United States        Office of Water       EPA 81 5-P-00-001
Environmental Protection Agency 4606           May 2001
Occurrence of Unregulated
Contaminants in Public Water
Systems: An Initial
Assessment
                         r?% Printed on Recycled Paper

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              EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
                                     CONTENTS



TABLES AND FIGURES  	v

ACRONYMS  	 xi

EXECUTIVE SUMMARY	xiii

ACKNOWLEDGMENTS  	xv

DISCLAIMER	  xvi

I.      INTRODUCTION	1
       LA.   Background	1
       I.E.   Unregulated and Regulated Contaminants, Databases, and Monitoring Timeframe	2
       I.C.   Data Analysis	7

II.     DATA SOURCES AND DATA QUALITY REVIEW	8
       II. A.   URCIS (Round 1) Data	8
             II.A.1.  Description of Data	8
             II.A.2.  Data Management and Data Quality  	9
             II.A.3.  Further Data Review and Editing	11
       II.B.   SDWIS/FED (Round 2) Data 	13
             II.B.l.  Description of Data	14
             II.B.2.  Data Management and Data Quality  	14
             II.B.3.  Further Data Review and Editing	15

III.     DEVELOPING A NATIONALLY REPRESENTATIVE PERSPECTIVE	18
       III.A.  Methods	19
             III.A.1. Manufacturing Indicators	19
             III.A.2. Agricultural Indicators	20
       III.B.  Representative Cross-Section of States  	21
             III.B.l. Incremental National Cross-Sections	25
             III.B.2. SDWIS/FED 20-State Cross-Section  	29

IV     DATA COVERAGE FOR THE NATIONAL OCCURRENCE OF CONTAMINANTS
       IN  DRINKING WATER	33
       IVA.  URCIS (Round 1) Data Coverage	33
       IVB.  SDWIS/FED (Round 2) Data Coverage	40
       IV C.  Comparison of Data Coverage of URCIS (Round 1) and SDWIS/FED (Round 2)  ... 46
       IVD.  Comparison of Data Coverage Across Systems Types and Sizes	49

V     ANALYSIS OF NATIONAL OCCURRENCE	50
       V.A.   URCIS (Round 1) Contaminant Occurrence	51
       V.B.   SDWIS/FED (Round 2) Contaminant Occurrence 	54

VI.     ASSESSMENTS OF SELECT HIGH OCCURRENCE CONTAMINANTS	56
       VI. A.  Selecting High Occurrence Contaminants for Further Analysis  	56
       VLB.  Graphical and Spatial Assessments of Select High Occurrence Contaminants	59
             VI.B.l.  Ethylene Dibromide	61


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VLB.2.  Tetrachloroethylene	64
VLB.3.  Trichloroethylene	67
VI.B.4.   Aldicarb Sulfoxide	70
VI.B.5.   Dieldrin	74
VI.B.6.   Metolachlor	77
VI.B.7.   1,1-Dichloroethane	80
VI.B.8.   Chloromethane  	86
VI.B.9.   Chloroform	91
VLB. 10.  Comparison of Occurrence in URCIS (Round 1) and \
         SDWIS/FED (Round 2)	93
                                IV

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               EPA - OGWDW  Occurrence of Unregulated Contaminants in Public Water Systems
                                  TABLES AND FIGURES


Figure I.E. 1.     Diagram of the Inter-Relationship of Various Databases, Monitoring
                Rounds and Contaminant Lists Discussed in the Report	2

Table I.E. 1.      List and Description of Contaminants with Data in URCIS (Round 1)
                (approximately 1987-1992)	3
Table I.E.2.      List and Description of Contaminants with Data in SDWIS/FED (Round 2)
                (approximately 1993-1997)	6

Table II.A.3.a.   Summary of Data Quantity and Quality in URCIS (Round 1) for the States,
                Tribes, and Territories	12

Table II.B.3.a.   Summary of Data Quantity and Quality in SDWIS/FED (Round 2) for the States,
                Tribes and Territories	16

Table III.B. 1.     Ranking of States based on Number of Manufacturing Establishments per
                Square Mile.  URCIS (Round 1) 24-State Cross-Section in Bold	21

Figure III.B. 1.    Distribution of State Rankings for Manufacturing Establishments / Sq. Mile
                vs. Farm Ag. Chemical Expenses.  Highlighting URCIS (Round 1)
                24 Cross-Section States	23

Figure III.B.2.    24 URCIS (Round 1) Representative Cross-Section States and States Not Included
                in the Cross-Section  	24

Figure III.B. 1 .a.  Distrubution of State Rankings for Manufacturing Establishments / Sq. Mile
                vs. Farm Ag. Chemical Expenses. URCIS (Round  1) 24-State
                Cross-Section Build-up	26

Table III.B.1.a.   Summary and Comparison of Occurrence Results for Incremental National
                Cross-Sections in URCIS (Round 1)	27

Table III.B. l.b.   Trichloroethylene Occurrence for the URCIS (Round  1) Cross-Section States
                and Comparative Biased Groups of States	28

Table III.B.2.a.   Ranking of States based on Number of Manufacturing Establishments per
                Square Mile.  SDWIS/FED  (Round 2) 20 Cross-Section States in Bold	29

Figure III.B.2.a.  Distribution of State Rankings for Manufacturing Establishments / Sq. Mile
                vs. Farm Ag. Chemical Expenses.  Highlighting SDWIS/FED (Round 2)
                20 Cross-Section States	31

Figure III.B.2.b.  20 SDWIS/FED (Round 2)  Cross-Section States and States Not Included
                in the Cross-Section  	32

Table IV. A. 1.     Data Elements Included in the URCIS (Round 1) Database	33

Table IV A.2.     URCIS (Round 1) Data - Number of Records and Systems
                by Source Water  Type	34

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Table IV.A.3.    URCIS (Round 1) Data - Number of Records and Systems by System Type	34
Table IV.A.4.


Table IV. A. 5.

Table IV. A. 6.


Table IV.A.7.


Table IV.B.l.

Table IV.B.2.


Table IV.B.3.


Table IV.B.4.


Table IV.B.5.


Table IV.B.6.


Table IV.B.7.


Table IV.C.l.

Table IV.C.2.


Table V.A1.

Table V.B.I.

Table VI. A. 1.

Table VI.A.2.

Table VI.A.3.


Figure VI.B.l.a.

Figure VLB.l.b.
URCIS (Round 1) Data - Number of Records by Year and
Source Water Type  	35

URCIS (Round 1) Data - Number of Records by Month and Source Water Type  . . 36

Total Number of Public Water Systems by State and Population Size
Category contained in the URCIS (Round 1) Database  	38

Number of Public Water Systems by State, System Type and Population
Size Category contained in the URCIS (Round 1) Database	39

Data Elements Included in the SDWIS/FED (Round 2) Database	40

SDWIS/FED (Round 2) Data - Number of Records and Systems by
Source Water Type  	41

SDWIS/FED (Round 2) Data - Number of Records and Systems by
System Type	41

SDWIS/FED (Round 2) Data - Number of Records by Year and
Source Water Type  	42

SDWIS/FED (Round 2) Data - Number of Records by Month and
Source Water Type  	43

Total Number of Public Water Systems by State and Population Size Category
contained in the SDWIS/FED (Round 2) Database	44

Number of Public Water Systems by State, System Type and Population
Size Category contained in the SDWIS/FED (Round 2) Database	45
States Common to both URCIS (Round 1) and SDWIS/FED (Round 2)
46
URCIS (Round 1) and SDWIS/FED (Round 2) - Reporting Data in
Comparison of Public Water Systems  	48

URCIS (Round 1) Data - 24-State Cross-Section Summary of Occurrence	51

SDWIS/FED (Round 2) Data - 20-State Cross-Section Summary of Occurrence ... 54

Contaminant Occurrence Ranking of URCIS (Round 1) Data	57

Contaminant Occurrence Ranking of SDWIS/FED (Round 2) Data  	58

High Occurrence Contaminants Selected for Graphical and
Spatial Assessments	59

Detections of Ethylene Dibromide - All States with Data in URCIS (Round 1)	61

Distribution of Ethylene Dibromide Occurrence - URCIS (Round 1) Data	62
                                            VI

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Figure VLB.I.e.  Ethylene Dibromide Occurrence By Year - URCIS (Round 1) 	63

Figure VI.B.2.a.  Detections of Tetrachloroethylene - All States with Data in URCIS (Round 1)	64

Figure VI.B.2.b.  Distribution of Tetrachloroethylene Occurrence - URCIS (Round 1) Data	65

Figure VI.B.2.C.  Tetrachloroethylene Occurrence By Year - URCIS (Round 1) 	66

Figure VI.B.S.a.  Detections of Trichloroethylene - All States with Data in URCIS (Round 1)   	67

Figure VI.B.S.b.  Distribution of Trichloroethylene Occurrence - URCIS (Round 1) Data	68

Figure VI.B.3.C.  Trichloroethylene Occurrence By Year - URCIS  (Round 1)	69

Figure VI.BAa.  Detections of Aldicarb Sulfoxide - All  States with Data in SDWIS/FED (Round 2)  . 71

Figure VI.BAb.  Distribution of Aldicarb Sulfoxide Occurrence - SDWIS/FED (Round 2) Data	72

Figure VI.BAc.  Aldicarb Sulfoxide Occurrence By Year - SDWIS/FED (Round 2)	73

Figure VI.B.5.a.  Detections of Dieldrin - All States with Data in SDWIS/FED (Round 2)	74

Figure VI.B.5.b.  Distribution of Dieldrin Occurrence - SDWIS/FED (Round 2) Data 	75

Figure VI.B.5.C.  Dieldrin Occurrence By Year - SDWIS/FED (Round 2)	76

Figure VI.B.6.a.  Detections of Metolachlor - All States  with Data in SDWIS/FED (Round 2)	77

Figure VI.B.6.b.  Distribution of Metolachlor Occurrence - URCIS (Round 1) Data	78

Figure VI.B.6.C.  Metolachlor Occurrence By Year - SDWIS/FED (Round 2)	79

Figure VI.B.7.a.  Detections of 1,1-Dichloroethane - All States with data in URCIS (Round 1)
                and SDWIS/FED (Round 2)	81

Figure VI.B.7.b.  Round 1 and Round 2 cross-section states with PWSs with detections of
                1,1-Dichloroethane and with concentrations above the MCL	82

Figure VI.B.7.C.  States with PWSs with detections of 1,1-Dichloroethane for Round 1 and
                Round 2 cross-section states	83

Figure VI.B.7.d.  1,1-Dichloroethane Occurrence By Year (1984 -  1997)  	84

Figure VI.B.7.e.  Occurrence of 1,1-Dichloroethane By  State - URCIS (Round 1) and
                SDWIS/FED (Round 2)	85

Figure VLB.8.a.  Detections of Chloromethane - All States with Data in URCIS (Round 1) and
                SDWIS/FED (Round 2)	86

Figure VI.B.S.b.  Round 1 and Round 2 cross-section states with PWSs with detections of
                Chloromethane and with concentrations above the Health Reference Level	87
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Figure VI.B.S.c.  States with PWSs with detections of Chloromethane (any PWSs with
                results greater than the detection limit for Round 1 and Round 2
                cross-section states  	
Figure VI.B.S.d.  Chloromethane Occurrence By Year (1984 - 1997) 	89

Figure VI.B.S.e.  Occurrence of Chloromethane By State - URCIS (Round 1) and
                SDWIS/FED (Round 2)	90

Figure VI.B.9.a.  Chloroform Occurrence By Year (1984 - 1997)	91

Figure VI.B.9.b.  Occurrence of Chloroform By State - URCIS (Round 1) and
                SDWIS/FED (Round 2)	92

Figure VI.B.lO.a. Occurrence in URCIS (Round 1) and SDWIS/FED (Round 2)	93
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              EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
                                    APPENDICES


APPENDIX A.       URCIS (Round 1) Data Summary

APPENDIX B.       SDWIS/FED (Round 2) Data Summary

APPENDIX C.       Comparison of URCIS (Round 1) Data to SDWIS/FED (Round 2) Data for
                    Select States and Select Contaminants

APPENDIX D.       Summary Data for URCIS (Round 1) Data and SDWIS/FED (Round 2) Data for
                    Select Contaminants by System Type and Population Served
                                          K

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                                       ACRONYMS



Chemical Abstract Services (CAS)




Chemical Monitoring Reform (CMR)




Community Water System (CWS)




Dibromochloropropane (DBCP)




Environmental Protection Agency (EPA)



Ethylene Dibromide (EDB)




Ground Water (GW)



Ground Water - Purchased (GWP)




Ground Water Under Direct Influence (GUDI)



Ground Water Under Direct Influence - Purchased (GUP)




Health Advisory Level (HAL)




Health Reference Level (HRL)



Inorganic Chemical (IOC)




Maximum Contaminant Level (MCL)



Method Detection Limit (MDL)




micrograms per liter (• g/L)



milligrams per liter  (mg/L)




Minimum Reporting Level (or Limit, MRL)




National Contaminant Occurrence Database  (NCOD)



National Primary Drinking Water Regulations (NPDWRs)




National Water Quality Assessment Program (NAWQA)



Non-Transient Non-Community Water System (NTNCWS)




Office of Ground Water and Drinking Water (OGWDW)



Percentage of Systems with Exceedances (>MCL)




Percentage of Systems with Detections (>MRL)



Public Water System (PWS)





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Public Water System Identifier (PWSID)



Safe Drinking Water Act (SDWA)



Safe Drinking Water Information System (SDWIS)



Safe Drinking Water Information System/Federal Version (SDWIS/FED)



Surface Water (SW)



Surface Water - Purchased (SWP)



Synthetic Organic Chemical (SOC)



Tetrachloroethylene (PCE)



Toxic Release Inventory (TRI)



Transient Non-Community Water System (TNCWS)



Trichloroethylene (TCE)



Trihalomethane (THM)



United States Geological Survey (USGS)



Unregulated Contaminant Monitoring Information System (URCIS)



Unregulated Contaminant Monitoring (UCM)



Unregulated Contaminant Monitoring Regulation (UCMR)



Volatile Organic Chemical (VOC)
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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
                                   EXECUTIVE SUMMARY


       This report presents a comprehensive overview of the assessment and initial analysis of the
unregulated contaminant occurrence data currently available to EPA. The data are from the required
monitoring of unregulated contaminants conducted by public drinking water systems prior to 1998.
Specifically, this report is based on the occurrence data from the Unregulated Contaminant Information
System (URCIS) database (data from Round 1 compliance monitoring) and the Safe Drinking Water
Information System/Federal Version (SDWIS/FED) database (data from Round 2 compliance
monitoring). The objective of this study is to enhance the scientific understanding of the occurrence of
unregulated chemical contaminants in public drinking water systems, and to refine the approach of
management and analysis of contaminant occurrence data.

       The contaminant occurrence analyses and findings presented in this report are based on national
cross-sections of state data (i.e., a subset of representative state data) derived from the URCIS (Round
1) and SDWIS/FED (Round 2) databases.  The occurrence findings presented here are not based on the
entire collection of state compliance monitoring data contained in the URCIS (Round 1) and SDWIS/FED
(Round 2) databases.

       During initial URCIS and SDWIS/FED data quality assessments, significant data quality problems
were identified. The data sources, data quality reviews, and the necessary data editing are described in
detail in Section II of this report.  Due to the data completeness and quality problems inherent in the raw
URCIS and SDWIS/FED data, cross-sections of state data (one using URCIS data, and a second cross-
section using SDWIS/FED data) were constructed to develop a nationally representative perspective for
contaminant occurrence assessments.  The detailed efforts to develop the nationally representative state
cross-sections are described in Section III of this report.

       An overview of data coverage (distribution of system types, months, years, etc. of the occurrence
data) of the two entire databases (and of the two cross-sections) is presented in Section IV.  In Section
V, the contaminant occurrence analytical findings are presented.  Note that the findings are based on the
constructed state cross-sections (not the entire URCIS and SDWIS/FED databases). The key summary
findings are presented in Table V.A.1 (for the URCIS 24-state representative cross-section; see
Appendix A for full detailed findings) and Table V.B.I (for the SDWIS/FED 20-state representative
cross-section; see Appendix B for full detailed findings). Finally, Section VI presents additional
occurrence assessments conducted for select high occurrence contaminants.  The URCIS (Round  1) and
SDWIS/FED (Round 2) data that were used as the basis for the analyses in this report are available upon
request from EPA Office of Ground Water and Drinking Water.  Requests for this data should be sent to
ucmr.report(g),epa. gov.

       The URCIS database (Round 1 monitoring data) contains public water system monitoring results,
generally from 1988 to 1992, for unregulated contaminants collected under the authority of Safe Drinking
Water Act (SDWA).  Forty states/primacy entities have submitted PWS monitoring data to URCIS.
Subsequent Round 2 monitoring data, generally collected from 1993 to 1997, were reported directly to the
SDWIS/FED database. Thirty-five states/primacy entities have submitted Round 2 public water system
monitoring data.  The raw data from these two databases  were reviewed, edited, and "cleaned" for data
quality considerations to ensure consistency and repeatability in the analyses.  (The analytical results
reported here may differ, therefore, from other analyses using raw data from the first two rounds of
unregulated contaminant monitoring that are contained in  the SDWIS/FED database.)

       A data management approach was used in this study to develop the national cross-section of
states that enables occurrence analyses that are indicative of national occurrence.  All states with
monitoring data were first evaluated by their distribution across a range of pollution-potential indicators
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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
and spatial/hydrogeologic diversity.  A select group of states, representing a balanced distribution across
these pollution-potential measures and across the nation geographically, were then used to construct
national cross-sections (one cross-section from Round 1 data, and another from Round 2 data) that would
provide reasonable representation of national occurrence.  While the national cross-sections cannot be
stated to be "statistically representative," the selected URCIS (Round 1) and SDWIS/FED (Round 2)
cross-sections are very large samples (24 and 20 states, respectively), providing analytical occurrence
results that are clear indications of central tendency of the occurrence data, and are generally indicative
of national contaminant occurrence.

       The national cross-sections have been constructed with a large number of occurrence data to
broadly reflect a national coverage. The 24-state cross-section of Round 1 data represent approximately
44% of public water systems nationally and 51% of the population served by public water systems.  The
20-state cross-section of Round 2 data represent approximately 41% of public water systems nationally
and 34% of the population served by public water systems. The data from these two separate groups of
cross-section states are used to compute aggregate contaminant occurrence measures as an
approximation of national occurrence.

       Assessments of data coverage and analyses of unregulated contaminant occurrence are then
presented. Comparisons of Round 1 and Round 2 data coverage were made to evaluate if comparable
states, public water systems, and contaminants are contained in both databases.  Analytical summaries of
occurrence of all contaminants for the Round 1 and Round 2 cross-section states are included, such as the
percent of public water systems with at least one analytical result greater than the Minimum Reporting
Level, the percent of public water systems with at least one analytical result greater than a specified
threshold contaminant concentration (such as a Maximum Contaminant Limit), and the 99th percentile
value.  Additionally, all contaminants in each round are  ranked by occurrence, and a more detailed
graphical and spatial assessment of a select group of high occurrence contaminants  are presented.
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                                   ACKNOWLEDGMENTS


       The compilation and analysis of data presented in this report were undertaken by EPA's Office
of Ground Water and Drinking Water (OGWDW) to enhance the scientific understanding of the
occurrence of unregulated chemical contaminants in public drinking water systems, and to refine the
approach of management and analysis of contaminant occurrence data.  This effort was directed by Mr.
Guy Caruthers of OGWDW. This project began under the direction of Mr. Charles Job.

       We would like to thank the many States, as well as the American Water Works Service
Company, that contributed data sets and valuable advice. Thanks also to the many public water systems
that conducted the monitoring that provided the contaminant occurrence data used in this report. Mr.
Lewis Summers and Mr. Guy Caruthers of OGWDW managed the access to EPA's URCIS and
SDWIS/FED databases, the repositories of data used in this project.

       The Cadmus Group, Inc. served as the prime contractor for this project, supporting the data
management, analysis, and report development. Dr. George Hallberg  served as the Cadmus Project
Manager.
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                                        DISCLAIMER


       This report does not constitute U.S. Environmental Protection Agency Policy. Mention of trade
names or commercial products does not constitute endorsement or recommendation for use.

       This document is designed to provide technical background for the Office of Ground Water and
Drinking Water's program. The document does not, however, substitute for the Safe Drinking Water Act
or EPA's regulations nor is this document a regulation itself.  Thus, it cannot impose legally-binding
requirements on EPA, States, or the regulated community, and may not apply to a particular situation
based on the circumstances.
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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
I.      INTRODUCTION

       This report provides a comprehensive overview of the management and initial analysis of
unregulated contaminant occurrence data currently available to EPA. The data are from the required
compliance monitoring of unregulated contaminants conducted by public drinking water systems prior to
1998. Specifically, this report is based on occurrence data from the URCIS database (Round 1
monitoring data) and the SDWIS/FED database (Round 2 monitoring data). This report presents a
description of URCIS (Round 1) and SDWIS/FED (Round 2) data, identifies the data quality management
necessary to enable occurrence analyses, describes the construction of a representative cross-section of
states from each of the two databases, and summarizes contaminant occurrence analyses based on the
constructed cross-section of states (not on the entire URCIS and SDWIS/FED databases), and includes
spatial and graphical occurrence assessments of select high-occurrence contaminants.

I.A.   Background

       The Safe Drinking Water Act (SDWA), as amended in 1986, required Public Water Systems
(PWSs) to monitor for specified "unregulated" contaminants, on a five year cycle, and to report the
monitoring results to the states. Unregulated contaminants do not have an established or proposed
National Primary Drinking Water Regulation (NPDWR), but they are contaminants that were formally
listed and require monitoring under federal regulations.  The intent was to gather scientific information  on
the occurrence of these contaminants to enable a decision regarding whether regulations were needed.
All non-purchased community water systems (CWSs), and non-purchased non-transient non-community
water systems (NTNCWSs), with greater than 150 service connections were required to conduct this
unregulated contaminant monitoring. Smaller systems were not required to conduct this monitoring, but
were required to be available to monitor if the state decided such monitoring was necessary.  (As evident
in the data, many states did collect data from small systems.)

       The 1993 amendments to SDWA added other contaminants to the unregulated contaminant list
for required monitoring, and the 1996 SDWA amendments directed EPA to develop a revised program for
such monitoring. This new program was formally published in the Federal Register on September 17,
1999 (64 FR 50556) as the Unregulated Contaminant Monitoring Regulation, now referred to as the
UCMR (1999).  The UCMR (1999) and related rules replaced the older requirements and put forth a new
list of contaminants, a new definition of systems that must monitor,  a new structure to the monitoring
program, and a new framework to ensure that all the results are reported to EPA. This UCMR (1999)
monitoring will begin in 2001. The new UCMR must produce a new list of unregulated contaminants for
monitoring every 5-years. This background and history is reviewed here, in part,  because the terminology,
monitoring periods, and lists of monitored contaminants related to unregulated contaminant monitoring
have often been confusing.

       To clarify the history of unregulated contaminant monitoring, a naming system is introduced to
clearly distinguish between the different monitoring periods and the contaminant lists included in a specific
monitoring period.  In this section of the report, a description of which contaminants were monitored
during which monitoring periods, and which contaminants are included in the different data sets used.
The naming system will follow the convention established for the UCMR (1999),  using the year of
promulgation in parenthesis to refer to a specific list of contaminants. For example, the first unregulated
contaminant monitoring list was published in 1987. This specific list of contaminants will be referred to as
the UCM (1987) list. The UCM (1987) list was followed by the UCM (1993) list and the recent UCMR
(1999) list.  This report will only deal with the historic data from the UCM  (1987) and UCM (1993) lists.
Occurrence data for the UCM (1987)  and UCM (1993) contaminants, as well as  for other contaminants
listed in the following  section, are contained in two databases. These databases are described in the
following sections.

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
I.E.   Unregulated and Regulated Contaminants, Databases, and Monitoring Timeframe

       This section describes the contaminants contained in the URCIS (Round 1) and SDWIS/FED
(Round 2) databases and the monitoring periods of these contaminants. Figure I.B.I diagrams the inter-
relationship of the various databases, monitoring rounds and contaminant lists discussed in this report.
Tables I.B.I and I.E.2 describe in more detail the specific contaminants included in each database.

Figure I.B.I. Diagram of the Inter-Relationship of Various Databases, Monitoring Rounds and
Contaminant Lists Discussed in the Report
  URCIS (Round 1)
  (62 Contaminants)
  * refer to Table I.B.I for a
  complete list of contaminants
                                           UCM(1987)
                            20 Mandatory VOCs (Group 3)



                            14 Discretionary VOCs (Group 4)
     Phase I -21 VOCs
     2 Regulated SOCs
                                            5 Miscellaneous Contaminants
  SDWIS/FED (Round 2)
    (48 Contaminants)
     * refer to Table I.E.2 for a
    complete list of contaminants
UCM (1993)-
13 SOCs (Group 1)



1 IOC (Group 2)



UCM(1987) —
                                                                          20 Mandatory VOCs (Group 3)


                                                                          14 Discretionary VOCs (Group 4)
       The UCM (1987) contaminants included 34 volatile organic compounds (VOCs), divided into two
groups: one with 20 VOCs (including the 4 trihalomethanes) for mandatory monitoring, and the other with
14 VOCs for discretionary monitoring. The UCM (1987) contaminants (see Table I.B.I) were first
monitored coincident with the Phase I regulated contaminants, during the 1988-1992 period. This period is
often referred to as "Round 1" monitoring. The monitoring data collected by the PWSs were reported to
the states (as primacy agents), but there was no protocol in place to report these data to EPA. These
data from Round 1 were collected by EPA from many states over time.

       The Round 1 data were put into a database called the Unregulated Contaminant Information
System, or URCIS.  (URCIS and these data will be discussed in more detail in later sections of the
report.)  Most of the Phase 1 regulated contaminants were also VOCs. Both the unregulated and
regulated VOCs are analyzed using the same sample and the same laboratory methods. Hence, the
URCIS database includes data on all  of these 62 Round 1 contaminants:  the 34 UCM (1987) VOCs; the
21 regulated Phase 1 VOCs; 2 regulated synthetic organic contaminants  (SOCs);  and 5 miscellaneous
contaminants that were voluntarily reported by some states (e.g., isomers of other organic contaminants).

       Monitoring for the UCM (1993) contaminants began coincident  with the  Phase II-V regulated
contaminants in 1993 through 1998.  This is often referred to as "Round 2" monitoring.  The UCM (1993)

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
contaminants included 13 SOCs and 1 inorganic contaminant (IOC).  The UCM (1987) contaminants
were also included in the Round 2 monitoring.  In the updated listing for the unregulated contaminants
required for monitoring, the UCM (1993) contaminants were listed as: Group 1 (13 SOCs); Group 2 (1
IOC); Group 3 (the 20 mandatory VOCs in UCM (1987)); and Group 4 (the 14 discretionary VOCs in
UCM (1987)). The group numbering is somewhat reversed, with the first unregulated contaminants, from
UCM (1987), in the last two groups. Table I.B.2 lists all of the 48 contaminants with analytical results
data contained in the  Round 2 database. As with other monitoring data, PWSs reported these results to
the states.  EPA, during the past several years, requested that the states submit these historic data to
EPA.  The Round 2 data that states delivered were submitted directly into the Safe Drinking Water
Information System/Federal version (SDWIS/FED1). Tables I.B.I (URCIS - Round 1) and I.B.2
(SDWIS/FED - Round 2) present the list of contaminants and indicate the monitoring Rounds and Group
reference numbers for the contaminants. (Note that Maximum Contaminant Levels [MCLs], Health
Advisory Levels [HALs], and Health Reference Levels  [HRLs] are used here only as contaminant
concentration reference level to facilitate occurrence assessments in this report. Also note that HALs
used in this report for occurrence reference levels only, were those in place at the time analyses for this
report were conducted.)

       The details of the actual individual monitoring periods are also complex. The timing of required
monitoring was staggered related to different size classes of PWSs, and the program was implemented
somewhat differently  by different states. While Round 1 included the period from 1988-1992, Round 1
also includes older data that are comparable to, but predate, the formal beginning of first round monitoring.
(Further discussion of these details  are beyond the scope of this report.)

Table I.B.I. List and Description  of Contaminants with Data in URCIS (Round 1)
(approximately 1987-1992)
Contaminant
CAS
Number
SDWIS
ID
MCL
HAL *,
or
HRL"
(Hg/L)
uc
Round
UC
Group
Common Sources of Contaminant
Inorganic Chemicals
jNo Inorganic Chemicals in UCM (1987) data
Si

nthetic Organic Chemicals - Regulated
Dibromochloropropane
( 1 ,2-Dibromo-3 -chloropropane;
or DBCP)
Ethylene Dibromide
(1,2-Dibromoethane; or EDB)
96-12-8
106-93-4
2931
2946
0.2
0.05
1
1


R
R
Soil fumigant on soybeans, cotton,
pineapple, orchards
Leaded gas additives; leaching of soil
fumigant
Volatile Organic Chemicals - Group 3

Bromobenzene
Bromodichlorom ethane
Bromoform
Bromomethane
(Methyl Bromide)
Chloroform
Chloroethane
108-86-1
75-27-4
75-25-2
74-83-9
67-66-3
70-00-3
2993
2943
2942
2214
2941
2216
-
60**
400**
10
600**
-
1
1
1
1
1
1
2
2
2
2
2
2
3
3
3
3
3
3
Solvent, organic synthesis
Disinfection-by-product, marine
microalgae
Disinfection-by-product, solvent for
waxes, greases, oils
Soil and space fumigant, extraction
solvent, oceans
Solvent, DBF, auto exhaust, chemical
intermediate
Chemical intermediate, solvent,
aerosol, solvent metabolite
         SDWIS/FED is the official database repository of data provided by public drinking water systems, and
includes data from an earlier EPA public water system database called the Unregulated Contaminant Information
System (URCIS).

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EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Contaminant

Chloromethane
(Methyl Chloride)
Dibromochloromethane
Dibromom ethane
1 , 1 -Dichloroethane
1,3-Dichloropropane
2,2-Dichloropropane
1 , 1 -Dichloropropene
1,3-Dichloropropene
m-Dichlorobenzene
o-Chlorotoluene
p-Chlorotoluene
1,1, 1 ,2-Tetrachloroethane
1,1,2,2-Tetrachloroethane
1,2,3-Trichloropropane
CAS
Number
74-87-3
124-48-1
74-95-3
75-34-3
142-28-9
594-20-7
563-58-6
542-75-6
541-73-1
95-49-8
106-43-4
630-20-6
79-34-5
96-18-4
SDWIS
ID
2210
2944
2408
2978
2412
2416
2410
2413
2967
2965
2966
2986
2988
2414
MCL
HAL *,
or
HRL"
(Hg/L)
3
60**
-
5
-
-
-
40**
600*
100
100
70*
2*
40
UC
Round
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
UC
Group
3
3
3
3
3
3
3
3
3
3
3
3
3
3
Common Sources of Contaminant
Oceans, volcanoes, fires, smoke
exhaust, solvent, DBF
Organic synthesis, manufacture of fire
extinguishing agents, refrigerants,
aerosol propellants and pesticides.
Solvent, gage fluid, use in chemical
synthesis, marine algae
Leaded gasoline; fumigants, paints
Chemical intermediate for
cyclopropane
Solvent
Solvent
Solvent, used in fungicide
Dump leachate, fumigant, solvent,
chemical intermediate
Drain pipe solvent
Solvent, chemical intermediate for
dyes, organic chemicals
Product of manufacture of other
chloroethanes
Used in paint manufacturing; cement;
paint removers; moth-proofing
Paint/varnish remover, solvent,
degreasing agent
Volatile Organic Chemicals - Group 4

Bromochloromethane
Dichlorodifluoromethane
Hexachlorobutadiene
Isopropylbenzene
n-Butylbenzene
n-Propylbenzene
Naphthalene
p-Isopropyltoluene
sec-Butylbenzene
tert-Butylbenzene
1,2,3-Trichlorobenzene
rrichlorofluorom ethane
1,2,4-Trimethylbenzene
1,3,5-Trimethylbenzene
74-97-5
75-71-8
87-68-3
98-82-8
104-51-8
103-65-1
91-20-3
99-87-6
135-98-8
98-06-6
87-61-6
75-69-4
95-63-6
108-67-8
2430
2212
2246
2994
2422
2998
2248
2030
2428
2426
2420
2218
2418
2424
10
1,000
0.9**
-
—
-
140**
-
-
-
-
175*
-
-
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
4
4
4
4
4
4
4
4
4
4
4
4
4
4
Organic synthesis and fire
extinguishers
Refrigerant, aerosol propellant, rocket
propellant, foaming agent, plastics
Solvent, synthetic rubber, pesticide,
insecticide, herbi- cide, chemical
intermediate
Production of petroleum refining;
evaporation and combustion of
petroleum

Solvent, used in textile dyeing and
printing
Fungicide, moth repellant



Termite control; chemical
intermediate
Solvent, chemical intermediate,
lialocarbon aerosol propellant and
refrigerant
Chemical intermediate, solvent,
gasoline, coal tar, and petroleum
products


-------
                   EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Contaminant
CAS
Number
SDWIS
ID
MCL
HAL *,
or
HRL"
(Hg/L)
uc
Round
UC
Group
Common Sources of Contaminant
Volatile Organic Chemicals - Regulated

Benzene
Carbon tetrachloride
Chlorobenzene
cis- 1 ,2-Dichloroethylene
1,2-Dichloroethane
Dichloroethene
Dichloromethane
(Methyl ene chloride)
1,2-Dichloropropane
Ethyl benzene
o-Dichlorobenzene
p-Dichlorobenzene
Styrene
Tetrachloroethylene
Toluene
trans-l,2-Dichloroethylene
1 ,2, 4-Tri chlorobenzene
1,1,1 -Trichloroethane
1 , 1 ,2-Trichloroethane
Trichloroethene
(Trichloroethylene)
Vinyl chloride
Xylenes (Total)
m-Xylene
o-Xylene
p-Xylene
71-43-2
56-23-5
108-90-7
156-59-2
107-06-2
75-35-4
75-09-2
78-87-5
100-41-4
95-50-1
106-46-7
100-42-5
127-18-4
108-88-3
156-60-5
120-82-1
71-55-6
79-00-5
79-01-6
75-01-4
1330-20-7
108-38-3
95-47-6
106-42-3
2990
2982
2989
2380
2980
2977
2964
2983
2992
2968
2969
2996
2987
2991
2979
2378
2981
2985
2984
2976
2955
2995
2997
2962
5
5
100
70
5
7
5
5
700
600
75
100
5
1,000
100
70
200
5
5
2
10,000
—
—
—
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1























2
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R



Some foods; gas, drugs, pesticide,
paint, plastic industries
Solvents and their degradation
products
Waste solvent from metal degreasing
processes, discharge from chemical and
agricultural chemical factories
Waste industrial extraction solvents
Leaded gas, fumigants, paints
Plastics; dyes; perfumes; paints
Paint stripper, metal degreaser,
propellant, extraction
Soil fumigant; waste industrial solvents
Gasoline; insecticides; chemical
manufacturing wastes
Paints, engine cleaning compounds,
dyes, chemical wastes
Room and water deodorants, and
"mothballs"
Plastics, rubber, resin, drug industries;
leachate from city landfills
Improper disposal of dry cleaning and
other solvents
Gasoline additive; manufacturing and
solvent operations
Waste industrial extraction solvents
Herbicide production; dye carrier
Adhesives, aerosols, textiles, paints,
inks, metal degreasers
Solvent in rubber, other organic
products; chemical production wastes
Textiles, adhesives and metal
degreasers
May leach from PVC pipe; formed by
solvent breakdown
By-product of gasoline refining;
paints, inks, detergents
Xylene Isomers
Volatile Organic Chemicals - Other

cis-l,3-Dichloropropylene
trans-l,3-Dichloropropylene
10061-01-5
10061-02-6
2228
2224
-
-
1
1




Used in organic synthesis and soil
fumigants; used as a nematocide
Used in organic synthesis and soil
fumigants for control of nematodes
Includes some regulated SOCs and VOCs, and the unregulated contaminants from UCM (1987) List.  UC Round = data included in
Round 1 and/or 2 monitoring and database; UC Group = contaminant group as specified in UCM (1993) Listing.

MCL=Maximum Contaminant Level
HAL=Health Advisory Level (as of December 2000)
HRL=Health Reference Level (concentration values used only as reference levels for analyses in this report)
The MCL, HAL, and HRL values are used in this report only as reference levels to facilitate occurrence assessments.

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Table I.B.2. List and Description of Contaminants with Data in SDWIS/FED (Round 2)
(approximately 1993-1997)
Contaminant
CAS
Number
SDWIS
ID
MCL
HAL *, or
HRL"
(M8/L)
uc
Round
UC
Group
Common Sources of Contaminant
Synthetic Organic Chemicals - Group 1

Aldicarb
Aldicarb Sulfone
Aldicarb Sulfoxide
Aldrin
Butachlor
Carbaryl
Dicamba
Dieldrin
3 -Hydroxycarbofuran
Methomyl
Metolachlor
Metribuzin
Propachlor
116-06-3
1646-88-4
1646-87-3
309-00-2
23184-66-9
63-25-2
1918-00-9
60-57-1
16655-82-6
16752-77-5
51218-45-2
21087-64-9
1918-16-7
2047
2044
2043
2356
2076
2021
2440
2070
2066
2022
2045
2595
2077
7**
7**
7**
0.002**
-
700
200
0.002**
—
200
70**
91**
90













2
2
2
2
2
2
2
2
2
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
Pesticide used with cotton, potatoes,
others (widely restricted)
Biodegradation of aldicarb
Biodegradation of aldicarb
Soil insecticide
Herbicide for rice, used on annual
grasses
Broad range pesticide (citrus,
vegetables, lawns, nuts)
Herbicide for agriculture, rangeland,
pasture, industry
Insecticide
Metabolite of carbofuran
Insecticide for soybeans, cotton, other
field and fruit crops
Herbicide for corn, soybeans, peanuts,
cotton, pod crops
Herbicide used on grass and broadleaf
weeds
Herbicide for corn and sorghum
Inorganic Chemicals - Group 2

Sulfate
14808-79-8
1055
500,000**

2
2
Fertilizer, natural occurrence, some
industrial uses
Volatile Organic Chemicals - Group 3

Bromobenzene
Bromodichlorom ethane
Bromoform
Bromomethane
(Methyl Bromide)
Chloroethane
Chloroform
Chloromethane
(Methyl Chloride)
Dibromochloromethane
Dibromom ethane
1 , 1 -Dichloroethane
1,3-Dichloropropane
2,2-Dichloropropane
1 , 1 -Dichloropropene
1,3-Dichloropropene
108-86-1
75-27-4
75-25-2
74-83-9
70-00-3
67-66-3
74-87-3
124-48-1
74-95-3
75-34-3
142-28-9
594-20-7
563-58-6
542-75-6
2993
2943
2942
2214
2216
2941
2210
2944
2408
2978
2412
2416
2410
2413
—
60**
400**
10
-
600**
3
60**
-
5
-
—
—
40**
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
3
3
3
3
3
3
3
3
3
3
3
3
3
3
Solvent, organic synthesis
Disinfection-by-product, marine
microalgae
Disinfection-by-product, solvent for
waxes, greases, oils
Soil and space fumigant, extraction
solvent, oceans
Chemical intermediate, solvent,
aerosol, solvent metabolite
Solvent, DBF, auto exhaust, chemical
intermediate
Oceans, volcanoes, fires, smoke
exhaust, solvent, DBF

Solvent, gage fluid, use in chemical
synthesis, marine algae
Leaded gasoline; fumigants, paints
Chemical intermediate for
cyclopropane
Solvent
Solvent
Solvent, used in fungicide

-------
                 EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Contaminant

m-Dichlorobenzene
o-Chlorotoluene
p-Chlorotoluene
1,1, 1 ,2-Tetrachloroethane
1,1,2,2-Tetrachloroethane
1,2,3-Trichloropropane
CAS
Number
541-73-1
95-49-8
106-43-4
630-20-6
79-34-5
96-18-4
SDWIS
ID
2967
2965
2966
2986
2988
2414
MCL
HAL *, or
HRL"
(Hg/L)
600*
100
100
70*
2*
40
UC
Round
1
1
1
1
1
1
2
2
2
2
2
2
UC
Group
3
3
3
3
3
3
Common Sources of Contaminant
Dump leachate, fumigant, solvent,
chemical intermediate
Drain pipe solvent
Solvent, chemical intermediate for
dyes, organic chemicals
Product of manufacture of other
chloroethanes
Used in paint manufacturing; cement;
paint removers; moth-proofing
Paint/varnish remover, solvent,
degreasing agent
Volatile Organic Chemicals - Group 4

Bromochloromethane
Dichlorodifluoromethane
Hexachlorobutadiene
Isopropylbenzene
n-Butylbenzene
n-Propylbenzene
Naphthalene
p-Isopropyltoluene
sec-Butylbenzene
tert-Butylbenzene
1,2,3-Trichlorobenzene
Trichlorofluorom ethane
1,2,4-Trimethylbenzene
1,3,5-Trimethylbenzene
74-97-5
75-71-8
87-68-3
98-82-8
104-51-8
104-51-8
91-20-3
99-87-6
135-98-8
98-06-6
87-61-6
75-69-4
95-63-6
108-67-8
2430
2212
2246
2994
2422
2998
2248
2030
2428
2426
2420
2218
2418
2424
10
1,000
0.9**
-
__
-
140**
-
-
-
-
175*
-
-
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
4
4
4
4
4
4
4
4
4
4
4
4
4
4
Organic synthesis and fire extinguishers
Refrigerant, aerosol propellant, rocket
propellant, foaming agent, plastics
Solvent, synthetic rubber, pesticide,
insecticide, herbi- cide, chemical
intermediate
Production of petroleum refining;
evaporation and combustion of
petroleum

Solvent, used in textile dyeing and
printing
Fungicide, moth repellant



Termite control; chemical intermediate
Solvent, chemical intermediate,
halocarbon aerosol propellant and
refrigerant
Chemical intermediate, solvent,
gasoline, coal tar, and petroleum
products

Includes the unregulated contaminants from UCM (1993) List.  UC Round = data included in Round 1 and/or 2 monitoring and
database; UC Group = contaminant group as specified in UCM (1993) Listing.

MCL=Maximum Contaminant Level
HAL=Health Advisory Level (as of December 2000)
HRL=Health Reference Level (concentration values used only as reference levels for analyses in this report)

The MCL, HAL, and HRL values are used in this report only as reference levels to facilitate occurrence assessments.


I.C.    Data Analysis


        The contaminant occurrence analyses and findings presented in this report are based on national

cross-sections of state data (i.e., a subset of representative state data) derived from the URCIS (Round
1) and SDWIS/FED (Round 2) databases. The occurrence findings presented here are not based on the

-------
               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
entire collection of state compliance monitoring data contained in the URCIS (Round 1) and SDWIS/FED
(Round 2) databases.

       During initial URCIS and SDWIS/FED data quality assessments, significant data quality problems
were identified. The data sources, data quality reviews, and the necessary data editing are described in
detail in Section II of this report. Due to the data completeness and quality problems inherent in the raw
URCIS and SDWIS/FED data, cross-sections of state data (one using URCIS data, and a second cross-
section using SDWIS/FED data) were constructed to develop a nationally  representative perspective for
contaminant occurrence assessments. The detailed efforts to develop the nationally representative state
cross-sections are described in Section III of this report.

       An overview of data coverage (distribution of system types, months, years, etc. of the occurrence
data) of the two entire databases (and of the two cross-sections) is presented in Section IV. In Section
V, the contaminant occurrence analytical findings are presented. Note that the findings are based on the
constructed state cross-sections (not the entire URCIS  and SDWIS/FED databases).  The key summary
findings are presented in Table V.A.1 (for the URCIS 24-state representative  cross-section; see
Appendix A for full detailed findings) and Table V.B.I (for the SDWIS/FED 20-state representative
cross-section; see Appendix B for full detailed findings). Finally, Section VI presents additional
occurrence assessments conducted for select high occurrence contaminants. The URCIS (Round 1) and
SDWIS/FED (Round 2) data that were used as the basis for the analyses in this report are available upon
request from EPA Office of Ground Water and Drinking Water. Requests for this data should be sent to
ucmr.report(g),epa. gov.

       All statistical analyses, and most database manipulations were conducted with SASฎ statistical
software.  Some data formatting problems were  corrected in Microsoftฎ Excel with the aid of specialized
programs written in Visual Basicฎ or were corrected directly in SAS before the analysis began.2 After
analysis, results were typically downloaded into Excel for secondary analysis or sorting or the
development of data tablulation.
II.     DATA SOURCES AND DATA QUALITY REVIEW

II.A.  URCIS (Round 1) Data

       In this section of the report, the URCIS (Round 1) monitoring data (from approximately 1988-
1992) are reviewed regarding quantity, quality, and completeness. The data (as described in Section I)
were derived from EPA's Unregulated Contaminant Information System (URCIS) database.

II.A.1. Description of Data

       URCIS is a compilation of public water system monitoring results for unregulated contaminants,
collected under the authority of SDWA, and reported to the states (as the primacy agents for SDWA).
EPA requested that the states submit these data to EPA in the early 1990s, but no formal protocol or
format had been established for reporting. Given the evolving nature of data management during this era,
various problems were encountered.  The data were supplied by states on a variety of media, ranging
         SAS is a registered trademark of the SAS Institute, Inc. Excel and Visual Basic are trademarks of the
Microsoft Corporation.

-------
                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
from photocopies of hand-written files to electronic files on magnetic tape or diskettes of various kinds,
and in many different formats and software configurations.  Some data were electronically transferrable,
other  data had to be manually entered or re-entered. EPA has been working on the clean-up and analysis
of these data since 1992. Through this long history3, many critical data quality problems were resolved
(such as getting the data into consistent, standard units of measure), or at least resolved to the extent
possible.

        Some preliminary analyses of the URCIS data were presented in the occurrence data report
produced for EPA-OGWDW's Chemical Monitoring Revisions (CMR) project.  This report,^ Review of
Contaminant Occurrence in Public Water Systems (EPA 816-R-99-006, 1999, USEPA, Office of
Water), is referred to as the "CMR Report." In 1999, EPA also transferred the  URCIS data into
SDWIS/FED, in an attempt to join these URCIS Round 1  data with Round 2 data being submitted by the
states into SDWIS/FED. Some preliminary analyses of these joined data were performed 4. Because of
various software and database complications, the transfer of the URCIS data into SDWIS/FED was not
complete, creating problems in the resultant analysis undertaken in the previous  work.  Later, during the
initial analyses of this current report, various data quality problems in the SDWIS/FED-derived URCIS
database itself were identified, particularly in the units  of measure of the recorded analytical results.
Hence, for the analysis presented in this report, the original URCIS database was used.

       The version of URCIS used here as the basis for this analysis was the most complete and current
(1997) edition of this EPA Office of Ground Water and Drinking Water database. The  original, raw
edition of the database was further edited for data  quality considerations, as described below, to ensure
consistency and repeatability in the analyses.  The values  reported here from URCIS may be somewhat
different than in other EPA reviews (or the CMR report) because of the screening and editing  conducted
specifically for this study to ensure consistency in  and dependability of the analyses.

       The URCIS database (as noted in Section I) includes information on 62 contaminants, including:
34 unregulated VOCs; 2 regulated SOCs and 21 regulated VOCs; and various miscellaneous
contaminants reported by the states. The data are reported from  38 states, Washington, D.C.,  and the
Virgin Islands. The data are from the first round of required unregulated contaminant monitoring initiated
in 1987 (i.e., UCM [1987]), but also include older data that are comparable, but  predate, the formal
beginning of Round 1 monitoring.

II.A.2.  Data Management and Data Quality

       During  1997-1998, the URCIS database was reviewed for various  data quality  problems and
subsequently  edited to remove problematic data to ensure  the quality of the data used in the analysis.  The
data were first downloaded from the URCIS database.  In the process of initial download and translation,
unreadable lines of text and characters were apparently introduced into the data set, and were  therefore
         For example, Fallen, Fran, 1994 (November), "Unregulated Contaminants Information System (URCIS)
System Inventory." Computer Sciences Corp, 1993 (March), "Unregulated Contaminants Maintenance Manual."
Fallen, Fran, 1993 (December), "Unregulated Contaminants Maintenance Manual Supplement."  Computer Sciences
Corp, 1992 (July), "A Statistical Survey of the Unregulated Contaminant Data."  (All of these internal reports contain
many pages of text, sometimes unnumbered, and typically many pages of unnumbered tabulated data and/or
computer code.)

         SAIC, 1999 (June), "Unregulated Contaminant Occurrence Results for Round One Monitoring," SAIC
Project 01-0833-08-3559-030. EPA Contract 68-C6-0059.

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                EPA - OGWDW  Occurrence of Unregulated Contaminants in Public Water Systems
deleted. (These lines did not appear to be actual data, but were artifacts related to download, translation,
and merger of various data sets from URCIS.) Additionally, data from 946 systems of unknown source
water type were eliminated. (Other systems had no source type specified, but this missing inventory
information was supplemented with SDWIS inventory data.) Five observations with contaminant
concentrations greater than 9,000 micrograms/Liter were excluded from the analysis (as presumed errors;
this outlier editing was consistent with other processing that EPA has completed, see CMR report).
Another 1,503 observations with erroneous sampling dates (e.g., years indicated as 00, 01, 39, etc.) were
eliminated.

       Some sample identification numbers from six states were missing required digits (they had an
inadequate number of sample ID numbers to define a unique sample, as compared to other sample IDs).
New sample numbers were assigned by concatenating the system ID with the original sample ID so that
a given sample number was unique and could not appear more than once in the database.  Also, the
analyses noted that some data from 357 systems were sometimes identified as ground water systems and
at other times as surface water systems.   These records were presumably from systems with mixed
water sources. The inclusion of these data results in a very slight overcount of systems (when totaled by
system and source), but these mixed source results comprise only a very small amount of data.

       Some further editing was performed for this current analysis. Some URCIS analytical  results
included unidentified contaminant codes.  These data were merged with a list of contaminants based on
the Chemical Abstract Services (CAS) number to identify the chemical name. Five contaminant codes
used in URCIS, totaling 22,548 records, did not match any contaminants on the CAS list.  These records
were removed from the database to ensure quality of analysis. Systems with a system type recorded as
"NP", i.e., non-public, were also removed, because it is unclear what this designation means regarding
type(s) of system. Also, some data were  included in the original URCIS database that date from the first
3 months of 1993.  The inclusion of 1993 data was not consistent among states, some states included only
partial records,  and 1993 data are also included in Round 2. Hence, for consistency, the samples
recorded after 1992 (14,221 observations) were removed from the URCIS database prior to analysis.

       For some records, the data were of good quality, but some system inventory information was
missing. To enable use of these URCIS data records, the URCIS data were merged by PWSID with
current SDWIS-Needs Survey PWS Inventory data to obtain missing system inventory information data
on the source water, system type and population served for the PWSs. Note that these inventory data are
from 1999.  While URCIS  data are from an earlier period, the inventory provided a consistent source to
update the information. After these data management and editing efforts, there are 3,452,530 analytical
records for the 62 contaminants for analysis of the Round 1 data.

       Even with this extensive data management effort, there will still be data quality problems given
the diverse sources of these data and the sheer size of the database. Sources of problems may  include
some analytical results recorded in incorrect units, (e.g., the results are actually in mg/L, but are recorded
as • g/L) or data units mistakenly converted in the original compilation of the data (e.g., the data units
were actually in • g/L, were incorrectly assumed to be in mg/L, and were then mistakenly converted to
• g/L as if they were mg/L).  Recent reviews of the original database indicate that this does not appear to
affect many  data.  There are a few abnormally high concentrations (outliers) that may be affected  by this
units problem. While outliers affect a review of the maximum concentration values of a contaminant,
there are few such data and they will have limited impact on other occurrence statistics reviewed in this
report. (For most analytical summaries included in this report, the value of the 99th percentile is presented
to avoid this problem.)
                                               10

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
II.A.3.  Further Data Review and Editing

        Subsequent to the major editing efforts on this database, a basic analysis of the 3.5 million records
was undertaken.  As a first step, various descriptive statistics were compiled by state to enable a further
data review for bias and representativeness.  Some state data, as will be described, are so incomplete that
their use would introduce bias into the analyses.  These data are used in certain parts of this report to
provide context or reference, but not to make determinations based on their occurrence analyses.

        Table II.A.3.a summarizes some key results from this next stage data review.  The table
summarizes the data availability for 57 primacy entities considered under SDWA: the 50 states, 5
territories, the District of Columbia, and an aggregate entry for the Native American tribes.  Within
URCIS (Round 1), there are data for 38 states, the Virgin Islands, and Washington, D.C., and no data for
17 primacy entities. Some states only reported data for detections. For 8 states (listed in the column
labeled "Data sets with 100% Detects"), the percent of samples with analytical detections (or in other
words, the percent of samples with analytical results greater than the detection level of the Minimum
Reporting Level, labeled in the tables as "Percent Sample Detections") range from 80-100%.  These
states only reported data for detections and, hence, are highly biased (they did not report the majority of
the monitoring sample results for which there were no detections above the Minimum Reporting Level, or
MRL).  As presented in the table, the percent of samples with detections (aggregating all the data),
typically ranges from 1-3% for states with complete data reporting. Besides this obvious source of bias,
the apparent completeness of the data related to the number of PWSs represented was also reviewed.

        The number of unique PWSs included in each state's data record is shown in Table II.A.3.a.
The number of PWSs included in Round 1 were compared to the total number  of nonpurchased CWSs
and NTNCWSs in the current state inventory, and to the number of nonpurchased CWSs and NTNCWSs
serving more than 500 people (since not all small systems may have had to conduct this monitoring).  The
states listed as "Most Complete Data sets" all approximated or exceeded 100% of one of these numbers
(i.e., New Mexico's Round 1 PWS numbers were only 70% of their current total inventory, but equaled
300% of the number of systems serving more than 500 persons). The states listed as "Significantly Too
Few Systems" had far less representativeness.  For example, Colorado only has data in Round 1 for 60
PWSs.  This represents only 24% of the reported number of systems in their inventory lists. Also,
Colorado data show 34% of all sample data are detections. Further review suggests that their data mainly
include records for systems that had detections, but that analytical records were provided for all samples
for these systems.  This partial, selective reporting lowers the percent of sample records that represent
detections (to less than 100% detection), but still reflects biased reporting and creates a biased analytical
record, since not all no-detection records have been reported (such as records from the likely large
number of systems with no detections). In other cases, it is not clear what the data represent. Nevada's
reported percent samples with detections suggests the data may be complete, but there is only data for 10
systems, only about 3%  of systems compared to state inventory records. Another 5 states are listed as
having too few systems.

        Also shown in Table II.A.3.a is the number of samples per PWS in each state's data.  This
summary statistic provides a perspective on the relative completeness of reporting.  For example, the
states reporting only samples with detections typically report 2 to 10 samples per PWS. For most states,
approximately 100 to 300 samples are collected and reported per PWS.

        The last column on Table II.A.3.a  lists states with data records that are not complete (i.e., less
than 100% of systems reported as based on inventory listings), but that have other parameters (e.g.,
"Percent Sample Detections", "Samples per PWS", etc.) that suggest that the  data are balanced and

                                               ll

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
perhaps complete for the systems that did report.  The relatively low system numbers may simply relate to
how the state implemented the program (e.g., implementation related to system size or other waivers,
etc.). Florida reports data for 855 PWSs, a substantive number, but they also have a large inventory.

Table II.A.3.a.  Summary of Data Quantity and Quality in URCIS (Round 1) for the States, Tribes, and
Territories.
States/ Tribes/
Territories
1
9
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
Alabama
Alaska
American
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
Florida
Georgia
Guam
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Marianna
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Puerto Rico
Rhode Island
Total
Uniqu
e
PWSs
152
748
-
973
6
4,167
60
-
13
855
1,165
-
127
-
1,307
415
1,002
-
525
13
-
-
998
220
139
1,565
206
85
565
214
10
201
1,551
617
357
298
-
2,657
-
-
-
-
-
Percent
Sample
Detectio
ns
5%
2%

1%
100%
7%
34%

6%
20%
2%

1%

5%
4%
5%

3%
3%


2%
91%
100%
1%
100%
1%
2%
100%
2%
100%
2%
0%
1%
2%

1%





Sample
s per
PWS
136
132

151
5
111
38

1,207
14
120

370

147
292
62

273
95


105
14
16
100
6
215
94
6
860
5
94
151
348
134

313





No Data in
Database


American




Connecticut



Guam

Idaho



Kansas


Maine
Marianna














North Dakota

Oklahoma
Oregon
Pennsylvania
Puerto Rico
Rhode Island
Data sets
with 100%
Detects




Arkansas


















Massachusetts
Michigan

Mississippi


Nebraska

New











Significant
ly Too Few
Systems






Colorado

Delaware










Louisiana







Missouri


Nevada












States Usable for Cross-
Section
Most Complete
Data sets

Alaska

Arizona

California




Georgia

Hawaii

Illinois
Indiana
Iowa

Kentucky



Maryland


Minnesota


Montana



New Jersey
New Mexico



Ohio





Incomplete
but
Adequate
Data sets
Alabama








Florida
























New York
North







                                                12

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
States/ Tribes/
Territories
44
45
46
47
48
49
50
51
52
53
54
55
56
57

South Carolina
South Dakota
Tennessee
Texas
Tribes
Utah
Vermont
Virgin Islands
Virginia
Washington
Washington,
West Virginia
Wisconsin
Wyoming
TOT4L
Total
Uniqu
e
PWSs
-
335
306
124
-
430
133
3
-
992
1
139
-
145
23,819
Percent
Sample
Detectio
ns

4%
4%
98%

1%
82%
9%

1%
5%
6%

3%
2.9%
Sample
s per
PWS

52
197
2

150
10
186

229
3,432
157

125
146
No Data in
Database
South Carolina



Tribes



Virginia



Wisconsin

17
Data sets
with 100%
Detects



Texas


Vermont







8
Significant
ly Too Few
Systems














5
States Usable for Cross-
Section
Most Complete
Data sets

South Dakota
Tennessee


Utah



Washington
Washington,


Wyoming
21
Incomplete
but
Adequate
Data sets







Virgin Islands



West Virginia


6
       In summary, of the 40 states/territories with data in URCIS (Round 1), 21 states have records
that appear relatively complete and balanced, and another 6 have records that likely are balanced and
with a substantial (though not complete) number of systems. The data from these 27 states should
provide the most complete and unbiased summary of the occurrence data; the remaining 13 states are
clearly biased since results are reported only (or primarily) for detections.  To present a national summary
of the data, the 27 primacy entities with most complete records (the 27 States identified in the two far-
right columns in Table II.A.S.a, "Most Complete Data Sets," and "Incomplete but Adequate,") were
evaluated for their national representativeness and considered for inclusion in the subsequent analyses.
(The assessment of national representativeness is discussed further in Section III.)

       From these 27 states (primacy entities) with reasonably complete data, three primacy  entities
were removed.  Washington, D.C. and the Virgin Islands were removed because they are not states, and
the New York State data were excluded because there were various and numerous  problems associated
with the data and metadata.  For example, New York did not use standard PWSIDs  that could be
associated with  SDWIS records, and the total number of reporting PWSs in the New York data set
represented only 12 to 40%  of the expected number of PWSs as based on the state's inventory numbers.
Also, there were some embedded errors in the data that sometimes caused data processing problems.
Therefore, as summarized in Section IV, V and VI,  URCIS (Round 1) data are aggregated for a
representative cross-section of 24 states (the 27 entities less Washington, D.C., the Virgin Islands, and
New York), which is used as the basis for most of the analyses in this report.

II.B.  SDWIS/FED (Round 2) Data

       In this section of the report, the monitoring results for the UCM (1993) list of unregulated
contaminants, from Round 2 (approximately 1992-1997), are analyzed and reviewed. These Round 2 data
(as discussed in Section I) were derived from the Safe Drinking Water Information  System/Federal
Version (SDWIS/FED). Significant data review, formatting, and data quality checking and editing were
required of this Round 2 data to enable the evaluations and analyses conducted for this initial contaminant
occurrence assessment.
                                               13

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
II.B.1.  Description of Data

        Data for this study were downloaded from the SDWIS/FED database, and include information on
unregulated contaminants.  (Unregulated contaminants are not formally regulated by EPA, but monitoring
of these contaminants is required, and therefore many occurrence data are available.)  The unregulated
data include records from the second round of unregulated contaminant monitoring (referred to as "Round
2") that were submitted directly into SDWIS/FED (see Section I.E. for more details).

        The analyses in this section of the report are based on data for unregulated contaminants from
these SDWIS/FED Round  2 data.  These data were generated through monitoring conducted during
Round 2 of required unregulated contaminant monitoring initiated in 1993 (i.e., UCM [1993]). (Although
second round monitoring was formally initiated in 1993, SDWIS/FED [Round 2] data can include older
data that are comparable to, but predate, the formal second round monitoring.)  The SDWIS/FED (Round
2) data includes information on 48 contaminants, including: 1 IOC, 13 SOCs, 20 mandatory VOCs
(including 4 THMs) and 14 discretionary VOCs.  SDWIS/FED  contained Round 2 data from 35
states/primacy entities.

II.B.2.  Data Management and Data Quality

        The SDWIS/FED Round 2 data from the 35 states/primacy entities contained a total of 4,350,874
(raw) records.  An important and substantial component of this  study consisted of the detailed and
extensive review of these data records for numerous data quality considerations including reporting
consistencies, uniform and  valid coding, data completeness, correct and consistent use of analytical units,
and any inherent bias in the raw records. (The sources of bias are discussed later in this section.) To
ensure data quality for sound and dependable occurrence analysis, extensive data review, checking, and
editing were required. This data management and quality review process identified and addressed
problematic data or data that could not be uniquely categorized.  The following are common types of data
problems that were addressed: records with invalid contaminant codes, systems with unknown source
water or system type codes, state records for specific contaminants that reported only detections,  or
entire state records that appeared to have extremely and consistently low concentrations for analytical
results.  These types of records were either deleted (such as when water source or system type codes
were invalid) or converted  (when a data units conversion appeared straightforward).  For example, upon
detailed review, the data from five states -Kentucky, Michigan, North Carolina, Oregon and Washington-
appeared to have been recorded or mislabeled in incorrect units. In these cases, detailed double-checking
with the analytical results for other Round 2 states, with URCIS Round 1 data, as well  as with original
state data sets (when available) showed that the analytical results appeared to be incorrect (too low) by a
constant factor of 1,000. The interpretation was that the data were (mistakenly) recorded in • g/L in the
database, but actually represented data in mg/L.  These data corrections were somewhat straightforward
after identifying, reviewing, and cross-checking the analytical results.  Other specific data editing
examples are listed below in  Section II.B.3.

        Another more general data management decision related to data from transient and "non-public"
water systems.  Transient PWSs were not required by federal rule to monitor for most of the
contaminants of interest in  this study. However, some states required monitoring, and some transient
system contaminant occurrence data is included in SDWIS/FED. By definition, the transient nature of
these PWSs confound the types of contaminant exposure assessments ultimately to be  conducted for this
study. To avoid the problems associated with transient sources  in exposure studies, systems with a
system type recorded as "NC" (non-community, meaning transient) were not included  in the occurrence
analyses.  In the raw Round 2 data, 24% of the total number  of systems were listed  as "NC", and were

                                               14

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
omitted from the occurrence analyses.  Also, 0.3% of the total number of systems were identified as
"NP", or non-public.  Since this is not a valid system type code (and the exact definition of non-public
could not be determined), records designated as NP were also omitted from the analyses.  Note that
although the systems identified as NC (transient) or NP (non-public) represented slightly more than 24%
of the total number of systems, these systems represent only 3.2% of the analytical sample results.

       With these data quality improvements, the initial 4,350,874 analytical records from the 35
states/primacy entities for the 48 contaminants decreased to 4,211,446 analytical records for this Round 2
analysis (this total analytical record count includes the approximately 900,000 records with converted
units).

II.B.3. Further Data Review and Editing

       Subsequent to this initial editing and filtering of the data, a basic analysis of the 4.21 million
records was undertaken.  Similar to the editing process used with the URCIS (Round 1) data, various
descriptive statistics were compiled by state to enable a further more detailed data review to assess data
bias and representativeness. Some state data, as described below, are so incomplete that their use would
introduce bias, and should only be used with caution for any statistical summary of occurrence.

       Table II.B.3.a summarizes some key results from this next stage of Round 2 data review. The
table summarizes the data availability and data quality for 57 primacy entities considered under SDWA
(the 50 states, 5 territories and the District of Columbia, and an aggregate entry for the Native American
tribes). Of the 57 primacy entities in SDWIS/FED (Round 2), 35  have reported Round 2 data and 22
have not.

       Of the 35 states with Round 2 data, 15 states have incomplete data and/or data of inadequate
quality. For two states (Alabama and Mississippi), the percent of samples with detections (with analytical
results greater than the minimum reporting level; "Percent Sample Detections") ranges from 70-100%.
These states are listed in Table II.B.3.a in the column labeled "Data sets with 100% Detects".  These
states reported only (or mainly) analytical records for detections and, hence, their  data sets are highly
biased (over-representing occurrence) and are therefore excluded  from additional analysis.  As can be
seen in the table, the percent samples with detections typically ranges from 1 to 8% for states with
approximately complete data reporting. An additional review of these two biased states is the measure of
the number of samples per PWS. The numbers of samples per PWS for Alabama (2 samples/PWS)  and
Mississippi (4 samples/PWS) are significantly below the common range of 50 to 250 sample per PWS in
most states.  In addition to this clear source of bias, we also reviewed the apparent completeness of the
data related to the number of PWSs represented.

       The number of unique PWSs included in each state's data sets, and the number of samples per
PWS, are also included in Table II.B.3.a.  These summary statistics provide a perspective on the relative
completeness of reporting. The number of PWSs included were compared to the  total number of
nonpurchased CWSs and NTNCWSs in the current state inventory,  and to the number of nonpurchased
CWSs and NTNCWSs serving more than 500 people (since not all small systems  may have had to
conduct this  monitoring).  Most states approximated or exceeded 100% of one of these comparative
inventory numbers.  The states listed in the "Too Few Systems" column have data reported from far
fewer systems than listed in the current state inventory.  For example, New Jersey (17 PWSs) and
California (67 PWSs) have far too few systems with data in SDWIS/FED (Round 2) based on this
comparison.  Therefore, to reduce potential analytical results bias, New Jersey, California, and 7 other
                                               15

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
states are excluded from the analyses since a significant portion of PWSs in these states do not have
contaminant occurrence data in SDWIS/FED (Round 2).

        States with data quality problems are also indicated in Table II.B.S.a. The data from Louisiana,
Pennsylvania, South Carolina, and Vermont were very problematic. For instance, 100% of the data
reported by Louisiana were non-detections; there were no positive analytical findings of contaminant
occurrence in thel64,492 sample results reported.  Data from the other 3 states were very inconsistent
(e.g., data for VOCs within a single state appeared to be reported in mixed units). The level of detail and
effort required to check and correct these types of data problems with state data management staff (if
possible at all) are beyond the resources and schedule of this study. The data from these four states were
excluded from the analysis.

        The last column in Table II.B.S.a, "States Usable for Cross-Section," lists states with data
records that are reasonably balanced and perhaps complete for the systems that did report. These 20
Round 2 primacy entities with adequate and unbiased data were further considered for occurrence
analyses.

Table II.B.3.a. Summary of Data Quantity and Quality in SDWIS/FED (Round 2) for the States,  Tribes
and Territories.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
State/ Tribes/
Territories
Alabama
Alaska
American
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
Florida
Georgia
Guam
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Marianna
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
Total
Unique
PWSs
314
625
-
123
577
67
833
87
-
-
-
-
-
-
-
120
-
-
445
1,394
745
-
1,015
506
3,209
1,581
1,155
1,434
-
-
-
Percent
Sample
Detections
94.08%
3.10%

2.75%
7.29%
6.75%
3.72%
4.53%







2.26%


7.50%
0.00%
0.89%

0.62%
3.12%
7.26%
1.66%
71.27%
6.08%



Samples
per PWS
2
194

55
118
44
143
921







58


125
118
163

140
125
97
198
4
109



No Data in
Database


American





Delaware
Florida
Georgia
Guam
Hawaii
Idaho
Illinois

Iowa
Kansas



Marianna






Montana
Nebraska
Nevada
Data sets
with
100%
Alabama

























Mississippi




Significantl
y Too Few
Systems



Arizona

California

Connecticut







Indiana















Data Quality
Problems



















Louisiana











States
Usable for
Cross-

Alaska


Arkansas

Colorado











Kentucky

Maine

Maryland
Massachusetts
Michigan
Minnesota

Missouri



                                                16

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems

32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57

State/ Tribes/
Territories
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Puerto Rico
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Tribes
Utah
Vermont
Virgin Islands
Virginia
Washington
Washington,
West Virginia
Wisconsin
Wyoming
TOT4L
Total
Unique
PWSs
849
17
755
-
2,263
296
2,259
888
1,168
1,424
-
117
1,047
27
78
4,863
26
-
636
-
-
2,680
-
-
225
-
33,848
Percent
Sample
Detections
5.45%
2.32%
0.75%

2.05%
7.73%
3.45%
3.99%
1.66%
10.19%

0.30%
0.33%
2.34%
9.31%
1.23%
1.22%

2.65%


2.23%


1.41%

2.95%
Samples
per PWS
23
28
277

55
59
291
180
75
16

136
147
40
147
124
57

74


123


51

124
No Data in
Database



New York






Puerto Rico






Utah

Virgin Islands
Virginia

Washington,
West Virginia

Wyoming
22
Data sets
with
100%


























2
Significant!
y Too Few
Systems

New Jersey











South
Tennessee

Tribes







Wisconsin

9
Data Quality
Problems









Pennsylvania


South Carolina





Vermont







4
States
Usable for
Cross-
New

New Mexico

North
North Dakota
Ohio
Oklahoma
Oregon


Rhode Island



Texas





Washington




20
       The next level of data evaluation assessed the analytical results for each state in even more
detail.  For example, the minimum, median, 99th percentile, and maximum analytical values were
determined for every contaminant in each state. With this more in-depth level of analysis, some additional
data quality problems were identified within the data sets of the 20 Round 2 cross-section states.  Most of
these problems were determined to be specific to certain contaminants (or contaminant groups).  With
additional data editing efforts, these problems have either been resolved or the problematic portion of data
omitted from further analysis.

       The problematic Arkansas data is limited to the VOCs. There were 73 very similar, low VOC
detections at 73 different PWSs (one VOC detection at each of 73 PWSs).  The resulting calculated
percent of systems and percent of samples with analytical detections for these 73 VOCs was nearly
identical.  Also, the percent of detections in Arkansas for these VOCs was considerably higher (up to  100
times higher) than that of any other state. Through several communications with the data management
staff in Arkansas, it was determined that these records were actually semi-quantitative analytical results
at levels below the method reporting level (non-detections) and had been mistakenly recorded as
analytical detections. To correct this mistake, the Arkansas VOC records with a reported concentration
of less  than 0.5 • g/L (the EPA VOC detection limit) were changed to non-detections, correcting the
problematic analytical results.

       Massachusetts SOC data were also problematic. Massachusetts reported Round 2 sample
results  for SOCs from only 56 PWSs, while reporting VOC results from over 400 PWSs.  Massachusetts
                                               17

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               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
SOC data also contained an atypically high percentage of systems with analytical detections compared to
all other states.  Through communications with Massachusetts data management staff, it was determined
that the state's SOC data, as well as the SDWIS/FED (Round 2) Massachusetts SOC data, were
incomplete.  For instance,  the SDWIS/FED (Round 2) data for Massachusetts indicates  18% systems
with reported detections of aldrin. The average percent of systems with aldrin detections for all other
states was 0.2%. In contrast, Massachusetts data characteristics and quantities for lOCs and VOCs
were reasonable and comparable with other states' results.  Therefore, Massachusetts was included in
the group of 20 SDWIS/FED (Round 2) cross-section states with usable data for lOCs and VOCs,
though its SOC data were omitted from occurrence analyses and summaries.

       Other types of data problems were present in Pennsylvania.  After an initial data review, the raw
Pennsylvania records indicated nearly a dozen analytical results with extremely high concentrations of all
unregulated SOCs. Pennsylvania state data management staff were contacted, and after their review of
the data records, it was determined that the very high concentrations that were reported  were incorrect
(likely with incorrect units) and these records were deleted. (Note that even with these data corrections,
Pennsylvania state data still could not be used in the cross-section analyses because there appear to be
significantly too few samples per system as well as an unusually high percentage of systems with
detections, indicated that many systems without analytical detections did not report  results.)

       And, similarly, the detailed data review indicated that New Hampshire data  contained only
detections for the  14 discretionary VOCs and these records were from no more than four PWSs.  New
Hampshire IOC and SOC data quality and completeness appeared reasonable.  Therefore, the state was
retained in the group of 20 cross-section states, but its data for the 14 discretionary VOCs were omitted
from the occurrence analyses and summaries. As summarized in Section IV, V and VI, SDWIS/FED
(Round 2) data  are aggregated for a representative cross-section  of 20 states, which is used as the basis
for most of the analyses in this report.
III.    DEVELOPING A NATIONALLY REPRESENTATIVE PERSPECTIVE

       As discussed in Sections I and II, the URCIS database contains contaminant occurrence data
from a total of 40 states, and territories (38 states plus Washington, D.C. and Virgin Islands). However,
data from many states are incomplete and biased.  Our evaluation suggested that data from 25 states
(plus D.C. and the Virgin Islands, totaling 27 primacy entities) were most complete and might be used to
generate national summary statistics on occurrence of the contaminants in URCIS. Data from 25 of the
50 states is a substantial sample. The data from all of these states could simply be aggregated to compute
a composite, national occurrence value for a contaminant.  However, even a 50%  sample does not
guarantee that the sample is representative because the data were not collected in a systematic or random
statistical framework. The 50% sample could be heavily skewed to low-occurrence or high-occurrence
settings.  Hence, the state data were evaluated to assess how representative they were across the range,
from high to low, of likely contaminant occurrence and across the spatial/hydrologic diversity of the
nation. Based on these assessments, the construction of a cross-section of states from the available state
data sets would provide a reasonable representation of national occurrence.

       There are many sophisticated statistical methods that can be applied  to analyze limited (and
biased) data.  However, this first stage of evaluating the URCIS  occurrence data was to establish a
representative cross-section of data for first-stage analyses. This representative cross-section would also
be the basis for subsequent analyses as deemed necessary and appropriate by the findings.  For this initial
analysis, we used the approach that was developed for the CMR report, A Review of Contaminant
Occurrence in Public Water Systems (EPA 816-R-99-006, 1999), to establish a national cross-section

                                               18

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
from state SDWA contaminant databases. This approach was supported by peer reviewers and by
stakeholders as providing a clear, repeatable, and understandable approach.  It cannot provide a
"statistically representative" sample, because the data were not selected in an appropriate fashion. The
resultant data should, however, provide a clear indication of the central tendency of the national data.

III.A.  Methods

        For the CMR Report (referenced above), a protocol was developed for determining a
representative cross-section of states for occurrence analysis. In the CMR analysis, contaminant data
were available from 14 states.  The state data were first evaluated for completeness  and quality, similar to
the analysis in this report. The balance of the states was then evaluated to establish  a national cross-
section.  In the CMR process, eight states were selected for use in a national analysis as providing the
best data quality and completeness, and for providing a balanced national cross-section of occurrence
data. The CMR process  was based on evaluating the states' pollution potential and geographic coverage
in relation to all states. The URCIS and SDWIS/FED states were evaluated using the same selection
process.

        Two broad factors were considered in the assessment of a representative cross-section: pollution
potential and geographic  or spatial diversity.  Pollution potential is considered to ensure that the selection
of cross-section states represents the range of likely high, medium, and low contaminant occurrence.
Geographic consideration is included so that the wide range of climatic and hydrogeologic conditions
across the United States  are represented,  again balancing the varied conditions that affect transport and
fate of contaminants. Many past EPA studies have shown that some simple measures, such as population
(or population density) are valid indicators of pollution, because it is human activity and related land use
that are the source of most pollutants, particularly the organic chemicals. Various demographic and other
factors were evaluated as independent measures or indicators of pollution potential.  (Over 30 factors
were evaluated in the CMR report; only the final approach is described here.)

        For this analysis, two primary pollution potential indicators were used to evaluate the
representativeness of the states.  The first factor indicates the pollution potential from manufacturing and
the second factor refers to pollution potential from agriculture in  each state.  (Manufacturing and
population density typically are related to the occurrence of VOCs, many of which are industrial
chemicals, for example.  Most of the SOCs of concern are pesticides, and the greatest use of most of
these is in agriculture.) States were ranked from 1 to 50 for each factor and divided into quartiles based
on the ranking. The rankings were reviewed to assess if states could be  selected in approximate balance
from each quartile.  In addition, some secondary pollution potential indicators were also considered to
further ensure that the data were representative.

III.A.1.  Manufacturing Indicators

        Numerous factors were considered in the CMR analysis as potential indicators of manufacturing-
related pollution, including EPA's Toxic Release Inventory (TRI)  (including total releases, releases per
square mile, and releases excluding air releases), the number of manufacturing establishments, the
number of manufacturing establishments per square mile, the number of manufacturing employees, the
product value  added by manufacturers, and the value added per capita. (See Annual Survey of
Manufacturers,  1995; Census of Manufacturers,  1992; and Toxic Release Inventory, 1995). These
factors were each considered  in terms of their inherent value as pollution potential indicators, their range
and variance (in providing a relative ranking of the states), and their inter-relationships.
                                                 19

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
        The total TRI releases per square mile, number of manufacturing establishments per square mile,
and value added per capita were considered the three most useful indicators.  The TRI was considered
useful because it is a measure of how many pounds of toxic chemicals are released within the state.
While there are problems with the TRI (e.g., some inconsistent release estimation techniques, omission of
many small establishments, or those with releases below specified thresholds), it can be used as a valid
and direct indicator of pollutant potential as based on past pollutant releases. The number of
manufacturing establishments per square mile takes into account how many factories are actually
engaged in manufacturing and thus how many establishments potentially contribute to pollution.  By using
the number of manufacturing establishments on a density basis, i.e., per square mile, the size of the state
is also taken into  account. The final factor that was considered to be viable was the value added by
manufacturers per capita.  Initially this seemed to be a well-suited measure because of the presumed
correlation between value added and the level of production (and by-product pollution) within the state.
The drawback with this measure (and also with the measure of number of manufacturing establishments
per square mile),  is that it does not necessarily reflect the reality that  different industries release different
amounts of pollutants.  For example, an industry that adds a lot of value to a product may cause little
pollution while another industry that does not add much value may contribute more pollution.

        There exists a strong correlation and linear association between the number of manufacturing
establishments per square mile and the population density in each state, as well as with the total TRI
pounds  released per square mile, number of manufacturing employees, and total value added.
Importantly, the manufacturing data are very consistently collected. Hence, the number of manufacturing
establishments per square mile was used as the primary indicator. Also, Squillace and others (1999)
found a significant correlation between VOC occurrence in ambient ground water and population density.
As noted,  population density and manufacturing density are highly correlated.  The other key reason for
choosing this factor was that it is a simple measure of how many establishments are actually engaged in
manufacturing and thus might potentially contribute to polluting sources of drinking water.  The TRI total
pounds  released per square mile was used as a secondary factor in determining representativeness and
results in a very similar stratification.  Manufacturing density (with its correlation to the TRI data) is used
in this ranking because it is considered a more direct measure of pollution potential for this study.

III.A.2. Agricultural Indicators

        There is no complete measure of pesticide usage by states that is readily available.  So, a variety
of factors  were considered to assess potential synthetic organic chemical pollution from agriculture in
each state. These included the percent of the state's population that is classified as rural, the percent of
land in the state that is crop land, the percent of land that is grassland pasture and rangeland (a possible
inverse  indicator), and total farm agricultural chemical expenses. Like the manufacturing factors, these
agricultural variables were considered in terms  of their value in indicating potential sources of pollution
and were plotted against one another to determine how closely they are related.

        Of these factors, total farm agricultural chemical expenses was considered to be the best, and
most direct indicator of potential pollution.  The percent of the state's population that lives in rural areas
does not necessarily relate to agricultural chemical use or crop land.  There is, of course, a correlation
between crop land and agricultural chemical use, but there are notable exceptions such as Florida and
California which use a large amount of agricultural chemicals despite having more limited crop land area.
While there are some incomplete surveys of pesticide use, the Census of Agriculture (1992) measure of
dollars spent on agricultural chemicals is a more consistent and complete measure nationally.
                                                 20

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
III.B.  Representative Cross-Section of States

        Table III.B. 1 summarizes the pollution potential rankings for the 50 states, highlighting those
included in URCIS.  Although a total of 38 state data sets, as well as data for Washington D.C. and
Virgin Islands, are included in URCIS Round 1 data, not all states were usable in constructing a
"representative" cross-section, as discussed in Section II. Thirteen states contained only detections or too
few analytical records, or records from too few PWSs and were eliminated from consideration because
of their inherent bias. The data from Washington, D.C. and Virgin Islands were excluded from this state-
level analysis because it was difficult to evaluate them in relation to complete state data, for the current
purposes. (The number of data from these entities is few and they can easily be added in for later
review.) The data quality screening left 25 states eligible for the national cross-section. As noted in
Section II, New York was also excluded because of inherent data quality problems, leaving 24 states.

        The group of 24 cross-section states (the states with the best data quality) were evaluated for
their pollution potential rankings and geographic coverage. Figure III.B. 1. summarizes the
representativeness of the pollution potential distribution across the ranking quartiles of the 24 cross-section
states.  As illustrated, the 24 states are quite well distributed based on pollution potential indicators, with a
uniform distribution from high to low potential for both key pollution indicators. Figure III.B.2 shows the
geographic distribution of the 24 cross-section states, as well as the states not in the cross section.
Spatially the  24 states cover a substantial portion of the country.  While coverage is lacking from the
south-central U.S. and New England, the cross-section states provide broad coverage from around the
country, from the major climatic regions. The 24 states include about 49% of the PWSs nationally and
about 56% of population served by PWSs.

Table III.B.1.  Ranking of States based on Number of Manufacturing Establishments per Square Mile.
URCIS (Round 1) 24-State Cross-Section in Bold.
State
Rhode Island
New Jersey
Connecticut
Massachusetts
Mew York
Ohio
Maryland
Pennsylvania
Delaware
Illinois
California
Florida
Michigan
Mew Hampshire
Indiana
North Carolina
Wisconsin
Tennessee
Georgia
Virginia
South Carolina
Hawaii
Vermont
Washington
Ranking of the Number of
Manufacturing Establishments/ Sq.
Mile
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Ranking of the Total Farm Ag.
Chemical Expenses
49
37
45
43
28
11
35
29
39
2
1
4
18
48
7
17
20
24
19
30
32
36
47
14
                                                 21

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                    EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
State
Alabama
Missouri
Kentucky
Minnesota
Louisiana
Texas
Mississippi
Arkansas
West Virginia
Oregon
Maine
Iowa
Oklahoma
Colorado
Kansas
Arizona
Utah
Nebraska
Idaho
New Mexico
South Dakota
Mevada
North Dakota
Montana
Wyoming
Alaska

Ranking of the Number of
Manufacturing Establishments/ Sq.
Mile
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
l=hiehest
Ranking of the Total Farm Ag.
Chemical Expenses
26
12
27
5
13
6
8
10
44
22
38
3
33
31
16
25
42
9
23
40
21
46
15
34
41
50
l=hiehest
All 50 states are ranked based on the number of manufacturing establishments per square mile.  Each state's rank in total farm
agricultural chemical expenses is also indicated.  The 38 states in highlighted rows are the states with data in the URCIS (Round 1)
database. The 24 states in bold are the selected URCIS (Round 1) cross-section states. Ranking quartiles are indicated by bold lines.
                                                             22

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          EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Figure III.B.1.  Distribution of State Rankings for Manufacturing Establishments / Sq. Mile
                            vs. Farm Ag. Chemical Expenses.
                 Highlighting URCIS (Round 1) 24 Cross-Section States
                      nji of the No. ot'MajiuficniriJUs EitablUlw.ents' Sq. MiL?
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                 EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Figure III.B.2. 24 URCIS (Round 1) Representative Cross-Section States and States Not Included in
the Cross-Section
                                          URCIS (Round 1)
                                                               URCIS (Round 1) States
                                                               I   I States not in Cross-Section (no data)
                                                               I   I States with biased data
                                                               I   I 24 Cross-Section States
                                                                   (data used in report)
        In sum, the group of 24 cross-section states in URCIS (Round 1), should provide a balanced
representation, based on relative rankings for pollution potential (i.e., potential for contaminant
occurrence), geographic coverage, and data quality and completeness.  The 24 cross-section state
distribution across pollution potential quartiles suggests that the states should provide a valid indication of
the potential range and occurrence of contamination in PWSs nationally. The data from the 24-state
cross-section is  used to compute aggregate contaminant occurrence measures as an approximation of a
national cross-section.  While the data from these cross-section states cannot be stated to be "statistically
representative,"  their distribution should provide a representative view and clear indication of national
central tendency of occurrence.

        In addition, the URCIS data, with 24 states in its cross-section,  represent a relatively large
collection of state data for a cross-section.  As noted, the CMR analysis developed  a cross-section of 8
states. (The Round 2 unregulated data cross-section, discussed later in this section, has 20 states used for
analyses.)  The  data from the URCIS 24 cross-section states can also be used to evaluate and illustrate
this approach to constructing a national cross section by evaluating the data in aggregate steps, using
increments of the 24  states.  This  is described below.
                                                  24

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
III.B.1.  Incremental National Cross-Sections

       The data from the 24 URCIS cross-section states were used to build "incremental" national
cross-sections, by aggregating subsets of the 24 states using the same, described selection protocol for
evaluating representativeness.  Each aggregation (e.g., 4 states, 8 states, etc.) provides some
representation from all quartiles of pollution potential indicators, a geographic balance, and, hence,
hopefully, a balance in potential occurrence. The data from the states in each aggregate were used to
compute group contaminant occurrence measures as an approximation of a national cross-section.

       The CMR analysis suggested that a minimum of 6 or 7 states was needed to provide a balance
both geographically and across  pollution potentials. The CMR report used 8 states out of the available
data.  (Unfortunately, the same 8 states could not be used in this analysis because data were not available
for all of them.  The 8-state cross-section here in the incremental build-up, though, is a close
approximation to the 8 states used in the CMR.) For this comparison, the first cross-section is composed
of 4 states, and additional states are added in increments.  Hence, the first group of 4 states (NJ, GA, IA,
and MT) is composed of one state from each quartile, with the states covering a broad geographic range.
Additional states were  added, maintaining the distribution of pollution potential and spatial diversity, to
develop composite 8-  and 13-state cross-sections. The statistical data from these aggregates can be
compared with the results from the 24 states, the 16 states/territories with the biased data, and the  results
of all 40  states/territories, to evaluate and illustrate the differences.

       The states included in each cross-section increment or group are:

       4 States:       NJ, GA, I A, MT

       8 States:       NJ, GA, I A, MT,  CA, NC, KY, NM

       13 States:      NJ, GA, I A, MT,  CA, NC, KY, NM, OH, TN, AL,  SD, AZ

       24 States:      NJ, GA, I A, MT,  CA, NC, KY, NM, OH, TN, AL, SD, AZ, AK, FL, HI, IL, IN,
                      MD, MN, UT,WA,WV,WY

       14 (biased) States: AR, CO, DE, LA, MA, MI, MO, MS, NE, NH, NV,
                      NY,  TX, VT (plus DC  and VI)

       All (40) States: NJ, GA, IA, MT,  CA, NC, KY, NM, OH, TN, AL, SD, AZ, AK, FL, HI,
                      IL, IN, MD, MN, UT, WA, WV, WY, AR, CO, DC, DE, LA, MA, MI,
                      MO, MS, NE, NH, NV, NY, TX, VI, VT

       Figure III.B.1.a shows the pollution potential ranking distribution of the first 8 states and the last
16 states used in the 24-state cross-section, for comparison. Table III.B. l.a, summarizes occurrence
results from the various state groups  for 5  of the Round 1 contaminants: a relatively high-occurrence
VOC, trichloroethylene (TCE); a very high occurrence VOC that occurs from pollutant sources and as a
THM-chlorination by-product, chloroform; and  three more typical, low occurrence VOCs, bromobenzene,
hexachlorobutadiene, and 1,3-dichloropropene.
                                               25

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             EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Figure IILB.l.a.  Distribution of State Rankings for Manufacturing Establishments / Sq. Mile vs.
                                Farm Ag. Chemical Expenses.
                       URCIS (Round 1) 24-State Cross-Section Build-up
                          nji of the No. ot'MajiuficniriJUs EitablUlw.ents' Sq. MiL?
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                                              26

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Table IILB.l.a.  Summary and Comparison of Occurrence Results for Incremental National
Cross-Sections in URCIS (Round 1).
STATES
TOTAL #
SAMPLES
TOTAL
UNIQUE
PWS
% SAMPLES
>MRL
% PWS >
MRL
%
POPULATION
>MRL
% PWS
>HRL
MEDIAN
DETECTS
(Mg/L)
BROMOBENZENE
4 STATES
8 STATES
13 STATES
24 STATES
14 STATES/ BIASED1
ALL (40) STATES
8,443
14,059
34,597
56,174
3,457
59,631
4,038
5,599
9,630
16,450
488
16,938
0.02%
0.06%
0.05%
0.07%
0.23%
0.08%
0.02%
0.13%
0.15%
0.19%
1.64%
0.24%
0.03%
2.21%
2.69%
3.17%
0.84%
3.07%
N/A
N/A
N/A
N/A
N/A
N/A
1.85
3.65
1.48
1.00
1.00
1.00
CHLOROFORM
4 STATES
8 STATES
13 STATES
24 STATES
14 STATES/ BIASED1
ALL (40) STATES
9,538
28,757
40,392
63,826
4,919
68,745
4,245
9,303
12,717
20,184
1,038
21,222
31.10%
27.17%
25.74%
28.38%
66.62%
31.11%
30.67%
23.59%
24.74%
28.63%
77.75%
31.03%
82.81%
76.36%
77.24%
79.17%
95.09%
81.04%
0.05%
0.03%
0.02%
0.02%
0.00%
0.02%
5.40
3.00
4.00
4.80
6.40
5.00
1,3-DICHLOROPROPENE
4 STATES
8 STATES
13 STATES
24 STATES
14 STATES/ BIASED1
ALL (40) STATES
4,157
8,390
24,733
31,104
869
31,973
2,220
3,366
6,667
9,164
143
9,307
0.07%
0.04%
0.02%
0.06%
1.04%
0.09%
0.14%
0.09%
0.09%
0.16%
2.80%
0.20%
3.65%
1.26%
0.73%
0.91%
3.28%
0.95%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1.30
1.30
1.15
1.00
2.00
1.00
HEXACHLOROBUTADIENE
4 STATES
8 STATES
13 STATES
24 STATES
14 STATES/ BIASED1
ALL (40) STATES
1,630
7,950
27,020
42,839
2,710
45,549
801
2,797
6,669
12,284
484
12,768
0.37%
0.08%
0.08%
0.13%
0.11%
0.13%
0.75%
0.21%
0.28%
0.35%
0.62%
0.36%
0.56%
0.06%
0.67%
0.86%
0.06%
0.82%
0.25%
0.07%
0.12%
0.11%
0.62%
0.13%
0.12
0.12
0.83
0.25
6.00
0.30
TRICHLOROETHYLENE
4 STATES
8 STATES
13 STATES
24 STATES
14 STATES/ BIASED1
ALL (40) STATES
4,235
28,464
38,274
53,674
4,713
58,387
2,402
7,346
10,135
15,290
628
15,918
4.53%
22.83%
17.82%
13.80%
28.37%
14.97%
3.04%
4.61%
3.93%
3.54%
24.84%
4.38%
0.43%
63.49%
59.39%
55.49%
34.73%
55.00%
0.87%
1.51%
1.30%
0.99%
9.08%
1.31%
1.85
3.10
3.10
3.00
3.00
3.00
    14 States plus DC, VI
                                                27

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
        The comparative results illustrate several points. The representative cross-section results for the
percentage of systems (or percentage of samples, or percentage of population served by systems) with
detections are quite stable and consistent for the 8-, 13- and 24-state cross-sections. The 4 state data are
generally more variable, and more obviously different from the larger cross-sections. Sometimes the 4
state values are greater, sometimes smaller than the 8-, 13-, and 24-state values. For the 8-, 13-, and 24-
state data, the values for the percent samples and the percent population vary more than the percent
systems, as would be expected.

        The values for the percent samples  or systems with detections are always greater for the 16
biased-states, typically much greater than the cross-section states, i.e., 25% of PWS with detections of
TCE compared to 4% for the national cross-section. (The  one exception is for the percent of
hexachlorobutadiene samples with detections.) The percent population using drinking water with
detections is not always greater for the 16 biased-states, but this is in part because the population data are
so incomplete for these states. Because the 16 biased-states have such a strong bias of increased
occurrence, occurrence results using all 40 states are typically greater than the national cross-section, as
well.

        The 8-state through the 24-state cross-sections provide comparable results.  The results are
consistent and all appear usable in providing a national cross-section that can enable an estimate of
contaminant occurrence. Obviously, having data from more states is desirable,  as long as the additional
states are added in a balanced manner relating to pollution potential and spatial  coverage.  Table III.B. l.b
shows the results for TCE with 3 other comparisons.  Results from 5 high-occurrence states (i.e., all in
the top quartile for manufacturing density), 5 low-occurrence (all lowest quartile) and a regionally-biased
sample (4 Midwestern states) are shown for comparison.  These comparative data further support the
selection approach and illustrate the value of establishing the national cross-section. While more data is
desirable, it is evident that having an appropriately selected 8 state sample is more representative than the
wrong 16 states.  The validity and value of the national cross-section sample could be further tested if
necessary.

Table III.B.l.b.  Trichloroethylene Occurrence for the URCIS (Round 1) Cross-Section States and
Comparative Biased Groups of States
STATES
TOTAL #
SAMPLES
TOTAL
UNIQUE
PWS
% SAMPLES
>MRL
% PWS
>MRL
%
POPULATION
>MRL
% PWS
>MCL
MEDIAN
DETECTS
(MS'L)
TRICHLOROETHYLENE
4 STATES
8 STATES
13 STATES
24 STATES
14 STATES/
ALL (40) STATES
HIGHOCC.2
LOWOCC.3
REGIONAL OCC.4
4,235
28,464
38,274
53,674
4,713
58,387
28,227
5,952
9,107
2,402
7,346
10,135
15,290
628
15,918
7,304
1,974
2,085
4.53%
22.83%
17.82%
13.80%
28.37%
14.97%
23.25%
0.66%
6.25%
3.04%
4.61%
3.93%
3.54%
24.84%
4.38%
4.12%
0.96%
2.69%
0.43%
63.49%
59.39%
55.49%
34.73%
55.00%
63.84%
1.00%
24.14%
0.87%
1.51%
1.30%
0.99%
9.08%
1.31%
1.45%
0.30%
1.06%
1.85
3.10
3.10
3.00
3.00
3.00
3.10
1.90
1.40
1. 14 States plus DC, VI
2.. High Occurrence States: CA, IL, MD, NJ, OH
3. Low Occurrence States: AZ, MT, NM, SD, UT
4. Regional Occurrence States: I A, IL, IN, OH
                                                 28

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
        The consistency of analytical results among the different national cross-section groups supports
the validity of the criteria used to construct the state aggregations.  Again, while the data from these
cross-section states cannot be stated to be "statistically representative," their distribution should provide a
clear indication of national central tendency of occurrence.  The results using the 24-state cross-section
will be further described in later sections of this report.

III.B.2. SDWIS/FED 20-State Cross-Section

        After the checking and editing process of the SDWIS/FED (Round 2) data, a group of 20 states -
with the exceptions noted in Section II.B.3 - remained for which the data were relatively unbiased,
complete, and of good quality.  These 20 SDWIS/FED Round 2 cross-section states were then  evaluated
for their pollution potential rankings and geographic coverage.  The pollution potential ranking of all states
(with these 20 cross-section states identified in bold) are presented in Table III.B.2.a.  In Figure III.B.2.a,
the distribution of the pollution potential rankings of the 20 cross-section states illustrates how
representative the cross-section states are as based on these characteristics.

Table III.B.l.a.  Ranking of States based on Number of Manufacturing Establishments per Square Mile.
SDWIS/FED (Round 2) 20 Cross-Section States in Bold.
State
Rhode Island
New Jersey
Connecticut
Massachusetts
New York
Ohio
Maryland
Pennsylvania
Delaware
Illinois
California
Florida
Michigan
New Hampshire
Indiana
North Carolina
Wisconsin
Tennessee
Georgia
Virginia
South Carolina
Hawaii
Vermont
Washington
Alabama
Missouri
Kentucky
Minnesota
Louisiana
Texas
Mississippi
Arkansas
West Virginia
Ranking of the Number of
Manufacturing Establishments/ Sq.
Mile
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
Ranking of the Total Farm Ag.
Chemical Expenses
49
37
45
43
28
11
35
29
39
2
1
4
18
48
7
17
20
24
19
30
32
36
47
14
26
12
27
5
13
6
8
10
44
                                                 29

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                    EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
State
Oregon
Maine
Iowa
Oklahoma
Colorado
Kansas
Arizona
Utah
Nebraska
Idaho
New Mexico
South Dakota
Nevada
North Dakota
Montana
Wyoming
Alaska

Ranking of the Number of
Manufacturing Establishments/ Sq.
Mile
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
1 =highest
Ranking of the Total Farm Ag.
Chemical Expenses
22
38
3
33
31
16
25
42
9
23
40
21
46
15
34
41
50
1 =highest
All 50 states are ranked based on the number of manufacturing establishments per square mile. Each state's rank in total farm
agricultural chemical expenses is also indicated. The 34 states in highlighted rows are the states with data in the SDWIS/FED database.
The 20 states in bold are the selected SDWIS/FED (Round 2) cross-section states. Ranking quartiles are indicated by bold lines.
                                                            30

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           EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Figure III.B.l.a.  Distribution of State Rankings for Manufacturing Establishments / Sq. Mile
                             vs. Farm Ag. Chemical Expenses.
                Highlighting SDWIS/FED (Round 2) 20 Cross-Section States
                   Ranking of the No. ot'Mamiiacttirinp, EitabMiir.e]its>' Sq. Mil?
          U.1VV

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                                            31

-------
                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
        The geographic distribution of the 20 SDWIS/FED Round 2 cross-section states, as well as the
states not included in the cross-section, is shown in Figure III.B.2.b. Even with some cluster of states in
the central  portion of the quartiles, the 20 cross-section states appear relatively well distributed based on
pollution potential indicators, with a fairly uniform distribution, from high to low potential, for both key
pollution indicators (see Figure III.B.2.a).  This broad distribution appears relatively comparable to that of
the 24 URCIS Round 1 cross-section states (see the discussion earlier in this section of the Round 1
cross-section).  Geographically, the 20 Round 2 cross-section states are widely distributed across the
country.  Although coverage is perhaps sparse in the south-east and along the western slope of the Rocky
Mountains, every major geographic region has some state representation.

        The data used for the analyses in this report (including the URCIS-Round 1 and SDWIS/FED-
Round 2 cross-section states) is available upon request from the EPA Office of Ground Water and
Drinking Water.
Figure III.B.l.b.  20 SDWIS/FED (Round 2) Cross-Section States and States Not Included in the
Cross-Section
                                        SDWIS/FED (Round 2)
                                                              SDWIS/FED (Round 2) States
                                                              I   I States not in Cross-Section (no data)
                                                              I   I States with biased data
                                                              I   I 20 Cross-Section States
                                                                  (data used in report)
                                                 32

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
IV.    DATA COVERAGE FOR THE NATIONAL OCCURRENCE OF CONTAMINANTS
       IN DRINKING WATER

IVA.  URCIS (Round 1) Data Coverage

       A descriptive overview of the data is presented in a series of tables to provide additional insight
and perspective on the results.  After data management and editing, 3.45 million records were available
for analysis representing over 24,000 PWSs from the 40 states/entities. For the 24 states comprising the
URCIS representative cross-section (see Section III for a discussion regarding cross-section), the
analytical results total is 3.27 million records from 22,034 PWSs.  The URCIS cross-section states,
therefore, contain nearly 95% of all Round 1 state contaminant occurrence data in URCIS. Summary
results for all states, as well as for the 24 cross-section states, are included in the following tables.
Additionally, several figures (such as Figures VI.B.I.a and VI.B.2.a) present occurrence findings based
on data from all states with any data in URCIS, even including the non-cross-section states.  Although
these non-cross-section states contain biased data (for example, some non-cross-section states contain
analytical records primarily from PWSs with analytical detections), these states can still provide
information regarding a broad overview of the presence (or absence) of contaminant detections in PWSs.
(By including these "biased states" in some figures, an inadvertent under-assessment of the extent of
detections nationally is avoided.)

       Table IV.A.I shows data elements included in URCIS  (Round 1).  Note that a special data
element was developed in URCIS  to indicate a detection from a result below the detection limit.  (Many
states do  not provide an actual value for the detection limit, or  MRL, and often these values are recorded
as a zero  in the analytical result field.)

Table IV.A.1.  Data Elements Included in the URCIS (Round 1) Database
Data Element
PWS Identification Number
Source Identification Number
Source Water Type


Ground Water
Surface Water
Chemical Abstract Services (CAS) Number
Contaminant Name
Contaminant Group



SOC
VOC
Y
Sample Date
Analysis Result
Detection Limit Identifier


0
1
Description
Nine digit identification number unique to each public water system
Three-digit code to identify the source

Ground water or purchased ground water
Surface water, purchased surface water, ground water under the direct influence of
surface water or purchased ground water under the direct influence of surface water
Unique numeric designation used to identify specific chemical compounds
Commonly used contaminant name

Synthetic Organic Chemicals
Volatile Organic Chemicals
Trihalomethanes
Date sample was collected (years 1983 through 1992)
Concentration of the sample (measured in micrograms/liter)
Code to determine if analysis result is less than the minimum detection limit or
greater than the minimum detection limit
Analytical result concentration is less than the minimum detection limit
Analytical result concentration is greater than the minimum detection limit
                                                33

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               EPA - OGWDW  Occurrence of Unregulated Contaminants in Public Water Systems
Data Element
Community Type
CWS
NTNC
NC
Population Served
Description

Community Water System
Non-Transient Non-Community Water
System
Non-Community Water System
Population served by the public water system
       Included in Table IV.A.2 are the number and percent of sample records and systems related to
source water type: 87% of the systems are classified as ground water and 13% as using surface water.
The Round 1 data were collected before "ground water under the direct influence of surface water"
(GUDI) was introduced as a source definition. The classification used follows the regulatory guidelines:  if
a system uses any surface water, the system is classified, and is required to monitor, as a surface water
system.

Table IV.A.2. URCIS (Round 1) Data - Number of Records and Systems by Source Water Type
SOURCE TYPE
Total - Ground Water
Total - Surface Water
TOT4L
Cross-Section - Ground Water
Cross-Section - Surface Water
Cross-Section - TOTAL
RECORDS
NUMBER
2,950,618
501,912
3,452,530
2,814,472
453,173
3,267,645
PERCENT
85.5%
14.5%
100.0%
86.1%
13.9%
100.0%
SYSTEMS
NUMBER
21,046
3,130
24,176
19,637
2,695
22,332
PERCENT
87.1%
12.9%
100.0%
87.9%
12.1%
100.0%
Note: There are a greater number of "Total" and "24 States Total" systems here than in Table IV.A.3 since some water systems have
more than one source water type.

        Table IV.A.3. shows the number and percent of records and systems by system type. About 7%
of systems were coded as "NCWS", a SDWIS code typically used for transient systems. Transient
PWSs were not required by federal rule to monitor, but may have been required to by some states.  Also,
about 7% of the systems did not indicate a system type (and the type could not be determined by merging
the data sets with the SDWIS inventory records).  These data remained in the database for the first
stages of analysis, because other data elements were complete.

Table IV.A.3. URCIS  (Round 1) Data - Number of Records and Systems by System Type
SYSTEM TYPE
Total - CWS1
Total - NCWS2
Total - NTNCWS3
Total - UNKNOWN
TOTAL
RECORDS
NUMBER
2,608,840
89,707
516,047
237,936
3,452,530
PERCENT
75.6%
2.6%
14.9%
6.9%
100.0%
SYSTEMS
NUMBER
15,562
1,771
4,872
1,614
23,819
PERCENT
65.3%
7.4%
20.5%
6.8%
100.0%
                                               34

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
SYSTEM TYPE
Cross-Section - CWS1
Cross-Section - NCWS2
Cross-Section - NTNCWS3
Cross-Section - UNKNOWN
Cross-Section - TOTAL
RECORDS
NUMBER
2,546,144
89,533
515,807
116,161
3,267,645
PERCENT
77.9%
2.7%
15.8%
3.6%
100.0%
SYSTEMS
NUMBER
14,260
1,746
4,774
1,254
22,034
PERCENT
64.7%
7.9%
21.7%
5.7%
100.0%
1. CWS = Community Water System
2. NCWS = Non-Community (Transient) Water System
3. NTNCWS = Non-Transient Non-Community Water System
Note: There are a fewer number of "Total" and "24 States Total" systems here than in Table IV.A.2 since some water systems have
more than one source water type.
        Tables IV. A.4 and IV.A.5 show the distribution of data by years and by month across all years.
The majority of data were collected during the 1987-1992  compliance cycle, with a peak of data collection
in 1991. (Records prior to 1987 predate the formal beginning of first round monitoring, but represent
comparable data, and are therefore included to expand the coverage of these analyses.)  Although in the
month of March there is a slightly greater percentage of data, there is no significant difference, suggesting
that there should be no seasonal bias due to monthly differences in reporting.

Table IV.A.4. URCIS (Round 1) Data - Number of Records by Year and Source Water Type
YEAR
Total - 1983
Total - 1984
Total - 1985
Total - 1986
Total - 1987
Total - 1988
Total - 1989
Total - 1990
Total - 1991
Total - 1992
TOTAL
Cross-Section - 1983
Cross-Section - 1984
Cross-Section - 1985
Cross-Section - 1986
Cross-Section - 1987
Cross-Section - 1988
# SURFACE
WATER
RECORDS
260
150
233
1,939
12,942
119,367
131,030
101,945
108,681
25,365
501,912
0
30
175
1,852
12,876
107,428
# GROUND
WATER
RECORDS
553
44,305
78,994
140,620
120,728
232,471
382,077
574,609
1,179,423
196,838
2,950,618
5
43,837
78,696
140,155
120,292
214,190
TOTAL #
RECORDS
813
44,455
79,227
142,559
133,670
351,838
513,107
676,554
1,288,104
222,203
3,452,530
5
43,867
78,871
142,007
133,168
321,618
% OF TOTAL
RECORDS
0.0%
1.3%
2.3%
4.1%
3.9%
10.2%
14.9%
19.6%
37.3%
6.4%
100.0%
0.0%
1.3%
2.4%
4.3%
4.1%
9.8%
                                                  35

-------
               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
YEAR
Cross-Section - 1989
Cross-Section - 1990
Cross-Section - 1991
Cross-Section - 1992
Cross-Section -
# SURFACE
WATER
RECORDS
111,979
87,273
106,338
25,222
453,173
# GROUND
WATER
RECORDS
337,068
509,889
1,174,459
195,881
2,814,472
TOTAL #
RECORDS
449,047
597,162
1,280,797
221,103
3,267,645
% OF TOT4L
RECORDS
13.7%
18.3%
39.2%
6.8%
100.0%
Table IV.A.5. URCIS (Round 1) Data - Number of Records by Month and Source Water Type
MONTH
Total - January
Total - February
Total - March
Total - April
Total - May
Total - June
Total - July
Total - August
Total - September
Total - October
Total - November
Total - December
TOTAL
Cross-Section - January
Cross-Section - February
Cross-Section - March
Cross-Section - April
Cross-Section - May
Cross-Section - June
Cross-Section - July
Cross-Section - August
Cross-Section -
Cross-Section - October
Cross-Section -
Cross-Section-December
Cross-Section -
# SURFACE
WATER
RECORDS
35,587
47,287
50,360
35,705
49,007
44,784
33,777
43,397
38,699
38,267
41,990
43,052
501,912
33,315
42,774
42,903
33,625
45,221
38,140
31,060
40,967
33,214
35,756
39,480
36,718
453,173
# GROUND
WATER
RECORDS
276,606
267,434
345,113
272,149
267,254
207,553
197,418
196,703
223,775
232,324
225,235
239,054
2,950,618
266,685
259,528
328,589
262,270
254,900
190,791
190,254
185,958
209,679
222,984
215,372
227,462
2,814,472
TOTAL # OF
RECORDS
312,193
314,721
395,473
307,854
316,261
252,337
231,195
240,100
262,474
270,591
267,225
282,106
3,452,530
300,000
302,302
371,492
295,895
300,121
228,931
221,314
226,925
242,893
258,740
254,852
264,180
3,267,645
% OF TOTAL
RECORDS
9.0%
9.1%
11.5%
8.9%
9.2%
7.3%
6.7%
7.0%
7.6%
7.8%
7.7%
8.2%
100.0%
9.2%
9.3%
11.4%
9.1%
9.2%
7.0%
6.8%
6.9%
7.4%
7.9%
7.8%
8.1%
100.0%
                                              36

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
       Table IV.A.6 summarizes the number of systems by population-served size categories. Table
IV.A.7 provides further details by system type.  Note that the majority of New York and Alaska systems
cannot be associated with a population-served because the population data were not reported, and for the
URCIS data, these states used state-specific PWSIDs that cannot be related to other databases. (We
were not able, for example, to derive population estimates for systems through merging the URCIS data
with New York or Alaska state data in SDWIS because of the lack of common PWSIDs.)  Also, while
California has a large number of systems without population data (540), this only constitutes about 13% of
the systems represented in their data.

       The analytical findings of the occurrence data for the 62 contaminants from the 24 URCIS Round
1 cross-section states are developed and summarized in Section V of this report.
                                               37

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                  EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Table IV.A.6.  Total Number of Public Water Systems by State and Population Size Category contained in the URCIS (Round 1) Database

STATE
Alaska
Alabama
Arkansas
Arizona
Calitornia
Colorado
Washmgton,D.C.
Delaware
Florida
Georgia
Hawaii
Iowa
Illinois
Indiana
Kentucky
Louisiana
Massachusetts
Maryland
Michigan
Minnesota
Missouri
Mississippi
Montana
North Carolina
Nebraska
New Hampshire
New Jersey
New Mexico
Nevada
New York
Ohio
South Dakota
Tennessee
lexas
Utah
Virgin Islands
Vermont
Washington
West Virginia
Wvom ing
TOTAL

CKOSS-SEC1 1OIN
<500
Systems
54
33
1
665
2,520
37
1
0
434
788
51
549
624
146
267
1
12
720
52
1,131
1
62
470
177
1 1 /
125
1.210
453
0
1
1,852
225
65
26
253
0
83
5/4
15
89
13,884

13,365
Pop. Served
1,914
7,009
200
102,991
31 /,235
5.204
0
0
72.950
117,453
11, 4//
106.710
122,394
25,846
47,385
400
1,555
106,915
8,803
128,066
25
16,421
64,429
29,818
24,264
18,040
142.718
66,407
0
380
289,842
36,254
11,205
6,449
47,854
0
13,443
118,291
2.337
19.296
2,091,980

1,996,796
501-3,300
Systems
0
27
3
218
559
9
0
2
193
231
40
356
459
160
117
1
25
201
47
315
6
92
69
62
73
47
223
116
0
5
555
S3
85
49
95
1
35
266
81
35
4,941

4,546
Pop. Served
0
55.027
3.735
270,754
782,402
13.047
0
2,434
281.349
310,920
61,169
432.396
586,283
222,855
182,427
3,300
58,716
228,018
74,381
422,736
18,503
134,099
92,750
104,598
87,124
67,207
265.866
142,048
0
7.000
675,965
102,550
128,990
69,308
142,188
2.000
53,217
381,713
131.115
49.438
6,647,628

6,053,557
3,301-10,000
Systems
0
4
2
50
21 1
2
0
6
88
84
22
69
135
61
76
6
60
49
17
61
50
29
19
33
14
13
54
26
7
1
120
16
85
26
41
0
9
72
28
3
1,696

1,454
Pop. Served
0
240.441
11.928
271,132
1,349,634
13.600
0
32,198
525.826
473,277
127,092
400.312
768.046
346,289
453,476
33,705
394,623
256,062
100,965
341,983
296,997
166,067
104,176
202,185
78,871
77,742
335.843
168,031
43,850
3.500
713,602
81,2/2
539,009
135,427
253,727
0
53,070
430,502
156.505
77.875
10,058,840

8,616,297
10,001-50,000
Systems
0
41
0
30
212
8
0
2
100
46
11
20
76
39
61
3
97
22
17
54
24
22
5
23
8
14
50
19
1
1
102
9
59
13
29
2
5
5 7
13
6
1,301

1,084
Pop. Served
0
784.624
0
663,184
5,498,165
162.546
0
60,300
2.393.159
1,056,758
240,632
444.462
1,551.040
856,829
1,239,827
65,310
2,281,386
494,978
382,481
1,264,645
382,805
551,708
146,666
493,108
176,145
261,331
1.167.427
450,299
27,060
17.000
2,149,959
134,818
1,314,876
231,413
656,592
64.000
105,300
1,338,993
300.335
16.923
29,527,084

24,758,299
>50,000
Systems
0
10
0
10
125
4
0
3
38
16
3
8
13
9
4
2
16
6
6
2
3
1
2
3
2
2
14
3
2
0
26
2
12
10
12
0
1
9
2
2
383

331
Pop. Served
0
1.705.098
0
2,705,523
20,801,367
1.680.200
0
404,800
6.326.159
2,967,369
820,233
744.541
4.215.097
1,660,931
1,224,025
137,400
3,060,031
3,765,001
1,634,269
146,335
191,700
205,895
141,151
283,900
580,341
184,750
3.572.618
545,179
1,000,000
0
4,916,684
155,814
1,921,707
2,317,678
2,017,135
0
56,000
1,531,541
238.577
109.000
73,968,049

62,514,985
SYSTEMS
WITH POP
DATA
54
152
6
973
3,627
60
1
13
853
1,165
127
1.002
1.307
415
525
13
210
998
139
1.563
84
206
565
298
214
201
1.551
617
10
8
2,655
335
306
124
430
3
133
9/8
139
145
22,205

20,780
SYSTEMS
WITH NO
POP DATA1
694
0
0
0
540
0
0
0
2
0
0
0
0
0
0
0
10
0
0
2
1
0
0
0
0
0
0
0
0
349
2
0
0
0
0
0
0
14
0
0
1,614

1,254
TOTAL
Systems
748
152
6
973
4,16/
60
1
13
855
1,165
12/
1.002
1.307
415
525
13
220
998
139
1.565
85
206
565
298
214
201
1.551
617
10
357
2,657
335
306
124
430
3
133
992
139
45
23,819

22,034
Pop. Served
1,914
2.792.199
15.863
4,013,584
2S,/4S,S03
1.874.597
0
499, /32
9.599.443
4,925,777
1,260,603
2.128.421
7.242,860
3,112,750
3,147,140
240,115
5,796,311
4,850,974
2,200,899
2,303,765
890,030
1,0/4,190
549,172
1,113,609
946,745
609,070
5.484.472
1,371,964
1,0/0,910
27.880
8,746,052
510, /OS
3,915,787
2,760,2/5
3,117,496
66.000
281,030
3,801,040
828.869
372.532
122,293,581

103,939,934
1.  A total of 1,614 systems in the UCM (1987) database do not contain population-served information. Population-served information was also not available for those systems in the
1999 Needs Survey (Cadmus, 1998), and therefore, the population size categories could not be determined for these systems.
Note: The total number of systems is different from the totals in Table IV.A.2 since some systems have more than one source type.
                                                                           38

-------
                  EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Table IV.A.7.  Number of Public Water Systems by State, System Type and Population Size Category contained in the URCIS (Round 1) Database

STATE


Alฃ
Ala
ska
bam a
Arkansas
Arizona
Jalitornia
Ho
orado
Washington,D.C.
Delaware
7 orida
Georgia
Hawaii
Iowa
Illinois
nc
lana
Kentucky
Louisiana
vlassachusetts
vlaryland
Michigan
vlinnesota
vlissouri
vlississippi
vlontana
N orth Carolina
Nebraska
^ew Hampshire
New Jersey
^ew Mexico
Nevada
New York
3h
10
South Dakota
lennessee
Texas
Utฃ
h
Virgin Islands
Vermont
IVa
shmgton
West Virginia
Wyoming
TOTAL
UKOSS-SEC T1ON


Pooulation Size Cal esorv (Population Served by System}
<500
TOTAL

54
33
1
665
2,520
37
1

434
788
51
549
624
146
267
1
12
720
52
1.131
1
62
470
177
117
125
1,210
453

1
1,852
225
65
26
253

83
574
15
89
13,884
13,365
System Tyf
CWS1
9
12


387
1,491
28
1

384
644
41
439
624
51
101
1
6
323
51
444
1
53
324
168
91
90
123
355

1
703
197
24
21
181

72
558
13
79
8,092
7,675
NTNCW
2
21

133
321
8


8
133
7
94

89
160

3
388

582

9
114
9
21
29
800
95


971
25
35
4
54

4
6
2
8
4,145
4,067
e
NCWS

43


145
70S





32
11
3
16

6
6

3
9
1
105


32

5
6
287
3


178
3
6
1
18

7
10

2
1,647
1,623
501-3,300
™^T| System lype
^^^ [H\raa IUIIUHYJ IHMUKH

27
3
218
559
9

2
193
231
40
356
459
160
117
1
25
201
4 /
315
6
92
69
62
73
47
223
116

5
555
83
85
49
95
1
35
266
81
35
4,941
4,546

20
3
169
422
8

2
87
205
35
338
459
152
91
1
24
109
46
295
6
86
63
62
71
45
69
95

5
354
82
75
46
90
1
32
264
79
34
4,125
3,749

/

40
70
1


4
25
3
16

8
25

1
92
1
19

6
6

2
2
145
21


183
1
10
3

5
3
2
2
1
704
685



9
67



2
1
2
2


1




1






9



18









112
112
3,301-10,000
T/-VT.T 1 System Type
^^^ itaatm icmciHVj ICIHVKU

41
2
50
21 1
2

6
88
84
22
69
135
61
76
6
60
49
1 /
61
50
29
19
33
14
13
54
26
7
1
120
16
85
26
41

9
72
28
13
1696
1454

41
2
47
196
2

6
88
83
22
69
135
61
76
6
60
48
16
60
50
28
19
33
14
13
52
26
7
1
117
15
85
26
41

9
72
28
13
1667
1427



3
/




1







1

1

1




2



2









18
17




8













1











1
1








11
10
10,001-50,000
TOTAL


41

30
212
8

2
100
46
11
20
/6
39
61
3
97
22
1 /
54
24
22
5
23
8
14
50
19
1
1
102
9
59
13
29
2
5
57
13
6
1,301
1,084
System lype
CWS1

41

30
208
8

2
100
46
11
20
/6
39
61
3
97
22
1 /
54
24
22
5
23
8
14
50
19
1
1
102
9
59
13
28
2
5
57
13
6
1,296
1,079
VTNCW




4





























1





5
5
> 50,000
TOTAL


10

10
125
4

3
38
16
3
8
13
9
4
2
16
6
6
2
3
1
2
3
2
2
14
3
2

26
2
12
10
12

1
9
2
2
383
331
System Type
CWS1

10

10
124
4

3
38
16
3
8
13
9
4
2
16
6
6
2
3
1
2
3
2
2
14
3
2

26
2
12
10
12

1
9
2
2
382
330
NCWS3




1



































1
1
SYSTEMS
WITH
POP

54
152
6
973
3,627
60
1
13
853
1,165
127
1,002
1,301
415
525
13
210
998
139
1.563
84
206
565
298
214
201
1,551
617
10
8
2,655
335
306
124
430
3
133
978
139
145
22,205
20,780
SYSTEMS
WITH NO
POP

694



540



2







10


2
1








349
2






14


1,614
1,254
TOTAL
PWSs

748
152
6
973
4,167
60
1
13
855
1,165
127
1,002
1,301
415
525
13
220
998
139
1.565
85
206
565
298
214
201
1,551
617
10
357
2,657
335
306
124
430
3
133
992
139
145
23,819
22,034
1. CWS= Community Water System
2. NTNCWS= Non-Transient Non-Community Water System
3. NCWS= Non-Community Water System-Transients
4. A total of 1,614 systems in the URCIS (Round 1) database do not contain population data and, therefore, the population size categories could not be determined for these systems.
                                                                          39

-------
                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
IV.B.  SDWIS/FED (Round 2) Data Coverage

       A descriptive overview of the Round 2 data is presented in a series of tables to provide additional
insight and perspective on the results. Table IV.B.l shows data elements included in SDWIS/FED for
the Round 2 UCM (1993) list contaminants, and Tables IV.B.2 to IV.B.7 characterize the data as based
on number of records, number of systems, source water type, system type, records by year and month,
and system size (population-served).  As noted, after the initial data management and editing, 4.21 million
records were available for analysis from over 33,000 PWSs in the  35 states/entities.  The 20 SDWIS/FED
Round 2 state cross-section totals 3.69 million records from slightly more than 27,000 PWSs.  The Round
2 cross-section states, therefore, contain nearly 88% of all Round 2 state contaminant occurrence data in
SDWIS/FED.  Summary results for all states, as well as the 20 cross-section states, are included in the
following tables.  Additionally, several figures (such as Figures VI.BAa and VLB.5.a) present
occurrence findings based on data from all states with any data in SDWIS/FED, even including the non-
cross-section states.  Although these non-cross-section states contain biased data (for example, some
non-cross-section states contain analytical records primarily from PWSs with  analytical detections), these
states can still provide information regarding a broad overview of the presence (or absence) of
contaminant detections in PWSs. (By including these "biased states" in some figures, an inadvertent
under-assessment of the extent of detections nationally is avoided.)

