39
21
236
125
16
121
9
65
11
189
343
50
168
43
20
161
49
4,006
Total Population Served by Systems
Reporting
Total
592,922
4,701,100
2,452,800
6,158,655
36,248,264
4,998,506
2,716,176
679,823
17,374,897
7,242,523
1,303,767
550,757
1,078,426
9,078,639
4,980,057
4,602,489
8,525,575
5,022,488
727,134
6,717,830
4,265,162
3,006,743
757,930
6,973,609
563,069
1,450,223
942,517
7,762,423
1,667,433
973,342
4,377,347
10,224,557
679,606
2,770,064
913,584
3,464,762
339,259
5,685,258
25,070,435
2,543,652
4,803,450
490,989
4,043,916
1,415,477
446,184
221,383,819
GW
230,950
1,463,066
909,774
2,788,064
13,499,435
533,275
382,254
398,423
15,128,855
1,350,192
1,249,139
40,080
833,516
2,879,411
2,619,602
375,460
1,718,151
1,024,381
291,530
1,925,399
3,015,521
1,692,282
365,261
1,708,443
257,844
673,743
392,718
2,726,477
1,400,885
283,451
1,214,207
3,129,620
268,651
486,818
173,606
806,235
247,298
1,462,502
9,285,450
1,686,017
634,384
227,021
2,352,172
234,687
129,168
84,495,418
SW
361,972
3,238,034
1,543,026
3,370,591
22,748,829
4,465,231
2,333,922
281,400
2,246,042
5,892,331
54,628
510,677
244,910
6,199,228
2,360,455
4,227,029
6,807,424
3,998,107
435,604
4,792,431
1,249,641
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,163,140
7,094,937
410,955
2,283,246
739,978
2,658,527
91,961
4,222,756
15,784,985
857,635
4,169,066
263,968
1,691,744
1,180,790
317,016
136,888,401
Percent of Systems
with At Least One Detection
Total
2.459%
4.830%
0.221%
1.998%
1.813%
6.325%
1.368%
22.420%
11.011%
0.000%
0.000%
0.000%
4.329%
0.967%
7.394%
12.810%
4.290%
2.505%
3.367%
5.407%
0.126%
0.281%
0.824%
4.291%
2.765%
0.000%
1.645%
3.275%
1.519%
2.985%
1.225%
1.036%
0.549%
0.137%
19.580%
1.500%
0.855%
10.826%
0.061%
0.986%
0.822%
0.666%
14.160%
7.095%
2.632%
3.117%
GW
2.141%
2.151%
0.000%
1.595%
1.454%
5.997%
1.415%
22.662%
11.154%
0.000%
0.000%
0.000%
4.343%
0.877%
7.116%
9.677%
3.943%
2.371%
3.075%
5.436%
0.128%
0.298%
0.760%
4.009%
2.632%
0.000%
1.702%
2.842%
1.460%
2.229%
1.293%
0.997%
0.000%
0.164%
19.403%
1.633%
0.897%
10.494%
0.065%
0.875%
0.849%
0.717%
14.262%
6.897%
2.353%
2.992%
SW
3.497%
15.068%
1.389%
10.417%
4.054%
7.240%
0.000%
0.000%
3.846%
0.000%
0.000%
0.000%
4.082%
1.980%
16.327%
14.765%
5.932%
4.412%
7.407%
3.774%
0.000%
0.000%
1.667%
8.633%
3.704%
0.000%
0.000%
18.919%
2.564%
14.286%
0.847%
1.600%
6.250%
0.000%
22.222%
0.000%
0.000%
11.111%
0.000%
2.000%
0.595%
0.000%
5.000%
7.453%
4.082%
4.493%
Percent of Population Served
with At Least One Detection
Total
8.605%
26.150%
0.013%
32.913%
10.064%
17.833%
0.105%
18.969%
28.888%
0.000%
0.000%
0.000%
15.564%
41.167%
15.905%
30.400%
44.526%
39.893%
2.585%
9.781%
0.500%
0.206%
5.358%
11.011%
0.524%
0.000%
0.405%
18.075%
28.874%
40.492%
1.469%
2.281%
0.221%
0.002%
11.416%
0.599%
0.040%
13.378%
0.001%
12.644%
0.155%
0.167%
6.055%
2.837%
3.464%
13.780%
GW
21.565%
1.913%
0.000%
1.173%
11.304%
3.198%
0.748%
32.366%
33.158%
0.000%
0.000%
0.000%
18.388%
0.984%
12.690%
27.072%
6.093%
28.140%
1.392%
15.642%
0.708%
0.366%
2.588%
7.487%
0.999%
0.000%
0.971%
9.738%
33.597%
0.936%
4.159%
0.419%
0.000%
0.009%
44.411%
2.576%
0.055%
7.009%
0.002%
0.570%
0.771%
0.362%
9.951%
1.698%
1.059%
11.296%
SW
0.336%
37.102%
0.021%
59.167%
9.328%
19.581%
0.000%
0.000%
0.126%
0.000%
0.000%
0.000%
5.952%
59.831%
19.472%
30.696%
54.227%
42.905%
3.383%
7.426%
0.000%
0.000%
7.934%
12.155%
0.122%
0.000%
0.000%
22.588%
4.052%
56.744%
0.437%
3.102%
0.365%
0.000%
3.674%
0.000%
0.000%
15.584%
0.000%
36.379%
0.061%
0.000%
0.638%
3.063%
4.443%
15.313%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table AlOc. Beryllium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.004 mg/L
Total
0
1
0
2
6
0
1
0
1
0
0
0
3
0
4
1
0
1
0
0
0
0
0
3
2
0
11
4
1
0
0
0
0
0
1
5
0
1
0
1
2
0
0
2
0
53
GW
0
1
0
0
1
0
1
0
1
0
0
0
3
0
4
0
0
0
0
0
0
0
0
3
2
0
11
4
1
0
0
0
0
0
1
5
0
1
0
0
2
0
0
0
0
41
SW
0
0
0
2
5
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
2
0
12
Percent of Systems
with At Least One Detection
> 0.004 mg/L
Total
0.000%
0.284%
0.000%
0.190%
0.160%
0.000%
0.085%
0.000%
0.075%
0.000%
0.000%
0.000%
0.325%
0.000%
0.246%
0.413%
0.000%
0.096%
0.000%
0.000%
0.000%
0.000%
0.000%
0.131%
0.922%
0.000%
0.905%
0.291%
0.138%
0.000%
0.000%
0.000%
0.000%
0.000%
0.699%
0.625%
0.000%
0.285%
0.000%
0.197%
0.126%
0.000%
0.000%
0.443%
0.000%
0.110%
GW
0.000%
0.358%
0.000%
0.000%
0.031%
0.000%
0.088%
0.000%
0.076%
0.000%
0.000%
0.000%
0.343%
0.000%
0.254%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.140%
1.053%
0.000%
0.936%
0.299%
0.146%
0.000%
0.000%
0.000%
0.000%
0.000%
0.746%
0.680%
0.000%
0.617%
0.000%
0.000%
0.141%
0.000%
0.000%
0.000%
0.000%
0.093%
SW
0.000%
0.000%
0.000%
4.167%
0.965%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
0.000%
1.471%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.000%
0.000%
0.000%
0.000%
1.242%
0.000%
0.300%
Population Served by Systems
with At Least One Detection
> 0.004 mg/L
Total
0
450
0
700
5,079
0
48
0
56,055
0
0
0
49,871
0
1,044
886,428
0
1,710,000
0
0
0
0
0
1,587
792
0
1,432
16,984
300
0
0
0
0
0
25
18,888
0
500
0
312,000
184
0
0
4,910
0
3,067,277
GW
0
450
0
0
273
0
48
0
56,055
0
0
0
49,871
0
1,044
0
0
0
0
0
0
0
0
1,587
792
0
1,432
16,984
300
0
0
0
0
0
25
18,888
0
500
0
0
184
0
0
0
0
148,433
SW
0
0
0
700
4,806
0
0
0
0
0
0
0
0
0
0
886,428
0
1,710,000
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
312,000
0
0
0
4,910
0
2,918,844
Percent of Population Served
with At Least One Detection
> 0.004 mg/L
Total
0.000%
0.010%
0.000%
0.011%
0.014%
0.000%
0.002%
0.000%
0.323%
0.000%
0.000%
0.000%
4.624%
0.000%
0.021%
19.260%
0.000%
34.047%
0.000%
0.000%
0.000%
0.000%
0.000%
0.023%
0.141%
0.000%
0.152%
0.219%
0.018%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.545%
0.000%
0.009%
0.000%
12.266%
0.004%
0.000%
0.000%
0.347%
0.000%
1.386%
GW
0.000%
0.031%
0.000%
0.000%
0.002%
0.000%
0.013%
0.000%
0.371%
0.000%
0.000%
0.000%
5.983%
0.000%
0.040%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.093%
0.307%
0.000%
0.365%
0.623%
0.021%
0.000%
0.000%
0.000%
0.000%
0.000%
0.014%
2.343%
0.000%
0.034%
0.000%
0.000%
0.029%
0.000%
0.000%
0.000%
0.000%
0.176%
SW
0.000%
0.000%
0.000%
0.021%
0.021%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
20.970%
0.000%
42.770%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
36.379%
0.000%
0.000%
0.000%
0.416%
0.000%
2.132%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table AlOd. Beryllium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.002 mg/L
Total
3
5
1
9
20
9
8
3
4
0
0
0
6
5
9
11
12
8
1
1
1
0
0
35
4
0
19
14
5
2
8
0
0
1
5
11
2
3
2
2
11
1
5
3
1
250
GW
1
2
0
6
11
6
8
3
4
0
0
0
6
5
8
5
8
7
1
1
1
0
0
29
4
0
19
13
5
2
6
0
0
1
5
11
2
2
2
1
10
1
5
0
1
202
SW
2
3
1
3
9
3
0
0
0
0
0
0
0
0
1
6
4
1
0
0
0
0
0
6
0
0
0
1
0
0
2
0
0
0
0
0
0
1
0
1
1
0
0
3
0
48
Percent of Systems
with At Least One Detection
> 0.002 mg/L
Total
0.492%
1.420%
0.221%
0.856%
0.533%
1.074%
0.684%
1.068%
0.300%
0.000%
0.000%
0.000%
0.649%
0.403%
0.555%
4.545%
1.775%
0.771%
0.125%
0.033%
0.063%
0.000%
0.000%
1.532%
1.843%
0.000%
1.563%
1.019%
0.691%
0.597%
0.516%
0.000%
0.000%
0.137%
3.497%
1.375%
0.855%
0.855%
0.041%
0.394%
0.695%
0.166%
0.274%
0.665%
0.329%
0.521%
GW
0.214%
0.717%
0.000%
0.598%
0.340%
0.972%
0.707%
1.079%
0.306%
0.000%
0.000%
0.000%
0.686%
0.439%
0.508%
5.376%
1.434%
0.722%
0.134%
0.034%
0.064%
0.000%
0.000%
1.352%
2.105%
0.000%
1.617%
0.972%
0.730%
0.637%
0.456%
0.000%
0.000%
0.164%
3.731%
1.497%
0.897%
1.235%
0.044%
0.219%
0.707%
0.179%
0.277%
0.000%
0.392%
0.459%
SW
1.399%
4.110%
1.389%
6.250%
1.737%
1.357%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.041%
4.027%
3.390%
1.471%
0.000%
0.000%
0.000%
0.000%
0.000%
4.317%
0.000%
0.000%
0.000%
2.703%
0.000%
0.000%
0.847%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.529%
0.000%
2.000%
0.595%
0.000%
0.000%
1.863%
0.000%
1.198%
Population Served by Systems
with At Least One Detection
> 0.002 mg/L
Total
47,943
130,453
322
312,265
619,385
304,648
2,077
1,250
239,239
0
0
0
65,695
10,837
115,821
957,616
144,576
1,711,392
190
150
21,000
0
0
57,304
2,430
0
3,783
101,806
461,146
153
59,147
0
0
42
38,552
20,367
135
31,242
52
312,118
6,446
468
1,218
5,040
35
5,786,343
GW
47,290
2,131
0
11,565
144,012
2,648
2,077
1,250
239,239
0
0
0
65,695
10,837
114,037
1,456
76,370
1,392
190
150
21,000
0
0
24,166
2,430
0
3,783
101,676
461,146
153
45,320
0
0
42
38,552
20,367
135
8,788
52
118
3,908
468
1,218
0
35
1,453,696
SW
653
128,322
322
300,700
475,373
302,000
0
0
0
0
0
0
0
0
1,784
956,160
68,206
1,710,000
0
0
0
0
0
33,138
0
0
0
130
0
0
13,827
0
0
0
0
0
0
22,454
0
312,000
2,538
0
0
5,040
0
4,332,647
Percent of Population Served
with At Least One Detection
> 0.002 mg/L
Total
8.086%
2.775%
0.013%
5.070%
1.709%
6.095%
0.076%
0.184%
1.377%
0.000%
0.000%
0.000%
6.092%
0.119%
2.326%
20.806%
1.696%
34.075%
0.026%
0.002%
0.492%
0.000%
0.000%
0.822%
0.432%
0.000%
0.401%
1.312%
27.656%
0.016%
1.351%
0.000%
0.000%
0.002%
4.220%
0.588%
0.040%
0.550%
0.000%
12.270%
0.134%
0.095%
0.030%
0.356%
0.008%
2.614%
GW
20.476%
0.146%
0.000%
0.415%
1.067%
0.497%
0.543%
0.314%
1.581%
0.000%
0.000%
0.000%
7.882%
0.376%
4.353%
0.388%
4.445%
0.136%
0.065%
0.008%
0.696%
0.000%
0.000%
1.415%
0.942%
0.000%
0.963%
3.729%
32.918%
0.054%
3.732%
0.000%
0.000%
0.009%
22.207%
2.526%
0.055%
0.601%
0.001%
0.007%
0.616%
0.206%
0.052%
0.000%
0.027%
1.720%
SW
0.180%
3.963%
0.021%
8.921%
2.090%
6.763%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.076%
22.620%
1.002%
42.770%
0.000%
0.000%
0.000%
0.000%
0.000%
0.629%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.437%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.532%
0.000%
36.379%
0.061%
0.000%
0.000%
0.427%
0.000%
3.165%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table All. Beta Particles — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 50 pCi/L
> 25 pCi/L
> 50 pCi/L
> 25 pCi/L
> 50 pCi/L
> 25 pCi/L
Total # Systems
Reporting
12,505
12,505
1,726
1,726
14,231
14,231
# Systems Exceeding
Threshold of Interest
68
302
7
33
75
335
% Systems Exceeding
Threshold of Interest
0.544%
2.415%
0.406%
1.912%
0.527%
2.354%
Total Pop. Served by
Systems Reporting
31,262,033
31,262,033
89,012,891
89,012,891
120,274,924
120,274,924
Total Pop. Served by
Systems Exceeding
Threshold of Interest
540,849
1,662,946
936,487
7,998,101
1,477,336
9,661,047
% Pop. Served by
Systems Exceeding
Threshold of Interest
1.730%
5.319%
1.052%
8.985%
1.228%
8.032%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table Alia. Beta Particles — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
204
375
2,521
375
5,499
2,303
232
24
9
1,774
7,490
128
68
558
1,709
1,121
63
17
8,111
53
2,815
1,731
2,047
841
53
362
2
12,450
3,029
1,489
3
2,487
39
1
59,983
GW
156
215
1,908
92
1,685
1,658
195
0
3
1,500
6,972
128
10
333
1,357
1,098
63
13
7,588
21
2,635
1,515
1,741
272
38
304
1
10,943
2,506
1,234
3
2,420
14
1
48,622
SW
48
160
613
283
3,814
645
37
24
6
274
518
0
58
225
352
23
0
4
523
32
180
216
306
569
15
58
1
1,507
523
255
0
67
25
0
11,361
Percent of Samples
with Detections
Total
89.216%
49.067%
46.886%
0.000%
64.321%
72.384%
55.172%
29.167%
88.889%
94.589%
74.593%
97.656%
92.647%
87.097%
71.913%
93.310%
82.540%
70.588%
42.892%
100.000%
95.631%
82.727%
85.393%
32.105%
60.377%
77.348%
50.000%
45.944%
70.221%
99.328%
66.667%
86.691%
97.436%
0.000%
64.488%
GW
89.744%
47.442%
46.751%
0.000%
73.531%
74.427%
56.410%
0.000%
100.000%
94.733%
74.068%
97.656%
80.000%
90.390%
75.903%
93.716%
82.540%
69.231%
42.818%
100.000%
95.863%
84.158%
85.181%
26.838%
60.526%
76.316%
0.000%
44.339%
69.593%
99.433%
66.667%
86.529%
100.000%
0.000%
65.143%
SW
87.500%
51.250%
47.308%
0.000%
60.252%
67.132%
48.649%
29.167%
83.333%
93.796%
81.660%
0.000%
94.828%
82.222%
56.534%
73.913%
0.000%
75.000%
43.977%
100.000%
92.222%
72.685%
86.601%
34.622%
60.000%
82.759%
100.000%
57.598%
73.231%
98.824%
0.000%
92.537%
96.000%
0.000%
61.685%
Minimum Detect
Concentration (pCi/L)
Total
0.00001
0.003
0.1
0.01
0.04
0.38
2.8
2.3
0.01
1
0.1
1.1
0.1
1
0.62
1.2
0.79
0.02
0.09
0.1
0.02
0.02
1.03
1.84
0.51
12.2
3.7
0.3
0.2
0.12
0.03
0.5
0.00001
GW
0.00001
0.009
0.1
0.01
0.1
1.14
5.5
0.1
1
0.1
1.7
0.1
1
0.62
1.2
1.2
0.02
1.4
0.1
0.02
0.02
1.03
1.94
0.51
3.7
0.3
0.2
0.12
0.03
0.9
0.00001
SW
0.08
0.003
0.1
0.01
0.04
0.38
2.8
2.3
0.01
1
1.1
0.1
1
0.93
0.79
0.06
0.09
0.3
0.02
0.08
1.15
1.84
1.17
12.2
4
1
0.2
0.8
0.5
0.003
Median Detect
Concentration (pCi/L)
Total
2.7
2.8
2.3
3.74
5
5.785
4.7
4.7
5.7
11
2.2
2.9
5
5
5.2
2.95
2.85
5.21
3.5
5.3
5.9
3.4
5.595
4.3
3.375
12.2
7.2
3
3.6
0.91
3.5
2.05
5.2
GW
2.95
3.2
2.6
3.29
6
6.485
8.5
6
12
2.2
6.15
5.5
6
5.3
2.95
4
5.44
5.2
5.535
6
3.8
5.88
4.46
3.54
7.5
3
3.9
0.91
3.5
2.05
5.8
SW
1.6
2.35
1.9
4.02
3.2
1.27
4.7
2.9
3.9
4
2.8
4.29
3
2.6
2
2.44
2.75
2.8
4.5
2.2
5.53
3.2
2.5
12.2
6.2
4
2.2
7.35
2.1
4
90th Percentile Detect
Concentration (pCi/L)
Total
7.3
5
5
9
18
14.5
6.42
13.1
16.4
26
7.3
4.5
26
13
13.8
5.4
9.6
13.75
16
15.47
12.7
9.1
8.515
8.5
6.62
12.2
16.5
9
9
1.7
12
3.9
16.09
GW
7.5
5.3
5.5
8.4
20.02
16.3
13.1
17.7
26
7.3
54
27.1
13
13.9
5.4
11
14.23
16
15.92
13
9.4
10.4
9.59
7
17.1
9
9.4
1.7
12
3.7
17.8
SW
4.4
4.4
3.6
9.06
9
3.36
6.42
8.9
10.3
8
4.2
23
6
3.8
2.7
5.4
15
6.5
9.5
5.3
8.3
6.7
4.2
12.2
11.9
9
4.9
14
6.4
9.06
Maximum Detect
Concentration (pCi/L)
Total
10
29.1
18
488
310
272.3
6.42
13.1
183.1
92
17.1
54
140
72
34
22.8
11
340.5
136
86
102
228
20.7
13.2
186.49
12.2
120.5
66
50.7
1.7
106
8.7
488
GW
10
29.1
18
72
310
272.3
13.1
183.1
92
17.1
54
140
72
34
22.8
11
340.5
136
86
102
228
18.2
13.2
186.49
120.5
66
50.7
1.7
106
3.9
340.5
SW
5.7
7.67
12
488
180
7.42
6.42
8.9
26.9
13
7.9
54
60
5.5
2.7
11.8
103
43.8
16
28
20.7
6.7
10.85
12.2
74.1
31
9.9
21.3
8.7
488
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table Allb. Beta Particles — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
65
69
372
22
312
665
50
3
6
592
1,067
32
22
212
515
687
50
11
1,660
37
566
212
886
300
34
63
2
3,989
323
574
1
798
33
1
14,231
GW
47
44
310
14
179
473
44
0
3
545
977
32
3
140
458
664
50
7
1,534
16
533
195
739
181
26
55
1
3,662
292
480
1
786
13
1
12,505
SW
18
25
62
8
133
192
6
3
3
47
90
0
19
72
57
23
0
4
126
21
33
17
147
119
8
8
1
327
31
94
0
12
20
0
1,726
Total Population Served by Systems
Reporting
Total
41,281
1,643,459
2,125,964
2,687,913
22,507,285
4,902,486
1,354,974
281,400
486,665
1,000,626
5,275,541
81,650
1,836,280
6,370,032
4,891,537
3,655,448
10,302
81,975
6,726,126
3,704,577
1,613,612
909,274
4,698,625
7,721,824
170,477
885,694
142,862
24,786,365
2,162,558
3,916,167
88
3,233,657
368,173
27
120,274,924
GW
24,253
310,659
754,780
146,838
4,121,434
482,291
45,804
0
27,140
748,550
2,904,400
81,650
9,101
513,689
898,753
2,409,587
10,302
10,048
1,512,232
186,696
1,348,169
243,678
855,337
840,967
53,652
146,256
14,736
9,009,970
1,459,864
270,517
88
1,763,714
56,851
27
31,262,033
SW
17,028
1,332,800
1,371,184
2,541,075
18,385,851
4,420,195
1,309,170
281,400
459,525
252,076
2,371,141
0
1,827,179
5,856,343
3,992,784
1,245,861
0
71,927
5,213,894
3,517,881
265,443
665,596
3,843,288
6,880,857
116,825
739,438
128,126
15,776,395
702,694
3,645,650
0
1,469,943
311,322
0
89,012,891
Percent of Systems
with At Least One Detection
Total
86.154%
69.565%
94.086%
0.000%
88.141%
78.647%
88.000%
66.667%
100.000%
95.946%
61.949%
96.875%
90.909%
91.038%
84.660%
93.159%
88.000%
81.818%
71.265%
100.000%
98.763%
91.509%
82.619%
48.333%
61.765%
95.238%
50.000%
53.422%
84.520%
99.652%
100.000%
94.737%
100.000%
0.000%
74.513%
GW
85.106%
61.364%
93.548%
0.000%
86.034%
79.704%
90.909%
0.000%
100.000%
95.963%
59.365%
96.875%
66.667%
89.286%
84.061%
93.825%
88.000%
85.714%
69.492%
100.000%
98.687%
91.282%
82.003%
26.519%
57.692%
96.364%
0.000%
51.283%
86.301%
99.792%
100.000%
94.656%
100.000%
0.000%
72.971%
SW
88.889%
84.000%
96.774%
0.000%
90.977%
76.042%
66.667%
66.667%
100.000%
95.745%
90.000%
0.000%
94.737%
94.444%
89.474%
73.913%
0.000%
75.000%
92.857%
100.000%
100.000%
94.118%
85.714%
81.513%
75.000%
87.500%
100.000%
77.370%
67.742%
98.936%
0.000%
100.000%
100.000%
0.000%
85.689%
Percent of Population Served
with At Least One Detection
Total
72.498%
91.404%
93.811%
0.000%
91.788%
88.923%
71.394%
87.161%
100.000%
94.012%
81.286%
94.080%
97.675%
97.526%
99.264%
94.232%
86.197%
98.933%
91.244%
100.000%
99.936%
99.611%
61.883%
75.287%
94.376%
99.060%
89.685%
83.590%
95.945%
99.875%
100.000%
99.107%
100.000%
0.000%
86.861%
GW
66.969%
82.366%
86.594%
0.000%
81.824%
84.482%
89.453%
0.000%
100.000%
92.436%
73.105%
94.080%
46.511%
88.667%
97.989%
92.007%
86.197%
95.273%
77.199%
100.000%
99.924%
98.793%
93.099%
28.879%
95.849%
99.854%
0.000%
68.318%
96.380%
99.959%
100.000%
98.362%
100.000%
0.000%
80.112%
SW
80.374%
93.510%
97.784%
0.000%
94.021%
89.408%
70.762%
87.161%
100.000%
98.692%
91.307%
0.000%
97.930%
98.303%
99.551%
98.536%
0.000%
99.444%
95.318%
100.000%
100.000%
99.910%
54.936%
80.958%
93.700%
98.903%
100.000%
92.312%
95.042%
99.869%
0.000%
100.000%
100.000%
0.000%
89.231%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table Allc. Beta Particles — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 50 pCi/L
Total
0
0
0
0
4
6
2
0
0
4
6
0
1
5
2
0
0
0
13
2
7
1
3
0
0
1
0
14
1
1
0
2
0
0
75
GW
0
0
0
0
2
5
2
0
0
4
6
0
1
4
1
0
0
0
13
1
7
1
3
0
0
1
0
13
1
1
0
2
0
0
68
SW
0
0
0
0
2
1
0
0
0
0
0
0
0
1
1
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
7
Percent of Systems
with At Least One Detection
> 50 pCi/L
Total
0.000%
0.000%
0.000%
0.000%
1.282%
0.902%
4.000%
0.000%
0.000%
0.676%
0.562%
0.000%
4.545%
2.358%
0.388%
0.000%
0.000%
0.000%
0.783%
5.405%
1.237%
0.472%
0.339%
0.000%
0.000%
1.587%
0.000%
0.351%
0.310%
0.174%
0.000%
0.251%
0.000%
0.000%
0.527%
GW
0.000%
0.000%
0.000%
0.000%
1.117%
1.057%
4.545%
0.000%
0.000%
0.734%
0.614%
0.000%
33.333%
2.857%
0.218%
0.000%
0.000%
0.000%
0.847%
6.250%
1.313%
0.513%
0.406%
0.000%
0.000%
1.818%
0.000%
0.355%
0.342%
0.208%
0.000%
0.254%
0.000%
0.000%
0.544%
SW
0.000%
0.000%
0.000%
0.000%
1.504%
0.521%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.389%
1.754%
0.000%
0.000%
0.000%
0.000%
4.762%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.306%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.406%
Population Served by Systems
with At Least One Detection
> 50 pCi/L
Total
0
0
0
0
673,000
4,738
396
0
0
790
6,533
0
2,303
11,847
4,675
0
0
0
5,296
681,154
21,666
180
1,971
0
0
100
0
21,177
26,000
590
0
14,920
0
0
1,477,336
GW
0
0
0
0
433,500
4,038
396
0
0
790
6,533
0
2,303
1,414
675
0
0
0
5,296
4,900
21,666
180
1,971
0
0
100
0
15,577
26,000
590
0
14,920
0
0
540,849
SW
0
0
0
0
239,500
700
0
0
0
0
0
0
0
10,433
4,000
0
0
0
0
676,254
0
0
0
0
0
0
0
5,600
0
0
0
0
0
0
936,487
Percent of Population Served
with At Least One Detection
> 50 pCi/L
Total
0.000%
0.000%
0.000%
0.000%
2.990%
0.097%
0.029%
0.000%
0.000%
0.079%
0.124%
0.000%
0.125%
0.186%
0.096%
0.000%
0.000%
0.000%
0.079%
18.387%
1.343%
0.020%
0.042%
0.000%
0.000%
0.011%
0.000%
0.085%
1.202%
0.015%
0.000%
0.461%
0.000%
0.000%
1.228%
GW
0.000%
0.000%
0.000%
0.000%
10.518%
0.837%
0.865%
0.000%
0.000%
0.106%
0.225%
0.000%
25.305%
0.275%
0.075%
0.000%
0.000%
0.000%
0.350%
2.625%
1.607%
0.074%
0.230%
0.000%
0.000%
0.068%
0.000%
0.173%
1.781%
0.218%
0.000%
0.846%
0.000%
0.000%
1.730%
SW
0.000%
0.000%
0.000%
0.000%
1.303%
0.016%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.178%
0.100%
0.000%
0.000%
0.000%
0.000%
19.223%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.035%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.052%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table Alld. Beta Particles — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 25 pCi/L
Total
0
1
0
0
14
24
4
0
0
19
74
0
1
28
5
3
0
0
22
2
28
9
7
0
0
2
0
75
7
3
0
7
0
0
335
GW
0
1
0
0
3
19
4
0
0
18
74
0
1
21
3
3
0
0
22
1
27
9
6
0
0
2
0
72
6
3
0
7
0
0
302
SW
0
0
0
0
11
5
0
0
0
1
0
0
0
7
2
0
0
0
0
1
1
0
1
0
0
0
0
3
1
0
0
0
0
0
33
Percent of Systems
with At Least One Detection
> 25 pCi/L
Total
0.000%
1.449%
0.000%
0.000%
4.487%
3.609%
8.000%
0.000%
0.000%
3.209%
6.935%
0.000%
4.545%
13.208%
0.971%
0.437%
0.000%
0.000%
1.325%
5.405%
4.947%
4.245%
0.790%
0.000%
0.000%
3.175%
0.000%
1.880%
2.167%
0.523%
0.000%
0.877%
0.000%
0.000%
2.354%
GW
0.000%
2.273%
0.000%
0.000%
1.676%
4.017%
9.091%
0.000%
0.000%
3.303%
7.574%
0.000%
33.333%
15.000%
0.655%
0.452%
0.000%
0.000%
1.434%
6.250%
5.066%
4.615%
0.812%
0.000%
0.000%
3.636%
0.000%
1.966%
2.055%
0.625%
0.000%
0.891%
0.000%
0.000%
2.415%
SW
0.000%
0.000%
0.000%
0.000%
8.271%
2.604%
0.000%
0.000%
0.000%
2.128%
0.000%
0.000%
0.000%
9.722%
3.509%
0.000%
0.000%
0.000%
0.000%
4.762%
3.030%
0.000%
0.680%
0.000%
0.000%
0.000%
0.000%
0.917%
3.226%
0.000%
0.000%
0.000%
0.000%
0.000%
1.912%
Population Served by Systems
with At Least One Detection
> 25 pCi/L
Total
0
4,170
0
0
7,349,183
156,424
1,052
0
0
19,349
514,292
0
2,303
268,634
112,717
20,190
0
0
10,713
681,154
121,004
36,676
4,122
0
0
1,650
0
78,760
195,942
908
0
81,804
0
0
9,661,047
GW
0
4,170
0
0
473,415
29,763
1,052
0
0
18,740
514,292
0
2,303
144,200
4,150
20,190
0
0
10,713
4,900
120,771
36,676
2,522
0
0
1,650
0
70,825
119,902
908
0
81,804
0
0
1,662,946
SW
0
0
0
0
6,875,768
126,661
0
0
0
609
0
0
0
124,434
108,567
0
0
0
0
676,254
233
0
1,600
0
0
0
0
7,935
76,040
0
0
0
0
0
7,998,101
Percent of Population Served
with At Least One Detection
> 25 pCi/L
Total
0.000%
0.254%
0.000%
0.000%
32.652%
3.191%
0.078%
0.000%
0.000%
1.934%
9.749%
0.000%
0.125%
4.217%
2.304%
0.552%
0.000%
0.000%
0.159%
18.387%
7.499%
4.034%
0.088%
0.000%
0.000%
0.186%
0.000%
0.318%
9.061%
0.023%
0.000%
2.530%
0.000%
0.000%
8.032%
GW
0.000%
1.342%
0.000%
0.000%
11.487%
6.171%
2.297%
0.000%
0.000%
2.504%
17.707%
0.000%
25.305%
28.071%
0.462%
0.838%
0.000%
0.000%
0.708%
2.625%
8.958%
15.051%
0.295%
0.000%
0.000%
1.128%
0.000%
0.786%
8.213%
0.336%
0.000%
4.638%
0.000%
0.000%
5.319%
SW
0.000%
0.000%
0.000%
0.000%
37.397%
2.866%
0.000%
0.000%
0.000%
0.242%
0.000%
0.000%
0.000%
2.125%
2.719%
0.000%
0.000%
0.000%
0.000%
19.223%
0.088%
0.000%
0.042%
0.000%
0.000%
0.000%
0.000%
0.050%
10.821%
0.000%
0.000%
0.000%
0.000%
0.000%
8.985%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A12. Cadmium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold of
Interest
> 0.005 mg/L
> 0.0025 mg/L
> 0.005 mg/L
> 0.0025 mg/L
> 0.005 mg/L
> 0.0025 mg/L
Total # Systems
Reporting
44,928
44,928
3,992
3,992
48,920
48,920
# Systems Exceeding
Threshold of Interest
121
407
13
59
134
466
% Systems Exceeding
Threshold of Interest
0.269%
0.906%
0.326%
1.478%
0.274%
0.953%
Total Pop. Served by
Systems Reporting
85,335,776
85,335,776
144,349,594
144,349,594
229,685,370
229,685,370
Total Pop. Served by
Systems Exceeding
Threshold of Interest
497,363
1,710,771
1,901,706
4,288,872
2,399,069
5,999,643
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.583%
2.005%
1.317%
2.971%
1.045%
2.612%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A12a. Cadmium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
877
2,671
2,192
6,332
35,018
4,388
2,601
689
2,141
2,705
1,163
1,522
2,665
3,486
4,704
1,786
2,964
5,108
2,710
6,143
3,331
5,803
2,737
9,235
347
1,884
2,932
6,605
3,522
1,906
3,396
4,106
393
1,317
891
3,446
389
1,658
14,758
7,022
2,809
2,059
7,011
1,113
1,132
181,667
GW
619
1,814
1,538
4,951
20,753
2,328
1,878
641
2,072
2,382
1,101
1,259
2,390
3,072
4,222
550
1,995
3,991
2,311
5,969
3,282
5,028
2,449
7,794
303
1,798
2,767
5,885
3,196
1,332
2,541
3,460
330
953
660
2,982
360
486
12,178
5,477
2,199
1,735
6,840
422
877
141,170
SW
258
857
654
1,381
14,265
2,060
723
48
69
323
62
263
275
414
482
1,236
969
1,117
399
174
49
775
288
1,441
44
86
165
720
326
574
855
646
63
364
231
464
29
1,172
2,580
1,545
610
324
171
691
255
40,497
Percent of Samples
with Detections
Total
4.333%
0.824%
0.319%
1.453%
1.345%
3.624%
1.922%
9.144%
5.138%
0.074%
0.344%
0.526%
2.402%
5.192%
5.145%
5.375%
2.328%
1.018%
1.218%
8.888%
0.630%
2.171%
0.804%
1.841%
0.576%
0.000%
1.160%
1.862%
7.524%
0.892%
0.618%
1.120%
0.509%
0.607%
2.132%
5.775%
3.085%
5.006%
0.271%
1.438%
0.356%
0.729%
4.621%
2.516%
2.739%
2.217%
GW
4.200%
0.662%
0.390%
1.555%
1.648%
3.436%
1.491%
9.828%
5.309%
0.084%
0.272%
0.635%
2.636%
5.534%
5.471%
3.273%
2.406%
0.752%
1.385%
8.996%
0.609%
2.486%
0.735%
1.809%
0.660%
0.000%
1.193%
1.903%
7.697%
0.901%
0.590%
1.272%
0.606%
0.735%
0.909%
6.103%
3.333%
0.206%
0.255%
0.895%
0.409%
0.865%
4.678%
3.791%
3.079%
2.360%
SW
4.651%
1.167%
0.153%
1.086%
0.904%
3.835%
3.043%
0.000%
0.000%
0.000%
1.613%
0.000%
0.364%
2.657%
2.282%
6.311%
2.167%
1.970%
0.251%
5.172%
2.041%
0.129%
1.389%
2.012%
0.000%
0.000%
0.606%
1.528%
5.828%
0.871%
0.702%
0.310%
0.000%
0.275%
5.628%
3.664%
0.000%
6.997%
0.349%
3.366%
0.164%
0.000%
2.339%
1.737%
1.569%
1.721%
Minimum Detect
Concentration (mg/L)
Total
0.0001
0.0004
0.001
0.0001
6E-06
0.00003
0.0002
0.0001
0.0001
0.0032
0.0003
0.001
0.00001
0.00033
0.0001
0.00007
0.00004
0.00001
0.0005
0.00002
0.00051
0.001
0.0001
0.00005
0.00071
0.001
0.00003
0.0001
0.0002
0.00002
0.00017
0.003
0.00003
0.00002
0.0001
0.0002
0.0001
0.0002
0.001
0.002
0.00008
1.1E-05
9.7E-06
0.0005
6E-06
GW
0.0001
0.0004
0.001
0.0001
6E-06
0.00004
0.0002
0.0001
0.0001
0.0032
0.0003
0.001
0.00001
0.00033
0.0001
0.00007
0.0002
0.0005
0.0005
0.00002
0.00051
0.001
0.0001
0.00005
0.00071
0.001
0.0001
0.0001
0.0002
0.00002
0.00017
0.003
5.5E-05
0.00002
0.0001
0.0002
0.0013
0.0003
0.001
0.002
0.00008
1.1E-05
9.7E-06
0.0005
6E-06
SW
0.0001
0.0008
0.001
0.0001
7E-06
0.00003
0.0004
0.0004
0.0008
0.002
0.0001
0.0001
0.00004
0.00001
0.0005
0.0001
0.00083
0.00151
0.0002
0.00005
0.0016
0.00003
0.0001
0.001
0.0009
0.00026
0.00003
0.001
0.0001
0.0001
0.0002
0.001
0.002
0.00014
3.1E-05
0.0009
7E-06
Median Detect
Concentration (mg/L)
Total
0.00015
0.003
0.001
0.0014
0.001
0.0003
0.002
0.0004
0.0005
0.0065
0.0008
0.004
0.0007
0.004
0.0009
0.0002
0.001
0.001
0.0011
0.0001
0.0011
0.00316
0.001
0.001
0.00092
0.0016
0.001
0.0002
0.001
0.0017
0.00075
0.0055
0.00053
0.0017
0.0002
0.0009
0.0002
0.00154
0.002
0.002
0.001
0.00024
0.001
0.0019
0.00054
GW
0.00015
0.003
0.001
0.0015
0.001
0.0003
0.0021
0.0004
0.0005
0.0065
0.0012
0.004
0.0007
0.004
0.0009
0.00125
0.001
0.00105
0.0011
0.0001
0.00113
0.00317
0.001
0.001
0.00092
0.0016
0.0011
0.0002
0.001
0.002
0.00075
0.0055
0.00066
0.00215
0.0002
0.0009
0.0013
0.00158
0.002
0.002
0.001
0.00024
0.001
0.0019
0.0005
SW
0.00016
0.003
0.001
0.0013
0.00115
0.00029
0.002
0.0004
0.0008
0.0039
0.0003
0.0002
0.001
0.001
0.0005
0.0001
0.00083
0.00151
0.00055
0.001
0.0016
0.0005
0.0002
0.001
0.0012
0.00063
0.00003
0.0017
0.00018
0.0002
0.0013
0.002
0.002
0.00024
0.00018
0.00145
0.00085
90th Percentile Detect
Concentration (mg/L)
Total
0.00098
0.004
0.005
0.005
0.003
0.0012
0.005
0.0008
0.00115
0.0098
0.003
0.01
0.0021
0.007
0.0033
0.0025
0.002
0.0031
0.0032
0.0003
0.00377
0.01
0.002
0.002
0.00112
0.01
0.004
0.003
0.02
0.005
0.01
0.008
0.0032
0.0027
0.00065
0.0012
0.0007
0.00416
0.003
0.0165
0.002
0.00087
0.001
0.0033
0.0035
GW
0.00098
0.004
0.005
0.0055
0.003
0.0009
0.0074
0.0008
0.00115
0.0098
0.003
0.01
0.0021
0.00705
0.0033
0.003
0.002
0.0038
0.0032
0.0003
0.00439
0.01
0.004
0.002
0.00112
0.01
0.004
0.003
0.02
0.005
0.01
0.008
0.0032
0.0026
0.00065
0.0012
0.0013
0.0041
0.003
0.03
0.002
0.00086
0.001
0.0033
0.004
SW
0.00091
0.0045
0.001
0.0041
0.003
0.0022
0.002
0.0004
0.0008
0.007
0.0011
0.002
0.0011
0.003
0.0005
0.0002
0.00083
0.00151
0.001
0.002
0.0016
0.003
0.0011
0.002
0.003
0.001
0.00003
0.0027
0.0004
0.00069
0.005
0.003
0.002
0.0011
0.0013
0.0038
0.003
Maximum Detect
Concentration (mg/L)
Total
0.00264
0.005
0.005
0.05
0.04
0.0081
0.02
0.0021
0.0046
0.0098
0.003
0.01
0.007
0.04
0.005
0.05
0.01
0.008
0.0076
0.01
0.03
0.03
0.01
0.02
0.00112
0.03
0.03
0.04
0.04
0.0095
0.01
0.008
0.0032
0.0042
0.003
0.0018
0.003
0.01
0.02
0.03
0.003
0.08
0.0025
0.01
0.08
GW
0.00135
0.004
0.005
0.05
0.02
0.0013
0.02
0.0021
0.0046
0.0098
0.003
0.01
0.007
0.04
0.005
0.0032
0.01
0.008
0.0076
0.01
0.03
0.03
0.01
0.007
0.00112
0.03
0.03
0.04
0.04
0.0095
0.01
0.008
0.0032
0.0026
0.0026
0.0018
0.0013
0.01
0.02
0.03
0.003
0.08
0.001
0.01
0.08
SW
0.00264
0.005
0.001
0.005
0.04
0.0081
0.009
0.0004
0.0008
0.007
0.0017
0.05
0.006
0.0032
0.0005
0.0002
0.00083
0.00151
0.001
0.02
0.0016
0.007
0.0033
0.002
0.003
0.001
0.00003
0.0042
0.003
0.003
0.005
0.005
0.002
0.0011
0.0025
0.0038
0.05
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A12b. Cadmium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
496
352
453
1,050
3,819
838
1,170
281
1,334
1,593
107
966
896
1,489
1,623
242
675
1,038
807
2,996
1,459
1,421
843
2,283
217
731
1,216
1,374
724
325
1,567
1,917
182
732
143
823
235
350
4,888
507
1,582
598
1,823
451
304
48,920
GW
394
279
381
1,002
3,296
617
1,131
278
1,308
1,479
95
933
848
1,386
1,574
93
557
970
753
2,944
1,432
1,344
784
2,144
190
720
1,175
1,337
685
305
1,327
1,792
166
610
134
758
224
161
4,547
457
1,414
556
1,803
290
255
44,928
SW
102
73
72
48
523
221
39
3
26
114
12
33
48
103
49
149
118
68
54
52
27
77
59
139
27
11
41
37
39
20
240
125
16
122
9
65
11
189
341
50
168
42
20
161
49
3,992
Total Population Served by Systems
Reporting
Total
551,465
4,701,100
2,452,800
6,162,056
36,244,015
4,998,506
2,716,176
679,823
17,251,146
7,242,523
1,303,767
2,500,215
1,048,836
9,168,084
4,980,057
4,602,489
8,525,540
5,022,488
727,775
6,681,711
3,959,159
3,006,743
757,031
6,973,518
563,069
1,449,290
942,517
7,762,423
1,667,433
970,653
11,199,594
10,218,949
679,606
2,776,564
913,584
3,468,333
328,972
5,683,572
25,060,220
2,543,652
4,803,450
490,389
4,044,416
1,415,477
446,184
229,685,370
GW
211,445
1,463,066
909,774
2,791,465
13,414,446
533,275
382,254
398,423
15,005,104
1,350,192
1,249,139
1,391,589
805,867
2,968,012
2,619,602
375,460
1,718,116
1,024,381
292,171
1,889,380
2,725,622
1,692,282
364,632
1,708,352
257,844
672,810
392,718
2,726,477
1,400,885
280,854
1,220,151
3,124,012
268,651
486,818
173,606
809,806
237,011
1,460,816
9,275,719
1,686,017
634,384
226,621
2,352,672
234,687
129,168
85,335,776
SW
340,020
3,238,034
1,543,026
3,370,591
22,829,569
4,465,231
2,333,922
281,400
2,246,042
5,892,331
54,628
1,108,626
242,969
6,200,072
2,360,455
4,227,029
6,807,424
3,998,107
435,604
4,792,331
1,233,537
1,314,461
392,399
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,799
9,979,443
7,094,937
410,955
2,289,746
739,978
2,658,527
91,961
4,222,756
15,784,501
857,635
4,169,066
263,768
1,691,744
1,180,790
317,016
144,349,594
Percent of Systems
with At Least One Detection
Total
7.056%
4.830%
1.545%
4.857%
5.918%
12.411%
2.821%
13.879%
6.522%
0.126%
2.804%
0.828%
5.134%
10.477%
13.124%
20.661%
6.519%
2.890%
1.983%
15.621%
1.097%
2.111%
1.423%
6.351%
0.922%
0.000%
2.385%
7.205%
19.475%
3.692%
1.276%
2.295%
1.099%
0.956%
4.895%
15.796%
3.404%
2.857%
0.818%
3.156%
0.506%
2.341%
14.536%
5.322%
8.553%
5.605%
GW
6.091%
2.867%
1.575%
4.491%
4.945%
10.049%
2.299%
14.029%
6.651%
0.135%
2.105%
0.857%
5.307%
10.534%
13.024%
13.978%
5.566%
2.577%
1.992%
15.659%
1.047%
2.158%
1.276%
5.737%
1.053%
0.000%
2.383%
6.806%
19.562%
3.607%
1.055%
2.344%
1.205%
0.984%
2.985%
15.831%
3.571%
0.621%
0.682%
2.845%
0.495%
2.518%
14.531%
5.517%
8.627%
5.382%
SW
10.784%
12.329%
1.389%
12.500%
12.046%
19.005%
17.949%
0.000%
0.000%
0.000%
8.333%
0.000%
2.083%
9.709%
16.327%
24.832%
11.017%
7.353%
1.852%
13.462%
3.704%
1.299%
3.390%
15.827%
0.000%
0.000%
2.439%
21.622%
17.949%
5.000%
2.500%
1.600%
0.000%
0.820%
33.333%
15.385%
0.000%
4.762%
2.639%
6.000%
0.595%
0.000%
15.000%
4.969%
8.163%
8.116%
Percent of Population Served
with At Least One Detection
Total
1.836%
10.857%
1.118%
52.470%
21.099%
51.863%
25.753%
18.419%
25.960%
2.272%
2.380%
0.207%
26.538%
7.846%
14.809%
40.978%
48.204%
35.767%
4.137%
13.198%
3.666%
2.557%
13.913%
20.315%
0.051%
0.000%
1.818%
27.478%
52.338%
7.279%
0.326%
2.425%
0.795%
0.063%
18.447%
14.657%
3.988%
15.139%
4.407%
13.432%
0.129%
0.568%
18.504%
1.922%
9.337%
16.943%
GW
3.385%
3.178%
2.861%
34.921%
15.545%
9.364%
6.327%
31.429%
29.845%
12.188%
2.466%
0.372%
11.458%
16.578%
14.486%
40.734%
5.674%
4.058%
9.647%
23.736%
5.272%
3.785%
20.319%
9.757%
0.111%
0.000%
1.499%
11.501%
53.086%
5.039%
0.701%
0.714%
2.010%
0.188%
26.548%
21.843%
5.535%
2.791%
0.431%
0.865%
0.574%
1.230%
26.390%
1.475%
6.561%
14.395%
SW
0.873%
14.327%
0.091%
67.004%
24.363%
56.939%
28.935%
0.000%
0.000%
0.000%
0.403%
0.000%
76.553%
3.667%
15.168%
41.000%
58.937%
43.892%
0.441%
9.044%
0.118%
0.976%
7.961%
23.741%
0.000%
0.000%
2.046%
36.127%
48.406%
8.191%
0.280%
3.179%
0.000%
0.036%
16.547%
12.468%
0.000%
19.411%
6.743%
38.137%
0.061%
0.000%
7.538%
2.010%
10.468%
18.449%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A12c. Cadmium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.005 mg/L
Total
0
0
0
6
19
1
4
0
0
1
0
1
2
44
0
1
2
2
1
2
1
4
1
5
0
0
7
9
6
2
1
4
1
0
0
0
0
0
2
2
1
0
1
0
1
134
GW
0
0
0
6
14
0
3
0
0
1
0
1
2
42
0
0
1
2
1
2
1
4
1
4
0
0
7
8
6
2
1
4
1
0
0
0
0
0
2
2
1
0
1
0
1
121
SW
0
0
0
0
5
1
1
0
0
0
0
0
0
2
0
1
1
0
0
0
0
0
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
13
Percent of Systems
with At Least One Detection
> 0.005 mg/L
Total
0.000%
0.000%
0.000%
0.571%
0.498%
0.119%
0.342%
0.000%
0.000%
0.063%
0.000%
0.104%
0.223%
2.955%
0.000%
0.413%
0.296%
0.193%
0.124%
0.067%
0.069%
0.281%
0.119%
0.219%
0.000%
0.000%
0.576%
0.655%
0.829%
0.615%
0.064%
0.209%
0.549%
0.000%
0.000%
0.000%
0.000%
0.000%
0.041%
0.394%
0.063%
0.000%
0.055%
0.000%
0.329%
0.274%
GW
0.000%
0.000%
0.000%
0.599%
0.425%
0.000%
0.265%
0.000%
0.000%
0.068%
0.000%
0.107%
0.236%
3.030%
0.000%
0.000%
0.180%
0.206%
0.133%
0.068%
0.070%
0.298%
0.128%
0.187%
0.000%
0.000%
0.596%
0.598%
0.876%
0.656%
0.075%
0.223%
0.602%
0.000%
0.000%
0.000%
0.000%
0.000%
0.044%
0.438%
0.071%
0.000%
0.055%
0.000%
0.392%
0.269%
SW
0.000%
0.000%
0.000%
0.000%
0.956%
0.452%
2.564%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.942%
0.000%
0.671%
0.847%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.719%
0.000%
0.000%
0.000%
2.703%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.326%
Population Served by Systems
with At Least One Detection
> 0.005 mg/L
Total
0
0
0
3,636
150,119
6,000
23,163
0
0
163,688
0
510
46,830
231,041
0
886,428
43,585
260
15,000
215
753
7,998
25
724,060
0
0
2,378
78,418
3,313
4,243
50
1,675
500
0
0
0
0
0
645
3,450
620
0
86
0
380
2,399,069
GW
0
0
0
3,636
43,716
0
1,183
0
0
163,688
0
510
46,830
127,561
0
0
85
260
15,000
215
753
7,998
25
1,114
0
0
2,378
67,449
3,313
4,243
50
1,675
500
0
0
0
0
0
645
3,450
620
0
86
0
380
497,363
SW
0
0
0
0
106,403
6,000
21,980
0
0
0
0
0
0
103,480
0
886,428
43,500
0
0
0
0
0
0
722,946
0
0
0
10,969
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1,901,706
Percent of Population Served
with At Least One Detection
> 0.005 mg/L
Total
0.000%
0.000%
0.000%
0.059%
0.414%
0.120%
0.853%
0.000%
0.000%
2.260%
0.000%
0.020%
4.465%
2.520%
0.000%
19.260%
0.511%
0.005%
2.061%
0.003%
0.019%
0.266%
0.003%
10.383%
0.000%
0.000%
0.252%
1.010%
0.199%
0.437%
0.000%
0.016%
0.074%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.136%
0.013%
0.000%
0.002%
0.000%
0.085%
1.045%
GW
0.000%
0.000%
0.000%
0.130%
0.326%
0.000%
0.309%
0.000%
0.000%
12.123%
0.000%
0.037%
5.811%
4.298%
0.000%
0.000%
0.005%
0.025%
5.134%
0.011%
0.028%
0.473%
0.007%
0.065%
0.000%
0.000%
0.606%
2.474%
0.236%
1.511%
0.004%
0.054%
0.186%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
0.205%
0.098%
0.000%
0.004%
0.000%
0.294%
0.583%
SW
0.000%
0.000%
0.000%
0.000%
0.466%
0.134%
0.942%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.669%
0.000%
20.970%
0.639%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
13.731%
0.000%
0.000%
0.000%
0.218%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.317%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A12d. Cadmium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.0025 mg/L
Total
1
14
1
11
63
4
14
0
4
2
1
6
4
142
45
7
6
9
3
5
3
7
2
12
0
0
8
25
13
3
5
6
2
1
4
3
0
1
9
6
2
1
5
1
5
466
GW
0
6
1
9
51
0
13
0
4
2
1
6
4
133
45
4
4
7
3
5
3
7
2
10
0
0
8
23
12
3
4
6
2
1
2
2
0
0
8
4
2
1
5
0
4
407
SW
1
8
0
2
12
4
1
0
0
0
0
0
0
9
0
3
2
2
0
0
0
0
0
2
0
0
0
2
1
0
1
0
0
0
2
1
0
1
1
2
0
0
0
1
1
59
Percent of Systems
with At Least One Detection
> 0.0025 mg/L
Total
0.202%
3.977%
0.221%
1.048%
1.650%
0.477%
1.197%
0.000%
0.300%
0.126%
0.935%
0.621%
0.446%
9.537%
2.773%
2.893%
0.889%
0.867%
0.372%
0.167%
0.206%
0.493%
0.237%
0.526%
0.000%
0.000%
0.658%
1.820%
1.796%
0.923%
0.319%
0.313%
1.099%
0.137%
2.797%
0.365%
0.000%
0.286%
0.184%
1.183%
0.126%
0.167%
0.274%
0.222%
1.645%
0.953%
GW
0.000%
2.151%
0.262%
0.898%
1.547%
0.000%
1.149%
0.000%
0.306%
0.135%
1.053%
0.643%
0.472%
9.596%
2.859%
4.301%
0.718%
0.722%
0.398%
0.170%
0.209%
0.521%
0.255%
0.466%
0.000%
0.000%
0.681%
1.720%
1.752%
0.984%
0.301%
0.335%
1.205%
0.164%
1.493%
0.264%
0.000%
0.000%
0.176%
0.875%
0.141%
0.180%
0.277%
0.000%
1.569%
0.906%
SW
0.980%
10.959%
0.000%
4.167%
2.294%
1.810%
2.564%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
8.738%
0.000%
2.013%
1.695%
2.941%
0.000%
0.000%
0.000%
0.000%
0.000%
1.439%
0.000%
0.000%
0.000%
5.405%
2.564%
0.000%
0.417%
0.000%
0.000%
0.000%
22.222%
1.538%
0.000%
0.529%
0.293%
4.000%
0.000%
0.000%
0.000%
0.621%
2.041%
1.478%
Population Served by Systems
with At Least One Detection
> 0.0025 mg/L
Total
50
449,712
3,868
443,422
1,203,652
97,245
25,314
0
84,760
164,565
29,183
1,999
62,279
711,278
97,122
920,164
68,639
47,595
15,435
511
1,743
11,268
310
823,916
0
0
2,431
111,683
77,071
4,523
2,499
1,853
5,400
125
160,952
8,726
0
25,379
2,321
324,475
746
300
471
1,800
4,858
5,999,643
GW
0
24,863
3,868
18,922
480,044
0
3,334
0
84,760
164,565
29,183
1,999
62,279
486,439
97,122
19,201
475
16,096
15,435
511
1,743
11,268
310
22,763
0
0
2,431
84,885
4,370
4,523
2,167
1,853
5,400
125
41,689
5,737
0
0
2,189
3,925
746
300
471
0
4,780
1,710,771
SW
50
424,849
0
424,500
723,608
97,245
21,980
0
0
0
0
0
0
224,839
0
900,963
68,164
31,499
0
0
0
0
0
801,153
0
0
0
26,798
72,701
0
332
0
0
0
119,263
2,989
0
25,379
132
320,550
0
0
0
1,800
78
4,288,872
Percent of Population Served
with At Least One Detection
> 0.0025 mg/L
Total
0.009%
9.566%
0.158%
7.196%
3.321%
1.945%
0.932%
0.000%
0.491%
2.272%
2.238%
0.080%
5.938%
7.758%
1.950%
19.993%
0.805%
0.948%
2.121%
0.008%
0.044%
0.375%
0.041%
11.815%
0.000%
0.000%
0.258%
1.439%
4.622%
0.466%
0.022%
0.018%
0.795%
0.005%
17.618%
0.252%
0.000%
0.447%
0.009%
12.756%
0.016%
0.061%
0.012%
0.127%
1.089%
2.612%
GW
0.000%
1.699%
0.425%
0.678%
3.579%
0.000%
0.872%
0.000%
0.565%
12.188%
2.336%
0.144%
7.728%
16.389%
3.708%
5.114%
0.028%
1.571%
5.283%
0.027%
0.064%
0.666%
0.085%
1.332%
0.000%
0.000%
0.619%
3.113%
0.312%
1.610%
0.178%
0.059%
2.010%
0.026%
24.014%
0.708%
0.000%
0.000%
0.024%
0.233%
0.118%
0.132%
0.020%
0.000%
3.701%
2.005%
SW
0.015%
13.121%
0.000%
12.594%
3.170%
2.178%
0.942%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.626%
0.000%
21.314%
1.001%
0.788%
0.000%
0.000%
0.000%
0.000%
0.000%
15.216%
0.000%
0.000%
0.000%
0.532%
27.275%
0.000%
0.003%
0.000%
0.000%
0.000%
16.117%
0.112%
0.000%
0.601%
0.001%
37.376%
0.000%
0.000%
0.000%
0.152%
0.025%
2.971%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A13. Carbofuran —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of 1 nterest
> 40 u.g/L
> 20 ug/L
> 7 ug/L
> 0.9 ug/L
> 40 u.g/L
> 20 ug/L
> 7 ug/L
> 0.9 ug/L
> 40 u.g/L
> 20 ug/L
> 7 ug/L
> 0.9 ug/L
Total # Systems
Reporting
28,289
28,289
28,289
28,289
2,808
2,808
2,808
2,808
31,097
31,097
31,097
31,097
# Systems Exceeding
Threshold of Interest
0
0
0
7
0
0
1
2
0
0
1
9
% Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.025%
0.000%
0.000%
0.036%
0.071%
0.000%
0.000%
0.003%
0.029%
Total Pop. Served by
Systems Reporting
61,793,025
61,793,025
61,793,025
61,793,025
106,180,317
106,180,317
106,180,317
106,180,317
167,973,342
167,973,342
167,973,342
167,973,342
Total Pop. Served by
Systems Exceeding
Threshold of Interest
0
0
0
71,762
0
0
3,186
257,648
0
0
3,186
329,410
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.116%
0.000%
0.000%
0.003%
0.243%
0.000%
0.000%
0.002%
0.196%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A13a. Carbofuran —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
32
503
1,544
6,354
11,955
2,390
1,324
1,248
2,357
1,428
1,694
48
1,171
3,815
2,243
1,764
2,909
2,362
357
6,596
4,577
4,611
2,850
12,779
59
2,345
4,193
158
4,258
1,531
2,879
531
5
2,056
471
2,996
898
155
829
7,110
416
1,287
3,162
640
1,252
114,142
GW
14
374
1,318
4,914
6,800
1,718
1,013
1,218
2,292
1,355
1,646
31
959
3,411
2,083
444
2,145
1,635
300
6,329
4,443
4,041
2,582
11,736
41
2,279
3,874
145
4,009
1,140
2,168
381
5
1,573
316
2,623
787
31
706
5,922
154
1,097
3,070
334
939
94,395
SW
18
129
226
1,440
5,155
672
311
30
65
73
48
17
212
404
160
1,320
764
727
57
267
134
570
268
1,043
18
66
319
13
249
391
711
150
0
483
155
373
111
124
123
1,188
262
190
92
306
313
19,747
Percent of Samples
with Detections
Total
0.000%
0.000%
0.000%
0.094%
0.000%
0.000%
0.000%
0.481%
0.552%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.454%
0.103%
0.212%
0.000%
0.000%
0.000%
0.022%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.023%
0.000%
0.069%
0.000%
0.000%
0.000%
0.000%
0.033%
0.000%
0.000%
0.000%
0.000%
0.000%
0.311%
0.000%
1.719%
0.000%
0.053%
GW
0.000%
0.000%
0.000%
0.102%
0.000%
0.000%
0.000%
0.493%
0.567%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.093%
0.000%
0.000%
0.000%
0.000%
0.025%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.025%
0.000%
0.092%
0.000%
0.000%
0.000%
0.000%
0.038%
0.000%
0.000%
0.000%
0.000%
0.000%
0.365%
0.000%
2.096%
0.000%
0.044%
SW
0.000%
0.000%
0.000%
0.069%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.606%
0.131%
0.688%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.307%
0.000%
0.096%
Minimum Detect
Concentration (u.g/L)
Total
0.5
0.54
0.23
0.7
0.9
0.9
1.05
3
0.5
1.03
0.5
0.5
0.23
GW
0.5
0.54
0.23
0.9
1.05
3
0.5
1.03
0.5
0.54
0.23
SW
0.5
0.7
0.9
0.9
0.5
0.5
Median Detect
Concentration (u.g/L)
Total
0.5
0.54
0.5
0.9
0.9
0.9
1.05
3
0.75
1.03
0.5
0.73
0.54
GW
0.5
0.54
0.5
0.9
1.05
3
0.75
1.03
0.5
0.54
0.54
SW
0.5
0.9
0.9
0.9
0.73
0.9
90th Percentile Detect
Concentration (u.g/L)
Total
2
0.54
1
2.5
0.9
0.9
1.05
3
1
1.03
0.5
0.73
1.05
GW
2
0.54
1
0.9
1.05
3
1
1.03
0.5
0.73
1
SW
0.5
2.5
0.9
0.9
8
2.5
Maximum Detect
Concentration (u.g/L)
Total
2
0.54
1
2.5
0.9
0.9
1.05
3
1
1.03
0.5
8
8
GW
2
0.54
1
0.9
1.05
3
1
1.03
0.5
0.73
3
SW
0.5
2.5
0.9
0.9
8
8
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A13b. Carbofuran — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
8
171
454
912
1,372
797
653
238
1,309
296
110
4
489
1,365
1,403
242
644
856
208
2,926
1,282
1,461
812
2,365
28
712
1,237
128
696
291
1,345
269
3
1,084
72
778
259
63
669
426
174
438
1,405
339
304
31,097
GW
6
126
382
864
1,104
580
616
235
1,288
283
98
3
463
1,261
1,359
93
527
790
185
2,865
1,253
1,385
752
2,228
22
701
1,196
118
660
270
1,114
190
3
934
63
719
238
16
606
389
65
404
1,385
194
256
28,289
SW
2
45
72
48
268
217
37
3
21
13
12
1
26
104
44
149
117
66
23
61
29
76
60
137
6
11
41
10
36
21
231
79
0
150
9
59
21
47
63
37
109
34
20
145
48
2,808
Total Population Served by Systems
Reporting
Total
22,575
2,702,037
2,453,348
6,035,739
32,726,875
4,978,181
2,588,367
650,290
16,785,698
994,603
1,300,849
162,197
856,983
9,183,137
4,870,706
4,602,489
8,509,572
4,901,793
471,954
7,226,429
3,931,466
2,643,059
753,305
6,885,177
47,665
1,453,178
945,754
1,906,326
1,663,162
960,557
4,923,641
6,465,862
905
2,937,354
894,778
3,428,914
621,074
1,748,866
2,803,106
2,500,671
2,312,591
432,235
3,883,163
1,360,534
446,177
167,973,342
GW
13,611
589,449
910,322
2,665,148
11,163,398
511,547
261,100
368,890
14,546,522
305,252
1,246,221
27,580
639,201
2,982,740
2,550,970
375,460
1,707,190
906,003
108,050
2,046,573
2,681,825
1,698,598
360,636
1,733,551
40,636
676,698
395,955
343,608
1,400,264
270,666
980,364
483,522
905
572,604
154,800
802,131
261,903
175,699
435,220
1,667,485
26,001
180,711
2,191,419
203,368
129,229
61,793,025
SW
8,964
2,112,588
1,543,026
3,370,591
21,563,477
4,466,634
2,327,267
281,400
2,239,176
689,351
54,628
134,617
217,782
6,200,397
2,319,736
4,227,029
6,802,382
3,995,790
363,904
5,179,856
1,249,641
944,461
392,669
5,151,626
7,029
776,480
549,799
1,562,718
262,898
689,891
3,943,277
5,982,340
0
2,364,750
739,978
2,626,783
359,171
1,573,167
2,367,886
833,186
2,286,590
251,524
1,691,744
1,157,166
316,948
106,180,317
Percent of Systems
with At Least One Detection
Total
0.000%
0.000%
0.000%
0.329%
0.000%
0.000%
0.000%
2.521%
0.611%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.479%
0.466%
0.117%
0.000%
0.000%
0.000%
0.068%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.144%
0.000%
0.149%
0.000%
0.000%
0.000%
0.000%
0.129%
0.000%
0.000%
0.000%
0.000%
0.000%
0.913%
0.000%
2.655%
0.000%
0.145%
GW
0.000%
0.000%
0.000%
0.231%
0.000%
0.000%
0.000%
2.553%
0.621%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.380%
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.152%
0.000%
0.180%
0.000%
0.000%
0.000%
0.000%
0.139%
0.000%
0.000%
0.000%
0.000%
0.000%
0.990%
0.000%
3.608%
0.000%
0.120%
SW
0.000%
0.000%
0.000%
2.083%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.027%
0.855%
1.515%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.379%
0.000%
0.392%
Percent of Population Served
with At Least One Detection
Total
0.000%
0.000%
0.000%
5.892%
0.000%
0.000%
0.000%
1.032%
18.378%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
7.771%
0.475%
34.885%
0.000%
0.000%
0.000%
0.023%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.013%
0.000%
0.066%
0.000%
0.000%
0.000%
0.000%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.148%
0.000%
0.652%
0.000%
3.315%
GW
0.000%
0.000%
0.000%
2.088%
0.000%
0.000%
0.000%
1.819%
21.207%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.833%
0.000%
0.000%
0.000%
0.000%
0.035%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.016%
0.000%
0.332%
0.000%
0.000%
0.000%
0.000%
0.010%
0.000%
0.000%
0.000%
0.000%
0.000%
0.354%
0.000%
0.643%
0.000%
5.154%
SW
0.000%
0.000%
0.000%
8.901%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
8.461%
0.134%
42.795%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.653%
0.000%
2.246%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A13c. Carbofuran —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 40 u.g/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 40 u.g/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 40 u.g/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 40 u.g/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A13d. Carbofuran — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 20 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 20 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 20 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 20 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A13e. Carbofuran — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 7 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
Percent of Systems
with At Least One Detection
> 7 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.295%
0.000%
0.003%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.690%
0.000%
0.036%
Population Served by Systems
with At Least One Detection
> 7 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3,186
0
3,186
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3,186
0
3,186
Percent of Population Served
with At Least One Detection
> 7 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.234%
0.000%
0.002%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.275%
0.000%
0.003%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A13f. Carbofuran — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.9 ug/L
Total
0
0
0
1
0
0
0
0
2
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
0
1
0
1
0
0
0
0
1
0
0
0
0
0
0
0
1
0
9
GW
0
0
0
1
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
1
0
0
0
0
1
0
0
0
0
0
0
0
0
0
7
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
2
Percent of Systems
with At Least One Detection
> 0.9 ug/L
Total
0.000%
0.000%
0.000%
0.110%
0.000%
0.000%
0.000%
0.000%
0.153%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.413%
0.000%
0.000%
0.000%
0.000%
0.000%
0.068%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.144%
0.000%
0.074%
0.000%
0.000%
0.000%
0.000%
0.129%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.295%
0.000%
0.029%
GW
0.000%
0.000%
0.000%
0.116%
0.000%
0.000%
0.000%
0.000%
0.155%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.152%
0.000%
0.090%
0.000%
0.000%
0.000%
0.000%
0.139%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.025%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.690%
0.000%
0.071%
Population Served by Systems
with At Least One Detection
> 0.9 ug/L
Total
0
0
0
5,005
0
0
0
0
62,906
0
0
0
0
0
0
254,462
0
0
0
0
0
603
0
0
0
0
0
0
220
0
2,950
0
0
0
0
78
0
0
0
0
0
0
0
3,186
0
329,410
GW
0
0
0
5,005
0
0
0
0
62,906
0
0
0
0
0
0
0
0
0
0
0
0
603
0
0
0
0
0
0
220
0
2,950
0
0
0
0
78
0
0
0
0
0
0
0
0
0
71,762
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
254,462
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3,186
0
257,648
Percent of Population Served
with At Least One Detection
> 0.9 ug/L
Total
0.000%
0.000%
0.000%
0.083%
0.000%
0.000%
0.000%
0.000%
0.375%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.529%
0.000%
0.000%
0.000%
0.000%
0.000%
0.023%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.013%
0.000%
0.060%
0.000%
0.000%
0.000%
0.000%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.234%
0.000%
0.196%
GW
0.000%
0.000%
0.000%
0.188%
0.000%
0.000%
0.000%
0.000%
0.432%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.035%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.016%
0.000%
0.301%
0.000%
0.000%
0.000%
0.000%
0.010%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.116%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.020%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.275%
0.000%
0.243%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A14. Carbon tetrachloride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of 1 nterest
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
Total # Systems
Reporting
46,190
46,190
46,190
46,190
4,256
4,256
4,256
4,256
50,446
50,446
50,446
50,446
# Systems Exceeding
Threshold of Interest
49
81
179
312
8
25
82
147
57
106
261
459
% Systems Exceeding
Threshold of Interest
0.106%
0.175%
0.388%
0.675%
0.188%
0.587%
1.927%
3.454%
0.113%
0.210%
0.517%
0.910%
Total Pop. Served by
Systems Reporting
86,397,574
86,397,574
86,397,574
86,397,574
140,537,213
140,537,213
140,537,213
140,537,213
226,934,787
226,934,787
226,934,787
226,934,787
Total Pop. Served by
Systems Exceeding
Threshold of Interest
146,334
313,180
1,010,901
1,813,677
4,821,230
5,174,513
7,071,752
12,609,728
4,967,564
5,487,693
8,082,653
14,423,405
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.169%
0.362%
1.170%
2.099%
3.431%
3.682%
5.032%
8.973%
2.189%
2.418%
3.562%
6.356%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A14a. Carbon tetrachloride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,108
834
2,394
11,687
98,417
2,875
6,938
1,047
4,178
7,175
1,791
1,819
3,765
7,100
4,621
3,322
16,249
6,773
3,698
10,754
8,585
7,543
4,495
19,065
534
6,842
9,582
20,356
6,572
3,211
7,073
8,845
5,635
2,324
1,959
4,342
889
2,945
34,154
8,988
4,930
4,349
11,294
1,146
1,661
385,864
GW
1,970
601
1,926
9,519
51,662
2,135
6,047
1,017
4,108
6,348
1,688
1,695
3,304
6,492
4,311
1,126
12,259
5,511
3,383
9,744
7,336
6,694
3,956
17,486
407
6,265
9,104
18,570
6,096
2,579
5,406
7,686
4,200
1,682
1,591
3,803
855
1,165
27,046
7,557
4,057
3,956
11,169
444
1,156
295,112
SW
1,138
233
468
2,168
46,755
740
891
30
70
827
103
124
461
608
310
2,196
3,990
1,262
315
1,010
1,249
849
539
1,579
127
577
478
1,786
476
632
1,667
1,159
1,435
642
368
539
34
1,780
7,108
1,431
873
393
125
702
505
90,752
Percent of Samples
with Detections
Total
0.161%
2.398%
2.966%
0.086%
3.621%
0.348%
0.101%
0.000%
0.646%
0.251%
6.142%
0.935%
0.452%
0.507%
0.130%
1.475%
0.043%
0.325%
0.162%
0.130%
1.142%
0.186%
0.111%
0.257%
0.187%
1.725%
0.031%
0.447%
0.228%
0.280%
0.240%
0.215%
0.497%
0.043%
0.255%
0.322%
0.000%
0.374%
0.351%
0.022%
0.081%
0.207%
0.159%
2.182%
0.843%
1.220%
GW
0.152%
0.832%
2.908%
0.053%
3.004%
0.234%
0.066%
0.000%
0.657%
0.205%
5.746%
0.885%
0.484%
0.447%
0.116%
0.178%
0.041%
0.236%
0.177%
0.041%
0.913%
0.105%
0.101%
0.223%
0.000%
1.868%
0.022%
0.458%
0.213%
0.310%
0.259%
0.156%
0.548%
0.059%
0.126%
0.210%
0.000%
0.343%
0.311%
0.026%
0.074%
0.177%
0.143%
3.153%
1.038%
0.815%
SW
0.176%
6.438%
3.205%
0.231%
4.303%
0.676%
0.337%
0.000%
0.000%
0.605%
12.621%
1.613%
0.217%
1.151%
0.323%
2.140%
0.050%
0.713%
0.000%
0.990%
2.482%
0.824%
0.186%
0.633%
0.787%
0.173%
0.209%
0.336%
0.420%
0.158%
0.180%
0.604%
0.348%
0.000%
0.815%
1.113%
0.000%
0.393%
0.506%
0.000%
0.115%
0.509%
1.600%
1.567%
0.396%
2.534%
Minimum Detect
Concentration (u.g/L)
Total
0.23
0.54
0.15
0.5
0.2
0.2
0.5
0.09
0.5
0.5
0.1
0.6
0.5
0.5
0.003
0.2
0.1
0.5
0.4
0.2
0.5
0.99
0.5
1.38
0.21
0.5
0.1
0.2
0.52
0.5
0.26
0.22
11.3
0.7
0.51
0.1
0.5
0.7
0.6
0.4
0.03
0.24
0.1
0.003
GW
0.23
0.54
0.15
0.6
0.2
0.2
1.9
0.09
0.5
0.5
0.1
1.8
0.5
0.5
0.4
0.2
0.5
0.5
0.4
0.2
0.5
0.99
0.5
0.21
0.5
0.1
0.57
0.52
0.5
0.5
0.4
11.3
3.1
0.51
0.67
0.5
0.7
0.6
0.4
0.03
0.24
0.1
0.03
SW
0.91
0.6
0.17
0.5
0.5
0.2
0.5
0.51
0.5
0.6
0.6
0.5
1.4
0.003
0.54
0.1
0.4
0.2
0.5
2.2
0.5
1.38
0.65
3.3
0.1
0.2
1.5
0.5
0.26
0.22
0.7
0.6
0.1
0.5
0.7
0.6
0.1
0.31
0.3
0.003
Median Detect
Concentration (u.g/L)
Total
0.62
1.245
0.68
0.8
1.3
0.2
1.9
0.47
0.77
0.5
0.6
3
0.715
1.05
0.4
0.7
0.75
3.35
0.6
0.3
0.8
1.25
0.8
1.38
1
3.3
0.64
0.8
1.5
0.65
0.9
1.04
11.3
6.8
1.63
1.4
0.9
0.9
0.92
1.6
0.41
0.5
0.765
1.1
GW
0.6
1.71
0.675
1.1
1.5
0.2
2.5
0.47
0.68
0.5
0.5
3.05
0.73
1
1.3
0.7
0.7
3.35
0.95
0.4
1.2
1.135
0.8
1
2.45
0.68
0.8
1.5
0.68
0.835
1.1
11.3
4.95
1.965
1.65
0.9
0.9
1.14
5
0.465
0.5
0.765
1.24
SW
1.105
1.2
0.71
0.5
1.1
0.3
0.6
0.83
0.5
1.15
0.6
0.7
1.4
0.3
0.77
0.8
0.6
0.3
0.6
2.2
0.85
1.38
0.65
3.3
0.445
2.4
1.5
0.5
0.9
0.53
12
1.63
0.6
0.815
0.7
1.1
0.145
0.5
0.535
1
90th Percentile Detect
Concentration (u.g/L)
Total
1.3
2.025
6
19.25
4.3
0.45
2.85
1.1
0.95
0.7
8.7
3.7
1.7
8.3
2
19.3
2.2
10
1.7
0.9
1.7
2.2
2.6
1.38
3.9
4.4
4.77
4.28
8.51
1.4
6.9
10.3
11.3
12
8.09
3.2
1.865
1.1
44
18.2
4.7
4.6
1.41
3.9
GW
0.62
5.74
7.4
37
3.4
0.2
2.85
1.1
0.95
0.7
8.7
3.7
1
8.3
2.2
19.3
2.2
10
3.1
1
2.6
2.14
2.7
3.9
4.4
5.94
4.1
8.51
1.4
6.9
10.3
11.3
6.8
9.17
2.7
1.8
1.1
44
18.2
4.7
1
1.41
3.5
SW
1.3
1.5
1.36
1.1
6
0.5
0.6
0.94
0.52
1.7
0.6
2.49
1.4
2
1
3.6
1.35
0.6
1.7
2.2
2.33
1.38
0.65
3.3
1.2
4.6
1.5
0.5
2.5
1.3
12
3.1
3.3
1.96
0.7
1.6
0.19
4.6
0.77
5.04
Maximum Detect
Concentration (u.g/L)
Total
1.3
5.74
16.3
37
27
0.5
2.85
1.2
1.2
1.4
300
3.8
11
8.3
3
19.3
3.6
10
3.1
2.9
2.6
2.2
5.2
1.38
38.9
4.4
28.62
4.6
8.51
10.7
11.5
33.6
11.3
12
9.17
3.3
8.4
1.1
44
18.2
7.6
15
14
300
GW
0.62
5.74
16.3
37
14.4
0.2
2.85
1.2
1.2
1.4
300
3.8
11
8.3
2.2
19.3
3.3
10
3.1
2.9
2.6
2.14
5.2
38.9
4.4
28.62
4.28
8.51
10.7
11.5
33.6
11.3
6.8
9.17
2.7
8.4
1.1
44
18.2
7.6
15
14
300
SW
1.3
1.6
2.04
1.1
27
0.5
0.6
0.94
0.6
1.7
0.6
2.49
1.4
3
1
3.6
1.7
0.9
1.7
2.2
2.6
1.38
0.65
3.3
1.2
4.6
1.5
0.5
2.5
1.3
12
3.1
3.3
2.55
0.7
1.6
0.19
6.8
0.77
27
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A14b. Carbon tetrachloride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
263
454
1,059
3,655
828
1,207
318
1,513
1,822
106
1,056
935
1,430
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
208
771
1,258
1,398
726
338
1,522
1,944
730
1,097
145
819
245
351
4,951
500
1,600
603
1,784
403
304
50,446
GW
474
202
382
1,011
3,138
607
1,168
315
1,487
1,706
94
1,023
878
1,326
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
181
760
1,217
1,361
687
317
1,287
1,819
518
945
136
757
233
162
4,609
454
1,429
560
1,764
243
256
46,190
SW
146
61
72
48
517
221
39
3
26
116
12
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
235
125
212
152
9
62
12
189
342
46
171
43
20
160
48
4,256
Total Population Served by Systems
Reporting
Total
606,193
4,218,278
2,453,348
6,166,873
35,828,727
4,999,966
2,723,376
698,987
17,495,771
7,485,298
1,293,745
2,543,141
1,093,666
9,217,990
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,292
1,462,181
948,788
7,748,495
1,698,755
973,592
4,889,304
10,227,597
3,123,687
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,273,258
491,035
4,039,526
1,416,020
446,177
226,934,787
GW
232,590
1,123,190
910,322
2,796,282
13,516,266
532,332
389,454
417,587
15,249,729
1,592,517
1,239,117
1,434,515
837,604
3,017,593
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,067
685,701
398,989
2,712,549
1,432,207
283,701
1,042,687
3,132,660
664,833
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
630,675
227,067
2,347,782
237,670
129,229
86,397,574
SW
373,603
3,095,088
1,543,026
3,370,591
22,312,461
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,846,617
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,642,583
263,968
1,691,744
1,178,350
316,948
140,537,213
Percent of Systems
with At Least One Detection
Total
0.645%
2.662%
10.793%
0.567%
1.450%
0.966%
0.249%
0.000%
1.058%
0.439%
6.604%
1.042%
0.321%
1.818%
0.339%
14.523%
0.836%
1.518%
0.741%
0.370%
3.034%
0.917%
0.472%
1.394%
0.481%
3.243%
0.238%
2.289%
1.653%
2.071%
0.657%
0.926%
2.329%
0.091%
2.069%
1.099%
0.000%
2.564%
1.414%
0.200%
0.250%
1.327%
0.841%
5.459%
1.645%
1.289%
GW
0.633%
2.475%
9.686%
0.297%
0.860%
0.659%
0.171%
0.000%
1.076%
0.234%
3.191%
0.880%
0.228%
1.508%
0.280%
2.174%
0.667%
0.913%
0.793%
0.137%
2.448%
0.522%
0.381%
1.032%
0.000%
3.158%
0.164%
1.984%
1.456%
1.893%
0.544%
0.605%
2.317%
0.106%
0.735%
0.925%
0.000%
1.235%
0.998%
0.220%
0.210%
1.250%
0.737%
5.761%
1.172%
0.935%
SW
0.685%
3.279%
16.667%
6.250%
5.029%
1.810%
2.564%
0.000%
0.000%
3.448%
33.333%
6.061%
1.754%
5.769%
2.273%
22.148%
1.695%
10.294%
0.000%
11.475%
33.333%
7.792%
1.667%
7.194%
3.704%
9.091%
2.439%
13.514%
5.128%
4.762%
1.277%
5.600%
2.358%
0.000%
22.222%
3.226%
0.000%
3.704%
7.018%
0.000%
0.585%
2.326%
10.000%
5.000%
4.167%
5.122%
Percent of Population Served
with At Least One Detection
Total
7.909%
6.997%
7.868%
7.926%
18.203%
35.089%
1.416%
0.000%
1.819%
0.865%
3.959%
3.427%
17.711%
2.718%
0.047%
41.009%
2.076%
37.537%
0.223%
2.411%
31.361%
5.219%
5.161%
4.948%
0.030%
37.521%
1.282%
25.374%
5.180%
1.880%
0.489%
4.948%
1.710%
0.110%
13.088%
1.076%
0.000%
5.568%
7.728%
3.482%
0.093%
0.932%
4.268%
6.587%
0.243%
9.831%
GW
20.598%
2.536%
9.050%
0.267%
6.351%
0.341%
0.728%
0.000%
2.087%
0.495%
2.984%
2.646%
0.919%
2.553%
0.085%
2.265%
3.911%
1.981%
0.555%
2.940%
6.370%
5.978%
0.175%
5.058%
0.000%
5.317%
0.041%
9.791%
6.052%
3.527%
2.087%
2.492%
2.032%
0.560%
0.345%
2.187%
0.000%
0.453%
2.334%
5.233%
0.151%
0.175%
2.031%
1.659%
0.412%
3.419%
SW
0.009%
8.616%
7.170%
14.280%
25.383%
39.229%
1.531%
0.000%
0.000%
0.965%
26.080%
4.436%
72.639%
2.799%
0.004%
44.450%
1.604%
46.655%
0.000%
2.209%
91.571%
4.244%
9.799%
4.912%
0.054%
65.960%
2.183%
33.767%
0.492%
1.203%
0.056%
6.033%
1.623%
0.000%
16.083%
0.765%
0.000%
7.340%
10.899%
0.000%
0.085%
1.584%
7.373%
7.581%
0.174%
13.773%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A14c. Carbon tetrachloride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 5 ug/L
Total
0
1
5
1
13
0
0
0
0
0
0
2
0
1
1
0
1
0
3
0
0
0
0
1
0
3
0
4
0
1
1
2
3
1
2
2
0
0
1
0
1
3
1
2
1
57
GW
0
1
5
1
7
0
0
0
0
0
0
2
0
1
1
0
1
0
3
0
0
0
0
1
0
3
0
4
0
1
1
2
3
1
1
2
0
0
1
0
1
3
1
1
1
49
SW
0
0
0
0
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
1
0
8
Percent of Systems
with At Least One Detection
> 5 ug/L
Total
0.000%
0.380%
1.101%
0.094%
0.356%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.189%
0.000%
0.070%
0.068%
0.000%
0.139%
0.000%
0.370%
0.000%
0.000%
0.000%
0.000%
0.042%
0.000%
0.389%
0.000%
0.286%
0.000%
0.296%
0.066%
0.103%
0.411%
0.091%
1.379%
0.244%
0.000%
0.000%
0.020%
0.000%
0.063%
0.498%
0.056%
0.496%
0.329%
0.113%
GW
0.000%
0.495%
1.309%
0.099%
0.223%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.196%
0.000%
0.075%
0.070%
0.000%
0.167%
0.000%
0.396%
0.000%
0.000%
0.000%
0.000%
0.045%
0.000%
0.395%
0.000%
0.294%
0.000%
0.315%
0.078%
0.110%
0.579%
0.106%
0.735%
0.264%
0.000%
0.000%
0.022%
0.000%
0.070%
0.536%
0.057%
0.412%
0.391%
0.106%
SW
0.000%
0.000%
0.000%
0.000%
1.161%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
11.111%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.625%
0.000%
0.188%
Population Served by Systems
with At Least One Detection
> 5 ug/L
Total
0
14,604
7,904
1,808
4,866,041
0
0
0
0
0
0
158
0
400
262
0
75
0
676
0
0
0
0
85
0
1,620
0
6,101
0
600
1,685
360
8,250
3,220
51,350
1,664
0
0
42
0
60
194
105
255
45
4,967,564
GW
0
14,604
7,904
1,808
95,742
0
0
0
0
0
0
158
0
400
262
0
75
0
676
0
0
0
0
85
0
1,620
0
6,101
0
600
1,685
360
8,250
3,220
600
1,664
0
0
42
0
60
194
105
74
45
146,334
SW
0
0
0
0
4,770,299
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
50,750
0
0
0
0
0
0
0
0
181
0
4,821,230
Percent of Population Served
with At Least One Detection
> 5 ug/L
Total
0.000%
0.346%
0.322%
0.029%
13.581%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.006%
0.000%
0.004%
0.005%
0.000%
0.001%
0.000%
0.093%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.111%
0.000%
0.079%
0.000%
0.062%
0.034%
0.004%
0.264%
0.110%
5.619%
0.050%
0.000%
0.000%
0.000%
0.000%
0.001%
0.040%
0.003%
0.018%
0.010%
2.189%
GW
0.000%
1.300%
0.868%
0.065%
0.708%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.011%
0.000%
0.013%
0.010%
0.000%
0.004%
0.000%
0.231%
0.000%
0.000%
0.000%
0.000%
0.005%
0.000%
0.236%
0.000%
0.225%
0.000%
0.211%
0.162%
0.011%
1.241%
0.560%
0.345%
0.227%
0.000%
0.000%
0.000%
0.000%
0.010%
0.085%
0.004%
0.031%
0.035%
0.169%
SW
0.000%
0.000%
0.000%
0.000%
21.380%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.858%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.015%
0.000%
3.431%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A14d. Carbon tetrachloride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2.5 ug/L
Total
0
1
6
1
20
0
2
0
0
0
0
2
1
1
1
2
2
2
3
1
1
1
0
5
0
3
2
5
5
1
1
3
4
1
2
5
0
4
8
0
1
4
2
2
1
106
GW
0
1
6
1
9
0
2
0
0
0
0
2
1
1
1
0
2
1
3
1
1
1
0
4
0
3
1
5
4
1
1
2
4
1
1
4
0
1
7
0
1
4
2
1
1
81
SW
0
0
0
0
11
0
0
0
0
0
0
0
0
0
0
2
0
1
0
0
0
0
0
1
0
0
1
0
1
0
0
1
0
0
1
1
0
3
1
0
0
0
0
1
0
25
Percent of Systems
with At Least One Detection
> 2.5 ug/L
Total
0.000%
0.380%
1.322%
0.094%
0.547%
0.000%
0.166%
0.000%
0.000%
0.000%
0.000%
0.189%
0.107%
0.070%
0.068%
0.830%
0.279%
0.190%
0.370%
0.034%
0.063%
0.071%
0.000%
0.211%
0.000%
0.389%
0.159%
0.358%
0.689%
0.296%
0.066%
0.154%
0.548%
0.091%
1.379%
0.611%
0.000%
1.140%
0.162%
0.000%
0.063%
0.663%
0.112%
0.496%
0.329%
0.210%
GW
0.000%
0.495%
1.571%
0.099%
0.287%
0.000%
0.171%
0.000%
0.000%
0.000%
0.000%
0.196%
0.114%
0.075%
0.070%
0.000%
0.333%
0.101%
0.396%
0.034%
0.064%
0.075%
0.000%
0.180%
0.000%
0.395%
0.082%
0.367%
0.582%
0.315%
0.078%
0.110%
0.772%
0.106%
0.735%
0.528%
0.000%
0.617%
0.152%
0.000%
0.070%
0.714%
0.113%
0.412%
0.391%
0.175%
SW
0.000%
0.000%
0.000%
0.000%
2.128%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.342%
0.000%
1.471%
0.000%
0.000%
0.000%
0.000%
0.000%
0.719%
0.000%
0.000%
2.439%
0.000%
2.564%
0.000%
0.000%
0.800%
0.000%
0.000%
11.111%
1.613%
0.000%
1.587%
0.292%
0.000%
0.000%
0.000%
0.000%
0.625%
0.000%
0.587%
Population Served by Systems
with At Least One Detection
> 2.5 ug/L
Total
0
14,604
8,365
1,808
5,084,536
0
2,834
0
0
0
0
158
200
400
262
53,226
7,007
13,952
676
45
100
90
0
13,028
0
1,620
12,123
6,381
3,061
600
1,685
10,160
8,500
3,220
51,350
14,916
0
40,657
118,115
0
60
239
13,415
255
45
5,487,693
GW
0
14,604
8,365
1,808
125,979
0
2,834
0
0
0
0
158
200
400
262
0
7,007
296
676
45
100
90
0
6,658
0
1,620
123
6,381
1,801
600
1,685
360
8,500
3,220
600
4,566
0
5,294
95,115
0
60
239
13,415
74
45
313,180
SW
0
0
0
0
4,958,557
0
0
0
0
0
0
0
0
0
0
53,226
0
13,656
0
0
0
0
0
6,370
0
0
12,000
0
1,260
0
0
9,800
0
0
50,750
10,350
0
35,363
23,000
0
0
0
0
181
0
5,174,513
Percent of Population Served
with At Least One Detection
> 2.5 ug/L
Total
0.000%
0.346%
0.341%
0.029%
14.191%
0.000%
0.104%
0.000%
0.000%
0.000%
0.000%
0.006%
0.018%
0.004%
0.005%
1.156%
0.082%
0.278%
0.093%
0.001%
0.002%
0.003%
0.000%
0.186%
0.000%
0.111%
1.278%
0.082%
0.180%
0.062%
0.034%
0.099%
0.272%
0.110%
5.619%
0.444%
0.000%
0.715%
0.470%
0.000%
0.001%
0.049%
0.332%
0.018%
0.010%
2.418%
GW
0.000%
1.300%
0.919%
0.065%
0.932%
0.000%
0.728%
0.000%
0.000%
0.000%
0.000%
0.011%
0.024%
0.013%
0.010%
0.000%
0.400%
0.029%
0.231%
0.002%
0.003%
0.005%
0.000%
0.384%
0.000%
0.236%
0.031%
0.235%
0.126%
0.211%
0.162%
0.011%
1.279%
0.560%
0.345%
0.623%
0.000%
0.362%
1.023%
0.000%
0.010%
0.105%
0.571%
0.031%
0.035%
0.362%
SW
0.000%
0.000%
0.000%
0.000%
22.223%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.259%
0.000%
0.342%
0.000%
0.000%
0.000%
0.000%
0.000%
0.121%
0.000%
0.000%
2.183%
0.000%
0.473%
0.000%
0.000%
0.138%
0.000%
0.000%
6.858%
0.394%
0.000%
0.837%
0.145%
0.000%
0.000%
0.000%
0.000%
0.015%
0.000%
3.682%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A14e. Carbon tetrachloride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>lug/L
Total
1
6
16
4
37
0
2
0
3
1
1
3
2
5
4
10
3
7
5
5
4
7
4
14
1
11
2
9
6
5
3
9
8
1
2
5
0
5
31
1
2
5
5
4
2
261
GW
0
4
13
3
17
0
2
0
3
1
1
2
2
3
3
1
2
4
5
2
4
4
3
11
0
11
1
8
5
4
3
6
7
1
1
4
0
2
20
1
2
4
5
2
2
179
SW
1
2
3
1
20
0
0
0
0
0
0
1
0
2
1
9
1
3
0
3
0
3
1
3
1
0
1
1
1
1
0
3
1
0
1
1
0
3
11
0
0
1
0
2
0
82
Percent of Systems
with At Least One Detection
> 1 ug/L
Total
0.161%
2.281%
3.524%
0.378%
1.012%
0.000%
0.166%
0.000%
0.198%
0.055%
0.943%
0.284%
0.214%
0.350%
0.271%
4.149%
0.418%
0.664%
0.617%
0.168%
0.253%
0.494%
0.472%
0.591%
0.481%
1.427%
0.159%
0.644%
0.826%
1.479%
0.197%
0.463%
1.096%
0.091%
1.379%
0.611%
0.000%
1.425%
0.626%
0.200%
0.125%
0.829%
0.280%
0.993%
0.658%
0.517%
GW
0.000%
1.980%
3.403%
0.297%
0.542%
0.000%
0.171%
0.000%
0.202%
0.059%
1.064%
0.196%
0.228%
0.226%
0.210%
1.087%
0.333%
0.406%
0.661%
0.069%
0.258%
0.299%
0.381%
0.494%
0.000%
1.447%
0.082%
0.588%
0.728%
1.262%
0.233%
0.330%
1.351%
0.106%
0.735%
0.528%
0.000%
1.235%
0.434%
0.220%
0.140%
0.714%
0.283%
0.823%
0.781%
0.388%
SW
0.685%
3.279%
4.167%
2.083%
3.868%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.030%
0.000%
1.923%
2.273%
6.040%
0.847%
4.412%
0.000%
4.918%
0.000%
3.896%
1.667%
2.158%
3.704%
0.000%
2.439%
2.703%
2.564%
4.762%
0.000%
2.400%
0.472%
0.000%
11.111%
1.613%
0.000%
1.587%
3.216%
0.000%
0.000%
2.326%
0.000%
1.250%
0.000%
1.927%
Population Served by Systems
with At Least One Detection
>lug/L
Total
34
289,341
57,851
8,565
5,653,559
0
2,834
0
125
450
650
30,476
7,700
150,874
2,259
237,356
77,214
133,055
1,411
56,421
21,419
107,971
39,118
55,698
166
5,986
12,123
325,501
4,461
15,031
5,560
123,433
9,468
3,220
51,350
14,916
0
41,989
420,783
88,900
680
4,419
17,828
2,305
153
8,082,653
GW
0
22,680
35,581
7,465
421,543
0
2,834
0
125
450
650
158
7,700
6,335
2,162
42
7,007
8,732
1,411
83
21,419
92,630
641
36,538
0
5,986
123
13,625
3,201
6,731
5,560
6,581
9,133
3,220
600
4,566
0
6,626
160,639
88,900
680
239
17,828
324
153
1,010,901
SW
34
266,661
22,270
1,100
5,232,016
0
0
0
0
0
0
30,318
0
144,539
97
237,314
70,207
124,323
0
56,338
0
15,341
38,477
19,160
166
0
12,000
311,876
1,260
8,300
0
116,852
335
0
50,750
10,350
0
35,363
260,144
0
0
4,180
0
1,981
0
7,071,752
Percent of Population Served
with At Least One Detection
>lug/L
Total
0.006%
6.859%
2.358%
0.139%
15.779%
0.000%
0.104%
0.000%
0.001%
0.006%
0.050%
1.198%
0.704%
1.637%
0.046%
5.157%
0.902%
2.649%
0.194%
0.788%
0.503%
3.594%
5.161%
0.796%
0.030%
0.409%
1.278%
4.201%
0.263%
1.544%
0.114%
1.207%
0.303%
0.110%
5.619%
0.444%
0.000%
0.739%
1.676%
3.482%
0.013%
0.900%
0.441%
0.163%
0.034%
3.562%
GW
0.000%
2.019%
3.909%
0.267%
3.119%
0.000%
0.728%
0.000%
0.001%
0.028%
0.052%
0.011%
0.919%
0.210%
0.084%
0.011%
0.400%
0.852%
0.482%
0.004%
0.711%
5.482%
0.175%
2.108%
0.000%
0.873%
0.031%
0.502%
0.224%
2.373%
0.533%
0.210%
1.374%
0.560%
0.345%
0.623%
0.000%
0.453%
1.728%
5.233%
0.108%
0.105%
0.759%
0.136%
0.118%
1.170%
SW
0.009%
8.616%
1.443%
0.033%
23.449%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.735%
0.000%
2.331%
0.004%
5.614%
1.031%
3.110%
0.000%
1.088%
0.000%
1.167%
9.799%
0.364%
0.054%
0.000%
2.183%
6.193%
0.473%
1.203%
0.000%
1.647%
0.014%
0.000%
6.858%
0.394%
0.000%
0.837%
1.645%
0.000%
0.000%
1.584%
0.000%
0.168%
0.000%
5.032%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A14f. Carbon tetrachloride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.5 ug/L
Total
3
7
34
5
47
0
3
0
10
7
4
6
3
23
4
18
5
11
5
8
13
9
4
31
1
20
2
19
11
7
4
16
12
1
3
9
0
8
60
1
4
7
5
5
4
459
GW
2
5
26
3
24
0
2
0
10
3
2
4
2
19
3
1
3
8
5
3
11
5
3
22
0
19
1
16
10
6
4
10
9
1
1
7
0
2
40
1
3
6
5
2
3
312
SW
1
2
8
2
23
0
1
0
0
4
2
2
1
4
1
17
2
3
0
5
2
4
1
9
1
1
1
3
1
1
0
6
3
0
2
2
0
6
20
0
1
1
0
3
1
147
Percent of Systems
with At Least One Detection
> 0.5 ug/L
Total
0.484%
2.662%
7.489%
0.472%
1.286%
0.000%
0.249%
0.000%
0.661%
0.384%
3.774%
0.568%
0.321%
1.608%
0.271%
7.469%
0.696%
1.044%
0.617%
0.269%
0.822%
0.635%
0.472%
1.310%
0.481%
2.594%
0.159%
1.359%
1.515%
2.071%
0.263%
0.823%
1.644%
0.091%
2.069%
1.099%
0.000%
2.279%
1.212%
0.200%
0.250%
1.161%
0.280%
1.241%
1.316%
0.910%
GW
0.422%
2.475%
6.806%
0.297%
0.765%
0.000%
0.171%
0.000%
0.672%
0.176%
2.128%
0.391%
0.228%
1.433%
0.210%
1.087%
0.500%
0.811%
0.661%
0.103%
0.709%
0.373%
0.381%
0.987%
0.000%
2.500%
0.082%
1.176%
1.456%
1.893%
0.311%
0.550%
1.737%
0.106%
0.735%
0.925%
0.000%
1.235%
0.868%
0.220%
0.210%
1.071%
0.283%
0.823%
1.172%
0.675%
SW
0.685%
3.279%
11.111%
4.167%
4.449%
0.000%
2.564%
0.000%
0.000%
3.448%
16.667%
6.061%
1.754%
3.846%
2.273%
11.409%
1.695%
4.412%
0.000%
8.197%
6.667%
5.195%
1.667%
6.475%
3.704%
9.091%
2.439%
8.108%
2.564%
4.762%
0.000%
4.800%
1.415%
0.000%
22.222%
3.226%
0.000%
3.175%
5.848%
0.000%
0.585%
2.326%
0.000%
1.875%
2.083%
3.454%
Population Served by Systems
with At Least One Detection
> 0.5 ug/L
Total
654
295,146
117,725
188,790
6,223,723
0
38,567
0
23,869
64,136
34,202
78,140
193,700
225,363
2,259
1,360,553
153,562
144,539
1,411
74,534
494,839
143,703
39,118
275,701
166
546,155
12,123
1,088,924
87,943
18,306
19,060
244,937
26,926
3,220
119,613
36,110
0
110,433
1,805,395
88,900
4,902
4,537
17,828
12,670
1,023
14,423,405
GW
620
28,485
57,747
7,465
625,811
0
2,834
0
23,869
7,284
22,946
28,956
7,700
76,262
2,162
42
44,374
20,216
1,411
11,983
28,247
93,924
641
80,684
0
33,991
123
110,182
86,683
10,006
19,060
32,451
10,169
3,220
600
16,029
0
6,626
201,982
88,900
950
357
17,828
324
533
1,813,677
SW
34
266,661
59,978
181,325
5,597,912
0
35,733
0
0
56,852
11,256
49,184
186,000
149,101
97
1,360,511
109,188
124,323
0
62,551
466,592
49,779
38,477
195,017
166
512,164
12,000
978,742
1,260
8,300
0
212,486
16,757
0
119,013
20,081
0
103,807
1,603,413
0
3,952
4,180
0
12,346
490
12,609,728
Percent of Population Served
with At Least One Detection
> 0.5 ug/L
Total
0.108%
6.997%
4.799%
3.061%
17.371%
0.000%
1.416%
0.000%
0.136%
0.857%
2.644%
3.073%
17.711%
2.445%
0.046%
29.562%
1.795%
2.877%
0.194%
1.041%
11.615%
4.784%
5.161%
3.940%
0.030%
37.352%
1.278%
14.053%
5.177%
1.880%
0.390%
2.395%
0.862%
0.110%
13.088%
1.076%
0.000%
1.942%
7.189%
3.482%
0.093%
0.924%
0.441%
0.895%
0.229%
6.356%
GW
0.267%
2.536%
6.344%
0.267%
4.630%
0.000%
0.728%
0.000%
0.157%
0.457%
1.852%
2.019%
0.919%
2.527%
0.084%
0.011%
2.536%
1.972%
0.482%
0.606%
0.938%
5.559%
0.175%
4.656%
0.000%
4.957%
0.031%
4.062%
6.052%
3.527%
1.828%
1.036%
1.530%
0.560%
0.345%
2.187%
0.000%
0.453%
2.173%
5.233%
0.151%
0.157%
0.759%
0.136%
0.412%
2.099%
SW
0.009%
8.616%
3.887%
5.380%
25.089%
0.000%
1.531%
0.000%
0.000%
0.965%
20.605%
4.436%
72.639%
2.405%
0.004%
32.186%
1.604%
3.110%
0.000%
1.208%
37.337%
3.787%
9.799%
3.704%
0.054%
65.960%
2.183%
19.435%
0.473%
1.203%
0.000%
2.995%
0.681%
0.000%
16.083%
0.765%
0.000%
2.458%
10.139%
0.000%
0.085%
1.584%
0.000%
1.048%
0.155%
8.973%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A15. Chlordane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of 1 nterest
>2ug/L
>lug/L
>2ug/L
>lug/L
>2ug/L
>lug/L
Total # Systems
Reporting
28,808
28,808
3,033
3,033
31,841
31,841
# Systems Exceeding
Threshold of Interest
4
12
0
0
4
12
% Systems Exceeding
Threshold of Interest
0.014%
0.042%
0.000%
0.000%
0.013%
0.038%
Total Pop. Served by
Systems Reporting
66,936,780
66,936,780
115,100,195
115,100,195
182,036,975
182,036,975
Total Pop. Served by
Systems Exceeding
Threshold of Interest
625
1,645
0
0
625
1,645
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.001%
0.002%
0.000%
0.000%
0.000%
0.001%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A15a. Chlordane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
103
499
1,663
6,816
12,986
2,556
1,506
272
2,375
1,491
2,101
45
1,806
4,685
2,234
1,717
2,964
2,712
387
3,613
4,761
5,237
2,994
13,580
409
4,061
4,193
5
4,281
1,620
2,884
238
2,050
601
2,964
953
62
11,042
7,103
501
1,279
3,178
643
1,283
128,453
GW
52
370
1,422
5,381
7,473
1,854
1,185
254
2,310
1,410
2,004
29
1,548
3,945
2,070
437
2,184
1,724
339
3,399
4,620
4,499
2,693
12,449
343
3,748
3,874
5
4,033
1,198
2,173
105
1,567
414
2,569
844
12
5,282
5,922
178
1,089
3,083
336
963
101,389
SW
51
129
241
1,435
5,513
702
321
18
65
81
97
16
258
740
164
1,280
780
988
48
214
141
738
301
1,131
66
313
319
0
248
422
711
133
483
187
395
109
50
5,760
1,181
323
190
95
307
320
27,064
Percent of Samples
with Detections
Total
0.000%
0.802%
0.000%
0.015%
0.000%
0.000%
0.133%
0.000%
0.589%
0.000%
0.048%
0.000%
0.000%
0.000%
0.000%
0.291%
0.135%
0.037%
0.000%
0.000%
0.000%
0.000%
0.000%
0.810%
0.000%
0.049%
0.000%
0.000%
0.023%
0.000%
0.035%
0.000%
0.000%
0.166%
0.202%
0.000%
0.000%
0.036%
0.000%
0.000%
0.078%
0.000%
1.711%
0.078%
0.132%
GW
0.000%
0.000%
0.000%
0.019%
0.000%
0.000%
0.169%
0.000%
0.606%
0.000%
0.050%
0.000%
0.000%
0.000%
0.000%
0.000%
0.092%
0.058%
0.000%
0.000%
0.000%
0.000%
0.000%
0.884%
0.000%
0.053%
0.000%
0.000%
0.025%
0.000%
0.046%
0.000%
0.000%
0.242%
0.195%
0.000%
0.000%
0.057%
0.000%
0.000%
0.092%
0.000%
2.381%
0.104%
0.152%
SW
0.000%
3.101%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.391%
0.256%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.253%
0.000%
0.000%
0.017%
0.000%
0.000%
0.000%
0.000%
0.977%
0.000%
0.059%
Minimum Detect
Concentration (u.g/L)
Total
0.1
0.1
2.2
0.008
0.3
0.06
0.1
1
0.04
0.3
0.02
0.1
0.53
0.4
0.1
0.05
0.005
0.4
0.005
GW
0.1
2.2
0.008
0.3
0.1
1
0.04
0.3
0.02
0.1
0.53
0.4
0.1
0.05
0.005
0.4
0.005
SW
0.1
0.06
0.1
0.9
0.13
0.02
0.02
Median Detect
Concentration (u.g/L)
Total
0.1
0.1
2.2
0.1
0.3
0.25
0.1
1
0.565
0.305
0.02
0.1
0.53
1.075
0.115
0.05
0.02
0.4
0.38
GW
0.1
2.2
0.1
0.3
0.1
1
0.565
0.305
0.02
0.1
0.53
1.13
0.1
0.05
0.0137
0.4
0.4
SW
0.1
0.25
0.1
0.9
0.13
0.02
0.1
90th Percentile Detect
Concentration (u.g/L)
Total
0.2
0.1
2.2
0.22
0.3
0.3
0.1
1
1.85
0.31
0.02
0.1
0.53
1.7
0.22
0.05
0.02
0.4
1.59
GW
0.1
2.2
0.22
0.3
0.1
1
1.85
0.31
0.02
0.1
0.53
1.7
0.22
0.05
0.02
0.4
1.6
SW
0.2
0.3
0.1
0.9
0.13
0.5
0.5
Maximum Detect
Concentration (u.g/L)
Total
0.2
0.1
2.2
0.71
0.3
0.3
0.1
1
5.4
0.31
0.02
0.1
0.53
1.7
0.22
0.05
0.5
0.4
5.4
GW
0.1
2.2
0.71
0.3
0.1
1
5.4
0.31
0.02
0.1
0.53
1.7
0.22
0.05
0.02
0.4
5.4
SW
0.2
0.3
0.1
0.9
0.13
0.5
0.9
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A15b. Chlordane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
15
171
450
946
1,602
814
662
115
1,308
297
112
4
721
1,371
1,402
242
644
860
228
2,147
1,287
1,384
813
2,365
209
737
1,237
2
693
290
1,347
46
1,084
86
773
261
13
2,002
426
182
437
1,409
343
304
31,841
GW
9
126
379
898
1,315
595
624
112
1,287
283
100
3
674
1,267
1,358
93
527
792
204
2,088
1,258
1,308
753
2,228
182
726
1,196
2
657
269
1,117
36
934
77
714
240
6
1,665
390
71
404
1,389
196
256
28,808
SW
6
45
71
48
287
219
38
3
21
14
12
1
47
104
44
149
117
68
24
59
29
76
60
137
27
11
41
0
36
21
230
10
150
9
59
21
7
337
36
111
33
20
147
48
3,033
Total Population Served by Systems
Reporting
Total
246,299
2,702,037
2,447,627
6,079,868
33,465,085
4,993,005
2,596,395
480,758
16,785,207
997,274
1,305,882
162,217
978,754
9,186,700
4,866,720
4,602,489
8,485,233
4,905,976
473,968
6,913,331
3,934,332
2,624,615
753,259
6,885,177
559,198
1,453,762
945,754
6,121
1,662,757
960,897
4,923,256
3,538,076
2,937,104
902,061
3,427,802
622,272
675,214
21,523,196
2,500,736
2,391,215
436,586
3,883,768
1,368,815
446,177
182,036,975
GW
14,189
589,449
905,863
2,709,277
11,798,465
526,096
262,508
199,358
14,546,031
305,252
1,251,254
27,600
742,078
2,986,303
2,546,984
375,460
1,682,851
907,869
103,532
1,752,006
2,684,691
1,680,154
360,590
1,733,551
253,973
677,282
395,955
6,121
1,399,859
271,006
981,566
147,544
572,354
162,083
801,019
263,101
145,112
5,759,696
1,667,550
30,317
185,422
2,192,024
204,156
129,229
66,936,780
SW
232,110
2,112,588
1,541,764
3,370,591
21,666,620
4,466,909
2,333,887
281,400
2,239,176
692,022
54,628
134,617
236,676
6,200,397
2,319,736
4,227,029
6,802,382
3,998,107
370,436
5,161,325
1,249,641
944,461
392,669
5,151,626
305,225
776,480
549,799
0
262,898
689,891
3,941,690
3,390,532
2,364,750
739,978
2,626,783
359,171
530,102
15,763,500
833,186
2,360,898
251,164
1,691,744
1,164,659
316,948
115,100,195
Percent of Systems
with At Least One Detection
Total
0.000%
0.585%
0.000%
0.106%
0.000%
0.000%
0.151%
0.000%
0.612%
0.000%
0.893%
0.000%
0.000%
0.000%
0.000%
1.240%
0.466%
0.116%
0.000%
0.000%
0.000%
0.000%
0.000%
1.015%
0.000%
0.271%
0.000%
0.000%
0.144%
0.000%
0.074%
0.000%
0.000%
1.163%
0.517%
0.000%
0.000%
0.200%
0.000%
0.000%
0.229%
0.000%
2.624%
0.329%
0.210%
GW
0.000%
0.000%
0.000%
0.111%
0.000%
0.000%
0.160%
0.000%
0.622%
0.000%
1.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.380%
0.126%
0.000%
0.000%
0.000%
0.000%
0.000%
1.077%
0.000%
0.275%
0.000%
0.000%
0.152%
0.000%
0.090%
0.000%
0.000%
1.299%
0.420%
0.000%
0.000%
0.180%
0.000%
0.000%
0.248%
0.000%
4.082%
0.391%
0.205%
SW
0.000%
2.222%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.013%
0.855%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.695%
0.000%
0.000%
0.297%
0.000%
0.000%
0.000%
0.000%
0.680%
0.000%
0.264%
Percent of Population Served
with At Least One Detection
Total
0.000%
1.445%
0.000%
0.016%
0.000%
0.000%
0.003%
0.000%
15.623%
0.000%
4.860%
0.000%
0.000%
0.000%
0.000%
6.983%
0.905%
0.006%
0.000%
0.000%
0.000%
0.000%
0.000%
0.064%
0.000%
0.153%
0.000%
0.000%
1.416%
0.000%
0.001%
0.000%
0.000%
0.007%
1.190%
0.000%
0.000%
1.004%
0.000%
0.000%
0.071%
0.000%
0.441%
0.006%
1.878%
GW
0.000%
0.000%
0.000%
0.037%
0.000%
0.000%
0.030%
0.000%
18.027%
0.000%
5.072%
0.000%
0.000%
0.000%
0.000%
0.000%
1.961%
0.030%
0.000%
0.000%
0.000%
0.000%
0.000%
0.256%
0.000%
0.328%
0.000%
0.000%
1.682%
0.000%
0.006%
0.000%
0.000%
0.037%
0.031%
0.000%
0.000%
0.137%
0.000%
0.000%
0.166%
0.000%
0.812%
0.021%
4.124%
SW
0.000%
1.848%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
7.603%
0.643%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.544%
0.000%
0.000%
1.320%
0.000%
0.000%
0.000%
0.000%
0.376%
0.000%
0.571%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A15c. Chlordane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2 ug/L
Total
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4
GW
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 2 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.151%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.127%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.013%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.160%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.135%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.014%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 2 ug/L
Total
0
0
0
0
0
0
80
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
545
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
625
GW
0
0
0
0
0
0
80
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
545
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
625
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 2 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.008%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.030%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.031%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A15d. Chlordane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>lug/L
Total
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
8
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
12
GW
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
8
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
12
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 1 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.151%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.116%
0.000%
0.000%
0.000%
0.000%
0.000%
0.338%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.259%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.038%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.160%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.126%
0.000%
0.000%
0.000%
0.000%
0.000%
0.359%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.280%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.042%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
>lug/L
Total
0
0
0
0
0
0
80
0
0
0
0
0
0
0
0
0
0
276
0
0
0
0
0
1,139
0
0
0
0
0
0
0
0
0
0
150
0
0
0
0
0
0
0
0
0
1,645
GW
0
0
0
0
0
0
80
0
0
0
0
0
0
0
0
0
0
276
0
0
0
0
0
1,139
0
0
0
0
0
0
0
0
0
0
150
0
0
0
0
0
0
0
0
0
1,645
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
>lug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.006%
0.000%
0.000%
0.000%
0.000%
0.000%
0.017%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.030%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.030%
0.000%
0.000%
0.000%
0.000%
0.000%
0.066%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.019%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A16. Chromium (total) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
>0.1 mg/L
> 0.05 mg/L
>0.1 mg/L
> 0.05 mg/L
>0.1 mg/L
> 0.05 mg/L
Total # Systems
Reporting
44,905
44,905
4,003
4,003
48,908
48,908
# Systems Exceeding
Threshold of Interest
37
144
6
28
43
172
% Systems Exceeding
Threshold of Interest
0.082%
0.321%
0.150%
0.699%
0.088%
0.352%
Total Pop. Served by
Systems Reporting
85,254,121
85,254,121
144,374,309
144,374,309
229,628,430
229,628,430
Total Pop. Served by
Systems Exceeding
Threshold of Interest
122,695
1,064,526
593,922
8,424,108
716,617
9,488,634
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.144%
1.249%
0.411%
5.835%
0.312%
4.132%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A16a. Chromium (total) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
873
2,684
2,163
6,307
39,301
4,381
2,588
686
2,146
2,884
1,178
1,492
2,644
3,406
4,699
1,777
2,934
5,107
2,710
6,138
3,338
5,687
2,757
9,230
347
1,883
2,941
6,569
3,513
1,877
3,498
4,074
420
1,323
892
3,448
388
1,658
14,914
6,945
2,807
2,083
7,017
1,115
1,130
185,952
GW
618
1,821
1,507
4,942
22,767
2,326
1,865
638
2,077
2,490
1,116
1,231
2,374
3,004
4,218
544
1,972
3,983
2,311
5,964
3,280
4,909
2,469
7,792
303
1,797
2,777
5,851
3,187
1,301
2,559
3,428
346
960
661
2,984
359
485
12,332
5,447
2,197
1,755
6,847
425
875
143,094
SW
255
863
656
1,365
16,534
2,055
723
48
69
394
62
261
270
402
481
1,233
962
1,124
399
174
58
778
288
1,438
44
86
164
718
326
576
939
646
74
363
231
464
29
1,173
2,582
1,498
610
328
170
690
255
42,858
Percent of Samples
with Detections
Total
18.328%
3.949%
5.317%
38.116%
18.081%
20.155%
5.216%
63.557%
29.031%
0.069%
32.258%
1.743%
15.091%
6.078%
25.474%
10.129%
3.885%
8.028%
37.749%
28.315%
0.090%
6.260%
1.596%
2.546%
60.231%
59.214%
1.394%
4.567%
60.689%
45.551%
8.548%
5.400%
24.048%
9.221%
6.839%
1.160%
37.629%
3.317%
12.854%
9.258%
1.710%
3.313%
25.281%
4.126%
2.389%
15.328%
GW
21.036%
3.569%
6.768%
34.480%
19.375%
22.700%
4.450%
62.226%
29.754%
0.040%
34.050%
1.625%
16.217%
5.959%
26.505%
7.904%
3.803%
3.917%
41.281%
28.672%
0.091%
5.765%
1.499%
2.490%
64.356%
59.265%
1.476%
4.085%
62.096%
50.423%
7.776%
6.068%
16.763%
10.729%
6.505%
1.340%
37.326%
3.918%
13.055%
8.372%
1.866%
3.590%
24.726%
5.882%
1.943%
15.696%
SW
11.765%
4.751%
1.982%
51.282%
16.300%
17.275%
7.192%
81.250%
7.246%
0.254%
0.000%
2.299%
5.185%
6.965%
16.424%
11.111%
4.054%
22.598%
17.293%
16.092%
0.000%
9.383%
2.431%
2.851%
31.818%
58.140%
0.000%
8.496%
46.933%
34.549%
10.650%
1.858%
58.108%
5.234%
7.792%
0.000%
41.379%
3.069%
11.890%
12.483%
1.148%
1.829%
47.647%
3.043%
3.922%
14.098%
Minimum Detect
Concentration (mg/L)
Total
0.00016
0.0008
0.001
0.0003
9E-06
0.0001
0.0001
0.0001
0.0002
0.02
0.002
0.001
0.00045
0.0004
0.0002
0.0001
0.0003
0.0002
0.0005
0.0006
0.01
0.00101
0.001
0.0001
0.00101
0.001
0.001
0.00008
1.3E-05
0.0009
0.0004
0.00011
0.001
0.00011
0.005
0.01
0.0006
0.001
0.001
0.0001
0.001
0.00027
0.00005
0.00028
0.0007
9E-06
GW
0.00054
0.001
0.001
0.0003
9E-06
0.0002
0.0003
0.0001
0.0002
0.03
0.002
0.004
0.00045
0.0004
0.0002
0.0001
0.0008
0.0002
0.0005
0.0006
0.01
0.00101
0.001
0.0001
0.00101
0.001
0.001
0.0005
1.3E-05
0.0009
0.00044
0.001
0.001
0.0005
0.005
0.01
0.0006
0.0014
0.001
0.001
0.001
0.00027
0.00005
0.001
0.001
9E-06
SW
0.00016
0.0008
0.001
0.00044
9E-06
0.0001
0.0001
0.0001
0.0014
0.02
0.001
0.002
0.004
0.0007
0.0001
0.0003
0.0002
0.0005
0.001
0.00102
0.001
0.0002
0.00114
0.00105
0.00008
0.0001
0.001
0.0004
0.00011
0.01
0.00011
0.005
0.0008
0.001
0.001
0.0001
0.003
0.001
0.00047
0.00028
0.0007
9E-06
Median Detect
Concentration (mg/L)
Total
0.00308
0.00163
0.0014
0.01
0.01
0.0045
0.002
0.0015
0.0018
0.025
0.003
0.01
0.005
0.006
0.0069
0.002
0.0036
0.003
0.0012
0.002
0.02
0.0022
0.003
0.005
0.0034
0.00299
0.0055
0.003
0.003
0.004
0.00319
0.01
0.03
0.00166
0.007
0.02
0.0036
0.0026
0.00369
0.006
0.01
0.003
0.0017
0.00249
0.0037
0.00415
GW
0.00364
0.002
0.0014
0.01
0.0092
0.0067
0.006
0.0014
0.0018
0.03
0.003
0.01
0.005
0.006
0.0069
0.0035
0.004
0.00475
0.0012
0.002
0.02
0.00224
0.003
0.006
0.00355
0.003
0.0055
0.003
0.003
0.005
0.0036
0.01
0.03
0.0015
0.007
0.02
0.00365
0.0026
0.00411
0.00695
0.01
0.003
0.0017
0.002
0.0038
0.004
SW
0.00078
0.0014
0.0012
0.01
0.01
0.0028
0.001
0.002
0.003
0.02
0.01
0.0045
0.0062
0.0068
0.002
0.0034
0.002
0.0008
0.001
0.00208
0.002
0.0025
0.00173
0.00213
0.002
0.003
0.004
0.0021
0.0028
0.05
0.00185
0.007
0.0032
0.0026
0.00236
0.0049
0.01
0.017
0.0026
0.00297
0.00285
0.006
90th Percentile Detect
Concentration (mg/L)
Total
0.00737
0.01
0.0036
0.03
0.02
0.01
0.05
0.0049
0.01
0.03
0.008
0.04
0.01
0.01
0.02
0.01
0.01
0.01
0.0037
0.01
0.05
0.00355
0.02
0.02
0.01
0.00859
0.02
0.01
0.0094
0.01
0.0084
0.02
0.06
0.00441
0.01
0.085
0.01
0.02
0.01
0.02
0.01
0.03
0.01
0.01
0.02
0.01
GW
0.00763
0.00937
0.0036
0.02
0.02
0.01
0.06
0.0053
0.01
0.03
0.008
0.045
0.01
0.01
0.02
0.02
0.01
0.02
0.0039
0.01
0.05
0.00355
0.01
0.02
0.01
0.00834
0.02
0.01
0.0095
0.01
0.0089
0.02
0.06
0.00441
0.01
0.085
0.01
0.02
0.01
0.02
0.01
0.01
0.01
0.0094
0.02
0.01
SW
0.00465
0.01
0.0015
0.03
0.02
0.0091
0.003
0.0038
0.008
0.02
0.03
0.01
0.01
0.02
0.0083
0.01
0.01
0.0026
0.002
0.0031
0.03
0.008
0.00528
0.01
0.01
0.008
0.01
0.00625
0.02
0.07
0.02
0.01
0.0066
0.01
0.00568
0.02
0.01
0.32
0.01
0.01
0.0137
0.02
Maximum Detect
Concentration (mg/L)
Total
0.06
0.06
0.01
0.53
0.64
0.12
0.15
0.04
0.12
0.03
0.01
0.08
0.06
0.11
0.1
0.03
0.06
0.1
0.08
0.05
0.05
0.01
0.06
5.2
0.05
0.02
0.08
0.25
0.08
0.14
0.54
0.04
0.16
0.02
0.03
0.2
0.03
0.05
0.14
0.14
0.61
0.32
0.42
0.02
0.08
5.2
GW
0.06
0.02
0.01
0.53
0.64
0.06
0.15
0.04
0.12
0.03
0.01
0.08
0.06
0.11
0.1
0.03
0.04
0.1
0.08
0.05
0.05
0.01
0.06
5.2
0.05
0.02
0.08
0.25
0.08
0.14
0.54
0.04
0.16
0.01
0.01
0.2
0.03
0.04
0.14
0.14
0.61
0.08
0.42
0.02
0.08
5.2
SW
0.00511
0.06
0.0019
0.09
0.12
0.12
0.006
0.0063
0.008
0.02
0.03
0.01
0.01
0.03
0.03
0.06
0.02
0.0054
0.01
0.00595
0.03
0.1
0.01
0.01
0.06
0.02
0.02
0.02
0.03
0.08
0.02
0.03
0.01
0.05
0.04
0.14
0.01
0.32
0.01
0.02
0.02
0.32
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A16b. Chromium (total) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
494
352
453
1,049
3,726
838
1,170
280
1,331
1,600
107
966
893
1,490
1,622
242
676
1,038
807
2,994
1,459
1,421
846
2,285
217
731
1,216
1,374
724
325
1,580
1,916
202
735
143
823
235
350
4,930
507
1,582
600
1,823
452
304
48,908
GW
392
279
381
1,001
3,206
617
1,131
277
1,305
1,485
95
933
847
1,387
1,573
93
558
970
753
2,942
1,432
1,344
787
2,146
190
720
1,175
1,337
685
305
1,339
1,791
175
613
134
758
224
161
4,587
457
1,414
557
1,803
291
255
44,905
SW
102
73
72
48
520
221
39
3
26
115
12
33
46
103
49
149
118
68
54
52
27
77
59
139
27
11
41
37
39
20
241
125
27
122
9
65
11
189
343
50
168
43
20
161
49
4,003
Total Population Served by Systems
Reporting
Total
550,696
4,701,100
2,452,800
6,161,306
36,184,328
4,998,506
2,716,176
679,723
17,170,469
7,244,380
1,303,767
2,500,343
1,047,634
9,168,134
4,979,847
4,602,489
8,525,575
5,022,488
727,775
6,682,527
3,959,159
3,006,743
757,540
6,973,879
563,069
1,449,290
942,517
7,762,423
1,667,433
970,653
11,202,468
10,217,699
749,266
2,777,179
913,584
3,468,333
328,972
5,683,572
25,070,435
2,543,652
4,803,450
490,839
4,044,416
1,415,612
446,184
229,628,430
GW
210,676
1,463,066
909,774
2,790,715
13,391,438
533,275
382,254
398,323
14,924,427
1,352,049
1,249,139
1,391,717
805,559
2,968,062
2,619,392
375,460
1,718,151
1,024,381
292,171
1,890,196
2,725,622
1,692,282
365,141
1,708,713
257,844
672,810
392,718
2,726,477
1,400,885
280,854
1,223,020
3,122,762
276,712
487,433
173,606
809,806
237,011
1,460,816
9,285,450
1,686,017
634,384
226,871
2,352,672
234,822
129,168
85,254,121
SW
340,020
3,238,034
1,543,026
3,370,591
22,792,890
4,465,231
2,333,922
281,400
2,246,042
5,892,331
54,628
1,108,626
242,075
6,200,072
2,360,455
4,227,029
6,807,424
3,998,107
435,604
4,792,331
1,233,537
1,314,461
392,399
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,799
9,979,448
7,094,937
472,554
2,289,746
739,978
2,658,527
91,961
4,222,756
15,784,985
857,635
4,169,066
263,968
1,691,744
1,180,790
317,016
144,374,309
Percent of Systems
with At Least One Detection
Total
28.340%
17.614%
16.336%
65.586%
33.682%
45.346%
7.692%
78.214%
36.063%
0.125%
42.056%
1.760%
25.644%
11.208%
38.779%
33.884%
11.538%
12.139%
73.110%
46.961%
0.206%
15.201%
3.901%
8.140%
66.359%
70.725%
2.796%
11.063%
81.768%
66.769%
13.481%
9.603%
11.881%
13.061%
26.573%
3.524%
50.638%
12.857%
23.103%
26.036%
2.402%
10.833%
44.542%
7.522%
6.250%
24.209%
GW
30.612%
13.620%
16.535%
64.935%
33.250%
41.005%
6.631%
77.978%
36.398%
0.067%
47.368%
1.501%
26.328%
10.671%
38.334%
27.957%
10.394%
11.443%
74.635%
47.417%
0.209%
13.616%
3.685%
7.735%
70.000%
70.556%
2.894%
10.396%
81.752%
65.574%
11.128%
9.883%
12.000%
13.866%
24.627%
3.826%
50.446%
9.317%
22.695%
24.945%
2.405%
10.772%
44.038%
7.216%
5.490%
24.044%
SW
19.608%
32.877%
15.278%
79.167%
36.346%
57.466%
38.462%
100.000%
19.231%
0.870%
0.000%
9.091%
13.043%
18.447%
53.061%
37.584%
16.949%
22.059%
51.852%
21.154%
0.000%
42.857%
6.780%
14.388%
40.741%
81.818%
0.000%
35.135%
82.051%
85.000%
26.556%
5.600%
11.111%
9.016%
55.556%
0.000%
54.545%
15.873%
28.571%
36.000%
2.381%
11.628%
90.000%
8.075%
10.204%
26.055%
Percent of Population Served
with At Least One Detection
Total
58.648%
21.547%
16.180%
90.247%
61.672%
71.311%
51.679%
95.635%
41.965%
0.241%
83.732%
11.875%
59.193%
52.122%
56.974%
46.067%
48.915%
40.340%
44.445%
22.623%
0.541%
26.766%
11.199%
27.250%
38.932%
86.523%
2.678%
39.061%
94.160%
93.740%
17.482%
20.211%
41.134%
43.130%
31.470%
1.093%
49.957%
23.007%
39.452%
66.160%
2.487%
3.851%
78.049%
17.920%
37.751%
41.226%
GW
44.688%
10.711%
30.775%
80.259%
55.862%
53.259%
10.602%
92.551%
45.397%
0.005%
87.394%
5.261%
50.401%
20.600%
56.626%
47.799%
10.397%
12.564%
81.021%
47.023%
0.786%
31.685%
22.024%
17.762%
58.255%
72.096%
6.427%
19.241%
97.592%
79.607%
11.833%
10.483%
31.099%
13.349%
30.552%
4.679%
61.523%
5.355%
43.354%
59.681%
1.979%
5.310%
64.299%
9.340%
24.235%
40.204%
SW
67.298%
26.443%
7.575%
98.517%
65.086%
73.467%
58.407%
100.000%
19.159%
0.295%
0.000%
20.178%
88.454%
67.212%
57.361%
45.913%
58.636%
47.457%
19.912%
13.000%
0.000%
20.433%
1.126%
30.329%
22.609%
99.024%
0.000%
49.791%
76.121%
99.494%
18.174%
24.493%
47.011%
49.470%
31.686%
0.000%
20.149%
29.113%
37.157%
78.898%
2.564%
2.597%
97.171%
19.626%
43.258%
41.829%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A16c. Chromium (total) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>0.1 mg/L
Total
0
0
0
4
10
1
2
0
1
0
0
0
0
1
0
0
0
0
0
0
0
0
0
3
0
0
0
6
0
1
1
0
1
0
0
1
0
0
1
5
1
1
3
0
0
43
GW
0
0
0
4
8
0
2
0
1
0
0
0
0
1
0
0
0
0
0
0
0
0
0
3
0
0
0
6
0
1
1
0
1
0
0
1
0
0
1
3
1
0
3
0
0
37
SW
0
0
0
0
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
1
0
0
0
6
Percent of Systems
with At Least One Detection
>0.1 mg/L
Total
0.000%
0.000%
0.000%
0.381%
0.268%
0.119%
0.171%
0.000%
0.075%
0.000%
0.000%
0.000%
0.000%
0.067%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.131%
0.000%
0.000%
0.000%
0.437%
0.000%
0.308%
0.063%
0.000%
0.495%
0.000%
0.000%
0.122%
0.000%
0.000%
0.020%
0.986%
0.063%
0.167%
0.165%
0.000%
0.000%
0.088%
GW
0.000%
0.000%
0.000%
0.400%
0.250%
0.000%
0.177%
0.000%
0.077%
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.140%
0.000%
0.000%
0.000%
0.449%
0.000%
0.328%
0.075%
0.000%
0.571%
0.000%
0.000%
0.132%
0.000%
0.000%
0.022%
0.656%
0.071%
0.000%
0.166%
0.000%
0.000%
0.082%
SW
0.000%
0.000%
0.000%
0.000%
0.385%
0.452%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.000%
0.000%
2.326%
0.000%
0.000%
0.000%
0.150%
Population Served by Systems
with At Least One Detection
>0.1 mg/L
Total
0
0
0
26,656
334,074
7,124
505
0
65
0
0
0
0
60
0
0
0
0
0
0
0
0
0
1,170
0
0
0
1,355
0
200
100
0
4,056
0
0
16,197
0
0
758
319,950
34
480
3,833
0
0
716,617
GW
0
0
0
26,656
66,156
0
505
0
65
0
0
0
0
60
0
0
0
0
0
0
0
0
0
1,170
0
0
0
1,355
0
200
100
0
4,056
0
0
16,197
0
0
758
1,550
34
0
3,833
0
0
122,695
SW
0
0
0
0
267,918
7,124
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
318,400
0
480
0
0
0
593,922
Percent of Population Served
with At Least One Detection
> 0.1 mg/L
Total
0.000%
0.000%
0.000%
0.433%
0.923%
0.143%
0.019%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.017%
0.000%
0.000%
0.000%
0.017%
0.000%
0.021%
0.001%
0.000%
0.541%
0.000%
0.000%
0.467%
0.000%
0.000%
0.003%
12.578%
0.001%
0.098%
0.095%
0.000%
0.000%
0.312%
GW
0.000%
0.000%
0.000%
0.955%
0.494%
0.000%
0.132%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.068%
0.000%
0.000%
0.000%
0.050%
0.000%
0.071%
0.008%
0.000%
1.466%
0.000%
0.000%
2.000%
0.000%
0.000%
0.008%
0.092%
0.005%
0.000%
0.163%
0.000%
0.000%
0.144%
SW
0.000%
0.000%
0.000%
0.000%
1.175%
0.160%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
37.125%
0.000%
0.182%
0.000%
0.000%
0.000%
0.411%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A16d. Chromium (total) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.05 mg/L
Total
1
1
0
28
30
4
16
0
3
0
0
2
1
3
5
0
1
5
1
4
1
0
1
8
1
0
1
9
2
2
1
0
9
0
0
7
0
1
4
9
1
4
5
0
1
172
GW
1
0
0
22
23
2
16
0
3
0
0
2
1
3
5
0
0
5
1
4
1
0
1
7
1
0
1
8
2
2
1
0
7
0
0
7
0
0
4
5
1
2
5
0
1
144
SW
0
1
0
6
7
2
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
1
0
0
0
0
2
0
0
0
0
1
0
4
0
2
0
0
0
28
Percent of Systems
with At Least One Detection
> 0.05 mg/L
Total
0.202%
0.284%
0.000%
2.669%
0.805%
0.477%
1.368%
0.000%
0.225%
0.000%
0.000%
0.207%
0.112%
0.201%
0.308%
0.000%
0.148%
0.482%
0.124%
0.134%
0.069%
0.000%
0.118%
0.350%
0.461%
0.000%
0.082%
0.655%
0.276%
0.615%
0.063%
0.000%
4.455%
0.000%
0.000%
0.851%
0.000%
0.286%
0.081%
1.775%
0.063%
0.667%
0.274%
0.000%
0.329%
0.352%
GW
0.255%
0.000%
0.000%
2.198%
0.717%
0.324%
1.415%
0.000%
0.230%
0.000%
0.000%
0.214%
0.118%
0.216%
0.318%
0.000%
0.000%
0.515%
0.133%
0.136%
0.070%
0.000%
0.127%
0.326%
0.526%
0.000%
0.085%
0.598%
0.292%
0.656%
0.075%
0.000%
4.000%
0.000%
0.000%
0.923%
0.000%
0.000%
0.087%
1.094%
0.071%
0.359%
0.277%
0.000%
0.392%
0.321%
SW
0.000%
1.370%
0.000%
12.500%
1.346%
0.905%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.847%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.719%
0.000%
0.000%
0.000%
2.703%
0.000%
0.000%
0.000%
0.000%
7.407%
0.000%
0.000%
0.000%
0.000%
0.529%
0.000%
8.000%
0.000%
4.651%
0.000%
0.000%
0.000%
0.699%
Population Served by Systems
with At Least One Detection
> 0.05 mg/L
Total
96
2,400
0
2,496,990
5,198,940
53,002
13,371
0
41,226
0
0
761
116
844
79,139
0
37,615
18,754
15,000
535
233
0
80
10,121
466
0
145
739,714
5,118
960
100
0
257,518
0
0
19,187
0
4,694
157,394
326,080
34
2,215
5,586
0
200
9,488,634
GW
96
0
0
211,683
365,698
190
13,371
0
41,226
0
0
761
116
844
79,139
0
0
18,754
15,000
535
233
0
80
4,466
466
0
145
63,460
5,118
960
100
0
57,519
0
0
19,187
0
0
157,394
1,830
34
335
5,586
0
200
1,064,526
SW
0
2,400
0
2,285,307
4,833,242
52,812
0
0
0
0
0
0
0
0
0
0
37,615
0
0
0
0
0
0
5,655
0
0
0
676,254
0
0
0
0
199,999
0
0
0
0
4,694
0
324,250
0
1,880
0
0
0
8,424,108
Percent of Population Served
with At Least One Detection
> 0.05 mg/L
Total
0.017%
0.051%
0.000%
40.527%
14.368%
1.060%
0.492%
0.000%
0.240%
0.000%
0.000%
0.030%
0.011%
0.009%
1.589%
0.000%
0.441%
0.373%
2.061%
0.008%
0.006%
0.000%
0.011%
0.145%
0.083%
0.000%
0.015%
9.529%
0.307%
0.099%
0.001%
0.000%
34.369%
0.000%
0.000%
0.553%
0.000%
0.083%
0.628%
12.819%
0.001%
0.451%
0.138%
0.000%
0.045%
4.132%
GW
0.046%
0.000%
0.000%
7.585%
2.731%
0.036%
3.498%
0.000%
0.276%
0.000%
0.000%
0.055%
0.014%
0.028%
3.021%
0.000%
0.000%
1.831%
5.134%
0.028%
0.009%
0.000%
0.022%
0.261%
0.181%
0.000%
0.037%
2.328%
0.365%
0.342%
0.008%
0.000%
20.787%
0.000%
0.000%
2.369%
0.000%
0.000%
1.695%
0.109%
0.005%
0.148%
0.237%
0.000%
0.155%
1.249%
SW
0.000%
0.074%
0.000%
67.801%
21.205%
1.183%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.553%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.107%
0.000%
0.000%
0.000%
13.429%
0.000%
0.000%
0.000%
0.000%
42.323%
0.000%
0.000%
0.000%
0.000%
0.111%
0.000%
37.807%
0.000%
0.712%
0.000%
0.000%
0.000%
5.835%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A17. Cyanide — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 0.2 mg/L
>0.1 mg/L
> 0.2 mg/L
> 0.1 mg/L
>0.2 mg/L
> 0.1 mg/L
Total # Systems
Reporting
29,277
29,277
2,790
2,790
32,067
32,067
# Systems Exceeding
Threshold of Interest
39
91
5
26
44
117
% Systems Exceeding
Threshold of Interest
0.133%
0.311%
0.179%
0.932%
0.137%
0.365%
Total Pop. Served by
Systems Reporting
66,122,477
66,122,477
96,336,123
96,336,123
162,458,600
162,458,600
Total Pop. Served by
Systems Exceeding
Threshold of Interest
222,909
546,722
33,999
1,304,404
256,908
1,851,126
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.337%
0.827%
0.035%
1.354%
0.158%
1.139%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A17a. Cyanide — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
1,491
2,652
2,234
5,817
21,206
737
2,595
204
2,151
7
3,166
32
475
2,800
3,800
1,754
2,956
81
2,046
6,016
4,456
2,748
39
9,239
45
3,133
2,945
5,960
3,477
1,976
3,227
3,287
16
1,308
845
98
1,796
491
6,923
1,155
1,934
602
1,106
1,342
120,368
GW
1,063
1,833
1,576
4,579
11,890
391
1,868
201
2,082
6
3,075
23
443
2,386
3,568
529
1,996
53
1,706
6,011
4,368
2,726
28
7,796
26
3,021
2,781
5,484
3,163
1,492
2,433
2,698
12
949
614
91
635
488
5,441
961
1,596
532
424
893
93,931
SW
428
819
658
1,238
9,316
346
727
3
69
1
91
9
32
414
232
1,225
960
28
340
5
88
22
11
1,443
19
112
164
476
314
484
794
589
4
359
231
7
1,161
3
1,482
194
338
70
682
449
26,437
Percent of Samples
with Detections
Total
1.006%
1.697%
2.238%
1.014%
0.307%
4.613%
1.426%
0.490%
6.927%
0.000%
0.000%
9.375%
1.263%
1.464%
2.263%
4.333%
1.996%
25.926%
1.515%
0.050%
0.314%
0.073%
2.564%
2.316%
11.111%
0.255%
0.917%
2.869%
1.582%
0.709%
2.882%
0.913%
0.000%
0.459%
0.237%
1.020%
4.287%
0.815%
4.622%
1.039%
1.706%
2.159%
4.882%
0.373%
1.613%
GW
1.223%
1.146%
3.109%
1.157%
0.378%
5.115%
1.338%
0.498%
6.868%
0.000%
0.000%
0.000%
1.129%
1.509%
2.214%
2.457%
1.954%
37.736%
1.524%
0.050%
0.321%
0.073%
0.000%
1.911%
19.231%
0.265%
0.971%
2.936%
1.518%
0.603%
3.206%
0.815%
0.000%
0.527%
0.326%
1.099%
3.150%
0.820%
4.190%
0.937%
1.754%
2.444%
8.255%
0.560%
1.559%
SW
0.467%
2.930%
0.152%
0.485%
0.215%
4.046%
1.651%
0.000%
8.696%
0.000%
0.000%
33.333%
3.125%
1.208%
3.017%
5.143%
2.083%
3.571%
1.471%
0.000%
0.000%
0.000%
9.091%
4.505%
0.000%
0.000%
0.000%
2.101%
2.229%
1.033%
1.889%
1.358%
0.000%
0.279%
0.000%
0.000%
4.910%
0.000%
6.208%
1.546%
1.479%
0.000%
2.786%
0.000%
1.808%
Minimum Detect
Concentration (mg/L)
Total
0.0058
0.001
0.05
0.005
0.0011
0.0061
0.01
0.008
0.001
0.01
0.006
0.005
0.0009
0.001
0.004
0.001
0.005
0.005
0.1
0.16
0.01
0.002
0.005
0.08
0.00314
0.001
0.0039
0.005
0.0009
0.005
0.0055
0.01
0.005
0.002
0.01
0.001
0.006
0.003
0.001
0.002
0.0026
0.0009
GW
0.0058
0.003
0.05
0.005
0.0011
0.007
0.01
0.008
0.001
0.006
0.005
0.0009
0.001
0.01
0.001
0.005
0.005
0.1
0.16
0.002
0.005
0.08
0.00314
0.001
0.0039
0.005
0.0009
0.005
0.009
0.01
0.005
0.002
0.01
0.0012
0.006
0.003
0.001
0.002
0.0026
0.0009
SW
0.006
0.001
0.2
0.008
0.002
0.0061
0.01
0.003
0.01
0.007
0.01
0.009
0.002
0.004
0.04
0.005
0.01
0.002
0.002
0.006
0.01
0.002
0.005
0.0055
0.002
0.001
0.01
0.01
0.002
0.001
Median Detect
Concentration (mg/L)
Total
0.0078
0.02
0.18
0.01
0.04
0.01
0.01
0.008
0.005
0.01
0.01
0.01
0.01
0.01
0.02
0.01
0.006
0.005
0.16
0.185
0.01
0.005
0.005
0.16
0.01
0.004
0.17
0.01
0.003
0.01
0.02
0.015
0.005
0.0053
0.01
0.003
0.01
0.01
0.005
0.007
0.01
0.0089
GW
0.0078
0.02
0.18
0.01
0.09
0.01
0.01
0.008
0.005
0.01
0.01
0.01
0.02
0.02
0.01
0.0075
0.005
0.16
0.185
0.005
0.005
0.16
0.01
0.004
0.165
0.02
0.002
0.0095
0.02
0.015
0.005
0.00545
0.01
0.004
0.01
0.01
0.005
0.007
0.01
0.009
SW
0.103
0.02
0.2
0.045
0.02
0.015
0.065
0.0055
0.01
0.007
0.01
0.05
0.01
0.01
0.04
0.005
0.01
0.004
0.0045
0.19
0.01
0.01
0.015
0.0055
0.005
0.002
0.01
0.01
0.007
0.0085
90th Percentile Detect
Concentration (mg/L)
Total
0.1
0.09
0.58
0.08
0.1
0.04
0.15
0.008
0.01
0.03
0.03
0.07
0.05
0.03
0.05
0.01
0.01
0.15
0.4
0.21
0.01
0.03
0.01
0.34
0.23
0.02
0.79
0.07
0.03
0.02
1.88
0.02
0.005
0.02
0.02
0.01
0.04
0.02
0.01
0.04
1.93
0.08
GW
0.02
0.06
0.58
0.05
0.1
0.02
0.15
0.008
0.01
0.03
0.07
0.03
0.03
0.05
0.01
0.02
0.15
0.4
0.21
0.03
0.01
0.34
0.23
0.02
0.79
0.07
0.03
0.02
1.88
0.02
0.005
0.015
0.02
0.02
0.07
0.05
0.01
0.04
1.93
0.1
SW
0.2
0.2
0.2
0.1
0.105
0.15
0.1
0.01
0.03
0.007
0.03
0.09
0.03
0.02
0.04
0.01
0.01
0.04
0.02
1.88
0.11
0.1
0.04
0.0055
0.02
0.01
0.03
0.02
0.04
0.05
Maximum Detect
Concentration (mg/L)
Total
0.2
0.33
0.96
0.24
0.22
0.2
0.26
0.008
0.2
0.03
0.03
0.2
0.11
0.57
0.07
0.04
0.02
0.15
1.59
0.21
0.01
0.18
0.01
0.34
1.6
0.14
1.88
0.11
0.3
0.04
1.88
0.02
0.005
0.08
0.02
0.28
0.07
0.2
0.03
0.1
1.93
1.93
GW
0.1
0.33
0.96
0.24
0.22
0.04
0.26
0.008
0.2
0.03
0.2
0.11
0.06
0.07
0.01
0.02
0.15
1.59
0.21
0.18
0.01
0.34
1.6
0.14
1.88
0.07
0.3
0.03
1.88
0.02
0.005
0.02
0.02
0.08
0.07
0.2
0.03
0.07
1.93
1.93
SW
0.2
0.3
0.2
0.1
0.17
0.2
0.17
0.01
0.03
0.007
0.03
0.09
0.57
0.02
0.04
0.01
0.01
0.18
0.02
1.88
0.11
0.14
0.04
0.0055
0.08
0.28
0.03
0.02
0.1
1.88
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A17b. Cyanide — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
609
352
453
1,047
1,801
318
1,169
112
1,336
6
112
15
273
1,231
1,543
242
676
47
789
2,739
1,593
989
29
2,284
26
745
1,218
1,359
712
335
1,532
1,892
11
727
141
29
351
420
507
690
600
250
453
304
32,067
GW
467
279
381
999
1,479
198
1,130
111
1,310
5
100
14
261
1,130
1,500
93
558
37
735
2,735
1,564
979
24
2,145
20
734
1,177
1,324
674
314
1,296
1,767
7
606
132
26
162
418
457
594
556
232
292
255
29,277
SW
142
73
72
48
322
120
39
1
26
1
12
1
12
101
43
149
118
10
54
4
29
10
5
139
6
11
41