Table IV.B.l. Data Elements Included in the SDWIS/FED (Round 2) Database
Data Element
PWS Identification Number
Source Identification Number
Source Water Type


Ground water
Surface water
Chemical Abstract Services (CAS) Number
Contaminant Name
Contaminant Group



IOC
SOC
VOC
Sample Date
Analysis Result
Detection Limit Identifier


0
1
Community Type



cws
NTNC
NC
Population Served
Description
^Jine digit identification number unique to each public water system
Three-digit code to identify the source

Ground water or purchased ground water
Surface water, purchased surface water, ground water under the direct influence of
Jnique numeric designation used to identify specific chemical compounds
Commonly used contaminant name

Inorganic Chemicals
Synthetic Organic Chemicals
Volatile Organic Chemicals
Date sample was collected (years 1992 through 1997)
Concentration of the sample (measured in micrograms/liter)
Code to determine if analysis result is less than the minimum detection limit or
Analytical result concentration is less than the minimum detection limit
Analytical result concentration is greater than the minimum detection limit

Community Water System
^on-Transient Non-Community Water System
^on-Community
Population served by the public water system
                                               40

-------
                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
       Table IV. B. 2 shows the number and percent of sample records and systems according to source
water type: approximately 89% of the systems in the 20-state cross-section are classified as ground water
and 11% as using surface water.  These source water percentages are essentially the same for the entire
data set for all 35 states/entities. These SDWIS/FED (Round 2) data contained systems using "ground
water under the direct influence of surface water" (GUDI) as a source definition. The classification used
follows the regulatory guidelines: if a system uses any surface water (such as a GUDI), it is classified as
a surface water system.

Table IV.B.2.  SDWIS/FED (Round 2) Data - Number of Records and Systems by Source Water Type
SOURCE TYPE
Total - Ground Water
Total - Surface Water
TOT4L
Cross-Section - Ground Water
Cross-Section - Surface Water
Cross-Section - TOTAL
RECORDS
NUMBER
3,479,102
732,344
4,211,446
3,085,266
609,619
3,694,885
PERCENT
82.6%
17.4%
100.0%
83.5%
16.5%
100.0%
SYSTEMS
NUMBER
30,085
3,763
33,848
24,199
2,909
27,108
PERCENT
88.9%
11.1%
100.0%
89.3%
10.7%
100.0%
Note: There are a greater number of "Total" and "24 States Total" systems here than in Table VLB.3 since some water systems have
more than one source water type.

        Table IV. B. 3 shows the number and percent of records and systems by system type.
Approximately seventy percent of systems in the 20-state cross-section were coded as a "CWS"
(Community Water System) and 30% were coded as "NTNC" (Non-Transient Non-Community Water
System). The  CWS percent was slightly higher for the entire 35 states/entities data set, and the percent
for NTNC correspondingly lower.  As discussed earlier in Section  II.B.l, systems coded as "NC" (Non-
Community Water System) were excluded from these analyses.

Table IV.B.3. SDWIS/FED (Round 2) Data - Number of Records and Systems by System Type
SYSTEM TYPE
CWS1
NTNCWS2
TOTAL
Cross-Section - CWS1
Cross-Section - NTNCWS2
Cross-Section - TOTAL
RECORDS
NUMBER
3,255,222
956,224
4,211,446
2,808,341
886,544
3,694,885
PERCENT
77.3%
22.7%
100.0%
76.0%
24.0%
100.0%
SYSTEMS
NUMBER
24,357
9,491
33,848
19,055
8,053
27,108
PERCENT
72.0%
28.0%
100.0%
70.3%
29.7%
100.0%
1. CWS = Community Water System
2. NTNCWS = Non-Transient Non-Community Water System
Note: There are a greater number of "Total" and "24 States Total" systems here than in Table IV.B.2 since some water systems have
more than one source water type.
                                               41

-------
                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
       Tables IV.B.4 and IV.B.5 show the distribution of data by years and by month (based on actual
sample collection or analysis date). The upper half of each table is for the entire 35 states/entities data
set while the lower half is for the 20-state cross-section data. Table IV.B.4  indicates the amount of data
annually collected during the 1992-1997 compliance cycle, with a peak of data collection in 1995. And in
Table IV.B.5, a fairly uniform distribution of occurrence data by month is shown, suggesting that there
should be no inherent seasonal bias in the data.

Table IV.B.4. SDWIS/FED (Round 2) Data - Number of Records by Year and Source Water Type
YEAR
Total - 1992
Total- 1993
Total - 1994
Total- 1995
Total - 1996
Total- 1997
TOTAL
Cross-Section - 1992
Cross-Section - 1993
Cross-Section - 1994
Cross-Section - 1995
Cross-Section - 1996
Cross-Section - 1997
Cross-Section - TOTAL
#
SURFACE
WATER
39,487
130,993
130,127
144,006
157,152
130,579
732,344
33,187
115,859
105,673
112,144
136,182
106,574
609,619
# GROUND
WATER
RECORDS
243,426
622,010
586,066
816,442
647,717
563,441
3,479,102
187,558
592,555
504,410
711,443
589,788
499,512
3,085,266
TOTAL # OF
RECORDS
282,913
753,003
716,193
960,448
804,869
694,020
4,211,446
220,745
708,414
610,083
823,587
725,970
606,086
3,694,885
% OF TOTAL
RECORDS
6.7%
17.9%
17.0%
22.8%
19.1%
16.5%
100.0%
6.0%
19.2%
16.5%
22.3%
19.6%
16.4%
100.0%
                                                42

-------
                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Table IV.B.5.  SDWIS/FED (Round 2) Data - Number of Records by Month and Source Water Type
MONTH
Total - January
Total - February
Total - March
Total - April
Total - May
Total - June
Total - July
Total - August
Total - September
Total - October
Total - November
Total - December
TOTAL
Cross-Section - January
Cross-Section - February
Cross-Section - March
Cross-Section - April
Cross-Section - May
Cross-Section - June
Cross-Section - July
Cross-Section - August
Cross-Section -
Cross-Section - October
Cross-Section -
Cross-Section -
Cross-Section -
# SURFACE
WATER
RECORDS
49,458
60,065
75,004
51,874
58,348
66,500
55,382
65,326
75,206
55,215
55,251
64,715
732,344
40,939
49,405
65,525
41,692
44,374
55,612
44,174
52,087
65,814
46,113
46,492
57,392
609.619
# GROUND
WATER
RECORDS
254,507
248,888
343,572
284,793
275,219
316,326
296,042
302,726
328,634
289,789
241,581
297,025
3,479,102
221,420
211,499
305,597
257,085
245,051
285,159
262,611
266,475
293,692
254,688
213,295
268,694
3.085.266
TOTAL # OF
RECORDS
303,965
308,953
418,576
336,667
333,567
382,826
351,424
368,052
403,840
345,004
296,832
361,740
4,211,446
262,359
260,904
371,122
298,777
289,425
340,771
306,785
318,562
359,506
300,801
259,787
326,086
3.694.885
% OF TOTAL
RECORDS
7.2%
7.3%
9.9%
8.0%
7.9%
9.1%
8.3%
8.7%
9.6%
8.2%
7.0%
8.6%
100.0%
7.1%
7.1%
10.0%
8.1%
7.8%
9.2%
8.3%
8.6%
9.7%
8.1%
7.0%
8.8%
100.0%
       Table IV.B.6 summarizes the number of systems by population-served size categories and Table
IV.B.7 provides a more detailed, population and system-type stratification of the number of PWSs by
state.  Population-served information is available for essentially all systems. Eight systems are listed as
having a population-served equal to "0", but these constitute only about 0.02% of the total systems
represented (and the omission of these system records have insignificant affect on aggregate analyses).

       The analytical findings of the occurrence data for the 48 contaminants from the 20 SDWIS/FED
Round 2 cross-section states are developed and summarized in Section V of this report.
                                               43

-------
                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Table IV.B.6.  Total Number of Public Water Systems by State and Population Size Category contained in the SDWIS/FED (Round 2)  Database
State

Alaska
Alabama
Arkansas
Arizona
California
Co orado
Connecticut
Indiana
Kentucky
.ouisiana
Massachusetts
Maryland
Maine
Michigan
Minnesota
Missouri
Mississippi
North Carolina
North Dakota
New Hampshire
New Jersey
New Mexico
Ohio
Oklahom a
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
n:tes
Texas
Vermont
Washington
Wisconsin
TOTAL
CROSS-SECTION
<500
Systems
516
232
245
102
5
600
4
77
304
944
280
780
714
10,098
1,144
959
399
1,747
190
726
13
575
1,882
529
941
649
99
805
13
10
9
3,904
514
2,694
82
32,785
28,927
Pop. Served
82,449
13,520
49,621
13,779
1,252
87.645
702
12,026
36,175
32.904
36,200
116,705
79,877
368,683
143,991
145,609
87,494
254,268
30,785
85,760
1,530
88,107
236,040
84,271
128,271
117,468
11,267
93,828
1,585
2,102
2.680
455,733
73,516
269,080
14.931
3,359,854
2,790,537
501-3,300
Systems
88
128
230
33
7
179
34
22
110
425
88
210
118
659
361
377
639
384
90
101
4
135
543
300
180
541
13
183
9
27
3
1,458
94
410
122
8,315
6,034
1. A total of 10 systems in the URCIS (Round 1) data
1999 Needs Survey (Cadmus, 1998), and therefore, the
Mote: The total number of systems is different from t
Pop. Served
89,197
199,444
325,237
38,611
14,288
243.936
56,708
29,566
181,895
642.165
114,886
237,585
150,203
611,150
469,447
510,668
870,441
477,007
123,068
111,804
6,700
164,972
648,312
425,444
264,102
726,644
16,051
250,076
14,042
45,058
23.663
2,043,889
122,789
493,377
59.230
10,901,655
7,702,230
3,301-10,000
Systems
16
80
72
7
11
34
18
18
75
32
67
31
19
90
61
95
112
94
7
15
0
25
127
67
34
140
6
53
5
23
5
404
23
89
16
2,071
1,428
Pop. Served
99,948
452,530
413,469
47,595
65,908
207.337
124,968
100,284
444,806
745.184
435,505
167,560
105,646
477,254
342,925
541,291
586,717
537,119
42,024
87,062
0
154,164
795,018
391,360
205,788
828,059
28,418
322,170
24,504
131,093
29.563
2 191 545
130,636
502,421
86.342
11,846,213
8,170,660
10,001-50,000
Systems
5
45
24
7
20
33
22
9
55
49
92
21
12
50
56
34
38
76
8
11
1
17
111
33
36
98
9
40
1
15
0
165
7
80
19
1,299
928
Pop. Served
93,565
946,697
395,956
151,900
586,871
664.762
601,981
210,465
1,126,179
908.659
2,252,879
480,423
226,155
1,026,615
1,174,498
653,463
814,699
1,551,578
208,201
212,831
20,000
386,299
2,310,695
722,050
741,645
2,184,747
269,020
891,882
17,592
279,173
0
3,428,011
133,820
1,839,251
371.826
27,884,388
19,764,076
>50,000
Systems
1
6
6
3
25
13
9
2
5
15
16
7
1
16
12
7
1
17
1
2
0
3
28
8
6
29
3
8
0
3
0
44
1
14
8
320
210
Pop. Served
114,909
1,314,000
500,810
656,523
3,801,723
2.373.200
1,548,582
170,318
1,278,206
2.233.197
2,990,361
4,019,601
113,560
2,194,717
1,532,855
972,276
205,895
2,281,321
74,111
208,000
0
572,900
5,233,485
1,460,880
949,930
5,932,445
435,551
1,074,883
0
335,205
0
10,054,831
56,000
1,983,113
.209.416
57,882,804
39,344,617
TOTAL
WITH POP
DATA
626
491
577
152
68
859
87
128
549
1.565
543
1,049
864
10,913
1,634
1,472
1,189
2,318
296
855
18
755
2,691
937
1,197
1,457
130
1,089
28
78
27
5,975
639
3,287
247
44,790
37,527
SYSTEMS
WITH NO
POPDATA1


1








2









1






1


5



10
9
TOTAL
Systems
626
491
578
152
68
859
87
128
549
.565
543
1,051
864
10,913
1,634
1,472
1,189
2,318
296
855
18
756
2,691
937
1,197
1,457
130
1,089
29
78
27
5,980
639
3,287
247
44,800
37,536
Pop. Served
480,068
2,926,191
1,685,093
908,408
4,470,042
3.576.880
2,332,941
522,659
3,067,261
4.662.109
5,829,831
5,021,874
675,441
4,678,419
3,663,716
2,823,307
2,565,246
5,101,293
478,189
705,457
28,230
1,366,442
9,223,550
3,084,005
2,289,736
9,789,363
760,307
2,632,839
57,723
792,631
55.906
18,174,009
516,761
5,087,242
1.841.745
111,874,914
77,772,120
base do not contain population-served information. Population-served information was also not available for those systems in the
population size categories could not be determined for these systems.
le totals in Table IV.B.2 since some systems have more than one source type.
                                                                    44

-------
                  EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Table IV.B.7.  Number of Public Water Systems by State,  System Type and Population Size Category contained in the SDWIS/FED (Round 2) Database


STATE
Alaska
Alabama
Arkansas
Arizona
Jalitornia
Colorado
Connecticut
Indiana
Kentucky
^ouisiana
Vlassachusetts
vlaryland
vlaine
vlichigan
Minnesota
Vlissouri
vlississippi
North Carolina
North Dakota
New Hampshire
New Jersey
New Mexico
Ohio
Jklahoma
Oregon
Pennsylvania
^.hode Island
South Carolina
South Dakota
lennessee
Tribes
Texas
Vermont
Washington
Wisconsin
TOTAL

CKOSS-SEC1 1OIN
Population Size Category (Popu ation Served by System)
<5UU
TOTAL
515
59
244
76
4
580
4
69
203
781
247
745
599
2,551
1,093
923
367
1,693
190
/20
12
574
1,487
480
912
619
86
764
11
10
8
2.843
512
2.130
62
22,173

18,815
System Type
CWS1
515
23
172
56
4
465
4
21
95
627
132
340
271
845
452
726
306
1,245
147
436

443
597
334
596
388
39
467
11
10
8
2.138
313
1.849
51
14,126

11,837
IN TIN CWS'

36
72
20

115

48
108
154
115
405
328
1,706
641
197
61
448
43
284
12
131
890
146
316
231
47
297



705
199
281
11
8,047

6,978
501 -3,3UU
TOTAL

88
124
230
30
/
173
34
22
107
419
84
209
114
515
359
375
638
383
90
101
4
135
506
300
180
539
13
182
9
2/
13
1.407
93
371
120
8,001

5,740
System Type
CWS1
88
107
221
25
7
159
34
17
89
372
48
106
87
335
307
332
589
269
89
5/

109
358
294
153
3/2
6
131
9
21
13
.265
80
320
120
6,595

4,692
IN TIN CWS'

17
9
5

14

5
18
47
36
103
27
180
52
43
49
114
1
44
4
26
148
6
27
16/
7
51



42
13
51

1,406

1,048
3,301 - 10,000
TOTAL

16
80
72
7
1 1
34
18
18
75
130
67
31
19
82
61
95
111
94
7
15
0
25
127
67
34
139
6
53
5
23
5
401
23
86
16
2,053

1,414
System Type
CWS1
16
80
70
6
1 1
32
18
18
75
130
67
30
9
79
60
94
109
93
7
15

25
125
66
34
136
5
51
5
23
5
395
23
85
16
2,023

1,392
IN TIN CWS'


2
1

2





1

3
1
1
2
1




2
1

3
1
2



6

1

30

22
10,001 - 50,000
TOTAL

5
45
24
7
20
33
22
9
55
49
92
21
12
49
56
34
38
76
8
1 1
1
17
111
33
36
98
9
40
1
15
0
165
7
79
19
1,297

926
System Type
CWS1
5
45
24
7
19
32
22
9
55
49
92
21
12
48
56
34
37
76
8
11
1
17
111
33
36
98
9
39
1
15

164
7
79
19
1,291

923
IN TIN CWS'




1
1







1


1










1







6

3
> 50,000
TOTAL

1
6
6
3
25
13
9
2
5
15
16
7
1
12
12
7
1
17
1
2
0
3
28
8
6
29
3
8
0
3
0
44
1
14
8
316

206
System Type
CWS1
1
6
6
3
25
13
9
2
5
15
16
7
1
11
12
7
1
17
1
2

3
28
8
6
29
3
8

3

44
1
14
8
315

205
IN TIN CWS'













1





















1

1
SYSTEMS
WITH
POP
DATA3
625
314
576
123
67
833
87
120
445
1,394
506
1,013
745
3,209
1,581
1,434
1,155
2,263
296
849
17
754
2,259
888
1,168
1,424
117
1,047
26
/S
26
4.860
636
2.680
225
33,840

27,101
SYSTEMS
WITH
NO POP
DATA4


1








2









1






1


3



8

7
TOTAL
SYSTEMS
625
314
577
123
67
833
87
120
445
1,394
506
1,015
745
3,209
1,581
1,434
1,155
2,263
296
849
17
755
2,259
888
1,168
1,424
117
1,047
27
/S
26
4.863
636
2.680
225
33,848

27,108
1. CWS= Community Water System
2.  NTNCWS= Non-Transient Non-Community Water System
3.  The values in this column indicate the number of PWSs that have population-served information.  Although some PWS records contained no population served information, the
missing population-served values were acquired from the more complete population records of the 1999 Needs Survey, (Cadmus, 1998).
4.  This column indicates the number of PWSs for which no population-served information is contained in SDWIS/FED or the 1999 Needs Survey (Cadmus, 1998), and therefore
population size categories for these systems could not be determined.
                                                                             45

-------
               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
IV.C.  Comparison of Data Coverage of URCIS (Round 1) and SDWIS/FED (Round 2)

       The URCIS (Round 1) and SDWIS/FED (Round 2) data were evaluated to determine if
comparable states,  public water systems, and contaminants are contained in both databases. As
previously noted, URCIS contained data from 40 states/territories and SDWIS/FED contained data from
35 states/territories.

       Table IV.C.l lists the states in URCIS (Round 1) and SDWIS/FED (Round 2), highlighting the
states common to both.  Although 25 states are common to both Rounds 1 and 2, most of these states
could not be considered for this analysis because of data quality issues (see Table II. A. l.a and Table
II.B.l.a). Many states reported analytical results from a very low proportion of systems, reported results
in mixed units, and/or reported only analytical detections (highly censored reporting) in Round 1 and/or
Round 2.

       Of the 25 states in both URCIS (Round 1) and SDWIS/FED (Round 2) (highlighted in Table
IV.C.l), only 8 were determined to be sufficiently complete for use in this comparison analysis. Alaska,
Kentucky, Maryland, Minnesota, North Carolina, New Mexico, Ohio, and Washington (in bold in Table
IV.C.l) were contained in both databases and have data of adequate quality for analyses and
comparisons.

Table IV.C.l. States Common to both URCIS (Round 1) and SDWIS/FED (Round 2)
States/ Tribes/
Territories
Alaska
Alabama
Arkansas
American Samoa
Arizona
California
Colorado
Connecticut
Washington, D.C.
Delaware
Florida
Georgia
Guam
Hawaii
Iowa
Idaho
Illinois
Indiana
Kansas
Kentucky
Louisiana
Massachusetts
Maryland
Maine
Michigan
Minnesota
URCIS (Round 1)
24 Cross-
Section States
(used in
comparison)
•
•


•
•




•
•

•
•

•
•

.


•


•
16 Other
States
(not used in
comparison)


•



•

•
•










•
•


•

SDWIS/FED (Round 2)
20 Cross-
Section States
(used in
comparison)
•

•



•












.

•
•
•
•
•
15 Other
States
(not used in
comparison)

•


•
•

•









•


•





                                              46

-------
                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
States/ Tribes/
Territories
Missouri
Marianna Islands
Mississippi
Montana
North Carolina
North Dakota
Nebraska
New Hampshire
New Jersey
New Mexico
Nevada
New York
Ohio
Oklahoma
Oregon
Pennsylvania
Puerto Rico
Rhode Island
South Carolina
South Dakota
Tennessee
Tribes
Texas
Utah
Virginia
Virgin Islands
Vermont
Washington
Wisconsin
West Virginia
Wyoming
States in Both
Round 1 and Round
URCIS (Round 1)
24 Cross-
Section States
(used in
comparison)



•
•



•
•


•






•
•


•



•

•
•
15
16 Other
States
(not used in
comparison)
•

•



•
•


•
•










•


•
•




10
SDWIS/FED (Round 2)
20 Cross-
Section States
(used in
comparison)
•



•
•

•

•


•
•
•


•




•




•



15
15 Other
States
(not used in
comparison)


•





•






•


•
•
•
•




•

•


10
          Highlighted states are common to both URCIS (Round 1) and SDWIS/FED (Round2).
          • - States with data of adequate quality, used for comparison.
          • - States with poor or incomplete data, not used for comparison.
          Bold states have data of adequate quality in both URCIS (Round 1) and SDWIS/FED (Round2) for comparison

        In addition to the states that have data in both URCIS and SDWIS/FED databases, a
determination was made regarding actual PWSs that are common to both databases. Table IV.C.2
illustrates the small percentage of systems common to both Round 1 and Round 2. Thirty-one percent of
all PWSs in Round 1 are also  in Round 2, while only 22% of all Round 2 PWSs are common to both
rounds.  This is, in part, because there are many more systems reporting analytical results in  Round 2 than
in Round 1.

        Michigan, for example, has only 139 systems in Round 1, and 123 of those systems (88%) are
also in Round 2.  In Round 2, Michigan has a total of 3,209 systems.  Of these Round 2 systems, only 123
(approximately 4%)  are in Round  1. The number of PWSs in Alaska are problematic because the
PWSIDs from Round 1  do not match the PWSIDs in Round 2.  A few states do have a higher
                                                47

-------
               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
percentage of systems common to both rounds.  Kentucky, Maryland, Minnesota, New Mexico, and Ohio
each have over 70% of their total number of systems common to both Round 1 and Round 2.
Coincidently, these are five of the states used for the comparison of occurrence data in states common in
Round 1 and Round 2, which makes this analysis more representative for comparison of the states for
select contaminants.
Table IV.C.2. URCIS (Round 1) and SDWIS/FED (Round 2) - Reporting Data in Comparison of Public
Water Systems
States/ Tribes/
Territories
Alaska
Alabama
Arkansas
American Samoa
Arizona
California
Colorado
Connecticut
Washington, D.C.
Delaware
Florida
Georgia
Guam
Hawaii
Iowa
Idaho
Illinois
Indiana
Kansas
Kentucky
Louisiana
Massachusetts
Maryland
Maine
Michigan
Minnesota
Missouri
Marianna Islands
Mississippi
Montana
"-Jorth Carolina
North Dakota
Nebraska
"-Jew Hampshire
"-Jew Jersey
"-Jew Mexico
Nevada
"-Jew York
Number of
Duplicate PWSs
0
55
6
0
123
67
54
0
0
0
0
0
0
0
0
0
0
120
0
395
13
165
820
0
123
1,305
81
0
177
202
0
0
0
144
16
538
0
0
Number of PWSs
in URCIS
(Round 1)
748
152
6
0
973
4,167
60
0
1
13
855
1,165
0
127
1,002
0
1,307
415
0
525
13
220
998
0
139
1,565
85
0
206
565
298
0
214
201
1,551
617
10
357
% URCIS (Round 1)
PWSs in
SDWIS/FED
(Round 2)
0%
36%
100%
0%
13%
2%
90%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
29%
0%
75%
100%
75%
82%
0%
88%
83%
95%
0%
86%
0%
0%
0%
0%
72%
1%
87%
0%
0%
Number of
PWSs in
SDWIS/FED
(Round 2)
625
314
577
0
123
67
833
87
0
0
0
0
0
0
0
0
0
120
0
445
1,394
506
1,015
745
3,209
1,581
1,434
0
1,155
0
2,263
296
0
849
17
755
0
0
% SDWIS/FED
(Round 2) PWSs
in URCIS
(Round 1)
0%
18%
1%
0%
100%
100%
6%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
100%
0%
89%
1%
33%
81%
0%
4%
83%
6%
0%
15%
0%
0%
0%
0%
17%
94%
71%
0%
0%

-------
               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
States/ Tribes/
Territories
Ohio
Oklahoma
Oregon
Pennsylvania
Puerto Rico
Rhode Island
South Carolina
South Dakota
Tennessee
Tribes
Texas
Utah
Virginia
Virgin Islands
Vermont
Washington
Wisconsin
West Virginia
Wyoming
TOT4L
Number of
Duplicate PWSs
1,880
0
0
0
0
0
0
25
50
0
116
0
0
0
113
878
0
0
0
7,466
Number of PWSs
in URCIS
(Round 1)
2,657
0
0
0
0
0
0
335
306
0
124
430
0
3
133
992
0
139
145
23,819
% URCIS (Round 1)
PWSs in
SDWIS/FED
(Round 2)
71%
0%
0%
0%
0%
0%
0%
7%
16%
0%
94%
0%
0%
0%
85%
89%
0%
0%
0%
31%
Number of
PWSs in
SDWIS/FED
(Round 2)
2,259
888
1,168
1,424
0
117
1,047
27
78
26
4,863
0
0
0
636
2,680
225
0
0
33,848
% SDWIS/FED
(Round 2) PWSs
in URCIS
(Round 1)
83%
0%
0%
0%
0%
0%
0%
93%
64%
0%
2%
0%
0%
0%
18%
33%
0%
0%
0%
22%
       Comparisons of contaminants in Round 1 and Round 2 indicated that there were no common
lOCs (Group 1) or SOCs (Regulated or Group 2) reported in both databases.  In contrast, all of the
unregulated Group 3 and Group 4 VOCs reported in Round 2 were also reported in Round 1.  None of the
regulated VOCs reported in Round 1, however, were reported in Round 2.  (The contaminants are listed
in Table I.B.I and I.B.2.) Note that these comparisons serve only to highlight the  degree of overlap (or
lack of overlap) between the Round 1 and Round 2 data.  (Representative balance across pollution
potential indicators or geography likely does not remain in these 8 states and small number of PWSs
common to both Rounds  1 and 2).

       The tables in Appendix  C contain similar summary data as those contained in Appendices A and
B. The total number of analytical records from Round 1 to Round 2 generally increased for all 8 states
and all contaminants, with the exception of Kentucky. The number of total unique PWSs increased from
Round 1 to Round 2 for North Carolina, New Mexico, and Washington, while the number of PWSs
decreased from Round 1 to Round 2 in Alaska, Kentucky, Maryland, and Ohio for most of the 11
contaminants.  The number of PWSs in Minnesota remained consistent from Round 1 and Round 2.

       Changes in the percentages of samples and percentage of PWSs with at least one analytical
result greater than the MRL followed no consistent pattern, either by contaminant or by state.  The
percentage of PWSs with at least one analytical result exceeding the concentration of the HRL (or 1A
HRL) also followed no apparent or consist pattern between Round  1 and Round 2.

IV.D.  Comparison of Data Coverage Across Systems Types and Sizes

       Data for select contaminants were also evaluated based on system type and system size.  Both
the URCIS (Round 1) and SDWIS/FED (Round 2) data are summarized according to system type
(community  water systems and non-transient non-community water systems) and  further stratified  by
system size (based on the five standard population-served categories). The summary data for these
                                              49

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               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
comparisons are presented in Appendix D (Tables D1-D14 for results from URCIS (Round 1) and Tables
D15-D33 for results from SDWIS/FED (Round 2)).  These stratified occurrence findings allow an
evaluation of any system size patterns and also provide an indication of population exposure.

       Generally, for both Round 1 and 2 data, the percentage of public water systems with analytical
results greater than the MRL and the HRL increases as the system size (population-served) increases.
Also, it appears that the percentage of public water systems with analytical results greater than the MRL
and the HRL is  generally greater for community water systems than for non-transient non-community
water systems.  Note that there is a much greater number of CWSs than NTNCWSs in the database.
V.     ANALYSIS OF NATIONAL OCCURRENCE

       In this section of the report, general summaries of contaminant occurrence based on data from
URCIS (Round 1) and the SDWIS/FED (Round 2) are presented. For select high occurrence
contaminants, more detailed occurrence assessments are included in Section VI.  Generally, these results,
based on representative cross-sections, suggest national occurrence characteristics.  For example, since
the data used to generate the summary statistics in Table V.A.I, are from the URCIS (Round 1) 24-state
(representative) cross-section, the percentage results (such as "%PWSs >MRL" for a particular
contaminant) can be interpreted as what percent of PWSs nationally might be expected to have at least
one analytical result greater than the detection limit.  These summary statistics can provide broad
characterizations of the degree of occurrence (e.g., is a particular contaminant found in PWSs above the
MRL or above a higher reference threshold?) and relative levels of occurrence (e.g., is one contaminant
found above the MRL in a higher or lower percentage of PWSs when compared to another
contaminant?).  Although these occurrence assessments can enable preliminary conclusions about the
degree or relative levels of contaminant occurrence, the limitations of the underlying databases and cross-
sections do not enable  definitive conclusions regarding any geographic patterns of occurrence (this will be
briefly discussed below).

       To conduct these assessments, contaminant occurrence was evaluated relative to various
contaminant concentration thresholds, with thresholds chosen as reference points for analysis (e.g., %
PWSs > threshold, or  % PWSs > 1A threshold).  Whenever possible, contaminants were analyzed relative
to their Maximum Contaminant Level (MCL).  Four contaminants were analyzed relative to the Health
Advisory Levels (HALs) in place when the analyses were conducted for this report. Another group of
contaminants were analyzed relative to Health Reference Levels (HRLs), which were simply reference
levels established only for these preliminary  occurrence assessments. MCLs, HALs, and HRLs are used
only to facilitate the occurrence assessments  for this report.

       The summary  data developed for the occurrence assessments in this report are presented in detail
in Appendices A, B, C, and D. Appendix A contains summary tables for the 62 URCIS (Round 1)
contaminant data.  Appendix B contains summary tables for the 48 SDWIS/FED (Round 2) contaminant
data.  In Appendix C, data coverage comparisons between URCIS (Round 1) and  SDWIS/FED (Round
2) data are presented for select states and contaminants. Data summaries of select contaminants by
system type and population-served for both URCIS (Round 1) and SDWIS/FED (Round 2) data are
presented in Appendix D.
                                               50

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
V.A.   URCIS (Round 1) Contaminant Occurrence

       The development of URCIS (Round 1) 24 cross-section states are described in detail in Section
III of this report, and these 24 cross-section states are included in Figure III.B.2.  Table V.A. 1
summarizes the occurrence data of the URCIS (Round 1) 24-state cross-section for the 62 contaminants.
The table presents the total number of unique public water systems, the percent of public water systems
with at least one monitoring sample analytical result greater than the Minimum Reporting Level (MRL),
the percent of public water systems with at least one result greater than the estimated Health Reference
Level (HRL) and, finally, the 99th percentile value in micrograms per liter (• g/L).  More detailed
assessment of occurrence findings  will be presented in Section VI, but some general observations are
made here based on the findings presented in Table V. A. 1.

       The 24 states used in the URCIS (Round 1) cross-section reflect a significant national  coverage:
these states contain approximately 44% of public water systems nationally and 51% of the population
served  by public water systems.  For the majority of contaminants evaluated here, 35 out of 62, less than
1% of public water systems in the  cross-section states have analytical detections (any sample analytical
result greater than the MRL) (see Table V.A.I.). Another 16 contaminants are detected in 1 to 2% of
public water systems, as evidenced by  one or more sample analytical results greater than the MRL, and 7
contaminants are detected in 2 to 4% of public water systems,  as evidenced by one or more sample
analytical results greater than the MRL. Four contaminants -all THMs- have a considerably higher
percent of systems (ranging from 9.01% to 28.84%) with at least one sample analytical result greater than
the MRL.  THMs are known to have relatively high occurrence.  Other reports assess the occurrence of
the THMs specifically, therefore they are not selected as contaminants to be further assessed in this
report.  Select URCIS (Round 1) high occurrence contaminants are identified and assessed in more detail
in Section VI.

Table V.A.I. URCIS (Round 1) Data - 24-State Cross-Section Summary of Occurrence
CHEMICAL NAME
(Threshold in ug/L)
Total #
PWS
#GW
PWS
#SW
PWS
%
PWS
>MRL
% GW
PWS
>MRL
% sw
PWS
>MRL
% PWS >
Threshold
% GW
PWS>
Threshold
% SW
PWS>
Threshold
99%
Value
(MS/L)
SOCs
Dibrom ochloropropane
fMCL=0.2)
Ethylene Dibrom ide1
(MCL=0. 05J 	
12,827
11,450
11,446
10,274
1,511
1,284
2.49%
1.14%
2.51%
1.01%
2 32%
2.10%
1.32%
0.16%
1.35%
0.12%
0.99%
0.47%
1.03
0.01
VOCs
Benzene
(MCL=5)
Bromobenzene
(N/A)
Bromochlorom ethane
(MCL=10)
Bromodichlorom ethane
(HRL =60)
Bromoform
(HRL=400)
Bromom ethane
(MCL=10)
Carbon Tetrachloride
(MCL=5)
Chlorobenzene
(MCL=100)
Chloroethane
(N/A)
14,910
16,450
12,881
20,024
19,582
20,198
15,266
20,038
20,236
13,919
14,862
11,576
17,917
17,773
18,472
14,176
18,337
18,507
1,119
1,726
1,386
2,324
1,979
1,886
1,214
1,859
1,882
1.14%
0.19%
0.50%
22.09%
9.01%
0.77%
1.32%
0.53%
0.39%
1.11%
0.14%
0.44%
14.84%
7.56%
0.71%
1.09%
0.26%
0.29%
5.18%
0.64%
1.08%
79.69%
22.13%
1.22%
3.95%
3.17%
1.33%
0.25%
0.25%
0.27%
N/A
0.03%
0.13%
0.01%
0.09%
0.16%
0.00%
0.03%
0.04%
0.01%
0.08%
0.15%
0.00%
0.07%
0.86%
0.00%
0.16%
0.25%
0.00%
N/A
<2.0
<2.0
<1.0
22.00
7.32
<4.0
1.60
<1.0
<2.0
                                               51

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EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
CHEMICAL NAME
(Threshold in u.g/L)
Chloroform
(HRL=600)
Chlorom ethane
(MCL=3)
cis-l,2-Dichloroethene
(MCL=70)
cis-l,2-Dichloropropene
(N/A)
Dibromochlorom ethane
(HRL=60)
Dibromom ethane
(N/A)
Dichlorodifluorom ethane
(MCL=1,000)
1 , 1 -Dichloroe thane
(MCL=5)
1,2-Dichloroe thane
(MCL=5)
Dichloroethene
(MCL=7)
Dichloromethane
(MCL=5)
1 ,2-Dichloropropane
(MCL=5)
1 ,3-Dichloropropane
(N/A)
2,2-Dichloropropane
(N/A)
1 , 1 -Dichloropropene
(N/A)
1,3- Dichloropropene
(HRL=40)
Ethyl Benzene
(MCL=700)
Hexachlorobutadiene
(HRL=0.9)
Isopropylbenzene
(N/A)
m -Dichlorobenzene
(HAL=600)
m-Xylene
(N/A)
n-Butylbenzene
(N/A)
n-Propylbenzene
(N/A)
Naphthalene
(HRL=140)
o-Chlorotoluene
(MCL=100)
o-Dichlorobenzene
(MCL=600)
o-Xylene
(N/A)
p-Chlorotoluene
(MCL=100)
p-Dichlorobenzene
(MCL=750)
p-Isopropyltoluene
(N/A)
p-Xylene
(N/A)
sec-Butylbenzene
(N/A)
Total #
PWS
20,039
20,246
16,705
9,211
19,750
16,549
16,076
20,483
15,282
15,430
19,287
19,591
16,947
16,757
16,947
9,164
20,081
12,284
12,771
20,429
11,329
12,763
12,724
13,452
15,721
19,953
13,987
15,612
15,494
12,167
10,127
12,343
#GW
PWS
17,874
18,513
15,026
8,438
17,785
14,953
14,617
18,758
14,192
14,180
17,602
17,908
15,338
15,138
15,332
8,303
18,355
10,980
11,480
18,752
10,145
11,471
11,440
12,034
14,154
18,300
12,638
14,057
14,284
10,953
8,956
11,071
#SW
PWS
2,385
1,894
1,832
836
2,158
1,720
1,588
1,876
1,215
1,380
1,836
1,820
1,748
1,754
1,749
898
1,884
1,385
1,359
1,819
1,276
1,371
1,363
1,502
1,702
1,795
1,450
1,689
1,334
1,282
1,230
1,337
%
PWS
>MRL
28.84%
1.22%
1.47%
0.61%
18.01%
0.36%
1.37%
1.14%
1.16%
1.17%
4.05%
0.67%
0.12%
0.15%
0.13%
0.16%
1.62%
0.35%
0.27%
0.25%
1.55%
0.35%
0.33%
1.18%
0.20%
0.28%
1.76%
0.17%
1.25%
0.25%
1.58%
0.23%
% GW
PWS
>MRL
21.69%
1.11%
1.45%
0.52%
12.41%
0.21%
1.38%
1.09%
1.10%
1.06%
3.31%
0.66%
0.12%
0.14%
0.10%
0.12%
1.40%
0.30%
0.28%
0.20%
1.47%
0.29%
0.34%
1.08%
0.16%
0.20%
1.69%
0.15%
1.11%
0.26%
1.49%
0.23%
% sw
PWS
>MRL
84.40%
2.27%
1.53%
1.44%
64.55%
1.69%
1.39%
1.55%
1.73%
1.45%
11.06%
0.77%
0.11%
0.23%
0.40%
0.56%
3.66%
0.72%
0.22%
0.77%
2 12%
0.88%
0.22%
1.93%
0.53%
1.00%
2.41%
0.36%
2.70%
0.08%
2.36%
0.22%
% PWS >
Threshold
0.02%
0.45%
0.03%
% GW
PWS>
Threshold
0.01%
0.41%
0.03%
% SW
PWS>
Threshold
0.17%
0.84%
0.00%
N/A
0.06%
0.02%
0.32%
N/A
0.00%
0.18%
0.19%
0.20%
0.77%
0.08%
0.00%
0.16%
0.17%
0.20%
0.52%
0.09%
0.00%
0.37%
0.41%
0.22%
3.27%
0.00%
N/A
N/A
N/A
0.00%
0.00%
0.11%
0.00%
0.00%
0.06%
0.00%
0.00%
0.51%
N/A
0.00%
0.00%
0.00%
N/A
N/A
N/A
0.01%
0.00%
0.00%
0.02%
0.00%
0.00%
0.00%
0.00%
0.00%
N/A
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
N/A
N/A
N/A
99%
Value
(MS/L)
87.00
<4.0
2.18
<1.0
12.70
<2.0
0.50
0.10
<5.0
1.80
1.30
<4.0
<1.0
<2.0
<1.0
<1.0
<5.0
<5.0
<2.0
<5.0
<4.0
<2.0
<2.0
<5.0
<1.0
<5.0
<5.0
<1.0
<4.4
<2.0
<5.0
<2.0
                                     52

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                  EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
CHEMICAL NAME
(Threshold in u.g/L)
Styrene
(MCL=100)
tert-Butylbenzene
(N/A)
1,1,1,2- Tetrachloroethane
(HAL=70)
1 ,1 ,2,2-Tetrachloroethane
(HAL =2)
Tetrachloroethylene
(MCL=5)
Toluene
(MCL=100)
trans- 1,2-Dichloroethene
(MCL=100)
trans- 1,3-Dichloropropene
(N/A)
1 ,2,3-Trichlorobenzene
(N/A)
1 ,2,4-Trichlorobenzene
(MCL=70)
1,1,1 -Trichloroethane
(MCL=200)
1 , 1 ,2-Trichloroethane
(MCL=5)
Trichloroethylene
(MCL=5)
Trichlorofluorom ethane
(HAL=175)
1 ,2,3-Trichloropropane
(MCL=40)
1 ,2,4-Trim ethylbenzene
(N/A)
1, 3, 5-Trim ethylbenzene
(N/A)
Vinyl Chloride
(MCL=2)
Xylenes (Total)
(MCL=10,000)
Total #
PWS
16,623
12,353
16,956
20,407
19,814
20,089
19,945
9,883
12,876
13,449
15,279
19,964
15,290
16,851
17,392
12,755
12,671
15,184
9,463
#GW
PWS
14,938
11,081
15,338
18,693
18,298
18,364
18,267
9,017
11,567
11,996
14,191
18,253
14,198
15,347
15,771
11,462
11,379
14,099
8,841
#SW
PWS
1,832
1,337
1,753
1,867
1,652
1,887
1,825
959
1,389
1,539
1,213
1,853
1,220
1,637
1,758
1,372
1,370
1,209
670
%
PWS
>MRL
0.57%
0.19%
0.18%
0.45%
3.33%
3.50%
0.64%
0.25%
0.49%
0.49%
3.66%
0.43%
3.54%
1.48%
0.25%
0.83%
0.61%
0.50%
3.04%
% GW
PWS
>MRL
0.45%
0.19%
0.13%
0.39%
3.38%
3.10%
0.59%
0.13%
0.46%
0.45%
3.57%
0.29%
3.37%
1.39%
0.25%
0.76%
0.59%
0.44%
2.51%
% SW
PWS
>MRL
1.53%
0.22%
0.63%
1.02%
2.66%
7.31%
1.10%
1.36%
0.72%
0.78%
4.62%
1.78%
5.66%
2.32 /o
0.23%
1.38%
0.66%
1.24%
10.75%
% PWS >
Threshold
0.00%
% GW
PWS>
Threshold
0.00%
% SW
PWS>
Threshold
0.00%
N/A
0.00%
0.05%
0.91%
0.00%
0.01%
0.00%
0.05%
0.93%
0.00%
0.01%
0.00%
0.11%
0.67%
0.00%
0.00%
N/A
N/A
0.00%
0.03%
0.04%
0.98%
0.01%
0.01%
0.00%
0.03%
0.02%
1.00%
0.01%
0.01%
0.00%
0.00%
0.16%
0.66%
0.00%
0.00%
N/A
N/A
0.28%
0.00%
0.23%
0.00%
0.83%
0.00%
99%
Value
(MS/L)
<2.0
<2.0
<1.0
<1.0
13.2
0.7
<1.0
<1.0
<5.0
<5.0
3.7
<1.0
20.8
0.6
<2.0
<2.0
<2.0
<2.0
0.6
1 The high occurrence of Ethylene Dibromide are, in part, considered false positives related to analytical methods problems.

MCL=Maximum Contaminant Level
HAL=Health Advisory Level (as of December 2000)
HRL=Health Reference Level (concentration values used only as reference levels for analyses in this report)
MRL=Minimum Reporting Level

The MCL, HAL, HRL, and MRL values are used in this report only as reference levels to facilitate occurrence assessments.

"% PWS > Threshold" indicates the proportion of systems with any analytical results exceeding the concentration value of the
HRL/MCL/HAL. (Note that results for % PWSs greater than an MCL value does not indicate a MCL violation.  A formal MCL
violation occurs when the MCL is exceeded by the average of four consecutive quarterly samples or  confirmation samples as required
by the primacy States.)

N/A= There is no HRL/MCL/HAL available

        A complete presentation of the occurrence data for all 62 contaminants in URCIS (Round 1) is
provided in Appendix A.  There is a set of 3 tables of occurrence data for each of the 62 contaminants.
The first appendix table of each set (Tables A.l.a, A.2.a, A.3.a,  etc., through A.62.a) contains the
system-level summary data presented in Table V.A. 1 (above), but present the data for all individual  states
(rather than just the aggregated data from the 24 states in the cross-section included above in Table
V.A.I). Tables A.l.b through A.62.b provide sample-level data and additional  descriptive statistics,
including the total number of analyses and the percent of samples with at least  one result greater than the
                                                     53

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
MRL.  These tables also include the minimum concentration, 99th percentile value, maximum
concentration, minimum detection concentration and median detection concentration. Tables A.l.c
through A.62.C provide similar detailed analytical measures, but provide system-level statistics (as
compared to the sample-level statistics in Tables A.l.b through A.62.b).

V.B.    SDWIS/FED (Round 2) Contaminant Occurrence

        The SDWIS/FED (Round 2) 20 cross-section states were developed in Section III and are
identified in Figure III.B.2.b.  Table V.B.I summarizes the occurrence data of the SDWIS/FED (Round
2) 20 cross-section states for the 48 Round 2 contaminants. This table presents the total number  of
unique public water systems, the percent of public water systems with at least one result greater than the
Minimum Reporting Level (MRL), the percent of public water systems with at least one result greater
than the Health Reference Level (HRL) and, finally, the 99th percentile value in micrograms per liter
(• g/L).  Some general observations based on Table V.B.I are made here, with additional assessments of
occurrence  findings presented later in this section.

        The 20 states used in the  SDWIS/FED (Round 2) cross-section reflect a significant national
coverage: these states contain approximately 41% of public water systems nationally and 34% of the
population served by public water systems.  For a significant majority of the contaminants  evaluated here,
40 out of 48, less than 1% of public water systems in the cross-section states have analytical detections
(any sample analytical result greater than the MRL).  Two contaminants (dichlorodifluoromethane and
trichlorofluoromethane) are detected in 1 to 2% of public water systems, as evidenced by one or  more
sample analytical results greater than the MRL, and 1 contaminant (chloromethane) is detected in 2.25%
of public water systems, as evidenced by one or more sample analytical results greater than the MRL.
Five contaminants -4 THMs and  sulfate- have a considerably higher percent of systems with one or
more sample analytical results greater than the MRL (ranging from 12.12% to 27.42% for the THMs and
88.11% for sulfate). These contaminants are known to have relatively high occurrence.  Select
SDWIS/FED (Round 2) high occurrence contaminants are identified and assessed in more detail in
Section VI.

Table V.B.I.  SDWIS/FED  (Round 2) Data - 20-State Cross-Section Summary of Occurrence
CHEMICAL NAME
(Threshold in u.g/L)
Total
PWS
#GW
PWS
#SW
PWS
% PWS
>MRL
% GW
PWS
% sw
PWS
% PWS >
Threshold
% GW
PWS>
% SW
PWS>
99%
Value
IOCS
Sulfate
(HRL=500,000)
16,495
15,009
1,486
88.11%
87.76%
91.66%
1.79%
1.83%
1.41%
560000
SOCs
Aldicarb1
(HRL=7)
Aldicarb Sulfone1
(HRL=7)
Aldicarb Sulfoxide1
(HRL=7)
Aldrm1
(HRL =0.002)
Butachlor1
(N/A)
Carbaryl1
(MCL=700)
Dicamba1
(MCL=200)
11,972
11,968
11,954
11,745
11,940
12,623
14,034
10,509
10,512
10,500
10,420
10,482
11,086
12,220
1,463
1,456
1,454
1,325
1,458
1,537
1,814
0.01%
0.08%
0.08%
0.01%
0.04%
0.03%
0.34%
0.00%
0.04%
0.03%
0.01%
0.01%
0.02%
0.21%
0.07%
0.41%
0.48%
0.00%
0.27%
0.13%
1.21%
0.00%
0.00%
0.01%
0.01%
0.00%
0.00%
0.01%
0.01%
0.00%
0.00%
0.00%
0.00%
N/A
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
<3.0
<2.0
<4.0
<2.0
<10.0
<10.0
<10.0
                                               54

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EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
CHEMICAL NAME
(Threshold in ug/L)
Dieldrm1
(HRL =0.002)
3-Hydroxycarbofuran1
(N/A)
Methomyl1
(MCL=200)
Metolachlor1
(HRL =70)
Metribuzin1
(HRL=175)
Propachlor1
(MCL=90)
Total
PWS
11,788
12,644
12,604
12,953
13,512
12,050
#GW
PWS
10,329
11,088
11,068
11,503
11,833
10,600
#SW
PWS
1,459
1,556
1,536
1,450
1,679
1,450
% PWS
>MRL
0.09%
0.07%
0.07%
0.83%
0.01%
0.05%
% GW
PWS
0.09%
0.02%
0.05%
0.11%
0.01%
0.02%
% sw
PWS
0.14%
0.45%
0.20%
6.55%
0.00%
0.28%
% PWS >
Threshold
0.09%
% GW
PWS>
0.09%
% sw
PWS>
0.14%
N/A
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
99%
Value
<1.0
<10.0
<50.0
<5.0
<2.0
<5.0
VOCs
Bromobenzene
(N/A)
Bromochlorom ethane2
(MCL=10)
Bromodichlorom ethane
(HRL =60)
Bromoform
(HRL=400)
Bromom ethane
(MCL=10)
Chloroethane
(N/A)
Chloroform
(HRL=600)
Chlorom ethane
(MCL=3)
Dibromochlorom ethane
(HRL =60)
Dibromom ethane
(N/A)
Pichlorodifluorom ethane
1 , 1 -Dichloroe thane
(MCL=5)
1 ,3-Dichloropropane
(N/A)
2,2-Dichloropropane
(N/A)
1 , 1 -Dichloropropene
(N/A)
1,3- Dichloropropene
(HRL =40)
Hexachlorobutadiene2
(HRL =0.9)
Isopropylbenzene2
(N/A)
m -Dichlorobenzene
(HAL=600)
n-Butylbenzene2
(N/A)
n-Propylbenzene2
(N/A)
Naphthalene2
(HRL=140)
o-Chlorotoluene
(MCL=100)
p-Chlorotoluene
(MCL=100)
p-Isopropyltoluene2
(N/A)
24,125
22,974
23,858
18,461
23,328
24,433
23,737
23,478
23,750
23,006
22,141
24,808
24,065
24,096
24,069
16,787
22,736
22,995
24,119
22,972
22,969
22,923
24,118
21,378
22,617
21,461
20,507
21,152
16,348
20,872
21,925
21,021
21,030
21,059
20,454
19,836
22,114
21,430
21,445
21,438
15,178
20,380
20,524
21,457
20,509
20,501
20,524
21,457
18,808
20,320
2,664
2,467
2,706
2,113
2,456
2,508
2,716
2,448
2,691
2,552
2,305
2,694
2,635
2,651
2,631
1,609
2,356
2,471
2,662
2,463
2,468
2,399
2,661
2,570
2,297
0.13%
0.46%
21.97%
12.12%
0.75%
0.34%
27.42%
2.25%
18.37%
0.46%
1.27%
0.74%
0.06%
0.09%
0.07%
0.35%
0.18%
0.24%
0.26%
0.13%
0.23%
0.75%
0.14%
0.12%
0.16%
0.12%
0.32%
16.14%
11.08%
0.74%
0.32%
21.84%
2.04%
14.55%
0.32%
1.23%
0.67%
0.05%
0.07%
0.06%
0.32%
0.13%
0.23%
0.22%
0.12%
0.19%
0.62%
0.11%
0.10%
0.15%
0.23%
1.62%
67.52%
20.11%
0.86%
0.56%
70.54%
4.08%
48.23%
1.53%
1.65%
1.34%
0.11%
0.26%
0.15%
0.62%
0.59%
0.32%
0.53%
0.20%
0.57%
1.92%
0.38%
0.27%
0.26%
N/A
0.03%
0.08%
0.01%
0.06%
0.02%
0.05%
0.00%
0.05%
0.08%
0.30%
0.05%
0.08%
N/A
0.04%
0.58%
0.08%
0.01%
0.55%
0.05%
0.26%
0.78%
0.30%
N/A
0.00%
0.08%
0.00%
0.07%
0.00%
0.11%
N/A
N/A
N/A
0.00%
0.02%
0.00%
0.00%
0.00%
0.13%
N/A
0.00%
0.00%
0.00%
N/A
N/A
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
N/A
<1.0
<1.0
18.8
6.5
<9.0
<2.5
110.0
<2.5
9.7
<1.0
<20.0
<1.0
<2.0
<1.0
<1.0
<0.5
<1.0
<2.0
<1.0
<2.0
<2.0
<2.0
<2.0
<2.0
<2.0
                                     55

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
CHEMICAL NAME
(Threshold in ug/L)
sec-Butylbenzene2
(N/A)
tert-Butylbenzene2
(N/A)
1,1,1,2-
Tetrachloroe thane
1,1,2,2-
Tetrachloroe thane
1 ,2,3-Trichlorobenzene2
(N/A)
Trichlorofluorom ethane2
(HAL=175)
1 ,2,3-Trichloropropane
(MCL=40)
1 ,2,4-Trim ethylbenzene2
(N/A)
1, 3, 5-Trim ethylbenzene2
(N/A)
Total
PWS
22,973
22,973
24,127
24,800
22,532
22,659
24,088
22,965
22,974
#GW
PWS
20,509
20,508
21,462
22,106
20,144
20,329
21,441
20,504
20,513
#SW
PWS
2,464
2,465
2,665
2,694
2,388
2,330
2,647
2,461
2,461
% PWS
>MRL
0.14%
0.11%
0.21%
0.08%
0.19%
1.17%
0.08%
0.76%
0.43%
% GW
PWS
0.14%
0.10%
0.16%
0.05%
0.15%
0.93%
0.06%
0.63%
0.35%
% sw
PWS
0.20%
0.16%
0.64%
0.30%
0.50%
3.22%
0.23%
1.79%
1.10%
% PWS >
Threshold
% GW
PWS>
% sw
PWS>
N/A
N/A
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
N/A
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
N/A
N/A
99%
Value
<2.0
<2.0
<1.0
<1.0
<2.0
<2.5
<1.0
<1.0
<2.0
1. Massachusetts data not included in summary statistics for this contaminant.
2. New Hampshire data not included in summary statistics for this contaminant.
MCL=Maximum Contaminant Level
HAL=Health Advisory Level (as of December 2000)
HRL=Health Reference Level (concentration values used only as reference levels for analyses in this report)
MRL=Minimum Reporting Level
The MCL, HAL, HRL, and MRL values are used in this report only as reference levels to facilitate occurrence assessments.
"% PWS > Threshold" indicates the proportion of systems with any analytical results exceeding the concentration value of the
HRL/MCL/HAL. (Note that results for % PWSs greater than an MCL value does not indicate a MCL violation.  A formal MCL
violation occurs when the MCL is exceeded by the average of four consecutive quarterly samples or confirmation samples as required
by the primacy States.)
N/A= There is no HRL/MCL/HAL available

        Appendix B contains complete occurrence summaries for the SDWIS/FED (Round 2) data.
There is a set of 3 tables of occurrence data for each of the 48 contaminants (similar in construction to
the table sets in Appendix A). The first appendix table of each set (Tables B.I.a, B.2.a, etc., through
B.48.a) contain the system-level summary data presented in Table V.B.I (above), but present the data for
all individual states (rather than just the aggregate data from the 20 states in the cross-section included
above in Table V.B. 1.).  Tables B. 1 .b through B.48.b provide sample-level data and additional descriptive
statistics,  including the total number of analyses and the percent of samples with at least one result greater
than the MRL. These tables also include the minimum concentration, 99th percentile value, maximum
concentration, minimum detection concentration and median detection concentration.  Tables B.l.c
through B.48.C provide similar detailed analytical measures, but provide system-level statistics (as
compared to the sample-level statistics in Tables B.l.b through B.48.b).
VI.     ASSESSMENTS OF SELECT HIGH OCCURRENCE CONTAMINANTS

VI.A.  Selecting High Occurrence Contaminants for Further Analysis

        The contaminants in URCIS (Round 1) and SDWIS/FED (Round 2) were ranked according to
their occurrence to select a group of high occurrence contaminants for more detailed graphical and spatial
assessments.  The contaminants were ranked by percent of systems with at least one sample detection
                                                  56

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               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
(at least one sample analytical result greater than the minimum reporting level) and by percent of systems
with at least one sample analytical result greater than the MCL or HAL or HRL (whichever
MCL/HAL/HRL health effects threshold is relevant to the contaminant in question).  The ranking of the
URCIS  (Round 1) contaminant occurrence data is presented in Table VI. A. 1, and the ranking of
SDWIS/FED  (Round 2) data is presented in Table VI. A. 2. High occurrence was the primary
consideration for selection, but consideration was also given to coverage across contaminant groups,
changing regulatory status between Rounds 1 and 2, and overlap between Rounds  1 and 2.  Table VI.A.3
lists the selected high occurrence contaminants. (Since THMs have been assessed in other studies, only
chloroform is selected here, and is  only assessed graphically in this report.)

Table VI.A.1.  Contaminant Occurrence Ranking of URCIS (Round 1) Data
Percent Systems With At Least One
Sample Analytical Detection
SOCs
X
Dibromochloropropane II 2.49%
Ktlwlene Dibromide II 1.14%
VOCs
X





X

X










X




X


















Chloroform
Bromodichlorom ethane
Dibromochloromethane
Bromoform
Dichloromethane
1,1,1 -Trichloroethane
Trichloroethylene
Toluene
Tetrachloroethylene
Xylenes (Total)
o-Xylene
Ethyl Benzene
p-Xylene
m-Xylene
Trichlorofluorom ethane
cis- 1 ,2-Dichloroethene
Dichlorodifluoromethane
Carbon Tetrachloride
p-Dichlorobenzene
Chloromethane
Naphthalene
Dichloroethene
1,2-Dichloroethane
Benzene
1 , 1 -Dichloroethane
1 ,2,4-Trimethylbenzene
Bromomethane
1 ,2-Dichloropropane
trans- 1 ,2-Dichloroethene
cis- 1 ,2-Dichloropropene
1 ,3 ,5 -Trimethylbenzene
Styrene
Chlorobenzene
Bromochlorom ethane
"Vinyl Chloride
1 ,2, 4-Tri chlorobenzene
1, 2, 3-Tri chlorobenzene
1 , 1 ,2,2-Tetrachloroethane
1 , 1 ,2-Trichloroethene
Chloroethane
Dibromom ethane
n-Butylbenzene
Hexachlorobutadiene
28.63%
22.09%
17.87%
8.95%
4.05%
3.66%
3.54%
3.50%
3.33%
3.04%
1.76%
1.62%
1.58%
1.55%
1.48%
1.47%
1.37%
1.32%
1.25%
1.22%
1.18%
1.17%
1.16%
1.14%
1.14%
0.83%
0.77%
0.67%
0.64%
0.61%
0.61%
0.57%
0.53%
0.50%
0.50%
0.49%
0.49%
0.45%
0.43%
0.39%
0.36%
0.35%
0.35%
Percent Systems With At Least OneSample Analytical
Result Greater than MCL/HAL/HRL
SOCs
X
Dibromochloropropane II 1.32%
Ethvlene Dibromide II 0.16%
VOCs
X
X

X




X











X






















Trichloroethylene
Tetrachloroethylene
Dichloromethane
Chloromethane
Vinyl Chloride
Benzene
Dichloroethene
1,2-Dichloroethane
1 , 1 -Dichloroethane
Carbon Tetrachloride
Bromodichloromethane
Hexachlorobutadiene
Bromomethane
1,2-Dichloropropane
Dibromochloromethane
1,1,2,2-Tetrachloroethane
1 , 1 ,2-Trichloroethene
Bromochlorom ethane
cis- 1 ,2-Dichloroethene
1,1,1 -Trichloroethane
Chloroform
Naphthalene
Trichlorofluorom ethane
1,2,3-Trichloropropane
Bromoform
trans- 1 ,2-Dichloroethene
Toluene
Xylenes (Total)
Ethyl Benzene
Dichlorodifluoromethane
p-Dichlorobenzene
Styrene
Chlorobenzene
1,2,4-Trichlorobenzene
o-Di chlorobenzene
m-Dichlorobenzene
o-Chlorotoluene
1,1, 1 ,2-Tetrachloroethane
p-Chlorotoluene
1,3-Dichloropropene
1,3-Dichloropropane
1 , 1 -Dichloropropene
1,2,3-Trichlorobenzene
0.98%
0.91%
0.77%
0.45%
0.28%
0.25%
0.20%
0.19%
0.18%
0.16%
0.13%
0.11%
0.09%
0.08%
0.06%
0.05%
0.04%
0.03%
0.03%
0.03%
0.02%
0.01%
0.01%
0.01%
0.01%
0.01%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
N/A
N/A
N/A
                                               57

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                 EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Percent Systems With At Least One
Sample Analytical Detection

















n-Propyulbenzene
o-Dichlorobenzene
Isopropyltoluene
1,2,3-Trichloropropane
trans- 1,3-Dichloropropene
m-Dichlorobenzene
p-Isopropyltoluene
sec-Butylbenzene
o-Chlorotoluene
Bromobenzene
tert-Butylbenzene
1,1,1 ,2-Tetrachloroethane
p-Chlorotoluene
1,3-Dichloropropene
2,2-Dichloropropane
1 , 1 -Dichloropropene
1 "3-Fiir.lilnrnnrnnanfi
0.33%
0.28%
0.27%
0.25%
0.25%
0.25%
0.25%
0.23%
0.20%
0.19%
0.19%
0.18%
0.17%
0.16%
0.15%
0.13%
ft 1 9%
Percent Systems With At Least OneSample Analytical
Result Greater than MCL/HAL/HRL

















1,2,4-Trimethylbenzene
1,3,5-Trimethylbenzene
2,2-Dichloropropane
Bromobenzene
Chloroethane
cis-l,2-Dichloropropene
Dibromomethane
Isopropyltoluene
m-Xylene
n-Butylbenzene
n-Propyulbenzene
o-Xylene
p-Isopropyltoluene
p-Xylene
sec-Butylbenzene
tert-Butylbenzene
tranซ-1 ^-Fiip.Vilnrnnrnnpnp
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
XT/ A
X = Contaminants selected for graphical/spatial assessment
N/A = There is no Health Reference Level (HRL), Maximum Contaminant Level (MCL), or Health Advisory Level (HAL) for the
contaminants.
Table VI.A.2. Contaminant Occurrence Ranking of SDWIS/FED (Round 2) Data
Percent Systems With At Least One
Sample Analytical Detection
SOCs
X

X
X









Metolachlor
Dicamba
Dieldrin
Aldicarb Sulfoxide
Aldicarb Sulfone
Methomyl
3-Hydroxycarbofuran
Propachlor
Butachlor
Carbaryl
Aldrin
Aldicarb
Metrihuzin
VOCs
X



X





X










Chloroform
Bromodichloromethane
Dibromochlorom ethane
Bromoform
Chloromethane
Dichlorodifluorom ethane
Trichlorofluoromethane
1,2,4-Trimethylbenzene
Naphthalene
Bromomethane
1 , 1 -Dichloroethane
Bromochloromethane
Dibromomethane
1,3,5-Trimethylbenzene
1,3-Dichloropropene
Chloroethane
m-Dichlorobenzene
Isopropylbenzene
n-Propylbenzene
1,1, 1 ,2-Tetrachloroethane
1 -2.3-Trichloroben7ene
0.83%
0.34%
0.09%
0.08%
0.08%
0.07%
0.07%
0.05%
0.04%
0.03%
0.01%
0.01%
0 0 1 %

27.42%
21.97%
18.37%
12.12%
2.25%
1.27%
1.17%
0.76%
0.75%
0.75%
0.74%
0.46%
0.46%
0.43%
0.35%
0.34%
0.26%
0.24%
0.23%
0.21%
0.19%






































Percent Systems With At Least One
Sample Analytical Result Greater than MCL/HAL/HRL
SOCs
X

X







X


Dieldrin
Aldrin
Aldicarb Sulfoxide
Metribuzin
Aldicarb
Carbaryl
Propachlor
Methomyl
Aldicarb Sulfone
Dicamba
Metolachlor
Butachlor
3-Hvdroxvcarhofuran
VOCs
X
X



X















Chloromethane
1,1 -Dichloroethane
Dibromochlorom ethane
Bromodichloromethane
Bromomethane
Chloroform
Bromochloromethane
Hexachlorobutadiene
Bromoform
1,2,3-Trichloropropane
1,1, 1 ,2-Tetrachloroethane
1,1,2,2-Tetrachloroethane
1,3-Dichloropropene
Dichlorodifluorom ethane
m-Dichlorobenzene
Naphthalene
o-Chlorotoluene
p-Chlorotoluene
Trichlorofluoromethane
1 , 1 -Dichloropropene
1 .2.3-Trichloroben/ene
0.09%
0.01%
0.01%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
N/A
N/A

0.58%
0.08%
0.08%
0.08%
0.06%
0.04%
0.03%
0.02%
0.01%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
N/A
N/A
                                                    58

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               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Percent Systems With At Least One
Sample Analytical Detection













Hexachlorobutadiene
p-Isopropyltoluene
sec-Butylbenzene
o-Chlorotoluene
Bromobenzene
n-Butylbenzene
p-Chlorotoluene
tert-Butylbenzene
2,2-Dichloropropane
1,2,3-Trichloropropane
1,1,2,2-Tetrachloroethane
1 , 1 -Dichloropropene
1 ^-Fiir.lilnrnnrnnanfi
0.18%
0.16%
0.14%
0.14%
0.13%
0.13%
0.12%
0.11%
0.09%
0.08%
0.08%
0.07%
ft ftfi%














Percent Systems With At Least One
Sample Analytical Result Greater than MCL/HAL/HRL













1,2,4-Trimethylbenzene
1,3,5-Trimethylbenzene
1,3-Dichloropropane
2,2-Dichloropropane
Bromobenzene
Chloroethane
Dibromomethane
Isopropylbenzene
n-Butylbenzene
n-Propylbenzene
p-Isopropyltoluene
sec-Butylbenzene
tfirt-Riitvlhfinypnfi
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
XT/ A
X= Contaminants selected for graphical/spatial assessment
N/A = There is no Health Reference Level (HRL), Maximum Contaminant Level (MCL), or Health Advisory Level (HAL) for the
Table VI.A.3. High Occurrence Contaminants Selected for Graphical and Spatial Assessments (and
some characteristics  considered in the selection).
Contaminant
Trichloroethylene
Tetrachloroethylene
Chloromethane
1 , 1 -Dichloroethane
Chloroform
Ethylene Dibromide
Dieldrin
Aldicarb Sulfoxide
Metolachlor
Regulated
(Round 2)
(Round 2)



(Round 2)



Unregulated
.
•
•
•
•
.
•
•
•
voc
.
.
•
.
.




soc





.
.
•
•
THM




•




URCIS
(Round 1)
.
.
•
.
.
.



SDWIS/
FED
(Round 2)


•
•
•

•
•
•
VLB.  Graphical and Spatial Assessments of Select High Occurrence Contaminants

        The URCIS (Round 1) and SDWIS/FED (Round 2) cross-section states used in the more detailed
assessments in this section were shown previously in Figure V.A.1.  Most of the Section VI figures
(graphs and maps) present analytical results based on these cross-section states. Some figures (discussed
below) use additional state data to increase spatial coverage.  All these graphical and spatial assessments,
evaluated together with the analytical results tables presented throughout this report (and report
appendices), serve to develop a more comprehensive overview of the degree, distribution, and temporal
trends (if any) of contaminant occurrence.  These graphical and spatial assessments are conducted to
provide additional analytical  detail for the select high occurrence contaminants (of potentially greater
regulatory interest), and examples of graphical and spatial assessments that can be  conducted for any
other contaminants of interest. For contaminants of lower occurrence, however, the data maybe too
sparse to support much analysis.

        One important aspect of the cross-section state data must be considered as part of any
conclusions drawn from the maps and graphs in this report. The development of the nationally
                                                59

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               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
representative cross-sections were discussed for URCIS (Round 1) and SDWIS/FED (Round 2) data in
Section III of this report. These national cross-sections are developed from public water systems'
contaminant monitoring data with the intent that, in aggregate, the cross-section states' occurrence
findings are indicative of national occurrence.  (Various occurrence comparisons between the URCIS
and SDWIS/FED data, as well as comparisons to other state data sets, indicate that these cross-section
states do provide contaminant occurrence data that are reasonable indications of national occurrence.)
Therefore, although sub-national occurrence findings, such as regional or multi-state occurrence patterns,
can be valid and useful for these initial assessments, any regional occurrence patterns (or absence of
patterns) should be considered in the context of the source and coverage of the state cross-section data.
With half (or more) of the states without adequate data (and therefore not in the cross-sections used for
analyses), regional patterns may be difficult to characterize and must be interpreted with caution.
Supplemental information should be collected and used, whenever possible, to assist in evaluating the
significance of any apparent regional patterns.

       The figures presented below illustrating distribution of occurrence must be based on non-biased
data, and for these figures only the cross-section state data are used to develop the maps and graphs.
However, to increase the spatial coverage of the figures that broadly indicate contaminant occurrence
(Figures VI.B.l.a, VI.B.2.a, VI.B.S.a, VI.BAa, VI.B.S.a, VI.B.6.a, VI.B.T.a, and VI.B.S.a), all  data
from all states with data in URCIS (Round 1) and SDWIS/FED (Round 2) are used. Therefore, in these
figures the data from cross-section states are included, but so are data from the non-cross-section states
(i.e., states with limited or biased data). This more extensive use of the data in the databases can be
appropriate when a simple 'yes or no' identification of states with any PWS contaminant detection is of
interest. For example, Figure VLB.l.a illustrates the states with and without a detection of ethylene
dibromide (states with or without at least one PWS with one or more monitoring sample analytical
detection). Based on the 28 states with ethylene dibromide occurrence data, there appears to be no
distinct geographic pattern of occurrence. As stated above, however, this interpretation should be
considered cautiously and as preliminary at best.  Even using data from all the (cross-section  and non-
cross-section) states, there are 12 states with no data included in URCIS (Round 1), and another  10 states
with some data in URCIS (Round 1), but with no data on ethylene dibromide. Other considerations  and
some interpretations of the occurrence data illustrated in the figures are presented below.
                                                60

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
VI.B.l.   Ethylene Dibromide

        Figures VI.B.l.a through VI.B.l.c are of URCIS (Round 1) contaminant occurrence data for
ethylene dibromide.  Figure VI.B.l.a based on all avilable URCIS data, suggests widespread occurrence
and apparent lack of spatial or geographic occurrence pattern of ethylene dibromide as based on the
identification of states with (and without) public water systems having detections of ethylene dibromide.
As previously noted, conclusions regarding geographic patterns of occurrence, or lack of occurrence,
based on these maps must be considered with caution in the absence of supplemental information. As
can also be seen in Figure VI.B.l.a, 22 states have no occurrence data for ethylene dibromide in the
URCIS database.

        In the lower graph of Figure VI.B.l.c, there appears to be a higher percent of public water
systems with ethylene dibromide analytical results greater than the MCL  after 1986.  Note, however, that
a similar temporal  pattern is found with many of the contaminants in later figures.  In all these cases,
rather than a definitive increase in contaminant occurrence (in the values seen in 1987), these increases
likely reflect a change in the regulatory requirements associated with the  SDWA 1986 amendments.
There may be, though, a real  decrease in the percent of public water systems with ethylene dibromide
analytical results greater than the MRL from 1988 to 1992, as seen in the upper graph of Figure VI.B.l.c.
Figure VLB.l.a.  Detections of Ethylene Dibromide - All States with Data in URCIS (Round 1)
                                            URCIS (Round 1) States
                                                    Ethylene Dibromide Detections in URCIS
                                                      JStates notin URCIS
                                                      JNo Data for Ethylene D ibromide
                                                      JStates with No Detections (No PWSs > Detection Lim it)
                                                      • States with Detections (Any PWSs > Detection Limit)
                                                 61

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                    EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.l.b.  Distribution of Ethylene Dibromide Occurrence - URCIS (Round 1) Data
                                                 URCIS (Round 1) C ro ss-Sec tlon States
                    * The state (/Alabama is an outlier with 11.45%PWSs> theDetectionLmit
                                                                             Ethylene Dibromide Occurrence in URC IS
                                                                                 States not in Cross-Section
                                                                                 No Data for Ethylene Dibromide
                                                                                I 0.00% PWS s > Detec Son Limit
                                                                                1 0.01 - 2.50% PWSs> Detection Limit
                                                                                12.50- 5.50% PWSs> Detection Limit*
                                                 URCIS (Round 1) Cross-Section States
                                                     o
Ethylene Dibromide Occurrence in URCIS

|    | States not in Cross-Section
     No Data for Ethylene Dibromide
          PWSs> MCL
                    >MCL
                    >MCL
                                                               62

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Figure VLB.l.c. Ethylene Dibromide Occurrence By Year - URCIS (Round 1)
                                    Percent PWSs > Detection Limit
                   1984     1985     1986    1987    1988    1989    1990    1991    1992
                                        Percent PWSs > MCL
                   1984     1985     1986     1987    1988    1989    1990    1991    1992
                                                 63

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                EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
VI.B.2.   Tetrachloroethylene

        Figures VI.B.2.a through VI.B.2.C are of URCIS (Round 1) contaminant occurrence data for
tetrachloroethylene. Tetrachloroethylene (sometimes referred to as perchloroethylene, or 'perc', or PCE)
and trichloroethylene (sometimes referred to as TCE) (Figures VI.B.S.a to VI.B.S.c), also appear to be of
very widespread occurrence.  The well-established co-occurrence of these two contaminants is reflected
in the maps and graphs, though it appears that tetrachloroethylene (Figure VI.B.2.a) is of more
widespread occurrence than trichloroethylene (Figure VLB.3.a) as based on the general measure of
occurrence used in these two figures (note, however, that more states have reported tetrachloroethylene
data than have reported trichloroethylene data).
Figure VI.B.l.a. Detections of Tetrachloroethylene - All States with Data in URCIS (Round 1)
                                            URCIS (Round 1) States
                                                    Tetrachloroethene Detection sin URC IS
                                                      TStates not in URCIS
                                                      JNo Data for Tetrachlorothene
                                                      IStates withNo Detections (NoPWSs > Detection Limit)
                                                      [States with Detections (Any PWSs > Detection Limit)
                                                  64

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                     EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Figure VLB.l.b. Distribution of Tetrachloroethylene Occurrence - URCIS (Round 1) Data
                                                    URCIS (Rou nd 1) Cross-Section States
                    * The sfates of Alabama andNorth Carolina areoi&liers at 15.91%
                    and 13.80%PWSs > the Detection Lin it, respectively
Tetrachloroethene Occurrence in URCIS
     States not in Cross-Section
     No Data for Tetrachlorothene
     0.00% PWSs> Detection Limit
     0.01 -3.50% PWSs> Detection Limit
     3.50-7.00 % PWSs > Detection Limit*
                                                    URC IS (Round 1) Cross-Section States
                    "The state cf Aabama is an outlier with 3.79% PWSs >MCL
                                                                                Tetrachloroethene Occurr ence in UR CIS
                                                                                     States not in Cross-Section
                                                                                     No Data for Tetrachlorothene
                                                                                     0.00%PWSs>MCL
                                                                                     0.01- 1.00% PWSs >MCL
                                                                                     1.00-3.00% PWSs>MCL*
                                                                 65

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.2.C. Tetrachloroethylene Occurrence By Year - URCIS (Round 1)
            16%




            14%



            12%




            ICP/o
             6%




             4%-H



             2%




             0%
                                    Percent PWSs > Detection Limit
                    1984     1985     1986     1987     1988     1989     1990     1991     1992
                                         Percent PWSs > MCL
                   1984     1985     1986     1987    1988    1989    1990     1991     1992
                                                  66

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
VI.B.3.   Trichloroethylene

        Figures VLB.3.a through VI.B.3.C are of URCIS (Round 1) contaminant occurrence data for
trichloroethylene (sometimes referred to as TCE). Trichloroethylene (like the previously described
tetrachloroethylene) appears to be of widespread occurrence. Figure VI.B.S.b (the upper map) shows
that some states have relatively high percentages of public water systems with sample detections.
However, due to a considerable number of states without data, it may be difficult to definitely conclude if
there is a geographic/spatial pattern of this relatively high occurrence.  The lower map in Figure VI.B.3.b
also indicates some relatively high percentages of public water systems with samples of trichloroethylene
above the MCL.  Regarding temporal patterns, there appears to be no distinct increase or decrease in the
percent of public water systems with  analytical results greater than the detection limit or MCL.  Note,
however, the same caution regarding  unavailable state data affects interpretation  of temporal trends as
well.
Figure VI.B.3.a. Detections of Trichloroethylene - All States with Data in URCIS (Round 1)
                                            URCIS (Rou nd 1) St ates
                                                                      URCIS
                                                      IStatesnot in URCIS
                                                      1 No Data for Trichlroethene
                                                      1 States with No Detections (No PWSs > Detection Limit)
                                                      I Stateswith Detections (Any PWSs > Detection Limit)
                                                 67

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                     EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.3.b. Distribution of Trichloroethylene Occurrence - URCIS (Round 1) Data
                                                   URC IS (Round 1) Cross-Section S tales
                     w The states of North Carolina (fid Alabama are ouiiers at 14.14%
                     and 12.69%PWSs> theDetectionLimif respectively
Trichloroethene Occurrence in URCIS
     States not in Cross-Section
     No Data for Trichlroethene
     0.00% PWSs > Detection Limit
     0.01 - 5.00% PWSs > Detection Limit
     5.00- 10.00%PWSs> DetectionLimit*
                                                   URCIS (Round 1) Cross-Section States
                                                                                      States not in Cross-Section
                                                                                      No Data forTnchlroethene
                                                                                      0.00% PWSs >MCL
                                                                                      0.01 - 1.50% PWSs >MCL
                                                                                      1.50-3.00% PWSs >MCL

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               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.3.C. Trichloroethylene Occurrence By Year - URCIS (Round 1)
            16%
            14%
            12%
            lOP/o
            8%
            6%
            4%
            2%-|—I
            0%
                                  Percent PWSs > Detection Limit
                  1984    1985     1986    1987
1989    1990    1991     1992
                                     Percent PWSs > MCL
            7%
            6%
            5%
            4%
            3%
            2%
            1%
            0%
                  1984    1985    1986    1987    1988    1989    1990    1991    1992
                                               69

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
VI.B.4.   Aldicarb Sulfoxide

        Figures VI.BAa through VI.B.4.C are of SDWIS/FED (Round 2) contaminant occurrence data
for aldicarb sulfoxide.  A review of the aldicarb figures illustrates some of the interpretive cautions
mentioned previously.  Figure VI.BAb suggests that aldicarb sulfoxide detections are more evident in
northern states (likely related to specific farm crops and pesticide use). The figure shows higher
percentages of PWSs with detections greater than the MRL in Michigan, Missouri, Washington, and
Oregon (in the upper map in Figure VI.BAb), and  only Oregon in the highest percentage of PWSs with
detections of aldicarb sulfoxide greater than its HRL (lower map in Figure VI.BAb).

        However, three states (Florida, New York, and Wisconsin) with known, historic problems with
aldicarb in groundwater (Hallberg, 19895 ; Barbash and Resek, 19966) do not have data in the
SDWIS/FED (Round 2) database. Apparent spatial and geographic patterns must be viewed and
interpreted carefully.  Figure VI.BAa (using all available Round 2 aldicarb sulfoxide data in
SDWIS/FED) indicates that the occurrence of aldicarb sulfoxide is more widespread (with the additional
'detection' states of Pennsylvania and Massachusetts) than suggested in Figure VI.BAb,  yet there are no
data available in the databases  for the three states with known historic aldicarb occurrence problems.
Any preliminary conclusions made regarding the geographic patterns (or lack of patterns) of aldicarb
sulfoxide occurrence must consider this reality of missing data coverage.  Other contaminants differ in
their coverage (or lack of coverage) of occurrence data.

        In Figure VI.BAc, the apparent significant decrease in occurrence after 1992 (in the upper
graph) is possibly due to changes in monitoring requirements with the 1993 Amendments to SDWA.
Although there is a "spike" (a significant but short-lived increase) in the percent of public water systems
with analytical results greater than the HRL (in the lower graph), this reflects  a very small increase in the
number of systems (note the y-axis scale of the graph).
          Hallberg, G.R. 1989a.  "Pesticide Pollution of Groundwater in the Humid United States." In H. Bouwer and R.S. Bowman,
eds., Effect of Agriculture on Groundwater; Agriculture, Ecosystems, and Environment. Special edition, v. 26, p. 299-367.  1989.

          Barbash, J.E., and E.A. Resek. Pesticides in Ground Water, volume two of the series Pesticides in the Hydrologic System.
Ann Arbor Press, Inc., Chelsea, Michigan. 1996.


                                                 70

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                    EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.BAa.  Detections of Aldicarb Sulfoxide - All States with Data in SDWIS/FED (Round 2)
                                                     SDWIS/FE D (Round 2) States
                                                                Aldicarb Sulfoxide Detections in SDWIS/FED
                                                                  ] States not in SDWIS/FED
                                                                  1 No data for Aldicarb Sulfoxide
                                                                  1 States with No Detections (NoPWSs > Detection Limit)
                                                                  I States with Detections (Any PWSs > Detection Limit)
                                                             71

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                     EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.BAb. Distribution of Aldicarb Sulfoxide Occurrence - SDWIS/FED (Round 2) Data
                                               SDWIS/FED (Round 2) Cross-Section States
                    *State of Massachusetts is an aiiier with 20.93% PWSs> ths Detection Limit
                                                                           Aldicarb Sulfoxide Occurrence in SDWIS/FED
                                                                               States not in Cross-Section
                                                                               No data for Aldicarb Sulfoxide
                                                                               0.00% PWSs> Detection Limit
                                                                               0.01 - 1.00%PWSs> Detection Limit
                                                                               1.00- 2.00%PWSs> Detection Limit*
                                                 SDWIS/FED (Round 2) Cross-Section States
                                                                           Aldicarb Sulfoxide Occurrence in SDWIS/FED
                                                                               States not in Cross-Section
                                                                               No data for Aldicarb Sulfoxide
                                                                               0.00% PWSs>HRL
                                                                               0.01- 1.00%PWSs> HRL
                                                                               1.00-2.00%PWSs> HRL
                                                                72

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EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI
.B.4.c. Aldicarb Sulfoxide Occurrence By Year - SDWIS/FED (Round 2)
Percent PWSs > Detection Limit
10%
oo/
f.%
zL%
oo/ .
Z/o
f\Q/











1 1 i 	 1 . 	 .
U/o I I I I I
1992 1993 1994 1995 1996 1997



Percent PWSs >HRL
n n/i%-r
n n^% -
n 09% -
n ni % -
n nno/ .












1992 1993 1994 1995 1996 1997
                                     73

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                EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
VI.B.5.   Dieldrin

        Some general comments can be made about the occurrence of dieldrin (illustrated in Figures
VLB.5.a through VI.B.5.c). Dieldrin detections appear to be limited to states south of a line extending
between Texas and Massachusetts (see Figure VLB.5.a). In Figure VI.B.5.b, both maps ("greater than
detections" in the upper map, and "greater than the HRL" in the lower map) reflect this same apparent
distribution, though note the number of agricultural states with no data.  In Figure VI.B.5.C, a downward
annual trend in dieldrin occurrence is suggested.
Figure VI.B.S.a. Detections of Dieldrin - All States with Data in SDWIS/FED (Round 2)
                                          SDWIS/FED (Round 2) States
                                                                  SDWIS/FED
                                                        States notin SDWIS/FED
                                                       I No data for Dieldrin
                                                        States with NoDetections (NoPWSs > Detection Limit)
                                                        States with Detections (Any PWSs> Detection Limit)
                                                  74

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                    EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.S.b. Distribution of Dieldrin Occurrence - SDWIS/FED (Round 2) Data
                                                SDWIS/FED (Round 2) Cross-Section States
                    * Sate of Massachusetts is an outlier with 18.18% PWSs > the Detection Limit
                                                                               Dieldrin Occurrence in SDWIS/FED
                                                                                    Statesnot in Cross-Section
                                                                                    No data for Dieldrin
                                                                                    0.00% PWSs > Detection Limit
                                                                                    0.01 -  1.00% PWSs > Detection Limit
                                                                                    > 1.00% PWSs > Detection Limit *
                                               SD WIS/FE D (Round 2) Cro ss-Se ction State s
                                                      o
Dieldrin Occurrence In SDWIS/FED
|    | States not in Cross-Section
|    | No data for Dieldrin
I    | 0.00%  PWSs> HRL
|    | 0.0 1 - 1.00% PWSs > HRL
   H > 1.0 0% PWSs > H RL
                                                               75

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               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.S.c. Dieldrin Occurrence By Year - SDWIS/FED (Round 2)
            l.CP/o
           O.CP/o
            1.0%






            0.8%






            0.6%






            0.4%






            02%






            0.0%
                                  Percent PWSs > Detection Limit
                     1992        1993        1994       1995       1996       1997
                                      ftrcmtPWSi>HRL
                     1992       1993       1994       1995       1996       1997
                                              76

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                 EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
VI.B.6.   Metolachlor

        Metolachlor, in Figures VI.B.6.a to VI.B.6.C, also appears to be of widespread, but generally low,
occurrence.  Again, note the number and location of states with no metolachlor data.
Figure VI.B.6.a.  Detections of Metolachlor - All States with Data in SDWIS/FED (Round 2)
                                            SDWIS/FED (Round 2) States
                                                       Metolachlor Detections In SDWIS/FED
                                                          1 Statesnot in SDWISEED
                                                          1 No data for Metolachlor
                                                          I States with No Detections (No PWSs > Detection Limit)
                                                          I Stateswith Detections (Any PWSs > Detection Limit)
                                                     77

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                    EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.6.b. Distribution of Metolachlor Occurrence - URCIS (Round 1) Data
                                              SDWIS/FED (Round 2) Cross-Section States
                                                                              Metolachlor Occurrence In SDWIS/FED
H                                                                                   States not in Cross-Section
                                                                                   No Data forMetolachlor
                                                                                   HO.00% PWSs > Detection Limit
                                                                                   0.01 - 1.00%  PWSs> Detection Limit
                                                                                   HI.00 - 10.00% PWSs> Detection Limit
                                                                                   10.00 -20.00% PWSs > Detection Limit
                                               SDWIS/FED (Round 2) Cross-Section States
                                                      o
Metolachlor Occurrence in SDWIS/FED
     States not in Cross-Section
     No data for Metolachlor
     0.00% PWSs>HRL
     0.01 - 1.00% PWSs>HRL
     1.00- 10.00% PWSs >HRL
     10.00 - 20.0 0% PW Ss > HR L
                                                               78

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.6.C.  Metolachlor Occurrence By Year - SDWIS/FED (Round 2)
             2.5%
             2.0%
             1.5%
             1.0%
             0.5%
             0.0%
                                     Percent PWSs > Detection Limit
                       1992        1993       1994       1995        1996        1997
There are no PWSs with analytical results exceeding the concentration value of the HRL for Metolachlor in SDWIS/FED (Round 2).
                                                  79

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               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
VI.B.7.   1,1-Dichloroethane

       Figures VLB.7.a through VI.B.T.e present occurrence findings for 1,1-dichloroethane.  Data are
available from both Round 1 and Round 2 for 1,1-dichloroethane (as well as chloromethane and
chloroform).  As is shown in Figure VI.B.7.a, the occurrence of 1,1-dichloroethane is extensive, where
public water systems with at least one detection of 1,1-dichloroethane occur in 42 of the 46 states with
data (there is a total of 46 cross-section and non-cross-section states with 1,1-dichloroethane data in
either URCIS [Round 1] and SDWIS/FED [Round 2]). In Figure VI.B.7.b, the upper map shows that
public water systems with at least one detection of 1,1-dichloroethane occur in 32 of the 34 combined
cross-section states (all cross-section states combined from URCIS [Round 1] and SDWIS/FED [Round
2]). Occurrence based on the MCL is shown in the lower map of Figure VI.B.7.b.  As described
previously, 'cross-section' maps (such as the maps in Figure VI.B.7.b) include data from the cross-
section states only. In contrast, the 'all states' map (the map in Figure VLB.7.a) include data from all
states in either the URCIS (Round 1)  or SDWIS/FED  (Round 2) database.  States not in the cross-
section contain data that  are biased either due to selective reporting (PWSs reported only or mainly
detections) or because the state data derive from an incomplete number of PWSs (the number of PWSs
reporting is significantly  less than the  known number of PWSs in a particular  state).  Neither of these
types  of data bias, however, affect the determination of whether or not any detections are present  at the
state level. Therefore, the (biased) data can be used here to expand the spatial coverage.

       Figure VI.B.7.b, combining the cross-section state data from URCIS (Round 1) and SDWIS/FED
(Round 2) provides  a more complete picture of occurrence than can be seen in Figure VI.B.7.c. Based
on the percentage of PWSs with analytical results greater than the detection limit (the upper map in
Figure VI.B.7.b), there appears to be generally higher  levels of occurrence in states east of the
Mississippi River. Again, supplemental information (such as regional studies)  would be necessary to
make definitive conclusions on 1,1-dichloroethane occurrence distributions.

       The distributions of 1,1-dichloroethane occurrence are based on the detections in Figure VI.B.7.C
independently for URCIS (Round 1) cross-section data in the upper map and for SDWIS/FED (Round 2)
cross-section data in the  lower map.

        Figure VI.B.7.d traces 1,1-dichloroethane occurrence by year from 1984/85 to  1997.  Data from
1984 to 1992 are from URCIS (Round 1), and data from 1992 to 1997 are from SDWIS/FED (Round 2).
(The database coverage overlap explains why there are two 1992 periods of data in the graph; to the left
is the last year of the Round 1 data, and to the right is the first year of the Round 2 data.)  Even
considering the possible influences of regulatory changes due to SDWA amendments in 1986 and 1993,
there appears to be a decrease in the occurrence of 1,1-dichloroethane  over this ten year period when
based on either percent PWSs with analytical results greater then the  detection limit (upper graph) or
greater than the MCL (lower graph).

       Figure VI.B.7.e compares  1,1-dichloroethane occurrence from Round 1 to Round 2 for the 8
states with data in both sampling rounds.  With occurrence based on the detection limit (upper graph), no
consistent temporal trend is suggested for the data from the 8 states between URCIS (Round 1) to
SDWIS/FED (Round 2); in some states SDWIS/FED (Round 2) occurrence results are higher, and in
some states lower. When occurrence is based on MCLs (lower graph), there is an apparent decreasing
trend of 1,1-dichloroethane occurrence in 4 of the 8 states (with the other 4 states indicating no
occurrence in either rounds).  The results in Figure VI.B.7.e seem to  at least partially corroborate the
decreasing occurrence trend indicated the aggregated cross-section state data in Figure VI.B.7.d (above).

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                  EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.T.a.  Detections of 1,1-Dichloroethane - All States with data in URCIS (Round 1) and
SDWIS/FED (Round 2)
                                        All URCIS (Round 1) and SDWIS/FED (Round 2) States
                                                           1,1-Dlchloroe thane Detections In URCIS and SDWIS/FED
                                                              ] States notinURCIS or SDWIS/EED
                                                              1 No Data for 1,1 -Dichloroethane
                                                              I States with No Detections (NoPWSs > Detection Limit)
                                                              I States with Detections (Any PWSs> Detection Limit)
                                                         81

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                    EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.T.b.  Round 1  and Round 2 cross-section states with PWSs with detections of
1,1-Dichloroethane (above) and with concentrations above the MCL (below)
                                        URCIS (Round 1) and SDWIS/FED (Round 2) Cross-Section States
                     * Four states are outliers: Florida at 7.08%; Wyomhgat 5.52%;
                     Arkansas at 11.55%; Masmclu^tts at5.71% PWSs > the Detection Limit
1,1-Dichloroethane Occurrence
  URCIS and SDWIS/FED

    Statesnot in Cross-Section
    No Data for 1,1-Dichloroethane
    0.00 % PWSs > Detection Limit
    0.0 1-1.00 % PWSs > Detection Limit
    1.00 - 3.50 % PWSs > Detection Limit*
                                        URCIS (Round 1) and SDWIS/FED (Round 2) Cross-Section States
                                                                                   1,1-Dichloroethane Occurrence
                                                                                   in URCIS and SDWIS/FED

                                                                                   II States not in Cross-Section
                                                                                   P~I No Data for 1,1 -Dichloroethane
                                                                                   I   | 0.00% PWSs >MCL
                                                                                   r~|0.01 - 1.00%PWSs>MCL
                                                                                   ^H 1.00-3.50% PWSs> MCL
                                                               82

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                     EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Figure VLB.V.c.  States with PWSs with detections of 1,1-Dichloroethane (any PWSs with
results greater than the detection limit) for Round 1 (upper map) and Round 2 (lower map) cross-section
states
                                                    URCIS (Round 1) Cross-Section States
                      * The states of Florida and Wyoming are outliers at 7.08%
                      and 5.52% P WSs > the Detection Li mit, respectively
     1,1-Dichloroethane Occurrence inURCIS

     I  I states tint in Cross-Section
     I	INo Data for 1,1-Dichloroethane
     I  10 00 % PWSs > Detection Limit
     ^•o.Ol - 1.00 % PWSs > Detection Limit
     • l.OO - 3.50% PWSs > Detection Limit*
                                                  SDWIS/FED (Round 2) Cross-Section States
                       * The states of Arkansas and Massachusetts are outliers at 11. 55%
                       and 5.71% PWSs > the Detect on Limit, respectively
1,1-Dichloroethane Occurrence in SDWIS/FED

II States not in Cross-Sect ion
I   [No Data for 1,1-D ichloroethane
II 0.00% PWSs> Detection Limit
110.0 1 - 1.00 % PWSs > Detection Limit
THl.OO- 3.50 % PWSs > Detection Limit*
                                                                 83

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                  EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.T.d.  1,1-Dichloroethane Occurrence By Year (1984 - 1997)
1.5%-

0.9% •

0.3% •
0.0% H
Percent PWSs > Detectio





































1984 1985 1986 1987 1988 1989 1990 1991 1992
n Limit

n
i — 1
^[
1992 1993 1994 1995 1996 1997
0.15%-
0.12%"

0.06% "
0.03% "
Percent










PWSs > M(




—











:L




PI


-




n H
0.00% "1
1984 1985 1986 1987 1988 1989 1990 1991 1992 1992 1993 1994 1995 1996 1997
The vertical line in both graphs, located between the 1992 listings, marks the division between Round 1 data (for years less than and
equal to 1992) to the left of the line, and Round 2 data (for years greater than and equal to 1992) to the right.
                                                       84

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               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.T.e. Occurrence of 1,1-Dichloroethane By State - URCIS (Round 1) and SDWIS/FED
(Round 2)
            4%
            3%
            2%
                   AK
                              Percent PWSs > Detection Limit
KY      MD     MN     NC     NM      OH     WA
                                    DRoundl    •Round2

0.7% "
0.6% "
0.5% "
0.4% "


0.1% "
Percent PWSs > MCL







0.0% 4 i i
AK KY

|-|








MD MN NC
D Round 1 • Round 2



NM OH WA

                                             85

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                EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
VI.B.8.   Chloromethane

        Detections and distribution of chloromethane are addressed with maps and graphs (Figures
VLB.8.a to VI.B.8.e) similar to those for 1,1-dichloroethane.  Chloromethane is of widespread and
relatively high levels of occurrence (see Figures VI.B.8.a, .b, .c).  There also appears to be a relatively
wide range of occurrence levels as well, which is best seen in Figure VI.B.S.b (noting the "outlier"
occurrence states).  Temporally, occurrence trends may have decreased from 1988 to 1992, but appear to
be stabilizing (Figure VI.B.S.d lower map) or, by  other measures increasing (Figure VI.B.S.d upper map).
Figure VI.B.S.a.  Detections of Chloromethane - All States with Data in URCIS (Round 1) and
SDWIS/FED (Round 2)
                                    All URCIS (Round 1) and SDWIS/FED (Round 2)States
                                                      ChloromethaneDetectlonsln URCIS and SDWIS/FED
                                                        1 StatesnotinURCIS or SDWIS/EED
                                                        1 No Data for Chloromethane
                                                        1 States with No Detections (NoPWSs > Detection Limit)
                                                        ] States with Detections (Any PWSs > Detection Limit)
                                                  86

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                    EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.S.b.  Round 1 and Round 2 cross-section states with PWSs with detections of
Chloromethane (above) and with concentrations above the Health Reference Level (HRL, below)
                                       URCIS (Round 1) and SDWIS/FED (Round 2) Cross-Section States
                    * Four states am outliers: Alabamaat 10.69%; Arkansas at 19.66%;
                    Kentucky at29.03%; NorthDakota at 39.19/a PWSs > tieDetectiaiLimit
Chloromethane Occurrence
In URCIS and SDWIS/FED

    States not in Cross-Section
    No Data for Chloromethane
    0.00% PWSs > Detection Limit
    0.01 - 2.00 % PWSs > Detection Limit
    2.00 - 5.00 % PWSs > Detection Limit*
                                      URCIS (Round 1) and SDWIS/FED (Round 2) Cross-Section States
                    * Thestat of Kentucky is anautUer at6.49% PWSs > ACL
Chloromethane Occurrence
In URCIS and SDWIS/FED

    States not in Cross-Section
    No Data for Chloromethane
    0.00% PWSs > MCL
    0.01 - 1.00% PWSs >MCL
    1.00-4.00% PWSs >MCL*
                                                             87

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                     EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Figure VLB.S.c.  States with PWSs with detections of Chloromethane (any PWSs with
results greater than the detection limit for Round  1  (upper map) and Round 2 (lower map) cross-section
states
                                                    URCIS (Round 1) C ross-Sec lion States
                    * The states of Alabama andKertucky ere outliers at 10.69% and 10.5
                                                                               Chloromethane Occurrence in URCIS

                                                                                   Statesnotin Cross-Section
                                                                                   No Data for Chloromethane
                                                                                   0.00% PWSs > Detection Limit
                                                                                   0.01 - 2.00% PWSs > Detection Limit
                                                                                   2.00 - 5.00%PWSs> Detection Limit*
                                                 SDWIS/FED (Round 2) Cross-Section States
                     *Three states are outliers: Arkansas a 119.66%; Kentucky at 2
                     North Dakota at 39.19% PWSs > the Detection Limit
Chloromethane Occurrence inSDWIS/FED

E    Statesnotin Cross-Section
    No Data for Chloromethane
    0.00% PWSs > Detection Limit
    0.01 - 2.00% PWSs > Detection Limit
    2.00 - 5.00%PWSs> Detection Limit*

-------
                 EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.S.d.  Chloromethane Occurrence By Year (1984 - 1997)
              3.0%

              2.5%

              2.0%

              1.5%

              1.0%

              0.5%

              0.0%
                                    Percent PWSs > Detection Limit
                     1984  1985  1986 1987 1988 1989 1990 1991 1992 1992 1993 1994 1995 1996 1997


1.470
1.270
1.0% •
0.8%
U.O70
U.4%
0.2%
Percent PWSs













>MCL



















n






n n .. n
^M n
1984 1985 1986 1987 1988 1989 1990 1991 1992 1992 1993 1994 1995 1996 1997
The vertical line in both graphs, located between the 1992 listings, marks the division between Round 1 data (for years less than and
equal to 1992) to the left of the line, and Round 2 data (for years greater than and equal to 1992) to the right.
                                                     89

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               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.S.e. Occurrence of Chloromethane By State - URCIS (Round 1) and SDWIS/FED
(Round 2)
                  AK
                             Percent PWSs > Detection Limit
KY
MD     MN
        NC
        NM
        OH
       WA
                                     D Round 1
                           • Round 2
           7%


           6%


           5%


           4%


           3%


           2%


           1%
                 AK
                                      Percent PWSs >MCL
KY
MD
MN
NC
NM
OH
WA
                                      D Round 1
                       I Round 2
                                              90

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                EPA - OGWDW    Occurrence of Unregulated Contaminants in Public Water Systems
VI.B.9.   Chloroform

        Chloroform is evaluated graphically only in Figures VI.B.9.a and VI.B.9.b.  Occurrence for
chloroform, as is typical of the THMs, is relatively high based on the percent of systems with analytical
detections (see the upper graphs in both Figure VI.B.9.a and b).  In contrast, the occurrence of
chloroform in public water systems greater than the HRL are relatively low (lower graphs of Figure
VI.B.9.a and b).  Also in Figure VI.B.9.b, when comparing chloroform occurrence in Round 1  to Round 2
in the same states, it appears that occurrence has increased from Round 1 to Round 2.

Figure VI.B.9.a. Chloroform Occurrence By Year (1984 - 1997)


60% '











n
P

ercent PWSs > Detection Limit












-






i-i




_rjlnr,nn

1984 1985 1986 1987 1988 1989 1990 1991 1992 1992 1993 1994 1995 1996 1997
Percent PWSs


0.05% '

0.03% "

0.01% '
>HRL

































—





1984 1985 1986 1987 1988 1989 1990 1991 1992 1992 1993 1994 1995 1996 1997
The vertical line in both graphs, located between the 1992 listings, marks the division between Round 1 data (for years less than and
equal to 1992) to the left of the line, and Round 2 data (for years greater than and equal to 1992) to the right.
                                                  91

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               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
Figure VI.B.9.b.  Occurrence of Chloroform By State - URCIS (Round 1) and SDWIS/FED
(Round 2)
          100%
                              Percent PWSs > Detection Limit
                  AK      KY     MD      MN      NC      NM      OH     WA
                                   D Round 1
I Round 2
          0.4%
          0.3%
          0.2%
                                   Percent PWSs >HRL
                                    D Round 1
 I Round 2
                  AK      KY     MD     MN      NC      NM     OH     WA
                                             92

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               EPA - OGWDW   Occurrence of Unregulated Contaminants in Public Water Systems
VLB. 10. Comparison of Occurrence in URCIS (Round 1) and SDWIS/FED (Round 2)

       Figure VI.B.lO.a shows occurrence findings for these three contaminants: chloromethane, 1,1-
dichloroethane, and chloroform. No trend between URCIS (Round 1) and SDWIS/FED (Round 2)
findings is distinct or apparent.  (The differences between occurrence based on MRL versus the
HRL/MCL are due, in part, to the relative values of each contaminant's MRL and HRL/MCL. Often
when a contaminant has a very low HRL/MCL, close to its MRL, a large portion of analytical detections
are at concentrations that also exceed the relatively low HRL/MCL value.)