35
38
21
236
125
4
121
9
3
189
2
50
96
44
18
161
49
2,790
Total Population Served by Systems
Reporting
Total
568,407
4,701,100
2,452,800
6,145,727
34,623,489
3,180,552
2,716,062
229,152
17,258,004
46,526
1,305,882
176,854
776,003
9,073,158
4,582,001
4,602,489
8,521,949
345,679
726,469
967,203
4,265,262
994,458
87,746
6,973,608
63,288
1,450,799
942,646
7,013,180
1,671,607
973,342
4,371,133
10,214,857
77,209
2,769,817
913,234
31,974
5,685,258
530,258
2,543,652
2,788,445
492,901
2,742,526
1,415,710
446,184
162,458,600
GW
230,700
1,463,066
909,774
2,775,136
12,638,467
240,188
382,140
89,152
15,011,962
43,855
1,251,254
42,237
556,213
2,873,930
2,258,101
375,460
1,714,525
150,329
290,865
907,315
3,015,621
920,265
12,156
1,708,442
56,259
674,319
392,847
2,687,928
1,405,084
283,451
1,200,988
3,119,920
2,175
486,571
173,256
26,332
1,462,502
527,971
1,686,017
362,621
226,733
1,122,262
234,920
129,168
66,122,477
SW
337,707
3,238,034
1,543,026
3,370,591
21,985,022
2,940,364
2,333,922
140,000
2,246,042
2,671
54,628
134,617
219,790
6,199,228
2,323,900
4,227,029
6,807,424
195,350
435,604
59,888
1,249,641
74,193
75,590
5,265,166
7,029
776,480
549,799
4,325,252
266,523
689,891
3,170,145
7,094,937
75,034
2,283,246
739,978
5,642
4,222,756
2,287
857,635
2,425,824
266,168
1,620,264
1,180,790
317,016
96,336,123
Percent of Systems
with At Least One Detection
Total
2.463%
7.955%
2.428%
4.680%
2.277%
8.491%
2.652%
0.893%
6.961%
0.000%
0.000%
6.667%
2.198%
3.168%
5.250%
23.967%
5.917%
38.298%
3.929%
0.110%
0.753%
0.202%
3.448%
6.611%
19.231%
0.537%
2.053%
8.830%
5.899%
3.582%
6.070%
1.533%
0.000%
0.825%
1.418%
3.448%
17.379%
0.714%
17.357%
1.739%
4.500%
4.400%
9.713%
1.645%
4.144%
GW
2.784%
5.376%
2.625%
4.605%
1.758%
7.071%
2.212%
0.901%
6.870%
0.000%
0.000%
0.000%
1.916%
3.097%
5.067%
12.903%
5.018%
45.946%
3.537%
0.110%
0.767%
0.204%
0.000%
5.315%
25.000%
0.545%
2.124%
8.535%
5.638%
2.548%
6.019%
1.188%
0.000%
0.825%
1.515%
3.846%
10.494%
0.718%
15.755%
1.515%
4.137%
4.741%
10.959%
1.961%
3.559%
SW
1.408%
17.808%
1.389%
6.250%
4.658%
10.833%
15.385%
0.000%
11.538%
0.000%
0.000%
100.000%
8.333%
3.960%
11.628%
30.872%
10.169%
10.000%
9.259%
0.000%
0.000%
0.000%
20.000%
26.619%
0.000%
0.000%
0.000%
20.000%
10.526%
19.048%
6.356%
6.400%
0.000%
0.826%
0.000%
0.000%
23.280%
0.000%
32.000%
3.125%
9.091%
0.000%
7.453%
0.000%
10.287%
Percent of Population Served
with At Least One Detection
Total
2.871%
31.047%
0.676%
40.905%
4.500%
52.182%
19.305%
0.058%
35.735%
0.000%
0.000%
76.118%
24.559%
1.834%
33.062%
29.176%
47.502%
12.499%
9.624%
0.044%
0.694%
0.049%
0.097%
22.769%
1.139%
0.025%
0.878%
13.490%
12.351%
38.089%
6.991%
4.037%
0.000%
1.143%
0.514%
6.474%
25.967%
0.634%
42.914%
10.851%
3.362%
1.886%
2.563%
0.354%
17.428%
GW
2.420%
12.510%
1.071%
30.273%
4.833%
16.776%
1.258%
0.148%
38.535%
0.000%
0.000%
0.000%
0.823%
4.601%
15.284%
5.821%
7.885%
7.481%
8.736%
0.047%
0.981%
0.052%
0.000%
7.665%
1.282%
0.053%
2.107%
18.748%
5.775%
6.901%
5.799%
2.527%
0.000%
3.240%
2.710%
7.861%
3.829%
0.637%
29.652%
0.989%
4.474%
4.610%
6.867%
1.222%
14.736%
SW
3.180%
39.423%
0.443%
49.658%
4.308%
55.075%
22.259%
0.000%
17.019%
0.000%
0.000%
100.000%
84.626%
0.551%
50.336%
31.250%
57.480%
16.360%
10.218%
0.000%
0.000%
0.000%
0.112%
27.669%
0.000%
0.000%
0.000%
10.222%
47.024%
50.902%
7.443%
4.701%
0.000%
0.696%
0.000%
0.000%
33.635%
0.000%
68.986%
12.326%
2.414%
0.000%
1.707%
0.000%
19.276%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A17c. Cyanide — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>0.2 mg/L
Total
0
2
7
2
1
0
1
0
0
0
0
0
0
0
0
1
0
0
0
0
2
1
0
0
0
1
3
0
18
0
2
0
0
1
0
0
0
0
1
0
0
0
0
1
44
GW
0
1
7
2
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
2
1
0
0
0
1
3
0
16
0
2
0
0
1
0
0
0
0
0
0
0
0
0
1
39
SW
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
5
Percent of Systems
with At Least One Detection
> 0.2 mg/L
Total
0.000%
0.568%
1.545%
0.191%
0.056%
0.000%
0.086%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.413%
0.000%
0.000%
0.000%
0.000%
0.126%
0.101%
0.000%
0.000%
0.000%
0.134%
0.246%
0.000%
2.528%
0.000%
0.131%
0.000%
0.000%
0.138%
0.000%
0.000%
0.000%
0.000%
0.197%
0.000%
0.000%
0.000%
0.000%
0.329%
0.137%
GW
0.000%
0.358%
1.837%
0.200%
0.068%
0.000%
0.088%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.128%
0.102%
0.000%
0.000%
0.000%
0.136%
0.255%
0.000%
2.374%
0.000%
0.154%
0.000%
0.000%
0.165%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.392%
0.133%
SW
0.000%
1.370%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.263%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.179%
Population Served by Systems
with At Least One Detection
> 0.2 mg/L
Total
0
105,803
3,906
47,633
3,100
0
500
0
0
0
0
0
0
0
0
7,716
0
0
0
0
5,552
450
0
0
0
29
1,632
0
68,241
0
1,867
0
0
70
0
0
0
0
10,229
0
0
0
0
180
256,908
GW
0
93,078
3,906
47,633
3,100
0
500
0
0
0
0
0
0
0
0
0
0
0
0
0
5,552
450
0
0
0
29
1,632
0
64,912
0
1,867
0
0
70
0
0
0
0
0
0
0
0
0
180
222,909
SW
0
12,725
0
0
0
0
0
0
0
0
0
0
0
0
0
7,716
0
0
0
0
0
0
0
0
0
0
0
0
3,329
0
0
0
0
0
0
0
0
0
10,229
0
0
0
0
0
33,999
Percent of Population Served
with At Least One Detection
> 0.2 mg/L
Total
0.000%
2.251%
0.159%
0.775%
0.009%
0.000%
0.018%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.168%
0.000%
0.000%
0.000%
0.000%
0.130%
0.045%
0.000%
0.000%
0.000%
0.002%
0.173%
0.000%
4.082%
0.000%
0.043%
0.000%
0.000%
0.003%
0.000%
0.000%
0.000%
0.000%
0.402%
0.000%
0.000%
0.000%
0.000%
0.040%
0.158%
GW
0.000%
6.362%
0.429%
1.716%
0.025%
0.000%
0.131%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.184%
0.049%
0.000%
0.000%
0.000%
0.004%
0.415%
0.000%
4.620%
0.000%
0.155%
0.000%
0.000%
0.014%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.139%
0.337%
SW
0.000%
0.393%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.183%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.249%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.193%
0.000%
0.000%
0.000%
0.000%
0.000%
0.035%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A17d. Cyanide — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>0.1 mg/L
Total
2
3
8
5
12
2
5
0
3
0
0
0
0
2
1
3
0
0
0
1
12
2
0
4
0
3
4
2
30
1
5
0
0
2
0
0
0
0
1
0
1
0
1
2
117
GW
1
1
7
4
8
0
3
0
3
0
0
0
0
2
1
0
0
0
0
1
12
2
0
2
0
3
4
2
27
0
3
0
0
2
0
0
0
0
0
0
1
0
0
2
91
SW
1
2
1
1
4
2
2
0
0
0
0
0
0
0
0
3
0
0
0
0
0
0
0
2
0
0
0
0
3
1
2
0
0
0
0
0
0
0
1
0
0
0
1
0
26
Percent of Systems
with At Least One Detection
>0.1 mg/L
Total
0.328%
0.852%
1.766%
0.478%
0.666%
0.629%
0.428%
0.000%
0.225%
0.000%
0.000%
0.000%
0.000%
0.162%
0.065%
1.240%
0.000%
0.000%
0.000%
0.037%
0.753%
0.202%
0.000%
0.175%
0.000%
0.403%
0.328%
0.147%
4.213%
0.299%
0.326%
0.000%
0.000%
0.275%
0.000%
0.000%
0.000%
0.000%
0.197%
0.000%
0.167%
0.000%
0.221%
0.658%
0.365%
GW
0.214%
0.358%
1.837%
0.400%
0.541%
0.000%
0.265%
0.000%
0.229%
0.000%
0.000%
0.000%
0.000%
0.177%
0.067%
0.000%
0.000%
0.000%
0.000%
0.037%
0.767%
0.204%
0.000%
0.093%
0.000%
0.409%
0.340%
0.151%
4.006%
0.000%
0.231%
0.000%
0.000%
0.330%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.180%
0.000%
0.000%
0.784%
0.311%
SW
0.704%
2.740%
1.389%
2.083%
1.242%
1.667%
5.128%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.013%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.439%
0.000%
0.000%
0.000%
0.000%
7.895%
4.762%
0.847%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.000%
0.000%
0.000%
0.000%
0.621%
0.000%
0.932%
Population Served by Systems
with At Least One Detection
>0.1 mg/L
Total
10,194
328,201
10,734
188,199
757,492
36,237
88,731
0
53,652
0
0
0
0
1,160
70
98,525
0
0
0
30
29,582
483
0
30,104
0
162
1,795
300
154,053
15,200
33,121
0
0
492
0
0
0
0
10,229
0
200
0
1,800
380
1,851,126
GW
47
93,078
3,906
48,199
218,449
0
585
0
53,652
0
0
0
0
1,160
70
0
0
0
0
30
29,582
483
0
13,062
0
162
1,795
300
78,023
0
3,067
0
0
492
0
0
0
0
0
0
200
0
0
380
546,722
SW
10,147
235,123
6,828
140,000
539,043
36,237
88,146
0
0
0
0
0
0
0
0
98,525
0
0
0
0
0
0
0
17,042
0
0
0
0
76,030
15,200
30,054
0
0
0
0
0
0
0
10,229
0
0
0
1,800
0
1,304,404
Percent of Population Served
with At Least One Detection
> 0.1 mg/L
Total
1.793%
6.981%
0.438%
3.062%
2.188%
1.139%
3.267%
0.000%
0.311%
0.000%
0.000%
0.000%
0.000%
0.013%
0.002%
2.141%
0.000%
0.000%
0.000%
0.003%
0.694%
0.049%
0.000%
0.432%
0.000%
0.011%
0.190%
0.004%
9.216%
1.562%
0.758%
0.000%
0.000%
0.018%
0.000%
0.000%
0.000%
0.000%
0.402%
0.000%
0.041%
0.000%
0.127%
0.085%
1.139%
GW
0.020%
6.362%
0.429%
1.737%
1.728%
0.000%
0.153%
0.000%
0.357%
0.000%
0.000%
0.000%
0.000%
0.040%
0.003%
0.000%
0.000%
0.000%
0.000%
0.003%
0.981%
0.052%
0.000%
0.765%
0.000%
0.024%
0.457%
0.011%
5.553%
0.000%
0.255%
0.000%
0.000%
0.101%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.088%
0.000%
0.000%
0.294%
0.827%
SW
3.005%
7.261%
0.443%
4.154%
2.452%
1.232%
3.777%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.331%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.324%
0.000%
0.000%
0.000%
0.000%
28.527%
2.203%
0.948%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.193%
0.000%
0.000%
0.000%
0.152%
0.000%
1.354%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A18. Dalapon —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 200 ug/L
> 100 ug/L
> 200 ug/L
> 100 ug/L
> 200 ug/L
> 100 ug/L
Total # Systems
Reporting
25,558
25,558
2,829
2,829
28,387
28,387
# Systems Exceeding
Threshold of Interest
1
1
0
0
1
1
% Systems Exceeding
Threshold of Interest
0.004%
0.004%
0.000%
0.000%
0.004%
0.004%
Total Pop. Served by
Systems Reporting
64,625,469
64,625,469
113,560,642
113,560,642
178,186,111
178,186,111
Total Pop. Served by
Systems Exceeding
Threshold of Interest
20,114
20,114
0
0
20,114
20,114
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.031%
0.031%
0.000%
0.000%
0.011%
0.011%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A18a. Dalapon —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
69
617
1,588
6,851
13,777
2,550
1,317
826
2,510
1,433
1,746
2,036
3,191
2,324
1,780
2,989
2,468
378
3,939
4,586
5,797
3,187
13,980
444
2,220
3
4,174
1,584
2,873
145
2,057
627
2,545
952
62
2,174
7,082
442
41
3,161
645
1,253
112,423
GW
36
408
1,357
5,425
8,242
1,857
1,002
788
2,442
1,355
1,606
1,767
2,642
2,154
444
2,186
1,697
317
1,404
4,452
4,978
2,905
12,737
371
2,143
3
3,941
1,162
2,162
55
1,571
413
2,255
842
12
1,343
5,899
148
40
3,069
338
940
88,908
SW
33
209
231
1,426
5,535
693
315
38
68
78
140
269
549
170
1,336
803
771
61
2,535
134
819
282
1,243
73
77
0
233
422
711
90
486
214
290
110
50
831
1,183
294
1
92
307
313
23,515
Percent of Samples
with Detections
Total
0.000%
0.648%
0.000%
0.204%
0.051%
0.510%
0.304%
0.000%
4.661%
0.000%
0.401%
0.098%
0.000%
0.430%
2.247%
0.234%
9.198%
0.265%
0.609%
0.981%
0.242%
0.157%
3.505%
7.207%
0.135%
0.000%
0.048%
0.126%
0.139%
0.690%
0.097%
0.000%
0.039%
0.000%
4.839%
0.000%
0.000%
0.000%
0.000%
0.158%
1.860%
0.160%
0.978%
GW
0.000%
0.490%
0.000%
0.111%
0.036%
0.323%
0.200%
0.000%
4.750%
0.000%
0.062%
0.113%
0.000%
0.279%
0.000%
0.137%
4.302%
0.000%
0.071%
0.809%
0.281%
0.069%
2.599%
6.469%
0.140%
0.000%
0.025%
0.172%
0.139%
0.000%
0.000%
0.000%
0.044%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.163%
2.367%
0.106%
0.733%
SW
0.000%
0.957%
0.000%
0.561%
0.072%
1.010%
0.635%
0.000%
1.471%
0.000%
4.286%
0.000%
0.000%
2.353%
2.994%
0.498%
19.974%
1.639%
0.907%
6.716%
0.000%
1.064%
12.792%
10.959%
0.000%
0.000%
0.429%
0.000%
0.141%
1.111%
0.412%
0.000%
0.000%
0.000%
6.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.303%
0.319%
1.905%
Minimum Detect
Concentration (u.g/L)
Total
0.4
0.3
0.04
1
0.2
0.01
0.33
0.12
1
0.04
0.5
0.01
5.1
1
0.5
1.03
1.52
0.73
1.04
2.09
2.1
1.4
0.18
19.1
4
24
1.6
0.23
0.06
2
0.01
GW
0.4
0.3
1
1
0.2
0.01
0.33
0.12
1
1
0.01
3
0.5
1.03
1.52
0.73
1.04
2.09
2.1
1.4
3
24
0.23
0.06
10
0.01
SW
1.2
1
0.04
1.7
3.8
0.33
0.35
1
0.04
0.5
0.05
5.1
1
0.5
2.82
1
1.11
4
0.18
19.1
4
1.6
0.06
2
0.04
Median Detect
Concentration (u.g/L)
Total
4.25
1
1.9
2.7
2.9
1.8
0.68
0.305
1.8
1.3
1
0.56
5.1
2
0.7
2.965
2.82
1.9
1.885
2.35
3.05
1.4
16.5
19.1
15
24
2
0.5
0.07
6
1.6
GW
3.85
1
1
2.8
1.1
1.85
0.33
0.305
2.2
1
0.3
3
0.7
2.965
2.01
2.1
1.95
2.35
2.1
1.4
30
24
0.5
0.07
10
1.7
SW
18.75
1.2
1.95
2.6
3.9
0.33
0.94
1.55
1.3
1
0.68
5.1
2
0.7
3.3
1.7
1.66
4
0.18
19.1
15
2
0.28
2
1.4
90th Percentile Detect
Concentration (u.g/L)
Total
36.3
1.6
19
8.1
4
5.4
1.7
0.49
50.9
6.8
2.2
1.89
5.1
2
1.1
29.5
3.5
6.75
3.14
8.7
4
1.4
51
19.1
26
24
83
1.3
1
10
5
GW
7.3
1
10
8.1
2
5.4
0.33
0.49
98
2.2
1.34
3
1.2
29.5
2.5
9.2
3.19
8.7
2.1
1.4
51
24
1.3
1
10
6.6
SW
36.3
1.7
19
46
4
0.33
1.7
2.2
6.8
1.7
2.29
5.1
2
1
3.5
3.4
2.84
4
0.18
19.1
26
83
1
2
3.2
Maximum Detect
Concentration (u.g/L)
Total
36.3
1.7
19
46
4
33
1.7
0.49
98
10
2.2
5.24
5.1
3
2
1210
3.5
63
3.55
8.7
4
1.4
51
19.1
26
24
83
1.3
1
10
1210
GW
7.3
1
10
8.1
2
33
0.33
0.49
98
2.2
2.43
3
2
1210
2.5
63
3.55
8.7
2.1
1.4
51
24
1.3
1
10
1210
SW
36.3
1.7
19
46
4
0.33
1.7
2.2
10
1.7
5.24
5.1
3
1
3.5
21
2.84
4
0.18
19.1
26
83
1
2
83
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A18b. Dalapon — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
18
184
454
917
1,580
816
652
254
1,329
297
1,056
857
1,121
1,404
241
645
862
216
511
1,281
1,475
846
2,365
209
739
2
673
287
1,345
37
1,086
88
728
260
11
856
426
173
34
1,406
342
304
28,387
GW
13
128
382
869
1,259
597
615
251
1,307
283
1,023
804
1,020
1,360
92
528
794
190
458
1,252
1,398
786
2,228
182
728
2
639
266
1,115
28
936
79
676
239
5
702
389
63
33
1,386
197
256
25,558
SW
5
56
72
48
321
219
37
3
22
14
33
53
101
44
149
117
68
26
53
29
77
60
137
27
11
0
34
21
230
9
150
9
52
21
6
154
37
110
1
20
145
48
2,829
Total Population Served by Systems
Reporting
Total
316,254
2,877,453
2,453,348
6,033,847
33,369,613
4,994,023
2,588,913
624,615
16,800,741
997,274
2,543,237
1,052,182
9,097,009
4,871,546
4,596,328
8,509,903
4,906,001
491,237
5,833,684
3,931,386
3,281,888
757,811
6,885,177
559,198
1,454,673
8,623
1,652,427
960,268
4,923,849
3,029,193
2,937,289
900,541
3,300,197
622,152
648,720
18,700,247
2,500,671
2,380,983
96,146
3,883,613
1,367,674
446,177
178,186,111
GW
84,804
597,317
910,322
2,663,256
12,021,601
527,114
261,646
343,215
14,558,736
305,252
1,434,611
802,078
2,901,087
2,551,810
369,299
1,707,521
907,894
116,848
1,208,759
2,681,745
1,700,557
365,142
1,733,551
253,973
678,193
8,623
1,391,779
270,377
982,159
99,582
572,539
160,563
782,848
262,981
144,963
4,013,688
1,667,485
26,904
27,223
2,191,869
206,326
129,229
64,625,469
SW
231,450
2,280,136
1,543,026
3,370,591
21,348,012
4,466,909
2,327,267
281,400
2,242,005
692,022
1,108,626
250,104
6,195,922
2,319,736
4,227,029
6,802,382
3,998,107
374,389
4,624,925
1,249,641
1,581,331
392,669
5,151,626
305,225
776,480
0
260,648
689,891
3,941,690
2,929,611
2,364,750
739,978
2,517,349
359,171
503,757
14,686,559
833,186
2,354,079
68,923
1,691,744
1,161,348
316,948
113,560,642
Percent of Systems
with At Least One Detection
Total
0.000%
2.174%
0.000%
0.763%
0.316%
0.858%
0.460%
0.000%
3.988%
0.000%
0.473%
0.117%
0.000%
0.499%
8.714%
0.930%
12.761%
0.463%
1.566%
2.030%
0.678%
0.473%
8.203%
7.656%
0.406%
0.000%
0.297%
0.697%
0.223%
2.703%
0.092%
0.000%
0.137%
0.000%
18.182%
0.000%
0.000%
0.000%
0.000%
0.284%
2.924%
0.658%
1.828%
GW
0.000%
1.563%
0.000%
0.345%
0.159%
0.670%
0.325%
0.000%
3.979%
0.000%
0.098%
0.124%
0.000%
0.368%
0.000%
0.568%
8.690%
0.000%
0.218%
1.757%
0.715%
0.254%
7.451%
4.945%
0.412%
0.000%
0.156%
0.752%
0.179%
0.000%
0.000%
0.000%
0.148%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.289%
4.061%
0.391%
1.471%
SW
0.000%
3.571%
0.000%
8.333%
0.935%
1.370%
2.703%
0.000%
4.545%
0.000%
12.121%
0.000%
0.000%
4.545%
14.094%
2.564%
60.294%
3.846%
13.208%
13.793%
0.000%
3.333%
20.438%
25.926%
0.000%
0.000%
2.941%
0.000%
0.435%
11.111%
0.667%
0.000%
0.000%
0.000%
33.333%
0.000%
0.000%
0.000%
0.000%
0.000%
1.379%
2.083%
5.055%
Percent of Population Served
with At Least One Detection
Total
0.000%
1.789%
0.000%
18.957%
1.578%
0.082%
2.488%
0.000%
17.841%
0.000%
5.780%
0.005%
0.000%
3.867%
23.025%
1.604%
83.252%
0.578%
2.448%
3.356%
0.851%
0.075%
36.942%
12.899%
0.561%
0.000%
0.009%
0.034%
0.350%
0.599%
0.006%
0.000%
0.002%
0.000%
28.360%
0.000%
0.000%
0.000%
0.000%
0.325%
0.576%
2.270%
7.623%
GW
0.000%
0.437%
0.000%
3.534%
0.117%
0.112%
0.185%
0.000%
19.502%
0.000%
0.014%
0.007%
0.000%
0.449%
0.000%
1.395%
14.136%
0.000%
0.984%
4.099%
1.642%
0.068%
39.471%
3.046%
1.203%
0.000%
0.008%
0.120%
0.579%
0.000%
0.000%
0.000%
0.009%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.575%
0.827%
0.542%
6.168%
SW
0.000%
2.144%
0.000%
31.144%
2.401%
0.078%
2.747%
0.000%
7.059%
0.000%
13.241%
0.000%
0.000%
7.628%
25.036%
1.656%
98.947%
0.759%
2.830%
1.761%
0.000%
0.080%
36.091%
21.098%
0.000%
0.000%
0.012%
0.000%
0.293%
0.619%
0.007%
0.000%
0.000%
0.000%
36.521%
0.000%
0.000%
0.000%
0.000%
0.000%
0.532%
2.975%
8.451%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A18c. Dalapon —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 200 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 200 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.068%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 200 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
20,114
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
20,114
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
20,114
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
20,114
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 200 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.613%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.011%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.183%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.031%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A18d. Dalapon — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 100 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 100 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.068%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 100 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
20,114
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
20,114
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
20,114
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
20,114
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 100 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.613%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.011%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.183%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.031%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A19. Di(2-ethlyhexyl)adipate (DEHA) -Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 400 ug/L
> 200 ug/L
> 400 ug/L
> 200 ug/L
> 400 ug/L
> 200 ug/L
Total # Systems
Reporting
25,891
25,891
3,011
3,011
28,902
28,902
# Systems Exceeding
Threshold of Interest
2
7
0
0
2
7
% Systems Exceeding
Threshold of Interest
0.008%
0.027%
0.000%
0.000%
0.007%
0.024%
Total Pop. Served by
Systems Reporting
65,031,810
65,031,810
119,102,864
119,102,864
184,134,674
184,134,674
Total Pop. Served by
Systems Exceeding
Threshold of Interest
22,913
24,953
0
0
22,913
24,953
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.035%
0.038%
0.000%
0.000%
0.012%
0.014%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A19a. Di(2-ethlyhexyl)adipate (DEHA) -Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
50
746
2,241
7,000
12,867
2,541
1,320
1,084
2,476
1,469
1,757
2,718
3,857
2,299
2,186
3,074
2,816
456
309
4,761
324
2,990
13,804
65
4,480
4,194
40
4,565
1,610
2,781
886
2,054
916
2,966
956
63
10,273
7,096
495
1,321
1,965
642
1,279
121,792
GW
16
492
1,923
5,461
7,353
1,834
1,010
1,054
2,407
1,389
1,627
2,424
3,106
2,101
571
2,260
1,729
391
181
4,620
194
2,692
12,708
42
4,131
3,874
33
4,302
1,180
2,055
641
1,570
624
2,572
847
10
4,527
5,913
181
1,120
1,888
335
963
94,351
SW
34
254
318
1,539
5,514
707
310
30
69
80
130
294
751
198
1,615
814
1,087
65
128
141
130
298
1,096
23
349
320
7
263
430
726
245
484
292
394
109
53
5,746
1,183
314
201
77
307
316
27,441
Percent of Samples
with Detections
Total
4.000%
0.536%
0.312%
0.086%
0.078%
0.630%
1.288%
0.092%
0.727%
0.000%
0.512%
0.074%
0.000%
0.391%
0.457%
1.952%
3.693%
0.219%
0.647%
0.084%
0.000%
0.201%
1.681%
0.000%
0.134%
0.072%
10.000%
3.067%
0.124%
0.108%
0.226%
0.000%
0.437%
0.169%
0.000%
1.587%
0.195%
0.296%
0.404%
0.227%
0.254%
1.869%
0.469%
0.623%
GW
0.000%
0.000%
0.364%
0.110%
0.122%
0.763%
1.683%
0.095%
0.748%
0.000%
0.553%
0.083%
0.000%
0.428%
0.175%
1.372%
2.140%
0.000%
0.552%
0.087%
0.000%
0.223%
1.660%
0.000%
0.121%
0.052%
12.121%
3.208%
0.085%
0.000%
0.312%
0.000%
0.641%
0.194%
0.000%
0.000%
0.110%
0.321%
1.105%
0.268%
0.265%
2.388%
0.623%
0.627%
SW
5.882%
1.575%
0.000%
0.000%
0.018%
0.283%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.557%
3.563%
6.164%
1.538%
0.781%
0.000%
0.000%
0.000%
1.916%
0.000%
0.287%
0.313%
0.000%
0.760%
0.233%
0.413%
0.000%
0.000%
0.000%
0.000%
0.000%
1.887%
0.261%
0.169%
0.000%
0.000%
0.000%
1.303%
0.000%
0.609%
Minimum Detect
Concentration (u.g/L)
Total
0.17
0.13
0.8
0.87
0.23
0.16
1
2
0.01
0.6
4.6
0.37
0.5
0.4
0.03
0.19
1.2
7.1
0.51
0.11
0.57
0.6
0.02
0.01
2.6
0.63
0.8
3.2
0.64
0.6
2.29
0.09
0.4
0.3
0.7
0.02
0.5
0.01
GW
0.8
0.87
0.23
0.16
1
2
0.01
0.6
4.6
0.37
1300
0.48
0.5
2.2
7.1
0.51
0.11
0.57
0.6
0.02
0.01
2.6
0.8
3.2
0.64
2.59
0.09
0.4
0.3
0.7
0.15
0.5
0.01
SW
0.17
0.13
7.4
0.84
0.5
0.4
0.03
0.19
1.2
0.65
4.81
4.4
1.12
5.43
0.63
0.6
2.29
0.1
0.02
0.02
Median Detect
Concentration (u.g/L)
Total
0.24
2.75
1.62
0.87
1.1
0.95
1
2
0.01
1.7
5.5
0.84
0.95
0.815
0.7
0.19
1.7
7.95
0.835
1.025
1.62
2.3
0.07
0.39
4.015
1.4
1.24
4
0.74
0.6
2.77
0.6
0.65
1.18
40
0.15
0.745
0.91
GW
1.62
0.87
1.1
0.95
1
2
0.01
1.7
5.5
0.84
1300
0.83
0.6
2.2
7.95
0.835
1.02
0.94
1.45
0.07
0.29
2.6
1.24
4
0.74
3.32
0.6
0.65
1.18
40
0.175
0.745
0.935
SW
0.24
2.75
7.4
2.47
0.6
0.8
0.7
0.19
1.2
1.26
4.81
4.4
1.17
5.43
1.4
0.6
2.75
0.35
0.15
0.8
90th Percentile Detect
Concentration (u.g/L)
Total
0.31
43.7
3.24
3
7.65
2.4
1.32
2
0.48
88
6.4
7
655
2.115
1.9
0.19
2.2
11
7.4
2.58
5.6
4.4
0.26
107
5.43
2
1.68
52
1.42
0.6
4.84
3.3
0.9
4.91
40
0.2
0.9
8.2
GW
3.24
3
7.9
1.8
1.32
2
0.48
88
6.4
7
1300
1.73
1.7
2.2
11
7.4
2.47
5.6
2.3
0.26
107
2.6
1.68
52
1.42
4.87
3.3
0.9
4.91
40
0.2
0.9
15.13
SW
0.31
43.7
7.4
4.1
10
3.15
2.1
0.19
1.2
3.57
4.81
4.4
1.22
5.43
2
0.6
3.93
0.6
0.5
4.1
Maximum Detect
Concentration (u.g/L)
Total
0.31
43.7
3.24
3
7.9
4.1
1.32
2
1.1
88
6.4
7
1300
5
25.3
0.19
2.2
11
7.4
17
5.6
4.4
0.26
1000
5.43
2
1.68
52
1.42
0.6
4.87
4.4
0.9
4.91
40
0.5
0.9
1300
GW
3.24
3
7.9
2.4
1.32
2
1.1
88
6.4
7
1300
5
6.9
2.2
11
7.4
17
5.6
2.3
0.26
1000
2.6
1.68
52
1.42
4.87
4.4
0.9
4.91
40
0.2
0.9
1300
SW
0.31
43.7
7.4
4.1
10
4.9
25.3
0.19
1.2
5.08
4.81
4.4
1.22
5.43
2
0.6
4.81
0.6
0.5
43.7
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A19b. Di(2-ethlyhexyl)adipate (DEHA) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
11
187
454
931
1,271
799
651
231
1,334
287
1,056
915
1,085
1,401
242
642
862
269
89
1,287
226
813
2,365
27
762
1,237
36
694
294
1,262
315
1,083
105
773
261
11
1,883
426
178
441
1,063
339
304
28,902
GW
6
138
382
883
1,032
581
614
228
1,312
273
1,023
858
987
1,357
93
525
794
241
62
1,258
157
753
2,228
21
751
1,196
30
658
273
1,042
239
933
97
714
240
5
1,546
389
69
408
1,044
195
256
25,891
SW
5
49
72
48
239
218
37
3
22
14
33
57
98
44
149
117
68
28
27
29
69
60
137
6
11
41
6
36
21
220
76
150
8
59
21
6
337
37
109
33
19
144
48
3,011
Total Population Served by Systems
Reporting
Total
245,546
3,622,176
2,453,348
6,077,279
33,445,493
4,983,566
2,588,823
632,320
16,773,387
973,497
2,543,237
1,090,586
9,086,128
4,866,289
4,602,489
8,482,868
4,906,096
510,420
5,100,237
3,934,332
928,947
753,259
6,885,177
47,590
1,455,834
945,754
1,444,605
1,661,813
961,367
4,867,369
6,613,224
2,936,954
902,560
3,427,802
622,272
655,064
21,494,935
2,500,671
2,179,119
432,879
3,694,549
1,358,636
446,177
184,134,674
GW
13,611
774,145
910,322
2,706,688
11,991,296
519,647
261,556
350,920
14,531,382
281,475
1,434,611
834,621
2,892,050
2,546,553
375,460
1,680,486
907,989
134,500
379,121
2,684,691
284,141
360,590
1,733,551
40,561
679,354
395,955
143,223
1,398,915
271,476
949,158
638,627
572,204
163,122
801,019
263,101
144,562
5,731,435
1,667,485
28,420
181,715
2,037,305
205,538
129,229
65,031,810
SW
231,935
2,848,031
1,543,026
3,370,591
21,454,197
4,463,919
2,327,267
281,400
2,242,005
692,022
1,108,626
255,965
6,194,078
2,319,736
4,227,029
6,802,382
3,998,107
375,920
4,721,116
1,249,641
644,806
392,669
5,151,626
7,029
776,480
549,799
1,301,382
262,898
689,891
3,918,211
5,974,597
2,364,750
739,438
2,626,783
359,171
510,502
15,763,500
833,186
2,150,699
251,164
1,657,244
1,153,098
316,948
119,102,864
Percent of Systems
with At Least One Detection
Total
18.182%
1.604%
1.542%
0.322%
0.472%
1.877%
2.458%
0.433%
0.750%
0.000%
0.852%
0.219%
0.000%
0.214%
3.306%
5.140%
7.889%
0.372%
2.247%
0.311%
0.000%
0.615%
6.385%
0.000%
0.656%
0.243%
11.111%
12.248%
0.680%
0.158%
0.635%
0.000%
3.810%
0.517%
0.000%
9.091%
0.637%
3.286%
0.562%
0.680%
0.188%
2.950%
1.316%
1.754%
GW
0.000%
0.000%
1.832%
0.340%
0.484%
2.238%
2.606%
0.439%
0.762%
0.000%
0.880%
0.233%
0.000%
0.221%
1.075%
4.571%
4.534%
0.000%
1.613%
0.318%
0.000%
0.664%
6.104%
0.000%
0.533%
0.167%
13.333%
12.614%
0.366%
0.000%
0.837%
0.000%
4.124%
0.560%
0.000%
0.000%
0.259%
3.085%
1.449%
0.735%
0.192%
4.103%
1.563%
1.599%
SW
40.000%
6.122%
0.000%
0.000%
0.418%
0.917%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.698%
7.692%
47.059%
3.571%
3.704%
0.000%
0.000%
0.000%
10.949%
0.000%
9.091%
2.439%
0.000%
5.556%
4.762%
0.909%
0.000%
0.000%
0.000%
0.000%
0.000%
16.667%
2.374%
5.405%
0.000%
0.000%
0.000%
1.389%
0.000%
3.089%
Percent of Population Served
with At Least One Detection
Total
1.528%
7.237%
0.305%
0.321%
1.391%
0.273%
0.277%
0.058%
15.843%
0.000%
0.330%
0.029%
0.000%
0.339%
8.230%
6.057%
80.246%
26.830%
0.305%
0.363%
0.000%
0.065%
4.397%
0.000%
35.365%
1.454%
3.959%
50.494%
5.946%
0.095%
0.013%
0.000%
3.166%
0.134%
0.000%
27.642%
8.657%
4.239%
0.009%
1.177%
0.407%
0.678%
0.083%
6.767%
GW
0.000%
0.000%
0.821%
0.722%
1.619%
1.216%
2.745%
0.105%
18.288%
0.000%
0.586%
0.038%
0.000%
0.648%
0.506%
7.423%
11.547%
0.000%
0.034%
0.531%
0.000%
0.135%
9.181%
0.000%
0.397%
0.631%
39.936%
54.780%
0.243%
0.000%
0.137%
0.000%
17.518%
0.574%
0.000%
0.000%
0.690%
5.966%
0.658%
2.805%
0.738%
0.806%
0.286%
6.686%
SW
1.618%
9.204%
0.000%
0.000%
1.263%
0.164%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
8.916%
5.720%
95.848%
36.429%
0.327%
0.000%
0.000%
0.000%
2.787%
0.000%
65.960%
2.046%
0.000%
27.692%
8.190%
0.118%
0.000%
0.000%
0.000%
0.000%
0.000%
35.470%
11.554%
0.783%
0.000%
0.000%
0.000%
0.656%
0.000%
6.811%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A19c. Di(2-ethlyhexyl)adipate (DEHA) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 400 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 400 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.413%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.144%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.075%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.152%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.008%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 400 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1,898
0
0
0
0
0
0
0
0
0
0
0
0
21,015
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
22,913
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1,898
0
0
0
0
0
0
0
0
0
0
0
0
21,015
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
22,913
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 400 u.g/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.041%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.265%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.012%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.506%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.502%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.035%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A19d. Di(2-ethlyhexyl)adipate (DEHA) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 200 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 200 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.413%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.865%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.024%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.075%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.912%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.027%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 200 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1,898
0
0
0
0
0
0
0
0
0
0
0
0
23,055
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
24,953
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1,898
0
0
0
0
0
0
0
0
0
0
0
0
23,055
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
24,953
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 200 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.041%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.387%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.014%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.506%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.648%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.038%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A20. Di(2-ethylhexyl)phthalate (DEHP) -Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 6 ug/L
> 3 ug/L
> 6 ug/L
> 3 ug/L
> 6 ug/L
> 3 ug/L
Total # Systems
Reporting
24,677
24,677
2,990
2,990
27,667
27,667
# Systems Exceeding
Threshold of Interest
390
786
70
169
460
955
% Systems Exceeding
Threshold of Interest
1.580%
3.185%
2.341%
5.652%
1.663%
3.452%
Total Pop. Served by
Systems Reporting
62,976,862
62,976,862
116,971,710
116,971,710
179,948,572
179,948,572
Total Pop. Served by
Systems Exceeding
Threshold of Interest
2,513,952
5,407,270
8,996,752
19,734,540
11,510,704
25,141,810
% Pop. Served by
Systems Exceeding
Threshold of Interest
3.992%
8.586%
7.691%
16.871%
6.397%
13.972%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A20a. Di(2-ethylhexyl)phthalate (DEHP) -Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
50
1,225
2,242
6,772
13,156
2,651
1,323
790
2,638
1,468
1,800
2,733
3,917
2,360
2,259
3,088
2,811
456
263
4,761
304
3,047
13,796
64
4,480
4,243
30
4,437
1,569
2,800
1,102
2,095
917
2,965
959
64
10,362
7,103
494
1,313
653
1,286
120,846
GW
16
886
1,924
5,213
7,455
1,912
1,013
766
2,563
1,388
1,667
2,439
3,114
2,150
584
2,271
1,727
391
135
4,620
181
2,749
12,703
41
4,131
3,924
28
4,178
1,141
2,075
834
1,581
625
2,572
850
10
4,571
5,915
180
1,112
340
969
92,944
SW
34
339
318
1,559
5,701
739
310
24
75
80
133
294
803
210
1,675
817
1,084
65
128
141
123
298
1,093
23
349
319
2
259
428
725
268
514
292
393
109
54
5,791
1,188
314
201
313
317
27,902
Percent of Samples
with Detections
Total
0.000%
15.347%
3.390%
4.090%
0.676%
8.487%
2.948%
3.038%
4.397%
0.204%
2.444%
3.000%
0.332%
3.263%
13.015%
3.854%
63.429%
13.158%
11.787%
3.004%
0.000%
3.446%
2.276%
43.750%
2.232%
4.101%
16.667%
13.094%
2.804%
1.857%
5.172%
1.289%
5.889%
10.995%
0.104%
6.250%
0.984%
1.197%
3.644%
3.046%
9.648%
5.443%
4.910%
GW
0.000%
15.237%
3.482%
3.568%
0.604%
8.577%
3.455%
3.133%
4.331%
0.072%
2.340%
3.198%
0.417%
3.209%
13.356%
3.082%
72.032%
11.253%
13.333%
2.922%
0.000%
3.565%
2.377%
39.024%
2.348%
4.332%
17.857%
13.308%
3.067%
1.590%
5.396%
1.392%
4.640%
11.275%
0.118%
0.000%
1.072%
1.319%
8.889%
2.788%
10.294%
5.882%
4.864%
SW
0.000%
15.634%
2.830%
5.837%
0.772%
8.254%
1.290%
0.000%
6.667%
2.500%
3.759%
1.361%
0.000%
3.810%
12.896%
5.998%
49.723%
24.615%
10.156%
5.674%
0.000%
2.349%
1.098%
52.174%
0.860%
1.254%
0.000%
9.653%
2.103%
2.621%
4.478%
0.973%
8.562%
9.160%
0.000%
7.407%
0.915%
0.589%
0.637%
4.478%
8.946%
4.101%
5.061%
Minimum Detect
Concentration (u.g/L)
Total
0.06
1.34
0.5
0.14
0.21
0.4
0.5
0.14
5.2
0.6
0.12
0.9
0.57
0.1
0.3
0.1
0.06
1
0.07
0.6
0.6
0.6
2
0.06
0.36
0.05
0.31
0.62
0.2
0.08
0.42
0.11
4
0.7
2.1
0.15
0.8
0.08
0.18
0.5
0.05
GW
0.06
1.34
0.6
0.14
0.21
0.4
0.5
0.14
5.2
0.6
0.12
0.9
0.6
0.1
0.42
0.1
0.06
1
0.07
0.6
0.6
0.6
2
0.06
0.36
0.05
0.31
0.62
0.2
0.08
1
0.11
4
2.1
0.15
0.8
0.08
0.18
0.5
0.05
SW
0.06
1.5
0.5
0.22
0.28
2
0.6
6.6
0.6
0.9
0.57
0.1
0.3
0.1
0.13
1
4.2
0.76
0.8
0.6
2.2
1.2
0.07
0.71
0.64
0.63
1.3
0.42
0.64
0.7
2.1
0.9
2.3
0.6
0.18
0.6
0.06
Median Detect
Concentration (u.g/L)
Total
0.2
1.89
1
3
1.04
1
1.5
0.75
6.6
1.75
1.6
4.6
1.25
1.5
0.93
1
0.245
1.2
8.7
2.82
2.1
0.985
3.445
2.4
0.39
0.4
1.6
2.5
1.5
1.9
1.45
1.24
4
1.1
3.87
2
1.8
0.855
1.2
2.8
1.2
GW
0.18
1.88
1
3.82
1.1
1
1.5
0.75
5.2
1.8
1.58
4.6
1.29
1.6
1
0.95
0.3
1.3
8.8
2.8
2.1
0.96
3.5
2.4
0.39
0.4
1.3
2.2
1.42
1.65
1.8
1.22
4
4.19
2
1.8
0.8
1.1
2.7
1.3
SW
0.22
2.28
1
1.4
1
5.5
0.72
6.6
0.9
5.75
0.965
1.5
0.89
1
0.21
1.1
6.8
7.8
1.965
1.075
2.78
4.15
0.5
4
2.8
1.65
1.9
0.87
1.34
1.1
3.7
1.9
3
0.9
1.2
3
1.1
90th Percentile Detect
Concentration (u.g/L)
Total
2
4.5
4.2
13
2.4
7
6.4
3.4
6.6
13.9
5.3
9.2
4.53
3.5
3.8
3.8
3
2.1
21
10
5.04
2.63
9.165
8.1
1.1
5.24
5.2
10.5
4.75
5.1
4
6.86
4
4.8
11
6.6
7.3
5.35
2
9
5.8
GW
2.67
4.27
3.9
15
2.4
3
6.4
3.1
5.2
13.9
4.52
9.2
4.53
3.7
4.7
3.9
3
2.1
21
9.6
5.1
2.02
8.93
8.4
1.1
5.24
5
10.5
4.75
3.3
4.4
6.955
4
10.79
6.6
7.3
4.2
2
8
6.26
SW
0.7
9.54
4.5
9.3
2.1
11
13
6.6
18
9.8
5.6
3.5
2.8
3.4
0.35
3
49
10
3.54
2.63
9.5
4.9
2.28
46.4
11
5.4
5.2
2.9
6
4.8
11
2.7
3.7
13.1
2
10
4.4
Maximum Detect
Concentration (u.g/L)
Total
33.5
16.5
38
49
14
53
7.9
27.8
6.6
53
9.8
10
25
40
51.3
38.3
14
8
54
35
22.09
3.75
19.6
47
1.1
56.76
46.4
39
31
250
20
43
4
4.8
26
11
16
43.7
6
38
250
GW
33.5
16.5
20
49
14
53
7.9
27.8
5.2
53
8.6
10
25
40
51.3
29
12
8
54
35
22.09
3.5
19.6
47
1.1
56.76
21
39
16.6
250
20
39
4
18.3
11
16
43.7
6
38
250
SW
3
9.54
38
25
8.9
11
13
6.6
18
9.8
5.6
13
5.1
38.3
14
3
49
10
3.8
3.75
9.5
4.9
15.11
46.4
12
31
5.2
4
43
4.8
26
2.7
3.7
13.1
3.9
20
49
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A20b. Di(2-ethylhexyl)phthalate (DEHP) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
11
224
454
827
1,217
799
652
217
1,354
287
1,057
915
1,085
1,400
242
642
861
269
50
1,287
218
813
2,365
27
762
1,237
27
680
266
1,261
355
1,084
105
773
261
11
1,884
426
178
441
339
304
27,667
GW
6
164
382
782
983
581
615
214
1,331
273
1,024
857
987
1,356
93
525
793
241
23
1,258
149
753
2,228
21
751
1,196
26
646
245
1,042
278
934
97
714
240
5
1,547
389
69
408
195
256
24,677
SW
5
60
72
45
234
218
37
3
23
14
33
58
98
44
149
117
68
28
27
29
69
60
137
6
11
41
1
34
21
219
77
150
8
59
21
6
337
37
109
33
144
48
2,990
Total Population Served by Systems
Reporting
Total
245,546
3,940,846
2,453,348
5,930,120
33,392,382
4,983,566
2,589,440
619,324
16,824,422
973,497
2,543,282
1,090,891
9,086,128
4,866,255
4,602,489
8,482,938
4,906,036
510,420
5,093,160
3,934,332
920,994
753,259
6,885,177
47,590
1,455,834
945,754
818,502
1,653,619
954,770
4,834,269
6,650,006
2,937,354
902,560
3,427,802
622,272
655,064
21,497,842
2,500,671
2,179,119
432,879
1,358,636
446,177
179,948,572
GW
13,611
920,969
910,322
2,573,109
11,920,793
519,647
262,173
337,924
14,581,030
281,475
1,434,656
834,529
2,892,050
2,546,519
375,460
1,680,556
907,929
134,500
372,044
2,684,691
276,188
360,590
1,733,551
40,561
679,354
395,955
142,248
1,391,521
264,879
949,158
667,733
572,604
163,122
801,019
263,101
144,562
5,734,342
1,667,485
28,420
181,715
205,538
129,229
62,976,862
SW
231,935
3,019,877
1,543,026
3,357,011
21,471,589
4,463,919
2,327,267
281,400
2,243,392
692,022
1,108,626
256,362
6,194,078
2,319,736
4,227,029
6,802,382
3,998,107
375,920
4,721,116
1,249,641
644,806
392,669
5,151,626
7,029
776,480
549,799
676,254
262,098
689,891
3,885,111
5,982,273
2,364,750
739,438
2,626,783
359,171
510,502
15,763,500
833,186
2,150,699
251,164
1,153,098
316,948
116,971,710
Percent of Systems
with At Least One Detection
Total
0.000%
25.000%
10.573%
12.092%
4.191%
20.150%
5.368%
6.912%
4.801%
0.697%
3.311%
6.120%
1.014%
4.071%
51.240%
9.969%
88.734%
17.100%
34.000%
9.402%
0.000%
7.134%
8.710%
62.963%
7.087%
6.952%
18.519%
32.353%
9.398%
3.172%
12.394%
2.214%
18.095%
28.461%
0.383%
18.182%
4.352%
8.216%
3.933%
7.483%
14.454%
14.145%
11.197%
GW
0.000%
23.780%
11.518%
10.486%
3.154%
19.793%
5.366%
7.009%
4.583%
0.366%
3.027%
6.184%
1.114%
3.909%
44.086%
8.000%
88.146%
14.523%
30.435%
9.221%
0.000%
7.304%
8.842%
52.381%
6.791%
6.940%
19.231%
32.198%
9.388%
2.687%
13.309%
2.141%
14.433%
27.871%
0.417%
0.000%
2.780%
7.455%
7.246%
6.373%
14.359%
14.844%
10.577%
SW
0.000%
28.333%
5.556%
40.000%
8.547%
21.101%
5.405%
0.000%
17.391%
7.143%
12.121%
5.172%
0.000%
9.091%
55.705%
18.803%
95.588%
39.286%
37.037%
17.241%
0.000%
5.000%
6.569%
100.000%
27.273%
7.317%
0.000%
35.294%
9.524%
5.479%
9.091%
2.667%
62.500%
35.593%
0.000%
33.333%
11.573%
16.216%
1.835%
21.212%
14.583%
10.417%
16.321%
Percent of Population Served
with At Least One Detection
Total
0.000%
23.303%
6.518%
78.556%
16.886%
48.919%
3.370%
13.261%
19.475%
0.282%
9.649%
26.050%
0.498%
1.915%
74.807%
11.135%
98.786%
60.039%
76.463%
29.328%
0.000%
5.809%
15.336%
58.594%
11.955%
14.493%
3.075%
66.472%
9.596%
15.701%
3.583%
2.628%
42.255%
31.613%
0.032%
36.497%
28.512%
33.198%
4.403%
22.029%
17.911%
10.877%
25.227%
GW
0.000%
28.374%
13.819%
54.585%
6.138%
29.248%
3.429%
24.303%
20.263%
0.025%
5.125%
11.725%
1.565%
2.303%
29.933%
13.505%
93.833%
49.017%
30.942%
20.559%
0.000%
7.391%
25.182%
51.419%
20.646%
17.507%
17.696%
70.291%
10.123%
3.061%
19.677%
4.190%
49.531%
45.253%
0.076%
0.000%
23.761%
24.026%
7.590%
19.399%
12.385%
14.295%
19.240%
SW
0.000%
21.757%
2.211%
96.929%
22.854%
51.209%
3.363%
0.000%
14.353%
0.386%
15.504%
72.681%
0.000%
1.488%
78.792%
10.549%
99.911%
63.983%
80.050%
48.166%
0.000%
4.357%
12.023%
100.000%
4.352%
12.323%
0.000%
46.196%
9.393%
18.790%
1.786%
2.250%
40.650%
27.454%
0.000%
46.832%
30.240%
51.554%
4.361%
23.932%
18.896%
9.484%
28.450%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A20c. Di(2-ethylhexyl)phthalate (DEHP) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 6 u.g/L
Total
0
4
5
13
16
3
4
4
4
1
8
5
4
2
6
4
75
4
1
91
0
17
17
0
17
19
0
41
3
11
4
1
1
35
0
0
19
4
2
4
0
11
460
GW
0
4
3
8
9
2
2
4
3
0
7
3
4
2
3
4
57
3
1
87
0
16
17
0
16
19
0
40
2
8
3
1
1
34
0
0
8
4
2
3
0
10
390
SW
0
0
2
5
7
1
2
0
1
1
1
2
0
0
3
0
18
1
0
4
0
1
0
0
1
0
0
1
1
3
1
0
0
1
0
0
11
0
0
1
0
1
70
Percent of Systems
with At Least One Detection
> 6 ug/L
Total
0.000%
1.786%
1.101%
1.572%
1.315%
0.375%
0.613%
1.843%
0.295%
0.348%
0.757%
0.546%
0.369%
0.143%
2.479%
0.623%
8.711%
1.487%
2.000%
7.071%
0.000%
2.091%
0.719%
0.000%
2.231%
1.536%
0.000%
6.029%
1.128%
0.872%
1.127%
0.092%
0.952%
4.528%
0.000%
0.000%
1.008%
0.939%
1.124%
0.907%
0.000%
3.618%
1.663%
GW
0.000%
2.439%
0.785%
1.023%
0.916%
0.344%
0.325%
1.869%
0.225%
0.000%
0.684%
0.350%
0.405%
0.147%
3.226%
0.762%
7.188%
1.245%
4.348%
6.916%
0.000%
2.125%
0.763%
0.000%
2.130%
1.589%
0.000%
6.192%
0.816%
0.768%
1.079%
0.107%
1.031%
4.762%
0.000%
0.000%
0.517%
1.028%
2.899%
0.735%
0.000%
3.906%
1.580%
SW
0.000%
0.000%
2.778%
11.111%
2.991%
0.459%
5.405%
0.000%
4.348%
7.143%
3.030%
3.448%
0.000%
0.000%
2.013%
0.000%
26.471%
3.571%
0.000%
13.793%
0.000%
1.667%
0.000%
0.000%
9.091%
0.000%
0.000%
2.941%
4.762%
1.370%
1.299%
0.000%
0.000%
1.695%
0.000%
0.000%
3.264%
0.000%
0.000%
3.030%
0.000%
2.083%
2.341%
Population Served by Systems
with At Least One Detection
>6 u.g/L
Total
0
41,247
25,941
3,307,784
2,291,146
910
78,588
69,242
161,293
2,671
15,307
186,706
3,085
570
92,925
32,155
1,987,374
30,506
450
962,620
0
20,866
18,874
0
76,704
6,493
0
603,565
56,672
285,133
8,151
168
600
150,316
0
0
961,169
855
880
6,366
0
23,372
11,510,704
GW
0
41,247
8,152
724,702
156,205
160
324
69,242
128,294
0
15,282
680
3,085
570
4,312
32,155
37,563
543
450
452,520
0
3,871
18,874
0
76,311
6,493
0
603,513
172
9,551
4,863
168
600
83,557
0
0
20,810
855
880
476
0
7,472
2,513,952
SW
0
0
17,789
2,583,082
2,134,941
750
78,264
0
32,999
2,671
25
186,026
0
0
88,613
0
1,949,811
29,963
0
510,100
0
16,995
0
0
393
0
0
52
56,500
275,582
3,288
0
0
66,759
0
0
940,359
0
0
5,890
0
15,900
8,996,752
Percent of Population Served
with At Least One Detection
>6 u.g/L
Total
0.000%
1.047%
1.057%
55.779%
6.861%
0.018%
3.035%
11.180%
0.959%
0.274%
0.602%
17.115%
0.034%
0.012%
2.019%
0.379%
40.509%
5.977%
0.009%
24.467%
0.000%
2.770%
0.274%
0.000%
5.269%
0.687%
0.000%
36.500%
5.936%
5.898%
0.123%
0.006%
0.066%
4.385%
0.000%
0.000%
4.471%
0.034%
0.040%
1.471%
0.000%
5.238%
6.397%
GW
0.000%
4.479%
0.896%
28.164%
1.310%
0.031%
0.124%
20.490%
0.880%
0.000%
1.065%
0.081%
0.107%
0.022%
1.148%
1.913%
4.137%
0.404%
0.121%
16.856%
0.000%
1.074%
1.089%
0.000%
11.233%
1.640%
0.000%
43.371%
0.065%
1.006%
0.728%
0.029%
0.368%
10.431%
0.000%
0.000%
0.363%
0.051%
3.096%
0.262%
0.000%
5.782%
3.992%
SW
0.000%
0.000%
1.153%
76.946%
9.943%
0.017%
3.363%
0.000%
1.471%
0.386%
0.002%
72.564%
0.000%
0.000%
2.096%
0.000%
48.768%
7.971%
0.000%
40.820%
0.000%
4.328%
0.000%
0.000%
0.051%
0.000%
0.000%
0.020%
8.190%
7.093%
0.055%
0.000%
0.000%
2.541%
0.000%
0.000%
5.965%
0.000%
0.000%
2.345%
0.000%
5.017%
7.691%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A20d. Di(2-ethylhexyl)phthalate (DEHP) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 3 ug/L
Total
0
9
14
23
36
11
6
8
9
2
10
16
6
8
34
13
171
7
3
120
0
28
64
2
29
37
0
77
7
20
15
6
4
56
1
1
57
10
3
6
2
24
955
GW
0
8
12
16
20
7
4
8
8
1
9
13
6
7
10
11
136
6
1
115
0
27
61
1
28
35
0
75
6
13
13
4
3
53
1
0
30
10
2
5
1
20
786
SW
0
1
2
7
16
4
2
0
1
1
1
3
0
1
24
2
35
1
2
5
0
1
3
1
1
2
0
2
1
7
2
2
1
3
0
1
27
0
1
1
1
4
169
Percent of Systems
with At Least One Detection
> 3 ug/L
Total
0.000%
4.018%
3.084%
2.781%
2.958%
1.377%
0.920%
3.687%
0.665%
0.697%
0.946%
1.749%
0.553%
0.571%
14.050%
2.025%
19.861%
2.602%
6.000%
9.324%
0.000%
3.444%
2.706%
7.407%
3.806%
2.991%
0.000%
11.324%
2.632%
1.586%
4.225%
0.554%
3.810%
7.245%
0.383%
9.091%
3.025%
2.347%
1.685%
1.361%
0.590%
7.895%
3.452%
GW
0.000%
4.878%
3.141%
2.046%
2.035%
1.205%
0.650%
3.738%
0.601%
0.366%
0.879%
1.517%
0.608%
0.516%
10.753%
2.095%
17.150%
2.490%
4.348%
9.141%
0.000%
3.586%
2.738%
4.762%
3.728%
2.926%
0.000%
11.610%
2.449%
1.248%
4.676%
0.428%
3.093%
7.423%
0.417%
0.000%
1.939%
2.571%
2.899%
1.225%
0.513%
7.813%
3.185%
SW
0.000%
1.667%
2.778%
15.556%
6.838%
1.835%
5.405%
0.000%
4.348%
7.143%
3.030%
5.172%
0.000%
2.273%
16.107%
1.709%
51.471%
3.571%
7.407%
17.241%
0.000%
1.667%
2.190%
16.667%
9.091%
4.878%
0.000%
5.882%
4.762%
3.196%
2.597%
1.333%
12.500%
5.085%
0.000%
16.667%
8.012%
0.000%
0.917%
3.030%
0.694%
8.333%
5.652%
Population Served by Systems
with At Least One Detection
> 3 ug/L
Total
0
90,893
41,539
3,414,108
5,178,634
15,187
78,984
71,234
209,527
2,741
17,309
197,935
3,548
8,065
1,691,395
65,650
4,003,361
35,298
143,191
1,153,823
0
30,498
309,915
3,604
122,111
98,437
0
836,366
74,911
461,461
35,221
59,857
70,663
309,002
200
58,000
5,972,023
123,765
94,260
8,696
13,642
36,756
25,141,810
GW
0
69,959
23,750
806,607
599,374
4,873
720
71,234
176,528
70
17,284
11,609
3,548
2,077
11,653
58,155
188,195
5,335
450
551,923
0
13,503
182,164
196
121,718
34,187
0
763,613
18,411
25,593
11,722
7,870
2,400
151,549
200
0
1,332,646
123,765
880
2,806
381
10,322
5,407,270
SW
0
20,934
17,789
2,607,501
4,579,260
10,314
78,264
0
32,999
2,671
25
186,326
0
5,988
1,679,742
7,495
3,815,166
29,963
142,741
601,900
0
16,995
127,751
3,408
393
64,250
0
72,753
56,500
435,868
23,499
51,987
68,263
157,453
0
58,000
4,639,377
0
93,380
5,890
13,261
26,434
19,734,540
Percent of Population Served
with At Least One Detection
> 3 ug/L
Total
0.000%
2.306%
1.693%
57.572%
15.508%
0.305%
3.050%
11.502%
1.245%
0.282%
0.681%
18.144%
0.039%
0.166%
36.750%
0.774%
81.601%
6.915%
2.811%
29.327%
0.000%
4.049%
4.501%
7.573%
8.388%
10.408%
0.000%
50.578%
7.846%
9.546%
0.530%
2.038%
7.829%
9.015%
0.032%
8.854%
27.780%
4.949%
4.326%
2.009%
1.004%
8.238%
13.972%
GW
0.000%
7.596%
2.609%
31.348%
5.028%
0.938%
0.275%
21.080%
1.211%
0.025%
1.205%
1.391%
0.123%
0.082%
3.104%
3.460%
20.728%
3.967%
0.121%
20.558%
0.000%
3.745%
10.508%
0.483%
17.917%
8.634%
0.000%
54.876%
6.951%
2.696%
1.755%
1.374%
1.471%
18.920%
0.076%
0.000%
23.240%
7.422%
3.096%
1.544%
0.185%
7.987%
8.586%
SW
0.000%
0.693%
1.153%
77.673%
21.327%
0.231%
3.363%
0.000%
1.471%
0.386%
0.002%
72.681%
0.000%
0.258%
39.738%
0.110%
95.424%
7.971%
3.023%
48.166%
0.000%
4.328%
2.480%
48.485%
0.051%
11.686%
0.000%
27.758%
8.190%
11.219%
0.393%
2.198%
9.232%
5.994%
0.000%
11.361%
29.431%
0.000%
4.342%
2.345%
1.150%
8.340%
16.871%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A21. l,2-Dibromo-3-chloropropane (DBCP) -Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 0.2 ug/L
> 0.1 ug/L
> 0.2 ug/L
> 0.1 ug/L
> 0.2 ug/L
> 0.1 ug/L
Total # Systems
Reporting
34,602
34,602
3,016
3,016
37,618
37,618
# Systems Exceeding
Threshold of Interest
120
168
26
33
146
201
% Systems Exceeding
Threshold of Interest
0.347%
0.486%
0.862%
1.094%
0.388%
0.534%
Total Pop. Served by
Systems Reporting
73,552,992
73,552,992
120,196,347
120,196,347
193,749,339
193,749,339
Total Pop. Served by
Systems Exceeding
Threshold of Interest
1,032,709
1,370,317
2,118,782
5,730,210
3,151,491
7,100,527
% Pop. Served by
Systems Exceeding
Threshold of Interest
1.404%
1.863%
1.763%
4.767%
1.627%
3.665%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A21a. l,2-Dibromo-3-chloropropane (DBCP) -Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
268
634
2,532
6,206
58,699
2,559
1,486
2,309
2,394
7,886
3,057
86
1,800
3,930
2,262
1,720
2,944
2,466
2,184
5,364
8,585
7,544
1,197
12,724
70
9,185
4,043
19,688
944
2,404
551
42
2,049
2,258
3,248
1,493
55
34,144
13
4,824
435
2,867
694
1,326
231,169
GW
142
465
2,056
4,813
31,660
1,863
1,167
2,247
2,329
7,084
2,966
68
1,579
3,489
2,089
433
2,163
1,672
2,026
4,849
7,336
6,695
1,081
11,854
45
8,528
3,874
18,239
885
1,891
390
12
1,566
1,782
2,794
1,367
11
27,040
13
3,823
377
2,837
361
997
178,958
SW
126
169
476
1,393
27,039
696
319
62
65
802
91
18
221
441
173
1,287
781
794
158
515
1,249
849
116
870
25
657
169
1,449
59
513
161
30
483
476
454
126
44
7,104
0
1,001
58
30
333
329
52,211
Percent of Samples
with Detections
Total
0.000%
2.839%
0.118%
0.757%
32.846%
0.039%
0.135%
0.043%
0.794%
0.000%
5.954%
0.000%
0.000%
0.254%
0.044%
0.407%
0.102%
0.689%
0.000%
0.000%
0.000%
0.000%
0.000%
0.181%
0.000%
0.011%
0.000%
0.061%
0.212%
0.042%
1.815%
0.000%
0.098%
0.044%
2.771%
0.000%
0.000%
0.009%
7.692%
0.000%
0.000%
0.105%
1.585%
0.000%
8.544%
GW
0.000%
2.366%
0.146%
0.748%
25.158%
0.000%
0.086%
0.045%
0.816%
0.000%
6.136%
0.000%
0.000%
0.201%
0.000%
0.000%
0.046%
0.359%
0.000%
0.000%
0.000%
0.000%
0.000%
0.194%
0.000%
0.012%
0.000%
0.060%
0.226%
0.000%
2.051%
0.000%
0.128%
0.000%
2.577%
0.000%
0.000%
0.011%
7.692%
0.000%
0.000%
0.106%
2.216%
0.000%
4.675%
SW
0.000%
4.142%
0.000%
0.790%
41.847%
0.144%
0.313%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.680%
0.578%
0.544%
0.256%
1.385%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.069%
0.000%
0.195%
1.242%
0.000%
0.000%
0.210%
3.965%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.901%
0.000%
21.806%
Minimum Detect
Concentration (u.g/L)
Total
0.02
0.04
0.01
0.01
0.04
0.02
0.03
0.0014
0.02
0.02
0.02
0.01
0.02
0.009
0.01
0.02
0.06
0.003
4.9
0.02
0.09
0.4
0.02
1.6
6.6
0.01
0.0028
0.0014
GW
0.02
0.04
0.02
0.01
0.07
0.03
0.0014
0.02
0.02
0.05
0.04
0.01
0.02
0.06
0.003
0.05
0.09
0.02
1.6
6.6
0.01
0.0028
0.0014
SW
0.03
0.01
0.01
0.04
0.02
0.03
0.02
0.01
0.02
0.009
1
4.9
0.02
0.4
0.09
0.02
0.009
Median Detect
Concentration (u.g/L)
Total
0.09
0.2
0.04
0.09
0.04
0.045
0.03
0.01
0.14
0.02
0.02
0.02
0.02
0.05
0.03
0.02
0.595
0.0035
4.9
1.85
0.12
0.4
0.22
1.6
6.6
0.01
0.02
0.09
GW
0.12
0.2
0.065
0.08
0.07
0.03
0.01
0.14
0.02
0.05
0.085
0.03
0.02
0.49
0.0035
2.865
0.12
0.1
1.6
6.6
0.01
0.0114
0.08
SW
0.05
0.02
0.09
0.04
0.02
0.03
0.02
0.02
0.02
0.04
1
4.9
0.26
0.4
0.31
0.02
0.09
90th Percentile Detect
Concentration (u.g/L)
Total
0.33
0.53
0.12
0.47
0.04
0.07
0.03
0.05
0.22
0.125
0.02
0.2
0.05
0.12
0.08
0.02
1.5
0.004
4.9
4.66
0.15
0.4
0.5
1.6
6.6
0.2
0.5
0.47
GW
0.32
0.53
0.12
0.46
0.07
0.03
0.05
0.22
0.08
0.05
0.12
0.08
0.02
1.5
0.004
5.12
0.15
0.5
1.6
6.6
0.2
1.3
0.46
SW
0.35
0.06
0.48
0.04
0.02
0.17
0.02
0.2
0.02
0.12
1
4.9
0.5
0.4
0.5
0.5
0.48
Maximum Detect
Concentration (u.g/L)
Total
0.35
0.53
0.5
10.8
0.04
0.07
0.03
0.05
0.36
0.17
0.02
0.2
0.05
0.13
0.6
0.02
3.64
0.004
4.9
5.12
0.15
0.4
0.51
1.6
6.6
0.2
1.3
10.8
GW
0.33
0.53
0.25
3.3
0.07
0.03
0.05
0.36
0.08
0.05
0.12
0.6
0.02
3.64
0.004
5.12
0.15
0.5
1.6
6.6
0.2
1.3
6.6
SW
0.35
0.5
10.8
0.04
0.02
0.17
0.02
0.2
0.02
0.13
1
4.9
0.5
0.4
0.51
0.5
10.8
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A21b. l,2-Dibromo-3-chloropropane (DBCP) -Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
140
185
454
931
2,090
815
711
332
1,311
1,763
109
37
657
1,369
1,403
242
635
858
741
2,037
1,582
1,417
646
2,361
28
773
1,214
1,397
282
313
347
10
1,084
145
783
292
10
4,951
4
1,502
248
762
343
304
37,618
GW
78
138
382
883
1,796
596
673
329
1,290
1,648
97
36
630
1,265
1,359
93
524
790
688
1,977
1,552
1,340
596
2,228
22
762
1,196
1,360
267
293
265
5
934
136
723
271
5
4,609
4
1,334
223
752
197
256
34,602
SW
62
47
72
48
294
219
38
3
21
115
12
1
27
104
44
149
111
68
53
60
30
77
50
133
6
11
18
37
15
20
82
5
150
9
60
21
5
342
0
168
25
10
146
48
3,016
Total Population Served by Systems
Reporting
Total
210,315
2,887,527
2,453,348
6,054,727
34,488,472
4,992,761
2,608,625
707,346
16,789,423
7,452,538
1,300,349
187,920
926,227
9,186,672
4,866,831
4,602,489
8,407,608
4,904,050
719,849
6,884,269
4,260,523
3,004,094
693,590
6,786,602
47,665
1,462,281
614,066
7,747,090
1,419,356
968,909
1,394,537
2,712,928
2,937,104
913,884
3,445,274
655,146
595,572
25,111,902
24,010
3,371,566
353,810
2,780,940
1,370,967
446,177
193,749,339
GW
108,644
734,715
910,322
2,684,136
12,817,660
527,877
274,738
425,946
14,550,247
1,559,757
1,245,721
53,303
707,598
2,986,275
2,547,095
375,460
1,680,442
905,943
284,275
1,707,979
3,010,848
1,689,633
318,486
1,733,551
40,636
685,801
395,955
2,711,144
1,213,960
279,110
376,495
92,894
572,354
173,906
811,841
295,975
109,942
9,297,171
24,010
606,017
127,114
1,562,033
206,754
129,229
73,552,992
SW
101,671
2,152,812
1,543,026
3,370,591
21,670,812
4,464,884
2,333,887
281,400
2,239,176
5,892,781
54,628
134,617
218,629
6,200,397
2,319,736
4,227,029
6,727,166
3,998,107
435,574
5,176,290
1,249,675
1,314,461
375,104
5,053,051
7,029
776,480
218,111
5,035,946
205,396
689,799
1,018,042
2,620,034
2,364,750
739,978
2,633,433
359,171
485,630
15,814,731
0
2,765,549
226,696
1,218,907
1,164,213
316,948
120,196,347
Percent of Systems
with At Least One Detection
Total
0.000%
6.486%
0.661%
1.719%
11.196%
0.123%
0.281%
0.301%
0.992%
0.000%
4.587%
0.000%
0.000%
0.657%
0.071%
2.066%
0.315%
0.816%
0.000%
0.000%
0.000%
0.000%
0.000%
0.296%
0.000%
0.129%
0.000%
0.859%
0.355%
0.319%
2.594%
0.000%
0.092%
0.690%
3.448%
0.000%
0.000%
0.061%
25.000%
0.000%
0.000%
0.394%
2.624%
0.000%
1.029%
GW
0.000%
5.797%
0.785%
1.246%
11.303%
0.000%
0.149%
0.304%
1.008%
0.000%
5.155%
0.000%
0.000%
0.474%
0.000%
0.000%
0.191%
0.253%
0.000%
0.000%
0.000%
0.000%
0.000%
0.314%
0.000%
0.131%
0.000%
0.809%
0.375%
0.000%
2.642%
0.000%
0.107%
0.000%
3.043%
0.000%
0.000%
0.065%
25.000%
0.000%
0.000%
0.399%
4.061%
0.000%
0.922%
SW
0.000%
8.511%
0.000%
10.417%
10.544%
0.457%
2.632%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.885%
2.273%
3.356%
0.901%
7.353%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.703%
0.000%
5.000%
2.439%
0.000%
0.000%
11.111%
8.333%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.685%
0.000%
2.255%
Percent of Population Served
with At Least One Detection
Total
0.000%
7.028%
1.322%
45.524%
16.224%
0.034%
0.405%
0.031%
22.850%
0.000%
17.460%
0.000%
0.000%
1.091%
3.603%
8.536%
0.660%
71.029%
0.000%
0.000%
0.000%
0.000%
0.000%
0.353%
0.000%
0.012%
0.000%
1.349%
31.922%
0.857%
2.177%
0.000%
0.001%
7.470%
11.207%
0.000%
0.000%
0.009%
0.125%
0.000%
0.000%
0.039%
0.536%
0.000%
9.268%
GW
0.000%
9.705%
3.563%
7.946%
16.586%
0.000%
2.704%
0.052%
26.366%
0.000%
18.226%
0.000%
0.000%
1.775%
0.000%
0.000%
0.922%
2.798%
0.000%
0.000%
0.000%
0.000%
0.000%
1.384%
0.000%
0.026%
0.000%
2.175%
37.322%
0.000%
0.985%
0.000%
0.005%
0.000%
8.494%
0.000%
0.000%
0.025%
0.125%
0.000%
0.000%
0.069%
1.440%
0.000%
9.820%
SW
0.000%
6.114%
0.000%
75.449%
16.010%
0.038%
0.134%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.762%
7.559%
9.294%
0.595%
86.490%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.904%
0.000%
1.203%
2.618%
0.000%
0.000%
9.225%
12.044%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.376%
0.000%
8.929%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A21c. l,2-Dibromo-3-chloropropane (DBCP) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.2 ug/L
Total
0
6
1
2
88
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
10
0
1
7
0
0
1
21
0
0
3
1
0
0
0
2
0
146
GW
0
5
1
1
73
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
9
0
0
6
0
0
0
17
0
0
3
1
0
0
0
1
0
120
SW
0
1
0
1
15
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
1
0
0
1
4
0
0
0
0
0
0
0
1
0
26
Percent of Systems
with At Least One Detection
> 0.2 ug/L
Total
0.000%
3.243%
0.220%
0.215%
4.211%
0.000%
0.000%
0.000%
0.000%
0.000%
1.835%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.042%
0.000%
0.000%
0.000%
0.716%
0.000%
0.319%
2.017%
0.000%
0.000%
0.690%
2.682%
0.000%
0.000%
0.061%
25.000%
0.000%
0.000%
0.000%
0.583%
0.000%
0.388%
GW
0.000%
3.623%
0.262%
0.113%
4.065%
0.000%
0.000%
0.000%
0.000%
0.000%
2.062%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.045%
0.000%
0.000%
0.000%
0.662%
0.000%
0.000%
2.264%
0.000%
0.000%
0.000%
2.351%
0.000%
0.000%
0.065%
25.000%
0.000%
0.000%
0.000%
0.508%
0.000%
0.347%
SW
0.000%
2.128%
0.000%
2.083%
5.102%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.703%
0.000%
5.000%
1.220%
0.000%
0.000%
11.111%
6.667%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.685%
0.000%
0.862%
Population Served by Systems
with At Least One Detection
> 0.2 ug/L
Total
0
104,064
3,548
168,000
2,317,857
0
0
0
0
0
41,542
0
0
0
0
0
0
0
0
0
0
0
0
1,409
0
0
0
103,891
0
8,300
3,773
0
0
68,263
322,423
0
0
2,347
30
0
0
0
6,044
0
3,151,491
GW
0
53,064
3,548
28,000
793,249
0
0
0
0
0
41,542
0
0
0
0
0
0
0
0
0
0
0
0
1,409
0
0
0
58,391
0
0
3,647
0
0
0
45,812
0
0
2,347
30
0
0
0
1,670
0
1,032,709
SW
0
51,000
0
140,000
1,524,608
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
45,500
0
8,300
126
0
0
68,263
276,611
0
0
0
0
0
0
0
4,374
0
2,118,782
Percent of Population Served
with At Least One Detection
> 0.2 ug/L
Total
0.000%
3.604%
0.145%
2.775%
6.721%
0.000%
0.000%
0.000%
0.000%
0.000%
3.195%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.021%
0.000%
0.000%
0.000%
1.341%
0.000%
0.857%
0.271%
0.000%
0.000%
7.470%
9.358%
0.000%
0.000%
0.009%
0.125%
0.000%
0.000%
0.000%
0.441%
0.000%
1.627%
GW
0.000%
7.222%
0.390%
1.043%
6.189%
0.000%
0.000%
0.000%
0.000%
0.000%
3.335%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.081%
0.000%
0.000%
0.000%
2.154%
0.000%
0.000%
0.969%
0.000%
0.000%
0.000%
5.643%
0.000%
0.000%
0.025%
0.125%
0.000%
0.000%
0.000%
0.808%
0.000%
1.404%
SW
0.000%
2.369%
0.000%
4.154%
7.035%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.904%
0.000%
1.203%
0.012%
0.000%
0.000%
9.225%
10.504%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.376%
0.000%
1.763%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A21d. l,2-Dibromo-3-chloropropane (DBCP) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.1 ug/L
Total
0
8
2
5
129
0
0
0
0
0
2
0
0
1
0
1
0
3
0
0
0
0
0
1
0
0
0
11
0
1
7
0
1
1
21
0
0
3
1
0
0
1
2
0
201
GW
0
6
2
4
112
0
0
0
0
0
2
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
10
0
0
6
0
1
0
17
0
0
3
1
0
0
1
1
0
168
SW
0
2
0
1
17
0
0
0
0
0
0
0
0
1
0
1
0
2
0
0
0
0
0
0
0
0
0
1
0
1
1
0
0
1
4
0
0
0
0
0
0
0
1
0
33
Percent of Systems
with At Least One Detection
> 0.1 ug/L
Total
0.000%
4.324%
0.441%
0.537%
6.172%
0.000%
0.000%
0.000%
0.000%
0.000%
1.835%
0.000%
0.000%
0.073%
0.000%
0.413%
0.000%
0.350%
0.000%
0.000%
0.000%
0.000%
0.000%
0.042%
0.000%
0.000%
0.000%
0.787%
0.000%
0.319%
2.017%
0.000%
0.092%
0.690%
2.682%
0.000%
0.000%
0.061%
25.000%
0.000%
0.000%
0.131%
0.583%
0.000%
0.534%
GW
0.000%
4.348%
0.524%
0.453%
6.236%
0.000%
0.000%
0.000%
0.000%
0.000%
2.062%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.127%
0.000%
0.000%
0.000%
0.000%
0.000%
0.045%
0.000%
0.000%
0.000%
0.735%
0.000%
0.000%
2.264%
0.000%
0.107%
0.000%
2.351%
0.000%
0.000%
0.065%
25.000%
0.000%
0.000%
0.133%
0.508%
0.000%
0.486%
SW
0.000%
4.255%
0.000%
2.083%
5.782%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.962%
0.000%
0.671%
0.000%
2.941%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.703%
0.000%
5.000%
1.220%
0.000%
0.000%
11.111%
6.667%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.685%
0.000%
1.094%
Population Served by Systems
with At Least One Detection
> 0.1 ug/L
Total
0
143,180
31,892
168,736
2,737,737
0
0
0
0
0
41,542
0
0
1,502
0
13,807
0
3,445,000
0
0
0
0
0
1,409
0
0
0
104,311
0
8,300
3,773
0
31
68,263
322,423
0
0
2,347
30
0
0
200
6,044
0
7,100,527
GW
0
63,009
31,892
28,736
1,066,181
0
0
0
0
0
41,542
0
0
0
0
0
0
25,000
0
0
0
0
0
1,409
0
0
0
58,811
0
0
3,647
0
31
0
45,812
0
0
2,347
30
0
0
200
1,670
0
1,370,317
SW
0
80,171
0
140,000
1,671,556
0
0
0
0
0
0
0
0
1,502
0
13,807
0
3,420,000
0
0
0
0
0
0
0
0
0
45,500
0
8,300
126
0
0
68,263
276,611
0
0
0
0
0
0
0
4,374
0
5,730,210
Percent of Population Served
with At Least One Detection
> 0.1 ug/L
Total
0.000%
4.959%
1.300%
2.787%
7.938%
0.000%
0.000%
0.000%
0.000%
0.000%
3.195%
0.000%
0.000%
0.016%
0.000%
0.300%
0.000%
70.248%
0.000%
0.000%
0.000%
0.000%
0.000%
0.021%
0.000%
0.000%
0.000%
1.346%
0.000%
0.857%
0.271%
0.000%
0.001%
7.470%
9.358%
0.000%
0.000%
0.009%
0.125%
0.000%
0.000%
0.007%
0.441%
0.000%
3.665%
GW
0.000%
8.576%
3.503%
1.071%
8.318%
0.000%
0.000%
0.000%
0.000%
0.000%
3.335%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.760%
0.000%
0.000%
0.000%
0.000%
0.000%
0.081%
0.000%
0.000%
0.000%
2.169%
0.000%
0.000%
0.969%
0.000%
0.005%
0.000%
5.643%
0.000%
0.000%
0.025%
0.125%
0.000%
0.000%
0.013%
0.808%
0.000%
1.863%
SW
0.000%
3.724%
0.000%
4.154%
7.713%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.024%
0.000%
0.327%
0.000%
85.540%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.904%
0.000%
1.203%
0.012%
0.000%
0.000%
9.225%
10.504%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.376%
0.000%
4.767%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A22. 1,2-Dichlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 600 ug/L
> 300 ug/L
> 600 ug/L
> 300 ug/L
> 600 ug/L
> 300 ug/L
Total # Systems
Reporting
46,166
46,166
4,256
4,256
50,422
50,422
# Systems Exceeding
Threshold of Interest
0
0
0
0
0
0
% Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Total Pop. Served by
Systems Reporting
86,389,766
86,389,766
140,540,050
140,540,050
226,929,816
226,929,816
Total Pop. Served by
Systems Exceeding
Threshold of Interest
0
0
0
0
0
0
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A22a. 1,2-Dichlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,169
820
2,383
11,712
85,811
2,864
6,936
1,047
4,151
7,174
1,790
1,757
3,751
6,996
4,621
3,311
16,249
6,771
3,697
10,753
8,581
7,544
4,491
19,067
555
6,835
9,594
20,354
6,572
3,202
7,082
8,853
5,638
2,326
1,959
4,326
889
2,947
34,144
8,989
4,888
4,270
11,293
1,126
1,658
372,946
GW
2,037
596
1,915
9,540
45,401
2,125
6,045
1,017
4,083
6,347
1,687
1,632
3,290
6,436
4,311
1,127
12,259
5,509
3,382
9,743
7,332
6,695
3,952
17,487
418
6,257
9,112
18,568
6,096
2,575
5,424
7,691
4,202
1,684
1,591
3,789
855
1,166
27,040
7,563
4,021
3,887
11,168
438
1,155
288,648
SW
1,132
224
468
2,172
40,410
739
891
30
68
827
103
125
461
560
310
2,184
3,990
1,262
315
1,010
1,249
849
539
1,580
137
578
482
1,786
476
627
1,658
1,162
1,436
642
368
537
34
1,781
7,104
1,426
867
383
125
688
503
84,298
Percent of Samples
with Detections
Total
0.032%
0.000%
0.000%
0.026%
0.010%
0.209%
0.130%
0.000%
0.554%
0.000%
0.000%
0.000%
0.000%
0.029%
0.000%
0.453%
0.123%
0.118%
0.081%
0.186%
0.035%
0.000%
0.000%
0.115%
0.541%
0.015%
0.250%
0.206%
0.000%
0.344%
0.085%
0.000%
0.000%
0.043%
0.000%
0.023%
0.000%
0.000%
0.006%
0.000%
0.020%
0.375%
0.071%
1.155%
0.000%
0.073%
GW
0.049%
0.000%
0.000%
0.000%
0.015%
0.235%
0.149%
0.000%
0.563%
0.000%
0.000%
0.000%
0.000%
0.031%
0.000%
0.000%
0.163%
0.127%
0.089%
0.205%
0.041%
0.000%
0.000%
0.126%
0.718%
0.000%
0.198%
0.205%
0.000%
0.427%
0.074%
0.000%
0.000%
0.059%
0.000%
0.000%
0.000%
0.000%
0.007%
0.000%
0.025%
0.412%
0.072%
2.511%
0.000%
0.081%
SW
0.000%
0.000%
0.000%
0.138%
0.005%
0.135%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.687%
0.000%
0.079%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.173%
1.245%
0.224%
0.000%
0.000%
0.121%
0.000%
0.000%
0.000%
0.000%
0.186%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.291%
0.000%
0.045%
Minimum Detect
Concentration (u.g/L)
Total
0.5
0.5
0.03
0.04
0.6
0.07
0.68
0.004
0.4
0.1
0.5
0.5
0.2
0.5
0.6
1
0.5
0.09
1.43
0.5
1.1
0.1
0.5
0.7
1
0.01
0.21
0.004
GW
0.5
0.6
0.04
0.6
0.07
0.68
0.4
0.4
0.5
0.5
0.2
0.5
0.6
0.5
0.09
1.43
0.5
1.1
0.5
0.7
1
0.01
0.21
0.01
SW
0.5
0.03
0.05
0.004
0.1
1
0.5
0.2
0.5
0.1
0.5
0.004
Median Detect
Concentration (u.g/L)
Total
0.5
0.5
0.8
0.045
1.5
0.5
0.94
0.5
0.76
1.15
0.5
0.8
0.3
0.8
1.02
1
1.05
1.1
2.99
0.5
1.1
0.1
0.9
0.7
2
0.44
0.5
0.8
GW
0.5
0.8
0.04
1.5
0.5
0.94
0.76
1.2
0.5
0.8
0.3
0.8
1.02
1.1
1.325
2.99
0.5
1.1
0.9
0.7
2
0.44
0.5
0.9
SW
0.5
3.015
0.05
0.5
0.1
1
0.6
0.3
0.5
0.1
0.5
0.5
90th Percentile Detect
Concentration (u.g/L)
Total
0.5
0.5
6
0.06
6.9
2
1.2
1.2
35
16
1.9
0.9
0.7
1.7
6.94
1
1.4
4.42
7.93
0.7
1.1
0.1
1.3
0.7
2.6
90
0.5
2.74
GW
0.5
1.1
0.06
6.9
2
1.2
35
16
1.9
0.9
0.7
1.7
6.94
1.4
4.69
7.93
0.7
1.1
1.3
0.7
2.6
90
0.5
3
SW
0.5
6
0.05
1.2
0.1
1
2.1
0.4
0.5
0.1
0.5
1.3
Maximum Detect
Concentration (u.g/L)
Total
0.5
0.5
6
0.06
6.9
2.4
1.2
1.4
45
16
1.9
1
0.7
4.9
6.94
1
2.1
9.04
110
0.7
1.1
0.1
1.3
0.7
3
90
0.5
110
GW
0.5
1.1
0.06
6.9
2.4
1.2
45
16
1.9
1
0.7
4.9
6.94
1.4
9.04
110
0.7
1.1
1.3
0.7
3
90
0.5
110
SW
0.5
6
0.05
1.4
0.1
1
2.1
0.4
0.5
0.1
0.5
6
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A22b. 1,2-Dichlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
263
454
1,059
3,650
826
1,207
318
1,510
1,822
106
1,056
935
1,429
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
209
771
1,258
1,398
727
338
1,520
1,944
730
1,097
145
817
245
351
4,951
500
1,590
603
1,784
402
304
50,422
GW
474
202
382
1,011
3,133
605
1,168
315
1,484
1,706
94
1,023
878
1,325
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
182
760
1,217
1,361
688
317
1,284
1,819
518
945
136
755
233
162
4,609
454
1,420
560
1,764
242
256
46,166
SW
146
61
72
48
517
221
39
3
26
116
12
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
170
43
20
160
48
4,256
Total Population Served by Systems
Reporting
Total
606,193
4,218,278
2,453,348
6,166,873
35,827,368
4,997,841
2,723,376
698,987
17,495,564
7,485,298
1,293,745
2,543,141
1,093,666
9,217,431
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,332
1,462,181
948,788
7,748,495
1,698,980
973,592
4,893,045
10,227,597
3,123,687
2,940,119
913,884
3,356,049
266,416
5,685,258
25,111,902
2,553,197
5,269,962
491,035
4,039,526
1,415,371
446,177
226,929,816
GW
232,590
1,123,190
910,322
2,796,282
13,514,907
530,207
389,454
417,587
15,249,522
1,592,517
1,239,117
1,434,515
837,604
3,017,034
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,107
685,701
398,989
2,712,549
1,432,432
283,701
1,042,443
3,132,660
664,833
574,689
173,906
732,097
194,218
1,462,502
9,297,171
1,698,877
628,527
227,067
2,347,782
237,021
129,229
86,389,766
SW
373,603
3,095,088
1,543,026
3,370,591
22,312,461
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,641,435
263,968
1,691,744
1,178,350
316,948
140,540,050
Percent of Systems
with At Least One Detection
Total
0.161%
0.000%
0.000%
0.094%
0.164%
0.605%
0.249%
0.000%
0.331%
0.000%
0.000%
0.000%
0.000%
0.140%
0.000%
4.149%
0.557%
0.474%
0.370%
0.034%
0.190%
0.000%
0.000%
0.465%
0.957%
0.130%
0.397%
1.001%
0.000%
0.592%
0.395%
0.000%
0.000%
0.091%
0.000%
0.122%
0.000%
0.000%
0.040%
0.000%
0.063%
0.332%
0.336%
3.234%
0.000%
0.230%
GW
0.211%
0.000%
0.000%
0.000%
0.128%
0.661%
0.257%
0.000%
0.337%
0.000%
0.000%
0.000%
0.000%
0.151%
0.000%
0.000%
0.667%
0.406%
0.396%
0.034%
0.193%
0.000%
0.000%
0.494%
1.099%
0.000%
0.329%
0.955%
0.000%
0.631%
0.312%
0.000%
0.000%
0.106%
0.000%
0.000%
0.000%
0.000%
0.043%
0.000%
0.070%
0.357%
0.340%
4.545%
0.000%
0.201%
SW
0.000%
0.000%
0.000%
2.083%
0.387%
0.452%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.711%
0.000%
1.471%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
9.091%
2.439%
2.703%
0.000%
0.000%
0.847%
0.000%
0.000%
0.000%
0.000%
1.613%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.250%
0.000%
0.540%
Percent of Population Served
with At Least One Detection
Total
0.825%
0.000%
0.000%
4.865%
0.901%
0.016%
0.065%
0.000%
1.033%
0.000%
0.000%
0.000%
0.000%
0.012%
0.000%
10.100%
0.101%
34.044%
0.043%
0.004%
0.075%
0.000%
0.000%
0.029%
0.341%
35.027%
3.786%
1.420%
0.000%
0.209%
0.082%
0.000%
0.000%
0.020%
0.000%
0.479%
0.000%
0.000%
0.039%
0.000%
0.002%
0.044%
0.285%
2.060%
0.000%
1.646%
GW
2.150%
0.000%
0.000%
0.000%
0.897%
0.112%
0.454%
0.000%
1.185%
0.000%
0.000%
0.000%
0.000%
0.036%
0.000%
0.000%
0.494%
0.014%
0.106%
0.014%
0.106%
0.000%
0.000%
0.117%
0.745%
0.000%
0.480%
3.935%
0.000%
0.717%
0.355%
0.000%
0.000%
0.104%
0.000%
0.000%
0.000%
0.000%
0.106%
0.000%
0.019%
0.095%
0.491%
0.979%
0.000%
0.539%
SW
0.000%
0.000%
0.000%
8.901%
0.903%
0.005%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
10.996%
0.000%
42.770%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
65.960%
6.184%
0.066%
0.000%
0.000%
0.008%
0.000%
0.000%
0.000%
0.000%
0.612%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.277%
0.000%
2.326%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A22c. 1,2-Dichlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 600 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 600 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 600 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 600 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A22d. 1,2-Dichlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 300 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 300 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 300 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 300 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A23. 1,4-Dichlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 75 ug/L
> 37.5 ug/L
> 75 ug/L
> 37.5 ug/L
> 75 ug/L
> 37.5 ug/L
Total # Systems
Reporting
45,785
45,785
4,184
4,184
49,969
49,969
# Systems Exceeding
Threshold of Interest
3
6
0
0
3
6
% Systems Exceeding
Threshold of Interest
0.007%
0.013%
0.000%
0.000%
0.006%
0.012%
Total Pop. Served by
Systems Reporting
85,479,601
85,479,601
138,997,024
138,997,024
224,476,625
224,476,625
Total Pop. Served by
Systems Exceeding
Threshold of Interest
99,019
103,510
0
0
99,019
103,510
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.116%
0.121%
0.000%
0.000%
0.044%
0.046%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A23a. 1,4-Dichlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,184
822
11,687
85,845
2,867
6,936
1,050
4,156
7,174
1,790
1,803
3,750
7,002
4,624
3,314
16,249
6,771
3,697
10,753
8,597
7,544
4,491
19,068
551
6,835
9,600
20,349
6,578
3,204
7,083
8,848
5,638
2,324
1,959
4,330
889
2,951
34,146
8,993
4,883
4,270
11,295
1,140
1,658
370,698
GW
2,046
597
9,520
45,431
2,124
6,045
1,020
4,089
6,347
1,687
1,665
3,289
6,442
4,314
1,128
12,259
5,509
3,382
9,743
7,339
6,695
3,952
17,488
416
6,257
9,122
18,563
6,102
2,575
5,425
7,686
4,202
1,682
1,591
3,793
855
1,165
27,040
7,562
4,015
3,886
11,170
448
1,155
286,821
SW
1,138
225
2,167
40,414
743
891
30
67
827
103
138
461
560
310
2,186
3,990
1,262
315
1,010
1,258
849
539
1,580
135
578
478
1,786
476
629
1,658
1,162
1,436
642
368
537
34
1,786
7,106
1,431
868
384
125
692
503
83,877
Percent of Samples
with Detections
Total
0.345%
0.365%
0.034%
0.047%
0.837%
0.663%
0.667%
0.577%
0.251%
0.000%
1.664%
0.053%
0.314%
1.125%
0.634%
0.215%
0.753%
0.270%
0.549%
0.826%
0.278%
0.022%
0.210%
1.089%
0.132%
0.469%
0.580%
0.106%
0.343%
0.212%
1.288%
0.603%
0.000%
0.051%
0.069%
0.000%
0.441%
0.343%
0.111%
0.369%
0.562%
1.965%
1.404%
0.121%
0.371%
GW
0.293%
0.335%
0.011%
0.059%
0.612%
0.761%
0.686%
0.587%
0.252%
0.000%
1.261%
0.061%
0.264%
1.205%
0.266%
0.237%
0.908%
0.266%
0.585%
0.627%
0.239%
0.025%
0.223%
0.000%
0.128%
0.493%
0.620%
0.115%
0.427%
0.240%
1.483%
0.714%
0.000%
0.063%
0.000%
0.000%
0.000%
0.318%
0.132%
0.399%
0.618%
1.952%
2.902%
0.000%
0.417%
SW
0.439%
0.444%
0.138%
0.032%
1.480%
0.000%
0.000%
0.000%
0.242%
0.000%
6.522%
0.000%
0.893%
0.000%
0.823%
0.150%
0.079%
0.317%
0.198%
1.987%
0.589%
0.000%
0.063%
4.444%
0.173%
0.000%
0.168%
0.000%
0.000%
0.121%
0.000%
0.279%
0.000%
0.000%
0.559%
0.000%
0.728%
0.436%
0.000%
0.230%
0.000%
3.200%
0.434%
0.398%
0.217%
Minimum Detect
Concentration (u.g/L)
Total
0.31
0.8
0.5
0.01
0.04
0.6
0.56
0.0052
0.54
0.2
0.1
0.21
0.5
0.002
0.3
0.2
0.42
0.4
0.2
0.5
0.58
0.5
0.74
0.5
0.52
0.07
0.3
0.1
0.5
0.5
0.4
1.7
0.3
0.52
0.5
0.1
0.6
0.6
0.02
0.27
0.7
0.002
GW
0.32
0.8
0.9
0.51
0.04
0.6
0.56
0.0052
0.54
0.2
0.1
0.21
0.5
0.5
0.3
0.2
0.42
0.4
0.2
0.5
0.58
0.5
0.5
0.52
0.07
0.3
0.1
0.5
0.5
0.5
1.7
0.5
0.1
0.6
0.6
0.02
0.27
0.0052
SW
0.31
1.5
0.5
0.01
0.05
0.83
0.5
0.59
0.002
0.4
0.2
1.7
0.5
0.2
0.5
0.6
0.74
1.1
0.1
0.5
0.4
0.3
0.52
0.5
0.6
0.1
0.5
0.7
0.002
Median Detect
Concentration (u.g/L)
Total
0.6
1.23
0.5
0.89
0.06
0.955
0.85
1.295
1.55
0.7
0.4
0.9
1
0.5
1.1
0.9
0.65
0.6
0.4
1.1
0.58
0.9
1.11
0.66
1.1
0.515
1
1.07
1.2
1.1
1.2
1.7
0.59
0.71
0.8
0.4
0.75
1.5
0.42
0.5
0.75
0.8
GW
2.08
1.015
0.9
1
0.05
0.955
0.85
1.295
1.55
0.7
0.4
0.9
1
0.5
1.3
0.95
0.6
0.7
0.4
1.25
0.58
0.9
0.625
1.1
0.52
1
1.07
1.5
1.1
1.22
1.7
0.9
0.4
0.8
1.5
0.43
0.5
0.8
SW
0.6
1.5
0.5
0.53
0.74
1.315
0.7
0.9
0.5
0.495
0.2
1.7
0.55
0.4
0.7
0.6
1.11
1.1
0.1
0.5
0.95
0.59
0.71
0.7
0.65
0.15
0.5
0.75
0.6
90th Percentile Detect
Concentration (u.g/L)
Total
4.3
1.5
0.9
3.6
1.5
1.7
4.11
5.3
4.3
1.4
0.7
1.45
2.4
1
8.9
3.8
2.15
1.8
1.5
3
0.58
1.75
1.86
4.6
2.7
1.92
1.4
1.52
2.1
4.18
4.3
1.7
0.97
1.1
1.6
4.7
1.7
2
2.5
1.21
0.8
2.4
GW
5
1.23
0.9
10
0.07
1.7
4.11
5.3
4.3
1.4
0.7
1.7
2.4
0.7
9
4.3
2.6
1.8
1.9
3.5
0.58
1.9
4.6
2.7
1.92
1.4
1.52
2.1
4.18
5.15
1.7
1.5
4.7
1.7
2
2.5
1.21
2.5
SW
1.5
1.5
0.5
1.4
11.8
1.8
1.3
1.11
1.2
1.4
0.2
1.7
0.6
0.8
2.3
0.6
1.86
1.1
1
0.5
1.4
0.97
1.1
1.6
0.7
0.24
0.8
0.8
1.4
Maximum Detect
Concentration (u.g/L)
Total
5
1.5
0.9
91
13.6
700
4.11
41
4.5
5.1
0.7
7
7.9
6
50
8.4
2.6
9.3
4.2
47.8
0.58
91.5
1.86
4.6
5
25.21
1.4
1.7
3.4
14.2
16.3
1.7
0.97
2
3.5
4.7
2.7
2.3
16
1.21
0.8
700
GW
5
1.23
0.9
91
0.3
700
4.11
41
4.5
5.1
0.7
7
7.9
0.7
50
8.4
2.6
9.3
4.2
47.8
0.58
91.5
4.6
5
25.21
1.4
1.7
3.4
14.2
16.3
1.7
3.5
4.7
2.7
2.3
16
1.21
700
SW
1.5
1.5
0.5
2.2
13.6
1.8
1.3
1.11
6
1.4
0.2
1.7
0.6
2.5
2.3
0.6
1.86
1.1
1
0.5
1.4
0.97
2
2.1
0.7
0.24
0.8
0.8
13.6
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A23b. 1,4-Dichlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
263
1,059
3,651
826
1,207
319
1,510
1,822
106
1,056
935
1,429
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
209
771
1,258
1,398
727
338
1,520
1,944
730
1,097
145
818
245
351
4,951
500
1,587
603
1,784
403
304
49,969
GW
474
202
1,011
3,134
605
1,168
316
1,484
1,706
94
1,023
878
1,325
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
182
760
1,217
1,361
688
317
1,284
1,819
518
945
136
756
233
162
4,609
454
1,417
560
1,764
243
256
45,785
SW
146
61
48
517
221
39
3
26
116
12
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
170
43
20
160
48
4,184
Total Population Served by Systems
Reporting
Total
606,193
4,218,278
6,166,873
35,827,608
4,997,841
2,723,376
699,187
17,495,564
7,485,298
1,293,745
2,543,141
1,093,666
9,217,431
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,332
1,462,181
948,788
7,748,495
1,698,980
973,592
4,893,045
10,227,597
3,123,687
2,940,119
913,884
3,356,179
266,416
5,685,258
25,111,902
2,553,197
5,268,900
491,035
4,039,526
1,416,020
446,177
224,476,625
GW
232,590
1,123,190
2,796,282
13,515,147
530,207
389,454
417,787
15,249,522
1,592,517
1,239,117
1,434,515
837,604
3,017,034
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,107
685,701
398,989
2,712,549
1,432,432
283,701
1,042,443
3,132,660
664,833
574,689
173,906
732,227
194,218
1,462,502
9,297,171
1,698,877
627,465
227,067
2,347,782
237,670
129,229
85,479,601
SW
373,603
3,095,088
3,370,591
22,312,461
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,641,435
263,968
1,691,744
1,178,350
316,948
138,997,024
Percent of Systems
with At Least One Detection
Total
1.290%
1.141%
0.189%
0.685%
1.695%
1.326%
1.881%
1.325%
0.329%
0.000%
1.610%
0.214%
0.910%
1.832%
5.809%
2.507%
2.467%
0.988%
0.841%
2.528%
1.059%
0.118%
1.352%
0.478%
0.908%
1.431%
3.720%
0.963%
1.479%
0.724%
2.675%
1.918%
0.000%
0.690%
0.244%
0.000%
1.709%
1.737%
0.600%
0.630%
1.161%
6.278%
3.722%
0.329%
1.497%
GW
0.844%
0.990%
0.099%
0.670%
1.653%
1.370%
1.899%
1.348%
0.293%
0.000%
1.271%
0.228%
0.906%
1.888%
3.261%
2.500%
2.535%
0.925%
0.790%
2.062%
0.896%
0.127%
1.391%
0.000%
0.789%
1.479%
3.674%
1.017%
1.577%
0.701%
2.859%
2.317%
0.000%
0.735%
0.000%
0.000%
0.000%
1.410%
0.661%
0.565%
1.250%
6.179%
4.938%
0.000%
1.424%
SW
2.740%
1.639%
2.083%
0.774%
1.810%
0.000%
0.000%
0.000%
0.862%
0.000%
12.121%
0.000%
0.962%
0.000%
7.383%
2.542%
1.471%
1.887%
3.279%
26.667%
3.896%
0.000%
0.719%
3.704%
9.091%
0.000%
5.405%
0.000%
0.000%
0.847%
0.000%
0.943%
0.000%
0.000%
3.226%
0.000%
3.175%
6.140%
0.000%
1.176%
0.000%
15.000%
1.875%
2.083%
2.294%
Percent of Population Served
with At Least One Detection
Total
1.462%
0.550%
4.866%
2.536%
0.080%
0.047%
0.210%
0.831%
0.078%
0.000%
6.196%
0.034%
2.508%
3.692%
10.078%
1.185%
34.301%
1.026%
1.501%
7.596%
1.957%
0.012%
0.734%
0.676%
35.082%
0.313%
2.737%
0.207%
0.164%
0.107%
0.199%
2.165%
0.000%
0.022%
11.987%
0.000%
2.033%
3.204%
0.029%
0.421%
0.116%
10.150%
5.102%
0.013%
3.325%
GW
2.259%
0.164%
0.004%
3.853%
0.488%
0.330%
0.352%
0.954%
0.115%
0.000%
0.989%
0.045%
4.381%
7.023%
0.571%
2.923%
1.275%
0.478%
1.146%
5.521%
0.445%
0.026%
1.932%
0.000%
0.116%
0.744%
6.111%
0.245%
0.564%
0.471%
0.651%
2.015%
0.000%
0.115%
0.000%
0.000%
0.000%
1.366%
0.044%
0.477%
0.252%
16.047%
0.944%
0.000%
2.374%
SW
0.965%
0.690%
8.901%
1.739%
0.032%
0.000%
0.000%
0.000%
0.068%
0.000%
12.934%
0.000%
1.597%
0.000%
10.922%
0.738%
42.770%
1.395%
1.636%
12.597%
3.901%
0.000%
0.339%
1.245%
65.960%
0.000%
0.919%
0.000%
0.000%
0.008%
0.000%
2.205%
0.000%
0.000%
15.332%
0.000%
2.737%
4.284%
0.000%
0.413%
0.000%
1.966%
5.940%
0.019%
3.910%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A23c. 1,4-Dichlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 75 ug/L
Total
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3
GW
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 75 ug/L
Total
0.000%
0.000%
0.000%
0.027%
0.000%
0.083%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.042%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.006%
GW
0.000%
0.000%
0.000%
0.032%
0.000%
0.086%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.045%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 75 ug/L
Total
0
0
0
98,730
0
60
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
229
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
99,019
GW
0
0
0
98,730
0
60
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
229
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
99,019
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 75 ug/L
Total
0.000%
0.000%
0.000%
0.276%
0.000%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.044%
GW
0.000%
0.000%
0.000%
0.731%
0.000%
0.015%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.013%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.116%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A23d. 1,4-Dichlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 37.5 ug/L
Total
0
0
0
1
0
1
0
1
0
0
0
0
0
0
0
1
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6
GW
0
0
0
1
0
1
0
1
0
0
0
0
0
0
0
1
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 37.5 ug/L
Total
0.000%
0.000%
0.000%
0.027%
0.000%
0.083%
0.000%
0.066%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.139%
0.000%
0.000%
0.000%
0.000%
0.071%
0.000%
0.042%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.012%
GW
0.000%
0.000%
0.000%
0.032%
0.000%
0.086%
0.000%
0.067%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.167%
0.000%
0.000%
0.000%
0.000%
0.075%
0.000%
0.045%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.013%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 37.5 ug/L
Total
0
0
0
98,730
0
60
0
26
0
0
0
0
0
0
0
65
0
0
0
0
4,400
0
229
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
103,510
GW
0
0
0
98,730
0
60
0
26
0
0
0
0
0
0
0
65
0
0
0
0
4,400
0
229
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
103,510
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 37.5 ug/L
Total
0.000%
0.000%
0.000%
0.276%
0.000%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.146%
0.000%
0.003%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.046%
GW
0.000%
0.000%
0.000%
0.731%
0.000%
0.015%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
0.000%
0.000%
0.000%
0.000%
0.260%
0.000%
0.013%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.121%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A24. 1,2-Dichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
> 5 ug/L
> 2.5 ug/L
> 1 ug/L
> 0.5 ug/L
Total # Systems
Reporting
46,185
46,185
46,185
46,185
4,257
4,257
4,257
4,257
50,442
50,442
50,442
50,442
# Systems Exceeding
Threshold of Interest
33
58
139
214
3
8
25
41
36
66
164
255
% Systems Exceeding
Threshold of Interest
0.071%
0.126%
0.301%
0.463%
0.070%
0.188%
0.587%
0.963%
0.071%
0.131%
0.325%
0.506%
Total Pop. Served by
Systems Reporting
86,392,793
86,392,793
86,392,793
86,392,793
140,541,198
140,541,198
140,541,198
140,541,198
226,933,991
226,933,991
226,933,991
226,933,991
Total Pop. Served by
Systems Exceeding
Threshold of Interest
247,240
337,994
858,498
1,399,602
190,972
4,412,609
5,428,439
7,551,832
438,212
4,750,603
6,286,937
8,951,434
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.286%
0.391%
0.994%
1.620%
0.136%
3.140%
3.863%
5.373%
0.193%
2.093%
2.770%
3.945%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A24a. 1,2-Dichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,110
827
2,394
11,693
88,321
2,878
6,938
1,069
4,147
7,176
1,791
1,823
3,765
6,998
4,623
3,317
16,249
6,773
3,697
10,753
8,584
7,544
4,491
19,067
552
6,844
9,583
20,359
6,577
3,210
7,081
8,848
5,636
2,324
1,959
4,340
889
2,945
34,145
8,994
4,931
4,351
11,291
1,140
1,609
375,636
GW
1,973
603
1,926
9,525
46,908
2,139
6,047
1,039
4,079
6,349
1,688
1,698
3,304
6,438
4,313
1,131
12,259
5,511
3,382
9,743
7,335
6,695
3,952
17,487
417
6,265
9,105
18,571
6,102
2,579
5,412
7,686
4,201
1,682
1,591
3,801
855
1,165
27,041
7,563
4,058
3,957
11,166
444
1,123
290,308
SW
1,137
224
468
2,168
41,413
739
891
30
68
827
103
125
461
560
310
2,186
3,990
1,262
315
1,010
1,249
849
539
1,580
135
579
478
1,788
475
631
1,669
1,162
1,435
642
368
539
34
1,780
7,104
1,431
873
394
125
696
486
85,328
Percent of Samples
with Detections
Total
0.450%
1.088%
0.376%
0.111%
1.127%
0.243%
0.115%
0.374%
0.482%
0.543%
0.000%
0.549%
0.027%
0.029%
0.043%
0.422%
0.172%
0.340%
0.189%
0.400%
1.153%
0.106%
0.089%
0.393%
0.000%
0.921%
0.230%
0.894%
0.091%
0.031%
0.254%
0.068%
2.129%
0.000%
0.000%
0.323%
0.112%
0.136%
0.152%
0.000%
0.507%
0.161%
1.081%
1.228%
0.000%
0.557%
GW
0.456%
1.493%
0.467%
0.105%
1.190%
0.327%
0.116%
0.289%
0.490%
0.378%
0.000%
0.589%
0.030%
0.031%
0.023%
0.088%
0.082%
0.327%
0.207%
0.441%
1.350%
0.119%
0.101%
0.423%
0.000%
0.990%
0.242%
0.781%
0.082%
0.039%
0.296%
0.052%
2.833%
0.000%
0.000%
0.263%
0.117%
0.258%
0.148%
0.000%
0.616%
0.177%
1.093%
2.477%
0.000%
0.526%
SW
0.440%
0.000%
0.000%
0.138%
1.055%
0.000%
0.112%
3.333%
0.000%
1.814%
0.000%
0.000%
0.000%
0.000%
0.323%
0.595%
0.451%
0.396%
0.000%
0.000%
0.000%
0.000%
0.000%
0.063%
0.000%
0.173%
0.000%
2.069%
0.211%
0.000%
0.120%
0.172%
0.070%
0.000%
0.000%
0.742%
0.000%
0.056%
0.169%
0.000%
0.000%
0.000%
0.000%
0.431%
0.000%
0.661%
Minimum Detect
Concentration (u.g/L)
Total
0.21
0.5
0.1
0.5
0.13
0.5
0.6
0.63
0.07
0.5
0.1
0.6
0.8
0.8
0.005
0.41
0.1
0.5
0.5
0.2
0.5
0.69
0.5
0.11
0.6
0.08
0.1
0.81
0.5
0.5
0.3
0.58
1.3
0.52
0.5
0.5
0.5
0.01
0.11
0.005
GW
0.21
0.5
0.1
0.59
0.13
0.5
0.6
0.63
0.07
0.5
0.1
0.6
0.8
1.6
0.1
0.5
0.6
0.5
0.5
0.2
0.5
0.69
0.5
0.11
0.6
0.08
0.1
0.81
0.5
0.5
0.3
0.58
1.3
0.52
0.5
0.5
0.5
0.01
0.11
0.01
SW
0.5
0.5
0.5
1.2
5.19
1.1
0.8
0.005
0.41
0.1
0.82
0.25
0.2
0.8
0.5
1.1
0.7
0.58
0.55
0.5
0.5
0.005
Median Detect
Concentration (u.g/L)
Total
0.675
1.1
0.29
0.7
1.2
3.6
1.05
0.745
0.13
1.5
0.8
0.6
0.8
1.2
0.195
1.15
1.5
1.1
1
0.7
0.85
0.905
1.42
0.6
0.945
0.56
0.645
0.81
0.66
1
0.9
1.69
1.3
0.585
1.05
0.8
0.6
0.285
0.5
0.9
GW
0.76
1.1
0.29
0.9
1.9
3.6
0.9
0.69
0.13
0.745
0.8
0.6
0.8
1.6
0.1
1
2.6
1.1
1
0.7
0.85
0.905
1.56
0.645
0.945
0.5
0.55
0.81
0.7
0.76
0.9
1.83
1.3
0.62
1.3
0.8
0.6
0.285
0.5
1
SW
0.59
0.5
0.75
1.2
5.19
2.2
0.8
0.2
1.15
1
0.82
0.25
0.6
0.8
0.5
2.275
0.7
1.125
0.55
0.85
0.5
0.745
90th Percentile Detect
Concentration (u.g/L)
Total
1.2
2.07
5.58
1.5
3.1
26
15
5.19
0.3
2.5
1.95
0.6
0.8
1.6
0.5
3.4
54.5
7.3
8.9
4.1
1.8
4.3
5.3
2.36
14
1.4
0.99
0.81
11.7
3.45
2.75
2.22
1.3
0.75
4.1
1.4
1.6
0.76
0.5
3.1
GW
1.3
2.07
5.58
1.6
3.7
26
15
0.8
0.3
2.1
1.95
0.6
0.8
1.6
0.1
2.05
65.3
7.3
8.9
4.1
1.8
4.3
5.3
2.36
14
1.51
0.99
0.81
11.7
2.6
2.8
2.285
1.3
0.75
6.65
1.4
1.6
0.76
0.5
3.6
SW
1.08
0.5
1.8
1.2
5.19
2.6
0.8
0.5
4
1.2
0.82
0.25
1.2
0.8
0.5
3.45
0.7
1.69
0.55
1
1
2
Maximum Detect
Concentration (u.g/L)
Total
1.3
2.07
5.58
1.7
33
26
15
5.19
4.18
2.7
2.2
0.6
0.8
1.6
1
47
135.8
7.3
13.3
11
1.8
4.3
9.7
14
62.74
10
0.99
0.81
46
3.45
5
2.35
1.3
0.75
8.3
6.4
1.6
15
1
135.8
GW
1.3
2.07
5.58
1.7
11
26
15
0.8
4.18
2.6
2.2
0.6
0.8
1.6
0.1
2.1
135.8
7.3
13.3
11
1.8
4.3
9.7
14
62.74
10
0.99
0.81
46
2.6
5
2.35
1.3
0.75
8.3
6.4
1.6
15
0.5
135.8
SW
1.08
0.5
33
1.2
5.19
2.7
0.8
1
47
1.2
0.82
0.25
1.8
0.8
0.5
3.45
0.7
1.69
0.55
1.1
1
47
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A24b. 1,2-Dichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
263
454
1,058
3,653
826
1,207
318
1,509
1,822
106
1,056
935
1,429
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
210
771
1,258
1,398
727
338
1,525
1,944
730
1,097
145
819
245
351
4,951
500
1,600
603
1,784
403
304
50,442
GW
474
202
382
1,010
3,136
605
1,168
315
1,483
1,706
94
1,023
878
1,325
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
183
760
1,217
1,361
688
317
1,289
1,819
518
945
136
757
233
162
4,609
454
1,429
560
1,764
243
256
46,185
SW
146
61
72
48
517
221
39
3
26
116
12
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
171
43
20
160
48
4,257
Total Population Served by Systems
Reporting
Total
606,193
4,218,278
2,453,348
6,162,837
35,828,228
4,997,841
2,723,376
698,987
17,495,514
7,485,298
1,293,745
2,543,141
1,093,666
9,217,431
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,748,495
1,698,980
973,592
4,895,654
10,227,597
3,123,687
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,273,258
491,035
4,039,526
1,416,020
446,177
226,933,991
GW
232,590
1,123,190
910,322
2,792,246
13,515,767
530,207
389,454
417,587
15,249,472
1,592,517
1,239,117
1,434,515
837,604
3,017,034
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,712,549
1,432,432
283,701
1,045,052
3,132,660
664,833
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
630,675
227,067
2,347,782
237,670
129,229
86,392,793
SW
373,603
3,095,088
1,543,026
3,370,591
22,312,461
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,642,583
263,968
1,691,744
1,178,350
316,948
140,541,198
Percent of Systems
with At Least One Detection
Total
1.290%
2.281%
0.881%
0.473%
0.876%
0.121%
0.497%
1.258%
0.530%
0.329%
0.000%
0.568%
0.107%
0.070%
0.136%
3.320%
2.089%
1.233%
0.494%
0.202%
1.011%
0.212%
0.354%
0.972%
0.000%
3.502%
0.715%
3.004%
0.550%
0.296%
0.656%
0.309%
2.877%
0.000%
0.000%
0.488%
0.408%
0.570%
0.222%
0.000%
0.563%
0.829%
1.626%
3.474%
0.000%
0.745%
GW
0.844%
2.970%
1.047%
0.396%
0.638%
0.165%
0.428%
0.952%
0.539%
0.293%
0.000%
0.587%
0.114%
0.075%
0.070%
1.087%
1.167%
1.014%
0.528%
0.206%
1.031%
0.224%
0.381%
0.987%
0.000%
3.421%
0.740%
2.719%
0.436%
0.315%
0.621%
0.220%
3.861%
0.000%
0.000%
0.264%
0.429%
0.617%
0.217%
0.000%
0.630%
0.893%
1.644%
4.527%
0.000%
0.686%
SW
2.740%
0.000%
0.000%
2.083%
2.321%
0.000%
2.564%
33.333%
0.000%
0.862%
0.000%
0.000%
0.000%
0.000%
2.273%
4.698%
6.780%
4.412%
0.000%
0.000%
0.000%
0.000%
0.000%
0.719%
0.000%
9.091%
0.000%
13.514%
2.564%
0.000%
0.847%
1.600%
0.472%
0.000%
0.000%
3.226%
0.000%
0.529%
0.292%
0.000%
0.000%
0.000%
0.000%
1.875%
0.000%
1.386%
Percent of Population Served
with At Least One Detection
Total
7.760%
3.013%
0.200%
5.004%
19.192%
0.001%
1.328%
5.308%
3.892%
0.120%
0.000%
0.197%
0.045%
0.011%
7.706%
9.250%
3.036%
36.273%
0.194%
0.146%
1.625%
0.091%
0.051%
0.243%
0.000%
41.259%
2.084%
13.719%
32.644%
0.044%
0.226%
0.194%
2.724%
0.000%
0.000%
0.275%
0.289%
0.194%
0.197%
0.000%
0.052%
1.016%
10.736%
2.193%
0.000%
6.178%
GW
9.240%
11.315%
0.540%
0.300%
2.977%
0.008%
0.108%
0.233%
4.465%
0.266%
0.000%
0.349%
0.059%
0.035%
4.410%
0.027%
2.864%
0.591%
0.483%
0.528%
2.300%
0.161%
0.105%
0.668%
0.000%
13.289%
4.955%
8.135%
33.643%
0.151%
1.030%
0.024%
11.827%
0.000%
0.000%
0.029%
0.396%
0.359%
0.285%
0.000%
0.438%
2.198%
18.471%
1.018%
0.000%
3.361%
SW
6.839%
0.000%
0.000%
8.901%
29.013%
0.000%
1.531%
12.839%
0.000%
0.081%
0.000%
0.000%
0.000%
0.000%
11.360%
10.069%
3.080%
45.424%
0.000%
0.000%
0.000%
0.000%
0.000%
0.103%
0.000%
65.960%
0.000%
16.727%
27.275%
0.000%
0.008%
0.269%
0.263%
0.000%
0.000%
0.344%
0.000%
0.136%
0.145%
0.000%
0.000%
0.000%
0.000%
2.430%
0.000%
7.909%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A24c. 1,2-Dichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 5 ug/L
Total
0
0
1
0
5
1
2
1
0
0
0
0
0
0
0
0
1
2
1
2
1
0
0
3
0
2
2
3
0
0
2
0
0
0
0
0
0
0
4
0
1
0
2
0
0
36
GW
0
0
1
0
4
1
2
0
0
0
0
0
0
0
0
0
0
2
1
2
1
0
0
3
0
2
2
3
0
0
2
0
0
0
0
0
0
0
4
0
1
0
2
0
0
33
SW
0
0
0
0
1
0
0
1
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3
Percent of Systems
with At Least One Detection
> 5 ug/L
Total
0.000%
0.000%
0.220%
0.000%
0.137%
0.121%
0.166%
0.314%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.139%
0.190%
0.123%
0.067%
0.063%
0.000%
0.000%
0.127%
0.000%
0.259%
0.159%
0.215%
0.000%
0.000%
0.131%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.081%
0.000%
0.063%
0.000%
0.112%
0.000%
0.000%
0.071%
GW
0.000%
0.000%
0.262%
0.000%
0.128%
0.165%
0.171%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.203%
0.132%
0.069%
0.064%
0.000%
0.000%
0.135%
0.000%
0.263%
0.164%
0.220%
0.000%
0.000%
0.155%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.087%
0.000%
0.070%
0.000%
0.113%
0.000%
0.000%
0.071%
SW
0.000%
0.000%
0.000%
0.000%
0.193%
0.000%
0.000%
33.333%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.847%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.070%
Population Served by Systems
with At Least One Detection
> 5 ug/L
Total
0
0
240
0
189,990
40
250
36,130
0
0
0
0
0
0
0
0
49,510
75
45
396
52,612
0
0
4,152
0
387
82
83,427
0
0
1,735
0
0
0
0
0
0
0
18,221
0
80
0
840
0
0
438,212
GW
0
0
240
0
84,658
40
250
0
0
0
0
0
0
0
0
0
0
75
45
396
52,612
0
0
4,152
0
387
82
83,427
0
0
1,735
0
0
0
0
0
0
0
18,221
0
80
0
840
0
0
247,240
SW
0
0
0
0
105,332
0
0
36,130
0
0
0
0
0
0
0
0
49,510
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
190,972
Percent of Population Served
with At Least One Detection
> 5 ug/L
Total
0.000%
0.000%
0.010%
0.000%
0.530%
0.001%
0.009%
5.169%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.579%
0.001%
0.006%
0.006%
1.235%
0.000%
0.000%
0.059%
0.000%
0.026%
0.009%
1.077%
0.000%
0.000%
0.035%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.073%
0.000%
0.002%
0.000%
0.021%
0.000%
0.000%
0.193%
GW
0.000%
0.000%
0.026%
0.000%
0.626%
0.008%
0.064%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
0.015%
0.020%
1.747%
0.000%
0.000%
0.240%
0.000%
0.056%
0.021%
3.076%
0.000%
0.000%
0.166%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.196%
0.000%
0.013%
0.000%
0.036%
0.000%
0.000%
0.286%
SW
0.000%
0.000%
0.000%
0.000%
0.472%
0.000%
0.000%
12.839%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.727%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.136%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A24d. 1,2-Dichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2.5 ug/L
Total
0
0
1
0
10
1
2
1
1
2
0
0
0
0
0
0
2
5
1
3
1
0
1
7
0
2
2
5
0
0
2
2
5
0
0
0
0
0
7
0
1
0
2
0
0
66
GW
0
0
1
0
7
1
2
0
1
1
0
0
0
0
0
0
0
5
1
3
1
0
1
7
0
2
2
5
0
0
2
1
5
0
0
0
0
0
7
0
1
0
2
0
0
58
SW
0
0
0
0
3
0
0
1
0
1
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
8
Percent of Systems
with At Least One Detection
> 2.5 ug/L
Total
0.000%
0.000%
0.220%
0.000%
0.274%
0.121%
0.166%
0.314%
0.066%
0.110%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.279%
0.474%
0.123%
0.101%
0.063%
0.000%
0.118%
0.296%
0.000%
0.259%
0.159%
0.358%
0.000%
0.000%
0.131%
0.103%
0.685%
0.000%
0.000%
0.000%
0.000%
0.000%
0.141%
0.000%
0.063%
0.000%
0.112%
0.000%
0.000%
0.131%
GW
0.000%
0.000%
0.262%
0.000%
0.223%
0.165%
0.171%
0.000%
0.067%
0.059%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.507%
0.132%
0.103%
0.064%
0.000%
0.127%
0.314%
0.000%
0.263%
0.164%
0.367%
0.000%
0.000%
0.155%
0.055%
0.965%
0.000%
0.000%
0.000%
0.000%
0.000%
0.152%
0.000%
0.070%
0.000%
0.113%
0.000%
0.000%
0.126%
SW
0.000%
0.000%
0.000%
0.000%
0.580%
0.000%
0.000%
33.333%
0.000%
0.862%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.695%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.800%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.188%
Population Served by Systems
with At Least One Detection
> 2.5 ug/L
Total
0
0
240
0
4,409,379
40
250
36,130
1,400
5,187
0
0
0
0
0
0
100,344
624
45
796
52,612
0
207
4,724
0
387
82
109,654
0
0
1,735
211
3,765
0
0
0
0
0
21,871
0
80
0
840
0
0
4,750,603
GW
0
0
240
0
138,080
40
250
0
1,400
437
0
0
0
0
0
0
0
624
45
796
52,612
0
207
4,724
0
387
82
109,654
0
0
1,735
125
3,765
0
0
0
0
0
21,871
0
80
0
840
0
0
337,994
SW
0
0
0
0
4,271,299
0
0
36,130
0
4,750
0
0
0
0
0
0
100,344
0
0
0
0
0
0
0
0
0
0
0
0
0
0
86
0
0
0
0
0
0
0
0
0
0
0
0
0
4,412,609
Percent of Population Served
with At Least One Detection
> 2.5 ug/L
Total
0.000%
0.000%
0.010%
0.000%
12.307%
0.001%
0.009%
5.169%
0.008%
0.069%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.173%
0.012%
0.006%
0.011%
1.235%
0.000%
0.027%
0.068%
0.000%
0.026%
0.009%
1.415%
0.000%
0.000%
0.035%
0.002%
0.121%
0.000%
0.000%
0.000%
0.000%
0.000%
0.087%
0.000%
0.002%
0.000%
0.021%
0.000%
0.000%
2.093%
GW
0.000%
0.000%
0.026%
0.000%
1.022%
0.008%
0.064%
0.000%
0.009%
0.027%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.061%
0.015%
0.040%
1.747%
0.000%
0.057%
0.273%
0.000%
0.056%
0.021%
4.042%
0.000%
0.000%
0.166%
0.004%
0.566%
0.000%
0.000%
0.000%
0.000%
0.000%
0.235%
0.000%
0.013%
0.000%
0.036%
0.000%
0.000%
0.391%
SW
0.000%
0.000%
0.000%
0.000%
19.143%
0.000%
0.000%
12.839%
0.000%
0.081%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.474%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.140%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A24e. 1,2-Dichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>lug/L
Total
2
4
1
2
19
1
3
1
1
5
0
1
0
0
1
1
8
9
3
4
5
2
1
13
0
11
6
13
0
0
3
3
11
0
0
3
1
0
11
0
7
2
5
1
0
164
GW
1
4
1
2
12
1
2
0
1
4
0
1
0
0
1
0
3
7
3
4
5
2
1
13
0
11
6
12
0
0
3
1
11
0
0
2
1
0
10
0
7
2
5
0
0
139
SW
1
0
0
0
7
0
1
1
0
1
0
0
0
0
0
1
5
2
0
0
0
0
0
0
0
0
0
1
0
0
0
2
0
0
0
1
0
0
1
0
0
0
0
1
0
25
Percent of Systems
with At Least One Detection
> 1 ug/L
Total
0.323%
1.521%
0.220%
0.189%
0.520%
0.121%
0.249%
0.314%
0.066%
0.274%
0.000%
0.095%
0.000%
0.000%
0.068%
0.415%
1.114%
0.854%
0.370%
0.135%
0.316%
0.141%
0.118%
0.549%
0.000%
1.427%
0.477%
0.930%
0.000%
0.000%
0.197%
0.154%
1.507%
0.000%
0.000%
0.366%
0.408%
0.000%
0.222%
0.000%
0.438%
0.332%
0.280%
0.248%
0.000%
0.325%
GW
0.211%
1.980%
0.262%
0.198%
0.383%
0.165%
0.171%
0.000%
0.067%
0.234%
0.000%
0.098%
0.000%
0.000%
0.070%
0.000%
0.500%
0.710%
0.396%
0.137%
0.322%
0.149%
0.127%
0.583%
0.000%
1.447%
0.493%
0.882%
0.000%
0.000%
0.233%
0.055%
2.124%
0.000%
0.000%
0.264%
0.429%
0.000%
0.217%
0.000%
0.490%
0.357%
0.283%
0.000%
0.000%
0.301%
SW
0.685%
0.000%
0.000%
0.000%
1.354%
0.000%
2.564%
33.333%
0.000%
0.862%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
4.237%
2.941%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.703%
0.000%
0.000%
0.000%
1.600%
0.000%
0.000%
0.000%
1.613%
0.000%
0.000%
0.292%
0.000%
0.000%
0.000%
0.000%
0.625%
0.000%
0.587%
Population Served by Systems
with At Least One Detection
>lug/L
Total
33,311
101,319
240
7,690
5,136,792
40
35,983
36,130
1,400
7,870
0
372
0
0
113,400
48,800
192,347
109,717
1,198
2,554
54,141
720
207
6,561
0
27,686
19,230
248,452
0
0
5,809
19,181
5,424
0
0
8,589
770
0
49,470
0
1,712
4,746
3,276
1,800
0
6,286,937
GW
9,046
101,319
240
7,690
247,386
40
250
0
1,400
3,120
0
372
0
0
113,400
0
37,968
3,634
1,198
2,554
54,141
720
207
6,561
0
27,686
19,230
171,795
0
0
5,809
125
5,424
0
0
209
770
0
26,470
0
1,712
4,746
3,276
0
0
858,498
SW
24,265
0
0
0
4,889,406
0
35,733
36,130
0
4,750
0
0
0
0
0
48,800
154,379
106,083
0
0
0
0
0
0
0
0
0
76,657
0
0
0
19,056
0
0
0
8,380
0
0
23,000
0
0
0
0
1,800
0
5,428,439
Percent of Population Served
with At Least One Detection
>lug/L
Total
5.495%
2.402%
0.010%
0.125%
14.337%
0.001%
1.321%
5.169%
0.008%
0.105%
0.000%
0.015%
0.000%
0.000%
2.318%
1.060%
2.248%
2.184%
0.164%
0.036%
1.271%
0.024%
0.027%
0.094%
0.000%
1.893%
2.027%
3.206%
0.000%
0.000%
0.119%
0.188%
0.174%
0.000%
0.000%
0.256%
0.289%
0.000%
0.197%
0.000%
0.032%
0.967%
0.081%
0.127%
0.000%
2.770%
GW
3.889%
9.021%
0.026%
0.275%
1.830%
0.008%
0.064%
0.000%
0.009%
0.196%
0.000%
0.026%
0.000%
0.000%
4.410%
0.000%
2.170%
0.354%
0.409%
0.129%
1.798%
0.043%
0.057%
0.379%
0.000%
4.038%
4.820%
6.333%
0.000%
0.000%
0.556%
0.004%
0.816%
0.000%
0.000%
0.029%
0.396%
0.000%
0.285%
0.000%
0.271%
2.090%
0.140%
0.000%
0.000%
0.994%
SW
6.495%
0.000%
0.000%
0.000%
21.913%
0.000%
1.531%
12.839%
0.000%
0.081%
0.000%
0.000%
0.000%
0.000%
0.000%
1.154%
2.268%
2.653%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.522%
0.000%
0.000%
0.000%
0.269%
0.000%
0.000%
0.000%
0.319%
0.000%
0.000%
0.145%
0.000%
0.000%
0.000%
0.000%
0.153%
0.000%
3.863%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A24f. 1,2-Dichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.5 ug/L
Total
5
6
1
4
30
1
6
4
1
6
0
4
1
1
2
1
13
12
3
6
8
3
3
22
0
13
9
19
2
1
4
5
19
0
0
4
1
2
11
0
9
4
8
1
0
255
GW
2
6
1
4
19
1
5
3
1
5
0
4
1
1
1
0
6
10
3
6
8
3
3
21
0
13
9
16
1
1
4
3
18
0
0
2
1
1
10
0
9
4
8
0
0
214
SW
3
0
0
0
11
0
1
1
0
1
0
0
0
0
1
1
7
2
0
0
0
0
0
1
0
0
0
3
1
0
0
2
1
0
0
2
0
1
1
0
0
0
0
1
0
41
Percent of Systems
with At Least One Detection
> 0.5 ug/L
Total
0.806%
2.281%
0.220%
0.378%
0.821%
0.121%
0.497%
1.258%
0.066%
0.329%
0.000%
0.379%
0.107%
0.070%
0.136%
0.415%
1.811%
1.139%
0.370%
0.202%
0.506%
0.212%
0.354%
0.929%
0.000%
1.686%
0.715%
1.359%
0.275%
0.296%
0.262%
0.257%
2.603%
0.000%
0.000%
0.488%
0.408%
0.570%
0.222%
0.000%
0.563%
0.663%
0.448%
0.248%
0.000%
0.506%
GW
0.422%
2.970%
0.262%
0.396%
0.606%
0.165%
0.428%
0.952%
0.067%
0.293%
0.000%
0.391%
0.114%
0.075%
0.070%
0.000%
1.000%
1.014%
0.396%
0.206%
0.515%
0.224%
0.381%
0.943%
0.000%
1.711%
0.740%
1.176%
0.145%
0.315%
0.310%
0.165%
3.475%
0.000%
0.000%
0.264%
0.429%
0.617%
0.217%
0.000%
0.630%
0.714%
0.454%
0.000%
0.000%
0.463%
SW
2.055%
0.000%
0.000%
0.000%
2.128%
0.000%
2.564%
33.333%
0.000%
0.862%
0.000%
0.000%
0.000%
0.000%
2.273%
0.671%
5.932%
2.941%
0.000%
0.000%
0.000%
0.000%
0.000%
0.719%
0.000%
0.000%
0.000%
8.108%
2.564%
0.000%
0.000%
1.600%
0.472%
0.000%
0.000%
3.226%
0.000%
0.529%
0.292%
0.000%
0.000%
0.000%
0.000%
0.625%
0.000%
0.963%
Population Served by Systems
with At Least One Detection
> 0.5 ug/L
Total
34,651
127,086
240
8,376
6,711,489
40
36,153
37,104
1,400
8,990
0
1,533
490
1,059
376,920
48,800
243,849
112,146
1,198
10,436
59,856
2,720
384
14,730
0
34,402
19,770
554,311
101,451
427
6,309
19,506
83,183
0
0
9,239
770
11,004
49,470
0
2,762
4,915
212,465
1,800
0
8,951,434
GW
9,211
127,086
240
8,376
394,381
40
420
974
1,400
4,240
0
1,533
490
1,059
113,400
0
50,023
6,063
1,198
10,436
59,856
2,720
384
9,292
0
34,402
19,770
177,114
28,750
427
6,309
450
76,713
0
0
209
770
5,254
26,470
0
2,762
4,915
212,465
0
0
1,399,602
SW
25,440
0
0
0
6,317,108
0
35,733
36,130
0
4,750
0
0
0
0
263,520
48,800
193,826
106,083
0
0
0
0
0
5,438
0
0
0
377,197
72,701
0
0
19,056
6,470
0
0
9,030
0
5,750
23,000
0
0
0
0
1,800
0
7,551,832
Percent of Population Served
with At Least One Detection
> 0.5 ug/L
Total
5.716%
3.013%
0.010%
0.136%
18.732%
0.001%
1.328%
5.308%
0.008%
0.120%
0.000%
0.060%
0.045%
0.011%
7.706%
1.060%
2.850%
2.232%
0.164%
0.146%
1.405%
0.091%
0.051%
0.210%
0.000%
2.353%
2.084%
7.154%
5.971%
0.044%
0.129%
0.191%
2.663%
0.000%
0.000%
0.275%
0.289%
0.194%
0.197%
0.000%
0.052%
1.001%
5.260%
0.127%
0.000%
3.945%
GW
3.960%
11.315%
0.026%
0.300%
2.918%
0.008%
0.108%
0.233%
0.009%
0.266%
0.000%
0.107%
0.059%
0.035%
4.410%
0.000%
2.859%
0.591%
0.409%
0.528%
1.988%
0.161%
0.105%
0.536%
0.000%
5.017%
4.955%
6.529%
2.007%
0.151%
0.604%
0.014%
11.539%
0.000%
0.000%
0.029%
0.396%
0.359%
0.285%
0.000%
0.438%
2.165%
9.050%
0.000%
0.000%
1.620%
SW
6.809%
0.000%
0.000%
0.000%
28.312%
0.000%
1.531%
12.839%
0.000%
0.081%
0.000%
0.000%
0.000%
0.000%
11.360%
1.154%
2.847%
2.653%
0.000%
0.000%
0.000%
0.000%
0.000%
0.103%
0.000%
0.000%
0.000%
7.490%
27.275%
0.000%
0.000%
0.269%
0.263%
0.000%
0.000%
0.344%
0.000%
0.136%
0.145%
0.000%
0.000%
0.000%
0.000%
0.153%
0.000%
5.373%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A25. 1,1-Dichloroethylene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 7 ug/L
> 3.5 ug/L
> 7 ug/L
> 3.5 ug/L
> 7 ug/L
> 3.5 ug/L
Total # Systems
Reporting
46,171
46,171
4,254
4,254
50,425
50,425
# Systems Exceeding
Threshold of Interest
24
52
9
16
33
68
% Systems Exceeding
Threshold of Interest
0.052%
0.113%
0.212%
0.376%
0.065%
0.135%
Total Pop. Served by
Systems Reporting
86,395,257
86,395,257
140,514,407
140,514,407
226,909,664
226,909,664
Total Pop. Served by
Systems Exceeding
Threshold of Interest
261,170
922,641
5,451,023
6,853,605
5,712,193
7,776,246
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.302%
1.068%
3.879%
4.878%
2.517%
3.427%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A25a. 1,1-Dichloroethylene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,100
879
2,383
12,599
90,526
2,863
6,936
1,048
4,165
7,175
1,791
1,761
3,758
7,007
4,620
3,308
16,249
6,773
3,698
10,752
8,582
7,544
4,492
19,067
552
6,844
9,590
20,354
6,578
3,192
7,069
8,808
5,636
2,327
1,959
4,343
889
2,946
34,148
8,991
4,895
4,344
11,292
1,138
1,659
378,630
GW
1,963
647
1,915
9,538
47,264
2,124
6,045
1,018
4,098
6,349
1,688
1,636
3,297
6,447
4,311
1,124
12,259
5,511
3,383
9,742
7,333
6,695
3,953
17,487
417
6,265
9,112
18,566
6,102
2,570
5,404
7,672
4,201
1,684
1,591
3,804
855
1,166
27,044
7,560
4,028
3,953
11,167
443
1,156
290,587
SW
1,137
232
468
3,061
43,262
739
891
30
67
826
103
125
461
560
309
2,184
3,990
1,262
315
1,010
1,249
849
539
1,580
135
579
478
1,788
476
622
1,665
1,136
1,435
643
368
539
34
1,780
7,104
1,431
867
391
125
695
503
88,043
Percent of Samples
with Detections
Total
0.032%
8.987%
0.042%
0.667%
4.752%
0.140%
0.793%
0.095%
1.273%
0.223%
0.000%
0.000%
0.027%
0.371%
0.065%
0.121%
0.831%
0.664%
0.135%
0.009%
0.245%
0.133%
0.067%
0.850%
0.000%
0.628%
0.469%
0.889%
0.517%
0.407%
0.481%
0.045%
0.497%
0.473%
1.225%
0.806%
0.000%
0.407%
0.143%
0.145%
1.021%
0.552%
0.708%
1.582%
0.000%
1.508%
GW
0.000%
10.201%
0.000%
0.849%
2.272%
0.094%
0.562%
0.098%
1.293%
0.252%
0.000%
0.000%
0.030%
0.403%
0.070%
0.000%
0.653%
0.581%
0.148%
0.010%
0.286%
0.149%
0.076%
0.921%
0.000%
0.686%
0.428%
0.899%
0.557%
0.506%
0.574%
0.039%
0.643%
0.653%
1.508%
0.920%
0.000%
1.029%
0.181%
0.172%
1.241%
0.607%
0.716%
2.483%
0.000%
0.804%
SW
0.088%
5.603%
0.214%
0.098%
7.462%
0.271%
2.357%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.183%
1.378%
1.030%
0.000%
0.000%
0.000%
0.000%
0.000%
0.063%
0.000%
0.000%
1.255%
0.783%
0.000%
0.000%
0.180%
0.088%
0.070%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.007%
0.000%
3.832%
Minimum Detect
Concentration (u.g/L)
Total
0.8
0.5
0.12
0.31
0.31
0.13
0.2
0.56
0.14
0.52
0.3
0.37
0.6
0.5
0.4
0.5
0.5
0.7
0.5
0.52
0.65
0.5
0.12
0.5
0.2
0.2
0.5
0.5
0.6
0.49
0.5
0.5
0.5
0.7
0.6
0.5
0.5
0.6
0.054
0.08
0.054
GW
0.5
0.31
0.31
0.13
0.53
0.56
0.14
0.52
0.3
0.37
0.6
0.4
0.5
0.5
0.7
0.5
0.52
0.65
0.5
0.12
0.5
0.2
0.2
0.5
0.5
0.6
0.49
0.5
0.5
0.5
0.7
0.6
0.5
0.5
0.6
0.054
0.08
0.054
SW
0.8
0.5
0.12
0.5
0.5
0.2
0.2
0.5
0.5
0.6
5.4
1
0.5
0.5
0.97
0.5
0.3
0.12
Median Detect
Concentration (u.g/L)
Total
0.8
1.33
0.12
0.76
2.1
0.25
1.2
0.56
1.2
0.685
0.3
0.8
0.6
0.5
1.2
0.8
6.1
0.7
0.7
0.72
1.6
1.2
0.86
1.6
0.74
0.5
0.81
3.55
0.835
0.675
0.8
0.84
1.23
1.4
2.1
0.6
1
1.8
0.602
0.5
1.7
GW
1.685
0.8
1.5
0.215
2.15
0.56
1.2
0.685
0.3
0.8
0.6
1.05
0.8
6.1
0.7
0.7
0.72
1.6
1.2
0.86
1.4
0.8
0.5
0.81
5.4
0.7
0.7
0.8
0.84
1.23
1.4
2.1
0.6
1
1.8
0.602
0.5
1.1
SW
0.8
1.01
0.12
0.5
2.25
0.36
0.7
0.5
1.6
0.9
5.4
2.35
0.6
0.5
0.97
0.5
1
2.145
90th Percentile Detect
Concentration (u.g/L)
Total
0.8
6.8
0.12
3.4
9.3
0.52
4.3
0.56
3.57
0.74
0.3
2.38
0.99
1
6
1.8
8
0.7
1.1
1.465
2.3
5.4
3.2
3.1
2.1
1.12
1.03
8.9
2.44
1.1
1
1.5
3.71
4.9
8.1
2.3
4.85
2
7.9
1.1
8
GW
7.1
3.4
21
0.3
7.5
0.56
3.57
0.74
0.3
2.38
0.99
5.25
1
8
0.7
1.1
1.465
2.3
5
3.2
3.3
2.17
1.12
1.03
8.9
2.44
1.1
1
1.5
3.71
4.9
8.1
2.3
4.85
2
7.9
0.5
8.4
SW
0.8
1.63
0.12
0.5
7.94
0.52
1.3
1
13
1.8
5.4
3.1
1.1
1.2
0.97
0.5
1.2
7.9
Maximum Detect
Concentration (u.g/L)
Total
0.8
20
0.12
5.4
67
0.52
15
0.56
9
0.78
0.3
3.92
0.99
1
18
3.8
8
0.7
1.9
1.7
2.3
214
13
6.09
23.16
1.532
5.88
12
2.44
2
1.1
3
10.9
5
10
2.3
6.6
3
13
1.2
214
GW
20
5.4
64
0.3
15
0.56
9
0.78
0.3
3.92
0.99
15
3.8
8
0.7
1.9
1.7
2.3
214
13
6.09
23.16
1.532
5.88
12
2.44
2
1.1
3
10.9
5
10
2.3
6.6
3
13
0.9
214
SW
0.8
1.67
0.12
0.5
67
0.52
1.7
1
18
3.8
5.4
3.1
1.7
1.2
0.97
0.5
1.2
67
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A25b. 1,1-Dichloroethylene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
263
454
1,059
3,649
826
1,207
318
1,510
1,822
106
1,056
935
1,429
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
210
771
1,258
1,398
727
338
1,520
1,943
730
1,098
145
819
245
351
4,951
500
1,590
603
1,784
403
304
50,425
GW
474
202
382
1,011
3,134
605
1,168
315
1,484
1,706
94
1,023
878
1,325
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
183
760
1,217
1,361
688
317
1,284
1,818
518
946
136
757
233
162
4,609
454
1,420
560
1,764
243
256
46,171
SW
146
61
72
48
515
221
39
3
26
116
12
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
170
43
20
160
48
4,254
Total Population Served by Systems
Reporting
Total
606,193
4,218,278
2,453,348
6,166,873
35,802,195
4,997,841
2,723,376
698,987
17,497,764
7,485,298
1,293,745
2,543,141
1,093,666
9,217,431
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,748,495
1,698,980