Figure VI.B.lO.a. Occurrence in URCIS (Round 1) and SDWIS/FED (Round 2)
                             Occurrence Based on Detection Limit
                         Chloromethane
                                           1,1 -Dichloroethane
                                                                 Chloroform
                                 D Round 1
I Round 2
                 0.7%
                              Occurrence Based on MCL/HRL
                          Chloromethane
                                             1,1-Dichloroethane
                                                                   Chloroform
                                     DRound 1
                                                 Round 2
                                              93

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APPENDICES

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          Appendix A.  URCIS (Round 1) Data Summary

Table A. 1 .a   URCIS (Round 1) Data - Dibromochloropropane Occurrence in Public Water
             Systems
Table A. 1 .b   URCIS (Round 1) Data - Dibromochloropropane Occurrence in Public Water
             Systems - Based on Number of Samples
Table A. 1 .c   URCIS (Round 1) Data - Dibromochloropropane Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.2.a   URCIS (Round 1) Data - Ethylene Dibromide Occurrence in Public Water
             Systems
Table A.2.b   URCIS (Round 1) Data - Ethylene Dibromide Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.2.C   URCIS (Round 1) Data - Ethylene Dibromide Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.3.a   URCIS (Round 1) Data - Benzene Occurrence in Public Water Systems
Table A.3.b   URCIS (Round 1) Data - Benzene Occurrence in Public Water Systems -
             Based on Number of Samples
Table A.3.c   URCIS (Round 1) Data - Benzene Occurrence in Public Water Systems -
             Based on Number of Systems

Table A.4.a   URCIS (Round 1) Data - Bromobenzene Occurrence in Public Water Systems
Table A.4.b   URCIS (Round 1) Data - Bromobenzene Occurrence in Public Water Systems
             - Based on Number of Samples
Table A.4.c   URCIS (Round 1) Data - Bromobenzene Occurrence in Public Water Systems
             - Based on Number of Systems

Table A.5.a   URCIS (Round 1) Data - Bromochloromethane Occurrence in Public Water
             Systems
Table A.S.b   URCIS (Round 1) Data - Bromochloromethane Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.S.c   URCIS (Round 1) Data - Bromochloromethane Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.6.a   URCIS (Round 1) Data - Bromodichloromethane Occurrence in Public Water
             Systems
Table A.6.b   URCIS (Round 1) Data - Bromodichloromethane Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.6.c   URCIS (Round 1) Data - Bromodichloromethane Occurrence in Public Water
             Systems - Based on Number of Systems

-------
Table A.7.a   URCIS (Round 1) Data - Bromoform Occurrence in Public Water Systems
Table A.7.b   URCIS (Round 1) Data - Bromoform Occurrence in Public Water Systems -
             Based on Number of Samples
Table A.7.c   URCIS (Round 1) Data - Bromoform Occurrence in Public Water Systems -
             Based on Number of Systems

Table A.8.a   URCIS (Round 1) Data - Bromomethane Occurrence in Public Water Systems
Table A.S.b   URCIS (Round 1) Data - Bromomethane Occurrence in Public Water Systems
             - Based on Number of Samples
Table A.S.c   URCIS (Round 1) Data - Bromomethane Occurrence in Public Water Systems
             - Based on Number of Systems

Table A.9.a   URCIS (Round 1) Data - Carbon Tetrachloride Occurrence in Public Water
             Systems
Table A.9.b   URCIS (Round 1) Data - Carbon Tetrachloride Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.9.c   URCIS (Round 1) Data - Carbon Tetrachloride Occurrence in Public Water
             Systems - Based on Number of Systems

Table A. 10.a  URCIS (Round 1) Data - Chlorobenzene Occurrence in Public Water Systems
Table A. lO.b  URCIS (Round 1) Data - Chlorobenzene Occurrence in Public Water Systems
             - Based on Number of Samples
Table A. 10.c  URCIS (Round 1) Data - Chlorobenzene Occurrence in Public Water Systems
             - Based on Number of Systems

Table A. 11 .a  URCIS (Round 1) Data - Chloroethane Occurrence in Public Water Systems
Table A. 11 .b  URCIS (Round 1) Data - Chloroethane Occurrence in Public Water Systems -
             Based on Number of Samples
Table A. 11 .c  URCIS (Round 1) Data - Chloroethane Occurrence in Public Water Systems -
             Based on Number of Systems

Table A. 12.a  URCIS (Round 1) Data - Chloroform Occurrence in Public Water Systems
Table A. 12.b  URCIS (Round 1) Data - Chloroform Occurrence in Public Water Systems -
             Based on Number of Samples
Table A. 12.c  URCIS (Round 1) Data - Chloroform Occurrence in Public Water Systems -
             Based on Number of Systems

Table A. 13.a  URCIS (Round 1) Data - Chloromethane Occurrence in Public Water Systems
Table A. 13.b  URCIS (Round 1) Data - Chloromethane Occurrence in Public Water Systems
             - Based on Number of Samples
Table A. 13.c  URCIS (Round 1) Data - Chloromethane Occurrence in Public Water Systems
             - Based on Number of Systems

-------
Table A. 14.a  URCIS (Round 1) Data - cis-l,2-Dichloroethene Occurrence in Public Water
             Systems
Table A. 14.b  URCIS (Round 1) Data - cis-l,2-Dichloroethene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A. 14.c  URCIS (Round 1) Data - cis-l,2-Dichloroethene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A. 15.a  URCIS (Round 1) Data - cis-l,3-Dichloropropene Occurrence in Public
             Water Systems
Table A. 15.b  URCIS (Round 1) Data - cis-l,3-Dichloropropene Occurrence in Public
             Water Systems - Based on Number of Samples
Table A. 15.c  URCIS (Round 1) Data - cis-l,3-Dichloropropene Occurrence in Public
             Water Systems - Based on Number of Systems

Table A. 16.a  URCIS (Round 1) Data - Dibromochloromethane Occurrence in Public Water
             Systems
Table A. 16.b  URCIS (Round 1) Data - Dibromochloromethane Occurrence in Public Water
             Systems - Based on Number of Samples
Table A. 16.c  URCIS (Round 1) Data - Dibromochloromethane Occurrence in Public Water
             Systems - Based on Number of Systems

Table A. 17.a  URCIS (Round 1) Data - Dibromomethane Occurrence in Public Water
             Systems
Table A. 17.b  URCIS (Round 1) Data - Dibromomethane Occurrence in Public Water
             Systems - Based on Number of Samples
Table A. 17.c  URCIS (Round 1) Data - Dibromomethane Occurrence in Public Water
             Systems - Based on Number of Systems

Table A. 18.a  URCIS (Round 1) Data - Dichlorodifluoromethane Occurrence in Public
             Water Systems
Table A. 18.b  URCIS (Round 1) Data - Dichlorodifluoromethane Occurrence in Public
             Water Systems - Based on Number of Samples
Table A. 18.c  URCIS (Round 1) Data - Dichlorodifluoromethane Occurrence in Public
             Water Systems - Based on Number of Systems

Table A. 19.a  URCIS (Round 1) Data -1,1-Dichloroethane Occurrence in Public Water
             Systems
Table A. 19.b  URCIS (Round 1) Data -1,1-Dichloroethane Occurrence in Public Water
             Systems - Based on Number of Samples
Table A. 19.c  URCIS (Round 1) Data -1,1-Dichloroethane Occurrence in Public Water
             Systems - Based on Number of Systems

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Table A.20.a  URCIS (Round 1) Data - 1,2-Dichloroethane Occurrence in Public Water
             Systems
Table A.20.b  URCIS (Round 1) Data - 1,2-Dichloroethane Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.20.C  URCIS (Round 1) Data - 1,2-Dichloroethane Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.21 .a  URCIS (Round 1) Data - Dichloroethene Occurrence in Public Water Systems
Table A.21 .b  URCIS (Round 1) Data - Dichloroethene Occurrence in Public Water Systems
             - Based on Number of Samples
Table A.21 .c  URCIS (Round 1) Data - Dichloroethene Occurrence in Public Water Systems
             - Based on Number of Systems

Table A.22.a  URCIS (Round 1) Data - Dichloromethane Occurrence in Public Water
             Systems
Table A.22.b  URCIS (Round 1) Data - Dichloromethane Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.22.C  URCIS (Round 1) Data - Dichloromethane Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.23.a  URCIS (Round 1) Data - 1,2-Dichloropropane Occurrence in Public Water
             Systems
Table A.23.b  URCIS (Round 1) Data - 1,2-Dichloropropane Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.23.C  URCIS (Round 1) Data - 1,2-Dichloropropane Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.24.a  URCIS (Round 1) Data - 1,3-Dichloropropane Occurrence in Public Water
             Systems
Table A.24.b  URCIS (Round 1) Data - 1,3-Dichloropropane Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.24.C  URCIS (Round 1) Data - 1,3-Dichloropropane Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.25.a  URCIS (Round 1) Data - 2,2-Dichloropropane Occurrence in Public Water
             Systems
Table A.25.b  URCIS (Round 1) Data - 2,2-Dichloropropane Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.25.C  URCIS (Round 1) Data - 2,2-Dichloropropane Occurrence in Public Water
             Systems - Based on Number of Systems

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Table A.26.a  URCIS (Round 1) Data - 1,1-Dichloropropene Occurrence in Public Water
             Systems
Table A.26.b  URCIS (Round 1) Data - 1,1-Dichloropropene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.26.C  URCIS (Round 1) Data - 1,1-Dichloropropene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.27.a  URCIS (Round 1) Data - 1,3- Dichloropropene Occurrence in Public Water
             Systems
Table A.27.b  URCIS (Round 1) Data - 1,3- Dichloropropene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.27.C  URCIS (Round 1) Data - 1,3- Dichloropropene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.28.a  URCIS (Round 1) Data - Ethyl Benzene Occurrence in Public Water Systems
Table A.28.b  URCIS (Round 1) Data - Ethyl Benzene Occurrence in Public Water Systems
             - Based on Number of Samples
Table A.28.C  URCIS (Round 1) Data - Ethyl Benzene Occurrence in Public Water Systems
             - Based on Number of Systems

Table A.29.a  URCIS (Round 1) Data - Hexachlorobutadiene Occurrence in Public Water
             Systems
Table A.29.b  URCIS (Round 1) Data - Hexachlorobutadiene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.29.C  URCIS (Round 1) Data - Hexachlorobutadiene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.30.a  URCIS (Round 1) Data - Isopropylbenzene Occurrence in Public Water
             Systems
Table A.30.b  URCIS (Round 1) Data - Isopropylbenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.30.C  URCIS (Round 1) Data - Isopropylbenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.31 .a  URCIS (Round 1) Data - m-Dichlorobenzene Occurrence in Public Water
             Systems
Table A. 31 .b  URCIS (Round 1) Data - m-Dichlorobenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A. 31 .c  URCIS (Round 1) Data - m-Dichlorobenzene Occurrence in Public Water
             Systems - Based on Number of Systems

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Table A.32.a  URCIS (Round 1) Data - m-Xylene Occurrence in Public Water Systems
Table A.32.b  URCIS (Round 1) Data - m-Xylene Occurrence in Public Water Systems -
             Based on Number of Samples
Table A.32.C  URCIS (Round 1) Data - m-Xylene Occurrence in Public Water Systems -
             Based on Number of Systems

Table A.33.a  URCIS (Round 1) Data - n-Butylbenzene Occurrence in Public Water Systems
Table A.33.b  URCIS (Round 1) Data - n-Butylbenzene Occurrence in Public Water Systems
             - Based on Number of Samples
Table A.33.C  URCIS (Round 1) Data - n-Butylbenzene Occurrence in Public Water Systems
             - Based on Number of Systems

Table A.34.a  URCIS (Round 1) Data - n-Propylbenzene Occurrence in Public Water
             Systems
Table A.34.b  URCIS (Round 1) Data - n-Propylbenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.34.C  URCIS (Round 1) Data - n-Propylbenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.35.a  URCIS (Round 1) Data - Naphthalene Occurrence in Public Water Systems
Table A.35.b  URCIS (Round 1) Data - Naphthalene Occurrence in Public Water Systems -
             Based on Number of Samples
Table A.35.C  URCIS (Round 1) Data - Naphthalene Occurrence in Public Water Systems -
             Based on Number of Systems

Table A.36.a  URCIS (Round 1) Data - o-Chlorotoluene Occurrence in Public Water
             Systems
Table A.36.b  URCIS (Round 1) Data - o-Chlorotoluene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.36.C  URCIS (Round 1) Data - o-Chlorotoluene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.37.a  URCIS (Round 1) Data - o-Dichlorobenzene Occurrence in Public Water
             Systems
Table A.37.b  URCIS (Round 1) Data - o-Dichlorobenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.37.C  URCIS (Round 1) Data - o-Dichlorobenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.38.a  URCIS (Round 1) Data - o-Xylene Occurrence in Public Water Systems
Table A.38.b  URCIS (Round 1) Data - o-Xylene Occurrence in Public Water Systems -
             Based on Number of Samples
Table A.38.C  URCIS (Round 1) Data - o-Xylene Occurrence in Public Water Systems -
             Based on Number of Systems

-------
Table A.39.a  URCIS (Round 1) Data - p-Chlorotoluene Occurrence in Public Water
             Systems
Table A.39.b  URCIS (Round 1) Data - p-Chlorotoluene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.39.C  URCIS (Round 1) Data - p-Chlorotoluene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.40.a  URCIS (Round 1) Data - p-Dichlorobenzene Occurrence in Public Water
             Systems
Table A.40.b  URCIS (Round 1) Data - p-Dichlorobenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.40.C  URCIS (Round 1) Data - p-Dichlorobenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.41 .a  URCIS (Round 1) Data - p-Isopropyltoluene Occurrence in Public Water
             Systems
Table A.41 .b  URCIS (Round 1) Data - p-Isopropyltoluene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.41 .c  URCIS (Round 1) Data - p-Isopropyltoluene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.42.a  URCIS (Round 1) Data - p-Xylene Occurrence in Public Water Systems
Table A.42.b  URCIS (Round 1) Data - p-Xylene Occurrence in Public Water Systems -
             Based on Number of Samples
Table A.42.C  URCIS (Round 1) Data - p-Xylene Occurrence in Public Water Systems -
             Based on Number of Systems

Table A.43.a  URCIS (Round 1) Data - sec-Butylbenzene Occurrence in Public Water
             Systems
Table A.43.b  URCIS (Round 1) Data - sec-Butylbenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.43.C  URCIS (Round 1) Data - sec-Butylbenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.44.a  URCIS (Round 1) Data - Styrene Occurrence in Public Water Systems
Table A.44.b  URCIS (Round 1) Data - Styrene Occurrence in Public Water Systems -
             Based on Number of Samples
Table A.44.C  URCIS (Round 1) Data - Styrene Occurrence in Public Water Systems -
             Based on Number of Systems

-------
Table A.45.a  URCIS (Round 1) Data - tert-Butylbenzene Occurrence in Public Water
             Systems
Table A.45.b  URCIS (Round 1) Data - tert-Butylbenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.45.C  URCIS (Round 1) Data - tert-Butylbenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.46.a  URCIS (Round 1) Data - 1,1,1,2-Tetrachloroethane Occurrence in Public
             Water Systems
Table A.46.b  URCIS (Round 1) Data - 1,1,1,2-Tetrachloroethane Occurrence in Public
             Water Systems - Based on Number of Samples
Table A.46.C  URCIS (Round 1) Data - 1,1,1,2-Tetrachloroethane Occurrence in Public
             Water Systems - Based on Number of Systems

Table A.47.a  URCIS (Round 1) Data -1,1,2,2-Tetrachloroethane Occurrence in Public
             Water Systems
Table A.47.b  URCIS (Round 1) Data -1,1,2,2-Tetrachloroethane Occurrence in Public
             Water Systems - Based on Number of Samples
Table A.47.C  URCIS (Round 1) Data -1,1,2,2-Tetrachloroethane Occurrence in Public
             Water Systems - Based on Number of Systems

Table A.48.a  URCIS (Round 1) Data - Tetrachloroethylene Occurrence in Public Water
             Systems
Table A.48.b  URCIS (Round 1) Data - Tetrachloroethylene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.48.C  URCIS (Round 1) Data - Tetrachloroethylene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.49.a  URCIS (Round 1) Data - Toluene Occurrence in Public Water Systems
Table A.49.b  URCIS (Round 1) Data - Toluene Occurrence in Public Water Systems -
             Based on Number of Samples
Table A.49.C  URCIS (Round 1) Data - Toluene Occurrence in Public Water Systems -
             Based on Number of Systems

Table A.SO.a  URCIS (Round 1) Data - trans-1,2-Dichloroethene Occurrence in Public
             Water Systems
Table A.SO.b  URCIS (Round 1) Data - trans-1,2-Dichloroethene Occurrence in Public
             Water Systems - Based on Number of Samples
Table A.SO.c  URCIS (Round 1) Data - trans-1,2-Dichloroethene Occurrence in Public
             Water Systems - Based on Number of Systems

-------
Table A. 51. a  URCIS (Round 1) Data - trans-1,3 -Dichloropropene Occurrence in Public
             Water Systems
Table A. 51 .b  URCIS (Round 1) Data - trans-1,3-Dichloropropene Occurrence in Public
             Water Systems - Based on Number of Samples
Table A. 51. c  URCIS (Round 1) Data - trans-1,3 -Dichloropropene Occurrence in Public
             Water Systems - Based on Number of Systems

Table A.52.a  URCIS (Round 1) Data - 1,2,3-Trichlorobenzene Occurrence in Public Water
             Systems
Table A.52.b  URCIS (Round 1) Data - 1,2,3-Trichlorobenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.52.C  URCIS (Round 1) Data - 1,2,3-Trichlorobenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.53.a  URCIS (Round 1) Data - 1,2,4-Trichlorobenzene Occurrence in Public Water
             Systems
Table A.53.b  URCIS (Round 1) Data - 1,2,4-Trichlorobenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.53.C  URCIS (Round 1) Data - 1,2,4-Trichlorobenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.54.a  URCIS (Round 1) Data - 1,1,1-Trichloroethane Occurrence in Public Water
             Systems
Table A.54.b  URCIS (Round 1) Data - 1,1,1-Trichloroethane Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.54.C  URCIS (Round 1) Data - 1,1,1-Trichloroethane Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.55.a  URCIS (Round 1) Data - 1,1,2-Trichloroethane Occurrence in Public Water
             Systems
Table A. 5 5 .b  URCIS (Round 1) Data -1,1,2-Trichloroethane Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.55.C  URCIS (Round 1) Data - 1,1,2-Trichloroethane Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.56.a  URCIS (Round 1) Data - Trichloroethylene Occurrence in Public Water
             Systems
Table A.56.b  URCIS (Round 1) Data - Trichloroethylene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.56.C  URCIS (Round 1) Data - Trichloroethylene Occurrence in Public Water
             Systems - Based on Number of Systems

-------
Table A.57.a  URCIS (Round 1) Data - Trichlorofluoromethane Occurrence in Public Water
             Systems
Table A.57.b  URCIS (Round 1) Data - Trichlorofluoromethane Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.57.C  URCIS (Round 1) Data - Trichlorofluoromethane Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.58.a  URCIS (Round 1) Data - 1,2,3-Trichloropropane Occurrence in Public Water
             Systems
Table A.58.b  URCIS (Round 1) Data - 1,2,3-Trichloropropane Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.58.C  URCIS (Round 1) Data - 1,2,3-Trichloropropane Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.59.a  URCIS (Round 1) Data - 1,2,4-Trimethylbenzene Occurrence in Public Water
             Systems
Table A.59.b  URCIS (Round 1) Data - 1,2,4-Trimethylbenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.59.C  URCIS (Round 1) Data - 1,2,4-Trimethylbenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.60.a  URCIS (Round 1) Data - 1,3,5-Trimethylbenzene Occurrence in Public Water
             Systems
Table A.60.b  URCIS (Round 1) Data - 1,3,5-Trimethylbenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table A.60.C  URCIS (Round 1) Data - 1,3,5-Trimethylbenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table A.61 .a  URCIS (Round 1) Data - Vinyl Chloride Occurrence in Public Water Systems
Table A.61 .b  URCIS (Round 1) Data - Vinyl Chloride Occurrence in Public Water Systems
             - Based on Number of Samples
Table A.61 .c  URCIS (Round 1) Data - Vinyl Chloride Occurrence in Public Water Systems
             - Based on Number of Systems

Table A.62.a  URCIS (Round 1) Data - Xylenes (Total) Occurrence in Public Water Systems
Table A.62.b  URCIS (Round 1) Data - Xylenes (Total) Occurrence in Public Water Systems
             - Based on Number of Samples
Table A.62.C  URCIS (Round 1) Data - Xylenes (Total) Occurrence in Public Water Systems
             - Based on Number of Systems

-------
                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.1 .a  URCIS (Round 1) Data- Dibromochloropropane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
643
131

500
1,716
5
1
13
205
1,163

24

335
524
13
5
983

1,553
58

562
297


99
594
6
252
2,656
335
193
3
34
3


135
145

13,186

12,827
# GW
PWS
522
93

452
1,639
4
0
11
42
1,054

22

297
291
9
4
936

1,529
45

520
254


88
561
5
196
2,493
306
139
1
30



62
116

1 1 ,721

1 1 ,446
# SW PWS
126
42

64
125
2
1
2
181
109

2

39
233
4
1
50

28
13

57
44


11
33
1
65
167
29
54
2
5
3


74
38

1,605

1,511
% PWS
>MRL
0.00%
10.69%

1 .60%
14.28%
40.00%
0.00%
7.69%
5.37%
1 .55%

0.00%

0.30%
0.19%
0.00%
100.00%
0.00%

0.00%
0.00%

0.00%
2.02%


6.06%
0.17%
0.00%
1.19%
0.04%
0.60%
2.59%
66.67%
0.00%
100.00%


0.00%
0.00%

2.54%

2.49%
%GW
PWS
>MRL
0.00%
12.90%

1.11%
14.83%
25.00%
0.00%
9.09%
7.14%
0.85%

0.00%

0.34%
0.00%
0.00%
100.00%
0.00%

0.00%
0.00%

0.00%
1 .57%


4.55%
0.18%
0.00%
1 .53%
0.04%
0.65%
1 .44%
100.00%
0.00%
0.00%


0.00%
0.00%

2.53%

2.51%
%sw
PWS
>MRL
0.00%
4.76%

4.69%
4.00%
50.00%
0.00%
0.00%
4.42%
8.26%

0.00%

0.00%
0.43%
0.00%
100.00%
0.00%

0.00%
0.00%

0.00%
4.55%


18.18%
0.00%
0.00%
0.00%
0.00%
0.00%
5.56%
50.00%
0.00%
100.00%


0.00%
0.00%

2.55%

2.32%
% PWS
>MCL
0.00%
4.58%

0.80%
8.10%
0.00%
0.00%
7.69%
3.41%
0.43%

0.00%

0.00%
0.00%
0.00%
20.00%
0.00%

0.00%
0.00%

0.00%
1 .35%


1.01%
0.17%
0.00%
0.79%
0.00%
0.30%
0.52%
33.33%
0.00%
0.00%


0.00%
0.00%

1 .32%

1 .32%
%GW
PWS
>MCL
0.00%
5.38%

0.66%
8.48%
0.00%
0.00%
9.09%
2.38%
0.19%

0.00%

0.00%
0.00%
0.00%
25.00%
0.00%

0.00%
0.00%

0.00%
1.18%


0.00%
0.18%
0.00%
1 .02%
0.00%
0.33%
0.00%
100.00%
0.00%
0.00%


0.00%
0.00%

1 .37%

1 .35%
%sw
PWS
>MCL
0.00%
2.38%

1 .56%
0.80%
0.00%
0.00%
0.00%
3.31%
2.75%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
2.27%


9.09%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .85%
0.00%
0.00%
0.00%


0.00%
0.00%

0.93%

0.99%
99%
VALUE
(M9/L)
< 0.00
1.14

0.20
1.90
0.90
< 0.50
< 2.00
1.00
0.20

< 0.60

< 2.00
< 1.00
< 0.50
6.00
< 0.50

< 2.00
< 20.00

< 1.00
0.17


0.15
< 1.00
< 0.01
< 5.00
< 2.00
< 0.50
0.20
0.80
< 50.00
0.20


< 5.00
< 2.00

1.00

1.03
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Dibromochloropropane is 0.2 |jg/L.
The highlighted States are part of the  URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.1.b  URCIS (Round 1) Data- Dibromochloropropane Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
643
131

500
1,716
5
1
13
205
1,163

24

335
524
13
5
983

1,553
58

562
297


99
594
6
252
2,656
335
193
3
34
3


135
145

13,186

12,827
TOTAL #
SAMPLES
1,496
351

1,491
17,461
38
47
339
284
2,460

91

2,006
2,311
22
5
1,747

2,656
166

1,611
644


297
1,239
49
1,157
16,086
444
333
3
62
10


379
313

55,598

53,762
#GW
SAMPLES
1,241
244

1,073
16,913
34
0
195
65
1,862

64

1,529
1,172
18
4
1,375

2,588
142

1,368
569


213
1,161
45
932
15,167
363
189
1
53
0


161
259

49,000

47,629
#SW
SAMPLES
255
107

418
548
4
47
144
219
598

27

477
1,139
4
1
372

68
24

243
75


84
78
4
225
919
81
144
2
9
10


218
54

6,598

6,133
% TOTAL
SAMPLES
>MRL
0.00%
5.41%

1 .95%
32.83%
55.26%
0.00%
0.59%
3.87%
5.57%

0.00%

0.10%
0.04%
0.00%
100.00%
0.00%

0.00%
0.00%

0.00%
2.48%


2.02%
0.08%
0.00%
0.35%
0.01%
0.45%
1 .50%
66.67%
0.00%
100.00%


0.00%
0.00%

10.80%

1 1 .09%
%GW
SAMPLES
>MRL
0.00%
6.56%

0.93%
33.83%
55.88%
0.00%
1 .03%
4.62%
6.71%

0.00%

0.13%
0.00%
0.00%
100.00%
0.00%

0.00%
0.00%

0.00%
2.28%


1 .88%
0.09%
0.00%
0.43%
0.01%
0.55%
1 .06%
100.00%
0.00%
0.00%


0.00%
0.00%

12.10%

12.39%
%SW
SAMPLES
>MRL
0.00%
2.80%

4.55%
2.01%
50.00%
0.00%
0.00%
3.65%
2.01%

0.00%

0.00%
0.09%
0.00%
100.00%
0.00%

0.00%
0.00%

0.00%
4.00%


2.38%
0.00%
0.00%
0.00%
0.00%
0.00%
2.08%
50.00%
0.00%
100.00%


0.00%
0.00%

1.15%

1.01%
MIN VALUE
(M9/L)
< 0.00
< 0.02

< 0.00
< 0.00
< 0.00
< 0.50
< 0.02
< 0.00
< 0.02

< 0.02

< 0.01
< 0.01
< 0.02
0.02
< 0.20

< 0.20
< 0.02

< 0.05
< 0.02


< 0.02
< 0.00
< 0.01
< 0.01
< 0.00
< 0.15
< 0.02
< 0.00
< 0.10
0.02


< 0.02
< 0.80

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
1.14

0.20
1.90
0.90
< 0.50
< 2.00
1.00
0.20

< 0.60

< 2.00
< 1.00
< 0.50
6.00
< 0.50

< 2.00
< 20.00

< 1.00
0.17


0.15
< 1.00
< 0.01
< 5.00
< 2.00
< 0.50
0.20
0.80
< 50.00
0.20


< 5.00
< 2.00

1.00

1.03
MAX
VALUE
(M9/L)
< 0.00
478.00

10.00
116.00
0.09
< 0.50
35.10
2.50
0.50

< 0.60

0.13
0.08
< 0.50
6.00
< 1.00

< 20.00
< 20.00

< 1.00
2.90


0.50
6.73
0.01
0.26
0.03
0.57
0.50
0.80
< 50.00
0.02


< 5.00
< 2.00

478.00

478.00
MIN
DETECTS
(M9/L)

0.02

0.02
0.01
0.03

10.00
0.01
0.02



0.13
0.08

0.02






0.02


0.08
6.73

0.04
0.03
0.15
0.02
0.01

0.02





0.01

0.01
MEDIAN
DETECTS
(M9/L)

0.15

0.02
0.16
0.06

22.55
0.80
0.02



0.13
0.08

0.06






0.13


0.13
6.73

0.17
0.03
0.36
0.03
0.41

0.02





0.15

0.15
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                               Occurrence of Unregulated Contaminants in Public Water Systems
Table A.1.C  URCIS (Round 1) Data- Dibromochloropropane Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,496
351

1,491
17,461
38
47
339
284
2,460

91

2,006
2,311
22
5
1,747

2,656
166

1,611
644


297
1,239
49
1,157
16,086
444
333
3
62
10


379
313

55,598

53,762
TOTAL
UNIQUE
PWS
643
131

500
1,716
5
1
13
205
1,163

24

335
524
13
5
983

1,553
58

562
297


99
594
6
252
2,656
335
193
3
34
3


135
145

13,186

12,827
#GW
PWS
522
93

452
1,639
4
0
11
42
1,054

22

297
291
9
4
936

1,529
45

520
254


88
561
5
196
2,493
306
139
1
30
0


62
116

11,721

11,446
# SW PWS
126
42

64
125
2
1
2
181
109

2

39
233
4
1
50

28
13

57
44


11
33
1
65
167
29
54
2
5
3


74
38

1,605

1,511
% PWS
>MRL
0.00%
10.69%

1 .60%
14.28%
40.00%
0.00%
7.69%
5.37%
1 .55%

0.00%

0.30%
0.19%
0.00%
100.00%
0.00%

0.00%
0.00%

0.00%
2.02%


6.06%
0.17%
0.00%
1.19%
0.04%
0.60%
2.59%
66.67%
0.00%
100.00%


0.00%
0.00%

2.54%

2.49%
%GW
PWS
>MRL
0.00%
12.90%

1.11%
14.83%
25.00%
0.00%
9.09%
7.14%
0.85%

0.00%

0.34%
0.00%
0.00%
100.00%
0.00%

0.00%
0.00%

0.00%
1 .57%


4.55%
0.18%
0.00%
1 .53%
0.04%
0.65%
1 .44%
100.00%
0.00%
0.00%


0.00%
0.00%

2.53%

2.51%
%sw
PWS
>MRL
0.00%
4.76%

4.69%
4.00%
50.00%
0.00%
0.00%
4.42%
8.26%

0.00%

0.00%
0.43%
0.00%
100.00%
0.00%

0.00%
0.00%

0.00%
4.55%


18.18%
0.00%
0.00%
0.00%
0.00%
0.00%
5.56%
50.00%
0.00%
100.00%


0.00%
0.00%

2.55%

2.32%
% PWS
> 1/2 MCL
0.00%
5.34%

1 .00%
9.44%
0.00%
0.00%
7.69%
3.41%
0.52%

0.00%

0.30%
0.00%
0.00%
40.00%
0.00%

0.00%
0.00%

0.00%
1 .35%


4.04%
0.17%
0.00%
0.79%
0.00%
0.60%
0.52%
33.33%
0.00%
0.00%


0.00%
0.00%

1 .56%

1 .56%
%GW
PWS
> 1/2 MCL
0.00%
6.45%

0.88%
9.88%
0.00%
0.00%
9.09%
2.38%
0.28%

0.00%

0.34%
0.00%
0.00%
25.00%
0.00%

0.00%
0.00%

0.00%
1.18%


2.27%
0.18%
0.00%
1 .02%
0.00%
0.65%
0.00%
100.00%
0.00%
0.00%


0.00%
0.00%

1 .62%

1 .62%
%sw
PWS
> 1/2 MCL
0.00%
2.38%

1 .56%
1 .60%
0.00%
0.00%
0.00%
3.31%
2.75%

0.00%

0.00%
0.00%
0.00%
100.00%
0.00%

0.00%
0.00%

0.00%
2.27%


18.18%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .85%
0.00%
0.00%
0.00%


0.00%
0.00%

1.12%

1.13%
% PWS
>MCL
0.00%
4.58%

0.80%
8.10%
0.00%
0.00%
7.69%
3.41%
0.43%

0.00%

0.00%
0.00%
0.00%
20.00%
0.00%

0.00%
0.00%

0.00%
1 .35%


1.01%
0.17%
0.00%
0.79%
0.00%
0.30%
0.52%
33.33%
0.00%
0.00%


0.00%
0.00%

1 .32%

1 .32%
%GW
PWS
>MCL
0.00%
5.38%

0.66%
8.48%
0.00%
0.00%
9.09%
2.38%
0.19%

0.00%

0.00%
0.00%
0.00%
25.00%
0.00%

0.00%
0.00%

0.00%
1.18%


0.00%
0.18%
0.00%
1 .02%
0.00%
0.33%
0.00%
100.00%
0.00%
0.00%


0.00%
0.00%

1 .37%

1 .35%
%sw
PWS
>MCL
0.00%
2.38%

1 .56%
0.80%
0.00%
0.00%
0.00%
3.31%
2.75%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
2.27%


9.09%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .85%
0.00%
0.00%
0.00%


0.00%
0.00%

0.93%

0.99%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy
The Maximum Contaminant Level (MCL) for Dibromochloropropane is 0.2 [ig/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.2.a URCIS (Round 1) Data- Ethylene Dibromide Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
642
131

499
1,512
5
1
13

1,163

23

335
524
13
7

1
1,565
57

562
297


98
594
6
283
2,655
335
200
5
33
3


137
145

1 1 ,844

1 1 ,450
# GW
PWS
521
93

452
1,432
3
0
11

1,054

22

297
291
9
5

1
1,540
44

520
254


87
561
5
217
2,492
306
144
1
29
0


63
116

10,570

10,274
# SW PWS
126
42

64
126
2
1
2

109

1

39
233
4
2

0
29
13

57
44


11
33
1
79
167
29
56
4
5
3


75
38

1,395

1,284
% PWS
>MRL
0.00%
1 1 .45%

1 .00%
3.11%
0.00%
0.00%
0.00%

1 .72%

0.00%

1 .79%
0.19%
0.00%
100.00%

100.00%
0.06%
0.00%

0.00%
4.38%


4.08%
0.00%
0.00%
1.41%
0.19%
0.00%
5.50%
60.00%
3.03%
100.00%


0.73%
0.00%

1 .25%

1.14%
%GW
PWS
>MRL
0.00%
13.98%

0.44%
3.28%
0.00%
0.00%
0.00%

0.95%

0.00%

1 .35%
0.34%
0.00%
100.00%

100.00%
0.06%
0.00%

0.00%
4.72%


2.30%
0.00%
0.00%
1 .38%
0.20%
0.00%
4.86%
100.00%
0.00%
0.00%


0.00%
0.00%

1 .08%

1.01%
%sw
PWS
>MRL
0.00%
4.76%

4.69%
0.79%
0.00%
0.00%
0.00%

9.17%

0.00%

5.13%
0.00%
0.00%
100.00%

0.00%
0.00%
0.00%

0.00%
2.27%


18.18%
0.00%
0.00%
1 .27%
0.00%
0.00%
7.14%
50.00%
20.00%
100.00%


1 .33%
0.00%

2.51%

2.10%
% PWS
>MCL
0.00%
3.05%

0.20%
0.07%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
28.57%

100.00%
0.06%
0.00%

0.00%
1 .68%


1 .02%
0.00%
0.00%
0.00%
0.00%
0.00%
2.00%
0.00%
3.03%
0.00%


0.00%
0.00%

0.18%

0.16%
%GW
PWS
>MCL
0.00%
3.23%

0.00%
0.07%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
20.00%

100.00%
0.06%
0.00%

0.00%
1 .97%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .39%
0.00%
0.00%
0.00%


0.00%
0.00%

0.13%

0.12%
%sw
PWS
>MCL
0.00%
2.38%

1 .56%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
50.00%

0.00%
0.00%
0.00%

0.00%
0.00%


9.09%
0.00%
0.00%
0.00%
0.00%
0.00%
3.57%
0.00%
20.00%
0.00%


0.00%
0.00%

0.50%

0.47%
99%
VALUE
(M9/L)
< 0.00
2.00

< 5.00
0.40
< 1.00
< 0.50
< 2.00

0.20

< 200.00

< 4.00
< 1.00
< 0.50
53.00

4.00
< 1.00
< 2.00

< 1.00
0.25


1.20
< 1.00
< 0.01
< 1.00
< 2.00
< 0.50
1.46
1.00
4.52
0.02


< 4.00
< 0.90

0.02

0.01
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Ethylene Dibromide is 0.05 |jg/L.
The highlighted States are part of the  URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.2.b  URCIS (Round 1) Data- Ethylene Dibromide Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
642
131

499
1,512
5
1
13

1,163

23

335
524
13
7

1
1,565
57

562
297


98
594
6
283
2,655
335
200
5
33
3


137
145

1 1 ,844

11,450
TOTAL #
SAMPLES
1,478
351

1,442
13,351
21
46
339

2,463

90

2,008
2,075
22
20

7
2,757
166

1,611
644


285
1,239
49
1,607
16,081
444
371
5
59
10


383
313

49,737

47,445
#GW
SAMPLES
1,227
244

1,051
12,832
18
0
195

1,864

64

1,531
1,119
18
18

7
2,678
142

1,368
569


207
1,161
45
1,269
15,162
363
218
1
50
0


163
259

43,843

42,130
#SW
SAMPLES
251
107

391
519
3
46
144

599

26

477
956
4
2

0
79
24

243
75


78
78
4
338
919
81
153
4
9
10


220
54

5,894

5,315
% TOTAL
SAMPLES
>MRL
0.00%
9.40%

0.35%
1 .75%
0.00%
0.00%
0.00%

5.68%

0.00%

0.90%
0.05%
0.00%
100.00%

100.00%
0.04%
0.00%

0.00%
2.64%


2.11%
0.00%
0.00%
0.31%
0.03%
0.00%
3.50%
60.00%
1.69%
100.00%


0.26%
0.00%

1 .05%

1.00%
%GW
SAMPLES
>MRL
0.00%
12.30%

0.19%
1 .82%
0.00%
0.00%
0.00%

6.81%

0.00%

0.91%
0.09%
0.00%
100.00%

100.00%
0.04%
0.00%

0.00%
2.81 %


0.97%
0.00%
0.00%
0.32%
0.03%
0.00%
3.21%
100.00%
0.00%
0.00%


0.00%
0.00%

1 .07%

1.04%
%SW
SAMPLES
>MRL
0.00%
2.80%

0.77%
0.19%
0.00%
0.00%
0.00%

2.17%

0.00%

0.84%
0.00%
0.00%
100.00%

0.00%
0.00%
0.00%

0.00%
1 .33%


5.13%
0.00%
0.00%
0.30%
0.00%
0.00%
3.92%
50.00%
11.11%
100.00%


0.45%
0.00%

0.88%

0.70%
MIN VALUE
(M9/L)
< 0.00
< 0.02

< 0.00
< 0.00
< 0.02
< 0.50
< 0.01

0.00

< 0.02

< 0.00
< 0.01
< 0.02
0.02

1.00
< 0.10
< 0.02

< 0.05
< 0.02


< 0.02
< 0.00
< 0.01
< 0.02
< 0.02
< 0.50
< 0.00
< 0.00
< 0.04
0.02


< 0.00
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
2.00

< 5.00
0.40
< 1.00
< 0.50
< 2.00

0.20

< 200.00

< 4.00
< 1.00
< 0.50
53.00

4.00
< 1.00
< 2.00

< 1.00
0.25


1.20
< 1.00
< 0.01
< 1.00
< 2.00
< 0.50
1.46
1.00
4.52
0.02


< 4.00
< 0.90

0.02

0.01
MAX VALUE
(M9/L)
< 0.00
1 ,030.00

2.00
1.10
< 1.00
< 0.50
< 2.00

0.50

< 200.00

0.65
0.06
< 0.50
53.00

4.00
3.90
< 2.00

< 1.00
30.80


2.00
< 1.00
< 0.01
0.64
0.36
< 0.50
7.14
1.00
4.52
0.02


0.90
< 1.00

1 ,030.00

1 ,030.00
MIN
DETECTS
(M9/L)

0.02

0.01
0.01




0.02



0.05
0.06

0.02

1.00
3.90



0.03


0.06


0.07
0.05

0.02
0.02
4.52
0.02


0.90


0.01

0.01
MEDIAN
DETECTS
(M9/L)

0.16

0.02
0.04




0.02



0.17
0.06

0.15

2.00
3.90



0.12


0.89


0.35
0.09

0.16
0.05
4.52
0.02


0.90


0.04

0.04
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (1
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.2.C  URCIS (Round 1) Data- Ethylene Dibromide Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,478
351

1,442
13,351
21
46
339

2,463

90

2,008
2,075
22
20

7
2,757
166

1,611
644


285
1,239
49
1,607
16,081
444
371
5
59
10


383
313

49,737

47,445
TOTAL
UNIQUE
PWS
642
131

499
1,512
5
1
13

1,163

23

335
524
13
7

1
1,565
57

562
297


98
594
6
283
2,655
335
200
5
33
3


137
145

11,844

11,450
#GW
PWS
521
93

452
1,432
3
0
11

1,054

22

297
291
9
5

1
1,540
44

520
254


87
561
5
217
2,492
306
144
1
29
0


63
116

10,570

10,274
#SW
PWS
126
42

64
126
2
1
2

109

1

39
233
4
2

0
29
13

57
44


11
33
1
79
167
29
56
4
5
3


75
38

1,395

1,284
% PWS
>MRL
0.00%
11.45%

1.00%
3.11%
0.00%
0.00%
0.00%

1.72%

0.00%

1.79%
0.19%
0.00%
100.00%

100.00%
0.06%
0.00%

0.00%
4.38%


4.08%
0.00%
0.00%
1.41%
0.19%
0.00%
5.50%
60.00%
3.03%
100.00%


0.73%
0.00%

1.25%

1.14%
%GW
PWS
>MRL
0.00%
13.98%

0.44%
3.28%
0.00%
0.00%
0.00%

0.95%

0.00%

1 .35%
0.34%
0.00%
100.00%

100.00%
0.06%
0.00%

0.00%
4.72%


2.30%
0.00%
0.00%
1 .38%
0.20%
0.00%
4.86%
100.00%
0.00%
0.00%


0.00%
0.00%

1 .08%

1 .01 %
%sw
PWS
>MRL
0.00%
4.76%

4.69%
0.79%
0.00%
0.00%
0.00%

9.17%

0.00%

5.13%
0.00%
0.00%
100.00%

0.00%
0.00%
0.00%

0.00%
2.27%


18.18%
0.00%
0.00%
1.27%
0.00%
0.00%
7.14%
50.00%
20.00%
100.00%


1.33%
0.00%

2.51%

2.10%
% PWS
> 1/2 MCL
0.00%
3.05%

0.20%
0.26%
0.00%
0.00%
0.00%

0.00%

0.00%

0.30%
0.00%
0.00%
28.57%

100.00%
0.06%
0.00%

0.00%
1 .68%


2.04%
0.00%
0.00%
0.35%
0.00%
0.00%
2.00%
20.00%
3.03%
0.00%


0.73%
0.00%

0.24%

0.21 %
%GW
PWS
> 1/2 MCL
0.00%
3.23%

0.00%
0.28%
0.00%
0.00%
0.00%

0.00%

0.00%

0.34%
0.00%
0.00%
20.00%

100.00%
0.06%
0.00%

0.00%
1.97%


1.15%
0.00%
0.00%
0.46%
0.00%
0.00%
1.39%
100.00%
0.00%
0.00%


0.00%
0.00%

0.20%

0.17%
%sw
PWS
> 1/2 MCL
0.00%
2.38%

1 .56%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
50.00%

0.00%
0.00%
0.00%

0.00%
0.00%


9.09%
0.00%
0.00%
0.00%
0.00%
0.00%
3.57%
0.00%
20.00%
0.00%


1 .33%
0.00%

0.57%

0.55%
% PWS
>MCL
0.00%
3.05%

0.20%
0.07%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
28.57%

100.00%
0.06%
0.00%

0.00%
1.68%


1.02%
0.00%
0.00%
0.00%
0.00%
0.00%
2.00%
0.00%
3.03%
0.00%


0.00%
0.00%

0.18%

0.16%
%GW
PWS
>MCL
0.00%
3.23%

0.00%
0.07%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
20.00%

100.00%
0.06%
0.00%

0.00%
1 .97%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .39%
0.00%
0.00%
0.00%


0.00%
0.00%

0.13%

0.12%
%sw
PWS
>MCL
0.00%
2.38%

1.56%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
50.00%

0.00%
0.00%
0.00%

0.00%
0.00%


9.09%
0.00%
0.00%
0.00%
0.00%
0.00%
3.57%
0.00%
20.00%
0.00%


0.00%
0.00%

0.50%

0.47%
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the

The Maximum Contaminant Level (MCL) for Ethylene Dibromide is 0.05 ug/L
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.3.a  URCIS (Round 1) Data- Benzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS

132

970
3,531
19
1
13

1,162
19


394
525
13
16
844
58
1,565
85
7

297
25

1,236
590
10
357
1,687
335

11
418
3

992
69
144

15,528

14,910
# GW
PWS

94

894
3,499
15

11

1,053
15


349
291
9
12
798
52
1,540
71
7

254
25

1,233
555
8
253
1,557
306

9
396


937
32
116

14,391

13,919
#SW
PWS

42

119
53
5
1
2

109
4


46
234
4
5
51
6
29
14


44


3
35
4
123
134
29

2
36
3

77
37
37

1,288

1,119
% PWS
>MRL

5.30%

0.31%
1 .08%
31 .58%
0.00%
7.69%

0.43%
0.00%


1 .52%
1 .90%
7.69%
81 .25%
1 .07%
100.00%
1 .92%
0.00%
100.00%

7.41%
100.00%

1 .54%
1 .02%
0.00%
1 .68%
0.18%
0.00%

100.00%
0.96%
0.00%

0.50%
0.00%
2.08%

1 .92%

1.14%
%GW
PWS
>MRL

6.38%

0.34%
1 .06%
26.67%
0.00%
9.09%

0.38%
0.00%


1 .43%
1 .03%
11.11%
75.00%
1.13%
100.00%
1 .75%
0.00%
100.00%

8.66%
100.00%

1 .54%
0.90%
0.00%
1 .98%
0.19%
0.00%

100.00%
1.01%
0.00%

0.53%
0.00%
1 .72%

1 .86%

1.11%
%sw
PWS
>MRL

2.38%

0.00%
1 .89%
40.00%
0.00%
0.00%

0.92%
0.00%


2.17%
2.99%
0.00%
100.00%
0.00%
100.00%
10.34%
0.00%
0.00%

0.00%
0.00%

0.00%
2.86%
0.00%
0.81%
0.00%
0.00%

100.00%
0.00%
0.00%

0.00%
0.00%
2.70%

2.48%

5.18%
% PWS
>MCL

1 .52%

0.00%
0.20%
0.00%
0.00%
7.69%

0.26%
0.00%


0.25%
0.57%
0.00%
31 .25%
0.00%
15.52%
0.19%
0.00%
42.86%

3.03%
28.00%

0.49%
0.51%
0.00%
0.00%
0.00%
0.00%

36.36%
0.00%
0.00%

0.10%
0.00%
0.00%

0.43%

0.25%
%GW
PWS
>MCL

2.13%

0.00%
0.20%
0.00%
0.00%
9.09%

0.19%
0.00%


0.00%
0.69%
0.00%
33.33%
0.00%
17.31%
0.19%
0.00%
42.86%

3.54%
28.00%

0.49%
0.54%
0.00%
0.00%
0.00%
0.00%

44.44%
0.00%
0.00%

0.11%
0.00%
0.00%

0.44%

0.25%
%sw
PWS
>MCL

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.92%
0.00%


2.17%
0.43%
0.00%
20.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.31%

0.27%
99% VALUE
(M9/L)

3.00

< 1.00
1.00
2.00
< 1.00
< 0.50

< 0.50
< 0.30


< 2.00
< 2.00
2.30
68.00
0.60
600.00
0.50
< 2.00
16.20

24.00
105.50

1.60
2.70
< 0.20
< 1.00
< 1.00
< 0.50

1,100.00
< 1.00
< 0.50

< 0.50
< 4.00
< 0.80

1.00

< 2.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water
Type); MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it
does not necessarily indicate an  MCL violation.  An MCL violation occurs when the MCL is exceeded by the average
results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Benzene is 5 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.3.b  URCIS (Round 1) Data- Benzene Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS

132

970
3,531
19
1
13

1,162
19


394
525
13
16
844
58
1,565
85
7

297
25

1,236
590
10
357
1,687
335

11
418
3

992
69
144

15,528

14,910
TOTAL #
SAMPLES

357

3,058
13,255
52
66
336

2,459
60


2,355
3,687
22
28
1,786
130
2,748
323
54

644
52

1,770
1,595
191
2,104
6,369
444

36
1,287
10

3,987
196
310

49,771

46,367
#GW
SAMPLES

250

2,342
12,988
47

191

1,861
33


1,802
1,406
18
20
1,306
124
2,670
297
54

569
52

1,761
1,475
155
1,566
5,754
363

34
1,172


3,656
90
259

42,315

39,757
#SW
SAMPLES

107

716
267
5
66
145

598
27


553
2,281
4
8
480
6
78
26


75


9
120
36
538
615
81

2
115
10

331
106
51

7,456

6,610
% TOTAL
SAMPLES
>MRL

3.92%

0.10%
1 .04%
21.15%
0.00%
0.60%

0.49%
0.00%


0.59%
0.62%
4.55%
85.71 %
1.06%
100.00%
1 .35%
0.00%
100.00%

9.63%
100.00%

2.03%
2.38%
0.00%
0.38%
0.05%
0.00%

100.00%
0.31%
0.00%

0.13%
0.00%
0.97%

1 .46%

0.89%
%GW
SAMPLES
>MRL

5.20%

0.13%
1 .05%
19.15%
0.00%
1 .05%

0.54%
0.00%


0.44%
0.50%
5.56%
80.00%
1.45%
100.00%
1 .27%
0.00%
100.00%

10.90%
100.00%

2.04%
2.44%
0.00%
0.45%
0.05%
0.00%

100.00%
0.34%
0.00%

0.14%
0.00%
0.77%

1 .60%

0.95%
%SW
SAMPLES
>MRL

0.93%

0.00%
0.37%
40.00%
0.00%
0.00%

0.33%
0.00%


1.08%
0.70%
0.00%
100.00%
0.00%
100.00%
3.85%
0.00%
0.00%

0.00%
0.00%

0.00%
1 .67%
0.00%
0.19%
0.00%
0.00%

100.00%
0.00%
0.00%

0.00%
0.00%
1 .96%

0.68%

0.48%
MIN VALUE
(M9/L)

< 0.50

< 0.05
< 0.00
< 0.00
< 0.50
< 0.30

< 0.50
< 0.30


< 0.10
< 0.07
< 0.50
0.08
< 0.10
1.00
< 0.10
< 0.20
0.40

< 0.43
0.20

< 0.00
< 0.00
< 0.05
< 0.02
< 0.20
< 0.50
<
0.50
< 0.00
< 0.50

< 0.50
< 0.20
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)

3.00

< 1.00
1.00
2.00
< 1.00
< 0.50

< 0.50
< 0.30


< 2.00
< 2.00
2.30
68.00
0.60
600.00
0.50
< 2.00
16.20

24.00
105.50

1.60
2.70
< 0.20
< 1.00
< 1.00
< 0.50

1,100.00
< 1.00
< 0.50

< 0.50
< 4.00
< 0.80

1.00

< 2.00
MAX VALUE
(M9/L)

7.70

3.00
1,300.00
2.00
< 1.00
13.90

221.60
< 0.30


7.57
885.00
2.30
68.00
3.10
2,270.00
20.00
< 2.00
16.20

66.10
105.50

730.00
28.30
< 0.20
1.40
3.87
< 0.50

1,100.00
2.70
< 0.50

38.00
< 4.00
1.70

2,270.00

1,300.00
MIN
DETECTS
(M9/L)

0.60

3.00
0.10
0.05

6.00

0.90



0.20
0.50
2.30
0.08
0.20
1.00
0.20

0.40

0.43
0.20

0.10
0.50

0.50
0.60


0.50
0.10


0.50

0.20

0.05

0.10
MEDIAN
DETECTS
(M9/L)

2.15

3.00
1.60
0.94

9.95

6.50



0.66
3.00
2.30
1.70
0.40
3.00
0.50

1.85

2.15
1.05

1.58
1.55

0.63
0.80


6.50
0.40


1.20

0.20

1.90

1.59
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (f
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                             Occurrence of Unregulated Contaminants in Public Water Systems
Table A.3.C URCIS (Round 1) Data- Benzene Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES

357

3,058
13,255
52
66
336

2,459
60


2,355
3,687
22
28
1,786
130
2,748
323
54

644
52

1,770
1,595
191
2,104
6,369
444

36
1,287
10

3,987
196
310

49,771

46,367
TOTAL
UNIQUE
PWS

132

970
3,531
19
1
13

1,162
19


394
525
13
16
844
58
1,565
85
7

297
25

1,236
590
10
357
1,687
335

11
418
3

992
69
144

15,528

14,910
#GW
PWS

94

894
3,499
15

11

1,053
15


349
291
9
12
798
52
1,540
71
7

254
25

1,233
555
8
253
1,557
306

9
396


937
32
116

14,391

13,919
#SW
PWS

42

119
53
5
1
2

109
4


46
234
4
5
51
6
29
14


44


3
35
4
123
134
29

2
36
3

77
37
37

1,288

1,119
% PWS
>MRL

5.30%

0.31%
1.08%
31.58%
0.00%
7.69%

0.43%
0.00%


1.52%
1.90%
7.69%
81.25%
1.07%
100.00%
1.92%
0.00%
100.00%

7.41%
100.00%

1.54%
1.02%
0.00%
1.68%
0.18%
0.00%

100.00%
0.96%
0.00%

0.50%
0.00%
2.08%

1.92%

1.14%
%GW
PWS
>MRL

6.38%

0.34%
1 .06%
26.67%
0.00%
9.09%

0.38%
0.00%


1 .43%
1 .03%
11.11%
75.00%
1.13%
100.00%
1 .75%
0.00%
100.00%

8.66%
100.00%

1 .54%
0.90%
0.00%
1 .98%
0.19%
0.00%

100.00%
1 .01 %
0.00%

0.53%
0.00%
1 .72%

1 .86%

1.11%
%sw
PWS
>MRL

2.38%

0.00%
1.89%
40.00%
0.00%
0.00%

0.92%
0.00%


2.17%
2.99%
0.00%
100.00%
0.00%
100.00%
10.34%
0.00%
0.00%

0.00%
0.00%

0.00%
2.86%
0.00%
0.81%
0.00%
0.00%

100.00%
0.00%
0.00%

0.00%
0.00%
2.70%

2.48%

5.18%
% PWS
> 1/2 MCL

2.27%

0.31 %
0.37%
0.00%
0.00%
7.69%

0.34%
0.00%


0.25%
0.95%
0.00%
43.75%
0.12%
44.83%
0.19%
0.00%
42.86%

4.04%
40.00%

0.49%
0.68%
0.00%
0.00%
0.06%
0.00%

45.45%
0.24%
0.00%

0.10%
0.00%
0.00%

0.71 %

0.39%
%GW
PWS
> 1/2 MCL

3.19%

0.34%
0.37%
0.00%
0.00%
9.09%

0.28%
0.00%


0.00%
0.69%
0.00%
33.33%
0.13%
46.15%
0.19%
0.00%
42.86%

4.72%
40.00%

0.49%
0.54%
0.00%
0.00%
0.06%
0.00%

55.56%
0.25%
0.00%

0.11%
0.00%
0.00%

0.69%

0.37%
%sw
PWS
> 1/2 MCL

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.92%
0.00%


2.17%
1 .28%
0.00%
60.00%
0.00%
33.33%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
2.86%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.85%

0.54%
% PWS
>MCL

1.52%

0.00%
0.20%
0.00%
0.00%
7.69%

0.26%
0.00%


0.25%
0.57%
0.00%
31.25%
0.00%
15.52%
0.19%
0.00%
42.86%

3.03%
28.00%

0.49%
0.51%
0.00%
0.00%
0.00%
0.00%

36.36%
0.00%
0.00%

0.10%
0.00%
0.00%

0.43%

0.25%
%GW
PWS
>MCL

2.13%

0.00%
0.20%
0.00%
0.00%
9.09%

0.19%
0.00%


0.00%
0.69%
0.00%
33.33%
0.00%
17.31%
0.19%
0.00%
42.86%

3.54%
28.00%

0.49%
0.54%
0.00%
0.00%
0.00%
0.00%

44.44%
0.00%
0.00%

0.11%
0.00%
0.00%

0.44%

0.25%
%sw
PWS
>MCL

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.92%
0.00%


2.17%
0.43%
0.00%
20.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.31%

0.27%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the
primacy States.
The Maximum Contaminant Level (MCL) for Benzene is 5 ug/L
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                       Occurrence of Unregulated Contaminants in Public Water Systems
Table A.4.a URCIS (Round 1) Data- Bromobenzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
685
132

941
150
9
1
13
112
1,163
127
805
1,301
365
524
13
1
983

1,553
78
4
565
297


1,505
590
8
357
2,655

303

420
3
1
992
137
145

16,938

16,450
# GWPWS
553
93

872
136
7
0
11
31
1,054
112
766
1,186
327
291
9
1
936

1,529
64
4
523
254


1,480
555
7
253
2,492

156

400
0
1
937
63
116

15,219

14,862
# SW PWS
137
43

105
20
3
1
2
93
109
16
39
115
39
233
4
0
50

28
14
0
57
44


25
35
2
123
167

147

34
3
0
77
75
38

1,878

1,726
% PWS
>MRL
0.44%
3.79%

0.00%
0.67%
11.11%
0.00%
0.00%
3.57%
0.00%
0.00%
0.12%
0.23%
0.00%
0.00%
0.00%
100.00%
0.00%

0.00%
0.00%
100.00%
0.00%
1 .68%


0.00%
0.00%
0.00%
0.28%
0.08%

0.00%

1 .67%
0.00%
100.00%
0.00%
0.00%
0.69%

0.24%

0.19%
% GW PWS
>MRL
0.54%
1.08%

0.00%
0.74%
14.29%
0.00%
0.00%
3.23%
0.00%
0.00%
0.13%
0.25%
0.00%
0.00%
0.00%
100.00%
0.00%

0.00%
0.00%
100.00%
0.00%
1.18%


0.00%
0.00%
0.00%
0.40%
0.08%

0.00%

1.25%
0.00%
100.00%
0.00%
0.00%
0.86%

0.19%

0.14%
% SW PWS
>MRL
0.00%
9.30%

0.00%
0.00%
0.00%
0.00%
0.00%
3.23%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
4.55%


0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

5.88%
0.00%
0.00%
0.00%
0.00%
0.00%

0.59%

0.64%
% PWS
>HRL

















% GW PWS
>HRL

















% SW PWS
>HRL

















There is no Health Reference Level
(HRL), Maximum Contaminant Level
(MCL), or Health Advisory Level (HAL)
for Bromobenzene.




























































99%
VALUE
(M9/L)
< 0.00
1.00

< 5.00
< 0.50
0.11
< 0.50
< 0.50
16.00
< 0.50
< 0.30
< 1.00
< 2.00
< 2.00
< 1.00
< 0.50
0.70
< 0.50

< 0.50
< 2.00
55.00
< 1.00
< 0.50


< 2.00
< 1.00
< 0.20
< 1.00
< 2.00

< 0.50

< 10.00
< 1.00
0.70
< 0.50
< 4.00
< 0.40

< 2.00

< 2.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum
Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                       Occurrence of Unregulated Contaminants in Public Water Systems
Table A.4.b URCIS (Round 1) Data- Bromobenzene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
685
132

941
150
9
1
13
112
1,163
127
805
1,301
365
524
13
1
983

1,553
78
4
565
297


1,505
590
8
357
2,655

303

420
3
1
992
137
145

16,938

16,450
TOTAL #
SAMPLES
1,850
352

2,879
1,067
33
62
333
155
2,463
1,221
1,211
5,996
1,935
2,310
22
1
1,754

2,657
277
4
1,623
644


3,146
1,595
148
2,566
16,085

1,222

1,319
10
1
3,987
390
313

59,631

56,174
#GW
SAMPLES
1,554
244

2,239
1,014
30
0
189
49
1,865
1,081
1,035
5,031
1,514
1,172
18
1
1,380

2,589
251
4
1,376
569


2,781
1,475
136
1,876
15,165

434

1,207
0
1
3,656
164
259

50,359

47,853
#SW
SAMPLES
296
108

640
53
3
62
144
106
598
140
176
965
421
1,138
4
0
374

68
26
0
247
75


365
120
12
690
920

788

112
10
0
331
226
54

9,272

8,321
% TOTAL
SAMPLES
>MRL
0.16%
1.70%

0.00%
0.09%
3.03%
0.00%
0.00%
2.58%
0.00%
0.00%
0.17%
0.08%
0.00%
0.00%
0.00%
100.00%
0.00%

0.00%
0.00%
100.00%
0.00%
0.78%


0.00%
0.00%
0.00%
0.04%
0.01%

0.00%

0.83%
0.00%
100.00%
0.00%
0.00%
0.32%

0.08%

0.07%
%GW
SAMPLES
>MRL
0.19%
0.41%

0.00%
0.10%
3.33%
0.00%
0.00%
2.04%
0.00%
0.00%
0.19%
0.10%
0.00%
0.00%
0.00%
100.00%
0.00%

0.00%
0.00%
100.00%
0.00%
0.53%


0.00%
0.00%
0.00%
0.05%
0.01%

0.00%

0.75%
0.00%
100.00%
0.00%
0.00%
0.39%

0.07%

0.06%
%sw
SAMPLES
>MRL
0.00%
4.63%

0.00%
0.00%
0.00%
0.00%
0.00%
2.83%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
2.67%


0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

1.79%
0.00%
0.00%
0.00%
0.00%
0.00%

0.13%

0.14%
MIN VALUE
(H9/L)
< 0.00
< 0.50

< 0.20
< 0.00
< 0.03
< 0.00
< 0.30
< 0.00
< 0.50
< 0.00
< 0.30
< 0.00
< 0.08
< 0.50
< 0.50
0.70
< 0.20

< 0.20
< 0.20
0.50
< 0.50
< 0.50


< 0.00
< 0.00
< 0.20
< 0.02
< 0.20

< 0.03

< 0.00
< 1.00
0.70
< 0.50
< 0.25
< 0.10

< 0.00

< 0.00
99% VALUE
(H9/L)
< 0.00
1.00

< 5.00
< 0.50
0.11
< 0.50
< 0.50
16.00
< 0.50
< 0.30
< 1.00
< 2.00
< 2.00
< 1.00
< 0.50
0.70
< 0.50

< 0.50
< 2.00
55.00
< 1.00
< 0.50


< 2.00
< 1.00
< 0.20
< 1.00
< 2.00

< 0.50

< 10.00
< 1.00
0.70
< 0.50
< 4.00
< 0.40

< 2.00

< 2.00
MAX VALUE
(H9/L)
1.00
21.00

< 10.00
0.20
0.11
< 0.50
< 0.60
40.00
< 0.50
< 0.30
2.40
2.00
< 5.00
< 1.00
< 0.50
0.70
< 1.00

< 2.00
< 2.00
55.00
< 1.00
7.10


< 2.00
< 5.00
< 0.20
2.40
1.00

< 0.50

2.70
< 1.00
0.70
< 0.50
< 10.00
1.00

55.00

40.00
MIN
DETECTS
(M9/L)
0.30
0.50


0.20
0.11


0.50


1.30
0.04



0.70




0.50

0.55





2.40
1.00



0.10

0.70


1.00

0.04

0.04
MEDIAN
DETECTS
(M9/L)
0.30
1.33


0.20
0.11


10.00


1.85
0.04



0.70




3.85

4.90





2.40
1.00



0.10

0.70


1.00

1.00

1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                          Occurrence of Unregulated Contaminants in Public Water Systems
Table A.4.C URCIS (Round 1) Data- Bromobenzene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL #
SAMPLES
1,850
352

2,879
1,067
33
62
333
155
2,463
1,221
1,211
5,996
1,935
2,310
22
1
1,754

2,657
277
4
1,623
644


3,146
1,595
148
2,566
16,085

1,222

1,319
10
1
3,987
390
313

59,631

56,174
TOTAL
UNIQUE
PWS
685
132

941
150
9
1
13
112
1,163
127
805
1,301
365
524
13
1
983

1,553
78
4
565
297


1,505
590
8
357
2,655

303

420
3
1
992
137
145

16,938

16,450
# GW PWS
553
93

872
136
7
0
11
31
1,054
112
766
1,186
327
291
9
1
936

1,529
64
4
523
254


1,480
555
7
253
2,492

156

400
0
1
937
63
116

15,219

14,862
# SW PWS
137
43

105
20
3
1
2
93
109
16
39
115
39
233
4
0
50

28
14
0
57
44


25
35
2
123
167

147

34
3
0
77
75
38

1,878

1,726
% PWS
>MRL
0.44%
3.79%

0.00%
0.67%
11.11%
0.00%
0.00%
3.57%
0.00%
0.00%
0.12%
0.23%
0.00%
0.00%
0.00%
100.00%
0.00%

0.00%
0.00%
100.00%
0.00%
1.68%


0.00%
0.00%
0.00%
0.28%
0.08%

0.00%

1.67%
0.00%
100.00%
0.00%
0.00%
0.69%

0.24%

0.19%
% GW PWS
>MRL
0.54%
1.08%

0.00%
0.74%
14.29%
0.00%
0.00%
3.23%
0.00%
0.00%
0.13%
0.25%
0.00%
0.00%
0.00%
100.00%
0.00%

0.00%
0.00%
100.00%
0.00%
1.18%


0.00%
0.00%
0.00%
0.40%
0.08%

0.00%

1.25%
0.00%
100.00%
0.00%
0.00%
0.86%

0.19%

0.14%
% SW PWS
>MRL
0.00%
9.30%

0.00%
0.00%
0.00%
0.00%
0.00%
3.23%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
4.55%


0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

5.88%
0.00%
0.00%
0.00%
0.00%
0.00%

0.59%

0.64%
% PWS
> 1/2 HRL

















% GW PWS
> 1/2 HRL

















% SW PWS
> 1/2 HRL

















% PWS
>HRL

















% GW PWS
>HRL

















% SW PWS
>HRL

















There is no Health Reference Level (HRL), Maximum Contaminant Level (MCL), or
Health Advisory Level (HAL) for Bromobenzene.
















































































































































PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.5.a  URCIS (Round 1) Data- Bromochloromethane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
646
131

447
151
6
1
10

1,161
127

213
357
524
13
2
983

1,549
85
1

297


809
590
8
349
2,654
335
303

410
3

992
57
145

13,359

12,881
# GW
PWS
523
93

406
138
4
0
8

1,052
112

149
321
291
9
1
936

1,525
71
1

254


798
555
7
246
2,492
306
156

390
0

937
26
116

1 1 ,923

1 1 ,576
# SW PWS
128
42

47
20
3
1
2

109
16

64
37
233
4
1
50

28
14
0

44


11
35
2
122
166
29
147

34
3

77
31
38

1,538

1,386
% PWS
>MRL
1 .39%
4.58%

0.89%
5.30%
0.00%
0.00%
0.00%

0.09%
0.00%

0.47%
0.00%
0.76%
0.00%
100.00%
0.41%

0.45%
1.18%
100.00%

0.34%


0.49%
0.17%
12.50%
0.57%
0.26%
0.00%
0.33%

1 .46%
0.00%

0.00%
0.00%
0.69%

0.54%

0.50%
%GW
PWS
>MRL
0.76%
5.38%

0.74%
5.07%
0.00%
0.00%
0.00%

0.00%
0.00%

0.67%
0.00%
1 .37%
0.00%
100.00%
0.21%

0.39%
0.00%
100.00%

0.39%


0.50%
0.00%
14.29%
0.41%
0.28%
0.00%
0.64%

1 .28%
0.00%

0.00%
0.00%
0.86%

0.46%

0.44%
%sw
PWS
>MRL
3.91%
2.38%

2.13%
10.00%
0.00%
0.00%
0.00%

0.92%
0.00%

0.00%
0.00%
0.00%
0.00%
100.00%
4.00%

3.57%
7.14%
0.00%

0.00%


0.00%
2.86%
0.00%
0.82%
0.00%
0.00%
0.00%

2.94%
0.00%

0.00%
0.00%
0.00%

1.17%

1 .08%
% PWS
>MCL
0.00%
0.76%

0.00%
0.66%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.10%

0.00%
0.00%
0.00%

0.34%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.03%

0.03%
%GW
PWS
>MCL
0.00%
1 .08%

0.00%
0.72%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.39%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.03%

0.03%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
2.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.07%

0.07%
99%
VALUE
(M9/L)
< 0.00
3.60

< 2.00
0.70
< 0.50
< 0.50
< 0.40

< 0.50
< 0.30

< 1.00
< 2.00
< 1.00
< 0.50
4.80
< 0.50

< 0.50
< 2.00
2.20

< 0.50


< 1.93
< 1.00
< 0.20
< 1.00
< 1.00
< 0.50
< 0.50

< 5.00
< 1.00

< 0.50
< 4.00
< 1.00

< 1.00

< 1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Bromochloromethane is 10 |jg/L.
The highlighted States are part of the  URCIS 24 State Cross-Section.

-------
                          Occurrence of Unregulated Contaminants in Public Water Systems
Table A.S.b  URCIS (Round 1) Data- Bromochloromethane Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
646
131

447
151
6
1
10

1,161
127

213
357
524
13
2
983

1,549
85
1

297


809
590
8
349
2,654
335
303

410
3

992
57
145

13,359

12,881
TOTAL #
SAMPLES
1,528
351

1,127
1,069
9
47
53

2,459
1,220

728
1,889
2,311
22
2
1,750

2,646
323
1

644


1,637
1,595
148
2,122
15,954
444
1,221

1,232
10

3,987
170
313

47,012

44,275
#GW
SAMPLES
1,266
244

954
1,016
6
0
44

1,862
1,080

485
1,486
1,172
18
1
1,376

2,578
297
1

569


1,450
1,475
136
1,581
15,036
363
434

1,127
0

3,656
64
259

40,036

37,952
#SW
SAMPLES
262
107

173
53
3
47
9

597
140

243
403
1,139
4
1
374

68
26
0

75


187
120
12
541
918
81
787

105
10

331
106
54

6,976

6,323
% TOTAL
SAMPLES
>MRL
0.72%
1 .99%

0.62%
1 .03%
0.00%
0.00%
0.00%

0.04%
0.00%

0.14%
0.00%
0.26%
0.00%
100.00%
0.23%

0.26%
0.31 %
100.00%

0.16%


0.24%
0.06%
0.68%
0.09%
0.04%
0.00%
0.08%

0.81%
0.00%

0.00%
0.00%
0.32%

0.19%

0.18%
%GW
SAMPLES
>MRL
0.47%
2.46%

0.31 %
0.89%
0.00%
0.00%
0.00%

0.00%
0.00%

0.21%
0.00%
0.51%
0.00%
100.00%
0.15%

0.23%
0.00%
100.00%

0.18%


0.28%
0.00%
0.74%
0.06%
0.05%
0.00%
0.23%

0.80%
0.00%

0.00%
0.00%
0.39%

0.16%

0.16%
%SW
SAMPLES
>MRL
1 .91 %
0.93%

2.31%
3.77%
0.00%
0.00%
0.00%

0.17%
0.00%

0.00%
0.00%
0.00%
0.00%
100.00%
0.53%

1 .47%
3.85%
0.00%

0.00%


0.00%
0.83%
0.00%
0.18%
0.00%
0.00%
0.00%

0.95%
0.00%

0.00%
0.00%
0.00%

0.30%

0.28%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.04
< 0.05
< 0.10

< 0.50
< 0.00

0.10
< 0.10
< 0.50
< 0.50
0.69
< 0.20

< 0.10
< 0.20
2.20

< 0.50


< 0.00
< 0.00
< 0.20
< 0.04
< 0.00
< 0.50
< 0.01

< 0.10
< 1.00

< 0.50
< 0.50
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
3.60

< 2.00
0.70
< 0.50
< 0.50
< 0.40

< 0.50
< 0.30

< 1.00
< 2.00
< 1.00
< 0.50
4.80
< 0.50

< 0.50
< 2.00
2.20

< 0.50


< 1.93
< 1.00
< 0.20
< 1.00
< 1.00
< 0.50
< 0.50

< 5.00
< 1.00

< 0.50
< 4.00
< 1.00

< 1.00

< 1.00
MAX
VALUE
(M9/L)
7.80
10.50

10.00
210.00
< 0.50
< 0.50
< 0.40

2.80
< 0.30

0.11
< 5.00
3.00
< 0.50
4.80
12.00

3.70
0.50
2.20

27.00


1.20
2.80
0.80
4.60
6.00
< 0.50
0.50

1.00
< 1.00

< 0.50
< 5.00
1.40

210.00

210.00
MIN
DETECTS
(M9/L)
0.30
0.50

0.05
0.70




2.80


0.11

1.00

0.69
0.20

0.50
0.50
2.20

27.00


0.52
2.80
0.80
3.00
0.50

0.50

0.50




1.40

0.05

0.05
MEDIAN
DETECTS
(M9/L)
3.00
3.60

10.00
1.00




2.80


0.11

1.50

2.75
0.95

0.80
0.50
2.20

27.00


0.76
2.80
0.80
3.80
1.00

0.50

0.50




1.40

1.00

1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                               Occurrence of Unregulated Contaminants in Public Water Systems
Table A.S.c  URCIS (Round 1) Data- Bromochloromethane Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,528
351

1,127
1,069
9
47
53

2,459
1,220

728
1,889
2,311
22
2
1,750

2,646
323
1

644


1,637
1,595
148
2,122
15,954
444
1,221

1,232
10

3,987
170
313

47,012

44,275
TOTAL
UNIQUE
PWS
646
131

447
151
6
1
10

1,161
127

213
357
524
13
2
983

1,549
85
1

297


809
590
8
349
2,654
335
303

410
3

992
57
145

13,359

12,881
#GW
PWS
523
93

406
138
4
0
8

1,052
112

149
321
291
9
1
936

1,525
71
1

254


798
555
7
246
2,492
306
156

390
0

937
26
116

11,923

11,576
# SW PWS
128
42

47
20
3
1
2

109
16

64
37
233
4
1
50

28
14
0

44


11
35
2
122
166
29
147

34
3

77
31
38

1,538

1,386
% PWS
>MRL
1 .39%
4.58%

0.89%
5.30%
0.00%
0.00%
0.00%

0.09%
0.00%

0.47%
0.00%
0.76%
0.00%
100.00%
0.41%

0.45%
1.18%
100.00%

0.34%


0.49%
0.17%
12.50%
0.57%
0.26%
0.00%
0.33%

1 .46%
0.00%

0.00%
0.00%
0.69%

0.54%

0.50%
%GW
PWS
>MRL
0.76%
5.38%

0.74%
5.07%
0.00%
0.00%
0.00%

0.00%
0.00%

0.67%
0.00%
1 .37%
0.00%
100.00%
0.21%

0.39%
0.00%
100.00%

0.39%


0.50%
0.00%
14.29%
0.41%
0.28%
0.00%
0.64%

1 .28%
0.00%

0.00%
0.00%
0.86%

0.46%

0.44%
%sw
PWS
>MRL
3.91%
2.38%

2.13%
10.00%
0.00%
0.00%
0.00%

0.92%
0.00%

0.00%
0.00%
0.00%
0.00%
100.00%
4.00%

3.57%
7.14%
0.00%

0.00%


0.00%
2.86%
0.00%
0.82%
0.00%
0.00%
0.00%

2.94%
0.00%

0.00%
0.00%
0.00%

1.17%

1 .08%
% PWS
> 1/2 MCL
0.31%
0.76%

0.22%
0.66%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.10%

0.00%
0.00%
0.00%

0.34%


0.00%
0.00%
0.00%
0.00%
0.04%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.06%

0.06%
%GW
PWS
> 1/2 MCL
0.38%
1 .08%

0.00%
0.72%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.39%


0.00%
0.00%
0.00%
0.00%
0.04%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.05%

0.05%
%sw
PWS
> 1/2 MCL
0.00%
0.00%

2.13%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
2.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.13%

0.14%
% PWS
>MCL
0.00%
0.76%

0.00%
0.66%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.10%

0.00%
0.00%
0.00%

0.34%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.03%

0.03%
%GW
PWS
>MCL
0.00%
1 .08%

0.00%
0.72%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.39%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.03%

0.03%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
2.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.07%

0.07%
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy
The Maximum Contaminant Level (MCL) for Bromochloromethane is 10 [ig/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                        Occurrence of Unregulated Contaminants in Public Water Systems
Table A.6.a  URCIS (Round 1) Data- Bromodichloromethane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
686
143

943
3,572
9
1
13
640
1,162
127
1,002
1,302
389
524
13
96
986
2
1,562
85
81
565
297
35
83
1,517
590
10
237
1,687
335
303

423
3
97
992
132
145

20,789

20,024
# GWPWS
548
99

873
3,518
7
0
11
99
1,053
112
963
1,187
341
291
9
37
940
0
1,537
71
80
523
254
31
32
1,492
555
8
167
1,557
306
156

402
0
56
937
58
116

18,426

17,917
# SW PWS
144
50

108
94
3
1
2
592
109
16
39
115
49
233
4
70
51
2
28
14
4
57
44
4
55
25
35
3
80
134
29
147

35
3
41
77
75
38

2,610

2,324
% PWS
>MRL
16.03%
38.46%

7.53%
6.10%
55.56%
100.00%
53.85%
71 .56%
32.10%
19.69%
34.93%
40.63%
30.33%
71 .56%
30.77%
95.83%
13.79%
100.00%
14.34%
28.24%
100.00%
16.64%
9.09%
100.00%
100.00%
7.51%
4.75%
40.00%
38.40%
25.25%
30.15%
58.75%

11.35%
66.67%
72.16%
22.78%
59.85%
41 .38%

23.69%

22.09%
% GW PWS
>MRL
6.75%
17.17%

3.55%
4.66%
57.14%
0.00%
45.45%
53.54%
25.36%
10.71%
32.50%
34.88%
20.53%
53.95%
0.00%
91.89%
10.11%
0.00%
13.21%
16.90%
100.00%
9.94%
5.51%
100.00%
100.00%
6.10%
1.80%
25.00%
17.37%
19.33%
23.53%
21.15%

7.71%
0.00%
58.93%
18.25%
27.59%
29.31%

15.85%

14.84%
% SW PWS
>MRL
50.69%
80.00%

37.96%
78.72%
66.67%
100.00%
100.00%
73.31%
97.25%
87.50%
94.87%
100.00%
97.96%
93.56%
100.00%
98.57%
84.31%
100.00%
82.14%
85.71%
100.00%
77.19%
29.55%
100.00%
100.00%
92.00%
51 .43%
100.00%
78.75%
94.78%
100.00%
98.64%

60.00%
66.67%
90.24%
93.51%
84.00%
81 .58%

80.92%

79.69%
% PWS
>HRL
0.44%
0.00%

0.21%
0.08%
0.00%
0.00%
0.00%
1.72%
0.00%
0.00%
0.10%
0.15%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.34%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.30%
0.00%

0.24%
0.00%
1.03%
0.10%
0.76%
0.00%

0.13%

0.13%
% GW PWS
>HRL
0.00%
0.00%

0.00%
0.06%
0.00%
0.00%
0.00%
2.02%
0.00%
0.00%
0.10%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.39%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.25%
0.00%
0.00%
0.11%
0.00%
0.00%

0.04%

0.04%
% SW PWS
>HRL
2.08%
0.00%

1.85%
1.06%
0.00%
0.00%
0.00%
1.69%
0.00%
0.00%
0.00%
1.74%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
3.45%
0.00%

0.00%
0.00%
2.44%
0.00%
1.33%
0.00%

0.80%

0.86%
99%
VALUE
(M9/L)
19.00
14.00

30.00
15.00
12.30
26.30
23.70
69.50
15.80
7.40
25.00
24.00
23.00
37.00
13.28
23.00
10.00
2.00
6.20
15.40
13.10
14.00
33.00
20.20
16.00
13.50
4.00
16.00
16.90
16.30
45.00
27.10

12.80
14.00
7.00
7.30
44.00
21.00

22.00

22.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum
Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Bromodichloromethane is 60 ug/L. This is a draft value for working review only.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.6.b URCIS (Round 1) Data- Bromodichloromethane Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE PWS
686
143

943
3,572
9
1
13
640
1,162
127
1,002
1,302
389
524
13
96
986
2
1,562
85
81
565
297
35
83
1,517
590
10
237
1,687
335
303

423
3
97
992
132
145

20,789

20,024
TOTAL #
SAMPLES
1,704
436

3,113
12,631
33
60
386
900
2,462
1,221
2,286
6,007
2,518
2,312
22
365
1,909
4
2,742
327
151
1,624
644
86
254
3,164
1,595
157
1,421
6,371
444
1,221

1,330
10
410
3,987
656
313

65,276

61,590
#GW
SAMPLES
1,369
268

2,376
12,022
30
0
228
137
1,864
1,081
1,861
5,044
1,568
1,172
18
123
1,441
0
2,664
295
124
1,376
569
69
46
2,799
1,475
139
965
5,756
363
434

1,215
0
100
3,656
196
259

53,102

50,965
#SW
SAMPLES
335
168

737
609
3
60
158
763
598
140
425
963
950
1,140
4
242
468
4
78
32
27
248
75
17
208
365
120
18
456
615
81
787

115
10
310
331
460
54

12,174

10,625
% TOTAL
SAMPLES
>MRL
12.50%
20.18%

8.80%
7.68%
39.39%
98.33%
51.04%
66.44%
35.22%
7.70%
36.13%
33.59%
42.49%
60.03%
18.18%
96.16%
17.92%
100.00%
13.09%
12.84%
100.00%
14.29%
5.90%
100.00%
100.00%
9.99%
4.51%
28.03%
24.84%
14.96%
37.16%
71.74%

8.80%
50.00%
69.27%
20.07%
71.04%
30.99%

23.11%

21.50%
%GW
SAMPLES
>MRL
4.82%
9.70%

3.96%
4.11%
36.67%
0.00%
26.32%
42.34%
21.78%
2.50%
25.15%
23.12%
15.31%
33.11%
0.00%
91.87%
10.13%
0.00%
11.00%
5.08%
100.00%
5.89%
2.64%
100.00%
100.00%
4.79%
1.42%
26.62%
5.80%
9.31%
23.69%
39.86%

3.87%
0.00%
60.00%
14.93%
38.78%
20.08%

11.73%

11.06%
%sw
SAMPLES
>MRL
43.88%
36.90%

24.42%
78.16%
66.67%
98.33%
86.71%
70.77%
77.09%
47.86%
84.24%
88.47%
87.37%
87.72%
100.00%
98.35%
41.88%
100.00%
84.62%
84.38%
100.00%
60.89%
30.67%
100.00%
100.00%
49.86%
42.50%
38.89%
65.13%
67.80%
97.53%
89.33%

60.87%
50.00%
72.26%
76.74%
84.78%
83.33%

72.75%

71.53%
MIN VALUE
(H9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.05
< 0.50
< 0.10
< 0.00
< 0.10
< 0.00
< 0.00
< 0.04
< 0.03
< 0.50
< 0.02
< 0.00
< 0.10
1.00
< 0.20
< 0.50
0.40
< 0.00
< 0.50
0.20
0.39
< 0.00
< 0.00
< 0.00
< 0.10
< 0.00
< 0.15
< 0.01

< 0.10
< 1.00
< 0.00
< 0.50
< 0.50
< 0.01

< 0.00

< 0.00
99% VALUE
(H9/L)
19.00
14.00

30.00
15.00
12.30
26.30
23.70
69.50
15.80
7.40
25.00
24.00
23.00
37.00
13.28
23.00
10.00
2.00
6.20
15.40
13.10
14.00
33.00
20.20
16.00
13.50
4.00
16.00
16.90
16.30
45.00
27.10

12.80
14.00
7.00
7.30
44.00
21.00

22.00

22.00
MAX VALUE
(H9/L)
142.00
26.00

84.00
100.00
12.30
26.30
29.00
284.00
34.50
14.00
170.00
170.00
39.00
55.00
13.28
28.00
57.00
2.00
37.00
36.00
23.00
22.30
82.20
20.20
49.00
29.00
39.50
17.00
60.00
44.30
68.30
50.40

93.00
14.00
83.00
97.50
65.00
31.00

284.00

284.00
MIN
DETECTS
(M9/L)
0.30
0.52

0.50
0.02
0.06
1.94
0.10
0.01
0.10
1.00
0.20
0.38
0.06
0.50
1.00
0.14
0.10
1.00
0.20
0.70
0.40
0.50
4.80
0.20
0.39
0.10
0.30
0.20
0.20
0.42
0.15
0.01

0.10
1.30
0.50
0.50
0.75
0.20

0.01

0.01
MEDIAN
DETECTS
(M9/L)
3.50
5.09

11.00
2.75
2.40
12.10
7.60
5.00
3.50
3.30
5.00
4.00
7.00
6.50
5.65
3.00
1.95
1.00
1.20
9.00
2.20
3.20
14.95
2.25
2.76
3.00
1.75
0.75
3.60
3.80
2.74
3.60

3.70
3.60
2.60
1.55
7.00
5.00

4.00

4.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                                      Occurrence of Unregulated Contaminants in Public Water Systems
Table A.6.C  URCIS (Round 1) Data- Bromodichloromethane Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL #
SAMPLES
1,704
436

3,113
12,631
33
60
386
900
2,462
1,221
2,286
6,007
2,518
2,312
22
365
1,909
4
2,742
327
151
1,624
644
86
254
3,164
1,595
157
1,421
6,371
444
1,221

1,330
10
410
3,987
656
313

65,276

61,590
TOTAL
UNIQUE PWS
686
143

943
3,572
9
1
13
640
1,162
127
1,002
1,302
389
524
13
96
986
2
1,562
85
81
565
297
35
83
1,517
590
10
237
1,687
335
303

423
3
97
992
132
145

20,789

20,024
# GWPWS
548
99

873
3,518
7
0
11
99
1,053
112
963
1,187
341
291
9
37
940
0
1,537
71
80
523
254
31
32
1,492
555
8
167
1,557
306
156

402
0
56
937
58
116

18,426

17,917
3SWPWS
144
50

108
94
3
1
2
592
109
16
39
115
49
233
4
70
51
2
28
14
4
57
44
4
55
25
35
3
80
134
29
147

35
3
41
77
75
38

2,610

2,324
%PWS
>MRL
16.03%
38.46%

7.53%
6.10%
55.56%
100.00%
53.85%
71.56%
32.10%
19.69%
34.93%
40.63%
30.33%
71.56%
30.77%
95.83%
13.79%
100.00%
14.34%
28.24%
100.00%
16.64%
9.09%
100.00%
100.00%
7.51%
4.75%
40.00%
38.40%
25.25%
30.15%
58.75%

11.35%
66.67%
72.16%
22.78%
59.85%
41.38%

23.69%

22.09%
% GW PWS
>MRL
6.75%
17.17%

3.55%
4.66%
57.14%
0.00%
45.45%
53.54%
25.36%
10.71%
32.50%
34.88%
20.53%
53.95%
0.00%
91.89%
10.11%
0.00%
13.21%
16.90%
100.00%
9.94%
5.51%
100.00%
100.00%
6.10%
1.80%
25.00%
17.37%
19.33%
23.53%
21.15%

7.71%
0.00%
58.93%
18.25%
27.59%
29.31%

15.85%

14.84%
% SW PWS
>MRL
50.69%
80.00%

37.96%
78.72%
66.67%
100.00%
100.00%
73.31%
97.25%
87.50%
94.87%
100.00%
97.96%
93.56%
100.00%
98.57%
84.31%
100.00%
82.14%
85.71%
100.00%
77.19%
29.55%
100.00%
100.00%
92.00%
51.43%
100.00%
78.75%
94.78%
100.00%
98.64%

60.00%
66.67%
90.24%
93.51%
84.00%
81.58%

80.92%

79.69%
% PWS
> 1/2 HRL
0.73%
0.00%

1.27%
0.45%
0.00%
0.00%
0.00%
7.03%
0.09%
0.00%
0.90%
1.77%
0.26%
6.68%
0.00%
0.00%
0.20%
0.00%
0.06%
1.18%
0.00%
0.00%
2.69%
0.00%
1.20%
0.00%
0.17%
0.00%
0.84%
0.41%
0.90%
2.64%

0.24%
0.00%
1.03%
0.20%
1.52%
0.69%

0.90%

0.91%
% GW PWS
> 1/2 HRL
0.18%
0.00%

0.23%
0.20%
0.00%
0.00%
0.00%
2.02%
0.00%
0.00%
0.21%
0.34%
0.00%
0.69%
0.00%
0.00%
0.21%
0.00%
0.07%
0.00%
0.00%
0.00%
3.15%
0.00%
0.00%
0.00%
0.00%
0.00%
0.60%
0.06%
0.00%
0.00%

0.25%
0.00%
0.00%
0.21%
0.00%
0.00%

0.20%

0.20%
% SW PWS
> 1/2 HRL
2.78%
0.00%

9.26%
9.57%
0.00%
0.00%
0.00%
7.60%
0.92%
0.00%
17.95%
16.52%
2.04%
14.16%
0.00%
0.00%
0.00%
0.00%
0.00%
7.14%
0.00%
0.00%
0.00%
0.00%
1.82%
0.00%
2.86%
0.00%
1.25%
4.48%
10.34%
5.44%

0.00%
0.00%
2.44%
0.00%
2.67%
2.63%

5.90%

6.45%
%PWS
>HRL
0.44%
0.00%

0.21%
0.08%
0.00%
0.00%
0.00%
1.72%
0.00%
0.00%
0.10%
0.15%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.34%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.30%
0.00%

0.24%
0.00%
1.03%
0.10%
0.76%
0.00%

0.13%

0.13%
% GW PWS
>HRL
0.00%
0.00%

0.00%
0.06%
0.00%
0.00%
0.00%
2.02%
0.00%
0.00%
0.10%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.39%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.25%
0.00%
0.00%
0.11%
0.00%
0.00%

0.04%

0.04%
% SW PWS
>HRL
2.08%
0.00%

1.85%
1.06%
0.00%
0.00%
0.00%
1.69%
0.00%
0.00%
0.00%
1.74%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
3.45%
0.00%

0.00%
0.00%
2.44%
0.00%
1.33%
0.00%

0.80%

0.86%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Bromodichloromethane is 60 Mg/L.  This is a draft value for working review only.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                Occurrence of Unregulated Contaminants in Public Water Systems
Table A.7.a  URCIS (Round 1) Data- Bromoform Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE PWS
689
131

944
3,563
9
1
13
365
1,162
127
1,002
1,303
380
524
13
13
986
1
1,565
85
32
565
297
37
8
1,518
590
10
234
1,687
335
303

422
3
12
992
132
145

20,198

19,727
GWPWS
550
93

874
3,523
7
0
11
67
1,053
112
963
1,188
338
291
9
7
940
1
1,540
71
32
523
254
33
5
1,493
555
8
165
1,557
306
156

402
0
7
937
58
116

18,245

17,889
SWPWS
145
43

108
68
3
1
2
323
109
16
39
115
43
233
4
6
51
0
29
14
1
57
44
4
3
25
35
3
79
134
29
147

34
3
5
77
75
38

2,145

2,017
% PWS >
MRL
4.79%
3.05%

6.67%
5.22%
44.44%
100.00%
38.46%
35.89%
11.88%
19.69%
15.37%
18.19%
11.58%
30.15%
0.00%
61.54%
3.45%
100.00%
1.85%
2.35%
100.00%
7.26%
4.38%
100.00%
100.00%
3.62%
3.22%
10.00%
10.26%
11.32%
17.91%
8.25%

4.74%
100.00%
91.67%
9.38%
9.09%
16.55%

9.54%

8.95%
% GW PWS >
MRL
1.45%
3.23%

3.78%
4.71%
57.14%
0.00%
0.00%
26.87%
12.25%
20.54%
14.85%
17.17%
9.76%
30.58%
0.00%
71.43%
3.09%
100.00%
1.82%
0.00%
100.00%
5.35%
3.94%
100.00%
100.00%
3.15%
3.06%
12.50%
9.09%
10.53%
15.03%
8.33%

4.48%
0.00%
85.71%
9.61%
8.62%
19.83%

8.07%

7.51%
% SW PWS>
MRL
17.24%
2.33%

28.70%
44.12%
0.00%
100.00%
100.00%
35.91%
8.26%
12.50%
28.21%
28.70%
25.58%
29.61%
0.00%
50.00%
9.80%
0.00%
3.45%
14.29%
100.00%
22.81%
6.82%
100.00%
100.00%
32.00%
5.71%
0.00%
11.39%
20.15%
48.28%
8.16%

8.82%
100.00%
100.00%
6.49%
9.33%
5.26%

22.05%

21.72%
% PWS >
HRL
0.00%
0.00%

0.11%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.01%
% GW PWS >
HRL
0.00%
0.00%

0.11%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01%

0.01%
% SW PWS >
HRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
99% VALUE
(M9/L)
15.00
2.00

14.00
9.50
11.00
0.10
4.20
33.00
2.70
7.90
5.00
6.10
3.90
25.00
< 0.50
8.70
0.90
3.00
1.10
< 2.00
55.00
1.90
11.50
21.30
4.00
1.57
1.00
1.10
6.75
6.18
4.87
3.50

1.90
31.00
1.40
4.50
52.00
12.00

7.50

7.32
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for
laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Bromoform is 400 ug/L. This is a draft value for working review only.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.7.b URCIS (Round 1) Data- Bromoform Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE PWS
689
131

944
3,563
9
1
13
365
1,162
127
1,002
1,303
380
524
13
13
986
1
1,565
85
32
565
297
37
8
1,518
590
10
234
1,687
335
303

422
3
12
992
132
145

20,198

19,727
TOTAL #
SAMPLES
1,710
356

3,155
12,792
33
60
386
494
2,464
1,221
2,286
6,011
2,464
2,312
22
33
1,909
1
2,748
326
61
1,624
644
63
20
3,167
1,595
157
1,402
6,372
444
1,221

1,331
10
43
3,987
656
313

63,893

61,276
#GW
SAMPLES
1,372
247

2,404
12,295
30
0
228
100
1,865
1,081
1,861
5,044
1,552
1,172
18
26
1,441
1
2,670
294
60
1,376
569
55
17
2,801
1,475
139
962
5,757
363
434

1,217
0
7
3,656
196
259

53,044

51,207
#SW
SAMPLES
338
109

751
497
3
60
158
394
599
140
425
967
912
1,140
4
7
468
0
78
32
1
248
75
8
3
366
120
18
440
615
81
787

114
10
36
331
460
54

10,849

10,069
% TOTAL
SAMPLES >
MRL
3.22%
1.69%

7.42%
5.48%
12.12%
1.67%
19.17%
29.15%
7.06%
4.34%
9.36%
10.38%
8.77%
15.87%
0.00%
57.58%
2.51%
100.00%
1.20%
0.61%
100.00%
4.25%
2.17%
100.00%
100.00%
2.78%
5.02%
3.82%
4.28%
4.74%
18.47%
10.24%

2.10%
90.00%
60.47%
6.04%
7.01%
12.46%

6.78%

6.50%
%GW
SAMPLES >
MRL
0.73%
1.62%

5.03%
4.12%
13.33%
0.00%
20.61%
22.00%
8.69%
4.26%
10.69%
10.79%
7.47%
17.49%
0.00%
61.54%
2.91%
100.00%
1.20%
0.00%
100.00%
3.71%
1.93%
100.00%
100.00%
2.57%
5.22%
4.32%
3.85%
4.39%
13.50%
22.35%

2.05%
0.00%
85.71%
6.40%
14.29%
14.29%

6.02%

5.75%
%SW
SAMPLES >
MRL
13.31%
1.83%

15.05%
39.24%
0.00%
1.67%
17.09%
30.96%
2.00%
5.00%
3.53%
8.27%
10.96%
14.21%
0.00%
42.86%
1.28%
0.00%
1.28%
6.25%
100.00%
7.26%
4.00%
100.00%
100.00%
4.37%
2.50%
0.00%
5.23%
7.97%
40.74%
3.56%

2.63%
90.00%
55.56%
2.11%
3.91%
3.70%

10.48%

10.33%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.04
< 0.00
< 0.00
< 0.00
< 0.30
< 0.00
< 0.30
< 0.00
< 0.04
< 0.50
< 0.50
< 0.52
< 0.10
3.00
< 0.10
< 0.20
0.30
< 0.40
< 0.50
0.20
0.48
< 0.00
< 0.00
< 0.20
< 0.10
< 0.00
< 0.15
< 0.02

< 0.00
< 1.00
< 0.00
< 0.50
< 0.20
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
15.00
2.00

14.00
9.50
11.00
0.10
4.20
33.00
2.70
7.90
5.00
6.10
3.90
25.00
< 0.50
8.70
0.90
3.00
1.10
< 2.00
55.00
1.90
11.50
21.30
4.00
1.57
1.00
1.10
6.75
6.18
4.87
3.50

1.90
31.00
1.40
4.50
52.00
12.00

7.50

7.32
MAX VALUE
(M9/L)
291.00
6.40

1,100.00
90.50
11.00
0.10
5.80
61.00
11.20
25.80
300.20
72.00
26.00
246.00
< 0.50
8.70
9.90
3.00
21.00
2.00
55.00
6.70
141.80
21.30
40.00
44.00
31.00
2.20
55.00
77.60
11.10
14.10

14.60
31.00
1.40
28.00
102.00
15.00

1,100.00

1,100.00
MIN DETECTS
(M9/L)
0.30
1.10

0.10
0.02
0.63
0.10
0.10
0.01
0.30
0.70
0.50
0.12
0.09
0.80

0.52
0.10
3.00
0.40
1.00
0.30
0.40
0.50
0.20
0.48
0.08
0.50
0.20
0.50
0.32
0.15
0.08

1.00
4.10
0.50
0.50
1.10
0.20

0.01

0.01
MEDIAN
DETECTS
(M9/L)
4.40
3.10

3.00
2.40
2.95
0.10
0.45
2.00
1.10
5.20
1.35
1.55
1.00
3.00

1.10
0.70
3.00
1.80
1.50
1.40
1.00
7.45
1.40
1.75
1.30
7.00
0.90
2.00
2.34
0.58
0.50

1.90
14.00
0.50
1.40
10.25
1.20

1.90

2.00
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.7.C  URCIS (Round 1) Data- Bromoform Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL #
SAMPLES
1,710
356

3,155
12,792
33
60
386
494
2,464
1,221
2,286
6,011
2,464
2,312
22
33
1,909
1
2,748
326
61
1,624
644
63
20
3,167
1,595
157
1,402
6,372
444
1,221

1,331
10
43
3,987
656
313

63,893

61,276
TOTAL
UNIQUE PWS
689
131

944
3,563
9
1
13
365
1,162
127
1,002
1,303
380
524
13
13
986
1
1,565
85
32
565
297
37
8
1,518
590
10
234
1,687
335
303

422
3
12
992
132
145

20,198

19,727
GWPWS
550
93

874
3,523
7
0
11
67
1,053
112
963
1,188
338
291
9
7
940
1
1,540
71
32
523
254
33
5
1,493
555
8
165
1,557
306
156

402
0
7
937
58
116

18,245

17,889
SWPWS
145
43

108
68
3
1
2
323
109
16
39
115
43
233
4
6
51
0
29
14
1
57
44
4
3
25
35
3
79
134
29
147

34
3
5
77
75
38

2,145

2,017
% PWS >
MRL
4.79%
3.05%

6.67%
5.22%
44.44%
100.00%
38.46%
35.89%
11.88%
19.69%
15.37%
18.19%
11.58%
30.15%
0.00%
61.54%
3.45%
100.00%
1.85%
2.35%
100.00%
7.26%
4.38%
100.00%
100.00%
3.62%
3.22%
10.00%
10.26%
11.32%
17.91%
8.25%

4.74%
100.00%
91.67%
9.38%
9.09%
16.55%

9.54%

8.95%
% GW PWS >
MRL
1 .45%
3.23%

3.78%
4.71%
57.14%
0.00%
0.00%
26.87%
12.25%
20.54%
14.85%
17.17%
9.76%
30.58%
0.00%
71.43%
3.09%
100.00%
1 .82%
0.00%
100.00%
5.35%
3.94%
100.00%
100.00%
3.15%
3.06%
12.50%
9.09%
10.53%
15.03%
8.33%

4.48%
0.00%
85.71%
9.61%
8.62%
19.83%

8.07%

7.51%
% SW PWS>
MRL
17.24%
2.33%

28.70%
44.12%
0.00%
100.00%
100.00%
35.91%
8.26%
12.50%
28.21%
28.70%
25.58%
29.61%
0.00%
50.00%
9.80%
0.00%
3.45%
14.29%
100.00%
22.81%
6.82%
100.00%
100.00%
32.00%
5.71%
0.00%
11.39%
20.15%
48.28%
8.16%

8.82%
100.00%
100.00%
6.49%
9.33%
5.26%

22.05%

21.72%
% PWS > 1/2
HRL
0.15%
0.00%

0.11%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.10%
0.00%
0.00%
0.19%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.02%

0.02%
% GW PWS >
1/2 HRL
0.00%
0.00%

0.11%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.10%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01%

0.01%
% SW PWS >
1/2 HRL
0.69%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.43%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.09%

0.10%
% PWS >
HRL
0.00%
0.00%

0.11%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.01%
% GW PWS >
HRL
0.00%
0.00%

0.11%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01%

0.01%
% SW PWS >
HRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Bromodichloromethane is 60 pg/L. This is a draft value for working review only.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.8.a  URCIS (Round 1) Data- Bromomethane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
661
131

944
3,516
9
1
13
228
1,162
127
805
1,301
304
524
13

985

1,553
71
1
565
297
3

1,518
590
8
355
2,654
335
303
1
423
3
1
992
135
145

20,677

20,198
# GW
PWS
532
93

874
3,482
7
0
11
45
1,053
112
766
1,186
273
291
9

939

1,529
57
1
523
254
3

1,493
555
7
252
2,492
306
156
1
403
0
1
937
62
116

18,821

18,472
# SW PWS
134
42

106
51
4
1
2
204
109
16
39
115
32
233
4

51

28
14
0
57
44
0

25
35
2
122
166
29
147
0
34
3
0
77
74
38

2,038

1,886
% PWS
>MRL
0.45%
0.00%

0.21 %
0.40%
11.11%
100.00%
7.69%
3.51 %
0.00%
0.00%
0.12%
0.38%
0.33%
7.63%
0.00%

0.20%

0.00%
0.00%
100.00%
0.00%
1 .35%
100.00%

0.26%
0.00%
0.00%
0.56%
2.07%
0.00%
0.99%
100.00%
1 .89%
0.00%
100.00%
0.30%
0.74%
0.69%

0.80%

0.77%
%GW
PWS
>MRL
0.19%
0.00%

0.11%
0.34%
14.29%
0.00%
0.00%
2.22%
0.00%
0.00%
0.00%
0.42%
0.37%
13.75%
0.00%

0.11%

0.00%
0.00%
100.00%
0.00%
0.39%
100.00%

0.13%
0.00%
0.00%
0.40%
2.17%
0.00%
0.64%
100.00%
1 .74%
0.00%
100.00%
0.32%
1 .61 %
0.86%

0.74%

0.71 %
%sw
PWS
>MRL
1 .49%
0.00%

0.94%
3.92%
25.00%
100.00%
50.00%
3.43%
0.00%
0.00%
2.56%
0.00%
0.00%
0.00%
0.00%

1 .96%

0.00%
0.00%
0.00%
0.00%
6.82%
0.00%

8.00%
0.00%
0.00%
0.82%
0.60%
0.00%
1 .36%
0.00%
2.94%
0.00%
0.00%
0.00%
0.00%
0.00%

1 .32%

1 .22%
% PWS
>MCL
0.15%
0.00%

0.00%
0.03%
0.00%
0.00%
7.69%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.29%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.34%
0.00%

0.00%
0.00%
0.00%
0.00%
0.08%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.74%
0.00%

0.09%

0.09%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
4.12%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.39%
0.00%

0.00%
0.00%
0.00%
0.00%
0.04%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .61 %
0.00%

0.08%

0.08%
%sw
PWS
>MCL
0.75%
0.00%

0.00%
1 .96%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.60%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.20%

0.16%
99% VALUE
(M9/L)
< 0.00
< 0.50

< 5.00
< 2.00
5.00
0.50
< 0.90
1.00
< 0.50
< 0.30
< 1.00
< 2.00
< 2.00
7.00
< 0.50

< 0.50

< 2.00
< 2.00
6.30
< 1.00
< 0.50
1.40

< 4.51
< 1.00
< 0.20
< 1.00
< 4.00
< 0.50
< 1.10
5.00
< 0.50
< 1.00
1.00
< 0.50
< 4.00
< 2.00

< 4.00

< 4.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Bromomethane (Methyl Bromide) is 10 |jg/L.
The highlighted States are part of the  URCIS 24 State Cross-Section.

-------
                          Occurrence of Unregulated Contaminants in Public Water Systems
Table A.S.b  URCIS (Round 1) Data- Bromomethane Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
661
131

944
3,516
9
1
13
228
1,162
127
805
1,301
304
524
13

985

1,553
71
1
565
297
3

1,518
590
8
355
2,654
335
303
1
423
3
1
992
135
145

20,677

20,198
TOTAL #
SAMPLES
1,609
351

2,935
13,073
34
63
333
322
2,463
1,222
1,212
5,999
1,709
2,311
22

1,908

2,657
228
3
1,621
644
3

3,166
1,595
148
2,168
15,951
444
1,221
1
1,326
10
1
3,987
385
313

71 ,438

68,424
#GW
SAMPLES
1,323
244

2,274
12,823
30
0
189
69
1,864
1,081
1,035
5,034
1,325
1,172
18

1,440

2,589
202
3
1,376
569
3

2,800
1,475
136
1,619
15,034
363
434
1
1,212
0
1
3,656
161
259

61,814

59,612
#SW
SAMPLES
286
107

661
250
4
63
144
253
599
141
177
965
384
1,139
4

468

68
26
0
245
75
0

366
120
12
549
917
81
787
0
114
10
0
331
224
54

9,624

8,812
% TOTAL
SAMPLES
>MRL
0.19%
0.00%

0.07%
0.27%
5.88%
1 .59%
0.30%
2.48%
0.00%
0.00%
0.08%
0.12%
0.12%
3.63%
0.00%

0.10%

0.00%
0.00%
100.00%
0.00%
0.78%
100.00%

0.13%
0.00%
0.00%
0.09%
0.48%
0.00%
0.33%
100.00%
1.21%
0.00%
100.00%
0.10%
0.26%
0.32%

0.38%

0.37%
%GW
SAMPLES
>MRL
0.08%
0.00%

0.04%
0.26%
3.33%
0.00%
0.00%
1 .45%
0.00%
0.00%
0.00%
0.14%
0.15%
7.17%
0.00%

0.07%

0.00%
0.00%
100.00%
0.00%
0.18%
100.00%

0.07%
0.00%
0.00%
0.06%
0.50%
0.00%
0.46%
100.00%
1 .24%
0.00%
100.00%
0.11%
0.62%
0.39%

0.39%

0.39%
%SW
SAMPLES
>MRL
0.70%
0.00%

0.15%
0.80%
25.00%
1 .59%
0.69%
2.77%
0.00%
0.00%
0.56%
0.00%
0.00%
0.00%
0.00%

0.21%

0.00%
0.00%
0.00%
0.00%
5.33%
0.00%

0.55%
0.00%
0.00%
0.18%
0.11%
0.00%
0.25%
0.00%
0.88%
0.00%
0.00%
0.00%
0.00%
0.00%

0.29%

0.27%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.03
< 0.00
< 0.00
< 0.00
< 0.50
< 0.00
< 0.10
< 0.00
< 0.09
< 0.50
< 0.50

< 0.10

< 2.00
< 0.20
0.60
< 0.50
< 0.50
0.40

< 0.00
< 0.00
< 0.20
< 0.11
< 0.07
< 0.50
< 0.10
5.00
< 0.10
< 1.00
1.00
< 0.50
< 0.50
< 0.10

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
< 0.50

< 5.00
< 2.00
5.00
0.50
< 0.90
1.00
< 0.50
< 0.30
< 1.00
< 2.00
< 2.00
7.00
< 0.50

< 0.50

< 2.00
< 2.00
6.30
< 1.00
< 0.50
1.40

< 4.51
< 1.00
< 0.20
< 1.00
< 4.00
< 0.50
< 1.10
5.00
< 0.50
< 1.00
1.00
< 0.50
< 4.00
< 2.00

< 4.00

< 4.00
MAX
VALUE
(M9/L)
11.00
< 0.50

2.00
11.00
5.00
0.50
49.90
2.00
< 0.50
< 0.30
0.50
3.50
0.49
43.00
< 0.50

0.40

< 20.00
< 2.00
6.30
< 1.00
25.70
1.40

5.00
< 5.00
< 0.20
3.00
15.20
< 0.50
10.00
5.00
7.40
< 1.00
1.00
2.40
29.00
0.80

49.90

43.00
MIN
DETECTS
(M9/L)
2.80


0.80
0.50
4.69
0.50
49.90
0.10


0.50
0.16
0.49
1.00


0.10



0.60

1.10
0.40

0.50


2.15
0.07

0.60
5.00
0.50

1.00
0.90
29.00
0.80

0.07

0.07
MEDIAN
DETECTS
(M9/L)
5.20


1.40
0.50
4.85
0.50
49.90
1.00


0.50
0.50
0.49
4.00


0.25



4.10

1.10
0.60

2.21


2.58
0.70

1.40
5.00
0.50

1.00
1.30
29.00
0.80

1.00

1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                             Occurrence of Unregulated Contaminants in Public Water Systems
Table A.S.c  URCIS (Round 1) Data- Bromomethane Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,609
351

2,935
13,073
34
63
333
322
2,463
1,222
1,212
5,999
1,709
2,311
22

1,908

2,657
228
3
1,621
644
3

3,166
1,595
148
2,168
15,951
444
1,221
1
1,326
10
1
3,987
385
313

71,438

68,424
TOTAL
UNIQUE
PWS
661
131

944
3,516
9
1
13
228
1,162
127
805
1,301
304
524
13

985

1,553
71
1
565
297
3

1,518
590
8
355
2,654
335
303
1
423
3
1
992
135
145

20,677

20,198
#GW
PWS
532
93

874
3,482
7
0
11
45
1,053
112
766
1,186
273
291
9

939

1,529
57
1
523
254
3

1,493
555
7
252
2,492
306
156
1
403
0
1
937
62
116

18,821

18,472
#SW
PWS
134
42

106
51
4
1
2
204
109
16
39
115
32
233
4

51

28
14
0
57
44
0

25
35
2
122
166
29
147
0
34
3
0
77
74
38

2,038

1,886
% PWS
>MRL
0.45%
0.00%

0.21%
0.40%
11.11%
100.00%
7.69%
3.51%
0.00%
0.00%
0.12%
0.38%
0.33%
7.63%
0.00%

0.20%

0.00%
0.00%
100.00%
0.00%
1.35%
100.00%

0.26%
0.00%
0.00%
0.56%
2.07%
0.00%
0.99%
100.00%
1.89%
0.00%
100.00%
0.30%
0.74%
0.69%

0.80%

0.77%
%GW
PWS
>MRL
0.19%
0.00%

0.11%
0.34%
14.29%
0.00%
0.00%
2.22%
0.00%
0.00%
0.00%
0.42%
0.37%
13.75%
0.00%

0.11%

0.00%
0.00%
100.00%
0.00%
0.39%
100.00%

0.13%
0.00%
0.00%
0.40%
2.17%
0.00%
0.64%
100.00%
1 .74%
0.00%
100.00%
0.32%
1 .61 %
0.86%

0.74%

0.71 %
%sw
PWS
>MRL
1.49%
0.00%

0.94%
3.92%
25.00%
100.00%
50.00%
3.43%
0.00%
0.00%
2.56%
0.00%
0.00%
0.00%
0.00%

1.96%

0.00%
0.00%
0.00%
0.00%
6.82%
0.00%

8.00%
0.00%
0.00%
0.82%
0.60%
0.00%
1.36%
0.00%
2.94%
0.00%
0.00%
0.00%
0.00%
0.00%

1.32%

1.22%
% PWS
> 1/2 MCL
0.30%
0.00%

0.00%
0.03%
0.00%
0.00%
7.69%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
3.05%
0.00%

0.00%

0.00%
0.00%
100.00%
0.00%
0.34%
0.00%

0.00%
0.00%
0.00%
0.00%
0.23%
0.00%
0.33%
0.00%
0.24%
0.00%
0.00%
0.00%
0.74%
0.00%

0.15%

0.14%
%GW
PWS
> 1/2 MCL
0.19%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
5.50%
0.00%

0.00%

0.00%
0.00%
100.00%
0.00%
0.39%
0.00%

0.00%
0.00%
0.00%
0.00%
0.20%
0.00%
0.00%
0.00%
0.25%
0.00%
0.00%
0.00%
1.61%
0.00%

0.14%

0.14%
%sw
PWS
> 1/2 MCL
0.75%
0.00%

0.00%
1 .96%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.60%
0.00%
0.68%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.25%

0.21 %
% PWS
>MCL
0.15%
0.00%

0.00%
0.03%
0.00%
0.00%
7.69%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.29%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.34%
0.00%

0.00%
0.00%
0.00%
0.00%
0.08%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.74%
0.00%

0.09%

0.09%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
4.12%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.39%
0.00%

0.00%
0.00%
0.00%
0.00%
0.04%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .61 %
0.00%

0.08%

0.08%
%sw
PWS
>MCL
0.75%
0.00%

0.00%
1.96%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.60%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.20%

0.16%
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the

The Maximum Contaminant Level (MCL) for Bromomethane (Methyl Bromide) is 10 ug/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.9.a  URCIS (Round 1) Data- Carbon Tetrachloride Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
686
132

971
3,530
17
1
13

1,162
19


394
525
13
7
844
4
1,565
85
2

297
58

1,242
590
10
356
1,686


12
418
3

992
69
144

15,847

15,266
# GW
PWS
555
94

895
3,501
12
0
11

1,053
15


349
291
9
3
798
4
1,540
71
2

254
56

1,239
555
8
253
1,556


4
396
0

937
32
116

14,609

14,176
# SW PWS
137
42

119
40
6
1
2

109
4


46
234
4
4
51
0
29
14
1

44
2

3
35
4
122
134


8
36
3

77
37
37

1,385

1,214
% PWS
>MRL
1 .31 %
2.27%

0.00%
1 .33%
41.18%
100.00%
15.38%

0.26%
0.00%


2.03%
3.05%
38.46%
71 .43%
4.74%
100.00%
1 .28%
0.00%
100.00%

6.06%
100.00%

1 .37%
0.17%
10.00%
1.12%
0.36%


100.00%
0.96%
0.00%

0.60%
0.00%
2.08%

1 .91 %

1 .32%
%GW
PWS
>MRL
1 .26%
3.19%

0.00%
1 .34%
33.33%
0.00%
18.18%

0.28%
0.00%


1.15%
2.06%
22.22%
100.00%
2.13%
100.00%
1 .23%
0.00%
100.00%

5.12%
100.00%

1 .37%
0.18%
12.50%
0.79%
0.39%


100.00%
1 .01 %
0.00%

0.64%
0.00%
0.86%

1 .60%

1 .09%
%sw
PWS
>MRL
1 .46%
0.00%

0.00%
0.00%
50.00%
100.00%
0.00%

0.00%
0.00%


8.70%
4.27%
75.00%
50.00%
47.06%
0.00%
3.45%
0.00%
100.00%

1 1 .36%
100.00%

0.00%
0.00%
0.00%
1 .64%
0.00%


100.00%
0.00%
0.00%

0.00%
0.00%
5.41 %

5.05%

3.95%
% PWS
>MCL
0.44%
0.00%

0.00%
0.34%
17.65%
0.00%
0.00%

0.09%
0.00%


0.00%
0.00%
0.00%
0.00%
0.24%
25.00%
0.00%
0.00%
0.00%

0.67%
24.14%

0.08%
0.17%
0.00%
0.28%
0.00%


16.67%
0.00%
0.00%

0.20%
0.00%
0.00%

0.28%

0.16%
%GW
PWS
>MCL
0.54%
0.00%

0.00%
0.34%
16.67%
0.00%
0.00%

0.09%
0.00%


0.00%
0.00%
0.00%
0.00%
0.13%
25.00%
0.00%
0.00%
0.00%

0.00%
25.00%

0.08%
0.18%
0.00%
0.00%
0.00%


50.00%
0.00%
0.00%

0.21 %
0.00%
0.00%

0.27%

0.15%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
16.67%
0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
1 .96%
0.00%
0.00%
0.00%
0.00%

4.55%
0.00%

0.00%
0.00%
0.00%
0.82%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.36%

0.25%
99% VALUE
(M9/L)
< 0.00
0.70

< 1.00
5.50
9.00
0.90
< 0.50

< 0.50
< 0.30


0.19
< 1.00
2.77
3.10
0.90
41.00
< 0.20
< 2.00
1.80

1.80
36.30

0.54
< 1.00
0.40
< 1.00
< 0.50


514.00
2.00
< 0.50

< 0.50
< 4.00
< 0.70

1.90

1.60
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Carbon Tetrachloride is 5 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.9.b  URCIS (Round 1) Data- Carbon Tetrachloride Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
686
132

971
3,530
17
1
13

1,162
19


394
525
13
7
844
4
1,565
85
2

297
58

1,242
590
10
356
1,686


12
418
3

992
69
144

15,847

15,266
TOTAL #
SAMPLES
1,786
354

3,103
12,807
44
66
336

2,458
60


2,622
3,687
22
12
1,785
4
2,754
329
5

644
146

1,771
1,595
191
2,166
6,366


19
1,289
10

3,987
463
310

51,191

47,841
#GW
SAMPLES
1,483
247

2,386
12,699
38
0
191

1,863
33


1,804
1,406
18
8
1,306
4
2,675
297
3

569
143

1,762
1,475
155
1,616
5,756


11
1,174
0

3,656
130
259

43,167

40,683
#SW
SAMPLES
303
107

717
108
6
66
145

595
27


818
2,281
4
4
479
0
79
32
2

75
3

9
120
36
550
610


8
115
10

331
333
51

8,024

7,158
% TOTAL
SAMPLES
>MRL
0.56%
1.13%

0.00%
5.11%
18.18%
4.55%
0.89%

0.85%
0.00%


1 .07%
0.46%
31 .82%
83.33%
6.05%
100.00%
0.80%
0.00%
100.00%

3.73%
100.00%

1 .75%
0.13%
1 .57%
0.37%
0.53%


100.00%
0.62%
0.00%

0.43%
0.00%
0.97%

2.34%

2.06%
%GW
SAMPLES
>MRL
0.54%
1 .62%

0.00%
5.16%
13.16%

1 .57%

1.13%
0.00%


1 .22%
0.43%
22.22%
100.00%
2.60%
100.00%
0.79%
0.00%
100.00%

3.16%
100.00%

1 .76%
0.14%
1 .94%
0.12%
0.59%


100.00%
0.68%


0.46%
0.00%
0.39%

2.47%

2.17%
%SW
SAMPLES
>MRL
0.66%
0.00%

0.00%
0.00%
50.00%
4.55%
0.00%

0.00%
0.00%


0.73%
0.48%
75.00%
50.00%
15.45%

1 .27%
0.00%
100.00%

8.00%
100.00%

0.00%
0.00%
0.00%
1 .09%
0.00%


100.00%
0.00%
0.00%

0.00%
0.00%
3.92%

1 .65%

1 .42%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.00
< 0.50
< 0.10

< 0.50
< 0.30


< 0.06
< 0.08
< 0.50
0.20
< 0.10
1.00
< 0.20
< 0.20
0.60

< 0.21
0.20

< 0.00
< 0.00
< 0.05
< 0.02
< 0.00


1.00
< 0.00
< 0.50

< 0.50
< 0.05
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
0.70

< 1.00
5.50
9.00
0.90
< 0.50

< 0.50
< 0.30


0.19
< 1.00
2.77
3.10
0.90
41.00
< 0.20
< 2.00
1.80

1.80
36.30

0.54
< 1.00
0.40
< 1.00
< 0.50


514.00
2.00
< 0.50

< 0.50
< 4.00
< 0.70

1.90

1.60
MAX
VALUE
(M9/L)
8.00
4.90

< 5.00
29.00
9.00
0.90
3.10

19.70
< 0.30


1.90
4.00
2.77
3.10
16.80
41.00
1.30
< 2.00
1.80

7.10
48.00

15.20
8.30
0.40
18.00
2.95


514.00
4.00
< 0.50

10.60
< 5.00
3.30

514.00

29.00
MIN
DETECTS
(M9/L)
0.30
0.70


0.20
0.11
0.70
0.10

0.60



0.18
0.87
0.90
0.20
0.10
1.00
0.20

0.60

0.21
0.20

0.14
8.20
0.30
0.60
0.23


1.00
0.10


0.50

0.40

0.10

0.10
MEDIAN
DETECTS
(M9/L)
3.65
1.45


2.10
2.00
0.80
0.80

11.70



1.00
2.00
1.20
0.65
0.40
3.50
0.40

1.00

1.30
1.10

0.61
8.25
0.40
1.05
1.05


1.70
0.10


1.40

2.10

1.40

1.50
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                               Occurrence of Unregulated Contaminants in Public Water Systems
Table A.9.C  URCIS (Round 1) Data- Carbon Tetrachloride Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,786
354

3,103
12,807
44
66
336

2,458
60


2,622
3,687
22
12
1,785
4
2,754
329
5

644
146

1,771
1,595
191
2,166
6,366


19
1,289
10

3,987
463
310

51,191

47,841
TOTAL
UNIQUE
PWS
686
132

971
3,530
17
1
13

1,162
19


394
525
13
7
844
4
1,565
85
2

297
58

1,242
590
10
356
1,686


12
418
3

992
69
144

15,847

15,266
#GW
PWS
555
94

895
3,501
12
0
11

1,053
15


349
291
9
3
798
4
1,540
71
2

254
56

1,239
555
8
253
1,556


4
396
0

937
32
116

14,609

14,176
# SW PWS
137
42

119
40
6
1
2

109
4


46
234
4
4
51
0
29
14
1

44
2

3
35
4
122
134


8
36
3

77
37
37

1,385

1,214
% PWS
>MRL
1.31%
2.27%

0.00%
1 .33%
41.18%
100.00%
15.38%

0.26%
0.00%


2.03%
3.05%
38.46%
71 .43%
4.74%
100.00%
1 .28%
0.00%
100.00%

6.06%
100.00%

1 .37%
0.17%
10.00%
1.12%
0.36%


100.00%
0.96%
0.00%

0.60%
0.00%
2.08%

1.91%

1 .32%
%GW
PWS
>MRL
1 .26%
3.19%

0.00%
1 .34%
33.33%
0.00%
18.18%

0.28%
0.00%


1.15%
2.06%
22.22%
100.00%
2.13%
100.00%
1 .23%
0.00%
100.00%

5.12%
100.00%

1 .37%
0.18%
12.50%
0.79%
0.39%


100.00%
1.01%
0.00%

0.64%
0.00%
0.86%

1 .60%

1 .09%
%SW
PWS
>MRL
1 .46%
0.00%

0.00%
0.00%
50.00%
100.00%
0.00%

0.00%
0.00%


8.70%
4.27%
75.00%
50.00%
47.06%
0.00%
3.45%
0.00%
100.00%

1 1 .36%
100.00%

0.00%
0.00%
0.00%
1 .64%
0.00%


100.00%
0.00%
0.00%

0.00%
0.00%
5.41%

5.05%

3.95%
% PWS
> 1/2 MCL
0.87%
0.76%

0.00%
0.54%
17.65%
0.00%
7.69%

0.17%
0.00%


0.00%
1.14%
7.69%
14.29%
0.24%
75.00%
0.00%
0.00%
0.00%

1 .35%
34.48%

0.08%
0.17%
0.00%
0.28%
0.06%


16.67%
0.24%
0.00%

0.40%
0.00%
0.69%

0.51%

0.32%
%GW
PWS
> 1/2 MCL
0.90%
1 .06%

0.00%
0.54%
16.67%
0.00%
9.09%

0.19%
0.00%


0.00%
1 .03%
0.00%
33.33%
0.13%
75.00%
0.00%
0.00%
0.00%

0.79%
33.93%

0.08%
0.18%
0.00%
0.00%
0.06%


50.00%
0.25%
0.00%

0.43%
0.00%
0.86%

0.48%

0.30%
%SW
PWS
> 1/2 MCL
0.73%
0.00%

0.00%
0.00%
16.67%
0.00%
0.00%

0.00%
0.00%


0.00%
1 .28%
25.00%
0.00%
1 .96%
0.00%
0.00%
0.00%
0.00%

4.55%
50.00%

0.00%
0.00%
0.00%
0.82%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.79%

0.58%
% PWS
>MCL
0.44%
0.00%

0.00%
0.34%
17.65%
0.00%
0.00%

0.09%
0.00%


0.00%
0.00%
0.00%
0.00%
0.24%
25.00%
0.00%
0.00%
0.00%

0.67%
24.14%

0.08%
0.17%
0.00%
0.28%
0.00%


16.67%
0.00%
0.00%

0.20%
0.00%
0.00%

0.28%

0.16%
%GW
PWS
>MCL
0.54%
0.00%

0.00%
0.34%
16.67%
0.00%
0.00%

0.09%
0.00%


0.00%
0.00%
0.00%
0.00%
0.13%
25.00%
0.00%
0.00%
0.00%

0.00%
25.00%

0.08%
0.18%
0.00%
0.00%
0.00%


50.00%
0.00%
0.00%

0.21%
0.00%
0.00%

0.27%

0.15%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
16.67%
0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
1 .96%
0.00%
0.00%
0.00%
0.00%

4.55%
0.00%

0.00%
0.00%
0.00%
0.82%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.36%

0.25%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy
The Maximum Contaminant Level (MCL) for Carbon Tetrachloride is 5 [ig/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A. 10.a URCIS (Round 1) Data- Chlorobenzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
698
131

944
3,515
11
1
13
234
1,163
127
1,002
1,301
369
524
13
2
844
2
1,565
85
1
565
297
1
2
1,523
590
8
357
2,655

303
1
414
3
1
992
137
145

20,539

20,038
# GW
PWS
566
93

874
3,491
7
0
11
49
1,054
112
963
1,187
331
291
9
2
798
2
1,540
71
0
523
254
0
2
1,498
555
7
253
2,492

156
0
394
0
1
937
63
116

18,702

18,337
# SW PWS
138
42

106
36
5
1
2
208
109
16
39
114
39
233
4
0
51
0
29
14
1
57
44
1
0
25
35
2
123
167

147
1
34
3
0
77
75
38

2,016

1,859
% PWS
>MRL
0.29%
6.11%

0.21 %
0.28%
18.18%
100.00%
15.38%
4.70%
0.26%
0.00%
0.40%
2.31 %
0.00%
0.00%
0.00%
100.00%
1 .07%
100.00%
0.00%
0.00%
100.00%
0.00%
1 .35%
100.00%
100.00%
0.92%
0.00%
0.00%
0.56%
0.08%

0.99%
100.00%
0.72%
0.00%
100.00%
0.00%
0.73%
0.00%

0.60%

0.53%
%GW
PWS
>MRL
0.35%
5.38%

0.23%
0.23%
0.00%
0.00%
9.09%
6.12%
0.00%
0.00%
0.10%
0.51 %
0.00%
0.00%
0.00%
100.00%
0.75%
100.00%
0.00%
0.00%
0.00%
0.00%
0.39%
0.00%
100.00%
0.67%
0.00%
0.00%
0.00%
0.04%

0.00%
0.00%
0.76%
0.00%
100.00%
0.00%
0.00%
0.00%

0.30%

0.26%
%sw
PWS
>MRL
0.00%
7.14%

0.00%
8.33%
40.00%
100.00%
50.00%
3.85%
2.75%
0.00%
7.69%
21 .05%
0.00%
0.00%
0.00%
0.00%
5.88%
0.00%
0.00%
0.00%
100.00%
0.00%
6.82%
100.00%
0.00%
16.00%
0.00%
0.00%
1 .63%
0.60%

2.04%
100.00%
0.00%
0.00%
0.00%
0.00%
1 .33%
0.00%

3.37%

3.17%
% PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01 %

0.00%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
99% VALUE
(M9/L)
< 0.00
0.80

< 1.00
< 1.00
2.00
3.00
< 0.50
1.10
< 0.50
< 0.30
< 1.00
0.02
< 2.00
< 1.00
< 0.50
1.10
1.00
213.00
< 0.50
< 2.00
1.00
< 1.00
< 0.50
0.15
0.67
< 1.00
< 1.00
< 0.20
< 1.00
< 1.00

< 0.50
2.00
10.00
< 1.00
0.50
< 0.50
< 4.00
< 0.90

< 1.00

< 1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Chlorobenzene is 100 |jg/L.
The highlighted States are part of the  URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.IO.b  URCIS (Round 1) Data- Chlorobenzene Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
698
131

944
3,515
11
1
13
234
1,163
127
1,002
1,301
369
524
13
2
844
2
1,565
85
1
565
297
1
2
1,523
590
8
357
2,655

303
1
414
3
1
992
137
145

20,539

20,038
TOTAL #
SAMPLES
1,957
352

2,936
1 1 ,679
35
63
333
340
2,465
1,221
1,909
5,341
1,949
2,311
22
2
1,786
52
2,757
321
1
1,623
644
1
2
3,172
1,595
148
2,572
16,085

1,221
1
1,283
10
1
3,987
395
313

70,885

67,321
#GW
SAMPLES
1,653
244

2,275
1 1 ,577
30
0
189
79
1,866
1,081
1,697
4,336
1,526
1,172
18
2
1,306
52
2,678
295
0
1,376
569
0
2
2,806
1,475
136
1,878
15,165

434
0
1,172
0
1
3,656
164
259

61,169

58,566
#SW
SAMPLES
304
108

661
102
5
63
144
261
599
140
212
1,005
423
1,139
4
0
480
0
79
26
1
247
75
1
0
366
120
12
694
920

787
1
111
10
0
331
231
54

9,716

8,755
% TOTAL
SAMPLES
>MRL
0.10%
3.13%

0.07%
0.18%
5.71%
1 .59%
0.60%
4.41 %
0.12%
0.00%
0.31 %
1 .01 %
0.00%
0.00%
0.00%
100.00%
0.67%
100.00%
0.00%
0.00%
100.00%
0.00%
0.62%
100.00%
100.00%
0.63%
0.00%
0.00%
0.08%
0.02%

0.33%
100.00%
0.55%
0.00%
100.00%
0.00%
0.25%
0.00%

0.33%

0.25%
%GW
SAMPLES
>MRL
0.12%
3.28%

0.09%
0.12%
0.00%

0.53%
7.59%
0.00%
0.00%
0.06%
0.39%
0.00%
0.00%
0.00%
100.00%
0.61%
100.00%
0.00%
0.00%

0.00%
0.18%

100.00%
0.57%
0.00%
0.00%
0.00%
0.01%

0.00%

0.60%

100.00%
0.00%
0.00%
0.00%

0.23%

0.14%
%SW
SAMPLES
>MRL
0.00%
2.78%

0.00%
6.86%
40.00%
1 .59%
0.69%
3.45%
0.50%
0.00%
2.36%
3.68%
0.00%
0.00%
0.00%

0.83%

0.00%
0.00%
100.00%
0.00%
4.00%
100.00%

1 .09%
0.00%
0.00%
0.29%
0.22%

0.51 %
100.00%
0.00%
0.00%

0.00%
0.43%
0.00%

0.94%

0.94%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.04
< 0.50
< 0.00
< 0.00
< 0.50
< 0.00
< 0.20
< 0.02
< 0.09
< 0.50
< 0.50
0.91
< 0.10
2.00
< 0.20
< 0.20
1.00
< 0.50
< 0.50
0.15
0.51
< 0.00
< 0.00
< 0.20
< 0.02
< 0.08

< 0.01
2.00
< 0.10
< 1.00
0.50
< 0.50
< 0.20
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
0.80

< 1.00
< 1.00
2.00
3.00
< 0.50
1.10
< 0.50
< 0.30
< 1.00
0.02
< 2.00
< 1.00
< 0.50
1.10
1.00
213.00
< 0.50
< 2.00
1.00
< 1.00
< 0.50
0.15
0.67
< 1.00
< 1.00
< 0.20
< 1.00
< 1.00

< 0.50
2.00
10.00
< 1.00
0.50
< 0.50
< 4.00
< 0.90

< 1.00

< 1.00
MAX
VALUE
(M9/L)
0.20
1.60

2.00
10.00
2.00
3.00
1.90
30.00
0.50
< 1.00
2.80
7.80
< 5.00
< 1.00
< 0.50
1.10
5.00
213.00
< 2.00
< 2.00
1.00
< 1.00
4.80
0.15
0.67
24.80
< 5.00
< 0.20
8.00
4.90

1.80
2.00
0.10
< 1.00
0.50
< 0.50
3.10
< 1.00

213.00

30.00
MIN
DETECTS
(M9/L)
0.20
0.50

1.00
0.10
0.68
3.00
1.00
0.05
0.50

0.60
0.02



0.91
0.10
2.00


1.00

0.90
0.15
0.51
0.14


0.60
2.00

0.60
2.00
0.10

0.50

3.10


0.02

0.02
MEDIAN
DETECTS
(M9/L)
0.20
0.70

1.50
1.40
1.34
3.00
1.45
1.00
0.50

0.85
1.40



1.01
0.80
21.00


1.00

1.80
0.15
0.59
1.04


4.30
2.50

1.05
2.00
0.10

0.50

3.10


1.40

1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                               Occurrence of Unregulated Contaminants in Public Water Systems
Table A.10.C  URCIS (Round 1) Data- Chlorobenzene Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,957
352

2,936
11,679
35
63
333
340
2,465
1,221
1,909
5,341
1,949
2,311
22
2
1,786
52
2,757
321
1
1,623
644
1
2
3,172
1,595
148
2,572
16,085

1,221
1
1,283
10
1
3,987
395
313

70,885

67,321
TOTAL
UNIQUE
PWS
698
131

944
3,515
11
1
13
234
1,163
127
1,002
1,301
369
524
13
2
844
2
1,565
85
1
565
297
1
2
1,523
590
8
357
2,655

303
1
414
3
1
992
137
145

20,539

20,038
#GW
PWS
566
93

874
3,491
7
0
11
49
1,054
112
963
1,187
331
291
9
2
798
2
1,540
71
0
523
254
0
2
1,498
555
7
253
2,492

156
0
394
0
1
937
63
116

18,702

18,337
# SW PWS
138
42

106
36
5
1
2
208
109
16
39
114
39
233
4
0
51
0
29
14
1
57
44
1
0
25
35
2
123
167

147
1
34
3
0
77
75
38

2,016

1,859
% PWS
>MRL
0.29%
6.11%

0.21%
0.28%
18.18%
100.00%
15.38%
4.70%
0.26%
0.00%
0.40%
2.31%
0.00%
0.00%
0.00%
100.00%
1 .07%
100.00%
0.00%
0.00%
100.00%
0.00%
1 .35%
100.00%
100.00%
0.92%
0.00%
0.00%
0.56%
0.08%

0.99%
100.00%
0.72%
0.00%
100.00%
0.00%
0.73%
0.00%

0.60%

0.53%
%GW
PWS
>MRL
0.35%
5.38%

0.23%
0.23%
0.00%
0.00%
9.09%
6.12%
0.00%
0.00%
0.10%
0.51%
0.00%
0.00%
0.00%
100.00%
0.75%
100.00%
0.00%
0.00%
0.00%
0.00%
0.39%
0.00%
100.00%
0.67%
0.00%
0.00%
0.00%
0.04%

0.00%
0.00%
0.76%
0.00%
100.00%
0.00%
0.00%
0.00%

0.30%

0.26%
%sw
PWS
>MRL
0.00%
7.14%

0.00%
8.33%
40.00%
100.00%
50.00%
3.85%
2.75%
0.00%
7.69%
21.05%
0.00%
0.00%
0.00%
0.00%
5.88%
0.00%
0.00%
0.00%
100.00%
0.00%
6.82%
100.00%
0.00%
16.00%
0.00%
0.00%
1 .63%
0.60%

2.04%
100.00%
0.00%
0.00%
0.00%
0.00%
1 .33%
0.00%

3.37%

3.17%
% PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01%

0.00%
%sw
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01%

0.00%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy
The Maximum Contaminant Level (MCL) for Chlorobenzene is 100 [ig/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.11.a URCIS (Round 1) Data-  Chloroethane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
662
131

944
3,494
9
1
13
226
1,162
127
805
1,302
365
524
13
3
986

1,553
85
6
565
297


1,517
590
8
355
2,654
335
303
3
420
3
1
992
137
145

20,736

20,236
# GW
PWS
532
93

874
3,465
7
0
11
44
1,053
112
766
1,187
327
291
9
3
940

1,529
71
6
523
254


1,492
555
7
252
2,492
306
156
2
400

1
937
63
116

18,876

18,507
# SW PWS
135
42

106
39
3
1
2
203
109
16
39
115
39
233
4
0
51

28
14
0
57
44


25
35
2
122
166
29
147
1
34
3
0
77
75
38

2,034

1,882
% PWS
>MRL
0.30%
3.82%

0.00%
0.11%
11.11%
0.00%
15.38%
4.42%
0.09%
0.00%
0.00%
0.46%
0.00%
0.38%
0.00%
100.00%
0.41 %

0.13%
0.00%
100.00%
0.18%
0.34%


0.26%
0.00%
0.00%
0.28%
0.98%
0.60%
0.00%
100.00%
1 .43%
0.00%
100.00%
0.00%
1 .46%
0.00%

0.46%

0.39%
%GW
PWS
>MRL
0.19%
1 .08%

0.00%
0.09%
14.29%
0.00%
18.18%
4.55%
0.09%
0.00%
0.00%
0.42%
0.00%
0.34%
0.00%
100.00%
0.32%

0.13%
0.00%
100.00%
0.00%
0.39%


0.13%
0.00%
0.00%
0.40%
0.96%
0.65%
0.00%
100.00%
1 .25%
0.00%
100.00%
0.00%
1 .59%
0.00%

0.37%

0.29%
%sw
PWS
>MRL
0.74%
9.52%

0.00%
5.13%
0.00%
0.00%
0.00%
3.94%
0.00%
0.00%
0.00%
0.87%
0.00%
0.43%
0.00%
0.00%
1 .96%