973,592
4,894,535
10,227,535
3,123,687
2,940,189
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,269,789
491,035
4,039,526
1,416,020
446,177
226,909,664
GW
232,590
1,123,190
910,322
2,796,282
13,515,377
530,207
389,454
417,587
15,251,722
1,592,517
1,239,117
1,434,515
837,604
3,017,034
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,712,549
1,432,432
283,701
1,043,933
3,132,598
664,833
574,759
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
628,354
227,067
2,347,782
237,670
129,229
86,395,257
SW
373,603
3,095,088
1,543,026
3,370,591
22,286,818
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,641,435
263,968
1,691,744
1,178,350
316,948
140,514,407
Percent of Systems
with At Least One Detection
Total
0.161%
3.042%
0.220%
0.472%
1.809%
0.484%
1.077%
0.314%
0.728%
0.110%
0.000%
0.000%
0.107%
0.140%
0.204%
1.660%
2.089%
0.474%
0.370%
0.034%
0.253%
0.141%
0.118%
1.352%
0.000%
1.167%
1.113%
3.433%
0.825%
0.888%
0.592%
0.154%
0.959%
0.182%
2.069%
1.099%
0.000%
0.570%
0.162%
0.200%
0.503%
0.663%
0.673%
3.474%
0.000%
0.688%
GW
0.000%
2.970%
0.000%
0.396%
1.436%
0.331%
0.942%
0.317%
0.741%
0.117%
0.000%
0.000%
0.114%
0.151%
0.210%
0.000%
2.167%
0.406%
0.396%
0.034%
0.258%
0.149%
0.127%
1.391%
0.000%
1.184%
1.068%
3.306%
0.872%
0.946%
0.467%
0.110%
1.158%
0.211%
2.206%
1.189%
0.000%
1.235%
0.174%
0.220%
0.563%
0.714%
0.680%
4.527%
0.000%
0.643%
SW
0.685%
3.279%
1.389%
2.083%
4.078%
0.905%
5.128%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.685%
1.695%
1.471%
0.000%
0.000%
0.000%
0.000%
0.000%
0.719%
0.000%
0.000%
2.439%
8.108%
0.000%
0.000%
1.271%
0.800%
0.472%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.875%
0.000%
1.175%
Percent of Population Served
with At Least One Detection
Total
0.004%
7.889%
0.594%
5.828%
25.966%
0.084%
3.317%
0.020%
3.713%
0.014%
0.000%
0.000%
0.073%
1.689%
1.192%
2.376%
1.763%
0.277%
0.058%
0.001%
1.757%
0.068%
0.013%
0.861%
0.000%
6.397%
1.436%
11.276%
28.983%
0.057%
5.876%
0.003%
2.565%
1.039%
0.537%
0.271%
0.000%
0.120%
0.016%
0.051%
0.024%
0.062%
2.965%
2.260%
0.000%
5.917%
GW
0.000%
5.885%
0.000%
2.125%
12.796%
0.739%
0.891%
0.034%
4.260%
0.064%
0.000%
0.000%
0.096%
5.161%
2.267%
0.000%
7.102%
0.968%
0.145%
0.002%
2.487%
0.120%
0.026%
2.040%
0.000%
13.640%
0.281%
8.391%
34.376%
0.195%
1.566%
0.003%
0.834%
5.316%
2.823%
1.242%
0.000%
0.466%
0.042%
0.077%
0.200%
0.133%
5.102%
1.418%
0.000%
4.623%
SW
0.007%
8.616%
0.944%
8.901%
33.952%
0.006%
3.722%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.587%
0.390%
0.100%
0.000%
0.000%
0.000%
0.000%
0.000%
0.472%
0.000%
0.000%
2.274%
12.829%
0.000%
0.000%
7.045%
0.003%
3.033%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.430%
0.000%
6.713%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A25c. 1,1-Dichloroethylene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 7 ug/L
Total
0
2
0
0
12
0
2
0
1
0
0
0
0
0
0
0
3
0
1
0
0
0
0
4
0
1
0
2
0
0
1
0
0
0
0
1
0
0
2
0
0
0
1
0
0
33
GW
0
2
0
0
4
0
2
0
1
0
0
0
0
0
0
0
2
0
1
0
0
0
0
4
0
1
0
2
0
0
1
0
0
0
0
1
0
0
2
0
0
0
1
0
0
24
SW
0
0
0
0
8
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
9
Percent of Systems
with At Least One Detection
> 7 ug/L
Total
0.000%
0.760%
0.000%
0.000%
0.329%
0.000%
0.166%
0.000%
0.066%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.418%
0.000%
0.123%
0.000%
0.000%
0.000%
0.000%
0.169%
0.000%
0.130%
0.000%
0.143%
0.000%
0.000%
0.066%
0.000%
0.000%
0.000%
0.000%
0.122%
0.000%
0.000%
0.040%
0.000%
0.000%
0.000%
0.056%
0.000%
0.000%
0.065%
GW
0.000%
0.990%
0.000%
0.000%
0.128%
0.000%
0.171%
0.000%
0.067%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.333%
0.000%
0.132%
0.000%
0.000%
0.000%
0.000%
0.180%
0.000%
0.132%
0.000%
0.147%
0.000%
0.000%
0.078%
0.000%
0.000%
0.000%
0.000%
0.132%
0.000%
0.000%
0.043%
0.000%
0.000%
0.000%
0.057%
0.000%
0.000%
0.052%
SW
0.000%
0.000%
0.000%
0.000%
1.553%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.847%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.212%
Population Served by Systems
with At Least One Detection
> 7 ug/L
Total
0
16,437
0
0
5,568,022
0
60
0
2,250
0
0
0
0
0
0
0
51,664
0
150
0
0
0
0
3,837
0
40,311
0
151
0
0
13,500
0
0
0
0
111
0
0
2,390
0
0
0
13,310
0
0
5,712,193
GW
0
16,437
0
0
140,423
0
60
0
2,250
0
0
0
0
0
0
0
28,240
0
150
0
0
0
0
3,837
0
40,311
0
151
0
0
13,500
0
0
0
0
111
0
0
2,390
0
0
0
13,310
0
0
261,170
SW
0
0
0
0
5,427,599
0
0
0
0
0
0
0
0
0
0
0
23,424
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5,451,023
Percent of Population Served
with At Least One Detection
> 7 ug/L
Total
0.000%
0.390%
0.000%
0.000%
15.552%
0.000%
0.002%
0.000%
0.013%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.604%
0.000%
0.021%
0.000%
0.000%
0.000%
0.000%
0.055%
0.000%
2.757%
0.000%
0.002%
0.000%
0.000%
0.276%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.010%
0.000%
0.000%
0.000%
0.329%
0.000%
0.000%
2.517%
GW
0.000%
1.463%
0.000%
0.000%
1.039%
0.000%
0.015%
0.000%
0.015%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.614%
0.000%
0.051%
0.000%
0.000%
0.000%
0.000%
0.221%
0.000%
5.879%
0.000%
0.006%
0.000%
0.000%
1.293%
0.000%
0.000%
0.000%
0.000%
0.015%
0.000%
0.000%
0.026%
0.000%
0.000%
0.000%
0.567%
0.000%
0.000%
0.302%
SW
0.000%
0.000%
0.000%
0.000%
24.353%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.344%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.879%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A25d. 1,1-Dichloroethylene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 3.5 ug/L
Total
0
2
0
1
22
0
3
0
2
0
0
0
0
1
0
0
3
2
1
0
0
0
0
9
0
2
2
4
0
1
2
0
0
0
0
2
0
1
4
0
3
0
1
0
0
68
GW
0
2
0
1
9
0
3
0
2
0
0
0
0
1
0
0
2
1
1
0
0
0
0
8
0
2
2
4
0
1
2
0
0
0
0
2
0
1
4
0
3
0
1
0
0
52
SW
0
0
0
0
13
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
Percent of Systems
with At Least One Detection
> 3.5 ug/L
Total
0.000%
0.760%
0.000%
0.094%
0.603%
0.000%
0.249%
0.000%
0.132%
0.000%
0.000%
0.000%
0.000%
0.070%
0.000%
0.000%
0.418%
0.190%
0.123%
0.000%
0.000%
0.000%
0.000%
0.380%
0.000%
0.259%
0.159%
0.286%
0.000%
0.296%
0.132%
0.000%
0.000%
0.000%
0.000%
0.244%
0.000%
0.285%
0.081%
0.000%
0.189%
0.000%
0.056%
0.000%
0.000%
0.135%
GW
0.000%
0.990%
0.000%
0.099%
0.287%
0.000%
0.257%
0.000%
0.135%
0.000%
0.000%
0.000%
0.000%
0.075%
0.000%
0.000%
0.333%
0.101%
0.132%
0.000%
0.000%
0.000%
0.000%
0.359%
0.000%
0.263%
0.164%
0.294%
0.000%
0.315%
0.156%
0.000%
0.000%
0.000%
0.000%
0.264%
0.000%
0.617%
0.087%
0.000%
0.211%
0.000%
0.057%
0.000%
0.000%
0.113%
SW
0.000%
0.000%
0.000%
0.000%
2.524%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.847%
1.471%
0.000%
0.000%
0.000%
0.000%
0.000%
0.719%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.376%
Population Served by Systems
with At Least One Detection
> 3.5 ug/L
Total
0
16,437
0
350
7,118,411
0
90
0
317,766
0
0
0
0
155,650
0
0
51,664
10,200
150
0
0
0
0
31,405
0
40,911
90
1,191
0
427
13,550
0
0
0
0
166
0
1,519
2,461
0
498
0
13,310
0
0
7,776,246
GW
0
16,437
0
350
317,104
0
90
0
317,766
0
0
0
0
155,650
0
0
28,240
6,200
150
0
0
0
0
6,531
0
40,911
90
1,191
0
427
13,550
0
0
0
0
166
0
1,519
2,461
0
498
0
13,310
0
0
922,641
SW
0
0
0
0
6,801,307
0
0
0
0
0
0
0
0
0
0
0
23,424
4,000
0
0
0
0
0
24,874
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6,853,605
Percent of Population Served
with At Least One Detection
> 3.5 ug/L
Total
0.000%
0.390%
0.000%
0.006%
19.883%
0.000%
0.003%
0.000%
1.816%
0.000%
0.000%
0.000%
0.000%
1.689%
0.000%
0.000%
0.604%
0.203%
0.021%
0.000%
0.000%
0.000%
0.000%
0.449%
0.000%
2.798%
0.009%
0.015%
0.000%
0.044%
0.277%
0.000%
0.000%
0.000%
0.000%
0.005%
0.000%
0.027%
0.010%
0.000%
0.009%
0.000%
0.329%
0.000%
0.000%
3.427%
GW
0.000%
1.463%
0.000%
0.013%
2.346%
0.000%
0.023%
0.000%
2.083%
0.000%
0.000%
0.000%
0.000%
5.159%
0.000%
0.000%
1.614%
0.605%
0.051%
0.000%
0.000%
0.000%
0.000%
0.377%
0.000%
5.966%
0.023%
0.044%
0.000%
0.151%
1.298%
0.000%
0.000%
0.000%
0.000%
0.023%
0.000%
0.104%
0.026%
0.000%
0.079%
0.000%
0.567%
0.000%
0.000%
1.068%
SW
0.000%
0.000%
0.000%
0.000%
30.517%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.344%
0.100%
0.000%
0.000%
0.000%
0.000%
0.000%
0.472%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.878%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A26. cis-l,2-Dichloroethylene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 70 ug/L
> 35 ug/L
> 70 ug/L
> 35 ug/L
> 70 ug/L
> 35 ug/L
Total # Systems
Reporting
46,072
46,072
4,242
4,242
50,314
50,314
# Systems Exceeding
Threshold of Interest
3
10
2
3
5
13
% Systems Exceeding
Threshold of Interest
0.007%
0.022%
0.047%
0.071%
0.010%
0.026%
Total Pop. Served by
Systems Reporting
85,155,955
85,155,955
140,459,779
140,459,779
225,615,734
225,615,734
Total Pop. Served by
Systems Exceeding
Threshold of Interest
37,997
218,371
128,756
328,756
166,753
547,127
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.045%
0.256%
0.092%
0.234%
0.074%
0.243%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A26a. cis-l,2-Dichloroethylene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,107
894
2,394
11,710
87,763
2,871
6,936
1,053
4,160
7,174
1,812
3,764
7,045
4,621
3,309
16,249
6,770
3,688
10,750
8,590
7,544
4,491
19,067
558
6,841
9,602
20,341
6,577
3,208
7,066
8,853
5,637
2,324
1,959
4,345
889
2,946
34,144
8,987
4,892
4,342
11,293
1,141
1,609
373,316
GW
1,969
628
1,926
9,530
45,927
2,132
6,045
1,023
4,092
6,347
1,671
3,303
6,485
4,311
1,126
12,259
5,510
3,373
9,740
7,341
6,695
3,951
17,487
417
6,265
9,124
18,553
6,101
2,576
5,400
7,692
4,201
1,682
1,591
3,805
855
1,166
27,040
7,556
4,024
3,951
11,168
445
1,123
287,606
SW
1,138
266
468
2,180
41,836
739
891
30
68
827
141
461
560
310
2,183
3,990
1,260
315
1,010
1,249
849
540
1,580
141
576
478
1,788
476
632
1,666
1,161
1,436
642
368
540
34
1,780
7,104
1,431
868
391
125
696
486
85,710
Percent of Samples
with Detections
Total
0.064%
9.843%
0.668%
0.999%
3.989%
0.348%
1.312%
0.760%
4.663%
0.251%
2.373%
0.478%
3.520%
0.887%
0.272%
1.988%
0.665%
0.027%
3.163%
1.467%
0.557%
0.134%
0.645%
1.971%
0.599%
1.208%
1.863%
0.334%
0.000%
2.038%
2.869%
0.781%
0.516%
0.715%
0.207%
0.225%
0.441%
0.070%
0.000%
0.899%
0.645%
3.090%
2.366%
0.000%
1.860%
GW
0.102%
5.892%
0.831%
1.196%
3.244%
0.422%
1.175%
0.782%
4.741%
0.047%
2.095%
0.545%
3.824%
0.719%
0.000%
1.158%
0.799%
0.030%
3.460%
1.689%
0.627%
0.152%
0.703%
0.719%
0.654%
1.260%
1.692%
0.361%
0.000%
1.315%
1.859%
1.047%
0.713%
0.880%
0.237%
0.234%
1.115%
0.067%
0.000%
0.646%
0.709%
3.125%
2.921%
0.000%
1.506%
SW
0.000%
19.173%
0.000%
0.138%
4.807%
0.135%
2.245%
0.000%
0.000%
1.814%
5.674%
0.000%
0.000%
3.226%
0.412%
4.536%
0.079%
0.000%
0.297%
0.160%
0.000%
0.000%
0.000%
5.674%
0.000%
0.209%
3.635%
0.000%
0.000%
4.382%
9.561%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.084%
0.000%
2.074%
0.000%
0.000%
2.011%
0.000%
3.046%
Minimum Detect
Concentration (u.g/L)
Total
0.57
0.23
0.18
0.5
0.21
1.1
0.3
0.85
0.09
0.5
0.5
0.1
0.5
0.5
0.008
0.5
0.8
0.5
0.4
0.2
0.5
1.5
0.5
0.5
0.1
0.05
0.1
0.1
0.3
0.25
0.5
0.5
0.6
0.62
0.52
0.6
0.5
0.5
0.8
0.01
0.24
0.008
GW
0.57
0.23
0.18
0.5
0.21
6.3
0.51
0.85
0.09
0.51
0.5
0.1
0.5
0.6
0.5
0.8
0.5
0.4
0.2
0.5
1.5
0.5
0.5
0.1
0.05
0.1
0.1
0.3
0.5
0.5
0.5
0.6
0.62
0.52
0.6
0.5
0.5
0.8
0.01
0.24
0.01
SW
0.5
0.5
0.4
1.1
0.3
0.5
0.5
0.5
0.008
0.5
1.6
0.4
0.4
1.33
1.4
0.2
0.5
0.25
1.1
1
0.5
0.008
Median Detect
Concentration (u.g/L)
Total
0.605
0.8
0.52
2
1
9.05
1.5
0.91
0.685
1
1.3
0.9
1.64
1.2
0.5
2.2
3.4
0.5
1.2
0.9
1.085
2.35
1.3
1.53
0.7
1.65
1
0.185
1.25
0.67
0.9
0.65
1
0.7
0.53
0.93
1
1.4
1.85
1.6
0.5
1.1
GW
0.605
0.8
0.52
2
0.9
10
3.1
0.91
0.685
0.56
1.4
0.9
1.64
1.6
1.4
3.45
0.5
1.3
0.9
1.085
2.35
1.3
1.03
0.7
1.7
1
0.185
1.2
1.2
0.9
0.65
1
0.7
0.53
0.93
0.9
0.855
1.85
1.6
0.5
1
SW
0.7
0.5
1.3
1.1
0.8
1.1
1.2
0.595
0.5
3.2
1.6
0.4
0.4
1.86
1.4
0.96
1.3
0.45
1.35
4.75
12.75
1.2
90th Percentile Detect
Concentration (u.g/L)
Total
0.64
4.5
0.9
3.2
4.2
12
8.4
1.12
8.1
1.6
2
1.2
7.3
8.7
1
29
8.8
0.5
4.5
5.5
1.45
3.7
7.88
2.09
3
7.6
4.85
0.3
2.9
2.3
1.5
1
1.6
2.28
0.54
1.7
1.7
7.1
2.6
11
21.6
5
GW
0.64
1.3
0.9
3.2
3.4
12
9.8
1.12
8.1
0.57
2.2
1.2
7.3
10
50
8.8
0.5
4.5
5.5
1.45
3.7
7.88
1.12
3
7.6
5.67
0.3
2.3
3.2
1.5
1
1.6
2.28
0.54
1.7
1.7
2.8
2.6
11
0.5
5
SW
4.66
0.5
4.53
1.1
1.8
1.6
1.4
1.15
1
13
1.6
0.4
0.4
2.86
1.4
1.4
3.2
0.63
1.9
10
28.4
5
Maximum Detect
Concentration (u.g/L)
Total
0.64
14.1
0.95
4.4
160
12
39
1.12
29
1.8
6.2
1.5
21
13.3
1
151
10.6
0.5
46.2
24
1.6
3.7
70
2.86
8.5
31
61
0.4
20
15
4.24
3.1
4.7
2.28
0.54
1.8
120
11
5.3
220
32.5
220
GW
0.64
2.6
0.95
4.4
33.2
12
39
1.12
29
0.57
6.2
1.5
21
13.3
151
10.6
0.5
46.2
24
1.6
3.7
70
1.12
8.5
31
61
0.4
20
15
4.24
3.1
4.7
2.28
0.54
1.8
120
3.2
5.3
220
0.8
220
SW
14.1
0.5
160
1.1
2
1.8
1.4
1.2
1
108
1.6
0.4
0.4
2.86
1.4
2.3
4.3
0.8
1.9
11
32.5
160
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A26b. cis-l,2-Dichloroethylene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
263
454
1,059
3,645
826
1,207
318
1,510
1,822
1,056
935
1,429
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
210
771
1,258
1,398
727
338
1,520
1,944
730
1,097
145
819
245
351
4,951
500
1,589
603
1,784
403
304
50,314
GW
474
202
382
1,011
3,130
605
1,168
315
1,484
1,706
1,023
878
1,325
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
183
760
1,217
1,361
688
317
1,284
1,819
518
945
136
757
233
162
4,609
454
1,419
560
1,764
243
256
46,072
SW
146
61
72
48
515
221
39
3
26
116
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
170
43
20
160
48
4,242
Total Population Served by Systems
Reporting
Total
606,193
4,218,278
2,453,348
6,166,873
35,801,891
4,997,841
2,723,376
698,987
17,497,764
7,485,298
2,543,141
1,093,666
9,217,431
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,748,495
1,698,980
973,592
4,894,535
10,227,597
3,123,687
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,269,916
491,035
4,039,526
1,416,020
446,177
225,615,734
GW
232,590
1,123,190
910,322
2,796,282
13,515,073
530,207
389,454
417,587
15,251,722
1,592,517
1,434,515
837,604
3,017,034
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,712,549
1,432,432
283,701
1,043,933
3,132,660
664,833
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
628,481
227,067
2,347,782
237,670
129,229
85,155,955
SW
373,603
3,095,088
1,543,026
3,370,591
22,286,818
4,467,634
2,333,922
281,400
2,246,042
5,892,781
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,641,435
263,968
1,691,744
1,178,350
316,948
140,459,779
Percent of Systems
with At Least One Detection
Total
0.161%
1.901%
0.441%
0.378%
1.646%
0.242%
1.408%
0.943%
1.854%
0.165%
0.947%
0.321%
1.400%
1.018%
3.320%
3.064%
0.759%
0.123%
0.606%
1.391%
0.353%
0.118%
0.845%
0.952%
0.908%
1.351%
4.649%
0.413%
0.000%
1.118%
1.080%
0.548%
0.456%
1.379%
0.366%
0.408%
0.285%
0.121%
0.000%
0.441%
0.332%
1.570%
3.970%
0.000%
0.964%
GW
0.211%
0.990%
0.524%
0.297%
1.374%
0.165%
1.284%
0.952%
1.887%
0.059%
0.782%
0.342%
1.509%
0.909%
0.000%
2.667%
0.710%
0.132%
0.584%
1.289%
0.373%
0.127%
0.898%
0.546%
0.921%
1.315%
4.409%
0.436%
0.000%
1.090%
1.100%
0.772%
0.529%
1.471%
0.396%
0.429%
0.617%
0.108%
0.000%
0.423%
0.357%
1.587%
5.350%
0.000%
0.914%
SW
0.000%
4.918%
0.000%
2.083%
3.301%
0.452%
5.128%
0.000%
0.000%
1.724%
6.061%
0.000%
0.000%
4.545%
5.369%
5.085%
1.471%
0.000%
1.639%
6.667%
0.000%
0.000%
0.000%
3.704%
0.000%
2.439%
13.514%
0.000%
0.000%
1.271%
0.800%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.292%
0.000%
0.588%
0.000%
0.000%
1.875%
0.000%
1.509%
Percent of Population Served
with At Least One Detection
Total
1.492%
8.244%
0.834%
5.576%
24.947%
0.005%
2.997%
1.324%
8.931%
1.194%
14.475%
0.856%
3.784%
25.234%
8.306%
4.220%
0.530%
0.030%
5.197%
8.102%
1.430%
0.027%
0.193%
1.919%
4.521%
5.332%
21.630%
27.250%
0.000%
7.137%
3.537%
0.260%
0.017%
0.143%
0.155%
0.724%
0.063%
2.760%
0.000%
0.153%
0.967%
9.779%
2.726%
0.000%
8.438%
GW
3.889%
1.576%
2.248%
1.569%
10.261%
0.015%
1.444%
2.217%
10.246%
0.016%
10.859%
1.118%
11.561%
13.988%
0.000%
12.827%
2.003%
0.073%
17.349%
11.062%
2.543%
0.057%
0.778%
1.543%
9.641%
5.661%
19.964%
32.320%
0.000%
7.479%
4.669%
1.221%
0.088%
0.753%
0.708%
0.994%
0.247%
0.053%
0.000%
0.284%
2.090%
16.825%
4.193%
0.000%
7.828%
SW
0.000%
10.664%
0.000%
8.901%
33.853%
0.004%
3.256%
0.000%
0.000%
1.513%
19.155%
0.000%
0.000%
37.700%
9.044%
2.008%
0.153%
0.000%
0.557%
0.968%
0.000%
0.000%
0.000%
2.236%
0.000%
5.093%
22.527%
0.000%
0.000%
7.045%
3.038%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.352%
0.000%
0.136%
0.000%
0.000%
2.430%
0.000%
8.808%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A26c. cis-l,2-Dichloroethylene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 70 ug/L
Total
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
5
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
3
sw
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
Percent of Systems
with At Least One Detection
> 70 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.027%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.279%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.020%
0.000%
0.000%
0.000%
0.056%
0.000%
0.000%
0.010%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.167%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.022%
0.000%
0.000%
0.000%
0.057%
0.000%
0.000%
0.007%
sw
0.000%
0.000%
0.000%
0.000%
0.194%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.847%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.047%
Population Served by Systems
with At Least One Detection
> 70 ug/L
Total
0
0
0
0
105,332
0
0
0
0
0
0
0
0
0
0
32,359
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
119
0
0
0
28,943
0
0
166,753
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
8,935
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
119
0
0
0
28,943
0
0
37,997
SW
0
0
0
0
105,332
0
0
0
0
0
0
0
0
0
0
23,424
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
128,756
Percent of Population Served
with At Least One Detection
> 70 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.294%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.378%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.716%
0.000%
0.000%
0.074%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.511%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
1.233%
0.000%
0.000%
0.045%
sw
0.000%
0.000%
0.000%
0.000%
0.473%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.344%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.092%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A26d. cis-l,2-Dichloroethylene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 35 ug/L
Total
0
0
0
0
2
0
2
0
0
0
0
0
0
0
0
2
0
0
2
0
0
0
2
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
13
GW
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
1
0
0
2
0
0
0
2
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
10
sw
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3
Percent of Systems
with At Least One Detection
> 35 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.055%
0.000%
0.166%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.279%
0.000%
0.000%
0.067%
0.000%
0.000%
0.000%
0.084%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.020%
0.000%
0.000%
0.000%
0.056%
0.000%
0.000%
0.026%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.171%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.167%
0.000%
0.000%
0.069%
0.000%
0.000%
0.000%
0.090%
0.000%
0.000%
0.000%
0.073%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.022%
0.000%
0.000%
0.000%
0.057%
0.000%
0.000%
0.022%
sw
0.000%
0.000%
0.000%
0.000%
0.388%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.847%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.071%
Population Served by Systems
with At Least One Detection
> 35 ug/L
Total
0
0
0
0
305,332
0
280
0
0
0
0
0
0
0
0
32,359
0
0
177,923
0
0
0
2,131
0
0
0
40
0
0
0
0
0
0
0
0
0
0
119
0
0
0
28,943
0
0
547,127
GW
0
0
0
0
0
0
280
0
0
0
0
0
0
0
0
8,935
0
0
177,923
0
0
0
2,131
0
0
0
40
0
0
0
0
0
0
0
0
0
0
119
0
0
0
28,943
0
0
218,371
SW
0
0
0
0
305,332
0
0
0
0
0
0
0
0
0
0
23,424
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
328,756
Percent of Population Served
with At Least One Detection
> 35 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.853%
0.000%
0.010%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.378%
0.000%
0.000%
2.486%
0.000%
0.000%
0.000%
0.030%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.716%
0.000%
0.000%
0.243%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.511%
0.000%
0.000%
8.996%
0.000%
0.000%
0.000%
0.123%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
1.233%
0.000%
0.000%
0.256%
sw
0.000%
0.000%
0.000%
0.000%
1.370%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.344%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.234%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A27. trans- 1,2-Dichloroethylene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 100 ug/L
> 50 ug/L
> 100 ug/L
> 50 ug/L
> 100 ug/L
> 50 ug/L
Total # Systems
Reporting
46,078
46,078
4,241
4,241
50,319
50,319
# Systems Exceeding
Threshold of Interest
0
0
0
0
0
0
% Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Total Pop. Served by
Systems Reporting
85,155,343
85,155,343
140,455,794
140,455,794
225,611,137
225,611,137
Total Pop. Served by
Systems Exceeding
Threshold of Interest
0
0
0
0
0
0
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A27a. trans- 1,2-Dichloroethylene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,108
820
2,393
11,685
85,900
2,866
6,935
1,047
4,153
7,174
1,763
3,766
6,988
4,621
3,309
16,249
6,772
3,689
10,751
8,581
7,544
4,486
19,066
552
6,838
9,586
20,358
6,575
3,207
7,062
8,853
5,635
2,324
1,959
4,345
889
2,946
34,144
8,991
4,892
4,345
11,292
1,140
1,659
371,258
GW
1,970
596
1,926
9,519
45,408
2,127
6,044
1,017
4,085
6,347
1,638
3,305
6,428
4,311
1,126
12,259
5,511
3,374
9,741
7,332
6,695
3,948
17,486
417
6,262
9,108
18,570
6,100
2,575
5,397
7,691
4,200
1,682
1,591
3,805
855
1,166
27,040
7,560
4,024
3,954
11,167
444
1,156
286,957
SW
1,138
224
467
2,166
40,492
739
891
30
68
827
125
461
560
310
2,183
3,990
1,261
315
1,010
1,249
849
538
1,580
135
576
478
1,788
475
632
1,665
1,162
1,435
642
368
540
34
1,780
7,104
1,431
868
391
125
696
503
84,301
Percent of Samples
with Detections
Total
0.032%
0.000%
0.000%
0.051%
0.290%
0.035%
0.043%
0.000%
0.144%
0.000%
0.000%
0.053%
0.057%
0.043%
0.151%
0.105%
0.015%
0.027%
0.205%
0.711%
0.000%
0.000%
0.005%
0.000%
0.132%
0.261%
0.044%
0.000%
0.000%
0.127%
0.045%
0.000%
0.086%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
0.041%
0.023%
0.425%
1.316%
0.000%
0.137%
GW
0.051%
0.000%
0.000%
0.032%
0.044%
0.047%
0.050%
0.000%
0.147%
0.000%
0.000%
0.061%
0.062%
0.046%
0.000%
0.090%
0.018%
0.030%
0.226%
0.832%
0.000%
0.000%
0.000%
0.000%
0.144%
0.274%
0.048%
0.000%
0.000%
0.074%
0.052%
0.000%
0.119%
0.000%
0.000%
0.000%
0.000%
0.004%
0.000%
0.050%
0.025%
0.430%
2.477%
0.000%
0.089%
SW
0.000%
0.000%
0.000%
0.139%
0.566%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.229%
0.150%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.063%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.300%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.575%
0.000%
0.300%
Minimum Detect
Concentration (u.g/L)
Total
1.04
0.5
0.51
0.5
0.51
0.13
0.6
0.51
0.5
0.5
0.52
0.5
0.5
0.4
0.1
6.2
0.27
0.26
0.19
0.5
0.5
0.8
1.1
1.4
0.98
0.02
0.18
0.02
GW
1.04
2.2
0.51
0.5
0.51
0.13
0.6
0.51
0.5
0.6
0.5
0.5
0.4
0.1
0.27
0.26
0.19
0.5
0.5
0.8
1.1
1.4
0.98
0.02
0.18
0.02
SW
0.5
0.6
0.5
0.52
6.2
0.5
0.2
0.2
Median Detect
Concentration (u.g/L)
Total
1.04
1.35
1.2
0.5
0.69
0.38
0.8
1.5
1.05
0.5
0.82
0.5
0.5
0.6
0.3
6.2
0.63
1.1
0.5
0.5
0.59
3.15
1.1
2.45
0.98
0.305
0.5
1
GW
1.04
2.7
0.79
0.5
0.69
0.38
0.8
1.5
1.05
0.9
0.5
0.5
0.6
0.3
0.63
1.1
0.5
0.5
0.59
3.15
1.1
2.45
0.98
0.305
0.5
0.6
SW
0.5
1.2
0.5
0.735
6.2
0.6
0.5
1.2
90th Percentile Detect
Concentration (u.g/L)
Total
1.04
3.2
6.9
0.5
0.8
1.6
1
8.6
1.6
1
1.4
0.5
0.5
1.3
1
6.2
0.68
4.7
1
11.2
1.7
5.5
1.1
3.5
0.98
0.7
0.5
6.1
GW
1.04
3.2
1.1
0.5
0.8
1.6
1
8.6
1.6
1.4
0.5
0.5
1.3
1
0.68
4.7
1
11.2
1.7
5.5
1.1
3.5
0.98
0.7
0.5
1.5
SW
0.5
7
1
1
6.2
1.3
1
6.9
Maximum Detect
Concentration (u.g/L)
Total
1.04
3.2
17
0.5
0.8
1.6
1
8.6
1.6
1
1.6
0.5
0.5
1.5
2
6.2
0.68
24
1
11.2
1.7
5.5
1.1
3.5
0.98
2.2
1
24
GW
1.04
3.2
1.9
0.5
0.8
1.6
1
8.6
1.6
1.6
0.5
0.5
1.5
2
0.68
24
1
11.2
1.7
5.5
1.1
3.5
0.98
2.2
0.5
24
SW
0.5
17
1
1
6.2
1.3
1
17
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A27b. trans-l,2-Dichloroethylene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
263
454
1,059
3,653
826
1,207
318
1,510
1,822
1,056
935
1,429
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
210
771
1,258
1,398
727
338
1,518
1,944
730
1,097
145
819
245
351
4,951
500
1,588
603
1,784
403
304
50,319
GW
474
202
382
1,011
3,138
605
1,168
315
1,484
1,706
1,023
878
1,325
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
183
760
1,217
1,361
688
317
1,283
1,819
518
945
136
757
233
162
4,609
454
1,418
560
1,764
243
256
46,078
SW
146
61
72
48
515
221
39
3
26
116
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
235
125
212
152
9
62
12
189
342
46
170
43
20
160
48
4,241
Total Population Served by Systems
Reporting
Total
606,193
4,218,278
2,453,348
6,166,873
35,803,379
4,997,841
2,723,376
698,987
17,497,764
7,485,298
2,543,141
1,093,666
9,217,431
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,748,495
1,698,980
973,592
4,888,900
10,227,597
3,123,687
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,269,466
491,035
4,039,526
1,416,020
446,177
225,611,137
GW
232,590
1,123,190
910,322
2,796,282
13,516,561
530,207
389,454
417,587
15,251,722
1,592,517
1,434,515
837,604
3,017,034
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,712,549
1,432,432
283,701
1,042,283
3,132,660
664,833
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
628,031
227,067
2,347,782
237,670
129,229
85,155,343
SW
373,603
3,095,088
1,543,026
3,370,591
22,286,818
4,467,634
2,333,922
281,400
2,246,042
5,892,781
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,846,617
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,641,435
263,968
1,691,744
1,178,350
316,948
140,455,794
Percent of Systems
with At Least One Detection
Total
0.161%
0.000%
0.000%
0.189%
0.192%
0.121%
0.166%
0.000%
0.397%
0.000%
0.000%
0.107%
0.140%
0.136%
2.075%
0.418%
0.095%
0.123%
0.101%
0.442%
0.000%
0.000%
0.042%
0.000%
0.130%
0.397%
0.429%
0.000%
0.000%
0.461%
0.206%
0.000%
0.182%
0.000%
0.000%
0.000%
0.000%
0.020%
0.000%
0.126%
0.166%
0.392%
3.474%
0.000%
0.189%
GW
0.211%
0.000%
0.000%
0.099%
0.159%
0.165%
0.171%
0.000%
0.404%
0.000%
0.000%
0.114%
0.151%
0.140%
0.000%
0.333%
0.101%
0.132%
0.103%
0.451%
0.000%
0.000%
0.000%
0.000%
0.132%
0.411%
0.441%
0.000%
0.000%
0.312%
0.220%
0.000%
0.212%
0.000%
0.000%
0.000%
0.000%
0.022%
0.000%
0.141%
0.179%
0.397%
4.527%
0.000%
0.171%
SW
0.000%
0.000%
0.000%
2.083%
0.388%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.356%
0.847%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.719%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.277%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.875%
0.000%
0.377%
Percent of Population Served
with At Least One Detection
Total
0.027%
0.000%
0.000%
5.569%
1.693%
0.005%
0.020%
0.000%
2.243%
0.000%
0.000%
0.960%
2.135%
1.598%
2.420%
0.380%
0.007%
0.030%
2.574%
3.645%
0.000%
0.000%
6.167%
0.000%
1.441%
0.044%
1.447%
0.000%
0.000%
5.638%
0.098%
0.000%
1.038%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.018%
1.766%
2.193%
0.000%
1.372%
GW
0.071%
0.000%
0.000%
1.553%
2.225%
0.047%
0.138%
0.000%
2.573%
0.000%
0.000%
1.254%
6.524%
3.039%
0.000%
0.522%
0.035%
0.073%
9.314%
5.158%
0.000%
0.000%
0.000%
0.000%
3.073%
0.105%
4.133%
0.000%
0.000%
0.421%
0.320%
0.000%
5.312%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.023%
0.040%
3.039%
1.018%
0.000%
1.908%
SW
0.000%
0.000%
0.000%
8.901%
1.370%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.635%
0.344%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
8.196%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
7.052%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.430%
0.000%
1.048%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table Kile. trans-l,2-Dichloroethylene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Table Kile. trans-l,2-Dichloroethylene — Summary of Stage 1 (Peak) Analyses of Any Detections > 100 u.g/L (Single detections > 100 u.g/L are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 100 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 100 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 100 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 100 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A27d.trans-l,2-Dichloroethylene —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Table A27d. trans- 1,2-Dichloroethylene — Summary of Stage 1 (Peak) Analyses of Any Detections > 50 u.g/L (Single detections > 50 u.g/L are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 50 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 50 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 50 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 50 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A28. Dichloromethane (Methylene chloride) -Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of 1 nterest
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
Total # Systems
Reporting
45,918
45,918
45,918
45,918
4,251
4,251
4,251
4,251
50,169
50,169
50,169
50,169
# Systems Exceeding
Threshold of Interest
125
319
783
1,319
22
79
193
313
147
398
976
1,632
% Systems Exceeding
Threshold of Interest
0.272%
0.695%
1.705%
2.873%
0.518%
1.858%
4.540%
7.363%
0.293%
0.793%
1.945%
3.253%
Total Pop. Served by
Systems Reporting
86,307,048
86,307,048
86,307,048
86,307,048
140,537,012
140,537,012
140,537,012
140,537,012
226,844,060
226,844,060
226,844,060
226,844,060
Total Pop. Served by
Systems Exceeding
Threshold of Interest
426,870
1,996,422
4,262,402
6,991,178
2,516,579
6,112,617
11,712,322
25,538,096
2,943,449
8,109,039
15,974,724
32,529,274
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.495%
2.313%
4.939%
8.100%
1.791%
4.349%
8.334%
18.172%
1.298%
3.575%
7.042%
14.340%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A28a. Dichloromethane (Methylene chloride) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,107
868
2,394
11,741
85,326
2,893
6,826
1,050
4,185
7,171
1,789
1,781
3,762
6,568
4,623
3,318
16,249
6,770
3,698
10,618
8,588
7,528
4,673
19,070
534
6,837
9,588
20,298
6,574
3,166
7,081
8,783
5,637
2,324
1,959
4,344
889
2,943
34,143
8,986
4,892
4,345
11,288
1,140
1,662
372,009
GW
1,969
621
1,926
9,575
44,955
2,135
5,936
1,020
4,118
6,347
1,686
1,656
3,301
5,995
4,313
1,128
12,259
5,508
3,383
9,608
7,339
6,685
3,981
17,489
405
6,261
9,108
18,518
6,098
2,546
5,420
7,632
4,201
1,682
1,591
3,805
855
1,164
27,032
7,560
4,023
3,952
11,164
443
1,159
287,552
SW
1,138
247
468
2,166
40,371
758
890
30
67
824
103
125
461
573
310
2,190
3,990
1,262
315
1,010
1,249
843
692
1,581
129
576
480
1,780
476
620
1,661
1,151
1,436
642
368
539
34
1,779
7,111
1,426
869
393
124
697
503
84,457
Percent of Samples
with Detections
Total
4.313%
7.373%
1.044%
0.230%
0.484%
3.111%
0.278%
0.952%
2.843%
0.558%
0.000%
1.179%
0.425%
1.629%
2.271%
2.502%
0.431%
1.285%
0.730%
0.367%
0.780%
0.956%
5.307%
0.346%
0.749%
0.044%
0.688%
0.985%
1.567%
0.695%
0.621%
1.583%
1.064%
0.129%
0.613%
0.322%
0.225%
0.917%
0.674%
0.234%
0.164%
0.621%
2.702%
1.491%
1.504%
0.882%
GW
2.692%
5.153%
1.194%
0.178%
0.543%
3.138%
0.303%
0.882%
2.890%
0.504%
0.000%
1.268%
0.485%
1.635%
2.365%
1.950%
0.424%
1.416%
0.709%
0.364%
0.722%
0.927%
3.240%
0.360%
0.741%
0.048%
0.681%
0.999%
1.427%
0.628%
0.720%
1.769%
0.738%
0.059%
0.503%
0.289%
0.234%
0.945%
0.633%
0.132%
0.199%
0.658%
2.705%
2.709%
1.812%
0.874%
SW
7.118%
12.955%
0.427%
0.462%
0.419%
3.034%
0.112%
3.333%
0.000%
0.971%
0.000%
0.000%
0.000%
1.571%
0.968%
2.785%
0.451%
0.713%
0.952%
0.396%
1.121%
1.186%
17.197%
0.190%
0.775%
0.000%
0.833%
0.843%
3.361%
0.968%
0.301%
0.348%
2.019%
0.312%
1.087%
0.557%
0.000%
0.899%
0.830%
0.771%
0.000%
0.254%
2.419%
0.717%
0.795%
0.909%
Minimum Detect
Concentration (u.g/L)
Total
0.0041
0.5
0.15
0.5
0.2
0.04
0.51
0.52
0.15
0.52
0.65
0.5
0.5
0.01
0.005
0.4
0.5
0.5
0.5
0.5
0.5
0.24
0.5
0.52
0.39
0.5
0.09
0.15
0.5
0.5
0.5
0.36
0.6
0.62
0.51
0.5
0.51
0.5
0.3
0.5
0.5
0.01
0.34
0.2
0.0041
GW
0.0041
0.51
0.15
0.5
0.2
0.04
0.51
0.52
0.15
0.52
0.65
0.5
0.5
0.01
0.5
0.4
0.5
0.5
0.5
0.5
0.51
0.24
0.5
0.52
0.39
0.5
0.17
0.15
0.55
0.5
0.5
0.4
0.6
0.62
0.51
0.5
1
0.5
0.3
0.5
0.5
0.01
0.34
0.6
0.0041
SW
0.22
0.5
0.25
0.5
0.5
0.46
1.6
1.68
0.52
0.84
0.5
0.005
0.5
0.5
0.6
0.6
0.5
0.5
0.51
0.5
0.65
0.54
0.09
0.18
0.5
0.5
0.5
0.36
0.6
1.4
0.51
0.51
0.5
0.5
0.6
0.79
0.5
0.2
0.005
Median Detect
Concentration (u.g/L)
Total
0.955
1.485
0.74
0.8
0.9
0.585
1.4
0.755
0.89
1.25
1.4
1.2
0.8
1.1
0.9
1
1
1.3
0.9
1.1
1
1.7
1.3
0.65
0.88
1.55
0.7
1.2
0.75
0.7
0.8
0.8
0.6
2.25
0.765
0.515
1.3
0.8
0.7
1.55
0.6
0.6
0.5
3
0.9
GW
0.93
1.78
0.74
0.8
0.87
0.41
1.3
0.73
0.89
1.55
1.4
1.2
0.79
1.15
1
0.95
1
1.7
0.9
1.2
1
1.7
1.3
0.65
0.88
1.55
0.7
1.2
0.75
0.7
0.8
0.77
0.6
2.4
0.67
0.515
1.9
0.9
1.05
1.55
0.65
0.6
0.5
3
0.9
SW
0.97
1.295
1.175
0.65
1
1
1.6
1.68
0.8
0.92
0.63
0.8
1.35
0.8
1.2
0.95
1.1
0.9
1.67
1.7
0.65
1.165
0.7
1.3
0.75
0.6
0.75
0.9
2
1.9
0.86
0.9
0.7
0.5
0.6
1.37
1
0.71
1
90th Percentile Detect
Concentration (u.g/L)
Total
3.5
3.5
1.83
2.15
2.6
1.55
8.3
2.18
4.34
3.4
4.2
9.96
2.11
3.7
4
3.25
13.2
5.2
2.5
3.4
4.25
5.09
8.05
0.81
1.2
6.5
4.345
1.8
3.1
1.7
3.18
3.295
3.4
3.9
4.7
0.53
3.5
2.85
5.6
8.9
1.3
2.1
3.9
9.8
3.4
GW
3.1
8.64
1.8
3.2
2.4
1.2
8.3
2.68
4.34
3.4
4.2
9.96
2.2
3.7
6
3.1
13.2
5.2
2.3
3.2
3.8
5.8
8.05
0.81
1.2
6.5
4.09
1.8
4.4
2
3.18
2.4
0.6
7.4
4.7
0.53
3.5
3
8.95
8.9
1.3
2.1
0.82
8.7
3.62
SW
3.8
3.1
2.1
0.95
2.7
2.9
1.6
1.68
2.4
1.4
0.95
3
3.8
13.4
1.3
2.5
7
15.15
4.2
2.5
0.65
2.8
12.8
1.92
3.1
1.1
2.39
3.3
3.4
2.6
1.15
2.8
2.1
0.9
0.6
1.45
21.5
9.8
3.2
Maximum Detect
Concentration (u.g/L)
Total
88
9.94
3
16
28
17
12
2.68
29.6
34
47.9
19
33.8
75.3
9.6
9.6
115
11
55.3
31
25.8
20.8
182
0.81
1.2
40
315.9
42
7.5
11.4
51.54
4.9
3.4
7.4
18.4
0.53
5.6
30
11.8
8.9
16.4
16
21.5
12.4
315.9
GW
88
9.94
3
16
16.5
7.4
12
2.68
29.6
34
47.9
19
33.8
75.3
9.6
9.6
115
11
55.3
7
16
20.8
182
0.81
1.2
40
315.9
42
7.5
11.4
51.54
4.9
0.6
7.4
18.4
0.53
3.5
30
11.8
8.9
16.4
16
3.9
12.4
315.9
SW
8.1
5.2
2.1
1
28
17
1.6
1.68
2.4
1.4
0.95
8
3.8
13.4
1.3
2.5
31
25.8
18
2.5
0.65
2.8
27.1
2.6
3.1
1.1
2.39
3.6
3.4
2.6
1.15
5.6
12
0.9
0.6
1.45
21.5
9.8
31
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A28b. Dichloromethane (Methylene chloride) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
264
454
1,058
3,659
826
1,200
319
1,512
1,822
106
1,055
935
1,181
1,474
241
718
1,054
810
2,964
1,582
1,417
848
2,367
209
771
1,258
1,398
727
338
1,518
1,944
730
1,097
145
819
245
351
4,951
500
1,588
603
1,784
403
304
50,169
GW
474
202
382
1,010
3,143
605
1,161
316
1,486
1,706
94
1,022
878
1,081
1,430
92
600
986
757
2,903
1,552
1,340
788
2,228
182
760
1,217
1,361
688
317
1,283
1,819
518
945
136
757
233
162
4,609
454
1,418
560
1,764
243
256
45,918
SW
146
62
72
48
516
221
39
3
26
116
12
33
57
100
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
235
125
212
152
9
62
12
189
342
46
170
43
20
160
48
4,251
Total Population Served by Systems
Reporting
Total
606,193
4,224,479
2,453,348
6,162,837
35,830,016
4,997,841
2,722,518
699,085
17,499,838
7,485,298
1,293,745
2,543,092
1,093,666
9,131,338
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,151,842
4,260,523
3,004,094
757,949
6,998,123
562,357
1,462,181
948,788
7,748,495
1,698,980
973,592
4,888,878
10,227,597
3,123,687
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,270,628
491,035
4,039,526
1,416,020
446,177
226,844,060
GW
232,590
1,123,190
910,322
2,792,246
13,517,625
530,207
388,596
417,685
15,253,796
1,592,517
1,239,117
1,434,466
837,604
2,935,560
2,571,485
375,363
1,749,901
1,025,295
292,773
1,971,986
3,010,848
1,689,633
365,280
1,732,957
257,132
685,701
398,989
2,712,549
1,432,432
283,701
1,042,826
3,132,660
664,833
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
629,193
227,067
2,347,782
237,670
129,229
86,307,048
SW
373,603
3,101,289
1,543,026
3,370,591
22,312,391
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,195,778
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,846,052
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,641,435
263,968
1,691,744
1,178,350
316,948
140,537,012
Percent of Systems
with At Least One Detection
Total
13.226%
12.500%
3.524%
1.985%
4.127%
8.959%
0.833%
3.135%
5.291%
1.262%
0.000%
1.706%
1.283%
6.520%
4.817%
18.672%
6.267%
3.890%
2.099%
1.181%
2.149%
4.305%
12.028%
2.028%
1.914%
0.389%
3.021%
8.512%
9.216%
4.734%
1.713%
4.990%
3.151%
0.182%
5.517%
1.343%
0.816%
3.419%
3.434%
2.200%
0.504%
1.824%
10.426%
4.218%
6.908%
3.903%
GW
9.072%
9.406%
3.665%
1.485%
3.404%
9.587%
0.775%
2.848%
5.384%
1.231%
0.000%
1.761%
1.367%
6.290%
4.755%
11.957%
5.667%
3.550%
1.849%
1.068%
1.869%
3.806%
8.249%
2.020%
1.648%
0.395%
2.876%
8.376%
8.430%
4.101%
1.637%
5.168%
3.089%
0.106%
5.147%
1.189%
0.858%
3.086%
2.972%
1.762%
0.564%
1.786%
10.431%
4.938%
6.641%
3.513%
SW
26.712%
22.581%
2.778%
12.500%
8.527%
7.240%
2.564%
33.333%
0.000%
1.724%
0.000%
0.000%
0.000%
9.000%
6.818%
22.819%
9.322%
8.824%
5.660%
6.557%
16.667%
12.987%
61.667%
2.158%
3.704%
0.000%
7.317%
13.514%
23.077%
14.286%
2.128%
2.400%
3.302%
0.658%
11.111%
3.226%
0.000%
3.704%
9.649%
6.522%
0.000%
2.326%
10.000%
3.125%
8.333%
8.116%
Percent of Population Served
with At Least One Detection
Total
45.287%
40.094%
2.048%
17.822%
29.817%
7.671%
0.769%
22.651%
8.673%
0.731%
0.000%
0.758%
8.502%
4.432%
4.700%
22.088%
4.425%
42.221%
5.632%
50.989%
8.071%
7.238%
54.015%
7.255%
3.169%
0.138%
26.043%
20.368%
17.492%
9.514%
0.377%
18.193%
3.386%
0.041%
8.369%
0.390%
0.819%
5.218%
24.661%
27.126%
0.084%
0.528%
14.341%
2.821%
8.805%
16.542%
GW
9.269%
14.180%
2.309%
3.918%
17.555%
10.453%
3.681%
4.393%
9.950%
2.124%
0.000%
1.343%
11.101%
9.218%
3.885%
13.129%
7.880%
27.873%
0.878%
2.586%
6.694%
6.272%
31.745%
3.321%
6.575%
0.294%
10.720%
10.218%
10.584%
11.311%
1.341%
3.974%
9.675%
0.024%
4.728%
0.724%
1.124%
5.765%
18.561%
8.964%
0.701%
1.033%
23.153%
2.860%
4.478%
10.521%
SW
67.711%
49.479%
1.894%
29.341%
37.245%
7.341%
0.284%
49.751%
0.000%
0.354%
0.000%
0.000%
0.000%
2.164%
5.604%
22.884%
3.537%
45.901%
8.827%
69.416%
11.387%
8.479%
74.731%
8.549%
0.299%
0.000%
37.163%
25.834%
54.614%
8.775%
0.116%
24.471%
1.686%
0.045%
9.225%
0.297%
0.000%
5.029%
28.247%
63.243%
0.000%
0.095%
2.113%
2.813%
10.570%
20.240%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A28c. Dichloromethane (Methylene chloride) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 5 ug/L
Total
3
4
0
1
12
3
3
0
5
2
0
2
3
3
4
3
1
3
3
2
5
5
19
5
0
0
8
4
5
1
1
5
0
0
1
1
0
1
10
3
1
1
7
1
6
147
GW
2
3
0
1
10
2
3
0
5
2
0
2
3
3
4
2
1
2
3
2
3
4
12
5
0
0
8
3
5
1
1
5
0
0
1
1
0
0
9
3
1
1
7
0
5
125
SW
1
1
0
0
2
1
0
0
0
0
0
0
0
0
0
1
0
1
0
0
2
1
7
0
0
0
0
1
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
1
1
22
Percent of Systems
with At Least One Detection
> 5 ug/L
Total
0.484%
1.515%
0.000%
0.095%
0.328%
0.363%
0.250%
0.000%
0.331%
0.110%
0.000%
0.190%
0.321%
0.254%
0.271%
1.245%
0.139%
0.285%
0.370%
0.067%
0.316%
0.353%
2.241%
0.211%
0.000%
0.000%
0.636%
0.286%
0.688%
0.296%
0.066%
0.257%
0.000%
0.000%
0.690%
0.122%
0.000%
0.285%
0.202%
0.600%
0.063%
0.166%
0.392%
0.248%
1.974%
0.293%
GW
0.422%
1.485%
0.000%
0.099%
0.318%
0.331%
0.258%
0.000%
0.336%
0.117%
0.000%
0.196%
0.342%
0.278%
0.280%
2.174%
0.167%
0.203%
0.396%
0.069%
0.193%
0.299%
1.523%
0.224%
0.000%
0.000%
0.657%
0.220%
0.727%
0.315%
0.078%
0.275%
0.000%
0.000%
0.735%
0.132%
0.000%
0.000%
0.195%
0.661%
0.071%
0.179%
0.397%
0.000%
1.953%
0.272%
SW
0.685%
1.613%
0.000%
0.000%
0.388%
0.452%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
0.000%
1.471%
0.000%
0.000%
6.667%
1.299%
11.667%
0.000%
0.000%
0.000%
0.000%
2.703%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.529%
0.292%
0.000%
0.000%
0.000%
0.000%
0.625%
2.083%
0.518%
Population Served by Systems
with At Least One Detection
> 5 ug/L
Total
3,317
35,927
0
32,291
351,170
2,137
550
0
70,510
1,585
0
3,129
2,240
512
650
17,990
8,019
1,710,307
675
82
49,713
17,228
15,995
518
0
0
971
312,635
493
100
1,685
9,117
0
0
3,811
1,628
0
18,862
206,395
40,879
125
1,300
14,543
4,475
1,885
2,943,449
GW
225
14,873
0
32,291
155,838
337
550
0
70,510
1,585
0
3,129
2,240
512
650
1,542
8,019
307
675
82
13,145
9,695
12,077
518
0
0
971
759
493
100
1,685
9,117
0
0
3,811
1,628
0
0
21,454
40,879
125
1,300
14,543
0
1,205
426,870
SW
3,092
21,054
0
0
195,332
1,800
0
0
0
0
0
0
0
0
0
16,448
0
1,710,000
0
0
36,568
7,533
3,918
0
0
0
0
311,876
0
0
0
0
0
0
0
0
0
18,862
184,941
0
0
0
0
4,475
680
2,516,579
Percent of Population Served
with At Least One Detection
> 5 ug/L
Total
0.547%
0.850%
0.000%
0.524%
0.980%
0.043%
0.020%
0.000%
0.403%
0.021%
0.000%
0.123%
0.205%
0.006%
0.013%
0.391%
0.094%
34.047%
0.093%
0.001%
1.167%
0.573%
2.110%
0.007%
0.000%
0.000%
0.102%
4.035%
0.029%
0.010%
0.034%
0.089%
0.000%
0.000%
0.417%
0.048%
0.000%
0.332%
0.822%
1.601%
0.002%
0.265%
0.360%
0.316%
0.422%
1.298%
GW
0.097%
1.324%
0.000%
1.156%
1.153%
0.064%
0.142%
0.000%
0.462%
0.100%
0.000%
0.218%
0.267%
0.017%
0.025%
0.411%
0.458%
0.030%
0.231%
0.004%
0.437%
0.574%
3.306%
0.030%
0.000%
0.000%
0.243%
0.028%
0.034%
0.035%
0.162%
0.291%
0.000%
0.000%
2.191%
0.222%
0.000%
0.000%
0.231%
2.406%
0.020%
0.573%
0.619%
0.000%
0.932%
0.495%
SW
0.828%
0.679%
0.000%
0.000%
0.875%
0.040%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.389%
0.000%
42.770%
0.000%
0.000%
2.926%
0.573%
0.998%
0.000%
0.000%
0.000%
0.000%
6.193%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.447%
1.169%
0.000%
0.000%
0.000%
0.000%
0.380%
0.215%
1.791%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A28d. Dichloromethane (Methylene chloride) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2.5 ug/L
Total
18
11
1
2
25
6
4
1
22
3
0
4
5
7
17
12
8
11
6
4
12
10
55
13
0
0
13
12
6
4
3
13
4
1
5
2
0
5
27
4
3
2
22
2
13
398
GW
6
6
1
2
18
2
4
1
22
3
0
4
5
7
17
4
6
9
6
3
10
8
37
12
0
0
12
11
5
3
3
13
2
0
4
2
0
3
24
4
3
2
22
1
12
319
SW
12
5
0
0
7
4
0
0
0
0
0
0
0
0
0
8
2
2
0
1
2
2
18
1
0
0
1
1
1
1
0
0
2
1
1
0
0
2
3
0
0
0
0
1
1
79
Percent of Systems
with At Least One Detection
> 2.5 ug/L
Total
2.903%
4.167%
0.220%
0.189%
0.683%
0.726%
0.333%
0.313%
1.455%
0.165%
0.000%
0.379%
0.535%
0.593%
1.153%
4.979%
1.114%
1.044%
0.741%
0.135%
0.759%
0.706%
6.486%
0.549%
0.000%
0.000%
1.033%
0.858%
0.825%
1.183%
0.198%
0.669%
0.548%
0.091%
3.448%
0.244%
0.000%
1.425%
0.545%
0.800%
0.189%
0.332%
1.233%
0.496%
4.276%
0.793%
GW
1.266%
2.970%
0.262%
0.198%
0.573%
0.331%
0.345%
0.316%
1.480%
0.176%
0.000%
0.391%
0.569%
0.648%
1.189%
4.348%
1.000%
0.913%
0.793%
0.103%
0.644%
0.597%
4.695%
0.539%
0.000%
0.000%
0.986%
0.808%
0.727%
0.946%
0.234%
0.715%
0.386%
0.000%
2.941%
0.264%
0.000%
1.852%
0.521%
0.881%
0.212%
0.357%
1.247%
0.412%
4.688%
0.695%
SW
8.219%
8.065%
0.000%
0.000%
1.357%
1.810%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.369%
1.695%
2.941%
0.000%
1.639%
6.667%
2.597%
30.000%
0.719%
0.000%
0.000%
2.439%
2.703%
2.564%
4.762%
0.000%
0.000%
0.943%
0.658%
11.111%
0.000%
0.000%
1.058%
0.877%
0.000%
0.000%
0.000%
0.000%
0.625%
2.083%
1.858%
Population Served by Systems
with At Least One Detection
> 2.5 ug/L
Total
235,589
803,879
3,800
32,321
1,642,625
38,493
750
105
802,550
2,835
0
3,349
37,960
7,912
71,958
261,300
29,876
1,711,368
1,146
221,976
145,163
30,132
151,509
11,178
0
0
54,124
362,012
1,043
56,797
1,930
10,192
23,881
1,075
72,563
2,353
0
101,448
967,793
146,879
1,840
1,384
46,597
4,524
4,830
8,109,039
GW
1,908
36,647
3,800
32,321
353,377
337
750
105
802,550
2,835
0
3,349
37,960
7,912
71,958
1,792
10,045
965
1,146
32,833
108,595
11,945
20,412
7,418
0
0
20,124
50,136
493
297
1,930
10,192
610
0
4,300
2,353
0
82,521
71,607
146,879
1,840
1,384
46,597
49
4,150
1,996,422
SW
233,681
767,232
0
0
1,289,248
38,156
0
0
0
0
0
0
0
0
0
259,508
19,831
1,710,403
0
189,143
36,568
18,187
131,097
3,760
0
0
34,000
311,876
550
56,500
0
0
23,271
1,075
68,263
0
0
18,927
896,186
0
0
0
0
4,475
680
6,112,617
Percent of Population Served
with At Least One Detection
> 2.5 ug/L
Total
38.864%
19.029%
0.155%
0.524%
4.584%
0.770%
0.028%
0.015%
4.586%
0.038%
0.000%
0.132%
3.471%
0.087%
1.471%
5.677%
0.349%
34.068%
0.157%
3.104%
3.407%
1.003%
19.989%
0.160%
0.000%
0.000%
5.705%
4.672%
0.061%
5.834%
0.039%
0.100%
0.765%
0.037%
7.940%
0.070%
0.000%
1.784%
3.854%
5.753%
0.035%
0.282%
1.154%
0.319%
1.083%
3.575%
GW
0.820%
3.263%
0.417%
1.158%
2.614%
0.064%
0.193%
0.025%
5.261%
0.178%
0.000%
0.233%
4.532%
0.270%
2.798%
0.477%
0.574%
0.094%
0.391%
1.665%
3.607%
0.707%
5.588%
0.428%
0.000%
0.000%
5.044%
1.848%
0.034%
0.105%
0.185%
0.325%
0.092%
0.000%
2.473%
0.321%
0.000%
5.642%
0.770%
8.646%
0.292%
0.610%
1.985%
0.021%
3.211%
2.313%
SW
62.548%
24.739%
0.000%
0.000%
5.778%
0.854%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.139%
0.291%
42.780%
0.000%
3.652%
2.926%
1.384%
33.386%
0.071%
0.000%
0.000%
6.184%
6.193%
0.206%
8.190%
0.000%
0.000%
0.946%
0.045%
9.225%
0.000%
0.000%
0.448%
5.667%
0.000%
0.000%
0.000%
0.000%
0.380%
0.215%
4.349%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A28e. Dichloromethane (Methylene chloride) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 1 ug/L
Total
42
25
6
8
74
16
8
3
40
13
0
15
7
29
44
29
24
27
11
16
24
33
80
30
0
1
19
40
45
7
10
47
9
1
7
5
0
10
80
5
6
4
56
4
16
976
GW
20
14
5
7
50
7
7
2
40
12
0
15
7
26
44
7
17
24
9
14
21
28
50
28
0
1
17
38
39
5
9
46
5
0
6
4
0
5
69
5
6
4
54
1
15
783
SW
22
11
1
1
24
9
1
1
0
1
0
0
0
3
0
22
7
3
2
2
3
5
30
2
0
0
2
2
6
2
1
1
4
1
1
1
0
5
11
0
0
0
2
3
1
193
Percent of Systems
with At Least One Detection
> 1 ug/L
Total
6.774%
9.470%
1.322%
0.756%
2.022%
1.937%
0.667%
0.940%
2.646%
0.714%
0.000%
1.422%
0.749%
2.456%
2.985%
12.033%
3.343%
2.562%
1.358%
0.540%
1.517%
2.329%
9.434%
1.267%
0.000%
0.130%
1.510%
2.861%
6.190%
2.071%
0.659%
2.418%
1.233%
0.091%
4.828%
0.611%
0.000%
2.849%
1.616%
1.000%
0.378%
0.663%
3.139%
0.993%
5.263%
1.945%
GW
4.219%
6.931%
1.309%
0.693%
1.591%
1.157%
0.603%
0.633%
2.692%
0.703%
0.000%
1.468%
0.797%
2.405%
3.077%
7.609%
2.833%
2.434%
1.189%
0.482%
1.353%
2.090%
6.345%
1.257%
0.000%
0.132%
1.397%
2.792%
5.669%
1.577%
0.701%
2.529%
0.965%
0.000%
4.412%
0.528%
0.000%
3.086%
1.497%
1.101%
0.423%
0.714%
3.061%
0.412%
5.859%
1.705%
SW
15.068%
17.742%
1.389%
2.083%
4.651%
4.072%
2.564%
33.333%
0.000%
0.862%
0.000%
0.000%
0.000%
3.000%
0.000%
14.765%
5.932%
4.412%
3.774%
3.279%
10.000%
6.494%
50.000%
1.439%
0.000%
0.000%
4.878%
5.405%
15.385%
9.524%
0.426%
0.800%
1.887%
0.658%
11.111%
1.613%
0.000%
2.646%
3.216%
0.000%
0.000%
0.000%
10.000%
1.875%
2.083%
4.540%
Population Served by Systems
with At Least One Detection
>lug/L
Total
260,328
1,411,820
27,602
47,231
4,210,227
270,295
8,620
141,005
1,138,675
28,733
0
13,760
38,403
173,752
86,889
638,410
234,708
1,843,181
40,351
227,828
234,705
73,066
382,101
463,653
0
1,700
212,678
1,064,460
249,916
60,930
6,740
24,452
30,000
1,075
76,193
8,841
0
289,262
1,529,166
147,079
4,098
1,644
258,677
6,364
6,106
15,974,724
GW
14,440
76,732
11,555
46,731
1,271,794
1,514
2,000
1,005
1,138,675
10,531
0
13,760
38,403
103,673
86,889
43,217
67,265
28,211
2,101
35,766
129,691
30,633
104,882
28,346
0
1,700
21,105
76,330
119,003
591
5,813
23,452
4,142
0
7,930
2,553
0
84,310
246,426
147,079
4,098
1,644
222,937
49
5,426
4,262,402
SW
245,888
1,335,088
16,047
500
2,938,433
268,781
6,620
140,000
0
18,202
0
0
0
70,079
0
595,193
167,443
1,814,970
38,250
192,062
105,014
42,433
277,219
435,307
0
0
191,573
988,130
130,913
60,339
927
1,000
25,858
1,075
68,263
6,288
0
204,952
1,282,740
0
0
0
35,740
6,315
680
11,712,322
Percent of Population Served
with At Least One Detection
>lug/L
Total
42.945%
33.420%
1.125%
0.766%
11.751%
5.408%
0.317%
20.170%
6.507%
0.384%
0.000%
0.541%
3.511%
1.903%
1.776%
13.871%
2.743%
36.692%
5.540%
3.186%
5.509%
2.432%
50.412%
6.625%
0.000%
0.116%
22.416%
13.738%
14.710%
6.258%
0.138%
0.239%
0.960%
0.037%
8.337%
0.263%
0.000%
5.088%
6.089%
5.761%
0.078%
0.335%
6.404%
0.449%
1.369%
7.042%
GW
6.208%
6.832%
1.269%
1.674%
9.408%
0.286%
0.515%
0.241%
7.465%
0.661%
0.000%
0.959%
4.585%
3.532%
3.379%
11.513%
3.844%
2.752%
0.718%
1.814%
4.307%
1.813%
28.713%
1.636%
0.000%
0.248%
5.290%
2.814%
8.308%
0.208%
0.557%
0.749%
0.623%
0.000%
4.560%
0.348%
0.000%
5.765%
2.651%
8.657%
0.651%
0.724%
9.496%
0.021%
4.199%
4.939%
SW
65.815%
43.049%
1.040%
0.015%
13.170%
6.016%
0.284%
49.751%
0.000%
0.309%
0.000%
0.000%
0.000%
1.131%
0.000%
14.081%
2.460%
45.396%
8.782%
3.708%
8.403%
3.228%
70.599%
8.268%
0.000%
0.000%
34.844%
19.622%
49.114%
8.746%
0.024%
0.014%
1.052%
0.045%
9.225%
0.240%
0.000%
4.854%
8.111%
0.000%
0.000%
0.000%
2.113%
0.536%
0.215%
8.334%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A28f. Dichloromethane (Methylene chloride) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.5 ug/L
Total
79
32
9
17
145
38
10
10
51
23
0
18
9
74
64
41
40
41
13
34
32
58
101
41
4
2
36
85
48
16
19
83
18
2
8
11
1
12
149
9
7
8
108
6
20
1,632
GW
41
19
8
12
102
24
9
9
51
21
0
18
9
65
62
10
30
35
10
30
28
51
64
39
3
2
33
80
41
13
16
81
12
1
7
9
1
5
121
7
7
7
106
3
17
1,319
SW
38
13
1
5
43
14
1
1
0
2
0
0
0
9
2
31
10
6
3
4
4
7
37
2
1
0
3
5
7
3
3
2
6
1
1
2
0
7
28
2
0
1
2
3
3
313
Percent of Systems
with At Least One Detection
> 0.5 ug/L
Total
12.742%
12.121%
1.982%
1.607%
3.963%
4.600%
0.833%
3.135%
3.373%
1.262%
0.000%
1.706%
0.963%
6.266%
4.342%
17.012%
5.571%
3.890%
1.605%
1.147%
2.023%
4.093%
11.910%
1.732%
1.914%
0.259%
2.862%
6.080%
6.602%
4.734%
1.252%
4.270%
2.466%
0.182%
5.517%
1.343%
0.408%
3.419%
3.009%
1.800%
0.441%
1.327%
6.054%
1.489%
6.579%
3.253%
GW
8.650%
9.406%
2.094%
1.188%
3.245%
3.967%
0.775%
2.848%
3.432%
1.231%
0.000%
1.761%
1.025%
6.013%
4.336%
10.870%
5.000%
3.550%
1.321%
1.033%
1.804%
3.806%
8.122%
1.750%
1.648%
0.263%
2.712%
5.878%
5.959%
4.101%
1.247%
4.453%
2.317%
0.106%
5.147%
1.189%
0.429%
3.086%
2.625%
1.542%
0.494%
1.250%
6.009%
1.235%
6.641%
2.873%
SW
26.027%
20.968%
1.389%
10.417%
8.333%
6.335%
2.564%
33.333%
0.000%
1.724%
0.000%
0.000%
0.000%
9.000%
4.545%
20.805%
8.475%
8.824%
5.660%
6.557%
13.333%
9.091%
61.667%
1.439%
3.704%
0.000%
7.317%
13.514%
17.949%
14.286%
1.277%
1.600%
2.830%
0.658%
11.111%
3.226%
0.000%
3.704%
8.187%
4.348%
0.000%
2.326%
10.000%
1.875%
6.250%
7.363%
Population Served by Systems
with At Least One Detection
> 0.5 ug/L
Total
274,228
1,687,556
29,669
793,079
10,589,878
327,054
20,925
158,347
1,270,475
54,700
0
19,271
40,278
380,580
216,869
716,907
354,410
2,120,947
40,661
3,646,624
307,511
155,251
409,254
490,565
17,819
1,746
244,380
1,534,780
256,103
92,629
13,584
151,031
92,384
1,215
76,485
13,093
113
296,683
4,663,260
539,819
4,388
2,268
397,109
8,899
16,447
32,529,274
GW
21,409
159,270
13,622
104,115
2,364,657
5,969
14,305
18,347
1,270,475
33,827
0
19,271
40,278
246,518
94,576
48,581
137,060
285,785
2,211
50,978
200,239
105,975
115,807
55,258
16,906
1,746
40,057
233,775
122,453
32,090
9,457
70,781
63,357
140
8,222
5,305
113
84,310
366,008
151,779
4,388
2,018
361,369
2,584
5,787
6,991,178
SW
252,819
1,528,286
16,047
688,964
8,225,221
321,085
6,620
140,000
0
20,873
0
0
0
134,062
122,293
668,326
217,350
1,835,162
38,450
3,595,646
107,272
49,276
293,447
435,307
913
0
204,323
1,301,005
133,650
60,539
4,127
80,250
29,027
1,075
68,263
7,788
0
212,373
4,297,252
388,040
0
250
35,740
6,315
10,660
25,538,096
Percent of Population Served
with At Least One Detection
> 0.5 ug/L
Total
45.238%
39.947%
1.209%
12.869%
29.556%
6.544%
0.769%
22.651%
7.260%
0.731%
0.000%
0.758%
3.683%
4.168%
4.434%
15.577%
4.142%
42.221%
5.583%
50.989%
7.218%
5.168%
53.995%
7.010%
3.169%
0.119%
25.757%
19.807%
15.074%
9.514%
0.278%
1.477%
2.958%
0.041%
8.369%
0.390%
0.042%
5.218%
18.570%
21.143%
0.083%
0.462%
9.831%
0.628%
3.686%
14.340%
GW
9.205%
14.180%
1.496%
3.729%
17.493%
1.126%
3.681%
4.393%
8.329%
2.124%
0.000%
1.343%
4.809%
8.398%
3.678%
12.942%
7.832%
27.873%
0.755%
2.585%
6.651%
6.272%
31.704%
3.189%
6.575%
0.255%
10.040%
8.618%
8.549%
11.311%
0.907%
2.259%
9.530%
0.024%
4.728%
0.724%
0.058%
5.765%
3.937%
8.934%
0.697%
0.889%
15.392%
1.087%
4.478%
8.100%
SW
67.670%
49.279%
1.040%
20.440%
36.864%
7.187%
0.284%
49.751%
0.000%
0.354%
0.000%
0.000%
0.000%
2.164%
5.272%
15.811%
3.193%
45.901%
8.827%
69.416%
8.584%
3.749%
74.731%
8.268%
0.299%
0.000%
37.163%
25.834%
50.141%
8.775%
0.107%
1.131%
1.181%
0.045%
9.225%
0.297%
0.000%
5.029%
27.172%
45.421%
0.000%
0.095%
2.113%
0.536%
3.363%
18.172%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A29. 2,4-Dichlorophenoxyacetic acid -Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of 1 nterest
> 70 ug/L
> 40 ug/L
> 35 ug/L
> 70 ug/L
> 40 u.g/L
> 35 ug/L
> 70 ug/L
> 40 ug/L
> 35 ug/L
Total # Systems
Reporting
30,172
30,172
30,172
3,015
3,015
3,015
33,187
33,187
33,187
# Systems Exceeding
Threshold of Interest
0
1
2
1
1
1
1
2
3
% Systems Exceeding
Threshold of Interest
0.000%
0.003%
0.007%
0.033%
0.033%
0.033%
0.003%
0.006%
0.009%
Total Pop. Served by
Systems Reporting
67,200,878
67,200,878
67,200,878
120,250,305
120,250,305
120,250,305
187,451,183
187,451,183
187,451,183
Total Pop. Served by
Systems Exceeding
Threshold of Interest
0
1,810
1,845
13,933
13,933
13,933
13,933
15,743
15,778
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.003%
0.003%
0.012%
0.012%
0.012%
0.007%
0.008%
0.008%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A29a. 2,4-Dichlorophenoxyacetic acid — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
76
629
1,588
6,803
14,610
2,539
1,598
826
2,411
1,433
1,745
2,079
4,076
2,475
1,755
2,981
2,502
378
6,585
4,627
5,801
3,190
13,960
404
2,220
4,193
162
4,350
1,576
2,891
581
2,082
740
3,307
965
71
2,174
7,094
442
1,299
3,164
648
1,255
124,285
GW
42
442
1,357
5,382
8,466
1,862
1,012
788
2,344
1,355
1,615
1,799
3,478
2,309
437
2,188
1,699
317
6,292
4,495
4,982
2,908
12,727
341
2,143
3,874
144
4,103
1,161
2,172
387
1,599
498
2,896
848
12
1,343
5,906
148
1,105
3,072
340
941
101,329
SW
34
187
231
1,421
6,144
677
586
38
67
78
130
280
598
166
1,318
793
803
61
293
132
819
282
1,233
63
77
319
18
247
415
719
194
483
242
411
117
59
831
1,188
294
194
92
308
314
22,956
Percent of Samples
with Detections
Total
3.947%
0.159%
0.000%
0.412%
0.075%
0.158%
0.438%
0.121%
0.995%
0.349%
0.229%
0.048%
0.098%
0.283%
1.197%
0.235%
3.038%
0.000%
0.000%
0.303%
0.034%
0.063%
1.125%
0.000%
0.000%
0.024%
0.000%
0.138%
0.190%
0.173%
0.688%
0.000%
0.000%
0.393%
0.207%
0.000%
0.000%
0.000%
0.000%
0.231%
0.158%
2.006%
0.000%
0.349%
GW
7.143%
0.226%
0.000%
0.334%
0.012%
0.161%
0.000%
0.000%
0.981%
0.295%
0.186%
0.056%
0.086%
0.043%
0.000%
0.320%
2.413%
0.000%
0.000%
0.311%
0.000%
0.034%
1.053%
0.000%
0.000%
0.026%
0.000%
0.146%
0.172%
0.092%
0.000%
0.000%
0.000%
0.069%
0.118%
0.000%
0.000%
0.000%
0.000%
0.181%
0.130%
2.647%
0.000%
0.283%
SW
0.000%
0.000%
0.000%
0.704%
0.163%
0.148%
1.195%
2.632%
1.493%
1.282%
0.769%
0.000%
0.167%
3.614%
1.593%
0.000%
4.359%
0.000%
0.000%
0.000%
0.244%
0.355%
1.865%
0.000%
0.000%
0.000%
0.000%
0.000%
0.241%
0.417%
2.062%
0.000%
0.000%
2.676%
0.855%
0.000%
0.000%
0.000%
0.000%
0.515%
1.087%
1.299%
0.000%
0.640%
Minimum Detect
Concentration (u.g/L)
Total
0.17
5.13
0.1
0.009
0.14
0.19
1.5
0.06
0.35
0.1
0.18
0.1
0.15
0.1
0.04
0.1
0.5
1.14
1.4
0.1
19
0.28
0.29
0.3
0.1
0.11
0.6
0.05
0.1
0.02
0.009
GW
0.17
5.13
0.1
0.68
0.14
0.06
0.35
0.2
0.18
0.1
0.15
0.04
0.1
0.5
1.4
0.1
19
0.28
0.39
1.7
0.11
2.66
0.05
0.1
0.02
0.02
SW
0.1
0.009
0.5
0.19
1.5
0.16
0.69
0.1
1.1
0.2
0.1
0.12
1.14
1.95
0.1
0.29
0.3
0.1
0.22
0.6
1
0.2
0.02
0.009
Median Detect
Concentration (u.g/L)
Total
0.26
5.13
0.205
0.2
0.545
0.22
1.5
0.8
0.63
0.225
0.18
0.835
0.3
0.3
0.17
0.26
12.5
1.63
1.675
0.3
19
1.365
0.39
0.7
0.295
0.38
1.63
1
0.2
0.02
0.3
GW
0.26
5.13
0.1
0.68
0.59
0.98
0.53
0.25
0.18
0.57
0.15
0.17
0.24
12.5
1.4
0.305
19
1.365
5.195
2.15
0.155
2.66
0.525
0.2
0.02
0.3
SW
0.225
0.2
0.5
0.22
1.5
0.16
0.69
0.1
1.1
0.35
0.3
0.27
1.63
1.95
0.24
0.29
0.69
0.295
0.4
0.6
1
0.2
0.16
0.29
90th Percentile Detect
Concentration (u.g/L)
Total
0.36
5.13
0.47
0.68
0.6
0.22
1.5
1
0.69
0.27
0.18
2.2
0.8
0.7
1.1
0.78
34
2.12
1.95
1.2
19
5.9
10
2.6
0.5
0.63
2.66
1
0.4
0.3
1.5
GW
0.36
5.13
0.37
0.68
0.6
1
0.66
0.27
0.18
2.2
0.15
1.1
0.74
34
1.4
1.3
19
5.9
10
2.6
0.2
2.66
1
0.4
0.1
2
SW
5.435
3.31
0.5
0.22
1.5
0.16
0.69
0.1
1.1
0.8
0.7
1.06
2.12
1.95
0.47
0.29
0.7
0.5
0.63
0.6
1
0.2
0.5
1.1
Maximum Detect
Concentration (u.g/L)
Total
0.36
5.13
10.4
6.3
0.6
0.22
1.5
70
0.69
0.27
0.18
2.2
0.8
230
1.1
2.5
35
2.12
1.95
7.9
19
5.9
10
2.6
0.5
1.2
2.66
1
0.4
0.5
230
GW
0.36
5.13
0.49
0.68
0.6
70
0.66
0.27
0.18
2.2
0.15
1.1
1.21
35
1.4
7.9
19
5.9
10
2.6
0.2
2.66
1
0.4
0.1
70
SW
10.4
6.3
0.5
0.22
1.5
0.16
0.69
0.1
1.1
0.8
230
2.5
2.12
1.95
1.7
0.29
0.7
0.5
1.2
0.6
1
0.2
0.5
230
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A29b. 2,4-Dichlorophenoxyacetic acid —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
20
184
454
918
1,609
816
655
254
1,320
297
1,055
870
1,368
1,406
241
645
862
216
2,919
1,288
1,475
846
2,365
209
739
1,237
127
692
288
1,348
273
1,094
89
785
260
16
856
426
173
440
1,406
342
304
33,187
GW
15
132
382
870
1,283
597
617
251
1,298
283
1,022
813
1,264
1,362
92
528
794
190
2,858
1,259
1,398
786
2,228
182
728
1,196
116
657
267
1,117
194
944
80
725
239
5
702
389
63
407
1,386
197
256
30,172
SW
5
52
72
48
326
219
38
3
22
14
33
57
104
44
149
117
68
26
61
29
77
60
137
27
11
41
11
35
21
231
79
150
9
60
21
11
154
37
110
33
20
145
48
3,015
Total Population Served by Systems
Reporting
Total
316,451
2,871,122
2,453,348
6,045,047
33,683,424
4,994,023
2,595,127
624,615
16,799,674
997,274
2,542,641
1,064,826
9,183,247
4,871,953
4,596,328
8,509,903
4,906,001
491,237
7,224,193
3,933,642
3,281,888
757,811
6,885,177
559,198
1,454,673
945,754
1,969,193
1,656,892
960,568
4,925,666
6,515,428
2,939,761
900,695
3,448,394
622,152
1,212,043
18,700,247
2,500,671
2,380,983
432,449
3,883,613
1,367,674
446,177
187,451,183
GW
85,001
623,904
910,322
2,674,456
12,321,497
527,114
261,240
343,215
14,557,669
305,252
1,434,015
808,630
2,982,850
2,552,217
369,299
1,707,521
907,894
116,848
2,044,337
2,684,001
1,700,557
365,142
1,733,551
253,973
678,193
395,955
341,973
1,395,794
270,677
982,389
484,233
575,011
160,717
820,701
262,981
144,963
4,013,688
1,667,485
26,904
181,285
2,191,869
206,326
129,229
67,200,878
SW
231,450
2,247,218
1,543,026
3,370,591
21,361,927
4,466,909
2,333,887
281,400
2,242,005
692,022
1,108,626
256,196
6,200,397
2,319,736
4,227,029
6,802,382
3,998,107
374,389
5,179,856
1,249,641
1,581,331
392,669
5,151,626
305,225
776,480
549,799
1,627,220
261,098
689,891
3,943,277
6,031,195
2,364,750
739,978
2,627,693
359,171
1,067,080
14,686,559
833,186
2,354,079
251,164
1,691,744
1,161,348
316,948
120,250,305
Percent of Systems
with At Least One Detection
Total
5.000%
0.543%
0.000%
2.070%
0.435%
0.368%
0.611%
0.394%
0.833%
1.684%
0.379%
0.115%
0.292%
0.284%
6.639%
0.930%
6.381%
0.000%
0.000%
0.233%
0.136%
0.236%
4.482%
0.000%
0.000%
0.081%
0.000%
0.434%
1.042%
0.223%
0.366%
0.000%
0.000%
1.656%
0.769%
0.000%
0.000%
0.000%
0.000%
0.682%
0.284%
3.216%
0.000%
0.901%
GW
6.667%
0.758%
0.000%
1.609%
0.078%
0.335%
0.000%
0.000%
0.770%
1.413%
0.294%
0.123%
0.237%
0.073%
0.000%
1.136%
4.786%
0.000%
0.000%
0.238%
0.000%
0.127%
3.995%
0.000%
0.000%
0.084%
0.000%
0.457%
0.749%
0.090%
0.000%
0.000%
0.000%
0.276%
0.418%
0.000%
0.000%
0.000%
0.000%
0.491%
0.216%
4.569%
0.000%
0.669%
SW
0.000%
0.000%
0.000%
10.417%
1.840%
0.457%
10.526%
33.333%
4.545%
7.143%
3.030%
0.000%
0.962%
6.818%
10.738%
0.000%
25.000%
0.000%
0.000%
0.000%
2.597%
1.667%
12.409%
0.000%
0.000%
0.000%
0.000%
0.000%
4.762%
0.866%
1.266%
0.000%
0.000%
18.333%
4.762%
0.000%
0.000%
0.000%
0.000%
3.030%
5.000%
1.379%
0.000%
3.217%
Percent of Population Served
with At Least One Detection
Total
2.859%
0.417%
0.000%
38.197%
1.496%
0.039%
17.134%
16.854%
17.246%
18.503%
0.231%
0.005%
0.071%
23.746%
37.474%
0.984%
80.103%
0.000%
0.000%
0.036%
0.183%
0.307%
31.549%
0.000%
0.000%
0.003%
0.000%
0.510%
26.096%
0.275%
0.721%
0.000%
0.000%
8.626%
20.700%
0.000%
0.000%
0.000%
0.000%
3.739%
0.246%
0.596%
0.000%
8.714%
GW
10.642%
1.917%
0.000%
3.302%
0.455%
0.328%
0.000%
0.000%
18.239%
1.484%
0.077%
0.006%
0.138%
0.001%
0.000%
4.905%
19.868%
0.000%
0.000%
0.053%
0.000%
0.527%
25.492%
0.000%
0.000%
0.006%
0.000%
0.605%
1.717%
0.172%
0.000%
0.000%
0.000%
0.618%
0.252%
0.000%
0.000%
0.000%
0.000%
0.280%
0.380%
0.961%
0.000%
5.317%
SW
0.000%
0.000%
0.000%
65.886%
2.096%
0.005%
19.052%
37.409%
10.799%
26.011%
0.430%
0.000%
0.039%
49.871%
40.748%
0.000%
93.781%
0.000%
0.000%
0.000%
0.380%
0.102%
33.587%
0.000%
0.000%
0.000%
0.000%
0.000%
35.661%
0.301%
0.779%
0.000%
0.000%
11.127%
35.673%
0.000%
0.000%
0.000%
0.000%
6.236%
0.073%
0.532%
0.000%
10.613%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A29c. 2,4-Dichlorophenoxyacetic acid — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 70 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Percent of Systems
with At Least One Detection
> 70 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.415%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.033%
Population Served by Systems
with At Least One Detection
> 70 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
13,933
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
13,933
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
13,933
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
13,933
Percent of Population Served
with At Least One Detection
> 70 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.303%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.330%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.012%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A29d. 2,4-Dichlorophenoxyacetic acid — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 40 ug/L
Total
0
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
GW
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Percent of Systems
with At Least One Detection
> 40 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.076%
0.000%
0.000%
0.000%
0.000%
0.000%
0.415%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.006%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.077%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.033%
Population Served by Systems
with At Least One Detection
> 40 ug/L
Total
0
0
0
0
0
0
0
0
1,810
0
0
0
0
0
13,933
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15,743
GW
0
0
0
0
0
0
0
0
1,810
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1,810
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
13,933
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
13,933
Percent of Population Served
with At Least One Detection
> 40 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.011%
0.000%
0.000%
0.000%
0.000%
0.000%
0.303%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.008%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.012%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.330%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.012%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A29e. 2,4-Dichlorophenoxyacetic acid — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 35 ug/L
Total
0
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3
GW
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Percent of Systems
with At Least One Detection
> 35 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.076%
0.000%
0.000%
0.000%
0.000%
0.000%
0.415%
0.000%
0.000%
0.000%
0.000%
0.078%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.009%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.077%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.079%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.033%
Population Served by Systems
with At Least One Detection
> 35 ug/L
Total
0
0
0
0
0
0
0
0
1,810
0
0
0
0
0
13,933
0
0
0
0
35
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15,778
GW
0
0
0
0
0
0
0
0
1,810
0
0
0
0
0
0
0
0
0
0
35
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1,845
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
13,933
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
13,933
Percent of Population Served
with At Least One Detection
> 35 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.011%
0.000%
0.000%
0.000%
0.000%
0.000%
0.303%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.008%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.012%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.330%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.012%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A30. 1,2-Dichloropropane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
Total # Systems
Reporting
46,180
46,180
46,180
46,180
4,257
4,257
4,257
4,257
50,437
50,437
50,437
50,437
# Systems Exceeding
Threshold of Interest
8
33
84
150
2
6
14
15
10
39
98
165
% Systems Exceeding
Threshold of Interest
0.017%
0.071%
0.182%
0.325%
0.047%
0.141%
0.329%
0.352%
0.020%
0.077%
0.194%
0.327%
Total Pop. Served by
Systems Reporting
86,395,709
86,395,709
86,395,709
86,395,709
140,516,425
140,516,425
140,516,425
140,516,425
226,912,134
226,912,134
226,912,134
226,912,134
Total Pop. Served by
Systems Exceeding
Threshold of Interest
16,691
43,469
464,180
666,040
334,996
1,094,057
7,662,775
8,053,925
351,687
1,137,526
8,126,955
8,719,965
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.019%
0.050%
0.537%
0.771%
0.238%
0.779%
5.453%
5.732%
0.155%
0.501%
3.582%
3.843%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A30a. 1,2-Dichloropropane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,108
821
3,969
11,702
85,571
2,871
6,938
1,048
4,147
7,176
1,790
1,776
3,765
6,996
4,622
3,313
16,249
6,772
3,698
10,753
8,582
7,544
4,491
19,065
552
6,844
9,581
20,355
6,576
3,209
7,078
8,852
5,636
2,324
1,959
4,342
889
2,936
34,143
8,993
4,932
4,350
11,290
1,142
1,659
374,409
GW
1,971
597
3,237
9,533
45,296
2,131
6,047
1,018
4,079
6,349
1,687
1,651
3,304
6,436
4,312
1,126
12,259
5,511
3,383
9,743
7,333
6,695
3,952
17,486
417
6,265
9,103
18,567
6,100
2,577
5,407
7,689
4,201
1,682
1,591
3,803
855
1,165
27,039
7,562
4,058
3,956
11,165
444
1,156
289,938
SW
1,137
224
732
2,169
40,275
740
891
30
68
827
103
125
461
560
310
2,187
3,990
1,261
315
1,010
1,249
849
539
1,579
135
579
478
1,788
476
632
1,671
1,163
1,435
642
368
539
34
1,771
7,104
1,431
874
394
125
698
503
84,471
Percent of Samples
with Detections
Total
0.064%
0.122%
0.126%
0.043%
0.293%
0.000%
1.009%
0.000%
0.241%
0.223%
0.056%
0.169%
0.000%
0.057%
0.130%
0.272%
0.018%
0.340%
0.027%
0.186%
0.338%
0.013%
0.045%
1.317%
0.000%
0.161%
0.417%
0.265%
0.015%
0.000%
0.113%
0.045%
0.071%
0.086%
0.000%
0.299%
0.337%
0.034%
0.012%
0.000%
0.081%
0.046%
0.390%
1.226%
0.000%
0.246%
GW
0.101%
0.168%
0.154%
0.021%
0.068%
0.000%
1.141%
0.000%
0.245%
0.252%
0.059%
0.182%
0.000%
0.062%
0.139%
0.000%
0.008%
0.417%
0.030%
0.205%
0.395%
0.015%
0.051%
1.435%
0.000%
0.176%
0.439%
0.237%
0.016%
0.000%
0.111%
0.052%
0.071%
0.119%
0.000%
0.289%
0.351%
0.086%
0.015%
0.000%
0.099%
0.051%
0.394%
2.477%
0.000%
0.231%
SW
0.000%
0.000%
0.000%
0.138%
0.546%
0.000%
0.112%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.412%
0.050%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.559%
0.000%
0.000%
0.120%
0.000%
0.070%
0.000%
0.000%
0.371%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.430%
0.000%
0.300%
Minimum Detect
Concentration (u.g/L)
Total
0.68
0.51
0.11
0.5
0.25
0.5
0.09
0.5
1
0.6
0.63
0.5
0.005
0.8
0.5
0.5
0.4
0.2
2.66
0.58
0.5
0.6
0.32
0.1
1.2
0.5
0.11
0.5
0.7
0.52
0.5
0.7
0.5
1
0.2
0.01
0.11
0.005
GW
0.68
0.51
0.11
0.6
0.25
0.5
0.09
0.5
1
0.6
0.63
0.5
1.83
0.5
0.5
0.4
0.2
2.66
0.58
0.5
0.6
0.32
0.1
1.2
0.5
0.11
0.5
0.7
0.52
0.5
0.7
0.5
1
0.2
0.01
0.11
0.01
SW
0.5
0.5
0.8
0.005
0.8
0.1
0.5
0.5
10
0.5
0.005
Median Detect
Concentration (u.g/L)
Total
2.69
0.51
0.16
0.5
1.1
3.1
0.275
1.1
1
0.6
0.725
0.79
0.5
1
1.1
0.5
0.65
0.4
2.66
0.71
1
0.99
1.7
0.505
1.2
0.5
1.7
0.55
1.35
1.41
0.5
0.7
0.9
1.4
0.6
0.465
0.5
1
GW
2.69
0.51
0.16
1.4
0.55
3.1
0.275
1.1
1
0.6
0.725
0.79
1.83
1.1
0.5
0.65
0.4
2.66
0.71
1
0.99
1.7
0.5
1.2
0.8
1.7
0.6
1.35
0.97
0.5
0.7
0.9
1.4
0.6
0.465
0.5
0.9
SW
0.5
1.2
0.8
0.5
0.9
0.65
0.5
0.5
10
0.5
1.1
90th Percentile Detect
Concentration (u.g/L)
Total
4.7
0.51
0.22
2.2
2.5
6.45
3.95
1.3
1
1.4
2.91
1.6
1
1.83
2
0.5
2.35
1.3
2.66
0.84
2.4
2.43
2.4
2.4
1.2
10.6
11
5.7
2
10
0.5
0.7
1.9
1.7
1
1.3
0.5
2.9
GW
4.7
0.51
0.22
2.2
1
6.5
3.95
1.3
1
1.4
2.91
1.6
1.83
2
0.5
2.35
1.3
2.66
0.84
2.4
2.43
2.4
2.9
1.2
10.6
11
5.7
2
3.22
0.5
0.7
1.9
1.7
1
1.3
0.5
3.1
SW
0.5
2.55
0.8
1
1
1.55
0.5
0.5
10
1
2.5
Maximum Detect
Concentration (u.g/L)
Total
4.7
0.51
0.22
2.2
26.2
11.3
4
1.5
1
1.4
2.91
1.6
1
1.83
5.2
0.5
4.4
4.7
2.66
0.84
9.5
3.3
3
3.9
1.2
10.6
11
5.7
2
10
0.5
0.7
1.9
1.7
1
3.3
1
26.2
GW
4.7
0.51
0.22
2.2
2.8
11.3
4
1.5
1
1.4
2.91
1.6
1.83
5.2
0.5
4.4
4.7
2.66
0.84
9.5
3.3
3
3.9
1.2
10.6
11
5.7
2
3.29
0.5
0.7
1.9
1.7
1
3.3
0.5
11.3
SW
0.5
26.2
0.8
1
1
1.8
0.5
0.5
10
1
26.2
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A30b. 1,2-Dichloropropane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
263
454
1,059
3,649
826
1,207
318
1,509
1,822
106
1,056
935
1,429
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
210
771
1,258
1,398
726
338
1,525
1,944
730
1,097
145
819
245
351
4,951
500
1,600
603
1,783
403
304
50,437
GW
474
202
382
1,011
3,132
605
1,168
315
1,483
1,706
94
1,023
878
1,325
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
183
760
1,217
1,361
687
317
1,289
1,819
518
945
136
757
233
162
4,609
454
1,429
560
1,763
243
256
46,180
SW
146
61
72
48
517
221
39
3
26
116
12
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
171
43
20
160
48
4,257
Total Population Served by Systems
Reporting
Total
606,193
4,218,278
2,453,348
6,166,873
35,802,685
4,997,841
2,723,376
698,987
17,495,514
7,485,298
1,293,745
2,543,141
1,093,666
9,217,431
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,748,495
1,698,755
973,592
4,895,654
10,227,597
3,123,687
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,273,258
491,035
4,039,401
1,416,020
446,177
226,912,134
GW
232,590
1,123,190
910,322
2,796,282
13,514,997
530,207
389,454
417,587
15,249,472
1,592,517
1,239,117
1,434,515
837,604
3,017,034
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,712,549
1,432,207
283,701
1,045,052
3,132,660
664,833
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
630,675
227,067
2,347,657
237,670
129,229
86,395,709
SW
373,603
3,095,088
1,543,026
3,370,591
22,287,688
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,642,583
263,968
1,691,744
1,178,350
316,948
140,516,425
Percent of Systems
with At Least One Detection
Total
0.323%
0.380%
0.881%
0.189%
0.603%
0.000%
0.414%
0.000%
0.398%
0.329%
0.943%
0.284%
0.000%
0.140%
0.271%
2.490%
0.279%
0.759%
0.123%
0.437%
1.264%
0.071%
0.236%
1.732%
0.000%
0.389%
0.238%
1.502%
0.138%
0.000%
0.459%
0.154%
0.548%
0.182%
0.000%
0.366%
0.408%
0.285%
0.020%
0.000%
0.063%
0.332%
1.290%
3.474%
0.000%
0.480%
GW
0.422%
0.495%
1.047%
0.099%
0.447%
0.000%
0.342%
0.000%
0.405%
0.352%
1.064%
0.293%
0.000%
0.151%
0.280%
0.000%
0.167%
0.811%
0.132%
0.447%
1.289%
0.075%
0.254%
1.840%
0.000%
0.395%
0.247%
1.396%
0.146%
0.000%
0.388%
0.165%
0.579%
0.212%
0.000%
0.264%
0.429%
0.617%
0.022%
0.000%
0.070%
0.357%
1.305%
4.527%
0.000%
0.468%
SW
0.000%
0.000%
0.000%
2.083%
1.547%
0.000%
2.564%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.027%
0.847%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.405%
0.000%
0.000%
0.847%
0.000%
0.472%
0.000%
0.000%
1.613%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.875%
0.000%
0.611%
Percent of Population Served
with At Least One Detection
Total
0.040%
0.635%
0.214%
4.865%
19.154%
0.000%
14.874%
0.000%
2.766%
0.055%
0.050%
0.037%
0.000%
0.015%
0.018%
9.098%
0.208%
0.795%
0.030%
0.040%
3.340%
0.109%
0.014%
0.369%
0.000%
0.183%
0.036%
13.881%
0.010%
0.000%
0.098%
0.045%
0.051%
0.010%
0.000%
7.929%
2.064%
0.093%
0.002%
0.000%
0.001%
0.967%
0.760%
2.193%
0.000%
4.483%
GW
0.104%
2.384%
0.577%
0.001%
3.423%
0.000%
3.574%
0.000%
3.174%
0.260%
0.052%
0.065%
0.000%
0.046%
0.034%
0.000%
0.009%
3.896%
0.073%
0.146%
4.727%
0.194%
0.029%
1.492%
0.000%
0.391%
0.087%
5.226%
0.011%
0.000%
0.429%
0.146%
0.079%
0.052%
0.000%
0.062%
2.832%
0.362%
0.005%
0.000%
0.010%
2.090%
1.308%
1.018%
0.000%
1.644%
SW
0.000%
0.000%
0.000%
8.901%
28.693%
0.000%
16.759%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
9.906%
0.260%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
18.543%
0.000%
0.000%
0.008%
0.000%
0.044%
0.000%
0.000%
10.126%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.430%
0.000%
6.229%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A30c. 1,2-Dichloropropane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 5 ug/L
Total
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
3
0
0
0
0
0
0
1
1
1
0
0
1
0
0
0
0
0
0
0
0
0
10
GW
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
3
0
0
0
0
0
0
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
8
sw
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
2
Percent of Systems
with At Least One Detection
> 5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.027%
0.000%
0.083%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.095%
0.000%
0.000%
0.000%
0.000%
0.000%
0.127%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.066%
0.051%
0.137%
0.000%
0.000%
0.122%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.020%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.086%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.101%
0.000%
0.000%
0.000%
0.000%
0.000%
0.135%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.078%
0.055%
0.193%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.017%
sw
0.000%
0.000%
0.000%
0.000%
0.193%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.613%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.047%
Population Served by Systems
with At Least One Detection
> 5 ug/L
Total
0
0
0
0
69,300
0
13,707
0
0
0
0
0
0
0
0
0
0
45
0
0
0
0
0
832
0
0
0
0
0
0
1,685
342
80
0
0
265,696
0
0
0
0
0
0
0
0
0
351,687
GW
0
0
0
0
0
0
13,707
0
0
0
0
0
0
0
0
0
0
45
0
0
0
0
0
832
0
0
0
0
0
0
1,685
342
80
0
0
0
0
0
0
0
0
0
0
0
0
16,691
SW
0
0
0
0
69,300
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
265,696
0
0
0
0
0
0
0
0
0
334,996
Percent of Population Served
with At Least One Detection
> 5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.194%
0.000%
0.503%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.012%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.034%
0.003%
0.003%
0.000%
0.000%
7.915%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.155%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.520%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
0.000%
0.000%
0.000%
0.000%
0.000%
0.048%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.161%
0.011%
0.012%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.019%
sw
0.000%
0.000%
0.000%
0.000%
0.311%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
10.126%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.238%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A30d. 1,2-Dichloropropane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2.5 ug/L
Total
1
0
0
0
6
0
2
0
1
0
0
0
0
1
0
0
0
1
0
2
1
1
0
9
0
1
1
5
0
0
1
1
1
0
0
2
0
0
0
0
0
0
2
0
0
39
GW
1
0
0
0
1
0
2
0
1
0
0
0
0
1
0
0
0
1
0
2
1
1
0
9
0
1
1
5
0
0
1
1
1
0
0
1
0
0
0
0
0
0
2
0
0
33
SW
0
0
0
0
5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
6
Percent of Systems
with At Least One Detection
> 2.5 ug/L
Total
0.161%
0.000%
0.000%
0.000%
0.164%
0.000%
0.166%
0.000%
0.066%
0.000%
0.000%
0.000%
0.000%
0.070%
0.000%
0.000%
0.000%
0.095%
0.000%
0.067%
0.063%
0.071%
0.000%
0.380%
0.000%
0.130%
0.079%
0.358%
0.000%
0.000%
0.066%
0.051%
0.137%
0.000%
0.000%
0.244%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.112%
0.000%
0.000%
0.077%
GW
0.211%
0.000%
0.000%
0.000%
0.032%
0.000%
0.171%
0.000%
0.067%
0.000%
0.000%
0.000%
0.000%
0.075%
0.000%
0.000%
0.000%
0.101%
0.000%
0.069%
0.064%
0.075%
0.000%
0.404%
0.000%
0.132%
0.082%
0.367%
0.000%
0.000%
0.078%
0.055%
0.193%
0.000%
0.000%
0.132%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.113%
0.000%
0.000%
0.071%
SW
0.000%
0.000%
0.000%
0.000%
0.967%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.613%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.141%
Population Served by Systems
with At Least One Detection
> 2.5 ug/L
Total
158
0
0
0
828,611
0
13,802
0
16,800
0
0
0
0
980
0
0
0
45
0
530
25
3,273
0
2,460
0
1,066
48
1,032
0
0
1,685
342
80
0
0
265,738
0
0
0
0
0
0
851
0
0
1,137,526
GW
158
0
0
0
250
0
13,802
0
16,800
0
0
0
0
980
0
0
0
45
0
530
25
3,273
0
2,460
0
1,066
48
1,032
0
0
1,685
342
80
0
0
42
0
0
0
0
0
0
851
0
0
43,469
SW
0
0
0
0
828,361
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
265,696
0
0
0
0
0
0
0
0
0
1,094,057
Percent of Population Served
with At Least One Detection
> 2.5 ug/L
Total
0.026%
0.000%
0.000%
0.000%
2.314%
0.000%
0.507%
0.000%
0.096%
0.000%
0.000%
0.000%
0.000%
0.011%
0.000%
0.000%
0.000%
0.001%
0.000%
0.007%
0.001%
0.109%
0.000%
0.035%
0.000%
0.073%
0.005%
0.013%
0.000%
0.000%
0.034%
0.003%
0.003%
0.000%
0.000%
7.916%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.021%
0.000%
0.000%
0.501%
GW
0.068%
0.000%
0.000%
0.000%
0.002%
0.000%
3.544%
0.000%
0.110%
0.000%
0.000%
0.000%
0.000%
0.032%
0.000%
0.000%
0.000%
0.004%
0.000%
0.027%
0.001%
0.194%
0.000%
0.142%
0.000%
0.155%
0.012%
0.038%
0.000%
0.000%
0.161%
0.011%
0.012%
0.000%
0.000%
0.006%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.036%
0.000%
0.000%
0.050%
SW
0.000%
0.000%
0.000%
0.000%
3.717%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
10.126%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.779%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A30e. 1,2-Dichloropropane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>lug/L
Total
1
0
0
1
13
0
3
0
2
1
1
1
0
1
1
1
2
3
0
4
6
1
0
24
0
2
2
10
1
0
2
1
1
1
0
2
0
0
1
0
1
1
6
1
0
98
GW
1
0
0
1
5
0
3
0
2
1
1
1
0
1
1
0
1
3
0
4
6
1
0
24
0
2
2
8
1
0
2
1
1
1
0
1
0
0
1
0
1
1
6
0
0
84
SW
0
0
0
0
8
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
14
Percent of Systems
with At Least One Detection
> 1 ug/L
Total
0.161%
0.000%
0.000%
0.094%
0.356%
0.000%
0.249%
0.000%
0.133%
0.055%
0.943%
0.095%
0.000%
0.070%
0.068%
0.415%
0.279%
0.285%
0.000%
0.135%
0.379%
0.071%
0.000%
1.014%
0.000%
0.259%
0.159%
0.715%
0.138%
0.000%
0.131%
0.051%
0.137%
0.091%
0.000%
0.244%
0.000%
0.000%
0.020%
0.000%
0.063%
0.166%
0.337%
0.248%
0.000%
0.194%
GW
0.211%
0.000%
0.000%
0.099%
0.160%
0.000%
0.257%
0.000%
0.135%
0.059%
1.064%
0.098%
0.000%
0.075%
0.070%
0.000%
0.167%
0.304%
0.000%
0.137%
0.387%
0.075%
0.000%
1.077%
0.000%
0.263%
0.164%
0.588%
0.146%
0.000%
0.155%
0.055%
0.193%
0.106%
0.000%
0.132%
0.000%
0.000%
0.022%
0.000%
0.070%
0.179%
0.340%
0.000%
0.000%
0.182%
SW
0.000%
0.000%
0.000%
0.000%
1.547%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
0.847%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.405%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.613%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.625%
0.000%
0.329%
Population Served by Systems
with At Least One Detection
>lug/L
Total
158
0
0
30
6,742,015
0
13,890
0
37,296
1,000
650
739
0
980
258
48,800
17,842
25,345
0
1,280
1,209
3,273
0
17,723
0
2,647
96
935,815
163
0
1,785
342
80
31
0
265,738
0
0
474
0
60
90
5,346
1,800
0
8,126,955
GW
158
0
0
30
347,020
0
13,890
0
37,296
1,000
650
739
0
980
258
0
152
25,345
0
1,280
1,209
3,273
0
17,723
0
2,647
96
2,021
163
0
1,785
342
80
31
0
42
0
0
474
0
60
90
5,346
0
0
464,180
SW
0
0
0
0
6,394,995
0
0
0
0
0
0
0
0
0
0
48,800
17,690
0
0
0
0
0
0
0
0
0
0
933,794
0
0
0
0
0
0
0
265,696
0
0
0
0
0
0
0
1,800
0
7,662,775
Percent of Population Served
with At Least One Detection
>lug/L
Total
0.026%
0.000%
0.000%
0.000%
18.831%
0.000%
0.510%
0.000%
0.213%
0.013%
0.050%
0.029%
0.000%
0.011%
0.005%
1.060%
0.208%
0.505%
0.000%
0.018%
0.028%
0.109%
0.000%
0.253%
0.000%
0.181%
0.010%
12.077%
0.010%
0.000%
0.036%
0.003%
0.003%
0.001%
0.000%
7.916%
0.000%
0.000%
0.002%
0.000%
0.001%
0.018%
0.132%
0.127%
0.000%
3.582%
GW
0.068%
0.000%
0.000%
0.001%
2.568%
0.000%
3.567%
0.000%
0.245%
0.063%
0.052%
0.052%
0.000%
0.032%
0.010%
0.000%
0.009%
2.472%
0.000%
0.065%
0.040%
0.194%
0.000%
1.023%
0.000%
0.386%
0.024%
0.075%
0.011%
0.000%
0.171%
0.011%
0.012%
0.005%
0.000%
0.006%
0.000%
0.000%
0.005%
0.000%
0.010%
0.040%
0.228%
0.000%
0.000%
0.537%
SW
0.000%
0.000%
0.000%
0.000%
28.693%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.154%
0.260%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
18.543%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
10.126%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.153%
0.000%
5.453%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A30f. 1,2-Dichloropropane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.5 ug/L
Total
2
1
0
1
21
0
5
0
2
5
1
3
0
2
3
1
2
7
0
11
9
1
2
41
0
3
2
13
1
0
2
1
2
2
0
3
0
1
1
0
1
1
11
1
0
165
GW
2
1
0
1
13
0
4
0
2
5
1
3
0
2
3
0
1
7
0
11
9
1
2
41
0
3
2
11
1
0
2
1
2
2
0
2
0
1
1
0
1
1
11
0
0
150
SW
0
0
0
0
8
0
1
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
15
Percent of Systems
with At Least One Detection
> 0.5 ug/L
Total
0.323%
0.380%
0.000%
0.094%
0.576%
0.000%
0.414%
0.000%
0.133%
0.274%
0.943%
0.284%
0.000%
0.140%
0.204%
0.415%
0.279%
0.664%
0.000%
0.370%
0.569%
0.071%
0.236%
1.732%
0.000%
0.389%
0.159%
0.930%
0.138%
0.000%
0.131%
0.051%
0.274%
0.182%
0.000%
0.366%
0.000%
0.285%
0.020%
0.000%
0.063%
0.166%
0.617%
0.248%
0.000%
0.327%
GW
0.422%
0.495%
0.000%
0.099%
0.415%
0.000%
0.342%
0.000%
0.135%
0.293%
1.064%
0.293%
0.000%
0.151%
0.210%
0.000%
0.167%
0.710%
0.000%
0.378%
0.580%
0.075%
0.254%
1.840%
0.000%
0.395%
0.164%
0.808%
0.146%
0.000%
0.155%
0.055%
0.386%
0.212%
0.000%
0.264%
0.000%
0.617%
0.022%
0.000%
0.070%
0.179%
0.624%
0.000%
0.000%
0.325%
SW
0.000%
0.000%
0.000%
0.000%
1.547%
0.000%
2.564%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
0.847%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.405%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.613%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.625%
0.000%
0.352%
Population Served by Systems
with At Least One Detection
> 0.5 ug/L
Total
241
26,778
0
30
6,857,618
0
405,070
0
37,296
4,094
650
934
0
1,380
347
48,800
17,842
39,878
0
2,255
20,118
3,273
106
25,849
0
2,681
96
942,132
163
0
1,785
342
212
301
0
266,150
0
5,294
474
0
60
90
5,826
1,800
0
8,719,965
GW
241
26,778
0
30
462,623
0
13,920
0
37,296
4,094
650
934
0
1,380
347
0
152
39,878
0
2,255
20,118
3,273
106
25,849
0
2,681
96
8,338
163
0
1,785
342
212
301
0
454
0
5,294
474
0
60
90
5,826
0
0
666,040
SW
0
0
0
0
6,394,995
0
391,150
0
0
0
0
0
0
0
0
48,800
17,690
0
0
0
0
0
0
0
0
0
0
933,794
0
0
0
0
0
0
0
265,696
0
0
0
0
0
0
0
1,800
0
8,053,925
Percent of Population Served
with At Least One Detection
> 0.5 ug/L
Total
0.040%
0.635%
0.000%
0.000%
19.154%
0.000%
14.874%
0.000%
0.213%
0.055%
0.050%
0.037%
0.000%
0.015%
0.007%
1.060%
0.208%
0.794%
0.000%
0.032%
0.472%
0.109%
0.014%
0.369%
0.000%
0.183%
0.010%
12.159%
0.010%
0.000%
0.036%
0.003%
0.007%
0.010%
0.000%
7.929%
0.000%
0.093%
0.002%
0.000%
0.001%
0.018%
0.144%
0.127%
0.000%
3.843%
GW
0.104%
2.384%
0.000%
0.001%
3.423%
0.000%
3.574%
0.000%
0.245%
0.257%
0.052%
0.065%
0.000%
0.046%
0.013%
0.000%
0.009%
3.889%
0.000%
0.114%
0.668%
0.194%
0.029%
1.492%
0.000%
0.391%
0.024%
0.307%
0.011%
0.000%
0.171%
0.011%
0.032%
0.052%
0.000%
0.062%
0.000%
0.362%
0.005%
0.000%
0.010%
0.040%
0.248%
0.000%
0.000%
0.771%
SW
0.000%
0.000%
0.000%
0.000%
28.693%
0.000%
16.759%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.154%
0.260%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
18.543%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
10.126%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.153%
0.000%
5.732%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A31. Dinoseb — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 7 ug/L
> 3.5 ug/L
> 7 ug/L
> 3.5 ug/L
> 7 ug/L
> 3.5 ug/L
Total # Systems
Reporting
29,785
29,785
2,928
2,928
32,713
32,713
# Systems Exceeding
Threshold of Interest
5
6
0
0
5
6
% Systems Exceeding
Threshold of Interest
0.017%
0.020%
0.000%
0.000%
0.015%
0.018%
Total Pop. Served by
Systems Reporting
66,425,963
66,425,963
116,493,427
116,493,427
182,919,390
182,919,390
Total Pop. Served by
Systems Exceeding
Threshold of Interest
26,212
26,292
0
0
26,212
26,292
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.039%
0.040%
0.000%
0.000%
0.014%
0.014%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A31a. Dinoseb — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
73
560
1,588
6,826
13,983
2,527
1,590
826
2,390
1,433
1,732
2,074
3,182
2,289
1,756
2,962
2,494
378
6,582
4,627
5,803
3,192
13,956
404
2,220
4,193
162
4,347
1,571
2,882
145
2,061
740
3,304
952
59
2,175
7,077
441
1,298
3,162
639
1,241
121,896
GW
39
396
1,357
5,406
8,183
1,849
1,273
788
2,323
1,355
1,602
1,793
2,648
2,123
444
2,170
1,700
317
6,289
4,495
4,984
2,910
12,723
341
2,143
3,874
144
4,100
1,163
2,170
54
1,579
498
2,893
842
12
1,343
5,894
148
1,104
3,070
334
934
99,807
SW
34
164
231
1,420
5,800
678
317
38
67
78
130
281
534
166
1,312
792
794
61
293
132
819
282
1,233
63
77
319
18
247
408
712
91
482
242
411
110
47
832
1,183
293
194
92
305
307
22,089
Percent of Samples
with Detections
Total
0.000%
0.536%
0.000%
0.308%
0.007%
0.000%
0.000%
1.695%
0.544%
0.000%
0.000%
0.000%
0.000%
0.087%
0.399%
0.338%
0.882%
0.000%
0.046%
0.000%
0.000%
0.282%
0.107%
0.248%
0.180%
0.000%
0.000%
0.092%
0.064%
0.069%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.092%
0.000%
0.000%
0.154%
0.127%
0.939%
0.000%
0.120%
GW
0.000%
0.505%
0.000%
0.314%
0.012%
0.000%
0.000%
1.777%
0.560%
0.000%
0.000%
0.000%
0.000%
0.094%
0.000%
0.369%
0.882%
0.000%
0.048%
0.000%
0.000%
0.309%
0.102%
0.293%
0.187%
0.000%
0.000%
0.098%
0.086%
0.092%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.181%
0.130%
1.497%
0.000%
0.120%
SW
0.000%
0.610%
0.000%
0.282%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.534%
0.253%
0.882%
0.000%
0.000%
0.000%
0.000%
0.000%
0.162%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.240%
0.000%
0.000%
0.000%
0.000%
0.328%
0.000%
0.118%
Minimum Detect
Concentration (u.g/L)
Total
0.7
0.2
2
0.08
0.05
0.1
0.07
0.1
0.07
0.13
7.3
0.2
0.71
2.1
1.66
0.1
1.3
1.8
0.18
0.1
0.03
0.03
GW
0.7
0.2
2
0.08
0.05
0.1
0.1
0.07
0.13
7.3
0.2
0.71
2.1
1.66
0.1
1.3
0.18
0.1
0.03
0.03
SW
1.09
0.2
0.07
0.1
0.14
0.3
1.8
0.5
0.07
Median Detect
Concentration (u.g/L)
Total
1.09
0.23
2
3.805
0.1
0.545
0.2
0.5
0.16
0.3
16
0.32
0.71
16.95
1.86
0.1
1.45
1.8
0.34
0.2
0.03
0.32
GW
1.345
0.23
2
3.805
0.1
0.545
0.85
0.14
0.3
16
0.32
0.71
16.95
1.86
0.1
1.45
0.34
0.2
0.03
0.385
SW
1.09
0.25
0.2
0.1
0.24
0.31
1.8
0.5
0.3
90th Percentile Detect
Concentration (u.g/L)
Total
1.99
0.43
2
12.3
0.1
0.99
3
1.5
0.71
0.4
25
1.6
0.71
45
2.6
0.1
1.6
1.8
0.5
0.2
1
9.2
GW
1.99
0.99
2
12.3
0.1
0.99
2
1.1
0.4
25
1.6
0.71
45
2.6
0.1
1.6
0.5
0.2
1
10.55
SW
1.09
0.3
3
0.1
0.71
0.32
1.8
0.5
3
Maximum Detect
Concentration (u.g/L)
Total
1.99
1.3
2
14.7
1.3
0.99
3
2
1.19
0.4
25
3.1
0.71
45
2.6
0.1
1.6
1.8
0.5
0.2
1
45
GW
1.99
1.3
2
14.7
1.3
0.99
2
1.19
0.4
25
3.1
0.71
45
2.6
0.1
1.6
0.5
0.2
1
45
SW
1.09
0.3
3
0.1
0.71
0.32
1.8
0.5
3
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A31b. Dinoseb — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
19
178
454
918
1,573
814
730
254
1,318
297
1,056
870
1,121
1,403
243
645
863
216
2,918
1,288
1,475
846
2,365
209
739
1,237
127
691
287
1,346
37
1,088
89
785
260
11
856
425
173
440
1,406
339
304
32,713
GW
14
129
382
870
1,252
595
693
251
1,296
283
1,023
813
1,020
1,359
93
528
795
190
2,857
1,259
1,398
786
2,228
182
728
1,196
116
656
266
1,116
28
938
80
725
239
5
702
388
63
407
1,386
194
256
29,785
SW
5
49
72
48
321
219
37
3
22
14
33
57
101
44
150
117
68
26
61
29
77
60
137
27
11
41
11
35
21
230
9
150
9
60
21
6
154
37
110
33
20
145
48
2,928
Total Population Served by Systems
Reporting
Total
316,371
2,781,727
2,453,348
6,045,047
33,363,077
4,993,497
2,605,694
624,615
16,796,064
997,274
2,543,237
1,064,826
9,097,009
4,867,546
4,612,320
8,509,903
4,906,061
491,237
7,224,067
3,933,642
3,281,888
757,811
6,885,177
559,198
1,454,673
945,754
1,969,193
1,656,692
960,268
4,923,979
3,029,193
2,937,839
900,695
3,448,394
622,152
648,720
18,700,247
2,500,321
2,380,983
432,449
3,883,613
1,367,412
446,177
182,919,390
GW
84,921
610,396
910,322
2,674,456
12,014,383
526,588
278,427
343,215
14,554,059
305,252
1,434,611
808,630
2,901,087
2,547,810
375,460
1,707,521
907,954
116,848
2,044,211
2,684,001
1,700,557
365,142
1,733,551
253,973
678,193
395,955
341,973
1,395,594
270,377
982,289
99,582
573,089
160,717
820,701
262,981
144,963
4,013,688
1,667,135
26,904
181,285
2,191,869
206,064
129,229
66,425,963
SW
231,450
2,171,331
1,543,026
3,370,591
21,348,694
4,466,909
2,327,267
281,400
2,242,005
692,022
1,108,626
256,196
6,195,922
2,319,736
4,236,860
6,802,382
3,998,107
374,389
5,179,856
1,249,641
1,581,331
392,669
5,151,626
305,225
776,480
549,799
1,627,220
261,098
689,891
3,941,690
2,929,611
2,364,750
739,978
2,627,693
359,171
503,757
14,686,559
833,186
2,354,079
251,164
1,691,744
1,161,348
316,948
116,493,427
Percent of Systems
with At Least One Detection
Total
0.000%
1.685%
0.000%
0.871%
0.064%
0.000%
0.000%
1.181%
0.607%
0.000%
0.000%
0.000%
0.000%
0.143%
2.058%
0.930%
1.738%
0.000%
0.103%
0.000%
0.000%
0.118%
0.381%
0.478%
0.541%
0.000%
0.000%
0.434%
0.348%
0.074%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.117%
0.000%
0.000%
0.455%
0.284%
1.770%
0.000%
0.266%
GW
0.000%
1.550%
0.000%
0.690%
0.080%
0.000%
0.000%
1.195%
0.617%
0.000%
0.000%
0.000%
0.000%
0.147%
0.000%
0.758%
1.509%
0.000%
0.105%
0.000%
0.000%
0.127%
0.314%
0.549%
0.549%
0.000%
0.000%
0.457%
0.376%
0.090%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.491%
0.289%
2.577%
0.000%
0.235%
SW
0.000%
2.041%
0.000%
4.167%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.333%
1.709%
4.412%
0.000%
0.000%
0.000%
0.000%
0.000%
1.460%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.649%
0.000%
0.000%
0.000%
0.000%
0.690%
0.000%
0.581%
Percent of Population Served
with At Least One Detection
Total
0.000%
0.837%
0.000%
8.607%
0.037%
0.000%
0.000%
11.058%
15.506%
0.000%
0.000%
0.000%
0.000%
0.009%
7.436%
0.767%
35.528%
0.000%
0.043%
0.000%
0.000%
0.015%
0.402%
0.657%
1.794%
0.000%
0.000%
5.404%
0.177%
0.034%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.454%
0.000%
0.000%
0.117%
0.541%
0.420%
0.000%
3.087%
GW
0.000%
3.149%
0.000%
3.581%
0.103%
0.000%
0.000%
20.124%
17.895%
0.000%
0.000%
0.000%
0.000%
0.017%
0.000%
0.845%
1.441%
0.000%
0.151%
0.000%
0.000%
0.030%
1.162%
1.446%
3.848%
0.000%
0.000%
6.415%
0.629%
0.172%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.280%
0.958%
0.665%
0.000%
4.513%
SW
0.000%
0.187%
0.000%
12.594%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
8.095%
0.748%
43.269%
0.000%
0.000%
0.000%
0.000%
0.000%
0.146%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.578%
0.000%
0.000%
0.000%
0.000%
0.377%
0.000%
2.274%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A31c. Dinoseb — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 7 ug/L
Total
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5
GW
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 7 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.787%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.118%
0.000%
0.000%
0.271%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.015%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.797%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.127%
0.000%
0.000%
0.275%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.017%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 7 ug/L
Total
0
0
0
0
0
0
0
175
0
0
0
0
0
0
0
0
0
0
0
0
0
111
0
0
25,926
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
26,212
GW
0
0
0
0
0
0
0
175
0
0
0
0
0
0
0
0
0
0
0
0
0
111
0
0
25,926
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
26,212
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 7 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.028%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.015%
0.000%
0.000%
1.782%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.014%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.051%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.030%
0.000%
0.000%
3.823%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.039%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A31d. Dinoseb — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 3.5 ug/L
Total
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6
GW
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 3.5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.787%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.118%
0.000%
0.000%
0.406%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.018%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.797%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.127%
0.000%
0.000%
0.412%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.020%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 3.5 ug/L
Total
0
0
0
0
0
0
0
175
0
0
0
0
0
0
0
0
0
0
0
0
0
111
0
0
26,006
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
26,292
GW
0
0
0
0
0
0
0
175
0
0
0
0
0
0
0
0
0
0
0
0
0
111
0
0
26,006
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
26,292
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 3.5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.028%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.015%
0.000%
0.000%
1.788%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.014%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.051%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.030%
0.000%
0.000%
3.835%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.040%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A32. Diquat — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 20 ug/L
> 10 ug/L
> 20 ug/L
> 10 ug/L
> 20 ug/L
> 10 ug/L
Total # Systems
Reporting
14,021
14,021
1,574
1,574
15,595
15,595
# Systems Exceeding
Threshold of Interest
0
0
0
2
0
2
% Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.127%
0.000%
0.013%
Total Pop. Served by
Systems Reporting
45,472,880
45,472,880
75,149,767
75,149,767
120,622,647
120,622,647
Total Pop. Served by
Systems Exceeding
Threshold of Interest
0
0
0
68,095
0
68,095
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.091%
0.000%
0.056%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A32a. Diquat — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
35
644
1,568
6,308
11,609
2,319
1,296
3
2,352
1,426
46
1,248
4,655
2,244
1,700
8
171
29
38
923
62
1,529
1
4,018
1,529
83
562
2,064
4
2,922
799
56
28
128
13
3,162
7
45
55,634
GW
17
452
1,329
4,928
6,863
1,653
988
0
2,288
1,353
30
1,034
3,950
2,081
434
2
12
21
21
833
39
1,477
1
3,786
1,132
11
411
1,580
4
2,552
689
10
25
64
12
3,070
3
30
43,185
SW
18
192
239
1,380
4,746
666
308
3
64
73
16
214
705
163
1,266
6
159
8
17
90
23
52
0
232
397
72
151
484
0
370
110
46
3
64
1
92
4
15
12,449
Percent of Samples
with Detections
Total
0.000%
0.466%
0.064%
0.333%
0.069%
0.216%
0.000%
0.000%
0.553%
0.000%
0.000%
0.000%
0.000%
0.134%
0.529%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.131%
0.000%
0.199%
0.523%
0.000%
0.534%
0.145%
0.000%
0.240%
0.000%
0.000%
3.571%
0.781%
0.000%
0.000%
14.286%
0.000%
0.174%
GW
0.000%
0.442%
0.000%
0.386%
0.058%
0.242%
0.000%
0.568%
0.000%
0.000%
0.000%
0.000%
0.144%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.068%
0.000%
0.185%
0.618%
0.000%
0.730%
0.190%
0.000%
0.235%
0.000%
0.000%
4.000%
1.563%
0.000%
0.000%
0.000%
0.000%
0.171%
SW
0.000%
0.521%
0.418%
0.145%
0.084%
0.150%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.711%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.923%
0.431%
0.252%
0.000%
0.000%
0.000%
0.270%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
25.000%
0.000%
0.185%
Minimum Detect
Concentration (u.g/L)
Total
2.2
2
0.4
0.08
0.5
0.35
0.4
0.4
0.9
0.17
0.55
1.11
0.5
4.45
8.8
5
5
0.08
GW
2.2
0.4
4.6
0.5
0.35
0.4
1.08
0.17
0.55
1.11
0.5
4.45
8.8
5
0.17
SW
3.1
2
0.41
0.08
1
0.4
0.9
0.61
0.8
4.7
5
0.08
Median Detect
Concentration (u.g/L)
Total
3.1
2
0.6
4.75
1
0.4
0.6
5
0.99
0.605
0.785
1.27
0.8
6.5
8.8
5
5
0.8
GW
4.575
0.6
5.55
0.95
0.4
0.6
1.08
0.6
0.77
1.27
0.8
6.5
8.8
5
0.75
SW
3.1
2
0.41
4
1
5
0.9
0.61
0.8
4.7
5
2
90th Percentile Detect
Concentration (u.g/L)
Total
6.95
2
0.99
6.9
2.2
0.44
1.2
13
1.08
3.2
0.98
2.32
9
6.5
8.8
5
5
6.5
GW
6.95
0.99
6.6
2.2
0.44
1.2
1.08
3.2
0.98
2.32
9
6.5
8.8
5
6.5
SW
3.1
2
0.41
6.9
1
13
0.9
0.61
0.8
4.7
5
6.9
Maximum Detect
Concentration (u.g/L)
Total
6.95
2
0.99
6.9
2.2
1.6
1.2
13
1.08
3.2
0.98
2.32
9
6.5
8.8
5
5
13
GW
6.95
0.99
6.6
2.2
1.6
1.2
1.08
3.2
0.98
2.32
9
6.5
8.8
5
9
SW
3.1
2
0.41
6.9
1
13
0.9
0.61
0.8
4.7
5
13
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A32b. Diquat — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
10
182
453
900
1,349
786
647
1
1,309
296
3
562
1,148
1,403
243
3
19
13
19
605
28
736
1
672
287
18
271
1,083
4
773
248
10
7
61
13
1,407
7
18
15,595
GW
8
131
381
852
1,078
569
610
0
1,288
283
2
535
1,048
1,359
93
2
9
10
10
557
22
725
1
637
266
9
192
933
4
714
111
5
6
39
12
1,387
3
14
14,021
SW
2
51
72
48
271
217
37
1
21
13
1
27
100
44
150
1
10
3
9
48
6
11
0
35
21
9
79
150
0
59
21
5
1
22
1
20
4
4
1,574
Total Population Served by Systems
Reporting
Total
30,714
2,870,462
2,453,233
6,013,434
32,447,651
4,975,162
2,587,527
140,000
16,785,435
994,603
162,167
871,773
9,101,501
4,866,756
4,612,320
66,881
3,576,031
19,662
3,638,739
685,741
47,665
1,456,096
2,061
1,650,247
960,007
504,517
6,470,841
2,937,422
38,550
3,436,709
614,853
645,419
59,585
735,027
77,002
3,883,613
13,887
189,354
120,622,647
GW
21,750
617,869
910,207
2,642,843
11,747,715
508,528
260,260
0
14,546,259
305,252
27,550
653,881
2,906,279
2,547,020
375,460
29,266
15,750
8,862
29,588
309,762
40,636
679,616
2,061
1,389,574
270,116
19,962
488,501
572,672
38,550
809,926
255,682
144,562
54,185
31,616
8,079
2,191,869
8,605
2,567
45,472,880
SW
8,964
2,252,593
1,543,026
3,370,591
20,699,936
4,466,634
2,327,267
140,000
2,239,176
689,351
134,617
217,892
6,195,222
2,319,736
4,236,860
37,615
3,560,281
10,800
3,609,151
375,979
7,029
776,480
0
260,673
689,891
484,555
5,982,340
2,364,750
0
2,626,783
359,171
500,857
5,400
703,411
68,923
1,691,744
5,282
186,787
75,149,767
Percent of Systems
with At Least One Detection
Total
0.000%
1.648%
0.221%
1.222%
0.297%
0.636%
0.000%
0.000%
0.535%
0.000%
0.000%
0.000%
0.000%
0.214%
2.881%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.272%
0.000%
1.042%
2.439%
0.000%
1.107%
0.185%
0.000%
0.517%
0.000%
0.000%
14.286%
1.639%
0.000%
0.000%
14.286%
0.000%
0.442%
GW
0.000%
1.527%
0.000%
1.174%
0.093%
0.703%
0.000%
0.543%
0.000%
0.000%
0.000%
0.000%
0.221%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.138%
0.000%
0.942%
2.256%
0.000%
1.563%
0.214%
0.000%
0.420%
0.000%
0.000%
16.667%
2.564%
0.000%
0.000%
0.000%
0.000%
0.357%
SW
0.000%
1.961%
1.389%
2.083%
1.107%
0.461%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.667%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
9.091%
2.857%
4.762%
0.000%
0.000%
0.000%
1.695%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
25.000%
0.000%
1.207%
Percent of Population Served
with At Least One Detection
Total
0.000%
1.459%
0.407%
4.339%
13.165%
0.273%
0.000%
0.000%
15.701%
0.000%
0.000%
0.000%
0.000%
0.012%
15.878%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
35.791%
0.000%
0.680%
1.105%
0.000%
0.100%
1.042%
0.000%
0.309%
0.000%
0.000%
0.050%
0.082%
0.000%
0.000%
3.593%
0.000%
7.095%
GW
0.000%
4.717%
0.000%
5.163%
0.459%
0.269%
0.000%
18.118%
0.000%
0.000%
0.000%
0.000%
0.024%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.322%
0.000%
0.765%
3.466%
0.000%
1.330%
5.343%
0.000%
0.034%
0.000%
0.000%
0.055%
1.898%
0.000%
0.000%
0.000%
0.000%
6.430%
SW
0.000%
0.565%
0.648%
3.694%
20.376%
0.273%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
17.285%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
65.960%
0.227%
0.180%
0.000%
0.000%
0.000%
0.394%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
9.447%
0.000%
7.498%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A32c. Diquat — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 20 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 20 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 20 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 20 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A32d. Diquat — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 10 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
Percent of Systems
with At Least One Detection
> 10 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.823%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.013%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.333%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.127%
Population Served by Systems
with At Least One Detection
> 10 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
68,095
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
68,095
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
68,095
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
68,095
Percent of Population Served
with At Least One Detection
> 10 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.476%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.056%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.607%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.091%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A33. Endothall — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 100 ug/L
> 50 ug/L
> 100 ug/L
> 50 ug/L
> 100 ug/L
> 50 ug/L
Total # Systems
Reporting
12,632
12,632
1,524
1,524
14,156
14,156
# Systems Exceeding
Threshold of Interest
1
1
2
3
3
4
% Systems Exceeding
Threshold of Interest
0.008%
0.008%
0.131%
0.197%
0.021%
0.028%
Total Pop. Served by
Systems Reporting
44,124,258
44,124,258
74,412,543
74,412,543
118,536,801
118,536,801
Total Pop. Served by
Systems Exceeding
Threshold of Interest
20,000
20,000
54,657
66,657
74,657
86,657
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.045%
0.045%
0.073%
0.090%
0.063%
0.073%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A33a. Endothall — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
28
530
1,522
6,194
9,998
2,310
22
3
2,355
1,427
47
1,248
3,014
2,235
1,716
10
168
11
35
924
56
35
1
4,065
1,529
83
775
2,105
375
2,929
753
56
26
3
12
3,169
5
46
49,820
GW
10
371
1,305
4,789
5,748
1,648
16
0
2,289
1,354
30
1,035
2,627
2,074
442
4
11
7
21
834
38
13
1
3,829
1,139
7
588
1,618
231
2,533
643
10
25
1
11
3,078
3
31
38,414
SW
18
159
217
1,405
4,250
662
6
3
66
73
17
213
387
161
1,274
6
157
4
14
90
18
22
0
236
390
76
187
487
144
396
110
46
1
2
1
91
2
15
11,406
Percent of Samples
with Detections
Total
0.000%
0.000%
0.000%
0.097%
0.070%
0.087%
0.000%
0.000%
0.722%
0.070%
0.000%
0.000%
0.000%
0.045%
0.466%
0.000%
0.595%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.196%
0.000%
0.000%
0.048%
0.000%
0.000%
0.000%
0.000%
3.846%
0.000%
0.000%
0.000%
0.000%
0.000%
0.096%
GW
0.000%
0.000%