0.00%
0.00%
0.00%
1 .75%
0.00%


8.00%
0.00%
0.00%
0.00%
1 .20%
0.00%
0.00%
100.00%
2.94%
0.00%
0.00%
0.00%
1 .33%
0.00%

1 .28%

1 .33%
% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level
(HRL), Maximum Contaminant
Level (MCL), or Health Advisory
Level (HAL) for Chloroethane.




























































99% VALUE
(M9/L)
< 0.00
0.80

< 1.00
< 0.60
16.00
< 0.50
< 0.90
1.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50
1.90
< 1.00

< 1.00
< 2.00
3.10
< 1.00
< 0.50


< 2.64
< 1.00
< 0.20
< 1.00
< 2.00
< 0.15
< 0.50
5.00
< 10.00
< 1.00
1.00
< 0.50
< 4.00
< 2.00

< 2.00

< 2.00
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.11.b URCIS (Round 1) Data- Chloroethane Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
662
131

944
3,494
9
1
13
226
1,162
127
805
1,302
365
524
13
3
986

1,553
85
6
565
297


1,517
590
8
355
2,654
335
303
3
420
3
1
992
137
145

20,736

20,236
TOTAL #
SAMPLES
1,610
351

2,916
11,461
36
63
336
324
2,464
1,221
1,211
6,001
1,939
2,311
22
5
1,909

2,656
321
6
1,624
644


3,165
1,595
148
2,160
15,957
444
1,221
4
1,319
10
1
3,987
390
313

70,145

67,033
#GW
SAMPLES
1,323
244

2,256
1 1 ,376
33
0
191
71
1,865
1,081
1,035
5,034
1,518
1,172
18
5
1,441

2,588
295
6
1,376
569


2,799
1,475
136
1,615
15,039
363
434
3
1,205
0
1
3,656
163
259

60,645

58,342
#SW
SAMPLES
287
107

660
85
3
63
145
253
599
140
176
967
421
1,139
4
0
468

68
26
0
248
75


366
120
12
545
918
81
787
1
114
10
0
331
227
54

9,500

8,691
% TOTAL
SAMPLES
>MRL
0.12%
1.71%

0.00%
0.07%
8.33%
0.00%
0.60%
3.40%
0.04%
0.00%
0.00%
0.15%
0.00%
0.09%
0.00%
100.00%
0.26%

0.08%
0.00%
100.00%
0.06%
0.16%


0.16%
0.00%
0.00%
0.19%
0.20%
1.13%
0.00%
100.00%
0.76%
0.00%
100.00%
0.00%
0.51%
0.00%

0.18%

0.15%
%GW
SAMPLES
>MRL
0.08%
0.41%

0.00%
0.05%
9.09%
0.00%
1 .05%
4.23%
0.05%
0.00%
0.00%
0.16%
0.00%
0.09%
0.00%
100.00%
0.28%

0.08%
0.00%
100.00%
0.00%
0.18%


0.07%
0.00%
0.00%
0.25%
0.19%
1 .38%
0.00%
100.00%
0.75%
0.00%
100.00%
0.00%
0.61%
0.00%

0.16%

0.13%
%SW
SAMPLES
>MRL
0.35%
4.67%

0.00%
2.35%
0.00%
0.00%
0.00%
3.16%
0.00%
0.00%
0.00%
0.10%
0.00%
0.09%
0.00%
0.00%
0.21%

0.00%
0.00%
0.00%
0.40%
0.00%


0.82%
0.00%
0.00%
0.00%
0.33%
0.00%
0.00%
100.00%
0.88%
0.00%
0.00%
0.00%
0.44%
0.00%

0.31 %

0.32%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.10
< 0.50
< 0.40
< 0.00
< 0.50
< 0.00
< 0.10
< 0.00
< 0.10
< 0.50
< 0.50
0.13
< 0.10

< 1.00
< 0.20
0.70
< 0.50
< 0.50


< 0.00
< 0.00
< 0.20
< 0.10
< 0.20
0.15
< 0.10
1.60
< 0.10
< 1.00
1.00
< 0.50
< 0.20
< 0.40

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
0.80

< 1.00
< 0.60
16.00
< 0.50
< 0.90
1.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50
1.90
< 1.00

< 1.00
< 2.00
3.10
< 1.00
< 0.50


< 2.64
< 1.00
< 0.20
< 1.00
< 2.00
< 0.15
< 0.50
5.00
< 10.00
< 1.00
1.00
< 0.50
< 4.00
< 2.00

< 2.00

< 2.00
MAX
VALUE
(M9/L)
21.00
112.00

< 10.00
22.00
16.00
< 0.50
9.70
10.40
0.70
< 0.30
< 1.00
59.00
< 10.00
2.00
< 0.50
1.90
8.00

9.00
< 2.00
3.10
7.80
1.16


8.00
< 5.00
< 0.20
5.00
26.00
0.15
0.50
5.00
1.00
< 1.00
1.00
< 0.50
64.00
< 2.00

112.00

112.00
MIN
DETECTS
(M9/L)
2.70
0.55


0.90
1.80

3.00
0.10
0.70


0.22

1.00

0.13
0.10

5.20

0.70
7.80
1.16


1.00


1.00
0.60
0.15

1.60
0.50

1.00

25.00


0.10

0.10
MEDIAN
DETECTS
(M9/L)
11.85
1.10


3.90
6.90

6.35
1.00
0.70


0.50

1.50

0.90
0.20

7.10

0.75
7.80
1.16


1.20


4.00
1.18
0.15

1.95
0.50

1.00

44.50


1.00

1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                             Occurrence of Unregulated Contaminants in Public Water Systems
Table A. 11.c  URCIS (Round 1) Data- Chloroethane Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,610
351

2,916
11,461
36
63
336
324
2,464
1,221
1,211
6,001
1,939
2,311
22
5
1,909

2,656
321
6
1,624
644


3,165
1,595
148
2,160
15,957
444
1,221
4
1,319
10
1
3,987
390
313

70,145

67,033
TOTAL
UNIQUE
PWS
662
131

944
3,494
9
1
13
226
1,162
127
805
1,302
365
524
13
3
986

1,553
85
6
565
297


1,517
590
8
355
2,654
335
303
3
420
3
1
992
137
145

20,736

20,236
#GW
PWS
532
93

874
3,465
7
0
11
44
1,053
112
766
1,187
327
291
9
3
940

1,529
71
6
523
254


1,492
555
7
252
2,492
306
156
2
400
0
1
937
63
116

18,876

18,507
# SW PWS
135
42

106
39
3
1
2
203
109
16
39
115
39
233
4
0
51

28
14
0
57
44


25
35
2
122
166
29
147
1
34
3
0
77
75
38

2,034

1,882
% PWS
>MRL
0.30%
3.82%

0.00%
0.11%
11.11%
0.00%
15.38%
4.42%
0.09%
0.00%
0.00%
0.46%
0.00%
0.38%
0.00%
100.00%
0.41%

0.13%
0.00%
100.00%
0.18%
0.34%


0.26%
0.00%
0.00%
0.28%
0.98%
0.60%
0.00%
100.00%
1 .43%
0.00%
100.00%
0.00%
1 .46%
0.00%

0.46%

0.39%
%GW
PWS
>MRL
0.19%
1 .08%

0.00%
0.09%
14.29%
0.00%
18.18%
4.55%
0.09%
0.00%
0.00%
0.42%
0.00%
0.34%
0.00%
100.00%
0.32%

0.13%
0.00%
100.00%
0.00%
0.39%


0.13%
0.00%
0.00%
0.40%
0.96%
0.65%
0.00%
100.00%
1 .25%
0.00%
100.00%
0.00%
1 .59%
0.00%

0.37%

0.29%
%SW
PWS
>MRL
0.74%
9.52%

0.00%
5.13%
0.00%
0.00%
0.00%
3.94%
0.00%
0.00%
0.00%
0.87%
0.00%
0.43%
0.00%
0.00%
1.96%

0.00%
0.00%
0.00%
1 .75%
0.00%


8.00%
0.00%
0.00%
0.00%
1 .20%
0.00%
0.00%
100.00%
2.94%
0.00%
0.00%
0.00%
1 .33%
0.00%

1 .28%

1 .33%
% PWS
> 1/2 MCL

















%GW
PWS
> 1/2 MCL

















%SW
PWS
> 1/2 MCL

















% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level (HRL), Maximum
Contaminant Level (MCL), or Health Advisory Level (HAL) for
Chloroethane.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for labor;
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.12.a  URCIS (Round 1)  Data- Chloroform Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE PWS
677
146

944
3,647
9
1
13
730
1,162
127
1,002
1,300
390
524
13
170
986
39
1,564
85
121
565
297
68
135
1,516
590
10
246
1,686
335
303

424
3
125
992
132
145

21,222

20,184
# GW PWS
545
102

874
3,572
7
0
11
117
1,053
112
963
1,185
342
291
9
94
940
37
1,539
71
120
523
254
64
83
1,491
555
8
175
1,556
306
156

403
0
82
937
58
116

18,751

17,990
# SW PWS
138
50

108
119
3
1
2
671
109
16
39
115
49
233
4
90
51
2
29
14
4
57
44
4
58
25
35
3
81
134
29
147

35
3
43
77
75
38

2,735

2,423
% PWS
>MRL
27.77%
39.73%

9.43%
11.68%
77.78%
100.00%
69.23%
79.86%
35.20%
25.98%
48.10%
56.23%
35.90%
77.86%
61.54%
94.71%
18.05%
100.00%
22.83%
34.12%
100.00%
21.24%
10.10%
100.00%
100.00%
19.20%
4.92%
50.00%
46.34%
29.83%
31.64%
64.36%

14.15%
100.00%
85.60%
27.22%
70.45%
52.41%

31.39%

28.63%
% GW PWS
>MRL
17.61%
21.57%

5.38%
9.97%
71.43%
0.00%
63.64%
64.10%
28.77%
16.96%
46.11%
52.07%
26.90%
63.92%
44.44%
93.62%
14.36%
100.00%
21.70%
23.94%
100.00%
14.53%
6.30%
100.00%
100.00%
17.84%
1.80%
37.50%
26.29%
24.29%
25.49%
31.41%

10.42%
0.00%
78.05%
22.73%
39.66%
43.10%

23.81%

21.55%
% SW PWS
>MRL
69.57%
78.00%

38.89%
84.87%
100.00%
100.00%
100.00%
81.67%
97.25%
93.75%
97.44%
99.13%
97.96%
95.28%
100.00%
96.67%
88.24%
100.00%
89.66%
85.71%
100.00%
85.96%
31.82%
100.00%
100.00%
100.00%
54.29%
100.00%
85.19%
94.78%
96.55%
99.32%

62.86%
100.00%
100.00%
94.81%
93.33%
84.21%

85.56%

83.08%
% PWS
>HRL
0.15%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%
0.14%
0.00%
0.00%
0.20%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.02%

0.02%
% GW PWS
>HRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.10%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01%

0.01%
% SW PWS
>HRL
0.72%
0.00%

0.00%
0.84%
0.00%
0.00%
0.00%
0.15%
0.00%
0.00%
2.56%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.15%

0.17%
99% VALUE
(M9/L)
105.20
61.40

41.20
36.00
27.63
110.00
125.70
240.00
111.90
72.40
116.00
144.00
93.00
189.00
26.30
120.00
45.70
60.00
27.00
68.00
91.40
50.00
160.00
45.20
150.00
45.00
25.80
31.00
93.30
58.40
64.40
70.20

53.20
13.00
128.00
47.70
99.00
79.00

91.50

87.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for
laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Chloroform is 600 |jg/L.  This is a draft value for working review only.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                         Occurrence of Unregulated Contaminants in Public Water Systems
Table A.12.b URCIS (Round 1) Data- Chloroform Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE PWS
677
146

944
3,647
9
1
13
730
1,162
127
1,002
1,300
390
524
13
170
986
39
1,564
85
121
565
297
68
135
1,516
590
10
246
1,686
335
303

424
3
125
992
132
145

21,222

20,184
TOTAL #
SAMPLES
1,708
446

3,152
14,668
33
61
386
1,035
2,464
1,221
2,287
5,994
2,527
2,312
22
915
1,909
51
2,751
328
250
1,624
644
142
456
3,163
1,595
157
1,466
6,373
444
1,220

1,334
10
642
3,987
655
313

68,745

63,826
#GW
SAMPLES
1,380
278

2,402
13,986
30
0
228
170
1,865
1,081
1,861
5,036
1,569
1,172
18
574
1,441
49
2,672
296
224
1,376
569
126
133
2,797
1,475
139
1,006
5,759
363
434

1,218
0
143
3,656
196
259

55,981

53,015
#SW
SAMPLES
328
168

750
682
3
61
158
865
599
140
426
958
958
1,140
4
341
468
2
79
32
26
248
75
16
323
366
120
18
460
614
81
786

116
10
499
331
459
54

12,764

10,811
% TOTAL
SAMPLES
>MRL
24.41%
21.97%

8.50%
22.10%
45.45%
96.72%
61.92%
76.33%
38.23%
9.99%
46.74%
42.23%
45.67%
64.40%
45.45%
96.50%
22.11%
100.00%
20.83%
16.16%
100.00%
20.01%
6.37%
100.00%
100.00%
19.92%
4.76%
40.13%
30.70%
17.09%
37.61%
78.93%

11.09%
50.00%
93.61%
23.18%
78.78%
37.70%

31.11%

28.38%
%GW
SAMPLES
>MRL
13.77%
13.31%

3.54%
18.89%
40.00%
0.00%
44.74%
54.71%
23.22%
3.89%
37.18%
32.80%
20.01%
40.44%
33.33%
95.82%
15.20%
100.00%
18.75%
8.11%
100.00%
10.17%
2.99%
100.00%
100.00%
15.48%
1.15%
39.57%
11.53%
11.56%
24.79%
51.15%

5.75%
0.00%
76.92%
17.83%
45.41%
27.80%

20.27%

18.56%
%SW
SAMPLES
>MRL
69.21%
36.31%

24.40%
87.83%
100.00%
96.72%
86.71%
80.58%
84.97%
57.14%
88.50%
91.75%
87.68%
89.04%
100.00%
97.65%
43.38%
100.00%
91.14%
90.63%
100.00%
74.60%
32.00%
100.00%
100.00%
53.83%
49.17%
44.44%
72.61%
68.89%
95.06%
94.27%

67.24%
50.00%
98.40%
82.18%
93.03%
85.19%

78.67%

76.51%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.50
< 0.00
< 0.03
< 0.00
< 0.00
< 0.00
< 0.50
< 0.00
< 0.00
< 0.02
< 0.06
< 0.50
< 0.50
< 0.00
< 0.10
1.00
< 0.10
< 0.50
0.50
< 0.00
< 0.50
0.30
0.50
< 0.00
< 0.00
< 0.20
< 0.03
< 0.00
< 0.15
< 0.00

< 0.00
< 1.00
< 0.00
< 0.50
< 0.00
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
105.20
61.40

41.20
36.00
27.63
110.00
125.70
240.00
111.90
72.40
116.00
144.00
93.00
189.00
26.30
120.00
45.70
60.00
27.00
68.00
91.40
50.00
160.00
45.20
150.00
45.00
25.80
31.00
93.30
58.40
64.40
70.20

53.20
13.00
128.00
47.70
99.00
79.00

91.50

87.00
MAX VALUE
(M9/L)
624.80
95.80

500.00
620.00
27.63
110.00
127.10
1,883.00
168.20
251.00
1,700.00
390.00
165.00
393.00
26.30
290.00
119.00
60.00
490.00
91.00
134.20
110.00
320.00
306.40
202.00
111.50
72.40
53.00
460.00
344.00
103.00
107.20

188.00
13.00
164.00
321.90
160.00
114.00

1,883.00

1,883.00
MIN
DETECTS
(M9/L)
0.01
0.53

0.40
0.05
0.28
6.70
0.10
0.01
0.50
0.30
0.50
0.35
0.08
0.50
0.80
0.05
0.10
1.00
0.10
1.00
0.50
0.50
0.80
0.30
0.50
0.04
0.50
0.20
0.20
0.46
0.15
0.05

0.10
1.20
0.02
0.50
0.53
0.20

0.01

0.01
MEDIAN
DETECTS
(M9/L)
6.20
12.55

16.00
1.60
3.74
39.50
21.20
10.00
10.10
6.60
6.00
4.60
17.40
14.00
2.45
2.10
3.50
2.00
1.00
22.00
1.90
7.40
106.00
1.55
19.77
2.00
6.85
2.60
7.95
4.00
2.76
12.70

8.00
6.80
30.00
2.90
24.00
10.10

5.00

4.80
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.12.C URCIS (Round 1) Data- Chloroform Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL #
SAMPLES
1,708
446

3,152
14,668
33
61
386
1,035
2,464
1,221
2,287
5,994
2,527
2,312
22
915
1,909
51
2,751
328
250
1,624
644
142
456
3,163
1,595
157
1,466
6,373
444
1,220

1,334
10
642
3,987
655
313

68,745

63,826
TOTAL
UNIQUE PWS
677
146

944
3,647
9
1
13
730
1,162
127
1,002
1,300
390
524
13
170
986
39
1,564
85
121
565
297
68
135
1,516
590
10
246
1,686
335
303

424
3
125
992
132
145

21,222

20,184
3GWPWS
545
102

874
3,572
7
0
11
117
1,053
112
963
1,185
342
291
9
94
940
37
1,539
71
120
523
254
64
83
1,491
555
8
175
1,556
306
156

403
0
82
937
58
116

18,751

17,990
3SWPWS
138
50

108
119
3
1
2
671
109
16
39
115
49
233
4
90
51
2
29
14
4
57
44
4
58
25
35
3
81
134
29
147

35
3
43
77
75
38

2,735

2,423
%PWS
>MRL
27.77%
39.73%

9.43%
1 1 .68%
77.78%
100.00%
69.23%
79.86%
35.20%
25.98%
48.10%
56.23%
35.90%
77.86%
61.54%
94.71%
18.05%
100.00%
22.83%
34.12%
100.00%
21.24%
10.10%
100.00%
100.00%
19.20%
4.92%
50.00%
46.34%
29.83%
31.64%
64.36%

14.15%
100.00%
85.60%
27.22%
70.45%
52.41%

31.39%

28.63%
% GW PWS
>MRL
17.61%
21.57%

5.38%
9.97%
71.43%
0.00%
63.64%
64.10%
28.77%
16.96%
46.11%
52.07%
26.90%
63.92%
44.44%
93.62%
14.36%
100.00%
21.70%
23.94%
100.00%
14.53%
6.30%
100.00%
100.00%
17.84%
1.80%
37.50%
26.29%
24.29%
25.49%
31.41%

10.42%
0.00%
78.05%
22.73%
39.66%
43.10%

23.81%

21.55%
% SW PWS
>MRL
69.57%
78.00%

38.89%
84.87%
100.00%
100.00%
100.00%
81.67%
97.25%
93.75%
97.44%
99.13%
97.96%
95.28%
100.00%
96.67%
88.24%
100.00%
89.66%
85.71%
100.00%
85.96%
31.82%
100.00%
100.00%
100.00%
54.29%
100.00%
85.19%
94.78%
96.55%
99.32%

62.86%
100.00%
100.00%
94.81%
93.33%
84.21%

85.56%

83.08%
% PWS
> 1/2 HRL
0.44%
0.00%

0.11%
0.05%
0.00%
0.00%
0.00%
0.96%
0.00%
0.00%
0.30%
0.31%
0.00%
0.38%
0.00%
0.00%
0.00%
0.00%
0.06%
0.00%
0.00%
0.00%
0.34%
1.47%
0.00%
0.00%
0.00%
0.00%
0.41%
0.06%
0.00%
0.00%

0.00%
0.00%
0.00%
0.10%
0.00%
0.00%

0.13%

0.13%
% GW PWS
> 1/2 HRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
1.71%
0.00%
0.00%
0.10%
0.08%
0.00%
0.34%
0.00%
0.00%
0.00%
0.00%
0.06%
0.00%
0.00%
0.00%
0.00%
1 .56%
0.00%
0.00%
0.00%
0.00%
0.57%
0.06%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.05%

0.04%
% SW PWS
> 1/2 HRL
2.17%
0.00%

0.93%
1.68%
0.00%
0.00%
0.00%
0.75%
0.00%
0.00%
5.13%
2.61%
0.00%
0.43%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.27%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
1.30%
0.00%
0.00%

0.69%

0.78%
%PWS
>HRL
0.15%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%
0.14%
0.00%
0.00%
0.20%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.02%

0.02%
% GW PWS
>HRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.10%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01%

0.01%
% SW PWS
>HRL
0.72%
0.00%

0.00%
0.84%
0.00%
0.00%
0.00%
0.15%
0.00%
0.00%
2.56%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.15%

0.17%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Chloroform is 600 Mg/L. This is a draft value for working review only.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A. 13.a URCIS (Round 1) Data- Chloromethane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
662
131
1
943
3,509
11
1
13
227
1,161
127
805
1,302
367
524
13
5
986

1,553
85
32
565
297
34

1,517
590
8
355
2,654
335
303
7
414
3
1
992
137
145

20,815

20,246
# GW
PWS
534
93
0
873
3,473
9

11
46
1,052
112
766
1,187
329
291
9
4
940

1,529
71
32
523
254
33

1,492
555
7
252
2,492
306
156
6
394

1
937
63
116

18,948

18,513
# SW PWS
134
42
1
106
52
3
1
2
204
109
16
39
115
39
233
4
1
51

28
14
1
57
44
1

25
35
2
122
166
29
147
1
33
3

77
75
38

2,050

1,894
% PWS
>MRL
0.91 %
10.69%
100.00%
0.00%
0.46%
18.18%
0.00%
0.00%
3.52%
0.00%
0.00%
0.12%
1 .31 %
1 .63%
10.50%
0.00%
100.00%
0.41 %

0.13%
0.00%
100.00%
0.00%
4.71 %
100.00%

0.73%
0.00%
0.00%
0.85%
2.15%
3.58%
0.33%
100.00%
1 .93%
0.00%
100.00%
1.11%
1 .46%
2.07%

1 .60%

1 .22%
%GW
PWS
>MRL
0.75%
6.45%
0.00%
0.00%
0.40%
22.22%
0.00%
0.00%
4.35%
0.00%
0.00%
0.00%
0.84%
0.91 %
17.53%
0.00%
100.00%
0.43%

0.13%
0.00%
100.00%
0.00%
4.33%
100.00%

0.67%
0.00%
0.00%
0.79%
2.29%
3.27%
0.00%
100.00%
1 .52%
0.00%
100.00%
1.17%
1 .59%
2.59%

1 .50%

1.11%
%sw
PWS
>MRL
1 .49%
19.05%
100.00%
0.00%
3.85%
0.00%
0.00%
0.00%
2.94%
0.00%
0.00%
2.56%
6.09%
7.69%
1 .72%
0.00%
100.00%
0.00%

0.00%
0.00%
100.00%
0.00%
6.82%
100.00%

4.00%
0.00%
0.00%
0.82%
0.00%
6.90%
0.68%
100.00%
6.06%
0.00%
0.00%
0.00%
1 .33%
0.00%

2.39%

2.27%
% PWS
>MCL
0.60%
3.82%
100.00%
0.00%
0.17%
0.00%
0.00%
0.00%
1 .76%
0.00%
0.00%
0.12%
0.38%
0.27%
6.49%
0.00%
40.00%
0.20%

0.06%
0.00%
3.13%
0.00%
0.67%
35.29%

0.13%
0.00%
0.00%
0.00%
0.72%
0.00%
0.33%
71 .43%
0.24%
0.00%
0.00%
0.20%
1 .46%
0.00%

0.54%

0.45%
%GW
PWS
>MCL
0.37%
2.15%
0.00%
0.00%
0.17%
0.00%
0.00%
0.00%
2.17%
0.00%
0.00%
0.00%
0.08%
0.30%
1 1 .34%
0.00%
25.00%
0.21 %

0.07%
0.00%
3.13%
0.00%
0.79%
33.33%

0.13%
0.00%
0.00%
0.00%
0.76%
0.00%
0.00%
66.67%
0.25%
0.00%
0.00%
0.21 %
1 .59%
0.00%

0.49%

0.41 %
%sw
PWS
>MCL
1 .49%
7.14%
100.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .47%
0.00%
0.00%
2.56%
3.48%
0.00%
0.43%
0.00%
100.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
100.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.68%
100.00%
0.00%
0.00%
0.00%
0.00%
1 .33%
0.00%

0.98%

0.84%
99% VALUE
(M9/L)
< 0.00
4.80
5.50
< 2.00
< 2.00
1.70
< 0.50
< 2.00
5.00
< 0.50
< 0.30
< 1.00
< 2.00
< 4.00
7.00
< 0.50
8.10
< 1.00

< 2.00
< 2.00
5.10
< 1.00
2.00
44.60

< 4.12
< 1.00
< 0.20
< 1.00
< 2.00
0.15
< 0.50
12.00
< 10.00
< 1.00
1.00
< 0.50
< 4.00
1.40

< 4.00

< 4.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Chloromethane is 3 |jg/L.
The highlighted States are part of the  URCIS 24 State Cross-Section.

-------
                          Occurrence of Unregulated Contaminants in Public Water Systems
Table A.13.b URCIS (Round 1) Data- Chloromethane Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
662
131
1
943
3,509
11
1
13
227
1,161
127
805
1,302
367
524
13
5
986

1,553
85
32
565
297
34

1,517
590
8
355
2,654
335
303
7
414
3
1
992
137
145

20,815

20,246
TOTAL #
SAMPLES
1,625
351
2
2,931
12,342
36
63
333
341
2,461
1,220
1,212
5,999
1,941
2,311
22
5
1,908

2,654
322
42
1,621
647
41

3,165
1,595
148
2,168
15,954
444
1,221
8
1,307
10
1
3,987
390
313

71,141

67,940
#GW
SAMPLES
1,338
244
0
2,271
12,105
33
0
189
76
1,863
1,080
1,035
5,034
1,520
1,172
18
4
1,440

2,586
296
41
1,376
572
39

2,799
1,475
136
1,619
15,039
363
434
6
1,194
0
1
3,656
163
259

61,476

59,094
#SW
SAMPLES
287
107
2
660
237
3
63
144
265
598
140
177
965
421
1,139
4
1
468

68
26
1
245
75
2

366
120
12
549
915
81
787
2
113
10
0
331
227
54

9,665

8,846
% TOTAL
SAMPLES
>MRL
0.49%
4.84%
100.00%
0.00%
0.16%
8.33%
0.00%
0.00%
2.64%
0.00%
0.00%
0.08%
0.32%
0.52%
4.28%
0.00%
100.00%
0.21%

0.08%
0.00%
100.00%
0.00%
4.79%
100.00%

0.41%
0.00%
0.00%
0.14%
0.51%
3.83%
0.08%
100.00%
0.92%
0.00%
100.00%
0.43%
0.51%
1.92%

0.67%

0.54%
%GW
SAMPLES
>MRL
0.45%
3.69%
0.00%
0.00%
0.14%
9.09%
0.00%
0.00%
3.95%
0.00%
0.00%
0.00%
0.24%
0.26%
8.11%
0.00%
100.00%
0.28%

0.08%
0.00%
100.00%
0.00%
4.90%
100.00%

0.43%
0.00%
0.00%
0.12%
0.54%
4.13%
0.00%
100.00%
0.84%
0.00%
100.00%
0.46%
0.61%
2.32%

0.68%

0.54%
%sw
SAMPLES
>MRL
0.70%
7.48%
100.00%
0.00%
1.27%
0.00%
0.00%
0.00%
2.26%
0.00%
0.00%
0.56%
0.73%
1.43%
0.35%
0.00%
100.00%
0.00%

0.00%
0.00%
100.00%
0.00%
4.00%
100.00%

0.27%
0.00%
0.00%
0.18%
0.00%
2.47%
0.13%
100.00%
1.77%
0.00%
0.00%
0.00%
0.44%
0.00%

0.58%

0.53%
MIN VALUE
(M9/L)
< 0.00
< 0.50
1.70
< 0.05
< 0.00
< 0.02
< 0.50
< 0.50
< 0.00
< 0.50
< 0.00
< 0.20
< 0.10
< 0.10
< 0.50
< 0.50
0.90
< 0.10

< 2.00
< 0.20
0.40
< 0.50
< 0.10
0.20

< 0.00
< 0.00
< 0.20
< 0.02
< 0.20
< 0.15
< 0.03
1.60
< 0.10
< 1.00
1.00
< 0.50
< 0.20
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
4.80
5.50
< 2.00
< 2.00
1.70
< 0.50
< 2.00
5.00
< 0.50
< 0.30
< 1.00
< 2.00
< 4.00
7.00
< 0.50
8.10
< 1.00

< 2.00
< 2.00
5.10
< 1.00
2.00
44.60

< 4.12
< 1.00
< 0.20
< 1.00
< 2.00
0.15
< 0.50
12.00
< 10.00
< 1.00
1.00
< 0.50
< 4.00
1.40

< 4.00

< 4.00
MAX
VALUE
(M9/L)
550.00
40.70
5.50
< 10.00
11.00
1.70
< 0.50
< 2.00
34.00
< 0.50
< 0.30
36.00
100.00
17.00
269.00
< 0.50
8.10
9.00

5.40
< 2.00
5.10
< 1.00
44.00
44.60

16.77
< 5.00
< 0.20
2.80
30.00
0.15
4.40
12.00
7.00
< 1.00
1.00
11.00
120.00
2.50

550.00

550.00
MIN
DETECTS
(M9/L)
0.18
0.50
1.70

0.50
0.60


0.01


36.00
0.27
1.00
1.00

0.90
0.30

2.90

0.40

0.10
0.20

0.47


1.00
0.20
0.15
4.40
1.60
0.50

1.00
0.50
17.00
1.10

0.01

0.01
MEDIAN
DETECTS
(M9/L)
4.10
1.00
3.60

2.06
0.60


2.00


36.00
1.60
1.20
4.00

1.40
6.00

4.15

0.60

1.40
1.80

1.40


1.90
1.00
0.15
4.40
3.65
0.50

1.00
0.70
68.50
1.65

1.50

1.90
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (f
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                     Occurrence of Unregulated Contaminants in Public Water Systems
Table A.13.C URCIS (Round 1) Data- Chloromethane Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,625
351
2
2,931
12,342
36
63
333
341
2,461
1,220
1,212
5,999
1,941
2,311
22
5
1,908

2,654
322
42
1,621
647
41

3,165
1,595
148
2,168
15,954
444
1,221
8
1,307
10
1
3,987
390
313

71,141

67,940
TOTAL
UNIQUE
PWS
662
131
1
943
3,509
11
1
13
227
1,161
127
805
1,302
367
524
13
5
986

1,553
85
32
565
297
34

1,517
590
8
355
2,654
335
303
7
414
3
1
992
137
145

20,815

20,246
n GW PWS
534
93
0
873
3,473
9
0
11
46
1,052
112
766
1,187
329
291
9
4
940

1,529
71
32
523
254
33

1,492
555
7
252
2,492
306
156
6
394
0
1
937
63
116

18,948

18,513
3SWPWS
134
42
1
106
52
3
1
2
204
109
16
39
115
39
233
4
1
51

28
14
1
57
44
1

25
35
2
122
166
29
147
1
33
3
0
77
75
38

2,050

1,894
%PWS
>MRL
0.91%
10.69%
100.00%
0.00%
0.46%
18.18%
0.00%
0.00%
3.52%
0.00%
0.00%
0.12%
1.31%
1.63%
10.50%
0.00%
100.00%
0.41%

0.13%
0.00%
100.00%
0.00%
4.71%
100.00%

0.73%
0.00%
0.00%
0.85%
2.15%
3.58%
0.33%
100.00%
1.93%
0.00%
100.00%
1.11%
1.46%
2.07%

1.60%

1.22%
% GW PWS
>MRL
0.75%
6.45%
0.00%
0.00%
0.40%
22.22%
0.00%
0.00%
4.35%
0.00%
0.00%
0.00%
0.84%
0.91%
17.53%
0.00%
100.00%
0.43%

0.13%
0.00%
100.00%
0.00%
4.33%
100.00%

0.67%
0.00%
0.00%
0.79%
2.29%
3.27%
0.00%
100.00%
1.52%
0.00%
100.00%
1.17%
1.59%
2.59%

1.50%

1.11%
% SW PWS
>MRL
1.49%
19.05%
100.00%
0.00%
3.85%
0.00%
0.00%
0.00%
2.94%
0.00%
0.00%
2.56%
6.09%
7.69%
1.72%
0.00%
100.00%
0.00%

0.00%
0.00%
100.00%
0.00%
6.82%
100.00%

4.00%
0.00%
0.00%
0.82%
0.00%
6.90%
0.68%
100.00%
6.06%
0.00%
0.00%
0.00%
1.33%
0.00%

2.39%

2.27%
% PWS
> 1/2 MCL
0.76%
6.11%
100.00%
0.00%
0.23%
9.09%
0.00%
0.00%
2.20%
0.00%
0.00%
0.12%
0.77%
0.54%
9.54%
0.00%
40.00%
0.30%

0.13%
0.00%
3.13%
0.00%
2.36%
58.82%

0.26%
0.00%
0.00%
0.56%
1.02%
0.00%
0.33%
100.00%
0.24%
0.00%
0.00%
0.40%
1.46%
1.38%

0.85%

0.70%
% GW PWS
> 1/2 MCL
0.56%
2.15%
0.00%
0.00%
0.20%
11.11%
0.00%
0.00%
2.17%
0.00%
0.00%
0.00%
0.25%
0.61%
16.15%
0.00%
25.00%
0.32%

0.13%
0.00%
3.13%
0.00%
2.36%
57.58%

0.27%
0.00%
0.00%
0.40%
1.08%
0.00%
0.00%
100.00%
0.25%
0.00%
0.00%
0.43%
1.59%
1.72%

0.76%

0.62%
% SW PWS
> 1/2 MCL
1.49%
14.29%
100.00%
0.00%
1.92%
0.00%
0.00%
0.00%
1.96%
0.00%
0.00%
2.56%
6.09%
0.00%
1.29%
0.00%
100.00%
0.00%

0.00%
0.00%
0.00%
0.00%
2.27%
100.00%

0.00%
0.00%
0.00%
0.82%
0.00%
0.00%
0.68%
100.00%
0.00%
0.00%
0.00%
0.00%
1.33%
0.00%

1.56%

1.43%
%PWS
>MCL
0.60%
3.82%
100.00%
0.00%
0.17%
0.00%
0.00%
0.00%
1.76%
0.00%
0.00%
0.12%
0.38%
0.27%
6.49%
0.00%
40.00%
0.20%

0.06%
0.00%
3.13%
0.00%
0.67%
35.29%

0.13%
0.00%
0.00%
0.00%
0.72%
0.00%
0.33%
71.43%
0.24%
0.00%
0.00%
0.20%
1.46%
0.00%

0.54%

0.45%
% GW PWS
>MCL
0.37%
2.15%
0.00%
0.00%
0.17%
0.00%
0.00%
0.00%
2.17%
0.00%
0.00%
0.00%
0.08%
0.30%
11.34%
0.00%
25.00%
0.21%

0.07%
0.00%
3.13%
0.00%
0.79%
33.33%

0.13%
0.00%
0.00%
0.00%
0.76%
0.00%
0.00%
66.67%
0.25%
0.00%
0.00%
0.21%
1.59%
0.00%

0.49%

0.41%
% SW PWS
>MCL
1.49%
7.14%
100.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1.47%
0.00%
0.00%
2.56%
3.48%
0.00%
0.43%
0.00%
100.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
100.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.68%
100.00%
0.00%
0.00%
0.00%
0.00%
1.33%
0.00%

0.98%

0.84%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL violation. An MCL
violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Chloromethane is 3 pg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A. 14.a URCIS (Round 1) Data- cis-1,2-Dichloroethene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
660
132

928
296
11
1
13
208
1,162
127
1,002
1,299
366
524
13
15
842
18
1,565
85
3
565
297
6
4
1,512
590
8
355
2,641

303

412
3
3
992
137
145

17,243

16,705
# GW
PWS
531
94

862
265
8

11
45
1,053
112
963
1,185
328
291
9
15
795
17
1,540
71
3
523
254
6
4
1,487
555
7
252
2,479

156

392

3
937
63
116

15,432

15,026
# SW PWS
134
42

101
45
4
1
2
183
109
16
39
114
39
233
4
4
50
1
29
14

57
44


25
35
2
122
166

147

34
3

77
75
38

1,489

1,832
% PWS
>MRL
0.45%
5.30%

0.11%
14.19%
18.18%
0.00%
15.38%
9.13%
0.26%
1 .57%
0.40%
2.16%
3.28%
0.57%
7.69%
100.00%
0.36%
100.00%
0.77%
0.00%
100.00%
0.35%
2.69%
100.00%
100.00%
2.51 %
0.00%
0.00%
2.25%
1 .70%

0.66%

0.97%
0.00%
100.00%
0.50%
0.73%
0.69%

1 .78%

1 .47%
%GW
PWS
>MRL
0.38%
4.26%

0.12%
15.09%
12.50%
0.00%
9.09%
26.67%
0.28%
0.89%
0.31 %
2.11%
3.05%
0.34%
11.11%
100.00%
0.38%
100.00%
0.78%
0.00%
100.00%
0.38%
2.76%
100.00%
100.00%
2.42%
0.00%
0.00%
2.78%
1 .82%

0.64%

0.77%
0.00%
100.00%
0.53%
1 .59%
0.86%

1 .79%

1 .45%
%sw
PWS
>MRL
0.75%
7.14%

0.00%
4.44%
25.00%
0.00%
50.00%
4.37%
0.00%
6.25%
2.56%
2.63%
5.13%
0.86%
0.00%
100.00%
0.00%
100.00%
0.00%
0.00%
0.00%
0.00%
2.27%
0.00%
0.00%
8.00%
0.00%
0.00%
0.81 %
0.00%

0.68%

2.94%
0.00%
0.00%
0.00%
0.00%
0.00%

1 .81 %

1 .53%
% PWS
>MCL
0.00%
0.00%

0.00%
0.34%
0.00%
0.00%
0.00%
0.48%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
11.11%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.07%
0.00%
0.00%
0.28%
0.08%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.05%

0.03%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.38%
0.00%
0.00%
0.00%
2.22%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1 1 .76%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.07%
0.00%
0.00%
0.40%
0.08%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.05%

0.03%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
99% VALUE
(M9/L)
< 0.00
2.00

< 5.00
5.80
9.60
< 0.50
< 0.50
25.00
< 0.50
< 0.30
1.50
2.90
9.51
< 1.00
34.90
16.00
< 0.50
138.00
< 0.20
< 2.00
15.80
< 1.00
1.20
4.00
12.00
1.90
< 1.00
< 0.20
2.00
2.23

< 0.50

< 5.00
< 1.00
9.00
< 0.50
11.00
< 1.00

3.20

2.18
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation.  An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for cis-1,2-Dichloroethene is 70 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.14.b URCIS (Round 1)Data- cis-1,2-Dichloroethene Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
660
132

928
296
11
1
13
208
1,162
127
1,002
1,299
366
524
13
15
842
18
1,565
85
3
565
297
6
4
1,512
590
8
355
2,641

303

412
3
3
992
137
145

17,243

16,705
TOTAL #
SAMPLES
1,600
353

2,874
2,808
88
62
333
303
2,462
1,221
1,445
5,277
1,476
2,077
22
41
1,633
383
2,751
321
43
1,624
646
31
4
3,165
1,595
148
2,167
15,995

1,221

1,271
10
96
3,987
390
313

61,236

56,487
#GW
SAMPLES
1,314
246

2,232
2,690
84
0
189
85
1,864
1,081
1,730
4,273
1,535
1,114
18
36
1,247
333
2,672
295
43
1,376
571
31
4
2,799
1,475
136
1,616
15,078

434

1,161
0
96
3,656
164
259

51 ,442

49,056
#SW
SAMPLES
286
107

642
118
4
62
144
218
598
140
215
1,004
441
958
4
5
386
50
79
26
0
248
75
0
0
366
120
12
551
917

787

110
10
0
331
226
54

9,294

8,426
% TOTAL
SAMPLES
>MRL
0.19%
3.97%

0.07%
26.25%
62.50%
0.00%
0.90%
15.51%
0.20%
0.16%
1 .73%
2.71%
7.66%
0.14%
9.09%
1 .73%
0.31%
100.00%
0.65%
0.00%
100.00%
0.37%
2.48%
100.00%
100.00%
3.35%
0.00%
0.00%
2.35%
2.08%

0.16%

0.63%
0.00%
93.75%
0.83%
1 .28%
0.32%

3.80%

2.88%
%GW
SAMPLES
>MRL
0.15%
4.07%

0.09%
27.21%
64.29%
0.00%
1 .06%
45.88%
0.27%
0.09%
1 .39%
3.16%
5.67%
0.09%
11.11%
1 .39%
0.40%
100.00%
0.67%
0.00%
100.00%
0.44%
2.45%
100.00%
100.00%
3.64%
0.00%
0.00%
3.09%
2.21%

0.23%

0.60%
0.00%
93.75%
0.90%
3.05%
0.39%

4.29%

3.19%
%SW
SAMPLES
>MRL
0.35%
3.74%

0.00%
4.24%
25.00%
0.00%
0.69%
3.67%
0.00%
0.71%
0.47%
0.80%
5.90%
0.21%
0.00%
0.47%
0.00%
100.00%
0.00%
0.00%
0.00%
0.00%
2.67%
0.00%
0.00%
1 .09%
0.00%
0.00%
0.18%
0.00%

0.13%

0.91%
0.00%
0.00%
0.00%
0.00%
0.00%

1 .31 %

0.76%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.10
< 0.00
< 0.00
< 0.50
< 0.00
< 0.00
< 0.50
< 0.00
< 0.10
< 0.04
< 0.01
< 0.50
< 0.50
0.11
< 0.20
1.00
< 0.20
< 0.20
0.50
< 0.50
< 0.03
0.20
0.61
< 0.00
< 0.00
< 0.20
< 0.10
< 0.00

< 0.01

< 0.00
< 1.00
0.00
< 0.50
< 0.05
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
2.00

< 5.00
5.80
9.60
< 0.50
< 0.50
25.00
< 0.50
< 0.30
1.50
2.90
9.51
< 1.00
34.90
16.00
< 0.50
138.00
< 0.20
< 2.00
15.80
< 1.00
1.20
4.00
12.00
1.90
< 1.00
< 0.20
2.00
2.23

< 0.50

< 5.00
< 1.00
9.00
< 0.50
11.00
< 1.00

3.20

2.18
MAX
VALUE
(M9/L)
1.00
21.80

5.00
179.00
9.60
< 0.50
14.10
78.40
8.20
1.30
11.00
28.00
59.90
11.00
34.90
16.00
8.80
229.00
34.00
< 2.00
15.80
15.80
7.22
4.00
12.00
82.00
< 5.00
< 0.20
181.00
213.00

7.50

1.00
< 1.00
9.00
1.80
21.00
0.50

229.00

213.00
MIN
DETECTS
(M9/L)
0.80
0.60

1.00
0.10
1.00

0.20
0.01
0.80
0.80
0.50
0.04
0.01
1.00
2.30
0.11
0.80
1.00
0.20

0.50
8.00
0.03
0.20
0.61
0.18


0.50
0.30

0.60

0.10

0.70
0.50
4.50
0.50

0.01

0.01
MEDIAN
DETECTS
(M9/L)
0.90
1.00

3.00
1.60
2.00

0.30
1.56
3.80
1.05
1.90
2.00
2.26
7.70
18.60
1.00
1.00
3.00
0.40

1.40
10.85
0.87
0.80
1.30
1.10


2.00
2.10

4.05

0.10

4.00
0.60
12.00
0.50

1.90

1.60
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                               Occurrence of Unregulated Contaminants in Public Water Systems
Table A.14.C URCIS (Round 1) Data-  cis-1,2-Dichloroethene Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,600
353

2,874
2,808
88
62
333
303
2,462
1,221
1,445
5,277
1,476
2,077
22
41
1,633
383
2,751
321
43
1,624
646
31
4
3,165
1,595
148
2,167
15,995

1,221

1,271
10
96
3,987
390
313

61,236

56,487
TOTAL
UNIQUE
PWS
660
132

928
296
11
1
13
208
1,162
127
1,002
1,299
366
524
13
15
842
18
1,565
85
3
565
297
6
4
1,512
590
8
355
2,641

303

412
3
3
992
137
145

17,243

16,705
#GW
PWS
531
94

862
265
8
0
11
45
1,053
112
963
1,185
328
291
9
15
795
17
1,540
71
3
523
254
6
4
1,487
555
7
252
2,479

156

392
0
3
937
63
116

15,432

15,026
# SW PWS
134
42

101
45
4
1
2
183
109
16
39
114
39
233
4
4
50
1
29
14
0
57
44
0
0
25
35
2
122
166

147

34
3
0
77
75
38

1,489

1,832
% PWS
>MRL
0.45%
5.30%

0.11%
14.19%
18.18%
0.00%
15.38%
6.73%
0.26%
1 .57%
0.40%
2.16%
3.28%
0.57%
7.69%
0.40%
0.36%
100.00%
0.77%
0.00%
100.00%
0.35%
2.69%
100.00%
100.00%
2.51%
0.00%
0.00%
2.25%
1 .70%

0.66%

0.97%
0.00%
100.00%
0.50%
0.73%
0.69%

1 .78%

1 .44%
%GW
PWS
>MRL
0.38%
4.26%

0.12%
15.09%
12.50%
0.00%
9.09%
26.67%
0.28%
0.89%
0.31%
2.11%
3.05%
0.34%
11.11%
0.31%
0.38%
100.00%
0.78%
0.00%
100.00%
0.38%
2.76%
100.00%
100.00%
2.42%
0.00%
0.00%
2.78%
1 .82%

0.64%

0.77%
0.00%
100.00%
0.53%
1 .59%
0.86%

1 .79%

1 .45%
%sw
PWS
>MRL
0.75%
7.14%

0.00%
4.44%
25.00%
0.00%
50.00%
4.37%
0.00%
6.25%
2.56%
2.63%
5.13%
0.86%
0.00%
2.56%
0.00%
100.00%
0.00%
0.00%
0.00%
0.00%
2.27%
0.00%
0.00%
8.00%
0.00%
0.00%
0.82%
0.00%

0.68%

2.94%
0.00%
0.00%
0.00%
0.00%
0.00%

2.42%

1 .53%
% PWS
> 1/2 MCL
0.00%
0.00%

0.00%
1 .35%
0.00%
0.00%
0.00%
0.96%
0.00%
0.00%
0.00%
0.00%
0.82%
0.00%
0.00%
0.00%
0.00%
27.78%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.07%
0.00%
0.00%
0.28%
0.11%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.08%

0.08%
%GW
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
1.13%
0.00%
0.00%
0.00%
4.44%
0.00%
0.00%
0.00%
0.00%
0.61%
0.00%
0.00%
0.00%
0.00%
29.41%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.07%
0.00%
0.00%
0.40%
0.12%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.11%

0.07%
%sw
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
2.22%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.56%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.13%

0.11%
% PWS
>MCL
0.00%
0.00%

0.00%
0.34%
0.00%
0.00%
0.00%
0.48%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
11.11%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.07%
0.00%
0.00%
0.28%
0.08%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.05%

0.03%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.38%
0.00%
0.00%
0.00%
2.22%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1 1 .76%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.07%
0.00%
0.00%
0.40%
0.08%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.05%

0.03%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
"% > MCL" indicates the systems of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the  primacy
The Maximum Contaminant Level (MCL) for cis-1,2-Dichloroethene is 70 [ig/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A. 15.a URCIS (Round 1) Data-  cis-1,2-Dichloropropene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS



440
3,482
5
1
9
210

127
984

236
524


124

1,563

1

297





341







992
87
145

9,568

9,211
# GW
PWS



400
3,465
3

7
36

112
945

216
291


82

1,538

1

254





247







937
46
116

8,696

8,438
# SW PWS



46
17
3
1
2
191

16
39

21
233


44

29



44





110







77
41
38

952

836
% PWS
>MRL



0.45%
0.26%
20.00%
0.00%
11.11%
4.76%

0.00%
0.00%

0.00%
0.00%


0.00%

2.24%

100.00%

0.00%





0.00%







0.00%
0.00%
0.00%

0.62%

0.61 %
%GW
PWS
>MRL



0.50%
0.26%
0.00%
0.00%
0.00%
2.78%

0.00%
0.00%

0.00%
0.00%


0.00%

2.08%

100.00%

0.00%





0.00%







0.00%
0.00%
0.00%

0.52%

0.52%
%sw
PWS
>MRL



0.00%
0.00%
33.33%
0.00%
50.00%
4.71 %

0.00%
0.00%

0.00%
0.00%


0.00%

10.34%

0.00%

0.00%





0.00%







0.00%
0.00%
0.00%

1 .47%

1 .44%
% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level
(HRL), Maximum Contaminant
Level (MCL), or Health Advisory
Level (HAL) for
cis-1 ,2-Dichloropropene.




























































99% VALUE
(M9/L)



< 1.00
< 0.50
0.10
< 0.50
1.20
1.00

< 0.30
< 1.00

< 2.00
< 1.00


< 1.00

0.30

0.60

< 0.50





< 1.00







< 0.50
< 4.00
< 0.60

< 1.00

< 1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.15.b URCIS (Round 1) Data- cis-1,2-Dichloropropene Occurrence in Public Water Systems - Based on Number of Sample
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS



440
3,482
5
1
9
210

127
984

236
524


124

1,563

1

297





341







992
87
145

9,568

9,211
TOTAL #
SAMPLES



1,118
10,615
18
62
50
283

1,221
1,817

1,107
2,076


327

2,751

1

644





1,781







3,987
185
313

28,356

26,444
#GW
SAMPLES



945
10,580
15
0
41
55

1,081
1,633

897
1,119


166

2,673

1

569





1,399







3,656
103
259

25,192

23,736
#SW
SAMPLES



173
35
3
62
9
228

140
184

210
957


161

78

0

75





382







331
82
54

3,164

2,708
% TOTAL
SAMPLES
>MRL



0.18%
0.16%
5.56%
0.00%
2.00%
3.89%

0.00%
0.00%

0.00%
0.00%


0.00%

1 .53%

100.00%

0.00%





0.00%







0.00%
0.00%
0.00%

0.26%

0.27%
%GW
SAMPLES
>MRL



0.21%
0.16%
0.00%
0.00%
0.00%
3.64%

0.00%
0.00%

0.00%
0.00%


0.00%

1 .46%

100.00%

0.00%





0.00%







0.00%
0.00%
0.00%

0.24%

0.25%
%SW
SAMPLES
>MRL



0.00%
0.00%
33.33%
0.00%
11.11%
3.95%

0.00%
0.00%

0.00%
0.00%


0.00%

3.85%

0.00%

0.00%





0.00%







0.00%
0.00%
0.00%

0.44%

0.44%
MIN VALUE
(M9/L)



< 0.05
< 0.00
< 0.10
< 0.50
< 0.70
< 0.00

< 0.00
< 0.50

< 0.08
< 0.50


< 0.10

< 0.20

0.60

< 0.50





< 0.10







< 0.50
< 0.10
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)



< 1.00
< 0.50
0.10
< 0.50
1.20
1.00

< 0.30
< 1.00

< 2.00
< 1.00


< 1.00

0.30

0.60

< 0.50





< 1.00







< 0.50
< 4.00
< 0.60

< 1.00

< 1.00
MAX
VALUE
(M9/L)



2.00
31.00
0.10
< 0.50
1.20
9.00

< 0.30
< 1.00

< 5.00
< 1.00


< 1.00

1.80

0.60

< 0.50





< 5.00







< 0.50
< 4.00
< 1.00

31.00

31.00
MIN
DETECTS
(M9/L)



0.60
0.50
0.10

1.20
0.01










0.20

0.60



















0.01

0.01
MEDIAN
DETECTS
(M9/L)



1.30
0.50
0.10

1.20
1.00










0.40

0.60



















0.50

0.50
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.15.c URCIS (Round 1) Data- cis-1,2-Dichloropropene Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES



1,118
10,615
18
62
50
283

1,221
1,817

1,107
2,076


327

2,751

1

644





1,781







3,987
185
313

28,356

26,444
TOTAL
UNIQUE
PWS



440
3,482
5
1
9
210

127
984

236
524


124

1,563

1

297





341







992
87
145

9,568

9,211
#GW
PWS



400
3,465
3
0
7
36

112
945

216
291


82

1,538

1

254





247







937
46
116

8,696

8,438
#SW
PWS



46
17
3
1
2
191

16
39

21
233


44

29

0

44





110







77
41
38

952

836
% PWS
>MRL



0.45%
0.26%
20.00%
0.00%
11.11%
4.76%

0.00%
0.00%

0.00%
0.00%


0.00%

2.24%

100.00%

0.00%





0.00%







0.00%
0.00%
0.00%

0.62%

0.61%
%GW
PWS
>MRL



0.50%
0.26%
0.00%
0.00%
0.00%
2.78%

0.00%
0.00%

0.00%
0.00%


0.00%

2.08%

100.00%

0.00%





0.00%







0.00%
0.00%
0.00%

0.52%

0.52%
%sw
PWS
>MRL



0.00%
0.00%
33.33%
0.00%
50.00%
4.71%

0.00%
0.00%

0.00%
0.00%


0.00%

10.34%

0.00%

0.00%





0.00%







0.00%
0.00%
0.00%

1.47%

1.44%
% PWS
> 1/2 MCL

















%GW
PWS
> 1/2 MCL

















%SW
PWS
> 1/2 MCL

















% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level (HRL), Maximum
Contaminant Level (MCL), or Health Advisory Level (HAL) for
cis-1 ,2-Dichloropropene.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                               Occurrence of Unregulated Contaminants in Public Water Systems
Table A.16.a URCIS (Round 1) Data- Dibromochloromethane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE PWS
687
141

940
3,573
9
1
13
528
1,163
127
1,002
1,303
383
524
13
50
986
3
1,558
85
61
565
297
34
34
1,517
590
10
235
1,687
335
303

417
3
29
992
132
145

20,475

19,895
# GW PWS
549
98

870
3,528
7
0
11
84
1,054
112
963
1,188
339
291
9
17
940
1
1,533
71
61
523
254
30
17
1,492
555
8
166
1,557
306
156

398
0
22
937
58
116

18,321

17,901
# SW PWS
144
49

108
84
3
1
2
480
109
16
39
115
45
233
4
38
51
2
29
14
3
57
44
4
18
25
35
3
79
134
29
147

33
3
7
77
75
38

2,377

2,196
% PWS
>MRL
9.32%
31.91%

6.70%
5.74%
44.44%
100.00%
61.54%
58.33%
28.80%
17.32%
29.34%
34.23%
26.11%
63.55%
23.08%
94.00%
9.94%
100.00%
9.24%
22.35%
100.00%
11.86%
6.40%
100.00%
100.00%
6.39%
2.88%
40.00%
22.98%
23.71%
28.66%
47.52%

10.07%
66.67%
68.97%
17.14%
35.61%
33.79%

19.04%

17.87%
% GW PWS
>MRL
3.28%
13.27%

3.10%
4.73%
57.14%
0.00%
54.55%
48.81%
22.49%
13.39%
27.00%
28.37%
17.11%
48.80%
0.00%
94.12%
7.02%
100.00%
8.28%
12.68%
100.00%
6.69%
4.72%
100.00%
100.00%
5.03%
1.62%
25.00%
14.46%
18.18%
22.55%
17.95%

6.28%
0.00%
59.09%
15.90%
24.14%
27.59%

13.22%

12.33%
% SW PWS
>MRL
32.64%
67.35%

34.26%
64.29%
33.33%
100.00%
100.00%
58.75%
89.91%
43.75%
87.18%
94.78%
93.33%
81.97%
75.00%
94.74%
64.71%
100.00%
65.52%
71.43%
100.00%
57.89%
15.91%
100.00%
100.00%
88.00%
22.86%
66.67%
37.97%
88.81%
93.10%
78.91%

54.55%
66.67%
100.00%
31.17%
44.00%
55.26%

64.58%

63.43%
% PWS
>HRL
0.29%
0.00%

0.00%
0.08%
0.00%
0.00%
0.00%
0.38%
0.00%
0.00%
0.00%
0.00%
0.00%
0.57%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.34%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.05%

0.06%
% GW PWS
>HRL
0.00%
0.00%

0.00%
0.09%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.39%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.02%

0.02%
% SW PWS
>HRL
1.39%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.42%
0.00%
0.00%
0.00%
0.00%
0.00%
1.29%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.29%

0.32%
99% VALUE
(M9/L)
24.00
9.00

19.00
14.00
9.80
5.60
14.00
41.00
5.20
3.40
11.00
11.00
16.10
34.00
5.04
8.00
3.00
2.00
3.60
6.00
15.50
5.70
23.90
24.00
7.00
3.94
2.50
9.00
9.80
7.90
13.70
15.70

4.50
19.00
7.00
6.50
23.00
11.00

12.20

12.70
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for
laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Dibromochloromethane is 60 ug/L. This is a draft value for working review only.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                         Occurrence of Unregulated Contaminants in Public Water Systems
Table A.16.b URCIS (Round 1) Data- Dibromochloromethane Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE PWS
687
141

940
3,573
9
1
13
528
1,163
127
1,002
1,303
383
524
13
50
986
3
1,558
85
61
565
297
34
34
1,517
590
10
235
1,687
335
303

417
3
29
992
132
145

20,475

19,895
TOTAL #
SAMPLES
1,696
410

3,150
12,844
33
65
385
705
2,465
1,221
2,288
6,010
2,502
2,312
22
153
1,909
4
2,734
326
111
1,624
644
73
76
3,153
1,595
157
1,408
6,369
444
1,221

1,316
10
79
3,987
655
313

64,469

61,567
#GW
SAMPLES
1,364
258

2,399
12,284
30
0
227
113
1,866
1,081
1,863
5,045
1,562
1,172
18
62
1,441
1
2,660
294
98
1,376
569
57
32
2,795
1,475
139
965
5,754
363
434

1,204
0
24
3,656
196
259

53,136

51,189
#SW
SAMPLES
332
152

751
560
3
65
158
592
599
140
425
965
940
1,140
4
91
468
3
74
32
13
248
75
16
44
358
120
18
443
615
81
787

112
10
55
331
459
54

11,333

10,378
% TOTAL
SAMPLES
>MRL
7.31%
22.44%

8.92%
6.47%
30.30%
87.69%
56.10%
54.33%
28.92%
4.34%
28.37%
27.80%
37.61%
45.11%
13.64%
91.50%
11.47%
100.00%
7.39%
10.43%
100.00%
9.61%
3.42%
100.00%
100.00%
7.48%
3.51%
19.75%
13.07%
13.60%
34.68%
38.17%

6.08%
50.00%
64.56%
13.67%
33.28%
26.84%

17.19%

16.38%
%GW
SAMPLES
>MRL
2.13%
6.20%

4.63%
4.31%
30.00%
0.00%
34.80%
43.36%
18.27%
2.31%
21.04%
19.68%
14.66%
30.55%
0.00%
87.10%
6.80%
100.00%
6.32%
4.08%
100.00%
4.07%
2.28%
100.00%
100.00%
4.11%
2.64%
17.99%
5.18%
8.78%
21.76%
37.33%

2.91%
0.00%
58.33%
13.46%
24.49%
19.69%

10.09%

9.64%
%SW
SAMPLES
>MRL
28.61%
50.00%

22.64%
53.93%
33.33%
87.69%
86.71%
56.42%
62.10%
20.00%
60.47%
70.26%
75.74%
60.09%
75.00%
94.51%
25.85%
100.00%
45.95%
68.75%
100.00%
40.32%
12.00%
100.00%
100.00%
33.80%
14.17%
33.33%
30.25%
58.70%
92.59%
38.63%

40.18%
50.00%
67.27%
16.01%
37.04%
61.11%

50.44%

49.64%
MIN VALUE
(M9/L)
< 0.00
< 0.28

< 0.05
< 0.00
< 0.05
< 0.00
< 0.10
< 0.00
< 0.50
< 0.00
< 0.00
< 0.05
< 0.08
< 0.50
< 0.50
< 0.00
< 0.10
1.00
< 0.20
< 0.50
0.50
< 0.00
< 0.50
0.30
0.32
< 0.00
< 0.00
< 0.20
< 0.05
< 0.00
< 0.15
< 0.03

< 0.10
< 1.00
< 0.00
< 0.50
< 0.50
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
24.00
9.00

19.00
14.00
9.80
5.60
14.00
41.00
5.20
3.40
11.00
11.00
16.10
34.00
5.04
8.00
3.00
2.00
3.60
6.00
15.50
5.70
23.90
24.00
7.00
3.94
2.50
9.00
9.80
7.90
13.70
15.70

4.50
19.00
7.00
6.50
23.00
11.00

12.20

12.70
MAX VALUE
(M9/L)
234.00
52.20

44.00
89.00
9.80
5.60
20.00
117.00
21.60
14.20
48.00
53.00
34.00
95.00
5.04
43.00
49.00
2.00
17.00
10.00
16.40
13.10
79.00
24.00
7.00
25.70
7.00
10.00
41.00
44.80
55.40
49.00

12.00
19.00
7.00
21.90
31.00
15.00

234.00

234.00
MIN
DETECTS
(M9/L)
0.24
0.28

0.05
0.01
0.35
1.00
0.10
0.01
0.50
1.00
0.40
0.20
0.08
0.50
0.60
0.10
0.10
1.00
0.20
0.70
0.50
0.50
0.60
0.30
0.32
0.16
0.40
0.20
0.40
0.20
0.15
0.13

0.20
4.20
0.50
0.50
0.50
0.20

0.01

0.01
MEDIAN
DETECTS
(M9/L)
3.00
1.50

8.00
2.40
1.23
2.20
1.60
2.60
1.20
2.20
3.00
2.10
2.00
3.00
2.40
1.65
0.60
1.00
1.10
2.75
1.30
1.55
5.90
2.90
1.02
1.50
1.65
0.80
1.90
2.27
2.12
1.10

1.90
9.70
1.00
1.40
3.00
2.15

2.00

2.00
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                                 Occurrence of Unregulated Contaminants in Public Water Systems
Table A.16.C  URCIS (Round 1) Data- Dibromochloromethane Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL #
SAMPLES
1,696
410

3,150
12,844
33
65
385
705
2,465
1,221
2,288
6,010
2,502
2,312
22
153
1,909
4
2,734
326
111
1,624
644
73
76
3,153
1,595
157
1,408
6,369
444
1,221

1,316
10
79
3,987
655
313

64,469

61,567
TOTAL
UNIQUE PWS
687
141

940
3,573
9
1
13
528
1,163
127
1,002
1,303
383
524
13
50
986
3
1,558
85
61
565
297
34
34
1,517
590
10
235
1,687
335
303

417
3
29
992
132
145

20,475

19,895
3GWPWS
549
98

870
3,528
7
0
11
84
1,054
112
963
1,188
339
291
9
17
940
1
1,533
71
61
523
254
30
17
1,492
555
8
166
1,557
306
156

398
0
22
937
58
116

18,321

17,901
3SWPWS
144
49

108
84
3
1
2
480
109
16
39
115
45
233
4
38
51
2
29
14
3
57
44
4
18
25
35
3
79
134
29
147

33
3
7
77
75
38

2,377

2,196
%PWS
>MRL
9.32%
31.91%

6.70%
5.74%
44.44%
100.00%
61.54%
58.33%
28.80%
17.32%
29.34%
34.23%
26.11%
63.55%
23.08%
94.00%
9.94%
100.00%
9.24%
22.35%
100.00%
1 1 .86%
6.40%
100.00%
100.00%
6.39%
2.88%
40.00%
22.98%
23.71%
28.66%
47.52%

10.07%
66.67%
68.97%
17.14%
35.61%
33.79%

19.04%

17.87%
% GW PWS
>MRL
3.28%
13.27%

3.10%
4.73%
57.14%
0.00%
54.55%
48.81%
22.49%
13.39%
27.00%
28.37%
17.11%
48.80%
0.00%
94.12%
7.02%
100.00%
8.28%
12.68%
100.00%
6.69%
4.72%
100.00%
100.00%
5.03%
1.62%
25.00%
14.46%
18.18%
22.55%
17.95%

6.28%
0.00%
59.09%
15.90%
24.14%
27.59%

13.22%

12.33%
% SW PWS
>MRL
32.64%
67.35%

34.26%
64.29%
33.33%
100.00%
100.00%
58.75%
89.91%
43.75%
87.18%
94.78%
93.33%
81.97%
75.00%
94.74%
64.71%
100.00%
65.52%
71.43%
100.00%
57.89%
15.91%
100.00%
100.00%
88.00%
22.86%
66.67%
37.97%
88.81%
93.10%
78.91%

54.55%
66.67%
100.00%
31.17%
44.00%
55.26%

64.58%

63.43%
% PWS
> 1/2 HRL
1.46%
0.71%

0.43%
0.59%
0.00%
0.00%
0.00%
1.89%
0.00%
0.00%
0.30%
0.31%
0.26%
3.24%
0.00%
2.00%
0.10%
0.00%
0.00%
0.00%
0.00%
0.00%
1.35%
0.00%
0.00%
0.00%
0.00%
0.00%
0.43%
0.30%
0.30%
0.66%

0.00%
0.00%
0.00%
0.00%
0.76%
0.00%

0.42%

0.43%
% GW PWS
> 1/2 HRL
0.00%
0.00%

0.11%
0.28%
0.00%
0.00%
0.00%
2.38%
0.00%
0.00%
0.31%
0.17%
0.00%
0.34%
0.00%
0.00%
0.11%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .57%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.13%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.14%

0.15%
% SW PWS
> 1/2 HRL
6.94%
2.04%

2.78%
14.29%
0.00%
0.00%
0.00%
1.88%
0.00%
0.00%
0.00%
1.74%
2.22%
6.87%
0.00%
2.63%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1.27%
2.24%
3.45%
1.36%

0.00%
0.00%
0.00%
0.00%
1.33%
0.00%

2.65%

2.78%
%PWS
>HRL
0.29%
0.00%

0.00%
0.08%
0.00%
0.00%
0.00%
0.38%
0.00%
0.00%
0.00%
0.00%
0.00%
0.57%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.34%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.05%

0.06%
% GW PWS
>HRL
0.00%
0.00%

0.00%
0.09%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.39%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.02%

0.02%
% SW PWS
>HRL
1 .39%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.42%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .29%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.29%

0.32%
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Dibromochloromethane is 60 Mg/L. This is a draft value for working review only.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
           Occurrence of Unregulated Contaminants in Public Water Systems
Table A. 17. a URCIS (Round 1) Data- Dibromomethane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATE
TOTAL
UNIQUE
PWS
660
131

940
151
9
1
13
117
1,162
127
1,002
1,302
364
524
13
3
984

1,565
85
3
565
297
1
1
1,504
590
8
354
2,654
335
303


3
1
992
135
145

17,044

16,549
# GW
PWS
531
93

871
135
7
0
11
34
1,053
112
963
1,187
326
291
9
2
937

1,540
71
3
523
254
1
1
1,479
555
7
251
2,492
306
156


0
1
937
62
116

15,317

14,953
#SW
PWS
134
42

105
22
3
1
2
95
109
16
39
115
39
233
4
1
50

29
14
0
57
44
0
0
25
35
2
122
166
29
147


3
0
77
74
38

1,872

1,720
% PWS
>MRL
0.45%
4.58%

0.00%
1 .99%
11.11%
0.00%
7.69%
3.42%
0.00%
0.79%
0.00%
1 .00%
0.27%
0.95%
0.00%
100.00%
0.20%

0.06%
0.00%
100.00%
0.18%
3.03%
100.00%
100.00%
0.33%
0.17%
12.50%
0.56%
0.15%
0.00%
0.00%


0.00%
100.00%
0.00%
0.00%
0.69%

0.43%

0.36%
%GW
PWS
>MRL
0.00%
2.15%

0.00%
1 .48%
0.00%
0.00%
0.00%
2.94%
0.00%
0.00%
0.00%
0.42%
0.31%
1 .37%
0.00%
100.00%
0.00%

0.06%
0.00%
100.00%
0.00%
1 .97%
100.00%
100.00%
0.34%
0.18%
14.29%
0.00%
0.12%
0.00%
0.00%


0.00%
100.00%
0.00%
0.00%
0.86%

0.26%

0.21%
%sw
PWS
>MRL
2.24%
9.52%

0.00%
4.55%
33.33%
0.00%
50.00%
3.16%
0.00%
6.25%
0.00%
6.96%
0.00%
0.43%
0.00%
100.00%
4.00%

0.00%
0.00%
0.00%
1 .75%
9.09%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .64%
0.60%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%

1 .82%

1 .69%
% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference
Level (HRL), Maximum
Contaminant Level (MCL), or
Health Advisory Level (HAL) for
Dibromomethane.




























































99%
VALUE
(M9/L)
< 0.00
1.90

< 2.00
< 0.50
2.90
< 0.50
< 2.00
11.90
< 0.50
< 0.50
< 2.00
< 1.00
< 2.00
< 1.00
< 0.50
5.45
< 1.00

< 1.00
< 2.00
0.70
< 1.00
2.20
0.40
0.63
< 2.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 2.20


< 1.00
0.60
< 0.50
< 4.00
< 1.40

< 2.00

< 2.00
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source
Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                          Occurrence of Unregulated Contaminants in Public Water Systems
Table A.17.b  URCIS (Round 1) Data- Dibromomethane Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
660
131

940
151
9
1
13
117
1,162
127
1,002
1,302
364
524
13
3
984

1,565
85
3
565
297
1
1
1,504
590
8
354
2,654
335
303


3
1
992
135
145

17,044

16,549
TOTAL #
SAMPLES
1,600
351

2,877
1,059
34
62
333
159
2,462
1,221
1,909
6,002
1,937
2,076
22
7
1,756

2,757
321
3
1,624
644
1
1
3,150
1,595
148
2,164
15,953
444
1,220


10
1
3,987
388
313

58,591

55,484
#GW
SAMPLES
1,314
244

2,236
1,003
30
0
189
52
1,863
1,081
1,697
5,035
1,512
1,119
18
6
1,382

2,678
295
3
1,376
569
1
1
2,784
1,475
136
1,615
15,036
363
433


0
1
3,656
162
259

49,624

47,329
#SW
SAMPLES
286
107

641
56
4
62
144
107
599
140
212
967
425
957
4
1
374

79
26
0
248
75
0
0
366
120
12
549
917
81
787


10
0
331
226
54

8,967

8,155
% TOTAL
SAMPLES
>MRL
0.19%
1.71%

0.00%
0.28%
5.88%
0.00%
0.30%
3.14%
0.00%
0.16%
0.00%
0.25%
0.10%
0.39%
0.00%
100.00%
0.80%

0.04%
0.00%
100.00%
0.06%
1 .55%
100.00%
100.00%
0.22%
0.06%
0.68%
0.09%
0.03%
0.00%
0.00%


0.00%
100.00%
0.00%
0.00%
0.32%

0.17%

0.15%
%GW
SAMPLES
>MRL
0.00%
0.82%

0.00%
0.20%
0.00%
0.00%
0.00%
3.85%
0.00%
0.00%
0.00%
0.14%
0.13%
0.63%
0.00%
100.00%
0.00%

0.04%
0.00%
100.00%
0.00%
0.88%
100.00%
100.00%
0.25%
0.07%
0.74%
0.00%
0.02%
0.00%
0.00%


0.00%
100.00%
0.00%
0.00%
0.39%

0.11%

0.08%
%SW
SAMPLES
>MRL
1 .05%
3.74%

0.00%
1 .79%
50.00%
0.00%
0.69%
2.80%
0.00%
1 .43%
0.00%
0.83%
0.00%
0.10%
0.00%
100.00%
3.74%

0.00%
0.00%

0.40%
6.67%
0.00%
0.00%
0.00%
0.00%
0.00%
0.36%
0.11%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%

0.55%

0.53%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.10
< 0.00
< 0.06
< 0.50
< 0.00
< 0.00
< 0.50
< 0.00
< 0.40
< 0.10
< 0.02
< 0.50
< 0.50
0.50
< 0.10

< 0.10
< 0.20
0.50
< 0.50
< 0.50
0.40
0.63
< 0.00
< 0.00
< 0.20
< 0.10
< 0.00
< 0.50
< 0.10


< 1.00
0.60
< 0.50
< 0.20
< 0.10

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
1.90

< 2.00
< 0.50
2.90
< 0.50
< 2.00
11.90
< 0.50
< 0.50
< 2.00
< 1.00
< 2.00
< 1.00
< 0.50
5.45
< 1.00

< 1.00
< 2.00
0.70
< 1.00
2.20
0.40
0.63
< 2.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 2.20


< 1.00
0.60
< 0.50
< 4.00
< 1.40

< 2.00

< 2.00
MAX
VALUE
(M9/L)
2.80
5.90

< 10.00
3.50
2.90
< 0.50
65.90
21.10
< 0.50
2.30
< 2.00
13.00
0.10
11.00
< 0.50
5.45
1.30

0.80
< 2.00
0.70
3.23
19.00
0.40
0.63
11.60
0.40
0.50
2.00
7.00
< 0.50
< 2.20


< 1.00
0.60
< 0.50
< 5.00
1.00

65.90

21.10
MIN
DETECTS
(M9/L)
0.50
0.70


1.00
2.90

65.90
0.54

2.30

0.10
0.10
1.00

0.50
0.10

0.80

0.50
3.23
0.50
0.40
0.63
0.12
0.40
0.50
0.50
0.80





0.60


1.00

0.10

0.10
MEDIAN
DETECTS
(M9/L)
1.40
2.30


1.40
2.90

65.90
2.00

2.30

1.00
0.10
3.50

2.82
0.45

0.80

0.60
3.23
2.20
0.40
0.63
2.40
0.40
0.50
1.25
2.75





0.60


1.00

1.45

1.40
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                             Occurrence of Unregulated Contaminants in Public Water Systems
Table A.17.C  URCIS (Round 1) Data- Dibromomethane Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,600
351

2,877
1,059
34
62
333
159
2,462
1,221
1,909
6,002
1,937
2,076
22
7
1,756

2,757
321
3
1,624
644
1
1
3,150
1,595
148
2,164
15,953
444
1,220


10
1
3,987
388
313

58,591

55,484
TOTAL
UNIQUE
PWS
660
131

940
151
9
1
13
117
1,162
127
1,002
1,302
364
524
13
3
984

1,565
85
3
565
297
1
1
1,504
590
8
354
2,654
335
303


3
1
992
135
145

17,044

16,549
#GW
PWS
531
93

871
135
7
0
11
34
1,053
112
963
1,187
326
291
9
2
937

1,540
71
3
523
254
1
1
1,479
555
7
251
2,492
306
156


0
1
937
62
116

15,317

14,953
# SW PWS
134
42

105
22
3
1
2
95
109
16
39
115
39
233
4
1
50

29
14
0
57
44
0
0
25
35
2
122
166
29
147


3
0
77
74
38

1,872

1,720
% PWS
>MRL
0.45%
4.58%

0.00%
1 .99%
11.11%
0.00%
7.69%
3.42%
0.00%
0.79%
0.00%
1 .00%
0.27%
0.95%
0.00%
100.00%
0.20%

0.06%
0.00%
100.00%
0.18%
3.03%
100.00%
100.00%
0.33%
0.17%
12.50%
0.56%
0.15%
0.00%
0.00%


0.00%
100.00%
0.00%
0.00%
0.69%

0.43%

0.36%
%GW
PWS
>MRL
0.00%
2.15%

0.00%
1 .48%
0.00%
0.00%
0.00%
2.94%
0.00%
0.00%
0.00%
0.42%
0.31 %
1.37%
0.00%
100.00%
0.00%

0.06%
0.00%
100.00%
0.00%
1 .97%
100.00%
100.00%
0.34%
0.18%
14.29%
0.00%
0.12%
0.00%
0.00%


0.00%
100.00%
0.00%
0.00%
0.86%

0.26%

0.21%
%SW
PWS
>MRL
2.24%
9.52%

0.00%
4.55%
33.33%
0.00%
50.00%
3.16%
0.00%
6.25%
0.00%
6.96%
0.00%
0.43%
0.00%
100.00%
4.00%

0.00%
0.00%
0.00%
1 .75%
9.09%
0.00%
0.00%
0.00%
0.00%
0.00%
1.64%
0.60%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%

1 .82%

1 .69%
% PWS
> 1/2 MCL

















%GW
PWS
> 1/2 MCL

















%SW
PWS
> 1/2 MCL

















% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level (HRL), Maximum
Contaminant Level (MCL), or Health Advisory Level (HAL) for
Dibromomethane.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for labor;
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.18.a URCIS (Round 1) Data- Dichlorodifluoromethane Occurrence in Public Water Sy;
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATE
TOTAL
UNIQUE
PWS
650
131

943
3,485
7
1
10
193
462


213
356
524
13
6
986

1,549
85
2

297
6
1
804
590
8
355
2,647
335
303
1
410
3

992
61
145

16,574

16,076
# GW
PWS
526
93

873
3,458
4
0
8
38
384


149
320
291
9
6
940

1,525
71
2

254
6
0
793
555
7
252
2,485
306
156
0
390
0

937
28
116

14,982

14,617
#SW
PWS
129
42

106
36
4
1
2
170
78


64
37
233
4
0
51

28
14
1

44
0
1
11
35
2
122
166
29
147
1
34
3

77
33
38

1,743

1,588
% PWS
>MRL
2.31%
5.34%

0.21%
0.80%
57.14%
0.00%
10.00%
5.70%
0.00%


0.47%
0.28%
0.19%
0.00%
100.00%
0.10%

1 .03%
2.35%
100.00%

0.34%
100.00%
100.00%
0.87%
0.00%
0.00%
1.41%
3.89%
2.99%
0.33%
100.00%
1 .46%
0.00%

0.91%
1 .64%
0.00%

1 .50%

1 .37%
%GW
PWS
>MRL
2.66%
6.45%

0.11%
0.78%
50.00%
0.00%
12.50%
5.26%
0.00%


0.67%
0.31%
0.34%
0.00%
100.00%
0.00%

1 .05%
2.82%
100.00%

0.39%
100.00%
0.00%
0.88%
0.00%
0.00%
1.19%
4.02%
2.61%
0.64%
0.00%
1 .28%
0.00%

0.96%
3.57%
0.00%

1 .49%

1 .38%
%sw
PWS
>MRL
0.78%
4.76%

0.94%
5.56%
50.00%
0.00%
0.00%
5.29%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
1 .96%

0.00%
0.00%
100.00%

0.00%
0.00%
100.00%
0.00%
0.00%
0.00%
1 .64%
1.81%
6.90%
0.00%
100.00%
2.94%
0.00%

0.00%
0.00%
0.00%

1 .66%

1 .39%
% PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
99%
VALUE
(M9/L)
7.70
9.00

< 5.00
4.30
5.10
< 0.50
72.90
6.00
< 0.50


< 8.00
< 2.00
< 5.00
< 0.50
44.00
< 0.50

< 2.00
< 2.00
0.90

< 0.50
26.10
9.50
< 1.00
< 1.00
< 0.20
< 1.00
0.50
0.15
< 0.50
5.10
< 20.00
< 1.00

< 0.50
< 8.00
< 1.50

0.60

0.50
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source
Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the
MCL; it does not necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the
average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Dichlorodifluoromethane is 1,000 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A. 18.b  URCIS (Round 1) Data- Dichlorodifluoromethane Occurrence in Public Water Systems - Based on Number of Sample
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
650
131

943
3,485
7
1
10
193
462


213
356
524
13
6
986

1,549
85
2

297
6
1
804
590
8
355
2,647
335
303
1
410
3

992
61
145

16,574

16,076
TOTAL #
SAMPLES
1,528
351

2,897
10,828
12
47
53
254
1,354


728
1,891
2,076
22
25
1,905

2,651
323
3

644
11
1
1,629
1,595
148
2,166
15,922
444
1,221
1
1,232
10

3,987
191
313

56,463

53,641
#GW
SAMPLES
1,267
244

2,250
10,742
7
0
44
54
953


485
1,488
1,119
18
25
1,438

2,583
297
2

569
11
0
1,442
1,475
136
1,619
15,009
363
434
0
1,126
0

3,656
82
259

49,197

47,038
#SW
SAMPLES
261
107

647
86
5
47
9
200
401


243
403
957
4
0
467

68
26
1

75
0
1
187
120
12
547
913
81
787
1
106
10

331
109
54

7,266

6,603
% TOTAL
SAMPLES
>MRL
2.36%
4.56%

0.10%
2.49%
50.00%
0.00%
1 .89%
4.72%
0.00%


0.55%
0.11%
0.05%
0.00%
100.00%
0.05%

0.68%
0.62%
100.00%

0.16%
100.00%
100.00%
0.49%
0.00%
0.00%
0.23%
1.07%
2.25%
0.08%
100.00%
0.81%
0.00%

0.50%
0.52%
0.00%

1.13%

1.09%
%GW
SAMPLES
>MRL
2.76%
5.74%

0.04%
2.49%
42.86%
0.00%
2.27%
5.56%
0.00%


0.82%
0.13%
0.09%
0.00%
100.00%
0.00%

0.70%
0.67%
100.00%

0.18%
100.00%
0.00%
0.55%
0.00%
0.00%
0.19%
1.12%
2.20%
0.23%
0.00%
0.80%
0.00%

0.55%
1.22%
0.00%

1 .24%

1.19%
%SW
SAMPLES
>MRL
0.38%
1.87%

0.31 %
2.33%
60.00%
0.00%
0.00%
4.50%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.21%

0.00%
0.00%
100.00%

0.00%
0.00%
100.00%
0.00%
0.00%
0.00%
0.37%
0.33%
2.47%
0.00%
100.00%
0.94%
0.00%

0.00%
0.00%
0.00%

0.43%

0.35%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.10
< 0.50
< 0.50
< 0.00
< 0.00


< 0.10
< 0.10
< 0.50
< 0.50
0.20
< 0.10

< 1.00
< 0.20
0.50

< 0.50
1.10
9.50
< 0.00
< 0.00
< 0.20
< 0.02
< 0.00
< 0.15
< 0.02
5.10
< 0.00
< 1.00

< 0.50
< 0.10
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
7.70
9.00

< 5.00
4.30
5.10
< 0.50
72.90
6.00
< 0.50


< 8.00
< 2.00
< 5.00
< 0.50
44.00
< 0.50

< 2.00
< 2.00
0.90

< 0.50
26.10
9.50
< 1.00
< 1.00
< 0.20
< 1.00
0.50
0.15
< 0.50
5.10
< 20.00
< 1.00

< 0.50
< 8.00
< 1.50

0.60

0.50
MAX VALUE
(M9/L)
98.00
32.00

3.00
404.90
5.10
< 0.50
72.90
10.00
< 0.50


0.34
1.00
93.00
< 0.50
44.00
0.40

7.10
8.10
0.90

7.30
26.10
9.50
14.00
< 5.00
< 0.20
14.00
39.00
1.89
12.00
5.10
1.00
< 1.00

18.00
20.00
< 2.00

404.90

404.90
MIN
DETECTS
(M9/L)
1.80
0.60

1.00
0.50
0.46

72.90
0.10



0.24
1.00
93.00

0.20
0.40

1.00
2.00
0.50

7.30
1.10
9.50
0.12


0.50
0.50
0.15
12.00
5.10
0.50


0.50
20.00


0.10

0.10
MEDIAN
DETECTS
(M9/L)
6.58
5.00

3.00
3.10
0.60

72.90
1.50



0.34
1.00
93.00

1.70
0.40

1.35
5.05
0.80

7.30
3.70
9.50
1.20


2.00
0.90
0.15
12.00
5.10
0.50


1.45
20.00


2.00

2.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (1
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.18.c URCIS (Round 1) Data- Dichlorodifluoromethane Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,528
351

2,897
10,828
12
47
53
254
1,354


728
1,891
2,076
22
25
1,905

2,651
323
3

644
11
1
1,629
1,595
148
2,166
15,922
444
1,221
1
1,232
10

3,987
191
313

56,463

53,641
TOTAL
UNIQUE
PWS
650
131

943
3,485
7
1
10
193
462


213
356
524
13
6
986

1,549
85
2

297
6
1
804
590
8
355
2,647
335
303
1
410
3

992
61
145

16,574

16,076
#GW
PWS
526
93

873
3,458
4
0
8
38
384


149
320
291
9
6
940

1,525
71
2

254
6
0
793
555
7
252
2,485
306
156
0
390
0

937
28
116

14,982

14,617
#SW
PWS
129
42

106
36
4
1
2
170
78


64
37
233
4
0
51

28
14
1

44
0
1
11
35
2
122
166
29
147
1
34
3

77
33
38

1,743

1,588
% PWS
>MRL
2.31%
5.34%

0.21%
0.80%
57.14%
0.00%
10.00%
5.70%
0.00%


0.47%
0.28%
0.19%
0.00%
100.00%
0.10%

1.03%
2.35%
100.00%

0.34%
100.00%
100.00%
0.87%
0.00%
0.00%
1.41%
3.89%
2.99%
0.33%
100.00%
1.46%
0.00%

0.91%
1.64%
0.00%

1.50%

1.37%
%GW
PWS
>MRL
2.66%
6.45%

0.11%
0.78%
50.00%
0.00%
12.50%
5.26%
0.00%


0.67%
0.31 %
0.34%
0.00%
100.00%
0.00%

1 .05%
2.82%
100.00%

0.39%
100.00%
0.00%
0.88%
0.00%
0.00%
1.19%
4.02%
2.61 %
0.64%
0.00%
1 .28%
0.00%

0.96%
3.57%
0.00%

1 .49%

1 .38%
%sw
PWS
>MRL
0.78%
4.76%

0.94%
5.56%
50.00%
0.00%
0.00%
5.29%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
1.96%

0.00%
0.00%
100.00%

0.00%
0.00%
100.00%
0.00%
0.00%
0.00%
1.64%
1.81%
6.90%
0.00%
100.00%
2.94%
0.00%

0.00%
0.00%
0.00%

1.66%

1.39%
% PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the
The Maximum Contaminant Level (MCL) for Dichlorodifluoromethane is 1,000 ug/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.19.a URCIS (Round 1) Data- 1,1-Dichloroethane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATE
TOTAL
UNIQUE
PWS
660
131

944
3,536
11
1
13
226
1,162
127
1,002
1,302
370
524
13
40
986
10
1,565
85
2
565
297
7
14
1,518
590
8
355
2,655
335
291
2
423
3
1
992
137
145

21 ,048

20,483
# GW
PWS
532
93

874
3,507
9
0
11
42
1,053
112
963
1,187
332
291
9
34
940
9
1,540
71
2
523
254
7
14
1,493
555
7
252
2,492
306
150
2
403
0
1
937
63
116

19,186

18,758
#SW
PWS
133
42

106
37
4
1
2
205
109
16
39
115
39
233
4
10
51
1
29
14
0
57
44
0
0
25
35
2
122
167
29
141
0
34
3
0
77
75
38

2,039

1,876
% PWS
>MRL
0.15%
3.05%

0.53%
1 .39%
18.18%
0.00%
23.08%
7.08%
0.43%
0.00%
0.30%
1 .46%
2.70%
0.76%
0.00%
77.50%
1.12%
100.00%
0.64%
0.00%
100.00%
0.35%
3.37%
100.00%
100.00%
2.17%
0.17%
0.00%
1 .97%
1 .32%
0.00%
0.34%
100.00%
0.95%
0.00%
100.00%
0.20%
0.00%
5.52%

1 .48%

1.14%
%GW
PWS
>MRL
0.19%
2.15%

0.46%
1 .40%
22.22%
0.00%
27.27%
7.14%
0.38%
0.00%
0.31%
1 .52%
2.41%
1 .03%
0.00%
82.35%
0.96%
100.00%
0.65%
0.00%
100.00%
0.38%
3.94%
100.00%
100.00%
2.14%
0.18%
0.00%
2.38%
1 .36%
0.00%
0.00%
100.00%
0.74%
0.00%
100.00%
0.21%
0.00%
5.17%

1 .45%

1 .09%
%sw
PWS
>MRL
0.00%
4.76%

0.94%
0.00%
25.00%
0.00%
0.00%
6.34%
0.92%
0.00%
0.00%
0.87%
5.13%
0.43%
0.00%
70.00%
3.92%
100.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
4.00%
0.00%
0.00%
0.82%
0.60%
0.00%
0.71%
0.00%
2.94%
0.00%
0.00%
0.00%
0.00%
5.26%

1.91%

1 .55%
% PWS
>MCL
0.00%
0.00%

0.21%
0.31%
9.09%
0.00%
7.69%
1 .77%
0.17%
0.00%
0.00%
0.23%
0.27%
0.00%
0.00%
15.00%
0.10%
40.00%
0.06%
0.00%
0.00%
0.18%
0.67%
14.29%
14.29%
0.20%
0.00%
0.00%
0.28%
0.11%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.07%

0.26%

0.18%
%GW
PWS
>MCL
0.00%
0.00%

0.11%
0.31%
11.11%
0.00%
9.09%
0.00%
0.19%
0.00%
0.00%
0.25%
0.30%
0.00%
0.00%
17.65%
0.11%
44.44%
0.06%
0.00%
0.00%
0.19%
0.79%
14.29%
14.29%
0.20%
0.00%
0.00%
0.40%
0.12%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.86%

0.24%

0.16%
%sw
PWS
>MCL
0.00%
0.00%

0.94%
0.00%
0.00%
0.00%
0.00%
1 .95%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
5.26%

0.34%

0.37%
99%
VALUE
(M9/L)
< 0.00
0.60

< 1.00
1.00
9.30
< 0.50
< 0.50
11.00
< 0.50
< 0.30
< 1.00
1.00
1.72
< 1.00
< 0.50
8.20
< 1.00
41.00
< 0.20
< 2.00
1.40
< 1.00
1.10
6.10
3.00
1.10
< 1.00
< 0.20
0.80
< 1.00
< 0.50
< 0.50
8.90
< 5.00
< 1.00
0.80
< 0.50
< 4.00
1.90

1.07

0.10
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source
Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the
MCL; it does not necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the
average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for 1,1-Dichloroethane is 5 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.19.b URCIS (Round 1) Data- 1,1-Dichloroethane Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
660
131

944
3,536
11
1
13
226
1,162
127
1,002
1,302
370
524
13
40
986
10
1,565
85
2
565
297
7
14
1,518
590
8
355
2,655
335
291
2
423
3
1
992
137
145

21,048

20,483
TOTAL #
SAMPLES
1,611
351

2,968
1 1 ,899
86
63
333
330
2,460
1,221
1,908
6,009
2,238
2,311
22
125
1,909
236
2,753
329
6
1,624
647
13
32
3,173
1,595
148
2,172
16,083
444
995
3
1,331
10
1
3,987
657
313

72,396

68,817
#GW
SAMPLES
1,325
244

2,308
1 1 ,804
82
0
189
72
1,861
1,081
1,697
5,043
1,542
1,172
18
109
1,441
234
2,674
297
6
1,376
572
13
32
2,808
1,475
136
1,622
15,163
363
342
3
1,217
0
1
3,656
204
259

62,441

59,699
#SW
SAMPLES
286
107

660
95
4
63
144
258
599
140
211
966
696
1,139
4
16
468
2
79
32
0
248
75
0
0
365
120
12
550
920
81
653
0
114
10
0
331
453
54

9,955

9,118
% TOTAL
SAMPLES
>MRL
0.12%
1.14%

0.17%
1 .57%
63.95%
0.00%
0.90%
6.36%
0.41%
0.00%
0.16%
1 .43%
3.53%
0.39%
0.00%
85.60%
0.73%
100.00%
0.51 %
0.00%
100.00%
0.31%
2.63%
100.00%
100.00%
2.21%
0.06%
0.00%
1 .38%
0.93%
0.00%
0.10%
100.00%
0.60%
0.00%
100.00%
0.15%
0.00%
2.88%

1 .64%

1 .02%
%GW
SAMPLES
>MRL
0.15%
0.82%

0.17%
1 .58%
65.85%
0.00%
1 .59%
8.33%
0.38%
0.00%
0.18%
1 .67%
4.28%
0.68%
0.00%
87.16%
0.83%
100.00%
0.52%
0.00%
100.00%
0.36%
2.97%
100.00%
100.00%
2.46%
0.07%
0.00%
1 .79%
0.98%
0.00%
0.00%
100.00%
0.58%
0.00%
100.00%
0.16%
0.00%
2.70%

1 .80%

1.10%
%SW
SAMPLES
>MRL
0.00%
1 .87%

0.15%
0.00%
25.00%
0.00%
0.00%
5.81 %
0.50%
0.00%
0.00%
0.21%
1 .87%
0.09%
0.00%
75.00%
0.43%
100.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.27%
0.00%
0.00%
0.18%
0.11%
0.00%
0.15%
0.00%
0.88%
0.00%
0.00%
0.00%
0.00%
3.70%

0.61 %

0.49%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.02
< 0.00
< 0.00
< 0.50
< 0.10
< 0.00
< 0.00
< 0.00
< 0.30
< 0.03
< 0.08
< 0.50
< 0.50
< 0.00
< 0.10
1.00
< 0.20
< 0.20
0.50
< 0.50
< 0.11
0.30
0.35
< 0.00
< 0.00
< 0.20
< 0.04
< 0.00
< 0.50
< 0.07
2.00
< 0.00
< 1.00
0.80
< 0.50
< 0.05
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
0.60

< 1.00
1.00
9.30
< 0.50
< 0.50
11.00
< 0.50
< 0.30
< 1.00
1.00
1.72
< 1.00
< 0.50
8.20
< 1.00
41.00
< 0.20
< 2.00
1.40
< 1.00
1.10
6.10
3.00
1.10
< 1.00
< 0.20
0.80
< 1.00
< 0.50
< 0.50
8.90
< 5.00
< 1.00
0.80
< 0.50
< 4.00
1.90

1.07

0.10
MAX
VALUE
(M9/L)
4.00
2.40

500.00
30.00
9.30
< 0.50
12.60
15.40
9.10
< 0.30
1.00
27.00
15.60
2.40
< 0.50
16.00
10.00
78.00
11.00
< 2.00
1.40
11.00
8.30
6.10
30.00
28.00
4.30
< 0.20
65.00
45.90
< 0.50
0.60
8.90
1.00
< 1.00
0.80
0.70
< 4.00
23.00

500.00

500.00
MIN
DETECTS
(M9/L)
1.7
0.60

0.30
0.10
0.09

0.10
0.01
0.60

1.00
0.03
0.09
1.30

0.09
0.20
1.00
0.20

0.50
1.40
0.11
0.30
0.35
0.05
4.30

0.33
0.20

0.60
2.00
0.10

0.80
0.50

0.20

0.01

0.01
MEDIAN
DETECTS
(M9/L)
2.85
2.05

4.00
1.20
2.00

0.50
1.00
2.75

1.00
1.40
1.09
2.00

1.00
0.90
4.50
0.50

0.95
2.00
1.04
0.80
3.49
1.00
4.30

2.00
1.30

0.60
8.90
0.10

0.80
0.65

0.60

1.49

1.20
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.19.C URCIS (Round 1) Data- 1,1-Dichloroethane Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,611
351

2,968
11,899
86
63
333
330
2,460
1,221
1,908
6,009
2,238
2,311
22
125
1,909
236
2,753
329
6
1,624
647
13
32
3,173
1,595
148
2,172
16,083
444
995
3
1,331
10
1
3,987
657
313

72,396

68,817
TOTAL
UNIQUE
PWS
660
131

944
3,536
11
1
13
226
1,162
127
1,002
1,302
370
524
13
40
986
10
1,565
85
2
565
297
7
14
1,518
590
8
355
2,655
335
291
2
423
3
1
992
137
145

21,048

20,483
#GW
PWS
532
93

874
3,507
9
0
11
42
1,053
112
963
1,187
332
291
9
34
940
9
1,540
71
2
523
254
7
14
1,493
555
7
252
2,492
306
150
2
403
0
1
937
63
116

19,186

18,758
#SW
PWS
133
42

106
37
4
1
2
205
109
16
39
115
39
233
4
10
51
1
29
14
0
57
44
0
0
25
35
2
122
167
29
141
0
34
3
0
77
75
38

2,039

1,876
% PWS
>MRL
0.15%
3.05%

0.53%
1.39%
18.18%
0.00%
23.08%
7.08%
0.43%
0.00%
0.30%
1.46%
2.70%
0.76%
0.00%
77.50%
1.12%
100.00%
0.64%
0.00%
100.00%
0.35%
3.37%
100.00%
100.00%
2.17%
0.17%
0.00%
1.97%
1.32%
0.00%
0.34%
100.00%
0.95%
0.00%
100.00%
0.20%
0.00%
5.52%

1.48%

1.14%
%GW
PWS
>MRL
0.19%
2.15%

0.46%
1 .40%
22.22%
0.00%
27.27%
7.14%
0.38%
0.00%
0.31 %
1 .52%
2.41 %
1 .03%
0.00%
82.35%
0.96%
100.00%
0.65%
0.00%
100.00%
0.38%
3.94%
100.00%
100.00%
2.14%
0.18%
0.00%
2.38%
1 .36%
0.00%
0.00%
100.00%
0.74%
0.00%
100.00%
0.21 %
0.00%
5.17%

1 .45%

1 .09%
%sw
PWS
>MRL
0.00%
4.76%

0.94%
0.00%
25.00%
0.00%
0.00%
6.34%
0.92%
0.00%
0.00%
0.87%
5.13%
0.43%
0.00%
70.00%
3.92%
100.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
4.00%
0.00%
0.00%
0.82%
0.60%
0.00%
0.71%
0.00%
2.94%
0.00%
0.00%
0.00%
0.00%
5.26%

1.91%

1.55%
% PWS
> 1/2 MCL
0.15%
0.00%

0.32%
0.45%
9.09%
0.00%
7.69%
2.21 %
0.17%
0.00%
0.00%
0.38%
1 .35%
0.00%
0.00%
25.00%
0.10%
60.00%
0.06%
0.00%
0.00%
0.35%
1 .01 %
14.29%
42.86%
0.33%
0.17%
0.00%
0.56%
0.45%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.07%

0.44%

0.32%
%GW
PWS
> 1/2 MCL
0.19%
0.00%

0.23%
0.46%
11.11%
0.00%
9.09%
0.00%
0.19%
0.00%
0.00%
0.34%
1.20%
0.00%
0.00%
29.41%
0.11%
66.67%
0.06%
0.00%
0.00%
0.38%
1.18%
14.29%
42.86%
0.33%
0.18%
0.00%
0.40%
0.48%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.86%

0.43%

0.29%
%sw
PWS
> 1/2 MCL
0.00%
0.00%

0.94%
0.00%
0.00%
0.00%
0.00%
2.44%
0.00%
0.00%
0.00%
0.87%
2.56%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.82%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
5.26%

0.54%

0.53%
% PWS
>MCL
0.00%
0.00%

0.21%
0.31%
9.09%
0.00%
7.69%
1.77%
0.17%
0.00%
0.00%
0.23%
0.27%
0.00%
0.00%
15.00%
0.10%
40.00%
0.06%
0.00%
0.00%
0.18%
0.67%
14.29%
14.29%
0.20%
0.00%
0.00%
0.28%
0.11%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.07%

0.26%

0.18%
%GW
PWS
>MCL
0.00%
0.00%

0.11%
0.31 %
11.11%
0.00%
9.09%
0.00%
0.19%
0.00%
0.00%
0.25%
0.30%
0.00%
0.00%
17.65%
0.11%
44.44%
0.06%
0.00%
0.00%
0.19%
0.79%
14.29%
14.29%
0.20%
0.00%
0.00%
0.40%
0.12%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.86%

0.24%

0.16%
%sw
PWS
>MCL
0.00%
0.00%

0.94%
0.00%
0.00%
0.00%
0.00%
1.95%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
5.26%

0.34%

0.37%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the

The Maximum Contaminant Level (MCL) for 1,1-Dichloroethane is 5 ug/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.20.a URCIS (Round 1) Data- 1,2-Dichloroethane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATE
TOTAL
UNIQUE
PWS
686
133

970
3,544
11
1
13

1,163
19


395
525
13
14
844
12
1,564
85
7

297
43

1,242
590
10
356
1,687


3
418
3

992
69
144

15,853

15,282
# GW
PWS
555
95

895
3,514
9
0
11

1,054
15


350
291
9
11
798
11
1,539
71
7

254
43

1,239
555
8
253
1,557


3
396
0

937
32
116

14,628

14,192
#SW
PWS
137
42

118
42
3
1
2

109
4


46
234
4
3
51
1
29
14
0

44
0

3
35
4
122
134


0
36
3

77
37
37

1,372

1,215
% PWS
>MRL
1.17%
0.75%

0.31%
1 .69%
45.45%
0.00%
7.69%

0.00%
0.00%


0.76%
1 .52%
7.69%
64.29%
1 .42%
100.00%
1 .53%
0.00%
100.00%

4.04%
100.00%

1 .93%
0.17%
0.00%
0.56%
0.47%


100.00%
1.91%
0.00%

0.30%
0.00%
1 .39%

1 .64%

1.16%
%GW
PWS
>MRL
1 .26%
1 .05%

0.22%
1 .62%
44.44%
0.00%
9.09%

0.00%
0.00%


0.86%
1 .03%
11.11%
81 .82%
1 .25%
100.00%
1 .56%
0.00%
100.00%

3.54%
100.00%

1 .94%
0.18%
0.00%
0.40%
0.45%


100.00%
1 .26%
0.00%

0.32%
0.00%
0.00%

1.61%

1.10%
%sw
PWS
>MRL
0.73%
0.00%

0.85%
7.14%
66.67%
0.00%
0.00%

0.00%
0.00%


0.00%
2.14%
0.00%
0.00%
3.92%
100.00%
0.00%
0.00%
0.00%

6.82%
0.00%

0.00%
0.00%
0.00%
0.82%
0.75%


0.00%
8.33%
0.00%

0.00%
0.00%
5.41%

1 .82%

1 .73%
% PWS
>MCL
0.29%
0.00%

0.21%
0.34%
0.00%
0.00%
0.00%

0.00%
0.00%


0.00%
0.38%
0.00%
7.14%
0.24%
33.33%
0.06%
0.00%
0.00%

0.67%
18.60%

0.24%
0.00%
0.00%
0.28%
0.12%


33.33%
0.00%
0.00%

0.10%
0.00%
0.00%

0.28%

0.19%
%GW
PWS
>MCL
0.36%
0.00%

0.11%
0.31%
0.00%
0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
9.09%
0.25%
27.27%
0.06%
0.00%
0.00%

0.39%
18.60%

0.24%
0.00%
0.00%
0.00%
0.13%


33.33%
0.00%
0.00%

0.11%
0.00%
0.00%

0.25%

0.17%
%sw
PWS
>MCL
0.00%
0.00%

0.85%
2.38%
0.00%
0.00%
0.00%

0.00%
0.00%


0.00%
0.85%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%

2.27%
0.00%

0.00%
0.00%
0.00%
0.82%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.51%

0.41%
99%
VALUE
(M9/L)
< 0.00
< 0.50

< 2.00
1.90
0.84
< 1.00
1.00

< 0.50
< 0.30


< 2.00
< 1.00
1.90
5.90
0.10
24.00
0.30
< 2.00
3.00

1.40
39.50

1.10
< 1.00
< 0.20
< 1.00
< 0.50


9.00
< 5.00
< 0.50

< 0.50
< 4.00
< 0.70

0.86

< 5.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source
Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the
MCL; it does not necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the
average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for 1,2-Dichloroethane is 5 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.20.b URCIS (Round 1) Data- 1,2-Dichloroethane Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
686
133

970
3,544
11
1
13

1,163
19


395
525
13
14
844
12
1,564
85
7

297
43

1,242
590
10
356
1,687


3
418
3

992
69
144

15,853

15,282
TOTAL #
SAMPLES
1,783
353

3,093
1 1 ,987
43
66
334

2,462
61


2,621
3,684
22
23
1,786
133
2,752
329
25

644
129

1,762
1,595
191
2,169
6,370


8
1,288
10

3,987
463
310

50,483

47,001
#GW
SAMPLES
1,480
246

2,385
1 1 ,876
37
0
190

1,864
34


1,804
1,405
18
19
1,306
97
2,673
297
25

569
129

1,753
1,475
155
1,619
5,755


8
1,173
0

3,656
130
259

42,437

39,843
#SW
SAMPLES
303
107

708
111
6
66
144

598
27


817
2,279
4
4
480
36
79
32
0

75
0

9
120
36
550
615


0
115
10

331
333
51

8,046

7,158
% TOTAL
SAMPLES
>MRL
0.67%
0.28%

0.10%
2.29%
25.58%
0.00%
1 .80%

0.00%
0.00%


0.15%
0.41%
4.55%
39.13%
1.01%
100.00%
1 .45%
0.00%
100.00%

2.48%
100.00%

2.21%
0.38%
0.00%
0.09%
0.30%


100.00%
0.85%
0.00%

0.08%
0.00%
0.65%

1 .56%

0.99%
%GW
SAMPLES
>MRL
0.68%
0.41%

0.08%
2.27%
16.22%
0.00%
3.16%

0.00%
0.00%


0.22%
0.21%
5.56%
47.37%
1 .00%
100.00%
1 .50%
0.00%
100.00%

2.28%
100.00%

2.22%
0.41 %
0.00%
0.06%
0.30%


100.00%
0.68%
0.00%

0.08%
0.00%
0.00%

1 .67%

1 .07%
%SW
SAMPLES
>MRL
0.66%
0.00%

0.14%
5.41 %
83.33%
0.00%
0.00%

0.00%
0.00%


0.00%
0.53%
0.00%
0.00%
1 .04%
100.00%
0.00%
0.00%
0.00%

4.00%
0.00%

0.00%
0.00%
0.00%
0.18%
0.33%


0.00%
2.61%
0.00%

0.00%
0.00%
3.92%

0.97%

0.50%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.00
< 0.50
< 0.20

< 0.50
< 0.30


< 0.10
< 0.10
< 0.50
< 0.37
< 0.10
1.00
< 0.20
< 0.20
0.50

< 0.50
0.10

< 0.00
< 0.00
< 0.05
< 0.10
< 0.00


0.80
< 0.10
< 0.50

< 0.50
< 0.05
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
< 0.50

< 2.00
1.90
0.84
< 1.00
1.00

< 0.50
< 0.30


< 2.00
< 1.00
1.90
5.90
0.10
24.00
0.30
< 2.00
3.00

1.40
39.50

1.10
< 1.00
< 0.20
< 1.00
< 0.50


9.00
< 5.00
< 0.50

< 0.50
< 4.00
< 0.70

0.86

< 5.00
MAX
VALUE
(M9/L)
7.00
0.70

500.00
24.00
0.84
< 1.00
4.80

< 0.50
< 0.30


2.23
141.00
1.90
5.90
31.00
25.00
5.80
< 2.00
3.00

420.00
59.60

19.80
0.80
< 0.20
12.00
9.50


9.00
1.80
< 0.50

6.20
< 4.00
0.70

500.00

500.00
MIN
DETECTS
(M9/L)
0.70
0.70

0.50
0.20
0.18

0.20





0.38
0.70
1.90
0.37
0.10
1.00
0.20

0.50

0.52
0.10

0.06
0.50

0.49
0.35


0.80
0.10


0.50

0.30

0.06

0.06
MEDIAN
DETECTS
(M9/L)
2.00
0.70

17.00
1.40
0.41

1.15





0.69
2.00
1.90
1.00
0.85
2.00
0.50

1.00

0.85
0.70

1.08
0.50

6.25
0.84


1.30
0.10


0.60

0.50

1.10

1.10
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                               Occurrence of Unregulated Contaminants in Public Water Systems
Table A.20.C  URCIS (Round 1) Data- 1,2-Dichloroethane Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,783
353

3,093
11,987
43
66
334

2,462
61


2,621
3,684
22
23
1,786
133
2,752
329
25

644
129

1,762
1,595
191
2,169
6,370


8
1,288
10

3,987
463
310

50,483

47,001
TOTAL
UNIQUE
PWS
686
133

970
3,544
11
1
13

1,163
19


395
525
13
14
844
12
1,564
85
7

297
43

1,242
590
10
356
1,687


3
418
3

992
69
144

15,853

15,282
#GW
PWS
555
95

895
3,514
9
0
11

1,054
15


350
291
9
11
798
11
1,539
71
7

254
43

1,239
555
8
253
1,557


3
396
0

937
32
116

14,628

14,192
# SW PWS
137
42

118
42
3
1
2

109
4


46
234
4
3
51
1
29
14
0

44
0

3
35
4
122
134


0
36
3

77
37
37

1,372

1,215
% PWS
>MRL
1.17%
0.75%

0.31%
1 .69%
45.45%
0.00%
7.69%

0.00%
0.00%


0.76%
1 .52%
7.69%
64.29%
1 .42%
100.00%
1 .53%
0.00%
100.00%

4.04%
100.00%

1 .93%
0.17%
0.00%
0.56%
0.47%


100.00%
1.91%
0.00%

0.30%
0.00%
1 .39%

1 .64%

1.16%
%GW
PWS
>MRL
1 .26%
1 .05%

0.22%
1 .62%
44.44%
0.00%
9.09%

0.00%
0.00%


0.86%
1 .03%
11.11%
81 .82%
1 .25%
100.00%
1 .56%
0.00%
100.00%

3.54%
100.00%

1 .94%
0.18%
0.00%
0.40%
0.45%


100.00%
1 .26%
0.00%

0.32%
0.00%
0.00%

1.61%

1.10%
%sw
PWS
>MRL
0.73%
0.00%

0.85%
7.14%
66.67%
0.00%
0.00%

0.00%
0.00%


0.00%
2.14%
0.00%
0.00%
3.92%
100.00%
0.00%
0.00%
0.00%

6.82%
0.00%

0.00%
0.00%
0.00%
0.82%
0.75%


0.00%
8.33%
0.00%

0.00%
0.00%
5.41%

1 .82%

1 .73%
% PWS
> 1/2 MCL
0.44%
0.00%

0.21%
0.65%
0.00%
0.00%
7.69%

0.00%
0.00%


0.00%
0.38%
7.69%
0.00%
0.47%
58.33%
0.13%
0.00%
14.29%

1.01%
23.26%

0.64%
0.00%
0.00%
0.28%
0.12%


33.33%
0.00%
0.00%

0.10%
0.00%
0.00%

0.45%

0.33%
%GW
PWS
> 1/2 MCL
0.54%
0.00%

0.11%
0.63%
0.00%
0.00%
9.09%

0.00%
0.00%


0.00%
0.00%
11.11%
0.00%
0.50%
54.55%
0.13%
0.00%
14.29%

0.79%
23.26%

0.65%
0.00%
0.00%
0.00%
0.13%


33.33%
0.00%
0.00%

0.11%
0.00%
0.00%

0.44%

0.32%
%SW
PWS
> 1/2 MCL
0.00%
0.00%

0.85%
2.38%
0.00%
0.00%
0.00%

0.00%
0.00%


0.00%
0.85%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%

2.27%
0.00%

0.00%
0.00%
0.00%
0.82%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.51%

0.41%
% PWS
>MCL
0.29%
0.00%

0.21%
0.34%
0.00%
0.00%
0.00%

0.00%
0.00%


0.00%
0.38%
0.00%
7.14%
0.24%
33.33%
0.06%
0.00%
0.00%

0.67%
18.60%

0.24%
0.00%
0.00%
0.28%
0.12%


33.33%
0.00%
0.00%

0.10%
0.00%
0.00%

0.28%

0.19%
%GW
PWS
>MCL
0.36%
0.00%

0.11%
0.31%
0.00%
0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
9.09%
0.25%
27.27%
0.06%
0.00%
0.00%

0.39%
18.60%

0.24%
0.00%
0.00%
0.00%
0.13%


33.33%
0.00%
0.00%

0.11%
0.00%
0.00%

0.25%

0.17%
%sw
PWS
>MCL
0.00%
0.00%

0.85%
2.38%
0.00%
0.00%
0.00%

0.00%
0.00%


0.00%
0.85%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%

2.27%
0.00%

0.00%
0.00%
0.00%
0.82%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.51%

0.41%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy
The Maximum Contaminant Level (MCL) for 1,2-Dichloroethane is 5 [ig/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.21.a URCIS (Round 1) Data- Dichloroethene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATE
TOTAL
UNIQUE
PWS
671
132

970
3,527
11
1
13
186
1,162
19


392
525
13
27
844
12
1,565
78
3

297
8

1,242
590
10
355
1,687


1
416
3

992
69
144

15,965

15,430
# GW
PWS
542
94

894
3,498
9

11
24
1,053
15


347
291
9
22
798
12
1,540
64
3

254
8

1,239
555
8
252
1,557


1
394


937
32
116

14,579

14,180
#SW
PWS
135
42

119
41
3
1
2
167
109
4


46
234
4
5
51

29
14


44


3
35
4
122
134



36
3

77
37
37

1,538

1,380
% PWS
>MRL
0.60%
3.79%

0.31%
1 .98%
18.18%
100.00%
15.38%
6.99%
0.34%
0.00%


2.30%
2.48%
7.69%
81 .48%
1 .07%
100.00%
0.19%
0.00%
100.00%

4.71%
100.00%

1 .69%
0.00%
0.00%
1 .69%
0.36%


100.00%
0.96%
0.00%

0.20%
0.00%
0.69%

1 .50%

1.17%
%GW
PWS
>MRL
0.74%
5.32%

0.11%
2.00%
22.22%
0.00%
18.18%
12.50%
0.38%
0.00%


2.02%
0.00%
11.11%
81 .82%
0.88%
100.00%
0.19%
0.00%
100.00%

5.12%
100.00%

1 .69%
0.00%
0.00%
1 .98%
0.39%


100.00%
1 .02%
0.00%

0.21%
0.00%
0.86%

1 .39%

1 .06%
%sw
PWS
>MRL
0.00%
0.00%

1 .68%
0.00%
0.00%
100.00%
500.00%
0.00%
0.00%
0.00%


4.35%
5.56%
0.00%
80.00%
3.92%
0.00%
0.00%
0.00%
0.00%

2.27%
0.00%

0.00%
0.00%
0.00%
0.82%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

2.34%

1 .45%
% PWS
>MCL
0.15%
0.76%

0.10%
0.40%
9.09%
0.00%
0.00%
0.00%
0.09%
0.00%


0.77%
0.38%
0.00%
7.41%
0.00%
16.67%
0.00%
0.00%
0.00%

1.01%
37.50%

0.16%
0.00%
0.00%
0.28%
0.12%


100.00%
0.24%
0.00%

0.00%
0.00%
0.00%

0.26%

0.20%
%GW
PWS
>MCL
0.18%
1 .06%

0.00%
0.40%
11.11%
0.00%
0.00%
0.00%
0.09%
0.00%


0.86%
0.00%
0.00%
4.55%
0.00%
16.67%
0.00%
0.00%
0.00%

1.18%
37.50%

0.16%
0.00%
0.00%
0.40%
0.13%


100.00%
0.25%
0.00%

0.00%
0.00%
0.00%

0.25%

0.20%
%sw
PWS
>MCL
0.00%
0.00%

0.84%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.85%
0.00%
20.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.26%

0.22%
99%
VALUE
(M9/L)
< 0.00
1.80

< 2.00
4.80
7.30
0.60
1.00
1.20
< 0.50
< 0.30


1.62
< 1.00
1.20
14.00
< 1.00
12.00
< 0.50
< 2.00
5.30

7.40
49.40

1.67
< 1.00
< 0.20
< 10.00
< 0.50


24.00
< 2.50
< 0.50

< 0.50
< 4.00
< 1.30

2.27

1.80
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source
Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the
MCL; it does not necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the
average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Dichloroethene is 7 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.21 .b URCIS (Round 1) Data- Dichloroethene Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
671
132

970
3,527
11
1
13
186
1,162
19


392
525
13
27
844
12
1,565
78
3

297
8

1,242
590
10
355
1,687


1
416
3

992
69
144

15,965

15,430
TOTAL #
SAMPLES
1,754
354

3,092
13,296
105
66
334
234
2,464
60


2,632
3,686
22
67
1,786
75
2,754
282
22

644
19

1,773
1,595
191
2,171
6,368


2
1,276
10

3,987
463
310

51 ,894

48,528
#GW
SAMPLES
1,457
247

2,376
13,161
102

190
36
1,865
33


1,814
1,406
18
59
1,306
75
2,675
250
22

569
19

1,764
1,475
155
1,621
5,753


2
1,164


3,656
130
259

43,659

41,146
#SW
SAMPLES
297
107

716
135
3
66
144
198
599
27


818
2,280
4
8
480

79
32


75


9
120
36
550
615



112
10

331
333
51

8,235

7,382
% TOTAL
SAMPLES
>MRL
0.74%
1.98%

0.10%
9.30%
66.67%
1.52%
1 .50%
5.98%
0.28%
0.00%


2.51%
0.41%
4.55%
71 .64%
0.50%
100.00%
0.22%
0.00%
100.00%

4.19%
100.00%

2.88%
0.00%
0.00%
0.97%
0.24%


100.00%
0.63%
0.00%

0.23%
0.00%
0.32%

3.38%

3.07%
%GW
SAMPLES
>MRL
0.89%
2.83%

0.04%
9.40%
68.63%
0.00%
2.63%
11.11%
0.38%
0.00%


3.36%
0.00%
5.56%
74.58%
0.54%
100.00%
0.22%
0.00%
100.00%

4.57%
100.00%

2.89%
0.00%
0.00%
1.23%
0.26%


100.00%
0.69%
0.00%

0.25%
0.00%
0.39%

3.92%

3.53%
%SW
SAMPLES
>MRL
0.00%
0.00%

0.28%
0.00%
0.00%
1.52%
6.94%
0.00%
0.00%
0.00%


0.61%
0.66%
0.00%
50.00%
0.42%
0.00%
0.00%
0.00%
0.00%

1 .33%
0.00%

0.00%
0.00%
0.00%
0.18%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.50%

0.34%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.09
< 0.50
< 0.30
< 0.00
< 0.50
< 0.30


< 0.07
< 0.08
< 0.50
< 0.00
< 0.10
1.00
< 0.20
< 0.20
0.70

< 0.50
0.30

< 0.00
< 0.00
< 0.05
< 0.10
< 0.20


21.00
< 0.10
< 0.50

< 0.50
< 0.05
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
1.80

< 2.00
4.80
7.30
0.60
1.00
1.20
< 0.50
< 0.30


1.62
< 1.00
1.20
14.00
< 1.00
12.00
< 0.50
< 2.00
5.30

7.40
49.40

1.67
< 1.00
< 0.20
< 10.00
< 0.50


24.00
< 2.50
< 0.50

< 0.50
< 4.00
< 1.30

2.27

1.80
MAX VALUE
(M9/L)
8.00
7.50

2,300.00
99.05
8.00
0.60
2.20
3.13
19.90
< 0.30


13.00
75.00
1.20
14.00
1.60
12.00
5.70
< 2.00
5.30

440.00
49.40

70.00
< 5.00
< 0.20
51.00
40.40


24.00
15.00
< 0.50

0.90
< 4.00
1.10

2,300.00

2,300.00
MIN
DETECTS
(M9/L)
0.40
0.80

0.50
0.10
0.30
0.60
0.60
0.05
1.30



0.11
1.00
1.20
0.20
0.10
1.00
0.30

0.70

0.60
0.30

0.16


0.60
0.30


21.00
0.10


0.60

1.10

0.05

0.05
MEDIAN
DETECTS
(M9/L)
0.60
1.80

0.50
1.10
2.15
0.60
1.00
1.00
1.90



1.21
3.00
1.20
1.03
0.80
4.00
1.35

1.80

2.40
2.80

0.93


2.00
2.30


22.50
0.10


0.80

1.10

1.20

1.10
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (1
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.21 .c URCIS (Round 1) Data- Dichloroethene Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,754
354

3,092
13,296
105
66
334
234
2,464
60


2,632
3,686
22
67
1,786
75
2,754
282
22

644
19

1,773
1,595
191
2,171
6,368


2
1,276
10

3,987
463
310

51,894

48,528
TOTAL
UNIQUE
PWS
671
132

970
3,527
11
1
13
186
1,162
19


392
525
13
27
844
12
1,565
78
3

297
8

1,242
590
10
355
1,687


1
416
3

992
69
144

15,965

15,430
#GW
PWS
542
94

894
3,498
9

11
24
1,053
15


347
291
9
22
798
12
1,540
64
3

254
8

1,239
555
8
252
1,557


1
394


937
32
116

14,579

14,180
#SW
PWS
135
42

119
41
3
1
2
167
109
4


46
234
4
5
51

29
14


44


3
35
4
122
134



36
3

77
37
37

1,538

1,380
% PWS
>MRL
0.60%
3.79%

0.31%
1.98%
18.18%
100.00%
15.38%
6.99%
0.34%
0.00%


2.30%
2.48%
7.69%
81.48%
1.07%
100.00%
0.19%
0.00%
100.00%

4.71%
100.00%

1.69%
0.00%
0.00%
1.69%
0.36%


100.00%
0.96%
0.00%

0.20%
0.00%
0.69%

1.50%

1.17%
%GW
PWS
>MRL
0.74%
5.32%

0.11%
2.00%
22.22%
0.00%
18.18%
12.50%
0.38%
0.00%


2.02%
0.00%
11.11%
81 .82%
0.88%
100.00%
0.19%
0.00%
100.00%

5.12%
100.00%

1 .69%
0.00%
0.00%
1 .98%
0.39%


100.00%
1 .02%
0.00%

0.21 %
0.00%
0.86%

1 .39%

1 .06%
%sw
PWS
>MRL
0.00%
0.00%

1.68%
0.00%
0.00%
100.00%
500.00%
0.00%
0.00%
0.00%


4.35%
5.56%
0.00%
80.00%
3.92%
0.00%
0.00%
0.00%
0.00%

2.27%
0.00%

0.00%
0.00%
0.00%
0.82%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

2.34%

1.45%
% PWS
> 1/2 MCL
0.30%
1 .52%

0.10%
0.79%
9.09%
0.00%
0.00%
0.00%
0.09%
0.00%


1 .02%
1.14%
0.00%
14.81%
0.00%
33.33%
0.06%
0.00%
33.33%

2.02%
62.50%

0.16%
0.00%
0.00%
0.56%
0.24%


100.00%
0.24%
0.00%

0.00%
0.00%
0.00%

0.48%

0.38%
%GW
PWS
> 1/2 MCL
0.37%
2.13%

0.00%
0.80%
11.11%
0.00%
0.00%
0.00%
0.09%
0.00%


1.15%
0.00%
0.00%
9.09%
0.00%
33.33%
0.06%
0.00%
33.33%

2.36%
62.50%

0.16%
0.00%
0.00%
0.40%
0.26%


100.00%
0.25%
0.00%

0.00%
0.00%
0.00%

0.45%

0.36%
%sw
PWS
> 1/2 MCL
0.00%
0.00%

0.84%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
2.56%
0.00%
40.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.82%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.65%

0.51 %
% PWS
>MCL
0.15%
0.76%

0.10%
0.40%
9.09%
0.00%
0.00%
0.00%
0.09%
0.00%


0.77%
0.38%
0.00%
7.41%
0.00%
16.67%
0.00%
0.00%
0.00%

1.01%
37.50%

0.16%
0.00%
0.00%
0.28%
0.12%


100.00%
0.24%
0.00%

0.00%
0.00%
0.00%

0.26%

0.20%
%GW
PWS
>MCL
0.18%
1 .06%

0.00%
0.40%
11.11%
0.00%
0.00%
0.00%
0.09%
0.00%


0.86%
0.00%
0.00%
4.55%
0.00%
16.67%
0.00%
0.00%
0.00%

1.18%
37.50%

0.16%
0.00%
0.00%
0.40%
0.13%


100.00%
0.25%
0.00%

0.00%
0.00%
0.00%

0.25%

0.20%
%sw
PWS
>MCL
0.00%
0.00%

0.84%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.85%
0.00%
20.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.26%

0.22%
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the

The Maximum Contaminant Level (MCL) for Dichloroethene is 7 ug/L
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.22.a URCIS (Round 1) Data- Dichloromethane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATE
TOTAL
UNIQUE
PWS
666
134
1
941
3,593
14
1
13
247
39
127
1,002
1,301
376
523
13
47
828
16
1,564
85
8
565
297

9
1,524
590
8
355
2,647
335
303
10
412
3
1
992
136
145

19,871

19,287
# GW
PWS
536
96

871
3,547
11

11
42
15
112
963
1,187
336
290
9
39
782
14
1,539
71
8
523
254

7
1,499
555
7
252
2,485
306
156
8
392

1
937
63
116

18,040

17,602
#SW
PWS
135
42
1
106
56
4
1
2
224
24
16
39
114
41
233
4
12
51
2
29
14

57
44

2
25
35
2
122
166
29
147
2
34
3

77
74
38

2,007

1,836
% PWS
>MRL
0.90%
13.43%
100.00%
0.96%
4.62%
42.86%
100.00%
7.69%
22.67%
0.00%
0.00%
0.20%
6.99%
8.24%
6.12%
0.00%
85.11%
6.16%
100.00%
1 .60%
0.00%
100.00%
0.88%
13.80%

100.00%
5.71 %
0.17%
0.00%
10.99%
3.25%
1.19%
9.24%
100.00%
3.16%
33.33%
100.00%
0.60%
5.15%
1 1 .03%

4.60%

4.05%
%GW
PWS
>MRL
0.93%
14.58%
0.00%
0.46%
4.14%
45.45%
0.00%
0.00%
14.29%
0.00%
0.00%
0.21 %
4.72%
8.04%
4.14%
0.00%
84.62%
4.99%
100.00%
1 .62%
0.00%
100.00%
0.96%
1 1 .02%

100.00%
5.60%
0.18%
0.00%
1 1 .51 %
3.22%
1 .31 %
8.33%
100.00%
2.55%
0.00%
100.00%
0.64%
4.76%
10.34%

3.81 %

3.31 %
%sw
PWS
>MRL
0.74%
1 1 .90%
100.00%
4.72%
37.50%
50.00%
100.00%
50.00%
22.77%
0.00%
0.00%
0.00%
30.70%
9.76%
8.58%
0.00%
91 .67%
23.53%
100.00%
0.00%
0.00%
0.00%
0.00%
29.55%

100.00%
12.00%
0.00%
0.00%
9.84%
3.61 %
0.00%
10.20%
100.00%
1 1 .76%
33.33%
0.00%
0.00%
5.41 %
10.53%

1 1 .86%

1 1 .06%
% PWS
>MCL
0.00%
2.99%
0.00%
0.64%
0.97%
0.00%
0.00%
0.00%
1 1 .74%
0.00%
0.00%
0.20%
0.69%
1 .60%
2.87%
0.00%
38.30%
1 .09%
12.50%
0.32%
0.00%
0.00%
0.35%
2.36%

88.89%
0.20%
0.00%
0.00%
1.13%
0.34%
0.00%
1 .32%
70.00%
0.24%
0.00%
0.00%
0.10%
0.00%
1 .38%

0.95%

0.77%
%GW
PWS
>MCL
0.00%
2.08%
0.00%
0.34%
0.96%
0.00%
0.00%
0.00%
7.14%
0.00%
0.00%
0.21 %
0.42%
1.19%
1 .38%
0.00%
38.46%
1.15%
14.29%
0.32%
0.00%
0.00%
0.38%
1 .57%

85.71 %
0.20%
0.00%
0.00%
1 .59%
0.32%
0.00%
0.00%
75.00%
0.26%
0.00%
0.00%
0.11%
0.00%
0.86%

0.69%

0.52%
%sw
PWS
>MCL
0.00%
4.76%
0.00%
2.83%
3.57%
0.00%
0.00%
0.00%
12.05%
0.00%
0.00%
0.00%
3.51 %
4.88%
4.72%
0.00%
33.33%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
6.82%

100.00%
0.00%
0.00%
0.00%
0.00%
0.60%
0.00%
2.72%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.63%

3.34%

3.27%
99%
VALUE
(M9/L)
< 0.00
5.60
1.70
< 10.00
2.00
3.00
1.80
< 1.20
40.00
< 0.50
< 0.20
< 5.00
2.40
3.00
3.00
< 0.50
42.00
2.00
58.00
0.50
< 2.00
2.30
< 1.00
7.70

499.00
1.26
< 1.00
< 0.20
2.00
< 1.50
< 0.50
2.60
29.00
0.50
2.00
1.80
< 0.50
0.60
3.30

5.00

5.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source
Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the
MCL; it does not necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the
average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Dichloromethane (Methylene Chloride) is 5 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.22.b  URCIS (Round 1) Data- Dichloromethane Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
666
134
1
941
3,593
14
1
13
247
39
127
1,002
1,301
376
523
13
47
828
16
1,564
85
8
565
297

9
1,524
590
8
355
2,647
335
303
10
412
3
1
992
136
145

19,871

19,287
TOTAL #
SAMPLES
1,635
368
3
2,952
12,036
37
62
334
369
50
1,221
1,910
5,274
2,234
2,040
22
115
1,729
19
2,749
328
8
1,624
644

10
3,173
1,595
148
2,162
15,934
444
1,220
14
1,261
10
1
3,987
654
313

68,689

65,416
#GW
SAMPLES
1,349
255

2,293
1 1 ,880
23

190
71
16
1,081
1,699
4,296
1,543
946
18
98
1,263
15
2,670
296
8
1,376
569

8
2,807
1,475
136
1,618
15,026
363
433
10
1,151

1
3,656
203
259

59,101

56,680
#SW
SAMPLES
286
113
3
659
156
14
62
144
298
34
140
211
978
691
1,094
4
17
466
4
79
32

248
75

2
366
120
12
544
908
81
787
4
110
10

331
451
54

9,588

8,736
% TOTAL
SAMPLES
>MRL
0.37%
6.52%
100.00%
0.44%
2.91%
32.43%
4.84%
0.30%
18.16%
0.00%
0.00%
0.10%
3.03%
4.34%
1 .96%
0.00%
84.35%
4.11%
100.00%
1 .05%
0.00%
100.00%
0.43%
10.40%

100.00%
3.47%
0.06%
0.00%
3.93%
0.78%
0.90%
3.11%
100.00%
1 .67%
10.00%
100.00%
0.28%
1 .22%
6.71 %

2.22%

1 .94%
%GW
SAMPLES
>MRL
0.37%
7.06%
0.00%
0.17%
2.72%
30.43%
0.00%
6.84%
0.00%
0.00%
0.00%
0.12%
2.28%
5.64%
1 .37%
0.00%
84.69%
3.56%
100.00%
1 .09%
0.00%
100.00%
0.51%
8.61 %

100.00%
3.81%
0.07%
0.00%
3.96%
0.79%
1.10%
4.39%
100.00%
1 .48%
0.00%
100.00%
0.30%
1 .48%
6.56%

2.01%

1 .72%
%SW
SAMPLES
>MRL
0.35%
5.31%
100.00%
1 .37%
17.31%
35.71%
4.84%
0.69%
18.12%
0.00%
0.00%
0.00%
6.34%
1 .45%
2.47%
0.00%
82.35%
5.58%
100.00%
0.00%
0.00%
0.00%
0.00%
24.00%

100.00%
0.82%
0.00%
0.00%
3.86%
0.66%
0.00%
2.41%
100.00%
3.64%
10.00%
0.00%
0.00%
1.11%
7.41 %

3.54%

3.22%
MIN VALUE
(M9/L)
< 0.00
< 0.50
0.7
< 0.01
< 0.00
< 0.00
< 0.00
< 0.40
< 0.00
< 0.00
< 0.00
< 0.10
< 0.07
< 0.11
< 0.50
< 0.50
< 0.00
< 0.10
1.00
< 0.50
< 0.20
0.50
< 0.50
< 0.13

0.12
< 0.00
< 0.00
< 0.20
< 0.03
< 0.02
< 0.15
< 0.02
3.00
< 0.10
< 1.00
1.80
< 0.50
< 0.50
< 0.10

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
5.60
1.7
< 10.00
2.00
3.00
1.80
< 1.20
40.00
< 0.50
< 0.20
< 5.00
2.40
3.00
3.00
< 0.50
42.00
2.00
58.00
0.50
< 2.00
2.30
< 1.00
7.70

499.00
1.26
< 1.00
< 0.20
2.00
< 1.50
< 0.50
2.60
29.00
0.50
2.00
1.80
< 0.50
0.60
3.30

1.70

1.30
MAX
VALUE
(M9/L)
4.50
19.70
1.7
55.00
620.00
3.00
1.80
4.60
226.00
< 0.50
< 0.50
24.00
170.00
31.40
49.00
< 0.50
110.00
20.00
58.00
65.00
< 2.00
2.30
21.80
31.00

499.00
9.53
4.00
< 0.20
155.10
24.70
0.15
7.20
29.00
72.00
2.00
1.80
29.90
4.00
6.20

620.00

620.00
MIN
DETECTS
(M9/L)
0.39
0.51
0.70
2.00
0.30
0.25
0.80
4.60
0.01

MEDIAN
DETECTS
(M9/L)
1.30
1.10
1.20
12.00
1.20
0.37
1.20
4.60
5.00


7.00
0.09
0.11
1.00

0.29
0.10
1.00
0.50

0.50
1.50
0.13

0.12
0.02
4.00

0.20
0.36
0.15
0.16
3.00
0.40
2.00
1.80
0.50
0.50
1.00

0.01

0.01
15.50
1.50
1.30
3.50

2.50
1.00
2.00
1.10

1.10
1.72
2.00

26.35
0.81
4.00

0.91
0.95
0.15
1.65
19.50
0.50
2.00
1.80
1.00
1.15
1.60

1.40

1.40
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.22.C URCIS (Round 1) Data- Dichloromethane Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,635
368
3
2,952
12,036
37
62
334
369
50
1,221
1,910
5,274
2,234
2,040
22
115
1,729
19
2,749
328
8
1,624
644

10
3,173
1,595
148
2,162
15,934
444
1,220
14
1,261
10
1
3,987
654
313

68,689

65,416
TOTAL
UNIQUE
PWS
666
134
1
941
3,593
14
1
13
247
39
127
1,002
1,301
376
523
13
47
828
16
1,564
85
8
565
297

9
1,524
590
8
355
2,647
335
303
10
412
3
1
992
136
145

19,871

19,287
#GW
PWS
536
96

871
3,547
11

11
42
15
112
963
1,187
336
290
9
39
782
14
1,539
71
8
523
254

7
1,499
555
7
252
2,485
306
156
8
392

1
937
63
116

18,040

17,602
#SW
PWS
135
42
1
106
56
4
1
2
224
24
16
39
114
41
233
4
12
51
2
29
14

57
44

2
25
35
2
122
166
29
147
2
34
3

77
74
38

2,007

1,836
% PWS
>MRL
0.90%
13.43%
100.00%
0.96%
4.62%
42.86%
100.00%
7.69%
22.67%
0.00%
0.00%
0.20%
6.99%
8.24%
6.12%
0.00%
85.11%
6.16%
100.00%
1.60%
0.00%
100.00%
0.88%
13.80%

100.00%
5.71%
0.17%
0.00%
10.99%
3.25%
1.19%
9.24%
100.00%
3.16%
33.33%
100.00%
0.60%
5.15%
11.03%

4.60%

4.05%
%GW
PWS
>MRL
0.93%
14.58%
0.00%
0.46%
4.14%
45.45%
0.00%
0.00%
14.29%
0.00%
0.00%
0.21 %
4.72%
8.04%
4.14%
0.00%
84.62%
4.99%
100.00%
1 .62%
0.00%
100.00%
0.96%
11.02%

100.00%
5.60%
0.18%
0.00%
11.51%
3.22%
1 .31 %
8.33%
100.00%
2.55%
0.00%
100.00%
0.64%
4.76%
10.34%

3.81 %

3.31 %
%sw
PWS
>MRL
0.74%
11.90%
100.00%
4.72%
37.50%
50.00%
100.00%
50.00%
22.77%
0.00%
0.00%
0.00%
30.70%
9.76%
8.58%
0.00%
91.67%
23.53%
100.00%
0.00%
0.00%
0.00%
0.00%
29.55%

100.00%
12.00%
0.00%
0.00%
9.84%
3.61%
0.00%
10.20%
100.00%
11.76%
33.33%
0.00%
0.00%
5.41%
10.53%

11.86%

11.06%
% PWS
> 1/2 MCL
0.30%
2.99%
0.00%
0.85%
1 .73%
7.14%
0.00%
7.69%
15.38%
0.00%
0.00%
0.20%
2.38%
3.46%
4.02%
0.00%
57.45%
1 .81 %
43.75%
0.51 %
0.00%
0.00%
0.35%
6.06%

88.89%
0.26%
0.17%
0.00%
3.38%
0.76%
0.00%
3.30%
100.00%
0.24%
0.00%
0.00%
0.20%
2.21 %
2.76%

1 .69%

1 .39%
%GW
PWS
> 1/2 MCL
0.19%
2.08%
0.00%
0.46%
1.64%
9.09%
0.00%
0.00%
7.14%
0.00%
0.00%
0.21%
1.43%
2.68%
1.72%
0.00%
58.97%
1.79%
42.86%
0.52%
0.00%
0.00%
0.38%
3.94%

85.71%
0.20%
0.18%
0.00%
3.57%
0.72%
0.00%
1.28%
100.00%
0.26%
0.00%
0.00%
0.21%
1.59%
2.59%

1.21%

0.94%
%sw
PWS
> 1/2 MCL
0.74%
4.76%
0.00%
3.77%
8.93%
0.00%
0.00%
50.00%
16.07%
0.00%
0.00%
0.00%
12.28%
9.76%
6.87%
0.00%
41 .67%
1 .96%
50.00%
0.00%
0.00%
0.00%
0.00%
18.18%

100.00%
4.00%
0.00%
0.00%
2.46%
1 .20%
0.00%
5.44%
100.00%
0.00%
0.00%
0.00%
0.00%
2.70%
2.63%

5.93%

5.72%
% PWS
>MCL
0.00%
2.99%
0.00%
0.64%
0.97%
0.00%
0.00%
0.00%
11.74%
0.00%
0.00%
0.20%
0.69%
1.60%
2.87%
0.00%
38.30%
1.09%
12.50%
0.32%
0.00%
0.00%
0.35%
2.36%

88.89%
0.20%
0.00%
0.00%
1.13%
0.34%
0.00%
1.32%
70.00%
0.24%
0.00%
0.00%
0.10%
0.00%
1.38%

0.95%

0.77%
%GW
PWS
>MCL
0.00%
2.08%
0.00%
0.34%
0.96%
0.00%
0.00%
0.00%
7.14%
0.00%
0.00%
0.21 %
0.42%
1.19%
1 .38%
0.00%
38.46%
1.15%
14.29%
0.32%
0.00%
0.00%
0.38%
1 .57%

85.71 %
0.20%
0.00%
0.00%
1 .59%
0.32%
0.00%
0.00%
75.00%
0.26%
0.00%
0.00%
0.11%
0.00%
0.86%

0.69%

0.52%
%sw
PWS
>MCL
0.00%
4.76%
0.00%
2.83%
3.57%
0.00%
0.00%
0.00%
12.05%
0.00%
0.00%
0.00%
3.51%
4.88%
4.72%
0.00%
33.33%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
6.82%

100.00%
0.00%
0.00%
0.00%
0.00%
0.60%
0.00%
2.72%
50.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.63%

3.34%

3.27%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the

The Maximum Contaminant Level (MCL) for Dichloromethane (Methylene Chloride) is 5 ug/L
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.23.a URCIS (Round 1) Data-  1,2-Dichloropropane Occurrence in Public Water Systerr
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATE
TOTAL
UNIQUE
PWS
661
132

943
3,538
9
1
13
224
1,161
127
1,002
1,299
369
524
13
4
844

1,565
85
2
565
297
2

1,517
590
8
355
2,656

303


3
1
992
137
145

20,087

19,591
# GW
PWS
532
94

873
3,507
7

11
41
1,052
112
963
1,185
331
291
9
3
798

1,540
71
2
523
254
2

1,492
555
7
252
2,493

156



1
937
63
116

18,273

17,908
#SW
PWS
134
42

106
39
3
1
2
204
109
16
39
114
39
233
4
1
51

29
14

57
44


25
35
2
122
167

147


3

77
75
38

1,972

1,820
% PWS
>MRL
0.15%
2.27%

0.11%
1 .67%
0.00%
0.00%
7.69%
4.46%
0.09%
0.00%
0.10%
0.54%
0.27%
0.19%
0.00%
50.00%
0.71%

0.38%
0.00%
100.00%
0.00%
4.38%
100.00%

0.73%
0.00%
0.00%
0.00%
0.04%

0.00%


0.00%
100.00%
0.50%
0.73%
2.76%

0.70%

0.67%
%GW
PWS
>MRL
0.19%
3.19%

0.11%
1 .68%
0.00%
0.00%
9.09%
2.44%
0.10%
0.00%
0.10%
0.51%
0.30%
0.34%
0.00%
33.33%
0.63%

0.39%
0.00%
100.00%
0.00%
5.12%
100.00%

0.67%
0.00%
0.00%
0.00%
0.04%

0.00%


0.00%
100.00%
0.53%
1 .59%
1 .72%

0.68%

0.66%
%sw
PWS
>MRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
4.41%
0.00%
0.00%
0.00%
0.88%
0.00%
0.00%
0.00%
100.00%
1 .96%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

4.00%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
5.26%

0.76%

0.77%
% PWS
>MCL
0.00%
0.00%

0.00%
0.23%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.12%

0.00%
0.00%
0.00%
0.00%
1 .68%
0.00%

0.07%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.10%
0.00%
0.00%

0.08%

0.08%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.23%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.13%

0.00%
0.00%
0.00%
0.00%
1 .97%
0.00%

0.07%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.11%
0.00%
0.00%

0.09%

0.09%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
99%
VALUE
(M9/L)
< 0.00
0.80

< 5.00
1.00
< 5.00
< 0.50
< 0.50
1.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50
4.70
< 1.00

< 0.20
< 2.00
2.60
< 1.00
4.80
0.90

< 1.00
< 1.00
< 0.20
< 1.00
< 1.00

< 0.50


< 0.00
0.70
< 0.00
< 0.00
0.70

< 4.00

< 4.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source
Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the
MCL; it does not necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the
average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for 1,2-Dichloropropane is 5 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.23.b URCIS (Round 1) Data- 1,2-Dichloropropane Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
661
132

943
3,538
9
1
13
224
1,161
127
1,002
1,299
369
524
13
4
844

1,565
85
2
565
297
2

1,517
590
8
355
2,656

303


3
1
992
137
145

20,087

19,591
TOTAL #
SAMPLES
1,609
353

2,969
12,263
33
62
333
322
2,459
1,221
1,908
5,271
2,213
2,312
22
5
1,784

2,755
328
4
1,624
644
4

3,161
1,595
148
2,166
16,085

1,220


10
1
3,987
657
313

69,841

66,725
#GW
SAMPLES
1,323
246

2,308
12,159
30

189
68
1,861
1,081
1,697
4,266
1,528
1,172
18
3
1,305

2,676
296
4
1,376
569
4

2,796
1,475
136
1,620
15,166

433



1
3,656
204
259

59,925

57,624
#SW
SAMPLES
286
107

661
104
3
62
144
254
598
140
211
1,005
685
1,140
4
2
479

79
32

248
75


365
120
12
546
919

787


10

331
453
54

9,916

9,101
% TOTAL
SAMPLES
>MRL
0.06%
1.13%

0.03%
1 .96%
0.00%
0.00%
0.90%
3.42%
0.08%
0.00%
0.05%
0.17%
0.09%
0.17%
0.00%
40.00%
0.62%

0.22%
0.00%
100.00%
0.00%
2.33%
100.00%

0.44%
0.00%
0.00%
0.00%
0.01%

0.00%


0.00%
100.00%
0.30%
0.15%
1 .92%

0.51 %

0.51%
%GW
SAMPLES
>MRL
0.08%
1 .63%

0.04%
1 .97%
0.00%
0.00%
1 .59%
2.94%
0.11%
0.00%
0.06%
0.19%
0.13%
0.34%
0.00%
33.33%
0.77%

0.22%
0.00%
100.00%
0.00%
2.64%
100.00%

0.46%
0.00%
0.00%
0.00%
0.01%

0.00%


0.00%
100.00%
0.33%
0.49%
1 .54%

0.57%

0.57%
%SW
SAMPLES
>MRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
3.54%
0.00%
0.00%
0.00%
0.10%
0.00%
0.00%
0.00%
50.00%
0.21%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.27%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
3.70%

0.15%

0.15%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.04
< 0.50
< 0.20
< 0.00
< 0.50
< 0.00
< 0.50
< 0.07
< 0.08
< 0.50
< 0.50
< 1.00
< 0.10

< 0.20
< 0.20
1.10
< 0.50
< 0.50
0.20

< 0.00
< 0.00
< 0.20
< 0.08
< 0.20

< 0.01


< 1.00
0.70
< 0.50
< 0.10
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
0.80

< 5.00
1.00
< 5.00
< 0.50
< 0.50
1.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50
4.70
< 1.00

< 0.20
< 2.00
2.60
< 1.00
4.80
0.90

< 1.00
< 1.00
< 0.20
< 1.00
< 1.00

< 0.50


< 0.00
0.70
< 0.00
< 0.00
0.70

< 4.00

< 4.00
MAX
VALUE
(M9/L)
2.60
1.70

2.00
53.00
< 5.00
< 0.50
0.40
2.00
1.10
< 1.00
0.50
3.00
2.50
1.00
< 0.50
4.70
37.00

2.60
< 2.00
2.60
< 1.00
24.00
0.90

6.30
< 5.00
< 0.20
< 10.00
1.70

< 0.50


< 1.00
0.70
10.10
1.00
2.30

53.00

53.00
MIN
DETECTS
(M9/L)
2.60
0.80

2.00
0.10


0.20
0.01
0.70

0.50
0.07
2.50
1.00

1.40
0.20

0.20

1.10

0.76
0.20

0.21



1.30





0.70
0.70
1.00
0.20
MEDIAN
DETECTS
(M9/L)
2.60
1.25

2.00
1.00


0.30
0.40
0.90

0.50
0.50
2.50
1.00

3.05
1.30

0.50

1.40

3.20
0.30

1.00



1.50





0.70
1.20
1.00
0.80

0.01

0.01
1.00

1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.23.C URCIS (Round 1) Data-1,2-Dichloropropane Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,609
353

2,969
12,263
33
62
333
322
2,459
1,221
1,908
5,271
2,213
2,312
22
5
1,784

2,755
328
4
1,624
644
4

3,161
1,595
148
2,166
16,085

1,220


10
1
3,987
657
313

69,841

66,725
TOTAL
UNIQUE
PWS
661
132

943
3,538
9
1
13
224
1,161
127
1,002
1,299
369
524
13
4
844

1,565
85
2
565
297
2

1,517
590
8
355
2,656

303


3
1
992
137
145

20,087

19,591
#GW
PWS
532
94

873
3,507
7

11
41
1,052
112
963
1,185
331
291
9
3
798

1,540
71
2
523
254
2

1,492
555
7
252
2,493

156



1
937
63
116

18,273

17,908
#SW
PWS
134
42

106
39
3
1
2
204
109
16
39
114
39
233
4
1
51

29
14

57
44


25
35
2
122
167

147


3

77
75
38

1,972

1,820
% PWS
>MRL
0.15%
2.27%

0.11%
1.67%
0.00%
0.00%
7.69%
4.46%
0.09%
0.00%
0.10%
0.54%
0.27%
0.19%
0.00%
50.00%
0.71%

0.38%
0.00%
100.00%
0.00%
4.38%
100.00%

0.73%
0.00%
0.00%
0.00%
0.04%

0.00%


0.00%
100.00%
0.50%
0.73%
2.76%

0.70%

0.67%
%GW
PWS
>MRL
0.19%
3.19%

0.11%
1 .68%
0.00%
0.00%
9.09%
2.44%
0.10%
0.00%
0.10%
0.51 %
0.30%
0.34%
0.00%
33.33%
0.63%

0.39%
0.00%
100.00%
0.00%
5.12%
100.00%

0.67%
0.00%
0.00%
0.00%
0.04%

0.00%


0.00%
100.00%
0.53%
1 .59%
1 .72%

0.68%

0.66%
%sw
PWS
>MRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
4.41%
0.00%
0.00%
0.00%
0.88%
0.00%
0.00%
0.00%
100.00%
1.96%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

4.00%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
5.26%

0.76%

0.77%
% PWS
> 1/2 MCL
0.15%
0.00%

0.00%
0.51 %
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.08%
0.00%
0.00%
0.00%
25.00%
0.12%

0.06%
0.00%
50.00%
0.00%
2.69%
0.00%

0.07%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.10%
0.00%
0.00%

0.17%

0.16%
%GW
PWS
> 1/2 MCL
0.19%
0.00%

0.00%
0.51%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.08%
0.00%
0.00%
0.00%
33.33%
0.13%

0.06%
0.00%
50.00%
0.00%
3.15%
0.00%

0.07%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.11%
0.00%
0.00%

0.19%

0.18%
%sw
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>MCL
0.00%
0.00%

0.00%
0.23%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.12%

0.00%
0.00%
0.00%
0.00%
1.68%
0.00%

0.07%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.10%
0.00%
0.00%

0.08%

0.08%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.23%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.13%

0.00%
0.00%
0.00%
0.00%
1 .97%
0.00%

0.07%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.11%
0.00%
0.00%

0.09%

0.09%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the

The Maximum Contaminant Level (MCL) for 1,2-Dichloropropane is 5 ug/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.24.a URCIS (Round 1) Data- 1,3-Dichloropropane Occurrence in Public Water Systerr
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATE
TOTAL
UNIQUE
PWS
659
131

941
148
9
1
13
114
1,162
127
1,002
1,302
365
524
13

982

1,553
85

565
297


1,503
590
8
355
2,653
335
303

420
3
1
992
134
145

17,435

16,947
# GW
PWS
530
93

872
134
7

11
34
1,053
112
963
1,187
327
291
9

935

1,529
71

523
254


1,478
555
7
252
2,491
306
156

400

1
937
62
116

15,696

15,338
#SW
PWS
134
42

105
20
3
1
2
93
109
16
39
115
39
233
4

50

28
14

57
44


25
35
2
122
166
29
147

34
3

77
73
38

1,899

1,748
% PWS
>MRL
0.15%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.88%
0.00%
0.00%
0.00%
0.31%
0.00%
0.19%
7.69%

0.10%

0.00%
1.18%

0.18%
0.34%


0.40%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.95%
0.00%
100.00%
0.00%
0.00%
0.00%

0.13%

0.12%
%GW
PWS
>MRL
0.19%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.34%
0.00%
0.00%
11.11%

0.11%

0.00%
1.41%

0.19%
0.39%


0.41%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

1 .00%
0.00%
100.00%
0.00%
0.00%
0.00%

0.13%

0.12%
%sw
PWS
>MRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
1 .08%
0.00%
0.00%
0.00%
0.00%
0.00%
0.43%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.11%

0.11%
% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference
Level (HRL), Maximum
Contaminant Level (MCL), or
Health Advisory Level (HAL) for
1 ,3-Dichloropropane.




























































99%
VALUE
(M9/L)
< 0.00
< 0.50

< 5.00
< 0.50
< 5.00
< 0.50
< 0.50
< 0.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
3.00

< 0.50

< 0.20
< 2.00

< 1.00
< 0.50


< 1.00
< 1.00
< 0.20
< 1.00
< 1.00
< 0.50
< 0.50

< 2.50
< 1.00
0.50
< 0.50
< 4.00
< 0.60

< 1.00

< 1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source
Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.24.b URCIS (Round 1) Data- 1,3-Dichloropropane Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
659
131

941
148
9
1
13
114
1,162
127
1,002
1,302
365
524
13

982

1,553
85

565
297


1,503
590
8
355
2,653
335
303

420
3
1
992
134
145

17,435

16,947
TOTAL #
SAMPLES
1,600
351

2,879
1,063
32
62
333
159
2,461
1,221
1,909
6,001
1,933
2,076
22

1,754

2,656
323

1,624
644


3,142
1,595
148
2,158
15,951
444
1,220

1,310
10
1
3,987
371
313

59,753

56,664
#GW
SAMPLES
1,314
244

2,238
1,010
29

189
51
1,863
1,081
1,697
5,034
1,512
1,119
18

1,380

2,588
297

1,376
569


2,783
1,475
136
1,614
15,034
363
433

1,199

1
3,656
148
259

50,710

48,426
#SW
SAMPLES
286
107

641
53
3
62
144
108
598
140
212
967
421
957
4

374

68
26

248
75


359
120
12
544
917
81
787

111
10

331
223
54

9,043

8,238
% TOTAL
SAMPLES
>MRL
0.06%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.63%
0.00%
0.00%
0.00%
0.10%
0.00%
0.05%
4.55%

0.06%

0.00%
0.31 %

0.06%
0.16%


0.29%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.61%
0.00%
100.00%
0.00%
0.00%
0.00%

0.05%

0.05%
%GW
SAMPLES
>MRL
0.08%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.12%
0.00%
0.00%
5.56%

0.07%

0.00%
0.34%

0.07%
0.18%


0.32%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.67%
0.00%
100.00%
0.00%
0.00%
0.00%

0.06%

0.06%
%SW
SAMPLES
>MRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.93%
0.00%
0.00%
0.00%
0.00%
0.00%
0.10%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.02%

0.02%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.10
< 0.00
< 0.04
< 0.50
< 0.20
< 0.00
< 0.50
< 0.00
< 0.20
< 0.07
< 0.06
< 0.50
< 0.50

< 0.10

< 0.20
< 0.20

< 0.50
< 0.50


< 0.00
< 0.00
< 0.20
< 0.14
< 0.00
< 0.50
< 0.03

< 0.00
< 1.00
0.50
< 0.50
< 0.10
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
< 0.50

< 5.00
< 0.50
< 5.00
< 0.50
< 0.50
< 0.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
3.00

< 0.50

< 0.20
< 2.00

< 1.00
< 0.50


< 1.00
< 1.00
< 0.20
< 1.00
< 1.00
< 0.50
< 0.50

< 2.50
< 1.00
0.50
< 0.50
< 4.00
< 0.60

< 1.00

< 1.00
MAX
VALUE
(M9/L)
0.00
< 0.80

< 10.00
< 0.50
< 5.00
< 0.50
< 0.50
1.00
< 0.50
< 1.00
< 1.00
0.60
< 5.00
3.30
3.00

0.10

< 2.00
1.00

2.00
0.90


3.30
< 5.00
< 0.20
< 10.00
< 5.00
< 0.50
< 0.50

0.50
< 1.00
0.50
< 0.50
< 5.00
< 1.00

3.30

3.30
MIN
DETECTS
(M9/L)
0.80







1.00



0.07

3.30
3.00

0.10


1.00

2.00
0.90


0.21







0.10

0.50




0.07

0.07
MEDIAN
DETECTS
(M9/L)
0.80







1.00



0.29

3.30
3.00

0.10


1.00

2.00
0.90


0.65







0.10

0.50




0.50

0.50
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.24.C  URCIS (Round 1) Data-1,3-Dichloropropane Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,600
351

2,879
1,063
32
62
333
159
2,461
1,221
1,909
6,001
1,933
2,076
22

1,754

2,656
323

1,624
644


3,142
1,595
148
2,158
15,951
444
1,220

1,310
10
1
3,987
371
313

59,753

56,664
TOTAL
UNIQUE
PWS
659
131

941
148
9
1
13
114
1,162
127
1,002
1,302
365
524
13

982

1,553
85

565
297


1,503
590
8
355
2,653
335
303

420
3
1
992
134
145

17,435

16,947
#GW
PWS
530
93

872
134
7

11
34
1,053
112
963
1,187
327
291
9

935

1,529
71

523
254


1,478
555
7
252
2,491
306
156

400

1
937
62
116

15,696

15,338
#SW
PWS
134
42

105
20
3
1
2
93
109
16
39
115
39
233
4

50

28
14

57
44


25
35
2
122
166
29
147

34
3

77
73
38

1,899

1,748
% PWS
>MRL
0.15%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.88%
0.00%
0.00%
0.00%
0.31%
0.00%
0.19%
7.69%

0.10%

0.00%
1.18%

0.18%
0.34%


0.40%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.95%
0.00%
100.00%
0.00%
0.00%
0.00%

0.13%

0.12%
%GW
PWS
>MRL
0.19%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.34%
0.00%
0.00%
11.11%

0.11%

0.00%
1.41%

0.19%
0.39%


0.41%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

1 .00%
0.00%
100.00%
0.00%
0.00%
0.00%

0.13%

0.12%
%sw
PWS
>MRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
1.08%
0.00%
0.00%
0.00%
0.00%
0.00%
0.43%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.11%

0.11%
% PWS
>1/2MCL

















%GW
PWS
> 1/2 MCL

















%SW
PWS
> 1/2 MCL

















% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level (HRL), Maximum
Contaminant Level (MCL), or Health Advisory Level (HAL) for
1 ,3-Dichloropropane.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.25.a URCIS (Round 1) Data- 2,2-Dichloropropane Occurrence in Public Water Systerr
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATE
TOTAL
UNIQUE
PWS
660
131

941
147
9
1
13
119
1,162
127
805
1,302
366
524
13

983

1,553
85

565
297
1

1,504
590
8
349
2,652
335
303

417
3
1
992
137
145

17,240

16,757
# GW
PWS
531
93

872
134
7
0
11
33
1,053
112
766
1,187
328
291
9

936

1,529
71

523
254
1

1,479
555
7
246
2,487
306
156

397

1
937
63
116

15,491

15,138
#SW
PWS
134
42

105
19
3
1
2
98
109
16
39
115
39
233
4

50

28
14

57
44
0

25
35
2
122
166
29
147

34
3
0
77
75
38

1,905

1,754
% PWS
>MRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
7.69%
1 .68%
0.00%
0.79%
0.00%
0.31%
0.27%
0.00%
0.00%

0.10%

0.00%
0.00%

0.00%
1.01%
100.00%

0.20%
0.00%
0.00%
0.57%
0.11%
0.00%
0.00%

1 .68%
0.00%
100.00%
0.00%
0.00%
0.00%

0.17%

0.15%
%GW
PWS
>MRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
9.09%
3.03%
0.00%
0.89%
0.00%
0.34%
0.30%
0.00%
0.00%

0.11%

0.00%
0.00%

0.00%
1.18%
100.00%

0.20%
0.00%
0.00%
0.41%
0.08%
0.00%
0.00%

1 .26%
0.00%
100.00%
0.00%
0.00%
0.00%

0.16%

0.14%
%sw
PWS
>MRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
1 .02%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.82%
0.60%
0.00%
0.00%

5.88%
0.00%
0.00%
0.00%
0.00%
0.00%

0.26%

0.23%
% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference
Level (HRL), Maximum
Contaminant Level (MCL), or
Health Advisory Level (HAL) for
2,2-Dichloropropane.




























































99%
VALUE
(M9/L)
< 0.00
< 0.50

< 5.00
< 0.50
< 5.00
< 0.50
< 0.50
1.00
< 0.50
< 0.50
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00

< 1.00
< 0.50
1.40

< 1.00
< 1.00
< 0.20
< 1.00
< 1.00
< 0.50
< 0.50

< 5.00
< 1.00
3.60
< 0.50
< 4.00
< 0.60

< 2.00

< 2.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source
Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.25.b URCIS (Round 1) Data- 2,2-Dichloropropane Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
660
131

941
147
9
1
13
119
1,162
127
805
1,302
366
524
13

983

1,553
85

565
297
1

1,504
590
8
349
2,652
335
303

417
3
1
992
137
145

17,240

16,757
TOTAL #
SAMPLES
1,602
351

2,877
1,063
33
62
333
161
2,462
1,221
1,211
6,000
1,932
2,311
22

1,755

2,657
323

1,624
644
1

3,150
1,595
148
2,113
15,788
444
1,220

1,306
10
1
3,987
390
313

59,110

56,064
#GW
SAMPLES
1,316
244

2,237
1,011
30
0
189
50
1,864
1,081
1,035
5,034
1,511
1,172
18

1,381

2,589
297

1,376
569
1

2,785
1,475
136
1,571
14,925
363
433

1,195
0
1
3,656
164
259

49,968

47,725
#SW
SAMPLES
286
107

640
52
3
62
144
111
598
140
176
966
421
1,139
4

374

68
26

248
75
0

365
120
12
542
863
81
787

111
10
0
331
226
54

9,142

8,339
% TOTAL
SAMPLES
>MRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.60%
1 .24%
0.00%
0.08%
0.00%
0.10%
0.26%
0.00%
0.00%

0.06%

0.00%
0.00%

0.00%
0.78%
100.00%

0.13%
0.00%
0.00%
0.24%
0.02%
0.00%
0.00%

0.84%
0.00%
100.00%
0.00%
0.00%
0.00%

0.08%

0.07%
%GW
SAMPLES
>MRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
1 .06%
2.00%
0.00%
0.09%
0.00%
0.12%
0.33%
0.00%
0.00%

0.07%

0.00%
0.00%

0.00%
0.88%
100.00%

0.14%
0.00%
0.00%
0.06%
0.01%
0.00%
0.00%

0.75%
0.00%
100.00%
0.00%
0.00%
0.00%

0.08%

0.07%
%SW
SAMPLES
>MRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.90%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.74%
0.12%
0.00%
0.00%

1 .80%
0.00%
0.00%
0.00%
0.00%
0.00%

0.09%

0.05%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.20
< 0.00
< 0.19
< 0.50
< 0.20
< 0.00
< 0.50
< 0.00
< 0.20
< 0.10
< 0.05
< 0.50
< 0.50

< 0.20

< 0.20
< 0.20

< 0.50
< 0.50
1.40

< 0.00
< 0.00
< 0.20
< 0.10
< 0.00
< 0.50
< 0.05

< 0.10
< 1.00
3.60
< 0.50
< 0.10
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
< 0.50

< 5.00
< 0.50
< 5.00
< 0.50
< 0.50
1.00
< 0.50
< 0.50
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00

< 1.00
< 0.50
1.40

< 1.00
< 1.00
< 0.20
< 1.00
< 1.00
< 0.50
< 0.50

< 5.00
< 1.00
3.60
< 0.50
< 4.00
< 0.60

< 2.00

< 2.00
MAX
VALUE
(M9/L)
< 0.00
< 0.50

< 30.00
< 0.50
< 5.00
< 0.50
2.10
24.00
< 0.50
0.30
< 1.00
61.00
8.64
< 1.00
< 0.50

5.10

< 5.00
< 2.00

< 1.00
4.40
1.40

1.10
< 5.00
< 0.20
78.00
10.50
< 0.50
< 0.50

1.00
< 1.00
3.60
< 0.50
< 5.00
< 1.00

78.00

61.00
MIN
DETECTS
(M9/L)







0.50
1.00

0.30

0.17
0.66



5.10





0.64
1.40

0.40


0.70
0.77



0.50

3.60




0.17

0.17
MEDIAN
DETECTS
(M9/L)







1.30
12.50

0.30

0.34
1.25



5.10





1.60
1.40

0.90


1.00
1.30



0.50

3.60




0.77

0.76
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.25.C  URCIS (Round 1) Data- 2,2-Dichloropropane Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,602
351

2,877
1,063
33
62
333
161
2,462
1,221
1,211
6,000
1,932
2,311
22

1,755

2,657
323

1,624
644
1

3,150
1,595
148
2,113
15,788
444
1,220

1,306
10
1
3,987
390
313

59,110

56,064
TOTAL
UNIQUE
PWS
660
131

941
147
9
1
13
119
1,162
127
805
1,302
366
524
13

983

1,553
85

565
297
1

1,504
590
8
349
2,652
335
303

417
3
1
992
137
145

17,240

16,757
#GW
PWS
531
93

872
134
7
0
11
33
1,053
112
766
1,187
328
291
9

936

1,529
71

523
254
1

1,479
555
7
246
2,487
306
156

397
0
1
937
63
116

15,491

15,138
#SW
PWS
134
42

105
19
3
1
2
98
109
16
39
115
39
233
4

50

28
14

57
44
0

25
35
2
122
166
29
147

34
3
0
77
75
38

1,905

1,754
% PWS
>MRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
7.69%
1.68%
0.00%
0.79%
0.00%
0.31%
0.27%
0.00%
0.00%

0.10%

0.00%
0.00%

0.00%
1 .01 %
100.00%

0.20%
0.00%
0.00%
0.57%
0.11%
0.00%
0.00%

1 .68%
0.00%
100.00%
0.00%
0.00%
0.00%

0.17%

0.15%
%GW
PWS
>MRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
9.09%
3.03%
0.00%
0.89%
0.00%
0.34%
0.30%
0.00%
0.00%

0.11%

0.00%
0.00%

0.00%
1.18%
100.00%

0.20%
0.00%
0.00%
0.41%
0.08%
0.00%
0.00%

1 .26%
0.00%
100.00%
0.00%
0.00%
0.00%

0.16%

0.14%
%SW
PWS
>MRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
1.02%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.82%
0.60%
0.00%
0.00%

5.88%
0.00%
0.00%
0.00%
0.00%
0.00%

0.26%

0.23%
% PWS
>1/2MCL

















%GW
PWS
> 1/2 MCL

















%SW
PWS
> 1/2 MCL

















% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level (HRL), Maximum
Contaminant Level (MCL), or Health Advisory Level (HAL) for
2,2-Dichloropropane.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.26.a URCIS (Round 1) Data- 1,1-Dichloropropene Occurrence in Public Water Systerr
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATE
TOTAL
UNIQUE
PWS
660
131

941
149
9
1
13
117
1,162
127
1,002
1,302
363
524
13
1
983

1,565
85
1
565
297


1,504
590
8
344
2,634
335
303

419
3
1
992
137
145

17,426

16,947
# GW
PWS
531
93

872
134
7
0
11
33
1,053
112
963
1,187
326
291
9
1
936

1,540
71
1
523
254


1,479
555
7
242
2,473
306
156

399
0
1
937
63
116

15,682

15,332
#SW
PWS
134
42

105
21
3
1
2
95
109
16
39
115
38
233
4
0
50

29
14
0
57
44


25
35
2
121
162
29
147

34
3
0
77
75
38

1,899

1,749
% PWS
>MRL
0.00%
6.11%

0.00%
0.00%
0.00%
0.00%
0.00%
1.71%
0.00%
0.00%
0.00%
0.23%
0.00%
0.00%
0.00%
100.00%
0.10%

0.06%
0.00%
100.00%
0.00%
0.34%


0.07%
0.00%
0.00%
0.29%
0.04%
0.00%
0.00%

0.95%
0.00%
100.00%
0.00%
0.00%
0.00%

0.15%

0.13%
%GW
PWS
>MRL
0.00%
5.38%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.25%
0.00%
0.00%
0.00%
100.00%
0.00%

0.06%
0.00%
100.00%
0.00%
0.39%


0.07%
0.00%
0.00%
0.00%
0.04%
0.00%
0.00%

0.75%
0.00%
100.00%
0.00%
0.00%
0.00%

0.11%

0.10%
%sw
PWS
>MRL
0.00%
7.14%

0.00%
0.00%
0.00%
0.00%
0.00%
2.11%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.83%
0.00%
0.00%
0.00%

2.94%
0.00%
0.00%
0.00%
0.00%
0.00%

0.42%

0.40%
% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference
Level (HRL), Maximum
Contaminant Level (MCL), or
Health Advisory Level (HAL) for
1,1-Dichloropropene.




























































99%
VALUE
(M9/L)
< 0.00
3.40

< 1.00
< 0.50
< 5.00
< 0.50
< 0.50
1.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50
0.90
< 0.50

< 0.20
< 2.00
0.50
< 1.00
< 0.50


< 1.08
< 1.00
< 0.20
< 1.00
< 1.00
< 0.50
< 0.50

< 2.50
< 1.00
0.50
< 0.50
< 4.00
< 2.00

< 1.00

< 1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source
Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.26.b URCIS (Round 1) Data- 1,1-Dichloropropene Occurrence in Public Water Systems - Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
660
131

941
149
9
1
13
117
1,162
127
1,002
1,302
363
524
13
1
983

1,565
85
1
565
297


1,504
590
8
344
2,634
335
303

419
3
1
992
137
145

17,426

16,947
TOTAL #
SAMPLES
1,602
351

2,886
1,065
30
62
333
159
2,462
1,221
1,909
6,002
1,920
2,076
22
7
1,755

2,757
321
1
1,624
644


3,149
1,595
148
2,095
15,512
444
1,220

1,318
9
1
3,987
390
313

59,390

56,361
#GW
SAMPLES
1,316
244

2,245
1,010
27
0
189
51
1,863
1,081
1,697
5,035
1,507
1,119
18
7
1,381

2,678
295
1
1,376
569


2,784
1,475
136
1,552
14,707
363
433

1,206
0
1
3,656
164
259

50,445

48,219
#SW
SAMPLES
286
107

641
55
3
62
144
108
599
140
212
967
413
957
4
0
374

79
26
0
248
75


365
120
12
543
805
81
787

112
9
0
331
226
54

8,945

8,142
% TOTAL
SAMPLES
>MRL
0.00%
3.13%

0.00%
0.00%
0.00%
0.00%
0.00%
1 .26%
0.00%
0.00%
0.00%
0.08%
0.00%
0.00%
0.00%
100.00%
0.06%

0.04%
0.00%
100.00%
0.00%
0.16%


0.03%
0.00%
0.00%
0.10%
0.01%
0.00%
0.00%

0.61%
0.00%
100.00%
0.00%
0.00%
0.00%

0.07%

0.06%
%GW
SAMPLES
>MRL
0.00%
3.28%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.10%
0.00%
0.00%
0.00%
100.00%
0.00%

0.04%
0.00%
100.00%
0.00%
0.18%


0.04%
0.00%
0.00%
0.00%
0.01%
0.00%
0.00%

0.58%
0.00%
100.00%
0.00%
0.00%
0.00%

0.07%

0.05%
%sw
SAMPLES
>MRL
0.00%
2.80%

0.00%
0.00%
0.00%
0.00%
0.00%
1 .85%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.27%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.37%
0.00%
0.00%
0.00%

0.89%
0.00%
0.00%
0.00%
0.00%
0.00%

0.10%

0.09%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.10
< 0.00
< 0.08
< 0.50
< 0.20
< 0.00
< 0.50
< 0.00
< 0.20
< 0.04
< 0.06
< 0.50
< 0.50
0.50
< 0.20

< 0.20
< 0.20
0.50
< 0.50
< 0.50


< 0.00
< 0.00
< 0.20
< 0.10
< 0.20
< 0.50
< 0.02

< 0.10
< 1.00
0.50
< 0.50
< 0.20
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
3.40

< 1.00
< 0.50
< 5.00
< 0.50
< 0.50
1.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50
0.90
< 0.50

< 0.20
< 2.00
0.50
< 1.00
< 0.50


< 1.08
< 1.00
< 0.20
< 1.00
< 1.00
< 0.50
< 0.50

< 2.50
< 1.00
0.50
< 0.50
< 4.00
< 2.00

< 1.00

< 1.00
MAX
VALUE
(M9/L)
< 0.00
16.90

< 10.00
< 0.50
< 5.00
< 0.50
< 0.50
1.00
< 0.50
< 0.30
< 1.00
0.50
< 5.00
< 1.00
< 0.50
0.90
5.00

0.20
< 0.00
0.50
< 0.00
8.00


1.00
< 5.00
< 0.20
0.80
1.00
< 0.50
< 0.50

1.00
< 1.00
0.50
< 0.50
< 4.00
< 2.00

16.90

16.90
MIN
DETECTS
(M9/L)

0.50






1.00



0.04



0.50
5.00

0.20

0.50

8.00


1.00


0.80
1.00



0.10

0.50




0.04

0.04
MEDIAN
DETECTS
(M9/L)

1.60






1.00



0.24



0.70
5.00

0.20

0.50

8.00


1.00


0.80
1.00



0.10

0.50




0.70

0.80
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.26.C  URCIS (Round 1) Data- 1,1-Dichloropropene Occurrence in Public Water Systems - Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,602
351

2,886
1,065
30
62
333
159
2,462
1,221
1,909
6,002
1,920
2,076
22
7
1,755

2,757
321
1
1,624
644


3,149
1,595
148
2,095
15,512
444
1,220

1,318
9
1
3,987
390
313

59,390

56,361
TOTAL
UNIQUE
PWS
660
131

941
149
9
1
13
117
1,162
127
1,002
1,302
363
524
13
1
983

1,565
85
1
565
297


1,504
590
8
344
2,634
335
303

419
3
1
992
137
145

17,426

16,947
#GW
PWS
531
93

872
134
7
0
11
33
1,053
112
963
1,187
326
291
9
1
936

1,540
71
1
523
254


1,479
555
7
242
2,473
306
156

399
0
1
937
63
116

15,682

15,332
#SW
PWS
134
42

105
21
3
1
2
95
109
16
39
115
38
233
4
0
50

29
14
0
57
44


25
35
2
121
162
29
147

34
3
0
77
75
38

1,899

1,749
% PWS
>MRL
0.00%
6.11%

0.00%
0.00%
0.00%
0.00%
0.00%
1.71%
0.00%
0.00%
0.00%
0.23%
0.00%
0.00%
0.00%
100.00%
0.10%

0.06%
0.00%
100.00%
0.00%
0.34%


0.07%
0.00%
0.00%
0.29%
0.04%
0.00%
0.00%

0.95%
0.00%
100.00%
0.00%
0.00%
0.00%

0.15%

0.13%
%GW
PWS
>MRL
0.00%
5.38%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.25%
0.00%
0.00%
0.00%
100.00%
0.00%

0.06%
0.00%
100.00%
0.00%
0.39%


0.07%
0.00%
0.00%
0.00%
0.04%
0.00%
0.00%

0.75%
0.00%
100.00%
0.00%
0.00%
0.00%

0.11%

0.10%
%sw
PWS
>MRL
0.00%
7.14%

0.00%
0.00%
0.00%
0.00%
0.00%
2.11%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.83%
0.00%
0.00%
0.00%

2.94%
0.00%
0.00%
0.00%
0.00%
0.00%

0.42%

0.40%
% PWS
>1/2MCL

















%GW
PWS
> 1/2 MCL

















%SW
PWS
> 1/2 MCL

















% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level (HRL), Maximum
Contaminant Level (MCL), or Health Advisory Level (HAL) for
1 ,1 -Dichloropropene.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.27.a URCIS (Round 1) Data-1,3-Dichloropropene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
656
131


259
5

9



745
258
146

1
2
978


85

20
297


1,455
590
7
29
2,532
335
303
2
400
3


58
1

9,307

9,164
#GW
PWS
527
93


227
4

7



716
185
121

1
2
935


71

11
254


1,430
555
6
5
2,384
306
156
2
382
0


20
1

8,401

8,303
# SW PWS
134
42


46
1

2



29
73
25

0
1
43


14

9
44


25
35
2
26
150
29
147
0
29
3


38
0

947

898
% PWS
>MRL
0.00%
0.76%


0.00%
0.00%

0.00%



0.00%
0.78%
0.00%

0.00%
50.00%
0.00%


1.18%

0.00%
0.00%


0.21%
0.00%
0.00%
0.00%
0.08%
0.00%
0.00%
100.00%
1 .75%
0.00%


0.00%
0.00%

0.20%

0.16%
%GW
PWS
>MRL
0.00%
1 .08%


0.00%
0.00%

0.00%



0.00%
0.00%
0.00%

0.00%
50.00%
0.00%


1.41%

0.00%
0.00%


0.14%
0.00%
0.00%
0.00%
0.08%
0.00%
0.00%
100.00%
1.31%
0.00%


0.00%
0.00%

0.17%

0.12%
%sw
PWS
>MRL
0.00%
0.00%


0.00%
0.00%

0.00%



0.00%
2.74%
0.00%

0.00%
100.00%
0.00%


0.00%

0.00%
0.00%


4.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
6.90%
0.00%


0.00%
0.00%

0.63%

0.56%
% PWS
>HRL
0.00%
0.00%


0.00%
0.00%

0.00%



0.00%
0.00%
0.00%

0.00%
0.00%
0.00%


0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
%GW
PWS
>HRL
0.00%
0.00%


0.00%
0.00%

0.00%



0.00%
0.00%
0.00%

0.00%
0.00%
0.00%


0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
%sw
PWS
>HRL
0.00%
0.00%


0.00%
0.00%

0.00%



0.00%
0.00%
0.00%

0.00%
0.00%
0.00%


0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
99%
VALUE
(M9/L)
< 0.00
< 0.50


< 0.50
< 5.00

< 0.80



< 1.00
< 2.00
< 1.00

< 0.50
17.00
< 0.50


< 2.00

< 2.00
< 0.50


< 1.00
< 1.00
< 0.20
< 0.50
< 1.00
< 0.50
< 0.50
12.00
< 10.00
< 1.00


< 4.00
< 0.00




PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assij
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for 1,3-Dichloropropene is 40 |jg/L. This is a draft value for working review only.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                        Occurrence of Unregulated Contaminants in Public Water Systems
Table A.27.b URCIS (Round 1) Data- 1,3-Dichloropropene Occurrence in Public Water Systems- Based on Number of Samp
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
656
131


259
5

9



745
258
146

1
2
978


85

20
297


1,455
590
7
29
2,532
335
303
2
400
3


58
1

9,307

9,164
TOTAL #
SAMPLES
1,568
351


1,994
15

280



1,055
938
819

1
8
1,582


324

35
644


3,067
1,595
125
104
14,328
444
1,220
2
1,259
10


204
1

31,973
#GW
SAMPLES
1,283
244


1,862
14

145



952
624
618

1
5
1,275


298

16
569


2,706
1,475
115
28
13,659
363
433
2
1,154
0


61
1

27,903
#SW
SAMPLES
285
107


132
1

135



103
314
201

0
3
307


26

19
75


361
120
10
76
669
81
787
0
105
10


143
0

4,070

31, 104 1 27,295 1 3,809
% TOTAL
SAMPLES
>MRL
0.00%
0.28%


0.00%
0.00%

0.00%



0.00%
0.21%
0.00%

0.00%
75.00%
0.00%


0.31%

0.00%
0.00%


0.10%
0.00%
0.00%
0.00%
0.01%
0.00%
0.00%
100.00%
0.95%
0.00%


0.00%
0.00%

0.09%

0.06%
%GW
SAMPLES
>MRL
0.00%
0.41%


0.00%
0.00%

0.00%



0.00%
0.00%
0.00%

0.00%
60.00%
0.00%


0.34%

0.00%
0.00%


0.07%
0.00%
0.00%
0.00%
0.01%
0.00%
0.00%
100.00%
0.78%
0.00%


0.00%
0.00%

0.07%

0.05%
%sw
SAMPLES
>MRL
0.00%
0.00%


0.00%
0.00%

0.00%



0.00%
0.64%
0.00%

0.00%
100.00%
0.00%


0.00%

0.00%
0.00%


0.28%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.86%
0.00%


0.00%
0.00%

0.22%

0.16%
MIN
VALUE
(M9/L)
< 0.00
< 0.50


< 0.00
< 0.08

< 0.50



< 0.20
< 0.02
< 0.02

< 0.50
< 0.00
< 0.50


< 0.20

< 0.50
< 0.50


< 0.00
< 0.00
< 0.20
< 0.20
< 0.00
< 0.50
< 0.02
2.00
< 0.00
< 1.00


< 0.20
< 0.00

< 0.00
99%
VALUE
(M9/L)
< 0.00
< 0.50


< 0.50
< 5.00

< 0.80



< 1.00
< 2.00
< 1.00

< 0.50
####
< 0.50


< 2.00

< 2.00
< 0.50


< 1.00
< 1.00
< 0.20
< 0.50
< 1.00
< 0.50
< 0.50
####
< ####
< 1.00


< 4.00
< 0.00

< 1.00
MAX
VALUE
(M9/L)
< 0.00
1.60


< 2.00
< 5.00

< 0.80



< 1.00
2.00
< 1.00

< 0.50
17.00
< 0.50


0.20

< 2.00
< 0.50


1.40
< 5.00
< 0.20
< 1.00
1.00
< 0.50
< 0.50
12.00
1.90
< 1.00


< 4.00
< 0.00

17.00

< 0.00 1 < 1.00 1 2.00
MIN
DETECTS
(M9/L)

1.60










1.20



0.50



0.20





1.00



1.00


2.00
0.50






0.20
MEDIAN
DETECTS
(M9/L)

1.60










1.60



1.85



0.20





1.30



1.00


7.00
0.50






1.00

0.50 1 1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting I
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                               Occurrence of Unregulated Contaminants in Public Water Systems
Table A.27.C  URCIS (Round 1) Data-1,3-Dichloropropene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL #
SAMPLES
1,568
351


1,994
15

280



1,055
938
819

1
8
1,582


324

35
644


3,067
1,595
125
104
14,328
444
1,220
2
1,259
10


204
1

31,973

31,104
TOTAL
UNIQUE
PWS
656
131


259
5

9



745
258
146

1
2
978


85

20
297


1,455
590
7
29
2,532
335
303
2
400
3


58
1

9,307

9,164
#GW
PWS
527
93


227
4

7



716
185
121

1
2
935


71

11
254


1,430
555
6
5
2,384
306
156
2
382
0


20
1

8,401

8,303
# SW PWS
134
42


46
1

2



29
73
25

0
1
43


14

9
44


25
35
2
26
150
29
147
0
29
3


38
0

947

898
% PWS
>MRL
0.00%
0.76%


0.00%
0.00%

0.00%



0.00%
0.78%
0.00%

0.00%
50.00%
0.00%


1.18%

0.00%
0.00%


0.21%
0.00%
0.00%
0.00%
0.08%
0.00%
0.00%
100.00%
1.75%
0.00%


0.00%
0.00%

0.20%

0.16%
%GW
PWS
>MRL
0.00%
1.08%


0.00%
0.00%

0.00%



0.00%
0.00%
0.00%

0.00%
50.00%
0.00%


1.41%

0.00%
0.00%


0.14%
0.00%
0.00%
0.00%
0.08%
0.00%
0.00%
100.00%
1.31%
0.00%


0.00%
0.00%

0.17%

0.12%
%sw
PWS
>MRL
0.00%
0.00%


0.00%
0.00%

0.00%



0.00%
2.74%
0.00%

0.00%
100.00%
0.00%


0.00%

0.00%
0.00%


4.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
6.90%
0.00%


0.00%
0.00%

0.63%

0.56%
% PWS
> 1/2 HRL
0.00%
0.00%


0.00%
0.00%

0.00%



0.00%
0.00%
0.00%

0.00%
0.00%
0.00%


0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
%GW
PWS
> 1/2 HRL
0.00%
0.00%


0.00%
0.00%

0.00%



0.00%
0.00%
0.00%

0.00%
0.00%
0.00%


0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
%sw
PWS
> 1/2 HRL
0.00%
0.00%


0.00%
0.00%

0.00%



0.00%
0.00%
0.00%

0.00%
0.00%
0.00%


0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
% PWS
>HRL
0.00%
0.00%


0.00%
0.00%

0.00%



0.00%
0.00%
0.00%

0.00%
0.00%
0.00%


0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
%GW
PWS
>HRL
0.00%
0.00%


0.00%
0.00%

0.00%



0.00%
0.00%
0.00%

0.00%
0.00%
0.00%


0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
%sw
PWS
>HRL
0.00%
0.00%


0.00%
0.00%

0.00%



0.00%
0.00%
0.00%

0.00%
0.00%
0.00%


0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for la
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for 1,3-Dichloropropene is 40 [ig/L. This is a draft value for working review only.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.28.a URCIS (Round 1) Data- Ethyl Benzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
731
131
3
943
3,517
21
1
13
252
1,162
127
1,002
1,300
369
524
13
9
844
14
1,565
85
22
565
298
19
11
1,514
590
8
357
2,655

303
23
415
3
5
992
137
145

20,688

20,081
GWPWS
593
93
2
873
3,491
12
0
11
50
1,053
112
963
1,186
331
291
9
8
798
12
1,540
71
22
523
255
19
11
1,489
555
7
253
2,492

156
18
395
0
3
937
63
116

18,813

18,355
SWPWS
144
42
1
105
38
10
1
2
226
109
16
39
114
39
233
4
2
51
2
29
14
0
57
44
0
0
25
35
2
123
167

147
5
34
3
2
77
75
38

2,055

1,884
% PWS >
MRL
4.92%
9.92%
100.00%
0.11%
0.82%
52.38%
0.00%
0.00%
1 1 .90%
0.43%
0.00%
2.10%
1 .31 %
1 .08%
2.10%
0.00%
100.00%
1 .07%
100.00%
3.26%
7.06%
100.00%
0.71 %
6.71 %
100.00%
100.00%
0.59%
0.85%
0.00%
1 .40%
1 .21 %

0.66%
100.00%
1 .69%
0.00%
60.00%
0.91 %
1 .46%
5.52%

2.18%

1 .62%
%GW
PWS>
MRL
4.22%
9.68%
100.00%
0.00%
0.74%
41 .67%
0.00%
0.00%
12.00%
0.47%
0.00%
1 .97%
1.18%
0.91 %
2.06%
0.00%
100.00%
0.63%
100.00%
3.18%
8.45%
100.00%
0.76%
7.84%
100.00%
100.00%
0.60%
0.90%
0.00%
0.79%
1 .20%

0.00%
100.00%
1 .52%
0.00%
100.00%
0.85%
1 .59%
6.03%

1 .94%

1 .40%
%sw
PWS>
MRL
8.33%
9.52%
100.00%
0.95%
7.89%
60.00%
0.00%
0.00%
10.62%
0.00%
0.00%
5.13%
2.63%
2.56%
2.15%
0.00%
100.00%
7.84%
100.00%
6.90%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.44%
1 .20%

1 .36%
100.00%
2.94%
0.00%
0.00%
1 .30%
1 .33%
2.63%

4.28%

3.66%
% PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
99% VALUE
(M9/L)
1.20
6.70
10.3
< 5.00
< 5.00
510.00
< 0.50
< 0.50
6.00
< 0.50
< 0.30
0.60
< 1.00
< 2.00
< 1.00
< 0.50
41.00
< 1.00
680.00
0.30
4.00
15.60
< 1.00
4.60
31.20
39.00
< 1.00
< 5.00
< 0.20
< 1.00
< 1.00

< 0.50
66.00
< 10.00
< 1.00
5.00
< 0.50
< 4.00
1.20

< 5.00

< 5.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Ethyl Benzene is 700 |jg/L.
The highlighted States are part of the  URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.28.b  URCIS (Round 1) Data- Ethyl Benzene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
731
131
3
943
3,517
21
1
13
252
1,162
127
1,002
1,300
369
524
13
9
844
14
1,565
85
22
565
298
19
11
1,514
590
8
357
2,655

303
23
415
3
5
992
137
145

20,688

20,081
TOTAL #
SAMPLES
2,014
354
7
2,921
1 1 ,486
49
61
333
369
2,463
1,221
1,929
5,334
1,941
2,312
22
16
1,786
29
2,750
323
25
1,623
645
21
13
3,158
1,595
148
2,092
16,087

1,220
34
1,286
10
7
3,987
389
313

70,373

67,183
#GW
SAMPLES
1,703
246
4
2,262
1 1 ,384
36
0
189
82
1,864
1,081
1,717
4,331
1,520
1,172
18
13
1,306
20
2,671
297
25
1,376
570
21
13
2,793
1,475
136
1,566
15,167

433
29
1,174
0
5
3,656
164
259

60,778

58,406
#SW
SAMPLES
311
108
3
659
102
13
61
144
287
599
140
212
1,003
421
1,140
4
3
480
9
79
26
0
247
75
0
0

120
12
526
920

787
5
112
10
2
331
225
54

9,595

8,412
% TOTAL
SAMPLES
>MRL
2.48%
4.80%
100.00%
0.03%
0.38%
28.57%
0.00%
0.00%
9.21%
0.20%
0.00%
1.19%
0.37%
0.52%
0.87%
0.00%
100.00%
0.67%
100.00%
2.07%
4.33%
100.00%
0.49%
3.72%
100.00%
100.00%
0.44%
0.75%
0.00%
0.33%
0.30%

0.16%
100.00%
0.86%
0.00%
57.14%
0.23%
0.51%
3.19%

0.88%

0.64%
%GW
SAMPLES
>MRL
2.00%
5.28%
100.00%
0.00%
0.36%
13.89%
0.00%
0.00%
8.54%
0.27%
0.00%
1 .22%
0.39%
0.53%
0.51%
0.00%
100.00%
0.46%
100.00%
2.02%
4.71 %
100.00%
0.58%
4.21%
100.00%
100.00%
0.50%
0.81 %
0.00%
0.26%
0.30%

0.00%
100.00%
0.85%
0.00%
80.00%
0.22%
0.61%
3.47%

0.81 %

0.59%
%SW
SAMPLES
>MRL
5.14%
3.70%
100.00%
0.15%
2.94%
69.23%
0.00%
0.00%
9.41 %
0.00%
0.00%
0.94%
0.30%
0.48%
1 .23%
0.00%
100.00%
1 .25%
100.00%
3.80%
0.00%
0.00%
0.00%
0.00%
#DIV/0!
0.00%
0.00%
0.00%
0.00%
0.57%
0.33%

0.25%
100.00%
0.89%
0.00%
0.00%
0.30%
0.44%
1 .85%

1 .27%

1 .07%
MIN VALUE
(M9/L)
< 0.00
< 0.08
0.4
< 0.05
< 0.00
< 0.00
< 0.50
< 0.20
< 0.00
< 0.50
< 0.00
< 0.20
< 0.02
< 0.06
< 0.50
< 0.50
0.06
< 0.10
1.00
< 0.10
< 0.20
0.40
< 0.50
< 0.09
0.20
0.60
< 0.00
< 0.00
< 0.20
< 0.06
< 0.00

< 0.00
0.90
< 0.00
< 1.00
< 0.00
< 0.50
< 0.20
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
1.20
6.70
10.3
< 5.00
< 5.00
510.00
< 0.50
< 0.50
6.00
< 0.50
< 0.30
0.60
< 1.00
< 2.00
< 1.00
< 0.50
41.00
< 1.00
680.00
0.30
4.00
15.60
< 1.00
4.60
31.20
39.00
< 1.00
< 5.00
< 0.20
< 1.00
< 1.00

< 0.50
66.00
< 10.00
< 1.00
5.00
< 0.50
< 4.00
1.20

< 5.00

< 5.00
MAX
VALUE
(M9/L)
270.00
13.90
10.3
7.00
100.00
510.00
< 0.50
< 0.60
56.00
2.30
< 0.30
4.00
9.40
1.60
85.00
< 0.50
41.00
4.00
680.00
1.40
33.20
15.60
1.70
14.50
31.20
39.00
130.00
3.30
< 0.20
8.00
36.20

0.70
66.00
4.00
< 1.00
5.00
12.00
3.00
8.50

680.00

270.00
MIN
DETECTS
(M9/L)
0.10
0.08
0.40
7.00
0.20
0.38


0.01
0.80

0.50
0.02
0.54
1.00

0.06
0.10
1.00
0.10
1.00
0.40
0.60
0.09
0.20
0.60
0.45
0.40

0.80
0.50

0.50
0.90
0.10

0.50
0.50
1.20
0.20

0.01

0.01
MEDIAN
DETECTS
(M9/L)
0.65
2.00
0.50
7.00
1.69
2.18


2.60
1.10

1.00
0.65
0.55
2.50

0.53
0.30
5.00
0.30
3.20
1.00
1.70
1.72
0.50
1.20
0.63
1.55

2.60
1.15

0.60
3.10
0.10

2.40
1.30
2.10
0.65

1.00

1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.28.C  URCIS (Round 1) Data- Ethyl Benzene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
2,014
354
7
2,921
11,486
49
61
333
369
2,463
1,221
1,929
5,334
1,941
2,312
22
16
1,786
29
2,750
323
25
1,623
645
21
13
3,158
1,595
148
2,092
16,087

1,220
34
1,286
10
7
3,987
389
313

70,373

67,183
TOTAL
UNIQUE
PWS
731
131
3
943
3,517
21
1
13
252
1,162
127
1,002
1,300
369
524
13
9
844
14
1,565
85
22
565
298
19
11
1,514
590
8
357
2,655

303
23
415
3
5
992
137
145

20,688

20,081
#GW
PWS
593
93
2
873
3,491
12
0
11
50
1,053
112
963
1,186
331
291
9
8
798
12
1,540
71
22
523
255
19
11
1,489
555
7
253
2,492

156
18
395
0
3
937
63
116

18,813

18,355
#SW
PWS
144
42
1
105
38
10
1
2
226
109
16
39
114
39
233
4
2
51
2
29
14
0
57
44
0
0
25
35
2
123
167

147
5
34
3
2
77
75
38

2,055

1,884
% PWS
>MRL
4.92%
9.92%
100.00%
0.11%
0.82%
52.38%
0.00%
0.00%
11.90%
0.43%
0.00%
2.10%
1.31%
1.08%
2.10%
0.00%
100.00%
1.07%
100.00%
3.26%
7.06%
100.00%
0.71%
6.71%
100.00%
100.00%
0.59%
0.85%
0.00%
1.40%
1.21%

0.66%
100.00%
1.69%
0.00%
60.00%
0.91%
1.46%
5.52%

2.18%

1.62%
%GW
PWS
>MRL
4.22%
9.68%
100.00%
0.00%
0.74%
41 .67%
0.00%
0.00%
12.00%
0.47%
0.00%
1 .97%
1.18%
0.91 %
2.06%
0.00%
100.00%
0.63%
100.00%
3.18%
8.45%
100.00%
0.76%
7.84%
100.00%
100.00%
0.60%
0.90%
0.00%
0.79%
1 .20%

0.00%
100.00%
1 .52%
0.00%
100.00%
0.85%
1 .59%
6.03%

1 .94%

1 .40%
%sw
PWS
>MRL
8.33%
9.52%
100.00%
0.95%
7.89%
60.00%
0.00%
0.00%
10.62%
0.00%
0.00%
5.13%
2.63%
2.56%
2.15%
0.00%
100.00%
7.84%
100.00%
6.90%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.44%
1.20%

1.36%
100.00%
2.94%
0.00%
0.00%
1.30%
1.33%
2.63%

4.28%

3.66%
% PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%
0.00%
4.76%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
7.14%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01 %

0.00%
%GW
PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%
0.00%
8.33%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
8.33%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01%

0.00%
%sw
PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the
The Maximum Contaminant Level (MCL) for Ethyl Benzene is 700 ug/L
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.29.a URCIS (Round 1) Data- Hexachlorobutadiene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
665
131

448
585
6
1
10
112

127

213
357
524
13

983

1,553
85


297


801
590
8
356
2,655
335
303
2
411
3

992
57
145

12,768

12,284
# GW PWS
540
93

407
571
3
0
8
7

112

149
321
291
9

936

1,529
71


254


790
555
7
252
2,493
306
156
2
391
0

937
26
116

1 1 ,332

10,980
#SWPWS
130
42

47
21
4
1
2
105

16

64
37
233
4

50

28
14


44


11
35
2
123
166
29
147
0
34
3

77
31
38

1,538

1,385
% PWS
>MRL
1 .50%
3.05%

0.89%
0.00%
0.00%
0.00%
0.00%
5.36%

0.00%

0.47%
0.00%
0.00%
0.00%

0.10%

0.00%
0.00%


0.00%


0.75%
0.00%
0.00%
0.28%
0.11%
0.30%
0.33%
100.00%
1 .22%
0.00%

0.10%
0.00%
0.00%

0.36%

0.35%
% GW PWS
>MRL
1 .48%
4.30%

0.74%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.67%
0.00%
0.00%
0.00%

0.11%

0.00%
0.00%


0.00%


0.76%
0.00%
0.00%
0.40%
0.12%
0.33%
0.64%
100.00%
1 .02%
0.00%

0.11%
0.00%
0.00%

0.32%

0.30%
% SW PWS
>MRL
1 .54%
0.00%

2.13%
0.00%
0.00%
0.00%
0.00%
5.71%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.94%
0.00%

0.00%
0.00%
0.00%

0.65%

0.72%
% PWS
>HRL
0.00%
1 .53%

0.22%
0.00%
0.00%
0.00%
0.00%
5.36%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%


0.25%
0.00%
0.00%
0.28%
0.08%
0.00%
0.33%
100.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.12%

0.11%
% GW PWS
>HRL
0.00%
2.15%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%


0.25%
0.00%
0.00%
0.40%
0.08%
0.00%
0.64%
100.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.07%

0.06%
% SW PWS
>HRL
0.00%
0.00%

2.13%
0.00%
0.00%
0.00%
0.00%
5.71%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.46%

0.51%
99% VALUE
(M9/L)
< 0.00
0.50

< 2.00
< 6.00
< 0.64
< 0.50
< 0.50
5.00

< 0.30

< 2.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
< 20.00


< 0.50


< 1.20
< 1.00
< 0.20
< 5.00
< 2.00
< 0.50
< 0.50
8.00
< 5.00
< 1.00

< 0.50
< 4.00
< 2.00

< 5.00

< 5.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting
Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Hexachlorobutadiene is 0.9 ug/L. This is a draft value for working review only.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.29.b URCIS (Round 1) Data- Hexachlorobutadiene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE PWS
665
131

448
585
6
1
10
112

127

213
357
524
13

983

1,553
85


297


801
590
8
356
2,655
335
303
2
411
3

992
57
145

12,768

12,284
TOTAL #
SAMPLES
1,745
351

1,104
2,005
9
48
53
130

1,221

728
1,889
2,076
22

1,750

2,654
323


644


1,630
1,595
148
2,095
15,951
444
1,220
2
1,233
10

3,987
169
313

45,549

42,839
#GW
SAMPLES
1,480
244

940
1,949
5
0
44
10

1,081

485
1,486
1,119
18

1,376

2,586
297


569


1,443
1,475
136
1,560
15,038
363
433
2
1,128
0

3,656
64
259

39,246

37,184
#SW
SAMPLES
265
107

164
56
4
48
9
120

140

243
403
957
4

374

68
26


75


187
120
12
535
913
81
787
0
105
10

331
105
54

6,303

5,655
% TOTAL
SAMPLES
>MRL
0.63%
1.14%

0.63%
0.00%
0.00%
0.00%
0.00%
4.62%

0.00%

0.55%
0.00%
0.00%
0.00%

0.06%

0.00%
0.00%


0.00%


0.37%
0.00%
0.00%
0.05%
0.02%
0.23%
0.08%
100.00%
0.73%
0.00%

0.03%
0.00%
0.00%

0.13%

0.13%
%GW
SAMPLES
>MRL
0.61%
1.64%

0.32%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.82%
0.00%
0.00%
0.00%

0.07%

0.00%
0.00%


0.00%


0.42%
0.00%
0.00%
0.06%
0.02%
0.28%
0.23%
100.00%
0.71%
0.00%

0.03%
0.00%
0.00%

0.11%

0.11%
%sw
SAMPLES
>MRL
0.75%
0.00%

2.44%
0.00%
0.00%
0.00%
0.00%
5.00%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.95%
0.00%

0.00%
0.00%
0.00%

0.21%

0.23%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.00
< 0.50
< 0.40
< 0.00

< 0.00

< 0.05
< 0.09
< 0.50
< 0.50

< 0.10

< 0.50
< 0.20


< 0.50


< 0.00
< 0.00
< 0.20
< 0.11
< 0.20
< 0.16
< 0.02
6.00
< 0.10
< 1.00

< 0.50
< 0.50
< 0.60

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
0.50

< 2.00
< 6.00
< 0.64
< 0.50
< 0.50
5.00

< 0.30

< 2.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
< 20.00


< 0.50


< 1.20
< 1.00
< 0.20
< 5.00
< 2.00
< 0.50
< 0.50
8.00
< 5.00
< 1.00

< 0.50
< 4.00
< 2.00

< 5.00

< 5.00
MAX VALUE
(M9/L)
0.30
1.00

10.00
< 10.00
< 0.64
< 0.50
< 0.50
10.00

< 0.30

0.17
< 5.00
< 1.00
< 0.50

0.10

< 5.00
< 20.00


< 0.50


1.00
< 5.00
< 0.20
3.00
2.00
0.16
4.20
8.00
0.20
< 1.00

0.60
< 4.00
< 2.00

10.00

10.00
MIN DETECTS
(M9/L)
0.20
0.50

0.05




1.00



0.05




0.10








0.05


3.00
0.50
0.16
4.20
6.00
0.10


0.60



0.05

0.05
MEDIAN
DETECTS
(M9/L)
0.20
0.85

10.00




5.00



0.17




0.10








0.12


3.00
2.00
0.16
4.20
7.00
0.20


0.60



0.30

0.25
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                                     Occurrence of Unregulated Contaminants in Public Water Systems
Table A.29.C  URCIS (Round 1) Data- Hexachlorobutadiene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL #
SAMPLES
1,745
351

1,104
2,005
9
48
53
130

1,221

728
1,889
2,076
22

1,750

2,654
323


644


1,630
1,595
148
2,095
15,951
444
1,220
2
1,233
10

3,987
169
313

45,549

42,839
TOTAL
UNIQUE PWS
665
131

448
585
6
1
10
112

127

213
357
524
13

983

1,553
85


297


801
590
8
356
2,655
335
303
2
411
3

992
57
145

12,768

12,284
3GWPWS
540
93

407
571
3
0
8
7

112

149
321
291
9

936

1,529
71


254


790
555
7
252
2,493
306
156
2
391
0

937
26
116

1 1 ,332

10,980
# SW PWS
130
42

47
21
4
1
2
105

16

64
37
233
4

50

28
14


44


11
35
2
123
166
29
147
0
34
3

77
31
38

1,538

1,385
% PWS
>MRL
1.50%
3.05%

0.89%
0.00%
0.00%
0.00%
0.00%
5.36%

0.00%

0.47%
0.00%
0.00%
0.00%

0.10%

0.00%
0.00%


0.00%


0.75%
0.00%
0.00%
0.28%
0.11%
0.30%
0.33%
100.00%
1.22%
0.00%

0.10%
0.00%
0.00%

0.36%

0.35%
% GW PWS
>MRL
1.48%
4.30%

0.74%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.67%
0.00%
0.00%
0.00%

0.11%

0.00%
0.00%


0.00%


0.76%
0.00%
0.00%
0.40%
0.12%
0.33%
0.64%
100.00%
1.02%
0.00%

0.11%
0.00%
0.00%

0.32%

0.30%
% SW PWS
>MRL
1.54%
0.00%

2.13%
0.00%
0.00%
0.00%
0.00%
5.71%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.94%
0.00%

0.00%
0.00%
0.00%

0.65%

0.72%
%PWS
> 1/2 HRL
0.00%
3.05%

0.67%
0.00%
0.00%
0.00%
0.00%
5.36%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%


0.25%
0.00%
0.00%
0.28%
0.11%
0.00%
0.33%
100.00%
0.00%
0.00%

0.10%
0.00%
0.00%

0.18%

0.16%
% GW PWS
> 1/2 HRL
0.00%
4.30%

0.49%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%


0.25%
0.00%
0.00%
0.40%
0.12%
0.00%
0.64%
100.00%
0.00%
0.00%

0.11%
0.00%
0.00%

0.14%

0.12%
% SW PWS
> 1/2 HRL
0.00%
0.00%

2.13%
0.00%
0.00%
0.00%
0.00%
5.71%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.46%

0.51%
% PWS
>HRL
0.00%
1.53%

0.22%
0.00%
0.00%
0.00%
0.00%
5.36%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%


0.25%
0.00%
0.00%
0.28%
0.08%
0.00%
0.33%
100.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.12%

0.11%
% GW PWS
>HRL
0.00%
2.15%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%


0.25%
0.00%
0.00%
0.40%
0.08%
0.00%
0.64%
100.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.07%

0.06%
% SW PWS
>HRL
0.00%
0.00%

2.13%
0.00%
0.00%
0.00%
0.00%
5.71%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.46%

0.51%
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Hexachlorobutadiene is 0.9 Mg/L. This is a draft value for working review only.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                 Occurrence of Unregulated Contaminants in Public Water Systems
Table A.30.a URCIS (Round 1) Data- Isopropylbenzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
671
131

440
144
7
1
10

1,162


213
357
524
13
1
983

1,565
85
3

297
2
1
795
590
8
356
2,656
335
303
1
411
3

992
57
145

13,262

12,771
GWPWS
545
93

402
132
4

8

1,053


149
321
291
9
1
936

1,540
71
3

254
2
1
784
555
7
252
2,493
306
156

391


937
26
116

1 1 ,838

1 1 ,480
SWPWS
131
42

44
18
4
1
2

109


64
37
233
4

50

29
14


44
11


35
2
123
167
29
147
1
34
3

77
31
38

1,524

1,359
% PWS >
MRL
1 .64%
1 .53%

0.23%
0.69%
42.86%
0.00%
0.00%

0.09%


0.47%
0.00%
0.38%
0.00%
100.00%
0.00%

0.00%
0.00%
100.00%

0.67%
100.00%
100.00%
0.50%
0.00%
0.00%
0.28%
0.19%
0.00%
0.00%
1
0.97%
0.00%

0.00%
0.00%
0.69%

0.35%

0.27%
%GW
PWS>
MRL
2.02%
1 .08%

0.25%
0.76%
50.00%
0.00%
0.00%

0.09%


0.67%
0.00%
0.69%
0.00%
100.00%
0.00%

0.00%
0.00%
100.00%

0.79%
100.00%
100.00%
0.51 %
0.00%
0.00%
0.00%
0.16%
0.00%
0.00%
0
0.77%
0.00%

0.00%
0.00%
0.86%

0.35%

0.28%
%sw
PWS>
MRL
0.00%
2.38%

0.00%
0.00%
25.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.81 %
0.60%
0.00%
0.00%
1
2.94%
0.00%

0.00%
0.00%
0.00%

0.39%

0.22%
% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level
(HRL), Maximum Contaminant
Level (MCL), or Health Advisory
Level (HAL) for Isopropylbenzene.




























































99%
VALUE
(M9/L)
< 0.00
< 0.50

< 1.00
< 0.50
1.85
< 0.50
< 0.40

< 0.50


< 2.00
< 2.00
< 1.00
< 0.50
1.80
< 0.50

< 1.00
< 2.00
1.00

< 0.50
1.40
1.70
< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50
2.60
< 5.00
< 1.00

< 0.50
< 4.00
< 1.00

< 2.00

< 2.00
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.30.b URCIS (Round 1) Data- Isopropylbenzene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
671
131

440
144
7
1
10

1,162


213
357
524
13
1
983

1,565
85
3

297
2
1
795
590
8
356
2,656
335
303
1
411
3

992
57
145

13,262

12,771
TOTAL #
SAMPLES
1,767
351

1,056
1,118
10
48
53

2,461


728
1,889
2,076
22
1
1,749

2,755
323
3

644
3
2
1,624
1,595
148
2,088
16,087
444
1,220
1
1,234
10

3,987
169
313

45,979

43,267
#GW
SAMPLES
1,496
244

900
1,067
6
0
44

1,864


485
1,486
1,119
18
1
1,375

2,676
297
3

569
3
2
1,437
1,475
136
1,559
15,167
363
433
0
1,129
0

3,656
64
259

39,333

37,264
#SW
SAMPLES
271
107

156
51
4
48
9

597


243
403
957
4
0
374

79
26
0

75
0
0
187
120
12
529
920
81
787
1
105
10

331
105
54

6,646

6,003
% TOTAL
SAMPLES
>MRL
0.74%
0.85%

0.09%
0.72%
30.00%
0.00%
0.00%

0.04%


0.55%
0.00%
0.10%
0.00%
100.00%
0.00%

0.00%
0.00%
100.00%

0.31 %
100.00%
100.00%
0.25%
0.00%
0.00%
0.05%
0.03%
0.00%
0.00%
100.00%
0.65%
0.00%

0.00%
0.00%
0.64%

0.15%

0.12%
%GW
SAMPLES
>MRL
0.87%
0.41%

0.11%
0.75%
33.33%
0.00%
0.00%

0.05%


0.82%
0.00%
0.18%
0.00%
100.00%
0.00%

0.00%
0.00%
100.00%

0.35%
100.00%
100.00%
0.28%
0.00%
0.00%
0.00%
0.03%
0.00%
0.00%
0.00%
0.62%
0.00%

0.00%
0.00%
0.77%

0.15%

0.13%
%SW
SAMPLES
>MRL
0.00%
1 .87%

0.00%
0.00%
25.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.19%
0.11%
0.00%
0.00%
100.00%
0.95%
0.00%

0.00%
0.00%
0.00%

0.11%

0.07%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.10
< 0.00
< 0.15
< 0.00
< 0.20

< 0.50


< 0.01
< 0.10
< 0.50
< 0.50
1.80
< 0.20

< 0.20
< 0.20
0.60

< 0.50
0.30
1.30
< 0.00
< 0.00
< 0.20
< 0.10
< 0.20
< 0.50
< 0.05
2.60
< 0.00
< 1.00

< 0.50
< 0.50
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
< 0.50

< 1.00
< 0.50
1.85
< 0.50
< 0.40

< 0.50


< 2.00
< 2.00
< 1.00
< 0.50
1.80
< 0.50

< 1.00
< 2.00
1.00

< 0.50
1.40
1.70
< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50
2.60
< 5.00
< 1.00

< 0.50
< 4.00
< 1.00

< 2.00

< 2.00
MAX
VALUE
(M9/L)
6.00
2.27

5.00
10.00
1.85
< 0.50
< 0.40

1.10


2.00
< 5.00
5.00
< 0.50
1.80
< 1.00

< 5.00
< 2.00
1.00

3.30
1.40
1.70
1.00
< 5.00
< 0.20
10.00
2.40
< 0.50
< 0.50
2.60
10.00
< 1.00

< 0.50
< 4.00
1.30

10.00

10.00
MIN
DETECTS
(M9/L)
0.20
0.90

0.90
0.61
0.38



1.10


0.01

4.00

1.80




0.60

0.73
0.30
1.30
0.02


0.20
1.00


2.60
0.10




0.20

0.01

0.01
MEDIAN
DETECTS
(M9/L)
0.90
1.21

0.90
1.30
1.60



1.10


0.15

4.50

1.80




0.70

2.02
0.60
1.50
0.48


0.20
1.10


2.60
0.10




0.75

0.94

0.90
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.30.C  URCIS (Round 1) Data- Isopropylbenzene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,767
351

1,056
1,118
10
48
53

2,461


728
1,889
2,076
22
1
1,749

2,755
323
3

644
3
2
1,624
1,595
148
2,088
16,087
444
1,220
1
1,234
10

3,987
169
313

45,979

43,267
TOTAL
UNIQUE
PWS
671
131

440
144
7
1
10

1,162


213
357
524
13
1
983

1,565
85
3

297
2
1
795
590
8
356
2,656
335
303
1
411
3

992
57
145

13,262

12,771
#GW
PWS
545
93

402
132
4
0
8

1,053


149
321
291
9
1
936

1,540
71
3

254
2
1
784
555
7
252
2,493
306
156
0
391
0

937
26
116

1 1 ,838

1 1 ,480
#SW
PWS
131
42

44
18
4
1
2

109


64
37
233
4
0
50

29
14
0

44
11
0
0
35
2
123
167
29
147
1
34
3

77
31
38

1,524

1,359
% PWS
>MRL
1 .64%
1.53%

0.23%
0.69%
42.86%
0.00%
0.00%

0.09%


0.47%
0.00%
0.38%
0.00%
100.00%
0.00%

0.00%
0.00%
100.00%

0.67%
100.00%
100.00%
0.50%
0.00%
0.00%
0.28%
0.19%
0.00%
0.00%
100.00%
0.97%
0.00%

0.00%
0.00%
0.69%

0.35%

0.27%
%GW
PWS
>MRL
2.02%
1.08%

0.25%
0.76%
50.00%
0.00%
0.00%

0.09%


0.67%
0.00%
0.69%
0.00%
100.00%
0.00%

0.00%
0.00%
100.00%

0.79%
100.00%
100.00%
0.51%
0.00%
0.00%
0.00%
0.16%
0.00%
0.00%
0.00%
0.77%
0.00%

0.00%
0.00%
0.86%

0.35%

0.28%
%SW
PWS
>MRL
0.00%
2.38%

0.00%
0.00%
25.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.81%
0.60%
0.00%
0.00%
100.00%
2.94%
0.00%

0.00%
0.00%
0.00%

0.39%

0.22%
% PWS
>1/2MCL

















%GW
PWS
> 1/2 MCL

















%SW
PWS
> 1/2 MCL

















% PWS
>MCL

















I here is no Health Keterence Level (
%GW
PWS
>MCL

















%sw
PWS
>MCL

















HKL), Maximum
Contaminant Level (MCL), or Health Advisory Level (HAL) for
Isooroov








































































benzene.









































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.31 .a URCIS (Round 1) Data- m-Dichlorobenzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
692
131

939
3,522
9
1
13
155
1,161
127
1,002
1,302
365
524
13

983

1,565
85

565
297


1,524
590
8
357
2,655
335
303

419
3
1
992
136
145

20,919

20,429
GWPWS
560
93

870
3,495
7
0
11
27
1,052
112
963
1,187
327
291
9

936

1,540
71

523
254


1,499
555
7
253
2,492
306
156

399
0
1
937
62
116

19,111

18,752
SWPWS
138
42

105
35
3
1
2
141
109
16
39
115
39
233
4

50

29
14

57
44


25
35
2
123
167
29
147

34
3
0
77
75
38

1,971

1,819
% PWS >
MRL
0.43%
3.82%

0.00%
0.14%
0.00%
0.00%
0.00%
4.52%
0.00%
0.00%
0.00%
0.46%
0.00%
0.00%
0.00%

0.51 %

0.00%
0.00%

0.00%
1 .01 %


0.46%
0.17%
0.00%
0.56%
0.15%
0.30%
0.00%

0.72%
0.00%
100.00%
0.00%
0.00%
0.69%

0.26%

0.25%
%GW
PWS>
MRL
0.54%
2.15%

0.00%
0.11%
0.00%
0.00%
0.00%
3.70%
0.00%
0.00%
0.00%
0.34%
0.00%
0.00%
0.00%

0.43%

0.00%
0.00%

0.00%
1.18%


0.47%
0.18%
0.00%
0.40%
0.12%
0.33%
0.00%

0.75%
0.00%
100.00%
0.00%
0.00%
0.86%

0.20%

0.20%
%sw
PWS>
MRL
0.00%
7.14%

0.00%
2.86%
0.00%
0.00%
0.00%
4.26%
0.00%
0.00%
0.00%
1 .74%
0.00%
0.00%
0.00%

2.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.81 %
0.60%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.76%

0.77%
% PWS
>HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
99% VALUE
(M9/L)
< 0.00
0.90

< 0.00
< 0.00
< 0.00
< 0.00
< 0.00
5.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50

< 0.50

< 1.00
< 5.00

< 1.00
< 0.50


< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50

< 5.00
< 1.00
0.50
< 0.50
< 4.00
< 1.00

< 5.00

< 5.00
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > HAL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HAL.
The Health Advisory Limit (HAL) for m-Dichlorobenzene is 600 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.31.b  URCIS (Round 1) Data- m-Dichlorobenzene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
692
131

939
3,522
9
1
13
155
1,161
127
1,002
1,302
365
524
13

983

1,565
85

565
297


1,524
590
8
357
2,655
335
303

419
3
1
992
136
145

20,919

20,429
TOTAL #
SAMPLES
1,829
351

2,885
1 1 ,762
33
62
333
211
2,461
1,221
1,908
5,999
1,943
2,311
22

1,754

2,756
322

1,624
644


3,215
1,595
148
2,571
16,084
444
1,221

1,313
10
1
3,987
388
313

71,721

68,219
#GW
SAMPLES
1,531
244

2,246
1 1 ,678
30
0
189
43
1,863
1,081
1,696
5,033
1,518
1,172
18

1,380

2,677
296

1,376
569


2,856
1,475
136
1,882
15,164
363
434

1,197
0
1
3,656
161
259

62,224

59,672
#SW
SAMPLES
298
107

639
84
3
62
144
168
598
140
212
966
425
1,139
4

374

79
26

248
75


359
120
12
689
920
81
787

116
10
0
331
227
54

9,497

8,547
% TOTAL
SAMPLES
>MRL
0.16%
1 .42%

0.00%
0.11%
0.00%
0.00%
0.00%
3.32%
0.00%
0.00%
0.00%
0.23%
0.00%
0.00%
0.00%

0.40%

0.00%
0.00%

0.00%
0.47%


0.34%
0.06%
0.00%
0.12%
0.02%
0.23%
0.00%

0.53%
0.00%
100.00%
0.00%
0.00%
0.32%

0.11%

0.11%
%GW
SAMPLES
>MRL
0.20%
0.82%

0.00%
0.10%
0.00%
0.00%
0.00%
2.33%
0.00%
0.00%
0.00%
0.24%
0.00%
0.00%
0.00%

0.43%

0.00%
0.00%

0.00%
0.53%


0.39%
0.07%
0.00%
0.11%
0.02%
0.28%
0.00%

0.58%
0.00%
100.00%
0.00%
0.00%
0.39%

0.11%

0.11%
%SW
SAMPLES
>MRL
0.00%
2.80%

0.00%
1.19%
0.00%
0.00%
0.00%
3.57%
0.00%
0.00%
0.00%
0.21%
0.00%
0.00%
0.00%

0.27%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.15%
0.11%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.16%

0.16%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.06
< 0.50
< 0.30
< 0.00
< 0.50
< 0.00
< 0.30
< 0.03
< 0.05
< 0.50
< 0.50

< 0.10

< 0.10
< 0.20

< 0.50
< 0.50


< 0.00
< 0.00
< 0.20
< 0.12
< 0.00
< 0.15
< 0.02

< 0.00
< 1.00
0.50
< 0.50
< 0.15
< 0.00

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
0.90

< 0.00
< 0.00
< 0.00
< 0.00
< 0.00
5.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50

< 0.50

< 1.00
< 5.00

< 1.00
< 0.50


< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50

< 5.00
< 1.00
0.50
< 0.50
< 4.00
< 1.00

< 5.00

< 5.00
MAX
VALUE
(M9/L)
0.30
19.30

< 10.00
8.10
< 5.00
< 0.50
< 0.50
10.00
< 0.50
< 0.30
< 1.00
9.70
< 5.00
< 1.00
< 0.50

22.40

< 2.00
< 5.00

< 1.00
2.00


12.30
1.74
< 0.20
7.00
9.10
0.15
< 0.50

0.10
< 1.00
0.50
< 0.50
< 5.00
0.20

22.40

22.40
MIN
DETECTS
(M9/L)
0.20
0.90


0.70



0.10



0.03




0.10





1.08


0.10
1.74

0.50
0.72
0.15


0.10

0.50


0.20

0.03

0.03
MEDIAN
DETECTS
(M9/L)
0.20
1.00


1.40



5.00



3.75




2.20





1.10


2.27
1.74

0.80
1.00
0.15


0.10

0.50


0.20

1.00

1.08
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.31 .c URCIS (Round 1) Data- m-Dichlorobenzene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,829
351

2,885
11,762
33
62
333
211
2,461
1,221
1,908
5,999
1,943
2,311
22

1,754

2,756
322

1,624
644


3,215
1,595
148
2,571
16,084
444
1,221

1,313
10
1
3,987
388
313

71,721

68,219
TOTAL
UNIQUE
PWS
692
131

939
3,522
9
1
13
155
1,161
127
1,002
1,302
365
524
13

983

1,565
85

565
297


1,524
590
8
357
2,655
335
303

419
3
1
992
136
145

20,919

20,429
#GW
PWS
560
93

870
3,495
7
0
11
27
1,052
112
963
1,187
327
291
9

936

1,540
71

523
254


1,499
555
7
253
2,492
306
156

399
0
1
937
62
116

19,111

18,752
# SW PWS
138
42

105
35
3
1
2
141
109
16
39
115
39
233
4

50

29
14

57
44


25
35
2
123
167
29
147

34
3
0
77
75
38

1,971

1,819
% PWS
>MRL
0.43%
3.82%

0.00%
0.14%
0.00%
0.00%
0.00%
4.52%
0.00%
0.00%
0.00%
0.46%
0.00%
0.00%
0.00%

0.51%

0.00%
0.00%

0.00%
1.01%


0.46%
0.17%
0.00%
0.56%
0.15%
0.30%
0.00%

0.72%
0.00%
100.00%
0.00%
0.00%
0.69%

0.26%

0.25%
%GW
PWS
>MRL
0.54%
2.15%

0.00%
0.11%
0.00%
0.00%
0.00%
3.70%
0.00%
0.00%
0.00%
0.34%
0.00%
0.00%
0.00%

0.43%

0.00%
0.00%

0.00%
1.18%


0.47%
0.18%
0.00%
0.40%
0.12%
0.33%
0.00%

0.75%
0.00%
100.00%
0.00%
0.00%
0.86%

0.20%

0.20%
%SW
PWS
>MRL
0.00%
7.14%

0.00%
2.86%
0.00%
0.00%
0.00%
4.26%
0.00%
0.00%
0.00%
1 .74%
0.00%
0.00%
0.00%

2.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.81%
0.60%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.76%

0.77%
% PWS
> 1/2 HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
> 1/2 HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
> 1/2 HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
"% > HAL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HAL.
The Health Advisory Limit (HAL) for m-Dichlorobenzene is 600 [ig/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                 Occurrence of Unregulated Contaminants in Public Water Systems
Table A.32.a URCIS (Round 1) Data- m-Xylene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
73
131
1
940

14
1
13
57
1,163
30
265

183
524

3
978

66
71
53
462
297
16
7
1,490
590

257
2,655

303
13



992
129
1

1 1 ,778

1 1 ,329
GWPWS
46
93
1
873

10
0
11
26
1,054
26
246

154
291

3
935

55
57
53
427
254
16
7
1,465
555

168
2,492

156
13



937
60
0

10,484

10,145
SWPWS
28
42
0
103

5
1
2
39
109
5
19

30
233

0
43

11
14
0
48
44
0
0
25
35

106
167

147
0



77
70
1

1,404

1,276
% PWS >
MRL
2.74%
14.50%
100.00%
0.21 %

28.57%
0.00%
0.00%
7.02%
0.17%
0.00%
0.38%

1 .64%
0.76%

100.00%
0.00%

0.00%
1 .41 %
100.00%
2.16%
8.42%
100.00%
100.00%
1 .21 %
0.68%

1 .56%
2.11%

2.97%
1



1 .71 %
0.00%
0.00%

2.36%

1 .55%
%GW
PWS>
MRL
2.17%
16.13%
100.00%
0.23%

20.00%
0.00%
0.00%
15.38%
0.19%
0.00%
0.41 %

1 .95%
0.69%

100.00%
0.00%

0.00%
1 .75%
100.00%
1 .87%
9.45%
100.00%
100.00%
1 .23%
0.72%

1.19%
2.09%

1 .28%
1



1.17%
0.00%
0.00%

2.36%

1 .47%
%sw
PWS>
MRL
3.57%
9.52%
0.00%
0.00%

40.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.86%

0.00%
0.00%

0.00%
0.00%
0.00%
4.17%
2.27%
0.00%
0.00%
0.00%
0.00%

1 .89%
2.40%

4.76%
0



7.79%
0.00%
0.00%

2.21 %

2.12%
% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level
(HRL), Maximum Contaminant
Level (MCL), or Health Advisory
Level (HAL) for m-Xylene.




























































99%
VALUE
(M9/L)
< 0.00
7.40
7.50
< 5.00

51.47
< 0.50
< 0.50
2.00
< 0.50
< 0.30
< 1.00

< 1.00
< 1.00

7.50
< 0.50

< 0.50
9.00
27.00
1.20
4.10
19.20
31.60
< 1.00
< 5.00

< 1.00
< 2.00

< 0.50
83.00



< 0.50
< 4.00
< 1.00

< 5.00

< 4.00
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.32.b URCIS (Round 1) Data- m-Xylene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
73
131
1
940

14
1
13
57
1,163
30
265

183
524

3
978

66
71
53
462
297
16
7
1,490
590

257
2,655

303
13



992
129
1

1 1 ,778

1 1 ,329
TOTAL #
SAMPLES
331
351
2
2,909

39
46
333
79
2,464
72
378

1,075
2,311

5
1,581

97
226
77
983
644
19
9
3,099
1,595

1,446
16,040

1,220
14



3,987
351
3

41 ,786

39,570
#GW
SAMPLES
281
244
2
2,265

34
0
189
35
1,866
44
333

810
1,172

5
1,274

86
200
77
817
569
19
9
2,744
1,475

996
15,120

433
14



3,656
134
0

34,903

33,358
#SW
SAMPLES
50
107
0
644

5
46
144
44
598
28
45

265
1,139

0
307

11
26
0
166
75
0
0
355
120

450
920

787
0



331
217
3

6,883

6,212
% TOTAL
SAMPLES
>MRL
0.60%
7.12%
100.00%
0.07%

10.26%
0.00%
0.00%
5.06%
0.12%
0.00%
0.26%

0.47%
0.30%

100.00%
0.00%

0.00%
3.10%
100.00%
1 .93%
4.50%
100.00%
100.00%
0.65%
0.75%

0.35%
0.47%

0.74%
100.00%



0.60%
0.00%
0.00%

0.91 %

0.60%
%GW
SAMPLES
>MRL
0.36%
8.20%
100.00%
0.09%

5.88%
0.00%
0.00%
1 1 .43%
0.16%
0.00%
0.30%

0.62%
0.17%

100.00%
0.00%

0.00%
3.50%
100.00%
2.08%
4.92%
100.00%
100.00%
0.73%
0.81 %

0.20%
0.46%

0.46%
100.00%



0.46%
0.00%
0.00%

0.98%

0.61%
%SW
SAMPLES
>MRL
2.00%
4.67%
0.00%
0.00%

40.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.44%

0.00%
0.00%

0.00%
0.00%
0.00%
1 .20%
1 .33%
0.00%
0.00%
0.00%
0.00%

0.67%
0.54%

0.89%
0.00%



2.11%
0.00%
0.00%

0.55%

0.53%
MIN VALUE
(M9/L)
< 0.00
< 0.50
2.4
< 0.05

< 0.00
< 0.50
< 0.20
< 0.00
< 0.50
< 0.30
< 0.20

< 0.10
< 0.50

0.30
< 0.50

< 0.50
< 0.20
0.50
< 0.50
< 0.50
0.30
1.29
< 0.00
< 0.00

< 0.10
< 0.00

< 0.01
1.60



< 0.50
< 0.50
< 1.00

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
7.40
7.5
< 5.00

51.47
< 0.50
< 0.50
2.00
< 0.50
< 0.30
< 1.00

< 1.00
< 1.00

7.50
< 0.50

< 0.50
9.00
27.00
1.20
4.10
19.20
31.60
< 1.00
< 5.00

< 1.00
< 2.00

< 0.50
83.00



< 0.50
< 4.00
< 1.00

< 5.00

< 4.00
MAX
VALUE
(M9/L)
7.90
19.00
7.5
3.00

51.47
< 0.50
< 0.50
2.00
13.20
< 0.30
0.50

1.20
44.00

7.50
< 0.50

< 0.50
10.00
27.00
5.03
24.10
19.20
31.60
310.00
9.60

4.10
27.30

6.90
83.00



61.00
< 4.00
< 1.00

310.00

310.00
MIN
DETECTS
(M9/L)
2.40
0.60
2.40
0.05

0.10


1.00
0.80

0.50

0.27
1.00

0.30



7.00
0.50
0.60
0.57
0.30
1.29
0.08
0.40

0.50
0.30

0.60
1.60



0.50



0.05

0.05
MEDIAN
DETECTS
(M9/L)
5.15
1.20
4.95
1.53

2.77


1.75
0.90

0.50

1.14
1.30

0.40



9.00
1.10
1.20
1.40
0.90
2.39
0.74
1.50

0.80
1.10

1.20
2.55



1.20



1.20

1.20
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.32.C  URCIS (Round 1) Data- m-Xylene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
331
351
2
2,909

39
46
333
79
2,464
72
378

1,075
2,311

5
1,581

97
226
77
983
644
19
9
3,099
1,595

1,446
16,040

1,220
14



3,987
351
3

41 ,786

39,570
TOTAL
UNIQUE
PWS
73
131
1
940

14
1
13
57
1,163
30
265

183
524

3
978

66
71
53
462
297
16
7
1,490
590

257
2,655

303
13



992
129
1

11,778

1 1 ,329
#GW
PWS
46
93
1
873

10
0
11
26
1,054
26
246

154
291

3
935

55
57
53
427
254
16
7
1,465
555

168
2,492

156
13



937
60
0

10,484

10,145
#SW
PWS
28
42
0
103

5
1
2
39
109
5
19

30
233

0
43

11
14
0
48
44
0
0
25
35

106
167

147
0



77
70
1

1,404

1,276
% PWS
>MRL
2.74%
14.50%
100.00%
0.21%

28.57%
0.00%
0.00%
7.02%
0.17%
0.00%
0.38%

1.64%
0.76%

100.00%
0.00%

0.00%
1.41%
100.00%
2.16%
8.42%
100.00%
100.00%
1.21%
0.68%

1.56%
2.11%

2.97%
100.00%



1.71%
0.00%
0.00%

2.36%

1 .55%
%GW
PWS
>MRL
2.17%
16.13%
100.00%
0.23%

20.00%
0.00%
0.00%
15.38%
0.19%
0.00%
0.41%

1.95%
0.69%

100.00%
0.00%

0.00%
1.75%
100.00%
1.87%
9.45%
100.00%
100.00%
1.23%
0.72%

1.19%
2.09%

1.28%
100.00%



1.17%
0.00%
0.00%

2.36%

1 .47%
%SW
PWS
>MRL
3.57%
9.52%
0.00%
0.00%

40.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.86%

0.00%
0.00%

0.00%
0.00%
0.00%
4.17%
2.27%
0.00%
0.00%
0.00%
0.00%

1.89%
2.40%

4.76%
0.00%



7.79%
0.00%
0.00%

2.21%

2.12%
% PWS
>1/2MCL

















%GW
PWS
> 1/2 MCL

















%SW
PWS
> 1/2 MCL

















% PWS
>MCL

















I here is no Health Keterence Level (
%GW
PWS
>MCL

















%sw
PWS
>MCL

















HKL), Maximum
Contaminant Level (MCL), or Health Advisory Level (HAL) for
m-Xvlene.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                 Occurrence of Unregulated Contaminants in Public Water Systems
Table A.33.a URCIS (Round 1) Data- n-Butylbenzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
671
131

448
146
5
1
10

1,162


214
357
524
13

983

1,553
85


297
1
1
790
590
8
357
2,654
335
303
1
411
3

992
57
145

13,248

12,763
GWPWS
545
93

407
134
3
0
8

1,053


150
321
291
9

936

1,529
71


254
1
1
779
555
7
253
2,492
306
156
1
391
0

937
26
116

1 1 ,825

1 1 ,471
SWPWS
131
42

47
18
3
1
2

109


64
37
233
4

50

28
14


44
0
0
11
35
2
123
166
29
147
0
34
3

77
31
38

1,523

1,371
% PWS >
MRL
1 .04%
0.76%

0.89%
2.74%
0.00%
0.00%
0.00%

0.00%


0.93%
0.00%
0.00%
0.00%

0.10%

0.06%
0.00%


0.34%
100.00%
100.00%
0.38%
0.00%
0.00%
0.56%
0.11%
0.60%
2.64%
1
1 .46%
0.00%

0.10%
0.00%
0.69%

0.38%

0.35%
%GW
PWS>
MRL
1 .28%
0.00%

0.74%
2.99%
0.00%
0.00%
0.00%

0.00%


0.67%
0.00%
0.00%
0.00%

0.11%

0.07%
0.00%


0.39%
100.00%
100.00%
0.39%
0.00%
0.00%
0.40%
0.12%
0.65%
0.00%
1
1 .28%
0.00%

0.11%
0.00%
0.86%

0.31 %

0.29%
%sw
PWS>
MRL
0.00%
2.38%

2.13%
0.00%
0.00%
0.00%
0.00%

0.00%


1 .56%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.81 %
0.00%
0.00%
5.44%
0
2.94%
0.00%

0.00%
0.00%
0.00%

0.85%

0.88%
% PWS >
MCL

















%GW
PWS>
MCL

















%SW
PWS>
MCL

















There is no Health Reference Level
(HRL), Maximum Contaminant
Level (MCL), or Health Advisory
Level (HAL) for
n-Butyl benzene.




























































99%
VALUE
(M9/L)
< 0.00
< 0.50

< 2.00
< 0.50
< 0.58
< 0.50
< 0.40

< 0.50


< 2.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00


< 0.50
1.40
1.10
< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50
2.00
< 10.00
< 1.00

< 0.50
< 4.00
< 1.00

< 2.00

< 2.00
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.33.b URCIS (Round 1) Data- n-Butylbenzene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
671
131

448
146
5
1
10

1,162


214
357
524
13

983

1,553
85


297
1
1
790
590
8
357
2,654
335
303
1
411
3

992
57
145

13,248

12,763
TOTAL #
SAMPLES
1,766
351

1,098
1,112
8
47
53

2,462


729
1,889
2,311
22

1,749

2,657
323


644
2
2
1,615
1,595
148
2,087
15,981
444
1,221
1
1,233
10

3,987
170
313

46,030

43,327
#GW
SAMPLES
1,496
244

935
1,061
5
0
44

1,863


486
1,486
1,172
18

1,375

2,589
297


569
2
2
1,428
1,475
136
1,556
15,070
363
434
1
1,129
0

3,656
64
259

39,215

37,154
#SW
SAMPLES
270
107

163
51
3
47
9

599


243
403
1,139
4

374

68
26


75
0
0
187
120
12
531
911
81
787
0
104
10

331
106
54

6,815

6,173
% TOTAL
SAMPLES
>MRL
0.45%
0.28%

0.64%
0.45%
0.00%
0.00%
0.00%

0.00%


0.27%
0.00%
0.00%
0.00%

0.06%

0.04%
0.00%


0.16%
100.00%
100.00%
0.19%
0.00%
0.00%
0.10%
0.03%
0.45%
0.66%
100.00%
0.81%
0.00%

0.03%
0.00%
0.32%

0.13%

0.13%
%GW
SAMPLES
>MRL
0.53%
0.00%

0.32%
0.47%
0.00%
0.00%
0.00%

0.00%


0.21%
0.00%
0.00%
0.00%

0.07%

0.04%
0.00%


0.18%
100.00%
100.00%
0.21%
0.00%
0.00%
0.06%
0.03%
0.55%
0.00%
100.00%
0.80%
0.00%

0.03%
0.00%
0.39%

0.12%

0.11%
%SW
SAMPLES
>MRL
0.00%
0.93%

2.45%
0.00%
0.00%
0.00%
0.00%

0.00%


0.41 %
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.19%
0.00%
0.00%
1 .02%
0.00%
0.96%
0.00%

0.00%
0.00%
0.00%

0.23%

0.24%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.11
< 0.50
< 0.40

< 0.50


< 0.03
< 0.07
< 0.50
< 0.50

< 0.10

< 0.50
< 0.20


< 0.50
0.60
0.97
< 0.00
< 0.00
< 0.20
< 0.10
< 0.20
< 0.15
< 0.02
2.00
< 0.10
< 1.00

< 0.50
< 0.50
< 0.10

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
< 0.50

< 2.00
< 0.50
< 0.58
< 0.50
< 0.40

< 0.50


< 2.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00


< 0.50
1.40
1.10
< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50
2.00
< 10.00
< 1.00

< 0.50
< 4.00
< 1.00

< 2.00

< 2.00
MAX
VALUE
(M9/L)
3.40
1.70

10.00
11.40
< 0.58
< 0.50
< 0.40

< 0.50


1.40
< 5.00
< 1.00
< 0.50

0.10

0.90
< 2.00


1.10
1.40
1.10
1.00
< 5.00
< 0.20
5.00
6.00
0.22
11.10
2.00
1.00
< 1.00

0.60
< 4.00
0.10

11.40

11.40
MIN
DETECTS
(M9/L)
0.10
1.70

0.05
0.50







0.03




0.10

0.90



1.10
0.60
0.97
0.02


0.70
1.00
0.15
0.50
2.00
0.10


0.60

0.10

0.02

0.02
MEDIAN
DETECTS
(M9/L)
0.35
1.70

10.00
4.40







0.72




0.10

0.90



1.10
1.00
1.04
0.02


2.85
1.00
0.19
1.15
2.00
0.10


0.60

0.10

0.80

0.70
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.33.C URCIS (Round 1) Data- n-Butylbenzene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,766
351

1,098
1,112
8
47
53

2,462


729
1,889
2,311
22

1,749

2,657
323


644
2
2
1,615
1,595
148
2,087
15,981
444
1,221
1
1,233
10

3,987
170
313

46,030

43,327
TOTAL
UNIQUE
PWS
671
131

448
146
5
1
10

1,162


214
357
524
13

983

1,553
85


297
1
1
790
590
8
357
2,654
335
303
1
411
3

992
57
145

13,248

12,763
# GW PWS
545
93

407
134
3
0
8

1,053


150
321
291
9

936

1,529
71


254
1
1
779
555
7
253
2,492
306
156
1
391
0

937
26
116

1 1 ,825

11,471
# SW PWS
131
42

47
18
3
1
2

109


64
37
233
4

50

28
14


44
0
0
11
35
2
123
166
29
147
0
34
3

77
31
38

1,523

1,371
% PWS
>MRL
1.04%
0.76%

0.89%
2.74%
0.00%
0.00%
0.00%

0.00%


0.93%
0.00%
0.00%
0.00%

0.10%

0.06%
0.00%


0.34%
100.00%
100.00%
0.38%
0.00%
0.00%
0.56%
0.11%
0.60%
2.64%
100.00%
1.46%
0.00%

0.10%
0.00%
0.69%

0.38%

0.35%
%GW
PWS
>MRL
1 .28%
0.00%

0.74%
2.99%
0.00%
0.00%
0.00%

0.00%


0.67%
0.00%
0.00%
0.00%

0.11%

0.07%
0.00%


0.39%
100.00%
100.00%
0.39%
0.00%
0.00%
0.40%
0.12%
0.65%
0.00%
100.00%
1 .28%
0.00%

0.11%
0.00%
0.86%

0.31%

0.29%
%SW
PWS
>MRL
0.00%
2.38%

2.13%
0.00%
0.00%
0.00%
0.00%

0.00%


1.56%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.81%
0.00%
0.00%
5.44%
0.00%
2.94%
0.00%

0.00%
0.00%
0.00%

0.85%

0.88%
% PWS
> 1/2 MCL

















%GW
PWS
> 1/2 MCL

















%SW
PWS
> 1/2 MCL

















% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level (HRL), Maximum Contaminant
Level (MCL), or Health Advisory Level (HAL) for n-Butylbenzene.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for labors
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                 Occurrence of Unregulated Contaminants in Public Water Systems
Table A.34.a URCIS (Round 1) Data- n-Propylbenzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
671
131

427
145
5
1
10

1,161


214
357
524
13

983

1,553
79
2

297
1
1
795
590
8
357
2,655
335
303
1
411
3

992
35
145

13,205

12,724
GWPWS
545
93

388
132
3
0
8

1,052


150
321
291
9

936

1,529
65
2

254
1
1
784
555
7
253
2,492
306
156
0
391
0

937
12
116

1 1 ,789

1 1 ,440
SWPWS
131
42

45
19
3
1
2

109


64
37
233
4

50

28
14
0

44
0
0
11
35
2
123
167
29
147
1
34
3

77
23
38

1,516

1,363
% PWS >
MRL
1 .34%
1 .53%

0.70%
0.69%
0.00%
0.00%
0.00%

0.00%


0.47%
0.28%
0.38%
0.00%

0.00%

0.00%
0.00%
100.00%

0.34%
100.00%
100.00%
0.38%
0.00%
0.00%
0.28%
0.19%
0.30%
0.66%
1
1 .95%
0.00%

0.10%
0.00%
1 .38%

0.36%

0.33%
%GW
PWS>
MRL
1 .47%
2.15%

0.52%
0.76%
0.00%
0.00%
0.00%

0.00%


0.67%
0.31 %
0.69%
0.00%

0.00%

0.00%
0.00%
100.00%

0.39%
100.00%
100.00%
0.38%
0.00%
0.00%
0.00%
0.20%
0.33%
1 .28%
0
1 .79%
0.00%

0.11%
0.00%
1 .72%

0.36%

0.34%
%sw
PWS>
MRL
0.76%
0.00%

2.22%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.81 %
0.00%
0.00%
0.00%
1
2.94%
0.00%

0.00%
0.00%
0.00%

0.33%

0.22%
% PWS >
MCL

















%GW
PWS>
MCL

















%SW
PWS>
MCL

















There is no Health Reference Level
(HRL), Maximum Contaminant
Level (MCL), or Health Advisory
Level (HAL) for
n-Propylbenzene.




























































99%
VALUE
(M9/L)
< 0.00
0.42

< 2.00
< 0.50
< 0.55
< 0.50
< 0.40

< 0.50


< 2.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00
2.90

< 0.50
3.20
1.00
< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50
1.90
0.10
< 1.00

< 0.50
< 4.00
< 1.00

< 2.00

< 2.00
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.34.b URCIS (Round 1) Data- n-Propylbenzene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
671
131