0.000%
0.104%
0.052%
0.121%
0.000%
0.000%
0.699%
0.074%
0.000%
0.000%
0.000%
0.048%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.088%
0.000%
0.000%
0.062%
0.000%
0.000%
0.000%
0.000%
4.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.081%
SW
0.000%
0.000%
0.000%
0.071%
0.094%
0.000%
0.000%
0.000%
1.515%
0.000%
0.000%
0.000%
0.000%
0.000%
0.628%
0.000%
0.637%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.513%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.149%
Minimum Detect
Concentration (u.g/L)
Total
9
5
5.8
1.5
13.6
14
0.1
0.21
5
45
9.9
0.1
GW
9
5
5.8
1.5
13.6
14
5
45
9.9
1.5
SW
9
55
4.4
0.1
0.21
9
0.1
Median Detect
Concentration (u.g/L)
Total
9
154.2
5.8
11.5
13.6
14
7.35
0.21
9
45
9.9
9.8
GW
9
5
5.8
11.5
13.6
14
5
45
9.9
11.5
SW
9
162.7
4.4
7.35
0.21
9
9
90th Percentile Detect
Concentration (u.g/L)
Total
9
548.1
5.8
11.5
13.6
14
10
0.21
9
45
9.9
55
GW
9
450
5.8
11.5
13.6
14
5
45
9.9
13.6
SW
9
548.1
4.4
10
0.21
9
171.2
Maximum Detect
Concentration (u.g/L)
Total
9
548.1
5.8
11.5
13.6
14
10
0.21
9
45
9.9
548.1
GW
9
450
5.8
11.5
13.6
14
5
45
9.9
450
SW
9
548.1
4.4
10
0.21
9
548.1
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A33b. Endothall — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
6
172
454
910
1,255
787
19
1
1,308
296
3
565
1,148
1,402
243
5
17
7
18
606
28
18
1
671
288
18
292
1,081
47
781
247
10
8
2
12
1,406
5
19
14,156
GW
4
126
382
862
979
570
16
0
1,287
283
2
538
1,048
1,358
93
4
8
4
11
558
22
8
1
637
267
6
214
931
38
721
226
5
7
1
11
1,386
3
15
12,632
SW
2
46
72
48
276
217
3
1
21
13
1
27
100
44
150
1
9
3
7
48
6
10
0
34
21
12
78
150
9
60
21
5
1
1
1
20
2
4
1,524
Total Population Served by Systems
Reporting
Total
22,245
3,363,471
2,453,348
6,050,529
32,564,499
4,975,562
154,122
140,000
16,750,864
994,603
162,167
871,868
9,104,311
4,866,706
4,612,320
67,041
3,563,515
19,558
3,597,572
685,991
47,665
791,975
2,061
1,654,483
960,447
548,606
6,543,054
2,938,337
889,968
3,460,504
600,752
645,419
257,795
5,726
76,640
3,883,588
11,455
198,034
118,536,801
GW
13,281
589,449
910,322
2,679,938
11,127,358
508,928
3,675
0
14,511,688
305,252
27,550
653,976
2,909,089
2,546,970
375,460
29,426
4,750
9,484
29,838
310,012
40,636
15,888
2,061
1,393,835
270,556
17,893
568,814
573,587
149,990
832,811
241,581
144,562
105,535
650
7,717
2,191,844
8,605
11,247
44,124,258
SW
8,964
2,774,022
1,543,026
3,370,591
21,437,141
4,466,634
150,447
140,000
2,239,176
689,351
134,617
217,892
6,195,222
2,319,736
4,236,860
37,615
3,558,765
10,074
3,567,734
375,979
7,029
776,087
0
260,648
689,891
530,713
5,974,240
2,364,750
739,978
2,627,693
359,171
500,857
152,260
5,076
68,923
1,691,744
2,850
186,787
74,412,543
Percent of Systems
with At Least One Detection
Total
0.000%
0.000%
0.000%
0.330%
0.398%
0.127%
0.000%
0.000%
0.841%
0.338%
0.000%
0.000%
0.000%
0.071%
2.469%
0.000%
5.882%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.694%
0.000%
0.000%
0.093%
0.000%
0.000%
0.000%
0.000%
12.500%
0.000%
0.000%
0.000%
0.000%
0.000%
0.233%
GW
0.000%
0.000%
0.000%
0.232%
0.204%
0.175%
0.000%
0.000%
0.777%
0.353%
0.000%
0.000%
0.000%
0.074%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.375%
0.000%
0.000%
0.107%
0.000%
0.000%
0.000%
0.000%
14.286%
0.000%
0.000%
0.000%
0.000%
0.000%
0.158%
SW
0.000%
0.000%
0.000%
2.083%
1.087%
0.000%
0.000%
0.000%
4.762%
0.000%
0.000%
0.000%
0.000%
0.000%
4.000%
0.000%
11.111%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.762%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.853%
Percent of Population Served
with At Least One Detection
Total
0.000%
0.000%
0.000%
5.796%
0.271%
0.001%
0.000%
0.000%
19.027%
2.852%
0.000%
0.000%
0.000%
0.003%
8.989%
0.000%
47.986%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
34.830%
0.000%
0.000%
0.010%
0.000%
0.000%
0.000%
0.000%
0.012%
0.000%
0.000%
0.000%
0.000%
0.000%
5.158%
GW
0.000%
0.000%
0.000%
1.890%
0.195%
0.012%
0.000%
0.000%
21.261%
9.292%
0.000%
0.000%
0.000%
0.006%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.055%
0.000%
0.000%
0.052%
0.000%
0.000%
0.000%
0.000%
0.028%
0.000%
0.000%
0.000%
0.000%
0.000%
7.222%
SW
0.000%
0.000%
0.000%
8.901%
0.311%
0.000%
0.000%
0.000%
4.550%
0.000%
0.000%
0.000%
0.000%
0.000%
9.785%
0.000%
48.050%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
48.467%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.934%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A33c. Endothall — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 100 ug/L
Total
0
0
0
0
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3
GW
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
sw
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
Percent of Systems
with At Least One Detection
> 100 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.239%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.021%
GW
0.000%
0.000%
0.000%
0.000%
0.102%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.008%
sw
0.000%
0.000%
0.000%
0.000%
0.725%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.131%
Population Served by Systems
with At Least One Detection
> 100 ug/L
Total
0
0
0
0
74,657
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
74,657
GW
0
0
0
0
20,000
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
20,000
sw
0
0
0
0
54,657
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
54,657
Percent of Population Served
with At Least One Detection
> 100 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.229%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.063%
GW
0.000%
0.000%
0.000%
0.000%
0.180%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.045%
sw
0.000%
0.000%
0.000%
0.000%
0.255%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.073%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A33d. Endothall — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 50 ug/L
Total
0
0
0
0
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4
GW
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
sw
0
0
0
0
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3
Percent of Systems
with At Least One Detection
> 50 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.319%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.028%
GW
0.000%
0.000%
0.000%
0.000%
0.102%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.008%
sw
0.000%
0.000%
0.000%
0.000%
1.087%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.197%
Population Served by Systems
with At Least One Detection
> 50 ug/L
Total
0
0
0
0
86,657
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
86,657
GW
0
0
0
0
20,000
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
20,000
sw
0
0
0
0
66,657
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
66,657
Percent of Population Served
with At Least One Detection
> 50 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.266%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.073%
GW
0.000%
0.000%
0.000%
0.000%
0.180%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.045%
sw
0.000%
0.000%
0.000%
0.000%
0.311%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.090%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A34. Endrin — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 2 ug/L
> 1 ug/L
> 2 ug/L
> 1 ug/L
> 2 ug/L
> 1 ug/L
Total # Systems
Reporting
29,734
29,734
3,049
3,049
32,783
32,783
# Systems Exceeding
Threshold of Interest
1
2
0
0
1
2
% Systems Exceeding
Threshold of Interest
0.003%
0.007%
0.000%
0.000%
0.003%
0.006%
Total Pop. Served by
Systems Reporting
67,885,419
67,885,419
116,157,743
116,157,743
184,043,162
184,043,162
Total Pop. Served by
Systems Exceeding
Threshold of Interest
300
2,800
0
0
300
2,800
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.004%
0.000%
0.000%
0.000%
0.002%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A34a. Endrin — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
104
548
1,664
7,257
14,264
2,525
1,584
758
2,396
1,482
2,101
148
1,742
3,866
2,233
1,759
3,015
2,741
458
6,768
4,761
5,560
3,006
13,597
410
4,480
4,193
35
4,357
1,643
2,947
234
2,054
601
2,966
953
65
11,038
7,091
506
1,310
3,187
646
1,283
134,336
GW
53
402
1,423
5,687
8,235
1,825
1,006
729
2,329
1,402
2,004
131
1,484
3,129
2,069
446
2,227
1,725
404
6,317
4,620
4,692
2,698
12,464
344
4,131
3,874
31
4,107
1,207
2,205
98
1,571
414
2,572
844
12
5,279
5,907
178
1,108
3,094
336
964
105,777
SW
51
146
241
1,570
6,029
700
578
29
67
80
97
17
258
737
164
1,313
788
1,016
54
451
141
868
308
1,133
66
349
319
4
250
436
742
136
483
187
394
109
53
5,759
1,184
328
202
93
310
319
28,559
Percent of Samples
with Detections
Total
0.000%
0.000%
0.000%
0.000%
0.035%
0.000%
0.442%
0.000%
0.459%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.341%
0.100%
0.292%
0.000%
0.000%
0.000%
0.036%
0.000%
0.066%
0.488%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.333%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.076%
0.031%
2.167%
0.000%
0.053%
GW
0.000%
0.000%
0.000%
0.000%
0.061%
0.000%
0.000%
0.000%
0.472%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.043%
0.000%
0.064%
0.581%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.483%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.090%
0.032%
2.679%
0.000%
0.039%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.211%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.457%
0.381%
0.787%
0.000%
0.000%
0.000%
0.000%
0.000%
0.088%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.613%
0.000%
0.105%
Minimum Detect
Concentration (u.g/L)
Total
0.007
0.01
0.008
0.001
0.01
0.03
0.11
0.01
0.02
0.005
0.1
0.05
0.0025
0.001
GW
0.007
0.008
0.11
0.01
0.02
0.005
0.1
0.05
0.0025
0.0025
SW
0.01
0.001
0.01
0.03
0.04
0.0035
0.001
Median Detect
Concentration (u.g/L)
Total
1.7
0.1
0.008
0.3
0.01
0.06
0.125
0.01
0.075
0.005
0.1
0.05
0.0035
0.02
GW
1.7
0.008
0.125
0.01
0.075
0.005
0.1
0.05
0.0035
0.008
SW
0.1
0.3
0.01
0.06
0.04
0.01
0.07
90th Percentile Detect
Concentration (u.g/L)
Total
3.3
0.1
0.008
0.5
0.01
0.52
0.14
0.08
0.13
0.005
0.1
0.05
0.5
0.5
GW
3.3
0.008
0.14
0.08
0.13
0.005
0.1
0.05
0.5
0.14
SW
0.1
0.5
0.01
0.52
0.04
0.5
0.5
Maximum Detect
Concentration (u.g/L)
Total
3.3
0.1
0.008
0.5
0.01
0.52
0.14
0.08
0.13
0.005
0.1
0.05
0.5
3.3
GW
3.3
0.008
0.14
0.08
0.13
0.005
0.1
0.05
0.5
3.3
SW
0.1
0.5
0.01
0.52
0.04
0.5
0.52
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A34b. Endrin —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
16
181
450
949
1,627
808
655
201
1,315
297
112
95
722
1,132
1,401
243
644
862
263
2,930
1,287
1,471
813
2,365
208
762
1,237
31
695
291
1,348
46
1,084
86
773
261
12
2,002
426
183
442
1,410
343
304
32,783
GW
10
133
379
901
1,333
589
617
198
1,294
283
100
93
675
1,031
1,357
93
527
794
238
2,869
1,258
1,395
753
2,228
181
751
1,196
29
659
270
1,117
36
934
77
714
240
6
1,665
389
71
409
1,390
196
256
29,734
SW
6
48
71
48
294
219
38
3
21
14
12
2
47
101
44
150
117
68
25
61
29
76
60
137
27
11
41
2
36
21
231
10
150
9
59
21
6
337
37
112
33
20
147
48
3,049
Total Population Served by Systems
Reporting
Total
246,416
2,794,663
2,447,627
6,081,248
33,812,994
4,990,621
2,595,773
628,982
16,791,489
997,274
1,305,882
238,934
978,730
9,103,070
4,866,676
4,612,320
8,485,298
4,906,096
487,341
7,226,540
3,934,332
2,644,644
753,259
6,885,177
559,142
1,455,834
945,754
1,076,429
1,662,962
960,972
4,924,821
3,537,892
2,937,104
902,061
3,427,802
622,272
655,614
21,523,196
2,500,386
2,403,715
432,910
3,883,918
1,368,815
446,177
184,043,162
GW
14,306
636,554
905,863
2,710,657
12,091,504
523,712
261,886
347,582
14,552,313
305,252
1,251,254
99,549
742,054
2,907,148
2,546,940
375,460
1,682,916
907,989
116,684
2,046,684
2,684,691
1,700,183
360,590
1,733,551
253,917
679,354
395,955
142,635
1,400,064
271,081
981,544
147,360
572,354
162,083
801,019
263,101
145,112
5,759,696
1,667,200
30,317
181,746
2,192,174
204,156
129,229
67,885,419
SW
232,110
2,158,109
1,541,764
3,370,591
21,721,490
4,466,909
2,333,887
281,400
2,239,176
692,022
54,628
139,385
236,676
6,195,922
2,319,736
4,236,860
6,802,382
3,998,107
370,657
5,179,856
1,249,641
944,461
392,669
5,151,626
305,225
776,480
549,799
933,794
262,898
689,891
3,943,277
3,390,532
2,364,750
739,978
2,626,783
359,171
510,502
15,763,500
833,186
2,373,398
251,164
1,691,744
1,164,659
316,948
116,157,743
Percent of Systems
with At Least One Detection
Total
0.000%
0.000%
0.000%
0.000%
0.246%
0.000%
0.611%
0.000%
0.380%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.646%
0.311%
0.348%
0.000%
0.000%
0.000%
0.068%
0.000%
0.296%
0.962%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.163%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.226%
0.071%
3.499%
0.000%
0.143%
GW
0.000%
0.000%
0.000%
0.000%
0.300%
0.000%
0.000%
0.000%
0.386%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.269%
1.105%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.299%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.244%
0.072%
4.592%
0.000%
0.101%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
10.526%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.667%
1.709%
4.412%
0.000%
0.000%
0.000%
0.000%
0.000%
0.730%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.041%
0.000%
0.558%
Percent of Population Served
with At Least One Detection
Total
0.000%
0.000%
0.000%
0.000%
0.156%
0.000%
17.130%
0.000%
15.509%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
7.137%
0.870%
69.819%
0.000%
0.000%
0.000%
0.004%
0.000%
0.135%
0.091%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.022%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.071%
0.001%
0.829%
0.000%
3.777%
GW
0.000%
0.000%
0.000%
0.000%
0.437%
0.000%
0.000%
0.000%
17.895%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.006%
0.000%
0.347%
0.200%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.123%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.169%
0.002%
0.971%
0.000%
3.927%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
19.052%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
7.769%
1.086%
85.675%
0.000%
0.000%
0.000%
0.000%
0.000%
0.064%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.804%
0.000%
3.690%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A34c. Endrin — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2 ug/L
Total
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
GW
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 2 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.061%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
GW
0.000%
0.000%
0.000%
0.000%
0.075%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 2 ug/L
Total
0
0
0
0
300
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
300
GW
0
0
0
0
300
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
300
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 2 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A34d. Endrin —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 1 ug/L
Total
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
GW
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
>lug/L
Total
0.000%
0.000%
0.000%
0.000%
0.123%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.006%
GW
0.000%
0.000%
0.000%
0.000%
0.150%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
>lug/L
Total
0
0
0
0
2,800
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2,800
GW
0
0
0
0
2,800
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2,800
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
>lug/L
Total
0.000%
0.000%
0.000%
0.000%
0.008%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
GW
0.000%
0.000%
0.000%
0.000%
0.023%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A35. Ethylbenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 700 ug/L
> 350 ug/L
> 700 ug/L
> 350 ug/L
> 700 ug/L
> 350 ug/L
Total # Systems
Reporting
46,190
46,190
4,257
4,257
50,447
50,447
# Systems Exceeding
Threshold of Interest
0
2
0
0
0
2
% Systems Exceeding
Threshold of Interest
0.000%
0.004%
0.000%
0.000%
0.000%
0.004%
Total Pop. Served by
Systems Reporting
86,398,177
86,398,177
140,541,198
140,541,198
226,939,375
226,939,375
Total Pop. Served by
Systems Exceeding
Threshold of Interest
0
5,961
0
0
0
5,961
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.007%
0.000%
0.000%
0.000%
0.003%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A35a. Ethylbenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,385
849
2,394
11,711
86,361
2,910
6,944
1,051
4,190
7,175
1,790
1,942
3,740
7,071
4,621
3,311
16,249
6,774
3,702
10,752
8,620
7,543
4,493
19,062
568
6,840
9,583
20,327
6,572
3,210
7,140
8,848
5,355
2,328
1,959
4,342
889
2,935
34,219
8,990
4,930
4,357
11,297
1,149
1,663
374,141
GW
2,220
622
1,926
9,547
45,803
2,154
6,053
1,021
4,122
6,348
1,687
1,811
3,279
6,511
4,311
1,127
12,259
5,512
3,383
9,742
7,363
6,694
3,954
17,483
432
6,264
9,105
18,543
6,097
2,578
5,465
7,688
3,958
1,685
1,591
3,805
855
1,163
27,101
7,559
4,057
3,963
11,173
449
1,159
289,622
SW
1,165
227
468
2,164
40,558
756
891
30
68
827
103
131
461
560
310
2,184
3,990
1,262
319
1,010
1,257
849
539
1,579
136
576
478
1,784
475
632
1,675
1,160
1,397
643
368
537
34
1,772
7,118
1,431
873
394
124
700
504
84,519
Percent of Samples
with Detections
Total
3.663%
4.594%
3.133%
1.272%
0.076%
2.474%
0.403%
1.903%
2.411%
1.519%
0.000%
3.038%
0.107%
1.542%
0.346%
1.268%
0.302%
1.491%
0.378%
0.419%
2.378%
1.180%
0.690%
3.200%
1.937%
0.102%
0.292%
0.497%
0.700%
0.405%
0.756%
0.972%
1.737%
0.301%
0.306%
0.599%
0.225%
0.102%
2.686%
0.178%
2.535%
0.230%
0.894%
2.089%
1.022%
1.030%
GW
1.532%
5.627%
3.738%
1.288%
0.079%
2.228%
0.463%
1.959%
2.450%
1.670%
0.000%
2.982%
0.091%
1.659%
0.348%
1.154%
0.302%
1.796%
0.236%
0.328%
1.779%
1.285%
0.632%
3.443%
2.546%
0.112%
0.308%
0.518%
0.689%
0.388%
0.732%
1.067%
1.920%
0.119%
0.189%
0.657%
0.234%
0.086%
3.000%
0.132%
2.835%
0.202%
0.904%
3.563%
1.381%
1.146%
SW
7.725%
1.762%
0.641%
1.201%
0.074%
3.175%
0.000%
0.000%
0.000%
0.363%
0.000%
3.817%
0.217%
0.179%
0.323%
1.328%
0.301%
0.158%
1.881%
1.287%
5.887%
0.353%
1.113%
0.507%
0.000%
0.000%
0.000%
0.280%
0.842%
0.475%
0.836%
0.345%
1.217%
0.778%
0.815%
0.186%
0.000%
0.113%
1.489%
0.419%
1.145%
0.508%
0.000%
1.143%
0.198%
0.629%
Minimum Detect
Concentration (u.g/L)
Total
0.1
0.5
0.11
0.5
0.5
0.08
0.6
0.51
0.06
0.5
0.1
0.3
0.5
0.6
0.002
0.5
0.1
0.5
0.5
0.2
0.5
0.54
0.5
0.54
0.96
0.38
0.1
0.12
0.7
0.5
0.5
0.3
0.5
2
0.1
0.21
0.5
0.5
0.6
0.5
0.2
0.02
0.09
0.3
0.002
GW
0.1
0.5
0.11
0.5
0.5
0.08
0.6
0.51
0.06
0.5
0.1
0.3
0.5
0.6
0.2
0.5
0.1
0.5
0.5
0.2
0.5
0.54
0.5
0.54
0.96
0.38
0.1
0.12
0.7
0.5
0.5
0.3
0.5
2
0.1
0.21
0.8
0.5
0.6
0.5
0.2
0.02
0.09
0.43
0.02
SW
0.22
0.5
0.2
0.5
0.52
0.3
0.53
0.6
1.5
0.53
0.97
0.002
0.52
0.8
0.5
0.5
0.2
0.5
0.66
0.5
0.2
0.17
1.65
0.5
0.52
0.5
0.5
4.2
1.67
0.5
0.5
1.2
0.5
3.4
0.4
0.3
0.002
Median Detect
Concentration (u.g/L)
Total
1.205
0.97
0.62
1
0.975
0.88
1.2
2.84
0.81
0.88
0.9
1.165
0.8
0.9
0.6
1.1
1.1
0.75
1
0.3
1
1.4
1.1
0.96
2.2
1
0.6
0.725
1.7
0.95
1.5
1
0.51
3.35
1
0.28
0.56
1
2.8
1.2
1.85
0.31
0.5
0.7
0.9
GW
0.655
0.97
0.635
1
0.7
0.82
1.2
2.84
0.81
0.875
0.85
0.83
0.8
0.9
0.8
1
1.2
0.65
0.9
0.4
1
1.8
1.1
0.96
2.2
1
0.6
0.795
2.05
0.9
1.505
0.95
0.6
2.5
1
0.28
0.8
1
4.3
1.1
1.25
0.31
0.5
0.705
0.9
SW
2.175
0.95
0.61
1
1.165
1.1
1
0.9
1.5
0.53
0.97
0.5
1.495
0.8
0.95
1.3
0.3
1.72
1.3
0.925
0.5
0.3
1.65
0.95
0.7
1
0.51
4.29
1.67
0.53
0.965
1.4
1.55
3.9
0.6
0.3
0.9
90th Percentile Detect
Concentration (u.g/L)
Total
47.4
8.99
2.11
3.3
11.8
10
5.4
23.4
3.1
3.2
3.6
1.6
2.22
3.9
2.4
2.7
3.9
6.7
3.2
1.4
3.3
6
6.2
2.59
5.3
10
3
4.4
5.8
5
6.74
4.3
1.1
7.9
3.17
0.35
0.8
4.4
9
4.8
4.7
2.5
1
3
4.6
GW
2.21
8.99
2.11
2.5
12
17
5.4
23.4
3.1
3.2
2.5
1.6
2.22
3.9
8.2
1.9
4
8.5
3.2
1.4
2.96
6
6.2
2.59
5.3
10
3
4.4
9.25
5.3
6.74
5.2
0.7
2.5
3.17
0.35
0.8
5.1
9
4.3
5
2.5
0.6
3
4.4
SW
66.3
4.1
0.75
6.1
10.55
2.7
1.1
7.2
1.5
0.53
0.97
1
3.12
0.8
1.5
2.6
1.4
3.88
1.6
5.19
0.9
0.68
2.16
1.93
2
2.57
1.1
7.9
1.67
0.56
3.1
85
7.45
4.4
1.4
0.3
6
Maximum Detect
Concentration (u.g/L)
Total
97.5
25.6
6.62
66
21
63
9.4
52.8
250
10
7.2
1.6
12.5
9.7
14
33
13.7
8.5
13.3
29
42.5
17.9
557
39
5.3
24
72
15.9
12.7
12
105
23.3
1.1
7.9
6.61
0.35
0.8
386.07
85
64
5
340
1.4
3.9
557
GW
15
25.6
6.62
35
21
63
9.4
52.8
250
10
6.6
1.6
12.5
9.7
14
6
13.7
8.5
13.3
29
42.5
17.9
557
39
5.3
24
72
15.9
12.7
11.2
105
23.3
0.7
2.5
6.61
0.35
0.8
386.07
9
64
5
340
0.8
3.9
557
SW
97.5
4.1
0.75
66
18.6
3.5
1.1
7.2
1.5
0.53
0.97
3
33
0.8
1.5
3.2
15
3.88
1.6
5.19
0.9
0.68
2.16
12
2
4.5
1.1
7.9
1.67
0.56
8.1
85
9.1
4.4
1.4
0.3
97.5
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A35b. Ethylbenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
264
454
1,059
3,661
827
1,207
318
1,513
1,822
106
1,057
935
1,429
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
210
771
1,258
1,398
727
338
1,526
1,944
718
1,097
145
819
245
351
4,951
500
1,600
603
1,784
403
304
50,447
GW
474
203
382
1,011
3,144
606
1,168
315
1,487
1,706
94
1,024
878
1,325
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
183
760
1,217
1,361
688
317
1,290
1,819
506
945
136
757
233
162
4,609
454
1,429
560
1,764
243
256
46,190
SW
146
61
72
48
517
221
39
3
26
116
12
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
171
43
20
160
48
4,257
Total Population Served by Systems
Reporting
Total
606,193
4,219,181
2,453,348
6,166,873
35,830,513
4,997,906
2,723,376
698,987
17,497,981
7,485,298
1,293,745
2,543,315
1,093,666
9,217,431
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,748,495
1,698,980
973,592
4,895,109
10,227,597
3,119,686
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,273,258
491,035
4,039,526
1,416,020
446,177
226,939,375
GW
232,590
1,124,093
910,322
2,796,282
13,518,052
530,272
389,454
417,587
15,251,939
1,592,517
1,239,117
1,434,689
837,604
3,017,034
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,712,549
1,432,432
283,701
1,044,507
3,132,660
660,832
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
630,675
227,067
2,347,782
237,670
129,229
86,398,177
SW
373,603
3,095,088
1,543,026
3,370,591
22,312,461
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,642,583
263,968
1,691,744
1,178,350
316,948
140,541,198
Percent of Systems
with At Least One Detection
Total
5.806%
10.606%
7.489%
5.382%
1.120%
5.200%
0.829%
4.717%
3.106%
3.403%
0.000%
3.595%
0.428%
3.429%
0.543%
10.788%
3.482%
4.459%
0.988%
0.908%
7.080%
3.881%
1.061%
10.689%
2.857%
0.778%
1.351%
4.149%
3.301%
2.367%
2.556%
1.595%
5.432%
0.547%
3.448%
2.442%
0.408%
0.855%
10.402%
1.600%
3.375%
1.327%
3.083%
5.459%
4.276%
3.909%
GW
3.165%
12.315%
8.377%
4.847%
0.763%
5.776%
0.856%
4.762%
3.161%
3.517%
0.000%
3.320%
0.342%
3.623%
0.490%
8.696%
2.667%
4.564%
0.925%
0.687%
6.186%
3.881%
0.888%
11.176%
3.279%
0.789%
1.397%
4.115%
3.052%
1.893%
2.093%
1.649%
5.929%
0.212%
1.471%
2.510%
0.429%
0.617%
9.980%
1.322%
3.429%
1.250%
3.118%
6.173%
4.688%
3.750%
SW
14.384%
4.918%
2.778%
16.667%
3.288%
3.620%
0.000%
0.000%
0.000%
1.724%
0.000%
12.121%
1.754%
0.962%
2.273%
12.081%
7.627%
2.941%
1.887%
11.475%
53.333%
3.896%
3.333%
2.878%
0.000%
0.000%
0.000%
5.405%
7.692%
9.524%
5.085%
0.800%
4.245%
2.632%
33.333%
1.613%
0.000%
1.058%
16.082%
4.348%
2.924%
2.326%
0.000%
4.375%
2.083%
5.638%
Percent of Population Served
with At Least One Detection
Total
4.748%
6.592%
3.025%
52.627%
17.451%
1.829%
0.145%
16.911%
3.137%
2.981%
0.000%
1.917%
0.139%
1.333%
2.452%
13.326%
4.208%
1.377%
19.099%
51.990%
19.959%
3.753%
1.153%
6.380%
1.121%
0.502%
0.902%
3.992%
32.666%
1.577%
6.497%
0.155%
1.630%
0.228%
20.600%
1.410%
1.342%
0.770%
28.175%
8.073%
2.493%
0.622%
9.091%
3.093%
5.933%
11.857%
GW
5.660%
13.500%
6.791%
38.355%
4.104%
5.953%
1.016%
28.307%
3.598%
8.161%
0.000%
2.638%
0.119%
3.920%
4.660%
6.332%
9.722%
5.955%
0.739%
13.190%
20.810%
5.885%
1.876%
17.652%
2.452%
1.071%
2.144%
8.958%
37.712%
4.550%
2.627%
0.441%
4.409%
0.123%
24.496%
6.393%
1.840%
0.597%
33.148%
2.787%
10.486%
1.022%
15.642%
3.209%
2.809%
10.518%
SW
4.180%
4.082%
0.803%
64.466%
25.538%
1.339%
0.000%
0.000%
0.000%
1.581%
0.000%
0.984%
0.205%
0.074%
0.004%
13.947%
2.791%
0.203%
31.440%
66.805%
17.907%
1.012%
0.481%
2.670%
0.000%
0.000%
0.000%
1.317%
5.548%
0.354%
7.547%
0.028%
0.884%
0.253%
19.685%
0.019%
0.000%
0.830%
25.252%
18.586%
1.407%
0.278%
0.000%
3.070%
7.207%
12.681%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A35c. Ethylbenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 700 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 700 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 700 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 700 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A35d. Ethylbenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 350 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
2
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
2
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 350 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.042%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.020%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.045%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.022%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 350 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
45
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5,916
0
0
0
0
0
0
5,961
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
45
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5,916
0
0
0
0
0
0
5,961
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 350 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.024%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.064%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A36. Ethylene dibromide (EDB) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 0.05 ug/L
> 0.025 ug/L
> 0.05 ug/L
> 0.025 ug/L
> 0.05 ug/L
> 0.025 ug/L
Total # Systems
Reporting
33,245
33,245
2,970
2,970
36,215
36,215
# Systems Exceeding
Threshold of Interest
67
96
21
26
88
122
% Systems Exceeding
Threshold of Interest
0.202%
0.289%
0.707%
0.875%
0.243%
0.337%
Total Pop. Served by
Systems Reporting
72,299,607
72,299,607
115,854,308
115,854,308
188,153,915
188,153,915
Total Pop. Served by
Systems Exceeding
Threshold of Interest
449,648
1,143,149
1,810,412
1,894,232
2,260,060
3,037,381
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.622%
1.581%
1.563%
1.635%
1.201%
1.614%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A36a. Ethylene dibromide (EDB) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
1,457
652
4,115
6,234
48,322
2,576
1,500
2,273
2,438
8,860
3,057
85
1,793
3,942
2,271
1,724
3,022
2,194
5,362
8,585
7,543
1,196
12,730
70
9,184
4,043
19,718
942
2,386
478
43
2,048
2,253
3,243
1,492
53
34,144
11
446
1,387
2,909
685
1,331
218,797
GW
930
482
3,375
4,842
27,484
1,880
1,168
2,213
2,373
7,955
2,966
68
1,571
3,490
2,093
433
2,160
2,036
4,847
7,336
6,694
1,080
11,856
45
8,526
3,874
18,259
883
1,875
336
12
1,565
1,777
2,789
1,366
11
27,040
11
214
1,218
2,878
358
1,002
173,371
SW
527
170
740
1,392
20,838
696
332
60
65
905
91
17
222
452
178
1,291
862
158
515
1,249
849
116
874
25
658
169
1,459
59
511
142
31
483
476
454
126
42
7,104
0
232
169
31
327
329
45,426
Percent of Samples
with Detections
Total
0.000%
2.914%
0.122%
0.225%
2.038%
0.272%
1.000%
0.176%
0.738%
0.023%
0.262%
0.000%
0.279%
0.000%
0.088%
0.928%
0.232%
0.000%
0.000%
0.000%
0.000%
0.000%
0.479%
0.000%
0.327%
0.000%
0.036%
0.106%
0.042%
0.628%
0.000%
0.195%
0.000%
2.158%
0.000%
0.000%
0.000%
0.000%
0.000%
0.144%
0.413%
1.460%
0.075%
0.598%
GW
0.000%
2.697%
0.148%
0.186%
1.754%
0.319%
0.599%
0.181%
0.759%
0.025%
0.270%
0.000%
0.318%
0.000%
0.048%
0.000%
0.093%
0.000%
0.000%
0.000%
0.000%
0.000%
0.489%
0.000%
0.352%
0.000%
0.038%
0.113%
0.000%
0.595%
0.000%
0.256%
0.000%
2.331%
0.000%
0.000%
0.000%
0.000%
0.000%
0.164%
0.417%
1.955%
0.100%
0.433%
SW
0.000%
3.529%
0.000%
0.359%
2.414%
0.144%
2.410%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.562%
1.239%
0.580%
0.000%
0.000%
0.000%
0.000%
0.000%
0.343%
0.000%
0.000%
0.000%
0.000%
0.000%
0.196%
0.704%
0.000%
0.000%
0.000%
1.101%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.917%
0.000%
1.228%
Minimum Detect
Concentration (u.g/L)
Total
0.00139
0.00292
0.01
0.01
0.01
0.02
0.03
0.003
0.02
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.0017
0.01
0.02
0.00293
0.01
0.00329
0.005
0.01
0.0027
0.2
0.00139
GW
0.00139
0.00292
0.01
0.01
0.01
0.02
0.03
0.003
0.02
0.01
0.01
0.01
0.01
0.01
0.01
0.0017
0.01
0.00293
0.01
0.00329
0.005
0.01
0.0027
0.2
0.00139
SW
0.02
0.01
0.01
0.02
0.02
0.03
0.01
0.02
0.09
0.02
0.03
0.5
0.01
0.01
Median Detect
Concentration (u.g/L)
Total
0.17
0.02
0.01
0.04
0.13
0.03
0.04
0.008
0.02
0.11
0.05
0.02
0.02
0.02
0.09
0.02
0.07
0.01
0.02
0.0031
0.475
0.185
0.0075
0.015
0.01
0.2
0.04
GW
0.24
0.02
0.01
0.03
0.15
0.08
0.04
0.008
0.02
0.11
0.05
0.01
0.015
0.085
0.02
0.07
0.01
0.00302
0.475
0.18
0.0075
0.015
0.0027
0.2
0.04
SW
0.155
0.01
0.05
0.02
0.02
0.03
0.02
0.02
0.1
0.02
0.03
0.5
0.01
0.04
90th Percentile Detect
Concentration (u.g/L)
Total
0.32
0.03
0.42
0.19
0.4
0.19
0.06
0.1
0.02
0.19
0.06
0.03
0.02
0.02
0.29
0.065
0.5
0.01
0.02
0.03
1.6
0.5
0.01
0.09
0.255
0.2
0.23
GW
0.31
0.03
0.42
0.29
0.4
0.12
0.06
0.1
0.02
0.19
0.06
0.01
0.02
0.29
0.065
0.5
0.01
0.0031
1.6
0.5
0.01
0.09
0.01
0.2
0.33
SW
0.35
0.5
0.16
0.02
0.19
0.03
0.02
0.02
0.36
0.02
0.03
0.5
0.5
0.16
Maximum Detect
Concentration (u.g/L)
Total
0.35
0.03
0.5
0.5
0.4
0.19
0.06
0.11
0.02
0.19
0.06
0.03
0.03
0.02
1.1
0.08
0.5
0.01
0.02
0.03
1.6
0.5
0.01
0.23
0.5
0.2
1.6
GW
0.32
0.03
0.42
0.5
0.4
0.12
0.06
0.11
0.02
0.19
0.06
0.01
0.02
1.1
0.08
0.5
0.01
0.0031
1.6
0.5
0.01
0.23
0.01
0.2
1.6
SW
0.35
0.5
0.46
0.02
0.19
0.03
0.03
0.02
0.36
0.02
0.03
0.5
0.5
0.5
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A36b. Ethylene dibromide (EDB) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
572
187
454
933
2,190
819
711
332
1,313
1,825
109
37
657
1,369
1,402
243
634
741
2,035
1,582
1,417
646
2,361
28
773
1,214
1,397
282
312
312
11
1,083
145
783
292
9
4,951
2
177
462
768
341
304
36,215
GW
430
139
382
885
1,888
600
673
329
1,292
1,709
97
36
630
1,265
1,358
93
523
688
1,975
1,552
1,340
596
2,228
22
762
1,196
1,360
267
292
235
5
933
136
723
271
5
4,609
2
82
428
757
196
256
33,245
SW
142
48
72
48
302
219
38
3
21
116
12
1
27
104
44
150
111
53
60
30
77
50
133
6
11
18
37
15
20
77
6
150
9
60
21
4
342
0
95
34
11
145
48
2,970
Total Population Served by Systems
Reporting
Total
594,149
2,890,272
2,453,348
6,055,029
34,482,521
4,994,387
2,608,625
707,346
16,794,862
7,485,941
1,300,349
187,920
929,336
9,186,672
4,866,706
4,612,320
8,407,483
719,849
6,883,399
4,260,523
3,004,094
693,590
6,786,602
47,665
1,462,281
614,066
7,747,090
1,419,356
968,859
1,292,868
2,733,428
2,937,054
913,884
3,445,274
655,146
590,798
25,111,902
23,030
2,172,380
448,513
2,848,014
1,370,807
446,177
188,153,915
GW
222,065
733,275
910,322
2,684,438
12,806,498
529,503
274,738
425,946
14,555,686
1,593,160
1,245,721
53,303
710,707
2,986,275
2,546,970
375,460
1,680,317
284,275
1,707,109
3,010,848
1,689,633
318,486
1,733,551
40,636
685,801
395,955
2,711,144
1,213,960
279,060
350,979
92,894
572,304
173,906
811,841
295,975
109,942
9,297,171
23,030
34,176
197,148
1,599,536
206,634
129,229
72,299,607
SW
372,084
2,156,997
1,543,026
3,370,591
21,676,023
4,464,884
2,333,887
281,400
2,239,176
5,892,781
54,628
134,617
218,629
6,200,397
2,319,736
4,236,860
6,727,166
435,574
5,176,290
1,249,675
1,314,461
375,104
5,053,051
7,029
776,480
218,111
5,035,946
205,396
689,799
941,889
2,640,534
2,364,750
739,978
2,633,433
359,171
480,856
15,814,731
0
2,138,204
251,365
1,248,478
1,164,173
316,948
115,854,308
Percent of Systems
with At Least One Detection
Total
0.000%
6.417%
1.101%
0.750%
2.055%
0.366%
0.703%
0.301%
0.609%
0.055%
2.752%
0.000%
0.304%
0.000%
0.143%
4.115%
0.946%
0.000%
0.000%
0.000%
0.000%
0.000%
0.932%
0.000%
0.776%
0.000%
0.501%
0.355%
0.321%
0.641%
0.000%
0.185%
0.000%
3.831%
0.000%
0.000%
0.000%
0.000%
0.000%
0.433%
0.391%
2.346%
0.329%
0.538%
GW
0.000%
5.036%
1.309%
0.565%
1.642%
0.333%
0.446%
0.304%
0.619%
0.059%
3.093%
0.000%
0.317%
0.000%
0.074%
0.000%
0.382%
0.000%
0.000%
0.000%
0.000%
0.000%
0.853%
0.000%
0.787%
0.000%
0.515%
0.375%
0.000%
0.426%
0.000%
0.214%
0.000%
3.734%
0.000%
0.000%
0.000%
0.000%
0.000%
0.467%
0.396%
3.571%
0.391%
0.442%
SW
0.000%
10.417%
0.000%
4.167%
4.636%
0.457%
5.263%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.273%
6.667%
3.604%
0.000%
0.000%
0.000%
0.000%
0.000%
2.256%
0.000%
0.000%
0.000%
0.000%
0.000%
5.000%
1.299%
0.000%
0.000%
0.000%
5.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.690%
0.000%
1.616%
Percent of Population Served
with At Least One Detection
Total
0.000%
9.190%
0.849%
29.211%
19.134%
0.263%
5.066%
0.031%
15.521%
0.002%
14.572%
0.000%
0.452%
0.000%
0.055%
12.719%
2.149%
0.000%
0.000%
0.000%
0.000%
0.000%
1.389%
0.000%
0.764%
0.000%
1.015%
3.662%
5.832%
1.069%
0.000%
0.316%
0.000%
9.745%
0.000%
0.000%
0.000%
0.000%
0.000%
0.169%
0.038%
0.414%
0.022%
6.924%
GW
0.000%
8.243%
2.288%
3.544%
8.069%
0.174%
5.074%
0.052%
17.909%
0.008%
15.211%
0.000%
0.591%
0.000%
0.043%
0.000%
0.954%
0.000%
0.000%
0.000%
0.000%
0.000%
1.137%
0.000%
1.630%
0.000%
2.902%
4.282%
0.000%
0.480%
0.000%
1.622%
0.000%
8.558%
0.000%
0.000%
0.000%
0.000%
0.000%
0.384%
0.068%
0.633%
0.077%
5.930%
SW
0.000%
9.512%
0.000%
49.652%
25.672%
0.273%
5.065%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.069%
13.846%
2.447%
0.000%
0.000%
0.000%
0.000%
0.000%
1.475%
0.000%
0.000%
0.000%
0.000%
0.000%
8.191%
1.288%
0.000%
0.000%
0.000%
10.111%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.376%
0.000%
7.544%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A36c. Ethylene dibromide (EDB) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.05 ug/L
Total
0
7
0
3
18
2
2
1
1
0
1
0
1
0
0
0
0
0
0
0
0
0
12
0
2
0
5
0
0
0
0
2
0
28
0
0
0
0
0
0
1
1
1
88
GW
0
3
0
2
10
2
1
1
1
0
1
0
1
0
0
0
0
0
0
0
0
0
9
0
2
0
5
0
0
0
0
2
0
25
0
0
0
0
0
0
1
0
1
67
SW
0
4
0
1
8
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3
0
0
0
0
0
0
0
0
0
0
3
0
0
0
0
0
0
0
1
0
21
Percent of Systems
with At Least One Detection
> 0.05 ug/L
Total
0.000%
3.743%
0.000%
0.322%
0.822%
0.244%
0.281%
0.301%
0.076%
0.000%
0.917%
0.000%
0.152%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.508%
0.000%
0.259%
0.000%
0.358%
0.000%
0.000%
0.000%
0.000%
0.185%
0.000%
3.576%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.130%
0.293%
0.329%
0.243%
GW
0.000%
2.158%
0.000%
0.226%
0.530%
0.333%
0.149%
0.304%
0.077%
0.000%
1.031%
0.000%
0.159%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.404%
0.000%
0.262%
0.000%
0.368%
0.000%
0.000%
0.000%
0.000%
0.214%
0.000%
3.458%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.132%
0.000%
0.391%
0.202%
SW
0.000%
8.333%
0.000%
2.083%
2.649%
0.000%
2.632%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.256%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.690%
0.000%
0.707%
Population Served by Systems
with At Least One Detection
> 0.05 ug/L
Total
0
195,362
0
165,250
1,342,592
920
77,279
222
1,248
0
60
0
88
0
0
0
0
0
0
0
0
0
83,394
0
215
0
48,877
0
0
0
0
9,281
0
330,413
0
0
0
0
0
0
385
4,374
100
2,260,060
GW
0
11,114
0
25,250
278,791
920
77
222
1,248
0
60
0
88
0
0
0
0
0
0
0
0
0
8,868
0
215
0
48,877
0
0
0
0
9,281
0
64,152
0
0
0
0
0
0
385
0
100
449,648
SW
0
184,248
0
140,000
1,063,801
0
77,202
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
74,526
0
0
0
0
0
0
0
0
0
0
266,261
0
0
0
0
0
0
0
4,374
0
1,810,412
Percent of Population Served
with At Least One Detection
> 0.05 ug/L
Total
0.000%
6.759%
0.000%
2.729%
3.894%
0.018%
2.962%
0.031%
0.007%
0.000%
0.005%
0.000%
0.009%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.229%
0.000%
0.015%
0.000%
0.631%
0.000%
0.000%
0.000%
0.000%
0.316%
0.000%
9.590%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.014%
0.319%
0.022%
1.201%
GW
0.000%
1.516%
0.000%
0.941%
2.177%
0.174%
0.028%
0.052%
0.009%
0.000%
0.005%
0.000%
0.012%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.512%
0.000%
0.031%
0.000%
1.803%
0.000%
0.000%
0.000%
0.000%
1.622%
0.000%
7.902%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.024%
0.000%
0.077%
0.622%
SW
0.000%
8.542%
0.000%
4.154%
4.908%
0.000%
3.308%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.475%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
10.111%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.376%
0.000%
1.563%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A36d. Ethylene dibromide (EDB) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.025 ug/L
Total
0
8
2
3
33
2
3
1
2
1
2
0
1
0
1
1
0
0
0
0
0
0
15
0
5
0
5
0
1
1
0
2
0
29
0
0
0
0
0
0
2
1
1
122
GW
0
4
2
2
24
2
2
1
2
1
2
0
1
0
0
0
0
0
0
0
0
0
12
0
5
0
5
0
0
0
0
2
0
26
0
0
0
0
0
0
2
0
1
96
SW
0
4
0
1
9
0
1
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
3
0
0
0
0
0
1
1
0
0
0
3
0
0
0
0
0
0
0
1
0
26
Percent of Systems
with At Least One Detection
> 0.025 ug/L
Total
0.000%
4.278%
0.441%
0.322%
1.507%
0.244%
0.422%
0.301%
0.152%
0.055%
1.835%
0.000%
0.152%
0.000%
0.071%
0.412%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.635%
0.000%
0.647%
0.000%
0.358%
0.000%
0.321%
0.321%
0.000%
0.185%
0.000%
3.704%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.260%
0.293%
0.329%
0.337%
GW
0.000%
2.878%
0.524%
0.226%
1.271%
0.333%
0.297%
0.304%
0.155%
0.059%
2.062%
0.000%
0.159%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.539%
0.000%
0.656%
0.000%
0.368%
0.000%
0.000%
0.000%
0.000%
0.214%
0.000%
3.596%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.264%
0.000%
0.391%
0.289%
SW
0.000%
8.333%
0.000%
2.083%
2.980%
0.000%
2.632%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.273%
0.667%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.256%
0.000%
0.000%
0.000%
0.000%
0.000%
5.000%
1.299%
0.000%
0.000%
0.000%
5.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.690%
0.000%
0.875%
Population Served by Systems
with At Least One Detection
> 0.025 ug/L
Total
0
222,140
790
165,250
1,801,652
920
90,986
222
2,548
135
173,489
0
88
0
1,600
13,084
0
0
0
0
0
0
85,845
0
11,076
0
48,877
0
56,500
12,136
0
9,281
0
335,703
0
0
0
0
0
0
585
4,374
100
3,037,381
GW
0
37,892
790
25,250
737,351
920
13,784
222
2,548
135
173,489
0
88
0
0
0
0
0
0
0
0
0
11,319
0
11,076
0
48,877
0
0
0
0
9,281
0
69,442
0
0
0
0
0
0
585
0
100
1,143,149
SW
0
184,248
0
140,000
1,064,301
0
77,202
0
0
0
0
0
0
0
1,600
13,084
0
0
0
0
0
0
74,526
0
0
0
0
0
56,500
12,136
0
0
0
266,261
0
0
0
0
0
0
0
4,374
0
1,894,232
Percent of Population Served
with At Least One Detection
> 0.025 ug/L
Total
0.000%
7.686%
0.032%
2.729%
5.225%
0.018%
3.488%
0.031%
0.015%
0.002%
13.342%
0.000%
0.009%
0.000%
0.033%
0.284%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.265%
0.000%
0.757%
0.000%
0.631%
0.000%
5.832%
0.939%
0.000%
0.316%
0.000%
9.744%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.021%
0.319%
0.022%
1.614%
GW
0.000%
5.168%
0.087%
0.941%
5.758%
0.174%
5.017%
0.052%
0.018%
0.008%
13.927%
0.000%
0.012%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.653%
0.000%
1.615%
0.000%
1.803%
0.000%
0.000%
0.000%
0.000%
1.622%
0.000%
8.554%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.037%
0.000%
0.077%
1.581%
SW
0.000%
8.542%
0.000%
4.154%
4.910%
0.000%
3.308%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.069%
0.309%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.475%
0.000%
0.000%
0.000%
0.000%
0.000%
8.191%
1.288%
0.000%
0.000%
0.000%
10.111%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.376%
0.000%
1.635%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A37. Fluoride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 4 mg/L
> 2 mg/L
> 4 mg/L
> 2 mg/L
>4 mg/L
>2 mg/L
Total # Systems
Reporting
44,577
44,577
4,023
4,023
48,600
48,600
# Systems Exceeding
Threshold of Interest
493
2,298
26
146
519
2,444
% Systems Exceeding
Threshold of Interest
1.106%
5.155%
0.646%
3.629%
1.068%
5.029%
Total Pop. Served by
Systems Reporting
85,996,458
85,996,458
147,572,741
147,572,741
233,569,199
233,569,199
Total Pop. Served by
Systems Exceeding
Threshold of Interest
1,341,331
6,344,789
1,481,883
5,108,236
2,823,214
11,453,025
% Pop. Served by
Systems Exceeding
Threshold of Interest
1.560%
7.378%
1.004%
3.462%
1.209%
4.903%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A37a. Fluoride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
901
2,688
10,058
6,648
58,593
4,444
2,597
2,983
2,581
3,606
3,166
7,062
2,968
3,714
4,327
1,824
3,085
3,598
18,472
26,113
22,948
33,121
3,320
9,333
411
7,890
4,683
11,534
4,016
3,027
6,425
4,928
468
1,327
929
3,743
349
3,730
18,480
7,238
4,439
1,995
6,918
1,348
1,183
333,211
GW
640
1,812
6,994
5,260
32,674
2,421
1,869
2,753
2,447
2,965
3,075
6,002
2,664
3,309
3,824
540
2,073
2,687
9,690
25,390
22,149
22,199
2,762
7,878
319
7,156
4,470
10,136
3,556
2,064
3,790
4,088
307
958
687
3,280
333
1,144
15,003
5,692
2,881
1,690
6,749
523
928
249,831
SW
261
876
3,064
1,388
25,919
2,023
728
230
134
641
91
1,060
304
405
503
1,284
1,012
911
8,782
723
799
10,922
558
1,455
92
734
213
1,398
460
963
2,635
840
161
369
242
463
16
2,586
3,477
1,546
1,558
305
169
825
255
83,380
Percent of Samples
with Detections
Total
32.075%
58.705%
87.940%
89.576%
81.648%
83.686%
53.331%
56.755%
81.209%
74.542%
22.110%
97.890%
72.776%
96.230%
86.804%
90.461%
59.514%
70.873%
90.911%
89.871%
98.775%
89.937%
84.307%
62.049%
100.000%
98.035%
69.742%
38.530%
94.846%
74.133%
67.175%
80.398%
89.957%
33.459%
34.338%
64.707%
99.140%
82.091%
90.168%
84.498%
67.650%
25.113%
79.676%
77.596%
90.955%
81.525%
GW
32.969%
48.455%
88.805%
88.707%
81.585%
88.104%
51.471%
53.505%
80.466%
71.332%
22.764%
97.617%
72.222%
95.981%
86.166%
85.000%
56.343%
73.093%
85.717%
89.740%
98.740%
86.166%
83.309%
59.216%
100.000%
97.834%
70.940%
37.490%
95.669%
75.436%
57.810%
78.425%
90.554%
34.238%
44.687%
62.134%
99.099%
61.014%
90.935%
85.190%
57.723%
23.669%
79.301%
69.790%
93.427%
80.310%
SW
29.885%
79.909%
85.966%
92.867%
81.728%
78.398%
58.104%
95.652%
94.776%
89.392%
0.000%
99.434%
77.632%
98.272%
91.650%
92.757%
66.008%
64.325%
96.641%
94.467%
99.750%
97.601%
89.247%
77.388%
100.000%
100.000%
44.601%
46.066%
88.478%
71.340%
80.645%
90.000%
88.820%
31.436%
4.959%
82.937%
100.000%
91.415%
86.856%
81.953%
86.008%
33.115%
94.675%
82.545%
81.961%
85.166%
Minimum Detect
Concentration (mg/L)
Total
0.0001
0.00059
0.08
0.005
0.00019
0.00344
0.01
0.04
0.01
0.12
0.2
0.1
0.0003
0.00016
0.00014
0.0084
0.01
0.02
0.03
0.05
0.1
0.01
0.008
0.0017
0.05
0.2
0.003
0.0017
0.01
0.02
0.0001
0.00014
0.1
0.06
0.05
0.1
0.00054
0.0005
0.02
0.01
0.01
0.008
0.00027
0.00006
0.0002
0.00006
GW
0.0001
0.00059
0.08
0.005
0.00019
0.00344
0.01
0.04
0.01
0.12
0.2
0.1
0.0003
0.00016
0.00014
0.07
0.01
0.02
0.1
0.05
0.1
0.01
0.008
0.0017
0.05
0.2
0.003
0.0017
0.01
0.02
0.0001
0.00014
0.1
0.08
0.05
0.1
0.06
0.0005
0.03
0.01
0.05
0.008
0.00027
0.00038
0.0016
0.0001
SW
0.0001
0.00084
0.2
0.01
0.0011
0.03
0.01
0.1
0.03
0.2
0.14
0.08
0.00096
0.05
0.0084
0.01
0.05
0.03
0.1
0.11
0.02
0.02
0.03
0.34
0.22
0.1
0.007
0.04
0.03
0.0001
0.00083
0.1
0.06
0.21
0.1
0.00054
0.01
0.02
0.05
0.01
0.03
0.0019
0.00006
0.0002
0.00006
Median Detect
Concentration (mg/L)
Total
0.16
0.82
0.88
0.5
0.42
0.8
0.24
0.68
0.35
0.54
0.25
0.96
0.45
0.96
0.79
0.97
0.3
0.53
1.22
0.3
1.1
1
0.35
0.31
1
0.95
1.34
0.2
0.61
0.505
0.85
0.83
0.38
0.355
0.39
0.66
0.525
0.96
0.5
0.2
0.96
0.33
0.25
0.8
0.5
0.79
GW
0.15
0.66
0.88
0.51
0.47
0.92
0.2
0.62
0.32
0.44
0.25
0.93
0.45
0.96
0.71
0.95
0.24
0.4
1.21
0.3
1.1
1.01
0.3
0.23
0.76
0.94
1.48
0.2
0.64
0.32
0.6
0.62
0.26
0.3
0.42
0.54
0.5
0.79
0.55
0.2
1.66
0.3
0.24
0.32
0.5
0.73
SW
0.62
0.9
0.88
0.48
0.39
0.68
0.81
0.84
0.71
0.91
1.02
0.415
0.995
0.93
0.97
0.81
0.88
1.23
0.9
1.1
1
0.75
0.94
1.15
0.98
1
0.14
0.42
0.84
0.9
0.97
0.77
0.7
0.25
0.78
0.765
0.99
0.4
0.2
0.91
1
1
0.86
0.4
0.86
90th Percentile Detect
Concentration (mg/L)
Total
1.05
1.25
1.18
2.47
1.54
2.1
1
1.09
0.93
1.1
0.64
1.24
1.2
1.46
1.3
1.24
1.2
1.71
1.44
1
1.5
1.28
1.58
1.17
1.92
1.27
3.87
0.7
2.84
1.61
1.1
1.58
1.2
1.2
1.66
2.9
1.58
1.2
2.3
0.5
4.65
1.2
1.11
1.18
1.5
1.4
GW
0.7
1.31
1.27
2.9
2.1
2.4
0.72
1.08
0.93
1
0.64
1.24
1.2
1.51
1.3
1.9
1.25
1.98
1.44
1
1.5
1.31
2.05
1.11
2.41
1.3
3.89
0.685
2.87
1.5
1.1
1.69
1.36
1.2
1.69
3.1
1.605
1.1
2.6
0.5
5.13
1.1
1.1
1.18
1.6
1.5
SW
1.28
1.2
1.09
1
0.99
1.6
1.05
1.115
0.94
1.2
1.22
1.29
1.2
1.2
1.2
1.2
1.08
1.44
1.2
1.3
1.2
1.16
1.2
1.36
1.2
1.27
0.73
2.28
1.63
1.1
1.2
1.1
1.2
0.56
1.08
1.3
1.2
0.905
0.3
1.12
1.22
1.25
1.17
1.1
1.27
Maximum Detect
Concentration (mg/L)
Total
1.42
10.1
17
12.1
27
17.7
7.1
20.8
6.5
16
2.1
12.02
16.7
25.3
5.3
17
29.2
4.8
22
21.9
24
31.1
10.4
14
5.31
28
9.5
10
18.6
6.4
21
3.12
5.48
5.2
3.79
9.6
9.15
2.8
14.3
4.5
21.4
1.9
38
3.74
7
38
GW
1.3
7.76
17
12.1
27
17.7
7.1
19.4
6.5
16
2.1
12.02
16.7
25.3
5.3
4
18.1
4.8
22
21.9
24
31.1
10.4
14
5.31
28
9.5
10
18.6
6.4
3
3.12
5.48
5.2
3.79
9.6
9.15
2.8
14.3
4.5
7.25
1.9
38
3.74
7
38
SW
1.42
10.1
3.8
3.3
22
6.1
1.91
20.8
1.1
4.1
1.79
5.93
1.86
3.42
17
29.2
2.3
3.1
1.8
2.9
3.44
2.05
2.98
2.76
2.2
1.7
1.6
6.8
3.4
21
1.65
4.66
4.9
0.69
1.9
1.51
2.7
4.6
2.8
21.4
1.67
2.2
2.22
3.12
29.2
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A37b. Fluoride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
482
352
453
977
3,744
822
1,170
356
1,338
1,733
112
968
876
1,455
1,482
242
678
638
809
3,086
1,468
1,423
842
2,283
217
737
1,228
1,372
717
338
1,600
1,934
197
730
143
823
207
350
4,935
506
1,617
597
1,805
454
304
48,600
GW
384
279
381
929
3,220
602
1,131
353
1,312
1,617
100
935
829
1,356
1,433
93
559
576
754
3,025
1,440
1,344
783
2,144
190
726
1,187
1,335
678
317
1,357
1,808
165
606
134
758
199
161
4,592
457
1,440
555
1,785
293
255
44,577
SW
98
73
72
48
524
220
39
3
26
116
12
33
47
99
49
149
119
62
55
61
28
79
59
139
27
11
41
37
39
21
243
126
32
124
9
65
8
189
343
49
177
42
20
161
49
4,023
Total Population Served by Systems
Reporting
Total
519,993
4,701,100
2,452,800
6,129,907
36,402,771
4,994,055
2,716,176
714,769
17,215,909
7,466,899
1,305,882
2,503,908
1,067,405
9,318,753
4,949,127
4,602,489
8,529,124
4,925,647
729,432
7,173,058
4,164,508
4,804,863
756,961
6,973,518
563,069
1,451,390
944,942
7,762,979
1,673,433
973,605
11,225,138
10,225,777
782,508
2,813,374
913,584
3,462,992
194,476
5,683,572
25,112,657
2,543,652
5,729,159
490,319
4,041,330
1,416,005
446,184
233,569,199
GW
208,399
1,463,066
909,774
2,759,316
13,574,162
529,180
382,254
433,369
14,969,867
1,574,118
1,251,254
1,395,282
826,967
3,124,531
2,588,672
375,460
1,718,190
931,307
292,198
1,993,202
2,915,017
1,692,282
364,562
1,708,352
257,844
674,910
395,143
2,727,033
1,406,885
283,714
1,229,838
3,129,983
262,331
486,528
173,606
804,465
121,093
1,460,816
9,327,672
1,686,017
647,279
226,551
2,349,586
235,215
129,168
85,996,458
SW
311,594
3,238,034
1,543,026
3,370,591
22,828,609
4,464,875
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
240,438
6,194,222
2,360,455
4,227,029
6,810,934
3,994,340
437,234
5,179,856
1,249,491
3,112,581
392,399
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
9,995,300
7,095,794
520,177
2,326,846
739,978
2,658,527
73,383
4,222,756
15,784,985
857,635
5,081,880
263,768
1,691,744
1,180,790
317,016
147,572,741
Percent of Systems
with At Least One Detection
Total
38.382%
69.602%
72.627%
96.520%
79.915%
94.404%
61.282%
50.562%
76.532%
72.706%
27.679%
97.314%
85.502%
94.433%
90.486%
98.760%
74.926%
75.705%
49.938%
97.246%
91.689%
57.906%
92.993%
74.376%
100.000%
95.387%
72.638%
60.277%
98.187%
89.941%
52.063%
83.816%
82.741%
31.096%
59.441%
67.315%
99.034%
85.429%
95.096%
96.047%
51.082%
38.191%
91.025%
78.194%
95.066%
79.276%
GW
40.104%
63.082%
75.591%
96.448%
80.373%
95.017%
60.212%
50.142%
76.296%
71.305%
31.000%
97.219%
86.972%
94.100%
90.230%
96.774%
72.987%
74.826%
48.143%
97.190%
91.597%
55.506%
92.976%
73.507%
100.000%
95.317%
73.631%
59.476%
98.083%
90.536%
50.111%
83.020%
88.485%
31.023%
61.940%
65.303%
98.995%
75.776%
95.035%
95.842%
48.333%
37.477%
90.924%
70.648%
96.078%
78.991%
SW
31.633%
94.521%
56.944%
97.917%
77.099%
92.727%
92.308%
100.000%
88.462%
92.241%
0.000%
100.000%
59.574%
98.990%
97.959%
100.000%
84.034%
83.871%
74.545%
100.000%
96.429%
98.734%
93.220%
87.770%
100.000%
100.000%
43.902%
89.189%
100.000%
80.952%
62.963%
95.238%
53.125%
31.452%
22.222%
90.769%
100.000%
93.651%
95.918%
97.959%
73.446%
47.619%
100.000%
91.925%
89.796%
82.426%
Percent of Population Served
with At Least One Detection
Total
75.469%
92.277%
80.493%
98.787%
94.888%
99.506%
92.166%
79.464%
95.723%
97.780%
29.594%
99.638%
95.118%
99.668%
99.233%
99.996%
81.783%
98.512%
82.379%
99.749%
99.663%
94.654%
97.437%
97.260%
100.000%
99.342%
69.744%
93.496%
99.755%
97.910%
91.487%
97.246%
95.361%
66.219%
20.095%
95.858%
99.919%
85.563%
99.546%
99.367%
94.094%
61.858%
98.315%
97.416%
95.068%
94.425%
GW
62.684%
79.447%
90.071%
97.308%
94.139%
97.015%
57.627%
66.129%
95.101%
91.409%
30.887%
99.351%
95.649%
99.013%
98.544%
99.947%
49.617%
93.647%
68.234%
99.098%
99.521%
84.893%
95.308%
93.133%
100.000%
98.584%
69.125%
83.582%
99.709%
98.098%
48.247%
91.179%
96.150%
55.418%
90.087%
82.796%
99.870%
49.295%
99.103%
99.651%
58.539%
40.745%
97.103%
89.603%
97.385%
90.508%
SW
84.020%
98.074%
74.846%
99.998%
95.333%
99.801%
97.823%
100.000%
99.866%
99.482%
0.000%
100.000%
93.292%
99.998%
99.987%
100.000%
89.897%
99.646%
91.831%
100.000%
99.996%
99.961%
99.416%
98.599%
100.000%
100.000%
70.190%
98.864%
100.000%
97.833%
96.808%
99.921%
94.963%
68.478%
3.674%
99.811%
100.000%
98.109%
99.807%
98.808%
98.623%
79.992%
100.000%
98.972%
94.124%
96.708%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A37c. Fluoride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 4 mg/L
Total
0
5
8
38
39
14
3
5
3
10
0
4
9
17
7
3
4
3
7
9
40
14
15
7
2
10
32
4
20
2
3
0
2
4
0
11
2
0
83
2
61
0
12
0
5
519
GW
0
4
8
38
32
12
3
3
3
9
0
4
8
17
7
0
3
3
7
9
40
14
15
7
2
10
32
4
19
2
0
0
1
3
0
11
2
0
82
2
60
0
12
0
5
493
SW
0
1
0
0
7
2
0
2
0
1
0
0
1
0
0
3
1
0
0
0
0
0
0
0
0
0
0
0
1
0
3
0
1
1
0
0
0
0
1
0
1
0
0
0
0
26
Percent of Systems
with At Least One Detection
> 4 mg/L
Total
0.000%
1.420%
1.766%
3.889%
1.042%
1.703%
0.256%
1.404%
0.224%
0.577%
0.000%
0.413%
1.027%
1.168%
0.472%
1.240%
0.590%
0.470%
0.865%
0.292%
2.725%
0.984%
1.781%
0.307%
0.922%
1.357%
2.606%
0.292%
2.789%
0.592%
0.188%
0.000%
1.015%
0.548%
0.000%
1.337%
0.966%
0.000%
1.682%
0.395%
3.772%
0.000%
0.665%
0.000%
1.645%
1.068%
GW
0.000%
1.434%
2.100%
4.090%
0.994%
1.993%
0.265%
0.850%
0.229%
0.557%
0.000%
0.428%
0.965%
1.254%
0.488%
0.000%
0.537%
0.521%
0.928%
0.298%
2.778%
1.042%
1.916%
0.326%
1.053%
1.377%
2.696%
0.300%
2.802%
0.631%
0.000%
0.000%
0.606%
0.495%
0.000%
1.451%
1.005%
0.000%
1.786%
0.438%
4.167%
0.000%
0.672%
0.000%
1.961%
1.106%
SW
0.000%
1.370%
0.000%
0.000%
1.336%
0.909%
0.000%
66.667%
0.000%
0.862%
0.000%
0.000%
2.128%
0.000%
0.000%
2.013%
0.840%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.564%
0.000%
1.235%
0.000%
3.125%
0.806%
0.000%
0.000%
0.000%
0.000%
0.292%
0.000%
0.565%
0.000%
0.000%
0.000%
0.000%
0.646%
Population Served by Systems
with At Least One Detection
>4 mg/L
Total
0
55,123
37,108
61,306
1,347,272
5,968
13,202
231,394
435
26,233
0
2,277
1,551
64,306
3,099
27,507
84,631
5,526
5,959
26,119
32,203
52,774
5,028
8,910
196
30,445
6,786
1,975
68,250
1,160
82,977
0
125,520
10,705
0
40,158
1,707
0
226,143
6,938
66,614
0
27,370
0
28,339
2,823,214
GW
0
32,873
37,108
61,306
495,658
5,118
13,202
55,264
435
24,106
0
2,277
1,411
64,306
3,099
0
40,870
5,526
5,959
26,119
32,203
52,774
5,028
8,910
196
30,445
6,786
1,975
68,017
1,160
0
0
89
755
0
40,158
1,707
0
127,998
6,938
25,846
0
27,370
0
28,339
1,341,331
SW
0
22,250
0
0
851,614
850
0
176,130
0
2,127
0
0
140
0
0
27,507
43,761
0
0
0
0
0
0
0
0
0
0
0
233
0
82,977
0
125,431
9,950
0
0
0
0
98,145
0
40,768
0
0
0
0
1,481,883
Percent of Population Served
with At Least One Detection
>4 mg/L
Total
0.000%
1.173%
1.513%
1.000%
3.701%
0.120%
0.486%
32.373%
0.003%
0.351%
0.000%
0.091%
0.145%
0.690%
0.063%
0.598%
0.992%
0.112%
0.817%
0.364%
0.773%
1.098%
0.664%
0.128%
0.035%
2.098%
0.718%
0.025%
4.078%
0.119%
0.739%
0.000%
16.041%
0.381%
0.000%
1.160%
0.878%
0.000%
0.901%
0.273%
1.163%
0.000%
0.677%
0.000%
6.351%
1.209%
GW
0.000%
2.247%
4.079%
2.222%
3.651%
0.967%
3.454%
12.752%
0.003%
1.531%
0.000%
0.163%
0.171%
2.058%
0.120%
0.000%
2.379%
0.593%
2.039%
1.310%
1.105%
3.119%
1.379%
0.522%
0.076%
4.511%
1.717%
0.072%
4.835%
0.409%
0.000%
0.000%
0.034%
0.155%
0.000%
4.992%
1.410%
0.000%
1.372%
0.412%
3.993%
0.000%
1.165%
0.000%
21.940%
1.560%
SW
0.000%
0.687%
0.000%
0.000%
3.730%
0.019%
0.000%
62.591%
0.000%
0.036%
0.000%
0.000%
0.058%
0.000%
0.000%
0.651%
0.643%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.087%
0.000%
0.830%
0.000%
24.113%
0.428%
0.000%
0.000%
0.000%
0.000%
0.622%
0.000%
0.802%
0.000%
0.000%
0.000%
0.000%
1.004%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A37d. Fluoride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2 mg/L
Total
0
25
25
140
130
148
10
6
16
28
1
48
26
74
68
17
12
20
33
35
230
76
46
62
18
28
115
15
76
15
15
61
10
13
5
49
14
6
464
9
184
0
41
4
26
2,444
GW
0
21
23
133
111
124
10
4
16
25
1
48
24
74
65
9
8
19
27
35
111
69
45
57
17
27
115
15
75
13
10
61
9
11
5
49
14
1
449
7
179
0
40
2
24
2,298
SW
0
4
2
7
19
24
0
2
0
3
0
0
2
0
3
8
4
1
6
0
3
7
1
5
1
1
0
0
1
2
5
0
1
2
0
0
0
5
15
2
5
0
1
2
2
146
Percent of Systems
with At Least One Detection
> 2 mg/L
Total
0.000%
7.102%
5.519%
14.330%
3.472%
18.005%
0.855%
1.685%
1.196%
1.616%
0.893%
4.959%
2.968%
5.086%
4.588%
7.025%
1.770%
3.135%
4.079%
1.134%
15.668%
5.341%
5.463%
2.716%
8.295%
3.799%
9.365%
1.093%
10.600%
4.438%
0.938%
3.154%
5.076%
1.781%
3.497%
5.954%
6.763%
1.714%
9.402%
1.779%
11.379%
0.000%
2.271%
0.881%
8.553%
5.029%
GW
0.000%
7.527%
6.037%
14.316%
3.447%
20.598%
0.884%
1.133%
1.220%
1.546%
1.000%
5.134%
2.895%
5.457%
4.536%
9.677%
1.431%
3.299%
3.581%
1.157%
15.764%
5.134%
5.747%
2.659%
8.947%
3.719%
9.688%
1.124%
11.062%
4.101%
0.737%
3.374%
5.455%
1.815%
3.731%
6.464%
7.035%
0.621%
9.778%
1.532%
12.431%
0.000%
2.241%
0.683%
9.412%
5.155%
SW
0.000%
5.479%
2.778%
14.583%
3.626%
10.909%
0.000%
66.667%
0.000%
2.586%
0.000%
0.000%
4.255%
0.000%
6.122%
5.369%
3.361%
1.613%
10.909%
0.000%
10.714%
8.861%
1.695%
3.597%
3.704%
9.091%
0.000%
0.000%
2.564%
9.524%
2.058%
0.000%
3.125%
1.613%
0.000%
0.000%
0.000%
2.646%
4.373%
4.082%
2.825%
0.000%
5.000%
1.242%
4.082%
3.629%
Population Served by Systems
with At Least One Detection
>2 mg/L
Total
0
308,003
134,993
1,842,086
2,242,341
374,552
13,596
233,794
11,964
88,553
260
59,748
235,508
196,428
122,357
121,981
190,572
105,414
93,474
83,524
290,666
266,367
11,412
414,925
16,094
66,224
28,180
115,187
125,166
77,147
113,850
49,780
140,651
37,800
1,357
83,020
7,593
48,732
2,347,413
106,327
296,424
0
294,702
8,816
46,044
11,453,025
GW
0
181,785
120,165
1,171,217
937,450
171,475
13,596
57,664
11,964
75,610
260
59,748
49,368
196,428
89,366
5,026
54,700
51,414
33,566
83,524
280,872
189,781
10,612
299,726
14,311
57,659
28,180
115,187
124,933
20,347
8,073
49,780
15,220
11,020
1,357
83,020
7,593
2,547
1,286,745
23,937
121,290
0
191,684
595
35,994
6,344,789
SW
0
126,218
14,828
670,869
1,304,891
203,077
0
176,130
0
12,943
0
0
186,140
0
32,991
116,955
135,872
54,000
59,908
0
9,794
76,586
800
115,199
1,783
8,565
0
0
233
56,800
105,777
0
125,431
26,780
0
0
0
46,185
1,060,668
82,390
175,134
0
103,018
8,221
10,050
5,108,236
Percent of Population Served
with At Least One Detection
> 2 mg/L
Total
0.000%
6.552%
5.504%
30.051%
6.160%
7.500%
0.501%
32.709%
0.069%
1.186%
0.020%
2.386%
22.064%
2.108%
2.472%
2.650%
2.234%
2.140%
12.815%
1.164%
6.980%
5.544%
1.508%
5.950%
2.858%
4.563%
2.982%
1.484%
7.480%
7.924%
1.014%
0.487%
17.974%
1.344%
0.149%
2.397%
3.904%
0.857%
9.348%
4.180%
5.174%
0.000%
7.292%
0.623%
10.320%
4.903%
GW
0.000%
12.425%
13.208%
42.446%
6.906%
32.404%
3.557%
13.306%
0.080%
4.803%
0.021%
4.282%
5.970%
6.287%
3.452%
1.339%
3.184%
5.521%
11.487%
4.190%
9.635%
11.215%
2.911%
17.545%
5.550%
8.543%
7.132%
4.224%
8.880%
7.172%
0.656%
1.590%
5.802%
2.265%
0.782%
10.320%
6.270%
0.174%
13.795%
1.420%
18.738%
0.000%
8.158%
0.253%
27.866%
7.378%
SW
0.000%
3.898%
0.961%
19.904%
5.716%
4.548%
0.000%
62.591%
0.000%
0.220%
0.000%
0.000%
77.417%
0.000%
1.398%
2.767%
1.995%
1.352%
13.702%
0.000%
0.784%
2.461%
0.204%
2.188%
0.584%
1.103%
0.000%
0.000%
0.087%
8.233%
1.058%
0.000%
24.113%
1.151%
0.000%
0.000%
0.000%
1.094%
6.719%
9.607%
3.446%
0.000%
6.089%
0.696%
3.170%
3.462%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A38. Glyphosate — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 700 ug/L
> 350 ug/L
> 700 ug/L
> 350 ug/L
> 700 ug/L
> 350 ug/L
Total # Systems
Reporting
14,974
14,974
1,377
1,377
16,351
16,351
# Systems Exceeding
Threshold of Interest
0
1
0
1
0
2
% Systems Exceeding
Threshold of Interest
0.000%
0.007%
0.000%
0.073%
0.000%
0.012%
Total Pop. Served by
Systems Reporting
46,311,603
46,311,603
69,964,408
69,964,408
116,276,011
116,276,011
Total Pop. Served by
Systems Exceeding
Threshold of Interest
0
40
0
48,800
0
48,840
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.070%
0.000%
0.042%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A38a. Glyphosate — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
28
504
1,505
5,103
10,882
430
1,288
3
2,350
1,421
1,694
47
1,252
903
2,178
1,710
7
167
1
29
4,574
923
59
1,293
4,193
1
4,247
1,541
82
533
3
2,082
4
2,824
949
83
40
3
12
3,164
5
57
58,174
GW
10
376
1,290
4,123
5,769
367
980
0
2,285
1,348
1,649
30
1,038
747
2,041
440
2
9
1
17
4,439
833
38
1,273
3,874
1
3,996
1,150
8
382
3
1,600
4
2,462
840
14
30
1
11
3,073
3
34
46,591
SW
18
128
215
980
5,113
63
308
3
65
73
45
17
214
156
137
1,270
5
158
0
12
135
90
21
20
319
0
251
391
74
151
0
482
0
362
109
69
10
2
1
91
2
23
11,583
Percent of Samples
with Detections
Total
0.000%
0.000%
0.000%
0.118%
0.018%
0.000%
0.000%
0.000%
0.766%
0.070%
0.000%
0.000%
0.000%
0.000%
0.000%
0.468%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.195%
0.000%
0.000%
0.000%
0.048%
0.000%
0.035%
0.000%
0.000%
2.500%
0.000%
0.000%
0.000%
0.000%
0.000%
0.070%
GW
0.000%
0.000%
0.000%
0.146%
0.017%
0.000%
0.000%
0.000%
0.788%
0.074%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.087%
0.000%
0.000%
0.000%
0.063%
0.000%
0.041%
0.000%
0.000%
3.333%
0.000%
0.000%
0.000%
0.000%
0.000%
0.064%
SW
0.000%
0.000%
0.000%
0.000%
0.020%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.630%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.512%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.095%
Minimum Detect
Concentration (u.g/L)
Total
6
25
5.5
290
2.6
6
30
6
10
2.6
GW
6
25
5.5
290
25
30
6
10
5.5
SW
66
2.6
6
2.6
Median Detect
Concentration (u.g/L)
Total
8
45.5
10
290
17.5
6
30
6
10
10
GW
8
25
10
290
25
30
6
10
10
SW
66
17.5
6
10
90th Percentile Detect
Concentration (u.g/L)
Total
75
66
100
290
500
25
30
6
10
95
GW
75
25
100
290
25
30
6
10
97.5
SW
66
500
6
66
Maximum Detect
Concentration (u.g/L)
Total
75
66
700
290
500
25
30
6
10
700
GW
75
25
700
290
25
30
6
10
700
SW
66
500
6
500
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A38b. Glyphosate — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
6
172
454
903
1,015
220
645
1
1,307
293
109
3
566
454
1,254
243
3
16
1
15
1,282
605
28
634
1,237
1
691
289
16
268
3
1,097
4
765
261
27
12
2
12
1,407
5
25
16,351
GW
4
127
382
856
779
185
608
0
1,286
280
97
2
539
389
1,216
93
2
6
1
8
1,253
557
22
631
1,196
1
655
268
7
189
3
947
4
706
240
8
8
1
11
1,387
3
17
14,974
SW
2
45
72
47
236
35
37
1
21
13
12
1
27
65
38
150
1
10
0
7
29
48
6
3
41
0
36
21
9
79
0
150
0
59
21
19
4
1
1
20
2
8
1,377
Total Population Served by Systems
Reporting
Total
22,245
2,709,297
2,453,348
5,957,975
32,642,273
2,360,023
2,585,363
140,000
16,746,341
987,804
1,300,349
162,167
872,578
2,206,524
4,079,635
4,612,320
66,881
3,586,512
320
3,772,657
3,931,436
685,741
47,665
1,110,676
945,754
2,061
1,659,972
960,377
516,990
6,465,132
2,634
2,940,254
38,550
3,425,938
622,272
1,155,929
332,145
5,726
76,640
3,883,613
11,455
190,439
116,276,011
GW
13,281
596,709
910,322
2,589,884
11,425,552
223,603
258,096
0
14,507,165
298,453
1,245,721
27,550
654,686
921,320
1,859,916
375,460
29,266
2,940
320
15,818
2,681,795
309,762
40,636
573,060
395,955
2,061
1,397,074
270,486
17,742
482,792
2,634
575,504
38,550
799,155
263,101
144,998
136,535
650
7,717
2,191,869
8,605
14,860
46,311,603
SW
8,964
2,112,588
1,543,026
3,368,091
21,216,721
2,136,420
2,327,267
140,000
2,239,176
689,351
54,628
134,617
217,892
1,285,204
2,219,719
4,236,860
37,615
3,583,572
0
3,756,839
1,249,641
375,979
7,029
537,616
549,799
0
262,898
689,891
499,248
5,982,340
0
2,364,750
0
2,626,783
359,171
1,010,931
195,610
5,076
68,923
1,691,744
2,850
175,579
69,964,408
Percent of Systems
with At Least One Detection
Total
0.000%
0.000%
0.000%
0.332%
0.197%
0.000%
0.000%
0.000%
0.918%
0.341%
0.000%
0.000%
0.000%
0.000%
0.000%
2.469%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.692%
0.000%
0.000%
0.000%
0.091%
0.000%
0.131%
0.000%
0.000%
8.333%
0.000%
0.000%
0.000%
0.000%
0.000%
0.177%
GW
0.000%
0.000%
0.000%
0.350%
0.128%
0.000%
0.000%
0.000%
0.933%
0.357%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.373%
0.000%
0.000%
0.000%
0.106%
0.000%
0.142%
0.000%
0.000%
12.500%
0.000%
0.000%
0.000%
0.000%
0.000%
0.140%
SW
0.000%
0.000%
0.000%
0.000%
0.424%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.762%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.581%
Percent of Population Served
with At Least One Detection
Total
0.000%
0.000%
0.000%
0.416%
0.011%
0.000%
0.000%
0.000%
16.638%
0.045%
0.000%
0.000%
0.000%
0.000%
0.000%
8.494%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
34.910%
0.000%
0.000%
0.000%
0.005%
0.000%
0.004%
0.000%
0.000%
0.009%
0.000%
0.000%
0.000%
0.000%
0.000%
3.047%
GW
0.000%
0.000%
0.000%
0.957%
0.002%
0.000%
0.000%
0.000%
19.206%
0.150%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.333%
0.000%
0.000%
0.000%
0.025%
0.000%
0.015%
0.000%
0.000%
0.022%
0.000%
0.000%
0.000%
0.000%
0.000%
6.074%
SW
0.000%
0.000%
0.000%
0.000%
0.016%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
9.247%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
48.467%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.043%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A38c. Glyphosate — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 700 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 700 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 700 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 700 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A38d. Glyphosate — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 350 ug/L
Total
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
GW
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Percent of Systems
with At Least One Detection
> 350 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.077%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.412%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.012%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.078%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.667%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.073%
Population Served by Systems
with At Least One Detection
> 350 ug/L
Total
0
0
0
0
0
0
0
0
40
0
0
0
0
0
0
48,800
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
48,840
GW
0
0
0
0
0
0
0
0
40
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
40
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
48,800
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
48,800
Percent of Population Served
with At Least One Detection
> 350 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.058%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.042%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.0003%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.0001%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.152%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.070%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A39. Heptach lor — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 0.4 u.g/L
> 0.2 ug/L
> 0.1 ug/L
> 0.4 u.g/L
> 0.2 ug/L
> 0.1 ug/L
> 0.4 u.g/L
> 0.2 ug/L
> 0.1 ug/L
Total # Systems
Reporting
29,965
29,965
29,965
3,055
3,055
3,055
33,020
33,020
33,020
# Systems Exceeding
Threshold of Interest
1
3
207
1
4
27
2
7
234
% Systems Exceeding
Threshold of Interest
0.003%
0.010%
0.691%
0.033%
0.131%
0.884%
0.006%
0.021%
0.709%
Total Pop. Served by
Systems Reporting
67,922,151
67,922,151
67,922,151
116,521,633
116,521,633
116,521,633
184,443,784
184,443,784
184,443,784
Total Pop. Served by
Systems Exceeding
Threshold of Interest
325
5,615
470,220
4,374
262,286
3,435,360
4,699
267,901
3,905,580
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.008%
0.692%
0.004%
0.225%
2.948%
0.003%
0.145%
2.117%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A39a. Heptach lor — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
103
525
1,664
7,207
13,241
2,533
1,331
758
2,393
1,482
1,947
146
1,737
4,686
2,241
1,746
3,025
2,748
456
6,875
4,761
5,559
2,958
13,608
403
4,480
4,193
41
4,367
1,638
2,942
235
2,054
601
2,928
953
62
11,038
7,115
503
1,321
3,193
645
1,284
133,726
GW
53
394
1,423
5,637
7,880
1,829
1,013
729
2,326
1,402
1,850
131
1,479
3,945
2,077
447
2,238
1,729
391
6,423
4,620
4,691
2,656
12,473
337
4,131
3,874
33
4,115
1,200
2,203
97
1,571
414
2,537
844
12
5,279
5,927
178
1,118
3,100
336
964
106,106
SW
50
131
241
1,570
5,361
704
318
29
67
80
97
15
258
741
164
1,299
787
1,019
65
452
141
868
302
1,135
66
349
319
8
252
438
739
138
483
187
391
109
50
5,759
1,188
325
203
93
309
320
27,620
Percent of Samples
with Detections
Total
0.000%
0.000%
0.000%
0.014%
0.045%
0.000%
0.000%
0.264%
0.460%
0.000%
0.000%
0.000%
0.000%
0.043%
0.000%
0.401%
0.066%
0.291%
0.000%
0.000%
0.000%
0.000%
0.000%
0.015%
0.496%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
18.340%
0.000%
0.000%
0.000%
0.000%
0.000%
0.076%
0.063%
2.171%
0.000%
0.446%
GW
0.000%
0.000%
0.000%
0.000%
0.063%
0.000%
0.000%
0.137%
0.473%
0.000%
0.000%
0.000%
0.000%
0.051%
0.000%
0.224%
0.000%
0.058%
0.000%
0.000%
0.000%
0.000%
0.000%
0.008%
0.593%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
19.117%
0.000%
0.000%
0.000%
0.000%
0.000%
0.089%
0.065%
2.679%
0.000%
0.491%
SW
0.000%
0.000%
0.000%
0.064%
0.019%
0.000%
0.000%
3.448%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.462%
0.254%
0.687%
0.000%
0.000%
0.000%
0.000%
0.000%
0.088%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
13.299%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.618%
0.000%
0.275%
Minimum Detect
Concentration (u.g/L)
Total
0.2
0.004
0.1
0.001
0.02
0.001
0.01
0.01
0.14
0.06
0.1
0.08
0.17
0.0045
0.001
GW
0.004
0.18
0.001
0.02
0.1
0.04
0.39
0.06
0.1
0.08
0.17
0.0045
0.001
SW
0.2
0.04
0.1
0.001
0.01
0.01
0.14
0.1
0.0077
0.001
Median Detect
Concentration (u.g/L)
Total
0.2
0.01
0.14
0.001
0.035
0.1
0.01
0.015
0.265
0.065
0.1
0.08
0.185
0.0077
0.1
GW
0.01
0.18
0.001
0.035
0.1
0.04
0.39
0.065
0.1
0.08
0.185
0.0077
0.1
SW
0.2
0.04
0.1
0.12
0.01
0.01
0.14
0.1
0.04
0.1
90th Percentile Detect
Concentration (u.g/L)
Total
0.2
0.04
0.18
0.001
0.05
0.2
0.01
0.12
0.39
0.07
0.1
0.08
0.2
0.5
0.1
GW
0.01
0.18
0.001
0.05
0.1
0.04
0.39
0.07
0.1
0.08
0.2
0.5
0.1
SW
0.2
0.04
0.1
0.2
0.01
0.12
0.14
0.1
0.5
0.12
Maximum Detect
Concentration (u.g/L)
Total
0.2
0.04
0.18
0.008
0.05
0.2
0.01
0.12
0.39
0.07
0.1
0.08
0.2
0.5
0.5
GW
0.01
0.18
0.008
0.05
0.1
0.04
0.39
0.07
0.1
0.08
0.2
0.5
0.5
SW
0.2
0.04
0.1
0.2
0.01
0.12
0.14
0.1
0.5
0.5
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A39b. Heptachlor — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
15
176
450
949
1,628
808
656
201
1,314
297
100
95
723
1,371
1,402
243
644
862
269
2,935
1,287
1,471
812
2,365
208
762
1,237
36
695
291
1,347
48
1,084
86
770
261
12
2,002
427
182
442
1,410
343
304
33,020
GW
10
131
379
901
1,335
589
618
198
1,293
283
88
93
676
1,267
1,358
93
527
794
241
2,874
1,258
1,395
752
2,228
181
751
1,196
30
659
270
1,116
36
934
77
711
240
6
1,665
390
71
409
1,390
196
256
29,965
SW
5
45
71
48
293
219
38
3
21
14
12
2
47
104
44
150
117
68
28
61
29
76
60
137
27
11
41
6
36
21
231
12
150
9
59
21
6
337
37
111
33
20
147
48
3,055
Total Population Served by Systems
Reporting
Total
246,261
2,738,380
2,447,627
6,081,248
33,775,878
4,990,621
2,595,293
628,982
16,792,349
997,274
1,256,886
238,892
978,700
9,186,700
4,866,706
4,612,320
8,485,298
4,906,096
510,420
7,227,231
3,934,332
2,644,644
753,149
6,885,177
559,142
1,455,834
945,754
1,444,605
1,662,962
960,972
4,924,771
3,617,992
2,937,104
902,061
3,427,270
622,272
655,614
21,523,196
2,500,736
2,391,215
432,910
3,883,918
1,368,815
446,177
184,443,784
GW
14,306
625,792
905,863
2,710,657
12,089,748
523,712
261,406
347,582
14,553,173
305,252
1,202,258
99,507
742,024
2,986,303
2,546,970
375,460
1,682,916
907,989
134,500
2,047,375
2,684,691
1,700,183
360,480
1,733,551
253,917
679,354
395,955
143,223
1,400,064
271,081
981,494
147,360
572,354
162,083
800,487
263,101
145,112
5,759,696
1,667,550
30,317
181,746
2,192,174
204,156
129,229
67,922,151
SW
231,955
2,112,588
1,541,764
3,370,591
21,686,130
4,466,909
2,333,887
281,400
2,239,176
692,022
54,628
139,385
236,676
6,200,397
2,319,736
4,236,860
6,802,382
3,998,107
375,920
5,179,856
1,249,641
944,461
392,669
5,151,626
305,225
776,480
549,799
1,301,382
262,898
689,891
3,943,277
3,470,632
2,364,750
739,978
2,626,783
359,171
510,502
15,763,500
833,186
2,360,898
251,164
1,691,744
1,164,659
316,948
116,521,633
Percent of Systems
with At Least One Detection
Total
0.000%
0.000%
0.000%
0.105%
0.184%
0.000%
0.000%
0.995%
0.381%
0.000%
0.000%
0.000%
0.000%
0.146%
0.000%
2.058%
0.155%
0.464%
0.000%
0.000%
0.000%
0.000%
0.000%
0.085%
0.962%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
28.701%
0.000%
0.000%
0.000%
0.000%
0.000%
0.226%
0.142%
3.499%
0.000%
0.796%
GW
0.000%
0.000%
0.000%
0.000%
0.150%
0.000%
0.000%
0.505%
0.387%
0.000%
0.000%
0.000%
0.000%
0.158%
0.000%
1.075%
0.000%
0.126%
0.000%
0.000%
0.000%
0.000%
0.000%
0.045%
1.105%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
28.270%
0.000%
0.000%
0.000%
0.000%
0.000%
0.244%
0.144%
4.592%
0.000%
0.761%
SW
0.000%
0.000%
0.000%
2.083%
0.341%
0.000%
0.000%
33.333%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.667%
0.855%
4.412%
0.000%
0.000%
0.000%
0.000%
0.000%
0.730%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
33.898%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.041%
0.000%
1.146%
Percent of Population Served
with At Least One Detection
Total
0.000%
0.000%
0.000%
0.027%
0.121%
0.000%
0.000%
22.284%
15.508%
0.000%
0.000%
0.000%
0.000%
1.695%
0.000%
7.279%
0.516%
69.869%
0.000%
0.000%
0.000%
0.000%
0.000%
1.165%
0.196%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
49.559%
0.000%
0.000%
0.000%
0.000%
0.000%
0.071%
0.193%
0.829%
0.000%
4.635%
GW
0.000%
0.000%
0.000%
0.000%
0.327%
0.000%
0.000%
0.047%
17.894%
0.000%
0.000%
0.000%
0.000%
5.214%
0.000%
1.749%
0.000%
0.039%
0.000%
0.000%
0.000%
0.000%
0.000%
0.221%
0.432%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
56.446%
0.000%
0.000%
0.000%
0.000%
0.000%
0.169%
0.342%
0.971%
0.000%
4.819%
SW
0.000%
0.000%
0.000%
0.049%
0.007%
0.000%
0.000%
49.751%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
7.769%
0.643%
85.728%
0.000%
0.000%
0.000%
0.000%
0.000%
1.483%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
47.461%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.804%
0.000%
4.528%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A39c. Heptach lor — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.4 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
2
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
Percent of Systems
with At Least One Detection
> 0.4 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.583%
0.000%
0.006%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.510%
0.000%
0.003%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.680%
0.000%
0.033%
Population Served by Systems
with At Least One Detection
> 0.4 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4,699
0
4,699
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
325
0
325
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4,374
0
4,374
Percent of Population Served
with At Least One Detection
> 0.4 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.343%
0.000%
0.003%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.159%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.376%
0.000%
0.004%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A39d. Heptachlor — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.2 ug/L
Total
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
3
0
7
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
3
sw
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
4
Percent of Systems
with At Least One Detection
> 0.2 ug/L
Total
0.000%
0.000%
0.000%
0.105%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.412%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.042%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.071%
0.875%
0.000%
0.021%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.045%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.072%
0.510%
0.000%
0.010%
sw
0.000%
0.000%
0.000%
2.083%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.667%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.361%
0.000%
0.131%
Population Served by Systems
with At Least One Detection
> 0.2 ug/L
Total
0
0
0
1,650
0
0
0
0
0
0
0
0
0
0
0
254,462
0
0
0
0
0
0
0
3,832
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1,458
6,499
0
267,901
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3,832
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1,458
325
0
5,615
SW
0
0
0
1,650
0
0
0
0
0
0
0
0
0
0
0
254,462
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6,174
0
262,286
Percent of Population Served
with At Least One Detection
> 0.2 ug/L
Total
0.000%
0.000%
0.000%
0.027%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.517%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.056%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.038%
0.475%
0.000%
0.145%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.221%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.067%
0.159%
0.000%
0.008%
sw
0.000%
0.000%
0.000%
0.049%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.006%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.530%
0.000%
0.225%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A39e. Heptachlor — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.1 ug/L
Total
0
0
0
1
0
0
0
2
0
0
0
0
0
0
0
2
0
1
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
221
0
0
0
0
0
0
2
3
0
234
GW
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
201
0
0
0
0
0
0
2
1
0
207
SW
0
0
0
1
0
0
0
1
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
20
0
0
0
0
0
0
0
2
0
27
Percent of Systems
with At Least One Detection
> 0.1 ug/L
Total
0.000%
0.000%
0.000%
0.105%
0.000%
0.000%
0.000%
0.995%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.823%
0.000%
0.116%
0.000%
0.000%
0.000%
0.000%
0.000%
0.085%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
28.701%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.142%
0.875%
0.000%
0.709%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.505%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.075%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.045%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
28.270%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.144%
0.510%
0.000%
0.691%
SW
0.000%
0.000%
0.000%
2.083%
0.000%
0.000%
0.000%
33.333%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.667%
0.000%
1.471%
0.000%
0.000%
0.000%
0.000%
0.000%
0.730%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
33.898%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.361%
0.000%
0.884%
Population Served by Systems
with At Least One Detection
> 0.1 ug/L
Total
0
0
0
1,650
0
0
0
140,165
0
0
0
0
0
0
0
261,029
0
1,710,000
0
0
0
0
0
80,218
0
0
0
0
0
0
0
0
0
0
1,698,527
0
0
0
0
0
0
7,492
6,499
0
3,905,580
GW
0
0
0
0
0
0
0
165
0
0
0
0
0
0
0
6,567
0
0
0
0
0
0
0
3,832
0
0
0
0
0
0
0
0
0
0
451,839
0
0
0
0
0
0
7,492
325
0
470,220
SW
0
0
0
1,650
0
0
0
140,000
0
0
0
0
0
0
0
254,462
0
1,710,000
0
0
0
0
0
76,386
0
0
0
0
0
0
0
0
0
0
1,246,688
0
0
0
0
0
0
0
6,174
0
3,435,360
Percent of Population Served
with At Least One Detection
> 0.1 ug/L
Total
0.000%
0.000%
0.000%
0.027%
0.000%
0.000%
0.000%
22.284%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.659%
0.000%
34.855%
0.000%
0.000%
0.000%
0.000%
0.000%
1.165%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
49.559%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.193%
0.475%
0.000%
2.117%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.047%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.749%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.221%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
56.446%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.342%
0.159%
0.000%
0.692%
SW
0.000%
0.000%
0.000%
0.049%
0.000%
0.000%
0.000%
49.751%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.006%
0.000%
42.770%
0.000%
0.000%
0.000%
0.000%
0.000%
1.483%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
47.461%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.530%
0.000%
2.948%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A40. Heptachlor Epoxide — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 0.2 ug/L
> 0.1 ug/L
> 0.2 ug/L
>0.1 ug/L
> 0.2 ug/L
> 0.1 ug/L
Total # Systems
Reporting
29,961
29,961
3,054
3,054
33,015
33,015
# Systems Exceeding
Threshold of Interest
5
11
1
4
6
15
% Systems Exceeding
Threshold of Interest
0.017%
0.037%
0.033%
0.131%
0.018%
0.045%
Total Pop. Served by
Systems Reporting
67,983,066
67,983,066
116,494,709
116,494,709
184,477,775
184,477,775
Total Pop. Served by
Systems Exceeding
Threshold of Interest
14,973
22,458
4,374
439,554
19,347
462,012
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.022%
0.033%
0.004%
0.377%
0.010%
0.250%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A40a. Heptachlor Epoxide — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
102
537
1,664
7,233
14,079
2,532
1,332
758
2,400
1,482
2,101
147
1,743
4,692
2,238
1,735
3,025
2,746
378
6,874
4,761
5,559
3,005
13,605
410
4,480
4,193
41
4,356
1,640
2,942
236
2,056
601
2,924
953
62
11,038
7,115
503
1,323
3,183
645
1,279
134,708
GW
53
404
1,423
5,668
8,153
1,827
1,014
729
2,333
1,402
2,004
131
1,485
3,951
2,074
444
2,237
1,728
339
6,422
4,620
4,691
2,697
12,470
344
4,131
3,874
33
4,106
1,201
2,202
97
1,573
414
2,532
844
12
5,279
5,927
178
1,120
3,090
336
959
106,551
SW
49
133
241
1,565
5,926
705
318
29
67
80
97
16
258
741
164
1,291
788
1,018
39
452
141
868
308
1,135
66
349
319
8
250
439
740
139
483
187
392
109
50
5,759
1,188
325
203
93
309
320
28,157
Percent of Samples
with Detections
Total
0.000%
0.372%
0.000%
0.069%
0.000%
0.000%
0.000%
0.132%
0.458%
0.067%
0.048%
0.000%
0.000%
0.171%
0.000%
0.288%
0.165%
0.036%
0.000%
0.000%
0.000%
0.000%
0.000%
0.875%
0.488%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.166%
0.000%
0.000%
0.000%
0.000%
0.000%
0.199%
0.076%
0.000%
2.171%
0.000%
0.132%
GW
0.000%
0.000%
0.000%
0.088%
0.000%
0.000%
0.000%
0.000%
0.471%
0.071%
0.050%
0.000%
0.000%
0.127%
0.000%
0.000%
0.089%
0.058%
0.000%
0.000%
0.000%
0.000%
0.000%
0.954%
0.581%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.242%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.089%
0.000%
2.679%
0.000%
0.148%
SW
0.000%
1.504%
0.000%
0.000%
0.000%
0.000%
0.000%
3.448%
0.000%
0.000%
0.000%
0.000%
0.000%
0.405%
0.000%
0.387%
0.381%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.308%
0.000%
0.000%
1.618%
0.000%
0.071%
Minimum Detect
Concentration (u.g/L)
Total
0.02
0.08
0.05
0.006
0.12
0.01
0.003
0.001
0.01
0.1
0.009
0.05
0.005
0.05
0.1
0.003
0.001
GW
0.08
0.006
0.12
0.01
0.003
0.02
0.1
0.009
0.05
0.005
0.1
0.003
0.003
SW
0.02
0.05
0.03
0.001
0.01
0.05
0.0042
0.001
Median Detect
Concentration (u.g/L)
Total
0.025
0.08
0.05
0.01
0.12
0.01
0.03
0.02
0.02
0.1
0.03
0.07
0.005
0.05
0.1
0.0042
0.03
GW
0.08
0.01
0.12
0.01
0.02
1.01
0.1
0.03
0.07
0.005
0.1
0.0042
0.03
SW
0.025
0.05
0.03
0.02
0.01
0.05
0.02
0.03
90th Percentile Detect
Concentration (u.g/L)
Total
0.03
0.1
0.05
0.01
0.12
0.01
0.08
0.2
2
0.1
0.06
0.09
0.005
0.05
0.1
0.5
0.1
GW
0.1
0.01
0.12
0.01
0.08
2
0.1
0.06
0.09
0.005
0.1
0.5
0.09
SW
0.03
0.05
0.04
0.2
0.11
0.05
0.5
0.2
Maximum Detect
Concentration (u.g/L)
Total
0.03
0.1
0.05
0.01
0.12
0.01
0.08
0.2
2
0.1
0.41
0.09
0.005
0.05
0.1
0.5
2
GW
0.1
0.01
0.12
0.01
0.08
2
0.1
0.41
0.09
0.005
0.1
0.5
2
SW
0.03
0.05
0.04
0.2
0.11
0.05
0.5
0.5
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A40b. Heptachlor Epoxide — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
15
177
450
949
1,629
808
657
201
1,314
297
112
95
724
1,371
1,402
243
644
861
248
2,934
1,287
1,471
813
2,365
209
762
1,237
36
695
291
1,347
49
1,084
86
769
261
12
2,002
427
182
442
1,410
343
304
33,015
GW
10
132
379
901
1,335
589
619
198
1,293
283
100
93
677
1,267
1,358
93
527
793
223
2,873
1,258
1,395
753
2,228
182
751
1,196
30
659
270
1,116
36
934
77
710
240
6
1,665
390
71
409
1,390
196
256
29,961
SW
5
45
71
48
294
219
38
3
21
14
12
2
47
104
44
150
117
68
25
61
29
76
60
137
27
11
41
6
36
21
231
13
150
9
59
21
6
337
37
111
33
20
147
48
3,054
Total Population Served by Systems
Reporting
Total
246,261
2,757,325
2,447,627
6,081,248
33,810,974
4,990,621
2,595,377
628,982
16,793,186
997,274
1,305,882
238,892
979,025
9,186,700
4,866,706
4,612,320
8,485,298
4,906,066
497,016
7,227,105
3,934,332
2,644,644
753,259
6,885,177
559,198
1,455,834
945,754
1,444,605
1,662,962
960,972
4,924,771
3,561,368
2,937,104
902,061
3,426,996
622,272
655,614
21,523,196
2,500,736
2,391,215
432,910
3,883,918
1,368,815
446,177
184,477,775
GW
14,306
644,737
905,863
2,710,657
12,089,844
523,712
261,490
347,582
14,554,010
305,252
1,251,254
99,507
742,349
2,986,303
2,546,970
375,460
1,682,916
907,959
126,396
2,047,249
2,684,691
1,700,183
360,590
1,733,551
253,973
679,354
395,955
143,223
1,400,064
271,081
981,494
147,360
572,354
162,083
800,213
263,101
145,112
5,759,696
1,667,550
30,317
181,746
2,192,174
204,156
129,229
67,983,066
SW
231,955
2,112,588
1,541,764
3,370,591
21,721,130
4,466,909
2,333,887
281,400
2,239,176
692,022
54,628
139,385
236,676
6,200,397
2,319,736
4,236,860
6,802,382
3,998,107
370,620
5,179,856
1,249,641
944,461
392,669
5,151,626
305,225
776,480
549,799
1,301,382
262,898
689,891
3,943,277
3,414,008
2,364,750
739,978
2,626,783
359,171
510,502
15,763,500
833,186
2,360,898
251,164
1,691,744
1,164,659
316,948
116,494,709
Percent of Systems
with At Least One Detection
Total
0.000%
0.565%
0.000%
0.211%
0.000%
0.000%
0.000%
0.498%
0.457%
0.337%
0.893%
0.000%
0.000%
0.584%
0.000%
1.646%
0.621%
0.116%
0.000%
0.000%
0.000%
0.000%
0.000%
1.142%
0.957%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.163%
0.000%
0.000%
0.000%
0.000%
0.000%
0.549%
0.226%
0.000%
3.499%
0.000%
0.221%
GW
0.000%
0.000%
0.000%
0.222%
0.000%
0.000%
0.000%
0.000%
0.464%
0.353%
1.000%
0.000%
0.000%
0.395%
0.000%
0.000%
0.380%
0.126%
0.000%
0.000%
0.000%
0.000%
0.000%
1.212%
1.099%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.299%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.244%
0.000%
4.592%
0.000%
0.194%
SW
0.000%
2.222%
0.000%
0.000%
0.000%
0.000%
0.000%
33.333%
0.000%
0.000%
0.000%
0.000%
0.000%
2.885%
0.000%
2.667%
1.709%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.901%
0.000%
0.000%
2.041%
0.000%
0.491%
Percent of Population Served
with At Least One Detection
Total
0.000%
1.416%
0.000%
0.837%
0.000%
0.000%
0.000%
16.737%
17.386%
0.003%
4.860%
0.000%
0.000%
0.637%
0.000%
7.137%
2.967%
0.124%
0.000%
0.000%
0.000%
0.000%
0.000%
0.737%
0.196%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.014%
0.000%
0.000%
0.000%
0.000%
0.000%
0.379%
0.071%
0.000%
0.829%
0.000%
2.112%
GW
0.000%
0.000%
0.000%
1.877%
0.000%
0.000%
0.000%
0.000%
20.061%
0.010%
5.072%
0.000%
0.000%
0.303%
0.000%
0.000%
1.726%
0.668%
0.000%
0.000%
0.000%
0.000%
0.000%
2.927%
0.432%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.080%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.169%
0.000%
0.971%
0.000%
4.608%
SW
0.000%
1.848%
0.000%
0.000%
0.000%
0.000%
0.000%
37.409%
0.000%
0.000%
0.000%
0.000%
0.000%
0.798%
0.000%
7.769%
3.274%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.384%
0.000%
0.000%
0.804%
0.000%
0.656%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A40c. Heptachlor Epoxide — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.2 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
6
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
5
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
Percent of Systems
with At Least One Detection
> 0.2 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.155%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.127%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.583%
0.000%
0.018%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.190%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.135%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.510%
0.000%
0.017%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.680%
0.000%
0.033%
Population Served by Systems
with At Least One Detection
> 0.2 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
13,849
0
0
0
0
0
0
799
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4,699
0
19,347
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
13,849
0
0
0
0
0
0
799
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
325
0
14,973
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4,374
0
4,374
Percent of Population Served
with At Least One Detection
> 0.2 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.163%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.012%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.343%
0.000%
0.010%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.823%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.046%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.159%
0.000%
0.022%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.376%
0.000%
0.004%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A40d. Heptachlor Epoxide — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.1 ug/L
Total
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
1
2
1
0
0
0
0
0
5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
3
0
15
GW
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
0
1
1
0
0
0
0
0
5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
11
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
4
Percent of Systems
with At Least One Detection
> 0.1 ug/L
Total
0.000%
0.000%
0.000%
0.105%
0.000%
0.000%
0.000%
0.000%
0.000%
0.337%
0.000%
0.000%
0.000%
0.000%
0.000%
0.412%
0.311%
0.116%
0.000%
0.000%
0.000%
0.000%
0.000%
0.211%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.226%
0.000%
0.875%
0.000%
0.045%
GW
0.000%
0.000%
0.000%
0.111%
0.000%
0.000%
0.000%
0.000%
0.000%
0.353%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.190%
0.126%
0.000%
0.000%
0.000%
0.000%
0.000%
0.224%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.244%
0.000%
0.510%
0.000%
0.037%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.667%
0.855%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.361%
0.000%
0.131%
Population Served by Systems
with At Least One Detection
> 0.1 ug/L
Total
0
0
0
245
0
0
0
0
0
31
0
0
0
0
0
254,462
192,767
6,062
0
0
0
0
0
1,638
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
308
0
6,499
0
462,012
GW
0
0
0
245
0
0
0
0
0
31
0
0
0
0
0
0
13,849
6,062
0
0
0
0
0
1,638
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
308
0
325
0
22,458
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
254,462
178,918
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6,174
0
439,554
Percent of Population Served
with At Least One Detection
> 0.1 ug/L
Total
0.000%
0.000%
0.000%
0.004%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.000%
0.000%
0.000%
5.517%
2.272%
0.124%
0.000%
0.000%
0.000%
0.000%
0.000%
0.024%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.071%
0.000%
0.475%
0.000%
0.250%
GW
0.000%
0.000%
0.000%
0.009%
0.000%
0.000%
0.000%
0.000%
0.000%
0.010%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.823%
0.668%
0.000%
0.000%
0.000%
0.000%
0.000%
0.094%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.169%
0.000%
0.159%
0.000%
0.033%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.006%
2.630%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.530%
0.000%
0.377%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A41. Hexachlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
>lug/L
> 0.5 ug/L
> 0.1 ug/L
>lug/L
> 0.5 ug/L
> 0.1 ug/L
> 1 ug/L
> 0.5 ug/L
> 0.1 ug/L
Total # Systems
Reporting
29,793
29,793
29,793
3,033
3,033
3,033
32,826
32,826
32,826
# Systems Exceeding
Threshold of Interest
3
12
18
1
34
39
4
46
57
% Systems Exceeding
Threshold of Interest
0.010%
0.040%
0.060%
0.033%
1.121%
1.286%
0.012%
0.140%
0.174%
Total Pop. Served by
Systems Reporting
67,957,193
67,957,193
67,957,193
116,167,630
116,167,630
116,167,630
184,124,823
184,124,823
184,124,823
Total Pop. Served by
Systems Exceeding
Threshold of Interest
2,273
18,893
23,963
2,671
597,830
912,379
4,944
616,723
936,342
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.003%
0.028%
0.035%
0.002%
0.515%
0.785%
0.003%
0.335%
0.509%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A41a. Hexachlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
107
518
1,664
6,943
14,410
2,542
1,320
1,357
2,393
1,483
2,101
151
2,299
3,865
2,250
2,148
3,046
2,775
456
6,886
4,761
5,563
3,009
13,604
65
4,480
4,193
41
4,357
1,620
2,926
234
2,057
923
2,907
956
62
11,038
7,101
503
1,317
3,185
627
1,269
135,512
GW
55
387
1,423
5,403
8,397
1,831
1,011
1,312
2,327
1,402
2,004
134
2,018
3,132
2,086
568
2,246
1,730
391
6,434
4,620
4,695
2,701
12,482
42
4,131
3,874
33
4,107
1,186
2,188
97
1,572
630
2,517
843
12
5,279
5,915
178
1,115
3,092
321
958
106,879
SW
52
131
241
1,540
6,013
711
309
45
66
81
97
17
281
733
164
1,580
800
1,045
65
452
141
868
308
1,122
23
349
319
8
250
434
738
137
485
293
390
113
50
5,759
1,186
325
202
93
306
311
28,633
Percent of Samples
with Detections
Total
0.000%
0.000%
0.000%
0.000%
0.007%
0.787%
0.303%
0.000%
0.418%
0.135%
0.000%
1.987%
0.000%
0.000%
0.000%
2.654%
0.492%
0.072%
0.000%
0.000%
0.021%
0.000%
0.033%
0.000%
0.000%
0.000%
0.000%
0.000%
0.023%
0.000%
0.000%
0.000%
0.097%
0.000%
0.034%
0.000%
0.000%
0.000%
0.000%
0.000%
0.152%
0.094%
2.233%
0.000%
0.103%
GW
0.000%
0.000%
0.000%
0.000%
0.012%
0.928%
0.396%
0.000%
0.430%
0.000%
0.000%
2.239%
0.000%
0.000%
0.000%
1.761%
0.401%
0.116%
0.000%
0.000%
0.022%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.024%
0.000%
0.000%
0.000%
0.064%
0.000%
0.040%
0.000%
0.000%
0.000%
0.000%
0.000%
0.090%
0.065%
2.804%
0.000%
0.067%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.422%
0.000%
0.000%
0.000%
2.469%
0.000%
0.000%
0.000%
0.000%
0.000%
2.975%
0.750%
0.000%
0.000%
0.000%
0.000%
0.000%
0.325%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.206%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.495%
1.075%
1.634%
0.000%
0.234%
Minimum Detect
Concentration (u.g/L)
Total
10
0.01
0.22
0.002
2
0.1
0.05
0.1
0.02
0.1
0.11
0.06
0.1
0.2
0.05
0.1
0.01
0.002
GW
10
0.01
0.22
0.002
0.1
0.5
0.1
0.02
0.1
0.06
0.1
0.2
0.05
0.1
0.01
0.002
SW
0.02
2
0.05
0.1
0.11
0.12
0.1
0.1
0.01
0.01
Median Detect
Concentration (u.g/L)
Total
10
0.02
0.22
0.002
2
0.1
0.5
0.1
0.02
0.1
0.11
0.06
0.11
0.2
0.075
0.1
0.01
0.1
GW
10
0.02
0.22
0.002
0.1
0.5
0.1
0.02
0.1
0.06
0.1
0.2
0.05
0.1
0.01
0.045
SW
0.05
2
0.5
0.1
0.11
0.12
0.1
0.1
0.1
0.5
90th Percentile Detect
Concentration (u.g/L)
Total
10
0.055
0.22
0.005
2
0.1
0.5
0.1
0.02
0.1
0.11
0.06
0.12
0.2
0.1
0.1
0.5
0.5
GW
10
0.04
0.22
0.005
0.1
2.85
0.1
0.02
0.1
0.06
0.1
0.2
0.05
0.1
5
0.5
SW
0.21
2
0.5
0.1
0.11
0.12
0.1
0.1
0.5
0.5
Maximum Detect
Concentration (u.g/L)
Total
10
0.21
0.22
0.008
2
0.1
5.2
0.1
0.02
0.1
0.11
0.06
0.12
0.2
0.1
0.1
5
10
GW
10
0.06
0.22
0.008
0.1
5.2
0.1
0.02
0.1
0.06
0.1
0.2
0.05
0.1
5
10
SW
0.21
2
0.5
0.1
0.11
0.12
0.1
0.1
0.5
2
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A41b. Hexachlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
18
175
450
939
1,674
808
654
247
1,315
297
112
95
856
1,132
1,402
243
643
861
269
2,930
1,287
1,471
813
2,365
27
762
1,237
36
695
292
1,343
46
1,083
105
770
261
12
2,002
426
182
442
1,410
335
304
32,826
GW
11
130
379
891
1,381
589
617
244
1,294
283
100
93
802
1,031
1,358
93
526
793
241
2,869
1,258
1,395
753
2,228
21
751
1,196
30
659
271
1,113
36
933
97
711
240
6
1,665
389
71
409
1,390
190
256
29,793
SW
7
45
71
48
293
219
37
3
21
14
12
2
54
101
44
150
117
68
28
61
29
76
60
137
6
11
41
6
36
21
230
10
150
8
59
21
6
337
37
111
33
20
145
48
3,033
Total Population Served by Systems
Reporting
Total
246,541
2,737,924
2,447,627
6,077,750
33,991,142
4,990,621
2,589,153
647,226
16,791,489
997,274
1,305,882
238,892
1,065,342
9,103,070
4,866,869
4,612,320
8,485,275
4,906,066
510,420
7,224,826
3,934,332
2,644,644
753,259
6,885,177
47,615
1,455,834
945,754
1,444,605
1,662,962
961,092
4,923,557
3,537,892
2,936,954
902,560
3,427,270
622,272
655,614
21,523,196
2,500,671
2,391,215
432,954
3,883,918
1,369,590
446,177
184,124,823
GW
14,331
625,336
905,863
2,707,159
12,276,578
523,712
261,886
365,826
14,552,313
305,252
1,251,254
99,507
818,934
2,907,148
2,547,133
375,460
1,682,893
907,959
134,500
2,044,970
2,684,691
1,700,183
360,590
1,733,551
40,586
679,354
395,955
143,223
1,400,064
271,201
981,867
147,360
572,204
163,122
800,487
263,101
145,112
5,759,696
1,667,485
30,317
181,790
2,192,174
205,837
129,229
67,957,193
SW
232,210
2,112,588
1,541,764
3,370,591
21,714,564
4,466,909
2,327,267
281,400
2,239,176
692,022
54,628
139,385
246,408
6,195,922
2,319,736
4,236,860
6,802,382
3,998,107
375,920
5,179,856
1,249,641
944,461
392,669
5,151,626
7,029
776,480
549,799
1,301,382
262,898
689,891
3,941,690
3,390,532
2,364,750
739,438
2,626,783
359,171
510,502
15,763,500
833,186
2,360,898
251,164
1,691,744
1,163,753
316,948
116,167,630
Percent of Systems
with At Least One Detection
Total
0.000%
0.000%
0.000%
0.000%
0.060%
2.104%
0.612%
0.000%
0.380%
0.337%
0.000%
3.158%
0.000%
0.000%
0.000%
18.930%
1.711%
0.116%
0.000%
0.000%
0.078%
0.000%
0.123%
0.000%
0.000%
0.000%
0.000%
0.000%
0.144%
0.000%
0.000%
0.000%
0.185%
0.000%
0.130%
0.000%
0.000%
0.000%
0.000%
0.000%
0.452%
0.213%
3.582%
0.000%
0.341%
GW
0.000%
0.000%
0.000%
0.000%
0.072%
2.377%
0.648%
0.000%
0.386%
0.000%
0.000%
3.226%
0.000%
0.000%
0.000%
10.753%
1.331%
0.126%
0.000%
0.000%
0.079%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.152%
0.000%
0.000%
0.000%
0.107%
0.000%
0.141%
0.000%
0.000%
0.000%
0.000%
0.000%
0.244%
0.144%
4.737%
0.000%
0.205%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
1.370%
0.000%
0.000%
0.000%
7.143%
0.000%
0.000%
0.000%
0.000%
0.000%
24.000%
3.419%
0.000%
0.000%
0.000%
0.000%
0.000%
1.667%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.667%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.030%
5.000%
2.069%
0.000%
1.682%
Percent of Population Served
with At Least One Detection
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.732%
0.164%
0.000%
15.509%
0.268%
0.000%
0.513%
0.000%
0.000%
0.000%
19.179%
3.198%
0.510%
0.000%
0.000%
0.025%
0.000%
5.108%
0.000%
0.000%
0.000%
0.000%
0.000%
0.144%
0.000%
0.000%
0.000%
0.565%
0.000%
0.004%
0.000%
0.000%
0.000%
0.000%
0.000%
1.432%
0.687%
0.828%
0.000%
2.136%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
1.441%
1.623%
0.000%
17.895%
0.000%
0.000%
1.231%
0.000%
0.000%
0.000%
4.932%
6.699%
2.753%
0.000%
0.000%
0.037%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.171%
0.000%
0.000%
0.000%
0.122%
0.000%
0.015%
0.000%
0.000%
0.000%
0.000%
0.000%
0.169%
0.243%
0.963%
0.000%
4.099%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.649%
0.000%
0.000%
0.000%
0.386%
0.000%
0.000%
0.000%
0.000%
0.000%
20.441%
2.332%
0.000%
0.000%
0.000%
0.000%
0.000%
9.799%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.672%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.345%
1.261%
0.804%
0.000%
0.988%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A41c. Hexachlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>lug/L
Total
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
4
GW
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
3
sw
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Percent of Systems
with At Least One Detection
> 1 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.060%
0.000%
0.000%
0.000%
0.000%
0.337%
0.000%
0.000%
0.000%
0.000%
0.000%
0.412%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.299%
0.000%
0.012%
GW
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.075%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.526%
0.000%
0.010%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
7.143%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.033%
Population Served by Systems
with At Least One Detection
>lug/L
Total
0
0
0
0
50
0
0
0
0
2,671
0
0
0
0
0
1,898
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
325
0
4,944
GW
0
0
0
0
50
0
0
0
0
0
0
0
0
0
0
1,898
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
325
0
2,273
SW
0
0
0
0
0
0
0
0
0
2,671
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2,671
Percent of Population Served
with At Least One Detection
>lug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.268%
0.000%
0.000%
0.000%
0.000%
0.000%
0.041%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.024%
0.000%
0.003%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.506%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.158%
0.000%
0.003%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.386%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A41d. Hexachlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.5 ug/L
Total
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
42
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
46
GW
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
10
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
12
sw
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
32
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
34
Percent of Systems
with At Least One Detection
> 0.5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.060%
0.000%
0.000%
0.000%
0.000%
0.337%
0.000%
0.000%
0.000%
0.000%
0.000%
17.284%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.597%
0.000%
0.140%
GW
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
10.753%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.526%
0.000%
0.040%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
7.143%
0.000%
0.000%
0.000%
0.000%
0.000%
21.333%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.690%
0.000%
1.121%
Population Served by Systems
with At Least One Detection
> 0.5 ug/L
Total
0
0
0
0
50
0
0
0
0
2,671
0
0
0
0
0
609,303
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4,699
0
616,723
GW
0
0
0
0
50
0
0
0
0
0
0
0
0
0
0
18,518
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
325
0
18,893
SW
0
0
0
0
0
0
0
0
0
2,671
0
0
0
0
0
590,785
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4,374
0
597,830
Percent of Population Served
with At Least One Detection
> 0.5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.268%
0.000%
0.000%
0.000%
0.000%
0.000%
13.210%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.343%
0.000%
0.335%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.932%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.158%
0.000%
0.028%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.386%
0.000%
0.000%
0.000%
0.000%
0.000%
13.944%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.376%
0.000%
0.515%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A41e. Hexachlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.1 ug/L
Total
0
0
0
0
1
1
4
0
0
1
0
0
0
0
0
43
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
2
0
1
0
0
0
0
0
0
0
3
0
57
GW
0
0
0
0
1
0
4
0
0
0
0
0
0
0
0
10
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
1
0
18
sw
0
0
0
0
0
1
0
0
0
1
0
0
0
0
0
33
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
2
0
39
Percent of Systems
with At Least One Detection
> 0.1 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.060%
0.124%
0.612%
0.000%
0.000%
0.337%
0.000%
0.000%
0.000%
0.000%
0.000%
17.695%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.123%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.185%
0.000%
0.130%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.896%
0.000%
0.174%
GW
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.648%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
10.753%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.107%
0.000%
0.141%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.526%
0.000%
0.060%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.457%
0.000%
0.000%
0.000%
7.143%
0.000%
0.000%
0.000%
0.000%
0.000%
22.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.667%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.667%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.379%
0.000%
1.286%
Population Served by Systems
with At Least One Detection
> 0.1 ug/L
Total
0
0
0
0
50
3,930
4,250
0
0
2,671
0
0
0
0
0
863,765
0
0
0
0
0
0
38,477
0
0
0
0
0
0
0
0
0
16,580
0
120
0
0
0
0
0
0
0
6,499
0
936,342
GW
0
0
0
0
50
0
4,250
0
0
0
0
0
0
0
0
18,518
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
700
0
120
0
0
0
0
0
0
0
325
0
23,963
SW
0
0
0
0
0
3,930
0
0
0
2,671
0
0
0
0
0
845,247
0
0
0
0
0
0
38,477
0
0
0
0
0
0
0
0
0
15,880
0
0
0
0
0
0
0
0
0
6,174
0
912,379
Percent of Population Served
with At Least One Detection
> 0.1 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.079%
0.164%
0.000%
0.000%
0.268%
0.000%
0.000%
0.000%
0.000%
0.000%
18.727%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.108%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.565%
0.000%
0.004%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.475%
0.000%
0.509%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.623%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.932%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.122%
0.000%
0.015%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.158%
0.000%
0.035%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.088%
0.000%
0.000%
0.000%
0.386%
0.000%
0.000%
0.000%
0.000%
0.000%
19.950%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
9.799%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.672%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.531%
0.000%
0.785%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A42. Hexachlorocyclopentadiene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 50 ug/L
> 40 u.g/L
> 25 ug/L
> 50 ug/L
> 40 ug/L
> 25 ug/L
> 50 ug/L
> 40 u.g/L
> 25 ug/L
Total # Systems
Reporting
29,767
29,767
29,767
3,034
3,034
3,034
32,801
32,801
32,801
# Systems Exceeding
Threshold of Interest
0
0
0
0
0
0
0
0
0
% Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Total Pop. Served by
Systems Reporting
67,981,852
67,981,852
67,981,852
116,756,578
116,756,578
116,756,578
184,738,430
184,738,430
184,738,430
Total Pop. Served by
Systems Exceeding
Threshold of Interest
0
0
0
0
0
0
0
0
0
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A42a. Hexachlorocyclopentadiene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