427
145
5
1
10

1,161


214
357
524
13

983

1,553
79
2

297
1
1
795
590
8
357
2,655
335
303
1
411
3

992
35
145

13,205

12,724
TOTAL #
SAMPLES
1,766
352

1,038
1,118
8
48
53

2,462


725
1,889
2,311
22

1,749

2,657
277
2

644
2
2
1,623
1,595
148
2,098
16,086
444
1,220
1
1,234
10

3,987
132
313

46,016

43,345
#GW
SAMPLES
1,495
245

892
1,066
5
0
44

1,863


484
1,486
1,172
18

1,375

2,589
251
2

569
2
2
1,437
1,475
136
1,564
15,167
363
433
0
1,129
0

3,656
39
259

39,218

37,194
#SW
SAMPLES
271
107

146
52
3
48
9

599


241
403
1,139
4

374

68
26
0

75
0
0
186
120
12
534
919
81
787
1
105
10

331
93
54

6,798

6,151
% TOTAL
SAMPLES
>MRL
0.57%
1.14%

0.39%
0.63%
0.00%
0.00%
0.00%

0.00%


0.55%
0.11%
0.09%
0.00%

0.00%

0.00%
0.00%
100.00%

0.16%
100.00%
100.00%
0.18%
0.00%
0.00%
0.05%
0.03%
0.23%
0.16%
100.00%
1 .05%
0.00%

0.03%
0.00%
0.64%

0.15%

0.14%
%GW
SAMPLES
>MRL
0.60%
1 .63%

0.22%
0.66%
0.00%
0.00%
0.00%

0.00%


0.83%
0.13%
0.17%
0.00%

0.00%

0.00%
0.00%
100.00%

0.18%
100.00%
100.00%
0.21%
0.00%
0.00%
0.00%
0.03%
0.28%
0.46%
0.00%
1 .06%
0.00%

0.03%
0.00%
0.77%

0.16%

0.15%
%SW
SAMPLES
>MRL
0.37%
0.00%

1 .37%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.19%
0.00%
0.00%
0.00%
100.00%
0.95%
0.00%

0.00%
0.00%
0.00%

0.09%

0.07%
MIN VALUE
< 0.00
< 0.42

< 0.10
< 0.00
< 0.04
< 0.50
< 0.30

< 0.50


< 0.06
< 0.10
< 0.50
< 0.50

< 0.20

< 0.20
< 0.20
0.50

< 0.50
2.20
0.68
< 0.00
< 0.00
< 0.20
< 0.04
< 0.20
< 0.49
< 0.00
1.90
< 0.00
< 1.00

< 0.50
< 0.50
< 0.20

< 0.00

< 0.00
99% VALUE
< 0.00
0.42

< 2.00
< 0.50
< 0.55
< 0.50
< 0.40

< 0.50


< 2.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00
2.90

< 0.50
3.20
1.00
< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50
1.90
0.10
< 1.00

< 0.50
< 4.00
< 1.00

< 2.00

< 2.00
MAX
VALUE
12.00
0.90

10.00
34.00
< 0.55
< 0.50
< 0.40

< 0.50


0.15
1.00
7.00
< 0.50

< 1.00

< 5.00
< 2.00
2.90

1.80
3.20
1.00
1.00
< 5.00
< 0.20
0.37
2.29
0.49
0.70
1.90
1.00
< 1.00

1.40
< 4.00
0.80

34.00

34.00
MIN
DETECTS
0.30
0.42

0.50
0.55







0.06
1.00
2.00






0.50

1.80
2.20
0.68
0.03


0.37
1.00
0.49
0.60
1.90
0.10


1.40

0.20

0.03

0.03
MEDIAN
DETECTS
0.65
0.75

5.40
2.00







0.15
1.00
4.50






1.70

1.80
2.70
0.84
0.03


0.37
1.70
0.49
0.65
1.90
0.10


1.40

0.50

0.80

0.70
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.34.C URCIS (Round 1) Data- n-Propylbenzene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,766
352

1,038
1,118
8
48
53

2,462


725
1,889
2,311
22

1,749

2,657
277
2

644
2
2
1,623
1,595
148
2,098
16,086
444
1,220
1
1,234
10

3,987
132
313

46,016

43,345
TOTAL
UNIQUE
PWS
671
131

427
145
5
1
10

1,161


214
357
524
13

983

1,553
79
2

297
1
1
795
590
8
357
2,655
335
303
1
411
3

992
35
145

13,205

12,724
GWPWS
545
93

388
132
3
0
8

1,052


150
321
291
9

936

1,529
65
2

254
1
1
784
555
7
253
2,492
306
156
0
391
0

937
12
116

1 1 ,789

1 1 ,440
SWPWS
131
42

45
19
3
1
2

109


64
37
233
4

50

28
14
0

44
0
0
11
35
2
123
167
29
147
1
34
3

77
23
38

1,516

1,363
% PWS
>MRL
1.34%
1.53%

0.70%
0.69%
0.00%
0.00%
0.00%

0.00%


0.47%
0.28%
0.38%
0.00%

0.00%

0.00%
0.00%
100.00%

0.34%
100.00%
100.00%
0.38%
0.00%
0.00%
0.28%
0.19%
0.30%
0.66%
100.00%
1.95%
0.00%

0.10%
0.00%
1.38%

0.36%

0.33%
%GW
PWS
>MRL
1 .47%
2.15%

0.52%
0.76%
0.00%
0.00%
0.00%

0.00%


0.67%
0.31%
0.69%
0.00%

0.00%

0.00%
0.00%
100.00%

0.39%
100.00%
100.00%
0.38%
0.00%
0.00%
0.00%
0.20%
0.33%
1 .28%
0.00%
1 .79%
0.00%

0.11%
0.00%
1 .72%

0.36%

0.34%
%SW
PWS
>MRL
0.76%
0.00%

2.22%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.81%
0.00%
0.00%
0.00%
100.00%
2.94%
0.00%

0.00%
0.00%
0.00%

0.33%

0.22%
% PWS
> 1/2 MCL

















%GW
PWS
> 1/2 MCL

















%SW
PWS
> 1/2 MCL

















% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level (HRL), Maximum Contaminant
Level (MCL), or Health Advisory Level (HAL) for n-Propylbenzene.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for labors
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.35.a URCIS (Round 1) Data- Napthalene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
669
131

448
609
7
1
10
114
1,161
127

214
357
524
13
2
983

1,553
85
2

297
9
1
783
590
8
261
2,651
335
303
3
409
3

992
57
145

13,857

13,452
#GW
PWS
543
93

407
592
3
0
8
8
1,052
112

150
321
291
9
1
936

1,529
71
2

254
9
1
772
555
7
187
2,489
306
156
2
389
0

937
26
116

12,334

12,034
# SW PWS
131
42

47
27
5
1
2
106
109
16

64
37
233
4
1
50

28
14
0

44
0
0
11
35
2
85
166
29
147
1
34
3

77
31
38

1,620

1,502
% PWS
>MRL
4.78%
28.24%

1.12%
1.15%
14.29%
0.00%
0.00%
7.02%
0.00%
0.00%

1 .87%
0.28%
1.15%
0.00%
100.00%
0.51%

0.06%
0.00%
100.00%

0.34%
100.00%
100.00%
1 .02%
0.00%
12.50%
0.38%
0.68%
2.39%
0.99%
100.00%
1 .96%
0.00%

0.20%
0.00%
3.45%

1 .29%

1.18%
%GW
PWS
>MRL
5.52%
32.26%

0.98%
1.18%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

2.00%
0.31%
1 .03%
0.00%
100.00%
0.53%

0.07%
0.00%
100.00%

0.39%
100.00%
100.00%
1 .04%
0.00%
14.29%
0.00%
0.68%
2.29%
0.64%
100.00%
1 .80%
0.00%

0.21%
0.00%
2.59%

1.18%

1 .08%
%sw
PWS
>MRL
1 .53%
16.67%

2.13%
0.00%
20.00%
0.00%
0.00%
7.55%
0.00%
0.00%

1 .56%
0.00%
1 .29%
0.00%
100.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1.18%
0.60%
3.45%
1 .36%
100.00%
2.94%
0.00%

0.00%
0.00%
5.26%

2.04%

1 .93%
% PWS
>HRL
0.00%
1 .53%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.01%

0.01%
%GW
PWS
>HRL
0.00%
2.15%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.02%

0.02%
%sw
PWS
>HRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
99%
VALUE
(M9/L)
0.80
8.20

< 5.00
< 10.00
4.62
< 0.50
< 0.60
8.00
< 0.50
< 0.30

< 2.00
< 2.00
< 1.00
< 0.50
0.80
< 0.50

< 0.50
< 50.00
14.80

< 0.50
10.60
0.97
< 2.00
< 1.00
< 0.20
< 5.00
< 2.00
0.18
< 0.50
18.00
< 10.00
< 1.00

< 0.50
< 4.00
0.80

< 5.00

< 5.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work as
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Naphthalene is 140 |jg/L. This is a draft value for working review only.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.35.b URCIS (Round 1) Data- Na
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
669
131

448
609
7
1
10
114
1,161
127

214
357
524
13
2
983

1,553
85
2

297
9
1
783
590
8
261
2,651
335
303
3
409
3

992
57
145

13,857

13,452
TOTAL #
SAMPLES
1,763
354

1,099
2,284
11
48
53
129
2,461
1,221

730
1,889
2,076
22
2
1,749

2,656
323
7

644
16
1
1,604
1,595
148
1,388
15,944
444
1,220
5
1,236
10

3,987
169
313

47,601

45,567
#GW
SAMPLES
1,494
247

935
2,167
5
0
44
12
1,862
1,081

486
1,486
1,119
18
1
1,375

2,588
297
7

569
16
1
1,417
1,475
136
1,020
15,030
363
433
3
1,127
0

3,656
64
259

40,793

39,245
pthalene Occurrence in Public Water Systems- Based on Number of Samples
#sw
SAMPLES
269
107

164
117
6
48
9
117
599
140

244
403
957
4
1
374

68
26
0

75
0
0
187
120
12
368
914
81
787
2
109
10

331
105
54

6,808

6,322
% TOTAL
SAMPLES
>MRL
2.10%
12.15%

0.73%
0.79%
9.09%
0.00%
0.00%
6.20%
0.00%
0.00%

0.55%
0.05%
0.48%
0.00%
100.00%
0.29%

0.04%
0.00%
100.00%

0.16%
100.00%
100.00%
0.50%
0.00%
0.68%
0.07%
0.12%
1.80%
0.25%
100.00%
0.97%
0.00%

0.13%
0.00%
1.92%

0.49%

0.43%
%GW
SAMPLES
>MRL
2.34%
14.17%

0.43%
0.83%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.62%
0.07%
0.27%
0.00%
100.00%
0.36%

0.04%
0.00%
100.00%

0.18%
100.00%
100.00%
0.56%
0.00%
0.74%
0.00%
0.12%
1.93%
0.23%
100.00%
0.98%
0.00%

0.14%
0.00%
1.16%

0.00%

0.00%
%SW
SAMPLES
>MRL
0.74%
7.48%

2.44%
0.00%
16.67%
0.00%
0.00%
6.84%
0.00%
0.00%

0.41 %
0.00%
0.73%
0.00%
100.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.27%
0.11%
1.23%
0.25%
100.00%
0.92%
0.00%

0.00%
0.00%
5.56%

0.63%

0.60%
MIN
VALUE
fog/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.00
< 0.50
< 0.30
< 0.00
< 0.50
< 0.00

< 0.02
< 0.10
< 0.50
< 0.50
0.50
< 0.20

< 0.50
< 0.20
0.50

< 0.50
0.40
0.97
< 0.00
< 0.00
< 0.20
< 0.04
< 0.00
< 0.15
< 0.06
1.80
< 0.10
< 1.00

< 0.50
< 0.50
< 0.10

< 0.00

< 0.00
99%
VALUE
(Mg/L)
0.80
8.20

< 5.00
< 10.00
4.62
< 0.50
< 0.60
8.00
< 0.50
< 0.30

< 2.00
< 2.00
< 1.00
< 0.50
0.80
< 0.50

< 0.50
< 50.00
14.80

< 0.50
10.60
0.97
< 2.00
< 1.00
< 0.20
< 5.00
< 2.00
0.18
< 0.50
18.00
< 10.00
< 1.00

< 0.50
< 4.00
0.80

< 5.00

< 5.00
MAX
VALUE
(Mg/L)
13.10
906.00

10.00
25.00
4.62
< 0.50
< 0.60
10.00
< 0.50
< 0.30

13.00
2.00
17.00
< 0.50
0.80
7.00

1.70
< 50.00
14.80

2.25
10.60
0.97
1.50
< 5.00
0.40
0.60
19.00
0.45
3.80
18.00
6.00
< 1.00

3.10
< 4.00
2.80

906.00

906.00
MIN
DETECTS
(Mg/L)
0.28
0.50

0.05
0.60
4.62


1.00



0.05
2.00
1.00

0.50
0.60

1.70

0.50

2.25
0.40
0.97
0.03

0.40
0.60
0.50
0.15
0.70
1.80
0.50


1.50

0.30

0.03

0.03
MEDIAN
DETECTS
fog/L)
0.80
1.00

7.50
1.65
4.62


5.00



1.00
2.00
2.00

0.65
1.40

1.70

1.30

2.25
0.90
0.97
1.00

0.40
0.60
1.00
0.20
1.00
3.90
0.50


1.60

0.90

1.00

1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.35.C URCIS (Round 1) Data- Napthalene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL #
SAMPLES
1,212
224

855
1,201
10
1
18
122
2,213
239

364
678
815
22
3
1,919

3,082
156
4

551
18
2
1,555
1,145
15
448
5,140
641
459
5
798
3

1,929
83
261

26,191

25,486
TOTAL
UNIQUE
PWS
669
131

448
609
7
1
10
114
1,161
127

214
357
524
13
2
983

1,553
85
2

297
9
1
783
590
8
261
2,651
335
303
3
409
3

992
57
145

13,857

13,452
#GW
PWS
543
93

407
592
3
0
8
8
1,052
112

150
321
291
9
1
936

1,529
71
2

254
9
1
772
555
7
187
2,489
306
156
2
389
0

937
26
116

12,334

12,034
#SW
PWS
131
42

47
27
5
1
2
106
109
16

64
37
233
4
1
50

28
14
0

44
0
0
11
35
2
85
166
29
147
1
34
3

77
31
38

1,620

1,502
% PWS
>MRL
4.78%
28.24%

1.12%
1.15%
14.29%
0.00%
0.00%
7.02%
0.00%
0.00%

1.87%
0.28%
1.15%
0.00%
100.00%
0.51%

0.06%
0.00%
100.00%

0.34%
100.00%
100.00%
1.02%
0.00%
12.50%
0.38%
0.68%
2.39%
0.99%
100.00%
1.96%
0.00%

0.20%
0.00%
3.45%

1.29%

1.18%
%GW
PWS
>MRL
5.52%
32.26%

0.98%
1.18%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

2.00%
0.31 %
1 .03%
0.00%
100.00%
0.53%

0.07%
0.00%
100.00%

0.39%
100.00%
100.00%
1 .04%
0.00%
14.29%
0.00%
0.68%
2.29%
0.64%
100.00%
1 .80%
0.00%

0.21 %
0.00%
2.59%

1.18%

1 .08%
%sw
PWS
>MRL
1.53%
16.67%

2.13%
0.00%
20.00%
0.00%
0.00%
7.55%
0.00%
0.00%

1.56%
0.00%
1.29%
0.00%
100.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1.18%
0.60%
3.45%
1.36%
100.00%
2.94%
0.00%

0.00%
0.00%
5.26%

2.04%

1.93%
% PWS
> 1/2 HRL
0.00%
1 .53%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.01 %

0.01 %
%GW
PWS
> 1/2 HRL
0.00%
2.15%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.02%

0.02%
%sw
PWS
> 1/2 HRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>HRL
0.00%
1.53%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.01%

0.01%
%GW
PWS
>HRL
0.00%
2.15%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.02%

0.02%
%sw
PWS
>HRL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Naphthalene is 140 ug/L This is a draft value for working review only.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.36.a URCIS (Round 1) Data- o-Chlorotoluene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
679
131
1
938
148
10
1
13
108
1,162
127
805
258
365
524
13

983

1,552
85

565
297

1
1,505
590
8
355
2,656
335
303

419
3
1
992
134
145

16,212

15,721
GWPWS
548
93
1
869
135
8
0
11
30
1,053
112
766
185
327
291
9

936

1,528
71

523
254

1
1,480
555
7
251
2,493
306
156

399
0
1
937
62
116

14,514

14,154
SWPWS
136
42
0
105
19
3
1
2
87
109
16
39
73
39
233
4

50

28
14

57
44

0
25
35
2
123
167
29
147

34
3
0
77
73
38

1,854

1,702
% PWS >
MRL
0.44%
0.76%
100.00%
0.00%
0.68%
0.00%
0.00%
0.00%
2.78%
0.00%
0.00%
0.00%
0.39%
0.00%
0.57%
0.00%

0.20%

0.06%
1.18%

0.18%
0.67%

100.00%
0.33%
0.00%
0.00%
0.56%
0.11%
0.00%
0.00%

1 .43%
0.00%
100.00%
0.00%
0.00%
0.00%

0.23%

0.20%
%GW
PWS>
MRL
0.55%
0.00%
100.00%
0.00%
0.74%
0.00%
0.00%
0.00%
6.67%
0.00%
0.00%
0.00%
0.54%
0.00%
0.34%
0.00%

0.00%

0.00%
0.00%

0.00%
0.79%

100.00%
0.34%
0.00%
0.00%
0.40%
0.12%
0.00%
0.00%

1 .25%
0.00%
100.00%
0.00%
0.00%
0.00%

0.19%

0.16%
%sw
PWS>
MRL
0.00%
2.38%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1.15%
0.00%
0.00%
0.00%
0.00%
0.00%
0.86%
0.00%

4.00%

3.57%
7.14%

1 .75%
0.00%

0.00%
0.00%
0.00%
0.00%
0.81 %
0.00%
0.00%
0.00%

2.94%
0.00%
0.00%
0.00%
0.00%
0.00%

0.59%

0.53%
% PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
99% VALUE
(M9/L)
< 0.00
< 0.50
0.89
< 1.00
< 0.50
< 5.00
< 0.50
< 0.50
0.50
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00

< 1.00
< 0.50

1.50
< 1.34
< 1.00
< 0.20
< 1.00
< 1.00
< 0.50
< 0.50

< 5.00
< 1.00
0.50
< 0.50
< 4.00
< 0.60

< 1.00

< 1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for o-Chlorotoluene is 100 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.36.b URCIS (Round 1) Data- o-Chlorotoluene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
679
131
1
938
148
10
1
13
108
1,162
127
805
258
365
524
13

983

1,552
85

565
297

1
1,505
590
8
355
2,656
335
303

419
3
1
992
134
145

16,212

15,721
TOTAL #
SAMPLES
1,781
352
2
2,874
1,062
34
61
333
145
2,463
1,221
1,211
942
1,939
2,312
22

1,754

2,655
322

1,623
644

1
3,146
1,595
148
2,553
16,087
444
1,221

1,318
10
1
3,987
374
313

54,950

51 ,463
#GW
SAMPLES
1,486
244
2
2,233
1,010
31
0
189
48
1,864
1,081
1,035
628
1,514
1,172
18

1,380

2,587
296

1,376
569

1
2,780
1,475
136
1,873
15,167
363
434

1,206
0
1
3,656
149
259

46,263

43,716
#SW
SAMPLES
295
108
0
641
52
3
61
144
97
599
140
176
314
425
1,140
4

374

68
26

247
75

0
366
120
12
680
920
81
787

112
10
0
331
225
54

8,687

7,747
% TOTAL
SAMPLES
>MRL
0.17%
0.28%
100.00%
0.00%
0.09%
0.00%
0.00%
0.00%
2.07%
0.00%
0.00%
0.00%
0.32%
0.00%
0.13%
0.00%

0.11%

0.04%
0.31 %

0.06%
0.31 %

100.00%
0.29%
0.00%
0.00%
0.08%
0.02%
0.00%
0.00%

0.76%
0.00%
100.00%
0.00%
0.00%
0.00%

0.09%

0.08%
%GW
SAMPLES
>MRL
0.20%
0.00%
100.00%
0.00%
0.10%
0.00%
0.00%
0.00%
4.17%
0.00%
0.00%
0.00%
0.48%
0.00%
0.09%
0.00%

0.00%

0.00%
0.00%

0.00%
0.35%

100.00%
0.32%
0.00%
0.00%
0.05%
0.02%
0.00%
0.00%

0.75%
0.00%
100.00%
0.00%
0.00%
0.00%

0.08%

0.08%
%SW
SAMPLES
>MRL
0.00%
0.93%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .03%
0.00%
0.00%
0.00%
0.00%
0.00%
0.18%
0.00%

0.53%

1 .47%
3.85%

0.40%
0.00%

0.00%
0.00%
0.00%
0.00%
0.15%
0.00%
0.00%
0.00%

0.89%
0.00%
0.00%
0.00%
0.00%
0.00%

0.13%

0.12%
MIN VALUE
(M9/L)
< 0.00
< 0.50
0.30
< 0.10
< 0.00
< 0.00
< 0.50
< 0.50
< 0.00
< 0.50
< 0.00
< 0.30
< 0.06
< 0.08
< 0.50
< 0.50

< 0.20

< 0.20
< 0.20

< 0.50
< 0.50

1.50
< 0.00
< 0.00
< 0.20
< 0.04
< 0.00
< 0.50
< 0.01

< 0.10
< 1.00
0.50
< 0.50
< 0.00
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
< 0.50
0.89
< 1.00
< 0.50
< 5.00
< 0.50
< 0.50
0.50
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00

< 1.00
< 0.50

1.50
< 1.34
< 1.00
< 0.20
< 1.00
< 1.00
< 0.50
< 0.50

< 5.00
< 1.00
0.50
< 0.50
< 4.00
< 0.60

< 1.00

< 1.00
MAX
VALUE
(M9/L)
4.40
2.00
0.89
< 10.00
0.50
< 5.00
< 0.50
< 0.50
1.00
< 0.50
< 0.30
< 1.00
0.22
< 5.00
10.00
< 0.50

0.60

0.50
0.50

0.70
16.40

1.50
4.40
< 5.00
< 0.20
6.00
1.20
< 0.50
< 0.50

1.00
< 1.00
0.50
< 0.50
< 4.00
< 1.00

16.40

16.40
MIN
DETECTS
(M9/L)
0.30
2.00
0.30

0.50



0.20



0.06

2.60


0.40

0.50
0.50

0.70
1.10

1.50
0.12


0.39
1.00



0.10

0.50




0.06

0.06
MEDIAN
DETECTS
(M9/L)
0.30
2.00
0.60

0.50



0.50



0.22

3.00


0.50

0.50
0.50

0.70
8.75

1.50
0.57


3.20
1.00



0.10

0.50




0.57

0.57
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                               Occurrence of Unregulated Contaminants in Public Water Systems
Table A.36.C URCIS (Round 1 ) Data- o-Chlorotoluene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,781
352
2
2,874
1,062
34
61
333
145
2,463
1,221
1,211
942
1,939
2,312
22

1,754

2,655
322

1,623
644

1
3,146
1,595
148
2,553
16,087
444
1,221

1,318
10
1
3,987
374
313

54,950

51,463
TOTAL
UNIQUE
PWS
679
131
1
938
148
10
1
13
108
1,162
127
805
258
365
524
13

983

1,552
85

565
297

1
1,505
590
8
355
2,656
335
303

419
3
1
992
134
145

16,212

15,721
#GW
PWS
548
93
1
869
135
8
0
11
30
1,053
112
766
185
327
291
9

936

1,528
71

523
254

1
1,480
555
7
251
2,493
306
156

399
0
1
937
62
116

14,514

14,154
#SW
PWS
136
42
0
105
19
3
1
2
87
109
16
39
73
39
233
4

50

28
14

57
44

0
25
35
2
123
167
29
147

34
3
0
77
73
38

1,854

1,702
% PWS
>MRL
0.44%
0.76%
100.00%
0.00%
0.68%
0.00%
0.00%
0.00%
2.78%
0.00%
0.00%
0.00%
0.39%
0.00%
0.57%
0.00%

0.20%

0.06%
1.18%

0.18%
0.67%

100.00%
0.33%
0.00%
0.00%
0.56%
0.11%
0.00%
0.00%

1.43%
0.00%
100.00%
0.00%
0.00%
0.00%

0.23%

0.20%
%GW
PWS
>MRL
0.55%
0.00%
100.00%
0.00%
0.74%
0.00%
0.00%
0.00%
6.67%
0.00%
0.00%
0.00%
0.54%
0.00%
0.34%
0.00%

0.00%

0.00%
0.00%

0.00%
0.79%

100.00%
0.34%
0.00%
0.00%
0.40%
0.12%
0.00%
0.00%

1 .25%
0.00%
100.00%
0.00%
0.00%
0.00%

0.19%

0.16%
%sw
PWS
>MRL
0.00%
2.38%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1.15%
0.00%
0.00%
0.00%
0.00%
0.00%
0.86%
0.00%

4.00%

3.57%
7.14%

1.75%
0.00%

0.00%
0.00%
0.00%
0.00%
0.81%
0.00%
0.00%
0.00%

2.94%
0.00%
0.00%
0.00%
0.00%
0.00%

0.59%

0.53%
% PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the
The Maximum Contaminant Level (MCL) for o-Chlorotoluene is 100 ug/L
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.37.a URCIS (Round 1) Data- o-Dichlorobenzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
692
131

937
3,529
10
1
13
157
1,162
127
1,002
1,299
365
524
13

842

1,565
85

565
297
2

1,525
590
8
356
2,656

303

412
3
2
992
136
145

20,446

19,953
GWPWS
560
93

868
3,498
7
0
11
27
1,053
112
963
1,185
327
291
9

795

1,540
71

523
254
2

1,500
555
7
252
2,493

156

392
0
2
937
62
116

18,661

18,300
SWPWS
138
42

105
39
4
1
2
143
109
16
39
114
39
233
4

50

29
14

57
44
0

25
35
2
123
167

147

34
3
0
77
75
38

1,948

1,795
% PWS >
MRL
0.43%
1 .53%

0.11%
0.34%
0.00%
0.00%
7.69%
5.10%
0.00%
0.00%
0.10%
0.54%
0.27%
0.00%
0.00%

0.59%

0.06%
0.00%

0.00%
0.34%
100.00%

0.39%
0.00%
0.00%
0.28%
0.08%

0.00%

1 .21 %
0.00%
100.00%
0.00%
0.00%
0.00%

0.30%

0.28%
%GW
PWS>
MRL
0.36%
2.15%

0.12%
0.17%
0.00%
0.00%
9.09%
3.70%
0.00%
0.00%
0.10%
0.51 %
0.31 %
0.00%
0.00%

0.38%

0.06%
0.00%

0.00%
0.39%
100.00%

0.40%
0.00%
0.00%
0.00%
0.08%

0.00%

1 .02%
0.00%
100.00%
0.00%
0.00%
0.00%

0.23%

0.20%
%sw
PWS>
MRL
0.72%
0.00%

0.00%
15.38%
0.00%
0.00%
0.00%
4.90%
0.00%
0.00%
0.00%
0.88%
0.00%
0.00%
0.00%

4.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.81 %
0.00%

0.00%

2.94%
0.00%
0.00%
0.00%
0.00%
0.00%

0.98%

1 .00%
% PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
99% VALUE
(M9/L)
< 0.00
< 0.50

< 5.00
< 2.00
< 5.00
< 0.50
< 0.50
5.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50

< 0.50

< 1.00
< 2.00

< 1.00
< 0.50
0.50

< 1.00
< 1.00
< 0.20
< 1.00
< 2.00

< 0.50

< 5.00
< 1.00
0.60
< 0.50
< 4.00
< 0.60

< 5.00

< 5.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for o-Dichlorobenzene is 600 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.37.b URCIS (Round 1) Data- o-Dichlorobenzene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
692
131

937
3,529
10
1
13
157
1,162
127
1,002
1,299
365
524
13

842

1,565
85

565
297
2

1,525
590
8
356
2,656

303

412
3
2
992
136
145

20,446

19,953
TOTAL #
SAMPLES
1,833
351

2,878
1 1 ,784
34
62
333
215
2,461
1,221
1,907
5,269
1,943
2,311
22

1,633

2,754
322

1,624
644
2

3,215
1,595
148
2,566
16,084

1,221

1,270
10
3
3,987
387
313

70,402

66,900
#GW
SAMPLES
1,534
244

2,238
1 1 ,695
30
0
189
45
1,864
1,081
1,696
4,265
1,518
1,172
18

1,247

2,675
296

1,376
569
2

2,856
1,475
136
1,878
15,166

434

1,160
0
3
3,656
160
259

60,937

58,385
#SW
SAMPLES
299
107

640
89
4
62
144
170
597
140
211
1,004
425
1,139
4

386

79
26

248
75
0

359
120
12
688
918

787

110
10
0
331
227
54

9,465

8,515
% TOTAL
SAMPLES
>MRL
0.16%
0.57%

0.03%
0.16%
0.00%
0.00%
0.30%
4.65%
0.00%
0.00%
0.05%
0.46%
0.10%
0.00%
0.00%

0.49%

0.04%
0.00%

0.00%
0.31 %
100.00%

0.25%
0.00%
0.00%
0.04%
0.04%

0.00%

0.71%
0.00%
100.00%
0.00%
0.00%
0.00%

0.15%

0.14%
%GW
SAMPLES
>MRL
0.13%
0.82%

0.04%
0.11%
0.00%
0.00%
0.53%
6.67%
0.00%
0.00%
0.06%
0.54%
0.13%
0.00%
0.00%

0.40%

0.04%
0.00%

0.00%
0.35%
100.00%

0.28%
0.00%
0.00%
0.00%
0.04%

0.00%

0.69%
0.00%
100.00%
0.00%
0.00%
0.00%

0.14%

0.13%
%SW
SAMPLES
>MRL
0.33%
0.00%

0.00%
6.74%
0.00%
0.00%
0.00%
4.12%
0.00%
0.00%
0.00%
0.10%
0.00%
0.00%
0.00%

0.78%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.15%
0.00%

0.00%

0.91%
0.00%
0.00%
0.00%
0.00%
0.00%

0.21%

0.22%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.00
< 0.50
< 0.30
< 0.00
< 0.50
< 0.00
< 0.30
< 0.01
< 0.07
< 0.50
< 0.50

< 0.10

< 0.10
< 0.20

< 0.50
< 0.17
0.40

< 0.00
< 0.00
< 0.20
< 0.03
< 0.08

< 0.00

< 0.00
< 1.00
0.50
< 0.50
< 0.15
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
< 0.50

< 5.00
< 2.00
< 5.00
< 0.50
< 0.50
5.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50

< 0.50

< 1.00
< 2.00

< 1.00
< 0.50
0.50

< 1.00
< 1.00
< 0.20
< 1.00
< 2.00

< 0.50

< 5.00
< 1.00
0.60
< 0.50
< 4.00
< 0.60

< 5.00

< 5.00
MAX
VALUE
(M9/L)
0.60
2.00

3.00
2.00
< 5.00
< 0.50
0.40
10.00
< 0.50
< 0.30
1.00
180.00
0.60
< 1.00
< 0.50

39.60

0.50
< 2.00

< 1.00
0.20
0.50

8.30
< 5.00
< 0.20
6.36
2.00

< 0.50

2.90
< 1.00
0.60
< 0.50
< 4.00
< 1.00

180.00

180.00
MIN
DETECTS
(M9/L)
0.20
0.70

3.00
0.56


0.40
0.10


1.00
0.04
0.60



0.10

0.50



0.17
0.40

0.07


6.36
0.50



0.10

0.50




0.04

0.04
MEDIAN
DETECTS
(M9/L)
0.20
1.35

3.00
1.20


0.40
3.00


1.00
2.90
0.60



0.70

0.50



0.19
0.45

1.70


6.36
0.65



0.10

0.60




1.00

1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.37.C  URCIS (Round 1) Data- o-Dichlorobenzene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,833
351

2,878
11,784
34
62
333
215
2,461
1,221
1,907
5,269
1,943
2,311
22

1,633

2,754
322

1,624
644
2

3,215
1,595
148
2,566
16,084

1,221

1,270
10
3
3,987
387
313

70,402

66,900
TOTAL
UNIQUE
PWS
692
131

937
3,529
10
1
13
157
1,162
127
1,002
1,299
365
524
13

842

1,565
85

565
297
2

1,525
590
8
356
2,656

303

412
3
2
992
136
145

20,446

19,953
#GW
PWS
560
93

868
3,498
7
0
11
27
1,053
112
963
1,185
327
291
9

795

1,540
71

523
254
2

1,500
555
7
252
2,493

156

392
0
2
937
62
116

18,661

18,300
#SW
PWS
138
42

105
39
4
1
2
143
109
16
39
114
39
233
4

50

29
14

57
44
0

25
35
2
123
167

147

34
3
0
77
75
38

1,948

1,795
% PWS
>MRL
0.43%
1.53%

0.11%
0.34%
0.00%
0.00%
7.69%
5.10%
0.00%
0.00%
0.10%
0.54%
0.27%
0.00%
0.00%

0.59%

0.06%
0.00%

0.00%
0.34%
100.00%

0.39%
0.00%
0.00%
0.28%
0.08%

0.00%

1.21%
0.00%
100.00%
0.00%
0.00%
0.00%

0.30%

0.28%
%GW
PWS
>MRL
0.36%
2.15%

0.12%
0.17%
0.00%
0.00%
9.09%
3.70%
0.00%
0.00%
0.10%
0.51 %
0.31 %
0.00%
0.00%

0.38%

0.06%
0.00%

0.00%
0.39%
100.00%

0.40%
0.00%
0.00%
0.00%
0.08%

0.00%

1 .02%
0.00%
100.00%
0.00%
0.00%
0.00%

0.23%

0.20%
%sw
PWS
>MRL
0.72%
0.00%

0.00%
15.38%
0.00%
0.00%
0.00%
4.90%
0.00%
0.00%
0.00%
0.88%
0.00%
0.00%
0.00%

4.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.81%
0.00%

0.00%

2.94%
0.00%
0.00%
0.00%
0.00%
0.00%

0.98%

1.00%
% PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the
The Maximum Contaminant Level (MCL) for o-Dichlorobenzene is 600 ug/L
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                 Occurrence of Unregulated Contaminants in Public Water Systems
Table A.38.a URCIS (Round 1) Data- o-Xylene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
272
131
2
941
164
19
1
13
61
1,162
127
1,002
258
345
524
13
6
978

1,550
85
35
41
297
20

1,509
590
8
354
2,463

303
10

3
5
992
132
145

14,561

13,987
GWPWS
210
93
1
873
143
11
0
11
27
1,053
112
963
185
309
291
9
6
935

1,526
71
35
27
254
20

1,484
555
7
251
2,328

156
10

0
4
937
61
116

13,074

12,638
SWPWS
67
42
1
104
27
9
1
2
42
109
16
39
73
37
233
4
0
43

28
14
0
17
44
0

25
35
2
122
135

147
0

3
1
77
72
38

1,609

1,450
% PWS >
MRL
5.88%
15.27%
1
0.11%
6.71 %
47.37%
0.00%
7.69%
9.84%
0.52%
0.00%
2.20%
2.71 %
0.87%
2.67%
0.00%
100.00%
0.20%

2.32%
5.88%
100.00%
9.76%
5.72%
100.00%

1.19%
0.17%
12.50%
2.26%
1 .87%

0.99%
1

0.00%
60.00%
0.91 %
0.00%
2.76%

2.38%

1 .76%
%GW
PWS>
MRL
6.67%
16.13%
1
0.11%
4.20%
36.36%
0.00%
9.09%
18.52%
0.57%
0.00%
2.08%
3.78%
0.32%
2.75%
0.00%
100.00%
0.11%

2.23%
7.04%
100.00%
11.11%
6.30%
100.00%

1 .21 %
0.18%
14.29%
0.80%
1 .93%

0.64%
1

0.00%
75.00%
0.75%
0.00%
3.45%

2.30%

1 .69%
%sw
PWS>
MRL
5.97%
1 1 .90%
1
0.00%
18.52%
55.56%
0.00%
0.00%
2.38%
0.00%
0.00%
5.13%
0.00%
5.41 %
2.58%
0.00%
0.00%
2.33%

7.14%
0.00%
0.00%
5.88%
2.27%
0.00%

0.00%
0.00%
0.00%
4.92%
0.74%

1 .36%
0

0.00%
0.00%
2.60%
0.00%
0.00%

2.92%

2.41 %
% PWS >
MCL

















%GW
PWS>
MCL

















%SW
PWS>
MCL

















There is no Health Reference Level
(HRL), Maximum Contaminant
Level (MCL), or Health Advisory
Level (HAL) for o-Xylene.




























































99%
VALUE
(M9/L)
33.00
5.60
2.00
< 5.00
2.10
14.62
< 0.50
< 0.50
4.00
< 0.50
< 0.30
1.00
0.17
< 1.00
1.00
< 0.50
2.50
< 0.50

0.20
5.00
22.30
1.30
3.11
37.20

< 1.00
< 1.00
< 0.20
< 1.00
< 1.00

< 0.50
3.00

< 1.00
10.00
< 0.50
< 4.00
0.30

< 10.00

< 5.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.38.b URCIS (Round 1) Data- o-Xylene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
272
131
2
941
164
19
1
13
61
1,162
127
1,002
258
345
524
13
6
978

1,550
85
35
41
297
20

1,509
590
8
354
2,463

303
10

3
5
992
132
145

14,561

13,987
TOTAL #
SAMPLES
809
351
5
2,907
1,161
47
46
333
86
2,465
1,219
1,907
940
1,860
2,312
22
6
1,581

2,644
321
38
64
644
26

3,126
1,595
148
2,082
13,202

1,220
10

10
7
3,987
362
313

47,856

44,755
#GW
SAMPLES
673
244
2
2,261
1,088
34
0
189
41
1,866
1,079
1,696
627
1,454
1,172
18
6
1,274

2,577
295
38
37
569
26

2,771
1,475
136
1,557
12,757

433
10

0
6
3,656
143
259

40,469

38,152
#SW
SAMPLES
136
107
3
646
73
13
46
144
45
599
140
211
313
406
1,140
4
0
307

67
26
0
27
75
0

355
120
12
525
445

787
0

10
1
331
219
54

7,387

6,603
% TOTAL
SAMPLES
>MRL
3.46%
7.41%
100.00%
0.03%
1 .72%
25.53%
0.00%
0.30%
6.98%
0.37%
0.00%
1 .31 %
1.17%
0.38%
1 .08%
0.00%
100.00%
0.13%

1 .55%
1 .87%
100.00%
6.25%
3.26%
100.00%

0.83%
0.38%
0.68%
0.38%
0.48%

0.25%
100.00%

0.00%
57.14%
0.40%
0.00%
1 .28%

0.97%

0.77%
%GW
SAMPLES
>MRL
3.27%
8.61%
100.00%
0.04%
1 .38%
1 1 .76%
0.00%
0.53%
12.20%
0.48%
0.00%
1 .36%
1 .75%
0.28%
0.68%
0.00%
100.00%
0.08%

1 .47%
2.03%
100.00%
8.11%
3.51 %
100.00%

0.94%
0.41 %
0.74%
0.13%
0.49%

0.23%
100.00%

0.00%
66.67%
0.36%
0.00%
1 .54%

0.97%

0.77%
%SW
SAMPLES
>MRL
4.41 %
4.67%
100.00%
0.00%
6.85%
61 .54%
0.00%
0.00%
2.22%
0.00%
0.00%
0.95%
0.00%
0.74%
1 .49%
0.00%
0.00%
0.33%

4.48%
0.00%
0.00%
3.70%
1 .33%
0.00%

0.00%
0.00%
0.00%
1.14%
0.45%

0.25%
0.00%

0.00%
0.00%
0.91%
0.00%
0.00%

0.93%

0.79%
MIN VALUE
< 0.00
< 0.50
0.6
< 0.05
< 0.00
< 0.00
< 0.50
< 0.30
< 0.00
< 0.50
< 0.00
< 0.40
< 0.02
< 0.08
< 0.50
< 0.50
0.14
< 0.10

< 0.20
< 0.20
0.50
< 0.50
< 0.50
0.20

< 0.00
< 0.00
< 0.20
< 0.10
< 0.20

< 0.02
1.00

< 1.00
< 0.00
< 0.50
< 0.30
< 0.20

< 0.00

< 0.00
99% VALUE
33.00
5.60
2.00
< 5.00
2.10
14.62
< 0.50
< 0.50
4.00
< 0.50
< 0.30
1.00
0.17
< 1.00
1.00
< 0.50
2.50
< 0.50

0.20
5.00
22.30
1.30
3.11
37.20

< 1.00
< 1.00
< 0.20
< 1.00
< 1.00

< 0.50
3.00

< 1.00
10.00
< 0.50
< 4.00
0.30

< 10.00

< 5.00
MAX
VALUE
720.00
8.00
2.00
4.00
234.00
14.62
< 0.50
2.30
4.00
105.70
< 0.30
5.00
1.18
2.40
150.00
< 0.50
2.50
0.20

1.70
63.00
22.30
1.30
63.00
37.20

290.00
4.30
0.40
15.50
185.00

1.10
3.00

< 1.00
10.00
27.00
< 4.00
17.00

720.00

720.00
MIN
DETECTS
0.20
0.50
0.60
4.00
0.30
0.72

2.30
0.02
0.60

0.50
0.02
0.52
1.00

0.14
0.10

0.20
1.50
0.50
1.10
0.60
0.20

0.20
1.10
0.40
0.60
0.20

0.30
1.00


0.50
0.50

0.30

0.02

0.02
MEDIAN
DETECTS
3.40
1.15
1.00
4.00
2.70
2.57

2.30
0.85
2.60

1.00
1.00
1.40
4.00

0.53
0.15

0.30
5.50
1.00
1.10
2.56
0.50

1.13
2.30
0.40
0.80
1.05

0.80
2.00


0.90
0.75

1.40

1.10

1.10
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.38.C  URCIS (Round 1) Data- o-Xylene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
809
351
5
2,907
1,161
47
46
333
86
2,465
1,219
1,907
940
1,860
2,312
22
6
1,581

2,644
321
38
64
644
26

3,126
1,595
148
2,082
13,202

1,220
10

10
7
3,987
362
313

47,856

44,755
TOTAL
UNIQUE
PWS
272
131
2
941
164
19
1
13
61
1,162
127
1,002
258
345
524
13
6
978

1,550
85
35
41
297
20

1,509
590
8
354
2,463

303
10

3
5
992
132
145

14,561

13,987
GWPWS
210
93
1
873
143
11
0
11
27
1,053
112
963
185
309
291
9
6
935

1,526
71
35
27
254
20

1,484
555
7
251
2,328

156
10

0
4
937
61
116

13,074

12,638
SWPWS
67
42
1
104
27
9
1
2
42
109
16
39
73
37
233
4
0
43

28
14
0
17
44
0

25
35
2
122
135

147
0

3
1
77
72
38

1,609

1,450
% PWS
>MRL
5.88%
15.27%
100.00%
0.11%
6.71%
47.37%
0.00%
7.69%
9.84%
0.52%
0.00%
2.20%
2.71%
0.87%
2.67%
0.00%
100.00%
0.20%

2.32%
5.88%
100.00%
9.76%
5.72%
100.00%

1.19%
0.17%
12.50%
2.26%
1.87%

0.99%
100.00%

0.00%
60.00%
0.91%
0.00%
2.76%

2.38%

1.76%
%GW
PWS
>MRL
6.67%
16.13%
100.00%
0.11%
4.20%
36.36%
0.00%
9.09%
18.52%
0.57%
0.00%
2.08%
3.78%
0.32%
2.75%
0.00%
100.00%
0.11%

2.23%
7.04%
100.00%
11.11%
6.30%
100.00%

1.21%
0.18%
14.29%
0.80%
1.93%

0.64%
100.00%

0.00%
75.00%
0.75%
0.00%
3.45%

2.30%

1 .69%
%SW
PWS
>MRL
5.97%
11.90%
100.00%
0.00%
18.52%
55.56%
0.00%
0.00%
2.38%
0.00%
0.00%
5.13%
0.00%
5.41%
2.58%
0.00%
0.00%
2.33%

7.14%
0.00%
0.00%
5.88%
2.27%
0.00%

0.00%
0.00%
0.00%
4.92%
0.74%

1.36%
0.00%

0.00%
0.00%
2.60%
0.00%
0.00%

2.92%

2.41%
% PWS
>1/2MCL

















%GW
PWS
> 1/2 MCL

















%SW
PWS
> 1/2 MCL

















% PWS
>MCL

















I here is no Health Keterence Level (
%GW
PWS
>MCL

















%sw
PWS
>MCL

















HKL), Maximum
Contaminant Level (MCL), or Health Advisory Level (HAL) for
o-Xvlene.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.39.a URCIS (Round 1) Data- p-Chlorotoluene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
679
131
1
938
148
9
1
13
108
1,162
19
804
258
365
524
13

983

1,553
85
1
565
297
1

1,506
590
8
352
2,655
335
303

419
3
1
992
133
145

16,100

15,612
GWPWS
548
93
1
869
135
7
0
11
30
1,053
15
765
185
327
291
9

936

1,529
71
1
523
254
1

1,481
555
7
248
2,492
306
156

399
0
1
937
62
116

14,414

14,057
SWPWS
136
42
0
105
19
3
1
2
87
109
4
39
73
39
233
4

50

28
14
0
57
44
0

25
35
2
123
167
29
147

34
3
0
77
72
38

1,841

1,689
% PWS >
MRL
0.44%
1 .53%
100.00%
0.00%
0.68%
0.00%
0.00%
0.00%
2.78%
0.00%
0.00%
0.00%
0.39%
0.00%
0.38%
0.00%

0.00%

0.00%
0.00%
100.00%
0.00%
1 .01 %
100.00%

0.20%
0.00%
0.00%
0.28%
0.11%
0.00%
0.00%

1 .43%
0.00%
100.00%
0.00%
0.00%
0.00%

0.20%

0.17%
%GW
PWS>
MRL
0.55%
1 .08%
100.00%
0.00%
0.74%
0.00%
0.00%
0.00%
6.67%
0.00%
0.00%
0.00%
0.54%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
100.00%
0.00%
0.79%
100.00%

0.20%
0.00%
0.00%
0.40%
0.12%
0.00%
0.00%

1 .25%
0.00%
100.00%
0.00%
0.00%
0.00%

0.18%

0.15%
%sw
PWS>
MRL
0.74%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1.15%
0.00%
0.00%
0.00%
0.00%
0.00%
0.86%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
2.27%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

2.94%
0.00%
0.00%
0.00%
0.00%
0.00%

0.33%

0.36%
% PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
99% VALUE
(M9/L)
< 0.00
< 0.50
1.64
< 1.00
< 0.50
< 5.00
< 0.50
< 0.50
1.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00
3.40
< 1.00
< 0.50
3.90

< 1.80
< 1.00
< 0.20
< 1.00
< 1.00
< 0.50
< 0.50

< 5.00
< 1.00
0.50
< 0.50
< 4.00
< 0.30

< 1.00

< 1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
 7o > IVIUL indicates me proportion or systems wnn any analytical results exceeding tne concentration vaiue or tne IVIUL; it does not
necessarily indicate an MCL violation.  An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for p-Chlorotoluene is 100 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.39.b URCIS (Round 1) Data- p-Chlorotoluene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
679
131
1
938
148
9
1
13
108
1,162
19
804
258
365
524
13

983

1,553
85
1
565
297
1

1,506
590
8
352
2,655
335
303

419
3
1
992
133
145

16,100

15,612
TOTAL #
SAMPLES
1,781
352
2
2,874
1,062
33
62
333
146
2,462
60
1,210
941
1,939
2,076
22

1,754

2,657
321
1
1,623
644
2

3,147
1,595
148
2,519
16,084
444
1,212

1,318
10
1
3,987
373
313

53,508

50,054
#GW
SAMPLES
1,486
244
2
2,233
1,010
30
0
189
49
1,864
33
1,034
628
1,514
1,119
18

1,380

2,589
295
1
1,376
569
2

2,781
1,475
136
1,840
15,164
363
426

1,206
0
1
3,656
149
259

45,121

42,607
#SW
SAMPLES
295
108
0
641
52
3
62
144
97
598
27
176
313
425
957
4

374

68
26
0
247
75
0

366
120
12
679
920
81
786

112
10
0
331
224
54

8,387

7,447
% TOTAL
SAMPLES
>MRL
0.17%
0.57%
100.00%
0.00%
0.09%
0.00%
0.00%
0.00%
2.05%
0.00%
0.00%
0.00%
0.32%
0.00%
0.10%
0.00%

0.00%

0.00%
0.00%
100.00%
0.00%
0.47%
100.00%

0.10%
0.00%
0.00%
0.04%
0.02%
0.00%
0.00%

0.76%
0.00%
100.00%
0.00%
0.00%
0.00%

0.07%

0.07%
%GW
SAMPLES
>MRL
0.20%
0.41%
100.00%
0.00%
0.10%
0.00%
0.00%
0.00%
4.08%
0.00%
0.00%
0.00%
0.48%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
100.00%
0.00%
0.35%
100.00%

0.11%
0.00%
0.00%
0.05%
0.02%
0.00%
0.00%

0.75%
0.00%
100.00%
0.00%
0.00%
0.00%

0.08%

0.06%
%SW
SAMPLES
>MRL
0.34%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .03%
0.00%
0.00%
0.00%
0.00%
0.00%
0.21%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
1 .33%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.89%
0.00%
0.00%
0.00%
0.00%
0.00%

0.07%

0.08%
MIN VALUE
(M9/L)
< 0.00
< 0.50
0.4
< 0.10
< 0.00
< 0.02
< 0.50
< 0.30
< 0.00
< 0.00
< 0.30
< 0.30
< 0.02
< 0.04
< 0.50
< 0.50

< 0.20

< 0.50
< 0.20
3.40
< 0.50
< 0.50
1.20

< 0.00
< 0.00
< 0.20
< 0.06
< 0.20
< 0.50
< 0.01

< 0.10
< 1.00
0.50
< 0.50
< 0.20
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
< 0.50
1.64
< 1.00
< 0.50
< 5.00
< 0.50
< 0.50
1.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00
3.40
< 1.00
< 0.50
3.90

< 1.80
< 1.00
< 0.20
< 1.00
< 1.00
< 0.50
< 0.50

< 5.00
< 1.00
0.50
< 0.50
< 4.00
< 0.30

< 1.00

< 1.00
MAX
VALUE
(M9/L)
1.60
0.80
1.64
< 10.00
0.50
< 5.00
< 0.50
< 0.50
2.00
< 0.50
< 0.30
< 1.00
0.02
< 5.00
3.60
< 0.50

< 1.00

< 5.00
< 2.00
3.40
< 1.00
6.40
3.90

3.38
< 5.00
< 0.20
2.00
1.00
< 0.50
< 0.50

1.00
< 1.00
0.50
< 0.50
< 4.00
< 1.00

6.40

6.40
MIN
DETECTS
(M9/L)
0.50
0.60
0.40

0.50



0.50



0.02

1.20






3.40

0.90
1.20

0.15


2.00
0.50



0.10

0.50




0.02

0.02
MEDIAN
DETECTS
(M9/L)
0.50
0.70
1.02

0.50



1.00



0.02

2.40






3.40

1.70
2.55

1.70


2.00
1.00



0.10

0.50




0.55

0.50
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                               Occurrence of Unregulated Contaminants in Public Water Systems
Table A.39.C URCIS (Round 1 ) Data- p-Chlorotoluene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,781
352
2
2,874
1,062
33
62
333
146
2,462
60
1,210
941
1,939
2,076
22

1,754

2,657
321
1
1,623
644
2

3,147
1,595
148
2,519
16,084
444
1,212

1,318
10
1
3,987
373
313

53,508

50,054
TOTAL
UNIQUE
PWS
679
131
1
938
148
9
1
13
108
1,162
19
804
258
365
524
13

983

1,553
85
1
565
297
1

1,506
590
8
352
2,655
335
303

419
3
1
992
133
145

16,100

15,612
#GW
PWS
548
93
1
869
135
7
0
11
30
1,053
15
765
185
327
291
9

936

1,529
71
1
523
254
1

1,481
555
7
248
2,492
306
156

399
0
1
937
62
116

14,414

14,057
#SW
PWS
136
42
0
105
19
3
1
2
87
109
4
39
73
39
233
4

50

28
14
0
57
44
0

25
35
2
123
167
29
147

34
3
0
77
72
38

1,841

1,689
% PWS
>MRL
0.44%
1.53%
100.00%
0.00%
0.68%
0.00%
0.00%
0.00%
2.78%
0.00%
0.00%
0.00%
0.39%
0.00%
0.38%
0.00%

0.00%

0.00%
0.00%
100.00%
0.00%
1.01%
100.00%

0.20%
0.00%
0.00%
0.28%
0.11%
0.00%
0.00%

1.43%
0.00%
100.00%
0.00%
0.00%
0.00%

0.20%

0.17%
%GW
PWS
>MRL
0.55%
1 .08%
100.00%
0.00%
0.74%
0.00%
0.00%
0.00%
6.67%
0.00%
0.00%
0.00%
0.54%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
100.00%
0.00%
0.79%
100.00%

0.20%
0.00%
0.00%
0.40%
0.12%
0.00%
0.00%

1 .25%
0.00%
100.00%
0.00%
0.00%
0.00%

0.18%

0.15%
%sw
PWS
>MRL
0.74%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1.15%
0.00%
0.00%
0.00%
0.00%
0.00%
0.86%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
2.27%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

2.94%
0.00%
0.00%
0.00%
0.00%
0.00%

0.33%

0.36%
% PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the
The Maximum Contaminant Level (MCL) for p-Chlorotoluene is 100 ug/L
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.40.a URCIS (Round 1) Data- p-Dichlorobenzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
706
131

967
3,528
13
1
13
116
1,163
127


390
525
13

842

1,564
85
4

297
5

1,240
590
10
357
1,687


10
417
3

992
68
144

16,008

15,494
GWPWS
573
93

892
3,498
10
0
11
10
1,054
112


345
291
9

795

1,539
71
4

254
5

1,237
555
8
253
1,557


1
395
0

937
31
116

14,656

14,284
SWPWS
139
42

118
41
4
1
2
107
109
16


46
234
4

50

29
14
0

44
0

3
35
4
123
134


9
36
3

77
37
37

1,498

1,334
% PWS >
MRL
2.55%
0.76%

0.10%
0.37%
30.77%
0.00%
0.00%
5.17%
0.00%
0.00%


0.77%
5.90%
7.69%

1.31%

3.45%
0.00%
100.00%

6.06%
100.00%

1.13%
0.00%
0.00%
0.56%
1.01%


90.00%
1 .20%
0.00%

0.20%
0.00%
0.00%

1 .37%

1 .25%
%GW
PWS>
MRL
2.44%
0.00%

0.11%
0.26%
30.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.58%
6.19%
0.00%

1.01%

3.51%
0.00%
100.00%

6.30%
100.00%

1.13%
0.00%
0.00%
0.00%
1 .09%


100.00%
1.01%
0.00%

0.11%
0.00%
0.00%

1.17%

1.11%
%sw
PWS>
MRL
2.88%
2.38%

0.00%
9.76%
25.00%
0.00%
0.00%
5.61%
0.00%
0.00%


2.17%
5.56%
25.00%

6.00%

0.00%
0.00%
0.00%

4.55%
0.00%

0.00%
0.00%
0.00%
1 .63%
0.00%


88.89%
2.78%
0.00%

1 .30%
0.00%
0.00%

3.20%

2.70%
% PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
99% VALUE
(M9/L)
< 0.00
< 0.50

< 1.00
< 5.00
14.00
< 1.00
< 0.50
5.00
< 0.50
< 0.30


< 2.00
1.00
4.38

0.30

0.60
< 5.00
0.90

2.70
3.80

0.20
< 1.00
< 0.50
< 1.00
< 2.00


7.00
< 5.00
< 0.50

< 0.50
< 4.00
< 0.50

< 4.40

< 4.40
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for p-Dichlorobenzene is 750 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.40.b  URCIS (Round 1) Data- p-Dichlorobenzene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
706
131

967
3,528
13
1
13
116
1,163
127


390
525
13

842

1,564
85
4

297
5

1,240
590
10
357
1,687


10
417
3

992
68
144

16,008

15,494
TOTAL #
SAMPLES
2,050
352

3,014
1 1 ,898
30
66
333
139
2,461
1,221


2,343
3,681
22

1,633

2,750
323
4

644
9

1,767
1,595
191
2,571
6,367


14
1,272
10

3,987
192
310

51 ,249

47,676
#GW
SAMPLES
1,737
244

2,318
1 1 ,787
26
0
189
15
1,863
1,081


1,790
1,406
18

1,247

2,671
297
4

569
9

1,758
1,475
155
1,882
5,754


2
1,159
0

3,656
86
259

43,457

40,875
#SW
SAMPLES
313
108

696
111
4
66
144
124
598
140


553
2,275
4

386

79
26
0

75
0

9
120
36
689
613


12
113
10

331
106
51

7,792

6,801
% TOTAL
SAMPLES
>MRL
0.93%
0.28%

0.07%
0.39%
23.33%
0.00%
0.00%
4.32%
0.00%
0.00%


0.26%
1.20%
4.55%

1.22%

2.22%
0.00%
100.00%

5.28%
100.00%

1.25%
0.00%
0.00%
0.12%
0.38%


92.86%
0.71%
0.00%

0.08%
0.00%
0.00%

0.65%

0.62%
%GW
SAMPLES
>MRL
0.86%
0.00%

0.09%
0.36%
23.08%
0.00%
0.00%
0.00%
0.00%
0.00%


0.22%
1.99%
0.00%

1.28%

2.28%
0.00%
100.00%

5.27%
100.00%

1.25%
0.00%
0.00%
0.00%
0.42%


100.00%
0.69%
0.00%

0.03%
0.00%
0.00%

0.63%

0.62%
%SW
SAMPLES
>MRL
1 .28%
0.93%

0.00%
3.60%
25.00%
0.00%
0.00%
4.84%
0.00%
0.00%


0.36%
0.70%
25.00%

1.04%

0.00%
0.00%
0.00%

5.33%
0.00%

0.00%
0.00%
0.00%
0.44%
0.00%


91 .67%
0.88%
0.00%

0.60%
0.00%
0.00%

0.77%

0.65%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.00
< 0.50
< 0.30
< 0.00
< 0.50
< 0.00


< 0.09
< 0.10
< 0.50

< 0.10

< 0.10
< 0.20
0.50

< 0.50
0.50

< 0.00
< 0.00
< 0.05
< 0.03
< 0.20


< 0.00
< 0.10
< 0.50

< 0.50
< 0.15
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
< 0.50

< 1.00
< 5.00
14.00
< 1.00
< 0.50
5.00
< 0.50
< 0.30


< 2.00
1.00
4.38

0.30

0.60
< 5.00
0.90

2.70
3.80

0.20
< 1.00
< 0.50
< 1.00
< 2.00


7.00
< 5.00
< 0.50

< 0.50
< 4.00
< 0.50

< 4.40

< 4.40
MAX VALUE
(M9/L)
89.00
1.32

10.00
4.20
14.00
< 1.00
< 0.70
10.00
< 0.50
< 0.30


0.60
47.00
4.38

19.00

3.30
< 5.00
0.90

6.00
3.80

11.90
< 5.00
< 0.50
6.00
3.56


7.00
1.70
< 0.50

1.30
< 4.00
< 0.50

89.00

89.00
MIN
DETECTS
(M9/L)
0.10
1.32

10.00
0.20
0.19


0.10




0.11
1.00
4.38

0.10

0.20

0.50

0.60
0.50

0.07


1.00
0.50


1.00
0.10


0.50



0.07

0.07
MEDIAN
DETECTS
(M9/L)
0.60
1.32

10.00
0.93
0.47


5.00




0.13
2.00
4.38

0.50

0.40

0.50

1.20
0.80

0.70


1.00
1.28


2.00
0.10


0.70



1.00

1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (1
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                Occurrence of Unregulated Contaminants in Public Water Systems
Table A.40.C URCIS (Round 1) Data-
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
2,050
352

3,014
11,898
30
66
333
139
2,461
1,221


2,343
3,681
22

1,633

2,750
323
4

644
9

1,767
1,595
191
2,571
6,367


14
1,272
10

3,987
192
310

51,249

47,676
TOTAL
UNIQUE
PWS
706
131

967
3,528
13
1
13
116
1,163
127


390
525
13

842

1,564
85
4

297
5

1,240
590
10
357
1,687


10
417
3

992
68
144

16,008

15,494
#GW
PWS
573
93

892
3,498
10
0
11
10
1,054
112


345
291
9

795

1,539
71
4

254
5

1,237
555
8
253
1,557


1
395
0

937
31
116

14,656

14,284
p-Dichlorobenzene Occurrence in Public Water Systems- Based on Number of Systems
# SW PWS
139
42

118
41
4
1
2
107
109
16


46
234
4

50

29
14
0

44
0

3
35
4
123
134


9
36
3

77
37
37

1,498

1,334
% PWS
>MRL
2.55%
0.76%

0.10%
0.37%
30.77%
0.00%
0.00%
5.17%
0.00%
0.00%


0.77%
5.90%
7.69%

1.31%

3.45%
0.00%
100.00%

6.06%
100.00%

1.13%
0.00%
0.00%
0.56%
1.01%


90.00%
1 .20%
0.00%

0.20%
0.00%
0.00%

1 .37%

1 .25%
%GW
PWS
>MRL
2.44%
0.00%

0.11%
0.26%
30.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.58%
6.19%
0.00%

1.01%

3.51%
0.00%
100.00%

6.30%
100.00%

1.13%
0.00%
0.00%
0.00%
1 .09%


100.00%
1.01%
0.00%

0.11%
0.00%
0.00%

1.17%

1.11%
%sw
PWS
>MRL
2.88%
2.38%

0.00%
9.76%
25.00%
0.00%
0.00%
5.61%
0.00%
0.00%


2.17%
5.56%
25.00%

6.00%

0.00%
0.00%
0.00%

4.55%
0.00%

0.00%
0.00%
0.00%
1 .63%
0.00%


88.89%
2.78%
0.00%

1 .30%
0.00%
0.00%

3.20%

2.70%
% PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy
The Maximum Contaminant Level (MCL) for p-Dichlorobenzene is 750 pg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                          Occurrence of Unregulated Contaminants in Public Water Systems
Table A.41.a URCIS (Round 1) Data- p-lsopropyltoluene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
669



143
6
1
10

1,162


213
355
524
13
1
983

1,553
85


297
1
1
783
590
8
356
2,653
335
303

410
3

992
57
145

12,652

12,167
# GW PWS
543



131
4
0
8

1,053


149
319
291
9
0
936

1,529
71


254
1
1
772
555
7
252
2,490
306
156

390
0

937
26
116

11,306

10,953
#SWPWS
131



18
3
1
2

109


64
37
233
4
1
50

28
14


44
0
0
11
35
2
123
166
29
147

34
3

77
31
38

1,435

1,282
% PWS
>MRL
0.90%



0.70%
16.67%
0.00%
0.00%

0.09%


0.47%
0.00%
0.19%
0.00%
100.00%
0.10%

0.00%
0.00%


0.00%
100.00%
100.00%
0.38%
0.00%
0.00%
0.28%
0.26%
0.30%
0.33%

1.46%
0.00%

0.10%
0.00%
0.00%

0.28%

0.25%
% GW PWS
>MRL
1.10%



0.76%
25.00%
0.00%
0.00%

0.09%


0.67%
0.00%
0.34%
0.00%
0.00%
0.11%

0.00%
0.00%


0.00%
100.00%
100.00%
0.39%
0.00%
0.00%
0.00%
0.28%
0.33%
0.64%

1.28%
0.00%

0.11%
0.00%
0.00%

0.28%

0.26%
% SW PWS
>MRL
0.00%



0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
100.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.81%
0.00%
0.00%
0.00%

2.94%
0.00%

0.00%
0.00%
0.00%

0.21%

0.08%
% PWS
>HRL

















% GW PWS
>HRL

















% SW PWS
>HRL

















There is no Health Reference Level
(HRL), Maximum Contaminant Level
(MCL), or Health Advisory Level (HAL) for
p-lsoproyltoluene.


































































99% VALUE
(M9/L)
< 0.00



< 0.50
0.50
< 0.50
< 0.30

< 0.50


< 2.00
< 2.00
< 1.00
< 0.50
0.80
< 0.50

< 0.50
< 2.00


< 0.50
0.80
1.70
< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50

< 10.00
< 1.00

< 0.50
< 4.00
< 0.50

< 2.00

< 2.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting
Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                            Occurrence of Unregulated Contaminants in Public Water Systems
Table A.41 .b URCIS (Round 1) Data- p-lsopropyltoluene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE PWS
669



143
6
1
10

1,162


213
355
524
13
1
983

1,553
85


297
1
1
783
590
8
356
2,653
335
303

410
3

992
57
145

12,652

12,167
TOTAL #
SAMPLES
1,760



1,108
9
48
53

2,459


728
1,875
2,075
22
1
1,749

2,657
323


644
2
2
1,604
1,595
148
2,090
15,953
444
1,216

1,230
10

3,987
169
313

44,274

41,566
#GW
SAMPLES
1,489



1,057
6
0
44

1,862


485
1,474
1,119
18
0
1,375

2,589
297


569
2
2
1,417
1,475
136
1,560
15,035
363
431

1,125
0

3,656
64
259

37,909

35,844
#SW
SAMPLES
271



51
3
48
9

597


243
401
956
4
1
374

68
26


75
0
0
187
120
12
530
918
81
785

105
10

331
105
54

6,365

5,722
% TOTAL
SAMPLES
>MRL
0.45%



0.09%
11.11%
0.00%
0.00%

0.04%


0.55%
0.00%
0.05%
0.00%
100.00%
0.06%

0.00%
0.00%


0.00%
100.00%
100.00%
0.19%
0.00%
0.00%
0.05%
0.05%
0.23%
0.08%

0.81%
0.00%

0.03%
0.00%
0.00%

0.11%

0.10%
%GW
SAMPLES
>MRL
0.54%



0.09%
16.67%
0.00%
0.00%

0.05%


0.82%
0.00%
0.09%
0.00%
0.00%
0.07%

0.00%
0.00%


0.00%
100.00%
100.00%
0.21%
0.00%
0.00%
0.00%
0.05%
0.28%
0.23%

0.80%
0.00%

0.03%
0.00%
0.00%

0.12%

0.11%
%sw
SAMPLES
>MRL
0.00%



0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
100.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.19%
0.00%
0.00%
0.00%

0.95%
0.00%

0.00%
0.00%
0.00%

0.05%

0.02%
MIN VALUE
(M9/L)
< 0.00



< 0.00
< 0.12
< 0.50
< 0.30

< 0.50 <


< 0.01
< 0.10
< 0.50
< 0.50
0.08
< 0.10

< 0.20
< 0.20


< 0.50
0.20
1.20
< 0.00
< 0.00
< 0.20
< 0.10
< 0.20
< 0.26
< 0.01

< 0.10
< 1.00

< 0.50
< 0.50
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00



< 0.50
0.50
< 0.50
< 0.30

< 0.50


< 2.00
< 2.00
< 1.00
< 0.50
0.80
< 0.50

< 0.50
< 2.00


< 0.50
0.80
1.70
< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50

< 10.00
< 1.00

< 0.50
< 4.00
< 0.50

< 2.00

< 2.00
MAX VALUE
(M9/L)
11.80



2.30
0.50
< 0.50
< 0.30

0.70


2.00
< 5.00
1.00
< 0.50
0.08
1.00

< 5.00
< 2.00


< 0.50
0.80
1.70
1.00
< 5.00
< 0.20
10.00
5.00
0.50
1.00

10.00
< 1.00

0.60
< 4.00
< 1.00

11.80

11.80
MIN DETECTS
(M9/L)
0.10



2.30
0.50



0.70


0.01

1.00

0.08
0.10






0.20
1.20
0.03


2.00
0.20
0.26
1.00

0.10


0.60



0.01

0.01
MEDIAN
DETECTS
(M9/L)
0.35



2.30
0.50



0.70


0.03

1.00

0.08
0.10






0.50
1.45
0.03


2.00
0.95
0.26
1.00

0.50


0.60



0.50

0.50
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.41 .c  URCIS (Round 1) Data- p-lsopropyltoluene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL #
SAMPLES
1,760



1,108
9
48
53

2,459


728
1,875
2,075
22
1
1,749

2,657
323


644
2
2
1,604
1,595
148
2,090
15,953
444
1,216

1,230
10

3,987
169
313

44,274

41,566
TOTAL
UNIQUE PWS
669



143
6
1
10

1,162


213
355
524
13
1
983

1,553
85


297
1
1
783
590
8
356
2,653
335
303

410
3

992
57
145

12,652

12,167
# GW PWS
543



131
4
0
8

1,053


149
319
291
9
0
936

1,529
71


254
1
1
772
555
7
252
2,490
306
156

390
0

937
26
116

11,306

10,953
# SW PWS
131



18
3
1
2

109


64
37
233
4
1
50

28
14


44
0
0
11
35
2
123
166
29
147

34
3

77
31
38

1,435

1,282
% PWS
>MRL
0.90%



0.70%
16.67%
0.00%
0.00%

0.09%


0.47%
0.00%
0.19%
0.00%
100.00%
0.10%

0.00%
0.00%


0.00%
100.00%
100.00%
0.38%
0.00%
0.00%
0.28%
0.26%
0.30%
0.33%

1.46%
0.00%

0.10%
0.00%
0.00%

0.28%

0.25%
% GW PWS
>MRL
1.10%



0.76%
25.00%
0.00%
0.00%

0.09%


0.67%
0.00%
0.34%
0.00%
0.00%
0.11%

0.00%
0.00%


0.00%
100.00%
100.00%
0.39%
0.00%
0.00%
0.00%
0.28%
0.33%
0.64%

1.28%
0.00%

0.11%
0.00%
0.00%

0.28%

0.26%
% SW PWS
>MRL
0.00%



0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
100.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.81%
0.00%
0.00%
0.00%

2.94%
0.00%

0.00%
0.00%
0.00%

0.21%

0.08%
% PWS
> 1/2 HRL

















% GW PWS
> 1/2 HRL

















% SW PWS
> 1/2 HRL

















% PWS
>HRL

















% GW PWS
>HRL

















% SW PWS
>HRL

















There is no Health Reference Level (HRL), Maximum Contaminant Level (MCL), or Health
Advisory Level (HAL) for p-lsoproyltoluene.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                 Occurrence of Unregulated Contaminants in Public Water Systems
Table A.42.a URCIS (Round 1) Data- p-Xylene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
273
131

942
1
13
1
13
58
1,162
37
265
258
180
524

8
978


71

41
297
7

1,508
590

257
2,450

302
2




129
1

10,499

10,127
GWPWS
211
93

874
1
10
0
11
26
1,053
33
246
185
151
291

8
935


57

27
254
7

1,483
555

168
2,323

155
2




60
0

9,219

8,956
SWPWS
67
42

104
0
4
1
2
39
109
5
19
73
30
233

0
43


14

17
44
0

25
35

106
127

147
0




70
1

1,357

1,230
% PWS >
MRL
2.56%
5.34%

0.11%
0.00%
23.08%
0.00%
0.00%
5.17%
0.52%
0.00%
0.75%
3.10%
0.00%
4.77%

87.50%
0.41%


2.82%

2.44%
8.75%
100.00%

1.13%
0.34%

1 .95%
1 .96%

0.99%
1




0.00%
0.00%

1 .77%

1 .58%
%GW
PWS>
MRL
2.84%
6.45%

0.11%
0.00%
20.00%
0.00%
0.00%
1 1 .54%
0.57%
0.00%
0.81%
3.78%
0.00%
3.78%

87.50%
0.21%


3.51%

0.00%
10.24%
100.00%

1.15%
0.36%

1.19%
1 .89%

0.00%
1




0.00%
0.00%

1 .68%

1 .49%
%sw
PWS>
MRL
2.99%
4.76%

0.00%
0.00%
25.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .37%
0.00%
6.01%

0.00%
4.65%


0.00%

5.88%
0.00%
0.00%

0.00%
0.00%

2.83%
3.15%

2.04%
0




0.00%
0.00%

2.43%

2.36%
% PWS >
MCL

















%GW
PWS>
MCL

















%SW
PWS>
MCL

















There is no Health Reference Level
(HRL), Maximum Contaminant
Level (MCL), or Health Advisory
Level (HAL) for p-Xylene.




























































99%
VALUE
(M9/L)
3.50
2.50

< 5.00
< 0.00
4.00
< 0.50
< 0.50
9.30
< 0.50
< 0.30
< 1.00
0.12
< 1.00
2.00

21.00
< 0.50


5.00

2.80
4.30
64.10

< 1.00
< 1.00

< 1.00
< 0.50

< 0.50
69.00




< 4.00
< 1.00

< 5.00

< 5.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.42.b URCIS (Round 1) Data- p-Xylene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
273
131

942
1
13
1
13
58
1,162
37
265
258
180
524

8
978


71

41
297
7

1,508
590

257
2,450

302
2




129
1

10,499

10,127
TOTAL #
SAMPLES
793
351

2,906
31
38
46
333
81
2,464
84
378
936
1,069
2,305

9
1,581


228

67
644
7

3,130
1,595

1,448
12,852

1,218
2




351
3

34,950

32,839
#GW
SAMPLES
662
244

2,262
31
34
0
189
38
1,865
55
333
627
805
1,172

9
1,274


202

40
569
7

2,776
1,475

995
12,446

432
2




134
0

28,678

27,240
#SW
SAMPLES
131
107

644
0
4
46
144
43
599
29
45
309
264
1,133

0
307


26

27
75
0

354
120

453
406

786
0




217
3

6,272

5,599
% TOTAL
SAMPLES
>MRL
1 .39%
2.56%

0.03%
0.00%
7.89%
0.00%
0.00%
3.70%
0.37%
0.00%
0.53%
1 .39%
0.00%
1 .87%

88.89%
0.44%


4.39%

1 .49%
4.04%
100.00%

0.61%
0.63%

0.41%
0.50%

0.25%
100.00%




0.00%
0.00%

0.74%

0.67%
%GW
SAMPLES
>MRL
1 .36%
2.87%

0.04%
0.00%
5.88%
0.00%
0.00%
7.89%
0.48%
0.00%
0.60%
1 .91 %
0.00%
1 .02%

88.89%
0.16%


4.95%

0.00%
4.57%
100.00%

0.68%
0.68%

0.20%
0.48%

0.00%
100.00%




0.00%
0.00%

0.71 %

0.63%
%SW
SAMPLES
>MRL
1 .53%
1 .87%

0.00%
0.00%
25.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.32%
0.00%
2.74%

0.00%
1 .63%


0.00%

3.70%
0.00%
0.00%

0.00%
0.00%

0.88%
0.99%

0.38%
0.00%




0.00%
0.00%

0.86%

0.88%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.00
< 0.50
< 0.20
< 0.00
< 0.50
< 0.30
< 0.20
< 0.02
< 0.10
< 0.50

< 0.50
< 0.10


< 0.20

< 0.50
< 0.30
0.20

< 0.00
< 0.00

< 0.10
< 0.20

< 0.01
9.00




< 0.50
< 1.00

< 0.00

< 0.00
99% VALUE
(M9/L)
3.50
2.50

< 5.00
< 0.00
4.00
< 0.50
< 0.50
9.30
< 0.50
< 0.30
< 1.00
0.12
< 1.00
2.00

21.00
< 0.50


5.00

2.80
4.30
64.10

< 1.00
< 1.00

< 1.00
< 0.50

< 0.50
69.00




< 4.00
< 1.00

< 5.00

< 5.00
MAX
VALUE
(M9/L)
890.00
105.60

3.00
< 0.00
4.00
< 0.50
< 0.60
9.30
253.40
< 0.30
0.70
2.00
< 4.00
414.00

21.00
0.40


5.00

2.80
22.00
64.10

62.20
9.60

4.10
105.00

3.10
69.00




< 4.00
< 1.00

890.00

890.00
MIN
DETECTS
(M9/L)
0.40
0.50

3.00

0.10


1.50
0.80

0.70
0.02

1.00

0.50
0.10


3.00

2.80
0.30
0.20

0.08
0.20

0.50
0.30

0.80
9.00







0.02

0.02
MEDIAN
DETECTS
(M9/L)
62.00
1.10

3.00

2.68


2.00
1.80

0.70
0.60

2.00

0.86
0.20


4.00

2.80
2.70
0.50

0.73
1.40

0.90
1.06

2.20
39.00







1.30

1.20
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.42.C URCIS (Round 1) Data- p-Xylene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
793
351

2,906
31
38
46
333
81
2,464
84
378
936
1,069
2,305

9
1,581


228

67
644
7

3,130
1,595

1,448
12,852

1,218
2




351
3

34,950

32,839
TOTAL
UNIQUE
PWS
273
131

942
1
13
1
13
58
1,162
37
265
258
180
524

8
978


71

41
297
7

1,508
590

257
2,450

302
2




129
1

10,499

10,127
# GW PWS
211
93

874
1
10
0
11
26
1,053
33
246
185
151
291

8
935


57

27
254
7

1,483
555

168
2,323

155
2




60
0

9,219

8,956
# SW PWS
67
42

104
0
4
1
2
39
109
5
19
73
30
233

0
43


14

17
44
0

25
35

106
127

147
0




70
1

1,357

1,230
% PWS
>MRL
2.56%
5.34%

0.11%
0.00%
23.08%
0.00%
0.00%
5.17%
0.52%
0.00%
0.75%
3.10%
0.00%
4.77%

87.50%
0.41%


2.82%

2.44%
8.75%
100.00%

1.13%
0.34%

1.95%
1.96%

0.99%
100.00%




0.00%
0.00%

1.77%

1.58%
%GW
PWS
>MRL
2.84%
6.45%

0.11%
0.00%
20.00%
0.00%
0.00%
1 1 .54%
0.57%
0.00%
0.81%
3.78%
0.00%
3.78%

87.50%
0.21%


3.51%

0.00%
10.24%
100.00%

1.15%
0.36%

1.19%
1 .89%

0.00%
100.00%




0.00%
0.00%

1 .68%

1 .49%
%sw
PWS
>MRL
2.99%
4.76%

0.00%
0.00%
25.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1.37%
0.00%
6.01%

0.00%
4.65%


0.00%

5.88%
0.00%
0.00%

0.00%
0.00%

2.83%
3.15%

2.04%
0.00%




0.00%
0.00%

2.43%

2.36%
% PWS
> 1/2 MCL

















%GW
PWS
> 1/2 MCL

















%sw
PWS
> 1/2 MCL

















% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level (HRL), Maximum
Contaminant Level (MCL), or Health Advisory Level (HAL) for p-
Xylene.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for labors
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                 Occurrence of Unregulated Contaminants in Public Water Systems
Table A.43.a URCIS (Round 1) Data- sec-Butylbenzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
671
131

449
145
5
1
10

1,162


213
357
524
13
2
983

1,553
85


297
1
1
783
590
8
357
2,653
335
303


3

992
57
145

12,829

12,343
GWPWS
545
93

408
133
3
0
8

1,053


149
321
291
9
2
936

1,529
71


254
1
1
772
555
7
253
2,491
306
156


0

937
26
116

1 1 ,426

1 1 ,071
SWPWS
131
42

47
18
3
1
2

109


64
37
233
4
0
50

28
14


44
0
0
11
35
2
123
166
29
147


3

77
31
38

1,489

1,337
% PWS >
MRL
0.75%
0.00%

0.89%
0.69%
0.00%
0.00%
0.00%

0.00%


0.47%
0.00%
0.00%
0.00%
50.00%
0.10%

0.00%
0.00%


0.00%
100.00%
100.00%
0.38%
0.00%
0.00%
0.28%
0.26%
0.00%
0.99%


0.00%

0.30%
0.00%
0.00%

0.25%

0.23%
%GW
PWS>
MRL
0.92%
0.00%

0.74%
0.75%
0.00%
0.00%
0.00%

0.00%


0.67%
0.00%
0.00%
0.00%
50.00%
0.11%

0.00%
0.00%


0.00%
100.00%
100.00%
0.39%
0.00%
0.00%
0.40%
0.28%
0.00%
0.64%


0.00%

0.32%
0.00%
0.00%

0.25%

0.23%
%sw
PWS>
MRL
0.76%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .36%


0.00%

0.00%
0.00%
0.00%

0.20%

0.22%
% PWS >
MCL

















%GW
PWS>
MCL

















%SW
PWS>
MCL

















There is no Health Reference Level
(HRL), Maximum Contaminant
Level (MCL), or Health Advisory
Level (HAL) for
sec-Butylbenzene.




























































99%
VALUE
(M9/L)
< 0.00
< 0.50

< 3.00
< 0.50
< 0.50
< 0.50
< 0.70

< 0.50


< 2.00
< 2.00
< 1.00
< 0.50
0.08
< 0.50

< 0.50
< 2.00


< 0.50
0.20
1.00
< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50


< 1.00

< 0.50
< 4.00
< 0.40

< 2.00

< 2.00
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.43.b URCIS (Round 1) Data- sec-Butylbenzene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
671
131

449
145
5
1
10

1,162


213
357
524
13
2
983

1,553
85


297
1
1
783
590
8
357
2,653
335
303


3

992
57
145

12,829

12,343
TOTAL #
SAMPLES
1,768
351

1,099
1,111
8
48
53

2,462


728
1,889
2,076
22
2
1,749

2,657
323


644
1
2
1,604
1,595
148
2,096
15,951
444
1,220


10

3,987
170
313

44,531

41,818
#GW
SAMPLES
1,497
244

935
1,060
5
0
44

1,863


485
1,486
1,119
18
2
1,375

2,589
297


569
1
2
1,417
1,475
136
1,562
15,037
363
433


0

3,656
64
259

37,993

35,926
#SW
SAMPLES
271
107

164
51
3
48
9

599


243
403
957
4
0
374

68
26


75
0
0
187
120
12
534
914
81
787


10

331
106
54

6,538

5,892
% TOTAL
SAMPLES
>MRL
0.28%
0.00%

0.64%
0.09%
0.00%
0.00%
0.00%

0.00%


0.55%
0.00%
0.00%
0.00%
50.00%
0.06%

0.00%
0.00%


0.00%
100.00%
100.00%
0.19%
0.00%
0.00%
0.10%
0.04%
0.00%
0.25%


0.00%

0.08%
0.00%
0.00%

0.09%

0.08%
%GW
SAMPLES
>MRL
0.33%
0.00%

0.32%
0.09%
0.00%
0.00%
0.00%

0.00%


0.82%
0.00%
0.00%
0.00%
50.00%
0.07%

0.00%
0.00%


0.00%
100.00%
100.00%
0.21%
0.00%
0.00%
0.13%
0.05%
0.00%
0.23%


0.00%

0.08%
0.00%
0.00%

0.09%

0.08%
%SW
SAMPLES
>MRL
1 .48%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.25%


0.00%

0.00%
0.00%
0.00%

0.09%

0.10%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.13
< 0.50
< 0.30

< 0.50


< 0.03
< 0.10
< 0.50
< 0.50
< 0.08
< 0.20

< 0.50
< 0.20


< 0.50
0.20
0.81
< 0.00
< 0.00
< 0.20
< 0.10
< 0.00
< 0.50
< 0.02


< 1.00

< 0.50
< 0.50
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
< 0.50

< 3.00
< 0.50
< 0.50
< 0.50
< 0.70

< 0.50


< 2.00
< 2.00
< 1.00
< 0.50
0.08
< 0.50

< 0.50
< 2.00


< 0.50
0.20
1.00
< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50


< 1.00

< 0.50
< 4.00
< 0.40

< 2.00

< 2.00
MAX
VALUE
(M9/L)
1.70
< 0.50

10.00
0.60
< 0.50
< 0.50
< 0.70

< 0.50


0.17
< 5.00
< 1.00
< 0.50
0.08
0.20

< 5.00
< 2.00


< 0.50
0.20
1.00
1.00
< 5.00
< 0.20
2.10
2.00
< 0.50
19.80


< 1.00

0.90
< 4.00
< 1.00

19.80

19.80
MIN
DETECTS
(M9/L)
0.30


0.05
0.60







0.06



0.08
0.20






0.20
0.81
0.03


1.10
0.30

1.50




0.50



0.03

0.03
MEDIAN
DETECTS
(M9/L)
0.50


10.00
0.60







0.17



0.08
0.20






0.20
0.91
0.03


1.60
2.00

10.10




0.70



0.70

0.70
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.43.C URCIS (Round 1) Data- sec-Butylbenzene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,768
351

1,099
1,111
8
48
53

2,462


728
1,889
2,076
22
2
1,749

2,657
323


644
1
2
1,604
1,595
148
2,096
15,951
444
1,220


10

3,987
170
313

44,531

41,818
TOTAL
UNIQUE
PWS
671
131

449
145
5
1
10

1,162


213
357
524
13
2
983

1,553
85


297
1
1
783
590
8
357
2,653
335
303


3

992
57
145

12,829

12,343
# GW PWS
545
93

408
133
3
0
8

1,053


149
321
291
9
2
936

1,529
71


254
1
1
772
555
7
253
2,491
306
156


0

937
26
116

1 1 ,426

11,071
# SW PWS
131
42

47
18
3
1
2

109


64
37
233
4
0
50

28
14


44
0
0
11
35
2
123
166
29
147


3

77
31
38

1,489

1,337
% PWS
>MRL
0.75%
0.00%

0.89%
0.69%
0.00%
0.00%
0.00%

0.00%


0.47%
0.00%
0.00%
0.00%
50.00%
0.10%

0.00%
0.00%


0.00%
100.00%
100.00%
0.38%
0.00%
0.00%
0.28%
0.26%
0.00%
0.99%


0.00%

0.30%
0.00%
0.00%

0.25%

0.23%
%GW
PWS
>MRL
0.92%
0.00%

0.74%
0.75%
0.00%
0.00%
0.00%

0.00%


0.67%
0.00%
0.00%
0.00%
50.00%
0.11%

0.00%
0.00%


0.00%
100.00%
100.00%
0.39%
0.00%
0.00%
0.40%
0.28%
0.00%
0.64%


0.00%

0.32%
0.00%
0.00%

0.25%

0.23%
%SW
PWS
>MRL
0.76%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1.36%


0.00%

0.00%
0.00%
0.00%

0.20%

0.22%
% PWS
> 1/2 MCL

















%GW
PWS
> 1/2 MCL

















%sw
PWS
> 1/2 MCL

















% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level (HRL), Maximum
Contaminant Level (MCL), or Health Advisory Level (HAL) for
sec-Butylbenzene.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for labors
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.44.a URCIS (Round 1) Data- Styrene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
683
131

941
184
10
1
13
216
1,161
127
1,002
1,299
366
524
13

842

1,552
85
4
565
297
22

1,496
590
8
357
2,655

303
1
415
3
1
992
137
145

17,141

16,623
GWPWS
551
93

872
166
8
0
11
40
1,052
112
963
1,185
328
291
9

795

1,528
71
4
523
254
22

1,471
555
7
253
2,492

156
1
395
0
1
937
63
116

15,325

14,938
SWPWS
137
42

105
24
3
1
2
197
109
16
39
114
39
233
4

50

28
14
0
57
44
0

25
35
2
123
167

147
0
34
3
0
77
75
38

1,984

1,832
% PWS >
MRL
1 .02%
0.76%

0.11%
0.00%
10.00%
0.00%
0.00%
6.02%
0.00%
0.00%
0.00%
1 .00%
0.27%
0.00%
0.00%

0.12%

0.52%
1.18%
100.00%
0.00%
0.34%
100.00%

0.40%
0.00%
0.00%
0.00%
0.75%

2.31%
100.00%
1 .69%
0.00%
100.00%
0.20%
0.73%
4.14%

0.73%

0.57%
%GW
PWS>
MRL
1 .27%
0.00%

0.00%
0.00%
12.50%
0.00%
0.00%
2.50%
0.00%
0.00%
0.00%
0.93%
0.30%
0.00%
0.00%

0.00%

0.52%
1.41%
100.00%
0.00%
0.39%
100.00%

0.34%
0.00%
0.00%
0.00%
0.80%

0.00%
100.00%
1 .52%
0.00%
100.00%
0.21%
1 .59%
3.45%

0.63%

0.45%
%sw
PWS>
MRL
0.00%
2.38%

0.95%
0.00%
0.00%
0.00%
0.00%
6.09%
0.00%
0.00%
0.00%
1 .75%
0.00%
0.00%
0.00%

2.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

4.00%
0.00%
0.00%
0.00%
0.00%

4.76%
0.00%
2.94%
0.00%
0.00%
0.00%
0.00%
5.26%

1.41%

1 .53%
% PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
99% VALUE
(M9/L)
< 0.00
< 0.50

< 5.00
< 0.50
7.00
< 0.50
< 0.50
2.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
8.00
0.70
< 1.00
< 0.50
6.20

< 2.00
< 1.00
< 0.20
< 1.00
< 1.00

< 0.50
2.80
< 10.00
< 1.00
0.50
< 0.50
< 4.00
0.50

< 2.00

< 2.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Styrene is 100 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.44.b URCIS (Round 1) Data- Styrene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
683
131

941
184
10
1
13
216
1,161
127
1,002
1,299
366
524
13

842

1,552
85
4
565
297
22

1,496
590
8
357
2,655

303
1
415
3
1
992
137
145

17,141

16,623
TOTAL #
SAMPLES
1,836
351

2,879
1,167
34
62
333
305
2,462
1,221
1,908
5,266
1,930
2,312
22

1,633

2,652
323
5
1,623
644
26

3,110
1,595
148
2,099
16,087

1,220
1
1,281
10
1
3,987
389
313

59,235

56,171
#GW
SAMPLES
1,540
244

2,239
1,104
31
0
189
62
1,863
1,081
1,697
4,263
1,509
1,172
18

1,247

2,584
297
5
1,376
569
26

2,755
1,475
136
1,565
15,167

433
1
1,170
0
1
3,656
164
259

49,898

47,629
#SW
SAMPLES
296
107

640
63
3
62
144
243
599
140
211
1,003
421
1,140
4

386

68
26
0
247
75
0

355
120
12
534
920

787
0
111
10
0
331
225
54

9,337

8,542
% TOTAL
SAMPLES
>MRL
0.38%
0.28%

0.03%
0.00%
2.94%
0.00%
0.00%
4.59%
0.00%
0.00%
0.00%
0.30%
0.05%
0.00%
0.00%

0.06%

0.34%
2.48%
100.00%
0.00%
0.16%
100.00%

0.23%
0.00%
0.00%
0.00%
0.12%

0.57%
100.00%
0.86%
0.00%
100.00%
0.10%
0.26%
2.24%

0.25%

0.19%
%GW
SAMPLES
>MRL
0.45%
0.00%

0.00%
0.00%
3.23%
0.00%
0.00%
3.23%
0.00%
0.00%
0.00%
0.33%
0.07%
0.00%
0.00%

0.00%

0.35%
2.69%
100.00%
0.00%
0.18%
100.00%

0.22%
0.00%
0.00%
0.00%
0.13%

0.00%
100.00%
0.85%
0.00%
100.00%
0.11%
0.61%
1 .93%

0.24%

0.17%
%SW
SAMPLES
>MRL
0.00%
0.93%

0.16%
0.00%
0.00%
0.00%
0.00%
4.94%
0.00%
0.00%
0.00%
0.20%
0.00%
0.00%
0.00%

0.26%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.28%
0.00%
0.00%
0.00%
0.00%

0.89%
0.00%
0.90%
0.00%
0.00%
0.00%
0.00%
3.70%

0.30%

0.33%
MIN VALUE
< 0.00
< 0.50

< 0.01
< 0.00
< 0.04
< 0.50
< 0.30
< 0.00
< 0.50
< 0.00
< 0.50
< 0.03
< 0.05
< 0.50
< 0.50

< 0.20

< 0.20
< 0.20
0.50
< 0.50
< 0.50
0.20

< 0.00
< 0.00
< 0.20
< 0.04
< 0.05

< 0.01
2.80
< 0.00
< 1.00
0.50
< 0.50
< 0.30
< 0.00

< 0.00

< 0.00
99% VALUE
< 0.00
< 0.50

< 5.00
< 0.50
7.00
< 0.50
< 0.50
2.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
8.00
0.70
< 1.00
< 0.50
6.20

< 2.00
< 1.00
< 0.20
< 1.00
< 1.00

< 0.50
2.80
< 10.00
< 1.00
0.50
< 0.50
< 4.00
0.50

< 2.00

< 2.00
MAX
VALUE
1.80
0.70

5.00
< 5.00
7.00
< 0.50
< 0.50
13.00
< 0.50
< 0.30
< 1.00
2.20
0.26
< 1.00
< 0.50

19.50

2.20
10.00
0.70
< 1.00
0.60
6.20

7.40
< 5.00
< 0.20
< 10.00
69.00

5.60
2.80
2.70
< 1.00
0.50
1.10
7.00
2.20

69.00

69.00
MIN
DETECTS
0.20
0.70

5.00

7.00


0.01



0.03
0.26



19.50

0.30
4.00
0.50

0.60
0.20

0.15



0.50

0.50
2.80
0.50

0.50
0.60
7.00
0.20

0.01

0.01
MEDIAN
DETECTS
0.50
0.70

5.00

7.00


1.00



1.40
0.26



19.50

0.50
7.50
0.50

0.60
0.30

0.58



2.00

0.80
2.80
0.50

0.50
0.60
7.00
0.50

0.60

0.80
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.44.C URCIS (Round 1) Data- Styrene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,836
351

2,879
1,167
34
62
333
305
2,462
1,221
1,908
5,266
1,930
2,312
22

1,633

2,652
323
5
1,623
644
26

3,110
1,595
148
2,099
16,087

1,220
1
1,281
10
1
3,987
389
313

59,235

56,171
TOTAL
UNIQUE
PWS
683
131

941
184
10
1
13
216
1,161
127
1,002
1,299
366
524
13

842

1,552
85
4
565
297
22

1,496
590
8
357
2,655

303
1
415
3
1
992
137
145

17,141

16,623
GWPWS
551
93

872
166
8
0
11
40
1,052
112
963
1,185
328
291
9

795

1,528
71
4
523
254
22

1,471
555
7
253
2,492

156
1
395
0
1
937
63
116

15,325

14,938
SWPWS
137
42

105
24
3
1
2
197
109
16
39
114
39
233
4

50

28
14
0
57
44
0

25
35
2
123
167

147
0
34
3
0
77
75
38

1,984

1,832
% PWS
>MRL
1.02%
0.76%

0.11%
0.00%
10.00%
0.00%
0.00%
6.02%
0.00%
0.00%
0.00%
1.00%
0.27%
0.00%
0.00%

0.12%

0.52%
1.18%
100.00%
0.00%
0.34%
100.00%

0.40%
0.00%
0.00%
0.00%
0.75%

2.31%
100.00%
1.69%
0.00%
100.00%
0.20%
0.73%
4.14%

0.73%

0.57%
%GW
PWS
>MRL
1 .27%
0.00%

0.00%
0.00%
12.50%
0.00%
0.00%
2.50%
0.00%
0.00%
0.00%
0.93%
0.30%
0.00%
0.00%

0.00%

0.52%
1 .41 %
100.00%
0.00%
0.39%
100.00%

0.34%
0.00%
0.00%
0.00%
0.80%

0.00%
100.00%
1 .52%
0.00%
100.00%
0.21 %
1 .59%
3.45%

0.63%

0.45%
%sw
PWS
>MRL
0.00%
2.38%

0.95%
0.00%
0.00%
0.00%
0.00%
6.09%
0.00%
0.00%
0.00%
1.75%
0.00%
0.00%
0.00%

2.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

4.00%
0.00%
0.00%
0.00%
0.00%

4.76%
0.00%
2.94%
0.00%
0.00%
0.00%
0.00%
5.26%

1.41%

1.53%
% PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the
The Maximum Contaminant Level (MCL) for Styrene is 100 ug/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                 Occurrence of Unregulated Contaminants in Public Water Systems
Table A.45.a URCIS (Round 1) Data- tert-Butylbenzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
671
131

448
144
5
1
10

1,163


213
357
524
13

983

1,553
85
2

297


793
590
8
356
2,654
335
303


3

992
57
145

12,836

12,353
GWPWS
545
93

407
132
3
0
8

1,054


149
321
291
9

936

1,529
71
2

254


782
555
7
252
2,492
306
156


0

937
26
116

1 1 ,433

1 1 ,081
SWPWS
131
42

47
18
3
1
2

109


64
37
233
4

50

28
14
0

44


11
35
2
123
166
29
147


3

77
31
38

1,489

1,337
% PWS >
MRL
0.45%
3.82%

0.89%
0.00%
0.00%
0.00%
0.00%

0.09%


0.47%
0.00%
0.00%
0.00%

0.10%

0.06%
0.00%
100.00%

0.00%


0.50%
0.00%
0.00%
0.28%
0.08%
0.00%
0.33%


0.00%

0.10%
0.00%
0.00%

0.21%

0.19%
%GW
PWS>
MRL
0.55%
4.30%

0.74%
0.00%
0.00%
0.00%
0.00%

0.09%


0.67%
0.00%
0.00%
0.00%

0.11%

0.07%
0.00%
100.00%

0.00%


0.51%
0.00%
0.00%
0.40%
0.08%
0.00%
0.00%


0.00%

0.11%
0.00%
0.00%

0.21%

0.19%
%sw
PWS>
MRL
0.00%
2.38%

2.13%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.68%


0.00%

0.00%
0.00%
0.00%

0.20%

0.22%
% PWS >
MCL

















%GW
PWS>
MCL

















%SW
PWS>
MCL

















There is no Health Reference Level
(HRL), Maximum Contaminant
Level (MCL), or Health Advisory
Level (HAL) for
tert-Butylbenzene.




























































99%
VALUE
(M9/L)
< 0.00
1.00

< 3.00
< 0.50
< 0.50
< 0.50
< 0.30

< 0.50


< 2.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00
2.40

< 0.50


< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50


< 1.00

< 0.50
< 4.00
< 0.40

< 2.00

< 2.00
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.45.b URCIS (Round 1) Data-tert-Butylbenzene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
671
131

448
144
5
1
10

1,163


213
357
524
13

983

1,553
85
2

297


793
590
8
356
2,654
335
303


3

992
57
145

12,836

12,353
TOTAL #
SAMPLES
1,768
351

1,099
1,109
8
48
53

2,462


728
1,889
2,076
22

1,749

2,657
323
2

644


1,618
1,595
148
2,091
15,953
444
1,221


10

3,987
170
313

44,538

41 ,833
#GW
SAMPLES
1,497
244

935
1,058
5
0
44

1,865


485
1,486
1,119
18

1,375

2,589
297
2

569


1,431
1,475
136
1,561
15,035
363
434


0

3,656
64
259

38,002

35,939
#SW
SAMPLES
271
107

164
51
3
48
9

597


243
403
957
4

374

68
26
0

75


187
120
12
530
918
81
787


10

331
106
54

6,536

5,894
% TOTAL
SAMPLES
>MRL
0.17%
1 .99%

0.64%
0.00%
0.00%
0.00%
0.00%

0.08%


0.55%
0.00%
0.00%
0.00%

0.06%

0.04%
0.00%
100.00%

0.00%


0.25%
0.00%
0.00%
0.05%
0.01%
0.00%
0.08%


0.00%

0.03%
0.00%
0.00%

0.08%

0.08%
%GW
SAMPLES
>MRL
0.20%
2.46%

0.32%
0.00%
0.00%
0.00%
0.00%

0.11%


0.82%
0.00%
0.00%
0.00%

0.07%

0.04%
0.00%
100.00%

0.00%


0.28%
0.00%
0.00%
0.06%
0.01%
0.00%
0.00%


0.00%

0.03%
0.00%
0.00%

0.08%

0.08%
%SW
SAMPLES
>MRL
0.00%
0.93%

2.44%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.13%


0.00%

0.00%
0.00%
0.00%

0.09%

0.10%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.14
< 0.50
< 0.30

< 0.50


< 0.02
< 0.10
< 0.50
< 0.50

< 0.10

< 0.20
< 0.20
1.00

< 0.50


< 0.00
< 0.00
< 0.20
< 0.10
< 0.20
< 0.50
< 0.06


< 1.00

< 0.50
< 0.50
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
1.00

< 3.00
< 0.50
< 0.50
< 0.50
< 0.30

< 0.50


< 2.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00
2.40

< 0.50


< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50


< 1.00

< 0.50
< 4.00
< 0.40

< 2.00

< 2.00
MAX
VALUE
(M9/L)
0.70
9.00

10.00
< 0.50
< 0.50
< 0.50
< 0.30

1.80


0.15
< 5.00
< 1.00
< 0.50

0.10

0.50
< 2.00
2.40

< 0.50


1.09
< 5.00
< 0.20
0.60
2.00
< 0.50
3.50


< 1.00

0.50
< 4.00
< 1.00

10.00

10.00
MIN
DETECTS
(M9/L)
0.50
0.70

0.05





0.50


0.02




0.10

0.50

1.00




0.05


0.60
2.00

3.50




0.50



0.02

0.02
MEDIAN
DETECTS
(M9/L)
0.50
1.00

10.00





1.15


0.15




0.10

0.50

1.70




0.53


0.60
2.00

3.50




0.50



0.80

0.80
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.45.C URCIS (Round 1 ) Data- tert-Butylbenzene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,768
351

1,099
1,109
8
48
53

2,462


728
1,889
2,076
22

1,749

2,657
323
2

644


1,618
1,595
148
2,091
15,953
444
1,221


10

3,987
170
313

44,538

41,833
TOTAL
UNIQUE
PWS
671
131

448
144
5
1
10

1,163


213
357
524
13

983

1,553
85
2

297


793
590
8
356
2,654
335
303


3

992
57
145

12,836

12,353
#GW
PWS
545
93

407
132
3
0
8

1,054


149
321
291
9

936

1,529
71
2

254


782
555
7
252
2,492
306
156


0

937
26
116

11,433

11,081
# SW PWS
131
42

47
18
3
1
2

109


64
37
233
4

50

28
14
0

44


11
35
2
123
166
29
147


3

77
31
38

1,489

1,337
% PWS
>MRL
0.45%
3.82%

0.89%
0.00%
0.00%
0.00%
0.00%

0.09%


0.47%
0.00%
0.00%
0.00%

0.10%

0.06%
0.00%
100.00%

0.00%


0.50%
0.00%
0.00%
0.28%
0.08%
0.00%
0.33%


0.00%

0.10%
0.00%
0.00%

0.21%

0.19%
%GW
PWS
>MRL
0.55%
4.30%

0.74%
0.00%
0.00%
0.00%
0.00%

0.09%


0.67%
0.00%
0.00%
0.00%

0.11%

0.07%
0.00%
100.00%

0.00%


0.51%
0.00%
0.00%
0.40%
0.08%
0.00%
0.00%


0.00%

0.11%
0.00%
0.00%

0.21%

0.19%
%sw
PWS
>MRL
0.00%
2.38%

2.13%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.68%


0.00%

0.00%
0.00%
0.00%

0.20%

0.22%
% PWS
> 1/2 MCL

















%GW
PWS
> 1/2 MCL

















%SW
PWS
> 1/2 MCL

















% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level (HRL), Maximum Contaminant
Level (MCL), or Health Advisory Level (HAL) for tert-Butylbenzene.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.46.a URCIS (Round 1) Data-1,1,1,2- Tetrachloroethane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
660
131

940
148
9
1
13
115
1,161
127
1,002
1,302
365
524
13

978

1,565
85

565
297


1,499
590
8
355
2,655
335
303

420
3
1
992
137
145

17,444

16,956
GWPWS
531
93

871
133
7
0
11
28
1,052
112
963
1,187
327
291
9

934

1,540
71

523
254


1,474
555
7
252
2,492
306
156

400
0
1
937
63
116

15,696

15,338
SWPWS
134
42

105
21
4
1
2
98
109
16
39
115
39
233
4

45

29
14

57
44


25
35
2
122
167
29
147

34
3
0
77
75
38

1,905

1,753
% PWS >
MRL
0.15%
4.58%

0.00%
2.03%
22.22%
0.00%
0.00%
0.87%
0.00%
0.79%
0.00%
0.23%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.18%
1.01%


0.27%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

1 .67%
0.00%
100.00%
0.00%
0.00%
0.69%

0.19%

0.18%
%GW
PWS>
MRL
0.19%
1 .08%

0.00%
2.26%
14.29%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.25%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.79%


0.27%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

1 .50%
0.00%
100.00%
0.00%
0.00%
0.00%

0.14%

0.13%
%sw
PWS>
MRL
0.00%
1 1 .90%

0.00%
0.00%
25.00%
0.00%
0.00%
1 .02%
0.00%
6.25%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

1 .75%
2.27%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

2.94%
0.00%
0.00%
0.00%
0.00%
2.63%

0.63%

0.63%
% PWS
>HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
99% VALUE
(M9/L)
< 0.00
0.60

< 1.00
< 0.50
4.50
< 0.50
< 0.50
< 0.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.20
< 2.00

< 1.00
< 0.50


< 1.00
< 1.00
< 0.20
< 1.00
< 0.50
< 0.50
< 0.50

< 10.00
< 1.00
0.50
< 0.50
< 4.00
< 1.00

< 1.00

< 1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > HAL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HAL.
The Health Advisory Limit (HAL) for 1,1,1,2- Tetrachloroethane is 0.07 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.46.b URCIS (Round 1) Data-1,1,1,2- Tetrachloroethane Occurrence in Public Water Systems- Based on Number of Samp
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
660
131

940
148
9
1
13
115
1,161
127
1,002
1,302
365
524
13

978

1,565
85

565
297


1,499
590
8
355
2,655
335
303

420
3
1
992
137
145

17,444

16,956
TOTAL #
SAMPLES
1,602
351

2,876
1,063
35
62
333
158
2,462
1,221
1,909
6,001
1,929
2,076
22

1,595

2,757
323

1,624
644


3,115
1,595
148
2,156
16,085
444
1,220

1,318
10
1
3,987
389
313

59,824

56,734
#GW
SAMPLES
1,316
244

2,235
1,009
31
0
189
46
1,864
1,081
1,697
5,034
1,508
1,119
18

1,277

2,678
297

1,376
569


2,760
1,475
136
1,614
15,165
363
433

1,205
0
1
3,656
164
259

50,819

48,533
#SW
SAMPLES
286
107

641
54
4
62
144
112
598
140
212
967
421
957
4

318

79
26

248
75


355
120
12
542
920
81
787

113
10
0
331
225
54

9,005

8,201
% TOTAL
SAMPLES
>MRL
0.06%
1 .99%

0.00%
0.38%
5.71%
0.00%
0.00%
0.63%
0.00%
0.16%
0.00%
0.08%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.06%
0.47%


0.19%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.91%
0.00%
100.00%
0.00%
0.00%
0.32%

0.08%

0.08%
%GW
SAMPLES
>MRL
0.08%
0.41%

0.00%
0.40%
3.23%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.10%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.35%


0.22%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.91%
0.00%
100.00%
0.00%
0.00%
0.00%

0.06%

0.06%
%sw
SAMPLES
>MRL
0.00%
5.61%

0.00%
0.00%
25.00%
0.00%
0.00%
0.89%
0.00%
1 .43%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.40%
1 .33%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.88%
0.00%
0.00%
0.00%
0.00%
1 .85%

0.16%

0.16%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.10
< 0.00
< 0.05
< 0.00
< 0.20
< 0.00
< 0.50
< 0.00
< 0.20
< 0.06
< 0.06
< 0.50
< 0.50

< 0.20

< 0.20
< 0.20

< 0.50
< 0.50


< 0.00
< 0.00
< 0.20
< 0.05
< 0.20
< 0.50
< 0.00

< 0.00
< 1.00
0.50
< 0.50
< 0.03
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
0.60

< 1.00
< 0.50
4.50
< 0.50
< 0.50
< 0.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50

< 0.50

< 0.20
< 2.00

< 1.00
< 0.50


< 1.00
< 1.00
< 0.20
< 1.00
< 0.50
< 0.50
< 0.50

< 10.00
< 1.00
0.50
< 0.50
< 4.00
< 1.00

< 1.00

< 1.00
MAX
VALUE
(M9/L)
0.59
6.10

< 10.00
7.00
4.50
< 0.50
< 0.50
1.00
< 0.50
1.20
< 1.00
0.50
< 5.00
< 1.00
< 0.50

< 0.50

< 2.00
< 2.00

1.66
7.00


9.20
< 5.00
< 0.20
< 10.00
< 1.00
< 0.50
< 0.50

1.00
< 1.00
0.50
< 0.50
< 4.00
0.20

9.20

9.20
MIN
DETECTS
(M9/L)
0.59
0.50


0.50
0.32


1.00

1.20

0.06









1.66
0.60


0.70







0.30

0.50


0.20

0.06

0.06
MEDIAN
DETECTS
(M9/L)
0.59
0.60


0.55
2.41


1.00

1.20

0.12









1.66
1.02


1.55







0.50

0.50


0.20

0.57

0.59
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                 Occurrence of Unregulated Contaminants in Public Water Systems
Table A. 46. c URCIS (Round 1) Data- 1,1,1,2- Tetrachloroethane Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,602
351

2,876
1,063
35
62
333
158
2,462
1,221
1,909
6,001
1,929
2,076
22

1,595

2,757
323

1,624
644


3,115
1,595
148
2,156
16,085
444
1,220

1,318
10
1
3,987
389
313

59,824

56,734
TOTAL
UNIQUE
PWS
660
131

940
148
9
1
13
115
1,161
127
1,002
1,302
365
524
13

978

1,565
85

565
297


1,499
590
8
355
2,655
335
303

420
3
1
992
137
145

17,444

16,956
# GW PWS
531
93

871
133
7
0
11
28
1,052
112
963
1,187
327
291
9

934

1,540
71

523
254


1,474
555
7
252
2,492
306
156

400
0
1
937
63
116

15,696

15,338
# SW PWS
134
42

105
21
4
1
2
98
109
16
39
115
39
233
4

45

29
14

57
44


25
35
2
122
167
29
147

34
3
0
77
75
38

1,905

1,753
% PWS
>MRL
0.15%
4.58%

0.00%
2.03%
22.22%
0.00%
0.00%
0.87%
0.00%
0.79%
0.00%
0.23%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.18%
1.01%


0.27%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

1.67%
0.00%
100.00%
0.00%
0.00%
0.69%

0.19%

0.18%
%GW
PWS
>MRL
0.19%
1 .08%

0.00%
2.26%
14.29%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.25%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.79%


0.27%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

1 .50%
0.00%
100.00%
0.00%
0.00%
0.00%

0.14%

0.13%
%sw
PWS
>MRL
0.00%
11.90%

0.00%
0.00%
25.00%
0.00%
0.00%
1.02%
0.00%
6.25%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

1.75%
2.27%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

2.94%
0.00%
0.00%
0.00%
0.00%
2.63%

0.63%

0.63%
% PWS
> 1/2 HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
> 1/2 HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
> 1/2 HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for labors
"% > HAL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HAL.
The Health Advisory Limit (HAL) for 1,1,1,2- Tetrachloroethane is 0.07 pg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.47.a URCIS (Round 1) Data-1,1,2,2-Tetrachloroethane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
661
131

944
3,522
9
1
13
217
1,161
127
1,002
1,302
311
524
13
2
986
1
1,565
85

565
297
1

1,511
590
8
355
2,656
335
303

423
3
1
992
137
145

20,899

20,407
GWPWS
532
93

874
3,495
7
0
11
42
1,052
112
963
1,187
280
291
9
1
940
1
1,540
71

523
254
1

1,486
555
7
252
2,493
306
156

403
0
1
937
63
116

19,054

18,693
SWPWS
134
42

106
37
3
1
2
196
109
16
39
115
32
233
4
1
51
0
29
14

57
44
0

25
35
2
122
167
29
147

34
3
0
77
75
38

2,019

1,867
% PWS >
MRL
0.30%
2.29%

0.00%
0.31%
0.00%
0.00%
15.38%
4.15%
0.00%
0.00%
0.00%
0.46%
0.64%
0.00%
0.00%
100.00%
0.10%
100.00%
0.19%
0.00%

0.00%
0.34%
100.00%

0.40%
0.00%
12.50%
0.56%
0.04%
1 1 .64%
0.00%

1 .65%
0.00%
100.00%
0.00%
0.00%
0.00%

0.48%

0.45%
%GW
PWS>
MRL
0.19%
2.15%

0.00%
0.31%
0.00%
0.00%
18.18%
4.76%
0.00%
0.00%
0.00%
0.25%
0.71%
0.00%
0.00%
100.00%
0.00%
100.00%
0.19%
0.00%

0.00%
0.39%
100.00%

0.40%
0.00%
14.29%
0.40%
0.04%
11.11%
0.00%

1 .49%
0.00%
100.00%
0.00%
0.00%
0.00%

0.42%

0.39%
%sw
PWS>
MRL
0.75%
2.38%

0.00%
0.00%
0.00%
0.00%
0.00%
3.57%
0.00%
0.00%
0.00%
2.61%
0.00%
0.00%
0.00%
100.00%
1 .96%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.82%
0.00%
17.24%
0.00%

2.94%
0.00%
0.00%
0.00%
0.00%
0.00%

1 .04%

1 .02%
% PWS
>HAL
0.30%
0.00%

0.00%
0.09%
0.00%
0.00%
7.69%
0.00%
0.00%
0.00%
0.00%
0.08%
0.32%
0.00%
0.00%
50.00%
0.00%
100.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.26%
0.00%
0.00%
0.28%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.07%

0.05%
%GW
PWS
>HAL
0.19%
0.00%

0.00%
0.09%
0.00%
0.00%
9.09%
0.00%
0.00%
0.00%
0.00%
0.00%
0.36%
0.00%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.27%
0.00%
0.00%
0.40%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.06%

0.05%
%sw
PWS
>HAL
0.75%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.87%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.15%

0.11%
99% VALUE
(M9/L)
< 0.00
< 0.50

< 2.00
< 0.50
< 5.00
< 0.50
< 0.50
1.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50
2.20
< 0.50
13.00
< 1.00
< 2.00

< 1.00
< 0.50
1.20

< 1.00
< 1.00
< 0.20
< 1.00
< 1.00
0.15
< 0.50

5.00
< 1.00
1.10
< 0.50
< 4.00
< 0.40

< 1.00

< 1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > HAL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HAL.
The Health Advisory Level (HAL) for 1,1,2,2-Tetrachloroethane is 2 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.47.b URCIS (Round 1) Data- 1,1,2,2-Tetrachloroethane Occurrence in Public Water Systems- Based on Number of Sampl
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
661
131

944
3,522
9
1
13
217
1,161
127
1,002
1,302
311
524
13
2
986
1
1,565
85

565
297
1

1,511
590
8
355
2,656
335
303

423
3
1
992
137
145

20,899

20,407
TOTAL #
SAMPLES
1,610
351

2,932
1 1 ,667
33
62
333
315
2,460
1,221
1,908
6,002
1,724
2,076
22
2
1,909
1
2,756
323

1,624
644
1

3,130
1,595
148
2,160
16,084
444
1,220

1,328
10
1
3,987
388
313

70,784

67,688
#GW
SAMPLES
1,323
244

2,272
1 1 ,564
30

189
70
1,861
1,081
1,697
5,035
1,338
1,119
18
1
1,441
1
2,677
297

1,376
569
1

2,775
1,475
136
1,618
15,166
363
433

1,215
0
1
3,656
164
259

61 ,465

59,173
#SW
SAMPLES
287
107

660
103
3
62
144
245
599
140
211
967
386
957
4
1
468
0
79
26

248
75
0

355
120
12
542
918
81
787

113
10
0
331
224
54

9,319

8,515
% TOTAL
SAMPLES
>MRL
0.12%
0.85%

0.00%
0.12%
0.00%
0.00%
0.60%
3.17%
0.00%
0.00%
0.00%
0.10%
0.17%
0.00%
0.00%
100.00%
0.05%
100.00%
0.11%
0.00%

0.00%
0.16%
100.00%

0.35%
0.00%
0.68%
0.09%
0.01%
8.78%
0.00%

0.83%
0.00%
100.00%
0.00%
0.00%
0.00%

0.16%

0.16%
%GW
SAMPLES
>MRL
0.08%
0.82%

0.00%
0.12%
0.00%
0.00%
1 .06%
4.29%
0.00%
0.00%
0.00%
0.06%
0.22%
0.00%
0.00%
100.00%
0.00%
100.00%
0.11%
0.00%

0.00%
0.18%
100.00%

0.40%
0.00%
0.74%
0.06%
0.01%
9.37%
0.00%

0.82%
0.00%
100.00%
0.00%
0.00%
0.00%

0.15%

0.15%
%SW
SAMPLES
>MRL
0.35%
0.93%

0.00%
0.00%
0.00%
0.00%
0.00%
2.86%
0.00%
0.00%
0.00%
0.31 %
0.00%
0.00%
0.00%
100.00%
0.21%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.18%
0.00%
6.17%
0.00%

0.88%
0.00%
0.00%
0.00%
0.00%
0.00%

0.23%

0.22%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.04
< 0.50
< 0.20
< 0.00
< 0.50
< 0.00
< 0.40
< 0.02
< 0.10
< 0.50
< 0.50
0.63
< 0.10
13.00
< 0.20
< 0.20

< 0.50
< 0.07
1.20

< 0.00
< 0.00
< 0.00
< 0.04
< 0.00
< 0.15
< 0.01

< 0.00
< 1.00
1.10
< 0.50
< 0.03
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
< 0.50

< 2.00
< 0.50
< 5.00
< 0.50
< 0.50
1.00
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50
2.20
< 0.50
13.00
< 1.00
< 2.00

< 1.00
< 0.50
1.20

< 1.00
< 1.00
< 0.20
< 1.00
< 1.00
0.15
< 0.50

5.00
< 1.00
1.10
< 0.50
< 4.00
< 0.40

< 1.00

< 1.00
MAX
VALUE
(M9/L)
200.00
0.90

< 10.00
5.80
< 5.00
< 0.50
9.00
1.00
< 0.50
< 0.30
< 1.00
2.50
2.74
< 1.00
< 0.50
2.20
0.20
13.00
0.20
< 2.00

< 1.00
0.07
1.20

112.00
< 5.00
1.00
3.00
2.00
0.22
< 0.50

1.00
< 1.00
1.10
< 0.50
< 4.00
< 1.00

200.00

200.00
MIN
DETECTS
(M9/L)
49.00
0.50


0.50


0.40
0.05



0.11
0.49


0.63
0.20
13.00
0.20



0.07
1.20

0.52

1.00
2.00
2.00
0.15


0.30

1.10




0.05

0.05
MEDIAN
DETECTS
(M9/L)
124.50
0.80


1.55


4.70
0.80



0.50
0.88


1.42
0.20
13.00
0.20



0.07
1.20

2.80

1.00
2.50
2.00
0.15


0.50

1.10




0.50

0.50
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                               Occurrence of Unregulated Contaminants in Public Water Systems
Table A.47.c  URCIS (Round 1) Data- 1,1,2,2-Tetrachloroethane Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,610
351

2,932
1 1 ,667
33
62
333
315
2,460
1,221
1,908
6,002
1,724
2,076
22
2
1,909
1
2,756
323

1,624
644
1

3,130
1,595
148
2,160
16,084
444
1,220

1,328
10
1
3,987
388
313

70,784

67,688
TOTAL
UNIQUE
PWS
661
131

944
3,522
9
1
13
217
1,161
127
1,002
1,302
311
524
13
2
986
1
1,565
85

565
297
1

1,511
590
8
355
2,656
335
303

423
3
1
992
137
145

20,899

20,407
# GW PWS
532
93

874
3,495
7

11
42
1,052
112
963
1,187
280
291
9
1
940
1
1,540
71

523
254
1

1,486
555
7
252
2,493
306
156

403
0
1
937
63
116

19,054

18,693
# SW PWS
134
42

106
37
3
1
2
196
109
16
39
115
32
233
4
1
51
0
29
14

57
44
0

25
35
2
122
167
29
147

34
3
0
77
75
38

2,019

1,867
% PWS
>MRL
0.30%
2.29%

0.00%
0.31%
0.00%
0.00%
15.38%
4.15%
0.00%
0.00%
0.00%
0.46%
0.64%
0.00%
0.00%
100.00%
0.10%
100.00%
0.19%
0.00%

0.00%
0.34%
100.00%

0.40%
0.00%
12.50%
0.56%
0.04%
11.64%
0.00%

1.65%
0.00%
100.00%
0.00%
0.00%
0.00%

0.48%

0.45%
%GW
PWS
>MRL
0.19%
2.15%

0.00%
0.31%
0.00%
0.00%
18.18%
4.76%
0.00%
0.00%
0.00%
0.25%
0.71%
0.00%
0.00%
100.00%
0.00%
100.00%
0.19%
0.00%