112
549
1,658
7,042
14,048
2,571
1,319
1,350
2,428
1,482
2,101
149
2,298
3,898
2,242
2,153
3,014
2,794
456
6,875
4,761
5,563
3,010
13,576
67
4,480
4,197
40
4,360
1,621
2,921
229
2,051
923
2,880
952
63
11,038
7,108
505
1,314
3,184
650
1,258
135,290
GW
59
390
1,423
5,492
8,117
1,837
1,010
1,305
2,358
1,402
2,004
132
2,017
3,129
2,070
570
2,227
1,735
391
6,423
4,620
4,695
2,699
12,453
42
4,131
3,875
33
4,108
1,189
2,184
95
1,567
630
2,490
843
10
5,279
5,920
178
1,112
3,091
338
948
106,621
SW
53
159
235
1,550
5,931
734
309
45
70
80
97
17
281
769
172
1,583
787
1,059
65
452
141
868
311
1,123
25
349
322
7
252
432
737
134
484
293
390
109
53
5,759
1,188
327
202
93
312
310
28,669
Percent of Samples
with Detections
Total
0.893%
0.000%
2.413%
0.043%
0.014%
2.334%
0.227%
0.074%
1.277%
0.067%
1.523%
0.000%
0.131%
0.000%
0.089%
3.019%
0.398%
0.322%
1.096%
0.000%
0.021%
0.000%
0.233%
0.243%
0.000%
0.000%
0.262%
2.500%
0.023%
0.062%
0.000%
0.000%
0.098%
0.000%
0.313%
0.000%
0.000%
0.109%
0.070%
0.000%
0.228%
0.000%
2.154%
0.477%
0.278%
GW
0.000%
0.000%
0.000%
0.018%
0.012%
0.544%
0.297%
0.077%
1.315%
0.000%
0.200%
0.000%
0.000%
0.000%
0.000%
1.930%
0.090%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.104%
0.000%
0.000%
0.026%
3.030%
0.024%
0.000%
0.000%
0.000%
0.000%
0.000%
0.361%
0.000%
0.000%
0.019%
0.068%
0.000%
0.090%
0.000%
2.663%
0.000%
0.098%
SW
1.887%
0.000%
17.021%
0.129%
0.017%
6.812%
0.000%
0.000%
0.000%
1.250%
28.866%
0.000%
1.068%
0.000%
1.163%
3.411%
1.271%
0.850%
7.692%
0.000%
0.709%
0.000%
2.251%
1.781%
0.000%
0.000%
3.106%
0.000%
0.000%
0.231%
0.000%
0.000%
0.413%
0.000%
0.000%
0.000%
0.000%
0.191%
0.084%
0.000%
0.990%
0.000%
1.603%
1.935%
0.949%
Minimum Detect
Concentration (u.g/L)
Total
0.13
0.01
0.11
0.04
0.03
0.22
1
0.005
0.09
0.05
0.07
0.1
0.001
0.04
0.01
0.16
0.4
0.05
0.1
0.1
0.19
0.7
0.07
0.1
10
0.3
0.3
0.1
0.05
0.03
0.001
GW
0.11
3.1
0.03
0.22
1
0.005
0.05
0.11
0.1
0.1
0.6
0.19
0.7
10
0.31
0.3
0.2
0.05
0.005
SW
0.13
0.01
0.11
0.04
0.04
0.09
0.05
0.07
0.1
0.001
0.04
0.01
0.16
0.4
0.05
0.11
0.1
0.07
0.1
0.3
0.4
0.1
0.05
0.03
0.001
Median Detect
Concentration (u.g/L)
Total
0.13
0.02
0.11
1.57
0.16
0.22
1
0.25
0.09
0.08
0.1
0.15
10
0.1
0.1
0.22
0.4
0.11
0.19
0.1
0.19
0.7
0.07
0.115
10
0.38
0.3
0.1
0.05
0.14
0.15
GW
0.11
3.1
0.07
0.22
1
0.25
0.065
10
0.1
0.29
0.6
0.19
0.7
10
0.31
0.3
0.2
0.05
0.275
SW
0.13
0.02
0.405
0.04
0.2
0.09
0.08
0.1
0.15
10
0.085
0.1
0.22
0.4
0.11
0.155
0.1
0.07
0.115
0.39
0.4
0.1
0.1
0.14
0.13
90th Percentile Detect
Concentration (u.g/L)
Total
0.13
0.1
0.7
3.1
0.775
0.22
1
0.97
0.09
0.14
0.5
0.2
10
0.14
0.5
0.58
0.4
0.2
0.31
0.38
0.19
0.7
0.07
0.13
10
0.69
0.4
0.2
0.5
0.25
10
GW
0.11
3.1
0.465
0.22
1
0.97
0.08
10
0.1
0.4
0.6
0.19
0.7
10
0.31
0.3
0.2
0.53
10
SW
0.13
0.1
0.7
0.04
0.8
0.09
0.14
0.5
0.2
10
0.17
0.5
0.58
0.4
0.2
0.235
0.34
0.07
0.13
0.69
0.4
0.1
0.5
0.25
10
Maximum Detect
Concentration (u.g/L)
Total
0.13
0.5
0.7
3.1
1.7
0.22
1
1.6
0.09
0.16
0.5
0.2
15
0.2
0.5
0.58
0.4
0.2
1.86
0.6
0.19
0.7
0.07
0.13
10
0.71
0.4
0.2
0.53
0.25
15
GW
0.11
3.1
0.73
0.22
1
1.6
0.08
15
0.1
1.86
0.6
0.19
0.7
10
0.31
0.3
0.2
0.53
15
SW
0.13
0.5
0.7
0.04
1.7
0.09
0.16
0.5
0.2
10
0.2
0.5
0.58
0.4
0.2
0.28
0.38
0.07
0.13
0.71
0.4
0.1
0.5
0.25
10
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A42b. Hexachlorocyclopentadiene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
18
177
450
937
1,640
808
654
247
1,317
297
112
96
855
1,132
1,401
243
642
861
269
2,934
1,287
1,471
813
2,365
26
762
1,237
36
695
292
1,343
46
1,083
105
767
261
11
2,002
426
184
441
1,410
344
304
32,801
GW
11
131
379
889
1,353
589
617
244
1,294
283
100
94
801
1,031
1,357
93
525
793
241
2,873
1,258
1,395
753
2,228
20
751
1,196
30
659
271
1,113
36
933
97
708
240
5
1,665
389
71
408
1,390
197
256
29,767
SW
7
46
71
48
287
219
37
3
23
14
12
2
54
101
44
150
117
68
28
61
29
76
60
137
6
11
41
6
36
21
230
10
150
8
59
21
6
337
37
113
33
20
147
48
3,034
Total Population Served by Systems
Reporting
Total
246,541
3,492,436
2,447,627
6,069,368
33,859,665
4,990,621
2,589,153
647,226
16,795,482
997,274
1,305,882
238,964
1,065,312
9,103,070
4,866,289
4,612,320
8,484,975
4,906,066
510,420
7,227,105
3,934,332
2,644,644
753,259
6,885,177
45,611
1,455,834
945,754
1,444,605
1,662,962
961,092
4,923,707
3,537,892
2,936,954
902,560
3,426,157
622,272
650,577
21,523,196
2,500,671
2,391,419
432,879
3,883,918
1,370,985
446,177
184,738,430
GW
14,331
718,414
905,863
2,698,777
12,218,039
523,712
261,886
365,826
14,552,477
305,252
1,251,254
99,579
818,904
2,907,148
2,546,553
375,460
1,682,593
907,959
134,500
2,047,249
2,684,691
1,700,183
360,590
1,733,551
38,582
679,354
395,955
143,223
1,400,064
271,201
982,017
147,360
572,204
163,122
799,374
263,101
144,562
5,759,696
1,667,485
30,317
181,715
2,192,174
206,326
129,229
67,981,852
SW
232,210
2,774,022
1,541,764
3,370,591
21,641,626
4,466,909
2,327,267
281,400
2,243,005
692,022
54,628
139,385
246,408
6,195,922
2,319,736
4,236,860
6,802,382
3,998,107
375,920
5,179,856
1,249,641
944,461
392,669
5,151,626
7,029
776,480
549,799
1,301,382
262,898
689,891
3,941,690
3,390,532
2,364,750
739,438
2,626,783
359,171
506,015
15,763,500
833,186
2,361,102
251,164
1,691,744
1,164,659
316,948
116,756,578
Percent of Systems
with At Least One Detection
Total
5.556%
0.000%
5.333%
0.320%
0.122%
3.960%
0.459%
0.405%
1.139%
0.337%
4.464%
0.000%
0.234%
0.000%
0.071%
20.988%
1.246%
0.465%
1.115%
0.000%
0.078%
0.000%
0.369%
0.846%
0.000%
0.000%
0.404%
2.778%
0.144%
0.342%
0.000%
0.000%
0.185%
0.000%
0.913%
0.000%
0.000%
0.450%
0.469%
0.000%
0.454%
0.000%
3.488%
0.987%
0.686%
GW
0.000%
0.000%
0.000%
0.112%
0.074%
1.698%
0.486%
0.410%
1.159%
0.000%
2.000%
0.000%
0.000%
0.000%
0.000%
11.828%
0.381%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.449%
0.000%
0.000%
0.084%
3.333%
0.152%
0.000%
0.000%
0.000%
0.000%
0.000%
0.989%
0.000%
0.000%
0.060%
0.257%
0.000%
0.245%
0.000%
4.569%
0.000%
0.262%
SW
14.286%
0.000%
33.803%
4.167%
0.348%
10.046%
0.000%
0.000%
0.000%
7.143%
25.000%
0.000%
3.704%
0.000%
2.273%
26.667%
5.128%
5.882%
10.714%
0.000%
3.448%
0.000%
5.000%
7.299%
0.000%
0.000%
9.756%
0.000%
0.000%
4.762%
0.000%
0.000%
1.333%
0.000%
0.000%
0.000%
0.000%
2.374%
2.703%
0.000%
3.030%
0.000%
2.041%
6.250%
4.845%
Percent of Population Served
with At Least One Detection
Total
1.254%
0.000%
21.686%
39.044%
0.016%
5.929%
0.144%
0.010%
16.924%
18.049%
2.051%
0.000%
17.469%
0.000%
0.033%
22.093%
45.408%
70.920%
1.622%
0.000%
0.001%
0.000%
5.261%
4.541%
0.000%
0.000%
6.598%
0.026%
0.024%
5.879%
0.000%
0.000%
0.011%
0.000%
0.018%
0.000%
0.000%
0.240%
0.937%
0.000%
1.432%
0.000%
0.827%
0.246%
8.321%
GW
0.000%
0.000%
0.000%
25.054%
0.046%
0.481%
1.423%
0.018%
19.533%
0.000%
1.498%
0.000%
0.000%
0.000%
0.000%
7.186%
0.769%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
11.510%
0.000%
0.000%
4.799%
0.262%
0.029%
0.000%
0.000%
0.000%
0.000%
0.000%
0.077%
0.000%
0.000%
0.003%
1.379%
0.000%
0.169%
0.000%
0.961%
0.000%
5.641%
SW
1.332%
0.000%
34.428%
50.246%
0.000%
6.568%
0.000%
0.000%
0.000%
26.011%
14.707%
0.000%
75.524%
0.000%
0.069%
23.414%
56.449%
87.026%
2.203%
0.000%
0.004%
0.000%
10.092%
2.196%
0.000%
0.000%
7.894%
0.000%
0.000%
8.190%
0.000%
0.000%
0.014%
0.000%
0.000%
0.000%
0.000%
0.327%
0.052%
0.000%
2.345%
0.000%
0.804%
0.346%
9.882%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A42c. Hexachlorocyclopentadiene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 50 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 50 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 50 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 50 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A42d. Hexachlorocyclopentadiene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 40 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 40 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 40 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 40 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A42e. Hexachlorocyclopentadiene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 25 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 25 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 25 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 25 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A43. Llndane (gamma-Hexachlorocyclohexane) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 0.2 ug/L
> 0.1 ug/L
> 0.2 ug/L
> 0.1 ug/L
> 0.2 ug/L
> 0.1 ug/L
Total # Systems
Reporting
30,143
30,143
3,122
3,122
33,265
33,265
# Systems Exceeding
Threshold of Interest
2
11
1
4
3
15
% Systems Exceeding
Threshold of Interest
0.007%
0.036%
0.032%
0.128%
0.009%
0.045%
Total Pop. Served by
Systems Reporting
68,277,043
68,277,043
118,981,892
118,981,892
187,258,935
187,258,935
Total Pop. Served by
Systems Exceeding
Threshold of Interest
462
36,143
4,374
512,063
4,836
548,206
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.001%
0.053%
0.004%
0.430%
0.003%
0.293%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A43a. Llndane (gamma-Hexachlorocyclohexane) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
99
562
1,664
7,221
14,361
2,538
1,602
758
2,392
1,482
1,948
149
1,739
4,684
2,247
1,753
3,033
2,720
456
6,875
4,761
5,559
3,002
13,616
407
4,480
4,193
41
4,355
1,633
2,926
669
2,055
601
2,929
953
79
11,038
7,115
459
1,322
3,183
643
1,283
135,585
GW
50
424
1,423
5,643
8,298
1,837
1,015
729
2,325
1,402
1,851
132
1,482
3,949
2,084
445
2,244
1,726
391
6,423
4,620
4,691
2,694
12,479
341
4,131
3,874
33
4,105
1,194
2,192
433
1,570
414
2,538
844
13
5,279
5,927
165
1,119
3,090
335
963
106,917
SW
49
138
241
1,578
6,063
701
587
29
67
80
97
17
257
735
163
1,308
789
994
65
452
141
868
308
1,137
66
349
319
8
250
439
734
236
485
187
391
109
66
5,759
1,188
294
203
93
308
320
28,668
Percent of Samples
with Detections
Total
0.000%
0.356%
0.000%
0.028%
0.007%
0.039%
0.499%
1.319%
0.502%
0.000%
0.000%
0.000%
0.000%
0.064%
0.178%
0.342%
0.165%
0.294%
0.000%
0.000%
0.000%
0.000%
0.000%
0.492%
0.000%
0.022%
0.000%
2.439%
0.000%
0.000%
0.000%
0.000%
0.049%
0.166%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.076%
0.000%
2.022%
0.000%
0.108%
GW
0.000%
0.236%
0.000%
0.035%
0.012%
0.054%
0.099%
1.372%
0.516%
0.000%
0.000%
0.000%
0.000%
0.076%
0.192%
0.225%
0.045%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.537%
0.000%
0.024%
0.000%
3.030%
0.000%
0.000%
0.000%
0.000%
0.000%
0.242%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.089%
0.000%
2.687%
0.000%
0.109%
SW
0.000%
0.725%
0.000%
0.000%
0.000%
0.000%
1.193%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.382%
0.507%
0.805%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.206%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.299%
0.000%
0.105%
Minimum Detect
Concentration (u.g/L)
Total
0.15
0.02
0.1
0.02
0.01
0.01
0.003
0.002
0.02
0.001
0.02
0.01
0.02
0.08
0.05
0.02
0.02
0.06
0.004
0.001
GW
0.16
0.02
0.1
0.02
0.05
0.01
0.003
0.002
0.02
0.01
0.02
0.01
0.02
0.08
0.05
0.02
0.02
0.06
0.004
0.002
SW
0.15
0.01
0.001
0.02
0.01
0.02
0.0044
0.001
Median Detect
Concentration (u.g/L)
Total
0.155
0.06
0.1
0.02
0.05
0.025
0.003
0.02
0.05
0.11
0.02
0.03
0.06
0.08
0.05
0.02
0.02
0.06
0.0044
0.04
GW
0.16
0.06
0.1
0.02
0.05
0.025
0.003
0.02
0.05
0.01
0.02
0.03
0.06
0.08
0.05
0.02
0.02
0.06
0.0044
0.04
SW
0.15
0.05
0.2
0.02
0.03
0.02
0.0122
0.03
90th Percentile Detect
Concentration (u.g/L)
Total
0.16
0.1
0.1
0.02
0.05
0.075
0.006
0.05
0.07
0.2
0.07
0.1
0.12
0.08
0.05
0.02
0.02
0.06
0.5
0.11
GW
0.16
0.1
0.1
0.02
0.05
0.075
0.006
0.05
0.07
0.01
0.02
0.1
0.12
0.08
0.05
0.02
0.02
0.06
0.5
0.11
SW
0.15
0.05
0.2
0.07
0.1
0.02
0.5
0.2
Maximum Detect
Concentration (u.g/L)
Total
0.16
0.1
0.1
0.02
0.05
0.1
0.06
0.05
0.07
0.2
0.07
0.1
0.69
0.08
0.05
0.02
0.02
0.06
0.5
0.69
GW
0.16
0.1
0.1
0.02
0.05
0.1
0.06
0.05
0.07
0.01
0.02
0.1
0.69
0.08
0.05
0.02
0.02
0.06
0.5
0.69
SW
0.15
0.05
0.2
0.07
0.1
0.02
0.5
0.5
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A43b. Llndane (gamma-Hexachlorocyclohexane) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
14
178
450
948
1,645
811
657
201
1,315
297
100
96
723
1,371
1,402
243
644
861
269
2,935
1,287
1,471
813
2,365
208
762
1,237
36
695
288
1,344
280
1,084
86
770
261
19
2,002
428
171
442
1,410
342
304
33,265
GW
9
132
379
900
1,351
592
619
198
1,294
283
88
94
676
1,267
1,358
93
527
793
241
2,874
1,258
1,395
753
2,228
181
751
1,196
30
659
267
1,113
202
934
77
711
240
7
1,665
391
67
409
1,390
195
256
30,143
SW
5
46
71
48
294
219
38
3
21
14
12
2
47
104
44
150
117
68
28
61
29
76
60
137
27
11
41
6
36
21
231
78
150
9
59
21
12
337
37
104
33
20
147
48
3,122
Total Population Served by Systems
Reporting
Total
246,238
2,786,308
2,447,627
6,081,133
33,787,721
4,991,819
2,595,377
628,982
16,791,489
997,274
1,256,886
238,964
979,385
9,186,700
4,866,706
4,612,320
8,485,298
4,906,066
510,420
7,227,231
3,934,332
2,644,644
753,259
6,885,177
559,142
1,455,834
945,754
1,444,605
1,662,962
959,822
4,921,386
6,539,484
2,937,354
902,061
3,427,270
622,272
752,805
21,523,196
2,502,301
2,129,631
432,910
3,883,918
1,368,695
446,177
187,258,935
GW
14,248
640,232
905,863
2,710,542
12,066,131
524,910
261,490
347,582
14,552,313
305,252
1,202,258
99,579
742,709
2,986,303
2,546,970
375,460
1,682,916
907,959
134,500
2,047,375
2,684,691
1,700,183
360,590
1,733,551
253,917
679,354
395,955
143,223
1,400,064
269,931
978,109
514,829
572,604
162,083
800,487
263,101
145,338
5,759,696
1,669,115
28,445
181,746
2,192,174
204,036
129,229
68,277,043
SW
231,990
2,146,076
1,541,764
3,370,591
21,721,590
4,466,909
2,333,887
281,400
2,239,176
692,022
54,628
139,385
236,676
6,200,397
2,319,736
4,236,860
6,802,382
3,998,107
375,920
5,179,856
1,249,641
944,461
392,669
5,151,626
305,225
776,480
549,799
1,301,382
262,898
689,891
3,943,277
6,024,655
2,364,750
739,978
2,626,783
359,171
607,467
15,763,500
833,186
2,101,186
251,164
1,691,744
1,164,659
316,948
118,981,892
Percent of Systems
with At Least One Detection
Total
0.000%
1.124%
0.000%
0.211%
0.061%
0.123%
0.761%
0.995%
0.456%
0.000%
0.000%
0.000%
0.000%
0.219%
0.214%
1.646%
0.621%
0.465%
0.000%
0.000%
0.000%
0.000%
0.000%
1.311%
0.000%
0.131%
0.000%
2.778%
0.000%
0.000%
0.000%
0.000%
0.092%
1.163%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.226%
0.000%
3.216%
0.000%
0.253%
GW
0.000%
0.758%
0.000%
0.222%
0.074%
0.169%
0.162%
1.010%
0.464%
0.000%
0.000%
0.000%
0.000%
0.237%
0.221%
1.075%
0.190%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.391%
0.000%
0.133%
0.000%
3.333%
0.000%
0.000%
0.000%
0.000%
0.000%
1.299%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.244%
0.000%
4.615%
0.000%
0.219%
SW
0.000%
2.174%
0.000%
0.000%
0.000%
0.000%
10.526%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.000%
2.564%
5.882%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.667%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.361%
0.000%
0.577%
Percent of Population Served
with At Least One Detection
Total
0.000%
8.924%
0.000%
0.012%
0.020%
0.006%
17.147%
11.717%
15.540%
0.000%
0.000%
0.000%
0.000%
0.170%
0.141%
7.746%
1.923%
71.708%
0.000%
0.000%
0.000%
0.000%
0.000%
1.084%
0.000%
0.005%
0.000%
2.284%
0.000%
0.000%
0.000%
0.000%
0.417%
0.510%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.071%
0.000%
0.697%
0.000%
4.048%
GW
0.000%
0.459%
0.000%
0.028%
0.055%
0.054%
0.140%
21.202%
17.931%
0.000%
0.000%
0.000%
0.000%
0.524%
0.268%
0.058%
0.903%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.303%
0.000%
0.012%
0.000%
23.041%
0.000%
0.000%
0.000%
0.000%
0.000%
2.838%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.169%
0.000%
0.971%
0.000%
4.169%
SW
0.000%
11.450%
0.000%
0.000%
0.000%
0.000%
19.052%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
8.427%
2.175%
87.992%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.518%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.649%
0.000%
3.978%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A43c. Llndane (gamma-Hexachlorocyclohexane) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.2 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
3
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
2
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
Percent of Systems
with At Least One Detection
> 0.2 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.042%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.585%
0.000%
0.009%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.045%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.513%
0.000%
0.007%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.680%
0.000%
0.032%
Population Served by Systems
with At Least One Detection
> 0.2 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
137
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4,699
0
4,836
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
137
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
325
0
462
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4,374
0
4,374
Percent of Population Served
with At Least One Detection
> 0.2 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.343%
0.000%
0.003%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.008%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.159%
0.000%
0.001%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.376%
0.000%
0.004%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A43d. Llndane (gamma-Hexachlorocyclohexane) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.1 ug/L
Total
0
2
0
1
1
0
0
1
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
15
GW
0
1
0
1
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
11
sw
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
4
Percent of Systems
with At Least One Detection
> 0.1 ug/L
Total
0.000%
1.124%
0.000%
0.105%
0.061%
0.000%
0.000%
0.498%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.412%
0.000%
0.116%
0.000%
0.000%
0.000%
0.000%
0.000%
0.254%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.585%
0.000%
0.045%
GW
0.000%
0.758%
0.000%
0.111%
0.074%
0.000%
0.000%
0.505%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.269%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.513%
0.000%
0.036%
sw
0.000%
2.174%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.667%
0.000%
1.471%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.680%
0.000%
0.128%
Population Served by Systems
with At Least One Detection
> 0.1 ug/L
Total
0
248,664
0
245
6,650
0
0
4,800
0
0
0
0
0
0
0
254,462
0
7,500
0
0
0
0
0
21,186
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4,699
0
548,206
GW
0
2,937
0
245
6,650
0
0
4,800
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
21,186
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
325
0
36,143
SW
0
245,727
0
0
0
0
0
0
0
0
0
0
0
0
0
254,462
0
7,500
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4,374
0
512,063
Percent of Population Served
with At Least One Detection
> 0.1 ug/L
Total
0.000%
8.924%
0.000%
0.004%
0.020%
0.000%
0.000%
0.763%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.517%
0.000%
0.153%
0.000%
0.000%
0.000%
0.000%
0.000%
0.308%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.343%
0.000%
0.293%
GW
0.000%
0.459%
0.000%
0.009%
0.055%
0.000%
0.000%
1.381%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.222%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.159%
0.000%
0.053%
sw
0.000%
11.450%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.006%
0.000%
0.188%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.376%
0.000%
0.430%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A44. Mercury (Inorganic) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold of
Interest
> 0.002 mg/L
> 0.001 mg/L
> 0.002 mg/L
> 0.001 mg/L
> 0.002 mg/L
> 0.001 mg/L
Total # Systems
Reporting
44,863
44,863
3,996
3,996
48,859
48,859
# Systems Exceeding
Threshold of Interest
64
223
18
51
82
274
% Systems Exceeding
Threshold of Interest
0.143%
0.497%
0.450%
1.276%
0.168%
0.561%
Total Pop. Served by
Systems Reporting
85,514,854
85,514,854
144,338,525
144,338,525
229,853,379
229,853,379
Total Pop. Served by
Systems Exceeding
Threshold of Interest
617,666
2,282,255
1,973,654
10,552,870
2,591,320
12,835,125
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.722%
2.669%
1.367%
7.311%
1.127%
5.584%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A44a. Mercury (Inorganic) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
866
2,683
2,186
6,219
34,622
4,378
2,589
762
2,149
3,646
1,178
1,491
2,664
3,420
4,699
1,758
2,982
5,096
2,702
5,591
3,207
5,704
2,751
9,222
348
1,937
2,928
6,722
3,508
1,836
3,398
4,553
420
1,320
904
3,403
388
1,631
14,712
6,931
2,804
2,059
7,023
1,116
1,123
181,629
GW
613
1,829
1,529
4,855
20,422
2,321
1,866
709
2,080
3,005
1,116
1,228
2,386
3,017
4,216
532
2,022
3,986
2,302
5,436
3,159
4,923
2,472
7,786
304
1,849
2,764
6,004
3,182
1,305
2,546
3,927
346
957
674
2,940
359
482
12,141
5,432
2,195
1,738
6,851
423
875
141,104
SW
253
854
657
1,364
14,200
2,057
723
53
69
641
62
263
278
403
483
1,226
960
1,110
400
155
48
781
279
1,436
44
88
164
718
326
531
852
626
74
363
230
463
29
1,149
2,571
1,499
609
321
172
693
248
40,525
Percent of Samples
with Detections
Total
1.963%
1.416%
0.091%
1.769%
1.765%
1.256%
1.159%
2.493%
5.398%
0.082%
0.170%
0.671%
1.051%
0.526%
1.000%
4.039%
1.979%
0.608%
1.925%
4.525%
0.904%
0.666%
0.327%
1.247%
0.000%
0.000%
0.376%
5.356%
1.226%
1.634%
0.971%
1.340%
0.476%
0.455%
0.221%
2.116%
1.289%
1.165%
0.387%
5.194%
0.713%
0.826%
4.841%
3.495%
0.890%
1.789%
GW
2.121%
1.093%
0.131%
1.833%
2.155%
0.991%
1.447%
2.539%
5.481%
0.033%
0.179%
0.814%
1.006%
0.464%
0.783%
2.820%
2.324%
0.477%
2.215%
4.507%
0.823%
0.711%
0.324%
1.259%
0.000%
0.000%
0.398%
5.763%
1.288%
1.686%
0.943%
1.477%
0.578%
0.627%
0.297%
1.259%
1.114%
0.415%
0.387%
5.468%
0.774%
0.921%
4.904%
4.965%
1.029%
1.894%
SW
1.581%
2.108%
0.000%
1.540%
1.204%
1.556%
0.415%
1.887%
2.899%
0.312%
0.000%
0.000%
1.439%
0.993%
2.899%
4.568%
1.250%
1.081%
0.250%
5.161%
6.250%
0.384%
0.358%
1.184%
0.000%
0.000%
0.000%
1.950%
0.613%
1.507%
1.056%
0.479%
0.000%
0.000%
0.000%
7.559%
3.448%
1.480%
0.389%
4.203%
0.493%
0.312%
2.326%
2.597%
0.403%
1.426%
Minimum Detect
Concentration (mg/L)
Total
0.0002
0.00003
0.0005
0.0001
2.1E-05
0.00005
0.00009
0.0001
0.0001
0.00026
0.0006
0.0002
0.0001
6.5E-05
0.0001
0.0001
0.00004
0.0001
0.00005
0.00003
0.00003
0.00004
0.0002
0.00006
0.0001
0.00004
0.0002
0.0001
0.0002
0.00012
0.00005
0.0002
0.0025
0.0002
0.0002
0.00009
0.0002
0.0001
0.0002
0.00003
2.5E-05
9.3E-05
0.0001
2.1E-05
GW
0.0002
0.00006
0.0005
0.0001
2.1E-05
0.0001
0.00009
0.0001
0.0001
0.0016
0.0006
0.0002
0.0001
6.5E-05
0.0001
0.0002
0.00004
0.0002
0.00005
0.00003
0.00003
0.00004
0.0002
0.0001
0.0001
0.00004
0.0002
0.0001
0.0002
0.00012
0.00005
0.0002
0.0025
0.0002
0.0002
0.0002
0.0002
0.0001
0.0002
0.00003
2.5E-05
9.3E-05
0.0001
2.1E-05
SW
0.0002
0.00003
0.00012
2.2E-05
0.00005
0.0002
0.0001
0.0001
0.00026
0.0002
0.00011
0.0001
0.0001
0.0002
0.0001
0.0001
0.00003
0.00003
0.00016
0.0002
0.00006
0.00004
0.0005
0.0002
0.0002
0.00021
0.00032
0.0011
0.00009
0.00021
0.0001
0.0002
0.0003
0.0001
9.3E-05
0.003
2.2E-05
Median Detect
Concentration (mg/L)
Total
0.0003
0.0005
0.0005
0.0003
0.00011
0.0002
0.0003
0.0005
0.0002
0.0016
0.00065
0.00037
0.00042
0.0002
0.00023
0.0003
0.00027
0.0005
0.0001
0.00004
0.00006
0.00028
0.0003
0.0003
0.0003
0.0004
0.0003
0.0004
0.0002
0.00035
0.00014
0.00095
0.00625
0.00045
0.0008
0.0003
0.0004
0.0002
0.0002
0.0002
0.00015
0.001
0.00055
0.0002
GW
0.0003
0.00047
0.0005
0.00039
0.00012
0.0002
0.00029
0.0005
0.0002
0.0016
0.00065
0.00037
0.00047
0.00022
0.0002
0.0003
0.00026
0.0005
0.0001
0.00004
0.00006
0.00028
0.0003
0.0003
0.0003
0.00042
0.0003
0.00039
0.0002
0.00036
0.00014
0.00095
0.00625
0.0003
0.0005
0.0007
0.0005
0.0002
0.0002
0.0002
0.00015
0.001
0.0005
0.0002
SW
0.0002
0.00059
0.0002
0.0001
0.00021
0.0003
0.0001
0.0004
0.00263
0.0003
0.00017
0.00055
0.0003
0.0005
0.00055
0.0001
0.00004
0.00005
0.00019
0.0002
0.0003
0.00025
0.00125
0.00042
0.00028
0.0003
0.00049
0.0011
0.0003
0.0003
0.0002
0.0002
0.0003
0.00045
0.00057
0.003
0.0002
90th Percentile Detect
Concentration (mg/L)
Total
0.00051
0.00147
0.0005
0.0011
0.0012
0.00097
0.002
0.002
0.0007
0.005
0.0007
0.00081
0.0022
0.00096
0.0013
0.0007
0.001
0.0019
0.00013
0.00013
0.00027
0.00087
0.0028
0.0007
0.0026
0.00157
0.0014
0.00091
0.002
0.001
0.00022
0.0013
0.01
0.002
0.0013
0.0012
0.00125
0.0004
0.00075
0.002
0.00042
0.002
0.00225
0.001
GW
0.00051
0.0011
0.0005
0.0011
0.0012
0.00097
0.002
0.002
0.0007
0.0016
0.0007
0.00081
0.0022
0.00096
0.0015
0.0085
0.001
0.002
0.00013
0.00014
0.00027
0.00087
0.0028
0.0007
0.0026
0.0016
0.0014
0.001
0.002
0.00105
0.00022
0.0013
0.01
0.0018
0.0013
0.0012
0.0013
0.0004
0.001
0.002
0.00041
0.001
0.0015
0.001
SW
0.00027
0.0015
0.001
0.0012
0.00051
0.002
0.0001
0.0007
0.005
0.0009
0.0003
0.0009
0.0007
0.0005
0.0016
0.0001
0.0001
0.00012
0.00032
0.0002
0.0006
0.0005
0.002
0.00081
0.0021
0.00065
0.0039
0.0011
0.0011
0.00053
0.0004
0.0005
0.0003
0.0028
0.0027
0.003
0.001
Maximum Detect
Concentration (mg/L)
Total
0.0071
0.002
0.0005
0.0031
0.01
0.002
0.002
0.01
0.002
0.005
0.0007
0.001
0.06
0.002
0.002
0.0086
0.01
0.006
0.0003
0.00506
0.00037
0.00114
0.0028
0.03
0.0078
0.03
0.0026
0.0028
0.004
0.02
0.00022
0.0013
0.01
0.02
0.0013
0.0016
0.0019
0.001
0.0026
0.02
0.0077
0.1
0.003
0.1
GW
0.0071
0.002
0.0005
0.0031
0.01
0.0018
0.002
0.01
0.002
0.0016
0.0007
0.001
0.06
0.002
0.002
0.0086
0.01
0.006
0.0003
0.00506
0.00037
0.00114
0.0028
0.03
0.0078
0.03
0.0026
0.0028
0.004
0.02
0.00022
0.0013
0.01
0.0045
0.0013
0.0012
0.0019
0.001
0.0026
0.02
0.0077
0.002
0.0015
0.06
SW
0.00027
0.0019
0.0011
0.009
0.002
0.002
0.0001
0.0007
0.005
0.0009
0.0003
0.001
0.003
0.002
0.0032
0.0001
0.0001
0.00012
0.00032
0.0002
0.0007
0.001
0.002
0.00081
0.0021
0.00065
0.02
0.0011
0.0016
0.00053
0.0006
0.0005
0.0003
0.0028
0.1
0.003
0.1
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A44b. Mercury (Inorganic) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
490
352
453
1,049
3,772
838
1,170
281
1,335
1,734
107
967
896
1,489
1,622
242
676
1,038
806
2,850
1,438
1,421
845
2,285
217
731
1,216
1,372
720
324
1,571
1,915
202
733
143
822
235
350
4,888
507
1,582
598
1,823
450
304
48,859
GW
389
279
381
1,001
3,252
617
1,131
278
1,309
1,618
95
934
848
1,386
1,573
93
558
970
752
2,801
1,411
1,344
786
2,146
190
720
1,175
1,335
681
304
1,332
1,790
175
611
134
757
224
161
4,547
457
1,414
556
1,803
290
255
44,863
SW
101
73
72
48
520
221
39
3
26
116
12
33
48
103
49
149
118
68
54
49
27
77
59
139
27
11
41
37
39
20
239
125
27
122
9
65
11
189
341
50
168
42
20
160
49
3,996
Total Population Served by Systems
Reporting
Total
546,448
4,701,100
2,452,800
6,161,306
36,340,528
4,998,506
2,716,176
679,823
17,251,183
7,466,977
1,303,767
2,500,395
1,050,473
9,168,041
4,980,031
4,602,489
8,525,575
5,022,488
727,707
6,539,864
3,894,967
3,006,743
757,505
6,973,678
563,069
1,449,290
942,517
7,762,526
1,667,049
970,526
11,195,033
10,216,143
749,266
2,777,164
913,584
3,462,560
328,972
5,683,572
25,060,220
2,543,652
4,803,450
490,389
4,044,416
1,415,227
446,184
229,853,379
GW
210,227
1,463,066
909,774
2,790,715
13,511,104
533,275
382,254
398,423
15,005,141
1,574,196
1,249,139
1,391,769
806,038
2,967,969
2,619,576
375,460
1,718,151
1,024,381
292,103
1,815,364
2,661,430
1,692,282
365,106
1,708,512
257,844
672,810
392,718
2,726,580
1,400,501
280,727
1,218,149
3,121,206
276,712
487,418
173,606
804,033
237,011
1,460,816
9,275,719
1,686,017
634,384
226,621
2,352,672
234,687
129,168
85,514,854
SW
336,221
3,238,034
1,543,026
3,370,591
22,829,424
4,465,231
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
244,435
6,200,072
2,360,455
4,227,029
6,807,424
3,998,107
435,604
4,724,500
1,233,537
1,314,461
392,399
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,799
9,976,884
7,094,937
472,554
2,289,746
739,978
2,658,527
91,961
4,222,756
15,784,501
857,635
4,169,066
263,768
1,691,744
1,180,540
317,016
144,338,525
Percent of Systems
with At Least One Detection
Total
3.061%
7.955%
0.221%
5.338%
6.098%
4.415%
2.393%
2.135%
4.270%
0.173%
0.935%
1.034%
2.567%
1.075%
2.528%
18.182%
5.030%
2.505%
4.839%
8.316%
1.878%
2.111%
0.828%
4.245%
0.000%
0.000%
0.658%
12.026%
5.000%
7.407%
2.101%
2.663%
0.990%
0.819%
1.399%
5.231%
2.128%
4.286%
1.002%
18.343%
0.822%
2.508%
13.165%
7.778%
2.961%
3.964%
GW
3.085%
5.735%
0.262%
4.795%
5.566%
2.593%
2.210%
1.799%
4.202%
0.062%
1.053%
1.071%
2.594%
0.938%
1.971%
10.753%
5.197%
1.649%
5.053%
8.283%
1.772%
2.083%
0.763%
3.868%
0.000%
0.000%
0.681%
11.685%
4.993%
5.921%
1.802%
2.682%
1.143%
0.982%
1.493%
3.435%
1.786%
1.242%
0.968%
16.849%
0.778%
2.518%
13.145%
7.241%
3.137%
3.669%
SW
2.970%
16.438%
0.000%
16.667%
9.423%
9.502%
7.692%
33.333%
7.692%
1.724%
0.000%
0.000%
2.083%
2.913%
20.408%
22.819%
4.237%
14.706%
1.852%
10.204%
7.407%
2.597%
1.695%
10.072%
0.000%
0.000%
0.000%
24.324%
5.128%
30.000%
3.766%
2.400%
0.000%
0.000%
0.000%
26.154%
9.091%
6.878%
1.466%
32.000%
1.190%
2.381%
15.000%
8.750%
2.041%
7.282%
Percent of Population Served
with At Least One Detection
Total
43.258%
28.081%
0.020%
51.813%
33.929%
17.246%
3.019%
20.553%
26.294%
1.371%
0.031%
1.443%
26.491%
4.084%
29.845%
43.234%
43.332%
40.382%
5.906%
59.692%
3.698%
1.817%
0.445%
13.455%
0.000%
0.000%
2.179%
21.470%
8.281%
46.780%
0.855%
0.952%
0.219%
0.124%
3.139%
36.478%
22.993%
12.423%
5.944%
59.137%
0.202%
1.151%
16.875%
4.848%
0.858%
20.052%
GW
1.748%
10.073%
0.054%
10.985%
32.197%
1.553%
1.056%
8.648%
28.131%
0.011%
0.032%
2.593%
11.449%
6.653%
4.558%
7.753%
3.528%
25.692%
13.898%
22.622%
4.478%
1.400%
0.900%
6.417%
0.000%
0.000%
5.230%
34.076%
9.233%
17.939%
0.974%
1.473%
0.594%
0.706%
16.521%
3.526%
4.919%
0.040%
14.742%
49.220%
0.889%
1.210%
24.966%
4.737%
1.366%
17.131%
SW
69.213%
36.218%
0.000%
85.617%
34.954%
19.121%
3.341%
37.409%
14.021%
1.735%
0.000%
0.000%
76.094%
2.854%
57.907%
46.386%
53.379%
44.146%
0.546%
73.936%
2.015%
2.354%
0.022%
15.739%
0.000%
0.000%
0.000%
14.645%
3.282%
58.517%
0.841%
0.723%
0.000%
0.000%
0.000%
46.444%
69.576%
16.707%
0.773%
78.633%
0.097%
1.099%
5.623%
4.870%
0.651%
21.783%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A44c. Mercury (Inorganic) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.002 mg/L
Total
1
0
0
2
16
0
0
1
0
1
0
0
3
0
0
3
2
2
0
2
0
0
1
2
0
0
2
16
1
1
2
2
0
0
2
6
0
0
0
0
1
1
8
3
1
82
GW
1
0
0
2
10
0
0
1
0
0
0
0
3
0
0
2
2
1
0
2
0
0
1
2
0
0
2
16
1
1
1
2
0
0
2
3
0
0
0
0
1
1
7
0
0
64
SW
0
0
0
0
6
0
0
0
0
1
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
3
0
0
0
0
0
0
1
3
1
18
Percent of Systems
with At Least One Detection
> 0.002 mg/L
Total
0.204%
0.000%
0.000%
0.191%
0.424%
0.000%
0.000%
0.356%
0.000%
0.058%
0.000%
0.000%
0.335%
0.000%
0.000%
1.240%
0.296%
0.193%
0.000%
0.070%
0.000%
0.000%
0.118%
0.088%
0.000%
0.000%
0.164%
1.166%
0.139%
0.309%
0.127%
0.104%
0.000%
0.000%
1.399%
0.730%
0.000%
0.000%
0.000%
0.000%
0.063%
0.167%
0.439%
0.667%
0.329%
0.168%
GW
0.257%
0.000%
0.000%
0.200%
0.308%
0.000%
0.000%
0.360%
0.000%
0.000%
0.000%
0.000%
0.354%
0.000%
0.000%
2.151%
0.358%
0.103%
0.000%
0.071%
0.000%
0.000%
0.127%
0.093%
0.000%
0.000%
0.170%
1.199%
0.147%
0.329%
0.075%
0.112%
0.000%
0.000%
1.493%
0.396%
0.000%
0.000%
0.000%
0.000%
0.071%
0.180%
0.388%
0.000%
0.000%
0.143%
SW
0.000%
0.000%
0.000%
0.000%
1.154%
0.000%
0.000%
0.000%
0.000%
0.862%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
0.000%
1.471%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.418%
0.000%
0.000%
0.000%
0.000%
4.615%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.000%
1.875%
2.041%
0.450%
Population Served by Systems
with At Least One Detection
> 0.002 mg/L
Total
200
0
0
277
1,873,292
0
0
6,150
0
2,671
0
0
2,163
0
0
99,748
745
4,058
0
109
0
0
150
65
0
0
113
27,879
23,540
30
18,643
960
0
0
28,681
426,360
0
0
0
0
98
40
35,580
37,703
2,065
2,591,320
GW
200
0
0
277
502,592
0
0
6,150
0
0
0
0
2,163
0
0
4,877
745
58
0
109
0
0
150
65
0
0
113
27,879
23,540
30
3,000
960
0
0
28,681
1,699
0
0
0
0
98
40
14,240
0
0
617,666
SW
0
0
0
0
1,370,700
0
0
0
0
2,671
0
0
0
0
0
94,871
0
4,000
0
0
0
0
0
0
0
0
0
0
0
0
15,643
0
0
0
0
424,661
0
0
0
0
0
0
21,340
37,703
2,065
1,973,654
Percent of Population Served
with At Least One Detection
> 0.002 mg/L
Total
0.037%
0.000%
0.000%
0.004%
5.155%
0.000%
0.000%
0.905%
0.000%
0.036%
0.000%
0.000%
0.206%
0.000%
0.000%
2.167%
0.009%
0.081%
0.000%
0.002%
0.000%
0.000%
0.020%
0.001%
0.000%
0.000%
0.012%
0.359%
1.412%
0.003%
0.167%
0.009%
0.000%
0.000%
3.139%
12.313%
0.000%
0.000%
0.000%
0.000%
0.002%
0.008%
0.880%
2.664%
0.463%
1.127%
GW
0.095%
0.000%
0.000%
0.010%
3.720%
0.000%
0.000%
1.544%
0.000%
0.000%
0.000%
0.000%
0.268%
0.000%
0.000%
1.299%
0.043%
0.006%
0.000%
0.006%
0.000%
0.000%
0.041%
0.004%
0.000%
0.000%
0.029%
1.022%
1.681%
0.011%
0.246%
0.031%
0.000%
0.000%
16.521%
0.211%
0.000%
0.000%
0.000%
0.000%
0.015%
0.018%
0.605%
0.000%
0.000%
0.722%
SW
0.000%
0.000%
0.000%
0.000%
6.004%
0.000%
0.000%
0.000%
0.000%
0.045%
0.000%
0.000%
0.000%
0.000%
0.000%
2.244%
0.000%
0.100%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.157%
0.000%
0.000%
0.000%
0.000%
15.974%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.261%
3.194%
0.651%
1.367%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A44d. Mercury (Inorganic) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.001 mg/L
Total
1
6
0
13
55
4
7
1
8
2
0
1
3
1
8
3
6
5
0
2
0
1
1
5
0
0
4
41
7
3
5
6
0
3
2
10
2
3
10
1
2
2
14
23
3
274
GW
1
2
0
11
39
2
6
1
8
1
0
1
3
1
7
2
5
2
0
2
0
1
1
5
0
0
4
40
6
3
4
6
0
3
2
5
1
1
10
1
2
2
13
17
2
223
SW
0
4
0
2
16
2
1
0
0
1
0
0
0
0
1
1
1
3
0
0
0
0
0
0
0
0
0
1
1
0
1
0
0
0
0
5
1
2
0
0
0
0
1
6
1
51
Percent of Systems
with At Least One Detection
> 0.001 mg/L
Total
0.204%
1.705%
0.000%
1.239%
1.458%
0.477%
0.598%
0.356%
0.599%
0.115%
0.000%
0.103%
0.335%
0.067%
0.493%
1.240%
0.888%
0.482%
0.000%
0.070%
0.000%
0.070%
0.118%
0.219%
0.000%
0.000%
0.329%
2.988%
0.972%
0.926%
0.318%
0.313%
0.000%
0.409%
1.399%
1.217%
0.851%
0.857%
0.205%
0.197%
0.126%
0.334%
0.768%
5.111%
0.987%
0.561%
GW
0.257%
0.717%
0.000%
1.099%
1.199%
0.324%
0.531%
0.360%
0.611%
0.062%
0.000%
0.107%
0.354%
0.072%
0.445%
2.151%
0.896%
0.206%
0.000%
0.071%
0.000%
0.074%
0.127%
0.233%
0.000%
0.000%
0.340%
2.996%
0.881%
0.987%
0.300%
0.335%
0.000%
0.491%
1.493%
0.661%
0.446%
0.621%
0.220%
0.219%
0.141%
0.360%
0.721%
5.862%
0.784%
0.497%
SW
0.000%
5.479%
0.000%
4.167%
3.077%
0.905%
2.564%
0.000%
0.000%
0.862%
0.000%
0.000%
0.000%
0.000%
2.041%
0.671%
0.847%
4.412%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.703%
2.564%
0.000%
0.418%
0.000%
0.000%
0.000%
0.000%
7.692%
9.091%
1.058%
0.000%
0.000%
0.000%
0.000%
5.000%
3.750%
2.041%
1.276%
Population Served by Systems
with At Least One Detection
> 0.001 mg/L
Total
200
958,009
0
715,990
7,342,316
147,212
37,823
6,150
515,436
2,846
0
510
2,163
684
49,172
99,748
11,042
1,725,538
0
109
0
235
150
2,206
0
0
19,166
274,161
36,726
3,163
19,087
7,974
0
3,306
28,681
428,676
64,027
9,677
13,335
15,800
423
190
242,886
47,732
2,576
12,835,125
GW
200
3,342
0
90,765
1,126,527
445
1,756
6,150
515,436
175
0
510
2,163
684
43,184
4,877
8,156
238
0
109
0
235
150
2,206
0
0
19,166
124,161
28,102
3,163
3,444
7,974
0
3,306
28,681
2,025
44
33
13,335
15,800
423
190
221,546
3,043
511
2,282,255
SW
0
954,667
0
625,225
6,215,789
146,767
36,067
0
0
2,671
0
0
0
0
5,988
94,871
2,886
1,725,300
0
0
0
0
0
0
0
0
0
150,000
8,624
0
15,643
0
0
0
0
426,651
63,983
9,644
0
0
0
0
21,340
44,689
2,065
10,552,870
Percent of Population Served
with At Least One Detection
> 0.001 mg/L
Total
0.037%
20.378%
0.000%
11.621%
20.204%
2.945%
1.393%
0.905%
2.988%
0.038%
0.000%
0.020%
0.206%
0.007%
0.987%
2.167%
0.130%
34.356%
0.000%
0.002%
0.000%
0.008%
0.020%
0.032%
0.000%
0.000%
2.033%
3.532%
2.203%
0.326%
0.170%
0.078%
0.000%
0.119%
3.139%
12.380%
19.463%
0.170%
0.053%
0.621%
0.009%
0.039%
6.005%
3.373%
0.577%
5.584%
GW
0.095%
0.228%
0.000%
3.252%
8.338%
0.083%
0.459%
1.544%
3.435%
0.011%
0.000%
0.037%
0.268%
0.023%
1.649%
1.299%
0.475%
0.023%
0.000%
0.006%
0.000%
0.014%
0.041%
0.129%
0.000%
0.000%
4.880%
4.554%
2.007%
1.127%
0.283%
0.255%
0.000%
0.678%
16.521%
0.252%
0.019%
0.002%
0.144%
0.937%
0.067%
0.084%
9.417%
1.297%
0.396%
2.669%
SW
0.000%
29.483%
0.000%
18.549%
27.227%
3.287%
1.545%
0.000%
0.000%
0.045%
0.000%
0.000%
0.000%
0.000%
0.254%
2.244%
0.042%
43.153%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.979%
3.235%
0.000%
0.157%
0.000%
0.000%
0.000%
0.000%
16.048%
69.576%
0.228%
0.000%
0.000%
0.000%
0.000%
1.261%
3.785%
0.651%
7.311%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A45. Methoxychlor —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 40 u.g/L
> 20 ug/L
> 40 u.g/L
> 20 ug/L
> 40 u.g/L
> 20 ug/L
Total # Systems
Reporting
30,291
30,291
3,130
3,130
33,421
33,421
# Systems Exceeding
Threshold of Interest
0
0
0
0
0
0
% Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Total Pop. Served by
Systems Reporting
68,501,754
68,501,754
119,134,365
119,134,365
187,636,119
187,636,119
Total Pop. Served by
Systems Exceeding
Threshold of Interest
0
0
0
0
0
0
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A45a. Methoxychlor —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
104
519
1,664
6,919
14,512
3,382
1,601
758
2,396
1,481
2,101
146
1,978
4,682
2,251
1,758
3,023
2,744
456
6,875
4,761
5,560
3,005
13,610
403
4,480
4,193
39
4,354
1,639
2,945
674
2,056
922
2,966
954
65
11,038
7,113
504
1,315
3,185
646
1,291
137,068
GW
53
387
1,423
5,460
8,466
2,401
1,015
729
2,329
1,402
2,004
127
1,710
3,947
2,086
443
2,236
1,726
391
6,423
4,620
4,692
2,697
12,474
338
4,131
3,874
33
4,104
1,199
2,204
437
1,572
630
2,572
845
12
5,279
5,925
178
1,112
3,092
336
964
108,078
SW
51
132
241
1,459
6,046
981
586
29
67
79
97
19
268
735
165
1,315
787
1,018
65
452
141
868
308
1,136
65
349
319
6
250
440
741
237
484
292
394
109
53
5,759
1,188
326
203
93
310
327
28,990
Percent of Samples
with Detections
Total
0.000%
0.193%
0.240%
0.000%
0.007%
0.000%
0.437%
0.000%
0.459%
0.000%
0.000%
1.370%
0.000%
0.000%
0.000%
0.398%
0.165%
0.474%
0.000%
0.000%
0.000%
0.018%
0.000%
0.007%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.108%
0.000%
0.000%
0.000%
0.009%
0.000%
0.000%
0.076%
0.000%
2.167%
0.077%
0.052%
GW
0.000%
0.000%
0.281%
0.000%
0.012%
0.000%
0.000%
0.000%
0.472%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.089%
0.232%
0.000%
0.000%
0.000%
0.021%
0.000%
0.008%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.090%
0.000%
2.381%
0.104%
0.031%
SW
0.000%
0.758%
0.000%
0.000%
0.000%
0.000%
1.195%
0.000%
0.000%
0.000%
0.000%
10.526%
0.000%
0.000%
0.000%
0.532%
0.381%
0.884%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.342%
0.000%
0.000%
0.000%
0.017%
0.000%
0.000%
0.000%
0.000%
1.935%
0.000%
0.128%
Minimum Detect
Concentration (u.g/L)
Total
0.1
0.07
0.06
0.1
0.009
0.2
0.0073
0.1
0.16
0.12
0.32
0.14
0.28
0.05
0.03
0.62
0.0073
GW
0.07
0.06
0.009
0.1
0.6
0.12
0.32
0.05
0.03
0.62
0.009
SW
0.1
0.1
0.2
0.0073
0.1
0.16
0.14
0.28
0.03
0.0073
Median Detect
Concentration (u.g/L)
Total
0.1
0.12
0.06
0.22
0.02
0.2
0.31
0.1
0.6
0.12
0.32
0.14
0.28
0.05
0.04
0.62
0.1
GW
0.12
0.06
0.02
0.2
0.8
0.12
0.32
0.05
0.035
0.62
0.04
SW
0.1
0.22
0.2
0.31
0.1
0.48
0.14
0.28
0.1
0.2
90th Percentile Detect
Concentration (u.g/L)
Total
0.1
0.17
0.06
0.22
0.02
0.2
0.5
0.3
0.8
0.12
0.32
0.14
0.28
0.05
0.5
0.62
0.6
GW
0.17
0.06
0.02
0.3
0.8
0.12
0.32
0.05
0.07
0.62
0.62
SW
0.1
0.22
0.2
0.5
0.1
1.1
0.14
0.28
0.5
0.6
Maximum Detect
Concentration (u.g/L)
Total
0.1
0.17
0.06
0.22
0.02
0.2
0.5
0.3
1.1
0.12
0.32
0.14
0.28
0.05
0.5
0.62
1.1
GW
0.17
0.06
0.02
0.3
0.8
0.12
0.32
0.05
0.07
0.62
0.8
SW
0.1
0.22
0.2
0.5
0.1
1.1
0.14
0.28
0.5
1.1
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A45b. Methoxych lor —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
16
175
450
949
1,688
810
657
201
1,315
297
112
98
784
1,371
1,402
243
645
862
269
2,935
1,287
1,471
813
2,365
207
762
1,237
35
695
291
1,348
285
1,085
105
773
261
12
2,002
427
182
442
1,410
343
304
33,421
GW
10
130
379
901
1,393
591
619
198
1,294
283
100
94
733
1,267
1,358
93
528
794
241
2,874
1,258
1,395
753
2,228
180
751
1,196
30
659
270
1,117
205
935
97
714
240
6
1,665
390
71
409
1,390
196
256
30,291
SW
6
45
71
48
295
219
38
3
21
14
12
4
51
104
44
150
117
68
28
61
29
76
60
137
27
11
41
5
36
21
231
80
150
8
59
21
6
337
37
111
33
20
147
48
3,130
Total Population Served by Systems
Reporting
Total
246,416
2,737,924
2,447,627
6,081,248
33,918,407
4,991,644
2,595,377
628,982
16,791,489
997,274
1,305,882
305,037
1,036,541
9,186,700
4,866,349
4,612,320
8,485,498
4,906,096
510,420
7,227,231
3,934,332
2,644,644
753,259
6,885,177
559,051
1,455,834
945,754
1,380,103
1,662,962
960,972
4,924,821
6,558,119
2,937,414
902,560
3,427,802
622,272
655,614
21,523,196
2,500,736
2,391,215
432,910
3,883,918
1,368,815
446,177
187,636,119
GW
14,306
625,336
905,863
2,710,657
12,195,317
524,735
261,490
347,582
14,552,313
305,252
1,251,254
99,579
793,942
2,986,303
2,546,613
375,460
1,683,116
907,989
134,500
2,047,375
2,684,691
1,700,183
360,590
1,733,551
253,826
679,354
395,955
143,223
1,400,064
271,081
981,544
518,824
572,664
163,122
801,019
263,101
145,112
5,759,696
1,667,550
30,317
181,746
2,192,174
204,156
129,229
68,501,754
SW
232,110
2,112,588
1,541,764
3,370,591
21,723,090
4,466,909
2,333,887
281,400
2,239,176
692,022
54,628
205,458
242,599
6,200,397
2,319,736
4,236,860
6,802,382
3,998,107
375,920
5,179,856
1,249,641
944,461
392,669
5,151,626
305,225
776,480
549,799
1,236,880
262,898
689,891
3,943,277
6,039,295
2,364,750
739,438
2,626,783
359,171
510,502
15,763,500
833,186
2,360,898
251,164
1,691,744
1,164,659
316,948
119,134,365
Percent of Systems
with At Least One Detection
Total
0.000%
0.571%
0.667%
0.000%
0.059%
0.000%
0.609%
0.000%
0.380%
0.000%
0.000%
2.041%
0.000%
0.000%
0.000%
2.058%
0.620%
1.160%
0.000%
0.000%
0.000%
0.068%
0.000%
0.042%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.952%
0.000%
0.000%
0.000%
0.050%
0.000%
0.000%
0.226%
0.000%
3.499%
0.329%
0.159%
GW
0.000%
0.000%
0.792%
0.000%
0.072%
0.000%
0.000%
0.000%
0.386%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.379%
0.504%
0.000%
0.000%
0.000%
0.072%
0.000%
0.045%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.244%
0.000%
4.082%
0.391%
0.089%
SW
0.000%
2.222%
0.000%
0.000%
0.000%
0.000%
10.526%
0.000%
0.000%
0.000%
0.000%
50.000%
0.000%
0.000%
0.000%
3.333%
1.709%
8.824%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
12.500%
0.000%
0.000%
0.000%
0.297%
0.000%
0.000%
0.000%
0.000%
2.721%
0.000%
0.831%
Percent of Population Served
with At Least One Detection
Total
0.000%
0.813%
0.157%
0.000%
0.147%
0.000%
17.133%
0.000%
15.509%
0.000%
0.000%
21.661%
0.000%
0.000%
0.000%
7.147%
0.916%
37.858%
0.000%
0.000%
0.000%
0.039%
0.000%
0.003%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
7.563%
0.000%
0.000%
0.000%
0.036%
0.000%
0.000%
0.071%
0.000%
0.946%
0.101%
2.956%
GW
0.000%
0.000%
0.424%
0.000%
0.410%
0.000%
0.000%
0.000%
17.895%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.076%
0.031%
0.000%
0.000%
0.000%
0.060%
0.000%
0.012%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.169%
0.000%
0.812%
0.348%
3.912%
SW
0.000%
1.053%
0.000%
0.000%
0.000%
0.000%
19.052%
0.000%
0.000%
0.000%
0.000%
32.159%
0.000%
0.000%
0.000%
7.781%
0.876%
46.449%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
9.232%
0.000%
0.000%
0.000%
0.049%
0.000%
0.000%
0.000%
0.000%
0.970%
0.000%
2.406%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A45c. Methoxychlor —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 40 u.g/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 40 u.g/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 40 u.g/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 40 u.g/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A45d. Methoxych lor —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 20 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 20 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 20 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 20 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A46. Monochlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 100 ug/L
> 50 ug/L
> 100 ug/L
> 50 ug/L
> 100 ug/L
> 50 ug/L
Total # Systems
Reporting
46,069
46,069
4,242
4,242
50,311
50,311
# Systems Exceeding
Threshold of Interest
0
0
0
0
0
0
% Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Total Pop. Served by
Systems Reporting
85,149,817
85,149,817
140,477,965
140,477,965
225,627,782
225,627,782
Total Pop. Served by
Systems Exceeding
Threshold of Interest
0
0
0
0
0
0
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A46a. Monochlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,184
820
2,394
11,717
85,614
2,863
6,654
1,048
4,155
7,175
1,757
3,750
6,995
4,621
3,310
16,249
6,768
3,698
10,754
8,581
7,543
4,490
19,064
552
6,840
9,585
20,354
6,575
3,202
7,076
8,852
5,355
2,324
1,959
4,342
889
2,935
34,144
8,986
4,909
4,342
11,296
1,139
1,659
370,519
GW
2,046
596
1,926
9,527
45,340
2,124
5,765
1,018
4,087
6,348
1,632
3,289
6,428
4,311
1,126
12,259
5,508
3,383
9,744
7,332
6,694
3,952
17,485
417
6,264
9,107
18,568
6,099
2,574
5,420
7,690
3,958
1,682
1,591
3,805
855
1,166
27,040
7,560
4,038
3,951
11,172
444
1,156
286,477
SW
1,138
224
468
2,190
40,274
739
889
30
68
827
125
461
567
310
2,184
3,990
1,260
315
1,010
1,249
849
538
1,579
135
576
478
1,786
476
628
1,656
1,162
1,397
642
368
537
34
1,769
7,104
1,426
871
391
124
695
503
84,042
Percent of Samples
with Detections
Total
0.031%
0.122%
0.376%
0.026%
0.152%
0.175%
0.060%
0.000%
0.963%
0.000%
0.000%
0.000%
0.014%
0.022%
0.332%
0.055%
0.044%
0.027%
0.009%
0.047%
0.013%
0.022%
0.142%
0.000%
0.058%
0.083%
0.275%
0.015%
0.250%
0.099%
0.023%
0.037%
0.000%
0.000%
0.000%
0.000%
0.000%
0.009%
0.022%
0.081%
0.023%
0.089%
1.229%
0.000%
0.101%
GW
0.049%
0.168%
0.467%
0.000%
0.282%
0.141%
0.069%
0.000%
0.979%
0.000%
0.000%
0.000%
0.016%
0.000%
0.000%
0.057%
0.054%
0.030%
0.000%
0.055%
0.015%
0.025%
0.132%
0.000%
0.048%
0.088%
0.178%
0.016%
0.311%
0.092%
0.013%
0.051%
0.000%
0.000%
0.000%
0.000%
0.000%
0.011%
0.026%
0.099%
0.025%
0.090%
2.477%
0.000%
0.111%
SW
0.000%
0.000%
0.000%
0.137%
0.005%
0.271%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.323%
0.504%
0.050%
0.000%
0.000%
0.099%
0.000%
0.000%
0.000%
0.253%
0.000%
0.174%
0.000%
1.288%
0.000%
0.000%
0.121%
0.086%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.432%
0.000%
0.067%
Minimum Detect
Concentration (u.g/L)
Total
0.5
1.6
0.07
0.5
0.5
0.05
0.5
0.08
1.2
9.7
0.003
0.66
0.5
0.5
16
0.9
4.4
0.5
0.5
0.21
0.5
0.05
0.2
0.5
0.5
0.5
0.4
0.7
19
0.5
0.99
0.02
0.07
0.003
GW
0.5
1.6
0.07
0.5
0.06
0.5
0.08
1.2
0.66
0.5
0.5
0.9
4.4
0.5
0.5
0.21
0.5
0.05
0.2
0.5
0.5
1.06
0.4
0.7
19
0.5
0.99
0.02
0.07
0.02
SW
0.5
0.52
0.05
9.7
0.003
0.8
16
0.7
0.95
0.1
0.5
0.5
0.5
0.003
Median Detect
Concentration (u.g/L)
Total
0.5
1.6
0.12
0.5
0.8
0.06
0.6
0.78
1.2
9.7
0.5
15
2.6
0.5
16
1.3
4.4
0.5
0.8
0.595
0.515
0.8
0.2
0.935
0.5
0.78
0.45
0.91
19
0.6
0.99
0.255
0.5
0.7
GW
0.5
1.6
0.12
0.8
0.06
0.6
0.78
1.2
17
2.6
0.5
1.3
4.4
0.5
0.7
0.24
0.515
0.56
0.2
0.935
0.5
1.06
0.45
0.91
19
0.6
0.99
0.255
0.5
0.7
SW
0.5
0.59
0.055
9.7
0.5
0.9
16
1.775
0.95
1
0.5
0.5
0.5
0.8
90th Percentile Detect
Concentration (u.g/L)
Total
0.5
1.6
0.3
0.5
2
0.08
2.5
1.745
1.2
9.7
1.2
42
5.7
0.5
16
1.7
4.4
0.5
2
2.73
0.65
1.6
0.2
1.69
8.8
1.06
0.5
35
19
1.5
0.99
0.58
0.5
1.94
GW
0.5
1.6
0.3
2
0.08
2.5
1.745
1.2
42
5.7
0.5
1.7
4.4
0.5
1.6
2.73
0.65
1.05
0.2
1.69
8.8
1.06
0.5
35
19
1.5
0.99
0.58
0.5
2
SW
0.5
0.66
0.06
9.7
1.2
1
16
19.7
0.95
1.7
0.5
0.5
1
1.9
Maximum Detect
Concentration (u.g/L)
Total
0.5
1.6
0.3
0.5
13
0.08
2.5
3.7
1.2
9.7
1.2
42
5.7
0.5
16
1.7
4.4
0.5
19.7
2.73
0.65
4.14
0.2
1.69
8.8
1.06
0.5
35
19
1.5
0.99
0.61
1
42
GW
0.5
1.6
0.3
13
0.08
2.5
3.7
1.2
42
5.7
0.5
1.7
4.4
0.5
2
2.73
0.65
4.14
0.2
1.69
8.8
1.06
0.5
35
19
1.5
0.99
0.61
0.5
42
SW
0.5
0.66
0.06
9.7
1.2
1
16
19.7
0.95
2
0.5
0.5
1
19.7
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A46b. Monochlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
263
454
1,059
3,657
826
1,200
318
1,510
1,822
1,056
935
1,429
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
210
771
1,258
1,398
726
338
1,517
1,944
718
1,097
145
819
245
351
4,951
500
1,597
603
1,784
403
304
50,311
GW
474
202
382
1,011
3,141
605
1,161
315
1,484
1,706
1,023
878
1,325
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
183
760
1,217
1,361
687
317
1,283
1,819
506
945
136
757
233
162
4,609
454
1,426
560
1,764
243
256
46,069
SW
146
61
72
48
516
221
39
3
26
116
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
234
125
212
152
9
62
12
189
342
46
171
43
20
160
48
4,242
Total Population Served by Systems
Reporting
Total
606,193
4,218,278
2,453,348
6,166,873
35,829,496
4,997,841
2,722,518
698,987
17,495,564
7,485,298
2,543,141
1,093,666
9,217,431
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,748,495
1,698,755
973,592
4,884,210
10,227,597
3,119,686
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,271,968
491,035
4,039,526
1,416,020
446,177
225,627,782
GW
232,590
1,123,190
910,322
2,796,282
13,517,105
530,207
388,596
417,587
15,249,522
1,592,517
1,434,515
837,604
3,017,034
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,712,549
1,432,207
283,701
1,042,143
3,132,660
660,832
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
629,385
227,067
2,347,782
237,670
129,229
85,149,817
SW
373,603
3,095,088
1,543,026
3,370,591
22,312,391
4,467,634
2,333,922
281,400
2,246,042
5,892,781
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,842,067
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,642,583
263,968
1,691,744
1,178,350
316,948
140,477,965
Percent of Systems
with At Least One Detection
Total
0.161%
0.380%
1.762%
0.094%
0.219%
0.605%
0.167%
0.000%
0.861%
0.000%
0.000%
0.000%
0.070%
0.068%
2.905%
0.696%
0.285%
0.123%
0.034%
0.190%
0.071%
0.118%
0.465%
0.000%
0.519%
0.159%
1.144%
0.138%
0.592%
0.461%
0.103%
0.139%
0.000%
0.000%
0.000%
0.000%
0.000%
0.061%
0.200%
0.188%
0.166%
0.224%
3.474%
0.000%
0.268%
GW
0.211%
0.495%
2.094%
0.000%
0.191%
0.496%
0.172%
0.000%
0.876%
0.000%
0.000%
0.000%
0.075%
0.000%
0.000%
0.500%
0.304%
0.132%
0.000%
0.193%
0.075%
0.127%
0.314%
0.000%
0.395%
0.164%
0.955%
0.146%
0.631%
0.390%
0.055%
0.198%
0.000%
0.000%
0.000%
0.000%
0.000%
0.065%
0.220%
0.210%
0.179%
0.227%
4.527%
0.000%
0.228%
SW
0.000%
0.000%
0.000%
2.083%
0.388%
0.905%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.273%
4.698%
1.695%
0.000%
0.000%
1.639%
0.000%
0.000%
0.000%
2.878%
0.000%
9.091%
0.000%
8.108%
0.000%
0.000%
0.855%
0.800%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.875%
0.000%
0.707%
Percent of Population Served
with At Least One Detection
Total
0.825%
0.149%
0.598%
4.865%
1.538%
0.413%
0.029%
0.000%
3.641%
0.000%
0.000%
0.000%
0.017%
5.388%
9.116%
1.522%
0.589%
0.030%
0.135%
0.080%
0.017%
0.013%
0.562%
0.000%
35.170%
0.030%
6.206%
0.007%
0.037%
0.091%
0.443%
0.008%
0.000%
0.000%
0.000%
0.000%
0.000%
0.042%
0.001%
0.053%
0.018%
0.156%
2.193%
0.000%
1.564%
GW
2.150%
0.559%
1.612%
0.000%
0.639%
0.179%
0.200%
0.000%
4.177%
0.000%
0.000%
0.000%
0.053%
0.000%
0.000%
0.421%
2.884%
0.073%
0.000%
0.113%
0.030%
0.026%
0.048%
0.000%
0.304%
0.071%
7.449%
0.008%
0.127%
0.395%
0.004%
0.038%
0.000%
0.000%
0.000%
0.000%
0.000%
0.113%
0.002%
0.445%
0.040%
0.268%
1.018%
0.000%
1.205%
SW
0.000%
0.000%
0.000%
8.901%
2.082%
0.441%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
11.360%
9.925%
1.805%
0.000%
0.000%
0.187%
0.000%
0.000%
0.000%
0.731%
0.000%
65.960%
0.000%
5.537%
0.000%
0.000%
0.008%
0.637%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.430%
0.000%
1.782%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A46c. Monochlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 100 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 100 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 100 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 100 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A46d. Monochlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 50 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 50 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 50 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 50 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A47. Nitrate (as N) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 10 mg/L
>5 mg/L
> 10 mg/L
>5 mg/L
> 10 mg/L
>5 mg/L
Total # Systems
Reporting
114,764
114,764
4,773
4,773
119,537
119,537
# Systems Exceeding
Threshold of Interest
2,855
10,742
118
368
2,973
11,110
% Systems Exceeding
Threshold of Interest
2.488%
9.360%
2.472%
7.710%
2.487%
9.294%
Total Pop Served by
Systems Reporting
92,900,757
92,900,757
136,607,279
136,607,279
229,508,036
229,508,036
Total Pop. Served by
Systems Exceeding
Threshold of Interest
5,278,260
19,289,360
11,498,833
24,830,964
16,777,093
44,120,324
% Pop. Served by
Systems Exceeding
Threshold of Interest
5.682%
20.763%
8.417%
18.177%
7.310%
19.224%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A47a. Nitrate (as N) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
10,435
6,717
23,327
229,724
11,861
15,989
5,415
15,514
313
3,191
27,727
21,327
14,109
38,430
3,852
23,712
36,120
20,466
97,673
81,637
24,401
1,210
55,468
24
31
14,766
42,954
375
7,723
32,231
43,957
2,270
11,977
6,011
12,298
342
4,234
32,726
22,429
362
10,203
32,001
4,241
2,714
1,052,487
GW
8,920
5,735
20,063
137,054
9,486
15,201
5,337
15,275
310
3,100
26,586
19,652
13,061
37,583
1,361
19,109
33,598
19,721
96,866
80,734
23,508
1,131
53,861
11
31
14,629
41,610
359
6,603
29,172
32,489
2,047
10,686
5,653
11,682
317
2,159
28,612
19,124
314
9,649
31,850
3,387
2,309
899,945
SW
1,515
982
3,264
92,670
2,375
788
78
239
3
91
1,141
1,675
1,048
847
2,491
4,603
2,522
745
807
903
893
79
1,607
13
0
137
1,344
16
1,120
3,059
11,468
223
1,291
358
616
25
2,075
4,114
3,305
48
554
151
854
405
152,542
Percent of Samples
with Detections
Total
46.909%
51.764%
87.435%
85.504%
71.604%
71.649%
66.242%
55.969%
49.840%
80.100%
66.094%
74.844%
39.450%
59.649%
79.958%
83.713%
56.166%
44.684%
40.045%
31.752%
0.086%
86.612%
47.766%
70.833%
74.194%
30.218%
66.869%
52.800%
80.008%
61.444%
49.091%
84.009%
45.671%
82.948%
59.416%
83.333%
69.509%
79.301%
91.547%
69.890%
42.282%
59.189%
56.921%
70.818%
61.385%
GW
46.693%
46.748%
87.769%
84.806%
73.023%
71.252%
65.767%
55.417%
49.355%
81.871%
65.053%
76.435%
35.319%
58.997%
75.018%
81.558%
53.325%
45.485%
39.652%
31.554%
0.089%
86.561%
47.960%
36.364%
74.194%
30.234%
66.486%
52.368%
80.433%
59.807%
36.215%
83.732%
46.472%
82.947%
58.594%
86.120%
50.672%
77.502%
90.959%
67.516%
42.284%
59.250%
51.225%
73.798%
57.670%
SW
48.185%
81.059%
85.386%
86.537%
65.937%
79.315%
98.718%
91.213%
100.000%
19.780%
90.359%
56.179%
90.935%
88.548%
82.658%
92.657%
94.013%
23.490%
87.237%
49.391%
0.000%
87.342%
41.257%
100.000%
0.000%
28.467%
78.720%
62.500%
77.500%
77.051%
85.569%
86.547%
39.040%
82.961%
75.000%
48.000%
89.108%
91.808%
94.947%
85.417%
42.238%
46.358%
79.508%
53.827%
83.304%
Minimum Detect
Concentration (mg/L)
Total
1E-06
0.00016
0.0026
0.0018
0.00121
9.3E-06
0.0022
0.001
0.01
0.3
0.01
0.0013
0.0006
0.0005
0.0007
0.005
0.001
0.00274
0.0062
0.01
0.01
0.01
0.001
0.03
0.15
0.01
0.001
0.01
0.0007
0.00018
0.00005
0.02
0.00819
0.0015
0.003
0.08
0.01
0.01
0.01
0.02
0.00013
0.002
0.00014
0.01
1E-06
GW
1E-06
0.00016
0.0026
0.00226
0.00121
9.3E-06
0.0022
0.001
0.01
0.3
0.01
0.0013
0.00082
0.0005
0.001
0.008
0.001
0.00274
0.0062
0.01
0.01
0.01
0.001
0.04
0.15
0.01
0.001
0.01
0.0007
0.00018
0.00005
0.02
0.00819
0.0015
0.003
0.08
0.01
0.01
0.01
0.02
0.00013
0.002
0.00275
0.01
1E-06
SW
7.3E-05
0.0008
0.0034
0.0018
0.01
0.003
0.8
0.002
0.14
0.33
0.07
0.00652
0.0006
0.005
0.0007
0.005
0.002
0.01
0.1
0.05
0.01
0.01
0.03
0.12
0.009
0.03
0.05
0.00067
0.00149
0.05
0.01
0.01
0.02
0.1
0.05
0.01
0.02
0.09
0.004
0.06
0.00014
0.01
7.3E-05
Median Detect
Concentration (mg/L)
Total
0.57
0.53
1.85
4.52
0.7
1.62
5.1
0.5
0.23
1
3.67
1.46
1.6
0.5
0.675
0.84
3.9
1.04
0.5
0.96
0.01
0.47
1.3
0.09
2.7
0.69
2.1
0.455
1.01
0.97
0.86
1.48
1.3
1.115
0.52
1.09
0.66
0.19
0.6
1.1
0.7
2.51
0.44
0.7
1.8
GW
0.62
0.51
1.8
4.294
0.92
1.7
5.2
0.52
0.23
1
3.7
1.46
1.6
0.5
1.11
0.97
4.1
1.06
0.5
0.98
0.01
0.5
1.36
0.805
2.7
0.7
2.19
0.455
1
1
0.83
1.71
1.42
1.2
0.56
1.11
0.74
0.19
0.6
1.17
0.7
2.55
0.39
0.8
1.6
SW
0.32
0.58
2.1
4.52
0.26
0.85
3.1
0.31
0.28
0.79
3.4
1.54
1.75
1.15
0.59
0.67
2.7
0.5
0.4
0.35
0.12
0.29
0.07
0.5
1.2
0.495
1.02
0.6
0.88
0.65
0.6
0.6
0.32
0.15
0.63
0.21
0.5
0.62
0.3
0.5
0.48
0.315
2.712
90th Percentile Detect
Concentration (mg/L)
Total
3.37
2.4
6.9
10.396
6.8
5.4
9.8
4.6
1.41
4.7
8.8
5.97
7.2
4.8
3.1
4.4
8.9
4.21
4.75
6.7
10.8
1.94
5.1
1.51
9.8
5.15
6.5
3.1
4.1
5.29
5.44
6.96
5.5
5
3
1.96
2
6.12
2.6
4.84
2.6
8.6
3.28
6.3
7.91
GW
3.8
2.44
7.1
10.17
7.5
5.5
9.9
4.66
1.41
4.7
8.8
5.7
7.47
4.85
5.3
4.9
9
4.26
4.8
6.7
10.8
2.02
5.17
1.79
9.8
5.16
6.6
3.01
4.4
5.4
5.46
7.41
5.7
5.1
3
1.96
2.4
6.82
2.6
5.06
2.7
8.6
3.69
6.87
7.5258
SW
1.39
2.34
6.19
10.7576
1.8
3.5
5.8
0.9
0.39
1.9
8.6
7.24
5.75
4.145
1.8
1.5
8.36
1.38
1.4
3.3
0.94
1
0.23
1.96
3.85
4.65
2.83
4.27
5.4
1.87
2
2.5
1.1
0.28
1.8
1.44
2.3
1.38
1.1
0.88
1.7
3.2
9.04
Maximum Detect
Concentration (mg/L)
Total
15.7
55
76
94.92
51
26
66.8
40
11
6.8
99
33.5
26.8
83
29
33.25
56.6
23
41.5
45
12.5
81
55.2
1.79
13.5
21
39.6
9.27
31.1
52
50.4
25.99
28.5
18.2
61
3.69
8.7
88
15.2
15
20.6
44
27.6
32.1
99
GW
15.7
55
76
94.92
51
26
66.8
40
11
6.8
99
33.5
26.8
83
29
33.25
56.6
23
41.5
45
12.5
81
55.2
1.79
13.5
21
39.6
9.27
31.1
52
50.4
25.99
28.5
18.2
61
3.69
7.7
88
15.2
15
20.6
44
27.6
32.1
99
SW
14.7
7.79
17
39.776
12.2
8.76
8.5
1.7
0.39
2
15
10.3
9.54
9.2
10
9.32
36.05
5.52
6.7
17
1.79
5.9
1.02
2.81
8.83
5.68
8.05
48.5
21.7
5.48
6.57
5.55
6
0.31
8.7
20.2
5.85
2.51
4.6
1.2
8.31
9.7
48.5
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A47b. Nitrate (as N) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
1,475
425
1,656
7,384
1,744
2,914
580
6,256
153
115
1,896
1,954
3,800
5,330
297
1,693
4,091
2,255
14,441
9,399
2,681
484
6,550
12
16
2,159
4,218
102
576
6,491
5,072
808
2,671
469
1,632
72
369
6,198
996
225
1,314
6,853
1,089
622
119,537
GW
1,267
352
1,596
6,628
1,432
2,872
577
6,230
151
103
1,856
1,885
3,682
5,272
141
1,572
4,006
2,181
14,371
9,293
2,595
463
6,411
6
16
2,139
4,181
96
554
5,981
4,924
703
2,446
459
1,565
68
176
5,817
932
209
1,255
6,835
915
551
114,764
SW
208
73
60
756
312
42
3
26
2
12
40
69
118
58
156
121
85
74
70
106
86
21
139
6
0
20
37
6
22
510
148
105
225
10
67
4
193
381
64
16
59
18
174
71
4,773
Total Population Served by Systems
Reporting
Total
711,941
4,741,994
6,292,367
38,517,529
5,256,456
2,786,657
778,333
18,864,052
55,522
1,309,687
2,653,095
1,206,328
9,589,450
5,489,766
4,609,304
8,738,206
5,276,313
950,021
8,678,174
4,892,585
4,337,423
365,667
7,350,067
25,377
16,071
746,993
8,258,138
705,705
997,901
12,319,219
10,675,300
2,010,183
3,182,057
968,534
3,575,289
139,171
5,686,766
25,381,472
2,638,256
1,742,737
596,093
4,378,408
1,493,668
519,761
229,508,036
GW
323,895
1,503,960
2,918,171
15,274,342
715,725
452,660
496,933
16,618,010
52,826
1,255,059
1,537,413
949,165
3,386,733
3,128,079
380,950
1,927,163
1,277,699
509,330
3,493,788
3,640,124
1,857,310
217,895
2,084,901
18,348
16,071
520,719
3,222,192
589,326
307,984
1,622,163
3,569,388
634,125
796,755
227,231
915,912
69,546
1,463,885
9,552,528
1,777,397
61,188
326,550
2,709,133
313,806
184,379
92,900,757
SW
388,046
3,238,034
3,374,196
23,243,187
4,540,731
2,333,997
281,400
2,246,042
2,696
54,628
1,115,682
257,163
6,202,717
2,361,687
4,228,354
6,811,043
3,998,614
440,691
5,184,386
1,252,461
2,480,113
147,772
5,265,166
7,029
0
226,274
5,035,946
116,379
689,917
10,697,056
7,105,912
1,376,058
2,385,302
741,303
2,659,377
69,625
4,222,881
15,828,944
860,859
1,681,549
269,543
1,669,275
1,179,862
335,382
136,607,279
Percent of Systems
with At Least One Detection
Total
73.424%
92.000%
95.350%
73.267%
82.626%
82.739%
56.724%
65.074%
45.098%
79.130%
69.937%
89.304%
35.474%
89.024%
97.306%
93.444%
63.994%
61.552%
70.134%
48.665%
0.634%
89.050%
80.534%
75.000%
87.500%
50.533%
87.767%
71.569%
94.792%
77.538%
59.286%
89.356%
60.651%
91.898%
78.125%
73.611%
90.244%
86.947%
95.382%
72.889%
73.744%
66.423%
76.584%
80.064%
69.942%
GW
73.402%
90.625%
95.426%
75.211%
82.612%
82.591%
56.499%
64.928%
44.371%
85.437%
69.450%
90.133%
33.650%
88.904%
94.326%
93.066%
63.230%
61.669%
69.988%
48.499%
0.655%
88.985%
80.206%
50.000%
87.500%
50.631%
87.682%
69.792%
95.487%
76.710%
58.123%
89.900%
60.180%
91.721%
77.188%
72.059%
81.250%
86.230%
95.386%
70.813%
73.466%
66.379%
72.568%
81.125%
69.466%
SW
73.558%
98.630%
93.333%
56.217%
82.692%
92.857%
100.000%
100.000%
100.000%
25.000%
92.500%
66.667%
92.373%
100.000%
100.000%
98.347%
100.000%
58.108%
100.000%
63.208%
0.000%
90.476%
95.683%
100.000%
0.000%
40.000%
97.297%
100.000%
77.273%
87.255%
97.973%
85.714%
65.778%
100.000%
100.000%
100.000%
98.446%
97.900%
95.313%
100.000%
79.661%
83.333%
97.701%
71.831%
81.374%
Percent of Population Served
with At Least One Detection
Total
80.836%
98.101%
98.848%
90.813%
89.674%
96.885%
87.817%
84.238%
26.991%
98.796%
87.709%
93.978%
87.480%
98.719%
99.765%
99.087%
96.482%
71.394%
93.727%
76.682%
0.053%
96.609%
94.642%
84.821%
99.403%
61.227%
96.841%
98.468%
97.033%
93.531%
93.794%
91.060%
85.106%
99.407%
96.973%
94.694%
96.775%
97.280%
99.627%
99.205%
71.139%
87.687%
96.637%
91.736%
90.952%
GW
63.191%
94.913%
97.549%
92.446%
90.041%
90.857%
80.918%
82.108%
23.265%
99.587%
79.196%
94.163%
67.663%
97.753%
97.157%
98.863%
85.472%
73.407%
84.420%
68.718%
0.123%
95.524%
91.410%
79.006%
99.403%
62.338%
92.013%
98.165%
97.440%
89.341%
81.470%
91.687%
74.157%
97.472%
88.182%
89.383%
90.016%
92.932%
99.484%
77.366%
80.114%
85.234%
84.803%
90.824%
85.648%
SW
95.565%
99.582%
99.971%
89.741%
89.616%
98.054%
100.000%
100.000%
100.000%
80.611%
99.438%
93.296%
98.300%
100.000%
100.000%
99.150%
100.000%
69.067%
100.000%
99.829%
0.000%
98.209%
95.921%
100.000%
0.000%
58.668%
99.930%
100.000%
96.852%
94.167%
99.985%
90.772%
88.763%
100.000%
100.000%
100.000%
99.119%
99.904%
99.924%
100.000%
60.266%
91.668%
99.785%
92.238%
94.559%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A47c. Nitrate (as N) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 10 mg/L
Total
7
3
105
639
41
20
51
19
1
0
114
47
74
163
3
33
225
32
203
235
1
2
66
0
2
14
161
0
14
96
58
42
25
9
17
0
0
120
4
4
5
309
3
6
2,973
GW
6
3
102
574
39
20
51
19
1
0
109
46
74
163
3
33
220
32
203
234
1
2
66
0
2
14
161
0
14
82
41
42
25
9
17
0
0
116
4
4
5
309
3
6
2,855
SW
1
0
3
65
2
0
0
0
0
0
5
1
0
0
0
0
5
0
0
1
0
0
0
0
0
0
0
0
0
14
17
0
0
0
0
0
0
4
0
0
0
0
0
0
118
Percent of Systems
with At Least One Detection
> 10 mg/L
Total
0.475%
0.706%
6.341%
8.654%
2.351%
0.686%
8.793%
0.304%
0.654%
0.000%
6.013%
2.405%
1.947%
3.058%
1.010%
1.949%
5.500%
1.419%
1.406%
2.500%
0.037%
0.413%
1.008%
0.000%
12.500%
0.648%
3.817%
0.000%
2.431%
1.479%
1.144%
5.198%
0.936%
1.919%
1.042%
0.000%
0.000%
1.936%
0.402%
1.778%
0.381%
4.509%
0.275%
0.965%
2.487%
GW
0.474%
0.852%
6.391%
8.660%
2.723%
0.696%
8.839%
0.305%
0.662%
0.000%
5.873%
2.440%
2.010%
3.092%
2.128%
2.099%
5.492%
1.467%
1.413%
2.518%
0.039%
0.432%
1.029%
0.000%
12.500%
0.655%
3.851%
0.000%
2.527%
1.371%
0.833%
5.974%
1.022%
1.961%
1.086%
0.000%
0.000%
1.994%
0.429%
1.914%
0.398%
4.521%
0.328%
1.089%
2.488%
SW
0.481%
0.000%
5.000%
8.598%
0.641%
0.000%
0.000%
0.000%
0.000%
0.000%
12.500%
1.449%
0.000%
0.000%
0.000%
0.000%
5.882%
0.000%
0.000%
0.943%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.745%
11.486%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.050%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.472%
Population Served by Systems
with At Least One Detection
> 10 mg/L
Total
1,973
9,709
824,186
12,672,259
30,389
2,337
33,594
121,275
100
0
458,504
76,149
18,196
28,385
1,110
8,597
68,736
4,449
103,836
68,623
25
245
38,376
0
254
1,912
67,792
0
3,979
190,619
1,352,964
30,307
21,245
1,835
5,064
0
0
397,138
1,643
586
779
120,396
3,087
6,440
16,777,093
GW
1,789
9,709
236,686
3,671,971
30,047
2,337
33,594
121,275
100
0
111,037
74,538
18,196
28,385
1,110
8,597
33,245
4,449
103,836
68,583
25
245
38,376
0
254
1,912
67,792
0
3,979
22,532
19,661
30,307
21,245
1,835
5,064
0
0
372,618
1,643
586
779
120,396
3,087
6,440
5,278,260
SW
184
0
587,500
9,000,288
342
0
0
0
0
0
347,467
1,611
0
0
0
0
35,491
0
0
40
0
0
0
0
0
0
0
0
0
168,087
1,333,303
0
0
0
0
0
0
24,520
0
0
0
0
0
0
11,498,833
Percent of Population Served
with At Least One Detection
> 10 mg/L
Total
0.277%
0.205%
13.098%
32.900%
0.578%
0.084%
4.316%
0.643%
0.180%
0.000%
17.282%
6.312%
0.190%
0.517%
0.024%
0.098%
1.303%
0.468%
1.197%
1.403%
0.001%
0.067%
0.522%
0.000%
1.580%
0.256%
0.821%
0.000%
0.399%
1.547%
12.674%
1.508%
0.668%
0.189%
0.142%
0.000%
0.000%
1.565%
0.062%
0.034%
0.131%
2.750%
0.207%
1.239%
7.310%
GW
0.552%
0.646%
8.111%
24.040%
4.198%
0.516%
6.760%
0.730%
0.189%
0.000%
7.222%
7.853%
0.537%
0.907%
0.291%
0.446%
2.602%
0.874%
2.972%
1.884%
0.001%
0.112%
1.841%
0.000%
1.580%
0.367%
2.104%
0.000%
1.292%
1.389%
0.551%
4.779%
2.666%
0.808%
0.553%
0.000%
0.000%
3.901%
0.092%
0.958%
0.239%
4.444%
0.984%
3.493%
5.682%
SW
0.047%
0.000%
17.412%
38.722%
0.008%
0.000%
0.000%
0.000%
0.000%
0.000%
31.144%
0.626%
0.000%
0.000%
0.000%
0.000%
0.888%
0.000%
0.000%
0.003%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.571%
18.763%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.155%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
8.417%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A47d. Nitrate (as N) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 5 mg/L
Total
50
18
356
1,670
161
226
173
169
2
3
326
214
276
525
30
178
989
126
773
740
1
14
415
0
4
61
750
7
70
480
245
177
162
42
84
0
10
324
58
14
26
1,096
34
31
11,110
GW
48
16
346
1,563
151
223
172
169
2
3
310
209
254
516
20
167
963
125
771
733
1
14
414
0
4
61
747
6
69
432
205
176
159
41
82
0
5
313
55
14
26
1,096
31
30
10,742
SW
2
2
10
107
10
3
1
0
0
0
16
5
22
9
10
11
26
1
2
7
0
0
1
0
0
0
3
1
1
48
40
1
3
1
2
0
5
11
3
0
0
0
3
1
368
Percent of Systems
with At Least One Detection
>5 mg/L
Total
3.390%
4.235%
21.498%
22.616%
9.232%
7.756%
29.828%
2.701%
1.307%
2.609%
17.194%
10.952%
7.263%
9.850%
10.101%
10.514%
24.175%
5.588%
5.353%
7.873%
0.037%
2.893%
6.336%
0.000%
25.000%
2.825%
17.781%
6.863%
12.153%
7.395%
4.830%
21.906%
6.065%
8.955%
5.147%
0.000%
2.710%
5.227%
5.823%
6.222%
1.979%
15.993%
3.122%
4.984%
9.294%
GW
3.788%
4.545%
21.679%
23.582%
10.545%
7.765%
29.809%
2.713%
1.325%
2.913%
16.703%
11.088%
6.898%
9.788%
14.184%
10.623%
24.039%
5.731%
5.365%
7.888%
0.039%
3.024%
6.458%
0.000%
25.000%
2.852%
17.867%
6.250%
12.455%
7.223%
4.163%
25.036%
6.500%
8.932%
5.240%
0.000%
2.841%
5.381%
5.901%
6.699%
2.072%
16.035%
3.388%
5.445%
9.360%
SW
0.962%
2.740%
16.667%
14.153%
3.205%
7.143%
33.333%
0.000%
0.000%
0.000%
40.000%
7.246%
18.644%
15.517%
6.410%
9.091%
30.588%
1.351%
2.857%
6.604%
0.000%
0.000%
0.719%
0.000%
0.000%
0.000%
8.108%
16.667%
4.545%
9.412%
27.027%
0.952%
1.333%
10.000%
2.985%
0.000%
2.591%
2.887%
4.688%
0.000%
0.000%
0.000%
1.724%
1.408%
7.710%
Population Served by Systems
with At Least One Detection
> 5 mg/L
Total
9,057
499,477
4,857,024
20,804,101
554,601
575,636
324,205
2,635,228
298
178,447
1,052,262
377,376
925,962
772,147
303,439
544,483
2,098,269
25,622
188,139
238,840
25
2,496
183,465
0
824
9,851
1,314,286
73,300
100,310
429,465
2,347,748
192,596
102,735
176,320
36,275
0
86,781
841,164
739,205
2,189
3,508
479,285
21,391
12,492
44,120,324
GW
8,753
204,734
1,758,792
8,729,361
116,384
81,581
288,075
2,635,228
298
178,447
362,351
169,761
311,249
391,303
78,712
326,312
199,022
25,382
183,571
191,016
25
2,496
183,386
0
824
9,851
633,553
599
43,810
169,896
143,320
192,469
87,075
72,404
27,095
0
6,380
553,205
405,855
2,189
3,508
479,285
19,341
12,462
19,289,360
SW
304
294,743
3,098,232
12,074,740
438,217
494,055
36,130
0
0
0
689,911
207,615
614,713
380,844
224,727
218,171
1,899,247
240
4,568
47,824
0
0
79
0
0
0
680,733
72,701
56,500
259,569
2,204,428
127
15,660
103,916
9,180
0
80,401
287,959
333,350
0
0
0
2,050
30
24,830,964
Percent of Population Served
with At Least One Detection
>5 mg/L
Total
1.272%
10.533%
77.189%
54.012%
10.551%
20.657%
41.654%
13.970%
0.537%
13.625%
39.662%
31.283%
9.656%
14.065%
6.583%
6.231%
39.768%
2.697%
2.168%
4.882%
0.001%
0.683%
2.496%
0.000%
5.127%
1.319%
15.915%
10.387%
10.052%
3.486%
21.992%
9.581%
3.229%
18.205%
1.015%
0.000%
1.526%
3.314%
28.019%
0.126%
0.588%
10.947%
1.432%
2.403%
19.224%
GW
2.702%
13.613%
60.270%
57.150%
16.261%
18.023%
57.971%
15.858%
0.564%
14.218%
23.569%
17.885%
9.190%
12.509%
20.662%
16.932%
15.577%
4.983%
5.254%
5.248%
0.001%
1.146%
8.796%
0.000%
5.127%
1.892%
19.662%
0.102%
14.225%
10.473%
4.015%
30.352%
10.929%
31.864%
2.958%
0.000%
0.436%
5.791%
22.834%
3.577%
1.074%
17.691%
6.163%
6.759%
20.763%
SW
0.078%
9.103%
91.821%
51.950%
9.651%
21.168%
12.839%
0.000%
0.000%
0.000%
61.838%
80.733%
9.910%
16.126%
5.315%
3.203%
47.498%
0.054%
0.088%
3.818%
0.000%
0.000%
0.002%
0.000%
0.000%
0.000%
13.517%
62.469%
8.189%
2.427%
31.022%
0.009%
0.657%
14.018%
0.345%
0.000%
1.904%
1.819%
38.723%
0.000%
0.000%
0.000%
0.174%
0.009%
18.177%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A48. Nitrite (as N) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 1 mg/L
> 0.5 mg/L
> 1 mg/L
> 0.5 mg/L
> 1 mg/L
> 0.5 mg/L
Total # Systems
Reporting
82,738
82,738
3,575
3,575
86,313
86,313
# Systems Exceeding
Threshold of Interest
584
1,241
51
112
635
1,353
% Systems Exceeding
Threshold of Interest
0.706%
1.500%
1.427%
3.133%
0.736%
1.568%
Total Pop. Served by
Systems Reporting
81,271,403
81,271,403
126,713,410
126,713,410
207,984,813
207,984,813
Total Pop. Served by
Systems Exceeding
Threshold of Interest
729,751
4,915,364
9,337,280
21,530,847
10,067,031
26,446,211
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.898%
6.048%
7.369%
16.992%
4.840%
12.715%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A48a. Nitrite (as N) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
1,142
2,879
13,349
61,630
5,507
15,902
1,655
15,279
100
3,191
3,909
4,604
12,758
3,892
2,980
8,618
6,993
10,450
76,978
3,053
12,519
1,249
9,024
22
18
17,114
8,331
1,055
3,421
7,166
37,022
1,783
1,699
5,601
1,993
380
427
7,373
11,119
281
1,845
9,603
1,025
2,236
397,175
GW
862
2,027
11,013
39,623
4,368
15,115
1,615
15,040
98
3,100
3,817
4,209
12,190
3,738
958
6,056
6,491
9,894
76,172
3,014
12,068
1,171
8,603
10
18
16,580
7,246
985
2,823
6,448
29,534
1,591
1,297
5,242
1,895
366
229
6,132
9,322
246
1,801
9,428
916
1,855
345,206
SW
280
852
2,336
22,007
1,139
787
40
239
2
91
92
395
568
154
2,022
2,562
502
556
806
39
451
78
421
12
0
534
1,085
70
598
718
7,488
192
402
359
98
14
198
1,241
1,797
35
44
175
109
381
51,969
Percent of Samples
with Detections
Total
3.327%
3.925%
1.671%
3.060%
2.760%
15.042%
1.148%
10.393%
3.000%
0.000%
17.268%
5.778%
4.264%
38.849%
7.886%
20.144%
15.301%
3.330%
26.900%
12.152%
46.945%
3.843%
4.588%
54.545%
0.000%
0.801%
6.926%
1.611%
2.426%
5.261%
0.500%
6.169%
1.413%
2.999%
2.408%
4.737%
3.747%
16.805%
38.789%
7.117%
4.065%
12.517%
8.390%
8.274%
12.365%
GW
3.712%
3.503%
1.780%
4.013%
2.930%
15.250%
1.115%
9.801%
3.061%
0.000%
17.448%
6.296%
4.405%
38.604%
9.395%
15.258%
13.326%
3.275%
26.935%
12.309%
45.956%
3.928%
4.719%
20.000%
0.000%
0.820%
7.439%
1.726%
2.515%
4.777%
0.582%
6.411%
1.696%
3.052%
2.375%
4.918%
4.803%
15.248%
41.525%
6.911%
4.109%
12.548%
8.297%
9.003%
13.251%
SW
2.143%
4.930%
1.156%
1.345%
2.107%
11.055%
2.500%
47.699%
0.000%
0.000%
9.783%
0.253%
1.232%
44.805%
7.171%
31.694%
40.837%
4.317%
23.573%
0.000%
73.392%
2.564%
1.900%
83.333%
0.000%
0.187%
3.502%
0.000%
2.007%
9.610%
0.174%
4.167%
0.498%
2.228%
3.061%
0.000%
2.525%
24.496%
24.597%
8.571%
2.273%
10.857%
9.174%
4.724%
6.477%
Minimum Detect
Concentration (mg/L)
Total
0.001
0.002
0.004
1E-06
0.002
0.0001
0.03
0.001
0.06
0.0003
0.002
0.007
0.0007
0.0001
0.0004
0.001
0.008
0.0023
0.001
0.01
0.01
0.002
0.03
0.001
0.0003
0.01
0.01
0.00001
0.00014
0.05
0.004
0.005
0.02
0.02
0.01
0.01
0.01
0.001
0.002
0.001
0.003
0.007
1E-06
GW
0.001
0.002
0.004
1E-06
0.002
0.0001
0.05
0.001
0.06
0.0003
0.002
0.01
0.0007
0.0001
0.0004
0.001
0.008
0.0023
0.001
0.01
0.01
0.002
0.04
0.001
0.0003
0.01
0.01
0.00001
0.00014
0.05
0.004
0.005
0.02
0.02
0.01
0.01
0.01
0.001
0.002
0.001
0.003
0.007
1E-06
SW
0.02
0.003
0.006
2E-06
0.002
0.002
0.03
0.001
0.02
0.01
0.007
0.001
0.002
0.004
0.001
0.01
0.01
0.05
0.01
0.01
0.03
0.59
0.004
0.01
0.005
0.05
0.05
0.1
0.02
0.02
0.01
0.01
0.01
0.01
0.05
0.007
0.01
0.009
2E-06
Median Detect
Concentration (mg/L)
Total
0.075
0.03
0.05
0.004
0.03
0.01
0.1
0.01
0.07
0.2
0.009
0.32
0.05
0.01
0.02
0.005
0.01
0.01
0.02
0.31
0.035
0.02
0.08
0.1
0.01
0.11
0.09
0.04
0.11
0.06
0.04
0.03
0.03
0.07
0.02
0.02
0.26
0.09
0.02
0.01
0.05
0.2
0.02
GW
0.07
0.02
0.055
0.003
0.06
0.01
0.1
0.01
0.07
0.2
0.009
0.32
0.05
0.01
0.01
0.005
0.01
0.01
0.02
0.3
0.04
0.02
0.07
0.1
0.01
0.11
0.09
0.04
0.1
0.06
0.035
0.03
0.03
0.07
0.02
0.02
0.27
0.1
0.02
0.01
0.05
0.2
0.02
SW
0.28
0.045
0.05
0.03
0.015
0.01
0.03
0.02
0.02
0.01
0.2
0.005
0.02
0.03
0.009
0.01
0.01
0.32
0.01
0.045
0.08
0.59
0.02
0.075
0.02
0.19
0.06
0.35
0.02
0.03
0.02
0.02
0.2
0.05
0.05
0.01
0.125
0.125
0.03
90th Percentile Detect
Concentration (mg/L)
Total
0.65
0.3
0.48
0.34
0.56
0.1
2.4
0.17
0.3
0.7
0.14
1.12
0.1
0.1
0.09
0.175
0.07
0.03
0.27
1.89
1.69
0.24
0.17
0.64
0.14
3.99
0.5
0.99
0.38
0.11
0.3
0.09
0.11
0.4
0.1
0.22
0.62
0.59
0.12
0.19
0.77
0.45
0.4
GW
0.65
0.25
0.52
0.2
0.58
0.1
2.4
0.16
0.3
0.7
0.14
1.12
0.1
0.08
0.05
0.2
0.07
0.03
0.27
1.88
1.69
0.23
0.1
0.64
0.14
3.99
0.61
1
0.38
0.11
0.28
0.09
0.11
0.4
0.1
0.22
0.62
0.68
0.12
0.19
0.77
0.47
0.4
SW
0.5
0.36
0.3
0.5
0.27
0.05
0.03
0.29
0.7
0.01
0.46
0.05
0.1
0.12
0.02
0.05
0.025
2.25
0.01
0.27
0.2
0.59
0.17
0.24
0.37
0.4
0.07
0.6
0.03
0.03
0.05
0.17
0.66
0.5
0.05
0.2
0.74
0.33
0.45
Maximum Detect
Concentration (mg/L)
Total
4.64
2.03
5.8
7.31
3.51
3.44
6.1
2.3
0.3
4
2.1
2.2
5.6
5
5
13
1.2
9.49
2.1
9.94
2.39
4.1
0.23
1.17
5.4
3.99
2.2
9.87
1.15
0.69
1.5
0.54
0.73
0.4
0.15
1.88
7.75
0.83
0.66
2.4
4.67
1.1
13
GW
4.64
2.03
5.8
6.1
3.51
3.44
6.1
2.3
0.3
4
2.1
2.2
5.6
1
2.28
13
1.2
9.49
2.1
9.94
2.39
4.1
0.1
1.17
5.4
3.99
2.2
9.87
1.15
0.69
1.5
0.54
0.73
0.4
0.15
1.88
7.75
0.83
0.66
2.4
4.67
1.1
13
SW
0.5
2.03
0.5
7.31
0.64
1.09
0.03
1.17
0.7
0.01
0.46
0.14
5
5
8.1
0.1
0.91
8.68
0.01
0.27
0.23
0.59
0.53
0.27
7.6
0.48
0.07
0.6
0.03
0.03
0.05
1.56
2.8
0.5
0.05
0.2
1.05
0.36
8.68
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A48b. Nitrite (as N) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
696
372
1,554
5,848
1,337
2,914
471
6,255
58
115
987
1,595
3,710
2,240
294
1,618
3,026
2,122
13,403
2,393
2,612
492
4,927
12
11
2,630
1,911
544
566
2,386
5,053
787
989
469
1,141
300
84
3,673
947
177
800
3,751
451
592
86,313
GW
574
299
1,495
5,158
1,092
2,872
468
6,229
57
103
966
1,537
3,593
2,218
139
1,500
2,967
2,048
13,333
2,360
2,527
471
4,836
6
11
2,589
1,877
522
544
2,208
4,906
691
853
459
1,088
289
52
3,333
884
165
111
3,731
390
521
82,738
SW
122
73
59
690
245
42
3
26
1
12
21
58
117
22
155
118
59
74
70
33
85
21
91
6
0
41
34
22
22
178
147
96
136
10
53
11
32
340
63
12
23
20
61
71
3,575
Total Population Served by Systems
Reporting
Total
454,495
4,730,976
6,270,215
37,944,827
4,514,859
2,786,657
739,114
18,740,484
39,440
1,309,687
1,597,084
1,141,810
9,533,963
3,407,638
4,608,962
8,656,220
4,890,003
932,430
8,557,544
1,690,318
4,323,075
372,908
5,676,016
25,377
15,414
1,281,333
7,167,350
1,432,779
997,503
9,658,089
10,672,352
1,948,185
2,855,851
968,534
3,200,533
334,779
2,349,183
22,322,690
2,608,294
1,899,919
209,994
4,182,062
423,068
512,799
207,984,813
GW
154,431
1,492,942
2,896,223
14,925,008
606,463
452,660
457,714
16,494,442
36,769
1,255,059
706,789
887,213
3,348,644
1,613,340
380,728
1,919,553
1,005,870
491,739
3,373,158
1,653,867
1,843,168
225,136
1,402,478
18,348
15,414
731,534
2,454,112
1,241,815
307,586
590,778
3,566,540
623,862
519,515
227,231
691,636
202,039
1,014,599
6,694,172
1,747,635
51,267
157,872
2,490,318
124,414
177,322
81,271,403
SW
300,064
3,238,034
3,373,992
23,019,819
3,908,396
2,333,997
281,400
2,246,042
2,671
54,628
890,295
254,597
6,185,319
1,794,298
4,228,234
6,736,667
3,884,133
440,691
5,184,386
36,451
2,479,907
147,772
4,273,538
7,029
0
549,799
4,713,238
190,964
689,917
9,067,311
7,105,812
1,324,323
2,336,336
741,303
2,508,897
132,740
1,334,584
15,628,518
860,659
1,848,652
52,122
1,691,744
298,654
335,477
126,713,410
Percent of Systems
with At Least One Detection
Total
5.316%
18.011%
9.781%
5.797%
9.200%
29.822%
2.972%
15.172%
5.172%
0.000%
12.563%
10.972%
3.639%
49.152%
44.898%
30.532%
20.489%
10.697%
58.875%
12.787%
57.274%
7.927%
7.489%
58.333%
0.000%
3.004%
14.966%
3.125%
9.541%
12.028%
3.028%
11.563%
2.224%
14.072%
3.330%
5.667%
5.952%
20.120%
70.116%
9.605%
8.000%
21.354%
16.630%
20.101%
22.318%
GW
5.401%
15.385%
9.097%
5.409%
9.615%
29.666%
2.778%
14.962%
5.263%
0.000%
12.526%
11.321%
3.590%
49.188%
37.410%
30.067%
19.953%
10.498%
58.756%
12.966%
56.074%
8.068%
7.486%
33.333%
0.000%
3.013%
14.598%
3.257%
9.007%
11.005%
2.915%
12.012%
2.345%
13.508%
3.309%
5.882%
5.769%
17.612%
69.118%
9.091%
8.108%
21.094%
16.667%
19.962%
22.285%
SW
4.918%
28.767%
27.119%
8.696%
7.347%
40.476%
33.333%
65.385%
0.000%
0.000%
14.286%
1.724%
5.128%
45.455%
51.613%
36.441%
47.458%
16.216%
81.429%
0.000%
92.941%
4.762%
7.692%
83.333%
0.000%
2.439%
35.294%
0.000%
22.727%
24.719%
6.803%
8.333%
1.471%
40.000%
3.774%
0.000%
6.250%
44.706%
84.127%
16.667%
4.348%
70.000%
16.393%
21.127%
23.077%
Percent of Population Served
with At Least One Detection
Total
1.793%
36.410%
61.943%
40.388%
15.075%
47.380%
22.971%
49.287%
0.231%
0.000%
19.760%
13.402%
4.358%
47.527%
60.117%
67.478%
76.067%
16.172%
87.342%
16.859%
77.989%
6.858%
9.128%
31.690%
0.000%
3.277%
55.856%
8.100%
71.444%
75.311%
3.008%
6.261%
2.644%
26.731%
2.174%
4.419%
17.790%
68.120%
89.438%
39.325%
14.001%
42.046%
20.606%
36.868%
44.615%
GW
3.350%
20.014%
37.184%
35.422%
9.211%
31.292%
6.507%
50.043%
0.247%
0.000%
19.042%
15.664%
11.051%
59.771%
26.099%
48.304%
16.094%
17.170%
77.358%
17.231%
49.197%
11.301%
20.793%
15.239%
0.000%
5.673%
28.781%
9.346%
16.989%
14.517%
3.367%
12.822%
11.102%
15.246%
0.664%
7.323%
0.027%
52.194%
85.521%
8.848%
18.567%
48.058%
21.382%
37.750%
36.640%
SW
0.991%
43.969%
83.196%
43.607%
15.985%
50.501%
49.751%
43.736%
0.000%
0.000%
20.330%
5.519%
0.735%
36.519%
63.180%
72.942%
91.598%
15.059%
93.838%
0.000%
99.389%
0.088%
5.300%
74.634%
0.000%
0.087%
69.954%
0.000%
95.721%
79.272%
2.828%
3.170%
0.764%
30.251%
2.590%
0.000%
31.294%
74.941%
97.393%
40.171%
0.173%
33.196%
20.282%
36.402%
49.731%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A48c. Nitrite (as N) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 1 mg/L
Total
3
3
5
18
3
8
4
6
0
0
14
4
12
7
2
5
19
1
25
4
355
3
4
0
0
2
4
3
3
29
2
0
1
0
0
0
0
14
60
0
0
7
4
1
635
GW
3
1
5
14
3
6
4
3
0
0
14
4
12
7
0
3
17
1
25
4
338
3
4
0
0
2
4
3
3
26
2
0
1
0
0
0
0
9
52
0
0
7
3
1
584
SW
0
2
0
4
0
2
0
3
0
0
0
0
0
0
2
2
2
0
0
0
17
0
0
0
0
0
0
0
0
3
0
0
0
0
0
0
0
5
8
0
0
0
1
0
51
Percent of Systems
with At Least One Detection
> 1 mg/L
Total
0.431%
0.806%
0.322%
0.308%
0.224%
0.275%
0.849%
0.096%
0.000%
0.000%
1.418%
0.251%
0.323%
0.313%
0.680%
0.309%
0.628%
0.047%
0.187%
0.167%
13.591%
0.610%
0.081%
0.000%
0.000%
0.076%
0.209%
0.551%
0.530%
1.215%
0.040%
0.000%
0.101%
0.000%
0.000%
0.000%
0.000%
0.381%
6.336%
0.000%
0.000%
0.187%
0.887%
0.169%
0.736%
GW
0.523%
0.334%
0.334%
0.271%
0.275%
0.209%
0.855%
0.048%
0.000%
0.000%
1.449%
0.260%
0.334%
0.316%
0.000%
0.200%
0.573%
0.049%
0.188%
0.169%
13.376%
0.637%
0.083%
0.000%
0.000%
0.077%
0.213%
0.575%
0.551%
1.178%
0.041%
0.000%
0.117%
0.000%
0.000%
0.000%
0.000%
0.270%
5.882%
0.000%
0.000%
0.188%
0.769%
0.192%
0.706%
SW
0.000%
2.740%
0.000%
0.580%
0.000%
4.762%
0.000%
11.538%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.290%
1.695%
3.390%
0.000%
0.000%
0.000%
20.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.685%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.471%
12.698%
0.000%
0.000%
0.000%
1.639%
0.000%
1.427%
Population Served by Systems
with At Least One Detection
> 1 mg/L
Total
295
671,155
32,937
4,624,393
626
40,363
11,262
142,645
0
0
22,956
185
6,435
2,152
50,976
78,781
1,712,779
85
3,125
2,292
771,834
2,343
1,495
0
0
1,350
12,800
410
765
4,247
1,517
0
175
0
0
0
0
1,133,205
690,018
0
0
28,254
15,086
90
10,067,031
GW
295
9,321
32,937
120,741
626
2,215
11,262
588
0
0
22,956
185
6,435
2,152
0
32,715
2,737
85
3,125
2,292
134,534
2,343
1,495
0
0
1,350
12,800
410
765
4,149
1,517
0
175
0
0
0
0
42,897
241,972
0
0
28,254
6,333
90
729,751
SW
0
661,834
0
4,503,652
0
38,148
0
142,057
0
0
0
0
0
0
50,976
46,066
1,710,042
0
0
0
637,300
0
0
0
0
0
0
0
0
98
0
0
0
0
0
0
0
1,090,308
448,046
0
0
0
8,753
0
9,337,280
Percent of Population Served
with At Least One Detection
> 1 mg/L
Total
0.065%
14.186%
0.525%
12.187%
0.014%
1.448%
1.524%
0.761%
0.000%
0.000%
1.437%
0.016%
0.067%
0.063%
1.106%
0.910%
35.026%
0.009%
0.037%
0.136%
17.854%
0.628%
0.026%
0.000%
0.000%
0.105%
0.179%
0.029%
0.077%
0.044%
0.014%
0.000%
0.006%
0.000%
0.000%
0.000%
0.000%
5.076%
26.455%
0.000%
0.000%
0.676%
3.566%
0.018%
4.840%
GW
0.191%
0.624%
1.137%
0.809%
0.103%
0.489%
2.460%
0.004%
0.000%
0.000%
3.248%
0.021%
0.192%
0.133%
0.000%
1.704%
0.272%
0.017%
0.093%
0.139%
7.299%
1.041%
0.107%
0.000%
0.000%
0.185%
0.522%
0.033%
0.249%
0.702%
0.043%
0.000%
0.034%
0.000%
0.000%
0.000%
0.000%
0.641%
13.846%
0.000%
0.000%
1.135%
5.090%
0.051%
0.898%
SW
0.000%
20.439%
0.000%
19.564%
0.000%
1.634%
0.000%
6.325%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.206%
0.684%
44.026%
0.000%
0.000%
0.000%
25.699%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.976%
52.058%
0.000%
0.000%
0.000%
2.931%
0.000%
7.369%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A48d. Nitrite (as N) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.5 mg/L
Total
7
7
17
52
18
26
5
28
0
0
27
10
30
13
6
9
29
3
61
4
616
5
19
0
0
11
16
4
9
53
6
1
2
1
1
0
0
38
179
2
3
20
10
5
1,353
GW
5
3
16
39
16
24
5
24
0
0
26
10
30
13
2
6
26
3
60
4
584
5
19
0
0
10
15
4
9
48
6
1
1
1
1
0
0
26
161
1
3
20
9
5
1,241
SW
2
4
1
13
2
2
0
4
0
0
1
0
0
0
4
3
3
0
1
0
32
0
0
0
0
1
1
0
0
5
0
0
1
0
0
0
0
12
18
1
0
0
1
0
112
Percent of Systems
with At Least One Detection
> 0.5 mg/L
Total
1.006%
1.882%
1.094%
0.889%
1.346%
0.892%
1.062%
0.448%
0.000%
0.000%
2.736%
0.627%
0.809%
0.580%
2.041%
0.556%
0.958%
0.141%
0.455%
0.167%
23.583%
1.016%
0.386%
0.000%
0.000%
0.418%
0.837%
0.735%
1.590%
2.221%
0.119%
0.127%
0.202%
0.213%
0.088%
0.000%
0.000%
1.035%
18.902%
1.130%
0.375%
0.533%
2.217%
0.845%
1.568%
GW
0.871%
1.003%
1.070%
0.756%
1.465%
0.836%
1.068%
0.385%
0.000%
0.000%
2.692%
0.651%
0.835%
0.586%
1.439%
0.400%
0.876%
0.146%
0.450%
0.169%
23.110%
1.062%
0.393%
0.000%
0.000%
0.386%
0.799%
0.766%
1.654%
2.174%
0.122%
0.145%
0.117%
0.218%
0.092%
0.000%
0.000%
0.780%
18.213%
0.606%
0.386%
0.536%
2.308%
0.960%
1.500%
SW
1.639%
5.479%
1.695%
1.884%
0.816%
4.762%
0.000%
15.385%
0.000%
0.000%
4.762%
0.000%
0.000%
0.000%
2.581%
2.542%
5.085%
0.000%
1.429%
0.000%
37.647%
0.000%
0.000%
0.000%
0.000%
2.439%
2.941%
0.000%
0.000%
2.809%
0.000%
0.000%
0.735%
0.000%
0.000%
0.000%
0.000%
3.529%
28.571%
8.333%
0.000%
0.000%
1.639%
0.000%
3.133%
Population Served by Systems
with At Least One Detection
> 0.5 mg/L
Total
2,574
753,676
63,508
5,826,393
68,287
43,345
13,262
2,953,977
0
0
57,571
580
35,425
4,423
58,822
198,422
3,423,814
1,630
44,972
2,292
2,339,658
3,168
4,629
0
0
3,147
797,792
510
17,412
6,812,556
5,137
432
6,875
150
36
0
0
1,633,073
1,185,969
6,325
285
49,027
25,152
1,905
26,446,211
GW
2,335
25,899
63,368
575,592
4,484
5,197
13,262
2,569,796
0
0
56,999
580
35,425
4,423
1,342
50,976
3,772
1,630
39,487
2,292
302,964
3,168
4,629
0
0
2,667
121,538
510
17,412
7,179
5,137
432
175
150
36
0
0
265,724
659,143
25
285
49,027
16,399
1,905
4,915,364
SW
239
727,777
140
5,250,801
63,803
38,148
0
384,181
0
0
572
0
0
0
57,480
147,446
3,420,042
0
5,485
0
2,036,694
0
0
0
0
480
676,254
0
0
6,805,377
0
0
6,700
0
0
0
0
1,367,349
526,826
6,300
0
0
8,753
0
21,530,847
Percent of Population Served
with At Least One Detection
> 0.5 mg/L
Total
0.566%
15.931%
1.013%
15.355%
1.512%
1.555%
1.794%
15.763%
0.000%
0.000%
3.605%
0.051%
0.372%
0.130%
1.276%
2.292%
70.017%
0.175%
0.526%
0.136%
54.120%
0.850%
0.082%
0.000%
0.000%
0.246%
11.131%
0.036%
1.746%
70.537%
0.048%
0.022%
0.241%
0.015%
0.001%
0.000%
0.000%
7.316%
45.469%
0.333%
0.136%
1.172%
5.945%
0.371%
12.715%
GW
1.512%
1.735%
2.188%
3.857%
0.739%
1.148%
2.897%
15.580%
0.000%
0.000%
8.065%
0.065%
1.058%
0.274%
0.352%
2.656%
0.375%
0.331%
1.171%
0.139%
16.437%
1.407%
0.330%
0.000%
0.000%
0.365%
4.952%
0.041%
5.661%
1.215%
0.144%
0.069%
0.034%
0.066%
0.005%
0.000%
0.000%
3.969%
37.716%
0.049%
0.181%
1.969%
13.181%
1.074%
6.048%
SW
0.080%
22.476%
0.004%
22.810%
1.632%
1.634%
0.000%
17.105%
0.000%
0.000%
0.064%
0.000%
0.000%
0.000%
1.359%
2.189%
88.052%
0.000%
0.106%
0.000%
82.128%
0.000%
0.000%
0.000%
0.000%
0.087%
14.348%
0.000%
0.000%
75.054%
0.000%
0.000%
0.287%
0.000%
0.000%
0.000%
0.000%
8.749%
61.212%
0.341%
0.000%
0.000%
2.931%
0.000%
16.992%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A49. Oxamyl (Vydate) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 200 ug/L
> 100 ug/L
> 2 ug/L
> 200 ug/L
> 100 ug/L
> 2 ug/L
> 200 ug/L
> 100 ug/L
> 2 ug/L
Total # Systems
Reporting
28,100
28,100
28,100
2,776
2,776
2,776
30,876
30,876
30,876
# Systems Exceeding
Threshold of Interest
0
0
14
1
1
4
1
1
18
% Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.050%
0.036%
0.036%
0.144%
0.003%
0.003%
0.058%
Total Pop. Served by
Systems Reporting
61,701,854
61,701,854
61,701,854
105,676,577
105,676,577
105,676,577
167,378,431
167,378,431
167,378,431
Total Pop. Served by
Systems Exceeding
Threshold of Interest
0
0
38,142
200
200
258,348
200
200
296,490
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.062%
0.000%
0.000%
0.244%
0.000%
0.000%
0.177%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A49a. Oxamyl (Vydate) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
32
503
1,544
6,376
12,095
2,375
1,310
1,248
2,360
1,428
1,694
49
1,177
3,013
2,241
1,743
2,922
2,355
357
6,607
4,577
4,610
2,851
12,775
60
2,345
4,193
158
4,260
1,535
2,866
531
5
2,054
471
2,998
898
79
829
7,103
415
1,287
3,161
640
1,250
113,380
GW
14
374
1,318
4,952
6,951
1,709
1,001
1,218
2,295
1,355
1,646
32
965
2,624
2,081
441
2,157
1,632
300
6,340
4,443
4,040
2,583
11,736
41
2,279
3,874
145
4,011
1,144
2,154
381
5
1,570
316
2,625
787
13
706
5,915
154
1,097
3,069
334
939
93,766
SW
18
129
226
1,424
5,144
666
309
30
65
73
48
17
212
389
160
1,302
765
723
57
267
134
570
268
1,039
19
66
319
13
249
391
712
150
0
484
155
373
111
66
123
1,188
261
190
92
306
311
19,614
Percent of Samples
with Detections
Total
0.000%
0.000%
0.000%
0.125%
0.008%
0.000%
0.992%
0.481%
0.636%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.459%
0.000%
0.679%
0.000%
0.000%
0.000%
0.000%
0.035%
0.008%
0.000%
0.000%
0.000%
0.000%
0.047%
0.000%
0.070%
0.000%
0.000%
0.000%
0.212%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.311%
0.000%
1.563%
0.000%
0.078%
GW
0.000%
0.000%
0.000%
0.141%
0.000%
0.000%
1.299%
0.493%
0.654%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.797%
0.000%
0.000%
0.000%
0.000%
0.039%
0.009%
0.000%
0.000%
0.000%
0.000%
0.050%
0.000%
0.093%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.365%
0.000%
1.796%
0.000%
0.075%
SW
0.000%
0.000%
0.000%
0.070%
0.019%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.614%
0.000%
0.415%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.645%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.307%
0.000%
0.092%
Minimum Detect
Concentration (u.g/L)
Total
0.5
531.1
1
0.53
0.18
1.28
2
3.3
5.01
1.5
0.5
1.2
0.5
0.5
0.18
GW
0.5
1
0.53
0.18
5
3.3
5.01
1.5
0.5
0.5
0.53
0.18
SW
0.5
531.1
1.28
2
1.2
0.5
0.5
Median Detect
Concentration (u.g/L)
Total
0.5
531.1
1
0.53
0.5
2
5
3.3
5.01
1.6
0.75
1.2
0.5
0.83
1
GW
0.5
1
0.53
0.5
5
3.3
5.01
1.6
0.75
0.5
0.53
1
SW
0.5
531.1
2
2
1.2
1.13
2
90th Percentile Detect
Concentration (u.g/L)
Total
2
531.1
1
0.53
4
2.6
5
3.3
5.01
1.7
1
1.2
0.5
20.565
5
GW
2
1
0.53
4
5
3.3
5.01
1.7
1
0.5
1.13
5
SW
0.5
531.1
2.6
2
1.2
40
40
Maximum Detect
Concentration (u.g/L)
Total
2
531.1
1
0.53
4
2.6
5
3.3
5.01
1.7
1
1.2
0.5
40
531.1
GW
2
1
0.53
4
5
3.3
5.01
1.7
1
0.5
1.13
5.01
SW
0.5
531.1
2.6
2
1.2
40
531.1
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A49b. Oxamyl (Vydate) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
8
171
454
912
1,397
795
652
238
1,310
296
110
5
492
1,153
1,402
243
644
856
208
2,931
1,282
1,461
812
2,365
28
712
1,237
128
696
291
1,343
269
3
1,082
72
778
259
26
669
426
174
438
1,405
339
304
30,876
GW
6
126
382
864
1,130
578
615
235
1,289
283
98
4
466
1,052
1,358
93
527
790
185
2,870
1,253
1,385
752
2,228
22
701
1,196
118
660
270
1,113
190
3
932
63
719
238
7
606
389
65
404
1,385
194
256
28,100
SW
2
45
72
48
267
217
37
3
21
13
12
1
26
101
44
150
117
66
23
61
29
76
60
137
6
11
41
10
36
21
230
79
0
150
9
59
21
19
63
37
109
34
20
145
48
2,776
Total Population Served by Systems
Reporting
Total
22,575
2,702,037
2,453,348
6,035,739
32,699,061
4,978,003
2,588,853
650,290
16,786,098
994,603
1,300,849
162,247
857,411
9,103,561
4,866,706
4,612,320
8,509,572
4,901,793
471,954
7,228,834
3,931,466
2,643,059
753,305
6,885,177
47,665
1,453,178
945,754
1,906,326
1,663,162
960,557
4,921,839
6,465,862
905
2,935,110
894,778
3,428,914
621,074
1,255,969
2,803,106
2,500,671
2,312,591
432,235
3,883,163
1,360,534
446,177
167,378,431
GW
13,611
589,449
910,322
2,665,148
11,168,297
511,369
261,586
368,890
14,546,922
305,252
1,246,221
27,630
639,629
2,907,639
2,546,970
375,460
1,707,190
906,003
108,050
2,048,978
2,681,825
1,698,598
360,636
1,733,551
40,636
676,698
395,955
343,608
1,400,264
270,666
980,149
483,522
905
570,360
154,800
802,131
261,903
157,598
435,220
1,667,485
26,001
180,711
2,191,419
203,368
129,229
61,701,854
SW
8,964
2,112,588
1,543,026
3,370,591
21,530,764
4,466,634
2,327,267
281,400
2,239,176
689,351
54,628
134,617
217,782
6,195,922
2,319,736
4,236,860
6,802,382
3,995,790
363,904
5,179,856
1,249,641
944,461
392,669
5,151,626
7,029
776,480
549,799
1,562,718
262,898
689,891
3,941,690
5,982,340
0
2,364,750
739,978
2,626,783
359,171
1,098,371
2,367,886
833,186
2,286,590
251,524
1,691,744
1,157,166
316,948
105,676,577
Percent of Systems
with At Least One Detection
Total
0.000%
0.000%
0.000%
0.548%
0.072%
0.000%
1.840%
2.521%
0.687%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.881%
0.000%
1.402%
0.000%
0.000%
0.000%
0.000%
0.123%
0.042%
0.000%
0.000%
0.000%
0.000%
0.287%
0.000%
0.149%
0.000%
0.000%
0.000%
1.389%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.913%
0.000%
2.360%
0.000%
0.230%
GW
0.000%
0.000%
0.000%
0.463%
0.000%
0.000%
1.951%
2.553%
0.698%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.266%
0.000%
0.000%
0.000%
0.000%
0.133%
0.045%
0.000%
0.000%
0.000%
0.000%
0.303%
0.000%
0.180%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.990%
0.000%
3.093%
0.000%
0.203%
SW
0.000%
0.000%
0.000%
2.083%
0.375%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.667%
0.000%
3.030%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
11.111%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.379%
0.000%
0.504%
Percent of Population Served
with At Least One Detection
Total
0.000%
0.000%
0.000%
17.050%
0.001%
0.000%
0.113%
1.032%
18.380%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
8.155%
0.000%
35.270%
0.000%
0.000%
0.000%
0.000%
0.010%
0.001%
0.000%
0.000%
0.000%
0.000%
0.835%
0.000%
0.012%
0.000%
0.000%
0.000%
2.978%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.148%
0.000%
0.642%
0.000%
3.752%
GW
0.000%
0.000%
0.000%
27.356%
0.000%
0.000%
1.120%
1.819%
21.209%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.627%
0.000%
0.000%
0.000%
0.000%
0.021%
0.004%
0.000%
0.000%
0.000%
0.000%
0.992%
0.000%
0.058%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.354%
0.000%
0.575%
0.000%
6.233%
SW
0.000%
0.000%
0.000%
8.901%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
8.878%
0.000%
43.125%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.601%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.653%
0.000%
2.303%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A49c. Oxamyl (Vydate) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 200 ug/L
Total
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Percent of Systems
with At Least One Detection
> 200 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.375%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.036%
Population Served by Systems
with At Least One Detection
> 200 ug/L
Total
0
0
0
0
200
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
200
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
200
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
200
Percent of Population Served
with At Least One Detection
> 200 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A49d. Oxamyl (Vydate) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 100 ug/L
Total
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Percent of Systems
with At Least One Detection
> 100 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.375%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.036%
Population Served by Systems
with At Least One Detection
> 100 ug/L
Total
0
0
0
0
200
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
200
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
200
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
200
Percent of Population Served
with At Least One Detection
> 100 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A49e. Oxamyl (Vydate) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2 ug/L
Total
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
21
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
17
sw
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
4
Percent of Systems
with At Least One Detection
> 2 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.295%
0.000%
0.066%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.059%
sw
0.000%
0.000%
0.000%
0.000%
0.375%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.690%
0.000%
0.142%
Population Served by Systems
with At Least One Detection
> 2 ug/L
Total
0
0
0
0
200
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3,186
0
299,704
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
41,356
SW
0
0
0
0
200
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3,186
0
258,348
Percent of Population Served
with At Least One Detection
> 2 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.234%
0.000%
0.179%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.067%
sw
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.275%
0.000%
0.244%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A50. Pentachlorophenol — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 1 ug/L
> 0.5 ug/L
> 1 ug/L
> 0.5 ug/L
>lug/L
> 0.5 ug/L
Total # Systems
Reporting
31,142
31,142
3,197
3,197
34,339
34,339
# Systems Exceeding
Threshold of Interest
7
21
1
8
8
29
% Systems Exceeding
Threshold of Interest
0.022%
0.067%
0.031%
0.250%
0.023%
0.084%
Total Pop. Served by
Systems Reporting
68,667,605
68,667,605
121,840,104
121,840,104
190,507,709
190,507,709
Total Pop. Served by
Systems Exceeding
Threshold of Interest
11,376
434,892
429
310,346
11,805
745,238
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.017%
0.633%
0.000%
0.255%
0.006%
0.391%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A50a. Pentachlorophenol — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
113
596
1,588
6,850
14,641
2,526
1,330
826
2,395
1,481
1,733
2,096
4,017
2,286
2,370
2,953
2,515
378
6,583
4,627
5,945
3,280
13,940
398
2,220
4,193
199
4,904
1,635
2,884
599
2,055
881
3,304
952
61
13,213
7,089
441
1,303
3,176
644
1,255
136,475
GW
48
405
1,357
5,427
8,627
1,847
1,013
788
2,327
1,402
1,603
1,814
3,475
2,119
637
2,167
1,699
317
6,290
4,495
4,997
2,970
12,710
338
2,143
3,874
174
4,637
1,188
2,173
404
1,573
619
2,893
842
12
6,622
5,906
148
1,109
3,084
337
941
107,551
SW
65
191
231
1,423
6,014
679
317
38
68
79
130
282
542
167
1,733
786
816
61
293
132
948
310
1,230
60
77
319
25
267
447
711
195
482
262
411
110
49
6,591
1,183
293
194
92
307
314
28,924
Percent of Samples
with Detections
Total
0.000%
0.671%
0.000%
0.409%
0.096%
0.079%
0.000%
0.000%
0.626%
0.068%
0.115%
0.191%
0.100%
0.131%
0.422%
0.034%
3.459%
0.265%
0.091%
0.108%
0.017%
0.122%
0.344%
1.759%
0.045%
0.048%
0.000%
0.224%
0.550%
0.139%
0.334%
0.292%
0.000%
0.454%
0.000%
0.000%
0.015%
0.042%
0.000%
0.230%
0.535%
1.863%
0.398%
0.248%
GW
0.000%
0.494%
0.000%
0.479%
0.104%
0.108%
0.000%
0.000%
0.602%
0.071%
0.125%
0.221%
0.086%
0.142%
0.157%
0.046%
3.002%
0.315%
0.095%
0.089%
0.020%
0.135%
0.330%
0.592%
0.047%
0.052%
0.000%
0.237%
0.673%
0.184%
0.495%
0.318%
0.000%
0.449%
0.000%
0.000%
0.000%
0.051%
0.000%
0.180%
0.551%
2.671%
0.531%
0.243%
SW
0.000%
1.047%
0.000%
0.141%
0.083%
0.000%
0.000%
0.000%
1.471%
0.000%
0.000%
0.000%
0.185%
0.000%
0.519%
0.000%
4.412%
0.000%
0.000%
0.758%
0.000%
0.000%
0.488%
8.333%
0.000%
0.000%
0.000%
0.000%
0.224%
0.000%
0.000%
0.207%
0.000%
0.487%
0.000%
0.000%
0.030%
0.000%
0.000%
0.515%
0.000%
0.977%
0.000%
0.270%
Minimum Detect
Concentration (u.g/L)
Total
0.07
0.04
0.05
0.1
0.01
0.26
0.2
0.06
0.09
0.06
0.01
0.04
0.01
0.3
0.1
0.5
0.01
0.14
0.04
0.04
0.67
0.05
0.01
0.04
0.84
0.13
0.04
0.02
4
0.1
0.04
0.04
0.01
0.1
0.01
GW
0.19
0.04
0.05
0.1
0.01
0.26
0.2
0.06
0.09
0.06
4
0.04
0.01
0.3
0.1
0.5
0.01
0.14
0.04
0.04
0.67
0.05
0.01
0.04
0.84
0.13
0.05
0.02
0.1
0.04
0.04
0.01
0.1
0.01
SW
0.07
0.04
0.18
0.14
0.32
0.01
0.01
0.8
0.07
0.07
0.09
0.04
0.03
4
0.1
0.01
0.01
Median Detect
Concentration (u.g/L)
Total
0.145
0.05
0.325
0.195
0.01
0.26
0.3
0.145
0.135
0.19
0.5
0.04
0.04
0.3
0.175
0.7
0.01
0.445
0.105
0.08
0.67
0.075
0.25
0.06
1
0.435
0.095
0.06
4
0.1
0.1
0.08
0.01
0.19
0.08
GW
0.4
0.05
0.2
0.195
0.01
0.26
0.3
0.145
0.11
0.19
4
0.04
0.03
0.3
0.175
0.65
0.01
0.445
0.095
0.045
0.67
0.075
0.25
0.055
1
0.435
0.1
0.08
0.1
0.07
0.08
0.01
0.19
0.08
SW
0.085
0.325
0.4
0.14
0.32
0.5
0.045
0.8
0.12
0.11
0.09
0.04
0.04
4
0.1
0.01
0.09
90th Percentile Detect
Concentration (u.g/L)
Total
0.61
0.28
0.7
0.29
0.32
0.26
0.4
0.66
0.32
0.19
2.5
0.04
0.14
0.3
0.29
0.8
0.01
1
0.4
0.16
0.67
0.1
0.97
0.15
5
0.74
0.3
0.19
4
0.2
0.1
0.24
0.5
2
0.6
GW
0.61
0.16
10
0.29
0.32
0.26
0.4
0.66
0.16
0.19
4
0.04
0.14
0.3
0.29
0.8
0.01
1
0.4
0.05
0.67
0.1
0.97
0.15
5
0.74
0.3
0.19
0.2
0.1
0.24
0.65
2
0.6
SW
0.1
0.61
0.51
0.14
0.32
1
0.14
0.8
0.13
0.16
0.09
0.04
0.05
4
0.1
0.5
0.51
Maximum Detect
Concentration (u.g/L)
Total
0.61
0.61
10
0.29
0.32
0.26
0.4
0.66
0.32
0.19
4
0.04
0.85
0.3
0.29
0.8
0.01
1
3.6
0.16
0.67
0.1
1.3
0.15
5
0.74
0.3
0.25
4
0.2
0.1
0.3
0.65
2
10
GW
0.61
0.34
10
0.29
0.32
0.26
0.4
0.66
0.16
0.19
4
0.04
0.85
0.3
0.29
0.8
0.01
1
3.6
0.05
0.67
0.1
1.3
0.15
5
0.74
0.3
0.25
0.2
0.1
0.3
0.65
2
10
SW
0.1
0.61
0.51
0.14
0.32
1
0.45
0.8
0.13
0.16
0.09
0.04
0.05
4
0.1
0.5
4
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A50b. Pentachlorophenol — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
21
184
454
913
1,612
813
654
254
1,318
297
1,054
871
1,368
1,402
243
644
863
216
2,919
1,288
1,476
846
2,365
209
739
1,237
131
694
286
1,345
275
1,087
107
785
260
12
2,006
426
173
440
1,406
342
304
34,339
GW
15
131
382
865
1,283
594
617
251
1,296
283
1,021
814
1,264
1,358
93
527
795
190
2,858
1,259
1,399
786
2,228
182
728
1,196
120
659
265
1,115
196
937
98
725
239
6
1,669
389
63
407
1,386
197
256
31,142
SW
6
53
72
48
329
219
37
3
22
14
33
57
104
44
150
117
68
26
61
29
77
60
137
27
11
41
11
35
21
230
79
150
9
60
21
6
337
37
110
33
20
145
48
3,197
Total Population Served by Systems
Reporting
Total
316,496
3,496,123
2,453,348
6,038,526
33,848,671
4,993,297
2,588,507
624,615
16,796,064
997,274
2,542,611
1,064,886
9,183,247
4,866,706
4,612,320
8,506,732
4,906,061
491,237
7,224,193
3,933,642
3,281,938
757,811
6,885,177
559,198
1,454,673
945,754
1,971,594
1,657,042
959,703
4,923,782
6,526,958
2,937,439
903,992
3,448,394
622,152
651,369
21,524,625
2,500,671
2,380,983
432,434
3,883,613
1,367,674
446,177
190,507,709
GW
84,946
619,137
910,322
2,667,935
12,044,555
526,388
261,240
343,215
14,554,059
305,252
1,433,985
808,690
2,982,850
2,546,970
375,460
1,704,350
907,954
116,848
2,044,337
2,684,001
1,700,607
365,142
1,733,551
253,973
678,193
395,955
344,374
1,395,944
269,812
982,092
495,763
572,689
164,014
820,701
262,981
145,112
5,761,125
1,667,485
26,904
181,270
2,191,869
206,326
129,229
68,667,605
SW
231,550
2,876,986
1,543,026
3,370,591
21,804,116
4,466,909
2,327,267
281,400
2,242,005
692,022
1,108,626
256,196
6,200,397
2,319,736
4,236,860
6,802,382
3,998,107
374,389
5,179,856
1,249,641
1,581,331
392,669
5,151,626
305,225
776,480
549,799
1,627,220
261,098
689,891
3,941,690
6,031,195
2,364,750
739,978
2,627,693
359,171
506,257
15,763,500
833,186
2,354,079
251,164
1,691,744
1,161,348
316,948
121,840,104
Percent of Systems
with At Least One Detection
Total
0.000%
2.174%
0.000%
2.081%
0.744%
0.246%
0.000%
0.000%
0.759%
0.337%
0.190%
0.459%
0.292%
0.214%
3.292%
0.155%
8.111%
0.463%
0.137%
0.155%
0.068%
0.118%
1.734%
1.435%
0.135%
0.162%
0.000%
0.720%
1.049%
0.149%
0.727%
0.552%
0.000%
0.764%
0.000%
0.000%
0.050%
0.235%
0.000%
0.682%
0.853%
2.924%
1.316%
0.731%
GW
0.000%
1.527%
0.000%
1.965%
0.546%
0.337%
0.000%
0.000%
0.694%
0.353%
0.196%
0.491%
0.237%
0.221%
1.075%
0.190%
6.038%
0.526%
0.140%
0.079%
0.071%
0.127%
1.661%
1.099%
0.137%
0.167%
0.000%
0.759%
0.755%
0.179%
1.020%
0.534%
0.000%
0.690%
0.000%
0.000%
0.000%
0.257%
0.000%
0.491%
0.866%
4.569%
1.563%
0.639%
SW
0.000%
3.774%
0.000%
4.167%
1.520%
0.000%
0.000%
0.000%
4.545%
0.000%
0.000%
0.000%
0.962%
0.000%
4.667%
0.000%
32.353%
0.000%
0.000%
3.448%
0.000%
0.000%
2.920%
3.704%
0.000%
0.000%
0.000%
0.000%
4.762%
0.000%
0.000%
0.667%
0.000%
1.667%
0.000%
0.000%
0.297%
0.000%
0.000%
3.030%
0.000%
0.690%
0.000%
1.627%
Percent of Population Served
with At Least One Detection
Total
0.000%
1.177%
0.000%
7.673%
0.622%
0.009%
0.000%
0.000%
18.816%
0.045%
0.041%
0.142%
0.102%
0.016%
7.692%
0.188%
80.605%
0.073%
0.950%
0.127%
0.092%
0.037%
3.965%
2.866%
1.765%
2.156%
0.000%
32.761%
34.877%
0.040%
0.030%
0.725%
0.000%
1.484%
0.000%
0.000%
0.002%
2.679%
0.000%
3.739%
0.649%
0.991%
0.170%
5.094%
GW
0.000%
2.084%
0.000%
5.214%
0.838%
0.084%
0.000%
0.000%
17.898%
0.146%
0.072%
0.187%
0.081%
0.030%
0.506%
0.938%
31.999%
0.308%
3.358%
0.001%
0.178%
0.077%
8.347%
0.085%
3.786%
5.151%
0.000%
38.888%
0.130%
0.202%
0.391%
3.575%
0.000%
1.292%
0.000%
0.000%
0.000%
4.018%
0.000%
0.280%
1.150%
4.448%
0.587%
5.996%
SW
0.000%
0.982%
0.000%
9.619%
0.502%
0.000%
0.000%
0.000%
24.778%
0.000%
0.000%
0.000%
0.112%
0.000%
8.329%
0.000%
91.643%
0.000%
0.000%
0.397%
0.000%
0.000%
2.491%
5.180%
0.000%
0.000%
0.000%
0.000%
48.467%
0.000%
0.000%
0.035%
0.000%
1.543%
0.000%
0.000%
0.003%
0.000%
0.000%
6.236%
0.000%
0.377%
0.000%
4.585%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A50c. Pentachlorophenol — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>lug/L
Total
0
0
0
0
1
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
2
0
0
0
0
1
0
1
0
0
0
0
0
0
1
0
0
0
0
0
1
8
GW
0
0
0
0
1
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