0.00%
0.39%
100.00%

0.40%
0.00%
14.29%
0.40%
0.04%
11.11%
0.00%

1 .49%
0.00%
100.00%
0.00%
0.00%
0.00%

0.42%

0.39%
%SW
PWS
>MRL
0.75%
2.38%

0.00%
0.00%
0.00%
0.00%
0.00%
3.57%
0.00%
0.00%
0.00%
2.61%
0.00%
0.00%
0.00%
100.00%
1.96%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.82%
0.00%
17.24%
0.00%

2.94%
0.00%
0.00%
0.00%
0.00%
0.00%

1.04%

1.02%
% PWS
> 1/2 HAL
0.30%
0.00%

0.00%
0.17%
0.00%
0.00%
7.69%
0.00%
0.00%
0.00%
0.00%
0.08%
0.32%
0.00%
0.00%
50.00%
0.00%
100.00%
0.00%
0.00%

0.00%
0.00%
100.00%

0.26%
0.00%
0.00%
0.56%
0.04%
0.00%
0.00%

0.00%
0.00%
100.00%
0.00%
0.00%
0.00%

0.11%

0.07%
%GW
PWS
> 1/2 HAL
0.19%
0.00%

0.00%
0.17%
0.00%
0.00%
9.09%
0.00%
0.00%
0.00%
0.00%
0.00%
0.36%
0.00%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%

0.00%
0.00%
100.00%

0.27%
0.00%
0.00%
0.40%
0.04%
0.00%
0.00%

0.00%
0.00%
100.00%
0.00%
0.00%
0.00%

0.09%

0.07%
%sw
PWS
> 1/2 HAL
0.75%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.87%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.82%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.20%

0.11%
% PWS
>HAL
0.30%
0.00%

0.00%
0.09%
0.00%
0.00%
7.69%
0.00%
0.00%
0.00%
0.00%
0.08%
0.32%
0.00%
0.00%
50.00%
0.00%
100.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.26%
0.00%
0.00%
0.28%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.07%

0.05%
%GW
PWS
>HAL
0.19%
0.00%

0.00%
0.09%
0.00%
0.00%
9.09%
0.00%
0.00%
0.00%
0.00%
0.00%
0.36%
0.00%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.27%
0.00%
0.00%
0.40%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.06%

0.05%
%sw
PWS
>HAL
0.75%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.87%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.15%

0.11%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for labors
"% > HAL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HAL.
The Health Advisory Level (HAL) for 1,1,2,2-Tetrachloroethane is 2 pg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.48.a URCIS (Round 1) Data-Tetrachloroethylene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
707
132

941
3,537
19
1
13

1,161
127
1,002
1,300
370
524
13
43
844
18
1,560
85
6
565
297
32
22
1,519
590
8
357
2,655

303
7
406
3
8
992
137
145

20,449

19,814
GWPWS
575
94

872
3,509
16
0
11

1,052
112
963
1,186
332
291
9
38
798
16
1,536
71
6
523
254
32
22
1,494
555
7
253
2,492

156
7
388
0
8
937
63
116

18,794

18,298
SWPWS
138
42

105
41
5
1
2

109
16
39
114
39
233
4
8
51
2
28
14
0
57
44
0
0
25
35
2
123
167

147
0
32
3
0
77
75
38

1,816

1,652
% PWS >
MRL
2.40%
15.91%

0.85%
6.56%
52.63%
100.00%
30.77%

0.95%
3.15%
1 .60%
3.00%
3.24%
1 .34%
15.38%
93.02%
2.49%
100.00%
2.12%
3.53%
100.00%
3.54%
13.80%
100.00%
100.00%
4.41%
0.68%
37.50%
4.48%
1 .69%

3.63%
85.71%
1 .72%
0.00%
87.50%
3.33%
2.92%
4.83%

4.06%

3.33%
%GW
PWS>
MRL
2.61%
18.09%

0.69%
6.55%
62.50%
0.00%
27.27%

1 .05%
2.68%
1 .66%
2.87%
3.31%
1 .37%
22.22%
100.00%
2.26%
100.00%
2.08%
4.23%
100.00%
3.63%
15.75%
100.00%
100.00%
4.28%
0.72%
42.86%
5.53%
1 .73%

4.49%
85.71%
1 .55%
0.00%
87.50%
3.09%
6.35%
5.17%

4.16%

3.38%
%SW
PWS>
MRL
1 .45%
9.52%

2.86%
7.32%
20.00%
100.00%
50.00%

0.00%
6.25%
0.00%
4.39%
5.13%
1 .29%
0.00%
62.50%
5.88%
100.00%
3.57%
0.00%
0.00%
1 .75%
2.27%
0.00%
0.00%
12.00%
0.00%
0.00%
1 .63%
1 .20%

2.72%
0.00%
3.13%
0.00%
0.00%
5.19%
0.00%
2.63%

3.08%

2.66%
% PWS
>MCL
0.28%
3.79%

0.32%
2.29%
31 .58%
0.00%
15.38%

0.26%
0.79%
0.20%
0.54%
2.43%
0.38%
7.69%
32.56%
0.12%
50.00%
0.19%
3.53%
50.00%
0.18%
2.69%
28.13%
27.27%
1 .25%
0.17%
25.00%
0.56%
0.68%

0.99%
71 .43%
0.49%
0.00%
0.00%
0.60%
2.19%
0.69%

1.19%

0.91%
%GW
PWS
>MCL
0.17%
5.32%

0.34%
2.31%
37.50%
0.00%
18.18%

0.29%
0.00%
0.21%
0.59%
2.11%
0.00%
11.11%
34.21%
0.13%
50.00%
0.20%
4.23%
50.00%
0.19%
2.76%
28.13%
27.27%
1.14%
0.18%
28.57%
0.40%
0.68%

1 .92%
71 .43%
0.52%
0.00%
0.00%
0.53%
4.76%
0.86%

1 .22%

0.93%
%sw
PWS
>MCL
0.72%
0.00%

0.00%
0.00%
20.00%
0.00%
0.00%

0.00%
6.25%
0.00%
0.00%
5.13%
0.86%
0.00%
25.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
2.27%
0.00%
0.00%
8.00%
0.00%
0.00%
0.81%
0.60%

0.00%
0.00%
0.00%
0.00%
0.00%
1 .30%
0.00%
0.00%

0.61%

0.67%
99% VALUE
(M9/L)
7.10
10.30

< 10.00
27.10
694.06
0.50
16.50

0.60
2.70
2.50
2.00
6.30
< 1.00
10.90
70.00
1.40
79.00
0.40
5.80
24.40
7.00
7.10
51.60
105.00
8.20
< 1.00
7.00
1.00
2.50

0.90
24.00
5.40
< 0.50
3.00
1.60
4.50
0.60

15.60

13.20
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Tetrachloroethylene is 5 |jg/L.
The highlighted States are part of the  URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.48.b URCIS (Round 1) Data-Tetrachloroethylene Occurrence in Public Water Systems- Based on the Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
707
132

941
3,537
19
1
13

1,161
127
1,002
1,300
370
524
13
43
844
18
1,560
85
6
565
297
32
22
1,519
590
8
357
2,655

303
7
406
3
8
992
137
145

20,449

19,814
TOTAL #
SAMPLES
1,931
359

2,952
18,594
166
62
336

2,460
1,221
2,001
5,338
2,242
2,312
22
206
1,786
301
2,745
328
82
1,624
648
93
72
3,137
1,595
148
2,416
16,079

1,220
15
1,278
10
37
3,987
655
313

78,771

74,477
#GW
SAMPLES
1,626
251

2,293
18,456
146
0
191

1,861
1,081
1,789
4,332
1,544
1,172
18
193
1,306
145
2,667
296
82
1,376
573
93
72
2,782
1,475
136
1,743
15,159

433
15
1,171
0
37
3,656
204
259

68,633

65,466
#SW
SAMPLES
305
108

659
138
20
62
145

599
140
212
1,006
698
1,140
4
13
480
156
78
32
0
248
75
0
0
355
120
12
673
920

787
0
107
10
0
331
451
54

10,138

9,011
% TOTAL
SAMPLES
>MRL
3.06%
18.38%

0.91 %
34.26%
77.71%
1.61%
13.69%

1.14%
2.46%
3.15%
2.60%
6.42%
0.43%
18.18%
94.17%
2.86%
100.00%
1 .57%
1 .83%
100.00%
12.32%
1 1 .57%
100.00%
100.00%
8.26%
0.50%
10.81%
1.70%
1.79%

1 .23%
93.33%
4.46%
0.00%
54.05%
3.11%
1.37%
3.51 %

1 1 .55%

10.84%
%GW
SAMPLES
>MRL
3.51 %
24.30%

1 .05%
34.47%
80.14%
0.00%
23.04%

1.50%
1.02%
3.52%
3.09%
8.10%
0.60%
22.22%
95.85%
3.68%
100.00%
1 .57%
2.03%
100.00%
14.39%
12.74%
100.00%
100.00%
8.52%
0.54%
1 1 .76%
2.07%
1.85%

2.31 %
93.33%
4.78%
0.00%
54.05%
3.25%
4.41%
3.86%

12.82%

12.16%
%SW
SAMPLES
>MRL
0.66%
4.63%

0.46%
7.25%
60.00%
1.61%
1 .38%

0.00%
13.57%
0.00%
0.50%
2.72%
0.26%
0.00%
69.23%
0.63%
100.00%
1 .28%
0.00%
0.00%
0.81%
2.67%
0.00%
0.00%
6.20%
0.00%
0.00%
0.74%
0.76%

0.64%
0.00%
0.93%
0.00%
0.00%
1.51%
0.00%
1 .85%

2.96%

1.28%
MIN VALUE
(M9/L)
< 0.00
< 0.10

< 0.10
< 0.00
< 0.00
< 0.50
< 0.00

< 0.50
< 0.00
< 0.10
< 0.04
< 0.01
< 0.50
< 0.50
< 0.00
< 0.10
1.00
< 0.20
< 0.20
0.50
< 0.00
< 0.07
0.30
0.32
< 0.00
< 0.00
< 0.00
< 0.04
< 0.20

< 0.04
< 0.00
< 0.00
< 0.50
< 0.00
< 0.50
< 0.03
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
7.10
10.30

< 10.00
27.10
694.06
0.50
16.50

0.60
2.70
2.50
2.00
6.30
< 1.00
10.90
70.00
1.40
79.00
0.40
5.80
24.40
7.00
7.10
51.60
105.00
8.20
< 1.00
7.00
1.00
2.50

0.90
24.00
5.40
< 0.50
3.00
1.60
4.50
0.60

15.60

13.20
MAX VALUE
(M9/L)
31.00
21.20

899.00
301 .00
924.00
0.50
106.00

7.80
14.80
32.00
35.00
31.00
60.00
10.90
200.00
7.00
211.00
14.00
21.00
24.40
3,300.00
58.10
51.60
105.00
112.00
22.20
7.20
22.00
99.20

45.00
24.00
21.20
< 0.50
3.00
47.40
273.00
6.20

3,300.00

3,300.00
MIN
DETECTS
(M9/L)
0.20
0.10

0.30
0.04
0.20
0.50
0.30

0.50
0.30
0.30
0.04
0.01
1.00
1.10
0.03
0.10
1.00
0.20
1.50
0.50
0.50
0.07
0.30
0.32
0.13
0.60
0.20
0.50
0.20

0.40
0.80
0.10

0.60
0.50
2.00
0.20

0.01

0.01
MEDIAN
DETECTS
(M9/L)
5.00
1.43

1.00
2.09
5.22
0.50
1.95

2.15
2.05
1.40
1.70
3.00
2.00
1.40
2.00
1.00
5.00
0.70
6.35
2.20
1.95
1.02
1.60
2.95
1.70
5.50
0.60
1.06
3.47

3.10
6.55
4.00

1.10
1.20
8.00
0.50

2.00

2.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (1
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.48.C URCIS (Round 1) Data-Tetrachloroethylene Occurrence in Public Water Systems- Based on the Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,931
359

2,952
18,594
166
62
336

2,460
1,221
2,001
5,338
2,242
2,312
22
206
1,786
301
2,745
328
82
1,624
648
93
72
3,137
1,595
148
2,416
16,079

1,220
15
1,278
10
37
3,987
655
313

78,771

74,477
TOTAL
UNIQUE
PWS
707
132

941
3,537
19
1
13

1,161
127
1,002
1,300
370
524
13
43
844
18
1,560
85
6
565
297
32
22
1,519
590
8
357
2,655

303
7
406
3
8
992
137
145

20,449

19,814
#GW
PWS
575
94

872
3,509
16
0
11

1,052
112
963
1,186
332
291
9
38
798
16
1,536
71
6
523
254
32
22
1,494
555
7
253
2,492

156
7
388
0
8
937
63
116

18,794

18,298
#SW
PWS
138
42

105
41
5
1
2

109
16
39
114
39
233
4
8
51
2
28
14
0
57
44
0
0
25
35
2
123
167

147
0
32
3
0
77
75
38

1,816

1,652
% PWS
>MRL
2.40%
15.91%

0.85%
6.56%
52.63%
100.00%
30.77%

0.95%
3.15%
1.60%
3.00%
3.24%
1.34%
15.38%
93.02%
2.49%
100.00%
2.12%
3.53%
100.00%
3.54%
13.80%
100.00%
100.00%
4.41%
0.68%
37.50%
4.48%
1.69%

3.63%
85.71%
1.72%
0.00%
87.50%
3.33%
2.92%
4.83%

4.06%

3.33%
%GW
PWS
>MRL
2.61 %
18.09%

0.69%
6.55%
62.50%
0.00%
27.27%

1 .05%
2.68%
1 .66%
2.87%
3.31 %
1 .37%
22.22%
100.00%
2.26%
100.00%
2.08%
4.23%
100.00%
3.63%
15.75%
100.00%
100.00%
4.28%
0.72%
42.86%
5.53%
1 .73%

4.49%
85.71 %
1 .55%
0.00%
87.50%
3.09%
6.35%
5.17%

4.16%

3.38%
%SW
PWS
>MRL
1.45%
9.52%

2.86%
7.32%
20.00%
100.00%
50.00%

0.00%
6.25%
0.00%
4.39%
5.13%
1.29%
0.00%
62.50%
5.88%
100.00%
3.57%
0.00%
0.00%
1.75%
2.27%
0.00%
0.00%
12.00%
0.00%
0.00%
1.63%
1.20%

2.72%
0.00%
3.13%
0.00%
0.00%
5.19%
0.00%
2.63%

3.08%

2.66%
% PWS
> 1/2 MCL
0.42%
5.30%

0.32%
3.53%
36.84%
0.00%
15.38%

0.43%
0.79%
0.70%
0.77%
2.70%
0.57%
7.69%
44.19%
0.83%
77.78%
0.38%
3.53%
66.67%
0.35%
4.04%
37.50%
50.00%
2.17%
0.34%
25.00%
1 .68%
0.90%

1 .65%
85.71 %
0.49%
0.00%
12.50%
1.11%
2.92%
0.69%

1 .81 %

1 .43%
%GW
PWS
> 1/2 MCL
0.35%
7.45%

0.34%
3.53%
43.75%
0.00%
18.18%

0.48%
0.00%
0.73%
0.84%
2.71%
0.34%
11.11%
50.00%
0.75%
75.00%
0.39%
4.23%
66.67%
0.38%
4.33%
37.50%
50.00%
2.01%
0.36%
28.57%
1.98%
0.92%

2.56%
85.71%
0.52%
0.00%
12.50%
0.96%
6.35%
0.86%

1.88%

1.46%
%SW
PWS
> 1/2 MCL
0.72%
0.00%

0.00%
2.44%
20.00%
0.00%
0.00%

0.00%
6.25%
0.00%
0.00%
5.13%
0.86%
0.00%
25.00%
1 .96%
100.00%
0.00%
0.00%
0.00%
0.00%
2.27%
0.00%
0.00%
12.00%
0.00%
0.00%
0.81 %
0.60%

0.68%
0.00%
0.00%
0.00%
0.00%
2.60%
0.00%
0.00%

1 .21 %

0.97%
% PWS
>MCL
0.28%
3.79%

0.32%
2.29%
31.58%
0.00%
15.38%

0.26%
0.79%
0.20%
0.54%
2.43%
0.38%
7.69%
32.56%
0.12%
50.00%
0.19%
3.53%
50.00%
0.18%
2.69%
28.13%
27.27%
1.25%
0.17%
25.00%
0.56%
0.68%

0.99%
71.43%
0.49%
0.00%
0.00%
0.60%
2.19%
0.69%

1.19%

0.91%
%GW
PWS
>MCL
0.17%
5.32%

0.34%
2.31 %
37.50%
0.00%
18.18%

0.29%
0.00%
0.21 %
0.59%
2.11%
0.00%
11.11%
34.21 %
0.13%
50.00%
0.20%
4.23%
50.00%
0.19%
2.76%
28.13%
27.27%
1.14%
0.18%
28.57%
0.40%
0.68%

1 .92%
71 .43%
0.52%
0.00%
0.00%
0.53%
4.76%
0.86%

1 .22%

0.93%
%sw
PWS
>MCL
0.72%
0.00%

0.00%
0.00%
20.00%
0.00%
0.00%

0.00%
6.25%
0.00%
0.00%
5.13%
0.86%
0.00%
25.00%
0.00%
50.00%
0.00%
0.00%
0.00%
0.00%
2.27%
0.00%
0.00%
8.00%
0.00%
0.00%
0.81%
0.60%

0.00%
0.00%
0.00%
0.00%
0.00%
1.30%
0.00%
0.00%

0.61%

0.67%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the
The Maximum Contaminant Level (MCL) for Tetrachloroethylene is 5 ug/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.49.a URCIS (Round 1) Data-Toluene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
732
132
2
944
3,526
21
1
13
252
1,162
127
1,002
1,301
371
524
13
23
844
19
1,565
85
19
565
297
20
37
1,508
590
8
357
2,655

303
22
415
3
5
992
137
145

20,737

20,089
GWPWS
593
94
2
874
3,498
14
0
11
55
1,053
112
963
1,187
332
291
9
15
798
18
1,540
71
19
523
254
20
34
1,483
555
7
253
2,492

156
15
395
0
5
937
63
116

18,857

18,364
SWPWS
145
42
0
106
39
8
1
2
225
109
16
39
114
40
233
4
9
51
1
29
14
0
57
44
0
3
25
35
2
123
167

147
7
34
3
0
77
75
38

2,064

1,887
% PWS >
MRL
9.15%
28.03%
100.00%
0.32%
2.16%
52.38%
0.00%
0.00%
14.29%
0.26%
0.00%
2.50%
3.15%
5.12%
3.44%
7.69%
78.26%
2.84%
100.00%
5.81%
7.06%
100.00%
1 .59%
10.77%
100.00%
100.00%
2.65%
0.85%
37.50%
5.88%
4.60%

3.63%
100.00%
2.17%
66.67%
60.00%
2.22%
2.92%
6.90%

4.28%

3.50%
%GW
PWS>
MRL
7.59%
27.66%
100.00%
0.23%
2.00%
42.86%
0.00%
0.00%
14.55%
0.28%
0.00%
2.08%
2.70%
5.12%
2.41%
11.11%
73.33%
2.26%
100.00%
5.78%
8.45%
100.00%
0.76%
12.20%
100.00%
100.00%
2.63%
0.90%
42.86%
6.32%
4.65%

3.21%
100.00%
1 .77%
0.00%
60.00%
1.81%
1 .59%
6.90%

3.84%

3.10%
%sw
PWS>
MRL
15.86%
28.57%
0.00%
0.94%
15.38%
62.50%
0.00%
0.00%
13.33%
0.00%
0.00%
12.82%
7.89%
5.00%
4.72%
0.00%
88.89%
1 1 .76%
100.00%
6.90%
0.00%
0.00%
8.77%
2.27%
0.00%
100.00%
4.00%
0.00%
0.00%
4.07%
3.59%

4.08%
100.00%
5.88%
66.67%
0.00%
6.49%
4.00%
5.26%

8.19%

7.31%
% PWS
>MCL
0.14%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.17%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01%

0.01%
%sw
PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
99% VALUE
(M9/L)
4.10
20.00
15.3
< 1.00
0.40
330.71
< 0.50
< 0.60
12.40
< 0.50
< 0.30
1.00
0.30
0.59
1.20
21.14
260.00
0.30
57.00
0.80
2.00
963.60
< 1.00
11.40
1 1 1 .70
40.00
0.50
< 5.00
0.40
0.60
0.30

< 0.50
47.00
0.10
11.00
900.00
< 0.50
0.80
1.30

0.90

0.70
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Toluene is 100 |jg/L.
The highlighted States are part of the  URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.49.b  URCIS (Round 1) Data-Toluene Occurrence in Public Water Systems- Based of Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
732
132
2
944
3,526
21
1
13
252
1,162
127
1,002
1,301
371
524
13
23
844
19
1,565
85
19
565
297
20
37
1,508
590
8
357
2,655

303
22
415
3
5
992
137
145

20,737

20,089
TOTAL #
SAMPLES
2,026
356
4
2,923
1 1 ,542
57
46
333
380
2,464
1,221
1,976
5,333
1,947
2,311
22
30
1,786
28
2,744
323
26
1,623
645
29
47
3,123
1,595
148
2,105
16,085

1,220
26
1,283
10
5
3,987
385
313

70,507

67,268
#GW
SAMPLES
1,708
247
4
2,264
1 1 ,455
47
0
189
90
1,865
1,081
1,761
4,330
1,525
1,172
18
18
1,306
22
2,665
297
26
1,376
570
29
44
2,768
1,475
136
1,569
15,165

433
18
1,171
0
5
3,656
163
259

60,927

58,505
#SW
SAMPLES
318
109
0
659
87
10
46
144
290
599
140
215
1,003
422
1,139
4
12
480
6
79
26
0
247
75
0
3
355
120
12
536
920

787
8
112
10
0
331
222
54

9,580

8,763
% TOTAL
SAMPLES
>MRL
8.24%
14.61%
100.00%
0.10%
1 .03%
35.09%
0.00%
0.00%
1 1 .05%
0.16%
0.00%
1 .57%
1 .03%
2.41%
1.38%
4.55%
83.33%
1.79%
100.00%
4.15%
2.79%
100.00%
0.86%
6.82%
100.00%
100.00%
1.44%
0.88%
6.08%
1.38%
1.03%

0.98%
100.00%
1.17%
20.00%
60.00%
0.83%
1.30%
3.51 %

1 .86%

1.57%
%GW
SAMPLES
>MRL
7.67%
16.19%
100.00%
0.09%
0.98%
27.66%
0.00%
0.00%
12.22%
0.21%
0.00%
1 .48%
0.90%
2.89%
0.60%
5.56%
77.78%
1.68%
100.00%
4.17%
3.03%
100.00%
0.65%
7.37%
100.00%
100.00%
1.52%
0.95%
6.62%
1.40%
1.04%

1.15%
100.00%
0.94%
0.00%
60.00%
0.74%
1.23%
3.47%

1 .77%

1.48%
%SW
SAMPLES
>MRL
1 1 .32%
11.01%
0.00%
0.15%
8.05%
70.00%
0.00%
0.00%
10.69%
0.00%
0.00%
2.33%
1 .60%
0.71%
2.19%
0.00%
91 .67%
2.08%
100.00%
3.80%
0.00%
0.00%
2.02%
2.67%
0.00%
100.00%
0.85%
0.00%
0.00%
1.31%
0.87%

0.89%
100.00%
3.57%
20.00%
0.00%
1.81%
1.35%
3.70%

2.43%

2.16%
MIN VALUE
(M9/L)
< 0.00
< 0.45
0.60
< 0.05
< 0.00
0.00
< 0.50
< 0.30
< 0.00
< 0.50
< 0.00
< 0.20
< 0.02
< 0.09
< 0.50
< 0.50
< 0.10
< 0.10
1.00
< 0.10
< 0.20
0.50
< 0.50
< 0.28
0.30
0.48
< 0.00
< 0.00
< 0.20
< 0.10
< 0.20

< 0.01
0.90
< 0.00
< 1.00
< 0.00
< 0.50
< 0.20
< 0.01

< 0.00

< 0.00
99% VALUE
(M9/L)
4.10
20.00
15.30
< 1.00
0.40
330.71
< 0.50
< 0.60
12.40
< 0.50
< 0.30
1.00
0.30
0.59
1.20
21.14
260.00
0.30
57.00
0.80
2.00
963.60
< 1.00
11.40
1 1 1 .70
40.00
0.50
< 5.00
0.40
0.60
0.30

< 0.50
47.00
0.10
11.00
900.00
< 0.50
0.80
1.30

0.90

0.70
MAX VALUE
(M9/L)
2,200.00
169.50
15.30
18.00
60.00
330.71
< 0.50
< 0.60
69.10
7.90
< 1.00
28.00
11.00
10.00
790.00
21.14
260.00
1.00
57.00
8.90
18.60
963.60
6.00
168.00
111.70
40.00
740.00
3.70
0.40
9.00
108.00

6.00
47.00
25.00
11.00
900.00
283.00
40.00
6.20

2,200.00

2,200.00
MIN
DETECTS
(M9/L)
0.20
0.45
0.60
4.00
0.10
0.10


0.01
0.90

0.50
0.02
0.10
1.00
21.14
0.10
0.10
1.00
0.10
0.50
0.50
0.50
0.28
0.30
0.48
0.09
0.30
0.20
0.39
0.20

0.50
0.90
0.10
4.40
0.50
0.50
0.50
0.30

0.01

0.01
MEDIAN
DETECTS
(M9/L)
0.78
2.00
6.50
5.00
1.50
3.70


3.00
1.55

1.00
0.87
0.34
3.00
21.14
1.00
0.35
3.00
0.40
0.50
0.80
2.00
1.23
0.90
1.38
0.83
1.85
0.30
1.00
1.00

1.15
2.65
0.20
7.70
8.40
1.10
1.00
0.90

1.00

0.96
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (1
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.49.C  URCIS (Round 1) Data-Toluene Occurrence in Public Water Systems- Based of Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
2,026
356
4
2,923
11,542
57
46
333
380
2,464
1,221
1,976
5,333
1,947
2,311
22
30
1,786
28
2,744
323
26
1,623
645
29
47
3,123
1,595
148
2,105
16,085

1,220
26
1,283
10
5
3,987
385
313

70,507

67,268
TOTAL
UNIQUE
PWS
732
132
2
944
3,526
21
1
13
252
1,162
127
1,002
1,301
371
524
13
23
844
19
1,565
85
19
565
297
20
37
1,508
590
8
357
2,655

303
22
415
3
5
992
137
145

20,737

20,089
#GW
PWS
593
94
2
874
3,498
14
0
11
55
1,053
112
963
1,187
332
291
9
15
798
18
1,540
71
19
523
254
20
34
1,483
555
7
253
2,492

156
15
395
0
5
937
63
116

18,857

18,364
#SW
PWS
145
109
0
106
39
8
1
2
225
109
16
39
114
40
233
4
9
51
1
29
14
0
57
44
0
3
25
35
2
123
167

147
7
34
3
0
77
75
38

2,064

1,954
% PWS
>MRL
9.15%
28.03%
100.00%
0.32%
2.16%
52.38%
0.00%
0.00%
14.29%
0.26%
0.00%
2.50%
3.15%
5.12%
3.44%
7.69%
78.26%
2.84%
100.00%
5.81%
7.06%
100.00%
1.59%
10.77%
100.00%
100.00%
2.65%
0.85%
37.50%
5.88%
4.60%

3.63%
100.00%
2.17%
66.67%
60.00%
2.22%
2.92%
6.90%

4.28%

3.50%
%GW
PWS
>MRL
7.59%
27.66%
100.00%
0.23%
2.00%
42.86%
0.00%
0.00%
14.55%
0.28%
0.00%
2.08%
2.70%
5.12%
2.41 %
11.11%
73.33%
2.26%
100.00%
5.78%
8.45%
100.00%
0.76%
12.20%
100.00%
100.00%
2.63%
0.90%
42.86%
6.32%
4.65%

3.21 %
100.00%
1 .77%
0.00%
60.00%
1 .81 %
1 .59%
6.90%

3.84%

3.10%
%sw
PWS
>MRL
15.86%
11.01%
0.00%
0.94%
15.38%
62.50%
0.00%
0.00%
13.33%
0.00%
0.00%
12.82%
7.89%
5.00%
4.72%
0.00%
88.89%
11.76%
100.00%
6.90%
0.00%
0.00%
8.77%
2.27%
0.00%
100.00%
4.00%
0.00%
0.00%
4.07%
3.59%

4.08%
100.00%
5.88%
66.67%
0.00%
6.49%
4.00%
5.26%

8.19%

7.06%
% PWS
> 1/2 MCL
0.14%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.19%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
5.26%
0.00%
0.00%
0.00%
0.00%
0.07%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
20.00%
0.00%
0.00%
0.00%

0.02%

0.01 %
%GW
PWS
> 1/2 MCL
0.17%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.34%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
5.26%
0.00%
0.00%
0.00%
0.00%
0.07%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
20.00%
0.00%
0.00%
0.00%

0.03%

0.02%
%sw
PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>MCL
0.14%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.17%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01 %

0.01 %
%sw
PWS
>MCL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the
The Maximum Contaminant Level (MCL) for Toluene is 100 ug/L
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.50.a URCIS (Round 1) Data- trans-1,2-Dichloroethene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
661
131

943
3,518
8
1
13
200
1,162
127
1,002
1,301
369
524
13
10
844
3
1,565
85
2
565
297
2

1,525
590
8
356
2,633

302

412

1
992
137
145

20,447

19,945
GWPWS
532
93

873
3,488
6
0
11
36
1,053
112
963
1,187
331
291
9
9
798
3
1,540
71
2
523
254
2

1,500
555
7
253
2,475

155

392

1
937
63
116

18,641

18,267
SWPWS
134
42

106
38
3
1
2
181
109
16
39
114
39
233
4
1
51

29
14
0
57
44
0

25
35
2
122
162

147

34

0
77
75
38

1,974

1,825
% PWS >
MRL
0.15%
1 .53%

0.11%
0.74%
0.00%
0.00%
7.69%
8.50%
0.00%
0.00%
0.00%
0.85%
1 .90%
0.19%
0.00%
100.00%
0.47%
100.00%
0.13%
0.00%
100.00%
0.18%
3.03%
100.00%

1.11%
0.00%
0.00%
1 .69%
0.46%

0.66%

2.43%

100.00%
0.00%
0.73%
2.07%

0.74%

0.64%
%GW
PWS>
MRL
0.19%
1 .08%

0.11%
0.72%
0.00%
0.00%
9.09%
22.22%
0.00%
0.00%
0.00%
0.93%
1 .81 %
0.00%
0.00%
100.00%
0.38%
100.00%
0.13%
0.00%
100.00%
0.19%
3.54%
100.00%

1 .07%
0.00%
0.00%
1 .58%
0.48%

0.65%

2.30%

100.00%
0.00%
1 .59%
0.86%

0.70%

0.59%
%sw
PWS>
MRL
0.00%
2.38%

0.00%
2.63%
0.00%
0.00%
0.00%
5.52%
0.00%
0.00%
0.00%
0.00%
2.56%
0.43%
0.00%
100.00%
1 .96%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

4.00%
0.00%
0.00%
1 .64%
0.00%

0.68%

2.94%

0.00%
0.00%
0.00%
5.26%

1.17%

1.10%
% PWS
>MCL
0.00%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.01 %
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
0.00%

0.01 %

0.01 %
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
99%
VALUE
(M9/L)
< 0.00
< 0.50

< 1.00
< 1.00
< 5.00
< 0.50
< 0.50
11.10
< 0.50
< 0.30
< 1.00
< 1.00
0.21
< 1.00
< 0.50
28.00
< 0.50
80.00
< 0.20
< 2.00
2.30
< 1.00
1.40
2.50

< 1.41
< 1.00
< 0.20
< 1.00
< 0.50

< 0.50

< 0.50

0.50
< 0.50
< 4.00
< 1.00

< 1.00

< 1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for trans-1,2-Dichloroethene is 100 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.SO.b URCIS (Round 1) Data- trans-1,2-Dichloroethene Occurrence in Public Water Systems- Based on Number of Sample
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
661
131

943
3,518
8
1
13
200
1,162
127
1,002
1,301
369
524
13
10
844
3
1,565
85
2
565
297
2

1,525
590
8
356
2,633

302

412

1
992
137
145

20,447

19,945
TOTAL #
SAMPLES
1,613
351

2,957
1 1 ,746
19
62
333
279
2,462
1,220
1,909
5,340
2,224
2,311
22
26
1,786
48
2,756
327
3
1,624
644
6

3,176
1,595
148
2,172
15,607

1,211

1,272

1
3,987
654
313

70,204

67,037
#GW
SAMPLES
1,327
244

2,304
1 1 ,649
16
0
189
67
1,863
1,080
1,697
4,334
1,534
1,172
18
25
1,306
48
2,677
295
3
1,376
569
6

2,810
1,475
136
1,620
14,755

433

1,162

1
3,656
202
259

60,308

57,951
#SW
SAMPLES
286
107

653
97
3
62
144
212
599
140
212
1,006
690
1,139
4
1
480

79
32
0
248
75
0

366
120
12
552
852

778

110

0
331
452
54

9,896

9,086
% TOTAL
SAMPLES
>MRL
0.12%
0.57%

0.07%
0.77%
0.00%
0.00%
0.30%
10.75%
0.00%
0.00%
0.00%
0.37%
1 .48%
0.04%
0.00%
100.00%
0.34%
100.00%
0.15%
0.00%
100.00%
0.06%
2.33%
100.00%

0.76%
0.00%
0.00%
0.37%
0.28%

0.17%

1.10%

100.00%
0.00%
0.15%
0.96%

0.55%

0.44%
%GW
SAMPLES
>MRL
0.15%
0.41%

0.09%
0.76%
0.00%
0.00%
0.53%
28.36%
0.00%
0.00%
0.00%
0.46%
1 .56%
0.00%
0.00%
100.00%
0.31%
100.00%
0.15%
0.00%
100.00%
0.07%
2.64%
100.00%

0.82%
0.00%
0.00%
0.37%
0.29%

0.23%

1.12%

100.00%
0.00%
0.50%
0.39%

0.58%

0.45%
%SW
SAMPLES
>MRL
0.00%
0.93%

0.00%
3.09%
0.00%
0.00%
0.00%
5.19%
0.00%
0.00%
0.00%
0.00%
1 .30%
0.09%
0.00%
100.00%
0.42%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.27%
0.00%
0.00%
0.36%
0.00%

0.13%

0.91%

0.00%
0.00%
0.00%
3.70%

0.35%

0.35%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.04
< 0.50
< 0.40
< 0.00
< 0.50
< 0.00
< 0.20
< 0.06
< 0.06
< 0.50
< 0.50
0.03
< 0.10
1.00
< 0.10
< 0.20
0.70
< 0.50
< 0.50
0.20

< 0.00
< 0.00
< 0.20
< 0.06
< 0.00

< 0.01

< 0.00

0.50
< 0.50
< 0.05
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
< 0.50

< 1.00
< 1.00
< 5.00
< 0.50
< 0.50
11.10
< 0.50
< 0.30
< 1.00
< 1.00
0.21
< 1.00
< 0.50
28.00
< 0.50
80.00
< 0.20
< 2.00
2.30
< 1.00
1.40
2.50

< 1.41
< 1.00
< 0.20
< 1.00
< 0.50

< 0.50

< 0.50

0.50
< 0.50
< 4.00
< 1.00

<| 2.00

< 1.00
MAX
VALUE
(M9/L)
23.00
0.60

1.00
190.00
< 5.00
< 0.50
2.70
40.00
< 0.50
< 0.30
< 1.00
61.00
17.70
0.90
< 0.50
28.00
5.00
80.00
2.40
< 2.00
2.30
14.10
16.00
2.50

15.30
< 5.00
< 0.20
12.00
9.70

21.00

7.00

0.50
< 0.50
11.00
1.30

190.00

190.00
MIN
DETECTS
(M9/L)
0.25
0.60

1.00
0.58


2.70
0.10



0.06
0.08
0.90

0.03
0.10
1.00
0.10

0.70
14.10
0.50
0.20

0.11


0.70
0.20

2.20

0.50

0.50

11.00
0.90

0.03

0.06
MEDIAN
DETECTS
(M9/L)
11.63
0.60

1.00
2.00


2.70
1.00



1.95
0.80
0.90

0.69
0.70
4.00
1.15

0.90
14.10
1.30
0.75

1.15


1.00
1.00

11.60

0.50

0.50

11.00
1.30

1.30

1.30
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                               Occurrence of Unregulated Contaminants in Public Water Systems
Table A.SO.c URCIS (Round 1) Data- trans-1,2-Dichloroethene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,613
351

2,957
11,746
19
62
333
279
2,462
1,220
1,909
5,340
2,224
2,311
22
26
1,786
48
2,756
327
3
1,624
644
6

3,176
1,595
148
2,172
15,607

1,211

1,272

1
3,987
654
313

70,204

67,037
TOTAL
UNIQUE
PWS
661
131

943
3,518
8
1
13
200
1,162
127
1,002
1,301
369
524
13
10
844
3
1,565
85
2
565
297
2

1,525
590
8
356
2,633

302

412

1
992
137
145

20,447

19,945
#GW
PWS
532
93

873
3,488
6
0
11
36
1,053
112
963
1,187
331
291
9
9
798
3
1,540
71
2
523
254
2

1,500
555
7
253
2,475

155

392

1
937
63
116

18,641

18,267
# SW PWS
134
42

106
38
3
1
2
181
109
16
39
114
39
233
4
1
51
0
29
14
0
57
44
0

25
35
2
122
162

147

34

0
77
75
38

1,974

1,825
% PWS
>MRL
0.15%
1 .53%

0.11%
0.74%
0.00%
0.00%
7.69%
8.50%
0.00%
0.00%
0.00%
0.85%
1 .90%
0.19%
0.00%
100.00%
0.47%
100.00%
0.13%
0.00%
100.00%
0.18%
3.03%
100.00%

1.11%
0.00%
0.00%
1 .69%
0.46%

0.66%

2.43%

100.00%
0.00%
0.73%
2.07%

0.74%

0.64%
%GW
PWS
>MRL
0.19%
1 .08%

0.11%
0.72%
0.00%
0.00%
9.09%
22.22%
0.00%
0.00%
0.00%
0.93%
1.81%
0.00%
0.00%
100.00%
0.38%
100.00%
0.13%
0.00%
100.00%
0.19%
3.54%
100.00%

1 .07%
0.00%
0.00%
1 .58%
0.48%

0.65%

2.30%

100.00%
0.00%
1 .59%
0.86%

0.70%

0.59%
%SW
PWS
>MRL
0.00%
2.38%

0.00%
2.63%
0.00%
0.00%
0.00%
5.52%
0.00%
0.00%
0.00%
0.00%
2.56%
0.43%
0.00%
100.00%
1 .96%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

4.00%
0.00%
0.00%
1 .64%
0.00%

0.68%

2.94%

0.00%
0.00%
0.00%
5.26%

1.17%

1.10%
% PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.08%
0.00%
0.00%
0.00%
0.00%
0.00%
33.33%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
0.00%

0.01%

0.01%
%GW
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.08%
0.00%
0.00%
0.00%
0.00%
0.00%
33.33%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
0.00%

0.02%

0.01%
%sw
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>MCL
0.00%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.01%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
0.00%

0.01%

0.01%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy
The Maximum Contaminant Level (MCL) for trans-1,2-Dichloroethene is 100 [ig/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                 Occurrence of Unregulated Contaminants in Public Water Systems
Table A.51 .a URCIS (Round 1) Data- trans-1,3-Dichloropropene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS

1

939
3,481
5
1

204
1,162
127


235
524


124

1,565

3

297





339







992
87
145

10,231

9,883
GWPWS

1

870
3,464
3
0

35
1,053
112


216
291


82

1,540

3

254





246







937
46
116

9,269

9,017
SWPWS

0

105
17
3
1

186
109
16


20
233


44

29

0

44





109







77
41
38

1,072

959
% PWS >
MRL

100.00%

0.00%
0.20%
20.00%
0.00%

4.41%
0.00%
0.00%


0.00%
0.00%


5.65%

0.06%

100.00%

0.00%





0.00%







0.00%
0.00%
0.00%

0.28%

0.25%
%GW
PWS>
MRL

100.00%

0.00%
0.20%
0.00%
0.00%

2.86%
0.00%
0.00%


0.00%
0.00%


2.44%

0.06%

100.00%

0.00%





0.00%







0.00%
0.00%
0.00%

0.16%

0.13%
%sw
PWS>
MRL

0.00%

0.00%
0.00%
33.33%
0.00%

4.30%
0.00%
0.00%


0.00%
0.00%


1 1 .36%

0.00%

0.00%

0.00%





0.00%







0.00%
0.00%
0.00%

1.31%

1 .36%
% PWS >
MCL

















%GW
PWS>
MCL

















%SW
PWS>
MCL

















There is no Health Reference Level
(HRL), Maximum Contaminant
Level (MCL), or Health Advisory
Level (HAL) for
trans-1 ,3-Dichloropropene.




























































99%
VALUE
(M9/L)

12.40

< 5.00
< 0.50
1.00
< 0.50

1.80
< 0.50
< 0.30


< 2.00
< 1.00


0.30

< 0.20

1.10

< 0.50





< 1.00







< 0.50
< 4.00
< 0.50

< 1.00

< 1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.51.b URCIS (Round 1) Data- trans-1,3-Dichloropropene Occurrence in Public Water Systems- Based on Number of Samp
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS

1

939
3,481
5
1

204
1,162
127


235
524


124

1,565

3

297





339







992
87
145

10,231

9,883
TOTAL #
SAMPLES

2

2,906
10,484
18
62

277
2,462
1,221


1,101
2,076


327

2,757

3

644





1,772







3,987
181
313

30,593

28,738
#GW
SAMPLES

2

2,250
10,456
15
0

54
1,863
1,081


901
1,119


166

2,678

3

569





1,400







3,656
100
259

26,572

25,154
#SW
SAMPLES

0

656
28
3
62

223
599
140


200
957


161

79

0

75





372







331
81
54

4,021

3,584
% TOTAL
SAMPLES
>MRL

100.00%

0.00%
0.11%
5.56%
0.00%

3.97%
0.00%
0.00%


0.00%
0.00%


2.45%

0.04%

100.00%

0.00%





0.00%







0.00%
0.00%
0.00%

0.12%

0.12%
%GW
SAMPLES
>MRL

100.00%

0.00%
0.11%
0.00%
0.00%

3.70%
0.00%
0.00%


0.00%
0.00%


1.81%

0.04%

100.00%

0.00%





0.00%







0.00%
0.00%
0.00%

0.09%

0.08%
%sw
SAMPLES
>MRL

0.00%

0.00%
0.00%
33.33%
0.00%

4.04%
0.00%
0.00%


0.00%
0.00%


3.11%

0.00%

0.00%

0.00%





0.00%







0.00%
0.00%
0.00%

0.37%

0.39%
MIN VALUE
(M9/L)

9.10

< 0.10
< 0.00
< 0.20
< 0.50

< 0.00
< 0.50
< 0.00


< 0.07
< 0.50


< 0.10

< 0.20

0.60

< 0.50





< 0.10







< 0.50
< 0.50
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)

12.40

< 5.00
< 0.50
1.00
< 0.50

1.80
< 0.50
< 0.30


< 2.00
< 1.00


0.30

< 0.20

1.10

< 0.50





< 1.00







< 0.50
< 4.00
< 0.50

< 1.00

< 1.00
MAX
VALUE
(M9/L)

12.40

< 10.00
1.70
1.00
< 0.50

3.50
< 0.50
< 0.30


< 5.00
< 1.00


0.70

0.30

1.10

< 0.50





< 5.00







< 0.50
< 4.00
< 1.00

12.40

34.00
MIN
DETECTS
(M9/L)

9.10


0.50
1.00


0.05








0.20

0.30

0.60



















0.05

0.05
MEDIAN
DETECTS
(M9/L)

10.75


0.50
1.00


1.00








0.30

0.30

0.60



















0.60

0.55
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type)
The highlighted States are part of the URCIS 24 State Cross-Section.
  12.40
MRL= Minimum Reporting Limit

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.51 .c URCIS (Round 1) Data- trans-1,3-Dichloropropene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES

2

2,906
10,484
18
62

277
2,462
1,221


1,101
2,076


327

2,757

3

644





1,772







3,987
181
313

30,593

28,738
TOTAL
UNIQUE
PWS

1

939
3,481
5
1

204
1,162
127


235
524


124

1,565

3

297





339







992
87
145

10,231

9,883
# GW PWS

1

870
3,464
3
0

35
1,053
112


216
291


82

1,540

3

254





246







937
46
116

9,269

9,017
# SW PWS

0

105
17
3
1

186
109
16


20
233


44

29

0

44





109







77
41
38

1,072

959
% PWS
>MRL

100.00%

0.00%
0.20%
20.00%
0.00%

4.41%
0.00%
0.00%


0.00%
0.00%


5.65%

0.06%

100.00%

0.00%





0.00%







0.00%
0.00%
0.00%

0.28%

0.25%
%GW
PWS
>MRL

100.00%

0.00%
0.20%
0.00%
0.00%

2.86%
0.00%
0.00%


0.00%
0.00%


2.44%

0.06%

100.00%

0.00%





0.00%







0.00%
0.00%
0.00%

0.16%

0.13%
%sw
PWS
>MRL

0.00%

0.00%
0.00%
33.33%
0.00%

4.30%
0.00%
0.00%


0.00%
0.00%


11.36%

0.00%

0.00%

0.00%





0.00%







0.00%
0.00%
0.00%

1.31%

1.36%
% PWS
> 1/2 MCL

















%GW
PWS
> 1/2 MCL

















%sw
PWS
> 1/2 MCL

















% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level (HRL), Maximum
Contaminant Level (MCL), or Health Advisory Level (HAL) for
trans-1 ,3-Dichloropropene.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for labors
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                 Occurrence of Unregulated Contaminants in Public Water Systems
Table A.52.a URCIS (Round 1) Data-1,2,3-Trichlorobenzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
668
131

448
145
6
1
10

1,161
127

211
357
524
13

983

1,553
85


297


783
590
8
356
2,654
335
303
1
411
3

992
58
145

13,359

12,876
GWPWS
541
93

407
131
3
0
8

1,052
112

148
321
291
9

936

1,529
71


254


772
555
7
252
2,492
306
156
1
391
0

937
27
116

11,918

1 1 ,567
SWPWS
132
42

47
20
4
1
2

109
16

63
37
233
4

50

28
14


44


11
35
2
123
166
29
147
0
34
3

77
31
38

1,542

1,389
% PWS >
MRL
2.10%
13.74%

0.89%
0.00%
0.00%
0.00%
0.00%

0.00%
0.79%

0.95%
0.00%
0.00%
0.00%

0.20%

0.00%
0.00%


0.00%


0.89%
0.00%
0.00%
0.00%
0.19%
0.90%
0.00%
1
1 .46%
0.00%

0.00%
0.00%
0.69%

0.48%

0.49%
%GW
PWS>
MRL
2.03%
15.05%

0.74%
0.00%
0.00%
0.00%
0.00%

0.00%
0.89%

0.68%
0.00%
0.00%
0.00%

0.21%

0.00%
0.00%


0.00%


0.91%
0.00%
0.00%
0.00%
0.20%
0.98%
0.00%
1
1 .28%
0.00%

0.00%
0.00%
0.86%

0.45%

0.46%
%sw
PWS>
MRL
2.27%
9.52%

2.13%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

1 .59%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0
2.94%
0.00%

0.00%
0.00%
0.00%

0.65%

0.72%
% PWS >
MCL

















%GW
PWS>
MCL

















%SW
PWS>
MCL

















There is no Health Reference Level
(HRL), Maximum Contaminant
Level (MCL), or Health Advisory
Level (HAL) for
1 ,2,3-Trichlorobenzene.




























































99%
VALUE
(M9/L)
< 0.00
2.00

< 5.00
< 0.50
< 0.69
< 0.50
< 0.70

< 0.50
< 0.30

< 5.00
< 3.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00


< 0.50


< 2.00
< 1.00
< 0.20
< 1.00
< 5.00
< 0.50
< 0.50
2.00
< 10.00
< 1.00

< 0.50
< 4.00
< 1.50

< 5.00

< 5.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.52.b URCIS (Round 1) Data- 1,2,3-Trichlorobenzene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
668
131

448
145
6
1
10

1,161
127

211
357
524
13

983

1,553
85


297


783
590
8
356
2,654
335
303
1
411
3

992
58
145

13,359

12,876
TOTAL #
SAMPLES
1,764
351

1,098
1,122
12
42
53

2,464
1,221

726
1,889
2,076
22

1,748

2,655
323


644


1,605
1,595
148
2,087
15,947
444
1,220
1
1,234
10

3,987
173
313

46,974

44,276
#GW
SAMPLES
1,495
244

935
1,064
5
0
44

1,865
1,081

483
1,486
1,119
18

1,374

2,587
297


569


1,418
1,475
136
1,556
15,033
363
433
1
1,129
0

3,656
67
259

40,192

38,135
#SW
SAMPLES
269
107

163
58
7
42
9

599
140

243
403
957
4

374

68
26


75


187
120
12
531
914
81
787
0
105
10

331
106
54

6,782

6,141
% TOTAL
SAMPLES
>MRL
0.85%
6.55%

0.64%
0.00%
0.00%
0.00%
0.00%

0.00%
0.16%

0.83%
0.00%
0.00%
0.00%

0.11%

0.00%
0.00%


0.00%


0.56%
0.00%
0.00%
0.00%
0.03%
0.68%
0.00%
100.00%
0.81%
0.00%

0.00%
0.00%
0.32%

0.18%

0.19%
%GW
SAMPLES
>MRL
0.80%
7.79%

0.32%
0.00%
0.00%
0.00%
0.00%

0.00%
0.19%

1 .04%
0.00%
0.00%
0.00%

0.15%

0.00%
0.00%


0.00%


0.63%
0.00%
0.00%
0.00%
0.03%
0.83%
0.00%
100.00%
0.80%
0.00%

0.00%
0.00%
0.39%

0.18%

0.18%
%SW
SAMPLES
>MRL
1.12%
3.74%

2.45%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.41 %
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.95%
0.00%

0.00%
0.00%
0.00%

0.19%

0.21%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.00
< 0.50
< 0.30

< 0.50
< 0.00
<
< 0.06
< 0.10
< 0.50
< 0.50

< 0.20

< 0.50
< 0.20


< 0.50


< 0.00
< 0.00
< 0.20
< 0.04
< 0.20
< 0.15
< 0.03
2.00
< 0.10
< 1.00

< 0.50
< 0.50
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
2.00

< 5.00
< 0.50
< 0.69
< 0.50
< 0.70

< 0.50
< 0.30

< 5.00
< 3.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00


< 0.50


< 2.00
< 1.00
< 0.20
< 1.00
< 5.00
< 0.50
< 0.50
2.00
< 10.00
< 1.00

< 0.50
< 4.00
< 1.50

< 5.00

< 5.00
MAX
VALUE
(M9/L)
0.40
7.00

10.00
< 0.50
< 0.69
< 0.50
< 0.70

< 0.50
0.30

7.00
< 5.00
< 1.00
< 0.50

1.40

< 5.00
< 2.00


< 0.50


1.00
< 5.00
< 0.20
< 10.00
15.00
0.21
< 0.50
2.00
1.00
< 1.00

< 0.50
< 4.00
1.10

15.00

15.00
MIN
DETECTS
(M9/L)
0.2
0.50

0.05






0.30

0.06




1.00








0.04



0.50
0.15

2.00
0.50




1.10

0.04

0.04
MEDIAN
DETECTS
(M9/L)
0.3
1.00

10.00






0.30

0.06




1.20








0.33



3.00
0.15

2.00
0.50




1.10

0.50

0.50
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                             Occurrence of Unregulated Contaminants in Public Water Systems
Table A.52.C URCIS (Round 1) Data- 1,2,3-Trichlorobenzene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,764
351

1,098
1,122
12
42
53

2,464
1,221

726
1,889
2,076
22

1,748

2,655
323


644


1,605
1,595
148
2,087
15,947
444
1,220
1
1,234
10

3,987
173
313

46,974

44,276
TOTAL
UNIQUE
PWS
668
131

448
145
6
1
10

1,161
127

211
357
524
13

983

1,553
85


297


783
590
8
356
2,654
335
303
1
411
3

992
58
145

13,359

12,876
#GW
PWS
541
93

407
131
3
0
8

1,052
112

148
321
291
9

936

1,529
71


254


772
555
7
252
2,492
306
156
1
391
0

937
27
116

11,918

1 1 ,567
# SW PWS
132
42

47
20
4
1
2

109
16

63
37
233
4

50

28
14


44


11
35
2
123
166
29
147
0
34
3

77
31
38

1,542

1,389
% PWS
>MRL
2.10%
13.74%

0.89%
0.00%
0.00%
0.00%
0.00%

0.00%
0.79%

0.95%
0.00%
0.00%
0.00%

0.20%

0.00%
0.00%


0.00%


0.89%
0.00%
0.00%
0.00%
0.19%
0.90%
0.00%
100.00%
1 .46%
0.00%

0.00%
0.00%
0.69%

0.48%

0.49%
%GW
PWS
>MRL
2.03%
15.05%

0.74%
0.00%
0.00%
0.00%
0.00%

0.00%
0.89%

0.68%
0.00%
0.00%
0.00%

0.21%

0.00%
0.00%


0.00%


0.91 %
0.00%
0.00%
0.00%
0.20%
0.98%
0.00%
100.00%
1 .28%
0.00%

0.00%
0.00%
0.86%

0.45%

0.46%
%SW
PWS
>MRL
2.27%
9.52%

2.13%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

1 .59%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.94%
0.00%

0.00%
0.00%
0.00%

0.65%

0.72%
% PWS
> 1/2 MCL

















%GW
PWS
> 1/2 MCL

















%SW
PWS
> 1/2 MCL

















% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level (HRL), Maximum Contaminant
Level (MCL), or Health Advisory Level (HAL) for 1 ,2,3-
Trichloro benzene.
















































































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for labor;
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.53.a URCIS (Round 1) Data-1,2,4-Trichlorobenzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
668
131

447
616
6
1
10
149
1,163
127

403
355
524
13

825

1,553
85
1

297


809
590
8
354
2,554
335
303
1
405
3

992
58
145

13,931

13,449
GWPWS
542
93

406
599
3
0
8
22
1,054
112

316
320
291
9

778

1,529
71
1

254


798
555
7
251
2,400
306
156
1
385
0

937
27
116

12,347

1 1 ,996
SWPWS
131
42

47
23
4
1
2
134
109
16

87
36
233
4

50

28
14
0

44


11
35
2
122
157
29
147
0
34
3

77
31
38

1,691

1,539
% PWS >
MRL
2.84%
8.40%

0.89%
0.32%
0.00%
0.00%
0.00%
4.03%
0.00%
0.00%

0.74%
0.00%
0.00%
0.00%

0.48%

0.00%
0.00%
100.00%

0.00%


0.37%
0.00%
12.50%
0.00%
0.16%
0.90%
0.00%
100.00%
1 .23%
0.00%

0.10%
0.00%
0.69%

0.50%

0.49%
%GW
PWS>
MRL
2.95%
1 1 .83%

0.74%
0.33%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.63%
0.00%
0.00%
0.00%

0.51 %

0.00%
0.00%
100.00%

0.00%


0.38%
0.00%
14.29%
0.00%
0.17%
0.98%
0.00%
100.00%
1 .04%
0.00%

0.11%
0.00%
0.86%

0.46%

0.45%
%sw
PWS>
MRL
2.29%
0.00%

2.13%
0.00%
0.00%
0.00%
0.00%
4.48%
0.00%
0.00%

1.15%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.94%
0.00%

0.00%
0.00%
0.00%

0.71 %

0.78%
% PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
99%
VALUE
(M9/L)
0.20
2.00

< 2.00
< 5.00
< 0.81
< 0.50
< 1.40
5.00
< 0.50
< 0.30

< 5.00
< 3.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00
0.80

< 0.50


< 2.00
< 1.00
< 0.20
< 1.00
< 5.00
< 0.50
< 0.50
2.00
< 10.00
< 1.00

< 0.50
< 4.00
< 1.00

< 5.00

< 5.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for 1,2,4-Trichlorobenzene is 70 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.53.b URCIS (Round 1) Data- 1,2,4-Trichlorobenzene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
668
131

447
616
6
1
10
149
1,163
127

403
355
524
13

825

1,553
85
1

297


809
590
8
354
2,554
335
303
1
405
3

992
58
145

13,931

13,449
TOTAL #
SAMPLES
1,770
351

1,103
2,205
11
42
53
187
2,464
1,221

3,131
1,874
2,075
22

1,571

2,655
322
1

644


1,641
1,595
148
2,032
14,688
444
1,220
1
1,190
10

3,987
173
313

49,144

46,502
#GW
SAMPLES
1,502
244

940
2,142
5
0
44
34
1,865
1,081

2,453
1,479
1,119
18

1,198

2,587
296
1

569


1,454
1,475
136
1,508
13,947
363
433
1
1,086
0

3,656
67
259

41 ,962

39,953
#SW
SAMPLES
268
107

163
63
6
42
9
153
599
140

678
395
956
4

373

68
26
0

75


187
120
12
524
741
81
787
0
104
10

331
106
54

7,182

6,549
% TOTAL
SAMPLES
>MRL
1.13%
3.70%

0.63%
0.23%
0.00%
0.00%
0.00%
3.21%
0.00%
0.00%

0.10%
0.00%
0.00%
0.00%

0.32%

0.00%
0.00%
100.00%

0.00%


0.18%
0.00%
0.68%
0.00%
0.03%
0.68%
0.00%
100.00%
0.76%
0.00%

0.03%
0.00%
0.32%

0.17%

0.17%
%GW
SAMPLES
>MRL
1.13%
5.33%

0.32%
0.23%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.08%
0.00%
0.00%
0.00%

0.42%

0.00%
0.00%
100.00%

0.00%


0.21%
0.00%
0.74%
0.00%
0.03%
0.83%
0.00%
100.00%
0.74%
0.00%

0.03%
0.00%
0.39%

0.16%

0.16%
%SW
SAMPLES
>MRL
1.12%
0.00%

2.45%
0.00%
0.00%
0.00%
0.00%
3.92%
0.00%
0.00%

0.15%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.96%
0.00%

0.00%
0.00%
0.00%

0.21%

0.23%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.00
< 0.50
< 0.30
< 0.00
< 0.50
< 0.00

< 0.03
< 0.10
< 0.50
< 0.50

< 0.20

< 0.50
< 0.20
0.80

< 0.50


< 0.00
< 0.00
< 0.20
< 0.03
< 0.00
< 0.15
< 0.03
2.00
< 0.10
< 1.00

< 0.50
< 0.50
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
0.20
2.00

< 2.00
< 5.00
< 0.81
< 0.50
< 1.40
5.00
< 0.50
< 0.30

< 5.00
< 3.00
< 1.00
< 0.50

< 0.50

< 0.50
< 2.00
0.80

< 0.50


< 2.00
< 1.00
< 0.20
< 1.00
< 5.00
< 0.50
< 0.50
2.00
< 10.00
< 1.00

< 0.50
< 4.00
< 1.00

< 5.00

< 5.00
MAX
VALUE
(M9/L)
0.30
5.00

10.00
21.00
< 0.81
< 0.50
< 1.40
10.00
< 0.50
< 0.30

3.00
< 5.00
< 1.00
< 0.50

3.70

< 5.00
< 2.00
0.80

< 0.50


0.50
< 5.00
0.40
< 10.00
3.00
0.76
< 0.50
2.00
0.10
< 1.00

16.00
< 4.00
0.80

21.00

21.00
MIN
DETECTS
(M9/L)
0.16
0.60

0.05
1.30



0.10



0.04




0.80



0.80




0.02

0.40

0.50
0.15

2.00
0.10


16.00

0.80

0.02

0.02
MEDIAN
DETECTS
(M9/L)
0.20
0.90

10.00
13.00



5.00



0.70




2.00



0.80




0.15

0.40

3.00
0.23

2.00
0.10


16.00

0.80

0.60

0.60
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.53.C URCIS (Round 1) Data-1,2,4-Trichlorobenzene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,770
351

1,103
2,205
11
42
53
187
2,464
1,221

3,131
1,874
2,075
22

1,571

2,655
322
1

644


1,641
1,595
148
2,032
14,688
444
1,220
1
1,190
10

3,987
173
313

49,144

46,502
TOTAL
UNIQUE
PWS
668
131

447
616
6
1
10
149
1,163
127

403
355
524
13

825

1,553
85
1

297


809
590
8
354
2,554
335
303
1
405
3

992
58
145

13,931

13,449
#GW
PWS
542
93

406
599
3
0
8
22
1,054
112

316
320
291
9

778

1,529
71
1

254


798
555
7
251
2,400
306
156
1
385
0

937
27
116

12,347

11,996
#SW
PWS
131
42

47
23
4
1
2
134
109
16

87
36
233
4

50

28
14
0

44


11
35
2
122
157
29
147
0
34
3

77
31
38

1,691

1,539
% PWS
>MRL
2.84%
8.40%

0.89%
0.32%
0.00%
0.00%
0.00%
4.03%
0.00%
0.00%

0.74%
0.00%
0.00%
0.00%

0.48%

0.00%
0.00%
100.00%

0.00%


0.37%
0.00%
12.50%
0.00%
0.16%
0.90%
0.00%
100.00%
1.23%
0.00%

0.10%
0.00%
0.69%

0.50%

0.49%
%GW
PWS
>MRL
2.95%
11.83%

0.74%
0.33%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.63%
0.00%
0.00%
0.00%

0.51 %

0.00%
0.00%
100.00%

0.00%


0.38%
0.00%
14.29%
0.00%
0.17%
0.98%
0.00%
100.00%
1 .04%
0.00%

0.11%
0.00%
0.86%

0.46%

0.45%
%sw
PWS
>MRL
2.29%
0.00%

2.13%
0.00%
0.00%
0.00%
0.00%
4.48%
0.00%
0.00%

1.15%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.94%
0.00%

0.00%
0.00%
0.00%

0.71%

0.78%
% PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the

The Maximum Contaminant Level (MCL) for 1,2,4-Trichlorobenzene is 70 ug/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.54.a URCIS (Round 1) Data-1,1,1-Trichloroethane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
685
132

961
3,559
18
1
13

1,161
19


395
525
13
77
844
23
1,561
85
11

297
30

1,242
590
10
355
1,687


5
417
3

992
68
144

15,923

15,279
GWPWS
553
94

888
3,529
14
0
11

1,052
15


350
291
9
65
798
21
1,536
71
10

254
30

1,239
555
8
252
1,557


3
395
0

937
32
116

14,685

14,191
SWPWS
138
42

115
43
5
1
2

109
4


46
234
4
20
51
2
29
14
1

44
0

3
35
4
122
134


2
36
3

77
36
37

1,393

1,213
% PWS >
MRL
3.94%
10.61%

0.31 %
3.79%
50.00%
100.00%
23.08%

0.52%
5.26%


5.57%
4.38%
0.00%
83.12%
5.33%
100.00%
4.16%
1.18%
100.00%

15.49%
100.00%

7.57%
0.34%
10.00%
6.20%
2.07%


100.00%
2.64%
0.00%

2.02%
5.88%
4.17%

4.58%

3.66%
%GW
PWS>
MRL
3.62%
1 1 .70%

0.34%
3.77%
50.00%
0.00%
27.27%

0.48%
6.67%


5.14%
3.44%
0.00%
89.23%
4.51 %
100.00%
3.97%
1 .41 %
100.00%

16.93%
100.00%

7.59%
0.36%
12.50%
8.73%
1 .99%


100.00%
2.53%
0.00%

2.03%
12.50%
4.31 %

4.51 %

3.57%
%SW
PWS>
MRL
5.07%
7.14%

0.00%
9.30%
40.00%
100.00%
0.00%

0.92%
0.00%


10.87%
5.56%
0.00%
65.00%
17.65%
100.00%
13.79%
0.00%
100.00%

6.82%
0.00%

0.00%
0.00%
0.00%
0.82%
2.99%


100.00%
2.78%
0.00%

1 .30%
0.00%
2.70%

5.60%

4.62%
% PWS
>MCL
0.00%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%

0.00%
0.00%


0.25%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
3.33%

0.08%
0.00%
0.00%
0.28%
0.06%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.04%

0.03%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%

0.00%
0.00%


0.29%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
3.33%

0.08%
0.00%
0.00%
0.40%
0.06%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.04%

0.03%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
99%
VALUE
(M9/L)
10.50
6.80

< 5.00
4.80
21.41
2.40
8.00

< 0.50
1.00


16.44
1.50
< 0.50
53.00
3.10
145.00
0.60
1.20
2.90

13.00
342.70

7.10
< 1.00
< 0.20
8.00
2.00


90.00
0.10
< 0.50

1.50
4.00
0.40

6.10

5.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for 1,1,1-Trichloroethane is 200 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.54.b URCIS (Round 1) Data- 1,1,1-Trichloroethane Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
685
132

961
3,559
18
1
13

1,161
19


395
525
13
77
844
23
1,561
85
11

297
30

1,242
590
10
355
1,687


5
417
3

992
68
144

15,923

15,279
TOTAL #
SAMPLES
1,787
356

3,083
13,317
143
66
333

2,461
61


2,697
3,688
22
351
1,786
189
2,741
325
30

644
65

1,775
1,595
191
2,149
6,369


6
1,290
10

3,987
452
310

52,279

48,399
#GW
SAMPLES
1,484
249

2,373
13,180
138
0
189

1,863
34


1,854
1,406
18
312
1,306
182
2,662
293
29

569
65

1,766
1,475
155
1,604
5,755


4
1,175
0

3,656
120
259

44,175

41,186
#SW
SAMPLES
303
107

710
137
5
66
144

598
27


843
2,282
4
39
480
7
79
32
1

75
0

9
120
36
545
614


2
115
10

331
332
51

8,104

7,213
% TOTAL
SAMPLES
>MRL
4.03%
5.34%

0.65%
10.11%
74.83%
3.03%
6.31 %

0.49%
3.28%


9.90%
1 .52%
0.00%
89.46%
4.82%
100.00%
3.14%
2.15%
100.00%

13.04%
100.00%

10.87%
0.13%
0.52%
5.91%
2.21%


100.00%
1 .47%
0.00%

3.06%
1 .77%
2.26%

6.53%

5.25%
%GW
SAMPLES
>MRL
4.38%
6.43%

0.84%
10.19%
76.09%
0.00%
11.11%

0.43%
5.88%


10.63%
2.63%
0.00%
91 .35%
5.28%
100.00%
3.04%
2.39%
100.00%

14.24%
100.00%

10.93%
0.14%
0.65%
7.79%
2.38%


100.00%
1 .53%
0.00%

3.25%
6.67%
2.32%

7.30%

5.83%
%SW
SAMPLES
>MRL
2.31%
2.80%

0.00%
2.92%
40.00%
3.03%
0.00%

0.67%
0.00%


8.30%
0.83%
0.00%
74.36%
3.54%
100.00%
6.33%
0.00%
100.00%

4.00%
0.00%

0.00%
0.00%
0.00%
0.37%
0.65%


100.00%
0.87%
0.00%

0.91%
0.00%
1 .96%

2.30%

1 .95%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.00
< 0.50
< 0.00

< 0.50
< 0.30
<
<
< 0.10
< 0.06
< 0.50
< 0.00
< 0.10
1.00
< 0.10
< 0.20
0.50

< 0.41
0.20

< 0.00
< 0.00
< 0.05
< 0.08
< 0.00


1.00
< 0.10
< 0.50

< 0.50
< 0.05
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
10.50
6.80

< 5.00
4.80
21.41
2.40
8.00

< 0.50
1.00


16.44
1.50
< 0.50
53.00
3.10
145.00
0.60
1.20
2.90

13.00
342.70

7.10
< 1.00
< 0.20
8.00
2.00


90.00
0.10
< 0.50

1.50
4.00
0.40

6.00

3.71
MAX
VALUE
(M9/L)
150.00
18.00

9.00
202.20
22.60
2.40
13.20

15.10
1.00


330.00
49.00
< 0.50
140.00
12.00
150.00
13.00
1.70
2.90

25.80
342.70

290.00
3.70
0.20
213.00
281 .00


90.00
4.00
< 0.50

4.20
10.00
16.00

342.70

330.00
MIN
DETECTS
(M9/L)
0.20
0.50

0.40
0.20
0.06
1.20
0.20

0.80
1.00


0.15
1.00

0.06
0.20
1.00
0.10
0.40
0.50

0.41
0.20

0.04
1.80
0.20
0.40
0.31


1.00
0.10


0.50
0.50
0.20

0.04

0.04
MEDIAN
DETECTS
(M9/L)
5.40
2.10

2.00
1.00
2.70
1.80
1.40

2.80
1.00


1.12
2.20

1.30
1.00
9.00
0.40
1.20
0.85

2.10
1.10

0.83
2.75
0.20
1.50
1.60


1.80
0.70


1.10
4.00
0.40

1.20

1.10
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.54.C URCIS (Round 1) Data-1,1,1-Trichloroethane Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,787
356

3,083
13,317
143
66
333

2,461
61


2,697
3,688
22
351
1,786
189
2,741
325
30

644
65

1,775
1,595
191
2,149
6,369


6
1,290
10

3,987
452
310

52,279

48,399
TOTAL
UNIQUE
PWS
685
132

961
3,559
18
1
13

1,161
19


395
525
13
77
844
23
1,561
85
11

297
30

1,242
590
10
355
1,687


5
417
3

992
68
144

15,923

15,279
#GW
PWS
553
94

888
3,529
14
0
11

1,052
15


350
291
9
65
798
21
1,536
71
10

254
30

1,239
555
8
252
1,557


3
395
0

937
32
116

14,685

14,191
#SW
PWS
138
42

115
43
5
1
2

109
4


46
234
4
20
51
2
29
14
1

44
0

3
35
4
122
134


2
36
3

77
36
37

1,393

1,213
% PWS
>MRL
3.94%
10.61%

0.31%
3.79%
50.00%
100.00%
23.08%

0.52%
5.26%


5.57%
4.38%
0.00%
83.12%
5.33%
100.00%
4.16%
1.18%
100.00%

15.49%
100.00%

7.57%
0.34%
10.00%
6.20%
2.07%


100.00%
2.64%
0.00%

2.02%
5.88%
4.17%

4.58%

3.66%
%GW
PWS
>MRL
3.62%
11.70%

0.34%
3.77%
50.00%
0.00%
27.27%

0.48%
6.67%


5.14%
3.44%
0.00%
89.23%
4.51 %
100.00%
3.97%
1 .41 %
100.00%

16.93%
100.00%

7.59%
0.36%
12.50%
8.73%
1 .99%


100.00%
2.53%
0.00%

2.03%
12.50%
4.31 %

4.51 %

3.57%
%SW
PWS
>MRL
5.07%
7.14%

0.00%
9.30%
40.00%
100.00%
0.00%

0.92%
0.00%


10.87%
5.56%
0.00%
65.00%
17.65%
100.00%
13.79%
0.00%
100.00%

6.82%
0.00%

0.00%
0.00%
0.00%
0.82%
2.99%


100.00%
2.78%
0.00%

1.30%
0.00%
2.70%

5.60%

4.62%
% PWS
> 1/2 MCL
0.29%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%

0.00%
0.00%


0.25%
0.00%
0.00%
1 .30%
0.00%
13.04%
0.00%
0.00%
0.00%

0.00%
3.33%

0.08%
0.00%
0.00%
0.28%
0.18%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.09%

0.05%
%GW
PWS
> 1/2 MCL
0.36%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%

0.00%
0.00%


0.29%
0.00%
0.00%
0.00%
0.00%
14.29%
0.00%
0.00%
0.00%

0.00%
3.33%

0.08%
0.00%
0.00%
0.40%
0.19%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.09%

0.06%
%sw
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
5.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.07%

0.00%
% PWS
>MCL
0.00%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%

0.00%
0.00%


0.25%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
3.33%

0.08%
0.00%
0.00%
0.28%
0.06%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.04%

0.03%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%

0.00%
0.00%


0.29%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
3.33%

0.08%
0.00%
0.00%
0.40%
0.06%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.04%

0.03%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the

The Maximum Contaminant Level (MCL) for 1,1,1-Trichloroethane is 200 ug/L
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.55.a URCIS (Round 1) Data-1,1,2-Trichloroethane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
659
131

943
3,521
10
1
13
224
1,162
127
1,002
1,299
365
524
13
2
828

1,564
85
1
565
297


1,511
590
8
355
2,656
335
303

84
3
1
992
137
145

20,456

19,964
GWPWS
531
93

873
3,492
7
0
11
42
1,053
112
963
1,185
327
291
9
1
782

1,539
71
1
523
254


1,486
555
7
252
2,493
306
156

81
0
1
937
63
116

18,613

18,253
SWPWS
133
42

106
39
4
1
2
204
109
16
39
114
39
233
4
1
51

29
14
0
57
44


25
35
2
122
167
29
147

5
3

77
75
38

2,006

1,853
% PWS >
MRL
0.00%
10.69%

0.00%
0.62%
10.00%
0.00%
7.69%
4.91 %
0.09%
0.00%
0.00%
0.46%
0.00%
0.19%
0.00%
100.00%
0.36%

0.58%
0.00%
100.00%
0.18%
0.67%


0.26%
0.00%
0.00%
0.85%
0.04%
0.30%
0.99%

0.00%
0.00%
100.00%
0.40%
0.00%
1 .38%

0.46%

0.43%
%GW
PWS>
MRL
0.00%
2.15%

0.00%
0.63%
0.00%
0.00%
9.09%
7.14%
0.09%
0.00%
0.00%
0.42%
0.00%
0.34%
0.00%
100.00%
0.13%

0.52%
0.00%
100.00%
0.00%
0.39%


0.27%
0.00%
0.00%
0.79%
0.04%
0.33%
0.00%

0.00%
0.00%
100.00%
0.32%
0.00%
0.00%

0.32%

0.29%
%sw
PWS>
MRL
0.00%
28.57%

0.00%
0.00%
25.00%
0.00%
0.00%
3.92%
0.00%
0.00%
0.00%
0.88%
0.00%
0.00%
0.00%
100.00%
3.92%

6.90%
0.00%
0.00%
1 .75%
2.27%


0.00%
0.00%
0.00%
0.82%
0.00%
0.00%
2.04%

0.00%
0.00%
0.00%
1 .30%
0.00%
5.26%

1 .79%

1 .78%
% PWS
>MCL
0.00%
0.76%

0.00%
0.09%
0.00%
0.00%
7.69%
0.45%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.12%

0.00%
0.00%
0.00%
0.18%
0.00%


0.00%
0.00%
0.00%
0.28%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.04%

0.04%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.09%
0.00%
0.00%
9.09%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.13%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.03%

0.02%
%sw
PWS
>MCL
0.00%
2.38%

0.00%
0.00%
0.00%
0.00%
0.00%
0.49%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
1 .75%
0.00%


0.00%
0.00%
0.00%
0.82%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.20%

0.16%
99%
VALUE
(M9/L)
< 0.00
1.81

< 1.00
< 1.00
< 0.47
< 0.50
< 0.50
1.10
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50
0.90
< 0.50

< 0.20
< 2.00
2.60
< 1.00
< 0.50


< 1.00
< 1.00
< 0.20
< 1.00
< 0.50
< 0.50
< 0.50

< 10.00
< 1.00
0.60
< 0.50
< 4.00
< 1.00

< 1.00

< 1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for 1,1,2-Trichloroethene is 5 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.55.b URCIS (Round 1) Data- 1,1,2-Trichloroethane Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
659
131

943
3,521
10
1
13
224
1,162
127
1,002
1,299
365
524
13
2
828

1,564
85
1
565
297


1,511
590
8
355
2,656
335
303

84
3
1
992
137
145

20,456

19,964
TOTAL #
SAMPLES
1,606
351

2,930
11,719
34
62
333
323
2,461
1,221
1,908
5,270
1,933
2,076
22
2
1,730

2,753
324
2
1,624
644


3,130
1,595
148
2,161
16,084
444
1,220

152
10
1
3,987
390
313

68,963

65,864
#GW
SAMPLES
1,321
244

2,271
11,617
30
0
189
69
1,863
1,081
1,697
4,268
1,512
1,119
18
1
1,263

2,674
297
2
1,376
569


2,775
1,475
136
1,617
15,165
363
433

139
0
1
3,656
164
259

59,664

57,373
#SW
SAMPLES
285
107

659
102
4
62
144
254
598
140
211
1,002
421
957
4
1
467

79
27
0
248
75


355
120
12
544
919
81
787

13
10
0
331
226
54

9,299

8,491
% TOTAL
SAMPLES
>MRL
0.00%
12.54%

0.00%
0.32%
2.94%
0.00%
0.30%
3.72%
0.08%
0.00%
0.00%
0.17%
0.00%
0.05%
0.00%
100.00%
0.17%

0.44%
0.00%
100.00%
0.12%
0.31 %


0.16%
0.00%
0.00%
0.28%
0.01%
0.23%
0.33%

0.00%
0.00%
100.00%
0.18%
0.00%
0.64%

0.23%

0.22%
%GW
SAMPLES
>MRL
0.00%
0.82%

0.00%
0.33%
0.00%
0.00%
0.53%
5.80%
0.11%
0.00%
0.00%
0.19%
0.00%
0.09%
0.00%
100.00%
0.08%

0.37%
0.00%
100.00%
0.00%
0.18%


0.18%
0.00%
0.00%
0.31%
0.01%
0.28%
0.00%

0.00%
0.00%
100.00%
0.16%
0.00%
0.00%

0.15%

0.14%
%SW
SAMPLES
>MRL
0.00%
39.25%

0.00%
0.00%
25.00%
0.00%
0.00%
3.15%
0.00%
0.00%
0.00%
0.10%
0.00%
0.00%
0.00%
100.00%
0.43%

2.53%
0.00%
0.00%
0.81%
1 .33%


0.00%
0.00%
0.00%
0.18%
0.00%
0.00%
0.51 %

0.00%
0.00%
0.00%
0.30%
0.00%
3.70%

0.73%

0.77%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.10
< 0.50
< 0.20
< 0.00
< 0.50
< 0.00
< 0.20
< 0.01
< 0.04
< 0.50
< 0.50
0.60
< 0.10

< 0.20
< 0.20
2.40
< 0.50
< 0.50


< 0.00
< 0.00
< 0.20
< 0.10
< 0.20
< 0.16
< 0.01

< 0.10
< 1.00
0.60
< 0.50
< 0.05
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
1.81

< 1.00
< 1.00
< 0.47
< 0.50
< 0.50
1.10
< 0.50
< 0.30
< 1.00
< 1.00
< 2.00
< 1.00
< 0.50
0.90
< 0.50

< 0.20
< 2.00
2.60
< 1.00
< 0.50


< 1.00
< 1.00
< 0.20
< 1.00
< 0.50
< 0.50
< 0.50

< 10.00
< 1.00
0.60
< 0.50
< 4.00
< 1.00

< 1.00

< 1.00
MAX
VALUE
(M9/L)
< 0.00
6.36

< 15.00
9.00
0.47
< 0.50
23.40
46.00
2.40
< 0.30
< 1.00
0.78
< 5.00
2.00
< 0.50
0.90
11.50

3.30
< 2.00
2.60
11.00
1.50


2.10
< 5.00
< 0.20
14.00
1.00
0.16
1.20

< 10.00
< 1.00
0.60
1.80
< 4.00
2.50

46.00

46.00
MIN
DETECTS
(M9/L)

0.51


0.20
0.47

23.40
0.02
1.60


0.12

2.00

0.60
0.70

0.20

2.40
5.44
0.50


0.60


0.90
1.00
0.16
0.50



0.60
0.50

1.80

0.02

0.02
MEDIAN
DETECTS
(M9/L)

0.98


1.20
0.47

23.40
1.00
2.00


0.50

2.00

0.75
0.70

0.30

2.50
8.22
1.00


1.18


1.75
1.00
0.16
0.90



0.60
0.60

2.15

1.00

0.99
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.55.C URCIS (Round 1) Data-1,1,2-Trichloroethane Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,606
351

2,930
11,719
34
62
333
323
2,461
1,221
1,908
5,270
1,933
2,076
22
2
1,730

2,753
324
2
1,624
644


3,130
1,595
148
2,161
16,084
444
1,220

152
10
1
3,987
390
313

68,963

65,864
TOTAL
UNIQUE
PWS
659
131

943
3,521
10
1
13
224
1,162
127
1,002
1,299
365
524
13
2
828

1,564
85
1
565
297


1,511
590
8
355
2,656
335
303

84
3
1
992
137
145

20,456

19,964
#GW
PWS
531
93

873
3,492
7
0
11
42
1,053
112
963
1,185
327
291
9
1
782

1,539
71
1
523
254


1,486
555
7
252
2,493
306
156

81
0
1
937
63
116

18,613

18,253
#SW
PWS
133
42

106
39
4
1
2
204
109
16
39
114
39
233
4
1
51

29
14
0
57
44


25
35
2
122
167
29
147

5
3
0
77
75
38

2,006

1,853
% PWS
>MRL
0.00%
10.69%

0.00%
0.62%
10.00%
0.00%
7.69%
4.91%
0.09%
0.00%
0.00%
0.46%
0.00%
0.19%
0.00%
100.00%
0.36%

0.58%
0.00%
100.00%
0.18%
0.67%


0.26%
0.00%
0.00%
0.85%
0.04%
0.30%
0.99%

0.00%
0.00%
100.00%
0.40%
0.00%
1.38%

0.46%

0.43%
%GW
PWS
>MRL
0.00%
2.15%

0.00%
0.63%
0.00%
0.00%
9.09%
7.14%
0.09%
0.00%
0.00%
0.42%
0.00%
0.34%
0.00%
100.00%
0.13%

0.52%
0.00%
100.00%
0.00%
0.39%


0.27%
0.00%
0.00%
0.79%
0.04%
0.33%
0.00%

0.00%
0.00%
100.00%
0.32%
0.00%
0.00%

0.32%

0.29%
%sw
PWS
>MRL
0.00%
28.57%

0.00%
0.00%
25.00%
0.00%
0.00%
3.92%
0.00%
0.00%
0.00%
0.88%
0.00%
0.00%
0.00%
100.00%
3.92%

6.90%
0.00%
0.00%
1.75%
2.27%


0.00%
0.00%
0.00%
0.82%
0.00%
0.00%
2.04%

0.00%
0.00%
0.00%
1.30%
0.00%
5.26%

1.79%

1.78%
% PWS
> 1/2 MCL
0.00%
1 .53%

0.00%
0.20%
0.00%
0.00%
7.69%
0.89%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.12%

0.06%
0.00%
100.00%
0.18%
0.00%


0.00%
0.00%
0.00%
0.56%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.09%

0.07%
%GW
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.20%
0.00%
0.00%
9.09%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.13%

0.06%
0.00%
100.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.40%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.06%

0.05%
%sw
PWS
> 1/2 MCL
0.00%
4.76%

0.00%
0.00%
0.00%
0.00%
0.00%
0.98%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
1 .75%
0.00%


0.00%
0.00%
0.00%
0.82%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.30%

0.27%
% PWS
>MCL
0.00%
0.76%

0.00%
0.09%
0.00%
0.00%
7.69%
0.45%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.12%

0.00%
0.00%
0.00%
0.18%
0.00%


0.00%
0.00%
0.00%
0.28%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.04%

0.04%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.09%
0.00%
0.00%
9.09%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.13%

0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.03%

0.02%
%sw
PWS
>MCL
0.00%
2.38%

0.00%
0.00%
0.00%
0.00%
0.00%
0.49%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
1.75%
0.00%


0.00%
0.00%
0.00%
0.82%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.20%

0.16%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the
The Maximum Contaminant Level (MCL) for 1,1,2-Trichloroethene is 5 ug/L
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.56.a URCIS (Round 1) Data- Trichloroethylene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
709
134

968
3,532
15
1
13

1,161
19


398
525
13
65
844
29
1,564
85
4

297
25

1,241
590
10
356
1,687


9
416
3

992
69
144

15,918

15,290
GWPWS
576
96

893
3,503
12
0
11

1,052
15


352
291
9
58
798
26
1,539
71
4

254
25

1,238
555
8
252
1,557


8
394
0

937
32
116

14,682

14,198
SWPWS
139
42

119
43
5
1
2

109
4


47
234
4
14
51
3
29
14
0

44
0

3
35
4
123
134


1
36
3

77
37
37

1,394

1,220
% PWS >
MRL
2.12%
12.69%

1 .03%
5.12%
46.67%
0.00%
30.77%

0.95%
0.00%


6.03%
7.62%
7.69%
70.77%
3.08%
100.00%
3.26%
4.71%
100.00%

14.14%
100.00%

5.00%
0.51%
10.00%
7.30%
1 .90%


100.00%
1 .44%
0.00%

1.51%
4.35%
2.78%

4.38%

3.54%
%GW
PWS>
MRL
2.43%
14.58%

0.90%
5.14%
50.00%
0.00%
36.36%

0.95%
0.00%


5.40%
1 .72%
11.11%
70.69%
2.13%
100.00%
3.25%
5.63%
100.00%

15.35%
100.00%

5.01%
0.54%
12.50%
8.33%
2.06%


100.00%
1 .27%
0.00%

1 .60%
9.38%
1 .72%

4.22%

3.37%
%SW
PWS>
MRL
0.72%
9.52%

2.52%
9.30%
40.00%
0.00%
0.00%

0.92%
0.00%


10.64%
14.96%
0.00%
85.71%
17.65%
100.00%
3.45%
0.00%
0.00%

6.82%
0.00%

0.00%
0.00%
0.00%
4.88%
0.00%


100.00%
2.78%
0.00%

0.00%
0.00%
5.41%

6.67%

5.66%
% PWS
>MCL
0.42%
2.99%

0.62%
2.18%
6.67%
0.00%
15.38%

0.52%
0.00%


2.76%
0.76%
7.69%
32.31%
0.12%
58.62%
0.13%
0.00%
25.00%

2.36%
16.00%

1.21%
0.00%
0.00%
1 .97%
0.65%


11.11%
0.00%
0.00%

0.20%
1 .45%
0.00%

1 .29%

0.98%
%GW
PWS
>MCL
0.52%
3.13%

0.45%
2.17%
8.33%
0.00%
18.18%

0.57%
0.00%


2.56%
0.69%
11.11%
29.31%
0.13%
57.69%
0.13%
0.00%
25.00%

2.76%
16.00%

1.21%
0.00%
0.00%
2.38%
0.71%


12.50%
0.00%
0.00%

0.21%
3.13%
0.00%

1 .29%

1 .00%
%sw
PWS
>MCL
0.00%
2.38%

1 .68%
2.33%
0.00%
0.00%
0.00%

0.00%
0.00%


4.26%
0.85%
0.00%
50.00%
0.00%
66.67%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.81%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

1 .29%

0.66%
99% VALUE
(M9/L)
0.20
14.10

< 1.00
42.00
39.00
< 1.00
6.20

< 0.50
< 0.30


17.56
1.00
3668.90
58.00
0.80
124.00
0.60
0.60
616.50

13.70
65.10

20.10
< 1.00
1.80
7.20
5.47


6.00
< 2.00
< 0.50

2.00
< 4.00
0.20

25.00

20.75
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation.  An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Trichloroethylene is 5 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.56.b URCIS (Round 1) Data- Trichloroethylene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
709
134

968
3,532
15
1
13

1,161
19


398
525
13
65
844
29
1,564
85
4

297
25

1,241
590
10
356
1,687


9
416
3

992
69
144

15,918

15,290
TOTAL #
SAMPLES
2,027
365

3,079
18,304
170
66
336

2,463
60


2,741
3,686
22
316
1,785
514
2,750
327
69

644
139

1,772
1,595
191
2,541
6,366


12
1,278
10

3,987
462
310

58,387

53,674
#GW
SAMPLES
1,714
256

2,363
18,134
165
0
191

1,864
33


1,897
1,406
18
274
1,305
371
2,673
295
69

569
139

1,763
1,475
155
1,863
5,751


10
1,165
0

3,656
129
259

49,962

46,412
#SW
SAMPLES
313
109

716
170
5
66
145

599
27


844
2,280
4
42
480
143
77
32
0

75
0

9
120
36
678
615


2
113
10

331
333
51

8,425

7,262
% TOTAL
SAMPLES
>MRL
1 .09%
17.26%

0.58%
33.37%
82.35%
0.00%
7.74%

0.89%
0.00%


11.93%
1.95%
22.73%
85.44%
2.46%
100.00%
3.13%
1 .53%
100.00%

17.86%
100.00%

9.59%
0.69%
1 .57%
6.06%
3.80%


100.00%
0.78%
0.00%

2.21%
0.87%
1 .29%

14.97%

13.80%
%GW
SAMPLES
>MRL
1.17%
22.27%

0.51 %
33.47%
83.64%
0.00%
13.61%

1.13%
0.00%


14.02%
1 .49%
27.78%
85.04%
1 .99%
100.00%
3.18%
1 .69%
100.00%

19.51%
100.00%

9.64%
0.75%
1 .94%
7.94%
4.21%


100.00%
0.77%
0.00%

2.41%
3.10%
0.77%

16.73%

15.54%
%SW
SAMPLES
>MRL
0.64%
5.50%

0.84%
22.94%
40.00%
0.00%
0.00%

0.17%
0.00%


7.23%
2.24%
0.00%
88.10%
3.75%
100.00%
1 .30%
0.00%
0.00%

5.33%
0.00%

0.00%
0.00%
0.00%
0.88%
0.00%


100.00%
0.88%
0.00%

0.00%
0.00%
3.92%

4.53%

2.64%
MIN VALUE
(M9/L)
< 0.00
< 0.10

< 0.10
< 0.00
< 0.00
< 0.50
< 0.00

< 0.50
< 0.30


< 0.01
< 0.10
< 0.50
< 0.00
< 0.10
1.00
< 0.10
< 0.20
0.50

< 0.50
0.20

< 0.00
< 0.00
< 0.05
< 0.04
< 0.00


1.00
< 0.10
< 0.50

< 0.50
< 0.05
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
0.20
14.10

< 1.00
42.00
39.00
< 1.00
6.20

< 0.50
< 0.30


17.56
1.00
######
58.00
0.80
124.00
0.60
0.60
616.50

13.70
65.10

20.10
< 1.00
1.80
7.20
5.47


6.00
< 2.00
< 0.50

2.00
< 4.00
0.20

25.00

20.75
MAX
VALUE
(M9/L)
9.00
590.00

80.00
643.40
39.00
< 1.00
10.50

146.70
< 0.30


59.49
465.00
######
81.00
14.00
######
9.70
3.00
616.50

34.90
66.60

562.00
2.40
1.90
92.00
440.00


6.00
0.50
< 0.50

14.40
6.00
1.40

######

643.40
MIN
DETECTS
(M9/L)
0.10
0.10

0.50
0.04
0.20

0.10

0.50



0.01
0.50
2.70
0.09
0.10
1.00
0.10
0.50
0.50

0.50
0.20

0.11
0.70
1.50
0.40
0.25


1.00
0.10


0.50
2.00
0.20

0.01

0.01
MEDIAN
DETECTS
(M9/L)
1.10
2.00

4.30
3.20
6.90

1.95

9.30



0.99
1.25
13.20
1.80
0.40
3.00
0.30
0.60
1.40

1.81
1.20

1.70
1.00
1.80
3.60
2.31


1.70
0.10


1.70
4.80
0.45

3.00

3.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory anal
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                                         Occurrence of Unregulated Contaminants in Public Water Systems
Table A.56.C URCIS (Round 1) Data- Trichloroethylene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
2,027
365

3,079
18,304
170
66
336

2,463
60


2,741
3,686
22
316
1,785
514
2,750
327
69

644
139

1,772
1,595
191
2,541
6,366


12
1,278
10

3,987
462
310

58,387

53,674
TOTAL
UNIQUE
PWS
709
134

968
3,532
15
1
13

1,161
19


398
525
13
65
844
29
1,564
85
4

297
25

1,241
590
10
356
1,687


9
416
3

992
69
144

15,918

15,290
# GW PWS
576
96

893
3,503
12
0
11

1,052
15


352
291
9
58
798
26
1,539
71
4

254
25

1,238
555
8
252
1,557


8
394
0

937
32
116

14,682

14,198
# SW PWS
139
42

119
43
5
1
2

109
4


47
234
4
14
51
3
29
14
0

44
0

3
35
4
123
134


1
36
3

77
37
37

1,394

1,220
% PWS
>MRL
2.12%
12.69%

1 .03%
5.12%
46.67%
0.00%
30.77%

0.95%
0.00%


6.03%
7.62%
7.69%
70.77%
3.08%
100.00%
3.26%
4.71 %
100.00%

14.14%
100.00%

5.00%
0.51 %
10.00%
7.30%
1 .90%


100.00%
1 .44%
0.00%

1 .51 %
4.35%
2.78%

4.38%

3.54%
% GW PWS
>MRL
2.43%
14.58%

0.90%
5.14%
50.00%
0.00%
36.36%

0.95%
0.00%


5.40%
1 .72%
11.11%
70.69%
2.13%
100.00%
3.25%
5.63%
100.00%

15.35%
100.00%

5.01 %
0.54%
12.50%
8.33%
2.06%


100.00%
1 .27%
0.00%

1 .60%
9.38%
1 .72%

4.22%

3.37%
% SW PWS
>MRL
0.72%
9.52%

2.52%
9.30%
40.00%
0.00%
0.00%

0.92%
0.00%


10.64%
14.96%
0.00%
85.71 %
17.65%
100.00%
3.45%
0.00%
0.00%

6.82%
0.00%

0.00%
0.00%
0.00%
4.88%
0.00%


100.00%
2.78%
0.00%

0.00%
0.00%
5.41 %

6.67%

5.66%
% PWS
> 1/2 MCL
0.56%
5.97%

0.83%
2.97%
13.33%
0.00%
30.77%

0.52%
0.00%


2.76%
1 .33%
7.69%
40.00%
0.36%
62.07%
0.32%
1.18%
25.00%

6.06%
24.00%

1 .85%
0.00%
0.00%
3.37%
0.77%


44.44%
0.00%
0.00%

0.60%
2.90%
0.00%

1 .85%

1 .43%
% GW PWS
> 1/2 MCL
0.52%
6.25%

0.67%
2.97%
8.33%
0.00%
36.36%

0.57%
0.00%


2.56%
1 .03%
11.11%
36.21 %
0.38%
61 .54%
0.32%
1 .41 %
25.00%

6.69%
24.00%

1 .86%
0.00%
0.00%
3.97%
0.83%


37.50%
0.00%
0.00%

0.64%
6.25%
0.00%

1 .84%

1 .45%
% SW PWS
> 1/2 MCL
0.72%
4.76%

2.52%
4.65%
20.00%
0.00%
0.00%

0.00%
0.00%


4.26%
1 .71 %
0.00%
64.29%
0.00%
66.67%
0.00%
0.00%
0.00%

2.27%
0.00%

0.00%
0.00%
0.00%
1 .63%
0.00%


100.00%
0.00%
0.00%

0.00%
0.00%
0.00%

2.15%

1 .23%
% PWS
>MCL
0.42%
2.99%

0.62%
2.18%
6.67%
0.00%
15.38%

0.52%
0.00%


2.76%
0.76%
7.69%
32.31 %
0.12%
58.62%
0.13%
0.00%
25.00%

2.36%
16.00%

1 .21 %
0.00%
0.00%
1 .97%
0.65%


11.11%
0.00%
0.00%

0.20%
1 .45%
0.00%

1 .29%

0.98%
% GW PWS
>MCL
0.52%
3.13%

0.45%
2.17%
8.33%
0.00%
18.18%

0.57%
0.00%


2.56%
0.69%
11.11%
29.31 %
0.13%
57.69%
0.13%
0.00%
25.00%

2.76%
16.00%

1 .21 %
0.00%
0.00%
2.38%
0.71 %


12.50%
0.00%
0.00%

0.21 %
3.13%
0.00%

1 .29%

1 .00%
% SW PWS
>MCL
0.00%
2.38%

1 .68%
2.33%
0.00%
0.00%
0.00%

0.00%
0.00%


4.26%
0.85%
0.00%
50.00%
0.00%
66.67%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.81 %
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

1 .29%

0.66%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL violation. An MCL violation
occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Trichloroethylene is 5 ug/L
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.57.a  URCIS (Round 1) Data- Trichlorofluoromethane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
645
131

940
3,528
9
1
10
205
1,161


213
361
524
13
7
986

1,565
85
6

297
2

803
590
8
355
2,654
335
303

412
3

992
61
145

17,350

16,851
GWPWS
523
93

870
3,496
5
0
8
40
1,052


149
325
291
9
6
940

1,540
71
6

254
2

792
555
7
252
2,492
306
156

392
0

937
28
116

15,713

15,347
SWPWS
127
42

106
41
5
1
2
184
109


64
37
233
4
1
51

29
14
0

44
0

11
35
2
122
166
29
147

34
3

77
33
38

1,791

1,637
% PWS >
MRL
4.65%
10.69%

0.21 %
3.34%
77.78%
0.00%
10.00%
6.83%
0.17%


2.82%
0.00%
0.19%
0.00%
85.71 %
0.61 %

0.19%
4.71 %
100.00%

0.00%
100.00%

0.75%
0.00%
37.50%
2.25%
0.90%
0.30%
0.99%

0.97%
33.33%

0.81 %
4.92%
2.76%

1 .65%

1 .48%
%GW
PWS>
MRL
4.21 %
12.90%

0.11%
3.26%
60.00%
0.00%
12.50%
5.00%
0.19%


2.68%
0.00%
0.34%
0.00%
83.33%
0.53%

0.19%
5.63%
100.00%

0.00%
100.00%

0.76%
0.00%
42.86%
2.38%
0.96%
0.00%
0.64%

1 .02%
0.00%

0.85%
7.14%
1 .72%

1 .55%

1 .39%
%SW
PWS>
MRL
6.30%
7.14%

0.94%
12.20%
80.00%
0.00%
0.00%
6.52%
0.00%


3.13%
0.00%
0.00%
0.00%
100.00%
1 .96%

0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
1 .64%
0.00%
3.45%
1 .36%

0.00%
33.33%

0.00%
3.03%
5.26%

2.57%

2.32%
% PWS
>HAL
0.00%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
1.18%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.01 %

0.01 %
%GW
PWS
>HAL
0.00%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
1 .41 %
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.01 %

0.01 %
%sw
PWS
>HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
99%
VALUE
(M9/L)
8.40
4.40

< 5.00
2.60
5.10
< 0.50
1.00
4.00
< 0.50


0.58
< 2.00
< 1.00
< 0.50
5.00
< 0.50

< 2.00
150.00
1.60

< 0.50
7.00

< 2.40
< 1.00
3.30
< 1.00
< 1.00
< 0.50
< 0.50

< 5.00
1.30

< 0.50
3.00
1.10

0.70

0.60
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > HAL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HAL.
The Health Advisory Limit (HAL) for Trichlorofluoromethane is 175 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.57.b  URCIS (Round 1) Data- Trichlorofluoromethane Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
645
131

940
3,528
9
1
10
205
1,161


213
361
524
13
7
986

1,565
85
6

297
2

803
590
8
355
2,654
335
303

412
3

992
61
145

17,350

16,851
TOTAL #
SAMPLES
1,531
351

2,871
11,817
30
48
53
283
2,463


728
1,901
2,309
22
10
1,908

2,756
323
6

644
5

1,631
1,595
148
2,150
15,951
444
1,219

1,240
10

3,987
193
313
#GW
SAMPLES
1,274
244

2,223
11,717
18
0
44
59
1,864


485
1,498
1,170
18
8
1,440

2,677
297
6

569
5

1,444
1,475
136
1,616
15,034
363
433

1,135
0

3,656
83
259
#SW
SAMPLES
257
107

648
100
12
48
9
224
599


243
403
1,139
4
2
468

79
26
0

75
0

187
120
12
534
917
81
786

105
10

331
110
54

58,940

56,135
51 ,250

49,102
7,690

7,033
% TOTAL
SAMPLES
>MRL
4.96%
10.83%

0.07%
3.28%
76.67%
0.00%
1 .89%
5.30%
0.24%


1 .37%
0.00%
0.04%
0.00%
80.00%
0.37%

0.11%
3.72%
100.00%

0.00%
100.00%

0.43%
0.00%
5.41 %
0.79%
0.43%
0.23%
0.25%

0.65%
10.00%

0.53%
1.55%
1 .60%
%GW
SAMPLES
>MRL
5.18%
13.11%

0.04%
3.25%
77.78%
0.00%
2.27%
5.08%
0.32%


1 .65%
0.00%
0.09%
0.00%
75.00%
0.35%

0.11%
4.04%
100.00%

0.00%
100.00%

0.48%
0.00%
5.88%
0.87%
0.45%
0.00%
0.23%

0.70%
0.00%

0.57%
2.41%
1.16%
%SW
SAMPLES
>MRL
3.89%
5.61%

0.15%
7.00%
75.00%
0.00%
0.00%
5.36%
0.00%


0.82%
0.00%
0.00%
0.00%
100.00%
0.43%

0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.56%
0.00%
1 .23%
0.25%

0.00%
10.00%

0.00%
0.91%
3.70%

1 .26%

1.18%
1 .33%

1.25%
0.79%

0.65%
MIN VALUE
(M9/L)
< 0.00
< 0.09

< 0.05
< 0.00
< 0.00
< 0.50
< 0.40
< 0.00
< 0.50


< 0.07
< 0.10
< 0.50
< 0.50
< 0.00
< 0.10

< 0.40
< 0.20
0.70

< 0.50
0.70

< 0.00
< 0.00
< 0.20
< 0.08
< 0.20
< 0.50
< 0.03

< 0.00
< 1.00

< 0.50
< 0.10
< 0.20
99% VALUE
(M9/L)
8.40
4.40

< 5.00
2.60
5.10
< 0.50
1.00
4.00
< 0.50


0.58
< 2.00
< 1.00
< 0.50
5.00
< 0.50

< 2.00
150.00
1.60

< 0.50
7.00

< 2.40
< 1.00
3.30
< 1.00
< 1.00
< 0.50
< 0.50

< 5.00
1.30

< 0.50
3.00
1.10
MAX VALUE
(M9/L)
91.00
11.00

2.20
1 ,444.00
5.10
< 0.50
1.00
16.00
13.50


2.40
< 5.00
1.00
< 0.50
5.00
73.00

2.90
180.00
1.60

< 0.50
7.00

5.00
< 5.00
5.60
2.98
16.30
4.50
6.90

102.00
1.30

20.00
13.00
2.10

< 0.00

< 0.00
0.70

0.60
1 ,444.00

1 ,444.00
MIN
DETECTS
(M9/L)
0.20
0.09

0.50
0.10
0.11

1.00
0.01
6.50


0.07

1.00

0.40
0.10

0.40
0.80
0.70


0.70

0.90

0.30
0.60
0.30
4.50
0.70

0.10
1.30

0.50
3.00
1.00
MEDIAN
DETECTS
(M9/L)
3.35
2.00

1.35
1.30
1.00

1.00
1.00
10.10


0.62

1.00

1.24
0.30

1.80
120.00
0.85


1.50

1.00

1.25
0.90
1.23
4.50
0.80

0.10
1.30

0.70
3.00
1.20

0.01

0.01
1.30

1.30
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (1
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.57.C  URCIS (Round 1) Data- Trichlorofluoromethane Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,531
351

2,871
11,817
30
48
53
283
2,463


728
1,901
2,309
22
10
1,908

2,756
323
6

644
5

1,631
1,595
148
2,150
15,951
444
1,219

1,240
10

3,987
193
313

58,940

56,135
TOTAL
UNIQUE
PWS
645
131

940
3,528
9
1
10
205
1,161


213
361
524
13
7
986

1,565
85
6

297
2

803
590
8
355
2,654
335
303

412
3

992
61
145

17,350

16,851
#GW
PWS
523
93

870
3,496
5
0
8
40
1,052


149
325
291
9
6
940

1,540
71
6

254
2

792
555
7
252
2,492
306
156

392
0

937
28
116

15,713

15,347
# SW PWS
127
42

106
41
5
1
2
184
109


64
37
233
4
1
51

29
14
0

44
0

11
35
2
122
166
29
147

34
3

77
33
38

1,791

1,637
% PWS
>MRL
4.65%
10.69%

0.21%
3.34%
77.78%
0.00%
10.00%
6.83%
0.17%


2.82%
0.00%
0.19%
0.00%
85.71%
0.61%

0.19%
4.71%
100.00%

0.00%
100.00%

0.75%
0.00%
37.50%
2.25%
0.90%
0.30%
0.99%

0.97%
33.33%

0.81%
4.92%
2.76%

1 .65%

1 .48%
%GW
PWS
>MRL
4.21%
12.90%

0.11%
3.26%
60.00%
0.00%
12.50%
5.00%
0.19%


2.68%
0.00%
0.34%
0.00%
83.33%
0.53%

0.19%
5.63%
100.00%

0.00%
100.00%

0.76%
0.00%
42.86%
2.38%
0.96%
0.00%
0.64%

1 .02%
0.00%

0.85%
7.14%
1 .72%

1 .55%

1 .39%
%SW
PWS
>MRL
6.30%
7.14%

0.94%
12.20%
80.00%
0.00%
0.00%
6.52%
0.00%


3.13%
0.00%
0.00%
0.00%
100.00%
1 .96%

0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
1 .64%
0.00%
3.45%
1 .36%

0.00%
33.33%

0.00%
3.03%
5.26%

2.57%

2.32%
% PWS
> 1/2 HAL
0.16%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
2.35%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.24%
0.00%

0.00%
0.00%
0.00%

0.03%

0.02%
%GW
PWS
> 1/2 HAL
0.19%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
2.82%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.26%
0.00%

0.00%
0.00%
0.00%

0.03%

0.02%
%sw
PWS
> 1/2 HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>HAL
0.00%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
1.18%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.01%

0.01%
%GW
PWS
>HAL
0.00%
0.00%

0.00%
0.03%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
1.41%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.01%

0.01%
%sw
PWS
>HAL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for I;
"% > HAL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HAL.
The Health Advisory Limit (HAL) for Trichlorofluoromethane is 175 [ig/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.58.a URCIS (Round 1) Data-1,2,3-Trichloropropane Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
658
131

939
596
9
1
13
115
1,162
127
1,002
1,302
363
524
13
1
983

1,553
85

565
297
4

1,499
590
8
354
2,654
335
303

420
3
1
992
137
145

17,884

17,392
GWPWS
531
93

870
573
7
0
11
31
1,053
112
963
1,187
326
291
9
1
936

1,529
71

523
254
3

1,474
555
7
251
2,492
306
156

400

1
937
63
116

16,132

15,771
SWPWS
132
42

105
29
3
1
2
95
109
16
39
115
38
233
4
0
50

28
14

57
44
0

25
35
2
122
166
29
147

34
3
0
77
75
38

1,910

1,758
% PWS >
MRL
0.15%
3.05%

0.00%
0.84%
0.00%
0.00%
0.00%
0.87%
0.09%
3.15%
0.00%
0.23%
0.00%
0.00%
0.00%
100.00%
0.20%

0.00%
0.00%

0.18%
0.67%
100.00%

0.67%
0.00%
0.00%
0.56%
0.08%
0.60%
0.00%

1.19%
0.00%
100.00%
0.10%
0.00%
0.00%

0.29%

0.25%
%GW
PWS>
MRL
0.19%
3.23%

0.00%
0.87%
0.00%
0.00%
0.00%
0.00%
0.09%
3.57%
0.00%
0.25%
0.00%
0.00%
0.00%
100.00%
0.11%

0.00%
0.00%

0.00%
0.79%
100.00%

0.68%
0.00%
0.00%
0.80%
0.08%
0.65%
0.00%

1 .25%
0.00%
100.00%
0.11%
0.00%
0.00%

0.29%

0.25%
%sw
PWS>
MRL
0.00%
2.38%

0.00%
0.00%
0.00%
0.00%
0.00%
1 .05%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.00%

0.00%
0.00%

1 .75%
0.00%
100.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.26%

0.23%
% PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.07%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01%

0.01%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.07%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01%

0.01%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
99%
VALUE
(M9/L)
< 0.00
0.80

< 5.00
1.00
< 5.00
< 0.50
< 0.50
< 0.00
< 0.50
< 1.10
< 2.00
< 2.00
< 2.00
< 1.00
< 0.50
0.95
< 0.50

< 0.50
< 2.00

< 1.00
< 0.50
1.50

< 2.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50

< 5.00
< 1.00
1.10
< 0.50
< 4.00
< 1.00

< 2.00

< 2.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for 1,2,3-Trichloropropane is 40 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.58.b URCIS (Round 1) Data- 1,2,3-Trichloropropane Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
658
131

939
596
9
1
13
115
1,162
127
1,002
1,302
363
524
13
1
983

1,553
85

565
297
4

1,499
590
8
354
2,654
335
303

420
3
1
992
137
145

17,884

17,392
TOTAL #
SAMPLES
1,600
351

2,876
1,649
33
62
333
156
2,460
1,221
1,907
6,004
1,910
2,076
22
1
1,753

2,655
324

1,624
644
5

3,119
1,595
148
2,146
15,948
444
1,220

1,309
10
1
3,987
384
313

60,290

57,205
#GW
SAMPLES
1,317
244

2,236
1,581
30
0
189
48
1,862
1,081
1,696
5,038
1,501
1,119
18
1
1,379

2,587
297

1,376
569
3

2,764
1,475
136
1,611
15,030
363
433

1,198
0
1
3,656
162
259

51,260

48,974
#SW
SAMPLES
283
107

640
68
3
62
144
108
598
140
211
966
409
957
4
0
374

68
27

248
75
2

355
120
12
535
918
81
787

111
10
0
331
222
54

9,030

8,231
% TOTAL
SAMPLES
>MRL
0.06%
1.14%

0.00%
0.61 %
0.00%
0.00%
0.00%
0.64%
0.12%
0.90%
0.00%
0.10%
0.00%
0.00%
0.00%
100.00%
0.11%

0.00%
0.00%

0.06%
0.78%
100.00%

0.48%
0.00%
0.00%
0.09%
0.01%
0.45%
0.00%

0.69%
0.00%
100.00%
0.10%
0.00%
0.00%

0.14%

0.13%
%GW
SAMPLES
>MRL
0.08%
1 .23%

0.00%
0.63%
0.00%
0.00%
0.00%
0.00%
0.16%
1 .02%
0.00%
0.12%
0.00%
0.00%
0.00%
100.00%
0.07%

0.00%
0.00%

0.00%
0.88%
100.00%

0.54%
0.00%
0.00%
0.12%
0.01%
0.55%
0.00%

0.75%
0.00%
100.00%
0.11%
0.00%
0.00%

0.15%

0.15%
%SW
SAMPLES
>MRL
0.00%
0.93%

0.00%
0.00%
0.00%
0.00%
0.00%
0.93%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.27%

0.00%
0.00%

0.40%
0.00%
100.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.07%

0.05%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.20
< 0.00
< 0.16
< 0.50
< 0.30
< 0.00
< 0.00
< 0.00
< 0.40
< 0.10
< 0.10
< 0.50
< 0.50
0.95
< 0.10

< 0.50
< 0.20

< 0.50
< 0.50
0.50

< 0.00
< 0.00
< 0.20
< 0.03
< 0.20
< 0.15
< 0.04

< 0.00
< 1.00
1.10
< 0.50
< 0.10
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
0.80

< 5.00
1.00
< 5.00
< 0.50
< 0.50
< 0.00
< 0.50
< 1.10
< 2.00
< 2.00
< 2.00
< 1.00
< 0.50
0.95
< 0.50

< 0.50
< 2.00

< 1.00
< 0.50
1.50

< 2.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50

< 5.00
< 1.00
1.10
< 0.50
< 4.00
< 1.00

< 2.00

< 2.00
MAX
VALUE
(M9/L)
8.70
3.70

< 10.00
6.00
< 5.00
< 0.50
< 0.50
1.00
2.10
3.20
< 2.00
0.50
< 5.00
< 1.00
< 0.50
0.95
0.40

< 5.00
< 2.00

0.75
20.90
1.50

112.00
< 5.00
< 0.20
0.80
4.00
0.19
< 0.50

1.70
< 1.00
1.10
1.40
< 5.00
< 1.00

112.00

112.00
MIN
DETECTS
(M9/L)
8.70
0.80


0.10



1.00
0.60
0.40

0.16



0.95
0.10




0.75
0.93
0.50

0.30


0.60
3.60
0.15


0.10

1.10
0.80



0.10

0.10
MEDIAN
DETECTS
(M9/L)
8.70
0.95


0.61



1.00
1.60
1.30

0.22



0.95
0.25




0.75
1.08
1.00

4.63


0.70
3.80
0.17


0.10

1.10
1.05



0.93

0.92
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.58.C URCIS (Round 1) Data-1,2,3-Trichloropropane Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,600
351

2,876
1,649
33
62
333
156
2,460
1,221
1,907
6,004
1,910
2,076
22
1
1,753

2,655
324

1,624
644
5

3,119
1,595
148
2,146
15,948
444
1,220

1,309
10
1
3,987
384
313

60,290

57,205
TOTAL
UNIQUE
PWS
658
131

939
596
9
1
13
115
1,162
127
1,002
1,302
363
524
13
1
983

1,553
85

565
297
4

1,499
590
8
354
2,654
335
303

420
3
1
992
137
145

17,884

17,392
#GW
PWS
531
93

870
573
7
0
11
31
1,053
112
963
1,187
326
291
9
1
936

1,529
71

523
254
3

1,474
555
7
251
2,492
306
156

400
0
1
937
63
116

16,132

15,771
#SW
PWS
132
42

105
29
3
1
2
95
109
16
39
115
38
233
4
0
50

28
14

57
44
1

25
35
2
122
166
29
147

34
3
0
77
75
38

1,910

1,758
% PWS
>MRL
0.15%
3.05%

0.00%
0.84%
0.00%
0.00%
0.00%
0.87%
0.09%
3.15%
0.00%
0.23%
0.00%
0.00%
0.00%
100.00%
0.20%

0.00%
0.00%

0.18%
0.67%
100.00%

0.67%
0.00%
0.00%
0.56%
0.08%
0.60%
0.00%

1.19%
0.00%
100.00%
0.10%
0.00%
0.00%

0.29%

0.25%
%GW
PWS
>MRL
0.19%
3.23%

0.00%
0.87%
0.00%
0.00%
0.00%
0.00%
0.09%
3.57%
0.00%
0.25%
0.00%
0.00%
0.00%
100.00%
0.11%

0.00%
0.00%

0.00%
0.79%
100.00%

0.68%
0.00%
0.00%
0.80%
0.08%
0.65%
0.00%

1 .25%
0.00%
100.00%
0.11%
0.00%
0.00%

0.29%

0.25%
%sw
PWS
>MRL
0.00%
2.38%

0.00%
0.00%
0.00%
0.00%
0.00%
1.05%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
2.00%

0.00%
0.00%

1.75%
0.00%
100.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.26%

0.23%
% PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.34%
0.00%

0.07%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01 %

0.01 %
%GW
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.39%
0.00%

0.07%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01%

0.01%
%sw
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
% PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.07%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01%

0.01%
%GW
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.07%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01 %

0.01 %
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the
The Maximum Contaminant Level (MCL) for 1,2,3-Trichloropropane is 40 ug/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                 Occurrence of Unregulated Contaminants in Public Water Systems
Table A.59.a URCIS (Round 1) Data-1,2,4-Trimethylbenzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
667
131

447
149
5
1
10

1,162


212
358
524
13
4
983

1,553
74
6

297
11
1
785
590
8
346
2,654
335
303

411
3

992
57
145

13,237

12,755
GWPWS
541
93

406
135
3
0
8

1,053


149
322
291
9
4
936

1,529
60
6

254
11
1
774
555
7
247
2,492
306
156

391
0

937
26
116

11,818

1 1 ,462
SWPWS
131
42

47
20
3
1
2

109


63
37
233
4
1
50

28
14
0

44
0
0
11
35
2
117
166
29
147

34
3

77
31
38

1,519

1,372
% PWS >
MRL
2.85%
6.87%

0.89%
2.68%
0.00%
0.00%
0.00%

0.17%


0.47%
0.84%
1.15%
0.00%
100.00%
0.41%

0.32%
0.00%
100.00%

0.34%
100.00%
100.00%
0.38%
0.00%
12.50%
0.29%
0.75%
0.90%
2.97%

1 .22%
0.00%

0.30%
0.00%
3.45%

0.98%

0.83%
%GW
PWS>
MRL
2.96%
8.60%

0.74%
2.96%
0.00%
0.00%
0.00%

0.19%


0.67%
0.93%
1 .03%
0.00%
100.00%
0.21%

0.33%
0.00%
100.00%

0.39%
100.00%
100.00%
0.39%
0.00%
14.29%
0.00%
0.80%
0.98%
0.64%

1 .02%
0.00%

0.32%
0.00%
4.31%

0.93%

0.76%
%sw
PWS>
MRL
2.29%
2.38%

2.13%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
1 .29%
0.00%
100.00%
4.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.85%
0.00%
0.00%
5.44%

2.94%
0.00%

0.00%
0.00%
0.00%

1 .38%

1 .38%
% PWS >
MCL

















%GW
PWS>
MCL

















%SW
PWS>
MCL

















There is no Health Reference Level
(HRL), Maximum Contaminant
Level (MCL), or Health Advisory
Level (HAL) for
1 ,2,4-Trimethylbenzene.




























































99%
VALUE
(M9/L)
0.30
2.70

< 2.00
< 0.50
< 0.66
< 0.50
< 0.30

< 0.50


< 3.00
< 2.00
< 1.00
< 0.50
0.60
< 0.50

< 0.50
< 50.00
26.50

< 0.50
41.70
10.00
< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50

< 10.00
< 1.00

< 0.50
< 4.00
0.30

< 2.00

< 2.00
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.59.b URCIS (Round 1) Data- 1,2,4-Trimethylbenzene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
667
131

447
149
5
1
10

1,162


212
358
524
13
4
983

1,553
74
6

297
11
1
785
590
8
346
2,654
335
303

411
3

992
57
145

13,237

12,755
TOTAL #
SAMPLES
1,753
353

1,096
1,109
8
43
53

2,462


725
1,889
2,076
22
7
1,750

2,652
275
9

644
15
2
1,606
1,595
148
1,988
15,949
444
1,220

1,234
10

3,987
169
313

45,606

43,026
#GW
SAMPLES
1,485
246

932
1,051
5
0
44

1,865


484
1,487
1,119
18
6
1,376

2,584
246
9

569
15
2
1,419
1,475
136
1,489
15,033
363
433

1,129
0

3,656
63
259

38,998

37,028
#SW
SAMPLES
268
107

164
58
3
43
9

597


241
402
957
4
1
374

68
29
0

75
0
0
187
120
12
499
916
81
787

105
10

331
106
54

6,608

5,998
% TOTAL
SAMPLES
>MRL
1 .48%
3.68%

0.64%
0.90%
0.00%
0.00%
0.00%

0.08%


0.14%
0.26%
0.48%
0.00%
100.00%
0.29%

0.19%
0.00%
100.00%

0.16%
100.00%
100.00%
0.19%
0.00%
0.68%
0.05%
0.14%
0.90%
0.74%

0.89%
0.00%

0.15%
0.00%
1 .60%

0.40%

0.34%
%GW
SAMPLES
>MRL
1 .48%
4.88%

0.32%
0.95%
0.00%
0.00%
0.00%

0.11%


0.21%
0.34%
0.27%
0.00%
100.00%
0.15%

0.19%
0.00%
100.00%

0.18%
100.00%
100.00%
0.21%
0.00%
0.74%
0.00%
0.15%
1.10%
0.23%

0.89%
0.00%

0.16%
0.00%
1 .93%

0.39%

0.32%
%SW
SAMPLES
>MRL
1 .49%
0.93%

2.44%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.73%
0.00%
100.00%
0.80%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.20%
0.00%
0.00%
1 .02%