2
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
7
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
Percent of Systems
with At Least One Detection
> 1 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.062%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.412%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.085%
0.000%
0.000%
0.000%
0.000%
0.144%
0.000%
0.074%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.050%
0.000%
0.000%
0.000%
0.000%
0.000%
0.329%
0.023%
GW
0.000%
0.000%
0.000%
0.000%
0.078%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.075%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.090%
0.000%
0.000%
0.000%
0.000%
0.152%
0.000%
0.090%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.391%
0.022%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.297%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.031%
Population Served by Systems
with At Least One Detection
>lug/L
Total
0
0
0
0
50
0
0
0
0
0
0
0
0
0
1,898
0
0
0
0
0
0
0
924
0
0
0
0
8,114
0
300
0
0
0
0
0
0
429
0
0
0
0
0
90
11,805
GW
0
0
0
0
50
0
0
0
0
0
0
0
0
0
1,898
0
0
0
0
0
0
0
924
0
0
0
0
8,114
0
300
0
0
0
0
0
0
0
0
0
0
0
0
90
11,376
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
429
0
0
0
0
0
0
429
Percent of Population Served
with At Least One Detection
>lug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.041%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.013%
0.000%
0.000%
0.000%
0.000%
0.490%
0.000%
0.006%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.020%
0.006%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.506%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.053%
0.000%
0.000%
0.000%
0.000%
0.581%
0.000%
0.031%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.070%
0.017%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.0004%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A50d. Pentachlorophenol — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.5 ug/L
Total
0
1
0
1
4
0
0
0
0
0
0
1
0
0
4
0
1
0
0
2
0
1
2
0
1
0
0
3
0
2
1
0
0
0
0
0
1
0
0
0
0
2
2
29
GW
0
1
0
0
3
0
0
0
0
0
0
1
0
0
1
0
1
0
0
1
0
1
2
0
1
0
0
3
0
2
1
0
0
0
0
0
0
0
0
0
0
1
2
21
SW
0
0
0
1
1
0
0
0
0
0
0
0
0
0
3
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
1
0
8
Percent of Systems
with At Least One Detection
> 0.5 ug/L
Total
0.000%
0.543%
0.000%
0.110%
0.248%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.115%
0.000%
0.000%
1.646%
0.000%
0.116%
0.000%
0.000%
0.155%
0.000%
0.118%
0.085%
0.000%
0.135%
0.000%
0.000%
0.432%
0.000%
0.149%
0.364%
0.000%
0.000%
0.000%
0.000%
0.000%
0.050%
0.000%
0.000%
0.000%
0.000%
0.585%
0.658%
0.084%
GW
0.000%
0.763%
0.000%
0.000%
0.234%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.123%
0.000%
0.000%
1.075%
0.000%
0.126%
0.000%
0.000%
0.079%
0.000%
0.127%
0.090%
0.000%
0.137%
0.000%
0.000%
0.455%
0.000%
0.179%
0.510%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.508%
0.781%
0.067%
SW
0.000%
0.000%
0.000%
2.083%
0.304%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.000%
0.000%
0.000%
0.000%
0.000%
3.448%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.297%
0.000%
0.000%
0.000%
0.000%
0.690%
0.000%
0.250%
Population Served by Systems
with At Least One Detection
> 0.5 ug/L
Total
0
7,857
0
24,219
58,165
0
0
0
0
0
0
800
0
0
266,262
0
249,760
0
0
4,995
0
280
924
0
25,676
0
0
89,527
0
1,985
1,900
0
0
0
0
0
429
0
0
0
0
11,894
565
745,238
GW
0
7,857
0
0
46,165
0
0
0
0
0
0
800
0
0
1,898
0
249,760
0
0
35
0
280
924
0
25,676
0
0
89,527
0
1,985
1,900
0
0
0
0
0
0
0
0
0
0
7,520
565
434,892
SW
0
0
0
24,219
12,000
0
0
0
0
0
0
0
0
0
264,364
0
0
0
0
4,960
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
429
0
0
0
0
4,374
0
310,346
Percent of Population Served
with At Least One Detection
> 0.5 ug/L
Total
0.000%
0.225%
0.000%
0.401%
0.172%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.075%
0.000%
0.000%
5.773%
0.000%
5.091%
0.000%
0.000%
0.127%
0.000%
0.037%
0.013%
0.000%
1.765%
0.000%
0.000%
5.403%
0.000%
0.040%
0.029%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
0.000%
0.000%
0.000%
0.000%
0.870%
0.127%
0.391%
GW
0.000%
1.269%
0.000%
0.000%
0.383%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.099%
0.000%
0.000%
0.506%
0.000%
27.508%
0.000%
0.000%
0.001%
0.000%
0.077%
0.053%
0.000%
3.786%
0.000%
0.000%
6.413%
0.000%
0.202%
0.383%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.645%
0.437%
0.633%
SW
0.000%
0.000%
0.000%
0.719%
0.055%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.240%
0.000%
0.000%
0.000%
0.000%
0.397%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.000%
0.000%
0.377%
0.000%
0.255%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A51. Picloram — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 500 ug/L
> 250 ug/L
> 500 ug/L
> 250 ug/L
> 500 ug/L
> 250 ug/L
Total # Systems
Reporting
29,914
29,914
2,996
2,996
32,910
32,910
# Systems Exceeding
Threshold of Interest
0
0
0
0
0
0
% Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Total Pop. Served by
Systems Reporting
66,798,378
66,798,378
119,588,052
119,588,052
186,386,430
186,386,430
Total Pop. Served by
Systems Exceeding
Threshold of Interest
0
0
0
0
0
0
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A51a. Picloram — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
73
550
1,588
6,831
14,022
2,528
1,325
826
2,388
1,431
1,737
2,057
3,241
2,258
1,746
2,967
2,488
378
6,395
4,627
5,803
3,187
13,934
411
2,220
4,193
162
4,347
1,569
2,877
587
2,067
740
3,303
965
58
2,174
7,079
441
1,298
3,161
646
1,242
121,920
GW
39
404
1,357
5,406
8,210
1,852
1,010
788
2,321
1,353
1,607
1,777
2,688
2,093
443
2,176
1,699
317
6,103
4,495
4,984
2,905
12,704
348
2,143
3,874
144
4,100
1,161
2,165
392
1,583
498
2,893
856
12
1,343
5,897
148
1,104
3,069
338
935
99,734
SW
34
146
231
1,425
5,812
676
315
38
67
78
130
280
553
165
1,303
791
789
61
292
132
819
282
1,230
63
77
319
18
247
408
712
195
484
242
410
109
46
831
1,182
293
194
92
308
307
22,186
Percent of Samples
with Detections
Total
0.000%
0.364%
0.000%
0.117%
0.071%
0.514%
0.000%
0.121%
0.461%
0.000%
0.345%
0.000%
0.000%
0.221%
0.515%
0.135%
1.166%
0.000%
0.047%
0.000%
0.000%
0.157%
0.201%
4.136%
0.180%
0.024%
0.000%
0.023%
0.064%
0.070%
0.170%
0.145%
0.270%
0.303%
0.311%
0.000%
0.000%
0.000%
0.000%
0.154%
0.158%
1.858%
0.081%
0.163%
GW
0.000%
0.248%
0.000%
0.111%
0.061%
0.648%
0.000%
0.127%
0.474%
0.000%
0.373%
0.000%
0.000%
0.191%
0.226%
0.184%
0.942%
0.000%
0.049%
0.000%
0.000%
0.172%
0.197%
4.598%
0.187%
0.026%
0.000%
0.024%
0.086%
0.092%
0.000%
0.190%
0.201%
0.346%
0.350%
0.000%
0.000%
0.000%
0.000%
0.181%
0.163%
2.663%
0.107%
0.159%
SW
0.000%
0.685%
0.000%
0.140%
0.086%
0.148%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.606%
0.614%
0.000%
1.648%
0.000%
0.000%
0.000%
0.000%
0.000%
0.244%
1.587%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.513%
0.000%
0.413%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.974%
0.000%
0.180%
Minimum Detect
Concentration (u.g/L)
Total
80.4
0.1
0.01
0.5
0.19
0.01
1.6
0.1
0.05
0.1
0.05
2
0.14
0.1
0.1
1.6
2
1.4
0.11
1
0.2
0.2
0.1
0.05
1.96
0.04
0.1
0.02
1.5
0.01
GW
111.9
0.1
0.1
0.5
0.19
0.01
1.6
0.1
190
0.1
0.1
2
0.14
0.1
0.1
1.6
2
1.4
0.11
1
0.2
0.1
0.05
1.96
0.04
0.1
0.02
1.5
0.01
SW
80.4
0.1
0.01
0.73
0.4
0.05
0.05
0.2
0.11
0.2
0.11
0.02
0.01
Median Detect
Concentration (u.g/L)
Total
96.15
0.1
0.65
0.73
0.19
0.01
5.8
0.2
0.5
0.685
0.2
2
1.4
0.205
0.3
3.2
2
1.4
0.11
1.05
0.2
0.5
0.105
0.195
2.04
0.395
0.1
0.025
1.5
0.24
GW
111.9
0.1
2.1
0.73
0.19
0.01
5.8
0.2
190
0.685
0.19
2
1.4
0.19
0.31
3.2
2
1.4
0.11
1.05
0.5
0.1
0.195
2.04
0.395
0.1
0.03
1.5
0.25
SW
80.4
0.1
0.2
0.73
0.4
0.3
0.2
0.26
0.11
0.2
0.11
0.02
0.2
90th Percentile Detect
Concentration (u.g/L)
Total
111.9
0.1
12.5
1.4
0.19
0.09
11
3.4
190
1.2
3.01
2
2
0.65
2.3
3.4
2
1.4
0.11
1.1
0.2
0.5
0.11
0.92
3.42
0.75
1.1
0.1
1.5
3
GW
111.9
0.1
13
1.4
0.19
0.09
11
3.4
190
1.2
2.48
2
2
0.65
2.3
3.4
2
1.4
0.11
1.1
0.5
0.1
0.92
3.42
0.75
1.1
0.1
1.5
2.48
SW
80.4
0.1
3
0.73
0.4
100
3.46
0.28
0.11
0.2
0.11
0.5
3.235
Maximum Detect
Concentration (u.g/L)
Total
111.9
0.1
13
1.6
0.19
0.1
11
3.4
190
1.2
3.76
2
2
1.9
2.47
3.4
2
1.4
0.11
1.1
0.2
0.5
0.11
1.3
3.42
0.75
1.1
0.5
1.5
190
GW
111.9
0.1
13
1.6
0.19
0.1
11
3.4
190
1.2
2.67
2
2
1.9
2.47
3.4
2
1.4
0.11
1.1
0.5
0.1
1.3
3.42
0.75
1.1
0.1
1.5
190
SW
80.4
0.1
3
0.73
0.4
100
3.76
0.28
0.11
0.2
0.11
0.5
100
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A51b. Picloram — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
19
176
454
918
1,582
813
656
254
1,318
297
1,055
870
1,157
1,403
242
645
863
216
2,908
1,288
1,475
846
2,365
209
739
1,237
127
692
287
1,346
273
1,089
89
785
260
10
856
426
173
440
1,406
342
304
32,910
GW
14
128
382
870
1,261
594
619
251
1,296
283
1,022
813
1,056
1,359
92
528
795
190
2,847
1,259
1,398
786
2,228
182
728
1,196
116
657
266
1,116
194
939
80
725
239
5
702
389
63
407
1,386
197
256
29,914
SW
5
48
72
48
321
219
37
3
22
14
33
57
101
44
150
117
68
26
61
29
77
60
137
27
11
41
11
35
21
230
79
150
9
60
21
5
154
37
110
33
20
145
48
2,996
Total Population Served by Systems
Reporting
Total
316,371
2,771,799
2,453,348
6,045,047
33,364,134
4,993,297
2,589,596
624,615
16,796,064
997,274
2,542,641
1,064,826
9,106,231
4,870,706
4,606,159
8,509,903
4,906,061
491,237
7,222,532
3,933,642
3,281,888
757,811
6,885,177
559,198
1,454,673
945,754
1,969,193
1,656,892
960,268
4,923,979
6,517,900
2,939,339
900,695
3,448,394
622,152
645,820
18,700,247
2,500,671
2,380,983
432,449
3,883,613
1,367,674
446,177
186,386,430
GW
84,921
604,527
910,322
2,674,456
12,015,440
526,388
262,329
343,215
14,554,059
305,252
1,434,015
808,630
2,910,309
2,550,970
369,299
1,707,521
907,954
116,848
2,042,676
2,684,001
1,700,557
365,142
1,733,551
253,973
678,193
395,955
341,973
1,395,794
270,377
982,289
486,705
574,589
160,717
820,701
262,981
144,963
4,013,688
1,667,485
26,904
181,285
2,191,869
206,326
129,229
66,798,378
SW
231,450
2,167,272
1,543,026
3,370,591
21,348,694
4,466,909
2,327,267
281,400
2,242,005
692,022
1,108,626
256,196
6,195,922
2,319,736
4,236,860
6,802,382
3,998,107
374,389
5,179,856
1,249,641
1,581,331
392,669
5,151,626
305,225
776,480
549,799
1,627,220
261,098
689,891
3,941,690
6,031,195
2,364,750
739,978
2,627,693
359,171
500,857
14,686,559
833,186
2,354,079
251,164
1,691,744
1,161,348
316,948
119,588,052
Percent of Systems
with At Least One Detection
Total
0.000%
1.136%
0.000%
0.436%
0.379%
0.861%
0.000%
0.394%
0.379%
0.000%
0.095%
0.000%
0.000%
0.356%
2.893%
0.620%
2.897%
0.000%
0.069%
0.000%
0.000%
0.355%
0.803%
2.871%
0.541%
0.081%
0.000%
0.145%
0.348%
0.074%
0.366%
0.184%
2.247%
0.764%
1.154%
0.000%
0.000%
0.000%
0.000%
0.455%
0.284%
2.924%
0.329%
0.413%
GW
0.000%
0.781%
0.000%
0.345%
0.238%
1.010%
0.000%
0.398%
0.386%
0.000%
0.098%
0.000%
0.000%
0.294%
1.087%
0.758%
1.761%
0.000%
0.070%
0.000%
0.000%
0.382%
0.718%
2.747%
0.549%
0.084%
0.000%
0.152%
0.376%
0.090%
0.000%
0.213%
1.250%
0.828%
1.255%
0.000%
0.000%
0.000%
0.000%
0.491%
0.289%
4.569%
0.391%
0.351%
SW
0.000%
2.083%
0.000%
2.083%
0.935%
0.457%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.273%
4.000%
0.000%
16.176%
0.000%
0.000%
0.000%
0.000%
0.000%
2.190%
3.704%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.266%
0.000%
11.111%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.690%
0.000%
1.035%
Percent of Population Served
with At Least One Detection
Total
0.000%
0.252%
0.000%
7.129%
0.434%
0.159%
0.000%
0.005%
15.504%
0.000%
0.017%
0.000%
0.000%
5.417%
7.899%
0.516%
74.535%
0.000%
0.015%
0.000%
0.000%
0.286%
12.034%
1.964%
0.495%
0.008%
0.000%
0.490%
0.052%
0.034%
0.874%
0.171%
3.131%
0.111%
2.386%
0.000%
0.000%
0.000%
0.000%
0.117%
0.680%
0.465%
0.157%
4.575%
GW
0.000%
0.289%
0.000%
4.897%
0.191%
0.939%
0.000%
0.009%
17.893%
0.000%
0.031%
0.000%
0.000%
0.013%
0.291%
2.572%
2.953%
0.000%
0.054%
0.000%
0.000%
0.594%
4.419%
2.829%
1.061%
0.020%
0.000%
0.581%
0.185%
0.172%
0.000%
0.875%
0.964%
0.468%
5.645%
0.000%
0.000%
0.000%
0.000%
0.280%
1.204%
0.961%
0.542%
4.486%
SW
0.000%
0.242%
0.000%
8.901%
0.570%
0.067%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
11.360%
8.562%
0.000%
90.791%
0.000%
0.000%
0.000%
0.000%
0.000%
14.597%
1.245%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.944%
0.000%
3.601%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.377%
0.000%
4.624%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A51c. Picloram — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 500 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 500 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 500 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 500 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A51d. Picloram — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 250 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 250 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 250 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 250 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A52. Polychlorinated biphenyls (PCBs) -Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 0.5 ug/L
> 0.25 ug/L
> 0.5 ug/L
> 0.25 ug/L
> 0.5 ug/L
> 0.25 ug/L
Total # Systems
Reporting
16,249
16,249
2,144
2,144
18,393
18,393
# Systems Exceeding
Threshold of Interest
2
4
0
3
2
7
% Systems Exceeding
Threshold of Interest
0.012%
0.025%
0.000%
0.140%
0.011%
0.038%
Total Pop. Served by
Systems Reporting
45,009,798
45,009,798
79,104,410
79,104,410
124,114,208
124,114,208
Total Pop. Served by
Systems Exceeding
Threshold of Interest
125,046
128,040
0
593,206
125,046
721,246
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.278%
0.284%
0.000%
0.750%
0.101%
0.581%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A52a. Polychlorinated biphenyls (PCBs) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
70
537
1,641
1,326
10,122
2,524
1,275
31
2,377
1,423
9
1,307
4,447
960
1,686
206
163
1,767
13,170
49
859
945
2,854
432
2,047
953
61
770
7,092
479
1,015
2,830
527
1,262
67,216
GW
50
386
1,395
1,100
5,952
1,819
956
31
2,312
1,344
8
1,081
3,726
818
426
43
142
1,603
12,078
27
805
750
2,107
327
1,566
844
11
753
5,914
173
875
2,737
262
944
53,365
SW
20
151
246
226
4,170
705
319
0
65
79
1
226
721
142
1,260
163
21
164
1,092
22
54
195
747
105
481
109
50
17
1,178
306
140
93
265
318
13,851
Percent of Samples
with Detections
Total
0.000%
0.745%
0.000%
0.603%
0.010%
0.000%
0.000%
0.000%
0.421%
0.000%
0.000%
0.000%
0.000%
0.000%
0.237%
0.971%
0.000%
0.000%
0.008%
0.000%
0.000%
0.106%
0.000%
1.620%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.099%
0.000%
2.087%
0.000%
0.074%
GW
0.000%
0.259%
0.000%
0.727%
0.017%
0.000%
0.000%
0.000%
0.433%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.326%
0.000%
0.000%
0.008%
0.000%
0.000%
0.000%
0.000%
2.141%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.114%
0.000%
3.053%
0.000%
0.071%
SW
0.000%
1.987%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.317%
0.613%
0.000%
0.000%
0.000%
0.000%
0.000%
0.513%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.132%
0.000%
0.087%
Minimum Detect
Concentration (u.g/L)
Total
0.12
0.1
0.52
0.1
0.05
0.12
0.31
0.5
0.1
0.2
0.1
0.05
GW
0.33
0.1
0.52
0.1
0.21
0.31
0.1
0.2
0.1
0.1
SW
0.12
0.05
0.12
0.5
0.1
0.05
Median Detect
Concentration (u.g/L)
Total
0.17
0.17
0.52
0.1
0.5
0.165
0.31
0.5
0.6
0.2
0.1
0.1
GW
0.33
0.17
0.52
0.1
0.21
0.31
0.6
0.2
0.1
0.1
SW
0.16
0.5
0.12
0.5
0.1
0.17
90th Percentile Detect
Concentration (u.g/L)
Total
0.33
0.24
0.52
0.1
0.5
0.21
0.31
0.5
1.44
0.2
0.1
0.54
GW
0.33
0.24
0.52
0.1
0.21
0.31
1.44
0.2
0.1
0.6
SW
0.18
0.5
0.12
0.5
0.5
0.5
Maximum Detect
Concentration (u.g/L)
Total
0.33
0.24
0.52
0.1
0.5
0.21
0.31
0.5
1.44
0.2
0.5
1.44
GW
0.33
0.24
0.52
0.1
0.21
0.31
1.44
0.2
0.1
1.44
SW
0.18
0.5
0.12
0.5
0.5
0.5
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A52b. Polychlorinated biphenyls (PCBs) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
14
174
437
366
1,332
810
643
24
1,310
291
2
544
1,358
581
242
55
130
705
2,365
13
271
249
1,246
245
1,083
261
11
617
427
178
410
1,384
311
304
18,393
GW
9
128
366
337
1,079
591
605
24
1,289
277
1
515
1,254
537
93
28
118
650
2,228
7
258
229
1,030
176
933
240
5
609
390
70
379
1,364
174
256
16,249
SW
5
46
71
29
253
219
38
0
21
14
1
29
104
44
149
27
12
55
137
6
13
20
216
69
150
21
6
8
37
108
31
20
137
48
2,144
Total Population Served by Systems
Reporting
Total
23,947
2,733,250
2,445,874
4,849,157
29,239,114
4,991,979
2,589,577
94,720
16,785,272
967,784
162,118
875,826
9,182,612
3,757,238
4,602,489
3,859,880
284,816
726,404
6,885,177
25,452
1,365,772
946,071
4,789,355
6,367,123
2,936,604
622,272
648,070
508,429
2,500,736
2,303,114
426,022
3,841,377
1,330,400
446,177
124,114,208
GW
14,048
611,586
904,110
1,888,824
9,516,308
525,070
255,690
94,720
14,546,096
275,762
27,501
656,625
2,982,215
1,437,502
375,460
86,871
85,281
336,830
1,733,551
18,423
1,209,925
256,272
933,413
462,749
571,854
263,101
127,613
469,714
1,667,550
29,317
181,998
2,149,633
184,957
129,229
45,009,798
SW
9,899
2,121,664
1,541,764
2,960,333
19,722,806
4,466,909
2,333,887
0
2,239,176
692,022
134,617
219,201
6,200,397
2,319,736
4,227,029
3,773,009
199,535
389,574
5,151,626
7,029
155,847
689,799
3,855,942
5,904,374
2,364,750
359,171
520,457
38,715
833,186
2,273,797
244,024
1,691,744
1,145,443
316,948
79,104,410
Percent of Systems
with At Least One Detection
Total
0.000%
1.724%
0.000%
0.546%
0.075%
0.000%
0.000%
0.000%
0.382%
0.000%
0.000%
0.000%
0.000%
0.000%
0.826%
3.636%
0.000%
0.000%
0.042%
0.000%
0.000%
0.402%
0.000%
0.816%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.244%
0.000%
2.894%
0.000%
0.158%
GW
0.000%
0.781%
0.000%
0.593%
0.093%
0.000%
0.000%
0.000%
0.388%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.571%
0.000%
0.000%
0.045%
0.000%
0.000%
0.000%
0.000%
1.136%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.264%
0.000%
4.598%
0.000%
0.135%
SW
0.000%
4.348%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.342%
3.704%
0.000%
0.000%
0.000%
0.000%
0.000%
5.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.730%
0.000%
0.326%
Percent of Population Served
with At Least One Detection
Total
0.000%
9.200%
0.000%
0.961%
0.428%
0.000%
0.000%
0.000%
15.514%
0.000%
0.000%
0.000%
0.000%
0.000%
6.721%
0.029%
0.000%
0.000%
0.001%
0.000%
0.000%
35.343%
0.000%
0.007%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.453%
0.000%
2.964%
GW
0.000%
0.480%
0.000%
2.466%
1.314%
0.000%
0.000%
0.000%
17.903%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.035%
0.000%
0.000%
0.003%
0.000%
0.000%
0.000%
0.000%
0.097%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.169%
0.000%
0.896%
0.000%
6.179%
SW
0.000%
11.714%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
7.318%
0.029%
0.000%
0.000%
0.000%
0.000%
0.000%
48.474%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.382%
0.000%
1.135%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A52c. Polychlorinated biphenyls (PCBs) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.5 ug/L
Total
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
2
GW
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
2
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 0.5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.075%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.408%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.011%
GW
0.000%
0.000%
0.000%
0.000%
0.093%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.568%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.012%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 0.5 ug/L
Total
0
0
0
0
125,000
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
46
0
0
0
0
0
0
0
0
0
0
125,046
GW
0
0
0
0
125,000
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
46
0
0
0
0
0
0
0
0
0
0
125,046
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 0.5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.428%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.101%
GW
0.000%
0.000%
0.000%
0.000%
1.314%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.010%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.278%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A52d. Polychlorinated biphenyls (PCBs) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.25 ug/L
Total
0
1
0
0
1
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
1
0
1
0
0
0
0
0
0
0
0
1
0
7
GW
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
4
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1
0
3
Percent of Systems
with At Least One Detection
> 0.25 ug/L
Total
0.000%
0.575%
0.000%
0.000%
0.075%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.413%
0.000%
0.000%
0.000%
0.042%
0.000%
0.000%
0.402%
0.000%
0.408%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.322%
0.000%
0.038%
GW
0.000%
0.781%
0.000%
0.000%
0.093%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.045%
0.000%
0.000%
0.000%
0.000%
0.568%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.025%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.730%
0.000%
0.140%
Population Served by Systems
with At Least One Detection
> 0.25 ug/L
Total
0
2,937
0
0
125,000
0
0
0
0
0
0
0
0
0
254,462
0
0
0
57
0
0
334,370
0
46
0
0
0
0
0
0
0
0
4,374
0
721,246
GW
0
2,937
0
0
125,000
0
0
0
0
0
0
0
0
0
0
0
0
0
57
0
0
0
0
46
0
0
0
0
0
0
0
0
0
0
128,040
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
254,462
0
0
0
0
0
0
334,370
0
0
0
0
0
0
0
0
0
0
4,374
0
593,206
Percent of Population Served
with At Least One Detection
> 0.25 ug/L
Total
0.000%
0.107%
0.000%
0.000%
0.428%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.529%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
35.343%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.329%
0.000%
0.581%
GW
0.000%
0.480%
0.000%
0.000%
1.314%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.000%
0.000%
0.010%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.284%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.020%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
48.474%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.382%
0.000%
0.750%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A53 (Original Rule). Radium-226 228 — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 5 pCi/L
> 2.5 pCi/L
> 5 pCi/L
> 2.5 pCi/L
> 5 pCi/L
> 2.5 pCi/L
Total # Systems
Reporting
6,190
6,190
694
694
6,884
6,884
# Systems
Exceeding
Threshold of
Interest
488
1,185
14
37
502
1,222
% Systems
Exceed ing
Threshold of
Interest
7.884%
19.144%
2.017%
5.331%
7.292%
17.751%
Total Pop. Served
by Systems
Reporting
15,006,355
15,006,355
32,416,085
32,416,085
47,422,440
47,422,440
Total Pop. Served by
Systems Exceeding
Threshold of Interest
2,143,386
4,652,946
2,418,615
4,510,400
4,562,001
9,163,346
% Pop. Served by
Systems Exceeding
Threshold of
Interest
14.283%
31.007%
7.461%
13.914%
9.620%
19.323%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A53a (Original Rule). Radium-226 228 — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
5
29
1,721
1,838
366
247
4
1,539
897
3,187
3
3
674
98
24
912
383
181
521
58
62
99
263
31
954
184
1,059
5
1,192
115
10
429
1,026
250
83
18,452
GW
5
25
1,092
1,149
342
216
0
1,492
804
3,147
3
1
606
91
24
819
343
164
511
45
62
76
198
26
753
167
992
4
1,144
35
9
391
982
134
68
15,920
SW
0
4
629
689
24
31
4
47
93
40
0
2
68
7
0
93
40
17
10
13
0
23
65
5
201
17
67
1
48
80
1
38
44
116
15
2,532
Percent of Samples
with Detections
Total
60.000%
82.759%
27.077%
55.658%
85.519%
75.709%
100.000%
68.421%
32.776%
98.463%
100.000%
100.000%
32.938%
94.898%
95.833%
30.044%
65.274%
32.044%
76.200%
79.310%
51.613%
47.475%
84.411%
38.710%
20.440%
83.152%
39.377%
40.000%
86.242%
50.435%
100.000%
80.420%
99.708%
92.800%
68.675%
63.446%
GW
60.000%
92.000%
31.410%
59.443%
86.550%
78.704%
69.839%
33.582%
98.538%
100.000%
100.000%
34.158%
94.505%
95.833%
31.258%
72.303%
33.537%
76.321%
100.000%
51.613%
50.000%
88.384%
42.308%
17.397%
85.030%
40.423%
50.000%
86.976%
71.429%
100.000%
81.074%
99.695%
95.522%
72.059%
67.079%
SW
25.000%
19.555%
49.347%
70.833%
54.839%
100.000%
23.404%
25.806%
92.500%
100.000%
22.059%
100.000%
19.355%
5.000%
17.647%
70.000%
7.692%
39.130%
72.308%
20.000%
31.841%
64.706%
23.881%
0.000%
68.750%
41.250%
100.000%
73.684%
100.000%
89.655%
53.333%
40.600%
Minimum Detect
Concentration (pCi/L)
Total
0.08
0.1
0.2
0.03
0.03
0.01
5.7
0.2
0.1
0.1
4.1
0.2
0.2
0.05
0.3
0.2
0.06
0.3
0.1
0.08
2.28
0.2
0.0495
1.01
0.0293
0.06
1
1.3
0.2
1
0.1
0.04
0.02
0.1
0.1
0.01
GW
0.08
0.6
0.2
0.03
0.03
0.01
0.2
0.1
0.1
4.1
0.2
0.2
0.05
0.3
0.2
0.06
0.3
0.1
0.08
2.28
0.2
0.079
1.01
0.2
0.06
1
1.3
0.2
1
0.873
0.04
0.03
0.1
0.1
0.01
SW
0.1
0.2
0.07
0.2
0.2
5.7
0.6
0.1
0.2
0.3
0.26
0.2
0.2
0.17
1.09
0.5
2.98
0.2
0.0495
1.38
0.0293
0.23
1
0.2
1
0.1
0.06
0.02
0.1
0.2
0.02
Median Detect
Concentration (pCi/L)
Total
0.09
2.33
0.5
0.85
6.1
1.6
5.7
2.3
0.4
4.8
5.6
0.3
2.2
0.56
4.2
0.8
3.3
1.55
1
3.395
4.675
0.688
1.78
1.845
1.4
1.13
2.7
1.55
0.9
2
5.195
0.45
3.6
0.5
2.8
1.9
GW
0.09
2.37
0.5
0.89
6.6
1.765
2.3
0.4
4.9
5.6
0.2
2.3
0.525
4.2
0.75
3.3
1.56
1
3.59
4.675
0.939
2.4
2
1.43
1.13
2.7
1.55
0.99
3
5.64
0.54
3.54
0.6
3.4
2.1
SW
0.1
0.5
0.785
1
1.1
5.7
1
0.45
1
1.25
1.253
2.42
1.8
0.735
1.17
0.9
2.98
0.22
0.8
1.38
1.335
0.51
1.3
0.3
2
0.1
0.2
5.3
0.3
0.65
0.785
90th Percentile Detect
Concentration (pCi/L)
Total
0.13
5.6
3.5
1.77
19.2
14.3
5.7
6.7
3.2
12.9
6.2
2.2
5.5
3.48
9.2
4.5
10.8
2.79
3
5.35
8.76
3.416
7.6
6.35
2.45
3.35
9
1.8
3.8
7
8.625
3.7
7.9
2.5
6.7
9
GW
0.13
5.6
4.5
1.97
19.9
14.425
6.7
3.2
13
6.2
0.2
5.7
3.44
9.2
4.4
10.9
2.79
3
5.35
8.76
3.416
8.1
6.35
2.87
3.38
9
1.8
3.8
9
9.62
4.15
7.8
4.5
6.7
9.3
SW
0.1
1.8
1.4
1.7
2.4
5.7
2.2
3.76
1.9
2.2
2.42
7.93
6
1.3
1.4
3.1
2.98
4.06
3.7
1.38
2.2
1.39
4.3
1.1
2
0.1
0.98
9
0.9
9.8
2.4
Maximum Detect
Concentration (pCi/L)
Total
0.13
17.9
12.8
142
47
39.92
5.7
19.2
19
28.2
6.2
2.2
14.3
8.06
16.1
11
45.9
6.26
7.6
8.26
10.57
6.93
28.7
8.23
4.9
13.42
25
1.8
22.6
10
9.62
19.43
26.7
7.9
9.8
142
GW
0.13
17.9
12.8
21.71
47
39.92
19.2
19
28.2
6.2
0.2
14.3
8.06
16.1
11
45.9
6.26
7.6
8.26
10.57
6.93
28.7
8.23
4.9
13.42
25
1.8
22.6
10
9.62
19.43
26.7
7.9
8.2
47
SW
0.1
5.45
142
3.2
2.76
5.7
3.4
4.7
2.6
2.2
5.083
7.93
6.1
1.3
1.4
3.1
2.98
4.06
9.41
1.38
3
1.76
5.1
8.3
2
0.1
1.7
10.4
2.6
9.8
142
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A53b (Original Rule). Radium-226 228 — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
5
11
269
212
124
107
1
872
421
349
2
2
314
59
22
551
159
173
223
27
20
34
116
19
613
53
379
4
875
15
4
312
294
208
35
6,884
GW
5
10
258
156
107
96
0
839
399
329
2
1
283
56
22
496
130
156
216
25
20
29
84
17
486
48
353
3
841
14
3
282
291
105
28
6,190
SW
0
1
11
56
17
11
1
33
22
20
0
1
31
3
0
55
29
17
7
2
0
5
32
2
127
5
26
1
34
1
1
30
3
103
7
694
Total Population Served by Systems
Reporting
Total
14,544
775,613
4,744,269
10,706,892
439,620
1,067,986
715,820
2,478,368
851,551
1,942,114
928
151,039
2,768,089
45,990
31,449
690,718
1,589,233
545,827
813,616
675,668
13,812
645,637
2,207,311
358,320
2,577,462
758,560
1,732,025
2,200
3,938,407
452,327
1,208
260,741
2,285,860
1,012,959
126,277
47,422,440
GW
14,544
114,179
1,581,000
1,812,964
128,156
65,967
0
1,369,742
636,614
1,325,106
928
84,935
757,553
43,281
31,449
299,264
220,164
248,887
274,704
320,792
13,812
56,442
169,118
142,727
419,886
141,563
499,578
500
2,409,649
300,067
198
148,444
1,216,339
110,743
47,060
15,006,355
SW
0
661,434
3,163,269
8,893,928
311,464
1,002,019
715,820
1,108,626
214,937
617,008
0
66,104
2,010,536
2,709
0
391,454
1,369,069
296,940
538,912
354,876
0
589,195
2,038,193
215,593
2,157,576
616,997
1,232,447
1,700
1,528,758
152,260
1,010
112,297
1,069,521
902,216
79,217
32,416,085
Percent of Systems
with At Least One Detection
Total
60.000%
90.909%
45.725%
60.849%
75.000%
77.570%
100.000%
63.647%
42.755%
98.281%
100.000%
100.000%
19.427%
96.610%
95.455%
37.387%
55.975%
33.526%
79.372%
96.296%
40.000%
58.824%
82.759%
47.368%
24.633%
90.566%
45.646%
25.000%
89.371%
93.333%
100.000%
80.128%
100.000%
93.269%
51.429%
62.188%
GW
60.000%
90.000%
44.186%
59.615%
74.766%
79.167%
65.316%
43.108%
98.480%
100.000%
100.000%
18.728%
96.429%
95.455%
39.113%
66.923%
35.256%
79.630%
100.000%
40.000%
55.172%
88.095%
47.059%
22.222%
93.750%
47.025%
33.333%
89.774%
92.857%
100.000%
80.851%
100.000%
95.238%
53.571%
63.231%
SW
100.000%
81.818%
64.286%
76.471%
63.636%
100.000%
21.212%
36.364%
95.000%
100.000%
25.806%
100.000%
21.818%
6.897%
17.647%
71.429%
50.000%
80.000%
68.750%
50.000%
33.858%
60.000%
26.923%
0.000%
79.412%
100.000%
100.000%
73.333%
100.000%
91.262%
42.857%
52.882%
Percent of Population Served
with At Least One Detection
Total
36.806%
99.936%
91.570%
69.521%
61.658%
93.516%
100.000%
54.105%
84.409%
99.201%
100.000%
100.000%
22.196%
99.446%
96.642%
25.363%
31.520%
24.155%
95.944%
53.842%
53.562%
96.121%
85.654%
0.742%
64.676%
42.507%
30.981%
4.545%
93.060%
97.170%
100.000%
85.101%
100.000%
97.734%
48.572%
71.796%
GW
36.806%
99.564%
77.059%
71.088%
85.794%
93.995%
60.605%
82.341%
99.506%
100.000%
100.000%
63.832%
99.411%
96.642%
52.347%
65.815%
25.468%
89.687%
100.000%
53.562%
70.329%
76.391%
1.810%
30.766%
99.691%
69.863%
20.000%
95.109%
95.734%
100.000%
89.690%
100.000%
98.287%
90.278%
79.462%
SW
100.000%
98.823%
69.202%
51.727%
93.485%
100.000%
46.075%
90.535%
98.545%
100.000%
6.507%
100.000%
4.733%
26.004%
23.055%
99.133%
12.117%
98.591%
86.423%
0.035%
71.275%
29.387%
15.220%
0.000%
89.830%
100.000%
100.000%
79.035%
100.000%
97.666%
23.795%
68.248%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A53c (Original Rule). Radium-226 228 — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 5 pCi/L
Total
0
3
7
6
30
11
1
37
7
133
2
0
8
3
7
13
32
1
3
4
4
1
19
1
0
4
32
0
41
3
2
7
74
3
3
502
GW
0
3
6
5
30
11
0
37
7
133
2
0
7
2
7
9
32
1
3
4
4
1
18
1
0
4
31
0
40
3
2
7
73
3
2
488
SW
0
0
1
1
0
0
1
0
0
0
0
0
1
1
0
4
0
0
0
0
0
0
1
0
0
0
1
0
1
0
0
0
1
0
1
14
Percent of Systems
with At Least One Detection
> 5 pCi/L
Total
0.000%
27.273%
2.602%
2.830%
24.194%
10.280%
100.000%
4.243%
1.663%
38.109%
100.000%
0.000%
2.548%
5.085%
31.818%
2.359%
20.126%
0.578%
1.345%
14.815%
20.000%
2.941%
16.379%
5.263%
0.000%
7.547%
8.443%
0.000%
4.686%
20.000%
50.000%
2.244%
25.170%
1.442%
8.571%
7.292%
GW
0.000%
30.000%
2.326%
3.205%
28.037%
11.458%
4.410%
1.754%
40.426%
100.000%
0.000%
2.473%
3.571%
31.818%
1.815%
24.615%
0.641%
1.389%
16.000%
20.000%
3.448%
21.429%
5.882%
0.000%
8.333%
8.782%
0.000%
4.756%
21.429%
66.667%
2.482%
25.086%
2.857%
7.143%
7.884%
SW
0.000%
9.091%
1.786%
0.000%
0.000%
100.000%
0.000%
0.000%
0.000%
0.000%
3.226%
33.333%
7.273%
0.000%
0.000%
0.000%
0.000%
0.000%
3.125%
0.000%
0.000%
0.000%
3.846%
0.000%
2.941%
0.000%
0.000%
0.000%
33.333%
0.000%
14.286%
2.017%
Population Served by Systems
with At Least One Detection
> 5 pCi/L
Total
0
39,261
1,584,453
52,176
9,181
2,742
715,820
120,542
1,524
838,292
928
0
262,912
751
16,590
13,822
14,142
91
1,599
23,120
3,267
1,240
4,149
100
0
929
59,388
0
97,283
116,495
154
1,504
571,748
422
7,376
4,562,001
GW
0
39,261
50,871
51,676
9,181
2,742
0
120,542
1,524
838,292
928
0
257,812
148
16,590
6,960
14,142
91
1,599
23,120
3,267
1,240
4,019
100
0
929
18,838
0
91,683
116,495
154
1,504
468,730
422
526
2,143,386
SW
0
0
1,533,582
500
0
0
715,820
0
0
0
0
0
5,100
603
0
6,862
0
0
0
0
0
0
130
0
0
0
40,550
0
5,600
0
0
0
103,018
0
6,850
2,418,615
Percent of Population Served
with At Least One Detection
> 5 pCi/L
Total
0.000%
5.062%
33.397%
0.487%
2.088%
0.257%
100.000%
4.864%
0.179%
43.164%
100.000%
0.000%
9.498%
1.633%
52.752%
2.001%
0.890%
0.017%
0.197%
3.422%
23.653%
0.192%
0.188%
0.028%
0.000%
0.122%
3.429%
0.000%
2.470%
25.755%
12.748%
0.577%
25.012%
0.042%
5.841%
9.620%
GW
0.000%
34.385%
3.218%
2.850%
7.164%
4.157%
8.800%
0.239%
63.262%
100.000%
0.000%
34.032%
0.342%
52.752%
2.326%
6.423%
0.037%
0.582%
7.207%
23.653%
2.197%
2.376%
0.070%
0.000%
0.656%
3.771%
0.000%
3.805%
38.823%
77.778%
1.013%
38.536%
0.381%
1.118%
14.283%
SW
0.000%
48.481%
0.006%
0.000%
0.000%
100.000%
0.000%
0.000%
0.000%
0.000%
0.254%
22.259%
1.753%
0.000%
0.000%
0.000%
0.000%
0.000%
0.006%
0.000%
0.000%
0.000%
3.290%
0.000%
0.366%
0.000%
0.000%
0.000%
9.632%
0.000%
8.647%
7.461%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A53d (Original Rule). Radium-226 228 — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2.5 pCi/L
Total
0
4
20
15
37
16
1
189
45
199
2
0
18
6
17
64
47
9
50
14
8
3
30
3
15
13
70
0
118
8
2
22
161
10
6
1,222
GW
0
4
17
13
36
15
0
188
43
198
2
0
17
4
17
56
47
9
49
13
8
2
28
3
12
13
69
0
117
8
2
22
160
8
5
1,185
SW
0
0
3
2
1
1
1
1
2
1
0
0
1
2
0
8
0
0
1
1
0
1
2
0
3
0
1
0
1
0
0
0
1
2
1
37
Percent of Systems
with At Least One Detection
> 2.5 pCi/L
Total
0.000%
36.364%
7.435%
7.075%
29.839%
14.953%
100.000%
21.674%
10.689%
57.020%
100.000%
0.000%
5.732%
10.169%
77.273%
11.615%
29.560%
5.202%
22.422%
51.852%
40.000%
8.824%
25.862%
15.789%
2.447%
24.528%
18.470%
0.000%
13.486%
53.333%
50.000%
7.051%
54.762%
4.808%
17.143%
17.751%
GW
0.000%
40.000%
6.589%
8.333%
33.645%
15.625%
0.000%
22.408%
10.777%
60.182%
100.000%
0.000%
6.007%
7.143%
77.273%
11.290%
36.154%
5.769%
22.685%
52.000%
40.000%
6.897%
33.333%
17.647%
2.469%
27.083%
19.547%
0.000%
13.912%
57.143%
66.667%
7.801%
54.983%
7.619%
17.857%
19.144%
SW
0.000%
0.000%
27.273%
3.571%
5.882%
9.091%
100.000%
3.030%
9.091%
5.000%
0.000%
0.000%
3.226%
66.667%
0.000%
14.545%
0.000%
0.000%
14.286%
50.000%
0.000%
20.000%
6.250%
0.000%
2.362%
0.000%
3.846%
0.000%
2.941%
0.000%
0.000%
0.000%
33.333%
1.942%
14.286%
5.331%
Population Served by Systems
with At Least One Detection
> 2.5 pCi/L
Total
0
75,210
2,241,484
430,071
36,974
15,957
715,820
483,481
293,644
1,046,785
928
0
346,267
2,037
21,258
112,051
108,462
8,353
629,360
307,499
7,398
336,210
8,553
667
58,535
23,286
157,706
0
297,167
255,415
154
7,604
1,091,022
8,178
35,810
9,163,346
GW
0
75,210
82,677
193,571
24,774
3,726
0
398,453
107,504
1,044,949
928
0
341,167
371
21,258
98,173
108,462
8,353
117,196
264,499
7,398
1,840
7,953
667
30,518
23,286
117,156
0
291,567
255,415
154
7,604
988,004
1,153
28,960
4,652,946
SW
0
0
2,158,807
236,500
12,200
12,231
715,820
85,028
186,140
1,836
0
0
5,100
1,666
0
13,878
0
0
512,164
43,000
0
334,370
600
0
28,017
0
40,550
0
5,600
0
0
0
103,018
7,025
6,850
4,510,400
Percent of Population Served
with At Least One Detection
> 2.5 pCi/L
Total
0.000%
9.697%
47.246%
4.017%
8.410%
1.494%
100.000%
19.508%
34.483%
53.899%
100.000%
0.000%
12.509%
4.429%
67.595%
16.222%
6.825%
1.530%
77.353%
45.510%
53.562%
52.074%
0.387%
0.186%
2.271%
3.070%
9.105%
0.000%
7.545%
56.467%
12.748%
2.916%
47.729%
0.807%
28.358%
19.323%
GW
0.000%
65.870%
5.229%
10.677%
19.331%
5.648%
0.000%
29.090%
16.887%
78.858%
100.000%
0.000%
45.035%
0.857%
67.595%
32.805%
49.264%
3.356%
42.663%
82.452%
53.562%
3.260%
4.703%
0.467%
7.268%
16.449%
23.451%
0.000%
12.100%
85.119%
77.778%
5.122%
81.228%
1.041%
61.538%
31.007%
SW
0.000%
0.000%
68.246%
2.659%
3.917%
1.221%
100.000%
7.670%
86.602%
0.298%
0.000%
0.000%
0.254%
61.499%
0.000%
3.545%
0.000%
0.000%
95.037%
12.117%
0.000%
56.750%
0.029%
0.000%
1.299%
0.000%
3.290%
0.000%
0.366%
0.000%
0.000%
0.000%
9.632%
0.779%
8.647%
13.914%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A53 (Revised Rule). Radium-226 228 — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 5 pCi/L
> 2.5 pCi/L
> 5 pCi/L
> 2.5 pCi/L
> 5 pCi/L
> 2.5 pCi/L
Total # Systems
Reporting
3,472
3,472
421
421
3,893
3,893
# Systems Exceeding
Threshold of Interest
432
1,008
14
47
446
1,055
% Systems Exceeding
Threshold of Interest
12.442%
29.032%
3.325%
11.164%
11.456%
27.100%
Total Pop. Served by
Systems Reporting
11,709,681
11,709,681
29,716,756
29,716,756
41,426,437
41,426,437
Total Pop. Served by
Systems Exceeding
Threshold of Interest
2,438,570
4,280,726
1,372,884
3,100,164
3,811,454
7,380,890
% Pop. Served by
Systems Exceeding
Threshold of Interest
20.825%
36.557%
4.620%
10.432%
9.201%
17.817%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A53a (Revised Rule). Radium-226 228 — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
522
36
610
1,094
870
1,504
6
422
154
2,851
2
279
18
697
464
2,815
5
130
1,489
599
532
1,362
50
50
29
860
25
26
33
143
207
90
76
18,050
GW
454
11
435
661
663
1,383
5
412
147
2,832
1
219
18
696
449
2,583
5
126
1,146
555
489
1,166
49
43
24
789
25
14
32
117
207
73
66
15,895
SW
68
25
175
433
207
121
1
10
7
19
1
60
0
1
15
232
0
4
343
44
43
196
1
7
5
71
0
12
1
26
0
17
10
2,155
Percent of Samples
with Detections
Total
93.295%
94.444%
18.689%
16.271%
75.862%
37.566%
66.667%
89.810%
29.221%
98.843%
100.000%
59.140%
100.000%
99.570%
19.181%
54.210%
60.000%
45.385%
73.674%
46.745%
52.820%
84.875%
48.000%
14.000%
24.138%
53.372%
96.000%
53.846%
48.485%
87.413%
97.585%
94.444%
100.000%
64.781%
GW
92.731%
90.909%
21.379%
18.759%
76.621%
39.407%
60.000%
91.505%
29.252%
98.976%
100.000%
66.210%
100.000%
99.569%
19.376%
56.833%
60.000%
46.825%
76.963%
46.486%
50.102%
86.106%
48.980%
16.279%
29.167%
56.274%
96.000%
92.857%
50.000%
88.889%
97.585%
94.521%
100.000%
67.732%
SW
97.059%
96.000%
12.000%
12.471%
73.430%
16.529%
100.000%
20.000%
28.571%
78.947%
100.000%
33.333%
0.000%
100.000%
13.333%
25.000%
0.000%
0.000%
62.682%
50.000%
83.721%
77.551%
0.000%
0.000%
0.000%
21.127%
0.000%
8.333%
0.000%
80.769%
0.000%
94.118%
100.000%
43.016%
Minimum Detect
Concentration (pCi/L)
Total
0.01
0.1
0.0008
0.053
0.04
0.1
1.58
0.6
0.1
0.1
0.25
0.1
0.26
0.1
0.2
0.13
0.166
0.3
1
0.01
0.0165
0.008
1.08
0.3
1.11
1
1
1
0.671
0.03
0.03
0.1
0.2
0.0008
GW
0.04
0.12
0.0008
0.16
0.04
0.1
1.58
0.6
0.1
0.1
0.25
0.1
0.26
0.1
0.2
0.13
0.166
0.3
1
0.01
0.0165
0.008
1.08
0.3
1.11
1
1
1
0.671
0.03
0.03
0.1
0.2
0.0008
SW
0.01
0.1
0.2
0.053
0.1
1.01
27.789
0.8
0.4
0.13
2.6
0.1
0.1
0.6
0.18
1
0.04
0.079
0.03
1
3
0.1
0.1
0.6
0.01
Median Detect
Concentration (pCi/L)
Total
0.47
0.5
0.7
0.934
1
1.5
4.3
2.9
0.5
3.507
1.425
1.8
1.508
2.95
0.7
3.4
1.15
2.1
2.7
0.4035
0.461
1.1015
2.86
0.74
1.3
3.5
1
2
1.59
0.7
3.85
0.8
1
2
GW
0.47
1.17
0.98
1.035
1.2
1.5
4.04
3
0.5
3.55
0.25
1.9
1.508
3
0.7
3.5
1.15
2.1
3.11
0.41
0.431
1.18
2.86
0.74
1.3
3.5
1
2
1.59
0.795
3.85
1
1
2.3
SW
0.49
0.45
0.3
0.82
0.55
1.5
27.789
0.9
0.75
1.57
2.6
0.75
0.1
0.7
0.95
1.5
0.235
0.6305
0.8
2.3
3
0.3
0.41
1.6
1
90th Percentile Detect
Concentration (pCi/L)
Total
1.01
1.4
2.6
2.8
7.65
4.9
27.789
5.4
1.9
10.8
2.6
6.7
19.32
11.1
3.1
9.3
1.5
4.7
5.46
3.07
1.37
4.12
6.04
1.85
1.7
8
2.91
4
4.44
6.1
6.7
4.4
3
7.8
GW
1.01
3.225
3.1
3.9
10.07
4.92
4.56
5.4
1.9
10.84
0.25
6.8
19.32
11.1
3.1
9.3
1.5
4.7
5.72
3.28
1.4
4.2
6.04
1.85
1.7
8.1
2.91
4
4.44
6.2
6.7
4.5
2.5
8.1
SW
0.86
0.8
0.57
1.4
1.9
2.385
27.789
1
1.1
8.1
2.6
2.295
0.1
0.8
1.43
4.56
1.36
1.24
3.2
5.4
3
1.3
1.5
3.05
3
Maximum Detect
Concentration (pCi/L)
Total
4.45
3.3
8.3
11.03
40.3
56.66
27.789
11.2
3
32.84
2.6
12.9
21
32.7
6.4
31.1
1.5
11.6
20.41
22.3
7.62
22.4
7.26
1.85
1.7
33.6
4
4
4.55
14.87
14.8
7
5.9
56.66
GW
4.45
3.3
8.3
11.03
40.3
56.66
4.56
11.2
3
32.84
0.25
12.9
21
32.7
6.4
31.1
1.5
11.6
20.41
22.3
7.62
22.4
7.26
1.85
1.7
33.6
4
4
4.55
14.87
14.8
7
5.9
56.66
SW
1.83
1.9
1.2
3.4
10
3.75
27.789
1
1.1
9.1
2.6
2.78
0.1
0.8
1.9
7.22
2.082
1.4771
9.02
6.1
3
1.8
1.89
3.1
27.789
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A53b (Revised Rule). Radium-226 228 — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
141
11
139
163
204
283
3
170
79
472
2
96
11
210
167
404
3
50
125
283
86
362
27
28
6
150
11
8
17
63
61
38
20
3,893
GW
118
8
127
118
153
265
2
166
77
461
1
77
11
209
160
363
3
49
95
258
81
298
26
22
5
128
11
7
16
53
61
26
17
3,472
SW
23
3
12
45
51
18
1
4
2
11
1
19
0
1
7
41
0
1
30
25
5
64
1
6
1
22
0
1
1
10
0
12
3
421
Total Population Served by Systems
Reporting
Total
92,837
1,051,258
4,573,238
9,301,445
3,169,671
1,463,874
111,360
557,475
610,810
2,256,473
101,482
2,527,642
1,746
211,284
69,849
2,816,439
269
623,950
6,565,156
1,363,603
464,030
979,416
33,974
43,482
83,717
1,225,431
16,869
206,396
133,660
160,030
489,065
41,652
78,854
41,426,437
GW
70,944
38,578
1,328,714
1,992,068
253,727
139,544
6,090
252,579
421,610
1,679,294
84,935
519,882
1,746
211,261
54,111
436,906
269
111,786
1,633,380
1,122,055
155,491
300,365
18,774
36,292
32,967
205,071
16,869
54,136
4,708
23,036
489,065
7,642
5,786
11,709,681
SW
21,893
1,012,680
3,244,524
7,309,377
2,915,944
1,324,330
105,270
304,896
189,200
577,179
16,547
2,007,760
0
23
15,738
2,379,533
0
512,164
4,931,776
241,548
308,539
679,051
15,200
7,190
50,750
1,020,360
0
152,260
128,952
136,994
0
34,010
73,068
29,716,756
Percent of Systems
with At Least One Detection
Total
92.908%
90.909%
34.532%
32.515%
83.333%
69.258%
66.667%
88.235%
32.911%
97.881%
100.000%
58.333%
100.000%
100.000%
26.347%
51.485%
100.000%
48.000%
87.200%
53.004%
55.814%
88.122%
51.852%
21.429%
66.667%
46.667%
90.909%
87.500%
52.941%
88.889%
98.361%
94.737%
100.000%
69.972%
GW
93.220%
87.500%
31.496%
31.356%
86.275%
72.075%
50.000%
89.157%
32.468%
98.482%
100.000%
63.636%
100.000%
100.000%
26.250%
53.168%
100.000%
48.980%
86.316%
51.938%
54.321%
89.597%
53.846%
27.273%
80.000%
52.344%
90.909%
85.714%
56.250%
88.679%
98.361%
92.308%
100.000%
71.083%
SW
91.304%
100.000%
66.667%
35.556%
74.510%
27.778%
100.000%
50.000%
50.000%
72.727%
100.000%
36.842%
0.000%
100.000%
28.571%
36.585%
0.000%
0.000%
90.000%
64.000%
80.000%
81.250%
0.000%
0.000%
0.000%
13.636%
0.000%
100.000%
0.000%
90.000%
0.000%
100.000%
100.000%
60.808%
Percent of Population Served
with At Least One Detection
Total
91.996%
99.732%
37.946%
28.412%
46.502%
18.964%
99.919%
56.854%
65.817%
96.420%
100.000%
89.884%
100.000%
100.000%
41.840%
69.181%
100.000%
5.290%
87.086%
47.375%
94.789%
69.172%
21.466%
21.899%
39.170%
15.767%
12.644%
99.855%
1.491%
64.017%
99.775%
99.400%
100.000%
56.754%
GW
91.086%
92.706%
25.561%
53.616%
94.061%
78.576%
98.522%
67.187%
51.236%
99.758%
100.000%
85.004%
100.000%
100.000%
41.054%
58.076%
100.000%
29.524%
95.974%
40.005%
84.641%
61.817%
38.846%
26.237%
99.469%
62.744%
12.644%
99.446%
42.332%
93.775%
99.775%
96.729%
100.000%
68.876%
SW
94.944%
100.000%
43.018%
21.543%
42.363%
12.683%
100.000%
48.295%
98.309%
86.707%
100.000%
91.148%
0.000%
100.000%
44.542%
71.220%
0.000%
0.000%
84.143%
81.607%
99.903%
72.425%
0.000%
0.000%
0.000%
6.326%
0.000%
100.000%
0.000%
59.013%
0.000%
100.000%
100.000%
51.978%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A53c (Revised Rule). Radium-226 228 — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 5 pCi/L
Total
0
0
2
4
39
17
1
21
0
132
0
4
2
34
1
57
0
2
42
3
1
25
3
0
0
27
0
0
0
5
20
2
2
446
GW
0
0
2
4
36
17
0
21
0
130
0
4
2
34
1
57
0
2
38
3
1
22
3
0
0
26
0
0
0
5
20
2
2
432
SW
0
0
0
0
3
0
1
0
0
2
0
0
0
0
0
0
0
0
4
0
0
3
0
0
0
1
0
0
0
0
0
0
0
14
Percent of Systems
with At Least One Detection
> 5 pCi/L
Total
0.000%
0.000%
1.439%
2.454%
19.118%
6.007%
33.333%
12.353%
0.000%
27.966%
0.000%
4.167%
18.182%
16.190%
0.599%
14.109%
0.000%
4.000%
33.600%
1.060%
1.163%
6.906%
11.111%
0.000%
0.000%
18.000%
0.000%
0.000%
0.000%
7.937%
32.787%
5.263%
10.000%
11.456%
GW
0.000%
0.000%
1.575%
3.390%
23.529%
6.415%
0.000%
12.651%
0.000%
28.200%
0.000%
5.195%
18.182%
16.268%
0.625%
15.702%
0.000%
4.082%
40.000%
1.163%
1.235%
7.383%
11.538%
0.000%
0.000%
20.313%
0.000%
0.000%
0.000%
9.434%
32.787%
7.692%
11.765%
12.442%
SW
0.000%
0.000%
0.000%
0.000%
5.882%
0.000%
100.000%
0.000%
0.000%
18.182%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
13.333%
0.000%
0.000%
4.688%
0.000%
0.000%
0.000%
4.545%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.325%
Population Served by Systems
with At Least One Detection
> 5 pCi/L
Total
0
0
63,865
17,752
49,240
3,149
105,270
44,955
0
1,050,977
0
250,026
163
69,634
540
60,229
0
1,833
1,888,978
2,840
663
11,670
852
0
0
74,993
0
0
0
865
111,935
280
745
3,811,454
GW
0
0
63,865
17,752
42,290
3,149
0
44,955
0
860,191
0
250,026
163
69,634
540
60,229
0
1,833
862,698
2,840
663
8,622
852
0
0
34,443
0
0
0
865
111,935
280
745
2,438,570
SW
0
0
0
0
6,950
0
105,270
0
0
190,786
0
0
0
0
0
0
0
0
1,026,280
0
0
3,048
0
0
0
40,550
0
0
0
0
0
0
0
1,372,884
Percent of Population Served
with At Least One Detection
> 5 pCi/L
Total
0.000%
0.000%
1.396%
0.191%
1.553%
0.215%
94.531%
8.064%
0.000%
46.576%
0.000%
9.892%
9.336%
32.958%
0.773%
2.138%
0.000%
0.294%
28.773%
0.208%
0.143%
1.192%
2.508%
0.000%
0.000%
6.120%
0.000%
0.000%
0.000%
0.541%
22.888%
0.672%
0.945%
9.201%
GW
0.000%
0.000%
4.807%
0.891%
16.668%
2.257%
0.000%
17.798%
0.000%
51.223%
0.000%
48.093%
9.336%
32.961%
0.998%
13.785%
0.000%
1.640%
52.817%
0.253%
0.426%
2.871%
4.538%
0.000%
0.000%
16.796%
0.000%
0.000%
0.000%
3.755%
22.888%
3.664%
12.876%
20.825%
SW
0.000%
0.000%
0.000%
0.000%
0.238%
0.000%
100.000%
0.000%
0.000%
33.055%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
20.810%
0.000%
0.000%
0.449%
0.000%
0.000%
0.000%
3.974%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.620%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A53d (Revised Rule). Radium-226 228 — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2.5 pCi/L
Total
3
2
9
11
56
90
2
96
1
265
1
13
2
61
6
111
0
6
73
17
4
96
7
0
0
53
4
3
4
11
38
4
6
1,055
GW
3
2
9
9
49
88
1
96
1
262
0
12
2
61
6
111
0
6
61
17
4
82
7
0
0
51
4
2
4
11
38
4
5
1,008
SW
0
0
0
2
7
2
1
0
0
3
1
1
0
0
0
0
0
0
12
0
0
14
0
0
0
2
0
1
0
0
0
0
1
47
Percent of Systems
with At Least One Detection
> 2.5 pCi/L
Total
2.128%
18.182%
6.475%
6.748%
27.451%
31.802%
66.667%
56.471%
1.266%
56.144%
50.000%
13.542%
18.182%
29.048%
3.593%
27.475%
0.000%
12.000%
58.400%
6.007%
4.651%
26.519%
25.926%
0.000%
0.000%
35.333%
36.364%
37.500%
23.529%
17.460%
62.295%
10.526%
30.000%
27.100%
GW
2.542%
25.000%
7.087%
7.627%
32.026%
33.208%
50.000%
57.831%
1.299%
56.833%
0.000%
15.584%
18.182%
29.187%
3.750%
30.579%
0.000%
12.245%
64.211%
6.589%
4.938%
27.517%
26.923%
0.000%
0.000%
39.844%
36.364%
28.571%
25.000%
20.755%
62.295%
15.385%
29.412%
29.032%
SW
0.000%
0.000%
0.000%
4.444%
13.725%
11.111%
100.000%
0.000%
0.000%
27.273%
100.000%
5.263%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
40.000%
0.000%
0.000%
21.875%
0.000%
0.000%
0.000%
9.091%
0.000%
100.000%
0.000%
0.000%
0.000%
0.000%
33.333%
11.164%
Population Served by Systems
with At Least One Detection
> 2.5 pCi/L
Total
560
11,721
137,300
482,626
230,225
142,649
111,270
141,891
94
1,410,014
16,547
270,211
163
98,354
865
167,069
0
2,301
3,031,317
93,899
26,215
244,030
2,862
0
0
154,547
775
155,310
544
2,324
373,042
532
71,633
7,380,890
GW
560
11,721
137,300
190,511
103,211
43,702
6,000
141,891
94
1,212,402
0
265,111
163
98,354
865
167,069
0
2,301
1,270,041
93,899
26,215
26,341
2,862
0
0
98,381
775
3,050
544
2,324
373,042
532
1,465
4,280,726
SW
0
0
0
292,115
127,014
98,947
105,270
0
0
197,612
16,547
5,100
0
0
0
0
0
0
1,761,276
0
0
217,689
0
0
0
56,166
0
152,260
0
0
0
0
70,168
3,100,164
Percent of Population Served
with At Least One Detection
> 2.5 pCi/L
Total
0.603%
1.115%
3.002%
5.189%
7.263%
9.745%
99.919%
25.452%
0.015%
62.488%
16.305%
10.690%
9.336%
46.551%
1.238%
5.932%
0.000%
0.369%
46.173%
6.886%
5.649%
24.916%
8.424%
0.000%
0.000%
12.612%
4.594%
75.249%
0.407%
1.452%
76.277%
1.277%
90.843%
17.817%
GW
0.789%
30.383%
10.333%
9.563%
40.678%
31.318%
98.522%
56.177%
0.022%
72.197%
0.000%
50.994%
9.336%
46.556%
1.599%
38.239%
0.000%
2.058%
77.755%
8.368%
16.859%
8.770%
15.244%
0.000%
0.000%
47.974%
4.594%
5.634%
11.555%
10.089%
76.277%
6.962%
25.320%
36.557%
SW
0.000%
0.000%
0.000%
3.996%
4.356%
7.471%
100.000%
0.000%
0.000%
34.238%
100.000%
0.254%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
35.713%
0.000%
0.000%
32.058%
0.000%
0.000%
0.000%
5.505%
0.000%
100.000%
0.000%
0.000%
0.000%
0.000%
96.031%
10.432%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A54. Selenium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 0.05 mg/L
> 0.025 mg/L
> 0.05 mg/L
> 0.025 mg/L
> 0.05 mg/L
> 0.025 mg/L
Total # Systems
Reporting
44,924
44,924
4,001
4,001
48,925
48,925
# Systems Exceeding
Threshold of Interest
63
252
2
28
65
280
% Systems Exceeding
Threshold of Interest
0.140%
0.561%
0.050%
0.700%
0.133%
0.572%
Total Pop. Served by
Systems Reporting
85,462,006
85,462,006
144,401,405
144,401,405
229,863,411
229,863,411
Total Pop. Served by
Systems Exceeding
Threshold of Interest
123,164
750,440
101,652
4,034,609
224,816
4,785,049
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.144%
0.878%
0.070%
2.794%
0.098%
2.082%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A54a. Selenium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
874
2,643
2,180
6,317
35,322
4,423
2,595
686
2,141
2,700
1,178
1,511
2,652
3,392
4,704
1,778
2,941
5,085
2,703
6,119
3,329
5,705
2,756
9,233
357
1,940
2,930
6,574
3,540
1,870
3,389
4,080
424
1,313
888
3,443
388
1,656
14,806
6,996
2,802
2,080
7,007
1,112
1,122
181,684
GW
617
1,794
1,516
4,988
21,147
2,367
1,873
638
2,072
2,377
1,116
1,249
2,382
2,991
4,221
537
1,978
3,969
2,305
5,945
3,280
4,928
2,473
7,799
313
1,854
2,766
5,853
3,214
1,292
2,535
3,447
350
952
658
2,980
359
483
12,227
5,459
2,193
1,756
6,835
424
875
141,387
SW
257
849
664
1,329
14,175
2,056
722
48
69
323
62
262
270
401
483
1,241
963
1,116
398
174
49
111
283
1,434
44
86
164
721
326
578
854
633
74
361
230
463
29
1,173
2,579
1,537
609
324
172
688
247
40,297
Percent of Samples
with Detections
Total
3.204%
1.400%
0.367%
11.065%
10.011%
19.127%
2.235%
28.280%
18.449%
0.037%
0.170%
3.508%
4.563%
13.738%
3.550%
6.805%
3.196%
2.852%
10.877%
31.786%
0.421%
3.996%
5.806%
1.700%
70.588%
36.649%
0.137%
4.198%
40.480%
26.898%
4.574%
4.534%
16.274%
2.437%
0.338%
1.888%
37.629%
7.065%
23.680%
60.206%
0.678%
0.529%
7.250%
4.137%
8.734%
12.175%
GW
3.241%
0.669%
0.462%
10.866%
12.900%
24.546%
2.723%
29.467%
18.678%
0.042%
0.179%
4.003%
4.618%
12.638%
3.293%
5.587%
3.387%
1.159%
11.584%
30.463%
0.427%
4.058%
5.985%
1.769%
69.329%
38.080%
0.145%
4.186%
41.661%
30.495%
4.379%
4.845%
14.286%
2.941%
0.456%
2.148%
37.326%
2.277%
20.790%
64.096%
0.775%
0.626%
7.403%
7.547%
9.943%
12.790%
SW
3.113%
2.945%
0.151%
11.813%
5.700%
12.889%
0.970%
12.500%
11.594%
0.000%
0.000%
1.145%
4.074%
21.945%
5.797%
7.333%
2.804%
8.871%
6.784%
77.011%
0.000%
3.604%
4.240%
1.325%
79.545%
5.814%
0.000%
4.300%
28.834%
18.858%
5.152%
2.844%
25.676%
1.108%
0.000%
0.216%
41.379%
9.037%
37.379%
46.389%
0.328%
0.000%
1.163%
2.035%
4.453%
10.016%
Minimum Detect
Concentration (mg/L)
Total
0.00112
0.0002
0.005
0.0006
7.6E-05
0.00006
0.0002
0.0001
0.0001
0.02
0.005
0.001
0.0005
0.001
0.0008
0.00024
0.00086
0.00034
0.001
0.00015
0.00516
0.001
0.0003
0.0004
0.00102
0.005
0.0069
0.0003
0.0004
0.0001
0.00019
0.00167
0.0015
0.00061
0.005
0.002
0.0008
0.00021
0.0012
0.0001
0.002
0.0009
0.00035
0.00033
0.0011
0.00006
GW
0.00131
0.00103
0.005
0.0006
7.6E-05
0.0002
0.0003
0.0001
0.0001
0.02
0.005
0.001
0.0005
0.001
0.0008
0.0005
0.00086
0.0006
0.001
0.00015
0.00516
0.001
0.0003
0.0004
0.00102
0.005
0.0069
0.0003
0.0004
0.0001
0.00019
0.00167
0.0015
0.00069
0.005
0.002
0.0008
0.001
0.0012
0.0002
0.002
0.0009
0.00035
0.00063
0.0011
7.6E-05
SW
0.00112
0.0002
0.0059
0.001
0.00012
0.00006
0.0002
0.0005
0.001
0.002
0.001
0.001
0.0012
0.00024
0.001
0.00034
0.001
0.0005
0.00104
0.001
0.001
0.00107
0.00509
0.0004
0.0006
0.00022
0.001
0.002
0.0021
0.00061
0.0031
0.001
0.00021
0.002
0.0001
0.01
0.0009
0.00033
0.0023
0.00006
Median Detect
Concentration (mg/L)
Total
0.00346
0.002
0.0062
0.0043
0.005
0.0043
0.006
0.0005
0.002
0.02
0.0055
0.02
0.003
0.0021
0.003
0.003
0.003
0.001
0.001
0.001
0.00657
0.00193
0.003
0.006
0.00277
0.00955
0.04
0.003
0.0028
0.002
0.002
0.0047
0.01
0.00201
0.01
0.0031
0.003
0.0015
0.0048
0.00178
0.01
0.002
0.0014
0.005
0.006
0.003
GW
0.00374
0.0021
0.0064
0.005
0.005
0.005
0.006
0.0005
0.002
0.02
0.0055
0.02
0.003
0.00215
0.003
0.003
0.003
0.004
0.001
0.001
0.00657
0.00199
0.003
0.0065
0.00292
0.00962
0.04
0.003
0.0029
0.002
0.0027
0.0049
0.025
0.00301
0.01
0.00305
0.00345
0.0015
0.0053
0.0019
0.01
0.002
0.0014
0.005
0.006
0.003
SW
0.0025
0.002
0.0059
0.0031
0.005
0.003
0.003
0.0006
0.003
0.009
0.0026
0.002
0.003
0.0022
0.003
0.001
0.001
0.001
0.00174
0.0025
0.005
0.00188
0.00542
0.002
0.00225
0.002
0.00183
0.004
0.01
0.0015
0.0031
0.0015
0.0015
0.0041
0.0013
0.01
0.00145
0.00275
0.006
0.003
90th Percentile Detect
Concentration (mg/L)
Total
0.00631
0.0063
0.04
0.01
0.02
0.02
0.01
0.0026
0.006
0.02
0.006
0.03
0.01
0.006
0.01
0.006
0.006
0.02
0.001
0.003
0.00924
0.0059
0.01
0.02
0.00948
0.04
0.1
0.007
0.01
0.006
0.007
0.0092
0.06
0.01
0.01
0.0054
0.009
0.003
0.01
0.0047
0.01
0.04
0.00385
0.01
0.01
0.01
GW
0.00816
0.01
0.04
0.01
0.02
0.02
0.01
0.0027
0.006
0.02
0.006
0.03
0.01
0.0066
0.01
0.0085
0.007
0.02
0.001
0.003
0.00924
0.00597
0.01
0.02
0.00948
0.04
0.1
0.007
0.01
0.00665
0.0082
0.00932
0.075
0.01
0.01
0.0054
0.0092
0.0029
0.02
0.0048
0.01
0.04
0.00385
0.01
0.01
0.01
SW
0.00491
0.0035
0.0059
0.0057
0.01
0.01
0.01
0.0007
0.004
0.01
0.0077
0.005
0.0091
0.0059
0.005
0.007
0.001
0.003
0.0026
0.006
0.02
0.01
0.00646
0.004
0.0053
0.005
0.00398
0.006
0.03
0.0067
0.0031
0.0018
0.003
0.01
0.0046
0.01
0.002
0.0051
0.007
0.0087
Maximum Detect
Concentration (mg/L)
Total
0.02
0.01
0.04
0.42
0.49
0.18
0.05
0.02
0.03
0.02
0.006
0.05
0.03
0.06
0.03
0.01
0.01
0.05
0.01
0.14
0.00985
0.02
0.05
0.18
0.09
0.2
0.1
0.17
0.23
0.06
0.03
0.04
0.19
0.01
0.01
0.02
0.02
0.01
0.19
0.18
0.01
0.38
0.05
0.01
0.08
0.49
GW
0.02
0.01
0.04
0.42
0.49
0.18
0.05
0.02
0.03
0.02
0.006
0.05
0.03
0.06
0.03
0.01
0.01
0.02
0.01
0.14
0.00985
0.02
0.05
0.18
0.09
0.2
0.1
0.17
0.23
0.06
0.03
0.04
0.19
0.01
0.01
0.02
0.02
0.01
0.19
0.18
0.01
0.38
0.05
0.01
0.08
0.49
SW
0.00491
0.01
0.0059
0.04
0.2
0.04
0.01
0.0007
0.004
0.01
0.01
0.01
0.01
0.01
0.01
0.05
0.01
0.04
0.00638
0.01
0.02
0.03
0.00646
0.03
0.02
0.01
0.01
0.0071
0.03
0.0067
0.0031
0.002
0.01
0.04
0.01
0.01
0.002
0.01
0.009
0.2
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A54b. Selenium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
492
352
453
1,050
3,812
838
1,170
281
1,333
1,587
107
966
894
1,490
1,623
242
676
1,038
806
2,993
1,459
1,420
846
2,283
217
731
1,216
1,374
724
324
1,574
1,917
202
731
143
823
235
350
4,888
507
1,581
599
1,823
451
304
48,925
GW
391
279
381
1,002
3,289
617
1,131
278
1,307
1,473
95
933
847
1,387
1,574
93
558
970
752
2,941
1,432
1,343
787
2,144
190
720
1,175
1,337
685
304
1,333
1,792
175
610
134
758
224
161
4,547
457
1,413
557
1,803
290
255
44,924
SW
101
73
72
48
523
221
39
3
26
114
12
33
47
103
49
149
118
68
54
52
27
77
59
139
27
11
41
37
39
20
241
125
27
121
9
65
11
189
341
50
168
42
20
161
49
4,001
Total Population Served by Systems
Reporting
Total
546,472
4,701,100
2,452,800
6,162,056
36,243,379
4,998,506
2,716,176
679,823
17,371,144
7,241,184
1,303,767
2,499,860
1,048,642
9,168,134
4,980,057
4,602,489
8,525,575
5,022,488
727,707
6,681,481
3,959,159
3,006,718
757,540
6,973,518
563,069
1,449,290
942,517
7,762,423
1,667,433
970,526
11,201,957
10,218,949
749,266
2,770,064
913,584
3,468,333
328,972
5,683,572
25,060,220
2,543,652
4,803,093
490,639
4,044,416
1,415,477
446,184
229,863,411
GW
210,251
1,463,066
909,774
2,791,465
13,413,210
533,275
382,254
398,423
15,125,102
1,348,853
1,249,139
1,391,234
805,767
2,968,062
2,619,602
375,460
1,718,151
1,024,381
292,103
1,889,150
2,725,622
1,692,257
365,141
1,708,352
257,844
672,810
392,718
2,726,477
1,400,885
280,727
1,222,509
3,124,012
276,712
486,818
173,606
809,806
237,011
1,460,816
9,275,719
1,686,017
634,027
226,871
2,352,672
234,687
129,168
85,462,006
SW
336,221
3,238,034
1,543,026
3,370,591
22,830,169
4,465,231
2,333,922
281,400
2,246,042
5,892,331
54,628
1,108,626
242,875
6,200,072
2,360,455
4,227,029
6,807,424
3,998,107
435,604
4,792,331
1,233,537
1,314,461
392,399
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,799
9,979,448
7,094,937
472,554
2,283,246
739,978
2,658,527
91,961
4,222,756
15,784,501
857,635
4,169,066
263,768
1,691,744
1,180,790
317,016
144,401,405
Percent of Systems
with At Least One Detection
Total
5.081%
7.955%
1.104%
26.762%
18.258%
41.169%
4.444%
47.331%
21.230%
0.063%
1.869%
3.209%
7.606%
21.409%
7.209%
33.471%
8.876%
4.913%
26.799%
40.194%
0.685%
10.986%
13.239%
5.344%
74.194%
41.313%
0.329%
11.790%
55.110%
51.543%
8.005%
7.929%
10.891%
3.830%
1.399%
4.010%
46.383%
9.143%
31.015%
76.726%
1.012%
1.669%
19.035%
8.204%
14.803%
17.284%
GW
4.859%
3.943%
1.050%
25.150%
18.030%
39.708%
4.156%
46.763%
21.117%
0.068%
2.105%
3.001%
7.556%
19.827%
6.607%
24.731%
8.602%
3.711%
26.064%
39.510%
0.698%
10.424%
13.469%
5.084%
73.684%
41.389%
0.340%
11.219%
55.912%
50.329%
6.752%
7.924%
10.857%
3.934%
1.493%
4.222%
45.982%
6.832%
28.172%
78.775%
0.991%
1.795%
19.135%
9.310%
15.686%
16.715%
SW
5.941%
23.288%
1.389%
60.417%
19.694%
45.249%
12.821%
100.000%
26.923%
0.000%
0.000%
9.091%
8.511%
42.718%
26.531%
38.926%
10.169%
22.059%
37.037%
78.846%
0.000%
20.779%
10.169%
9.353%
77.778%
36.364%
0.000%
32.432%
41.026%
70.000%
14.938%
8.000%
11.111%
3.306%
0.000%
1.538%
54.545%
11.111%
68.915%
58.000%
1.190%
0.000%
10.000%
6.211%
10.204%
23.669%
Percent of Population Served
with At Least One Detection
Total
42.405%
26.905%
1.413%
65.396%
56.543%
40.000%
17.810%
73.448%
45.578%
0.002%
0.466%
11.162%
20.501%
22.588%
23.677%
51.189%
51.067%
46.779%
26.751%
85.026%
2.817%
15.734%
25.040%
4.849%
81.228%
80.227%
0.204%
40.865%
45.800%
91.351%
2.591%
6.947%
31.910%
30.564%
4.663%
1.229%
48.679%
14.824%
62.609%
82.074%
2.408%
0.310%
13.114%
13.121%
40.431%
37.048%
GW
2.183%
1.970%
2.809%
37.701%
57.515%
49.461%
6.003%
54.695%
48.546%
0.009%
0.487%
2.880%
24.640%
32.118%
27.157%
32.276%
9.521%
33.269%
35.265%
59.186%
4.091%
18.082%
28.164%
7.050%
73.501%
62.655%
0.489%
43.179%
42.977%
73.576%
8.113%
3.415%
29.516%
11.062%
24.538%
3.605%
59.749%
4.976%
31.420%
85.922%
1.279%
0.671%
21.178%
10.236%
39.599%
34.217%
SW
67.558%
38.171%
0.589%
88.332%
55.972%
38.871%
19.744%
100.000%
25.593%
0.000%
0.000%
21.556%
6.770%
18.025%
19.814%
52.869%
61.553%
50.241%
21.043%
95.212%
0.000%
12.711%
22.132%
4.135%
87.757%
95.452%
0.000%
39.612%
60.635%
98.585%
1.915%
8.502%
33.312%
34.722%
0.000%
0.505%
20.149%
18.231%
80.938%
74.508%
2.580%
0.000%
1.899%
13.695%
40.770%
38.724%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A54c. Selenium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.05 mg/L
Total
0
0
0
3
16
4
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
4
1
8
2
1
5
2
0
0
5
0
0
0
0
0
7
3
0
1
0
0
1
65
GW
0
0
0
3
14
4
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
4
1
8
2
1
5
2
0
0
5
0
0
0
0
0
7
3
0
1
0
0
1
63
SW
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
Percent of Systems
with At Least One Detection
> 0.05 mg/L
Total
0.000%
0.000%
0.000%
0.286%
0.420%
0.477%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.067%
0.000%
0.000%
0.000%
0.000%
0.000%
0.033%
0.000%
0.000%
0.000%
0.175%
0.461%
1.094%
0.164%
0.073%
0.691%
0.617%
0.000%
0.000%
2.475%
0.000%
0.000%
0.000%
0.000%
0.000%
0.143%
0.592%
0.000%
0.167%
0.000%
0.000%
0.329%
0.133%
GW
0.000%
0.000%
0.000%
0.299%
0.426%
0.648%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.034%
0.000%
0.000%
0.000%
0.187%
0.526%
1.111%
0.170%
0.075%
0.730%
0.658%
0.000%
0.000%
2.857%
0.000%
0.000%
0.000%
0.000%
0.000%
0.154%
0.656%
0.000%
0.180%
0.000%
0.000%
0.392%
0.140%
SW
0.000%
0.000%
0.000%
0.000%
0.382%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.050%
Population Served by Systems
with At Least One Detection
> 0.05 mg/L
Total
0
0
0
6,432
138,673
3,725
0
0
0
0
0
0
0
60
0
0
0
0
0
263
0
0
0
13,705
761
3,643
98
145
1,095
593
0
0
46,475
0
0
0
0
0
702
8,200
0
168
0
0
78
224,816
GW
0
0
0
6,432
37,021
3,725
0
0
0
0
0
0
0
60
0
0
0
0
0
263
0
0
0
13,705
761
3,643
98
145
1,095
593
0
0
46,475
0
0
0
0
0
702
8,200
0
168
0
0
78
123,164
SW
0
0
0
0
101,652
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
101,652
Percent of Population Served
with At Least One Detection
> 0.05 mg/L
Total
0.000%
0.000%
0.000%
0.104%
0.383%
0.075%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
0.000%
0.000%
0.000%
0.197%
0.135%
0.251%
0.010%
0.002%
0.066%
0.061%
0.000%
0.000%
6.203%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.322%
0.000%
0.034%
0.000%
0.000%
0.017%
0.098%
GW
0.000%
0.000%
0.000%
0.230%
0.276%
0.699%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.014%
0.000%
0.000%
0.000%
0.802%
0.295%
0.541%
0.025%
0.005%
0.078%
0.211%
0.000%
0.000%
16.795%
0.000%
0.000%
0.000%
0.000%
0.000%
0.008%
0.486%
0.000%
0.074%
0.000%
0.000%
0.060%
0.144%
SW
0.000%
0.000%
0.000%
0.000%
0.445%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.070%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A54d. Selenium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.025 mg/L
Total
0
0
1
8
47
19
4
0
2
1
0
3
3
4
2
0
0
13
0
4
0
0
5
11
4
34
2
2
13
3
2
7
7
0
0
1
1
0
61
8
0
2
4
0
2
280
GW
0
0
1
6
39
17
4
0
2
1
0
3
3
4
2
0
0
7
0
3
0
0
5
10
3
34
2
1
13
3
2
7
6
0
0
1
1
0
56
8
0
2
4
0
2
252
SW
0
0
0
2
8
2
0
0
0
0
0
0
0
0
0
0
0
6
0
1
0
0
0
1
1
0
0
1
0
0
0
0
1
0
0
0
0
0
5
0
0
0
0
0
0
28
Percent of Systems
with At Least One Detection
> 0.025 mg/L
Total
0.000%
0.000%
0.221%
0.762%
1.233%
2.267%
0.342%
0.000%
0.150%
0.063%
0.000%
0.311%
0.336%
0.268%
0.123%
0.000%
0.000%
1.252%
0.000%
0.134%
0.000%
0.000%
0.591%
0.482%
1.843%
4.651%
0.164%
0.146%
1.796%
0.926%
0.127%
0.365%
3.465%
0.000%
0.000%
0.122%
0.426%
0.000%
1.248%
1.578%
0.000%
0.334%
0.219%
0.000%
0.658%
0.572%
GW
0.000%
0.000%
0.262%
0.599%
1.186%
2.755%
0.354%
0.000%
0.153%
0.068%
0.000%
0.322%
0.354%
0.288%
0.127%
0.000%
0.000%
0.722%
0.000%
0.102%
0.000%
0.000%
0.635%
0.466%
1.579%
4.722%
0.170%
0.075%
1.898%
0.987%
0.150%
0.391%
3.429%
0.000%
0.000%
0.132%
0.446%
0.000%
1.232%
1.751%
0.000%
0.359%
0.222%
0.000%
0.784%
0.561%
SW
0.000%
0.000%
0.000%
4.167%
1.530%
0.905%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
8.824%
0.000%
1.923%
0.000%
0.000%
0.000%
0.719%
3.704%
0.000%
0.000%
2.703%
0.000%
0.000%
0.000%
0.000%
3.704%
0.000%
0.000%
0.000%
0.000%
0.000%
1.466%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.700%
Population Served by Systems
with At Least One Detection
> 0.025 mg/L
Total
0
0
37
318,655
1,029,063
13,363
289
0
106
120
0
3,218
465
24,434
13,134
0
0
1,894,473
0
297,792
0
0
380
24,225
6,592
39,415
98
676,399
14,256
1,353
2,000
1,371
176,806
0
0
200
33
0
196,331
48,401
0
293
1,605
0
142
4,785,049
GW
0
0
37
18,655
438,560
13,003
289
0
106
120
0
3,218
465
24,434
13,134
0
0
9,666
0
438
0
0
380
17,725
2,076
39,415
98
145
14,256
1,353
2,000
1,371
51,375
0
0
200
33
0
47,447
48,401
0
293
1,605
0
142
750,440
SW
0
0
0
300,000
590,503
360
0
0
0
0
0
0
0
0
0
0
0
1,884,807
0
297,354
0
0
0
6,500
4,516
0
0
676,254
0
0
0
0
125,431
0
0
0
0
0
148,884
0
0
0
0
0
0
4,034,609
Percent of Population Served
with At Least One Detection
> 0.025 mg/L
Total
0.000%
0.000%
0.002%
5.171%
2.839%
0.267%
0.011%
0.000%
0.001%
0.002%
0.000%
0.129%
0.044%
0.267%
0.264%
0.000%
0.000%
37.720%
0.000%
4.457%
0.000%
0.000%
0.050%
0.347%
1.171%
2.720%
0.010%
8.714%
0.855%
0.139%
0.018%
0.013%
23.597%
0.000%
0.000%
0.006%
0.010%
0.000%
0.783%
1.903%
0.000%
0.060%
0.040%
0.000%
0.032%
2.082%
GW
0.000%
0.000%
0.004%
0.668%
3.270%
2.438%
0.076%
0.000%
0.001%
0.009%
0.000%
0.231%
0.058%
0.823%
0.501%
0.000%
0.000%
0.944%
0.000%
0.023%
0.000%
0.000%
0.104%
1.038%
0.805%
5.858%
0.025%
0.005%
1.018%
0.482%
0.164%
0.044%
18.566%
0.000%
0.000%
0.025%
0.014%
0.000%
0.512%
2.871%
0.000%
0.129%
0.068%
0.000%
0.110%
0.878%
SW
0.000%
0.000%
0.000%
8.901%
2.587%
0.008%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
47.142%
0.000%
6.205%
0.000%
0.000%
0.000%
0.123%
1.480%
0.000%
0.000%
13.429%
0.000%
0.000%
0.000%
0.000%
26.543%
0.000%
0.000%
0.000%
0.000%
0.000%
0.943%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.794%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table ASS. Simazine — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 4 ug/L
> 2 ug/L
> 4 ug/L
> 2 ug/L
> 4 ug/L
> 2 ug/L
Total # Systems
Reporting
33,478
33,478
3,352
3,352
36,830
36,830
# Systems Exceeding
Threshold of Interest
4
5
12
29
16
34
% Systems Exceeding
Threshold of Interest
0.012%
0.015%
0.358%
0.865%
0.043%
0.092%
Total Pop. Served by
Systems Reporting
73,412,761
73,412,761
123,573,744
123,573,744
196,986,505
196,986,505
Total Pop. Served by
Systems Exceeding
Threshold of Interest
2,408
3,108
120,751
725,922
123,159
729,030
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.003%
0.004%
0.098%
0.587%
0.063%
0.370%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A55a. Simazine — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
51
567
1,658
7,021
23,217
2,486
1,316
1,266
2,398
1,477
2,101
1,739
2,621
4,178
2,448
1,873
3,020
2,820
456
6,923
4,761
9,521
3,018
13,271
407
4,478
4,193
195
4,525
1,606
2,925
7,557
2,057
926
2,906
960
214
11,075
7,084
504
1,315
3,190
650
1,282
158,256
GW
15
411
1,412
5,446
14,840
1,813
1,003
1,221
2,328
1,396
2,004
1,603
2,337
3,175
2,202
436
2,235
1,732
391
6,423
4,620
5,075
2,710
12,108
341
4,130
3,874
176
4,262
1,174
2,187
4,178
1,573
633
2,516
851
42
5,282
5,903
178
1,113
3,097
338
971
119,755
SW
36
156
246
1,575
8,377
673
313
45
70
81
97
136
284
1,003
246
1,437
785
1,088
65
500
141
4,446
308
1,163
66
348
319
19
263
432
738
3,379
484
293
390
109
172
5,793
1,181
326
202
93
312
311
38,501
Percent of Samples
with Detections
Total
0.000%
0.882%
0.121%
0.114%
0.134%
0.322%
0.000%
0.000%
0.459%
0.135%
0.095%
0.115%
0.000%
1.915%
1.511%
5.392%
0.099%
2.270%
0.000%
0.058%
0.000%
0.357%
0.000%
0.377%
0.000%
0.246%
0.000%
0.513%
0.022%
0.000%
0.034%
6.352%
0.000%
3.672%
0.000%
0.000%
0.935%
1.309%
0.014%
0.000%
0.152%
0.251%
2.000%
0.000%
0.722%
GW
0.000%
0.000%
0.000%
0.147%
0.020%
0.165%
0.000%
0.000%
0.473%
0.000%
0.100%
0.062%
0.000%
0.000%
0.045%
0.000%
0.045%
0.520%
0.000%
0.000%
0.000%
0.611%
0.000%
0.140%
0.000%
0.048%
0.000%
0.568%
0.023%
0.000%
0.000%
0.239%
0.000%
0.474%
0.000%
0.000%
2.381%
0.076%
0.017%
0.000%
0.090%
0.258%
2.367%
0.000%
0.106%
SW
0.000%
3.205%
0.813%
0.000%
0.334%
0.743%
0.000%
0.000%
0.000%
2.469%
0.000%
0.735%
0.000%
7.976%
14.634%
7.029%
0.255%
5.055%
0.000%
0.800%
0.000%
0.067%
0.000%
2.837%
0.000%
2.586%
0.000%
0.000%
0.000%
0.000%
0.136%
13.909%
0.000%
10.580%
0.000%
0.000%
0.581%
2.434%
0.000%
0.000%
0.495%
0.000%
1.603%
0.000%
2.639%
Minimum Detect
Concentration (u.g/L)
Total
0.08
0.03
0.09
0.02
3.9
0.01
8
0.08
0.29
0.4
0.08
0.02
0.07
0.01
0.2
0.5
0.07
0.1
0.12
4.16
0.04
0.05
0.1
0.07
0.1
0.3
0.07
0.07
0.03
0.01
GW
0.09
0.21
3.9
0.01
0.08
0.3
0.75
0.13
0.3
0.5
0.07
0.1
0.12
4.16
0.05
0.15
1.7
0.14
0.3
0.07
0.07
0.03
0.01
SW
0.08
0.03
0.02
5.6
8
0.29
0.4
0.08
0.02
0.07
0.01
0.2
0.62
0.07
0.11
0.04
0.05
0.1
0.07
0.1
0.17
0.03
0.01
Median Detect
Concentration (u.g/L)
Total
0.19
0.04
0.13
0.17
5.95
0.01
8
0.085
0.295
0.815
0.34
0.27
0.07
0.215
0.25
1.025
0.235
0.16
0.12
4.16
0.04
0.27
0.15
0.885
0.24
0.3
0.12
0.115
0.05
0.27
GW
0.13
0.28
5.7
0.01
0.085
0.3
0.75
0.13
1.3
1.42
0.28
0.105
0.12
4.16
0.095
0.15
1.7
0.205
0.3
0.07
0.115
0.04
0.3
SW
0.19
0.04
0.135
6.3
8
0.29
0.815
0.3
0.27
0.07
0.2
0.25
0.77
0.21
0.17
0.04
0.27
0.15
0.07
0.24
0.17
0.07
0.26
90th Percentile Detect
Concentration (u.g/L)
Total
0.22
0.05
0.7
3.18
11
0.01
8
0.09
0.3
2.4
1
0.93
0.13
1.1
0.3
2.7
0.785
0.24
0.12
4.16
0.04
0.86
0.51
1.7
0.48
0.3
0.17
0.27
0.5
1.1
GW
0.7
1.3
6.2
0.01
0.09
0.3
0.75
0.13
1.4
2.7
1.23
0.11
0.12
4.16
0.63
0.21
1.7
0.3
0.3
0.07
0.27
0.5
2.46
SW
0.22
0.05
3.18
11
8
0.29
2.4
1
0.93
0.07
0.8
0.3
1
0.56
0.25
0.04
0.87
0.51
0.07
0.48
0.17
0.5
1
Maximum Detect
Concentration (u.g/L)
Total
0.22
0.05
0.7
3.18
11
0.24
8
0.09
0.3
7.8
3.9
7.2
0.13
3.2
0.3
4.52
4.82
0.25
0.12
4.16
0.04
12.4
0.89
1.7
1.66
0.3
0.17
0.27
0.5
12.4
GW
0.7
1.3
6.2
0.24
0.09
0.3
0.75
0.13
1.4
4.52
1.68
0.11
0.12
4.16
0.78
0.21
1.7
0.3
0.3
0.07
0.27
0.5
6.2
SW
0.22
0.05
3.18
11
8
0.29
7.8
3.9
7.2
0.07
3.2
0.3
1
4.82
0.25
0.04
12.4
0.89
0.07
1.66
0.17
0.5
12.4
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A55b. Simazine — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
12
179
454
933
2,409
805
654
247
1,317
294
112
1,056
879
1,160
1,405
243
644
861
269
2,934
1,287
1,474
813
2,365
206
762
1,237
131
695
295
1,343
1,939
1,084
105
770
261
86
2,002
425
182
442
1,413
342
304
36,830
GW
7
132
382
885
2,030
586
617
244
1,295
280
100
1,023
825
1,058
1,361
93
527
793
241
2,873
1,258
1,397
753
2,228
179
751
1,196
119
659
274
1,113
1,814
934
97
711
240
25
1,665
388
71
409
1,393
196
256
33,478
SW
5
47
72
48
379
219
37
3
22
14
12
33
54
102
44
150
117
68
28
61
29
77
60
137
27
11
41
12
36
21
230
125
150
8
59
21
61
337
37
111
33
20
146
48
3,352
Total Population Served by Systems
Reporting
Total
245,571
2,794,595
2,453,348
6,077,602
34,891,367
4,990,326
2,589,153
647,226
16,794,353
974,583
1,305,882
2,543,237
1,074,009
9,113,191
4,872,043
4,612,320
8,485,298
4,906,042
510,420
7,227,105
3,934,332
3,282,439
753,259
6,885,177
555,446
1,455,834
945,754
2,002,039
1,661,712
961,667
4,923,387
10,227,103
2,937,354
902,560
3,427,270
622,272
1,856,148
21,523,196
2,500,321
2,391,215
432,954
3,884,401
1,366,817
446,177
196,986,505
GW
13,636
634,014
910,322
2,707,011
12,961,658
523,417
261,886
365,826
14,552,348
282,561
1,251,254
1,434,611
827,601
2,914,019
2,552,307
375,460
1,682,916
907,935
134,500
2,047,249
2,684,691
1,701,108
360,590
1,733,551
250,221
679,354
395,955
354,819
1,398,814
271,776
981,697
3,132,166
572,604
163,122
800,487
263,101
161,124
5,759,696
1,667,135
30,317
181,790
2,192,657
206,226
129,229
73,412,761
SW
231,935
2,160,581
1,543,026
3,370,591
21,929,709
4,466,909
2,327,267
281,400
2,242,005
692,022
54,628
1,108,626
246,408
6,199,172
2,319,736
4,236,860
6,802,382
3,998,107
375,920
5,179,856
1,249,641
1,581,331
392,669
5,151,626
305,225
776,480
549,799
1,647,220
262,898
689,891
3,941,690
7,094,937
2,364,750
739,438
2,626,783
359,171
1,695,024
15,763,500
833,186
2,360,898
251,164
1,691,744
1,160,591
316,948
123,573,744
Percent of Systems
with At Least One Detection
Total
0.000%
2.235%
0.441%
0.750%
0.706%
0.994%
0.000%
0.000%
0.380%
0.340%
0.893%
0.189%
0.000%
2.069%
0.712%
9.465%
0.311%
2.439%
0.000%
0.068%
0.000%
0.204%
0.000%
0.973%
0.000%
0.525%
0.000%
0.763%
0.144%
0.000%
0.074%
2.940%
0.000%
2.857%
0.000%
0.000%
2.326%
1.149%
0.235%
0.000%
0.452%
0.425%
3.216%
0.000%
0.725%
GW
0.000%
0.000%
0.000%
0.791%
0.148%
0.512%
0.000%
0.000%
0.386%
0.000%
1.000%
0.098%
0.000%
0.000%
0.073%
0.000%
0.190%
1.135%
0.000%
0.000%
0.000%
0.072%
0.000%
0.269%
0.000%
0.266%
0.000%
0.840%
0.152%
0.000%
0.000%
0.496%
0.000%
2.062%
0.000%
0.000%
4.000%
0.240%
0.258%
0.000%
0.244%
0.431%
4.082%
0.000%
0.221%
SW
0.000%
8.511%
2.778%
0.000%
3.694%
2.283%
0.000%
0.000%
0.000%
7.143%
0.000%
3.030%
0.000%
23.529%
20.455%
15.333%
0.855%
17.647%
0.000%
3.279%
0.000%
2.597%
0.000%
12.409%
0.000%
18.182%
0.000%
0.000%
0.000%
0.000%
0.435%
38.400%
0.000%
12.500%
0.000%
0.000%
1.639%
5.638%
0.000%
0.000%
3.030%
0.000%
2.055%
0.000%
5.758%
Percent of Population Served
with At Least One Detection
Total
0.000%
3.714%
0.804%
0.043%
2.342%
0.337%
0.000%
0.000%
15.506%
0.274%
0.107%
2.157%
0.000%
4.876%
11.888%
14.736%
0.799%
74.354%
0.000%
0.322%
0.000%
1.188%
0.000%
25.074%
0.000%
36.986%
0.000%
0.029%
0.006%
0.000%
0.393%
25.566%
0.000%
7.714%
0.000%
0.000%
2.213%
31.658%
0.001%
0.000%
0.092%
0.569%
0.819%
0.000%
10.641%
GW
0.000%
0.000%
0.000%
0.097%
0.256%
0.528%
0.000%
0.000%
17.895%
0.000%
0.112%
0.122%
0.000%
0.000%
0.002%
0.000%
1.430%
0.378%
0.000%
0.000%
0.000%
0.015%
0.000%
1.553%
0.000%
3.705%
0.000%
0.166%
0.007%
0.000%
0.000%
1.608%
0.000%
0.835%
0.000%
0.000%
0.053%
0.653%
0.001%
0.000%
0.169%
1.008%
0.828%
0.000%
3.869%
SW
0.000%
4.803%
1.279%
0.000%
3.575%
0.315%
0.000%
0.000%
0.000%
0.386%
0.000%
4.789%
0.000%
7.168%
24.965%
16.042%
0.643%
91.154%
0.000%
0.449%
0.000%
2.450%
0.000%
32.989%
0.000%
66.103%
0.000%
0.000%
0.000%
0.000%
0.491%
36.142%
0.000%
9.232%
0.000%
0.000%
2.418%
42.986%
0.000%
0.000%
0.036%
0.000%
0.818%
0.000%
14.665%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A55c. Simazine — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>4 u.g/L
Total
0
0
0
0
0
7
0
0
0
1
0
0
0
2
0
2
0
0
0
0
0
1
0
1
0
0
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
16
GW
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4
sw
0
0
0
0
0
5
0
0
0
1
0
0
0
2
0
2
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
12
Percent of Systems
with At Least One Detection
> 4 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.870%
0.000%
0.000%
0.000%
0.340%
0.000%
0.000%
0.000%
0.172%
0.000%
0.823%
0.000%
0.000%
0.000%
0.000%
0.000%
0.068%
0.000%
0.042%
0.000%
0.000%
0.000%
0.000%
0.144%
0.000%
0.000%
0.052%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.043%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.341%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.152%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.012%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
2.283%
0.000%
0.000%
0.000%
7.143%
0.000%
0.000%
0.000%
1.961%
0.000%
1.333%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.730%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.800%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.358%
Population Served by Systems
with At Least One Detection
>4 u.g/L
Total
0
0
0
0
0
16,129
0
0
0
2,671
0
0
0
7,529
0
3,409
0
0
0
0
0
250
0
72,480
0
0
0
0
92
0
0
20,599
0
0
0
0
0
0
0
0
0
0
0
0
123,159
GW
0
0
0
0
0
2,066
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
250
0
0
0
0
0
0
92
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2,408
SW
0
0
0
0
0
14,063
0
0
0
2,671
0
0
0
7,529
0
3,409
0
0
0
0
0
0
0
72,480
0
0
0
0
0
0
0
20,599
0
0
0
0
0
0
0
0
0
0
0
0
120,751
Percent of Population Served
with At Least One Detection
>4 u.g/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.323%
0.000%
0.000%
0.000%
0.274%
0.000%
0.000%
0.000%
0.083%
0.000%
0.074%
0.000%
0.000%
0.000%
0.000%
0.000%
0.008%
0.000%
1.053%
0.000%
0.000%
0.000%
0.000%
0.006%
0.000%
0.000%
0.201%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.063%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.395%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.015%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.315%
0.000%
0.000%
0.000%
0.386%
0.000%
0.000%
0.000%
0.121%
0.000%
0.080%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.407%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.290%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.098%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A55d. Simazine — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2 ug/L
Total
0
0
0
0
8
8
0
0
0
1
0
0
0
5
1
3
0
1
0
0
0
1
0
1
0
0
0
0
1
0
0
4
0
0
0
0
0
0
0
0
0
0
0
0
34
GW
0
0
0
0
0
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5
sw
0
0
0
0
8
5
0
0
0
1
0
0
0
5
1
3
0
1
0
0
0
0
0
1
0
0
0
0
0
0
0
4
0
0
0
0
0
0
0
0
0
0
0
0
29
Percent of Systems
with At Least One Detection
> 2 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.332%
0.994%
0.000%
0.000%
0.000%
0.340%
0.000%
0.000%
0.000%
0.431%
0.071%
1.235%
0.000%
0.116%
0.000%
0.000%
0.000%
0.068%
0.000%
0.042%
0.000%
0.000%
0.000%
0.000%
0.144%
0.000%
0.000%
0.206%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.092%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.512%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.152%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.015%
sw
0.000%
0.000%
0.000%
0.000%
2.111%
2.283%
0.000%
0.000%
0.000%
7.143%
0.000%
0.000%
0.000%
4.902%
2.273%
2.000%
0.000%
1.471%
0.000%
0.000%
0.000%
0.000%
0.000%
0.730%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.200%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.865%
Population Served by Systems
with At Least One Detection
> 2 ug/L
Total
0
0
0
0
487,920
16,829
0
0
0
2,671
0
0
0
29,291
1,350
53,630
0
8,453
0
0
0
250
0
72,480
0
0
0
0
92
0
0
56,064
0
0
0
0
0
0
0
0
0
0
0
0
729,030
GW
0
0
0
0
0
2,766
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
250
0
0
0
0
0
0
92
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3,108
SW
0
0
0
0
487,920
14,063
0
0
0
2,671
0
0
0
29,291
1,350
53,630
0
8,453
0
0
0
0
0
72,480
0
0
0
0
0
0
0
56,064
0
0
0
0
0
0
0
0
0
0
0
0
725,922
Percent of Population Served
with At Least One Detection
> 2 ug/L
Total
0.000%
0.000%
0.000%
0.000%
1.398%
0.337%
0.000%
0.000%
0.000%
0.274%
0.000%
0.000%
0.000%
0.321%
0.028%
1.163%
0.000%
0.172%
0.000%
0.000%
0.000%
0.008%
0.000%
1.053%
0.000%
0.000%
0.000%
0.000%
0.006%
0.000%
0.000%
0.548%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.370%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.528%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.015%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
sw
0.000%
0.000%
0.000%
0.000%
2.225%
0.315%
0.000%
0.000%
0.000%
0.386%
0.000%
0.000%
0.000%
0.472%
0.058%
1.266%
0.000%
0.211%
0.000%
0.000%
0.000%
0.000%
0.000%
1.407%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.790%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.587%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A56. Styrene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 100 ug/L
> 50 ug/L
> 100 ug/L
> 50 ug/L
> 100 ug/L
> 50 ug/L
Total # Systems
Reporting
46,165
46,165
4,256
4,256
50,421
50,421
# Systems Exceeding
Threshold of Interest
4
7
0
0
4
7
% Systems Exceeding
Threshold of Interest
0.009%
0.015%
0.000%
0.000%
0.008%
0.014%
Total Pop. Served by
Systems Reporting
86,392,838
86,392,838
140,540,798
140,540,798
226,933,636
226,933,636
Total Pop. Served by
Systems Exceeding
Threshold of Interest
1,310
1,651
0
0
1,310
1,651
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.002%
0.002%
0.000%
0.000%
0.001%
0.001%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A56a. Styrene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,116
821
2,393
11,698
85,452
2,864
6,938
1,048
4,146
7,175
1,789
1,788
3,741
7,012
4,623
3,306
16,249
6,770
3,689
10,753
8,593
7,543
4,490
19,061
552
6,838
9,583
20,347
6,573
3,207
7,097
8,856
5,356
2,324
1,959
4,207
889
2,936
34,145
8,970
4,930
4,349
11,294
1,140
1,659
372,269
GW
1,977
597
1,926
9,531
45,203
2,125
6,047
1,018
4,078
6,348
1,686
1,662
3,280
6,452
4,313
1,123
12,259
5,510
3,374
9,743
7,339
6,694
3,951
17,483
417
6,262
9,105
18,561
6,097
2,575
5,427
7,695
3,959
1,682
1,591
3,725
855
1,163
27,041
7,549
4,058
3,955
11,169
444
1,156
288,205
SW
1,139
224
467
2,167
40,249
739
891
30
68
827
103
126
461
560
310
2,183
3,990
1,260
315
1,010
1,254
849
539
1,578
135
576
478
1,786
476
632
1,670
1,161
1,397
642
368
482
34
1,773
7,104
1,421
872
394
125
696
503
84,064
Percent of Samples
with Detections
Total
0.289%
0.244%
0.125%
0.060%
0.037%
0.908%
0.043%
0.382%
0.362%
0.014%
0.000%
0.951%
0.080%
0.157%
1.363%
0.514%
0.062%
0.369%
0.434%
0.335%
1.082%
0.013%
0.000%
0.310%
0.906%
0.000%
0.083%
0.147%
0.015%
0.094%
0.127%
0.576%
0.504%
0.000%
0.051%
0.024%
0.225%
0.034%
0.082%
0.045%
1.075%
0.092%
0.832%
1.228%
0.060%
0.212%
GW
0.152%
0.335%
0.156%
0.042%
0.040%
1.176%
0.050%
0.393%
0.368%
0.016%
0.000%
0.963%
0.091%
0.170%
1.461%
0.000%
0.082%
0.454%
0.474%
0.349%
1.022%
0.015%
0.000%
0.326%
0.719%
0.000%
0.088%
0.162%
0.016%
0.078%
0.111%
0.650%
0.505%
0.000%
0.000%
0.027%
0.234%
0.000%
0.085%
0.053%
1.207%
0.101%
0.842%
2.477%
0.087%
0.242%
SW
0.527%
0.000%
0.000%
0.138%
0.035%
0.135%
0.000%
0.000%
0.000%
0.000%
0.000%
0.794%
0.000%
0.000%
0.000%
0.779%
0.000%
0.000%
0.000%
0.198%
1.435%
0.000%
0.000%
0.127%
1.481%
0.000%
0.000%
0.000%
0.000%
0.158%
0.180%
0.086%
0.501%
0.000%
0.272%
0.000%
0.000%
0.056%
0.070%
0.000%
0.459%
0.000%
0.000%
0.431%
0.000%
0.109%
Minimum Detect
Concentration (u.g/L)
Total
0.2
0.53
0.14
0.5
0.5
0.04
0.5
0.95
0.08
0.85
0.3
0.5
0.5
0.5
0.002
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.54
0.5
0.2
0.3
0.2
0.5
0.55
0.4
0.7
0.73
0.24
1.2
0.5
0.9
0.5
0.6
0.02
0.11
0.76
0.002
GW
0.2
0.53
0.14
0.6
0.6
0.04
0.5
0.95
0.08
0.85
0.3
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.58
0.5
0.2
0.3
0.2
0.5
0.55
0.4
0.73
0.24
0.5
0.9
0.5
0.6
0.02
0.11
0.76
0.02
SW
0.23
0.5
0.5
0.3
0.9
0.002
0.6
0.5
0.68
0.54
0.55
0.5
1.1
0.5
0.7
1.2
0.5
0.6
0.5
0.002
Median Detect
Concentration (u.g/L)
Total
0.54
5.215
0.15
0.6
0.88
0.9
1.2
1.285
0.22
0.85
1.4
6.4
0.6
2
0.2
0.665
0.5
2.6
0.8
2.2
0.5
1.3
0.58
1.4
0.79
0.3
0.55
0.5
1.63
0.98
0.7
0.73
0.425
1.2
0.6
1.15
0.9
0.75
0.57
0.5
0.76
0.885
GW
0.27
5.215
0.15
0.65
1.15
0.9
1.2
1.285
0.22
0.85
8.2
6.4
0.6
2
0.665
0.5
2.6
0.8
2.5
0.5
1.3
0.66
1.4
0.79
0.3
1.25
0.55
1.635
1.165
0.73
0.425
0.6
1.15
0.9
0.75
0.57
0.5
0.76
0.9
SW
0.875
0.5
0.75
0.3
0.9
0.2
1.05
0.95
1.64
0.56
0.55
0.5
1.1
0.6
0.7
1.2
0.6
1.05
0.5
0.69
90th Percentile Detect
Concentration (u.g/L)
Total
1.98
9.9
0.64
0.7
5.6
2
1.8
2.76
0.34
0.85
31
500
13.2
8.7
0.5
4.25
9.4
14
3
20
0.5
8.18
1.86
10
10.835
0.3
2.3
9
9.87
11.4
0.7
0.73
0.61
1.2
2.1
1.8
1.8
0.97
5.2
0.5
0.76
7.5
GW
0.54
9.9
0.64
0.7
6
2
1.8
2.76
0.34
0.85
31
500
13.2
8.7
4.25
9.4
14
3
21
0.5
8.18
1.86
10
10.835
0.3
2.3
9
10.935
6.81
0.73
0.61
2.1
1.8
1.8
0.97
5.2
0.5
0.76
8.1
SW
1.98
0.5
5.6
0.3
0.9
0.5
1.5
3.5
2.6
0.58
0.55
1.3
1.1
18.8
0.7
1.2
1.2
2
1
2.6
Maximum Detect
Concentration (u.g/L)
Total
1.98
9.9
0.64
0.7
7.7
3.9
1.8
2.76
0.5
0.85
33
500
710
24
1
7.4
21.6
18.9
10.7
96
0.5
66.1
1.86
10
235
0.3
2.3
9
108
18.8
0.7
0.73
0.61
1.2
59
1.8
4.3
0.97
44
1
0.76
710
GW
0.54
9.9
0.64
0.7
7.7
3.9
1.8
2.76
0.5
0.85
33
500
710
24
7.4
21.6
18.9
10.7
96
0.5
66.1
1.86
10
235
0.3
2.3
9
108
11.4
0.73
0.61
59
1.8
4.3
0.97
44
0.5
0.76
710
SW
1.98
0.5
5.6
0.3
0.9
1
1.5
9
2.6
0.58
0.55
1.3
1.1
18.8
0.7
1.2
1.2
2
1
18.8
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A56b. Styrene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
263
454
1,059
3,643
826
1,207
318
1,511
1,822
106
1,056
935
1,429
1,473
241
718
1,054
810
2,972
1,582
1,417
848
2,367
210
771
1,258
1,398
727
338
1,524
1,944
718
1,097
145
819
245
351
4,951
500
1,600
603
1,784
403
304
50,421
GW
474
202
382
1,011
3,127
605
1,168
315
1,485
1,706
94
1,023
878
1,325
1,429
92
600
986
757
2,911
1,552
1,340
788
2,228
183
760
1,217
1,361
688
317
1,288
1,819
506
945
136
757
233
162
4,609
454
1,429
560
1,764
243
256
46,165
SW
146
61
72
48
516
221
39
3
26
116
12
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
171
43
20
160
48
4,256
Total Population Served by Systems
Reporting
Total
606,193
4,218,278
2,453,348
6,166,873
35,826,547
4,997,841
2,723,376
698,987
17,499,068
7,485,298
1,293,745
2,543,141
1,093,666
9,217,431
4,891,163
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,748,495
1,698,980
973,592
4,893,449
10,227,597
3,119,686
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,273,258
491,035
4,039,526
1,416,020
446,177
226,933,636
GW
232,590
1,123,190
910,322
2,796,282
13,514,486
530,207
389,454
417,587
15,253,026
1,592,517
1,239,117
1,434,515
837,604
3,017,034
2,571,427
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,712,549
1,432,432
283,701
1,042,847
3,132,660
660,832
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
630,675
227,067
2,347,782
237,670
129,229
86,392,838
SW
373,603
3,095,088
1,543,026
3,370,591
22,312,061
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,642,583
263,968
1,691,744
1,178,350
316,948
140,540,798
Percent of Systems
with At Least One Detection
Total
0.968%
0.760%
0.661%
0.378%
0.549%
2.785%
0.249%
0.314%
0.794%
0.055%
0.000%
0.852%
0.321%
0.630%
1.969%
4.564%
0.975%
1.328%
0.741%
1.009%
3.161%
0.071%
0.000%
1.817%
2.381%
0.000%
0.477%
1.288%
0.138%
0.888%
0.525%
1.492%
3.621%
0.000%
0.690%
0.122%
0.816%
0.285%
0.444%
0.600%
2.500%
0.663%
3.139%
3.474%
0.329%
1.047%
GW
0.422%
0.990%
0.785%
0.297%
0.384%
3.636%
0.257%
0.317%
0.808%
0.059%
0.000%
0.782%
0.342%
0.679%
2.029%
0.000%
1.167%
1.420%
0.793%
0.962%
2.448%
0.075%
0.000%
1.840%
1.639%
0.000%
0.493%
1.323%
0.145%
0.631%
0.388%
1.539%
3.755%
0.000%
0.000%
0.132%
0.858%
0.000%
0.456%
0.661%
2.589%
0.714%
3.175%
4.527%
0.391%
1.003%
SW
2.740%
0.000%
0.000%
2.083%
1.550%
0.452%
0.000%
0.000%
0.000%
0.000%
0.000%
3.030%
0.000%
0.000%
0.000%
7.383%
0.000%
0.000%
0.000%
3.279%
40.000%
0.000%
0.000%
1.439%
7.407%
0.000%
0.000%
0.000%
0.000%
4.762%
1.271%
0.800%
3.302%
0.000%
11.111%
0.000%
0.000%
0.529%
0.292%
0.000%
1.754%
0.000%
0.000%
1.875%
0.000%
1.527%
Percent of Population Served
with At Least One Detection
Total
1.634%
0.286%
0.073%
5.287%
3.714%
1.189%
0.018%
0.030%
1.003%
0.001%
0.000%
0.329%
0.014%
0.188%
0.502%
10.587%
0.034%
0.493%
0.160%
0.705%
20.831%
0.043%
0.000%
1.424%
0.891%
0.000%
2.096%
0.048%
0.012%
35.542%
0.107%
0.096%
2.712%
0.000%
5.553%
0.001%
0.077%
0.026%
5.163%
4.168%
1.356%
0.063%
3.254%
2.193%
0.016%
2.506%
GW
0.071%
1.073%
0.196%
0.932%
3.175%
1.463%
0.129%
0.050%
1.151%
0.005%
0.000%
0.314%
0.018%
0.575%
0.954%
0.000%
0.166%
2.417%
0.399%
0.950%
6.020%
0.077%
0.000%
2.355%
0.407%
0.000%
4.983%
0.138%
0.015%
4.110%
0.424%
0.220%
9.542%
0.000%
0.000%
0.006%
0.106%
0.000%
13.847%
6.264%
2.261%
0.135%
5.599%
1.018%
0.056%
3.038%
SW
2.607%
0.000%
0.000%
8.901%
4.041%
1.157%
0.000%
0.000%
0.000%
0.000%
0.000%
0.348%
0.000%
0.000%
0.000%
11.527%
0.000%
0.000%
0.000%
0.611%
56.515%
0.000%
0.000%
1.118%
1.299%
0.000%
0.000%
0.000%
0.000%
48.467%
0.021%
0.041%
0.877%
0.000%
6.858%
0.000%
0.000%
0.035%
0.058%
0.000%
1.233%
0.000%
0.000%
2.430%
0.000%
2.179%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A56c. Styrene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 100 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
4
GW
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
4
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 100 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.107%
0.070%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.051%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.008%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.114%
0.075%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.073%
0.000%
0.000%
0.000%
0.055%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.009%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 100 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
60
200
0
0
0
0
0
0
0
0
0
0
0
0
0
400
0
0
0
650
0
0
0
0
0
0
0
0
0
0
0
0
0
1,310
GW
0
0
0
0
0
0
0
0
0
0
0
0
60
200
0
0
0
0
0
0
0
0
0
0
0
0
0
400
0
0
0
650
0
0
0
0
0
0
0
0
0
0
0
0
0
1,310
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 100 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.005%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.005%
0.000%
0.000%
0.000%
0.006%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
0.007%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.015%
0.000%
0.000%
0.000%
0.021%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A56d. Styrene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 50 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
1
0
0
1
0
0
0
1
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
7
GW
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
1
0
0
1
0
0
0
1
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
7
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 50 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.107%
0.070%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.063%
0.000%
0.000%
0.042%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.000%
0.051%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.020%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.014%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.114%
0.075%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.064%
0.000%
0.000%
0.045%
0.000%
0.000%
0.000%
0.073%
0.000%
0.000%
0.000%
0.055%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.022%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.015%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 50 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
60
200
0
0
0
0
0
0
25
0
0
40
0
0
0
400
0
0
0
650
0
0
0
0
0
0
276
0
0
0
0
0
0
1,651
GW
0
0
0
0
0
0
0
0
0
0
0
0
60
200
0
0
0
0
0
0
25
0
0
40
0
0
0
400
0
0
0
650
0
0
0
0
0
0
276
0
0
0
0
0
0
1,651
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 50 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.005%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.005%
0.000%
0.000%
0.000%
0.006%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
0.007%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.002%
0.000%
0.000%
0.000%
0.015%
0.000%
0.000%
0.000%
0.021%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A57. 2,3,7,8-TCDD (Dioxin) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration or
Threshold of
Interest
> 0.00003 ug/L
> 0.000015 ug/L
> 0.00003 ug/L
> 0.000015 ug/L
> 0.00003 ug/L
> 0.000015 ug/L
Total # Systems
Reporting
1,956
1,956
427
427
2,383
2,383
# Systems Exceeding
Threshold of Interest
1
2
0
1
1
3
% Systems Exceeding
Threshold of Interest
0.051%
0.102%
0.000%
0.234%
0.042%
0.126%
Total Pop. Served by
Systems Reporting
16,399,032
16,399,032
36,455,413
36,455,413
52,854,445
52,854,445
Total Pop. Served by
Systems Exceeding
Threshold of Interest
7,100
7,226
0
2,400
7,100
9,626
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.043%
0.044%
0.000%
0.007%
0.013%
0.018%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A57a. 2,3,7,8-TCDD (Dioxin — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
23
1
3,059
5,187
58
3
187
5
2
170
77
1
83
922
26
2
11
4
958
79
39
5
10
15
10
128
11
11,076
GW
12
0
2,073
2,558
48
3
146
5
2
55
5
0
4
832
7
1
11
2
553
12
21
2
2
8
9
69
5
6,445
SW
11
1
986
2,629
10
0
41
0
0
115
72
1
79
90
19
1
0
2
405
67
18
3
8
7
1
59
6
4,631
Percent of Samples
with Detections
Total
0.000%
100.000%
0.425%
0.058%
0.000%
0.000%
0.000%
0.000%
50.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.104%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.781%
0.000%
0.181%
GW
0.000%
0.000%
0.241%
0.078%
0.000%
0.000%
0.000%
0.000%
50.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.181%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.449%
0.000%
0.155%
SW
0.000%
100.000%
0.811%
0.038%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.216%
Minimum Detect
Concentration (u.g/L)
Total
0.00003
1E-06
3E-06
5E-06
2.5E-05
2E-06
1E-06
GW
3E-06
0.00001
5E-06
2.5E-05
2E-06
2E-06
SW
0.00003
1E-06
3E-06
1E-06
Median Detect
Concentration (u.g/L)
Total
0.00003
4E-06
0.00001
5E-06
2.5E-05
2E-06
5E-06
GW
5E-06
9.4E-05
5E-06
2.5E-05
2E-06
5E-06
SW
0.00003
3.5E-06
3E-06
3.5E-06
90th Percentile Detect
Concentration (u.g/L)
Total
0.00003
5E-06
0.00018
5E-06
2.5E-05
2E-06
2.8E-05
GW
0.00001
0.00018
5E-06
2.5E-05
2E-06
0.0001
SW
0.00003
5E-06
3E-06
1.8E-05
Maximum Detect
Concentration (u.g/L)
Total
0.00003
0.00001
0.00018
5E-06
2.5E-05
2E-06
0.00018
GW
0.00001
0.00018
5E-06
2.5E-05
2E-06
0.00018
SW
0.00003
5E-06
3E-06
0.00003
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A57b. 2,3,7,8-TCDD (Dioxin —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
6
1
598
595
35
2
104
4
2
86
29
1
7
605
12
2
6
3
146
17
20
3
5
6
10
71
7
2,383
GW
5
0
552
431
27
2
88
4
2
43
5
0
3
557
7
1
6
2
127
8
12
1
2
4
9
54
4
1,956
SW
1
1
46
164
8
0
16
0
0
43
24
1
4
48
5
1
0
1
19
9
8
2
3
2
1
17
3
427
Total Population Served by Systems
Reporting
Total
19,333
2,400
5,381,098
24,075,352
1,936,985
520
7,701,758
27,571
1,254
2,343,633
2,094,576
37,615
1,824,735
685,741
837,285
13,483
12,822
3,897
806,913
506,453
1,086,855
67,955
1,167,103
188,815
76,237
1,821,983
132,073
52,854,445
GW
13,461
0
2,011,562
7,031,578
61,912
520
5,634,110
27,571
1,254
26,697
27,456
0
68
309,762
69,714
11,700
12,822
3,347
126,427
18,987
69,630
75
721,882
31,155
7,314
179,333
695
16,399,032
SW
5,872
2,400
3,369,536
17,043,774
1,875,073
0
2,067,648
0
0
2,316,936
2,067,120
37,615
1,824,667
375,979
767,571
1,783
0
550
680,486
487,466
1,017,225
67,880
445,221
157,660
68,923
1,642,650
131,378
36,455,413
Percent of Systems
with At Least One Detection
Total
0.000%
100.000%
1.672%
0.504%
0.000%
0.000%
0.000%
0.000%
50.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.685%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.408%
0.000%
0.713%
GW
0.000%
0.000%
0.725%
0.464%
0.000%
0.000%
0.000%
0.000%
50.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.787%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.852%
0.000%
0.460%
SW
0.000%
100.000%
13.043%
0.610%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.874%
Percent of Population Served
with At Least One Detection
Total
0.000%
100.000%
5.280%
0.085%
0.000%
0.000%
0.000%
0.000%
20.175%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.016%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
0.000%
0.582%
GW
0.000%
0.000%
1.338%
0.101%
0.000%
0.000%
0.000%
0.000%
20.175%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.100%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.075%
0.000%
0.211%
SW
0.000%
100.000%
7.634%
0.078%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.749%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A57c. 2,3,7,8-TCDD (Dioxin — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Table A57c. 2,3,7,8-TCDD (Dioxin) -Summary of Stage 1 (Peak) Analyses of Any Detections > 0.00003 u.g/L (Single detections > 0.00003 u.g/L are not necessarily MCL violations
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.00003 ug/L
Total
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
GW
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 0.00003 ug/L
Total
0.000%
0.000%
0.000%
0.168%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.042%
GW
0.000%
0.000%
0.000%
0.232%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.051%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 0.00003 ug/L
Total
0
0
0
7,100
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7,100
GW
0
0
0
7,100
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7,100
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 0.00003 ug/L
Total
0.000%
0.000%
0.000%
0.029%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.013%
GW
0.000%
0.000%
0.000%
0.101%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.043%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A57d. 2,3,7,8-TCDD (Dioxin — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Table A57d. 2,3,7,8-TCDD (Dioxin) - Summary of Stage 1 (Peak) Analyses of Any Detections > 0.000015 u.g/L (Single detections > 0.000015 u.g/L are not necessarily MCL violatic
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.000015 ug/L
Total
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
3
GW
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
2
sw
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Percent of Systems
with At Least One Detection
> 0.000015 ug/L
Total
0.000%
100.000%
0.000%
0.168%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.685%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.126%
GW
0.000%
0.000%
0.000%
0.232%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.787%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.102%
sw
0.000%
100.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.234%
Population Served by Systems
with At Least One Detection
> 0.000015 ug/L
Total
0
2,400
0
7,100
0
0
0
0
0
0
0
0
0
0
0
0
0
0
126
0
0
0
0
0
0
0
0
9,626
GW
0
0
0
7,100
0
0
0
0
0
0
0
0
0
0
0
0
0
0
126
0
0
0
0
0
0
0
0
7,226
SW
0
2,400
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2,400
Percent of Population Served
with At Least One Detection
> 0.000015 ug/L
Total
0.000%
100.000%
0.000%
0.029%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.016%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.018%
GW
0.000%
0.000%
0.000%
0.101%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.100%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.044%
sw
0.000%
100.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A58. Tetrachloroethylene (PCE) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
Total # Systems
Reporting
46,180
46,180
46,180
46,180
4,256
4,256
4,256
4,256
50,436
50,436
50,436
50,436
# Systems Exceeding
Threshold of Interest
185
331
615
915
56
73
118
148
241
404
733
1,063
% Systems Exceeding
Threshold of Interest
0.401%
0.717%
1.332%
1.981%
1.316%
1.715%
2.773%
3.477%
0.478%
0.801%
1.453%
2.108%
Total Pop. Served by
Systems Reporting
86,396,173
86,396,173
86,396,173
86,396,173
140,612,382
140,612,382
140,612,382
140,612,382
227,008,555
227,008,555
227,008,555
227,008,555
Total Pop. Served by
Systems Exceeding
Threshold of Interest
3,823,729
6,157,866
10,479,911
12,472,505
10,814,217
11,524,206
15,318,905
17,083,237
14,637,946
17,682,072
25,798,816
29,555,742
% Pop. Served by
Systems Exceeding
Threshold of Interest
4.426%
7.127%
12.130%
14.436%
7.691%
8.196%
10.894%
12.149%
6.448%
7.789%
11.365%
13.020%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A58a. Tetrachloroethylene (PCE) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,128
1,092
2,393
12,720
117,322
2,895
6,983
1,050
4,152
7,174
1,789
1,923
3,794
7,054
4,625
3,315
19,988
6,776
3,689
10,752
8,592
7,543
4,496
19,066
558
6,837
9,587
20,347
6,574
3,270
7,094
8,850
5,634
2,334
1,959
4,344
889
2,939
34,158
8,989
4,893
4,343
11,299
1,173
1,660
410,042
GW
1,977
736
1,926
9,662
62,663
2,155
6,073
1,020
4,084
6,347
1,686
1,796
3,329
6,485
4,315
1,130
15,236
5,514
3,374
9,742
7,342
6,694
3,957
17,487
417
6,261
9,109
18,562
6,098
2,586
5,426
7,689
4,199
1,691
1,591
3,805
855
1,165
27,054
7,561
4,025
3,952
11,174
472
1,157
309,579
SW
1,151
356
467
3,058
54,659
740
910
30
68
827
103
127
465
569
310
2,185
4,752
1,262
315
1,010
1,250
849
539
1,579
141
576
478
1,785
476
684
1,668
1,161
1,435
643
368
539
34
1,774
7,104
1,428
868
391
125
701
503
100,463
Percent of Samples
with Detections
Total
0.863%
30.769%
1.421%
2.956%
21.784%
1.244%
5.385%
1.048%
7.948%
1.101%
0.000%
4.420%
4.692%
2.566%
1.016%
0.814%
14.599%
3.143%
0.623%
1.479%
1.734%
2.174%
0.601%
1.295%
2.867%
1.858%
0.970%
3.313%
2.784%
5.719%
3.496%
2.508%
0.728%
2.614%
2.450%
2.187%
1.800%
2.416%
0.632%
0.667%
1.655%
2.763%
5.638%
2.046%
0.723%
8.490%
GW
0.556%
22.962%
1.765%
3.353%
21.979%
1.578%
4.034%
0.882%
8.080%
1.197%
0.000%
4.621%
4.266%
2.791%
1.089%
1.416%
15.522%
3.845%
0.622%
1.632%
1.920%
2.435%
0.607%
1.407%
1.679%
2.028%
1.010%
3.356%
2.870%
0.889%
1.788%
2.874%
0.953%
3.548%
2.577%
2.392%
1.871%
1.459%
0.780%
0.661%
1.988%
3.036%
5.611%
4.025%
0.778%
6.961%
SW
1.390%
46.910%
0.000%
1.700%
21.559%
0.270%
14.396%
6.667%
0.000%
0.363%
0.000%
1.575%
7.742%
0.000%
0.000%
0.503%
11.637%
0.079%
0.635%
0.000%
0.640%
0.118%
0.557%
0.063%
6.383%
0.000%
0.209%
2.857%
1.681%
23.977%
9.053%
0.086%
0.070%
0.156%
1.902%
0.742%
0.000%
3.044%
0.070%
0.700%
0.115%
0.000%
8.000%
0.713%
0.596%
13.200%
Minimum Detect
Concentration (u.g/L)
Total
0.29
0.5
0.19
0.5
0.05
0.33
0.08
0.68
0.03
0.5
0.5
0.3
0.5
0.5
0.001
0.2
0.4
0.5
0.4
0.2
0.51
0.36
0.5
0.57
0.27
0.28
0.1
0.1
0.2
0.5
0.5
0.4
0.53
0.5
0.3
0.5
0.54
0.5
0.6
0.5
0.23
0.01
0.1
0.56
0.001
GW
0.29
0.5
0.19
0.5
0.05
0.33
0.08
0.68
0.03
0.5
0.5
0.3
0.5
0.5
0.4
0.2
0.4
0.5
0.4
0.2
0.51
0.36
0.5
0.57
0.27
0.28
0.13
0.1
0.5
0.5
0.5
0.4
0.53
0.5
0.3
0.5
0.6
0.5
0.7
0.5
0.23
0.01
0.1
0.56
0.01
SW
0.3
0.5
0.5
0.49
1
0.6
1.65
0.5
0.6
0.5
0.001
0.5
0.9
1.4
0.2
3.6
0.61
0.9
1.03
2.6
0.1
0.26
0.2
0.5
1.36
1.8
1.3
0.5
0.69
0.54
0.6
0.6
2.8
0.22
0.3
0.6
0.001
Median Detect
Concentration (u.g/L)
Total
0.95
1.7
0.55
1.2
2
1.3
1.5
1.42
0.52
0.72
1.9
0.8
1.12
2.2
0.6
1
1.9
0.9
0.9
0.5
1.67
0.79
1.1
2
1.31
1.1
0.6
1.3
8.5
5.1
1.1
0.7
2
0.9
1.19
0.695
0.9
0.8
3.65
1.6
0.95
0.99
0.5
1
1.6
GW
0.76
1.54
0.55
1.3
2.2
1.3
1
1.36
0.52
0.735
1.9
0.8
1.12
2.2
0.65
1
1.9
0.88
0.9
0.5
1.67
0.775
1.1
1.08
1.31
1.1
0.6
1.2
1.05
8.2
1.1
0.7
2
0.9
1.19
0.695
0.8
0.8
6.65
1.6
0.95
1
0.5
1
1.6
SW
1.11
1.82
0.79
1.7
1
2.8
3.955
0.52
1.75
1.35
0.5
1
0.9
1.5
0.3
3.6
0.8
0.9
3.89
2.6
0.5
8.45
9.815
3.2
1.36
1.8
1.3
0.7
1.555
0.9
0.7
1.3
2.8
0.455
0.5
1.2
1.6
90th Percentile Detect
Concentration (u.g/L)
Total
4.04
6.18
1.09
10
9.5
2.1
13.3
6.26
1.405
2.3
4.6
3.4
3.68
6.8
7
2.9
5.1
1.9
3.1
2.2
3.3
2.3
2.5
6.2
7.1
11
1.53
4.88
18.4
24.2
2.56
4.5
5.4
2
4.87
1.68
2
2.5
21.6
7
4.45
3.3
1
2
8.5
GW
3.3
4.8
1.09
11
7.4
2.1
7.1
14.6
1.405
2.3
4.6
1.8
3.68
6.8
2
2.4
5.1
1.9
3.1
2.2
3.2
1.7
2.5
1.7
7.1
11
1.6
4.56
5.9
32
2.56
5.75
5.6
2
4.87
1.68
2.2
2.5
21.6
7.05
4.45
3.3
1.3
2.01
6.5
SW
4.04
9.3
1.5
14
1
28
6.26
0.64
2.9
6.3
7
5
0.9
1.6
0.8
3.6
2.9
0.9
8.16
2.6
0.72
16.7
19
16.5
1.36
1.8
1.3
0.9
2.66
2
6.1
3.75
2.8
0.92
1
1.9
14
Maximum Detect
Concentration (u.g/L)
Total
9.54
43.1
1.84
17
177
2.6
47.1
14.6
5.1
3.1
16.19
9.6
6.4
47
23
34
45
17
10.8
16
14.3
2.9
9.52
8.16
13
45
141.5
45.01
33.1
38
14.16
23
8.43
2.5
12.7
2.29
17
13
21.6
24
9
16
1.37
2.01
177
GW
5
15.5
1.84
17
177
2.6
47.1
14.6
5.1
3.1
16.19
9.6
6.4
47
23
34
45
17
10.8
16
14.3
2.31
9.52
1.7
13
45
141.5
45.01
9.3
38
14.16
23
8.43
2.5
12.7
2.29
2.5
13
21.6
24
9
16
1.37
2.01
177
SW
9.54
43.1
2.1
88
1
42
6.26
0.64
2.9
8.5
23
25
0.9
1.6
0.8
3.6
2.9
0.9
8.16
2.6
2.1
16.7
33.1
25.8
1.36
1.8
1.3
0.9
2.66
17
6.1
3.9
2.8
0.95
1
1.9
88
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A58b. Tetrachloroethylene (PCE) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
264
454
1,059
3,657
826
1,207
319
1,509
1,822
106
1,056
935
1,429
1,474
241
718
1,054
810
2,973
1,582
1,417
848
2,367
210
771
1,258
1,398
727
338
1,522
1,944
730
1,097
145
819
245
351
4,951
500
1,589
603
1,784
403
304
50,436
GW
474
202
382
1,011
3,141
605
1,168
316
1,483
1,706
94
1,023
878
1,325
1,430
92
600
986
757
2,912
1,552
1,340
788
2,228
183
760
1,217
1,361
688
317
1,286
1,819
518
945
136
757
233
162
4,609
454
1,419
560
1,764
243
256
46,180
SW
146
62
72
48
516
221
39
3
26
116
12
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
170
43
20
160
48
4,256
Total Population Served by Systems
Reporting
Total
606,193
4,231,003
2,453,348
6,166,873
35,889,084
4,997,841
2,723,376
699,787
17,495,514
7,485,298
1,293,745
2,543,141
1,093,666
9,217,431
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,158,313
4,260,523
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,748,495
1,698,980
973,592
4,894,720
10,227,597
3,123,687
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,269,764
491,035
4,039,526
1,416,020
446,177
227,008,555
GW
232,590
1,123,190
910,322
2,796,282
13,517,016
530,207
389,454
418,387
15,249,472
1,592,517
1,239,117
1,434,515
837,604
3,017,034
2,571,485
375,363
1,749,901
1,025,295
292,773
1,978,457
3,010,848
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,712,549
1,432,432
283,701
1,044,118
3,132,660
664,833
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
628,329
227,067
2,347,782
237,670
129,229
86,396,173
SW
373,603
3,107,813
1,543,026
3,370,591
22,372,068
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,641,435
263,968
1,691,744
1,178,350
316,948
140,612,382
Percent of Systems
with At Least One Detection
Total
0.968%
9.091%
1.542%
2.833%
6.043%
1.695%
4.225%
2.194%
0.729%
0.823%
0.000%
1.705%
2.781%
1.610%
1.357%
6.224%
12.953%
2.941%
1.111%
1.043%
2.718%
0.847%
1.179%
2.535%
1.905%
2.464%
2.305%
7.654%
3.576%
2.959%
1.445%
1.492%
1.233%
1.550%
4.138%
2.808%
1.633%
2.564%
0.727%
1.800%
1.259%
2.819%
3.643%
4.963%
1.316%
2.502%
GW
0.844%
7.921%
1.832%
2.671%
5.126%
1.983%
3.853%
1.899%
0.742%
0.821%
0.000%
1.564%
2.506%
1.736%
1.399%
5.435%
12.000%
3.043%
0.925%
1.065%
2.384%
0.821%
1.015%
2.648%
1.639%
2.500%
2.301%
7.421%
3.488%
2.208%
1.477%
1.539%
1.544%
1.693%
3.676%
2.906%
1.717%
2.469%
0.716%
1.762%
1.339%
3.036%
3.571%
6.584%
1.172%
2.362%
SW
1.370%
12.903%
0.000%
6.250%
11.628%
0.905%
15.385%
33.333%
0.000%
0.862%
0.000%
6.061%
7.018%
0.000%
0.000%
6.711%
17.797%
1.471%
3.774%
0.000%
20.000%
1.299%
3.333%
0.719%
3.704%
0.000%
2.439%
16.216%
5.128%
14.286%
1.271%
0.800%
0.472%
0.658%
11.111%
1.613%
0.000%
2.646%
0.877%
2.174%
0.588%
0.000%
10.000%
2.500%
2.083%
4.018%
Percent of Population Served
with At Least One Detection
Total
36.994%
20.375%
1.403%
29.125%
43.506%
1.416%
11.989%
7.728%
3.878%
0.774%
0.000%
11.839%
25.094%
3.374%
5.387%
9.113%
14.611%
6.629%
1.333%
1.116%
9.550%
0.929%
15.683%
1.266%
2.342%
9.203%
7.856%
29.098%
41.846%
36.481%
6.635%
1.296%
2.594%
1.851%
12.189%
1.190%
7.503%
3.794%
9.994%
20.974%
0.141%
1.220%
17.882%
3.186%
0.203%
14.076%
GW
0.853%
23.612%
3.780%
31.867%
32.570%
12.977%
14.457%
4.291%
4.450%
0.696%
0.000%
13.903%
9.938%
10.309%
10.246%
3.644%
44.536%
32.102%
1.459%
4.039%
12.596%
1.505%
21.455%
4.930%
2.467%
19.624%
11.664%
30.068%
49.062%
6.842%
5.125%
4.023%
8.858%
8.688%
4.301%
4.039%
10.293%
6.451%
17.309%
13.157%
1.177%
2.639%
28.502%
6.878%
0.391%
15.923%
SW
59.494%
19.205%
0.000%
26.850%
50.112%
0.044%
11.577%
12.839%
0.000%
0.795%
0.000%
9.168%
74.670%
0.000%
0.000%
9.599%
6.918%
0.096%
1.249%
0.000%
2.212%
0.187%
10.315%
0.060%
2.236%
0.000%
5.093%
28.576%
3.064%
48.670%
7.045%
0.092%
0.901%
0.190%
14.043%
0.394%
0.000%
2.873%
5.694%
36.520%
0.001%
0.000%
3.142%
2.441%
0.126%
12.940%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A58c. Tetrachloroethylene (PCE) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 5 ug/L
Total
1
8
0
6
88
0
15
2
1
0
0
3
3
3
3
3
20
6
1
2
4
1
0
3
1
8
6
10
3
3
5
2
2
4
0
4
0
1
3
5
3
3
5
0
0
241
GW
0
3
0
6
58
0
12
1
1
0
0
3
2
3
3
1
13
6
1
2
4
1
0
3
0
8
6
10
2
2
4
2
2
4
0
4
0
0
2
5
3
3
5
0
0
185
SW
1
5
0
0
30
0
3
1
0
0
0
0
1
0
0
2
7
0
0
0
0
0
0
0
1
0
0
0
1
1
1
0
0
0
0
0
0
1
1
0
0
0
0
0
0
56
Percent of Systems
with At Least One Detection
> 5 ug/L
Total
0.161%
3.030%
0.000%
0.567%
2.406%
0.000%
1.243%
0.627%
0.066%
0.000%
0.000%
0.284%
0.321%
0.210%
0.204%
1.245%
2.786%
0.569%
0.123%
0.067%
0.253%
0.071%
0.000%
0.127%
0.476%
1.038%
0.477%
0.715%
0.413%
0.888%
0.329%
0.103%
0.274%
0.365%
0.000%
0.488%
0.000%
0.285%
0.061%
1.000%
0.189%
0.498%
0.280%
0.000%
0.000%
0.478%
GW
0.000%
1.485%
0.000%
0.593%
1.847%
0.000%
1.027%
0.316%
0.067%
0.000%
0.000%
0.293%
0.228%
0.226%
0.210%
1.087%
2.167%
0.609%
0.132%
0.069%
0.258%
0.075%
0.000%
0.135%
0.000%
1.053%
0.493%
0.735%
0.291%
0.631%
0.311%
0.110%
0.386%
0.423%
0.000%
0.528%
0.000%
0.000%
0.043%
1.101%
0.211%
0.536%
0.283%
0.000%
0.000%
0.401%
SW
0.685%
8.065%
0.000%
0.000%
5.814%
0.000%
7.692%
33.333%
0.000%
0.000%
0.000%
0.000%
1.754%
0.000%
0.000%
1.342%
5.932%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.704%
0.000%
0.000%
0.000%
2.564%
4.762%
0.424%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.529%
0.292%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.316%
Population Served by Systems
with At Least One Detection
> 5 ug/L
Total
60
563,685
0
53,295
11,244,688
0
160,099
45,331
315,516
0
0
2,330
196,565
39,517
15,270
195
439,709
25,570
155
3,145
50,911
500
0
1,610
6,826
61,022
2,280
223,585
93,085
352,410
294,555
185
41,408
17,110
0
5,800
0
6,597
185,225
105,470
598
1,453
82,186
0
0
14,637,946
GW
0
31,322
0
53,295
2,364,769
0
9,872
9,201
315,516
0
0
2,330
10,565
39,517
15,270
100
222,107
25,570
155
3,145
50,911
500
0
1,610
0
61,022
2,280
223,585
84,948
18,040
23,605
185
41,408
17,110
0
5,800
0
0
284
105,470
598
1,453
82,186
0
0
3,823,729
SW
60
532,363
0
0
8,879,919
0
150,227
36,130
0
0
0
0
186,000
0
0
95
217,602
0
0
0
0
0
0
0
6,826
0
0
0
8,137
334,370
270,950
0
0
0
0
0
0
6,597
184,941
0
0
0
0
0
0
10,814,217
Percent of Population Served
with At Least One Detection
> 5 ug/L
Total
0.010%
13.323%
0.000%
0.864%
31.332%
0.000%
5.879%
6.478%
1.803%
0.000%
0.000%
0.092%
17.973%
0.429%
0.312%
0.004%
5.138%
0.509%
0.021%
0.044%
1.195%
0.017%
0.000%
0.023%
1.214%
4.173%
0.240%
2.886%
5.479%
36.197%
6.018%
0.002%
1.326%
0.582%
0.000%
0.173%
0.000%
0.116%
0.738%
4.131%
0.011%
0.296%
2.035%
0.000%
0.000%
6.448%
GW
0.000%
2.789%
0.000%
1.906%
17.495%
0.000%
2.535%
2.199%
2.069%
0.000%
0.000%
0.162%
1.261%
1.310%
0.594%
0.027%
12.693%
2.494%
0.053%
0.159%
1.691%
0.030%
0.000%
0.093%
0.000%
8.899%
0.571%
8.243%
5.930%
6.359%
2.261%
0.006%
6.228%
2.977%
0.000%
0.791%
0.000%
0.000%
0.003%
6.208%
0.095%
0.640%
3.501%
0.000%
0.000%
4.426%
SW
0.016%
17.130%
0.000%
0.000%
39.692%
0.000%
6.437%
12.839%
0.000%
0.000%
0.000%
0.000%
72.639%
0.000%
0.000%
0.002%
3.197%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.236%
0.000%
0.000%
0.000%
3.053%
48.467%
7.037%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.156%
1.169%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
7.691%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A58d. Tetrachloroethylene (PCE) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2.5 ug/L
Total
3
10
0
10
113
1
23
2
3
2
0
7
4
10
7
3
41
11
1
7
6
5
1
11
1
13
9
18
4
3
7
8
2
7
1
5
0
2
10
6
7
5
15
0
0
404
GW
2
5
0
10
79
1
19
1
3
2
0
6
2
10
7
1
30
11
1
7
6
4
0
11
0
13
8
18
3
2
6
8
2
7
1
4
0
1
9
5
6
5
15
0
0
331
SW
1
5
0
0
34
0
4
1
0
0
0
1
2
0
0
2
11
0
0
0
0
1
1
0
1
0
1
0
1
1
1
0
0
0
0
1
0
1
1
1
1
0
0
0
0
73
Percent of Systems
with At Least One Detection
> 2.5 ug/L
Total
0.484%
3.788%
0.000%
0.944%
3.090%
0.121%
1.906%
0.627%
0.199%
0.110%
0.000%
0.663%
0.428%
0.700%
0.475%
1.245%
5.710%
1.044%
0.123%
0.235%
0.379%
0.353%
0.118%
0.465%
0.476%
1.686%
0.715%
1.288%
0.550%
0.888%
0.460%
0.412%
0.274%
0.638%
0.690%
0.611%
0.000%
0.570%
0.202%
1.200%
0.441%
0.829%
0.841%
0.000%
0.000%
0.801%
GW
0.422%
2.475%
0.000%
0.989%
2.515%
0.165%
1.627%
0.316%
0.202%
0.117%
0.000%
0.587%
0.228%
0.755%
0.490%
1.087%
5.000%
1.116%
0.132%
0.240%
0.387%
0.299%
0.000%
0.494%
0.000%
1.711%
0.657%
1.323%
0.436%
0.631%
0.467%
0.440%
0.386%
0.741%
0.735%
0.528%
0.000%
0.617%
0.195%
1.101%
0.423%
0.893%
0.850%
0.000%
0.000%
0.717%
SW
0.685%
8.065%
0.000%
0.000%
6.589%
0.000%
10.256%
33.333%
0.000%
0.000%
0.000%
3.030%
3.509%
0.000%
0.000%
1.342%
9.322%
0.000%
0.000%
0.000%
0.000%
1.299%
1.667%
0.000%
3.704%
0.000%
2.439%
0.000%
2.564%
4.762%
0.424%
0.000%
0.000%
0.000%
0.000%
1.613%
0.000%
0.529%
0.292%
2.174%
0.588%
0.000%
0.000%
0.000%
0.000%
1.715%
Population Served by Systems
with At Least One Detection
> 2.5 ug/L
Total
600
614,286
0
54,081
12,172,668
175
178,184
45,331
346,855
7,176
0
21,527
196,730
263,476
20,126
195
761,818
276,396
155
11,590
53,074
7,834
38,477
12,093
6,826
124,220
30,444
279,330
93,120
352,410
294,635
6,857
41,408
48,240
60
16,150
0
11,891
486,437
417,470
1,285
2,425
386,017
0
0
17,682,072
GW
540
81,923
0
54,081
3,078,916
175
25,450
9,201
346,855
7,176
0
4,913
10,565
263,476
20,126
100
458,661
276,396
155
11,590
53,074
5,371
0
12,093
0
124,220
2,444
279,330
84,983
18,040
23,685
6,857
41,408
48,240
60
5,800
0
5,294
301,496
105,470
1,260
2,425
386,017
0
0
6,157,866
SW
60
532,363
0
0
9,093,752
0
152,734
36,130
0
0
0
16,614
186,165
0
0
95
303,157
0
0
0
0
2,463
38,477
0
6,826
0
28,000
0
8,137
334,370
270,950
0
0
0
0
10,350
0
6,597
184,941
312,000
25
0
0
0
0
11,524,206
Percent of Population Served
with At Least One Detection
> 2.5 ug/L
Total
0.099%
14.519%
0.000%
0.877%
33.917%
0.004%
6.543%
6.478%
1.983%
0.096%
0.000%
0.846%
17.988%
2.858%
0.411%
0.004%
8.903%
5.502%
0.021%
0.162%
1.246%
0.261%
5.076%
0.173%
1.214%
8.496%
3.209%
3.605%
5.481%
36.197%
6.019%
0.067%
1.326%
1.641%
0.007%
0.481%
0.000%
0.209%
1.937%
16.351%
0.024%
0.494%
9.556%
0.000%
0.000%
7.789%
GW
0.232%
7.294%
0.000%
1.934%
22.778%
0.033%
6.535%
2.199%
2.275%
0.451%
0.000%
0.342%
1.261%
8.733%
0.783%
0.027%
26.211%
26.958%
0.053%
0.586%
1.763%
0.318%
0.000%
0.698%
0.000%
18.116%
0.613%
10.298%
5.933%
6.359%
2.268%
0.219%
6.228%
8.394%
0.035%
0.791%
0.000%
0.362%
3.243%
6.208%
0.201%
1.068%
16.442%
0.000%
0.000%
7.127%
SW
0.016%
17.130%
0.000%
0.000%
40.648%
0.000%
6.544%
12.839%
0.000%
0.000%
0.000%
1.499%
72.703%
0.000%
0.000%
0.002%
4.453%
0.000%
0.000%
0.000%
0.000%
0.187%
9.799%
0.000%
2.236%
0.000%
5.093%
0.000%
3.053%
48.467%
7.037%
0.000%
0.000%
0.000%
0.000%
0.394%
0.000%
0.156%
1.169%
36.520%
0.001%
0.000%
0.000%
0.000%
0.000%
8.196%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A58e. Tetrachloroethylene (PCE) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>lug/L
Total
4
16
1
18
171
5
33
6
5
4
0
12
16
15
13
5
69
23
4
14
11
8
5
31
4
14
11
38
7
7
11
22
4
10
4
16
1
7
23
9
13
11
24
4
4
733
GW
2
11
1
16
120
3
28
5
5
4
0
11
13
15
13
2
53
23
2
14
11
7
4
31
3
14
10
36
6
5
10
21
3
9
4
15
1
2
21
8
12
11
24
3
3
615
SW
2
5
0
2
51
2
5
1
0
0
0
1
3
0
0
3
16
0
2
0
0
1
1
0
1
0
1
2
1
2
1
1
1
1
0
1
0
5
2
1
1
0
0
1
1
118
Percent of Systems
with At Least One Detection
> 1 ug/L
Total
0.645%
6.061%
0.220%
1.700%
4.676%
0.605%
2.734%
1.881%
0.331%
0.220%
0.000%
1.136%
1.711%
1.050%
0.882%
2.075%
9.610%
2.182%
0.494%
0.471%
0.695%
0.565%
0.590%
1.310%
1.905%
1.816%
0.874%
2.718%
0.963%
2.071%
0.723%
1.132%
0.548%
0.912%
2.759%
1.954%
0.408%
1.994%
0.465%
1.800%
0.818%
1.824%
1.345%
0.993%
1.316%
1.453%
GW
0.422%
5.446%
0.262%
1.583%
3.820%
0.496%
2.397%
1.582%
0.337%
0.234%
0.000%
1.075%
1.481%
1.132%
0.909%
2.174%
8.833%
2.333%
0.264%
0.481%
0.709%
0.522%
0.508%
1.391%
1.639%
1.842%
0.822%
2.645%
0.872%
1.577%
0.778%
1.154%
0.579%
0.952%
2.941%
1.982%
0.429%
1.235%
0.456%
1.762%
0.846%
1.964%
1.361%
1.235%
1.172%
1.332%
SW
1.370%
8.065%
0.000%
4.167%
9.884%
0.905%
12.821%
33.333%
0.000%
0.000%
0.000%
3.030%
5.263%
0.000%
0.000%
2.013%
13.559%
0.000%
3.774%
0.000%
0.000%
1.299%
1.667%
0.000%
3.704%
0.000%
2.439%
5.405%
2.564%
9.524%
0.424%
0.800%
0.472%
0.658%
0.000%
1.613%
0.000%
2.646%
0.585%
2.174%
0.588%
0.000%
0.000%
0.625%
2.083%
2.773%
Population Served by Systems
with At Least One Detection
>lug/L
Total
222,811
748,146
19,465
1,366,960
14,825,825
42,236
273,620
53,281
547,143
8,127
0
98,355
263,947
265,484
144,949
49,095
1,091,310
327,996
5,630
66,157
110,145
17,361
38,917
58,871
13,170
125,114
30,574
1,035,707
198,570
353,680
298,846
74,168
63,642
53,178
4,838
34,996
99
128,955
1,776,182
535,520
3,966
4,059
406,853
9,963
905
25,798,816
GW
540
215,783
19,465
761,960
3,871,181
40,256
43,684
17,151
547,143
8,127
0
81,741
75,897
265,484
144,949
200
697,472
327,996
190
66,157
110,145
14,898
440
58,871
6,344
125,114
2,574
332,953
190,433
18,910
27,896
67,619
41,489
48,678
4,838
24,646
99
7,619
1,563,928
223,520
3,941
4,059
406,853
8,163
505
10,479,911
SW
222,271
532,363
0
605,000
10,954,644
1,980
229,936
36,130
0
0
0
16,614
188,050
0
0
48,895
393,838
0
5,440
0
0
2,463
38,477
0
6,826
0
28,000
702,754
8,137
334,770
270,950
6,549
22,153
4,500
0
10,350
0
121,336
212,254
312,000
25
0
0
1,800
400
15,318,905
Percent of Population Served
with At Least One Detection
>lug/L
Total
36.756%
17.682%
0.793%
22.166%
41.310%
0.845%
10.047%
7.614%
3.127%
0.109%
0.000%
3.867%
24.134%
2.880%
2.963%
1.067%
12.753%
6.529%
0.773%
0.924%
2.585%
0.578%
5.135%
0.841%
2.342%
8.557%
3.222%
13.367%
11.688%
36.327%
6.105%
0.725%
2.037%
1.809%
0.529%
1.043%
0.037%
2.268%
7.073%
20.974%
0.075%
0.827%
10.072%
0.704%
0.203%
11.365%
GW
0.232%
19.212%
2.138%
27.249%
28.639%
7.593%
11.217%
4.099%
3.588%
0.510%
0.000%
5.698%
9.061%
8.800%
5.637%
0.053%
39.858%
31.990%
0.065%
3.344%
3.658%
0.882%
0.120%
3.397%
2.467%
18.246%
0.645%
12.275%
13.294%
6.665%
2.672%
2.159%
6.241%
8.470%
2.782%
3.363%
0.051%
0.521%
16.822%
13.157%
0.627%
1.788%
17.329%
3.435%
0.391%
12.130%
SW
59.494%
17.130%
0.000%
17.949%
48.966%
0.044%
9.852%
12.839%
0.000%
0.000%
0.000%
1.499%
73.439%
0.000%
0.000%
1.157%
5.785%
0.000%
1.249%
0.000%
0.000%
0.187%
9.799%
0.000%
2.236%
0.000%
5.093%
13.955%
3.053%
48.525%
7.037%
0.092%
0.901%
0.190%
0.000%
0.394%
0.000%
2.873%
1.342%
36.520%
0.001%
0.000%
0.000%
0.153%
0.126%
10.894%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A58f. Tetrachloroethylene (PCE) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.5 ug/L
Total
4
24
3
25
219
11
50
7
5
13
0
18
23
23
18
9
89
30
6
20
18
12
10
55
4
16
27
73
10
9
15
29
6
17
6
22
3
9
33
9
20
16
38
5
4
1,063
GW
2
16
3
23
159
9
44
6
5
12
0
16
20
23
18
5
69
29
4
20
17
11
8
54
3
16
26
69
9
6
14
28
5
16
5
21
3
4
30
8
19
16
37
4
3
915
SW
2
8
0
2
60
2
6
1
0
1
0
2
3
0
0
4
20
1
2
0
1
1
2
1
1
0
1
4
1
3
1
1
1
1
1
1
0
5
3
1
1
0
1
1
1
148
Percent of Systems
with At Least One Detection
> 0.5 ug/L
Total
0.645%
9.091%
0.661%
2.361%
5.989%
1.332%
4.143%
2.194%
0.331%
0.714%
0.000%
1.705%
2.460%
1.610%
1.221%
3.734%
12.396%
2.846%
0.741%
0.673%
1.138%
0.847%
1.179%
2.324%
1.905%
2.075%
2.146%
5.222%
1.376%
2.663%
0.986%
1.492%
0.822%
1.550%
4.138%
2.686%
1.224%
2.564%
0.667%
1.800%
1.259%
2.653%
2.130%
1.241%
1.316%
2.108%
GW
0.422%
7.921%
0.785%
2.275%
5.062%
1.488%
3.767%
1.899%
0.337%
0.703%
0.000%
1.564%
2.278%
1.736%
1.259%
5.435%
11.500%
2.941%
0.528%
0.687%
1.095%
0.821%
1.015%
2.424%
1.639%
2.105%
2.136%
5.070%
1.308%
1.893%
1.089%
1.539%
0.965%
1.693%
3.676%
2.774%
1.288%
2.469%
0.651%
1.762%
1.339%
2.857%
2.098%
1.646%
1.172%
1.981%
SW
1.370%
12.903%
0.000%
4.167%
11.628%
0.905%
15.385%
33.333%
0.000%
0.862%
0.000%
6.061%
5.263%
0.000%
0.000%
2.685%
16.949%
1.471%
3.774%
0.000%
3.333%
1.299%
3.333%
0.719%
3.704%
0.000%
2.439%
10.811%
2.564%
14.286%
0.424%
0.800%
0.472%
0.658%
11.111%
1.613%
0.000%
2.646%
0.877%
2.174%
0.588%
0.000%
5.000%
0.625%
2.083%
3.477%
Population Served by Systems
with At Least One Detection
> 0.5 ug/L
Total
222,811
862,055
24,460
1,487,387
15,548,678
69,582
326,356
54,081
547,143
57,672
0
301,076
268,828
311,020
204,818
88,762
1,232,504
332,919
8,795
76,588
225,783
27,896
118,871
78,110
13,170
125,364
74,254
1,735,338
199,447
354,880
319,962
132,561
70,071
54,427
111,396
38,464
14,490
215,680
2,507,699
535,520
7,422
5,949
548,008
14,540
905
29,555,742
GW
540
265,205
24,460
882,387
4,337,492
67,602
56,164
17,951
547,143
10,811
0
199,434
80,778
311,020
204,818
13,679
778,651
329,079
3,355
76,588
211,700
25,433
78,369
74,961
6,344
125,364
46,254
698,387
191,310
19,110
49,012
126,012
47,918
49,927
7,480
28,114
14,490
94,344
1,607,200
223,520
7,397
5,949
513,508
12,740
505
12,472,505
SW
222,271
596,850
0
605,000
11,211,186
1,980
270,192
36,130
0
46,861
0
101,642
188,050
0
0
75,083
453,853
3,840
5,440
0
14,083
2,463
40,502
3,149
6,826
0
28,000
1,036,951
8,137
335,770
270,950
6,549
22,153
4,500
103,916
10,350
0
121,336
900,499
312,000
25
0
34,500
1,800
400
17,083,237
Percent of Population Served
with At Least One Detection
> 0.5 ug/L
Total
36.756%
20.375%
0.997%
24.119%
43.324%
1.392%
11.984%
7.728%
3.127%
0.770%
0.000%
11.839%
24.580%
3.374%
4.187%
1.929%
14.403%
6.627%
1.208%
1.070%
5.299%
0.929%
15.683%
1.116%
2.342%
8.574%
7.826%
22.396%
11.739%
36.451%
6.537%
1.296%
2.243%
1.851%
12.189%
1.146%
5.439%
3.794%
9.986%
20.974%
0.141%
1.212%
13.566%
1.027%
0.203%
13.020%
GW
0.232%
23.612%
2.687%
31.556%
32.089%
12.750%
14.421%
4.291%
3.588%
0.679%
0.000%
13.903%
9.644%
10.309%
7.965%
3.644%
44.497%
32.096%
1.146%
3.871%
7.031%
1.505%
21.455%
4.326%
2.467%
18.283%
11.593%
25.747%
13.356%
6.736%
4.694%
4.023%
7.208%
8.688%
4.301%
3.836%
7.461%
6.451%
17.287%
13.157%
1.177%
2.620%
21.872%
5.360%
0.391%
14.436%
SW
59.494%
19.205%
0.000%
17.949%
50.112%
0.044%
11.577%
12.839%
0.000%
0.795%
0.000%
9.168%
73.439%
0.000%
0.000%
1.776%
6.667%
0.096%
1.249%
0.000%
1.127%
0.187%
10.315%
0.060%
2.236%
0.000%
5.093%
20.591%
3.053%
48.670%
7.037%
0.092%
0.901%
0.190%
14.043%
0.394%
0.000%
2.873%
5.694%
36.520%
0.001%
0.000%
2.039%
0.153%
0.126%
12.149%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A59. Thallium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 0.002 mg/L
> 0.001 mg/L
> 0.002 mg/L
> 0.001 mg/L
> 0.002 mg/L
> 0.001 mg/L
Total # Systems
Reporting
44,898
44,898
4,027
4,027
48,925
48,925
# Systems Exceeding
Threshold of Interest
101
703
24
154
125
857
% Systems Exceeding
Threshold of Interest
0.225%
1.566%
0.596%
3.824%
0.255%
1.752%
Total Pop Served by
Systems Reporting
85,832,905
85,832,905
137,491,940
137,491,940
223,324,845
223,324,845
Total Pop. Served by
Systems Exceeding
Threshold of Interest
281,729
5,653,247
1,550,072
14,008,014
1,831,801
19,661,261
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.328%
6.586%
1.127%
10.188%
0.820%
8.804%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A59a. Thallium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
1,498
2,639
2,214
6,273
34,960
4,373
2,231
686
2,143
2,691
1,176
1,482
3,080
2,762
4,724
1,809
2,990
5,064
2,341
6,722
4,437
5,706
3,169
9,271
345
2,976
2,928
6,591
3,520
2,109
3,296
4,648
396
1,311
860
3,446
412
1,838
14,759
6,998
2,800
2,107
7,038
1,105
1,123
185,047
GW
1,062
1,795
1,550
5,002
20,908
2,334
1,841
639
2,074
2,368
1,114
1,219
2,798
2,362
4,243
554
2,006
3,961
1,956
6,543
4,358
4,929
2,829
7,828
303
2,867
2,764
5,867
3,194
1,536
2,497
4,011
333
951
630
2,982
383
644
12,179
5,459
2,192
1,763
6,867
421
874
144,990
SW
436
844
664
1,271
14,052
2,039
390
47
69
323
62
263
282
400
481
1,255
984
1,103
385
179
79
111
340
1,443
42
109
164
724
326
573
799
637
63
360
230
464
29
1,194
2,580
1,539
608
344
171
684
249
40,057
Percent of Samples
with Detections
Total
4.539%
0.379%
0.407%
1.084%
0.503%
2.424%
0.941%
1.603%
5.880%
0.149%
0.000%
0.000%
0.877%
0.615%
0.910%
6.302%
1.906%
0.533%
0.128%
3.139%
0.518%
0.105%
0.032%
1.402%
0.000%
0.101%
0.376%
0.804%
26.932%
0.901%
1.608%
0.409%
0.505%
0.076%
0.233%
0.784%
0.000%
6.910%
0.285%
3.844%
0.286%
0.285%
3.055%
2.353%
0.623%
1.673%
GW
4.614%
0.501%
0.323%
1.060%
0.550%
2.828%
1.086%
1.721%
6.027%
0.169%
0.000%
0.000%
0.858%
0.677%
0.919%
2.347%
2.343%
0.429%
0.051%
3.179%
0.505%
0.122%
0.000%
1.405%
0.000%
0.105%
0.398%
0.835%
27.771%
0.781%
1.482%
0.374%
0.300%
0.000%
0.000%
0.704%
0.000%
0.311%
0.296%
4.158%
0.319%
0.340%
3.087%
3.563%
0.572%
1.728%
SW
4.358%
0.118%
0.602%
1.180%
0.434%
1.962%
0.256%
0.000%
1.449%
0.000%
0.000%
0.000%
1.064%
0.250%
0.832%
8.048%
1.016%
0.907%
0.519%
1.676%
1.266%
0.000%
0.294%
1.386%
0.000%
0.000%
0.000%
0.552%
18.712%
1.222%
2.003%
0.628%
1.587%
0.278%
0.870%
1.293%
0.000%
10.469%
0.233%
2.729%
0.164%
0.000%
1.754%
1.608%
0.803%
1.473%
Minimum Detect
Concentration (mg/L)
Total
6.1E-05
0.001
0.0005
0.0007
3.3E-05
0.00006
0.0001
0.0001
0.0001
0.0011
0.00003
5.1E-05
0.00018
0.0001
0.0002
0.00003
0.001
0.0001
0.001
0.00104
0.002
0.00009
0.0001
0.00007
0.0001
0.00003
0.0001
0.00004
0.0006
0.0026
0.002
0.0008
0.001
0.0007
0.0004
0.0002
0.002
0.001
0.00003
0.00012
0.0004
0.00003
GW
6.1E-05
0.001
0.0006
0.0007
4.7E-05
0.0001
0.0005
0.0001
0.0001
0.0011
0.00003
5.1E-05
0.00018
0.0001
0.0002
0.0002
0.001
0.0001
0.001
0.00104
0.00009
0.0001
0.00007
0.0001
0.00003
0.0001
0.00004
0.00064
0.0026
0.001
0.0007
0.0004
0.0003
0.002
0.001
0.00003
0.00012
0.0004
0.00003
SW
0.00016
0.00209
0.0005
0.001
3.3E-05
0.00006
0.0001
0.0001
0.0001
0.0012
0.0005
0.0001
0.0003
0.00003
0.001
0.0001
0.001
0.002
0.0006
0.0007
0.00003
0.001
0.00059
0.0006
0.01
0.002
0.0008
0.001
0.0009
0.00049
0.0002
0.002
0.0002
0.00012
0.0012
0.00003
Median Detect
Concentration (mg/L)
Total
0.001
0.005
0.0006
0.001
0.001
0.00058
0.0012
0.0002
0.0005
0.00135
0.0007
0.0012
0.001
0.00095
0.001
0.001
0.001
0.0001
0.0012
0.00137
0.002
0.001
0.0001
0.001
0.002
0.0001
0.0011
0.001
0.00145
0.0063
0.002
0.0009
0.002
0.0011
0.00118
0.0011
0.002
0.001
0.0006
0.001
0.0012
0.00067
GW
0.001
0.005
0.0006
0.001
0.001
0.0006
0.00135
0.0002
0.0005
0.00135
0.00085
0.0013
0.0014
0.0009
0.001
0.0011
0.001
0.0001
0.0012
0.00137
0.001
0.0001
0.001
0.002
0.0001
0.001
0.001
0.0015
0.0026
0.002
0.00115
0.00118
0.0011
0.002
0.001
0.0006
0.001
0.002
0.00046
SW
0.001
0.00209
0.00055
0.001
0.001
0.00048
0.0001
0.0001
0.0002
0.0012
0.0009
0.001
0.001
0.001
0.0015
0.0001
0.001
0.002
0.001
0.0015
0.0001
0.002
0.0013
0.0007
0.01
0.002
0.0009
0.002
0.0011
0.00118
0.001
0.002
0.00041
0.001
0.0012
0.001
90th Percentile Detect
Concentration (mg/L)
Total
0.00162
0.0085
0.001
0.001
0.0023
0.0018
0.002
0.001
0.0014
0.0015
0.0017
0.002
0.003
0.0019
0.002
0.003
0.002
0.0003
0.0016
0.00165
0.002
0.00225
0.001
0.01
0.005
0.00051
0.0065
0.003
0.0017
0.01
0.002
0.001
0.003
0.0017
0.00276
0.002
0.002
0.002
0.0017
0.001
0.01
0.002
GW
0.00162
0.01
0.001
0.001
0.0025
0.002
0.0021
0.001
0.0014
0.0015
0.0017
0.002
0.003
0.002
0.002
0.004
0.001
0.0003
0.0016
0.00165
0.0024
0.001
0.01
0.005
0.00047
0.0028
0.002
0.0017
0.0026
0.003
0.0016
0.0036
0.002
0.002
0.002
0.0017
0.001
0.01
0.002
SW
0.0017
0.00209
0.0007
0.001
0.00218
0.00165
0.0001
0.0001
0.0006
0.0012
0.001
0.0018
0.00185
0.00212
0.002
0.0001
0.001
0.002
0.002
0.005
0.00078
0.0072
0.005
0.0007
0.01
0.002
0.001
0.003
0.0017
0.00234
0.0047
0.002
0.0007
0.001
0.0012
0.002
Maximum Detect
Concentration (mg/L)
Total
0.00246
0.01
0.001
0.01
0.01
0.005
0.005
0.002
0.006
0.0015
0.0055
0.0025
0.0088
0.01
0.0033
0.004
0.002
0.01
0.0023
0.00165
0.002
0.09
0.001
0.01
0.01
0.01
0.0072
0.01
0.00181
0.01
0.002
0.001
0.01
0.002
0.02
0.01
0.002
0.002
0.01
0.001
0.01
0.09
GW
0.00246
0.01
0.001
0.003
0.01
0.005
0.005
0.002
0.006
0.0015
0.0055
0.0025
0.0088
0.002
0.0033
0.004
0.001
0.01
0.0023
0.00165
0.09
0.001
0.01
0.01
0.01
0.0065
0.01
0.00181
0.0026
0.01
0.0016
0.02
0.01
0.002
0.002
0.01
0.001
0.01
0.09
SW
0.002
0.00209
0.0007
0.01
0.01
0.0033
0.0001
0.0001
0.0006
0.0012
0.001
0.01
0.002
0.00223
0.002
0.0001
0.001
0.002
0.003
0.005
0.00351
0.0072
0.009
0.0007
0.01
0.002
0.001
0.003
0.002
0.00234
0.01
0.002
0.0007
0.001
0.0012
0.01
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A59b. Thallium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
610
352
453
1,051
3,744
838
1,170
281
1,333
1,586
107
963
923
1,240
1,622
242
676
1,038
802
3,033
1,593
1,420
849
2,284
217
743
1,216
1,374
725
334
1,552
1,933
184
730
143
823
234
351
4,888
507
1,582
601
1,823
451
304
48,925
GW
467
279
381
1,003
3,227
617
1,131
278
1,307
1,472
95
930
874
1,139
1,573
93
558
970
748
2,980
1,564
1,343
789
2,145
190
732
1,175
1,337
686
313
1,316
1,808
168
609
134
758
223
162
4,547
457
1,414
558
1,803
290
255
44,898
SW
143
73
72
48
517
221
39
3
26
114
12
33
49
101
49
149
118
68
54
53
29
77
60
139
27
11
41
37
39
21
236
125
16
121
9
65
11
189
341
50
168
43
20
161
49
4,027
Total Population Served by Systems
Reporting
Total
592,922
4,701,100
2,452,800
6,159,082
36,250,792
4,998,506
2,716,176
679,823
17,371,132
7,238,277
1,303,767
2,495,648
1,078,374
9,078,598
4,980,032
4,602,489
8,525,575
5,022,488
727,134
6,717,830
4,265,162
3,006,718
757,930
6,973,609
563,069
1,450,223
942,517
7,762,423
1,668,123
973,017
4,383,193
10,225,465
680,015
2,770,014
913,584
3,468,333
339,259
5,685,258
25,060,220
2,543,652
4,803,450
490,989
4,044,416
1,415,477
446,184
223,324,845
GW
230,950
1,463,066
909,774
2,788,491
13,502,653
533,275
382,254
398,423
15,125,090
1,345,946
1,249,139
1,387,022
833,464
2,879,370
2,619,577
375,460
1,718,151
1,024,381
291,530
1,925,399
3,015,521
1,692,257
365,261
1,708,443
257,844
673,743
392,718
2,726,477
1,401,575
283,126
1,213,289
3,130,528
269,060
486,768
173,606
809,806
247,298
1,462,502
9,275,719
1,686,017
634,384
227,021
2,352,672
234,687
129,168
85,832,905
SW
361,972
3,238,034
1,543,026
3,370,591
22,748,139
4,465,231
2,333,922
281,400
2,246,042
5,892,331
54,628
1,108,626
244,910
6,199,228
2,360,455
4,227,029
6,807,424
3,998,107
435,604
4,792,431
1,249,641
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,169,904
7,094,937
410,955
2,283,246
739,978
2,658,527
91,961
4,222,756
15,784,501
857,635
4,169,066
263,968
1,691,744
1,180,790
317,016
137,491,940
Percent of Systems
with At Least One Detection
Total
9.672%
1.420%
1.325%
4.662%
2.751%
7.041%
1.795%
3.203%
6.302%
0.252%
0.000%
0.000%
2.384%
1.210%
2.404%
25.620%
5.473%
2.119%
0.374%
6.100%
1.067%
0.352%
0.118%
4.991%
0.000%
0.269%
0.740%
3.130%
42.759%
2.994%
3.028%
0.776%
1.087%
0.137%
1.399%
2.552%
0.000%
1.140%
0.675%
14.990%
0.379%
0.832%
9.490%
4.878%
2.303%
3.493%
GW
9.850%
1.434%
1.312%
4.088%
2.262%
5.835%
1.768%
3.237%
6.350%
0.272%
0.000%
0.000%
2.288%
1.229%
2.352%
10.753%
5.735%
1.753%
0.134%
6.107%
1.023%
0.372%
0.000%
4.569%
0.000%
0.273%
0.766%
2.917%
43.440%
2.875%
2.584%
0.774%
0.595%
0.000%
0.000%
2.375%
0.000%
1.235%
0.638%
14.661%
0.354%
0.896%
9.429%
5.172%
1.961%
3.285%
SW
9.091%
1.370%
1.389%
16.667%
5.803%
10.407%
2.564%
0.000%
3.846%
0.000%
0.000%
0.000%
4.082%
0.990%
4.082%
34.899%
4.237%
7.353%
3.704%
5.660%
3.448%
0.000%
1.667%
11.511%
0.000%
0.000%
0.000%
10.811%
30.769%
4.762%
5.508%
0.800%
6.250%
0.826%
22.222%
4.615%
0.000%
1.058%
1.173%
18.000%
0.595%
0.000%
15.000%
4.348%
4.082%
5.811%
Percent of Population Served
with At Least One Detection
Total
42.961%
1.213%
0.815%
16.807%
13.420%
6.727%
2.280%
5.163%
30.071%
0.227%
0.000%
0.000%
12.405%
1.291%
9.806%
25.309%
44.069%
36.598%
1.747%
6.871%
13.510%
0.553%
0.011%
14.929%
0.000%
0.076%
0.196%
9.266%
42.808%
6.911%
2.796%
16.690%
3.900%
5.998%
5.930%
2.700%
0.000%
9.123%
3.626%
44.438%
0.113%
0.192%
10.374%
1.525%
1.178%
12.626%
GW
8.329%
2.015%
0.597%
8.162%
10.810%
12.090%
0.850%
8.809%
32.629%
1.223%
0.000%
0.000%
14.262%
2.780%
7.919%
5.643%
4.237%
0.335%
0.055%
7.894%
3.667%
0.982%
0.000%
11.242%
0.000%
0.163%
0.470%
8.505%
40.152%
3.794%
5.962%
1.621%
1.507%
0.000%
0.000%
1.426%
0.000%
3.109%
0.945%
33.023%
0.456%
0.415%
16.081%
1.053%
0.701%
11.410%
SW
65.058%
0.850%
0.944%
23.958%
14.970%
6.087%
2.515%
0.000%
12.848%
0.000%
0.000%
0.000%
6.083%
0.600%
11.901%
27.055%
54.123%
45.890%
2.880%
6.461%
37.262%
0.000%
0.022%
16.125%
0.000%
0.000%
0.000%
9.679%
56.774%
8.190%
1.585%
23.340%
5.466%
7.277%
7.322%
3.087%
0.000%
11.206%
5.202%
66.878%
0.061%
0.000%
2.438%
1.619%
1.372%
13.385%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A59c. Thallium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.002 mg/L
Total
1
4
0
2
15
7
2
0
2
0
0
0
1
1
10
3
1
6
0
1
1
0
0
12
0
0
2
7
7
3
6
0
2
0
0
5
0
0
8
8
0
0
6
0
2
125
GW
1
3
0
1
12
5
2
0
2
0
0
0
1
1
10
0
1
5
0
1
1
0
0
11
0
0
2
6
6
2
3
0
1
0
0
4
0
0
7
5
0
0
6
0
2
101
SW
0
1
0
1
3
2
0
0
0
0
0
0
0
0
0
3
0
1
0
0
0
0
0
1
0
0
0
1
1
1
3
0
1
0
0
1
0
0
1
3
0
0
0
0
0
24
Percent of Systems
with At Least One Detection
> 0.002 mg/L
Total
0.164%
1.136%
0.000%
0.190%
0.401%
0.835%
0.171%
0.000%
0.150%
0.000%
0.000%
0.000%
0.108%
0.081%
0.617%
1.240%
0.148%
0.578%
0.000%
0.033%
0.063%
0.000%
0.000%
0.525%
0.000%
0.000%
0.164%
0.509%
0.966%
0.898%
0.387%
0.000%
1.087%
0.000%
0.000%
0.608%
0.000%
0.000%
0.164%
1.578%
0.000%
0.000%
0.329%
0.000%
0.658%
0.255%
GW
0.214%
1.075%
0.000%
0.100%
0.372%
0.810%
0.177%
0.000%
0.153%
0.000%
0.000%
0.000%
0.114%
0.088%
0.636%
0.000%
0.179%
0.515%
0.000%
0.034%
0.064%
0.000%
0.000%
0.513%
0.000%
0.000%
0.170%
0.449%
0.875%
0.639%
0.228%
0.000%
0.595%
0.000%
0.000%
0.528%
0.000%
0.000%
0.154%
1.094%
0.000%
0.000%
0.333%
0.000%
0.784%
0.225%
SW
0.000%
1.370%
0.000%
2.083%
0.580%
0.905%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.013%
0.000%
1.471%
0.000%
0.000%
0.000%
0.000%
0.000%
0.719%
0.000%
0.000%
0.000%
2.703%
2.564%
4.762%
1.271%
0.000%
6.250%
0.000%
0.000%
1.538%
0.000%
0.000%
0.293%
6.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.596%
Population Served by Systems
with At Least One Detection
> 0.002 mg/L
Total
120
53,723
0
125,301
663,501
6,597
225
0
11,069
0
0
0
46,500
170
3,518
126,627
200
90,811
0
27
55,300
0
0
52,298
0
0
283
9,351
92,144
65,960
13,931
0
26,519
0
0
7,075
0
0
46,891
331,964
0
0
1,455
0
241
1,831,801
GW
120
26,189
0
801
12,953
2,297
225
0
11,069
0
0
0
46,500
170
3,518
0
200
279
0
27
55,300
0
0
29,298
0
0
283
720
19,443
9,460
2,605
0
4,056
0
0
3,467
0
0
39,687
11,366
0
0
1,455
0
241
281,729
SW
0
27,534
0
124,500
650,548
4,300
0
0
0
0
0
0
0
0
0
126,627
0
90,532
0
0
0
0
0
23,000
0
0
0
8,631
72,701
56,500
11,326
0
22,463
0
0
3,608
0
0
7,204
320,598
0
0
0
0
0
1,550,072
Percent of Population Served
with At Least One Detection
> 0.002 mg/L
Total
0.020%
1.143%
0.000%
2.034%
1.830%
0.132%
0.008%
0.000%
0.064%
0.000%
0.000%
0.000%
4.312%
0.002%
0.071%
2.751%
0.002%
1.808%
0.000%
0.000%
1.297%
0.000%
0.000%
0.750%
0.000%
0.000%
0.030%
0.120%
5.524%
6.779%
0.318%
0.000%
3.900%
0.000%
0.000%
0.204%
0.000%
0.000%
0.187%
13.051%
0.000%
0.000%
0.036%
0.000%
0.054%
0.820%
GW
0.052%
1.790%
0.000%
0.029%
0.096%
0.431%
0.059%
0.000%
0.073%
0.000%
0.000%
0.000%
5.579%
0.006%
0.134%
0.000%
0.012%
0.027%
0.000%
0.001%
1.834%
0.000%
0.000%
1.715%
0.000%
0.000%
0.072%
0.026%
1.387%
3.341%
0.215%
0.000%
1.507%
0.000%
0.000%
0.428%
0.000%
0.000%
0.428%
0.674%
0.000%
0.000%
0.062%
0.000%
0.187%
0.328%
SW
0.000%
0.850%
0.000%
3.694%
2.860%
0.096%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.996%
0.000%
2.264%
0.000%
0.000%
0.000%
0.000%
0.000%
0.437%
0.000%
0.000%
0.000%
0.171%
27.275%
8.190%
0.357%
0.000%
5.466%
0.000%
0.000%
0.136%
0.000%
0.000%
0.046%
37.382%
0.000%
0.000%
0.000%
0.000%
0.000%
1.127%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A59d. Thallium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.001 mg/L
Total
34
5
1
48
86
27
19
3
27
4
0
0
10
14
32
37
34
17
3
3
17
5
1
108
0
1
8
37
30
6
31
11
2
1
1
21
0
3
25
68
6
5
42
18
6
857
GW
24
4
1
40
63
17
19
3
27
4
0
0
10
13
31
5
30
15
1
3
16
5
0
94
0
1
8
34
28
5
19
11
1
0
0
18
0
1
22
61
5
5
42
13
4
703
SW
10
1
0
8
23
10
0
0
0
0
0
0
0
1
1
32
4
2
2
0
1
0
1
14
0
0
0
3
2
1
12
0
1
1
1
3
0
2
3
7
1
0
0
5
2
154
Percent of Systems
with At Least One Detection
> 0.001 mg/L
Total
5.574%
1.420%
0.221%
4.567%
2.297%
3.222%
1.624%
1.068%
2.026%
0.252%
0.000%
0.000%
1.083%
1.129%
1.973%
15.289%
5.030%
1.638%
0.374%
0.099%
1.067%
0.352%
0.118%
4.729%
0.000%
0.135%
0.658%
2.693%
4.138%
1.796%
1.997%
0.569%
1.087%
0.137%
0.699%
2.552%
0.000%
0.855%
0.511%
13.412%
0.379%
0.832%
2.304%
3.991%
1.974%
1.752%
GW
5.139%
1.434%
0.262%
3.988%
1.952%
2.755%
1.680%
1.079%
2.066%
0.272%
0.000%
0.000%
1.144%
1.141%
1.971%
5.376%
5.376%
1.546%
0.134%
0.101%
1.023%
0.372%
0.000%
4.382%
0.000%
0.137%
0.681%
2.543%
4.082%
1.597%
1.444%
0.608%
0.595%
0.000%
0.000%
2.375%
0.000%
0.617%
0.484%
13.348%
0.354%
0.896%
2.329%
4.483%
1.569%
1.566%
SW
6.993%
1.370%
0.000%
16.667%
4.449%
4.525%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.990%
2.041%
21.477%
3.390%
2.941%
3.704%
0.000%
3.448%
0.000%
1.667%
10.072%
0.000%
0.000%
0.000%
8.108%
5.128%
4.762%
5.085%
0.000%
6.250%
0.826%
11.111%
4.615%
0.000%
1.058%
0.880%
14.000%
0.595%
0.000%
0.000%
3.106%
4.082%
3.824%
Population Served by Systems
with At Least One Detection
> 0.001 mg/L
Total
239,006
57,014
1,834
998,818
4,033,580
244,095
3,189
967
2,780,540
16,464
0
0
54,466
117,072
293,716
858,838
3,708,067
1,803,315
12,705
627
576,207
16,620
85
1,013,112
0
43
1,736
505,088
207,584
66,348
88,507
38,726
26,519
166,150
51,000
93,633
0
513,986
200,419
821,427
5,432
942
24,205
14,193
4,986
19,661,261
GW
6,812
29,480
1,834
191,275
1,240,374
24,275
3,189
967
2,780,540
16,464
0
0
54,466
79,885
30,196
14,303
67,460
2,783
160
627
110,567
16,620
0
178,157
0
43
1,736
94,339
134,733
9,848
38,346
38,726
4,056
0
0
11,551
0
40,773
67,521
330,244
2,894
942
24,205
2,221
635
5,653,247
SW
232,194
27,534
0
807,543
2,793,206
219,820
0
0
0
0
0
0
0
37,187
263,520
844,535
3,640,607
1,800,532
12,545
0
465,640
0
85
834,955
0
0
0
410,749
72,851
56,500
50,161
0
22,463
166,150
51,000
82,082
0
473,213
132,898
491,183
2,538
0
0
11,972
4,351
14,008,014
Percent of Population Served
with At Least One Detection
> 0.001 mg/L
Total
40.310%
1.213%
0.075%
16.217%
11.127%
4.883%
0.117%
0.142%
16.007%
0.227%
0.000%
0.000%
5.051%
1.290%
5.898%
18.660%
43.493%
35.905%
1.747%
0.009%
13.510%
0.553%
0.011%
14.528%
0.000%
0.003%
0.184%
6.507%
12.444%
6.819%
2.019%
0.379%
3.900%
5.998%
5.582%
2.700%
0.000%
9.041%
0.800%
32.293%
0.113%
0.192%
0.598%
1.003%
1.117%
8.804%
GW
2.950%
2.015%
0.202%
6.859%
9.186%
4.552%
0.834%
0.243%
18.384%
1.223%
0.000%
0.000%
6.535%
2.774%
1.153%
3.809%
3.926%
0.272%
0.055%
0.033%
3.667%
0.982%
0.000%
10.428%
0.000%
0.006%
0.442%
3.460%
9.613%
3.478%
3.161%
1.237%
1.507%
0.000%
0.000%
1.426%
0.000%
2.788%
0.728%
19.587%
0.456%
0.415%
1.029%
0.946%
0.492%
6.586%
SW
64.147%
0.850%
0.000%
23.958%
12.279%
4.923%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.600%
11.164%
19.979%
53.480%
45.035%
2.880%
0.000%
37.262%
0.000%
0.022%
15.858%
0.000%
0.000%
0.000%
8.156%
27.331%
8.190%
1.582%
0.000%
5.466%
7.277%
6.892%
3.087%
0.000%
11.206%
0.842%
57.272%
0.061%
0.000%
0.000%
1.014%
1.372%
10.188%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A60. Toluene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 1,000 ug/L
> 600 ug/L
> 500 ug/L
> 1,000 ug/L
> 600 ug/L
> 500 ug/L
> 1,000 ug/L
> 600 ug/L
> 500 ug/L
Total # Systems
Reporting
46,193
46,193
46,193
4,258
4,258
4,258
50,451
50,451
50,451
# Systems Exceeding
Threshold of Interest
1
14
15
0
1
3
1
15
18
% Systems Exceeding
Threshold of Interest
0.002%
0.030%
0.032%
0.000%
0.023%
0.070%
0.002%
0.030%
0.036%
Total Pop. Served by
Systems Reporting
86,403,546
86,403,546
86,403,546
140,551,755
140,551,755
140,551,755
226,955,301
226,955,301
226,955,301
Total Pop. Served by
Systems Exceeding
Threshold of Interest
500
15,689
15,757
0
1,612
6,212
500
17,301
21,969
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.001%
0.018%
0.018%
0.000%
0.001%
0.004%
0.000%
0.008%
0.010%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A60a. Toluene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,388
846
2,393
11,717
86,373
2,919
6,945
1,051
4,160
7,174
1,791
1,997
3,742
7,035
4,623
3,351
16,249
6,775
3,693
10,754
8,596
7,544
4,496
19,062
564
6,838
9,614
20,359
6,572
3,219
7,173
8,845
5,355
2,336
1,959
4,345
889
2,943
34,177
8,980
4,933
4,358
11,303
1,150
1,664
374,250
GW
2,222
614
1,926
9,548
45,816
2,170
6,054
1,021
4,089
6,347
1,688
1,832
3,281
6,462
4,313
1,131
12,259
5,513
3,374
9,744
7,343
6,695
3,955
17,483
429
6,262
9,136
18,571
6,096
2,580
5,489
7,685
3,958
1,693
1,591
3,805
855
1,165
27,069
7,559
4,060
3,964
11,178
449
1,161
289,635
SW
1,166
232
467
2,169
40,557
749
891
30
71
827
103
165
461
573
310
2,220
3,990
1,262
319
1,010
1,253
849
541
1,579
135
576
478
1,788
476
639
1,684
1,160
1,397
643
368
540
34
1,778
7,108
1,421
873
394
125
701
503
84,615
Percent of Samples
with Detections
Total
6.346%
4.019%
1.295%
0.819%
0.315%
2.672%
1.094%
2.664%
0.962%
0.725%
0.000%
2.754%
1.015%
0.597%
2.963%
1.761%
0.677%
2.421%
1.679%
1.246%
2.873%
1.577%
0.489%
1.096%
2.482%
0.351%
2.517%
1.483%
1.263%
1.336%
1.157%
1.119%
1.120%
0.728%
1.276%
1.220%
1.012%
0.102%
1.911%
0.445%
2.352%
2.685%
2.636%
2.261%
1.983%
1.245%
GW
4.500%
3.746%
1.506%
0.880%
0.404%
2.995%
1.255%
2.742%
0.954%
0.788%
0.000%
2.183%
1.128%
0.650%
3.107%
0.973%
0.808%
2.721%
1.423%
1.293%
2.492%
1.449%
0.506%
1.161%
3.030%
0.383%
2.638%
1.556%
1.312%
1.318%
1.221%
1.262%
1.061%
0.886%
1.257%
1.340%
1.053%
0.000%
2.050%
0.463%
2.537%
2.901%
2.657%
4.232%
2.239%
1.381%
SW
9.863%
4.741%
0.428%
0.553%
0.215%
1.736%
0.000%
0.000%
1.408%
0.242%
0.000%
9.091%
0.217%
0.000%
0.968%
2.162%
0.276%
1.109%
4.389%
0.792%
5.108%
2.591%
0.370%
0.380%
0.741%
0.000%
0.209%
0.727%
0.630%
1.408%
0.950%
0.172%
1.288%
0.311%
1.359%
0.370%
0.000%
0.169%
1.379%
0.352%
1.489%
0.508%
0.800%
0.999%
1.392%
0.779%
Minimum Detect
Concentration (u.g/L)
Total
0.1
0.5
0.09
0.4
0.38
0.13
0.51
0.6
0.05
0.5
0.5
0.5
0.12
0.5
0.002
0.5
0.1
0.5
0.08
0.2
0.5
0.21
0.5
0.5
0.14
0.0077
0.07
0.1
0.52
0.12
0.5
0.1
0.2
0.2
0.51
0.51
0.5
0.5
0.4
0.5
0.2
0.02
0.16
0.5
0.002
GW
0.1
0.5
0.09
0.4
0.38
0.13
0.51
0.6
0.05
0.5
0.5
0.5
0.12
0.5
0.3
0.5
0.2
0.5
0.08
0.2
0.5
0.21
0.5
0.5
0.14
0.0077
0.07
0.1
0.55
0.5
0.5
0.1
0.2
0.2
0.51
0.51
0.5
0.4
0.5
0.2
0.02
0.16
0.5
0.0077
SW
0.12
0.55
0.14
0.5
0.5
0.2
0.09
0.96
0.5
0.5
0.86
0.002
0.5
0.1
0.5
0.5
0.2
0.5
3.8
0.5
2.02
0.74
0.1
0.77
0.52
0.12
0.7
0.43
1
0.5
0.71
0.5
0.5
0.6
0.5
0.6
0.84
0.5
0.58
0.002
Median Detect
Concentration (u.g/L)
Total
0.57
0.895
0.62
0.9
1
0.735
2.35
1.35
0.5
1.1
1.2
1.1
0.8
1.3
0.7
1.1
1.45
1.45
0.8
0.4
1.01
3.1
1.2
0.67
0.735
1.4
0.67
0.69
1.22
1.3
1.2
0.8
1.3
1.4
0.77
0.65
1.8
1.1
1.15
1
1
0.54
0.5
0.8
0.94
GW
0.695
1
0.67
0.99
1.1
0.64
2.35
1.35
0.5
1.1
1.3
1.1
0.8
1.3
0.9
1.2
1.6
1.5
0.8
0.5
1.1
2.65
1.2
0.67
0.735
1.4
0.69
0.6
1.445
1.3
1.3
0.765
1.6
1.8
0.78
0.65
1.3
1.2
1.1
1.1
0.54
0.5
0.8
1
SW
0.49
0.8
0.22
0.6
1
1
0.09
1.08
1
0.5
2.2
0.7
0.99
0.65
1.45
1.2
0.3
0.9
3.9
0.675
2.02
0.74
0.5
1.3
0.66
1.15
0.8
0.94
1
0.63
0.725
1.8
0.8
0.7
0.7
0.7
0.84
1
0.7
0.7
90th Percentile Detect
Concentration (u.g/L)
Total
2.87
16
7.46
6.4
6.8
2.8
18.2
35.9
8.15
4.1
4
38
2.4
4.7
2.4
6.6
8.9
11.5
4.6
1.6
7.5
730
5.6
2.02
1.8
15
3
5.26
3.4
12.4
3.65
3.6
48
25
2.18
37.2
3.2
5.3
20.2
5
5.7
3.2
9
3.4
5.4
GW
3.845
6.41
10
6.7
11
3.2
18.2
35.9
8.4
4.25
4.105
38
2.4
4.7
19
7
8.95
19.3
4.9
2.2
11.3
840
5.6
1.43
1.8
15
3.2
5.3
3.8
12.4
3.65
3.9
48
30.5
2.18
37.2
5.5
35.6
5
5.7
3.2
9
4.42
6
SW
2.25
16
0.3
2.5
4.52
2
0.09
1.2
3.2
0.5
3.4
2
1.6
1.5
5.5
3.4
0.7
1.8
4
1.8
2.02
0.74
1.4
2.4
1.4
500
0.9
3.3
1
4.8
0.74
3.2
3.3
1.9
2
0.8
0.84
740
1.7
2.9
Maximum Detect
Concentration (u.g/L)
Total
100
78
296
24
390
830
530
80.1
11
18
22.6
800
19.8
39
40
44
24
55
5100
46
149
1000
170
5.39
3.6
260
820
180
4.9
800
17
45
54.8
110
18.8
37.2
3.2
200
35.6
63
600
57
740
17
5100
GW
43.6
78
296
24
390
830
530
80.1
11
18
22.6
800
19.8
39
40
44
24
55
5100
46
149
1000
170
5.39
3.6
260
820
180
4.9
800
17
45
54.8
110
18.8
37.2
200
35.6
63
600
57
700
17
5100
SW
100
18
0.3
3.1
77
2.3
0.09
1.2
4.6
0.5
3.4
18
1.68
2.1
6.7
3.4
5.2
4.8
4
1.8
2.02
0.74
1.7
2.4
1.4
567
0.9
4.62
1
4.8
0.74
3.2
33
1.9
5
0.8
0.84
740
1.7
740
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A60b. Toluene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
266
454
1,059
3,662
827
1,207
318
1,510
1,822
106
1,056
935
1,429
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
210
771
1,258
1,398
727
338
1,530
1,944
718
1,097
145
819
245
351
4,951
500
1,601
603
1,784
403
304
50,451
GW
474
204
382
1,011
3,145
606
1,168
315
1,484
1,706
94
1,023
878
1,325
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
183
760
1,217
1,361
688
317
1,294
1,819
506
945
136
757
233
162
4,609
454
1,430
560
1,764
243
256
46,193
SW
146
62
72
48
517
221
39
3
26
116
12
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
171
43
20
160
48
4,258
Total Population Served by Systems
Reporting
Total
606,193
4,234,433
2,453,348
6,166,873
35,830,167
4,998,841
2,723,376
698,987
17,495,564
7,485,298
1,293,745
2,543,141
1,093,666
9,217,431
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,748,495
1,698,980
973,592
4,896,835
10,227,597
3,119,686
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,274,208
491,035
4,039,526
1,416,020
446,177
226,955,301
GW
232,590
1,128,788
910,322
2,796,282
13,517,706
531,207
389,454
417,587
15,249,522
1,592,517
1,239,117
1,434,515
837,604
3,017,034
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,712,549
1,432,432
283,701
1,046,233
3,132,660
660,832
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
631,625
227,067
2,347,782
237,670
129,229
86,403,546
SW
373,603
3,105,645
1,543,026
3,370,591
22,312,461
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,642,583
263,968
1,691,744
1,178,350
316,948
140,551,755
Percent of Systems
with At Least One Detection
Total
16.129%
10.526%
4.185%
6.138%
4.588%
6.892%
3.977%
5.975%
2.185%
1.976%
0.000%
3.504%
3.209%
2.099%
4.953%
16.183%
9.610%
8.634%
5.679%
2.961%
10.367%
5.928%
2.241%
5.999%
5.238%
2.464%
11.685%
11.445%
7.428%
7.988%
3.922%
2.829%
6.825%
1.550%
13.103%
2.930%
2.041%
0.855%
7.817%
4.800%
4.310%
9.121%
10.650%
6.203%
7.566%
5.764%
GW
9.494%
10.294%
4.712%
5.638%
4.134%
7.591%
4.110%
6.032%
2.156%
1.993%
0.000%
3.226%
3.303%
2.264%
4.895%
9.783%
9.833%
8.418%
5.680%
2.851%
9.278%
5.522%
2.284%
6.104%
5.464%
2.500%
11.997%
11.315%
7.413%
6.940%
3.555%
2.914%
7.312%
1.587%
11.029%
2.906%
2.146%
0.000%
7.377%
4.405%
4.336%
9.464%
10.714%
7.407%
7.422%
5.535%
SW
37.671%
11.290%
1.389%
16.667%
7.350%
4.977%
0.000%
0.000%
3.846%
1.724%
0.000%
12.121%
1.754%
0.000%
6.818%
20.134%
8.475%
11.765%
5.660%
8.197%
66.667%
12.987%
1.667%
4.317%
3.704%
0.000%
2.439%
16.216%
7.692%
23.810%
5.932%
1.600%
5.660%
1.316%
44.444%
3.226%
0.000%
1.587%
13.743%
8.696%
4.094%
4.651%
5.000%
4.375%
8.333%
8.243%
Percent of Population Served
with At Least One Detection
Total
24.047%
10.957%
1.170%
12.077%
31.809%
6.067%
0.889%
13.325%
3.565%
0.482%
0.000%
9.663%
18.179%
1.282%
3.484%
14.212%
4.637%
42.344%
21.442%
6.152%
20.299%
9.654%
3.436%
16.641%
2.087%
3.906%
6.215%
21.742%
14.923%
43.739%
1.747%
1.419%
4.681%
1.188%
25.730%
12.014%
1.528%
1.774%
18.286%
7.681%
3.223%
6.363%
14.524%
2.743%
3.487%
13.215%
GW
36.289%
18.756%
2.738%
9.305%
11.181%
25.023%
6.217%
22.305%
2.502%
0.866%
0.000%
4.997%
22.059%
3.918%
1.721%
6.367%
10.931%
31.235%
5.430%
19.093%
19.472%
15.059%
5.059%
16.645%
4.505%
8.329%
14.119%
17.870%
9.246%
6.970%
5.178%
2.264%
15.738%
2.229%
32.786%
1.373%
2.096%
0.000%
10.607%
5.012%
12.636%
12.809%
24.937%
2.487%
5.782%
9.361%
SW
16.426%
8.123%
0.245%
14.376%
44.306%
3.813%
0.000%
0.000%
10.780%
0.379%
0.000%
15.702%
5.488%
0.000%
5.438%
14.909%
3.019%
45.193%
32.205%
1.211%
22.291%
2.706%
1.927%
16.639%
0.049%
0.000%
0.478%
23.828%
45.431%
58.859%
0.815%
1.046%
1.709%
0.936%
24.071%
14.986%
0.000%
2.388%
22.801%
12.989%
1.942%
0.818%
0.073%
2.794%
2.552%
15.584%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A60c. Toluene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 1,000 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 1,000 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.034%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.034%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 1,000 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
500
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
500
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
500
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
500
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 1,000 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.0002%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.025%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A60d. Toluene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 600 ug/L
Total
0
0
0
0
0
1
0
0
0
0
0
0
2
0
0
0
0
0
0
4
0
0
2
0
0
0
0
1
0
0
2
0
0
0
0
0
0
0
0
0
0
1
0
2
0
15
GW
0
0
0
0
0
1
0
0
0
0
0
0
2
0
0
0
0
0
0
4
0
0
2
0
0
0
0
1
0
0
2
0
0
0
0
0
0
0
0
0
0
1
0
1
0
14
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
Percent of Systems
with At Least One Detection
> 600 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.121%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.214%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.135%
0.000%
0.000%
0.236%
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.131%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.166%
0.000%
0.496%
0.000%
0.030%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.165%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.228%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.137%
0.000%
0.000%
0.254%
0.000%
0.000%
0.000%
0.000%
0.073%
0.000%
0.000%
0.155%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.179%
0.000%
0.412%
0.000%
0.030%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.625%
0.000%
0.023%
Population Served by Systems
with At Least One Detection
> 600 ug/L
Total
0
0
0
0
0
425
0
0
0
0
0
0
10,137
0
0
0
0
0
0
1,745
0
0
579
0
0
0
0
85
0
0
801
0
0
0
0
0
0
0
0
0
0
1,695
0
1,834
0
17,301
GW
0
0
0
0
0
425
0
0
0
0
0
0
10,137
0
0
0
0
0
0
1,745
0
0
579
0
0
0
0
85
0
0
801
0
0
0
0
0
0
0
0
0
0
1,695
0
222
0
15,689
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1,612
0
1,612
Percent of Population Served
with At Least One Detection
> 600 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.009%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.927%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.024%
0.000%
0.000%
0.076%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.016%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.345%
0.000%
0.130%
0.000%
0.008%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.080%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.210%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.088%
0.000%
0.000%
0.159%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.077%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.746%
0.000%
0.093%
0.000%
0.018%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.137%
0.000%
0.001%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A60e. Toluene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 500 ug/L
Total
0
0
0
0
0
1
1
0
0
0
0
0
2
0
0
0
0
0
0
4
0
0
2
0
0
0
0
1
0
0
4
0
0
0
0
0
0
0
0
0
0
1
0
2
0
18
GW
0
0
0
0
0
1
1
0
0
0
0
0
2
0
0
0
0
0
0
4
0
0
2
0
0
0
0
1
0
0
2
0
0
0
0
0
0
0
0
0
0
1
0
1
0
15
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
1
0
3
Percent of Systems
with At Least One Detection
> 500 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.121%
0.083%
0.000%
0.000%
0.000%
0.000%
0.000%
0.214%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.135%
0.000%
0.000%
0.236%
0.000%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.261%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.166%
0.000%
0.496%
0.000%
0.036%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.165%
0.086%
0.000%
0.000%
0.000%
0.000%
0.000%
0.228%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.137%
0.000%
0.000%
0.254%
0.000%
0.000%
0.000%
0.000%
0.073%
0.000%
0.000%
0.155%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.179%
0.000%
0.412%
0.000%
0.032%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.847%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.625%
0.000%
0.070%
Population Served by Systems
with At Least One Detection
> 500 ug/L
Total
0
0
0
0
0
425
68
0
0
0
0
0
10,137
0
0
0
0
0
0
1,745
0
0
579
0
0
0
0
85
0
0
5,401
0
0
0
0
0
0
0
0
0
0
1,695
0
1,834
0
21,969
GW
0
0
0
0
0
425
68
0
0
0
0
0
10,137
0
0
0
0
0
0
1,745
0
0
579
0
0
0
0
85
0
0
801
0
0
0
0
0
0
0
0
0
0
1,695
0
222
0
15,757
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4,600
0
0
0
0
0
0
0
0
0
0
0
0
1,612
0
6,212
Percent of Population Served
with At Least One Detection
> 500 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.009%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.927%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.024%
0.000%
0.000%
0.076%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.110%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.345%
0.000%
0.130%
0.000%
0.010%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.080%
0.017%
0.000%
0.000%
0.000%
0.000%
0.000%
1.210%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.088%
0.000%
0.000%
0.159%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.077%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.746%
0.000%
0.093%
0.000%
0.018%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.119%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.137%
0.000%
0.004%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A61. Toxaphene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 3 ug/L
> 1.5 ug/L
>lug/L
> 3 ug/L
> 1.5 ug/L
>lug/L
> 3 ug/L
> 1.5 ug/L
>lug/L
Total # Systems
Reporting
27,718
27,718
27,718
2,669
2,669
2,669
30,387
30,387
30,387
# Systems Exceeding
Threshold of Interest
5
7
7
0
2
2
5
9
9
% Systems Exceeding
Threshold of Interest
0.018%
0.025%
0.025%
0.000%
0.075%
0.075%
0.016%
0.030%
0.030%
Total Pop. Served by
Systems Reporting
60,886,049
60,886,049
60,886,049
99,126,085
99,126,085
99,126,085
160,012,134
160,012,134
160,012,134
Total Pop. Served by
Systems Exceeding
Threshold of Interest
27,063
27,713
27,713
0
257,737
257,737
27,063
285,450
285,450
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.044%
0.046%
0.046%
0.000%
0.260%
0.260%
0.017%
0.178%
0.178%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A61a. Toxaphene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
66
499
1,664
6,809
12,542
2,524
1,774
275
2,376
1,429
1,946
42
1,732
4,676
2,229
1,713
2,966
428
387
6,875
4,761
5,237
2,992
13,219
409
1,355
4,193
5
4,335
1,523
2,879
192
2,052
598
2,920
953
65
770
7,110
500
1,283
3,177
645
1,278
115,403
GW
46
370
1,423
5,378
7,285
1,823
1,184
257
2,311
1,350
1,849
29
1,476
3,944
2,063
439
2,189
76
339
6,423
4,620
4,499
2,691
12,111
341
1,320
3,874
5
4,086
1,141
2,169
75
1,569
411
2,527
844
12
753
5,922
178
1,095
3,082
335
958
94,872
SW
20
129
241
1,431
5,257
701
590
18
65
79
97
13
256
732
166
1,274
111
352
48
452
141
738
301
1,108
68
35
319
0
249
382
710
117
483
187
393
109
53
17
1,188
322
188
95
310
320
20,531
Percent of Samples
with Detections
Total
0.000%
0.000%
0.060%
0.000%
0.000%
0.000%
0.451%
0.000%
0.505%
0.280%
0.000%
0.000%
0.000%
0.000%
0.000%
0.350%
0.135%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.227%
0.000%
0.000%
0.000%
0.000%
0.046%
0.000%
0.035%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.078%
0.000%
1.860%
0.000%
0.070%
GW
0.000%
0.000%
0.070%
0.000%
0.000%
0.000%
0.084%
0.000%
0.519%
0.296%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.046%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.239%
0.000%
0.000%
0.000%
0.000%
0.049%
0.000%
0.046%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.091%
0.000%
2.090%
0.000%
0.062%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.186%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.471%
0.386%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.090%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.613%
0.000%
0.107%
Minimum Detect
Concentration (u.g/L)
Total
0.2
1
0.04
5
0.07
1
1
0.15
0.1
0.5
0.1
0.04
GW
0.2
2
0.04
5
1
1
0.15
0.1
0.5
0.24
0.04
SW
1
0.07
1
1.72
0.1
0.07
Median Detect
Concentration (u.g/L)
Total
0.2
1
0.04
5
1.5
1
3.465
0.32
0.1
0.5
0.34
1
GW
0.2
2
0.04
5
1
3.63
0.32
0.1
0.5
0.24
1.5
SW
1
1.5
1
1.72
0.34
1
90th Percentile Detect
Concentration (u.g/L)
Total
0.2
2
0.1
5
2.5
1
5.1
0.49
0.1
0.5
0.5
4.9
GW
0.2
2
0.1
5
1
5.3
0.49
0.1
0.5
0.34
5
SW
1
2.5
1
1.72
1
2.5
Maximum Detect
Concentration (u.g/L)
Total
0.2
2
0.9
5
2.5
1
6.8
0.49
0.1
0.5
1
6.8
GW
0.2
2
0.9
5
1
6.8
0.49
0.1
0.5
0.34
6.8
SW
1
2.5
1
1.72
1
2.5
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A61b. Toxaphene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
15
171
450
949
1,593
812
663
115
1,309
294
100
4
716
1,371
1,401
242
644
72
228
2,935
1,287
1,384
813
2,365
209
692
1,237
2
694
288
1,348
46
1,084
85
775
261
13
617
427
182
438
1,410
342
304
30,387
GW
10
126
379
901
1,307
593
625
112
1,288
280
88
3
670
1,267
1,357
93
527
39
204
2,874
1,258
1,308
753
2,228
182
681
1,196
2
658
267
1,117
36
934
76
716
240
6
609
390
71
405
1,390
196
256
27,718
SW
5
45
71
48
286
219
38
3
21
14
12
1
46
104
44
149
117
33
24
61
29
76
60
137
27
11
41
0
36
21
231
10
150
9
59
21
7
8
37
111
33
20
146
48
2,669
Total Population Served by Systems
Reporting
Total
24,205
2,702,037
2,447,627
6,081,248
33,236,213
4,992,325
2,596,535
480,758
16,785,212
990,475
1,256,886
162,197
978,793
9,186,700
4,866,641
4,602,489
8,485,078
4,101,506
473,968
7,227,231
3,934,332
2,624,615
753,259
6,885,177
559,198
1,442,549
945,754
6,121
1,662,842
960,034
4,924,818
3,527,456
2,937,104
901,461
3,436,445
622,272
675,214
508,429
2,500,736
2,391,215
436,614
3,883,918
1,368,270
446,177
160,012,134
GW
14,306
589,449
905,863
2,710,657
11,569,633
525,416
262,648
199,358
14,546,036
298,453
1,202,258
27,580
742,327
2,986,303
2,546,905
375,460
1,682,696
149,836
103,532
2,047,375
2,684,691
1,680,154
360,590
1,733,551
253,973
666,069
395,955
6,121
1,399,944
270,143
981,541
136,924
572,354
161,483
809,662
263,101
145,112
469,714
1,667,550
30,317
185,450
2,192,174
204,156
129,229
60,886,049
SW
9,899
2,112,588
1,541,764
3,370,591
21,666,580
4,466,909
2,333,887
281,400
2,239,176
692,022
54,628
134,617
236,466
6,200,397
2,319,736
4,227,029
6,802,382
3,951,670
370,436
5,179,856
1,249,641
944,461
392,669
5,151,626
305,225
776,480
549,799
0
262,898
689,891
3,943,277
3,390,532
2,364,750
739,978
2,626,783
359,171
530,102
38,715
833,186
2,360,898
251,164
1,691,744
1,164,114
316,948
99,126,085
Percent of Systems
with At Least One Detection
Total
0.000%
0.000%
0.222%
0.000%
0.000%
0.000%
0.754%
0.000%
0.458%
1.361%
0.000%
0.000%
0.000%
0.000%
0.000%
1.653%
0.466%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.127%
0.000%
0.000%
0.000%
0.000%
0.288%
0.000%
0.074%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.228%
0.000%
2.924%
0.000%
0.132%
GW
0.000%
0.000%
0.264%
0.000%
0.000%
0.000%
0.160%
0.000%
0.466%
1.429%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.190%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.090%
0.000%
0.000%
0.000%
0.000%
0.304%
0.000%
0.090%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.247%
0.000%
3.571%
0.000%
0.094%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
10.526%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.685%
1.709%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.730%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.055%
0.000%
0.525%
Percent of Population Served
with At Least One Detection
Total
0.000%
0.000%
0.201%
0.000%
0.000%
0.000%
17.142%
0.000%
15.517%
2.702%
0.000%
0.000%
0.000%
0.000%
0.000%
8.236%
0.740%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.055%
0.000%
0.000%
0.000%
0.000%
0.022%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.071%
0.000%
0.789%
0.000%
2.211%
GW
0.000%
0.000%
0.544%
0.000%
0.000%
0.000%
0.168%
0.000%
17.905%
8.968%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.351%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.029%
0.000%
0.000%
0.000%
0.000%
0.026%
0.000%
0.006%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.166%
0.000%
0.640%
0.000%
4.344%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
19.052%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
8.967%
0.836%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.064%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.815%
0.000%
0.901%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A61c. Toxaphene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 3 ug/L
Total
0
0
0
0
0
0
0
0
0
4
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5
GW
0
0
0
0
0
0
0
0
0
4
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 3 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.361%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.042%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.016%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.429%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.045%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.018%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 3 ug/L
Total
0
0
0
0
0
0
0
0
0
26,765
0
0
0
0
0
0
0
0
0
0
0
0
0
298
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
27,063
GW
0
0
0
0
0
0
0
0
0
26,765
0
0
0
0
0
0
0
0
0
0
0
0
0
298
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
27,063
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 3 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.702%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.017%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
8.968%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.017%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.044%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A61d. Toxaphene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 1.5 ug/L
Total
0
0
0
0
0
0
1
0
0
4
0
0
0
0
0
1
0
0
0
0
0
0
0
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
9
GW
0
0
0
0
0
0
1
0
0
4
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
Percent of Systems
with At Least One Detection
> 1.5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.151%
0.000%
0.000%
1.361%
0.000%
0.000%
0.000%
0.000%
0.000%
0.413%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.127%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.030%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.160%
0.000%
0.000%
1.429%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.090%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.025%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.730%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.075%
Population Served by Systems
with At Least One Detection
> 1.5 ug/L
Total
0
0
0
0
0
0
440
0
0
26,765
0
0
0
0
0
254,462
0
0
0
0
0
0
0
3,783
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
285,450
GW
0
0
0
0
0
0
440
0
0
26,765
0
0
0
0
0
0
0
0
0
0
0
0
0
508
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
27,713
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
254,462
0
0
0
0
0
0
0
3,275
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
257,737
Percent of Population Served
with At Least One Detection
> 1.5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.017%
0.000%
0.000%
2.702%
0.000%
0.000%
0.000%
0.000%
0.000%
5.529%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.055%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.178%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.168%
0.000%
0.000%
8.968%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.029%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.046%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.020%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.064%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.260%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A61e. Toxaphene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>lug/L
Total
0
0
0
0
0
0
1
0
0
4
0
0
0
0
0
1
0
0
0
0
0
0
0
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
9
GW
0
0
0
0
0
0
1
0
0
4
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
Percent of Systems
with At Least One Detection
> 1 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.151%
0.000%
0.000%
1.361%
0.000%
0.000%
0.000%
0.000%
0.000%
0.413%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.127%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.030%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.160%
0.000%
0.000%
1.429%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.090%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.025%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.730%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.075%
Population Served by Systems
with At Least One Detection
>lug/L
Total
0
0
0
0
0
0
440
0
0
26,765
0
0
0
0
0
254,462
0
0
0
0
0
0
0
3,783
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
285,450
GW
0
0
0
0
0
0
440
0
0
26,765
0
0
0
0
0
0
0
0
0
0
0
0
0
508
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
27,713
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
254,462
0
0
0
0
0
0
0
3,275
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
257,737
Percent of Population Served
with At Least One Detection
>lug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.017%
0.000%
0.000%
2.702%
0.000%
0.000%
0.000%
0.000%
0.000%
5.529%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.055%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.178%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.168%
0.000%
0.000%
8.968%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.029%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.046%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.020%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.064%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.260%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A62. 1,2,4-Trichlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 70 ug/L
> 35 ug/L
> 70 ug/L
> 35 ug/L
> 70 ug/L
> 35 ug/L
Total # Systems
Reporting
45,887
45,887
4,248
4,248
50,135
50,135
# Systems Exceeding
Threshold of Interest
0
2
0
0
0
2
% Systems Exceeding
Threshold of Interest
0.000%
0.004%
0.000%
0.000%
0.000%
0.004%
Total Pop. Served by
Systems Reporting
86,306,318
86,306,318
140,535,784
140,535,784
226,842,102
226,842,102
Total Pop. Served by
Systems Exceeding
Threshold of Interest
0
2,131
0
0
0
2,131
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.002%
0.000%
0.000%
0.000%
0.001%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A62a. 1,2,4-Trichlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,113
820
2,383
11,713
84,520
2,871
6,937
1,047
4,143
7,176
1,789
1,762
3,764
6,523
4,621
3,312
16,249
6,768
3,696
10,753
8,581
7,544
4,493
19,035
543
6,844
9,581
20,349
6,577
3,209
7,099
8,828
5,638
2,324
1,957
4,324
889
2,946
34,148
8,981
4,928
4,271
11,293
1,134
1,656
371,132
GW
1,976
596
1,915
9,543
44,744
2,131
6,046
1,017
4,075
6,349
1,686
1,637
3,303
5,969
4,311
1,125
12,259
5,506
3,381
9,743
7,332
6,695
3,953
17,455
411
6,265
9,103
18,561
6,101
2,576
5,429
7,672
4,202
1,682
1,589
3,787
855
1,166
27,042
7,555
4,055
3,884
11,168
443
1,153
287,446
SW
1,137
224
468
2,170
39,776
740
891
30
68
827
103
125
461
554
310
2,187
3,990
1,262
315
1,010
1,249
849
540
1,580
132
579
478
1,788
476
633
1,670
1,156
1,436
642
368
537
34
1,780
7,106
1,426
873
387
125
691
503
83,686
Percent of Samples
with Detections
Total
0.128%
0.000%
0.504%
0.034%
0.012%
0.383%
0.086%
0.000%
0.169%
0.000%
0.000%
0.000%
0.000%
0.015%
0.022%
0.332%
0.006%
0.044%
0.000%
0.000%
0.000%
0.080%
0.000%
0.079%
0.000%
0.000%
0.073%
0.074%
0.046%
0.031%
0.099%
0.068%
0.018%
0.043%
0.000%
0.023%
0.112%
0.000%
0.061%
0.000%
0.264%
0.023%
0.027%
1.499%
0.000%
0.051%
GW
0.152%
0.000%
0.522%
0.010%
0.011%
0.469%
0.099%
0.000%
0.172%
0.000%
0.000%
0.000%
0.000%
0.017%
0.023%
0.000%
0.008%
0.054%
0.000%
0.000%
0.000%
0.090%
0.000%
0.086%
0.000%
0.000%
0.077%
0.075%
0.049%
0.039%
0.092%
0.078%
0.000%
0.059%
0.000%
0.026%
0.117%
0.000%
0.055%
0.000%
0.321%
0.026%
0.027%
2.709%
0.000%
0.053%
SW
0.088%
0.000%
0.427%
0.138%
0.013%
0.135%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.503%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.056%
0.000%
0.000%
0.120%
0.000%
0.070%
0.000%
0.000%
0.000%
0.000%
0.000%
0.084%
0.000%
0.000%
0.000%
0.000%
0.724%
0.000%
0.045%
Minimum Detect
Concentration (u.g/L)
Total
0.25
0.11
0.5
0.53
0.04
0.7
0.09
0.65
6.5
0.003
1
0.6
0.5
0.5
0.5
0.05
0.2
5.5
0.5
0.5
0.91
0.61
0.56
0.66
0.5
0.6
0.95
0.02
0.24
0.003
GW
0.38
0.11
0.5
0.6
0.04
0.7
0.09
0.65
6.5
1
0.6
0.5
0.5
0.5
0.05
0.2
5.5
0.5
0.5
0.61
0.56
0.66
0.5
0.6
0.95
0.02
0.24
0.02
SW
0.25
0.11
0.5
0.53
0.05
0.003
0.7
0.5
0.91
0.6
0.4
0.003
Median Detect
Concentration (u.g/L)
Total
0.61
0.135
0.5
1.3
0.08
1
0.12
0.65
6.5
0.12
1
1.8
0.725
1.2
0.76
0.35
0.3
5.5
0.5
1.82
0.91
0.61
0.56
0.66
0.7
0.9
0.95
0.37
0.5
0.6
GW
0.84
0.135
0.5
0.84
0.08
1
0.12
0.65
6.5
1
1.8
0.725
1.2
0.76
0.34
0.3
5.5
0.5
1.82
0.61
0.56
0.66
0.6
0.9
0.95
0.37
0.5
0.6
SW
0.25
0.175
0.5
1.4
0.05
0.12
0.7
0.5
0.91
0.8
0.5
0.5
90th Percentile Detect
Concentration (u.g/L)
Total
2.9
0.24
0.5
6.1
0.52
1.1
0.5
0.65
6.5
0.5
1
1.9
1.22
70
2.9
0.99
0.5
5.5
9.5
9.3
0.91
0.61
0.56
0.66
2.74
1.5
0.95
0.8
1
2.2
GW
2.9
0.26
0.5
2.2
0.61
1.1
0.5
0.65
6.5
1
1.9
1.22
70
2.9
0.99
0.5
5.5
9.5
9.3
0.61
0.56
0.66
2.82
1.5
0.95
0.8
0.5
2.74
SW
0.25
0.24
0.5
10
0.05
0.5
0.7
0.5
0.91
0.9
1
1.2
Maximum Detect
Concentration (u.g/L)
Total
2.9
0.29
0.5
10
0.7
1.1
0.5
0.65
6.5
1
1
1.9
1.22
70
2.9
1
0.5
5.5
9.5
9.3
0.91
0.61
0.56
0.66
2.82
1.7
0.95
0.8
4.97
70
GW
2.9
0.29
0.5
2.2
0.7
1.1
0.5
0.65
6.5
1
1.9
1.22
70
2.9
1
0.5
5.5
9.5
9.3
0.61
0.56
0.66
2.82
1.7
0.95
0.8
4.97
70
SW
0.25
0.24
0.5
10
0.05
1
0.7
0.5
0.91
0.9
1
10
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A62b. 1,2,4-Trichlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
263
454
1,059
3,595
826
1,207
318
1,510
1,822
106
1,056
935
1,184
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
209
771
1,258
1,398
727
338
1,525
1,944
730
1,097
145
817
245
351
4,951
500
1,600
603
1,784
400
304
50,135
GW
474
202
382
1,011
3,083
605
1,168
315
1,484
1,706
94
1,023
878
1,084
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
182
760
1,217
1,361
688
317
1,289
1,819
518
945
136
755
233
162
4,609
454
1,429
560
1,764
240
256
45,887
SW
146
61
72
48
512
221
39
3
26
116
12
33
57
100
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
171
43
20
160
48
4,248
Total Population Served by Systems
Reporting
Total
606,193
4,218,278
2,453,348
6,166,873
35,819,126
4,997,841
2,723,376
698,987
17,495,564
7,485,298
1,293,745
2,543,141
1,093,666
9,132,188
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,332
1,462,181
948,788
7,748,495
1,698,980
973,592
4,895,099
10,227,597
3,123,687
2,940,119
913,884
3,356,049
266,416
5,685,258
25,111,902
2,553,197
5,273,258
491,035
4,039,526
1,415,792
446,177
226,842,102
GW
232,590
1,123,190
910,322
2,796,282
13,507,460
530,207
389,454
417,587
15,249,522
1,592,517
1,239,117
1,434,515
837,604
2,936,410
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,107
685,701
398,989
2,712,549
1,432,432
283,701
1,044,497
3,132,660
664,833
574,689
173,906
732,097
194,218
1,462,502
9,297,171
1,698,877
630,675
227,067
2,347,782
237,442
129,229
86,306,318
SW
373,603
3,095,088
1,543,026
3,370,591
22,311,666
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,195,778
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,642,583
263,968
1,691,744
1,178,350
316,948
140,535,784
Percent of Systems
with At Least One Detection
Total
0.645%
0.000%
2.643%
0.189%
0.250%
1.090%
0.083%
0.000%
0.331%
0.000%
0.000%
0.000%
0.000%
0.084%
0.068%
2.075%
0.139%
0.190%
0.000%
0.000%
0.000%
0.423%
0.000%
0.634%
0.000%
0.000%
0.556%
1.073%
0.413%
0.296%
0.459%
0.309%
0.137%
0.091%
0.000%
0.122%
0.408%
0.000%
0.323%
0.000%
0.563%
0.166%
0.168%
4.000%
0.000%
0.321%
GW
0.633%
0.000%
2.618%
0.099%
0.130%
1.322%
0.086%
0.000%
0.337%
0.000%
0.000%
0.000%
0.000%
0.092%
0.070%
0.000%
0.167%
0.203%
0.000%
0.000%
0.000%
0.448%
0.000%
0.673%
0.000%
0.000%
0.575%
1.029%
0.436%
0.315%
0.388%
0.330%
0.000%
0.106%
0.000%
0.132%
0.429%
0.000%
0.260%
0.000%
0.630%
0.179%
0.170%
5.000%
0.000%
0.292%
SW
0.685%
0.000%
2.778%
2.083%
0.977%
0.452%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.356%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.703%
0.000%
0.000%
0.847%
0.000%
0.472%
0.000%
0.000%
0.000%
0.000%
0.000%
1.170%
0.000%
0.000%
0.000%
0.000%
2.500%
0.000%
0.636%
Percent of Population Served
with At Least One Detection
Total
0.175%
0.000%
1.673%
4.877%
1.379%
0.145%
0.001%
0.000%
1.824%
0.000%
0.000%
0.000%
0.000%
0.005%
0.001%
7.905%
0.289%
0.000%
0.000%
0.000%
0.000%
0.559%
0.000%
0.062%
0.000%
0.000%
0.372%
1.789%
5.015%
0.003%
0.097%
0.042%
0.063%
0.002%
0.000%
0.003%
0.176%
0.000%
0.647%
0.000%
0.089%
0.018%
0.034%
2.503%
0.000%
0.889%
GW
0.226%
0.000%
3.769%
0.026%
0.967%
1.326%
0.007%
0.000%
2.093%
0.000%
0.000%
0.000%
0.000%
0.017%
0.002%
0.000%
1.413%
0.002%
0.000%
0.000%
0.000%
0.993%
0.000%
0.249%
0.000%
0.000%
0.885%
3.525%
5.948%
0.009%
0.423%
0.138%
0.000%
0.011%
0.000%
0.016%
0.242%
0.000%
0.404%
0.000%
0.742%
0.040%
0.058%
1.177%
0.000%
0.903%
SW
0.143%
0.000%
0.437%
8.901%
1.628%
0.005%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
8.607%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.854%
0.000%
0.000%
0.008%
0.000%
0.080%
0.000%
0.000%
0.000%
0.000%
0.000%
0.790%
0.000%
0.000%
0.000%
0.000%
2.770%
0.000%
0.880%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A62c. 1,2,4-Trichlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 70 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 70 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 70 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 70 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A62d. 1,2,4-Trichlorobenzene — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 35 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 35 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.084%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.090%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 35 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2,131
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2,131
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2,131
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2,131
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 35 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.030%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.123%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A63. 1,1,1-Trichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 200 ug/L
> 100 ug/L
> 200 ug/L
> 100 ug/L
> 200 ug/L
> 100 ug/L
Total # Systems
Reporting
46,183
46,183
4,257
4,257
50,440
50,440
# Systems Exceeding
Threshold of Interest
2
2
0
0
2
2
% Systems Exceeding
Threshold of Interest
0.004%
0.004%
0.000%
0.000%
0.004%
0.004%
Total Pop. Served by
Systems Reporting
86,390,348
86,390,348
140,541,198
140,541,198
226,931,546
226,931,546
Total Pop. Served by
Systems Exceeding
Threshold of Interest
226
226
0
0
226
226
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A63a. 1,1,1-Trichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,105
850
2,394
12,599
86,649
2,874
6,938
1,048
4,147
7,176
1,792
1,789
3,764
7,030
4,621
3,313
16,249
6,772
3,698
10,754
8,582
7,544
4,495
19,068
552
6,844
9,600
20,364
6,577
3,209
7,092
8,856
5,636
2,327
1,959
4,342
889
2,946
34,146
8,990
4,930
4,350
11,292
1,140
1,658
374,950
GW
1,968
626
1,926
9,548
45,586
2,134
6,047
1,019
4,079
6,349
1,689
1,660
3,303
6,464
4,311
1,126
12,259
5,510
3,383
9,744
7,333
6,695
3,956
17,488
417
6,265
9,115
18,576
6,101
2,577
5,424
7,694
4,201
1,685
1,591
3,803
855
1,166
27,042
7,559
4,057
3,956
11,167
444
1,155
289,053
SW
1,137
224
468
3,051
41,063
740
891
29
68
827
103
129
461
566
310
2,187
3,990
1,262
315
1,010
1,249
849
539
1,580
135
579
485
1,788
476
632
1,668
1,162
1,435
642
368
539
34
1,780
7,104
1,431
873
394
125
696
503
85,897
Percent of Samples
with Detections
Total
1.127%
4.235%
0.084%
0.087%
1.144%
0.070%
2.681%
0.286%
0.096%
0.111%
0.000%
1.062%
0.213%
2.575%
1.536%
0.483%
1.612%
1.270%
1.001%
0.567%
0.839%
0.066%
0.311%
0.273%
0.725%
0.687%
0.771%
2.932%
0.334%
0.530%
0.874%
0.926%
0.035%
1.031%
1.940%
0.184%
0.225%
0.170%
0.056%
0.000%
0.385%
0.920%
2.993%
4.035%
0.181%
0.963%
GW
1.677%
5.751%
0.104%
0.063%
0.847%
0.094%
2.431%
0.294%
0.098%
0.126%
0.000%
0.843%
0.242%
2.800%
1.647%
1.066%
1.746%
1.053%
1.094%
0.626%
0.955%
0.075%
0.354%
0.280%
0.959%
0.750%
0.669%
2.988%
0.361%
0.660%
1.088%
1.053%
0.024%
1.424%
2.388%
0.210%
0.234%
0.429%
0.067%
0.000%
0.468%
1.011%
3.018%
7.432%
0.260%
0.967%
SW
0.176%
0.000%
0.000%
0.164%
1.473%
0.000%
4.377%
0.000%
0.000%
0.000%
0.000%
3.876%
0.000%
0.000%
0.000%
0.183%
1.203%
2.219%
0.000%
0.000%
0.160%
0.000%
0.000%
0.190%
0.000%
0.000%
2.680%
2.349%
0.000%
0.000%
0.180%
0.086%
0.070%
0.000%
0.000%
0.000%
0.000%
0.000%
0.014%
0.000%
0.000%
0.000%
0.800%
1.868%
0.000%
0.950%
Minimum Detect
Concentration (u.g/L)
Total
0.3
0.5
0.2
0.5
0.5
0.51
0.5
0.5
0.08
0.5
0.5
0.3
0.5
0.5
0.1
0.4
0.2
0.48
0.4
0.2
0.6
0.59
0.5
1.22
0.17
0.009
0.04
0.2
0.1
0.4
0.5
0.5
0.5
0.4
0.54
0.51
0.5
0.5
0.8
0.3
0.03
0.17
0.5
0.009
GW
0.3
0.5
0.2
0.6
0.5
0.51
0.5
0.5
0.08
0.5
0.5
0.3
0.5
0.5
0.1
0.4
0.4
0.48
0.4
0.2
0.6
0.59
0.5
1.22
0.17
0.009
0.04
0.2
0.1
0.4
0.5
0.5
0.5
0.4
0.54
0.51
0.5
0.5
0.8
0.3
0.03
0.17
0.5
0.009
SW
0.34
0.5
0.5
0.5
0.6
0.5
0.5
0.2
0.2
0.57
0.57
0.2
0.5
0.59
0.6
7.8
0.41
0.4
0.2
Median Detect
Concentration (u.g/L)
Total
1.3
0.795
0.825
0.7
1
0.555
1.615
0.51
0.21
0.595
2.1
0.53
1.4
1.9
0.5
1
1
0.9
0.6
0.5
0.8
2.95
1.215
3.9
1.08
1.2
0.82
0.5
0.67
1.15
1.5
0.55
0.685
0.8
3.76
1.335
0.8
0.8
2.1
0.855
0.55
1.55
0.7
1
GW
1.34
0.795
0.825
0.75
1.2
0.555
1.8
0.51
0.21
0.595
3.75
0.53
1.4
1.9
0.45
1
0.9
0.9
0.6
0.5
0.8
2.95
1.26
3.9
1.08
1.29
0.88
0.5
0.67
1.3
1.5
0.5
0.685
0.8
3.76
1.335
0.8
0.77
2.1
0.855
0.55
2.8
0.7
1
SW
0.34
0.5
0.99
1.4
0.7
0.5
1
3.5
0.25
0.6
1
0.6
0.5
0.59
0.6
7.8
0.41
1
0.97
90th Percentile Detect
Concentration (u.g/L)
Total
15.4
1.4
1.45
2
4.7
0.6
8.79
1.67
0.42
0.9
6.1
7.2
5.3
8.5
3.2
11
5.6
16
1.8
2.4
0.9
16
11
9.17
5.5
2.38
3.77
2.1
1.4
6.9
6.1
0.6
1
2
7
2.16
1.6
2.7
6.7
2.9
6.3
4.4
8.02
5.2
GW
15.4
1.4
1.45
2
7.5
0.6
10.6
1.67
0.42
0.9
6.1
7.2
5.3
8.5
3.2
14
2.8
16
1.8
2.4
0.9
16
12.8
9.17
5.5
2.3
3.98
2.1
1.4
7.2
6.1
0.5
1
2
7
2.16
1.6
2.6
6.7
2.9
6.3
4.4
8.02
5.6
SW
0.34
4.2
4.1
3.3
0.7
1
6.3
6.4
0.3
0.6
9.2
1
0.5
0.59
0.6
7.8
0.41
2
4.3
Maximum Detect
Concentration (u.g/L)
Total
39.6
2.4
1.45
4.2
92
0.6
29.8
1.67
0.42
0.9
8.2
7.2
1400
60
3.3
63
38
31
4.1
4.7
0.9
29
44.6
9.17
16
9.5
11.8
3
6.01
500
68.9
0.6
1.7
6
7
2.16
1.6
7.8
11
4.3
34
6
8.02
1400
GW
39.6
2.4
1.45
2
14
0.6
29.8
1.67
0.42
0.9
8.2
7.2
1400
60
3.3
63
38
31
4.1
4.7
0.9
29
44.6
9.17
16
8.1
11.8
3
6.01
500
68.9
0.5
1.7
6
7
2.16
1.6
2.7
11
4.3
34
5.5
8.02
1400
SW
0.34
4.2
92
4.3
0.7
1
14.9
17.6
0.3
0.6
9.5
1.9
0.5
0.59
0.6
7.8
0.41
6
92
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A63b. 1,1,1-Trichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
263
454
1,059
3,653
826
1,207
318
1,509
1,822
106
1,056
935
1,430
1,472
241
718
1,054
810
2,972
1,582
1,417
848
2,367
210
771
1,258
1,398
727
338
1,524
1,944
730
1,097
145
819
245
351
4,951
500
1,599
603
1,784
403
304
50,440
GW
474
202
382
1,011
3,136
605
1,168
315
1,483
1,706
94
1,023
878
1,326
1,428
92
600
986
757
2,911
1,552
1,340
788
2,228
183
760
1,217
1,361
688
317
1,288
1,819
518
945
136
757
233
162
4,609
454
1,428
560
1,764
243
256
46,183
SW
146
61
72
48
517
221
39
3
26
116
12
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
171
43
20
160
48
4,257
Total Population Served by Systems
Reporting
Total
606,193
4,218,278
2,453,348
6,166,873
35,828,228
4,997,841
2,723,376
698,987
17,495,514
7,485,298
1,293,745
2,543,141
1,093,666
9,217,581
4,885,505
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,748,495
1,698,980
973,592
4,894,939
10,227,597
3,123,687
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,273,058
491,035
4,039,526
1,416,020
446,177
226,931,546
GW
232,590
1,123,190
910,322
2,796,282
13,515,767
530,207
389,454
417,587
15,249,472
1,592,517
1,239,117
1,434,515
837,604
3,017,184
2,565,769
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,712,549
1,432,432
283,701
1,044,337
3,132,660
664,833
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
630,475
227,067
2,347,782
237,670
129,229
86,390,348
SW
373,603
3,095,088
1,543,026
3,370,591
22,312,461
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,642,583
263,968
1,691,744
1,178,350
316,948
140,541,198
Percent of Systems
with At Least One Detection
Total
1.452%
1.521%
0.441%
0.567%
0.602%
0.242%
1.823%
0.314%
0.265%
0.055%
0.000%
0.473%
0.642%
0.909%
1.155%
2.490%
4.596%
1.613%
0.988%
0.538%
1.454%
0.282%
0.354%
1.098%
0.952%
1.038%
1.908%
6.795%
0.963%
1.183%
1.444%
0.772%
0.274%
0.182%
4.828%
0.244%
0.816%
0.285%
0.121%
0.000%
0.250%
1.161%
3.307%
4.963%
0.987%
1.075%
GW
1.688%
1.980%
0.524%
0.297%
0.415%
0.331%
1.627%
0.317%
0.270%
0.059%
0.000%
0.391%
0.683%
0.980%
1.190%
2.174%
4.500%
1.217%
1.057%
0.550%
1.418%
0.299%
0.381%
1.032%
1.093%
1.053%
1.726%
6.539%
1.017%
1.262%
1.475%
0.770%
0.193%
0.212%
5.147%
0.264%
0.858%
0.617%
0.108%
0.000%
0.280%
1.250%
3.288%
6.584%
1.172%
1.052%
SW
0.685%
0.000%
0.000%
6.250%
1.741%
0.000%
7.692%
0.000%
0.000%
0.000%
0.000%
3.030%
0.000%
0.000%
0.000%
2.685%
5.085%
7.353%
0.000%
0.000%
3.333%
0.000%
0.000%
2.158%
0.000%
0.000%
7.317%
16.216%
0.000%
0.000%
1.271%
0.800%
0.472%
0.000%
0.000%
0.000%
0.000%
0.000%
0.292%
0.000%
0.000%
0.000%
5.000%
2.500%
0.000%
1.315%
Percent of Population Served
with At Least One Detection
Total
8.233%
0.773%
0.187%
8.667%
19.948%
0.003%
6.306%
0.044%
0.753%
0.001%
0.000%
3.172%
0.126%
2.144%
4.710%
2.477%
4.691%
35.327%
2.213%
0.754%
4.624%
0.201%
0.074%
0.873%
9.587%
4.826%
9.181%
30.649%
0.194%
2.770%
7.693%
0.393%
0.049%
1.041%
2.953%
0.020%
0.349%
0.027%
0.033%
0.000%
0.010%
1.081%
12.784%
3.436%
0.334%
6.559%
GW
21.443%
2.904%
0.503%
1.938%
6.400%
0.024%
6.725%
0.073%
0.864%
0.003%
0.000%
5.292%
0.164%
6.551%
8.968%
1.236%
17.877%
4.799%
5.506%
2.730%
6.185%
0.357%
0.154%
0.485%
20.966%
10.290%
6.543%
21.470%
0.230%
9.505%
10.081%
1.281%
0.024%
5.325%
15.519%
0.093%
0.479%
0.104%
0.033%
0.000%
0.085%
2.337%
20.526%
2.033%
1.155%
4.369%
SW
0.009%
0.000%
0.000%
14.250%
28.155%
0.000%
6.236%
0.000%
0.000%
0.000%
0.000%
0.430%
0.000%
0.000%
0.000%
2.587%
1.302%
43.156%
0.000%
0.000%
0.862%
0.000%
0.000%
1.001%
0.000%
0.000%
11.095%
35.594%
0.000%
0.000%
7.045%
0.001%
0.055%
0.000%
0.000%
0.000%
0.000%
0.000%
0.032%
0.000%
0.000%
0.000%
2.039%
3.718%
0.000%
7.905%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A63c. 1,1,1-Trichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 200 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 200 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.070%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.066%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.075%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.078%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 200 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
150
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
76
0
0
0
0
0
0
0
0
0
0
0
0
0
0
226
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
150
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
76
0
0
0
0
0
0
0
0
0
0
0
0
0
0
226
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 200 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.0001%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.005%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A63d. 1,1,1-Trichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 100 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 100 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.070%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.066%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.075%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.078%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.004%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 100 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
150
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
76
0
0
0
0
0
0
0
0
0
0
0
0
0
0
226
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
150
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
76
0
0
0
0
0
0
0
0
0
0
0
0
0
0
226
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 100 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.0001%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.005%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.007%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A64. 1,1,2-Trichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 5 ug/L
> 3 ug/L
> 2.5 ug/L
> 5 ug/L
> 3 ug/L
> 2.5 ug/L
> 5 ug/L
> 3 ug/L
> 2.5 ug/L
Total # Systems
Reporting
45,942
45,942
45,942
4,253
4,253
4,253
50,195
50,195
50,195
# Systems Exceeding
Threshold of Interest
5
7
8
2
5
5
7
12
13
% Systems Exceeding
Threshold of Interest
0.011%
0.015%
0.017%
0.047%
0.118%
0.118%
0.014%
0.024%
0.026%
Total Pop. Served by
Systems Reporting
86,314,890
86,314,890
86,314,890
140,536,579
140,536,579
140,536,579
226,851,469
226,851,469
226,851,469
Total Pop. Served by
Systems Exceeding
Threshold of Interest
20,910
31,838
31,882
105,441
320,808
320,808
126,351
352,646
352,690
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.024%
0.037%
0.037%
0.075%
0.228%
0.228%
0.056%
0.155%
0.155%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A64a. 1,1,2-Trichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,107
820
2,394
11,718
85,674
2,865
6,938
1,048
4,147
7,176
1,789
1,762
3,765
6,519
4,621
3,312
16,249
6,770
3,698
10,753
8,584
7,544
4,491
19,065
552
6,844
9,581
20,362
6,577
3,207
7,078
8,848
5,634
2,324
1,959
4,344
889
2,937
34,144
8,979
4,931
4,349
11,290
1,141
1,607
372,386
GW
1,970
596
1,926
9,550
45,401
2,126
6,047
1,018
4,079
6,349
1,686
1,637
3,304
5,965
4,311
1,125
12,259
5,509
3,383
9,743
7,335
6,695
3,952
17,486
417
6,265
9,103
18,574
6,101
2,574
5,410
7,686
4,199
1,682
1,591
3,805
855
1,165
27,040
7,555
4,058
3,955
11,165
445
1,121
288,218
SW
1,137
224
468
2,168
40,273
739
891
30
68
827
103
125
461
554
310
2,187
3,990
1,261
315
1,010
1,249
849
539
1,579
135
579
478
1,788
476
633
1,668
1,162
1,435
642
368
539
34
1,772
7,104
1,424
873
394
125
696
486
84,168
Percent of Samples
with Detections
Total
0.097%
0.000%
0.084%
0.026%
0.133%
0.175%
0.043%
0.000%
0.145%
0.042%
0.000%
0.000%
0.000%
0.031%
0.022%
0.211%
0.006%
0.074%
0.027%
0.000%
0.280%
0.000%
0.022%
0.016%
0.000%
0.029%
0.000%
0.108%
0.000%
0.000%
0.113%
0.011%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.011%
0.000%
0.046%
0.027%
1.227%
0.000%
0.064%
GW
0.102%
0.000%
0.052%
0.000%
0.004%
0.047%
0.050%
0.000%
0.147%
0.032%
0.000%
0.000%
0.000%
0.034%
0.023%
0.089%
0.000%
0.036%
0.030%
0.000%
0.286%
0.000%
0.025%
0.006%
0.000%
0.032%
0.000%
0.118%
0.000%
0.000%
0.111%
0.013%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.013%
0.000%
0.051%
0.027%
2.472%
0.000%
0.033%
SW
0.088%
0.000%
0.214%
0.138%
0.278%
0.541%
0.000%
0.000%
0.000%
0.121%
0.000%
0.000%
0.000%
0.000%
0.000%
0.274%
0.025%
0.238%
0.000%
0.000%
0.240%
0.000%
0.000%
0.127%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.120%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.431%
0.000%
0.169%
Minimum Detect
Concentration (u.g/L)
Total
0.12
0.15
0.5
0.5
0.1
0.74
0.08
0.56
0.52
0.5
0.04
0.68
0.5
0.5
0.2
0.5
0.54
0.55
0.21
0.5
0.5
0.5
0.3
0.01
0.18
0.01
GW
0.12
0.3
1
0.2
0.74
0.08
18
0.52
0.5
0.5
0.6
0.5
0.2
0.5
0.54
0.55
0.21
0.5
0.5
0.5
0.3
0.01
0.18
0.01
SW
1.31
0.15
0.5
0.5
0.1
0.56
0.04
0.68
0.5
0.2
0.86
0.5
0.5
0.04
Median Detect
Concentration (u.g/L)
Total
0.55
0.225
0.5
0.7
0.2
2.3
0.265
18
3.06
0.5
0.5
0.68
0.6
0.5
0.6
0.5
0.86
0.675
1.02
0.5
0.5
0.5
0.65
3.2
0.5
0.6
GW
0.335
0.3
4.9
0.2
2.3
0.265
27
3.06
0.5
0.5
1.3
0.5
0.6
0.5
0.54
0.675
1.02
0.65
0.5
0.5
0.65
3.2
0.5
0.54
SW
1.31
0.15
0.5
0.7
0.25
0.56
0.5
0.68
0.6
0.2
2
0.5
0.5
0.7
90th Percentile Detect
Concentration (u.g/L)
Total
1.31
0.3
0.5
3
0.8
4.3
0.89
36
5.6
0.5
1
0.68
2
0.5
1.1
0.5
3.14
0.8
1.8
10.1
0.5
0.5
1
15
0.5
2.4
GW
0.55
0.3
8.8
0.2
4.3
0.89
36
5.6
0.5
0.5
2
0.5
1.1
0.5
0.54
0.8
1.8
10.1
0.5
0.5
1
15
0.5
2.3
SW
1.31
0.15
0.5
2.9
0.8
0.56
1
0.68
1.8
0.2
3.14
0.5
1
2.4
Maximum Detect
Concentration (u.g/L)
Total
1.31
0.3
0.5
40
0.8
4.3
0.89
36
5.6
0.5
1
0.68
2
0.5
1.2
0.5
3.14
0.8
2.6
10.1
0.5
0.5
1
15
1
40
GW
0.55
0.3
8.8
0.2
4.3
0.89
36
5.6
0.5
0.5
2
0.5
1.2
0.5
0.54
0.8
2.6
10.1
0.5
0.5
1
15
0.5
36
SW
1.31
0.15
0.5
40
0.8
0.56
1
0.68
1.8
0.2
3.14
0.5
1
40
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A64b. 1,1,2-Trichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
263
454
1,059
3,651
826
1,207
318
1,509
1,822
106
1,056
935
1,184
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
210
771
1,258
1,398
727
338
1,524
1,944
730
1,097
145
819
245
351
4,951
500
1,600
603
1,784
403
304
50,195
GW
474
202
382
1,011
3,134
605
1,168
315
1,483
1,706
94
1,023
878
1,084
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
183
760
1,217
1,361
688
317
1,288
1,819
518
945
136
757
233
162
4,609
454
1,429
560
1,764
243
256
45,942
SW
146
61
72
48
517
221
39
3
26
116
12
33
57
100
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
171
43
20
160
48
4,253
Total Population Served by Systems
Reporting
Total
606,193
4,218,278
2,453,348
6,166,873
35,827,628
4,997,841
2,723,376
698,987
17,495,514
7,485,298
1,293,745
2,543,141
1,093,666
9,132,188
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,748,495
1,698,980
973,592
4,894,939
10,227,597
3,123,687
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,273,258
491,035
4,039,526
1,416,020
446,177
226,851,469
GW
232,590
1,123,190
910,322
2,796,282
13,515,167
530,207
389,454
417,587
15,249,472
1,592,517
1,239,117
1,434,515
837,604
2,936,410
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,712,549
1,432,432
283,701
1,044,337
3,132,660
664,833
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
630,675
227,067
2,347,782
237,670
129,229
86,314,890
SW
373,603
3,095,088
1,543,026
3,370,591
22,312,461
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,195,778
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,642,583
263,968
1,691,744
1,178,350
316,948
140,536,579
Percent of Systems
with At Least One Detection
Total
0.323%
0.000%
0.441%
0.094%
0.192%
0.605%
0.249%
0.000%
0.331%
0.110%
0.000%
0.000%
0.000%
0.169%
0.068%
2.490%
0.139%
0.380%
0.123%
0.000%
0.379%
0.000%
0.118%
0.127%
0.000%
0.259%
0.000%
0.572%
0.000%
0.000%
0.459%
0.051%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.200%
0.000%
0.332%
0.168%
3.474%
0.000%
0.179%
GW
0.211%
0.000%
0.262%
0.000%
0.064%
0.165%
0.257%
0.000%
0.337%
0.059%
0.000%
0.000%
0.000%
0.185%
0.070%
1.087%
0.000%
0.203%
0.132%
0.000%
0.193%
0.000%
0.127%
0.045%
0.000%
0.263%
0.000%
0.588%
0.000%
0.000%
0.388%
0.055%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.220%
0.000%
0.357%
0.170%
4.527%
0.000%
0.128%
SW
0.685%
0.000%
1.389%
2.083%
0.967%
1.810%
0.000%
0.000%
0.000%
0.862%
0.000%
0.000%
0.000%
0.000%
0.000%
3.356%
0.847%
2.941%
0.000%
0.000%
10.000%
0.000%
0.000%
1.439%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.847%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.875%
0.000%
0.729%
Percent of Population Served
with At Least One Detection
Total
0.254%
0.000%
0.816%
4.865%
1.426%
0.024%
0.201%
0.000%
2.554%
0.091%
0.000%
0.000%
0.000%
0.015%
0.003%
7.913%
0.274%
2.191%
0.030%
0.000%
0.974%
0.000%
0.013%
0.219%
0.000%
0.470%
0.000%
0.475%
0.000%
0.000%
0.097%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.308%
0.000%
0.967%
0.428%
2.193%
0.000%
0.908%
GW
0.598%
0.000%
0.437%
0.000%
1.474%
0.011%
1.403%
0.000%
2.930%
0.044%
0.000%
0.000%
0.000%
0.048%
0.006%
0.091%
0.000%
0.528%
0.073%
0.000%
0.968%
0.000%
0.026%
0.010%
0.000%
1.002%
0.000%
1.357%
0.000%
0.000%
0.425%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.475%
0.000%
2.090%
0.736%
1.018%
0.000%
1.016%
SW
0.040%
0.000%
1.040%
8.901%
1.396%
0.026%
0.000%
0.000%
0.000%
0.104%
0.000%
0.000%
0.000%
0.000%
0.000%
8.607%
0.344%
2.617%
0.000%
0.000%
0.990%
0.000%
0.000%
0.288%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.008%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.430%
0.000%
0.842%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A64c. 1,1,2-Trichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 5 ug/L
Total
0
0
0
0
3
0
0
0
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
7
GW
0
0
0
0
1
0
0
0
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
5
sw
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
Percent of Systems
with At Least One Detection
> 5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.082%
0.000%
0.000%
0.000%
0.000%
0.055%
0.000%
0.000%
0.000%
0.084%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.066%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.056%
0.000%
0.000%
0.014%
GW
0.000%
0.000%
0.000%
0.000%
0.032%
0.000%
0.000%
0.000%
0.000%
0.059%
0.000%
0.000%
0.000%
0.092%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.078%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.057%
0.000%
0.000%
0.011%
sw
0.000%
0.000%
0.000%
0.000%
0.387%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.047%
Population Served by Systems
with At Least One Detection
> 5 ug/L
Total
0
0
0
0
114,542
0
0
0
0
700
0
0
0
1,059
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1,685
0
0
0
0
0
0
0
0
0
0
0
8,365
0
0
126,351
GW
0
0
0
0
9,101
0
0
0
0
700
0
0
0
1,059
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1,685
0
0
0
0
0
0
0
0
0
0
0
8,365
0
0
20,910
SW
0
0
0
0
105,441
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
105,441
Percent of Population Served
with At Least One Detection
> 5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.320%
0.000%
0.000%
0.000%
0.000%
0.009%
0.000%
0.000%
0.000%
0.012%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.034%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.207%
0.000%
0.000%
0.056%
GW
0.000%
0.000%
0.000%
0.000%
0.067%
0.000%
0.000%
0.000%
0.000%
0.044%
0.000%
0.000%
0.000%
0.036%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.161%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.356%
0.000%
0.000%
0.024%
sw
0.000%
0.000%
0.000%
0.000%
0.473%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.075%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A64d. 1,1,2-Trichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>3ug/L
Total
0
0
0
0
5
0
1
0
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
2
0
0
12
GW
0
0
0
0
1
0
1
0
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
2
0
0
7
sw
0
0
0
0
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5
Percent of Systems
with At Least One Detection
>3ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.137%
0.000%
0.083%
0.000%
0.000%
0.055%
0.000%
0.000%
0.000%
0.084%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.042%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.066%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.112%
0.000%
0.000%
0.024%
GW
0.000%
0.000%
0.000%
0.000%
0.032%
0.000%
0.086%
0.000%
0.000%
0.059%
0.000%
0.000%
0.000%
0.092%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.078%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.113%
0.000%
0.000%
0.015%
sw
0.000%
0.000%
0.000%
0.000%
0.774%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.719%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.118%
Population Served by Systems
with At Least One Detection
>3ug/L
Total
0
0
0
0
320,159
0
2,800
0
0
700
0
0
0
1,059
0
0
0
0
0
0
0
0
0
9,750
0
0
0
0
0
0
1,685
0
0
0
0
0
0
0
0
0
0
0
16,493
0
0
352,646
GW
0
0
0
0
9,101
0
2,800
0
0
700
0
0
0
1,059
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1,685
0
0
0
0
0
0
0
0
0
0
0
16,493
0
0
31,838
SW
0
0
0
0
311,058
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
9,750
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
320,808
Percent of Population Served
with At Least One Detection
>3ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.894%
0.000%
0.103%
0.000%
0.000%
0.009%
0.000%
0.000%
0.000%
0.012%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.139%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.034%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.408%
0.000%
0.000%
0.155%
GW
0.000%
0.000%
0.000%
0.000%
0.067%
0.000%
0.719%
0.000%
0.000%
0.044%
0.000%
0.000%
0.000%
0.036%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.161%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.702%
0.000%
0.000%
0.037%
sw
0.000%
0.000%
0.000%
0.000%
1.394%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.185%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.228%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A64e. 1,1,2-Trichloroethane — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2.5 ug/L
Total
0
0
0
0
5
0
1
0
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
2
0
0
13
GW
0
0
0
0
1
0
1
0
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
2
0
0
8
sw
0
0
0
0
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5
Percent of Systems
with At Least One Detection
> 2.5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.137%
0.000%
0.083%
0.000%
0.000%
0.055%
0.000%
0.000%
0.000%
0.084%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.042%
0.000%
0.000%
0.000%
0.072%
0.000%
0.000%
0.066%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.112%
0.000%
0.000%
0.026%
GW
0.000%
0.000%
0.000%
0.000%
0.032%
0.000%
0.086%
0.000%
0.000%
0.059%
0.000%
0.000%
0.000%
0.092%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.073%
0.000%
0.000%
0.078%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.113%
0.000%
0.000%
0.017%
sw
0.000%
0.000%
0.000%
0.000%
0.774%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.719%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.118%
Population Served by Systems
with At Least One Detection
> 2.5 ug/L
Total
0
0
0
0
320,159
0
2,800
0
0
700
0
0
0
1,059
0
0
0
0
0
0
0
0
0
9,750
0
0
0
44
0
0
1,685
0
0
0
0
0
0
0
0
0
0
0
16,493
0
0
352,690
GW
0
0
0
0
9,101
0
2,800
0
0
700
0
0
0
1,059
0
0
0
0
0
0
0
0
0
0
0
0
0
44
0
0
1,685
0
0
0
0
0
0
0
0
0
0
0
16,493
0
0
31,882
SW
0
0
0
0
311,058
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
9,750
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
320,808
Percent of Population Served
with At Least One Detection
> 2.5 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.894%
0.000%
0.103%
0.000%
0.000%
0.009%
0.000%
0.000%
0.000%
0.012%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.139%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.034%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.408%
0.000%
0.000%
0.155%
GW
0.000%
0.000%
0.000%
0.000%
0.067%
0.000%
0.719%
0.000%
0.000%
0.044%
0.000%
0.000%
0.000%
0.036%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
0.000%
0.000%
0.161%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.702%
0.000%
0.000%
0.037%
sw
0.000%
0.000%
0.000%
0.000%
1.394%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.185%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.228%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A65. 2,4,5-Trichlorophenoxypropionic acid — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration or
Threshold of
1 nterest
> 50 ug/L
> 25 ug/L
> 50 ug/L
> 25 ug/L
> 50 ug/L
> 25 ug/L
Total # Systems
Reporting
29,954
29,954
2,933
2,933
32,887
32,887
# Systems Exceeding
Threshold of Interest
0
1
0
0
0
1
% Systems Exceeding
Threshold of Interest
0.000%
0.003%
0.000%
0.000%
0.000%
0.003%
Total Pop. Served by
Systems Reporting
66,468,861
66,468,861
116,531,907
116,531,907
183,000,768
183,000,768
Total Pop. Served by
Systems Exceeding
Threshold of Interest
0
240
0
0
0
240
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A65a. 2,4,5-Trichlorophenoxypropionic acid —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
73
541
1,588
6,802
14,002
2,527
1,599
826
2,388
1,432
1,731
2,075
4,005
2,280
1,750
2,975
2,494
378
6,587
4,627
5,802
3,183
13,959
404
2,220
4,193
162
4,349
1,568
2,891
137
2,056
740
3,304
952
56
2,174
7,085
441
1,298
3,160
645
1,254
122,713
GW
39
396
1,357
5,383
8,170
1,850
1,013
788
2,321
1,354
1,601
1,795
3,463
2,109
441
2,183
1,699
317
6,294
4,495
4,983
2,901
12,727
341
2,143
3,874
144
4,102
1,158
2,177
53
1,574
498
2,893
842
12
1,343
5,897
148
1,104
3,068
338
941
100,329
SW
34
145
231
1,419
5,832
677
586
38
67
78
130
280
542
171
1,309
792
795
61
293
132
819
282
1,232
63
77
319
18
247
410
714
84
482
242
411
110
44
831
1,188
293
194
92
307
313
22,384
Percent of Samples
with Detections
Total
0.000%
0.000%
0.000%
0.118%
0.007%
0.000%
0.438%
0.000%
0.461%
0.000%
0.000%
0.000%
0.000%
0.132%
0.457%
0.235%
0.922%
0.000%
0.000%
0.000%
0.000%
0.000%
0.043%
0.000%
0.045%
0.000%
0.000%
0.023%
0.000%
0.069%
0.730%
0.000%
0.000%
0.303%
0.000%
0.000%
0.000%
0.000%
0.000%
0.154%
0.032%
1.860%
0.000%
0.085%
GW
0.000%
0.000%
0.000%
0.130%
0.012%
0.000%
0.000%
0.000%
0.474%
0.000%
0.000%
0.000%
0.000%
0.095%
0.000%
0.183%
0.883%
0.000%
0.000%
0.000%
0.000%
0.000%
0.047%
0.000%
0.047%
0.000%
0.000%
0.024%
0.000%
0.092%
0.000%
0.000%
0.000%
0.311%
0.000%
0.000%
0.000%
0.000%
0.000%
0.181%
0.033%
2.663%
0.000%
0.071%
SW
0.000%
0.000%
0.000%
0.070%
0.000%
0.000%
1.195%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.585%
0.611%
0.379%
1.006%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.190%
0.000%
0.000%
0.243%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.977%
0.000%
0.147%
Minimum Detect
Concentration (u.g/L)
Total
0.2
0.23
0.24
0.03
0.1
0.02
0.1
0.05
0.14
0.62
2
0.9
5
0.04
0.05
0.1
0.01
0.01
GW
0.2
0.23
0.03
0.1
0.1
0.05
0.14
0.62
2
0.9
0.04
0.05
0.1
0.01
0.01
SW
0.2
0.24
0.1
0.02
0.1
0.05
5
0.06
0.01
0.01
Median Detect
Concentration (u.g/L)
Total
0.2
0.23
0.44
1
0.1
0.2
0.2
0.1
0.235
0.62
2
1.25
5
0.4
0.15
0.1
0.01
0.2
GW
0.2
0.23
1
0.15
0.45
0.08
0.235
0.62
2
1.25
0.4
0.15
0.1
0.01
0.2
SW
0.2
0.44
0.1
0.2
0.2
0.1
5
0.06
0.01
0.2
90th Percentile Detect
Concentration (u.g/L)
Total
0.26
0.23
0.44
1
0.2
0.5
2
0.3
0.6
0.62
2
1.6
5
0.4
0.25
0.1
0.1
1
GW
0.26
0.23
1
0.2
2
0.3
0.6
0.62
2
1.6
0.4
0.25
0.1
0.1
1
SW
0.2
0.44
0.1
0.5
0.2
1.05
5
0.06
0.5
0.5
Maximum Detect
Concentration (u.g/L)
Total
0.26
0.23
0.44
28
0.2
0.5
2
1.05
0.6
0.62
2
1.6
5
0.4
0.25
0.1
0.5
28
GW
0.26
0.23
28
0.2
2
0.37
0.6
0.62
2
1.6
0.4
0.25
0.1
0.1
28
SW
0.2
0.44
0.1
0.5
0.2
1.05
5
0.06
0.5
5
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A65b. 2,4,5-Trichlorophenoxypropionic acid —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
19
175
454
918
1,580
814
655
254
1,318
296
1,055
869
1,368
1,402
242
644
863
216
2,919
1,288
1,475
846
2,365
209
739
1,237
127
691
287
1,348
35
1,087
89
785
260
11
856
426
173
440
1,406
342
304
32,887
GW
14
126
382
870
1,258
595
617
251
1,296
282
1,022
812
1,264
1,358
93
527
795
190
2,858
1,259
1,398
786
2,228
182
728
1,196
116
656
266
1,117
26
937
80
725
239
5
702
389
63
407
1,386
197
256
29,954
SW
5
49
72
48
322
219
38
3
22
14
33
57
104
44
149
117
68
26
61
29
77
60
137
27
11
41
11
35
21
231
9
150
9
60
21
6
154
37
110
33
20
145
48
2,933
Total Population Served by Systems
Reporting
Total
316,371
2,796,309
2,453,348
6,045,047
33,370,087
4,993,697
2,595,127
624,615
16,796,064
993,774
2,542,641
1,064,783
9,183,247
4,866,706
4,602,489
8,506,903
4,906,061
491,237
7,224,193
3,933,642
3,281,888
757,811
6,885,177
559,198
1,454,673
945,754
1,969,193
1,656,642
960,268
4,925,666
3,028,943
2,937,439
900,695
3,448,394
622,152
648,720
18,700,247
2,500,671
2,380,983
432,449
3,883,613
1,367,674
446,177
183,000,768
GW
84,921
589,449
910,322
2,674,456
12,021,293
526,788
261,240
343,215
14,554,059
301,752
1,434,015
808,587
2,982,850
2,546,970
375,460
1,704,521
907,954
116,848
2,044,337
2,684,001
1,700,557
365,142
1,733,551
253,973
678,193
395,955
341,973
1,395,544
270,377
982,389
99,332
572,689
160,717
820,701
262,981
144,963
4,013,688
1,667,485
26,904
181,285
2,191,869
206,326
129,229
66,468,861
SW
231,450
2,206,860
1,543,026
3,370,591
21,348,794
4,466,909
2,333,887
281,400
2,242,005
692,022
1,108,626
256,196
6,200,397
2,319,736
4,227,029
6,802,382
3,998,107
374,389
5,179,856
1,249,641
1,581,331
392,669
5,151,626
305,225
776,480
549,799
1,627,220
261,098
689,891
3,943,277
2,929,611
2,364,750
739,978
2,627,693
359,171
503,757
14,686,559
833,186
2,354,079
251,164
1,691,744
1,161,348
316,948
116,531,907
Percent of Systems
with At Least One Detection
Total
0.000%
0.000%
0.000%
0.545%
0.063%
0.000%
0.611%
0.000%
0.455%
0.000%
0.000%
0.000%
0.000%
0.214%
2.479%
1.087%
2.202%
0.000%
0.000%
0.000%
0.000%
0.000%
0.254%
0.000%
0.135%
0.000%
0.000%
0.145%
0.000%
0.074%
2.857%
0.000%
0.000%
0.510%
0.000%
0.000%
0.000%
0.000%
0.000%
0.455%
0.071%
2.924%
0.000%
0.237%
GW
0.000%
0.000%
0.000%
0.460%
0.079%
0.000%
0.000%
0.000%
0.463%
0.000%
0.000%
0.000%
0.000%
0.147%
0.000%
0.759%
1.509%
0.000%
0.000%
0.000%
0.000%
0.000%
0.269%
0.000%
0.137%
0.000%
0.000%
0.152%
0.000%
0.090%
0.000%
0.000%
0.000%
0.414%
0.000%
0.000%
0.000%
0.000%
0.000%
0.491%
0.072%
4.569%
0.000%
0.177%
SW
0.000%
0.000%
0.000%
2.083%
0.000%
0.000%
10.526%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.273%
4.027%
2.564%
10.294%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
11.111%
0.000%
0.000%
1.667%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.690%
0.000%
0.852%
Percent of Population Served
with At Least One Detection
Total
0.000%
0.000%
0.000%
5.847%
0.000%
0.000%
17.134%
0.000%
15.506%
0.000%
0.000%
0.000%
0.000%
5.417%
8.257%
1.472%
4.634%
0.000%
0.000%
0.000%
0.000%
0.000%
0.551%
0.000%
0.556%
0.000%
0.000%
0.490%
0.000%
0.034%
7.115%
0.000%
0.000%
1.873%
0.000%
0.000%
0.000%
0.000%
0.000%
0.117%
0.360%
0.465%
0.000%
2.599%
GW
0.000%
0.000%
0.000%
1.998%
0.000%
0.000%
0.000%
0.000%
17.894%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
3.401%
0.739%
0.000%
0.000%
0.000%
0.000%
0.000%
2.190%
0.000%
1.192%
0.000%
0.000%
0.581%
0.000%
0.172%
0.000%
0.000%
0.000%
2.931%
0.000%
0.000%
0.000%
0.000%
0.000%
0.280%
0.639%
0.961%
0.000%
4.241%
SW
0.000%
0.000%
0.000%
8.901%
0.000%
0.000%
19.052%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
11.360%
8.990%
0.989%
5.519%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
7.357%
0.000%
0.000%
1.543%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.377%
0.000%
1.662%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A65c. 2,4,5-Trichlorophenoxypropionic acid — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 50 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 50 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 50 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 50 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A65d. 2,4,5-Trichlorophenoxypropionic acid —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 25 ug/L
Total
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
GW
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 25 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.076%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.077%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 25 ug/L
Total
0
0
0
0
0
0
0
0
240
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
240
GW
0
0
0
0
0
0
0
0
240
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
240
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 25 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.0001%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.0004%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A66. Trichloroethylene (TCE) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
> 5 ug/L
> 2.5 ug/L
>lug/L
> 0.5 ug/L
Total # Systems
Reporting
46,177
46,177
46,177
46,177
4,255
4,255
4,255
4,255
50,432
50,432
50,432
50,432
# Systems Exceeding
Threshold of Interest
157
283
490
682
38
55
93
122
195
338
583
804
% Systems Exceeding
Threshold of Interest
0.340%
0.613%
1.061%
1.477%
0.893%
1.293%
2.186%
2.867%
0.387%
0.670%
1.156%
1.594%
Total Pop. Served by
Systems Reporting
86,393,209
86,393,209
86,393,209
86,393,209
140,514,477
140,514,477
140,514,477
140,514,477
226,907,686
226,907,686
226,907,686
226,907,686
Total Pop. Served by
Systems Exceeding
Threshold of Interest
2,241,272
4,817,431
7,008,143
8,714,465
9,703,812
11,131,487
16,021,388
17,384,229
11,945,084
15,948,918
23,029,531
26,098,694
% Pop. Served by
Systems Exceeding
Threshold of Interest
2.594%
5.576%
8.112%
10.087%
6.906%
7.922%
11.402%
12.372%
5.264%
7.029%
10.149%
11.502%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A66a. Trichloroethylene (TCE) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,114
1,002
2,382
12,598
114,988
2,866
6,934
1,066
4,173
7,174
1,792
1,846
3,769
7,057
4,630
3,313
16,225
6,774
3,692
10,752
8,596
7,544
4,480
19,067
558
6,838
9,589
20,355
6,576
3,255
7,127
8,846
5,634
2,327
1,959
4,340
889
2,945
34,145
8,995
4,895
4,345
11,296
1,190
1,671
403,609
GW
1,976
672
1,915
9,545
61,095
2,126
6,042
1,037
4,105
6,347
1,689
1,719
3,308
6,492
4,320
1,129
12,259
5,512
3,377
9,742
7,346
6,695
3,946
17,488
417
6,262
9,111
18,567
6,100
2,586
5,455
7,688
4,199
1,682
1,591
3,801
855
1,165
27,040
7,564
4,026
3,954
11,171
492
1,168
304,776
SW
1,138
330
467
3,053
53,893
740
892
29
68
827
103
127
461
565
310
2,184
3,966
1,262
315
1,010
1,250
849
534
1,579
141
576
478
1,788
476
669
1,672
1,158
1,435
645
368
539
34
1,780
7,105
1,431
869
391
125
698
503
98,833
Percent of Samples
with Detections
Total
0.578%
22.056%
1.931%
1.603%
20.308%
0.314%
5.076%
2.251%
2.876%
0.502%
0.000%
2.817%
6.129%
2.848%
1.663%
1.720%
4.222%
1.845%
0.948%
1.888%
3.327%
2.717%
0.201%
1.301%
1.971%
2.135%
1.126%
3.468%
1.521%
3.164%
3.367%
1.933%
1.367%
0.430%
1.991%
1.290%
0.900%
0.441%
0.255%
0.278%
1.144%
0.230%
6.232%
6.639%
0.838%
7.323%
GW
0.759%
14.137%
2.402%
1.697%
15.613%
0.376%
4.138%
2.314%
2.899%
0.425%
0.000%
2.909%
6.862%
3.096%
1.782%
4.074%
3.442%
1.941%
0.888%
2.084%
3.784%
3.032%
0.228%
1.395%
0.719%
2.332%
1.163%
3.307%
1.541%
0.193%
2.511%
2.198%
1.834%
0.535%
2.263%
1.342%
0.936%
1.116%
0.288%
0.331%
1.341%
0.253%
6.266%
13.415%
1.199%
4.855%
SW
0.264%
38.182%
0.000%
1.310%
25.630%
0.135%
11.435%
0.000%
1.471%
1.088%
0.000%
1.575%
0.868%
0.000%
0.000%
0.504%
6.631%
1.426%
1.587%
0.000%
0.640%
0.236%
0.000%
0.253%
5.674%
0.000%
0.418%
5.145%
1.261%
14.649%
6.160%
0.173%
0.000%
0.155%
0.815%
0.928%
0.000%
0.000%
0.127%
0.000%
0.230%
0.000%
3.200%
1.862%
0.000%
14.934%
Minimum Detect
Concentration (u.g/L)
Total
0.44
0.17
0.16
0.18
0.007
0.09
0.1
0.51
0.02
0.5
0.5
0.1
0.4
0.22
0.001
0.2
0.5
0.5
0.4
0.1
0.5
0.55
0.5
0.89
0.15
0.5
0.09
0.1
0.2
0.3
0.31
0.3
0.5
0.3
0.4
0.53
0.5
0.5
0.7
0.5
0.2
0.01
0.0018
0.5
0.001
GW
0.5
0.17
0.16
0.18
0.007
0.09
0.26
0.51
0.02
0.5
0.5
0.1
0.4
0.22
0.1
0.2
0.5
0.5
0.4
0.1
0.5
0.55
0.5
0.89
0.15
0.5
0.09
0.1
0.5
0.3
0.5
0.3
0.5
0.3
0.4
0.53
0.5
0.5
0.7
0.5
0.2
0.01
0.0018
0.5
0.0018
SW
0.44
0.51
0.5
0.5
0.87
0.1
0.95
0.55
1.1
0.5
0.001
0.34
0.5
1
0.1
0.6
1.04
1.52
1
0.1
0.2
0.2
0.5
0.31
1.2
0.5
0.4
0.5
0.6
0.11
0.5
0.001
Median Detect
Concentration (u.g/L)
Total
0.705
1.6
1.53
1.5
1.7
0.6
1.6
0.785
0.25
2.4
1
1.5
1.2
1.2
1
1.2
1.2
0.7
0.7
0.55
1.1
1.03
1.4
1.81
1.1
1
0.54
1
1.3
1.55
1.03
1.2
0.7
0.8
1.54
0.68
0.85
1.02
1
1.2
0.55
0.725
2.1
2.6
1.5
GW
0.78
1
1.53
2.5
1.6
0.6
2
0.785
0.24
2.2
1
1.5
1.2
1.2
1.4
1
1.3
0.61
0.7
0.6
1.1
1.03
1.4
0.96
1.1
0.985
0.55
1.055
0.75
1.4
1.07
1.2
0.7
0.9
1.56
0.68
0.85
1.065
1
1.25
0.55
0.735
2
2.6
1.3
SW
0.51
2.59
0.73
1.85
0.87
1.2
0.95
14
1.55
0.5
0.5
1.4
0.75
1.3
0.15
1.17
2.05
2.18
1.45
0.51
0.4
1.315
1.7
0.32
1.2
0.6
0.4
0.8
0.6
0.18
4.4
1.8
90th Percentile Detect
Concentration (u.g/L)
Total
0.9
3.6
4.78
4.2
12
1.2
8.7
74.1
1.12
15
3.2
7.3
2.96
5.5
4
11
4.3
1.9
3.2
2.3
4.7
2.31
4.91
2.69
4.4
3.14
1.7
4.55
2.2
9.35
2.75
43.9
2.2
3
4.09
0.93
1.1
7.3
3.7
3.1
1.05
13
7
5.6
10.5
GW
0.9
2.9
4.78
4.3
8.8
1.2
11.5
74.1
1.13
6.9
3.65
7.6
2.96
5.5
4.1
7.1
5.4
1.75
3.2
2.3
4.7
2.31
4.91
1.52
4.4
3.14
1.72
4.6
2
10.5
2.9
43.9
3.2
3
4.09
0.93
1.1
7.4
3.7
3.1
1.05
13
6.6
5.6
7.5
SW
0.71
4
1.15
14.8
0.87
2.9
0.95
18
2
0.9
1
38
4.1
50
0.4
1.74
2.9
3.62
1.9
0.9
0.5
2.4
8.4
0.33
1.2
0.6
0.4
1.1
0.6
0.23
12.2
14.2
Maximum Detect
Concentration (u.g/L)
Total
1.3
13.1
6.1
6.3
159
1.2
90.9
93.6
8.9
18
10.4
15.7
7.34
13
8
50
22.4
50
6.5
7.5
44
2.31
16.8
3.62
7.9
23.53
71.64
18
3.84
23
15.8
58.7
3.2
4.6
21.2
0.93
1.2
21
4.2
4.6
1.1
38
27
5.8
159
GW
1.3
10.9
6.1
6.3
159
1.2
90.9
93.6
8.9
8.4
10.4
15.7
7.34
13
8
31.7
19.2
3
6.5
7.5
44
2.31
16.8
1.52
7.9
23.53
71.64
18
2
23
15.8
58.7
3.2
4.6
21.2
0.93
1.2
21
4.2
4.6
1.1
38
27
5.8
159
SW
0.71
13.1
1.3
50
0.87
20.2
0.95
18
2
0.9
1.7
50
22.4
50
0.4
1.74
2.9
3.62
1.9
6.4
0.5
3.84
15.2
0.33
1.2
0.6
0.4
1.1
0.6
0.23
12.6
50
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A66b. Trichloroethylene (TCE) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
264
454
1,059
3,656
826
1,207
319
1,509
1,822
106
1,056
935
1,430
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
210
771
1,258
1,398
727
338
1,520
1,944
730
1,097
145
819
245
351
4,951
500
1,588
603
1,784
403
304
50,432
GW
474
203
382
1,011
3,140
605
1,168
316
1,483
1,706
94
1,023
878
1,326
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
183
760
1,217
1,361
688
317
1,284
1,819
518
945
136
757
233
162
4,609
454
1,418
560
1,764
243
256
46,177
SW
146
61
72
48
516
221
39
3
26
116
12
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
170
43
20
160
48
4,255
Total Population Served by Systems
Reporting
Total
606,193
4,218,673
2,453,348
6,166,873
35,803,350
4,997,841
2,723,376
699,172
17,495,514
7,485,298
1,293,745
2,543,141
1,093,666
9,217,581
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,748,495
1,698,980
973,592
4,893,045
10,227,597
3,123,687
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,269,674
491,035
4,039,526
1,416,020
446,177
226,907,686
GW
232,590
1,123,585
910,322
2,796,282
13,516,462
530,207
389,454
417,772
15,249,472
1,592,517
1,239,117
1,434,515
837,604
3,017,184
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,712,549
1,432,432
283,701
1,042,443
3,132,660
664,833
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
628,239
227,067
2,347,782
237,670
129,229
86,393,209
SW
373,603
3,095,088
1,543,026
3,370,591
22,286,888
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,641,435
263,968
1,691,744
1,178,350
316,948
140,514,477
Percent of Systems
with At Least One Detection
Total
0.968%
7.576%
1.982%
1.416%
4.349%
0.847%
3.728%
1.254%
0.994%
0.329%
0.000%
1.231%
1.390%
1.049%
1.357%
6.639%
7.521%
2.372%
0.988%
0.841%
3.919%
0.988%
0.472%
1.986%
0.952%
2.205%
2.067%
7.225%
2.338%
0.888%
2.237%
1.080%
1.781%
0.365%
5.517%
2.198%
0.816%
0.855%
0.485%
0.600%
0.819%
1.161%
3.756%
5.955%
1.316%
2.009%
GW
0.844%
5.911%
2.356%
1.187%
3.599%
0.992%
3.339%
1.266%
0.944%
0.234%
0.000%
1.173%
1.367%
1.131%
1.399%
5.435%
6.000%
2.130%
0.925%
0.859%
3.737%
0.896%
0.508%
1.930%
0.546%
2.237%
1.972%
6.980%
2.180%
0.631%
2.103%
1.100%
2.510%
0.317%
5.147%
1.717%
0.858%
1.852%
0.499%
0.661%
0.776%
1.250%
3.685%
8.230%
1.563%
1.867%
SW
1.370%
13.115%
0.000%
6.250%
8.915%
0.452%
15.385%
0.000%
3.846%
1.724%
0.000%
3.030%
1.754%
0.000%
0.000%
7.383%
15.254%
5.882%
1.887%
0.000%
13.333%
2.597%
0.000%
2.878%
3.704%
0.000%
4.878%
16.216%
5.128%
4.762%
2.966%
0.800%
0.000%
0.658%
11.111%
8.065%
0.000%
0.000%
0.292%
0.000%
1.176%
0.000%
10.000%
2.500%
0.000%
3.549%
Percent of Population Served
with At Least One Detection
Total
0.507%
19.683%
1.335%
23.105%
40.706%
0.020%
25.688%
0.760%
5.443%
0.684%
0.000%
9.767%
27.323%
3.256%
4.481%
9.416%
8.427%
3.039%
6.049%
3.820%
23.430%
0.662%
0.098%
11.706%
1.919%
6.175%
21.901%
27.093%
38.532%
34.564%
11.222%
2.653%
2.588%
1.048%
12.037%
3.508%
7.748%
0.150%
3.987%
0.815%
2.612%
1.765%
14.656%
5.995%
0.072%
13.018%
GW
0.921%
17.588%
3.599%
28.061%
26.679%
0.125%
11.664%
1.272%
6.182%
0.138%
0.000%
11.388%
13.469%
9.947%
8.523%
6.441%
18.811%
3.901%
7.362%
13.823%
16.179%
0.963%
0.203%
5.189%
1.543%
13.168%
5.569%
26.430%
45.132%
0.754%
18.742%
1.783%
12.157%
5.325%
3.498%
4.149%
10.628%
0.582%
3.366%
1.224%
0.333%
3.816%
23.694%
18.091%
0.248%
12.214%
SW
0.250%
20.444%
0.000%
18.994%
49.213%
0.008%
28.028%
0.000%
0.423%
0.831%
0.000%
7.670%
72.639%
0.000%
0.000%
9.680%
5.757%
2.818%
5.166%
0.000%
40.902%
0.277%
0.000%
13.851%
2.236%
0.000%
33.753%
27.450%
3.064%
48.467%
9.186%
3.038%
0.000%
0.008%
14.043%
3.329%
0.000%
0.000%
4.352%
0.000%
2.920%
0.000%
2.113%
3.556%
0.000%
13.512%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A66c. Trichloroethylene (TCE) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 5 ug/L
Total
0
5
2
2
65
0
13
2
1
3
0
1
3
4
5
1
11
4
1
1
3
3
0
6
0
4
4
16
3
0
7
2
1
0
0
3
0
0
5
0
0
0
8
5
1
195
GW
0
3
2
2
43
0
10
2
1
2
0
1
3
4
5
1
7
3
0
1
3
3
0
6
0
4
4
14
3
0
6
2
1
0
0
3
0
0
5
0
0
0
8
4
1
157
SW
0
2
0
0
22
0
3
0
0
1
0
0
0
0
0
0
4
1
1
0
0
0
0
0
0
0
0
2
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
0
38
Percent of Systems
with At Least One Detection
> 5 ug/L
Total
0.000%
1.894%
0.441%
0.189%
1.778%
0.000%
1.077%
0.627%
0.066%
0.165%
0.000%
0.095%
0.321%
0.280%
0.339%
0.415%
1.532%
0.380%
0.123%
0.034%
0.190%
0.212%
0.000%
0.253%
0.000%
0.519%
0.318%
1.144%
0.413%
0.000%
0.461%
0.103%
0.137%
0.000%
0.000%
0.366%
0.000%
0.000%
0.101%
0.000%
0.000%
0.000%
0.448%
1.241%
0.329%
0.387%
GW
0.000%
1.478%
0.524%
0.198%
1.369%
0.000%
0.856%
0.633%
0.067%
0.117%
0.000%
0.098%
0.342%
0.302%
0.350%
1.087%
1.167%
0.304%
0.000%
0.034%
0.193%
0.224%
0.000%
0.269%
0.000%
0.526%
0.329%
1.029%
0.436%
0.000%
0.467%
0.110%
0.193%
0.000%
0.000%
0.396%
0.000%
0.000%
0.108%
0.000%
0.000%
0.000%
0.454%
1.646%
0.391%
0.340%
SW
0.000%
3.279%
0.000%
0.000%
4.264%
0.000%
7.692%
0.000%
0.000%
0.862%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.390%
1.471%
1.887%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
5.405%
0.000%
0.000%
0.424%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.625%
0.000%
0.893%
Population Served by Systems
with At Least One Detection
> 5 ug/L
Total
0
291,136
19,740
47,273
9,313,108
0
483,768
4,510
32,680
48,011
0
73,051
59,816
21,912
4,680
1,930
182,089
19,918
22,500
5,840
3,261
8,588
0
12,676
0
3,849
527
848,739
10,025
0
288,775
348
2,086
0
0
5,874
0
0
6,911
0
0
0
70,219
51,144
100
11,945,084
GW
0
48,827
19,740
47,273
1,542,488
0
5,757
4,510
32,680
1,150
0
73,051
59,816
21,912
4,680
1,930
91,001
13,818
0
5,840
3,261
8,588
0
12,676
0
3,849
527
95,828
10,025
0
17,825
348
2,086
0
0
5,874
0
0
6,911
0
0
0
70,219
28,682
100
2,241,272
SW
0
242,309
0
0
7,770,620
0
478,011
0
0
46,861
0
0
0
0
0
0
91,088
6,100
22,500
0
0
0
0
0
0
0
0
752,911
0
0
270,950
0
0
0
0
0
0
0
0
0
0
0
0
22,462
0
9,703,812
Percent of Population Served
with At Least One Detection
> 5 ug/L
Total
0.000%
6.901%
0.805%
0.767%
26.012%
0.000%
17.764%
0.645%
0.187%
0.641%
0.000%
2.872%
5.469%
0.238%
0.096%
0.042%
2.128%
0.397%
3.089%
0.082%
0.077%
0.286%
0.000%
0.181%
0.000%
0.263%
0.056%
10.954%
0.590%
0.000%
5.902%
0.003%
0.067%
0.000%
0.000%
0.175%
0.000%
0.000%
0.028%
0.000%
0.000%
0.000%
1.738%
3.612%
0.022%
5.264%
GW
0.000%
4.346%
2.168%
1.691%
11.412%
0.000%
1.478%
1.080%
0.214%
0.072%
0.000%
5.092%
7.141%
0.726%
0.182%
0.514%
5.200%
1.348%
0.000%
0.295%
0.108%
0.508%
0.000%
0.731%
0.000%
0.561%
0.132%
3.533%
0.700%
0.000%
1.710%
0.011%
0.314%
0.000%
0.000%
0.801%
0.000%
0.000%
0.074%
0.000%
0.000%
0.000%
2.991%
12.068%
0.077%
2.594%
SW
0.000%
7.829%
0.000%
0.000%
34.866%
0.000%
20.481%
0.000%
0.000%
0.795%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.338%
0.153%
5.166%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
14.951%
0.000%
0.000%
7.037%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.906%
0.000%
6.906%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A66d. Trichloroethylene (TCE) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2.5 ug/L
Total
0
12
2
5
86
0
19
2
1
4
0
2
5
10
7
3
21
11
2
8
7
5
0
10
1
8
9
29
4
1
11
6
2
1
1
6
0
0
8
2
3
0
15
7
2
338
GW
0
7
2
5
59
0
16
2
1
3
0
2
5
10
7
3
13
9
1
8
7
5
0
9
0
8
9
27
4
0
10
6
2
1
1
6
0
0
8
2
3
0
15
5
2
283
SW
0
5
0
0
27
0
3
0
0
1
0
0
0
0
0
0
8
2
1
0
0
0
0
1
1
0
0
2
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
2
0
55
Percent of Systems
with At Least One Detection
> 2.5 ug/L
Total
0.000%
4.545%
0.441%
0.472%
2.352%
0.000%
1.574%
0.627%
0.066%
0.220%
0.000%
0.189%
0.535%
0.699%
0.475%
1.245%
2.925%
1.044%
0.247%
0.269%
0.442%
0.353%
0.000%
0.422%
0.476%
1.038%
0.715%
2.074%
0.550%
0.296%
0.724%
0.309%
0.274%
0.091%
0.690%
0.733%
0.000%
0.000%
0.162%
0.400%
0.189%
0.000%
0.841%
1.737%
0.658%
0.670%
GW
0.000%
3.448%
0.524%
0.495%
1.879%
0.000%
1.370%
0.633%
0.067%
0.176%
0.000%
0.196%
0.569%
0.754%
0.490%
3.261%
2.167%
0.913%
0.132%
0.275%
0.451%
0.373%
0.000%
0.404%
0.000%
1.053%
0.740%
1.984%
0.581%
0.000%
0.779%
0.330%
0.386%
0.106%
0.735%
0.793%
0.000%
0.000%
0.174%
0.441%
0.212%
0.000%
0.850%
2.058%
0.781%
0.613%
SW
0.000%
8.197%
0.000%
0.000%
5.233%
0.000%
7.692%
0.000%
0.000%
0.862%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
6.780%
2.941%
1.887%
0.000%
0.000%
0.000%
0.000%
0.719%
3.704%
0.000%
0.000%
5.405%
0.000%
4.762%
0.424%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.250%
0.000%
1.293%
Population Served by Systems
with At Least One Detection
> 2.5 ug/L
Total
0
721,003
19,740
767,312
10,835,974
0
484,017
4,510
32,680
48,079
0
78,597
102,496
247,753
10,230
5,239
409,702
38,090
22,630
38,329
71,935
9,008
0
19,308
6,826
49,646
17,391
942,587
59,050
334,370
294,565
7,725
2,444
65
1,200
6,415
0
0
10,121
19,500
786
0
161,431
68,039
125
15,948,918
GW
0
148,629
19,740
767,312
2,465,720
0
6,006
4,510
32,680
1,218
0
78,597
102,496
247,753
10,230
5,239
179,187
31,920
130
38,329
71,935
9,008
0
15,286
0
49,646
17,391
189,676
59,050
0
23,615
7,725
2,444
65
1,200
6,415
0
0
10,121
19,500
786
0
161,431
32,316
125
4,817,431
SW
0
572,374
0
0
8,370,254
0
478,011
0
0
46,861
0
0
0
0
0
0
230,515
6,170
22,500
0
0
0
0
4,022
6,826
0
0
752,911
0
334,370
270,950
0
0
0
0
0
0
0
0
0
0
0
0
35,723
0
11,131,487
Percent of Population Served
with At Least One Detection
> 2.5 ug/L
Total
0.000%
17.091%
0.805%
12.442%
30.265%
0.000%
17.773%
0.645%
0.187%
0.642%
0.000%
3.091%
9.372%
2.688%
0.209%
0.114%
4.788%
0.758%
3.107%
0.535%
1.688%
0.300%
0.000%
0.276%
1.214%
3.395%
1.833%
12.165%
3.476%
34.344%
6.020%
0.076%
0.078%
0.002%
0.131%
0.191%
0.000%
0.000%
0.040%
0.764%
0.015%
0.000%
3.996%
4.805%
0.028%
7.029%
GW
0.000%
13.228%
2.168%
27.440%
18.242%
0.000%
1.542%
1.080%
0.214%
0.076%
0.000%
5.479%
12.237%
8.211%
0.398%
1.396%
10.240%
3.113%
0.044%
1.938%
2.389%
0.533%
0.000%
0.882%
0.000%
7.240%
4.359%
6.993%
4.122%
0.000%
2.265%
0.247%
0.368%
0.011%
0.690%
0.875%
0.000%
0.000%
0.109%
1.148%
0.125%
0.000%
6.876%
13.597%
0.097%
5.576%
SW
0.000%
18.493%
0.000%
0.000%
37.557%
0.000%
20.481%
0.000%
0.000%
0.795%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.386%
0.154%
5.166%
0.000%
0.000%
0.000%
0.000%
0.076%
2.236%
0.000%
0.000%
14.951%
0.000%
48.467%
7.037%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.032%
0.000%
7.922%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A66e. Trichloroethylene (TCE) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>lug/L
Total
1
17
2
10
132
1
37
3
3
4
0
7
10
12
13
5
33
19
3
12
16
10
2
26
2
10
18
49
7
2
16
14
7
2
4
9
0
1
16
3
9
3
20
10
3
583
GW
1
10
2
9
93
1
31
3
3
3
0
6
10
12
13
3
20
16
2
12
16
9
2
22
1
10
16
46
7
1
14
14
7
1
4
9
0
1
15
3
9
3
20
7
3
490
SW
0
7
0
1
39
0
6
0
0
1
0
1
0
0
0
2
13
3
1
0
0
1
0
4
1
0
2
3
0
1
2
0
0
1
0
0
0
0
1
0
0
0
0
3
0
93
Percent of Systems
with At Least One Detection
> 1 ug/L
Total
0.161%
6.439%
0.441%
0.944%
3.611%
0.121%
3.065%
0.940%
0.199%
0.220%
0.000%
0.663%
1.070%
0.839%
0.882%
2.075%
4.596%
1.803%
0.370%
0.404%
1.011%
0.706%
0.236%
1.098%
0.952%
1.297%
1.431%
3.505%
0.963%
0.592%
1.053%
0.720%
0.959%
0.182%
2.759%
1.099%
0.000%
0.285%
0.323%
0.600%
0.567%
0.498%
1.121%
2.481%
0.987%
1.156%
GW
0.211%
4.926%
0.524%
0.890%
2.962%
0.165%
2.654%
0.949%
0.202%
0.176%
0.000%
0.587%
1.139%
0.905%
0.909%
3.261%
3.333%
1.623%
0.264%
0.412%
1.031%
0.672%
0.254%
0.987%
0.546%
1.316%
1.315%
3.380%
1.017%
0.315%
1.090%
0.770%
1.351%
0.106%
2.941%
1.189%
0.000%
0.617%
0.325%
0.661%
0.635%
0.536%
1.134%
2.881%
1.172%
1.061%
SW
0.000%
11.475%
0.000%
2.083%
7.558%
0.000%
15.385%
0.000%
0.000%
0.862%
0.000%
3.030%
0.000%
0.000%
0.000%
1.342%
11.017%
4.412%
1.887%
0.000%
0.000%
1.299%
0.000%
2.878%
3.704%
0.000%
4.878%
8.108%
0.000%
4.762%
0.847%
0.000%
0.000%
0.658%
0.000%
0.000%
0.000%
0.000%
0.292%
0.000%
0.000%
0.000%
0.000%
1.875%
0.000%
2.186%
Population Served by Systems
with At Least One Detection
>lug/L
Total
500
759,097
19,740
944,098
14,006,721
65
680,737
4,560
348,225
48,079
0
243,985
105,471
258,591
104,920
65,951
513,503
46,172
22,755
45,373
194,561
13,629
235
773,293
10,793
53,516
207,032
1,508,724
67,954
334,410
350,940
41,573
34,522
265
5,870
29,714
0
1,541
708,693
20,800
1,738
2,290
377,456
71,159
280
23,029,531
GW
500
165,389
19,740
784,098
3,239,696
65
26,577
4,560
348,225
1,218
0
158,957
105,471
258,591
104,920
5,239
209,423
38,081
255
45,373
194,561
12,455
235
44,038
3,967
53,516
21,459
443,937
67,954
40
79,670
41,573
34,522
65
5,870
29,714
0
1,541
20,448
20,800
1,738
2,290
377,456
33,636
280
7,008,143
SW
0
593,708
0
160,000
10,767,025
0
654,160
0
0
46,861
0
85,028
0
0
0
60,712
304,080
8,091
22,500
0
0
1,174
0
729,255
6,826
0
185,573
1,064,787
0
334,370
271,270
0
0
200
0
0
0
0
688,245
0
0
0
0
37,523
0
16,021,388
Percent of Population Served
with At Least One Detection
>lug/L
Total
0.082%
17.994%
0.805%
15.309%
39.121%
0.001%
24.996%
0.652%
1.990%
0.642%
0.000%
9.594%
9.644%
2.805%
2.145%
1.433%
6.001%
0.919%
3.124%
0.634%
4.567%
0.454%
0.031%
11.050%
1.919%
3.660%
21.821%
19.471%
4.000%
34.348%
7.172%
0.406%
1.105%
0.009%
0.642%
0.885%
0.000%
0.027%
2.822%
0.815%
0.033%
0.466%
9.344%
5.025%
0.063%
10.149%
GW
0.215%
14.720%
2.168%
28.041%
23.969%
0.012%
6.824%
1.092%
2.284%
0.076%
0.000%
11.081%
12.592%
8.571%
4.080%
1.396%
11.968%
3.714%
0.087%
2.294%
6.462%
0.737%
0.064%
2.541%
1.543%
7.805%
5.378%
16.366%
4.744%
0.014%
7.643%
1.327%
5.193%
0.011%
3.375%
4.054%
0.000%
0.105%
0.220%
1.224%
0.277%
1.009%
16.077%
14.152%
0.217%
8.112%
SW
0.000%
19.182%
0.000%
4.747%
48.311%
0.000%
28.028%
0.000%
0.000%
0.795%
0.000%
7.670%
0.000%
0.000%
0.000%
1.436%
4.467%
0.202%
5.166%
0.000%
0.000%
0.089%
0.000%
13.851%
2.236%
0.000%
33.753%
21.144%
0.000%
48.467%
7.045%
0.000%
0.000%
0.008%
0.000%
0.000%
0.000%
0.000%
4.352%
0.000%
0.000%
0.000%
0.000%
3.184%
0.000%
11.402%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A66f. Trichloroethylene (TCE) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.5 ug/L
Total
6
20
3
14
151
5
45
4
6
5
0
12
12
14
20
9
47
25
8
19
25
14
4
42
2
14
24
79
8
3
26
20
9
3
7
11
2
2
22
3
13
4
28
10
4
804
GW
4
12
3
12
107
4
39
4
5
3
0
11
11
14
20
5
31
21
7
19
25
12
4
38
1
14
22
73
8
2
21
20
9
2
6
11
2
2
21
3
11
4
28
7
4
682
SW
2
8
0
2
44
1
6
0
1
2
0
1
1
0
0
4
16
4
1
0
0
2
0
4
1
0
2
6
0
1
5
0
0
1
1
0
0
0
1
0
2
0
0
3
0
122
Percent of Systems
with At Least One Detection
> 0.5 ug/L
Total
0.968%
7.576%
0.661%
1.322%
4.130%
0.605%
3.728%
1.254%
0.398%
0.274%
0.000%
1.136%
1.283%
0.979%
1.357%
3.734%
6.546%
2.372%
0.988%
0.639%
1.580%
0.988%
0.472%
1.774%
0.952%
1.816%
1.908%
5.651%
1.100%
0.888%
1.711%
1.029%
1.233%
0.273%
4.828%
1.343%
0.816%
0.570%
0.444%
0.600%
0.819%
0.663%
1.570%
2.481%
1.316%
1.594%
GW
0.844%
5.911%
0.785%
1.187%
3.408%
0.661%
3.339%
1.266%
0.337%
0.176%
0.000%
1.075%
1.253%
1.056%
1.399%
5.435%
5.167%
2.130%
0.925%
0.653%
1.611%
0.896%
0.508%
1.706%
0.546%
1.842%
1.808%
5.364%
1.163%
0.631%
1.636%
1.100%
1.737%
0.212%
4.412%
1.453%
0.858%
1.235%
0.456%
0.661%
0.776%
0.714%
1.587%
2.881%
1.563%
1.477%
SW
1.370%
13.115%
0.000%
4.167%
8.527%
0.452%
15.385%
0.000%
3.846%
1.724%
0.000%
3.030%
1.754%
0.000%
0.000%
2.685%
13.559%
5.882%
1.887%
0.000%
0.000%
2.597%
0.000%
2.878%
3.704%
0.000%
4.878%
16.216%
0.000%
4.762%
2.119%
0.000%
0.000%
0.658%
11.111%
0.000%
0.000%
0.000%
0.292%
0.000%
1.176%
0.000%
0.000%
1.875%
0.000%
2.867%
Population Served by Systems
with At Least One Detection
> 0.5 ug/L
Total
3,075
830,371
23,718
1,124,883
14,484,081
646
699,584
5,316
434,952
50,199
0
247,113
294,221
298,970
219,162
95,046
650,392
152,654
44,055
223,474
226,879
19,902
740
779,057
10,793
79,820
207,599
1,987,792
149,117
336,510
484,035
55,869
37,044
30,765
109,891
30,353
20,641
6,835
1,000,446
20,800
137,640
3,790
408,984
71,159
321
26,098,694
GW
2,141
197,612
23,718
784,658
3,569,344
290
45,424
5,316
425,452
1,218
0
162,085
108,221
298,970
219,162
24,176
305,761
39,996
21,555
223,474
226,879
16,265
740
49,802
3,967
79,820
22,026
605,404
149,117
2,140
130,627
55,869
37,044
30,565
5,975
30,353
20,641
6,835
312,201
20,800
2,091
3,790
408,984
33,636
321
8,714,465
SW
934
632,759
0
340,225
10,914,737
356
654,160
0
9,500
48,981
0
85,028
186,000
0
0
70,870
344,631
112,658
22,500
0
0
3,637
0
729,255
6,826
0
185,573
1,382,388
0
334,370
353,408
0
0
200
103,916
0
0
0
688,245
0
135,549
0
0
37,523
0
17,384,229
Percent of Population Served
with At Least One Detection
> 0.5 ug/L
Total
0.507%
19.683%
0.967%
18.241%
40.455%
0.013%
25.688%
0.760%
2.486%
0.671%
0.000%
9.717%
26.902%
3.243%
4.481%
2.065%
7.600%
3.039%
6.049%
3.122%
5.325%
0.662%
0.098%
11.132%
1.919%
5.459%
21.880%
25.654%
8.777%
34.564%
9.892%
0.546%
1.186%
1.046%
12.025%
0.904%
7.748%
0.120%
3.984%
0.815%
2.612%
0.772%
10.125%
5.025%
0.072%
11.502%
GW
0.921%
17.588%
2.605%
28.061%
26.407%
0.055%
11.664%
1.272%
2.790%
0.076%
0.000%
11.299%
12.920%
9.909%
8.523%
6.441%
17.473%
3.901%
7.362%
11.299%
7.535%
0.963%
0.203%
2.874%
1.543%
11.641%
5.520%
22.319%
10.410%
0.754%
12.531%
1.783%
5.572%
5.319%
3.436%
4.142%
10.628%
0.467%
3.358%
1.224%
0.333%
1.669%
17.420%
14.152%
0.248%
10.087%
SW
0.250%
20.444%
0.000%
10.094%
48.974%
0.008%
28.028%
0.000%
0.423%
0.831%
0.000%
7.670%
72.639%
0.000%
0.000%
1.677%
5.063%
2.818%
5.166%
0.000%
0.000%
0.277%
0.000%
13.851%
2.236%
0.000%
33.753%
27.450%
0.000%
48.467%
9.178%
0.000%
0.000%
0.008%
14.043%
0.000%
0.000%
0.000%
4.352%
0.000%
2.920%
0.000%
0.000%
3.184%
0.000%
12.372%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A67. Uranium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water Type
Ground Water
Surface Water
Combined Ground &
Surface Water
Concentration
or Threshold
of Interest
> 30 ug/L
> 15 ug/L
> 30 ug/L
> 15 ug/L
> 30 ug/L
> 15 ug/L
Total # Systems
Reporting
5,191
5,191
730
730
5,921
5,921
# Systems Exceeding
Threshold of Interest
413
846
35
77
448
923
% Systems Exceeding
Threshold of Interest
7.956%
16.297%
4.795%
10.548%
7.566%
15.589%
Total Pop. Served by
Systems Reporting
23,338,623
23,338,623
47,292,769
47,292,769
70,631,392
70,631,392
Total Pop. Served by
Systems Exceeding
Threshold of Interest
1,240,188
5,684,077
7,153,925
13,809,436
8,394,113
19,493,513
% Pop. Served by
Systems Exceeding
Threshold of Interest
5.314%
24.355%
15.127%
29.200%
11.884%
27.599%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A67a. Uranium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
530
1,077
21,582
1,166
1,505
146
46
767
1,659
375
98
87
463
271
88
2,285
180
659
1,637
855
901
946
5
1,013
20
1,808
26
549
88
175
464
50
60
41,581
GW
462
830
13,666
971
1,383
131
46
725
1,658
317
81
87
463
271
81
2,030
164
631
1,257
808
806
814
0
805
20
1,662
25
506
79
164
434
38
46
31,461
SW
68
247
7,916
195
122
15
0
42
1
58
17
0
0
0
7
255
16
28
380
47
95
132
5
208
0
146
1
43
9
11
30
12
14
10,120
Percent of Samples
with Detections
Total
50.755%
86.815%
80.145%
60.034%
66.844%
40.411%
95.652%
74.837%
83.665%
89.333%
76.531%
100.000%
72.138%
65.314%
87.500%
40.044%
100.000%
85.736%
17.043%
90.760%
87.458%
83.404%
40.000%
59.131%
90.000%
3.319%
92.308%
66.120%
80.682%
68.571%
81.250%
2.000%
80.000%
70.542%
GW
57.143%
90.120%
80.214%
60.659%
70.644%
41.221%
95.652%
74.345%
83.655%
91.798%
71.605%
100.000%
72.138%
65.314%
87.654%
44.483%
100.000%
85.261%
18.218%
91.708%
87.841%
86.855%
63.230%
90.000%
3.550%
92.000%
67.589%
84.810%
72.561%
80.184%
2.632%
78.261%
70.227%
SW
7.353%
75.709%
80.028%
56.923%
23.770%
33.333%
0.000%
83.333%
100.000%
75.862%
100.000%
0.000%
0.000%
0.000%
85.714%
4.706%
100.000%
96.429%
13.158%
74.468%
84.211%
62.121%
40.000%
43.269%
0.000%
0.685%
100.000%
48.837%
44.444%
9.091%
96.667%
0.000%
85.714%
71.522%
Minimum Detect
Concentration (u.g/L)
Total
0.1
0.29
0.00299
0.00075
0.01
0.00149
1.04
0.00015
1.4E-05
0.14
1.04
0.02
0.16
1.3
0.00448
0.4
0.00001
0.29
0.00299
0.002
0.00015
0.0009
1.49
1.5E-06
5.85
1.49
8.5
2
0.14
0.15
0.03
27.61
0.00027
1.5E-06
GW
0.1
0.29
0.01
0.00075
0.01
0.00149
1.04
0.00015
1.4E-05
0.14
1.04
0.02
0.16
1.3
0.00448
0.4
0.00001
0.29
0.00299
0.002
0.00015
0.0009
1.5E-06
5.85
1.49
8.5
2
0.14
0.15
0.03
27.61
0.00027
1.5E-06
SW
0.2
0.83
0.00299
0.00149
1
0.44
0.00448
2.53
2
2.38
1.54
0.44
0.04
9.55
0.02
0.98
0.00358
0.01
1.49
0.002
31.49
16.1
2.1
1.2
0.15
0.23
0.6
0.00149
Median Detect
Concentration (u.g/L)
Total
0.3
4.17
8.44
10
2.38
1.19
4.025
11.94
0.38
24.77
5.67
44
1
4.17
15
17.31
1.55
32.68
1.04
5.7
5.96
2.71
1.49
0.11
14.79
24.395
15.55
12.4
21.6
2.09
2.23
27.61
6.5
6.8
GW
0.3
4.47
8.82
11
2.45
1.19
4.025
11.94
0.38
25
4.245
44
1
4.17
16
17.77
1.62
33.805
1.13
6
5.745
2.98
0.12
14.79
24.32
15
12.5
23.1
2.1
2.08
27.61
11.9
6.57
SW
0.2
3.2
7.76
7
2.24
0.74
13.43
2.53
22.115
15.37
8.7
3.13
0.8
14.47
0.31
3.8
8.65
1.335
1.49
0.03
31.49
16.1
10.5
1.6
0.15
4.17
2.85
7.31
90th Percentile Detect
Concentration (u.g/L)
Total
1.2
13.11
30.74
46
19.89
6.41
16.26
74.02
3.28
83.58
20.89
140
4.02
8.5
65
76.71
6.445
74.02
35.37
38
33
11.34
1.49
2.43
42.35
81.34
24.17
40.2
41.34
63.39
6.86
27.61
24.2
32.83
GW
1.2
14.75
32.98
46.26
20
6.41
16.26
77.61
3.28
86.56
19.1
140
4.02
8.5
65
76.71
6.6
76.56
41.79
39.93
33
11.7
2.83
42.35
85.07
24.17
40.7
43.13
69.2
6.56
27.61
27.5
35
SW
0.2
7.45
25.37
32.83
5.72
1.64
61.19
2.53
45
24.62
23
4.17
4.36
30.44
19.4
7.53
32
9
1.49
1
31.49
16.1
17.1
2.4
0.15
7.16
4.3
25.07
Maximum Detect
Concentration (u.g/L)
Total
11.64
69
425.37
268.65
343.87
21.94
32.23
191.04
18.35
183
27.46
469
28.95
23.28
79
298.5
23.5
252.23
380.59
164.17
294.02
150
1.49
36
89.01
127.31
28.35
175.4
67.76
87
104.47
27.61
35.2
469
GW
11.64
69
425.37
268.65
343.87
21.94
32.23
191.04
18.35
183
26.11
469
28.95
23.28
79
298.5
23.5
252.23
380.59
164.17
294.02
150
36
89.01
127.31
28.35
175.4
67.76
87
104.47
27.61
35.2
469
SW
0.2
24.3
244.77
160
6.79
1.64
77.61
2.53
101
27.46
23
5.67
4.63
37.91
25.37
11
53.73
16.86
1.49
8.04
31.49
16.1
26.5
2.4
0.15
7.91
5.5
244.77
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A67b. Uranium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
145
160
1,063
254
287
38
19
301
121
38
19
27
112
80
43
385
171
171
146
327
165
249
1
634
5
452
17
205
30
87
114
27
28
5,921
GW
122
151
860
198
269
32
19
292
120
33
18
27
112
80
38
328
155
169
117
302
155
206
0
504
5
405
16
200
28
78
112
17
23
5,191
SW
23
9
203
56
18
6
0
9
1
5
1
0
0
0
5
57
16
2
29
25
10
43
1
130
0
47
1
5
2
9
2
10
5
730
Total Population Served by Systems
Reporting
Total
94,606
4,008,876
30,756,273
2,980,899
1,466,952
3,503,799
28,641
682,916
766,197
118,830
328,268
5,703
730,523
88,067
20,290
3,636,665
533,303
302,725
6,379,628
1,427,921
532,264
559,318
215,517
2,604,897
4,217
3,021,859
137,188
3,472,887
155,849
81,508
1,783,743
38,980
162,083
70,631,392
GW
72,713
1,106,562
10,686,347
248,509
142,622
2,366,772
28,641
491,248
764,361
21,517
323,168
5,703
730,523
88,067
17,127
359,874
237,120
277,273
1,457,687
1,186,373
207,214
88,875
0
445,931
4,217
525,705
9,062
512,883
16,465
44,981
826,968
5,783
38,332
23,338,623
SW
21,893
2,902,314
20,069,926
2,732,390
1,324,330
1,137,027
0
191,668
1,836
97,313
5,100
0
0
0
3,163
3,276,791
296,183
25,452
4,921,941
241,548
325,050
470,443
215,517
2,158,966
0
2,496,154
128,126
2,960,004
139,384
36,527
956,775
33,197
123,751
47,292,769
Percent of Systems
with At Least One Detection
Total
51.724%
99.375%
88.241%
61.024%
82.578%
71.053%
94.737%
73.754%
83.471%
68.421%
73.684%
100.000%
87.500%
60.000%
83.721%
35.065%
100.000%
62.573%
49.315%
91.743%
90.303%
86.747%
100.000%
59.306%
60.000%
4.425%
88.235%
80.488%
73.333%
52.874%
84.211%
3.704%
89.286%
69.262%
GW
59.836%
99.338%
89.302%
62.121%
84.758%
68.750%
94.737%
73.288%
83.333%
72.727%
72.222%
100.000%
87.500%
60.000%
84.211%
39.329%
100.000%
62.130%
54.701%
94.371%
92.258%
92.718%
0.000%
64.484%
60.000%
4.691%
87.500%
80.000%
75.000%
57.692%
83.929%
5.882%
91.304%
71.528%
SW
8.696%
100.000%
83.744%
57.143%
50.000%
83.333%
0.000%
88.889%
100.000%
40.000%
100.000%
0.000%
0.000%
0.000%
80.000%
10.526%
100.000%
100.000%
27.586%
60.000%
60.000%
58.140%
100.000%
39.231%
0.000%
2.128%
100.000%
100.000%
50.000%
11.111%
100.000%
0.000%
80.000%
53.151%
Percent of Population Served
with At Least One Detection
Total
42.400%
99.994%
92.263%
84.537%
27.917%
87.091%
98.129%
89.333%
93.472%
9.855%
23.612%
100.000%
72.171%
87.439%
85.397%
41.533%
100.000%
79.409%
34.390%
96.200%
97.133%
91.436%
100.000%
60.548%
47.830%
0.824%
99.632%
96.791%
11.486%
36.928%
96.214%
0.231%
78.455%
77.256%
GW
53.444%
99.978%
89.017%
73.823%
80.565%
80.891%
98.129%
85.222%
93.457%
21.476%
22.406%
100.000%
72.171%
87.439%
93.577%
23.731%
100.000%
77.519%
52.635%
97.292%
94.766%
92.421%
0.000%
72.928%
47.830%
3.142%
94.427%
78.272%
45.363%
63.580%
91.834%
1.556%
99.251%
81.666%
SW
5.719%
100.000%
93.991%
85.511%
22.247%
99.998%
0.000%
99.870%
100.000%
7.286%
100.000%
0.000%
0.000%
0.000%
41.100%
43.488%
100.000%
100.000%
28.987%
90.835%
98.643%
91.250%
100.000%
57.991%
0.000%
0.336%
100.000%
100.000%
7.484%
4.107%
100.000%
0.000%
72.014%
75.079%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A67c. Uranium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 30 ug/L
Total
0
6
129
34
18
0
1
28
0
13
0
14
0
0
3
38
0
43
9
33
17
4
0
2
3
7
0
29
8
2
4
0
3
448
GW
0
6
105
30
18
0
1
27
0
11
0
14
0
0
3
38
0
41
9
33
16
4
0
2
3
6
0
29
8
2
4
0
3
413
SW
0
0
24
4
0
0
0
1
0
2
0
0
0
0
0
0
0
2
0
0
1
0
0
0
0
1
0
0
0
0
0
0
0
35
Percent of Systems
with At Least One Detection
> 30 ug/L
Total
0.000%
3.750%
12.135%
13.386%
6.272%
0.000%
5.263%
9.302%
0.000%
34.211%
0.000%
51.852%
0.000%
0.000%
6.977%
9.870%
0.000%
25.146%
6.164%
10.092%
10.303%
1.606%
0.000%
0.315%
60.000%
1.549%
0.000%
14.146%
26.667%
2.299%
3.509%
0.000%
10.714%
7.566%
GW
0.000%
3.974%
12.209%
15.152%
6.691%
0.000%
5.263%
9.247%
0.000%
33.333%
0.000%
51.852%
0.000%
0.000%
7.895%
11.585%
0.000%
24.260%
7.692%
10.927%
10.323%
1.942%
0.000%
0.397%
60.000%
1.481%
0.000%
14.500%
28.571%
2.564%
3.571%
0.000%
13.043%
7.956%
SW
0.000%
0.000%
11.823%
7.143%
0.000%
0.000%
0.000%
11.111%
0.000%
40.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
100.000%
0.000%
0.000%
10.000%
0.000%
0.000%
0.000%
0.000%
2.128%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
4.795%
Population Served by Systems
with At Least One Detection
> 30 ug/L
Total
0
16,123
7,453,544
120,267
3,273
0
863
252,364
0
9,977
0
2,364
0
0
472
18,284
0
178,042
18,580
130,515
104,230
3,322
0
578
2,017
10,945
0
40,152
3,422
489
23,973
0
317
8,394,113
GW
0
16,123
602,391
100,917
3,273
0
863
66,364
0
2,887
0
2,364
0
0
472
18,284
0
152,590
18,580
130,515
47,730
3,322
0
578
2,017
2,565
0
40,152
3,422
489
23,973
0
317
1,240,188
SW
0
0
6,851,153
19,350
0
0
0
186,000
0
7,090
0
0
0
0
0
0
0
25,452
0
0
56,500
0
0
0
0
8,380
0
0
0
0
0
0
0
7,153,925
Percent of Population Served
with At Least One Detection
> 30 ug/L
Total
0.000%
0.402%
24.234%
4.035%
0.223%
0.000%
3.013%
36.954%
0.000%
8.396%
0.000%
41.452%
0.000%
0.000%
2.326%
0.503%
0.000%
58.813%
0.291%
9.140%
19.582%
0.594%
0.000%
0.022%
47.830%
0.362%
0.000%
1.156%
2.196%
0.600%
1.344%
0.000%
0.196%
11.884%
GW
0.000%
1.457%
5.637%
40.609%
2.295%
0.000%
3.013%
13.509%
0.000%
13.417%
0.000%
41.452%
0.000%
0.000%
2.756%
5.081%
0.000%
55.032%
1.275%
11.001%
23.034%
3.738%
0.000%
0.130%
47.830%
0.488%
0.000%
7.829%
20.783%
1.087%
2.899%
0.000%
0.827%
5.314%
SW
0.000%
0.000%
34.136%
0.708%
0.000%
0.000%
0.000%
97.043%
0.000%
7.286%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
100.000%
0.000%
0.000%
17.382%
0.000%
0.000%
0.000%
0.000%
0.336%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
15.127%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A67d. Uranium — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 15 ug/L
Total
0
28
299
56
37
1
1
56
2
20
4
19
8
1
12
64
3
64
15
55
35
13
0
3
3
10
10
75
10
3
7
1
8
923
GW
0
27
246
50
37
1
1
55
2
18
3
19
8
1
10
64
3
62
13
55
33
12
0
3
3
9
9
73
10
3
7
1
8
846
SW
0
1
53
6
0
0
0
1
0
2
1
0
0
0
2
0
0
2
2
0
2
1
0
0
0
1
1
2
0
0
0
0
0
77
Percent of Systems
with At Least One Detection
> 15 ug/L
Total
0.000%
17.500%
28.128%
22.047%
12.892%
2.632%
5.263%
18.605%
1.653%
52.632%
21.053%
70.370%
7.143%
1.250%
27.907%
16.623%
1.754%
37.427%
10.274%
16.820%
21.212%
5.221%
0.000%
0.473%
60.000%
2.212%
58.824%
36.585%
33.333%
3.448%
6.140%
3.704%
28.571%
15.589%
GW
0.000%
17.881%
28.605%
25.253%
13.755%
3.125%
5.263%
18.836%
1.667%
54.545%
16.667%
70.370%
7.143%
1.250%
26.316%
19.512%
1.935%
36.686%
11.111%
18.212%
21.290%
5.825%
0.000%
0.595%
60.000%
2.222%
56.250%
36.500%
35.714%
3.846%
6.250%
5.882%
34.783%
16.297%
SW
0.000%
11.111%
26.108%
10.714%
0.000%
0.000%
0.000%
11.111%
0.000%
40.000%
100.000%
0.000%
0.000%
0.000%
40.000%
0.000%
0.000%
100.000%
6.897%
0.000%
20.000%
2.326%
0.000%
0.000%
0.000%
2.128%
100.000%
40.000%
0.000%
0.000%
0.000%
0.000%
0.000%
10.548%
Population Served by Systems
with At Least One Detection
> 15 ug/L
Total
0
842,488
13,899,989
183,520
8,797
37,227
863
384,679
25,850
10,456
17,305
2,606
25,428
11,224
5,436
23,297
2,684
205,629
354,726
140,273
128,503
16,837
0
723
2,017
11,975
133,595
2,955,865
4,172
909
52,475
90
3,875
19,493,513
GW
0
702,488
3,888,485
117,370
8,797
37,227
863
198,679
25,850
3,366
12,205
2,606
25,428
11,224
4,506
23,297
2,684
180,177
22,850
140,273
71,703
7,237
0
723
2,017
3,595
5,469
123,437
4,172
909
52,475
90
3,875
5,684,077
SW
0
140,000
10,011,504
66,150
0
0
0
186,000
0
7,090
5,100
0
0
0
930
0
0
25,452
331,876
0
56,800
9,600
0
0
0
8,380
128,126
2,832,428
0
0
0
0
0
13,809,436
Percent of Population Served
with At Least One Detection
> 15 ug/L
Total
0.000%
21.016%
45.194%
6.157%
0.600%
1.062%
3.013%
56.329%
3.374%
8.799%
5.272%
45.695%
3.481%
12.745%
26.792%
0.641%
0.503%
67.926%
5.560%
9.824%
24.143%
3.010%
0.000%
0.028%
47.830%
0.396%
97.381%
85.113%
2.677%
1.115%
2.942%
0.231%
2.391%
27.599%
GW
0.000%
63.484%
36.387%
47.230%
6.168%
1.573%
3.013%
40.444%
3.382%
15.643%
3.777%
45.695%
3.481%
12.745%
26.309%
6.474%
1.132%
64.982%
1.568%
11.824%
34.603%
8.143%
0.000%
0.162%
47.830%
0.684%
60.351%
24.067%
25.339%
2.021%
6.345%
1.556%
10.109%
24.355%
SW
0.000%
4.824%
49.883%
2.421%
0.000%
0.000%
0.000%
97.043%
0.000%
7.286%
100.000%
0.000%
0.000%
0.000%
29.402%
0.000%
0.000%
100.000%
6.743%
0.000%
17.474%
2.041%
0.000%
0.000%
0.000%
0.336%
100.000%
95.690%
0.000%
0.000%
0.000%
0.000%
0.000%
29.200%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A68. Vinyl Chloride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 2 ug/L
>lug/L
> 0.5 ug/L
> 2 ug/L
>lug/L
> 0.5 ug/L
> 2 ug/L
>lug/L
> 0.5 ug/L
Total # Systems
Reporting
46,158
46,158
46,158
4,253
4,253
4,253
50,411
50,411
50,411
# Systems Exceeding
Threshold of Interest
31
63
113
10
21
33
41
84
146
% Systems Exceeding
Threshold of Interest
0.067%
0.136%
0.245%
0.235%
0.494%
0.776%
0.081%
0.167%
0.290%
Total Pop. Served by
Systems Reporting
86,057,502
86,057,502
86,057,502
140,406,921
140,406,921
140,406,921
226,464,423
226,464,423
226,464,423
Total Pop. Served by
Systems Exceeding
Threshold of Interest
334,543
427,229
825,343
147,536
468,912
1,621,211
482,079
896,141
2,446,554
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.389%
0.496%
0.959%
0.105%
0.334%
1.155%
0.213%
0.396%
1.080%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A68a. Vinyl Chloride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,107
820
2,393
11,697
86,043
2,892
6,939
1,048
4,151
7,174
1,794
1,995
3,771
6,671
4,621
3,309
16,249
6,773
3,689
10,753
8,583
7,544
4,455
19,058
551
6,838
9,581
20,361
6,572
3,209
7,074
8,844
5,634
2,325
1,959
4,342
889
2,944
34,146
8,988
4,930
4,348
11,295
1,141
1,661
373,161
GW
1,969
596
1,926
9,539
45,407
2,151
6,048
1,018
4,083
6,347
1,691
1,846
3,310
6,185
4,311
1,126
12,259
5,511
3,374
9,743
7,336
6,695
3,916
17,478
416
6,262
9,103
18,574
6,096
2,577
5,411
7,683
4,199
1,683
1,591
3,803
855
1,166
27,044
7,557
4,058
3,955
11,170
445
1,158
288,671
SW
1,138
224
467
2,158
40,636
741
891
30
68
827
103
149
461
486
310
2,183
3,990
1,262
315
1,010
1,247
849
539
1,580
135
576
478
1,787
476
632
1,663
1,161
1,435
642
368
539
34
1,778
7,102
1,431
872
393
125
696
503
84,490
Percent of Samples
with Detections
Total
0.000%
0.122%
0.084%
0.274%
0.078%
0.000%
0.058%
0.095%
0.337%
0.070%
0.000%
0.301%
0.027%
0.270%
0.216%
0.151%
0.080%
0.354%
0.054%
0.046%
0.489%
0.318%
0.022%
0.084%
0.181%
0.058%
0.021%
0.157%
0.000%
0.000%
0.085%
0.294%
0.266%
0.000%
0.000%
0.230%
0.000%
0.102%
0.196%
0.078%
0.183%
0.046%
0.443%
2.016%
0.000%
0.147%
GW
0.000%
0.168%
0.104%
0.199%
0.024%
0.000%
0.050%
0.098%
0.343%
0.079%
0.000%
0.325%
0.030%
0.291%
0.232%
0.000%
0.049%
0.435%
0.059%
0.021%
0.573%
0.239%
0.026%
0.092%
0.240%
0.064%
0.022%
0.162%
0.000%
0.000%
0.074%
0.338%
0.357%
0.000%
0.000%
0.237%
0.000%
0.000%
0.111%
0.093%
0.123%
0.025%
0.448%
2.472%
0.000%
0.137%
SW
0.000%
0.000%
0.000%
0.602%
0.138%
0.000%
0.112%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.229%
0.175%
0.000%
0.000%
0.297%
0.000%
0.942%
0.000%
0.000%
0.000%
0.000%
0.000%
0.112%
0.000%
0.000%
0.120%
0.000%
0.000%
0.000%
0.000%
0.186%
0.000%
0.169%
0.521%
0.000%
0.459%
0.254%
0.000%
1.724%
0.000%
0.183%
Minimum Detect
Concentration (u.g/L)
Total
0.54
0.32
0.3
0.5
0.52
1.44
0.17
0.51
0.5
0.6
0.5
0.2
0.5
0.3
0.5
0.1
0.5
0.4
0.5
2.26
0.5
0.66
0.43
0.71
0.23
0.5
0.3
0.6
0.4
0.6
0.5
0.7
0.6
1.1
0.01
0.23
0.01
GW
0.54
0.32
0.3
0.6
0.52
1.44
0.17
0.51
0.5
0.6
0.5
0.2
0.5
0.5
0.1
0.5
0.4
0.5
2.26
0.5
0.66
0.43
0.71
0.23
0.5
0.3
0.6
0.53
0.5
0.7
0.8
1.1
0.01
0.23
0.01
SW
0.3
0.5
1
0.5
0.3
0.5
0.57
0.5
0.5
0.4
0.6
0.6
0.6
37.7
0.4
0.3
Median Detect
Concentration (u.g/L)
Total
0.54
0.69
0.3
1
0.635
1.44
0.88
0.86
6.9
0.6
0.92
0.5
0.5
0.6
1.3
0.55
0.6
0.9
1.09
2.26
0.8
0.66
0.89
1.255
1.195
0.5
0.77
3.11
2.35
0.8
1.6
0.7
1.1
19.4
0.5
0.5
0.89
GW
0.54
0.69
0.3
0.73
0.57
1.44
0.88
0.86
6.9
0.6
0.92
0.5
0.605
1.3
0.55
0.7
0.9
1.015
2.26
0.8
0.66
0.89
1.255
1.31
0.5
0.77
3.11
4.05
0.95
0.7
1.2
1.1
0.5
0.5
0.8
SW
0.3
1
1
0.5
0.59
0.6
1.12
0.55
0.5
0.4
0.8
2.1
1
37.7
1.46
1
90th Percentile Detect
Concentration (u.g/L)
Total
0.54
1.06
0.5
1.5
1
1.44
4.6
20
15
0.6
4
0.95
6
1.6
3.3
1
0.9
1.6
1.88
2.26
2.41
0.66
1.6
1.8
15.43
13.6
9.3
6.3
13.25
1.8
3.4
0.8
4.7
37.7
0.9
2.4
3.545
GW
0.54
1.06
0.3
1.6
0.7
1.44
4.6
20
15
0.6
4
0.95
5
3.3
1
0.9
1.6
1.88
2.26
2.41
0.66
1.6
1.8
19.04
13.6
9.3
6.3
17
6.05
0.8
4.7
1.1
0.9
0.5
4.6
SW
0.5
1.5
1
6
0.62
0.8
2.48
0.6
0.5
0.4
1.8
3.4
1.8
37.7
2.6
2.48
Maximum Detect
Concentration (u.g/L)
Total
0.54
1.06
0.9
5.6
1
1.44
4.98
20
15
0.6
6.2
1.2
6
5
3.8
1
0.9
3.1
2.64
2.26
2.57
0.66
1.6
1.8
46.5
13.6
9.7
20.6
17
1.8
20
0.8
4.7
37.7
3.59
3
46.5
GW
0.54
1.06
0.9
5.6
0.7
1.44
4.98
20
15
0.6
6.2
1.2
5
3.8
1
0.9
3.1
2.64
2.26
2.57
0.66
1.6
1.8
46.5
13.6
9.7
20.6
17
20
0.8
4.7
1.1
3.59
0.5
46.5
SW
0.5
2
1
6
0.62
0.8
2.48
0.6
0.5
0.4
1.8
3.6
1.8
37.7
3
37.7
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A68b. Vinyl Chloride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
619
263
454
1,059
3,651
827
1,207
318
1,509
1,822
106
1,056
935
1,401
1,474
241
718
1,054
810
2,972
1,582
1,417
848
2,367
210
771
1,258
1,398
727
338
1,523
1,944
730
1,097
145
819
245
351
4,951
500
1,600
603
1,784
403
304
50,411
GW
473
202
382
1,011
3,134
606
1,168
315
1,483
1,706
94
1,023
878
1,301
1,430
92
600
986
757
2,911
1,552
1,340
788
2,228
183
760
1,217
1,361
688
317
1,287
1,819
518
945
136
757
233
162
4,609
454
1,429
560
1,764
243
256
46,158
SW
146
61
72
48
517
221
39
3
26
116
12
33
57
100
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
236
125
212
152
9
62
12
189
342
46
171
43
20
160
48
4,253
Total Population Served by Systems
Reporting
Total
606,053
4,218,278
2,453,348
6,166,873
35,828,298
4,998,841
2,723,376
698,987
17,416,591
7,485,298
1,293,745
2,543,141
1,093,666
8,824,185
4,891,221
4,602,392
8,557,325
5,023,402
728,347
7,157,738
4,260,523
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,748,495
1,698,980
973,592
4,893,289
10,227,597
3,123,687
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,273,258
491,035
4,039,526
1,416,020
446,177
226,464,423
GW
232,450
1,123,190
910,322
2,796,282
13,515,837
531,207
389,454
417,587
15,170,549
1,592,517
1,239,117
1,434,515
837,604
2,758,065
2,571,485
375,363
1,749,901
1,025,295
292,773
1,977,882
3,010,848
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,712,549
1,432,432
283,701
1,042,687
3,132,660
664,833
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
630,675
227,067
2,347,782
237,670
129,229
86,057,502
SW
373,603
3,095,088
1,543,026
3,370,591
22,312,461
4,467,634
2,333,922
281,400
2,246,042
5,892,781
54,628
1,108,626
256,062
6,066,120
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,850,602
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,642,583
263,968
1,691,744
1,178,350
316,948
140,406,921
Percent of Systems
with At Least One Detection
Total
0.000%
0.380%
0.441%
1.605%
0.219%
0.000%
0.249%
0.314%
0.398%
0.165%
0.000%
0.284%
0.107%
0.642%
0.204%
2.075%
0.975%
0.474%
0.247%
0.168%
0.442%
1.553%
0.118%
0.338%
0.476%
0.389%
0.079%
0.572%
0.000%
0.000%
0.394%
0.206%
0.548%
0.000%
0.000%
0.488%
0.000%
0.855%
0.424%
0.400%
0.500%
0.332%
0.392%
3.474%
0.000%
0.411%
GW
0.000%
0.495%
0.524%
1.286%
0.191%
0.000%
0.171%
0.317%
0.405%
0.176%
0.000%
0.293%
0.114%
0.692%
0.210%
0.000%
0.667%
0.507%
0.264%
0.069%
0.451%
1.194%
0.127%
0.359%
0.546%
0.395%
0.082%
0.514%
0.000%
0.000%
0.311%
0.220%
0.772%
0.000%
0.000%
0.396%
0.000%
0.000%
0.304%
0.441%
0.280%
0.179%
0.397%
4.527%
0.000%
0.349%
SW
0.000%
0.000%
0.000%
8.333%
0.387%
0.000%
2.564%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
3.356%
2.542%
0.000%
0.000%
4.918%
0.000%
7.792%
0.000%
0.000%
0.000%
0.000%
0.000%
2.703%
0.000%
0.000%
0.847%
0.000%
0.000%
0.000%
0.000%
1.613%
0.000%
1.587%
2.047%
0.000%
2.339%
2.326%
0.000%
1.875%
0.000%
1.082%
Percent of Population Served
with At Least One Detection
Total
0.000%
0.011%
0.062%
10.149%
0.983%
0.000%
1.224%
0.109%
1.986%
0.030%
0.000%
0.443%
0.004%
0.073%
0.217%
2.411%
1.446%
0.065%
0.036%
2.468%
5.316%
19.775%
0.009%
0.225%
0.252%
0.232%
0.003%
5.357%
0.000%
0.000%
0.096%
0.031%
0.048%
0.000%
0.000%
0.320%
0.000%
1.810%
0.657%
0.042%
1.713%
0.296%
1.370%
2.193%
0.000%
1.558%
GW
0.000%
0.041%
0.167%
1.477%
0.074%
0.000%
0.046%
0.182%
2.280%
0.139%
0.000%
0.785%
0.005%
0.233%
0.413%
0.000%
1.535%
0.316%
0.089%
0.168%
7.522%
12.281%
0.019%
0.909%
0.551%
0.494%
0.008%
5.809%
0.000%
0.000%
0.421%
0.100%
0.226%
0.000%
0.000%
0.137%
0.000%
0.000%
0.481%
0.063%
0.626%
0.040%
2.358%
1.018%
0.000%
1.388%
SW
0.000%
0.000%
0.000%
17.342%
1.533%
0.000%
1.420%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.626%
1.423%
0.000%
0.000%
3.346%
0.000%
29.409%
0.000%
0.000%
0.000%
0.000%
0.000%
5.114%
0.000%
0.000%
0.008%
0.000%
0.000%
0.000%
0.000%
0.371%
0.000%
2.437%
0.760%
0.000%
1.860%
0.517%
0.000%
2.430%
0.000%
1.663%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A68c. Vinyl Chloride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 2 ug/L
Total
0
0
0
0
1
0
0
0
2
1
0
2
0
3
0
1
1
1
0
0
2
2
1
2
0
0
0
2
0
0
1
2
1
0
0
1
0
0
11
0
1
1
1
1
0
41
GW
0
0
0
0
1
0
0
0
2
1
0
2
0
3
0
0
1
1
0
0
2
1
1
2
0
0
0
2
0
0
1
2
1
0
0
1
0
0
5
0
1
0
1
0
0
31
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6
0
0
1
0
1
0
10
Percent of Systems
with At Least One Detection
> 2 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.027%
0.000%
0.000%
0.000%
0.133%
0.055%
0.000%
0.189%
0.000%
0.214%
0.000%
0.415%
0.139%
0.095%
0.000%
0.000%
0.126%
0.141%
0.118%
0.084%
0.000%
0.000%
0.000%
0.143%
0.000%
0.000%
0.066%
0.103%
0.137%
0.000%
0.000%
0.122%
0.000%
0.000%
0.222%
0.000%
0.063%
0.166%
0.056%
0.248%
0.000%
0.081%
GW
0.000%
0.000%
0.000%
0.000%
0.032%
0.000%
0.000%
0.000%
0.135%
0.059%
0.000%
0.196%
0.000%
0.231%
0.000%
0.000%
0.167%
0.101%
0.000%
0.000%
0.129%
0.075%
0.127%
0.090%
0.000%
0.000%
0.000%
0.147%
0.000%
0.000%
0.078%
0.110%
0.193%
0.000%
0.000%
0.132%
0.000%
0.000%
0.108%
0.000%
0.070%
0.000%
0.057%
0.000%
0.000%
0.067%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.671%
0.000%
0.000%
0.000%
0.000%
0.000%
1.299%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.754%
0.000%
0.000%
2.326%
0.000%
0.625%
0.000%
0.235%
Population Served by Systems
with At Least One Detection
> 2 ug/L
Total
0
0
0
0
45
0
0
0
197,826
700
0
9,987
0
745
0
1,617
2,500
150
0
0
92,282
2,272
71
14,356
0
0
0
80
0
0
1,685
1,763
250
0
0
281
0
0
131,567
0
50
1,365
25
22,462
0
482,079
GW
0
0
0
0
45
0
0
0
197,826
700
0
9,987
0
745
0
0
2,500
150
0
0
92,282
272
71
14,356
0
0
0
80
0
0
1,685
1,763
250
0
0
281
0
0
11,475
0
50
0
25
0
0
334,543
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1,617
0
0
0
0
0
2,000
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
120,092
0
0
1,365
0
22,462
0
147,536
Percent of Population Served
with At Least One Detection
> 2 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.136%
0.009%
0.000%
0.393%
0.000%
0.008%
0.000%
0.035%
0.029%
0.003%
0.000%
0.000%
2.166%
0.076%
0.009%
0.205%
0.000%
0.000%
0.000%
0.001%
0.000%
0.000%
0.034%
0.017%
0.008%
0.000%
0.000%
0.008%
0.000%
0.000%
0.524%
0.000%
0.001%
0.278%
0.001%
1.586%
0.000%
0.213%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.304%
0.044%
0.000%
0.696%
0.000%
0.027%
0.000%
0.000%
0.143%
0.015%
0.000%
0.000%
3.065%
0.016%
0.019%
0.828%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.162%
0.056%
0.038%
0.000%
0.000%
0.038%
0.000%
0.000%
0.123%
0.000%
0.008%
0.000%
0.001%
0.000%
0.000%
0.389%
SW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.038%
0.000%
0.000%
0.000%
0.000%
0.000%
0.152%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.759%
0.000%
0.000%
0.517%
0.000%
1.906%
0.000%
0.105%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A68d. Vinyl Chloride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
>lug/L
Total
0
0
1
0
4
0
1
1
2
1
0
2
0
5
1
2
2
4
1
0
2
12
1
4
0
2
1
3
0
0
1
2
2
0
0
1
0
1
15
0
5
2
1
2
0
84
GW
0
0
1
0
3
0
0
1
2
1
0
2
0
5
1
0
2
4
1
0
2
8
1
4
0
2
1
3
0
0
1
2
2
0
0
1
0
0
8
0
3
1
1
0
0
63
SW
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
2
0
0
0
0
0
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
7
0
2
1
0
2
0
21
Percent of Systems
with At Least One Detection
>lug/L
Total
0.000%
0.000%
0.220%
0.000%
0.110%
0.000%
0.083%
0.314%
0.133%
0.055%
0.000%
0.189%
0.000%
0.357%
0.068%
0.830%
0.279%
0.380%
0.123%
0.000%
0.126%
0.847%
0.118%
0.169%
0.000%
0.259%
0.079%
0.215%
0.000%
0.000%
0.066%
0.103%
0.274%
0.000%
0.000%
0.122%
0.000%
0.285%
0.303%
0.000%
0.313%
0.332%
0.056%
0.496%
0.000%
0.167%
GW
0.000%
0.000%
0.262%
0.000%
0.096%
0.000%
0.000%
0.317%
0.135%
0.059%
0.000%
0.196%
0.000%
0.384%
0.070%
0.000%
0.333%
0.406%
0.132%
0.000%
0.129%
0.597%
0.127%
0.180%
0.000%
0.263%
0.082%
0.220%
0.000%
0.000%
0.078%
0.110%
0.386%
0.000%
0.000%
0.132%
0.000%
0.000%
0.174%
0.000%
0.210%
0.179%
0.057%
0.000%
0.000%
0.136%
SW
0.000%
0.000%
0.000%
0.000%
0.193%
0.000%
2.564%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.342%
0.000%
0.000%
0.000%
0.000%
0.000%
5.195%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.529%
2.047%
0.000%
1.170%
2.326%
0.000%
1.250%
0.000%
0.494%
Population Served by Systems
with At Least One Detection
> 1 ug/L
Total
0
0
357
0
208,600
0
33,143
760
197,826
700
0
9,987
0
1,538
10,452
50,417
2,545
2,190
215
0
92,282
41,197
71
14,522
0
163
30
20,080
0
0
1,685
1,763
390
0
0
281
0
2,900
152,355
0
23,950
1,455
25
24,262
0
896,141
GW
0
0
357
0
8,600
0
0
760
197,826
700
0
9,987
0
1,538
10,452
0
2,545
2,190
215
0
92,282
26,064
71
14,522
0
163
30
20,080
0
0
1,685
1,763
390
0
0
281
0
0
32,163
0
2,450
90
25
0
0
427,229
SW
0
0
0
0
200,000
0
33,143
0
0
0
0
0
0
0
0
50,417
0
0
0
0
0
15,133
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2,900
120,192
0
21,500
1,365
0
24,262
0
468,912
Percent of Population Served
with At Least One Detection
> 1 ug/L
Total
0.000%
0.000%
0.015%
0.000%
0.582%
0.000%
1.217%
0.109%
1.136%
0.009%
0.000%
0.393%
0.000%
0.017%
0.214%
1.095%
0.030%
0.044%
0.030%
0.000%
2.166%
1.371%
0.009%
0.208%
0.000%
0.011%
0.003%
0.259%
0.000%
0.000%
0.034%
0.017%
0.012%
0.000%
0.000%
0.008%
0.000%
0.051%
0.607%
0.000%
0.454%
0.296%
0.001%
1.713%
0.000%
0.396%
GW
0.000%
0.000%
0.039%
0.000%
0.064%
0.000%
0.000%
0.182%
1.304%
0.044%
0.000%
0.696%
0.000%
0.056%
0.406%
0.000%
0.145%
0.214%
0.073%
0.000%
3.065%
1.543%
0.019%
0.838%
0.000%
0.024%
0.008%
0.740%
0.000%
0.000%
0.162%
0.056%
0.059%
0.000%
0.000%
0.038%
0.000%
0.000%
0.346%
0.000%
0.388%
0.040%
0.001%
0.000%
0.000%
0.496%
SW
0.000%
0.000%
0.000%
0.000%
0.896%
0.000%
1.420%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.193%
0.000%
0.000%
0.000%
0.000%
0.000%
1.151%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.069%
0.760%
0.000%
0.463%
0.517%
0.000%
2.059%
0.000%
0.334%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A68e. Vinyl Chloride — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 0.5 ug/L
Total
0
1
1
1
8
0
3
1
3
3
0
2
1
8
2
2
5
4
1
3
4
19
1
8
1
3
1
5
0
0
1
3
4
0
0
3
0
3
21
2
8
2
6
2
0
146
GW
0
1
1
1
6
0
2
1
3
3
0
2
1
8
2
0
3
4
1
1
4
13
1
8
1
3
1
4
0
0
1
3
4
0
0
3
0
0
14
2
4
1
6
0
0
113
SW
0
0
0
0
2
0
1
0
0
0
0
0
0
0
0
2
2
0
0
2
0
6
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
3
7
0
4
1
0
2
0
33
Percent of Systems
with At Least One Detection
> 0.5 ug/L
Total
0.000%
0.380%
0.220%
0.094%
0.219%
0.000%
0.249%
0.314%
0.199%
0.165%
0.000%
0.189%
0.107%
0.571%
0.136%
0.830%
0.696%
0.380%
0.123%
0.101%
0.253%
1.341%
0.118%
0.338%
0.476%
0.389%
0.079%
0.358%
0.000%
0.000%
0.066%
0.154%
0.548%
0.000%
0.000%
0.366%
0.000%
0.855%
0.424%
0.400%
0.500%
0.332%
0.336%
0.496%
0.000%
0.290%
GW
0.000%
0.495%
0.262%
0.099%
0.191%
0.000%
0.171%
0.317%
0.202%
0.176%
0.000%
0.196%
0.114%
0.615%
0.140%
0.000%
0.500%
0.406%
0.132%
0.034%
0.258%
0.970%
0.127%
0.359%
0.546%
0.395%
0.082%
0.294%
0.000%
0.000%
0.078%
0.165%
0.772%
0.000%
0.000%
0.396%
0.000%
0.000%
0.304%
0.441%
0.280%
0.179%
0.340%
0.000%
0.000%
0.245%
SW
0.000%
0.000%
0.000%
0.000%
0.387%
0.000%
2.564%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.342%
1.695%
0.000%
0.000%
3.279%
0.000%
7.792%
0.000%
0.000%
0.000%
0.000%
0.000%
2.703%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.587%
2.047%
0.000%
2.339%
2.326%
0.000%
1.250%
0.000%
0.776%
Population Served by Systems
with At Least One Detection
> 0.5 ug/L
Total
0
456
357
66
352,030
0
33,323
760
214,626
2,220
0
9,987
40
3,439
10,562
50,417
72,530
2,190
215
173,554
221,734
503,012
71
15,754
1,417
3,389
30
327,620
0
0
1,685
3,103
1,501
0
0
1,006
0
102,900
164,899
1,070
90,322
1,455
54,552
24,262
0
2,446,554
GW
0
456
357
66
10,030
0
180
760
214,626
2,220
0
9,987
40
3,439
10,562
0
26,464
2,190
215
3,173
221,734
116,439
71
15,754
1,417
3,389
30
70,080
0
0
1,685
3,103
1,501
0
0
1,006
0
0
44,707
1,070
3,950
90
54,552
0
0
825,343
SW
0
0
0
0
342,000
0
33,143
0
0
0
0
0
0
0
0
50,417
46,066
0
0
170,381
0
386,573
0
0
0
0
0
257,540
0
0
0
0
0
0
0
0
0
102,900
120,192
0
86,372
1,365
0
24,262
0
1,621,211
Percent of Population Served
with At Least One Detection
> 0.5 ug/L
Total
0.000%
0.011%
0.015%
0.001%
0.983%
0.000%
1.224%
0.109%
1.232%
0.030%
0.000%
0.393%
0.004%
0.039%
0.216%
1.095%
0.848%
0.044%
0.030%
2.425%
5.204%
16.744%
0.009%
0.225%
0.252%
0.232%
0.003%
4.228%
0.000%
0.000%
0.034%
0.030%
0.048%
0.000%
0.000%
0.030%
0.000%
1.810%
0.657%
0.042%
1.713%
0.296%
1.350%
1.713%
0.000%
1.080%
GW
0.000%
0.041%
0.039%
0.002%
0.074%
0.000%
0.046%
0.182%
1.415%
0.139%
0.000%
0.696%
0.005%
0.125%
0.411%
0.000%
1.512%
0.214%
0.073%
0.160%
7.365%
6.891%
0.019%
0.909%
0.551%
0.494%
0.008%
2.584%
0.000%
0.000%
0.162%
0.099%
0.226%
0.000%
0.000%
0.137%
0.000%
0.000%
0.481%
0.063%
0.626%
0.040%
2.324%
0.000%
0.000%
0.959%
SW
0.000%
0.000%
0.000%
0.000%
1.533%
0.000%
1.420%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
1.193%
0.677%
0.000%
0.000%
3.289%
0.000%
29.409%
0.000%
0.000%
0.000%
0.000%
0.000%
5.114%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
2.437%
0.760%
0.000%
1.860%
0.517%
0.000%
2.059%
0.000%
1.155%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Table A69. Xylenes (Total) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Concentration
or Threshold
of Interest
> 10,000 ug/L
> 5,000 ug/L
> 1,000 ug/L
> 10,000 ug/L
> 5,000 ug/L
> 1,000 ug/L
> 10,000 ug/L
> 5,000 ug/L
> 1,000 ug/L
Total # Systems
Reporting
43,726
43,726
43,726
3,972
3,972
3,972
47,698
47,698
47,698
# Systems Exceeding
Threshold of Interest
0
0
9
0
0
1
0
0
10
% Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.021%
0.000%
0.000%
0.025%
0.000%
0.000%
0.021%
Total Pop. Served by
Systems Reporting
83,748,512
83,748,512
83,748,512
134,323,023
134,323,023
134,323,023
218,071,535
218,071,535
218,071,535
Total Pop. Served by
Systems Exceeding
Threshold of Interest
0
0
2,344
0
0
1,785
0
0
4,129
% Pop. Served by
Systems Exceeding
Threshold of Interest
0.000%
0.000%
0.003%
0.000%
0.000%
0.001%
0.000%
0.000%
0.002%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A69a. Xylenes (Total) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Records
Total
3,385
904
2,393
11,736
83,594
2,975
146
1,056
4,241
7,172
2,217
3,741
7,194
4,622
2,988
16,249
6,763
3,362
19,359
8,693
7,543
4,494
19,072
570
6,838
9,584
19,767
6,547
3,139
25
8,832
5,636
2,344
1,953
4,333
886
2,945
34,162
8,981
4,918
3,995
11,300
1,143
1,669
363,466
GW
2,220
669
1,926
9,562
43,873
2,213
144
1,026
4,173
6,346
2,058
3,280
6,601
4,312
1,000
12,259
5,509
3,079
17,522
7,423
6,694
3,952
17,491
434
6,262
9,106
18,015
6,071
2,508
22
7,676
4,200
1,689
1,585
3,800
852
1,164
27,058
7,550
4,045
3,633
11,176
444
1,165
281,787
SW
1,165
235
467
2,174
39,721
762
2
30
68
826
159
461
593
310
1,988
3,990
1,254
283
1,837
1,270
849
542
1,581
136
576
478
1,752
476
631
3
1,156
1,436
655
368
533
34
1,781
7,104
1,431
873
362
124
699
504
81,679
Percent of Samples
with Detections
Total
6.204%
12.168%
6.143%
3.391%
0.206%
5.849%
2.055%
2.652%
4.150%
6.762%
11.412%
0.508%
7.034%
1.125%
2.644%
0.769%
2.455%
0.684%
1.612%
7.765%
3.301%
1.090%
8.054%
9.123%
0.775%
0.355%
0.890%
1.466%
0.828%
24.000%
2.638%
4.418%
1.280%
0.819%
40.157%
1.580%
0.340%
0.266%
0.557%
4.107%
0.125%
1.522%
2.800%
2.217%
2.551%
GW
2.883%
14.499%
7.113%
3.639%
0.157%
6.055%
2.083%
2.729%
4.218%
7.501%
11.224%
0.549%
7.514%
1.020%
2.000%
0.710%
2.868%
0.390%
0.965%
6.588%
3.257%
0.987%
8.684%
10.599%
0.671%
0.373%
0.916%
1.417%
0.797%
27.273%
2.619%
4.500%
0.414%
0.505%
40.289%
1.643%
0.601%
0.288%
0.503%
4.598%
0.138%
1.539%
4.730%
2.747%
2.811%
SW
12.532%
5.532%
2.141%
2.300%
0.259%
5.249%
0.000%
0.000%
0.000%
1.090%
13.836%
0.217%
1.686%
2.581%
2.968%
0.952%
0.638%
3.887%
7.784%
14.646%
3.651%
1.845%
1.075%
4.412%
1.910%
0.000%
0.628%
2.101%
0.951%
0.000%
2.768%
4.178%
3.511%
2.174%
39.212%
0.000%
0.168%
0.183%
0.839%
1.833%
0.000%
0.000%
1.574%
0.992%
1.654%
Minimum Detect
Concentration (u.g/L)
Total
0.18
0.51
0.21
0.5
0.25
0.06
0.78
0.56
0.08
0.5
0.1
0.3
0.5
0.5
0.002
0.5
0.3
0.9
0.06
0.2
0.5
0.44
0.5
0.5
0.33
0.5
0.12
0.14
0.74
0.5
0.01
0.34
0.6
0.7
0.3
1.28
0.55
1.88
0.3
0.5
0.2
0.02
0.25
0.5
0.002
GW
0.18
0.52
0.21
0.5
0.25
0.06
0.78
0.56
0.08
0.5
0.1
0.3
0.5
0.5
0.3
0.5
0.5
1
0.06
0.2
0.5
0.44
0.5
0.5
0.33
0.5
0.12
0.14
0.74
0.5
0.01
0.5
1
0.7
0.3
1.28
0.76
1.88
0.3
0.5
0.2
0.02
0.25
0.5
0.01
SW
0.2
0.51
0.5
0.5
0.5
0.3
0.5
0.5
11.6
0.6
0.55
0.002
0.52
0.3
0.9
0.5
0.2
0.5
1.1
0.57
0.61
0.34
0.3
0.2
0.9
0.5
0.34
0.6
0.95
1
0.55
2.23
0.7
0.5
0.5
0.56
0.002
Median Detect
Concentration (u.g/L)
Total
2.285
1.385
1.26
2
1.2
1.7
2.2
3.44
1.45
1.6
1
1.1
1.175
1.45
1
1.56
2.95
2.2
1
0.7
1.89
4
2.2
1.02
1.3
1.765
1.35
1.2
2.7
1.31
1.7
1.7
2
5.3
1
2.415
1.05
4.85
1.8
3.25
3.1
0.88
0.82
1.7
1.1
GW
1.38
1.51
1.26
2
1.4
1.4
2.2
3.44
1.45
1.6
1
1.1
1.185
1.3
2.55
1.5
3.1
1.95
1
0.7
2.1
4
2.2
1.075
1.765
1.765
1.25
1.35
2.7
1.31
2.1
1.9
2.9
3.8
1
2.415
1.1
5.415
1.8
3.2
3.1
0.88
0.6
2.05
1.1
SW
2.93
0.7
1.465
1.5
1
2.5
1.7
1
11.6
0.835
2.095
0.8
1.825
1.55
2.8
0.8
0.8
1
4.95
1.3
0.79
0.75
1.9
0.93
4.2
0.9
1.46
1.4
6.925
1
1
3.55
4.3
3.75
1.3
1.03
1
90th Percentile Detect
Concentration (u.g/L)
Total
80.5
15.575
6.49
10
8.3
10.5
9.1
83.5
8.4
6
6.1
600
5.4
6.1
11
6.6
12.8
9.2
5.5
3.2
10.3
27
14.8
5.77
11.6
19.3
6.8
7.4
36.9
7.6
16.6
12.4
305
14
1
3.7
3.85
15.76
68.3
19
29.6
4.8
4
13
8.1
GW
4.98
16.27
6.53
9.1
6.9
10
9.1
83.5
8.4
6
6.1
600
5.5
6.1
20.75
5.6
13
10.2
6.4
3.3
11.1
30
15
9.8
12.8
19.3
6.6
8.07
60.3
7.6
22
14.6
600
14
1
3.7
5.2
19.54
69.5
18
29.6
4.8
3.11
13
8.1
SW
167
2.9
3.51
25
13.2
11.5
5.6
4.3
11.6
1.845
13.8
4
15.6
5.6
6.7
4.8
3
2
7.3
5.3
1.2
1.76
11.4
2.385
10.8
2.3
7.51
10
35.1
1
2.5
5.42
15.3
28
4
2.3
8.3
Maximum Detect
Concentration (u.g/L)
Total
506
194.9
34.6
480
79
2800
9.1
259
1300
58
4000
2100
800
43
66
53
39.9
16.5
800
199
239
2400
2220
242
30.1
71
300
104
1400
7.6
327
117.9
1860
35.1
600
5.25
5.2
318.56
490
320
29.6
1420
10.1
41
4000
GW
73
194.9
34.6
191
62
2800
9.1
259
1300
58
4000
2100
800
43
66
30
39.9
16.5
800
199
239
2400
2220
242
30.1
71
300
104
1400
7.6
327
117.9
600
14
600
5.25
5.2
318.56
140
320
29.6
1420
4.1
41
4000
SW
506
20
3.93
480
79
17.9
5.6
37
11.6
2.29
13.8
20.7
53
5.6
9.2
23.2
61
18.6
7.6
15.2
1.2
2.33
25
2.7
10.8
6.8
38.5
1860
35.1
6.06
2.5
14.52
490
47
10.1
2.3
1860
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A69b. Xylenes (Total) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Total Number of Systems Reporting
Total
620
266
454
1,058
3,626
829
110
318
1,520
1,822
1,057
935
1,428
1,474
241
718
1,054
807
2,972
1,584
1,417
848
2,367
210
771
1,258
1,392
724
338
12
1,944
730
1,097
145
819
245
351
4,951
500
1,596
600
1,784
402
304
47,698
GW
474
204
382
1,010
3,111
608
109
315
1,494
1,706
1,024
878
1,324
1,430
92
600
986
754
2,911
1,554
1,340
788
2,228
183
760
1,217
1,355
685
317
10
1,819
518
945
136
757
233
162
4,609
454
1,425
557
1,764
242
256
43,726
SW
146
62
72
48
515
221
1
3
26
116
33
57
104
44
149
118
68
53
61
30
77
60
139
27
11
41
37
39
21
2
125
212
152
9
62
12
189
342
46
171
43
20
160
48
3,972
Total Population Served by Systems
Reporting
Total
606,193
4,230,338
2,453,348
6,166,773
35,825,523
5,000,031
30,258
698,987
17,504,412
7,485,298
2,543,315
1,093,666
9,214,706
4,891,221
4,602,392
8,557,325
5,023,402
728,215
7,157,738
4,260,894
3,004,094
757,949
6,998,123
562,397
1,462,181
948,788
7,746,465
1,690,690
973,592
8,865
10,227,597
3,123,687
2,940,119
913,884
3,356,831
266,416
5,685,258
25,111,902
2,553,197
5,272,971
490,811
4,039,526
1,415,980
446,177
218,071,535
GW
232,590
1,124,693
910,322
2,796,182
13,513,182
532,397
23,638
417,587
15,258,370
1,592,517
1,434,689
837,604
3,014,309
2,571,485
375,363
1,749,901
1,025,295
292,641
1,977,882
3,011,219
1,689,633
365,280
1,732,957
257,172
685,701
398,989
2,710,519
1,424,142
283,701
4,945
3,132,660
664,833
574,689
173,906
732,879
194,218
1,462,502
9,297,171
1,698,877
630,388
226,843
2,347,782
237,630
129,229
83,748,512
SW
373,603
3,105,645
1,543,026
3,370,591
22,312,341
4,467,634
6,620
281,400
2,246,042
5,892,781
1,108,626
256,062
6,200,397
2,319,736
4,227,029
6,807,424
3,998,107
435,574
5,179,856
1,249,675
1,314,461
392,669
5,265,166
305,225
776,480
549,799
5,035,946
266,548
689,891
3,920
7,094,937
2,458,854
2,365,430
739,978
2,623,952
72,198
4,222,756
15,814,731
854,320
4,642,583
263,968
1,691,744
1,178,350
316,948
134,323,023
Percent of Systems
with At Least One Detection
Total
11.129%
21.053%
11.233%
12.382%
2.206%
10.374%
1.818%
5.660%
5.000%
8.123%
14.191%
1.070%
10.784%
1.696%
20.332%
8.078%
6.072%
1.611%
2.927%
17.992%
10.092%
2.123%
20.110%
19.048%
4.280%
1.908%
6.250%
7.320%
4.438%
41.667%
5.350%
10.685%
1.550%
6.207%
72.772%
2.041%
1.994%
1.232%
3.200%
5.639%
0.667%
4.484%
6.468%
7.237%
7.592%
GW
6.118%
23.529%
12.565%
11.584%
1.446%
11.513%
1.835%
5.714%
5.087%
8.499%
13.574%
1.025%
11.329%
1.608%
14.130%
6.833%
6.085%
1.459%
2.267%
16.988%
9.254%
1.650%
20.826%
19.126%
3.816%
1.972%
6.125%
7.007%
3.785%
50.000%
4.728%
11.004%
0.741%
4.412%
71.731%
2.146%
2.469%
1.085%
3.084%
5.684%
0.718%
4.535%
6.612%
6.641%
7.275%
SW
27.397%
12.903%
4.167%
29.167%
6.796%
7.240%
0.000%
0.000%
0.000%
2.586%
33.333%
1.754%
3.846%
4.545%
24.161%
14.407%
5.882%
3.774%
34.426%
70.000%
24.675%
8.333%
8.633%
18.519%
36.364%
0.000%
10.811%
12.821%
14.286%
0.000%
14.400%
9.906%
6.579%
33.333%
85.484%
0.000%
1.587%
3.216%
4.348%
5.263%
0.000%
0.000%
6.250%
10.417%
11.078%
Percent of Population Served
with At Least One Detection
Total
7.842%
18.185%
4.089%
32.122%
31.037%
4.132%
0.687%
18.897%
4.071%
6.656%
16.461%
4.892%
5.133%
3.380%
21.628%
6.905%
36.067%
19.511%
57.568%
48.687%
13.389%
4.375%
24.297%
6.209%
4.928%
0.633%
17.118%
43.697%
27.034%
5.753%
20.719%
3.884%
1.317%
23.796%
93.601%
2.048%
2.278%
1.412%
8.735%
4.252%
0.273%
11.234%
3.297%
11.470%
17.480%
GW
6.903%
27.024%
9.243%
42.836%
7.723%
23.437%
0.880%
31.631%
4.670%
24.580%
17.157%
6.325%
15.334%
6.390%
9.444%
14.424%
7.908%
1.141%
22.311%
45.335%
18.111%
4.781%
37.518%
11.612%
8.617%
1.504%
20.126%
50.692%
5.191%
10.313%
2.928%
9.590%
0.602%
41.287%
80.116%
2.809%
0.909%
1.701%
3.781%
12.464%
0.591%
19.330%
3.387%
7.933%
13.222%
SW
8.427%
14.984%
1.049%
23.233%
45.156%
1.831%
0.000%
0.000%
0.000%
1.812%
15.559%
0.205%
0.174%
0.042%
22.710%
4.972%
43.288%
31.853%
71.030%
56.762%
7.320%
3.998%
19.946%
1.656%
1.670%
0.000%
15.499%
6.323%
36.016%
0.000%
28.575%
2.341%
1.490%
19.685%
97.367%
0.000%
2.752%
1.243%
18.586%
3.137%
0.000%
0.000%
3.279%
12.912%
20.134%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A69c. Xylenes (Total) —Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 10,000 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 10,000 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 10,000 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 10,000 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A69d. Xylenes (Total) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 5,000 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Systems
with At Least One Detection
> 5,000 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Population Served by Systems
with At Least One Detection
> 5,000 ug/L
Total
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Percent of Population Served
with At Least One Detection
> 5,000 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix A - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table A69e. Xylenes (Total) — Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
State
AK
AL
AR
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KY
MA
MD
ME
Ml
MN
MO
MT
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
Rl
SC
SD
TN
TX
UT
VA
VT
Wl
WV
WY
Total
Number of Systems
with At Least One Detection
> 1,000 ug/L
Total
0
0
0
0
0
1
0
0
1
0
1
1
0
0
0
0
0
0
0
0
0
1
2
0
0
0
0
0
1
0
0
0
1
0
0
0
0
0
0
0
0
1
0
0
10
GW
0
0
0
0
0
1
0
0
1
0
1
1
0
0
0
0
0
0
0
0
0
1
2
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
9
sw
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
Percent of Systems
with At Least One Detection
> 1,000 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.121%
0.000%
0.000%
0.066%
0.000%
0.095%
0.107%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.118%
0.084%
0.000%
0.000%
0.000%
0.000%
0.000%
0.296%
0.000%
0.000%
0.000%
0.091%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.056%
0.000%
0.000%
0.021%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.164%
0.000%
0.000%
0.067%
0.000%
0.098%
0.114%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.127%
0.090%
0.000%
0.000%
0.000%
0.000%
0.000%
0.315%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.057%
0.000%
0.000%
0.021%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.658%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.025%
Population Served by Systems
with At Least One Detection
> 1,000 ug/L
Total
0
0
0
0
0
320
0
0
100
0
1,074
200
0
0
0
0
0
0
0
0
0
165
317
0
0
0
0
0
100
0
0
0
1,785
0
0
0
0
0
0
0
0
68
0
0
4,129
GW
0
0
0
0
0
320
0
0
100
0
1,074
200
0
0
0
0
0
0
0
0
0
165
317
0
0
0
0
0
100
0
0
0
0
0
0
0
0
0
0
0
0
68
0
0
2,344
SW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1,785
0
0
0
0
0
0
0
0
0
0
0
1,785
Percent of Population Served
with At Least One Detection
> 1,000 ug/L
Total
0.000%
0.000%
0.000%
0.000%
0.000%
0.006%
0.000%
0.000%
0.001%
0.000%
0.042%
0.018%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.022%
0.005%
0.000%
0.000%
0.000%
0.000%
0.000%
0.010%
0.000%
0.000%
0.000%
0.061%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.002%
0.000%
0.000%
0.002%
GW
0.000%
0.000%
0.000%
0.000%
0.000%
0.060%
0.000%
0.000%
0.001%
0.000%
0.075%
0.024%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.045%
0.018%
0.000%
0.000%
0.000%
0.000%
0.000%
0.035%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.000%
0.000%
0.003%
sw
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.075%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.001%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Table B1. Benzene - Summary of the Stage 2 Analyses
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 5 Hg/L
> 2.5 ng/L
> 1 Mi/L.
> 0.5 ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L.
> 0.5 ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L
> 0.5 ng/L
Total #
Systems
46,177
46,177
46,177
46,177
4,258
4,258
4,258
4,258
50,435
50,435
50,435
50,435
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
9
15
67
264
1
1
3
37
10
16
70
301
Arithmetic
System Mean
using 1/2 MRL
9
13
55
114
1
1
3
9
10
14
58
123
Arithmetic
System Mean
using 0
9
13
49
90
1
1
3
5
10
14
52
95
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.019%
0.032%
0.145%
0.572%
0.023%
0.023%
0.070%
0.869%
0.020%
0.032%
0.139%
0.597%
Arithmetic
System Mean
using 1/2 MRL
0.019%
0.028%
0.119%
0.247%
0.023%
0.023%
0.070%
0.211%
0.020%
0.028%
0.115%
0.244%
Arithmetic
System Mean
using 0
0.019%
0.028%
0.106%
0.195%
0.023%
0.023%
0.070%
0.117%
0.020%
0.028%
0.103%
0.188%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Table B1. Benzene - Summary of the Stage 2 Analyses
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 5 Hg/L
> 2.5 ng/L
> 1 Mi/L.
>0.5ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L.
>0.5ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L
>0.5ng/L
Total Pop Served
by Systems
86,395,538
86,395,538
86,395,538
86,395,538
140,551,755
140,551,755
140,551,755
140,551,755
226,947,293
226,947,293
226,947,293
226,947,293
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
14,152
110,807
169,570
1,364,591
50
50
10,625
7,318,292
14,202
110,857
180,195
8,682,883
Arithmetic
System Mean
using 1/2 MRL
14,152
109,663
148,699
398,783
50
50
10,625
86,052
14,202
109,713
159,324
484,835
Arithmetic
System Mean
using 0
14,152
109,663
147,729
282,886
50
50
10,625
21,533
14,202
109,713
158,354
304,419
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.016%
0.128%
0.196%
1.579%
0.00004%
0.00004%
0.008%
5.207%
0.006%
0.049%
0.079%
3.826%
Arithmetic
System Mean
using 1/2 MRL
0.016%
0.127%
0.172%
0.462%
0.00004%
0.00004%
0.008%
0.061%
0.006%
0.048%
0.070%
0.214%
Arithmetic
System Mean
using 0
0.016%
0.127%
0.171%
0.327%
0.00004%
0.00004%
0.008%
0.015%
0.006%
0.048%
0.070%
0.134%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Table B2. Carbofuran - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source
Water
Type
Ground
Water
Surface
Water
Combined
Ground &
Surface
Water
Threshold
> 40 ng/L
> 20 ng/L
> 7 ng/L
>0.9ng/L
> 40 ng/L
> 20 ng/L
> 7 ng/L
>0.9ng/L
> 40 ng/L
> 20 ng/L
> 7 ng/L
>0.9ng/L
Total #
Systems
28,289
28,289
28,289
28,289
2,808
2,808
2,808
2,808
31,097
31,097
31,097
31,097
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
0
0
30
0
0
1
25
0
0
1
55
Arithmetic
System Mean
using 1/2 MRL
0
0
0
1
0
0
1
1
0
0
1
2
Arithmetic
System Mean
using 0
0
0
0
0
0
0
1
1
0
0
1
1
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.000%
0.000%
0.106%
0.000%
0.000%
0.036%
0.890%
0.000%
0.000%
0.003%
0.177%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.000%
0.000%
0.004%
0.000%
0.000%
0.036%
0.036%
0.000%
0.000%
0.003%
0.006%
Arithmetic
System Mean
using 0
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.036%
0.036%
0.000%
0.000%
0.003%
0.003%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Table B2. Carbofuran - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source
Water
Type
Ground
Water
Surface
Water
Combined
Ground &
Surface
Water
Threshold
> 40 |jg/L
> 20 ug/L
> 7 ng/L
>0.9ng/L
> 40 |jg/L
> 20 |jg/L
> 7 ng/L
>0.9ng/L
> 40 |jg/L
> 20 |jg/L
> 7 ng/L
>0.9ng/L
Total Pop Served
by Systems
61,793,025
61,793,025
61,793,025
61,793,025
106,180,317
106,180,317
106,180,317
106,180,317
167,973,342
167,973,342
167,973,342
167,973,342
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
0
0
1,138,494
0
0
3,186
7,701,631
0
0
3,186
8,840,125
Arithmetic
System Mean
using 1/2 MRL
0
0
0
220
0
0
3,186
3,186
0
0
3,186
3,406
Arithmetic
System Mean
using 0
0
0
0
0
0
0
3,186
3,186
0
0
3,186
3,186
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.000%
0.000%
1.842%
0.000%
0.000%
0.003%
7.253%
0.000%
0.000%
0.002%
5.263%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.000%
0.000%
0.0004%
0.000%
0.000%
0.003%
0.003%
0.000%
0.000%
0.002%
0.002%
Arithmetic
System Mean
using 0
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.003%
0.003%
0.000%
0.000%
0.002%
0.002%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B3. Carbon tetrachloride - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 5 Hg/L
> 2.5 ng/L
> 1 Mi/L.
> 0.5 ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L.
> 0.5 ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L
> 0.5 ng/L
Total #
Systems
46,190
46,190
46,190
46,190
4,256
4,256
4,256
4,256
50,446
50,446
50,446
50,446
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
5
13
54
293
0
0
5
133
5
13
59
426
Arithmetic
System Mean
using 1/2 MRL
5
12
46
101
0
0
4
17
5
12
50
118
Arithmetic
System Mean
using 0
5
12
36
76
0
0
4
8
5
12
40
84
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.011%
0.028%
0.117%
0.634%
0.000%
0.000%
0.117%
3.125%
0.010%
0.026%
0.117%
0.844%
Arithmetic
System Mean
using 1/2 MRL
0.011%
0.026%
0.100%
0.219%
0.000%
0.000%
0.094%
0.399%
0.010%
0.024%
0.099%
0.234%
Arithmetic
System Mean
using 0
0.011%
0.026%
0.078%
0.165%
0.000%
0.000%
0.094%
0.188%
0.010%
0.024%
0.079%
0.167%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B3. Carbon tetrachloride
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 5 Hg/L
> 2.5 ng/L
> 1 Mi/L.
>0.5ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mi/L
>0.5ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L
>0.5ng/L
Total Pop Served
by Systems
86,397,574
86,397,574
86,397,574
86,397,574
140,537,213
140,537,213
140,537,213
140,537,213
226,934,787
226,934,787
226,934,787
226,934,787
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
1,746
5,808
60,156
1,638,978
0
0
204,708
9,450,131
1,746
5,808
264,864
11,089,109
Arithmetic
System Mean
using 1/2 MRL
1,746
5,508
58,138
159,018
0
0
153,958
590,725
1,746
5,508
212,096
749,743
Arithmetic
System Mean
using 0
1,746
5,508
35,883
131,766
0
0
153,958
236,026
1,746
5,508
189,841
367,792
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.002%
0.007%
0.070%
1.897%
0.000%
0.000%
0.146%
6.724%
0.001%
0.003%
0.117%
4.886%
Arithmetic
System Mean
using 1/2 MRL
0.002%
0.006%
0.067%
0.184%
0.000%
0.000%
0.110%
0.420%
0.001%
0.002%
0.093%
0.330%
Arithmetic
System Mean
using 0
0.002%
0.006%
0.042%
0.153%
0.000%
0.000%
0.110%
0.168%
0.001%
0.002%
0.084%
0.162%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Table B4. Chlordane - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 2 Mg/L
> 1 Mg/L
> 2 Mg/L
> 1 Mg/L
> 2 Mg/L
> 1 Mg/L
Total #
Systems
28,808
28,808
3,033
3,033
31,841
31,841
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
1
2
0
0
1
2
Arithmetic
System Mean
using 1/2 MRL
1
2
0
0
1
2
Arithmetic
System Mean
using 0
1
1
0
0
1
1
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.003%
0.007%
0.000%
0.000%
0.003%
0.006%
Arithmetic
System Mean
using 1/2 MRL
0.003%
0.007%
0.000%
0.000%
0.003%
0.006%
Arithmetic
System Mean
using 0
0.003%
0.003%
0.000%
0.000%
0.003%
0.003%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Table B4. Chlordane - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
>2Mg/L
>IMS/L
>2Mg/L
>IMS/L
>2Mg/L
>IMS/L
Total Pop Served
by Systems
66,936,780
66,936,780
115,100,195
115,100,195
182,036,975
182,036,975
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
80
116
0
0
80
116
Arithmetic
System Mean
using 1/2 MRL
80
116
0
0
80
116
Arithmetic
System Mean
using 0
80
80
0
0
80
80
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.0001%
0.0002%
0.000%
0.000%
0.00004%
0.0001%
Arithmetic
System Mean
using 1/2 MRL
0.0001%
0.0002%
0.000%
0.000%
0.00004%
0.0001%
Arithmetic
System Mean
using 0
0.0001%
0.0001%
0.000%
0.000%
0.00004%
0.0000%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B5. 1 ,2-Dibromo-3-chloropropane (DBCP) - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined Ground
& Surface Water
Threshold
> 0.2 ng/L
>0.1ng/L
> 0.2 ng/L
>0.1ng/L
> 0.2 ng/L
>0.1ng/L
Total #
Systems
34,602
34,602
3,016
3,016
37,618
37,618
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
38
85
4
12
42
97
Arithmetic
System Mean
using 1/2 MRL
38
82
4
11
42
93
Arithmetic
System Mean
using 0
38
81
4
11
42
92
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.110%
0.246%
0.133%
0.398%
0.112%
0.258%
Arithmetic
System Mean
using 1/2 MRL
0.110%
0.237%
0.133%
0.365%
0.112%
0.247%
Arithmetic
System Mean
using 0
0.110%
0.234%
0.133%
0.365%
0.112%
0.245%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B5. 1,2-Dibromo-3-chloropropane
Source Water
Type
Ground Water
Surface Water
Combined Ground
& Surface Water
Threshold
>0.2|jg/L
>0.1|jg/L
>0.2|jg/L
>0.1|jg/L
>0.2|jg/L
>0.1|jg/L
Total Pop Served
by Systems
73,552,992
73,552,992
120,196,347
120,196,347
193,749,339
193,749,339
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
15,947
391,923
9,246
990,387
25,193
1,382,310
Arithmetic
System Mean
using 1/2 MRL
15,947
385,285
9,246
986,013
25,193
1,371,298
Arithmetic
System Mean
using 0
15,947
195,179
9,246
986,013
25,193
1,181,192
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.022%
0.533%
0.008%
0.824%
0.013%
0.713%
Arithmetic
System Mean
using 1/2 MRL
0.022%
0.524%
0.008%
0.820%
0.013%
0.708%
Arithmetic
System Mean
using 0
0.022%
0.265%
0.008%
0.820%
0.013%
0.610%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B6. 1,2-Dichloroethane - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 5 Hg/L
> 2.5 ng/L
> 1 Mi/L.
> 0.5 ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L.
> 0.5 ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L
> 0.5 ng/L
Total #
Systems
46,185
46,185
46,185
46,185
4,257
4,257
4,257
4,257
50,442
50,442
50,442
50,442
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
3
9
43
190
0
0
3
38
3
9
46
228
Arithmetic
System Mean
using 1/2 MRL
3
9
35
77
0
0
2
5
3
9
37
82
Arithmetic
System Mean
using 0
3
8
29
60
0
0
1
3
3
8
30
63
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.006%
0.019%
0.093%
0.411%
0.000%
0.000%
0.070%
0.893%
0.006%
0.018%
0.091%
0.452%
Arithmetic
System Mean
using 1/2 MRL
0.006%
0.019%
0.076%
0.167%
0.000%
0.000%
0.047%
0.117%
0.006%
0.018%
0.073%
0.163%
Arithmetic
System Mean
using 0
0.006%
0.017%
0.063%
0.130%
0.000%
0.000%
0.023%
0.070%
0.006%
0.016%
0.059%
0.125%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B6. 1,2-Dichloroethane - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 5 Hg/L
> 2.5 ng/L
> 1 Mi/L.
>0.5ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L.
>0.5ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L
>0.5ng/L
Total Pop Served
by Systems
86,392,793
86,392,793
86,392,793
86,392,793
140,541,198
140,541,198
140,541,198
140,541,198
226,933,991
226,933,991
226,933,991
226,933,991
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
151
873
99,274
963,134
0
0
90,390
7,359,474
151
873
189,664
8,322,608
Arithmetic
System Mean
using 1/2 MRL
151
873
90,942
135,637
0
0
54,260
141,310
151
873
145,202
276,947
Arithmetic
System Mean
using 0
151
833
82,396
119,232
0
0
4,750
90,390
151
833
87,146
209,622
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.0002%
0.001%
0.115%
1.115%
0.000%
0.000%
0.064%
5.237%
0.0001%
0.0004%
0.084%
3.667%
Arithmetic
System Mean
using 1/2 MRL
0.0002%
0.001%
0.105%
0.157%
0.000%
0.000%
0.039%
0.101%
0.0001%
0.0004%
0.064%
0.122%
Arithmetic
System Mean
using 0
0.0002%
0.001%
0.095%
0.138%
0.000%
0.000%
0.003%
0.064%
0.0001%
0.0004%
0.038%
0.092%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B7. Dichloromethane (Methylene dichloride) - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source
Water
Type
Ground
Water
Surface
Water
Combined
Ground &
Surface
Water
Threshold
> 5 Mg/L
> 2.5 Mg/L
> 1 Mg/L
> 0.5 Mg/L
> 5 Mg/L
> 2.5 Mg/L
> 1 Mg/L
> 0.5 Mg/L
> 5 Mg/L
> 2.5 Mg/L
> 1 Mg/L
> 0.5 ng/L
Total # Systems
45,918
45,918
45,918
45,918
4,251
4,251
4,251
4,251
50,169
50,169
50,169
50,169
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
16
48
240
1,251
1
5
36
306
17
53
276
1,557
Arithmetic
System Mean
using 1/2 MRL
15
46
181
494
1
5
27
85
16
51
208
579
Arithmetic
System Mean
using 0
12
42
151
329
1
4
18
54
13
46
169
383
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.035%
0.105%
0.523%
2.724%
0.024%
0.118%
0.847%
7.198%
0.034%
0.106%
0.550%
3.104%
Arithmetic
System Mean
using 1/2 MRL
0.033%
0.100%
0.394%
1.076%
0.024%
0.118%
0.635%
2.000%
0.032%
0.102%
0.415%
1.154%
Arithmetic
System Mean
using 0
0.026%
0.091%
0.329%
0.716%
0.024%
0.094%
0.423%
1.270%
0.026%
0.092%
0.337%
0.763%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B7. Dichloromethane
Source
Water
Type
Ground
Water
Surface
Water
Combined
Ground &
Surface
Water
Threshold
>5Mg/L
> 2.5 ng/L
>lMS/L
> 0.5 ng/L
>5Mg/L
> 2.5 ng/L
>lMS/L
> 0.5 ng/L
>5Mg/L
> 2.5 ng/L
>lMS/L
> 0.5 ng/L
Total Pop Served
by Systems
86,307,048
86,307,048
86,307,048
86,307,048
140,537,012
140,537,012
140,537,012
140,537,012
226,844,060
226,844,060
226,844,060
226,844,060
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
10,219
36,518
1,273,387
6,645,442
1,800
7,435
243,772
25,125,784
12,019
43,953
1,517,159
31,771,226
Arithmetic
System Mean
using 1/2 MRL
10,119
33,009
1,152,919
1,910,810
1,800
7,435
232,890
1,586,371
11,919
40,444
1,385,809
3,497,181
Arithmetic
System Mean
using 0
9,148
31,607
791,105
1,385,316
1,800
7,350
154,950
458,789
10,948
38,957
946,055
1,844,105
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.012%
0.042%
1.475%
7.700%
0.001%
0.005%
0.173%
17.878%
0.005%
0.019%
0.669%
14.006%
Arithmetic
System Mean
using 1/2 MRL
0.012%
0.038%
1.336%
2.214%
0.001%
0.005%
0.166%
1.129%
0.005%
0.018%
0.611%
1.542%
Arithmetic
System Mean
using 0
0.011%
0.037%
0.917%
1.605%
0.001%
0.005%
0.110%
0.326%
0.005%
0.017%
0.417%
0.813%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B8. 2,4-Dichlorophenoxyacetic Acid (2,4-D) - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water Type
Ground Water
Surface Water
Combined Ground
& Surface Water
Threshold
> 70 ng/L
> 40 ng/L
> 35 ng/L
> 70 ng/L
> 40 ng/L
> 35 ng/L
> 70 ng/L
> 40 ng/L
> 35 ng/L
Total #
Systems
30,172
30,172
30,172
3,015
3,015
3,015
33,187
33,187
33,187
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
0
0
0
0
0
0
0
0
Arithmetic
System Mean
using 1/2 MRL
0
0
0
0
0
0
0
0
0
Arithmetic
System Mean
using 0
0
0
0
0
0
0
0
0
0
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Arithmetic
System Mean
using 0
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B8. 2,4-Dichlorophenoxyacetic Acid
Source Water Type
Ground Water
Surface Water
Combined Ground
& Surface Water
Threshold
> 70 ng/L
> 40 ng/L
> 35 ng/L
> 70 ng/L
> 40 ng/L
> 35 ng/L
> 70 ng/L
> 40 ng/L
> 35 ng/L
Total Pop Served
by Systems
67,200,878
67,200,878
67,200,878
120,250,305
120,250,305
120,250,305
187,451,183
187,451,183
187,451,183
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
0
0
0
0
0
0
0
0
Arithmetic
System Mean
using 1/2 MRL
0
0
0
0
0
0
0
0
0
Arithmetic
System Mean
using 0
0
0
0
0
0
0
0
0
0
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.0000%
0.000%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.0000%
0.000%
Arithmetic
System Mean
using 0
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.0000%
0.000%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B9. 1,2-Dichloropropane - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 5 Hg/L
> 2.5 ng/L
> 1 Mi/L.
> 0.5 ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L.
> 0.5 ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L
> 0.5 ng/L
Total #
Systems
46,180
46,180
46,180
46,180
4,257
4,257
4,257
4,257
50,437
50,437
50,437
50,437
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
2
26
138
0
0
1
14
0
2
27
152
Arithmetic
System Mean
using 1/2 MRL
0
2
23
59
0
0
1
2
0
2
24
61
Arithmetic
System Mean
using 0
0
2
20
46
0
0
1
1
0
2
21
47
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.004%
0.056%
0.299%
0.000%
0.000%
0.023%
0.329%
0.000%
0.004%
0.054%
0.301%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.004%
0.050%
0.128%
0.000%
0.000%
0.023%
0.047%
0.000%
0.004%
0.048%
0.121%
Arithmetic
System Mean
using 0
0.000%
0.004%
0.043%
0.100%
0.000%
0.000%
0.023%
0.023%
0.000%
0.004%
0.042%
0.093%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B9. 1,2-Dichloropropane - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 5 Hg/L
> 2.5 ng/L
> 1 Mi/L.
>0.5ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L.
>0.5ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L
>0.5ng/L
Total Pop Served
by Systems
86,395,709
86,395,709
86,395,709
86,395,709
140,516,425
140,516,425
140,516,425
140,516,425
226,912,134
226,912,134
226,912,134
226,912,134
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
120
20,445
647,056
0
0
265,696
7,377,671
0
120
286,141
8,024,727
Arithmetic
System Mean
using 1/2 MRL
0
120
20,057
86,764
0
0
265,696
407,696
0
120
285,753
494,460
Arithmetic
System Mean
using 0
0
120
18,656
30,337
0
0
265,696
265,696
0
120
284,352
296,033
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.0001%
0.024%
0.749%
0.000%
0.000%
0.189%
5.250%
0.000%
0.0001%
0.126%
3.536%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.0001%
0.023%
0.100%
0.000%
0.000%
0.189%
0.290%
0.000%
0.0001%
0.126%
0.218%
Arithmetic
System Mean
using 0
0.000%
0.0001%
0.022%
0.035%
0.000%
0.000%
0.189%
0.189%
0.000%
0.0001%
0.125%
0.130%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Table B10. Endothall - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 100 ng/L
> 50 ng/L
> 100 ng/L
> 50 ng/L
> 100 ng/L
> 50 ng/L
Total #
Systems
12,632
12,632
1,524
1,524
14,156
14,156
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
0
0
1
0
1
Arithmetic
System Mean
using 1/2 MRL
0
0
0
1
0
1
Arithmetic
System Mean
using 0
0
0
0
1
0
1
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.000%
0.000%
0.066%
0.000%
0.007%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.000%
0.000%
0.066%
0.000%
0.007%
Arithmetic
System Mean
using 0
0.000%
0.000%
0.000%
0.066%
0.000%
0.007%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Table B10. Endothall - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 100 ug/L
> 50 ng/L
> 100 ug/L
> 50 ug/L
> 100 ug/L
> 50 ug/L
Total Pop Served
by Systems
44,124,258
44,124,258
74,412,543
74,412,543
118,536,801
118,536,801
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
0
0
10,000
0
10,000
Arithmetic
System Mean
using 1/2 MRL
0
0
0
10,000
0
10,000
Arithmetic
System Mean
using 0
0
0
0
10,000
0
10,000
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.000%
0.000%
0.013%
0.000%
0.008%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.000%
0.000%
0.013%
0.000%
0.008%
Arithmetic
System Mean
using 0
0.000%
0.000%
0.000%
0.013%
0.000%
0.008%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Table B11. Heptachlor - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 0.4 ng/L
> 0.2 ng/L
>0.1ng/L
> 0.4 ng/L
> 0.2 ng/L
>0.1ng/L
> 0.4 ng/L
> 0.2 ng/L
>0.1ng/L
Total #
Systems
29,965
29,965
29,965
3,055
3,055
3,055
33,020
33,020
33,020
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
1
1
41
0
0
1
1
1
42
Arithmetic
System Mean
using 1/2 MRL
1
1
41
0
0
1
1
1
42
Arithmetic
System Mean
using 0
1
1
41
0
0
1
1
1
42
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.003%
0.003%
0.137%
0.000%
0.000%
0.033%
0.003%
0.003%
0.127%
Arithmetic
System Mean
using 1/2 MRL
0.003%
0.003%
0.137%
0.000%
0.000%
0.033%
0.003%
0.003%
0.127%
Arithmetic
System Mean
using 0
0.003%
0.003%
0.137%
0.000%
0.000%
0.033%
0.003%
0.003%
0.127%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Table B11. Heptachlor - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 0.4 |jg/L
> 0.2 ug/L
> 0.1 ug/L
> 0.4 |jg/L
> 0.2 ug/L
> 0.1 ug/L
> 0.4 |jg/L
> 0.2 ug/L
> 0.1 ug/L
Total Pop Served
by Systems
67,922,151
67,922,151
67,922,151
116,521,633
116,521,633
116,521,633
184,443,784
184,443,784
184,443,784
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
325
325
23,112
0
0
8,380
325
325
31,492
Arithmetic
System Mean
using 1/2 MRL
325
325
23,112
0
0
8,380
325
325
31,492
Arithmetic
System Mean
using 0
325
325
23,112
0
0
8,380
325
325
31,492
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.0005%
0.0005%
0.034%
0.000%
0.000%
0.007%
0.0002%
0.0002%
0.017%
Arithmetic
System Mean
using 1/2 MRL
0.0005%
0.0005%
0.034%
0.000%
0.000%
0.007%
0.0002%
0.0002%
0.017%
Arithmetic
System Mean
using 0
0.0005%
0.0005%
0.034%
0.000%
0.000%
0.007%
0.0002%
0.0002%
0.017%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B12. Heptachlor Epoxide - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 0.2 ng/L
>0.1ng/L
> 0.2 ng/L
>0.1ng/L
> 0.2 ng/L
>0.1ng/L
Total #
Systems
29,961
29,961
3,054
3,054
33,015
33,015
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
1
3
0
0
1
3
Arithmetic
System Mean
using 1/2 MRL
1
3
0
0
1
3
Arithmetic
System Mean
using 0
1
3
0
0
1
3
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.003%
0.010%
0.000%
0.000%
0.003%
0.009%
Arithmetic
System Mean
using 1/2 MRL
0.003%
0.010%
0.000%
0.000%
0.003%
0.009%
Arithmetic
System Mean
using 0
0.003%
0.010%
0.000%
0.000%
0.003%
0.009%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B12. Heptachlor Epoxide - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
>0.2|jg/L
>0.1ug/L
>0.2|jg/L
>0.1ug/L
>0.2|jg/L
>0.1|jg/L
Total Pop Served
by Systems
67,983,066
67,983,066
116,494,709
116,494,709
184,477,775
184,477,775
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
325
14,419
0
0
325
14,419
Arithmetic
System Mean
using 1/2 MRL
325
14,419
0
0
325
14,419
Arithmetic
System Mean
using 0
325
14,419
0
0
325
14,419
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.0005%
0.021%
0.000%
0.000%
0.0002%
0.008%
Arithmetic
System Mean
using 1/2 MRL
0.0005%
0.021%
0.000%
0.000%
0.0002%
0.008%
Arithmetic
System Mean
using 0
0.0005%
0.021%
0.000%
0.000%
0.0002%
0.008%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review Revised September 2010
Table B13. Hexachlorobenzene - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 1 M§/L
> 0.5 Mg/L
> 0.1 Mg/L
> 1 Mg/L
> 0.5 Mg/L
> 0.1 Mg/L
> 1 Mg/L
> 0.5 ng/L
> 0.1 Mg/L
Total #
Systems
29,793
29,793
29,793
3,033
3,033
3,033
32,826
32,826
32,826
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
3
3
20
0
1
39
3
4
59
Arithmetic
System Mean
using 1/2 MRL
3
3
8
0
1
8
3
4
16
Arithmetic
System Mean
using 0
3
3
8
0
1
1
3
4
9
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.010%
0.010%
0.067%
0.000%
0.033%
1.286%
0.009%
0.012%
0.180%
Arithmetic
System Mean
using 1/2 MRL
0.010%
0.010%
0.027%
0.000%
0.033%
0.264%
0.009%
0.012%
0.049%
Arithmetic
System Mean
using 0
0.010%
0.010%
0.027%
0.000%
0.033%
0.033%
0.009%
0.012%
0.027%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review Revised September 2010
Table B13. Hexachlorobenzene - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
>IMS/L
> 0.5 ng/L
>0.1ng/L
>lMS/L
> 0.5 ng/L
>0.1ng/L
>lMS/L
> 0.5 ng/L
>0.1ng/L
Total Pop Served
by Systems
67,957,193
67,957,193
67,957,193
116,167,630
116,167,630
116,167,630
184,124,823
184,124,823
184,124,823
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
2,273
2,273
639,313
0
2,671
2,485,099
2,273
4,944
3,124,412
Arithmetic
System Mean
using 1/2 MRL
2,273
2,273
6,741
0
2,671
87,448
2,273
4,944
94,189
Arithmetic
System Mean
using 0
2,273
2,273
6,741
0
2,671
2,671
2,273
4,944
9,412
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.003%
0.003%
0.941%
0.000%
0.002%
2.139%
0.001%
0.003%
1.697%
Arithmetic
System Mean
using 1/2 MRL
0.003%
0.003%
0.010%
0.000%
0.002%
0.075%
0.001%
0.003%
0.051%
Arithmetic
System Mean
using 0
0.003%
0.003%
0.010%
0.000%
0.002%
0.002%
0.001%
0.003%
0.005%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review Revised September 2010
Table B14. Hexachlorocyclopentadiene - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 50 ng/L
> 40 ng/L
> 25 ng/L
> 50 ng/L
> 40 ng/L
> 25 ng/L
> 50 ng/L
> 40 ng/L
> 25 ng/L
Total #
Systems
29,767
29,767
29,767
3,034
3,034
3,034
32,801
32,801
32,801
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
0
0
0
0
0
0
0
0
Arithmetic
System Mean
using 1/2 MRL
0
0
0
0
0
0
0
0
0
Arithmetic
System Mean
using 0
0
0
0
0
0
0
0
0
0
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Arithmetic
System Mean
using 0
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review Revised September 2010
Table B14. Hexachlorocyclopentadiene - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 50 ng/L
> 40 ng/L
> 25 ng/L
> 50 ng/L
> 40 ng/L
> 25 ng/L
> 50 ng/L
> 40 ng/L
> 25 ng/L
Total Pop Served
by Systems
67,981,852
67,981,852
67,981,852
116,756,578
116,756,578
116,756,578
184,738,430
184,738,430
184,738,430
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
0
0
0
0
0
0
0
0
Arithmetic
System Mean
using 1/2 MRL
0
0
0
0
0
0
0
0
0
Arithmetic
System Mean
using 0
0
0
0
0
0
0
0
0
0
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Arithmetic
System Mean
using 0
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B15. Oxamyl (Vydate) - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 200 ng/L
> 100 ng/L
> 2 Hg/L
> 200 ng/L
> 100 ng/L
> 2 Hg/L
> 200 ng/L
> 100 ng/L
> 2 Hg/L
Total #
Systems
28,100
28,100
28,100
2,776
2,776
2,776
30,876
30,876
30,876
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
0
14
0
0
3
0
0
17
Arithmetic
System Mean
using 1/2 MRL
0
0
11
0
0
2
0
0
13
Arithmetic
System Mean
using 0
0
0
6
0
0
2
0
0
8
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.000%
0.050%
0.000%
0.000%
0.108%
0.000%
0.000%
0.055%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.000%
0.039%
0.000%
0.000%
0.072%
0.000%
0.000%
0.042%
Arithmetic
System Mean
using 0
0.000%
0.000%
0.021%
0.000%
0.000%
0.072%
0.000%
0.000%
0.026%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Revised September 2010
Table B15. Oxamyl (Vydate) - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 200 ug/L
> 100 ug/L
> 2 ug/L
> 200 ug/L
> 100 ug/L
> 2 ug/L
> 200 ug/L
> 100 ug/L
> 2 ug/L
Total Pop Served
by Systems
61,701,854
61,701,854
61,701,854
105,676,577
105,676,577
105,676,577
167,378,431
167,378,431
167,378,431
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
0
38,142
0
0
257,848
0
0
295,990
Arithmetic
System Mean
using 1/2 MRL
0
0
37,979
0
0
3,386
0
0
41,365
Arithmetic
System Mean
using 0
0
0
3,669
0
0
3,386
0
0
7,055
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.000%
0.062%
0.000%
0.000%
0.244%
0.000%
0.000%
0.177%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.000%
0.062%
0.000%
0.000%
0.003%
0.000%
0.000%
0.025%
Arithmetic
System Mean
using 0
0.000%
0.000%
0.006%
0.000%
0.000%
0.003%
0.000%
0.000%
0.004%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review Revised September 2010
Table B16. Tetrachloroethylene (PCE) - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 5 Hg/L
> 2.5 ng/L
> 1 Mi/L.
> 0.5 ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L.
> 0.5 ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L
> 0.5 ng/L
Total #
Systems
46,180
46,180
46,180
46,180
4,256
4,256
4,256
4,256
50,436
50,436
50,436
50,436
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
20
61
244
860
5
14
42
145
25
75
286
1,005
Arithmetic
System Mean
using 1/2 MRL
20
58
214
446
3
13
37
73
23
71
251
519
Arithmetic
System Mean
using 0
20
55
190
356
3
13
30
56
23
68
220
412
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.043%
0.132%
0.528%
1.862%
0.117%
0.329%
0.987%
3.407%
0.050%
0.149%
0.567%
1.993%
Arithmetic
System Mean
using 1/2 MRL
0.043%
0.126%
0.463%
0.966%
0.070%
0.305%
0.869%
1.715%
0.046%
0.141%
0.498%
1.029%
Arithmetic
System Mean
using 0
0.043%
0.119%
0.411%
0.771%
0.070%
0.305%
0.705%
1.316%
0.046%
0.135%
0.436%
0.817%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review Revised September 2010
Table B16. Tetrachloroethylene (PCE) - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 5 Hg/L
> 2.5 ng/L
> 1 Mi/L.
>0.5ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L.
>0.5ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L
>0.5ng/L
Total Pop Served
by Systems
86,396,173
86,396,173
86,396,173
86,396,173
140,612,382
140,612,382
140,612,382
140,612,382
227,008,555
227,008,555
227,008,555
227,008,555
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
81,488
461,738
2,498,326
11,851,080
992,445
1,244,255
8,207,545
16,303,826
1,073,933
1,705,993
10,705,871
28,154,906
Arithmetic
System Mean
using 1/2 MRL
81,488
455,716
2,122,956
4,827,257
546,718
1,236,118
8,053,939
9,744,394
628,206
1,691,834
10,176,895
14,571,651
Arithmetic
System Mean
using 0
81,488
411,244
1,933,039
3,399,163
546,718
1,236,118
7,691,532
9,009,278
628,206
1,647,362
9,624,571
12,408,441
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.094%
0.534%
2.892%
13.717%
0.706%
0.885%
5.837%
11.595%
0.473%
0.752%
4.716%
12.403%
Arithmetic
System Mean
using 1/2 MRL
0.094%
0.527%
2.457%
5.587%
0.389%
0.879%
5.728%
6.930%
0.277%
0.745%
4.483%
6.419%
Arithmetic
System Mean
using 0
0.094%
0.476%
2.237%
3.934%
0.389%
0.879%
5.470%
6.407%
0.277%
0.726%
4.240%
5.466%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Table B17. Toluene - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 1,000 ng/L
> 600 ng/L
> 500 ng/L
> 1,000 ng/L
> 600 ng/L
> 500 ng/L
> 1,000 ng/L
> 600 ng/L
> 500 ng/L
Total #
Systems
46,193
46,193
46,193
4,258
4,258
4,258
50,451
50,451
50,451
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
1
2
2
0
0
0
1
2
2
Arithmetic
System Mean
using 1/2 MRL
1
2
2
0
0
0
1
2
2
Arithmetic
System Mean
using 0
1
2
2
0
0
0
1
2
2
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.002%
0.004%
0.004%
0.000%
0.000%
0.000%
0.002%
0.004%
0.004%
Arithmetic
System Mean
using 1/2 MRL
0.002%
0.004%
0.004%
0.000%
0.000%
0.000%
0.002%
0.004%
0.004%
Arithmetic
System Mean
using 0
0.002%
0.004%
0.004%
0.000%
0.000%
0.000%
0.002%
0.004%
0.004%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Table B17. Toluene - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 1,000 |jg/L
> 600 ng/L
> 500 ng/L
> 1,000 |jg/L
> 600 ng/L
> 500 ng/L
> 1,000 |jg/L
> 600 ng/L
> 500 ng/L
Total Pop Served
by Systems
86,403,546
86,403,546
86,403,546
140,551,755
140,551,755
140,551,755
226,955,301
226,955,301
226,955,301
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
500
840
840
0
0
0
500
840
840
Arithmetic
System Mean
using 1/2 MRL
500
840
840
0
0
0
500
840
840
Arithmetic
System Mean
using 0
500
840
840
0
0
0
500
840
840
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.001%
0.001%
0.001%
0.000%
0.000%
0.000%
0.0002%
0.0004%
0.0004%
Arithmetic
System Mean
using 1/2 MRL
0.001%
0.001%
0.001%
0.000%
0.000%
0.000%
0.0002%
0.0004%
0.0004%
Arithmetic
System Mean
using 0
0.001%
0.001%
0.001%
0.000%
0.000%
0.000%
0.0002%
0.0004%
0.0004%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review Revised September 2010
Table B18. Toxaphene - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations')
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 3 Mg/L
> 1.5 Mg/L
> 1 Mg/L
> 3 Mg/L
> 1.5 Mg/L
> 1 Mg/L
> 3 Mg/L
> 1.5 Mg/L
> 1 Mg/L
Total #
Systems
27,718
27,718
27,718
2,669
2,669
2,669
30,387
30,387
30,387
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
4
5
7
0
0
2
4
5
9
Arithmetic
System Mean
using 1/2 MRL
3
5
5
0
0
0
3
5
5
Arithmetic
System Mean
using 0
3
5
5
0
0
0
3
5
5
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.014%
0.018%
0.025%
0.000%
0.000%
0.075%
0.013%
0.016%
0.030%
Arithmetic
System Mean
using 1/2 MRL
0.011%
0.018%
0.018%
0.000%
0.000%
0.000%
0.010%
0.016%
0.016%
Arithmetic
System Mean
using 0
0.011%
0.018%
0.018%
0.000%
0.000%
0.000%
0.010%
0.016%
0.016%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review Revised September 2010
Table B18. Toxaphene - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations')
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
>3MS/L
> 1.5 Hg/L
>lMS/L
>3Mg/L
> 1.5 Hg/L
>lMS/L
>3Mg/L
> 1.5 Hg/L
>lMS/L
Total Pop Served
by Systems
60,886,049
60,886,049
60,886,049
99,126,085
99,126,085
99,126,085
160,012,134
160,012,134
160,012,134
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
22,989
23,429
27,713
0
0
257,737
22,989
23,429
285,450
Arithmetic
System Mean
using 1/2 MRL
22,691
23,429
23,429
0
0
0
22,691
23,429
23,429
Arithmetic
System Mean
using 0
22,691
23,429
23,429
0
0
0
22,691
23,429
23,429
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.038%
0.038%
0.046%
0.000%
0.000%
0.260%
0.014%
0.015%
0.178%
Arithmetic
System Mean
using 1/2 MRL
0.037%
0.038%
0.038%
0.000%
0.000%
0.000%
0.014%
0.015%
0.015%
Arithmetic
System Mean
using 0
0.037%
0.038%
0.038%
0.000%
0.000%
0.000%
0.014%
0.015%
0.015%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review Revised September 2010
Table B19. 1,1,2-Trichloroethane - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 5 Hg/L
> 3 ng/L
> 2.5 ng/L
> 5 Hg/L
> 3 ng/L
> 2.5 ng/L
> 5 Hg/L
> 3 ng/L
> 2.5 ng/L
Total #
Systems
45,942
45,942
45,942
4,253
4,253
4,253
50,195
50,195
50,195
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
1
1
0
0
0
0
1
1
Arithmetic
System Mean
using 1/2 MRL
0
1
1
0
0
0
0
1
1
Arithmetic
System Mean
using 0
0
1
1
0
0
0
0
1
1
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.002%
0.002%
0.000%
0.000%
0.000%
0.000%
0.002%
0.002%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.002%
0.002%
0.000%
0.000%
0.000%
0.000%
0.002%
0.002%
Arithmetic
System Mean
using 0
0.000%
0.002%
0.002%
0.000%
0.000%
0.000%
0.000%
0.002%
0.002%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review Revised September 2010
Table B19. 1,1,2-Trichloroethane - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
>5MS/L
>3Mg/L
> 2.5 ng/L
>5Mg/L
>3Mg/L
> 2.5 ng/L
>5MS/L
>3Mg/L
> 2.5 ng/L
Total Pop Served
by Systems
86,314,890
86,314,890
86,314,890
140,536,579
140,536,579
140,536,579
226,851,469
226,851,469
226,851,469
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
700
700
0
0
0
0
700
700
Arithmetic
System Mean
using 1/2 MRL
0
700
700
0
0
0
0
700
700
Arithmetic
System Mean
using 0
0
700
700
0
0
0
0
700
700
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.001%
0.001%
0.000%
0.000%
0.000%
0.000%
0.0003%
0.0003%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.001%
0.001%
0.000%
0.000%
0.000%
0.000%
0.0003%
0.0003%
Arithmetic
System Mean
using 0
0.000%
0.001%
0.001%
0.000%
0.000%
0.000%
0.000%
0.0003%
0.0003%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review Revised September 2010
Table B20. Trichloroethylene (TCE) - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 5 Hg/L
> 2.5 ng/L
> 1 Mi/L.
> 0.5 ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L.
> 0.5 ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L
> 0.5 ng/L
Total #
Systems
46,177
46,177
46,177
46,177
4,255
4,255
4,255
4,255
50,432
50,432
50,432
50,432
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
18
60
209
624
7
10
31
115
25
70
240
739
Arithmetic
System Mean
using 1/2 MRL
18
58
181
334
7
10
27
54
25
68
208
388
Arithmetic
System Mean
using 0
18
54
160
267
7
10
22
43
25
64
182
310
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.039%
0.130%
0.453%
1.351%
0.165%
0.235%
0.729%
2.703%
0.050%
0.139%
0.476%
1.465%
Arithmetic
System Mean
using 1/2 MRL
0.039%
0.126%
0.392%
0.723%
0.165%
0.235%
0.635%
1.269%
0.050%
0.135%
0.412%
0.769%
Arithmetic
System Mean
using 0
0.039%
0.117%
0.346%
0.578%
0.165%
0.235%
0.517%
1.011%
0.050%
0.127%
0.361%
0.615%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review Revised September 2010
Table B20. Trichloroethylene (TCE) - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 5 Hg/L
> 2.5 ng/L
> 1 Mi/L.
>0.5ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L.
>0.5ng/L
> 5 Hg/L
> 2.5 ng/L
> 1 Mg/L
>0.5ng/L
Total Pop Served
by Systems
86,393,209
86,393,209
86,393,209
86,393,209
140,514,477
140,514,477
140,514,477
140,514,477
226,907,686
226,907,686
226,907,686
226,907,686
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
50,410
307,930
1,911,987
8,000,226
359,713
4,456,573
8,458,791
16,251,310
410,123
4,764,503
10,370,778
24,251,536
Arithmetic
System Mean
using 1/2 MRL
50,410
234,229
1,686,897
2,929,896
359,713
4,456,573
6,594,945
9,936,227
410,123
4,690,802
8,281,842
12,866,123
Arithmetic
System Mean
using 0
50,410
140,973
1,347,211
2,411,718
359,713
4,456,573
6,051,956
9,472,157
410,123
4,597,546
7,399,167
11,883,875
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.058%
0.356%
2.213%
9.260%
0.256%
3.172%
6.020%
11.566%
0.181%
2.100%
4.570%
10.688%
Arithmetic
System Mean
using 1/2 MRL
0.058%
0.271%
1.953%
3.391%
0.256%
3.172%
4.693%
7.071%
0.181%
2.067%
3.650%
5.670%
Arithmetic
System Mean
using 0
0.058%
0.163%
1.559%
2.792%
0.256%
3.172%
4.307%
6.741%
0.181%
2.026%
3.261%
5.237%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review Revised Sep
Table B21 . Vinyl Chloride - Summary of the Stage 1 Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 2 Mg/L
> 1 Mg/L
> 0.5 Mg/L
> 2 Mg/L
> 1 Mg/L
> 0.5 Mg/L
> 2 Mg/L
> 1 Mg/L
> 0.5 ng/L
Total #
Systems
46,158
46,158
46,158
4,253
4,253
4,253
50,411
50,411
50,411
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
10
20
104
1
1
32
11
21
136
Arithmetic
System Mean
using 1/2 MRL
9
17
41
1
1
8
10
18
49
Arithmetic
System Mean
using 0
7
14
28
1
1
4
8
15
32
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.022%
0.043%
0.225%
0.024%
0.024%
0.752%
0.022%
0.042%
0.270%
Arithmetic
System Mean
using 1/2 MRL
0.019%
0.037%
0.089%
0.024%
0.024%
0.188%
0.020%
0.036%
0.097%
Arithmetic
System Mean
using 0
0.015%
0.030%
0.061%
0.024%
0.024%
0.094%
0.016%
0.030%
0.063%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Table B21. Vinyl Chloride - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
>2Mg/L
>IMS/L
> 0.5 ng/L
>2Mg/L
>lMS/L
> 0.5 ng/L
>2Mg/L
>lMS/L
> 0.5 ng/L
Total Pop Served
by Systems
86,057,502
86,057,502
86,057,502
140,406,921
140,406,921
140,406,921
226,464,423
226,464,423
226,464,423
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
12,478
54,796
712,162
1,365
1,365
1,363,671
13,843
56,161
2,075,833
Arithmetic
System Mean
using 1/2 MRL
10,793
21,736
338,964
1,365
1,365
426,745
12,158
23,101
765,709
Arithmetic
System Mean
using 0
4,688
16,526
71,559
1,365
1,365
411,827
6,053
17,891
483,386
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.014%
0.064%
0.828%
0.001%
0.001%
0.971%
0.006%
0.025%
0.917%
Arithmetic
System Mean
using 1/2 MRL
0.013%
0.025%
0.394%
0.001%
0.001%
0.304%
0.005%
0.010%
0.338%
Arithmetic
System Mean
using 0
0.005%
0.019%
0.083%
0.001%
0.001%
0.293%
0.003%
0.008%
0.213%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Table B22. Xylenes (Total) - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 10,000 ng/L
> 5,000 ng/L
> 1,000 ng/L
> 10,000 ng/L
> 5,000 ng/L
> 1,000 ng/L
> 10,000 ng/L
> 5,000 ng/L
> 1,000 ng/L
Total #
Systems
43,726
43,726
43,726
3,972
3,972
3,972
47,698
47,698
47,698
# Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
0
0
0
0
0
0
0
0
Arithmetic
System Mean
using 1/2 MRL
0
0
0
0
0
0
0
0
0
Arithmetic
System Mean
using 0
0
0
0
0
0
0
0
0
0
% Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Arithmetic
System Mean
using 0
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
-------
Appendix B - Analysis of Occ. Data from the 2nd Six-Year Review
Table B22. Xylenes (Total) - Summary of the Stage 1 (Peak) Analyses (Single detections > threshold of interest are not necessarily MCL violations)
Revised September 2010
Source Water
Type
Ground Water
Surface Water
Combined
Ground &
Surface Water
Threshold
> 10,000 ng/L
> 5,000 |jg/L
> 1,000 |jg/L
> 10,000 ng/L
> 5,000 |jg/L
> 1,000 |jg/L
> 10,000 ng/L
> 5,000 |jg/L
> 1,000 |jg/L
Total Pop Served
by Systems
83,748,512
83,748,512
83,748,512
134,323,023
134,323,023
134,323,023
218,071,535
218,071,535
218,071,535
# Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0
0
0
0
0
0
0
0
0
Arithmetic
System Mean
using 1/2 MRL
0
0
0
0
0
0
0
0
0
Arithmetic
System Mean
using 0
0
0
0
0
0
0
0
0
0
% Pop. Served by Systems Exceeding Threshold
Arithmetic
System Mean
using MRL
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Arithmetic
System Mean
using 1/2 MRL
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
Arithmetic
System Mean
using 0
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
0.000%
------- |