0.95%
0.00%

0.00%
0.00%
0.00%

0.45%

0.47%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.13
< 0.00
< 0.10

< 0.50


< 0.02
< 0.10
< 0.50
< 0.50
0.07
< 0.10

< 0.20
< 0.20
0.60

< 0.50
0.30
7.40
< 0.00
< 0.00
< 0.20
< 0.13
< 0.20
< 0.17
< 0.05

< 0.10
< 1.00

< 0.50
< 0.50
< 0.00

< 0.00

< 0.00
99% VALUE
(M9/L)
0.30
2.70

< 2.00
< 0.50
< 0.66
< 0.50
< 0.30

< 0.50


< 3.00
< 2.00
< 1.00
< 0.50
0.60
< 0.50

< 0.50
< 50.00
26.50

< 0.50
41.70
10.00
< 1.00
< 1.00
< 0.20
< 1.00
< 2.00
< 0.50
< 0.50

< 10.00
< 1.00

< 0.50
< 4.00
0.30

< 2.00

< 2.00
MAX
VALUE
(M9/L)
56.70
19.20

10.00
51.00
< 0.66
< 0.50
< 0.30

1.20


0.02
5.10
77.00
< 0.50
0.60
1.00

2.20
< 50.00
26.50

13.80
41.70
10.00
1.00
< 5.00
0.40
0.76
65.60
1.01
16.80

1.00
< 1.00

1.10
< 4.00
5.70

77.00

77.00
MIN
DETECTS
(M9/L)
0.02
0.50

0.05
0.50




0.60


0.02
0.50
1.00

0.07
0.10

0.50

0.60

13.80
0.30
7.40
0.04

0.40
0.76
0.40
0.17
0.60

0.10


0.60

0.20

0.02

0.02
MEDIAN
DETECTS
(M9/L)
0.50
1.50

10.00
5.35




0.90


0.02
4.00
3.50

0.14
0.30

0.60

1.00

13.80
0.60
8.70
0.04

0.40
0.76
2.00
0.46
2.10

0.10


0.95

0.80

0.80

1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                             Occurrence of Unregulated Contaminants in Public Water Systems
Table A.59.C  URCIS (Round 1) Data- 1,2,4-Trimethylbenzene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,753
353

1,096
1,109
8
43
53

2,462


725
1,889
2,076
22
7
1,750

2,652
275
9

644
15
2
1,606
1,595
148
1,988
15,949
444
1,220

1,234
10

3,987
169
313

45,606

43,026
TOTAL
UNIQUE
PWS
667
131

447
149
5
1
10

1,162


212
358
524
13
4
983

1,553
74
6

297
11
1
785
590
8
346
2,654
335
303

411
3

992
57
145

13,237

12,755
#GW
PWS
541
93

406
135
3
0
8

1,053


149
322
291
9
4
936

1,529
60
6

254
11
1
774
555
7
247
2,492
306
156

391
0

937
26
116

11,818

1 1 ,462
# SW PWS
131
42

47
20
3
1
2

109


63
37
233
4
1
50

28
14
0

44
0
0
11
35
2
117
166
29
147

34
3

77
31
38

1,519

1,372
% PWS
>MRL
2.85%
6.87%

0.89%
2.68%
0.00%
0.00%
0.00%

0.17%


0.47%
0.84%
1.15%
0.00%
100.00%
0.41%

0.32%
0.00%
100.00%

0.34%
100.00%
100.00%
0.38%
0.00%
12.50%
0.29%
0.75%
0.90%
2.97%

1 .22%
0.00%

0.30%
0.00%
3.45%

0.98%

0.83%
%GW
PWS
>MRL
2.96%
8.60%

0.74%
2.96%
0.00%
0.00%
0.00%

0.19%


0.67%
0.93%
1.03%
0.00%
100.00%
0.21%

0.33%
0.00%
100.00%

0.39%
100.00%
100.00%
0.39%
0.00%
14.29%
0.00%
0.80%
0.98%
0.64%

1 .02%
0.00%

0.32%
0.00%
4.31 %

0.93%

0.76%
%SW
PWS
>MRL
2.29%
2.38%

2.13%
0.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
1.29%
0.00%
100.00%
4.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.85%
0.00%
0.00%
5.44%

2.94%
0.00%

0.00%
0.00%
0.00%

1 .38%

1 .38%
% PWS
> 1/2 MCL

















%GW
PWS
> 1/2 MCL

















%SW
PWS
> 1/2 MCL

















% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level (HRL), Maximum
Contaminant Level (MCL), or Health Advisory Level (HAL) for
1 ,2,4-Trimethylbenzene.
















































































































































PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for labor;
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                 Occurrence of Unregulated Contaminants in Public Water Systems
Table A.60.a URCIS (Round 1) Data-1,3,5-Trimethylbenzene Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
671
131

451
143
7
1
10

1,163


213
357
524
13
4
983

1,553
74
7

297
3
1
783
590
8
357
2,569
335
303

411
3

992
57
145

13,159

12,671
GWPWS
545
93

409
128
3
0
8

1,054


149
321
291
9
4
936

1,529
60
7

254
3
1
772
555
7
253
2,411
306
156

391
0

937
26
116

1 1 ,734

1 1 ,379
SWPWS
131
42

48
21
5
1
2

109


64
37
233
4
0
50

28
14
0

44
0
0
11
35
2
123
161
29
147

34
3

77
31
38

1,524

1,370
% PWS >
MRL
2.09%
3.82%

0.89%
2.10%
28.57%
0.00%
0.00%

0.26%


0.47%
0.56%
0.95%
0.00%
100.00%
0.20%

0.13%
0.00%
100.00%

0.67%
100.00%
100.00%
0.51%
0.00%
25.00%
1.12%
0.78%
0.00%
0.33%

1 .22%
0.00%

0.10%
0.00%
2.07%

0.76%

0.61%
%GW
PWS>
MRL
2.02%
5.38%

0.73%
2.34%
0.00%
0.00%
0.00%

0.28%


0.67%
0.62%
1 .03%
0.00%
100.00%
0.00%

0.13%
0.00%
100.00%

0.79%
100.00%
100.00%
0.52%
0.00%
28.57%
0.79%
0.83%
0.00%
0.00%

1 .02%
0.00%

0.11%
0.00%
2.59%

0.73%

0.59%
%sw
PWS>
MRL
2.29%
0.00%

0.00%
9.52%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
7.14%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.92%

0.66%
% PWS >
MCL

















%GW
PWS>
MCL

















%SW
PWS>
MCL

















There is no Health Reference Level
(HRL), Maximum Contaminant
Level (MCL), or Health Advisory
Level (HAL) for
1 ,3,5-Trimethylbenzene.




























































99%
VALUE
(M9/L)
0.20
0.94

< 2.00
1.20
1.15
< 0.50
< 1.10

< 0.50


< 5.00
< 2.00
< 1.00
< 0.50
1.40
< 0.50

< 0.50
< 50.00
4.90

< 0.50
12.40
2.40
< 1.00
< 1.00
0.20
< 1.00
< 2.00
< 0.50
< 0.50

0.10
< 1.00

< 0.50
< 4.00
< 1.00

< 2.00

< 2.00
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.60.b URCIS (Round 1) Data- 1,3,5-Trimethylbenzene Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
671
131

451
143
7
1
10

1,163


213
357
524
13
4
983

1,553
74
7

297
3
1
783
590
8
357
2,569
335
303

411
3

992
57
145

13,159

12,671
TOTAL #
SAMPLES
1,765
352

1,107
1,052
10
43
53

2,463


729
1,889
2,075
22
6
1,749

2,656
272
7

644
5
2
1,604
1,595
148
2,085
14,896
444
1,220

1,235
10

3,987
169
313

44,607

41 ,944
#GW
SAMPLES
1,495
245

942
993
5
0
44

1,865


485
1,486
1,119
18
6
1,375

2,588
246
7

569
5
2
1,417
1,475
136
1,559
14,136
363
433

1,130
0

3,656
63
259

38,122

36,094
#SW
SAMPLES
270
107

165
59
5
43
9

598


244
403
956
4
0
374

68
26
0

75
0
0
187
120
12
526
760
81
787

105
10

331
106
54

6,485

5,850
% TOTAL
SAMPLES
>MRL
1.13%
1 .70%

0.63%
1 .43%
20.00%
0.00%
0.00%

0.16%


0.55%
0.21%
0.29%
0.00%
100.00%
0.11%

0.08%
0.00%
100.00%

0.31 %
100.00%
100.00%
0.25%
0.00%
1 .35%
0.29%
0.15%
0.00%
0.08%

1 .30%
0.00%

0.03%
0.00%
0.96%

0.34%

0.29%
%GW
SAMPLES
>MRL
1.14%
2.45%

0.32%
1 .51 %
0.00%
0.00%
0.00%

0.21%


0.82%
0.27%
0.27%
0.00%
100.00%
0.00%

0.08%
0.00%
100.00%

0.35%
100.00%
100.00%
0.28%
0.00%
1 .47%
0.26%
0.16%
0.00%
0.00%

1 .33%
0.00%

0.03%
0.00%
1.16%

0.35%

0.29%
%SW
SAMPLES
>MRL
1.11%
0.00%

0.00%
3.39%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
3.85%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.28%

0.17%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.05
< 0.50
< 0.30

< 0.50


< 0.02
< 0.10
< 0.50
< 0.50
0.07
< 0.20

< 0.20
< 0.20
0.40

< 0.50
0.20
2.00
< 0.00
< 0.00
< 0.20
< 0.05
< 0.20
0.50
< 0.00

< 0.10
< 1.00

< 0.50
< 0.50
< 0.20

< 0.00

< 0.00
99% VALUE
(M9/L)
0.20
0.94

< 2.00
1.20
1.15
< 0.50
< 1.10

< 0.50


< 5.00
< 2.00
< 1.00
< 0.50
1.40
< 0.50

< 0.50
< 50.00
4.90

< 0.50
12.40
2.40
< 1.00
< 1.00
0.20
< 1.00
< 2.00
< 0.50
< 0.50

0.10
< 1.00

< 0.50
< 4.00
< 1.00

< 2.00

< 2.00
MAX
VALUE
(M9/L)
64.90
2.50

10.00
44.80
1.15
< 0.50
< 1.10

1.90


0.22
1.80
16.00
< 0.50
1.40
0.40

0.90
< 50.00
4.90

3.90
12.40
2.40
2.00
< 5.00
0.40
14.00
5.50
< 0.50
2.80

1.00
< 1.00

4.60
< 4.00
2.40

64.90

64.90
MIN
DETECTS
(M9/L)
0.10
0.60

0.05
0.50
0.13



0.60


0.02
1.70
1.00

0.07
0.30

0.30

0.40

1.10
0.20
2.00
0.01

0.20
0.60
0.20

2.80

0.10


4.60

0.30

0.01

0.01
MEDIAN
DETECTS
(M9/L)
0.55
1.27

10.00
2.00
0.64



1.35


0.22
1.75
1.50

0.18
0.35

0.60

1.20

2.50
1.00
2.20
0.51

0.30
1.65
2.00

2.80

0.15


4.60

0.60

1.00

1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                             Occurrence of Unregulated Contaminants in Public Water Systems
Table A.60.C  URCIS (Round 1) Data- 1,3,5-Trimethylbenzene Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,765
352

1,107
1,052
10
43
53

2,463


729
1,889
2,075
22
6
1,749

2,656
272
7

644
5
2
1,604
1,595
148
2,085
14,896
444
1,220

1,235
10

3,987
169
313

44,607

41 ,944
TOTAL
UNIQUE
PWS
671
131

451
143
7
1
10

1,163


213
357
524
13
4
983

1,553
74
7

297
3
1
783
590
8
357
2,569
335
303

411
3

992
57
145

13,159

12,671
#GW
PWS
545
93

409
128
3
0
8

1,054


149
321
291
9
4
936

1,529
60
7

254
3
1
772
555
7
253
2,411
306
156

391
0

937
26
116

11,734

1 1 ,379
# SW PWS
131
42

48
21
5
1
2

109


64
37
233
4
0
50

28
14
0

44
0
0
11
35
2
123
161
29
147

34
3

77
31
38

1,524

1,370
% PWS
>MRL
2.09%
3.82%

0.89%
2.10%
28.57%
0.00%
0.00%

0.26%


0.47%
0.56%
0.95%
0.00%
100.00%
0.20%

0.13%
0.00%
100.00%

0.67%
100.00%
100.00%
0.51%
0.00%
25.00%
1.12%
0.78%
0.00%
0.33%

1 .22%
0.00%

0.10%
0.00%
2.07%

0.76%

0.61%
%GW
PWS
>MRL
2.02%
5.38%

0.73%
2.34%
0.00%
0.00%
0.00%

0.28%


0.67%
0.62%
1.03%
0.00%
100.00%
0.00%

0.13%
0.00%
100.00%

0.79%
100.00%
100.00%
0.52%
0.00%
28.57%
0.79%
0.83%
0.00%
0.00%

1 .02%
0.00%

0.11%
0.00%
2.59%

0.73%

0.59%
%SW
PWS
>MRL
2.29%
0.00%

0.00%
9.52%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
7.14%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.92%

0.66%
% PWS
> 1/2 MCL

















%GW
PWS
> 1/2 MCL

















%SW
PWS
> 1/2 MCL

















% PWS
>MCL

















%GW
PWS
>MCL

















%SW
PWS
>MCL

















There is no Health Reference Level (HRL), Maximum
Contaminant Level (MCL), or Health Advisory Level (HAL) for
1 ,3,5-Trimethylbenzene.
















































































































































PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for labor;
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                  Occurrence of Unregulated Contaminants in Public Water Systems
Table A.61 .a URCIS (Round 1) Data- Vinyl Chloride Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
665
131

971
3,485
11
1
13

1,162
19


393
525
13
3
844
3
1,553
85
2

297


1,242
590
10
355
1,684


1
418
3

992
69
144

15,684

15,184
GWPWS
537
93

895
3,456
9
0
11

1,053
15


349
291
9
3
798
2
1,529
71
2

254


1,239
555
8
252
1,554


1
396
0

937
32
116

14,467

14,099
SWPWS
134
42

119
40
3
1
2

109
4


45
234
4
0
51
1
28
14
0

44


3
35
4
122
134


0
36
3

77
37
37

1,363

1,209
% PWS >
MRL
0.75%
1 .53%

0.93%
0.26%
18.18%
0.00%
7.69%

0.00%
0.00%


4.33%
0.95%
0.00%
33.33%
0.00%
100.00%
0.00%
0.00%
100.00%

1.01%


0.48%
0.00%
0.00%
0.85%
0.71%


1
1 .67%
0.00%

0.10%
0.00%
0.00%

0.57%

0.50%
%GW
PWS>
MRL
0.93%
2.15%

0.89%
0.26%
22.22%
0.00%
9.09%

0.00%
0.00%


2.87%
0.00%
0.00%
33.33%
0.00%
100.00%
0.00%
0.00%
100.00%

1.18%


0.48%
0.00%
0.00%
0.79%
0.77%


1
1 .52%
0.00%

0.11%
0.00%
0.00%

0.50%

0.44%
%sw
PWS>
MRL
0.00%
0.00%

1 .68%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%


15.56%
2.14%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.82%
0.00%


0
2.78%
0.00%

0.00%
0.00%
0.00%

1 .25%

1 .24%
% PWS
>MCL
0.30%
0.76%

0.00%
0.20%
18.18%
0.00%
7.69%

0.00%
0.00%


3.31%
0.76%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%

0.67%


0.32%
0.00%
0.00%
0.28%
0.42%


0
0.24%
0.00%

0.10%
0.00%
0.00%

0.31%

0.28%
%GW
PWS
>MCL
0.37%
1 .08%

0.00%
0.20%
22.22%
0.00%
9.09%

0.00%
0.00%


2.01%
0.00%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%

0.79%


0.32%
0.00%
0.00%
0.40%
0.45%


0
0.25%
0.00%

0.11%
0.00%
0.00%

0.26%

0.23%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%


13.33%
1.71%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%


0
0.00%
0.00%

0.00%
0.00%
0.00%

0.81%

0.83%
99%
VALUE
(M9/L)
< 0.00
< 0.50

< 3.00
< 1.00
4.00
< 1.00
< 0.50

< 0.50
< 0.30


2.73
< 1.00
< 0.50
0.17
< 0.50
46.00
< 1.00
< 2.00
0.90

1.69


< 1.80
< 1.00
< 1.00
< 2.00
< 1.00


1.00
< 5.00
< 0.50

< 0.50
< 2.00
< 1.00

< 2.00

< 2.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
The Maximum Contaminant Level (MCL) for Vinyl Chloride is 2 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.61.b URCIS (Round 1) Data- Vinyl Chloride Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
665
131

971
3,485
11
1
13

1,162
19


393
525
13
3
844
3
1,553
85
2

297


1,242
590
10
355
1,684


1
418
3

992
69
144

15,684

15,184
TOTAL #
SAMPLES
1,720
351

3,061
10,954
38
75
333

2,464
60


2,355
2,899
22
5
1,786
23
2,656
320
2

644


1,775
1,595
191
2,160
6,363


1
1,288
10

3,987
195
310

47,643

44,463
#GW
SAMPLES
1,427
244

2,345
10,846
35
0
189

1,865
33


1,799
1,329
18
5
1,306
12
2,588
294
2

569


1,766
1,475
155
1,616
5,748


1
1,173
0

3,656
89
259

40,844

38,517
#SW
SAMPLES
293
107

716
108
3
75
144

599
27


556
1,570
4
0
480
11
68
26
0

75


9
120
36
544
615


0
115
10

331
106
51

6,799

5,946
% TOTAL
SAMPLES
>MRL
0.35%
0.57%

0.56%
0.16%
5.26%
0.00%
0.30%

0.00%
0.00%


4.16%
0.17%
0.00%
20.00%
0.00%
100.00%
0.00%
0.00%
100.00%

1 .55%


0.79%
0.00%
0.00%
0.65%
0.28%


100.00%
0.78%
0.00%

0.03%
0.00%
0.00%

0.51 %

0.45%
%GW
SAMPLES
>MRL
0.42%
0.82%

0.64%
0.17%
5.71%
0.00%
0.53%

0.00%
0.00%


3.28%
0.00%
0.00%
20.00%
0.00%
100.00%
0.00%
0.00%
100.00%

1 .76%


0.79%
0.00%
0.00%
0.80%
0.31 %


100.00%
0.77%
0.00%

0.03%
0.00%
0.00%

0.45%

0.39%
%SW
SAMPLES
>MRL
0.00%
0.00%

0.28%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%


7.01%
0.32%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.18%
0.00%


0.00%
0.87%
0.00%

0.00%
0.00%
0.00%

0.87%

0.79%
MIN VALUE
(M9/L)
< 0.00
< 0.50

< 0.05
< 0.00
< 0.04
< 0.50
< 0.10

< 0.50
< 0.30


< 0.06
< 0.10
< 0.50
< 0.00
< 0.10
1.00
< 0.50
< 0.20
0.80

< 0.50


< 0.00
< 0.00
< 0.10
< 0.17
< 0.20


1.00
< 0.10
< 0.50

< 0.50
< 0.20
< 0.40

< 0.00

< 0.00
99% VALUE
(M9/L)
< 0.00
< 0.50

< 3.00
< 1.00
4.00
< 1.00
< 0.50

< 0.50
< 0.30


2.73
< 1.00
< 0.50
0.17
< 0.50
46.00
< 1.00
< 2.00
0.90

1.69


< 1.80
< 1.00
< 1.00
< 2.00
< 1.00


1.00
< 5.00
< 0.50

< 0.50
< 2.00
< 1.00

< 2.00

< 2.00
MAX
VALUE
(M9/L)
3.00
2.00

1.00
44.00
4.00
< 1.00
7.30

< 0.50
< 0.30


19.00
18.00
< 0.50
0.17
< 1.00
46.00
< 10.00
< 2.00
0.90

5.50


82.70
< 5.00
< 1.00
15.00
41.80


1.00
7.00
< 0.50

2.80
< 2.00
< 1.00

82.70

82.70
MIN
DETECTS
(M9/L)
0.50
0.70

0.50
0.07
1.30

7.30





0.13
1.00

0.17

1.00


0.80

0.74


0.35


0.60
0.53


1.00
0.10


2.80



0.07

0.07
MEDIAN
DETECTS
(M9/L)
1.90
1.35

1.00
8.65
2.65

7.30





1.55
7.00

0.17

10.00


0.85

2.28


1.47


1.00
1.65


1.00
0.10


2.80



1.56

1.55
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.61 .c URCIS (Round 1) Data- Vinyl Chloride Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
1,720
351

3,061
10,954
38
75
333

2,464
60


2,355
2,899
22
5
1,786
23
2,656
320
2

644


1,775
1,595
191
2,160
6,363


1
1,288
10

3,987
195
310

47,643

44,463
TOTAL
UNIQUE
PWS
665
131

971
3,485
11
1
13

1,162
19


393
525
13
3
844
3
1,553
85
2

297


1,242
590
10
355
1,684


1
418
3

992
69
144

15,684

15,184
#GW
PWS
537
93

895
3,456
9
0
11

1,053
15


349
291
9
3
798
2
1,529
71
2

254


1,239
555
8
252
1,554


1
396
0

937
32
116

14,467

14,099
#SW
PWS
134
42

119
40
3
1
2

109
4


45
234
4
0
51
1
28
14
0

44


3
35
4
122
134


0
36
3

77
37
37

1,363

1,209
% PWS
>MRL
0.75%
1.53%

0.93%
0.26%
18.18%
0.00%
7.69%

0.00%
0.00%


4.33%
0.95%
0.00%
33.33%
0.00%
100.00%
0.00%
0.00%
100.00%

1.01%


0.48%
0.00%
0.00%
0.85%
0.71%


100.00%
1.67%
0.00%

0.10%
0.00%
0.00%

0.57%

0.50%
%GW
PWS
>MRL
0.93%
2.15%

0.89%
0.26%
22.22%
0.00%
9.09%

0.00%
0.00%


2.87%
0.00%
0.00%
33.33%
0.00%
100.00%
0.00%
0.00%
100.00%

1.18%


0.48%
0.00%
0.00%
0.79%
0.77%


100.00%
1 .52%
0.00%

0.11%
0.00%
0.00%

0.50%

0.44%
%sw
PWS
>MRL
0.00%
0.00%

1.68%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%


15.56%
2.14%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.82%
0.00%


0.00%
2.78%
0.00%

0.00%
0.00%
0.00%

1.25%

1.24%
% PWS
> 1/2 MCL
0.30%
0.76%

0.00%
0.20%
18.18%
0.00%
7.69%

0.00%
0.00%


3.31 %
0.76%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%

0.67%


0.32%
0.00%
0.00%
0.28%
0.42%


0.00%
0.24%
0.00%

0.10%
0.00%
0.00%

0.31 %

0.28%
%GW
PWS
> 1/2 MCL
0.37%
1.08%

0.00%
0.20%
22.22%
0.00%
9.09%

0.00%
0.00%


2.01%
0.00%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%

0.79%


0.32%
0.00%
0.00%
0.40%
0.45%


0.00%
0.25%
0.00%

0.11%
0.00%
0.00%

0.26%

0.23%
%sw
PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%


13.33%
1 .71 %
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.81 %

0.83%
% PWS
>MCL
0.30%
0.00%

0.00%
0.20%
9.09%
0.00%
7.69%

0.00%
0.00%


1.78%
0.76%
0.00%
0.00%
0.00%
66.67%
0.00%
0.00%
0.00%

0.67%


0.24%
0.00%
0.00%
0.28%
0.24%


0.00%
0.24%
0.00%

0.10%
0.00%
0.00%

0.23%

0.20%
%GW
PWS
>MCL
0.37%
0.00%

0.00%
0.20%
11.11%
0.00%
9.09%

0.00%
0.00%


1.15%
0.00%
0.00%
0.00%
0.00%
50.00%
0.00%
0.00%
0.00%

0.79%


0.24%
0.00%
0.00%
0.40%
0.26%


0.00%
0.25%
0.00%

0.11%
0.00%
0.00%

0.19%

0.17%
%sw
PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%


6.67%
1.71%
0.00%
0.00%
0.00%
100.00%
0.00%
0.00%
0.00%

0.00%


0.00%
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.59%

0.58%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the
The Maximum Contaminant Level (MCL) for Vinyl Chloride is 2 ug/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                   Occurrence of Unregulated Contaminants in Public Water Systems
Table A.62.a URCIS (Round 1) Data- Xylenes (Total) Occurrence in Public Water Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 STATES
TOTAL
UNIQUE
PWS
725
4


3,485
2


220


991

28


3
844
26




298

8



7
2,450


30
413



5


9,539

9,463
GWPWS
587
2


3,459
1


43


952

25


2
798
21




255

7



4
2,323


25
393



4


8,901

8,841
SWPWS
144
2


38
1


187


39

3


1
51
5




44

1



3
127


5
34



1


686

670
% PWS >
MRL
7.03%
100.00%


1 .38%
100.00%


15.91%


6.26%

3.57%


100.00%
1 .54%
100.00%




4.36%

100.00%



14.29%
2.37%


100.00%
0.48%



20.00%


3.75%

3.04%
%GW
PWS>
MRL
5.96%
100.00%


1.19%
100.00%


20.93%


5.99%

4.00%


100.00%
1.13%
100.00%




4.71%

100.00%



25.00%
2.32%


100.00%
0.25%



25.00%


3.13%

2.51%
%sw
PWS>
MRL
12.50%
100.00%


18.42%
100.00%


14.44%


12.82%

33.33%


400.00%
9.80%
20.00%




2.27%

400.00%



0.00%
0.00%


0.00%
0.00%



0.00%


1 1 .95%

10.75%
% PWS
>MCL
0.00%
0.00%


0.00%
0.00%


0.00%


0.00%

0.00%


0.00%
0.00%
0.00%




0.00%

0.00%



0.00%
0.00%


0.00%
0.00%



0.00%


0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%


0.00%
0.00%


0.00%


0.00%

0.00%


0.00%
0.00%
0.00%




0.00%

0.00%



0.00%
0.00%


0.00%
0.00%



0.00%


0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%


0.00%
0.00%


0.00%


0.00%

0.00%


0.00%
0.00%
0.00%




0.00%

0.00%



0.00%
0.00%


0.00%
0.00%



0.00%


0.00%

0.00%
99% VALUE
(M9/L)
4.40
115.90


< 10.00
2.80


24.60


2.80

0.21


120.00
0.10
1210.00




3.10

15.00



5.40
< 0.50


130.00
< 7.50



2.00


1.20

0.63
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type);
MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not
necessarily indicate an MCL violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly
samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Xylenes (Total) is 10,000 |jg/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                           Occurrence of Unregulated Contaminants in Public Water Systems
Table A.62.b URCIS (Round 1) Data- Xylenes (Total) Occurrence in Public Water Systems- Based on Number of Samples
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL
UNIQUE
PWS
725
4


3,485
2


220


991

28


3
844
26




298

8



7
2,450


30
413



5


9,539

9,463
TOTAL #
SAMPLES
2,008
5


10,397
2


291


1,899

94


4
1,786
45




645

9



16
12,857


37
1,255



9


31 ,359

31 ,246
#GW
SAMPLES
1,694
3


10,294
1


62


1,703

76


2
1,306
35




570

8



9
12,451


31
1,144



8


29,397

29,311
#SW
SAMPLES
314
2


103
1


229


196

18


2
480
10




75

1



7
406


6
111



1


1,962

1,935
% TOTAL
SAMPLES
>MRL
4.03%
100.00%


0.67%
100.00%


13.75%


3.84%

2.13%


100.00%
1.06%
100.00%




2.48%

100.00%



18.75%
0.61%


100.00%
0.16%



11.11%


1 .55%

1.24%
%GW
SAMPLES
>MRL
3.48%
100.00%


0.61 %
100.00%


16.13%


3.99%

2.63%


100.00%
0.84%
100.00%




2.63%

100.00%



33.33%
0.59%


100.00%
0.09%



12.50%


1 .31 %

1.04%
%SW
SAMPLES
>MRL
7.01 %
100.00%


6.80%
100.00%


13.10%


2.55%

11.11%


400.00%
2.08%
10.00%




1 .33%

500.00%



85.71%
0.25%


0.00%
0.00%



0.00%


5.15%

4.13%
MIN VALUE
(M9/L)
< 0.00
0.60


< 0.00
1.40


< 0.00


< 0.20

< 0.21


12.00
< 0.02
1.00




< 0.50

0.73



< 0.50
< 0.20


1.80
< 0.20



< 0.50


< 0.00

< 0.00
99% VALUE
(M9/L)
4.40
115.90


< 10.00
2.80


24.60


2.80

0.21


120.00
0.10
1,210.00




3.10

15.00



5.40
< 0.50


130.00
< 7.50



2.00


1.20

0.63
MAX VALUE
(M9/L)
1,340.00
115.90


573.00
2.80


130.00


23.00

0.21


120.00
5.00
1,210.00




107.60

15.00



5.40
290.00


130.00
8.30



2.00


1,340.00

1,340.00
MIN
DETECTS
(M9/L)
0.10
0.60


0.30
1.40


0.01


0.20

0.21


12.00
0.10
1.00




0.54

0.73



4.20
0.50


1.80
3.00



2.00


0.01

0.01
MEDIAN
DETECTS
(M9/L)
1.20
1.63


2.30
2.10


2.87


1.00

0.21


43.00
0.70
6.00




2.25

5.90



4.80
2.25


3.60
5.65



2.00


2.20

1.60
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (f
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
                              Occurrence of Unregulated Contaminants in Public Water Systems
Table A.62.C URCIS (Round 1) Data- Xylenes (Total) Occurrence in Public Water Systems- Based on Number of Systems
STATE
AK
AL
AR
AZ
CA
CO
DC
DE
FL
GA
HI
IA
IL
IN
KY
LA
MA
MD
Ml
MN
MO
MS
MT
NC
NE
NH
NJ
NM
NV
NY
OH
SD
TN
TX
UT
VI
VT
WA
WV
WY

TOTAL

24 States
TOTAL #
SAMPLES
2,008
5


10,397
2


291


1,899

94


4
1,786
45




645

9



16
12,857


37
1,255



9


31,359

31,246
TOTAL
UNIQUE
PWS
725
4


3,485
2


220


991

28


3
844
26




298

8



7
2,450


30
413



5


9,539

9,463
#GW
PWS
587
2


3,459
1


43


952

25


2
798
21




255

7



4
2,323


25
393



4


8,901

8,841
#SW
PWS
144
2


38
1


187


39

3


1
51
5




44

1



3
127


5
34



1


686

670
% PWS
>MRL
7.03%
100.00%


1.38%
100.00%


15.91%


6.26%

3.57%


100.00%
1.54%
100.00%




4.36%

100.00%



14.29%
2.37%


100.00%
0.48%



20.00%


3.75%

3.04%
%GW
PWS
>MRL
5.96%
100.00%


1.19%
100.00%


20.93%


5.99%

4.00%


100.00%
1.13%
100.00%




4.71 %

100.00%



25.00%
2.32%


100.00%
0.25%



25.00%


3.13%

2.51 %
%sw
PWS
>MRL
12.50%
100.00%


18.42%
100.00%


14.44%


12.82%

33.33%


400.00%
9.80%
20.00%




2.27%

400.00%



0.00%
0.00%


0.00%
0.00%



0.00%


11.95%

10.75%
% PWS
> 1/2 MCL
0.00%
0.00%


0.00%
0.00%


0.00%


0.00%

0.00%


0.00%
0.00%
0.00%




0.00%

0.00%



0.00%
0.00%


0.00%
0.00%



0.00%


0.00%

0.00%
%GW
PWS
> 1/2 MCL
0.00%
0.00%


0.00%
0.00%


0.00%


0.00%

0.00%


0.00%
0.00%
0.00%




0.00%

0.00%



0.00%
0.00%


0.00%
0.00%



0.00%


0.00%

0.00%
%sw
PWS
> 1/2 MCL
0.00%
0.00%


0.00%
0.00%


0.00%


0.00%

0.00%


0.00%
0.00%
0.00%




0.00%

0.00%



0.00%
0.00%


0.00%
0.00%



0.00%


0.00%

0.00%
% PWS
>MCL
0.00%
0.00%


0.00%
0.00%


0.00%


0.00%

0.00%


0.00%
0.00%
0.00%




0.00%

0.00%



0.00%
0.00%


0.00%
0.00%



0.00%


0.00%

0.00%
%GW
PWS
>MCL
0.00%
0.00%


0.00%
0.00%


0.00%


0.00%

0.00%


0.00%
0.00%
0.00%




0.00%

0.00%



0.00%
0.00%


0.00%
0.00%



0.00%


0.00%

0.00%
%sw
PWS
>MCL
0.00%
0.00%


0.00%
0.00%


0.00%


0.00%

0.00%


0.00%
0.00%
0.00%




0.00%

0.00%



0.00%
0.00%


0.00%
0.00%



0.00%


0.00%

0.00%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (foi
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL
violation. An MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the
The Maximum Contaminant Level (MCL) for Xylenes (Total) is 10,000 ug/L.
The highlighted States are part of the URCIS 24 State Cross-Section.

-------
       Appendix B.  SDWIS/FED (Round 2) Data Summary

Table B. 1. a   SDWIS/FED (Round 2) Data - Sulfate Occurrence in Public Water Systems
Table B. 1 .b   SDWIS/FED (Round 2) Data - Sulfate Occurrence in Public Water Systems -
             Based on Number of Samples
Table B. 1. c   SDWIS/FED (Round 2) Data - Sulfate Occurrence in Public Water Systems -
             Based on Number of Systems

Table B.2.a   SDWIS/FED (Round 2) Data - Aldicarb Occurrence in Public Water Systems
Table B.2.b   SDWIS/FED (Round 2) Data - Aldicarb Occurrence in Public Water Systems
             - Based on Number of Samples
Table B.2.C   SDWIS/FED (Round 2) Data - Aldicarb Occurrence in Public Water Systems
             - Based on Number of Systems

Table B.3.a   SDWIS/FED (Round 2) Data - Aldicarb Sulfone Occurrence in Public Water
             Systems
Table B.3.b   SDWIS/FED (Round 2) Data - Aldicarb Sulfone Occurrence in Public Water
             Systems - Based on Number of Samples
Table B.3.C   SDWIS/FED (Round 2) Data - Aldicarb Sulfone Occurrence in Public Water
             Systems - Based on Number of Systems

Table B.4.a   SDWIS/FED (Round 2) Data - Aldicarb Sulfoxide Occurrence in Public
             Water Systems
Table B.4.b   SDWIS/FED (Round 2) Data - Aldicarb Sulfoxide Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.4.c   SDWIS/FED (Round 2) Data - Aldicarb Sulfoxide Occurrence in Public
             Water Systems - Based on Number of Systems

Table B. 5. a   SDWIS/FED (Round 2) Data - Aldrin Occurrence in Public Water Systems
Table B. 5 .b   SDWIS/FED (Round 2) Data - Aldrin Occurrence in Public Water Systems -
             Based on Number of Samples
Table B. 5. c   SDWIS/FED (Round 2) Data - Aldrin Occurrence in Public Water Systems -
             Based on Number of Systems

Table B.6.a   SDWIS/FED (Round 2) Data - Butachlor Occurrence in Public Water
             Systems
Table B.6.b   SDWIS/FED (Round 2) Data - Butachlor Occurrence in Public Water
             Systems - Based on Number of Samples
Table B.6.c   SDWIS/FED (Round 2) Data - Butachlor Occurrence in Public Water
             Systems - Based on Number of Systems

-------
Table B.7.a   SDWIS/FED (Round 2) Data - Carbaryl Occurrence in Public Water Systems
Table B.7.b   SDWIS/FED (Round 2) Data - Carbaryl Occurrence in Public Water Systems
             - Based on Number of Samples
Table B.7.c   SDWIS/FED (Round 2) Data - Carbaryl Occurrence in Public Water Systems
             - Based on Number of Systems

Table B. 8. a   SDWIS/FED (Round 2) Data - Dicamba Occurrence in Public Water Systems
Table B. 8 .b   SDWIS/FED (Round 2) Data - Dicamba Occurrence in Public Water Systems
             - Based on Number of Samples
Table B. 8. c   SDWIS/FED (Round 2) Data - Dicamba Occurrence in Public Water Systems
             - Based on Number of Systems

Table B.9.a   SDWIS/FED (Round 2) Data - Dieldrin Occurrence in Public Water Systems
Table B.9.b   SDWIS/FED (Round 2) Data - Dieldrin Occurrence in Public Water Systems -
             Based on Number of Samples
Table B.9.c   SDWIS/FED (Round 2) Data - Dieldrin Occurrence in Public Water Systems -
             Based on Number of Systems

Table B. lO.a  SDWIS/FED (Round 2) Data - 3-Hydroxycarbofuran Occurrence in Public
             Water Systems
Table B. lO.b  SDWIS/FED (Round 2) Data - 3-Hydroxycarbofuran Occurrence in Public
             Water Systems - Based on Number of Samples
Table B. lO.c  SDWIS/FED (Round 2) Data - 3-Hydroxycarbofuran Occurrence in Public
             Water Systems - Based on Number of Systems

Table B. 11. a  SDWIS/FED (Round 2) Data - Methomyl Occurrence in Public Water
             Systems
Table B. 11 .b  SDWIS/FED (Round 2) Data - Methomyl Occurrence in Public Water
             Systems - Based on Number of Samples
Table B. 11. c  SDWIS/FED (Round 2) Data - Methomyl Occurrence in Public Water
             Systems - Based on Number of Systems

Table B. 12.a  SDWIS/FED (Round 2) Data - Metolachlor Occurrence in Public Water
             Systems
Table B. 12.b  SDWIS/FED (Round 2) Data - Metolachlor Occurrence in Public Water
             Systems - Based on Number of Samples
Table B. 12.c  SDWIS/FED (Round 2) Data - Metolachlor Occurrence in Public Water
             Systems - Based on Number of Systems

Table B. 13. a  SDWIS/FED (Round 2) Data - Metribuzin Occurrence in Public Water
             Systems
Table B. 13 .b  SDWIS/FED (Round 2) Data - Metribuzin Occurrence in Public Water
             Systems - Based on Number of Samples
Table B. 13. c  SDWIS/FED (Round 2) Data - Metribuzin Occurrence in Public Water
             Systems - Based on Number of Systems

-------
Table B. 14.a   SDWIS/FED (Round 2) Data - Propachlor Occurrence in Public Water
             Systems
Table B. 14.b   SDWIS/FED (Round 2) Data - Propachlor Occurrence in Public Water
             Systems - Based on Number of Samples
Table B. 14.c   SDWIS/FED (Round 2) Data - Propachlor Occurrence in Public Water
             Systems - Based on Number of Systems

Table B. 15. a   SDWIS/FED (Round 2) Data - Bromobenzene Occurrence in Public Water
             Systems
Table B. 15 .b   SDWIS/FED (Round 2) Data - Bromobenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table B. 15. c   SDWIS/FED (Round 2) Data - Bromobenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table B. 16.a   SDWIS/FED (Round 2) Data - Bromochloromethane Occurrence in Public
             Water Systems
Table B. 16.b   SDWIS/FED (Round 2) Data - Bromochloromethane Occurrence in Public
             Water Systems - Based on Number of Samples
Table B. 16.c   SDWIS/FED (Round 2) Data - Bromochloromethane Occurrence in Public
             Water Systems - Based on Number of Systems

Table B. 17.a   SDWIS/FED (Round 2) Data - Bromodichloromethane Occurrence in Public
             Water Systems
Table B. 17.b   SDWIS/FED (Round 2) Data - Bromodichloromethane Occurrence in Public
             Water Systems - Based on Number of Samples
Table B. 17.c   SDWIS/FED (Round 2) Data - Bromodichloromethane Occurrence in Public
             Water Systems - Based on Number of Systems

Table B. 18. a   SDWIS/FED (Round 2) Data - Bromoform Occurrence in Public Water
             Systems
Table B. 18 .b   SDWIS/FED (Round 2) Data - Bromoform Occurrence in Public Water
             Systems - Based on Number of Samples
Table B. 18. c   SDWIS/FED (Round 2) Data - Bromoform Occurrence in Public Water
             Systems - Based on Number of Systems

Table B. 19.a   SDWIS/FED (Round 2) Data - Bromomethane (Methyl Bromide) Occurrence
             in Public Water Systems
Table B. 19.b   SDWIS/FED (Round 2) Data - Bromomethane (Methyl Bromide) Occurrence
             in Public Water Systems - Based on Number of Samples
Table B. 19.c   SDWIS/FED (Round 2) Data - Bromomethane (Methyl Bromide) Occurrence
             in Public Water Systems - Based on Number of Systems

-------
Table B.20.a  SDWIS/FED (Round 2) Data - Chloroethane Occurrence in Public Water
             Systems
Table B.20.b  SDWIS/FED (Round 2) Data - Chloroethane Occurrence in Public Water
             Systems - Based on Number of Samples
Table B.20.C  SDWIS/FED (Round 2) Data - Chloroethane Occurrence in Public Water
             Systems - Based on Number of Systems

Table B.21 .a  SDWIS/FED (Round 2) Data - Chloroform Occurrence in Public Water
             Systems
Table B.21 .b  SDWIS/FED (Round 2) Data - Chloroform Occurrence in Public Water
             Systems - Based on Number of Samples
Table B.21 .c  SDWIS/FED (Round 2) Data - Chloroform Occurrence in Public Water
             Systems - Based on Number of Systems

Table B.22.a  SDWIS/FED (Round 2) Data - Chloromethane Occurrence in Public Water
             Systems
Table B.22.b  SDWIS/FED (Round 2) Data - Chloromethane Occurrence in Public Water
             Systems - Based on Number of Samples
Table B.22.C  SDWIS/FED (Round 2) Data - Chloromethane Occurrence in Public Water
             Systems - Based on Number of Systems

Table B.23.a  SDWIS/FED (Round 2) Data - Dibromochloromethane Occurrence in Public
             Water Systems
Table B.23.b  SDWIS/FED (Round 2) Data - Dibromochloromethane Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.23.C  SDWIS/FED (Round 2) Data - Dibromochloromethane Occurrence in Public
             Water Systems - Based on Number of Systems

Table B.24.a  SDWIS/FED (Round 2) Data - Dibromomethane Occurrence in Public Water
             Systems
Table B.24.b  SDWIS/FED (Round 2) Data - Dibromomethane Occurrence in Public Water
             Systems - Based on Number of Samples
Table B.24.C  SDWIS/FED (Round 2) Data - Dibromomethane Occurrence in Public Water
             Systems - Based on Number of Systems

Table B.25.a  SDWIS/FED (Round 2) Data - Dichlorodifluoromethane Occurrence in Public
             Water Systems
Table B.25.b  SDWIS/FED (Round 2) Data - Dichlorodifluoromethane Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.25.C  SDWIS/FED (Round 2) Data - Dichlorodifluoromethane Occurrence in Public
             Water Systems - Based on Number of Systems

-------
Table B.26.a  SDWIS/FED (Round 2) Data - 1,1-Dichloroethane Occurrence in Public
             Water Systems
Table B.26.b  SDWIS/FED (Round 2) Data - 1,1-Dichloroethane Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.26.C  SDWIS/FED (Round 2) Data - 1,1-Dichloroethane Occurrence in Public
             Water Systems - Based on Number of Systems

Table B.27.a  SDWIS/FED (Round 2) Data - 1,3-Dichloropropane Occurrence in Public
             Water Systems
Table B.27.b  SDWIS/FED (Round 2) Data - 1,3-Dichloropropane Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.27.C  SDWIS/FED (Round 2) Data - 1,3-Dichloropropane Occurrence in Public
             Water Systems - Based on Number of Systems

Table B.28.a  SDWIS/FED (Round 2) Data - 2,2-Dichloropropane Occurrence in Public
             Water Systems
Table B.28.b  SDWIS/FED (Round 2) Data - 2,2-Dichloropropane Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.28.C  SDWIS/FED (Round 2) Data - 2,2-Dichloropropane Occurrence in Public
             Water Systems - Based on Number of Systems

Table B.29.a  SDWIS/FED (Round 2) Data - 1,1-Dichloropropene Occurrence in Public
             Water Systems
Table B.29.b  SDWIS/FED (Round 2) Data - 1,1-Dichloropropene Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.29.C  SDWIS/FED (Round 2) Data - 1,1-Dichloropropene Occurrence in Public
             Water Systems - Based on Number of Systems

Table B.30.a  SDWIS/FED (Round 2) Data - 1,3- Dichloropropene Occurrence in Public
             Water Systems
Table B.30.b  SDWIS/FED (Round 2) Data - 1,3- Dichloropropene Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.30.C  SDWIS/FED (Round 2) Data - 1,3- Dichloropropene Occurrence in Public
             Water Systems - Based on Number of Systems

Table B.31 .a  SDWIS/FED (Round 2) Data - Hexachlorobutadiene Occurrence in Public
             Water Systems
Table B. 31 .b  SDWIS/FED (Round 2) Data - Hexachlorobutadiene Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.31 .c  SDWIS/FED (Round 2) Data - Hexachlorobutadiene Occurrence in Public
             Water Systems - Based on Number of Systems

-------
Table B.32.a  SDWIS/FED (Round 2) Data - Isopropylbenzene Occurrence in Public Water
             Systems
Table B.32.b  SDWIS/FED (Round 2) Data - Isopropylbenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table B.32.C  SDWIS/FED (Round 2) Data - Isopropylbenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table B.33.a  SDWIS/FED (Round 2) Data - m-Dichlorobenzene Occurrence in Public
             Water Systems
Table B. 3 3 .b  SDWIS/FED (Round 2) Data - m-Dichlorobenzene Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.33.C  SDWIS/FED (Round 2) Data - m-Dichlorobenzene Occurrence in Public
             Water Systems - Based on Number of Systems

Table B.34.a  SDWIS/FED (Round 2) Data - n-Butylbenzene Occurrence in Public Water
             Systems
Table B.34.b  SDWIS/FED (Round 2) Data - n-Butylbenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table B.34.C  SDWIS/FED (Round 2) Data - n-Butylbenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table B. 3 5. a  SDWIS/FED (Round 2) Data - n-Propylbenzene Occurrence in Public Water
             Systems
Table B. 3 5 .b  SDWIS/FED (Round 2) Data - n-Propylbenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table B. 3 5. c  SDWIS/FED (Round 2) Data - n-Propylbenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table B.36.a  SDWIS/FED (Round 2) Data - Naphthalene Occurrence in Public Water
             Systems
Table B.36.b  SDWIS/FED (Round 2) Data - Naphthalene Occurrence in Public Water
             Systems - Based on Number of Samples
Table B.36.C  SDWIS/FED (Round 2) Data - Naphthalene Occurrence in Public Water
             Systems - Based on Number of Systems

Table B.37.a  SDWIS/FED (Round 2) Data - o-Chlorotoluene Occurrence in Public Water
             Systems
Table B.37.b  SDWIS/FED (Round 2) Data - o-Chlorotoluene Occurrence in Public Water
             Systems - Based on Number of Samples
Table B.37.C  SDWIS/FED (Round 2) Data - o-Chlorotoluene Occurrence in Public Water
             Systems - Based on Number of Systems

-------
Table B. 3 8. a  SDWIS/FED (Round 2) Data - p-Chlorotoluene Occurrence in Public Water
             Systems
Table B. 3 8 .b  SDWIS/FED (Round 2) Data - p-Chlorotoluene Occurrence in Public Water
             Systems - Based on Number of Samples
Table B. 3 8. c  SDWIS/FED (Round 2) Data - p-Chlorotoluene Occurrence in Public Water
             Systems - Based on Number of Systems

Table B.39.a  SDWIS/FED (Round 2) Data - p-Isopropyltoluene Occurrence in Public
             Water Systems
Table B.39.b  SDWIS/FED (Round 2) Data - p-Isopropyltoluene Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.39.C  SDWIS/FED (Round 2) Data - p-Isopropyltoluene Occurrence in Public
             Water Systems - Based on Number of Systems

Table B.40.a  SDWIS/FED (Round 2) Data - sec-Butylbenzene Occurrence in Public Water
             Systems
Table B.40.b  SDWIS/FED (Round 2) Data - sec-Butylbenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table B.40.C  SDWIS/FED (Round 2) Data - sec-Butylbenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table B.41 .a  SDWIS/FED (Round 2) Data - tert-Butylbenzene Occurrence in Public Water
             Systems
Table B.41 .b  SDWIS/FED (Round 2) Data - tert-Butylbenzene Occurrence in Public Water
             Systems - Based on Number of Samples
Table B.41 .c  SDWIS/FED (Round 2) Data - tert-Butylbenzene Occurrence in Public Water
             Systems - Based on Number of Systems

Table B.42.a  SDWIS/FED (Round 2) Data - 1,1,1,2-Tetrachloroethane Occurrence in
             Public Water Systems
Table B.42.b  SDWIS/FED (Round 2) Data - 1,1,1,2-Tetrachloroethane Occurrence in
             Public Water Systems - Based on Number of Samples
Table B.42.C  SDWIS/FED (Round 2) Data - 1,1,1,2-Tetrachloroethane Occurrence in
             Public Water Systems - Based on Number of Systems

Table B.43.a  SDWIS/FED (Round 2) Data - 1,1,2,2-Tetrachloroethane Occurrence in
             Public Water Systems
Table B.43.b  SDWIS/FED (Round 2) Data - 1,1,2,2-Tetrachloroethane Occurrence in
             Public Water Systems - Based on Number of Samples
Table B.43.C  SDWIS/FED (Round 2) Data - 1,1,2,2-Tetrachloroethane Occurrence in
             Public Water Systems - Based on Number of Systems

-------
Table B.44.a  SDWIS/FED (Round 2) Data - 1,2,3-Trichlorobenzene Occurrence in Public
             Water Systems
Table B.44.b  SDWIS/FED (Round 2) Data - 1,2,3-Trichlorobenzene Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.44.C  SDWIS/FED (Round 2) Data - 1,2,3-Trichlorobenzene Occurrence in Public
             Water Systems - Based on Number of Systems

Table B.45.a  SDWIS/FED (Round 2) Data - Trichlorofluoromethane Occurrence in Public
             Water Systems
Table B.45.b  SDWIS/FED (Round 2) Data - Trichlorofluoromethane Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.45.C  SDWIS/FED (Round 2) Data - Trichlorofluoromethane Occurrence in Public
             Water Systems - Based on Number of Systems

Table B.46.a  SDWIS/FED (Round 2) Data - 1,2,3-Trichloropropane Occurrence in Public
             Water Systems
Table B.46.b  SDWIS/FED (Round 2) Data - 1,2,3-Trichloropropane Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.46.C  SDWIS/FED (Round 2) Data - 1,2,3-Trichloropropane Occurrence in Public
             Water Systems - Based on Number of Systems

Table B.47.a  SDWIS/FED (Round 2) Data - 1,2,4-Trimethylbenzene Occurrence in Public
             Water Systems
Table B.47.b  SDWIS/FED (Round 2) Data - 1,2,4-Trimethylbenzene Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.47.C  SDWIS/FED (Round 2) Data - 1,2,4-Trimethylbenzene Occurrence in Public
             Water Systems - Based on Number of Systems

Table B.48.a  SDWIS/FED (Round 2) Data - 1,3,5-Trimethylbenzene Occurrence in Public
             Water Systems
Table B.48.b  SDWIS/FED (Round 2) Data - 1,3,5-Trimethylbenzene Occurrence in Public
             Water Systems - Based on Number of Samples
Table B.48.C  SDWIS/FED (Round 2) Data - 1,3,5-Trimethylbenzene Occurrence in Public
             Water Systems - Based on Number of Systems

-------
                                   Occurrence of Unregulated Contaminants in Public Water Systems
Table B.1 .a SDWIS/FED (Round 2) Data- Sulfate Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL
UNIQUE PWS
7

238
481



83

46

69
592

3,058
1,401
1,244
1,121
511

645

268
2,100
848

927

569

75
4,479
64
753


19,579

16,495
# GW PWS
7

181
380



42

22

54
538

2,952
1,371
1,141
1,116
498

616

256
1,931
605

668

537

29
3,943
44
702


17,633

15,009
# SW PWS
0

57
101



41

24

15
54

106
30
103
5
13

29

12
169
243

259

32

46
536
20
51


1,946

1,486
% PWS
>MRL
100.00%

90.34%
88.57%



96.39%

100.00%

100.00%
93.41%

94.05%
84.94%
91.96%
78.77%
4.50%

99.22%

94.40%
94.81%
69.22%

95.25%

0.00%

92.00%
93.44%
92.19%
73.17%


85.45%

88.11%
% GW PWS
>MRL
100.00%

92.27%
85.79%



95.24%

100.00%

100.00%
92.75%

93.94%
84.68%
91.24%
78.94%
4.62%

99.19%

94.53%
94.41%
71.07%

94.91%

0.00%

89.66%
92.77%
95.45%
72.51%


84.89%

87.76%
% SW PWS
>MRL
0.00%

84.21%
99.01%



97.56%

100.00%

100.00%
100.00%

97.17%
96.67%
100.00%
40.00%
0.00%

100.00%

91.67%
99.41%
64.61%

96.14%

0.00%

93.48%
98.32%
85.00%
82.35%


90.49%

91.66%
% PWS
>HRL
0.00%

0.00%
0.00%



1.20%

2.17%

0.00%
0.00%

1.54%
3.57%
0.16%
0.09%
1.57%

0.00%

4.10%
5.24%
1.42%

0.43%

0.00%

0.00%
1.21%
0.00%
0.00%


1.54%

1.79%
% GW PWS
>HRL
0.00%

0.00%
0.00%



2.38%

0.00%

0.00%
0.00%

1.59%
3.65%
0.09%
0.09%
1.61%

0.00%

4.30%
5.54%
1.16%

0.30%

0.00%

0.00%
1.09%
0.00%
0.00%


1.58%

1.83%
% SW PWS
>HRL
0.00%

0.00%
0.00%



0.00%

4.17%

0.00%
0.00%

0.00%
0.00%
0.97%
0.00%
0.00%

0.00%

0.00%
1.78%
2.06%

0.77%

0.00%

0.00%
2.05%
0.00%
0.00%


1.18%

1.41%
99% VALUE
(M9/L)
190000.00

75000.00
68600.00



94000.00

220000.00

65900.00
140000.00

509000.00
770000.00
205000.00
55700.00
709000.00

69000.00

858000.00
20000.00
386000.00

203000.00

5.00

86000.00
486000.00
35900.00
13000.00


510000.00

560000.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory
analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Sulfate is 500,000 |jg/L.  This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                             Occurrence of Unregulated Contaminants in Public Water Systems
Table B.1.b SDWIS/FED (Round 2) Data- Sulfate Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL
UNIQUE PWS
7

238
481



83

46

69
592

3,058
1,401
1,244
1,121
511

645

268
2,100
848

927

569

75
4,479
64
753


19,579

16,495
TOTAL #
SAMPLES
7

396
992



818

223

120
790

17,165
2,430
2,391
3,139
581

685

558
3,154
1,786

1,583

1,189

253
7,642
118
1,967


47,987

40,484
#GW
SAMPLES
7

268
663



252

113

81
658

16,310
2,383
2,052
3,108
564

644

536
2,820
1,328

1,055

1,080

57
5,800
75
1,696


41 ,550

35,648
#SW
SAMPLES
0

128
329



566

110

39
132

855
47
339
31
17

41

22
334
458

528

109

196
1,842
43
271


6,437

4,836
% TOTAL
SAMPLES
>MRL
100.00%

88.89%
86.59%



92.79%

87.44%

100.00%
92.66%

90.01 %
82.55%
90.84%
62.15%
4.82%

99.12%

93.37%
95.12%
61 .48%

95.20%

0.00%

77.47%
92.41 %
77.12%
65.84%


83.52%

86.99%
%GW
SAMPLES
>MRL
100.00%

89.93%
81 .00%



98.41 %

80.53%

100.00%
92.55%

89.91 %
82.29%
89.52%
62.48%
4.96%

99.07%

93.66%
94.68%
64.31 %

94.31 %

0.00%

77.19%
90.97%
78.67%
67.92%


82.88%

86.68%
%SW
SAMPLES
>MRL
0.00%

86.72%
97.87%



90.28%

94.55%

100.00%
93.18%

91 .81 %
95.74%
98.82%
29.03%
0.00%

100.00%

86.36%
98.80%
53.28%

96.97%

0.00%

77.55%
96.96%
74.42%
52.77%


87.67%

89.25%
MIN VALUE
(M9/L)
10800.00

< 0.00
< 0.00



< 0.00

< 22.00

1.00
< 200.00

< 0.00
< 0.00
< 5000.00
< 2.80
< 0.00

< 1000.00

< 2000.00
< 100.00
< 0.00

< 0.00

< 0.00

< 0.00
< 1000.00
< 100.00
< 0.00


< 0.00

< 0.00
99% VALUE
(M9/L)
190000.00

75000.00
68600.00



94000.00

220000.00

65900.00
140000.00

509000.00
770000.00
205000.00
55700.00
709000.00

69000.00

858000.00
20000.00
386000.00

203000.00

< 5.00

86000.00
486000.00
35900.00
13000.00


510000.00

560000.00
MAX VALUE
(M9/L)
190000.00

330400.00
161900.00



1130000.00

1100000.00

240000.00
340000.00

995000.00
1500000.00
583000.00
5074000.00
929000.00

355000.00

2437000.00
5454000.00
2176000.00

836000.00

< 5.00

170000.00
2040000.00
74600.00
98600.00


5454000.00

5454000.00
MIN
DETECTS
(M9/L)
10800.00

282.00
1200.00



1.00

51.00

1.00
2000.00

3000.00
5000.00
5010.00
2.80
1000.00

1000.00

2000.00
335.00
12300.00

10.00



1000.00
1000.00
2360.00
100.00


1.00

1.00
MEDIAN
DETECTS
(M9/L)
39700.00

8595.00
9300.00



14000.00

13100.00

16150.00
10000.00

31000.00
27000.00
20100.00
8200.00
150000.00

12000.00

47000.00
64000.00
49850.00

21000.00



19000.00
34000.00
9700.00
1500.00


26000.00

30000.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                 Occurrence of Unregulated Contaminants in Public Water Systems
Table B.1 .c  SDWIS/FED (Round 2) Data- Sulfate Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL #
SAMPLES
7

396
992



818

223

120
790

17,165
2,430
2,391
3,139
581

685

558
3,154
1,786

1,583

1,189

253
7,642
118
1,967


47,987

40,484
TOTAL
UNIQUE PWS
7

238
481



83

46

69
592

3,058
1,401
1,244
1,121
511

645

268
2,100
848

927

569

75
4,479
64
753


19,579

16,495
# GW PWS
7

181
380



42

22

54
538

2,952
1,371
1,141
1,116
498

616

256
1,931
605

668

537

29
3,943
44
702


17,633

15,009
# SW PWS
0

57
101



41

24

15
54

106
30
103
5
13

29

12
169
243

259

32

46
536
20
51


1,946

1,486
% PWS
>MRL
100.00%

90.34%
88.57%



96.39%

100.00%

100.00%
93.41%

94.05%
84.94%
91.96%
78.77%
4.50%

99.22%

94.40%
94.81%
69.22%

95.25%

0.00%

92.00%
93.44%
92.19%
73.17%


85.45%

88.11%
% GW PWS
>MRL
100.00%

92.27%
85.79%



95.24%

100.00%

100.00%
92.75%

93.94%
84.68%
91.24%
78.94%
4.62%

99.19%

94.53%
94.41%
71.07%

94.91%

0.00%

89.66%
92.77%
95.45%
72.51%


84.89%

87.76%
% SW PWS
>MRL
0.00%

84.21%
99.01%



97.56%

100.00%

100.00%
100.00%

97.17%
96.67%
100.00%
40.00%
0.00%

100.00%

91.67%
99.41%
64.61%

96.14%

0.00%

93.48%
98.32%
85.00%
82.35%

% PWS
> 1/2 HRL
0.00%

0.42%
0.00%



1.20%

4.35%

0.00%
0.51%

3.37%
7.57%
0.88%
0.09%
2.15%

0.31%

10.45%
11.05%
5.19%

0.86%

0.00%

0.00%
6.18%
0.00%
0.00%


90.49%
4.24%

91.66%
4.97%
% GW PWS
> 1/2 HRL
0.00%

0.00%
0.00%



2.38%

4.55%

0.00%
0.19%

3.39%
7.73%
0.88%
0.09%
2.21%

0.32%

9.77%
11.34%
5.12%

0.45%

0.00%

0.00%
4.72%
0.00%
0.00%


3.95%

4.61%
% SW PWS
> 1/2 HRL
0.00%

1.75%
0.00%



0.00%

4.17%

0.00%
3.70%

2.83%
0.00%
0.97%
0.00%
0.00%

0.00%

25.00%
7.69%
5.35%

1.93%

0.00%

0.00%
16.98%
0.00%
0.00%


6.83%

8.55%
% PWS
>HRL
0.00%

0.00%
0.00%



1.20%

2.17%

0.00%
0.00%

1.54%
3.57%
0.16%
0.09%
1.57%

0.00%

4.10%
5.24%
1.42%

0.43%

0.00%

0.00%
1.21%
0.00%
0.00%


1.54%

1.79%
% GW PWS
>HRL
0.00%

0.00%
0.00%



2.38%

0.00%

0.00%
0.00%

1.59%
3.65%
0.09%
0.09%
1.61%

0.00%

4.30%
5.54%
1.16%

0.30%

0.00%

0.00%
1.09%
0.00%
0.00%


1.58%

1.83%
% SW PWS
>HRL
0.00%

0.00%
0.00%



0.00%

4.17%

0.00%
0.00%

0.00%
0.00%
0.97%
0.00%
0.00%

0.00%

0.00%
1.78%
2.06%

0.77%

0.00%

0.00%
2.05%
0.00%
0.00%


1.18%

1.41%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)

"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Sulfate is 500,000 ug/L. This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                    Occurrence of Unregulated Contaminants in Public Water Systems
Table B.2.a SDWIS/FED (Round 2) Data- Aldicarb Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
24
32

527


749
75

38
1,363
48


2,633
1,270
374
12
499
5
591

713
1,012
128
1,153
490

952

14
1,916
430
332


15,380

12,020

11,972
# GW PWS
23
24

431


538
38

19
1,295
26


2,553
1,240
276
11
470
4
558

684
864
100
1,000
342

852

3
1,467
377
281


13,476

10,535

10,509
# SW PWS
1
8

96


211
37

19
68
22


80
30
98
1
29
1
33

29
148
28
153
148

100

11
449
53
51


1,904

1,485

1,463
% PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
18.75%


0.00%
0.00%
0.27%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
5.92%

0.00%

0.00%
0.00%
0.00%
0.00%


0.25%

0.08%

0.01%
% GW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
19.23%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.88%

0.00%

0.00%
0.00%
0.00%
0.00%


0.06%

0.05%

0.00%
% SW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
18.18%


0.00%
0.00%
1.02%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
17.57%

0.00%

0.00%
0.00%
0.00%
0.00%


1.63%

0.34%

0.07%
% PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
1.22%

0.00%

0.00%
0.00%
0.00%
0.00%


0.04%

0.00%

0.00%
% GW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.29%

0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% SW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
3.38%

0.00%

0.00%
0.00%
0.00%
0.00%


0.26%

0.00%

0.00%
99% VALUE
(M9/L)
< 5.00
< 0.00

< 0.00


< 0.00
< 0.00

< 2.00
< 0.35
4.40


< 0.00
< 0.00
< 1.50
< 0.00
< 0.00
< 0.50
< 0.00

< 1.20
< 1.00
< 0.00
< 0.00
3.00

< 0.00

< 0.00
< 3.00
< 0.50
< 0.10


< 3.00

< 3.00

< 3.00
1.  Massachusetts data not included in "19 States" summary statistics for Aldicarb.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory
analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Aldicarb is 7 |jg/L.  This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                              Occurrence of Unregulated Contaminants in Public Water Systems
Table B.2.b SDWIS/FED (Round 2) Data- Aldicarb Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
24
32

527


749
75

38
1,363
48


2,633
1,270
374
12
499
5
591

713
1,012
128
1,153
490

952

14
1,916
430
332


15,380

12,020

11,972
TOTAL #
SAMPLES
33
68

1,762


2,214
330

191
3,333
143


4,006
5,910
1,039
29
738
5
612

4,138
1,269
165
2,673
1,937

5,712

56
4,879
734
752


42,728

30,564

30,421
#GW
SAMPLES
32
55

1,494


1,360
128

77
3,152
61


3,715
5,678
404
25
698
4
577

3,955
1,043
133
2,096
1,196

4,662

17
2,597
575
595


34,329

24,542

24,481
#SW
SAMPLES
1
13

268


854
202

114
181
82


291
232
635
4
40
1
35

183
226
32
577
741

1,050

39
2,282
159
157


8,399

6,022

5,940
% TOTAL
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
16.08%


0.00%
0.00%
0.10%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
2.68%

0.00%

0.00%
0.00%
0.00%
0.00%


0.18%

0.08%

0.00%
%GW
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
19.67%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.25%

0.00%

0.00%
0.00%
0.00%
0.00%


0.04%

0.05%

0.00%
%sw
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
13.41%


0.00%
0.00%
0.16%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
6.61%

0.00%

0.00%
0.00%
0.00%
0.00%


0.73%

0.20%

0.02%
MIN VALUE
(H9/L)
< 0.50
< 0.00

< 0.00


< 0.00
< 0.00

< 0.30
< 0.35
< 0.20


< 0.00
< 0.00
< 1.50
< 0.00
< 0.00
< 0.50
< 0.00

< 0.00
< 0.05
< 0.00
< 0.00
< 0.00

< 0.00

< 0.00
< 3.00
< 0.00
< 0.00


< 0.00

< 0.00

< 0.00
99% VALUE
(H9/L)
< 5.00
< 0.00

< 0.00


< 0.00
< 0.00

< 2.00
< 0.35
4.40


< 0.00
< 0.00
< 1.50
< 0.00
< 0.00
< 0.50
< 0.00

< 1.20
< 1.00
< 0.00
< 0.00
3.00

< 0.00

< 0.00
< 3.00
< 0.50
< 0.10


< 3.00

< 3.00

< 3.00
MAX VALUE
(H9/L)
< 5.00
< 0.00

< 0.00


< 0.00
< 0.00

< 2.00
< 0.35
4.40


< 0.00
< 0.00
1.50
< 0.00
< 0.00
< 0.50
< 0.00

< 11.00
< 1.50
< 0.00
< 0.00
1000.00

< 0.00

< 0.00
< 3.00
< 1.00
< 0.30


1000.00

4.40

1.50
MIN
DETECTS
(M9/L)











4.40




1.50









0.50









0.50

1.50

1.50
MEDIAN
DETECTS
(M9/L)











4.40




1.50









2.00









3.00

4.40

1.50
1.  Massachusetts data not included in "19 States" summary statistics for Aldicarb.
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                     Occurrence of Unregulated Contaminants in Public Water Systems
Table B.2.C SDWIS/FED (Round 2) Data-Aldicarb Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL #
SAMPLES
33
68

1,762


2,214
330

191
3,333
143


4,006
5,910
1,039
29
738
5
612

4,138
1,269
165
2,673
1,937

5,712

56
4,879
734
752


42,728

30,564

30,421
TOTAL
UNIQUE PWS
24
32

527


749
75

38
1,363
48


2,633
1,270
374
12
499
5
591

713
1,012
128
1,153
490

952

14
1,916
430
332


15,380

12,020

11,972
3GWPWS
23
24

431


538
38

19
1,295
26


2,553
1,240
276
11
470
4
558

684
864
100
1,000
342

852

3
1,467
377
281


13,476

10,535

10,509
3SWPWS
1
8

96


211
37

19
68
22


80
30
98
1
29
1
33

29
148
28
153
148

100

11
449
53
51


1,904

1,485

1,463
%PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
18.75%


0.00%
0.00%
0.27%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
5.92%

0.00%

0.00%
0.00%
0.00%
0.00%


0.25%

0.08%

0.01%
% GW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
1 9.23%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.88%

0.00%

0.00%
0.00%
0.00%
0.00%


0.06%

0.05%

0.00%
% SW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
18.18%


0.00%
0.00%
1.02%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
17.57%

0.00%

0.00%
0.00%
0.00%
0.00%

% PWS
> 1/2 HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
1 8.75%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
1 .43%

0.00%

0.00%
0.00%
0.00%
0.00%


1.63% | 0.10%

0.34%

0.07%
0.07%

0.00%
% GW PWS
> 1/2 HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
19.23%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.29%

0.00%

0.00%
0.00%
0.00%
0.00%


0.04%

0.05%

0.00%
% SW PWS
> 1/2 HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
18.18%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
4.05%

0.00%

0.00%
0.00%
0.00%
0.00%


0.53%

0.27%

0.00%
%PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
1.22%

0.00%

0.00%
0.00%
0.00%
0.00%


0.04%

0.00%

0.00%
% GW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.29%

0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% SW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
3.38%

0.00%

0.00%
0.00%
0.00%
0.00%


0.26%

0.00%

0.00%
1.  Massachusetts data not included in "19 States" summary statistics for Aldicarb.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of  systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Aldicarb is 7 |jg/L.  This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                    Occurrence of Unregulated Contaminants in Public Water Systems
Table B.3.a SDWIS/FED (Round 2) Data- Aldicarb Sulfone Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
25
33
1
527


749
74

36
1,363
42


2,633
1,270
374
11
493
5
591

716
1,012
128
1,153
581

952

13
1,915
433
333


15,463

12,010

11,968
# GW PWS
24
25
0
431


538
38

18
1,295
22


2,553
1,240
276
10
468
4
558

687
866
100
1,000
382

852

3
1,466
379
282


13,517

10,534

10,512
# SW PWS
1
8
1
96


211
36

18
68
20


80
30
98
1
25
1
33

29
146
28
153
199

100

10
449
54
51


1,946

1,476

1,456
% PWS
>MRL
0.00%
0.00%
0.00%
0.00%


0.13%
0.00%

0.00%
0.00%
21.43%


0.00%
0.16%
1.60%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
9.12%

0.00%

0.00%
0.00%
0.00%
0.30%


0.47%

0.16%

0.08%
% GW PWS
>MRL
0.00%
0.00%
0.00%
0.00%


0.19%
0.00%

0.00%
0.00%
22.73%


0.00%
0.16%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
3.14%

0.00%

0.00%
0.00%
0.00%
0.35%


0.16%

0.09%

0.04%
% SW PWS
>MRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%
0.00%
20.00%


0.00%
0.00%
6.12%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
20.60%

0.00%

0.00%
0.00%
0.00%
0.00%


2.62%

0.68%

0.41%
% PWS
>HRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.34%

0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% GW PWS
>HRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.52%

0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% SW PWS
>HRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
99% VALUE
(M9/L)
< 5.00
< 0.00
< 0.00
< 0.00


< 0.00
< 0.00

< 2.00
< 0.13
0.30


< 0.00
< 0.00
< 1.00
< 0.00
< 0.00
< 0.50
< 0.00

< 1.00
< 1.00
< 0.00
< 0.00
2.00

< 0.00

< 0.00
< 2.00
< 0.40
< 0.00


< 2.00

< 2.00

< 2.00
1.  Massachusetts data not included in "19 States" summary statistics for Aldicarb Sulfone.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory
analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Aldicarb Sulfone is 7 |jg/L. This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                 Occurrence of Unregulated Contaminants in Public Water Systems
Table B.S.b SDWIS/FED (Round 2) Data- Aldicarb Sulfone Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
25
33
1
527


749
74

36
1,363
42


2,633
1,270
374
11
493
5
591

716
1,012
128
1,153
581

952

13
1,915
433
333


15,463

12,010

11,968
TOTAL #
SAMPLES
34
69
1
1,762


2,220
330

149
3,333
139


4,006
5,910
1,039
26
728
5
612

4,138
1,263
165
2,672
2,666

5,715

54
4,868
742
753


43,399

30,498

30,359
#GW
SAMPLES
33
56
0
1,494


1,362
129

70
3,152
56


3,715
5,678
404
23
692
4
577

3,955
1,040
133
2,096
1,405

4,665

17
2,588
577
596


34,517

24,516

24,460
#SW
SAMPLES
1
13
1
268


858
201

79
181
83


291
232
635
3
36
1
35

183
223
32
576
1,261

1,050

37
2,280
165
157


8,882

5,982

5,899
% TOTAL
SAMPLES
>MRL
0.00%
0.00%
0.00%
0.00%


0.05%
0.00%

0.00%
0.00%
17.27%


0.00%
0.03%
0.58%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
4.20%

0.00%

0.00%
0.00%
0.00%
0.13%


0.34%

0.11%

0.03%
%GW
SAMPLES
>MRL
0.00%
0.00%
0.00%
0.00%


0.07%
0.00%

0.00%
0.00%
23.21%


0.00%
0.04%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
1.07%

0.00%

0.00%
0.00%
0.00%
0.17%


0.09%

0.07%

0.02%
%sw
SAMPLES
>MRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%
0.00%
13.25%


0.00%
0.00%
0.94%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
7.69%

0.00%

0.00%
0.00%
0.00%
0.00%


1.28%

0.28%

0.10%
MIN VALUE
(H9/L)
< 0.40
< 0.00
< 0.00
< 0.00


< 0.00
< 0.00

< 0.25
< 0.13
< 0.20


< 0.00
< 0.00
< 0.51
< 0.00
< 0.00
< 0.50
< 0.00

< 0.00
< 0.10
< 0.00
< 0.00
< 0.00

< 0.00

< 0.00
< 2.00
< 0.00
< 0.00


< 0.00

< 0.00

< 0.00
99% VALUE
(H9/L)
< 5.00
< 0.00
< 0.00
< 0.00


< 0.00
< 0.00

< 2.00
< 0.13
0.30


< 0.00
< 0.00
< 1.00
< 0.00
< 0.00
< 0.50
< 0.00

< 1.00
< 1.00
< 0.00
< 0.00
2.00

< 0.00

< 0.00
< 2.00
< 0.40
< 0.00


< 2.00

< 2.00

< 2.00
MAX VALUE
(H9/L)
< 5.00
< 0.00
< 0.00
< 0.00


0.40
< 0.00

< 2.00
< 0.13
0.30


< 0.00
0.74
1.14
< 0.00
< 0.00
< 0.50
< 0.00

< 11.00
< 1.00
< 0.00
< 0.00
1100.00

< 0.00

< 0.00
< 2.00
< 0.80
0.10


1100.00

1.14

1.14
MIN
DETECTS
(M9/L)






0.40




0.30



0.70
0.51









0.40






0.10


0.10

0.10

0.10
MEDIAN
DETECTS
(M9/L)






0.40




0.30



0.72
0.76









0.50






0.10


0.50

0.30

0.68
1.  Massachusetts data not included in "19 States" summary statistics for Aldicarb Sulfone.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                     Occurrence of Unregulated Contaminants in Public Water Systems
Table B.3.C SDWIS/FED (Round 2) Data- Aldicarb Sulfone Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL #
SAMPLES
34
69
1
1,762


2,220
330

149
3,333
139


4,006
5,910
1,039
26
728
5
612

4,138
1,263
165
2,672
2,666

5,715

54
4,868
742
753


43,399

30,498

30,359
TOTAL
UNIQUE PWS
25
33
1
527


749
74

36
1,363
42


2,633
1,270
374
11
493
5
591

716
1,012
128
1,153
581

952

13
1,915
433
333


15,463

12,010

11,968
3GWPWS
24
25
0
431


538
38

18
1,295
22


2,553
1,240
276
10
468
4
558

687
866
100
1,000
382

852

3
1,466
379
282


13,517

10,534

10,512
3SWPWS
1
8
1
96


211
36

18
68
20


80
30
98
1
25
1
33

29
146
28
153
199

100

10
449
54
51


1,946

1,476

1,456
%PWS
>MRL
0.00%
0.00%
0.00%
0.00%


0.13%
0.00%

0.00%
0.00%
21.43%


0.00%
0.16%
1.60%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
9.12%

0.00%

0.00%
0.00%
0.00%
0.30%


0.47%

0.16%

0.08%
% GW PWS
>MRL
0.00%
0.00%
0.00%
0.00%


0.19%
0.00%

0.00%
0.00%
22.73%


0.00%
0.16%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
3.14%

0.00%

0.00%
0.00%
0.00%
0.35%


0.16%

0.09%

0.04%
% SW PWS
>MRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%
0.00%
20.00%


0.00%
0.00%
6.12%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
20.60%

0.00%

0.00%
0.00%
0.00%
0.00%

% PWS
> 1/2 HRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.69%

0.00%

0.00%
0.00%
0.00%
0.00%


2.62%| 0.03%

0.68%

0.41%
0.00%

0.00%
% GW PWS
> 1/2 HRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.52%

0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% SW PWS
> 1/2 HRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
1.01%

0.00%

0.00%
0.00%
0.00%
0.00%


0.10%

0.00%

0.00%
%PWS
>HRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.34%

0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% GW PWS
>HRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.52%

0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% SW PWS
>HRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
1.  Massachusetts data not included in "19 States" summary statistics for Aldicarb Sulfone.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Aldicarb Sulfone is 7 |jg/L. This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                    Occurrence of Unregulated Contaminants in Public Water Systems
Table B.4.a SDWIS/FED (Round 2) Data- Aldicarb Sulfoxide Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
25
33

527


749
75

34
1,363
43


2,633
1,270
374
12
482
5
592

715
1,013
128
1,153
580

952

13
1,913
432
333


15,449

11,997

11,954
# GW PWS
24
25

431


538
38

18
1,295
23


2,553
1,240
276
11
457
4
559

686
867
100
1,000
381

852

3
1,464
378
282


13,505

10,523

10,500
# SW PWS
1
8

96


211
37

16
68
20


80
30
98
1
25
1
33

29
146
28
153
199

100

10
449
54
51


1,944

1,474

1,454
% PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
20.93%


0.04%
0.00%
1.87%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.09%
8.97%

0.00%

0.00%
0.00%
0.00%
0.30%


0.46%

0.16%

0.08%
% GW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
21.74%


0.04%
0.00%
0.36%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
2.36%

0.00%

0.00%
0.00%
0.00%
0.35%


0.13%

0.08%

0.03%
% SW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
20.00%


0.00%
0.00%
6.12%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.65%
21.61%

0.00%

0.00%
0.00%
0.00%
0.00%


2.78%

0.75%

0.48%
% PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.09%
0.86%

0.00%

0.00%
0.00%
0.00%
0.00%


0.04%

0.01%

0.01%
% GW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.10%
0.52%

0.00%

0.00%
0.00%
0.00%
0.00%


0.02%

0.01%

0.01%
% SW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
1.51%

0.00%

0.00%
0.00%
0.00%
0.00%


0.15%

0.00%

0.00%
99% VALUE
(M9/L)
< 5.00
< 0.00

< 0.00


< 0.00
< 0.00

< 2.00
< 0.25
4.40


< 0.00
< 0.00
< 2.00
< 0.00
< 0.00
< 0.50
< 0.00

< 0.80
< 1.00
< 0.00
< 0.00
2.00

< 0.00

< 0.00
< 4.00
< 0.44
< 0.10


< 4.00

< 4.00

< 4.00
1.  Massachusetts data not included in "19 States" summary statistics for Aldicarb Sulfoxide.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory
analyses)
The Health Reference Level (HRL) is the estimated  health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Aldicarb Sulfoxide is 7 |jg/L.  This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                 Occurrence of Unregulated Contaminants in Public Water Systems
Table B.4.b SDWIS/FED (Round 2) Data- Aldicarb Sulfoxide Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
25
33

527


749
75

34
1,363
43


2,633
1,270
374
12
482
5
592

715
1,013
128
1,153
580

952

13
1,913
432
333


15,449

11,997

11,954
TOTAL #
SAMPLES
34
69

1,762


2,220
331

139
3,333
139


4,004
5,910
1,039
28
716
5
613

4,134
1,266
165
2,670
2,658

5,723

54
4,863
738
753


43,366

30,467

30,328
#GW
SAMPLES
33
56

1,494


1,362
129

70
3,152
57


3,713
5,678
404
24
680
4
578

3,951
1,043
133
2,094
1,397

4,674

17
2,584
575
596


34,498

24,497

24,440
#SW
SAMPLES
1
13

268


858
202

69
181
82


291
232
635
4
36
1
35

183
223
32
576
1,261

1,049

37
2,279
163
157


8,868

5,970

5,888
% TOTAL
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
17.27%


0.02%
0.00%
0.77%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.04%
4.25%

0.00%

0.00%
0.00%
0.00%
0.13%


0.34%

0.11%

0.04%
%GW
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
22.81%


0.03%
0.00%
0.25%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.86%

0.00%

0.00%
0.00%
0.00%
0.17%


0.08%

0.07%

0.01%
%sw
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
13.41%


0.00%
0.00%
1.10%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.17%
8.01%

0.00%

0.00%
0.00%
0.00%
0.00%


1.35%

0.32%

0.14%
MIN VALUE
(H9/L)
< 0.50
< 0.00

< 0.00


< 0.00
< 0.00

< 0.27
< 0.25
< 0.20


< 0.00
< 0.00
< 0.41
< 0.00
< 0.00
< 0.50
< 0.00

< 0.15
< 0.20
< 0.00
< 0.00
< 0.00

< 0.00

< 0.00
< 4.00
< 0.00
< 0.00


< 0.00

< 0.00

< 0.00
99% VALUE
(H9/L)
< 5.00
< 0.00

< 0.00


< 0.00
< 0.00

< 2.00
< 0.25
4.40


< 0.00
< 0.00
< 2.00
< 0.00
< 0.00
< 0.50
< 0.00

< 0.80
< 1.00
< 0.00
< 0.00
2.00

< 0.00

< 0.00
< 4.00
< 0.44
< 0.10


< 4.00

< 4.00

< 4.00
MAX VALUE
(H9/L)
0.00
< 0.00

< 0.00


< 0.00
< 0.00

< 2.00
< 0.25
4.40


1.90
< 0.00
2.30
< 0.00
< 0.00
< 0.50
< 0.00

< 11.00
< 2.00
< 0.00
8.80
9000.00

< 0.01

< 0.00
< 4.00
< 1.00
0.40


9000.00

8.80

8.80
MIN
DETECTS
(M9/L)











4.40


1.90

0.41








8.80
0.50






0.40


0.40

0.40

0.40
MEDIAN
DETECTS
(M9/L)











4.40


1.90

0.78








8.80
0.90






0.40


2.00

4.40

0.85
1.  Massachusetts data not included in "19 States" summary statistics for Aldicarb Sulfoxide.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the  SDWIS/FED 20 State Cross-Section.

-------
                                                     Occurrence of Unregulated Contaminants in Public Water Systems
Table B.4.C SDWIS/FED (Round 2) Data-Aldicarb Sulfoxide Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL #
SAMPLES
34
69

1,762


2,220
331

139
3,333
139


4,004
5,910
1,039
28
716
5
613

4,134
1,266
165
2,670
2,658

5,723

54
4,863
738
753


43,366

30,467

30,328
TOTAL
UNIQUE PWS
25
33

527


749
75

34
1,363
43


2,633
1,270
374
12
482
5
592

715
1,013
128
1,153
580

952

13
1,913
432
333


15,449

11,997

11,954
3GWPWS
24
25

431


538
38

18
1,295
23


2,553
1,240
276
11
457
4
559

686
867
100
1,000
381

852

3
1,464
378
282


13,505

10,523

10,500
3SWPWS
1
8

96


211
37

16
68
20


80
30
98
1
25
1
33

29
146
28
153
199

100

10
449
54
51


1,944

1,474

1,454
%PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
20.93%


0.04%
0.00%
1.87%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.09%
8.97%

0.00%

0.00%
0.00%
0.00%
0.30%


0.46%

0.16%

0.08%
% GW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
21.74%


0.04%
0.00%
0.36%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
2.36%

0.00%

0.00%
0.00%
0.00%
0.35%


0.13%

0.08%

0.03%
% SW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
20.00%


0.00%
0.00%
6.12%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.65%
21.61%

0.00%

0.00%
0.00%
0.00%
0.00%

% PWS
> 1/2 HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
20.93%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.09%
1 .55%

0.00%

0.00%
0.00%
0.00%
0.00%


2.78%| 0.12%

0.75%

0.48%
0.08%

0.01%
% GW PWS
> 1/2 HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
21.74%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.52%

0.00%

0.00%
0.00%
0.00%
0.00%


0.05%

0.05%

0.00%
% SW PWS
> 1/2 HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
20.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.65%
3.52%

0.00%

0.00%
0.00%
0.00%
0.00%


0.62%

0.34%

0.07%
%PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.09%
0.86%

0.00%

0.00%
0.00%
0.00%
0.00%


0.04%

0.01%

0.01%
% GW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.10%
0.52%

0.00%

0.00%
0.00%
0.00%
0.00%


0.02%

0.01%

0.01%
% SW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%


0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
1.51%

0.00%

0.00%
0.00%
0.00%
0.00%


0.15%

0.00%

0.00%
1.  Massachusetts data not included in "19 States" summary statistics for Aldicarb Sulfoxide.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Aldicarb Sulfoxide is 7 |jg/L. This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                    Occurrence of Unregulated Contaminants in Public Water Systems
Table B.S.a SDWIS/FED (Round 2) Data- Aldrin Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
26
34
16
536


750
70

366
1,363
56
726

2,650
1,264
378
12
536
296
593

720
1,029
98
1,152
68
24
939

7
427
401
586


15,123

12,221

12,165
# GW PWS
25
24
11
431


538
35

184
1,295
29
669

2,570
1,234
280
11
490
258
560

691
882
76
999
57
15
841

2
122
349
517


13,195

10,569

10,540
# SW PWS
1
10
5
105


212
35

182
68
27
57

80
30
98
1
46
38
33

29
147
22
153
11
9
98

5
305
52
69


1,928

1,652

1,625
% PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.86%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.14%
0.00%
0.00%
0.00%
5.88%
0.00%
0.00%

0.00%
0.23%
0.00%
0.00%


0.21%

0.10%

0.02%
% GW PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.24%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.14%
0.00%
0.00%
0.00%
7.02%
0.00%
0.00%

0.00%
0.82%
0.00%
0.00%


0.17%

0.07%

0.02%
% SW PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
18.52%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.52%

0.30%

0.00%
% PWS
>HRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.86%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.14%
0.00%
0.00%
0.00%
5.88%
0.00%
0.00%

0.00%
0.23%
0.00%
0.00%


0.21%

0.10%

0.02%
% GW PWS
>HRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.24%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.14%
0.00%
0.00%
0.00%
7.02%
0.00%
0.00%

0.00%
0.82%
0.00%
0.00%


0.17%

0.07%

0.02%
% SW PWS
>HRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
18.52%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.52%

0.30%

0.00%
99% VALUE
(M9/L)
< 0.50
< 0.00
0.68
< 0.00


< 0.00
< 0.00

< 2.00
< 0.01
4.40
< 1.00

< 0.00
< 0.00
< 0.10
< 0.00
< 0.00
< 0.01
< 0.00

< 1.00
< 30.00
< 0.00
< 0.00
0.10
< 0.20
< 0.00

< 0.00
< 0.20
< 0.00
< 0.00


< 1.00

< 2.00

< 2.00
1.  Massachusetts data not included in "19 States" summary statistics for Aldrin.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory
analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Aldrin is 0.002 |jg/L. This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                               Occurrence of Unregulated Contaminants in Public Water Systems
Table B.S.b SDWIS/FED (Round 2) Data-Aldrin Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
26
34
16
536


750
70

366
1,363
56
726

2,650
1,264
378
12
536
296
593

720
1,029
98
1,152
68
24
939

7
427
401
586


15,123

12,221

12,165
TOTAL #
SAMPLES
36
69
25
1,610


2,226
312

1,557
3,333
184
1,395

4,089
6,033
1,053
29
742
383
614

4,268
1,293
120
2,682
179
263
5,705

46
1,479
633
1,207


41,565

31,267

31,083
#GW
SAMPLES
35
55
17
1,225


1,366
112

753
3,152
76
1,155

3,781
5,754
415
25
684
316
579

4,075
1,066
96
2,111
131
122
4,710

16
193
506
1,005


33,531

24,827

24,751
#SW
SAMPLES
1
14
8
385


860
200

804
181
108
240

308
279
638
4
58
67
35

193
227
24
571
48
141
995

30
1,286
127
202


8,034

6,440

6,332
% TOTAL
SAMPLES
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
13.04%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.02%
0.00%
0.00%
0.00%
2.23%
0.00%
0.00%

0.00%
0.07%
0.00%
0.00%


0.13%

0.08%

0.01%
%GW
SAMPLES
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.11%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.02%
0.00%
0.00%
0.00%
3.05%
0.00%
0.00%

0.00%
0.52%
0.00%
0.00%


0.11%

0.06%

0.01%
%sw
SAMPLES
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
10.19%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.24%

0.17%

0.00%
MIN VALUE
(H9/L)
< 0.02
< 0.00
0.07
< 0.00


< 0.00
< 0.00

< 0.01
< 0.01
< 0.08
< 0.01

< 0.00
< 0.00
< 0.05
< 0.00
< 0.00
< 0.00
< 0.00

< 0.01
< 0.00
< 0.00
< 0.00
< 0.00
< 0.00
< 0.00

< 0.00
< 0.20
< 0.00
< 0.00


< 0.00

< 0.00

< 0.00
99% VALUE
(H9/L)
< 0.50
< 0.00
0.68
< 0.00


< 0.00
< 0.00

< 2.00
< 0.01
4.40
< 1.00

< 0.00
< 0.00
< 0.10
< 0.00
< 0.00
< 0.01
< 0.00

< 1.00
< 30.00
< 0.00
< 0.00
0.10
< 0.20
< 0.00

< 0.00
< 0.20
< 0.00
< 0.00


< 1.00

< 2.00

< 2.00
MAX VALUE
(H9/L)
< 0.50
< 0.00
0.68
< 0.00


< 0.00
< 0.00

< 2.00
< 0.01
4.40
< 50.00

< 0.00
< 0.00
< 0.10
< 0.00
< 0.00
< 0.01
< 0.00

0.46
< 30.00
< 0.00
< 0.00
0.10
< 0.20
< 0.00

< 0.00
0.69
< 0.44
< 0.00


4.40

4.40

0.69
MIN
DETECTS
(M9/L)


0.07








0.10










0.46



0.10




0.69




0.07

0.10

0.46
MEDIAN
DETECTS
(M9/L)


0.12








0.84










0.46



0.10




0.69




0.18

0.84

0.58
1.  Massachusetts data not included in "19 States" summary statistics for Aldrin.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                     Occurrence of Unregulated Contaminants in Public Water Systems
Table B.S.c SDWIS/FED (Round 2) Data- Aldrin Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL #
SAMPLES
36
69
25
1,610


2,226
312

1,557
3,333
184
1,395

4,089
6,033
1,053
29
742
383
614

4,268
1,293
120
2,682
179
263
5,705

46
1,479
633
1,207


41,565

31,267

31,083
TOTAL
UNIQUE PWS
26
34
16
536


750
70

366
1,363
56
726

2,650
1,264
378
12
536
296
593

720
1,029
98
1,152
68
24
939

7
427
401
586


15,123

12,221

12,165
#GWPWS
25
24
11
431


538
35

184
1,295
29
669

2,570
1,234
280
11
490
258
560

691
882
76
999
57
15
841

2
122
349
517


13,195

10,569

10,540
#SWPWS
1
10
5
105


212
35

182
68
27
57

80
30
98
1
46
38
33

29
147
22
153
11
9
98

5
305
52
69


1,928

1,652

1,625
% PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.86%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.14%
0.00%
0.00%
0.00%
5.88%
0.00%
0.00%

0.00%
0.23%
0.00%
0.00%


0.21%

0.10%

0.02%
% GW PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.24%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.14%
0.00%
0.00%
0.00%
7.02%
0.00%
0.00%

0.00%
0.82%
0.00%
0.00%


0.17%

0.07%

0.02%
% SW PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
18.52%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

% PWS
> 1/2 HRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.86%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.14%
0.00%
0.00%
0.00%
5.88%
0.00%
0.00%

0.00%
0.23%
0.00%
0.00%


0.52%
0.21%

0.30%

0.00%
0.10%

0.02%
% GW PWS
> 1/2 HRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.24%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.14%
0.00%
0.00%
0.00%
7.02%
0.00%
0.00%

0.00%
0.82%
0.00%
0.00%


0.17%

0.07%

0.02%
% SW PWS
> 1/2 HRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
18.52%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.52%

0.30%

0.00%
% PWS
>HRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.86%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.14%
0.00%
0.00%
0.00%
5.88%
0.00%
0.00%

0.00%
0.23%
0.00%
0.00%


0.21%

0.10%

0.02%
% GW PWS
>HRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.24%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.14%
0.00%
0.00%
0.00%
7.02%
0.00%
0.00%

0.00%
0.82%
0.00%
0.00%


0.17%

0.07%

0.02%
% SW PWS
>HRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
18.52%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.52%

0.30%

0.00%
1.  Massachusetts data not included in "19 States" summary statistics for Aldrin.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Aldrin is 0.002 |jg/L.  This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                 Occurrence of Unregulated Contaminants in Public Water Systems
Table B.6.a SDWIS/FED (Round 2) Data- Butachlor Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
1
17
4
536


750
69

28

55
684

2,650
1,264
538

530
296
593

715
1,057
107
1,133
79
15
939

7
426
396
601


13,490

11,995

11,940
# GW PWS
1
16
2
431


538
35

10

28
627

2,570
1,234
437

483
258
560

686
910
82
982
67
6
841

2
121
343
531


11,801

10,510

10,482
# SW PWS
0
1
2
105


212
34

18

27
57

80
30
101

47
38
33

29
147
25
151
12
9
98

5
305
53
70


1,689

1,485

1,458
% PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%

14.55%
0.00%

0.00%
0.08%
0.56%

0.19%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
3.80%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.15%

0.11%

0.04%
% GW PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%

14.29%
0.00%

0.00%
0.08%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
4.48%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.08%

0.05%

0.01%
% SW PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%

14.81%
0.00%

0.00%
0.00%
2.97%

2.13%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.59%

0.54%

0.27%
% PWS
>HRL














% GW PWS
>HRL














% SW PWS
>HRL














There is no Health Reference Level (HRL),
Maximum Contaminant Level (MCL), or
Health Advisory Level (HAL) for Butachlor.




























































99% VALUE
(M9/L)
< 0.04
< 0.00
17.00
< 0.00


< 0.00
< 0.00

< 50.00

4.40
< 2.50

< 0.00
< 0.00
< 0.50

< 0.00
< 0.05
< 0.00

< 0.40
< 10.00
< 0.00
< 0.00
0.10
< 0.09
< 0.00

< 0.00
< 0.20
< 0.00
< 0.00


< 10.00

< 10.00

< 10.00
1.  Massachusetts data not included in "19 States" summary statistics for Butachlor.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory
analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                             Occurrence of Unregulated Contaminants in Public Water Systems
Table B.6.b SDWIS/FED (Round 2) Data- Butachlor Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
1
17
4
536


750
69

28

55
684

2,650
1,264
538

530
296
593

715
1,057
107
1,133
79
15
939

7
426
396
601


13,490

11,995

11,940
TOTAL #
SAMPLES
3
22
6
1,610


2,229
311

139

184
1,101

4,162
5,985
1,798

771
383
614

4,291
1,394
129
2,525
232
188
5,686

50
1,474
622
1,175


37,084

30,174

29,990
#GW
SAMPLES
3
21
2
1,225


1,367
112

42

74
895

3,780
5,706
780

713
316
579

4,098
1,163
100
1,969
161
82
4,699

20
190
492
973


29,562

24,073

23,999
#SW
SAMPLES
0
1
4
385


862
199

97

110
206

382
279
1,018

58
67
35

193
231
29
556
71
106
987

30
1,284
130
202


7,522

6,101

5,991
% TOTAL
SAMPLES
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%

8.70%
0.00%

0.00%
0.02%
0.17%

0.13%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
1.29%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.08%

0.07%

0.02%
%GW
SAMPLES
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%

14.86%
0.00%

0.00%
0.02%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
1.86%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.06%

0.05%

0.00%
%sw
SAMPLES
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%

4.55%
0.00%

0.00%
0.00%
0.29%

1.72%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.17%

0.15%

0.07%
MIN VALUE
(H9/L)
< 0.04
< 0.00
0.70
< 0.00


< 0.00
< 0.00

< 0.05

< 0.04
< 0.05

< 0.00
< 0.00
< 0.50
<
< 0.00
< 0.00
< 0.00

< 0.06
< 0.02
< 0.00
< 0.00
< 0.00
< 0.00
< 0.00

< 0.00
< 0.20
< 0.00
< 0.00


< 0.00

< 0.00

< 0.00
99% VALUE
(H9/L)
< 0.04
< 0.00
17.00
< 0.00


< 0.00
< 0.00

< 50.00

4.40
< 2.50

< 0.00
< 0.00
< 0.50

< 0.00
< 0.05
< 0.00

< 0.40
< 10.00
< 0.00
< 0.00
0.10
< 0.09
< 0.00

< 0.00
< 0.20
< 0.00
< 0.00


< 10.00

< 10.00

< 10.00
MAX VALUE
(H9/L)
< 0.04
< 0.00
17.00
< 0.00


< 0.00
< 0.00

< 50.00

4.40
< 50.00

< 0.00
0.70
0.72

0.10
< 0.05
< 0.00

< 0.80
< 10.00
< 0.00
< 0.00
0.10
< 0.09
< 0.00

< 0.00
< 0.20
< 0.44
< 0.00


17.00

4.40

0.72
MIN
DETECTS
(M9/L)


0.70








0.04



0.70
0.56

0.10







0.10









0.04

0.04

0.10
MEDIAN
DETECTS
(M9/L)


15.00








4.40



0.70
0.68

0.10







0.10









4.40

4.40

0.68
1.  Massachusetts data not included in "19 States" summary statistics for Butachlor.
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                 Occurrence of Unregulated Contaminants in Public Water Systems
Table B.6.C SDWIS/FED (Round 2) Data- Butachlor Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL #
SAMPLES
3
22
6
1,610


2,229
311

139

184
1,101

4,162
5,985
1,798

771
383
614

4,291
1,394
129
2,525
232
188
5,686

50
1,474
622
1,175


37,084

30,174

29,990
TOTAL
UNIQUE PWS
1
17
4
536


750
69

28

55
684

2,650
1,264
538

530
296
593

715
1,057
107
1,133
79
15
939

7
426
396
601


13,490

11,995

11,940
# GW PWS
1
16
2
431


538
35

10

28
627

2,570
1,234
437

483
258
560

686
910
82
982
67
6
841

2
121
343
531


11,801

10,510

10,482
# SW PWS
0
1
2
105


212
34

18

27
57

80
30
101

47
38
33

29
147
25
151
12
9
98

5
305
53
70


1,689

1,485

1,458
% PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%

14.55%
0.00%

0.00%
0.08%
0.56%

0.19%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
3.80%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.15%

0.11%

0.04%
% GW PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%

14.29%
0.00%

0.00%
0.08%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
4.48%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.08%

0.05%

0.01%
% SW PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%

14.81%
0.00%

0.00%
0.00%
2.97%

2.13%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

%PWS
> 1/2 HRL
















% GW PWS
> 1/2 HRL
















% SW PWS
> 1/2 HRL
















% PWS
>HRL
















% GW PWS
>HRL
















% SW PWS
>HRL
















There is no Health Reference Level (HRL), Maximum Contaminant Level (MCL), or Health
Advisory Level (HAL) for Butachlor.

















0.59%|

0.54%

0.27%

















































































































1. Massachusetts data not included in "19 States" summary statistics for Butachlor.
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                    Occurrence of Unregulated Contaminants in Public Water Systems
Table B.7.a SDWIS/FED (Round 2) Data- Carbaryl Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
25
28

527


749
73

31
1,363
56
175

2,633
1,270
374
11
465
296
592

715
1,226
128
1,152
502
33
952

7
1,902
432
327


16,044

12,679

12,623
# GW PWS
24
21

431


538
38

17
1,295
29
142

2,553
1,240
276
10
441
258
559

686
1,072
100
999
350
24
852

2
1,453
378
276


14,064

11,115

11,086
# SW PWS
1
7

96


211
35

14
68
27
33

80
30
98
1
24
38
33

29
154
28
153
152
9
100

5
449
54
51


1,980

1,564

1,537
% PWS
>MRL
0.00%
0.00%

0.00%


0.27%
0.00%

0.00%
0.00%
16.07%
0.00%

0.00%
0.00%
0.27%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
6.97%
3.03%
0.00%

0.00%
0.00%
0.23%
0.00%


0.31%

0.10%

0.03%
% GW PWS
>MRL
0.00%
0.00%

0.00%


0.37%
0.00%

0.00%
0.00%
17.24%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
1.43%
0.00%
0.00%

0.00%
0.00%
0.26%
0.00%


0.09%

0.06%

0.02%
% SW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
14.81%
0.00%

0.00%
0.00%
1.02%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
19.74%
11.11%
0.00%

0.00%
0.00%
0.00%
0.00%


1.82%

0.38%

0.13%
% PWS
>MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.20%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% GW PWS
>MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.29%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% SW PWS
>MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
99% VALUE
(M9/L)
< 5.00
< 0.00

< 0.00


< 0.00
< 0.00

< 2.00
< 0.19
1.00
< 4.00

< 0.00
< 0.00
< 1.00
< 0.00
< 0.00
< 0.50
< 0.00

< 5.00
< 10.00
< 0.00
< 0.00
4.00
< 1.00
< 0.00

< 0.00
< 5.00
< 1.00
< 0.20


< 10.00

< 10.00

< 10.00
1.  Massachusetts data not included in "19 States" summary statistics for Carbaryl.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory
analyses)

"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL violation. An MCL
violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Carbaryl is 700 (jg/L.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                              Occurrence of Unregulated Contaminants in Public Water Systems
Table B.7.b SDWIS/FED (Round 2) Data- Carbaryl Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
25
28

527


749
73

31
1,363
56
175

2,633
1,270
374
11
465
296
592

715
1,226
128
1,152
502
33
952

7
1,902
432
327


16,044

12,679

12,623
TOTAL #
SAMPLES
35
46

1,762


2,223
326

112
3,333
188
464

4,005
5,910
1,039
28
694
383
613

4,139
2,025
165
2,682
2,065
173
5,715

46
4,832
739
727


44,469

32,182

31,994
#GW
SAMPLES
34
34

1,494


1,367
127

62
3,152
77
330

3,714
5,678
404
24
659
316
578

3,956
1,780
133
2,103
1,263
96
4,665

16
2,556
577
570


35,765

25,907

25,830
#SW
SAMPLES
1
12

268


856
199

50
181
111
134

291
232
635
4
35
67
35

183
245
32
579
802
77
1,050

30
2,276
162
157


8,704

6,275

6,164
% TOTAL
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.09%
0.00%

0.00%
0.00%
12.77%
0.00%

0.00%
0.00%
0.10%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
3.29%
0.58%
0.00%

0.00%
0.00%
0.14%
0.00%


0.22%

0.09%

0.01%
%GW
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.15%
0.00%

0.00%
0.00%
16.88%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.48%
0.00%
0.00%

0.00%
0.00%
0.17%
0.00%


0.06%

0.06%

0.01%
%sw
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
9.91%
0.00%

0.00%
0.00%
0.16%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
7.73%
1.30%
0.00%

0.00%
0.00%
0.00%
0.00%


0.86%

0.21%

0.03%
MIN VALUE
(H9/L)
< 0.40
< 0.00

< 0.00


< 0.00
< 0.00

< 0.20
< 0.19
< 0.18
< 0.50

< 0.00
< 0.00
< 1.00
< 0.00
< 0.00
< 0.00
< 0.00

< 0.00
< 0.34
< 0.00
< 0.00
< 0.00
< 0.00
< 0.00

< 0.00
< 5.00
< 0.00
< 0.00


< 0.00

< 0.00

< 0.00
99% VALUE
(H9/L)
< 5.00
< 0.00

< 0.00


< 0.00
< 0.00

< 2.00
< 0.19
1.00
< 4.00

< 0.00
< 0.00
< 1.00
< 0.00
< 0.00
< 0.50
< 0.00

< 5.00
< 10.00
< 0.00
< 0.00
4.00
< 1.00
< 0.00

< 0.00
< 5.00
< 1.00
< 0.20


< 10.00

< 10.00

< 10.00
MAX VALUE
(H9/L)
< 5.00
< 0.00

< 0.00


3.00
< 0.00

< 2.00
< 0.19
1.00
< 5.00

< 0.00
< 0.00
1.00
< 0.00
< 0.00
< 0.50
< 0.00

< 11.00
< 10.00
< 0.00
< 0.00
1000.00
0.68
< 0.00

< 0.00
< 5.00
1.00
< 0.20


1000.00

3.00

3.00
MIN
DETECTS
(M9/L)






1.00




0.18




1.00









0.18
0.68




1.00



0.18

0.18

0.68
MEDIAN
DETECTS
(M9/L)






2.00




0.18




1.00









1.00
0.68




1.00



1.00

0.18

1.00
1.  Massachusetts data not included in "19 States" summary statistics for Carbaryl.
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                    Occurrence of Unregulated Contaminants in Public Water Systems
Table B.7.C  SDWIS/FED (Round 2) Data- Carbaryl Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL #
SAMPLES
35
46

1,762


2,223
326

112
3,333
188
464

4,005
5,910
1,039
28
694
383
613

4,139
2,025
165
2,682
2,065
173
5,715

46
4,832
739
727


44,471

35,515

35,327
TOTAL
UNIQUE PWS
25
28

527


749
73

31
1,363
56
175

2,633
1,270
374
11
465
296
592

715
1,226
128
1,152
502
33
952

7
1,902
432
327


16,044

12,679

12,623
3GWPWS
24
21

431


538
38

17
1,295
29
142

2,553
1,240
276
10
441
258
559

686
1,072
100
999
350
24
852

2
1,453
378
276


14,064

11,115

11,086
3SWPWS
1
7

96


211
35

14
68
27
33

80
30
98
1
24
38
33

29
154
28
153
152
9
100

5
449
54
51


1,980

1,564

1,537
%PWS
>MRL
0.00%
0.00%

0.00%


0.27%
0.00%

0.00%
0.00%
16.07%
0.00%

0.00%
0.00%
0.27%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
6.97%
3.03%
0.00%

0.00%
0.00%
0.23%
0.00%


0.31%

0.10%

0.03%
% GW PWS
>MRL
0.00%
0.00%

0.00%


0.37%
0.00%

0.00%
0.00%
17.24%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
1.43%
0.00%
0.00%

0.00%
0.00%
0.26%
0.00%


0.09%

0.06%

0.02%
% SW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
14.81%
0.00%

0.00%
0.00%
1 .02%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
19.74%
11.11%
0.00%

0.00%
0.00%
0.00%
0.00%

% PWS
> 1/2 MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.20%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


1.82%| 0.01%

0.38%

0.13%
0.00%

0.00%
% GW PWS
> 1/2 MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.29%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% SW PWS
> 1/2 MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
%PWS
>MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.20%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% GW PWS
>MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.29%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% SW PWS
>MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
1.  Massachusetts data not included in "19 States" summary statistics for Carbaryl.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL violation. An MCL violation occurs when the MCL is
exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Carbaryl is 700 pg/L.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                    Occurrence of Unregulated Contaminants in Public Water Systems
Table B.S.a SDWIS/FED (Round 2) Data- Dicamba Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
3
16
3
386


749


416
1,363
55
724

2,633
1,260
555
9
571
296
592

710
1,332
187
1,148
647
10
873

7
1,919
485
530


17,479

14,089

14,034
# GW PWS
3
14
3
310


538


201
1,295
28
667

2,553
1,230
455
8
516
258
559

681
1,172
145
994
474
3
777

2
1,462
427
462


15,237

12,248

12,220
# SW PWS
0
2
0
76


211


215
68
27
57

80
30
100
1
55
38
33

29
160
42
154
173
7
96

5
457
58
68


2,242

1,841

1,814
% PWS
>MRL
0.00%
0.00%
100.00%
0.00%


1.87%


0.24%
0.00%
16.36%
0.69%

0.00%
0.87%
1.26%
0.00%
0.18%
0.34%
0.00%

0.00%
0.53%
0.53%
0.00%
4.33%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.50%

0.40%

0.34%
% GW PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.93%


0.00%
0.00%
17.86%
0.75%

0.00%
0.65%
1.32%
0.00%
0.00%
0.00%
0.00%

0.00%
0.09%
0.69%
0.00%
2.74%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.31%

0.25%

0.21%
% SW PWS
>MRL
0.00%
0.00%
0.00%
0.00%


4.27%


0.47%
0.00%
14.81%
0.00%

0.00%
10.00%
1.00%
0.00%
1.82%
2.63%
0.00%

0.00%
3.75%
0.00%
0.00%
8.67%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


1.83%

1.41%

1.21%
% PWS
>MCL
0.00%
0.00%
0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.31%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% GW PWS
>MCL
0.00%
0.00%
0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.21%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% SW PWS
>MCL
0.00%
0.00%
0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.58%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.04%

0.00%

0.00%
99% VALUE
(M9/L)
< 0.10
< 0.00
0.40
< 0.00


< 0.00


< 50.00
< 0.08
0.04
< 2.00

< 0.00
< 0.00
< 1.00
< 0.00
< 0.00
< 0.10
< 0.00

< 2.00
< 10.00
< 0.00
< 0.00
5.00
< 0.40
< 0.00

< 0.00
< 1.00
< 0.10
< 0.00


< 10.00

< 10.00

< 10.00
1.  Massachusetts data not included in "19 States" summary statistics for Dicamba.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory
analyses)

"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL violation.  An MCL
violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as  required by the primacy States.
The Maximum Contaminant Level (MCL) for Dicamba is 200 (jg/L.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                              Occurrence of Unregulated Contaminants in Public Water Systems
Table B.S.b SDWIS/FED (Round 2) Data- Dicamba Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
3
16
3
386


749


416
1,363
55
724

2,633
1,260
555
9
571
296
592

710
1,332
187
1,148
647
10
873

7
1,919
485
530


17,479

14,089

14,034
TOTAL #
SAMPLES
3
19
3
743


2,213


1,863
3,333
180
1,462

4,049
5,850
1,696
26
816
385
615

4,058
2,252
260
2,679
2,600
52
4,108

46
4,937
886
1,087


46,221

35,216

35,036
#GW
SAMPLES
3
16
3
573


1,367


837
3,152
71
1,168

3,751
5,582
1,043
22
749
318
580

3,875
1,991
205
2,088
1,755
19
3,283

16
2,615
702
895


36,679

27,743

27,672
#SW
SAMPLES
0
3
0
170


846


1,026
181
109
294

298
268
653
4
67
67
35

183
261
55
591
845
33
825

30
2,322
184
192


9,542

7,473

7,364
% TOTAL
SAMPLES
>MRL
0.00%
0.00%
100.00%
0.00%


0.86%


0.05%
0.00%
12.78%
0.34%

0.00%
0.21%
0.53%
0.00%
0.12%
0.26%
0.00%

0.00%
0.36%
0.38%
0.00%
2.85%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.34%

0.23%

0.16%
%GW
SAMPLES
>MRL
0.00%
0.00%
100.00%
0.00%


0.59%


0.00%
0.00%
18.31%
0.43%

0.00%
0.16%
0.77%
0.00%
0.00%
0.00%
0.00%

0.00%
0.05%
0.49%
0.00%
1.71%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.21%

0.16%

0.12%
%sw
SAMPLES
>MRL
0.00%
0.00%
0.00%
0.00%


1.30%


0.10%
0.00%
9.17%
0.00%

0.00%
1.12%
0.15%
0.00%
1.49%
1.49%
0.00%

0.00%
2.68%
0.00%
0.00%
5.21%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.83%

0.47%

0.34%
MIN VALUE
(H9/L)
< 0.05
< 0.00
0.30
< 0.00


< 0.00


< 0.01
< 0.08
< 0.04
< 0.05

< 0.00
< 0.00
< 0.50
< 0.00
< 0.00
< 0.00
< 0.00

< 0.06
< 0.02
< 0.00
< 0.00
< 0.00
< 0.40
< 0.00

< 0.00
< 1.00
< 0.00
< 0.00


< 0.00

< 0.00

< 0.00
99% VALUE
(H9/L)
< 0.10
< 0.00
0.40
< 0.00


< 0.00


< 50.00
< 0.08
0.04
< 2.00

< 0.00
< 0.00
< 1.00
< 0.00
< 0.00
< 0.10
< 0.00

< 2.00
< 10.00
< 0.00
< 0.00
5.00
< 0.40
< 0.00

< 0.00
< 1.00
< 0.10
< 0.00


< 10.00

< 10.00

< 10.00
MAX VALUE
(H9/L)
< 0.10
< 0.00
0.40
< 0.00


1.40


0.07
< 0.08
4.40
0.27

< 0.00
0.44
4.06
< 0.00
0.10
0.10
< 0.00

< 2.00
0.10
0.03
< 0.00
1600.00
< 0.40
< 0.00

< 0.00
< 1.00
< 10.00
< 0.00


1600.00

4.40

4.06
MIN
DETECTS
(M9/L)


0.30



0.08


0.07

0.04
0.08


0.08
0.53

0.10
0.10



0.02
0.03

0.08









0.02

0.02

0.02
MEDIAN
DETECTS
(M9/L)


0.30



0.26


0.07

0.04
0.25


0.15
2.69

0.10
0.10



0.05
0.03

0.50









0.50

0.12

0.20
1.  Massachusetts data not included in "19 States" summary statistics for Dicamba.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                   Occurrence of Unregulated Contaminants in Public Water Systems
Table B.S.c  SDWIS/FED (Round 2) Data- Dicamba Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL #
SAMPLES
3
19
3
743


2,213


1,863
3,333
180
1,462

4,049
5,850
1,696
26
816
385
615

4,058
2,252
260
2,679
2,600
52
4,108

46
4,937
886
1,087


46,221

35,216

35,036
TOTAL
UNIQUE PWS
3
16
3
386


749


416
1,363
55
724

2,633
1,260
555
9
571
296
592

710
1,332
187
1,148
647
10
873

7
1,919
485
530


17,479

14,089

14,034
3GWPWS
3
14
3
310


538


201
1,295
28
667

2,553
1,230
455
8
516
258
559

681
1,172
145
994
474
3
111

2
1,462
427
462


15,237

12,248

12,220
3SWPWS
0
2
0
76


211


215
68
27
57

80
30
100
1
55
38
33

29
160
42
154
173
7
96

5
457
58
68


2,242

1,841

1,814
%PWS
>MRL
0.00%
0.00%
100.00%
0.00%


1 .87%


0.24%
0.00%
16.36%
0.69%

0.00%
0.87%
1 .26%
0.00%
0.18%
0.34%
0.00%

0.00%
0.53%
0.53%
0.00%
4.33%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.50%

0.40%

0.34%
% GW PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.93%


0.00%
0.00%
17.86%
0.75%

0.00%
0.65%
1.32%
0.00%
0.00%
0.00%
0.00%

0.00%
0.09%
0.69%
0.00%
2.74%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.31%

0.25%

0.21%
% SW PWS
>MRL
0.00%
0.00%
0.00%
0.00%


4.27%


0.47%
0.00%
14.81%
0.00%

0.00%
10.00%
1 .00%
0.00%
1 .82%
2.63%
0.00%

0.00%
3.75%
0.00%
0.00%
8.67%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

% PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.31%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


1.83%| 0.01%

1.41%

1.21%
0.00%

0.00%
% GW PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.21%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% SW PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.58%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.04%

0.00%

0.00%
%PWS
>MCL
0.00%
0.00%
0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.31%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% GW PWS
>MCL
0.00%
0.00%
0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.21%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% SW PWS
>MCL
0.00%
0.00%
0.00%
0.00%


0.00%


0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.58%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.04%

0.00%

0.00%
1.  Massachusetts data not included in "19 States" summary statistics for Dicamba.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL violation.  An MCL violation occurs when the MCL is
exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Dicamba is 200 pg/L.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                    Occurrence of Unregulated Contaminants in Public Water Systems
Table B.9.a SDWIS/FED (Round 2) Data- Dieldrin Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
25
16
4
536


749
70

44
1,363
55
725

2,650
1,264
378
12
522
296
593

716
1,029
98
1,148
67
15
939

7
427
395
582


14,725

11,843

11,788
# GW PWS
24
12
4
431


537
35

20
1,295
28
668

2,570
1,234
280
11
475
258
560

687
883
76
995
56
6
841

2
122
343
515


12,968

10,357

10,329
# SW PWS
1
4
0
105


212
35

24
68
27
57

80
30
98
1
47
38
33

29
146
22
153
11
9
98

5
305
52
67


1,757

1,486

1,459
% PWS
>MRL
0.00%
0.00%
100.00%
0.19%


0.00%
1.43%

0.00%
0.00%
18.18%
0.97%

0.00%
0.00%
0.00%
0.00%
0.38%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
7.46%
0.00%
0.00%

0.00%
0.23%
0.00%
0.00%


0.21%

0.18%

0.09%
% GW PWS
>MRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.86%
0.90%

0.00%
0.00%
0.00%
0.00%
0.42%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
8.93%
0.00%
0.00%

0.00%
0.82%
0.00%
0.00%


0.18%

0.14%

0.09%
% SW PWS
>MRL
0.00%
0.00%
0.00%
0.95%


0.00%
2.86%

0.00%
0.00%
18.52%
1.75%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.46%

0.47%

0.14%
% PWS
>HRL
0.00%
0.00%
100.00%
0.19%


0.00%
1.43%

0.00%
0.00%
18.18%
0.97%

0.00%
0.00%
0.00%
0.00%
0.38%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
7.46%
0.00%
0.00%

0.00%
0.23%
0.00%
0.00%


0.21%

0.18%

0.09%
% GW PWS
>HRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.86%
0.90%

0.00%
0.00%
0.00%
0.00%
0.42%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
8.93%
0.00%
0.00%

0.00%
0.82%
0.00%
0.00%


0.18%

0.14%

0.09%
% SW PWS
>HRL
0.00%
0.00%
0.00%
0.95%


0.00%
2.86%

0.00%
0.00%
18.52%
1.75%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.46%

0.47%

0.14%
99% VALUE
(M9/L)
< 0.10
< 0.00
0.10
< 0.00


< 0.00
< 0.00

< 0.21
< 0.07
4.40
< 1.00

< 0.00
< 0.00
< 0.10
< 0.00
< 0.00
< 0.01
< 0.00

< 0.20
< 20.00
< 0.00
< 0.00
0.10
< 0.30
< 0.00

< 0.00
< 0.20
< 0.00
< 0.00


< 0.30

< 1.00

< 1.00
1.  Massachusetts data not included in "19 States" summary statistics for Dieldrin.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory
analyses)
The Health Reference Level (HRL) is the estimated  health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Dieldrin is 0.002 |jg/L. This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                            Occurrence of Unregulated Contaminants in Public Water Systems
Table B.9.b SDWIS/FED (Round 2) Data- Dieldrin Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
25
16
4
536


749
70

44
1,363
55
725

2,650
1,264
378
12
522
296
593

716
1,029
98
1,148
67
15
939

7
427
395
582


14,725

11,843

11,788
TOTAL #
SAMPLES
35
19
5
1,610


2,226
326

215
3,333
181
1,392

4,089
5,985
1,053
29
757
383
614

4,263
1,291
120
2,661
175
254
5,698

46
1,477
624
1,194


40,055

29,784

29,603
#GW
SAMPLES
34
15
5
1,225


1,365
116

87
3,152
74
1,156

3,781
5,706
415
25
699
316
579

4,071
1,066
96
2,096
127
111
4,703

16
193
494
994


32,717

24,045

23,971
#SW
SAMPLES
1
4
0
385


861
210

128
181
107
236

308
279
638
4
58
67
35

192
225
24
565
48
143
995

30
1,284
130
200


7,338

5,739

5,632
% TOTAL
SAMPLES
>MRL
0.00%
0.00%
100.00%
0.06%


0.00%
0.31%

0.00%
0.00%
13.26%
0.86%

0.00%
0.00%
0.00%
0.00%
0.40%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
2.86%
0.00%
0.00%

0.00%
0.20%
0.00%
0.00%


0.13%

0.14%

0.06%
%GW
SAMPLES
>MRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.57%
0.95%

0.00%
0.00%
0.00%
0.00%
0.43%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
3.94%
0.00%
0.00%

0.00%
1.55%
0.00%
0.00%


0.12%

0.12%

0.07%
%sw
SAMPLES
>MRL
0.00%
0.00%
0.00%
0.26%


0.00%
0.48%

0.00%
0.00%
10.28%
0.42%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.19%

0.23%

0.04%
MIN VALUE
(H9/L)
< 0.01
< 0.00
0.01
< 0.00


< 0.00
< 0.00

< 0.01
< 0.07
< 0.02
< 0.01

< 0.00
< 0.00
< 0.05
< 0.00
< 0.00
< 0.00
< 0.00

< 0.03
< 0.00
< 0.00
< 0.00
< 0.00
< 0.00
< 0.00

< 0.00
< 0.20
< 0.00
< 0.00


< 0.00

< 0.00

< 0.00
99% VALUE
(H9/L)
< 0.10
< 0.00
0.10
< 0.00


< 0.00
< 0.00

< 0.21
< 0.07
4.40
< 1.00

< 0.00
< 0.00
< 0.10
< 0.00
< 0.00
< 0.01
< 0.00

< 0.20
< 20.00
< 0.00
< 0.00
0.10
< 0.30
< 0.00

< 0.00
< 0.20
< 0.00
< 0.00


< 0.30

< 1.00

< 1.00
MAX VALUE
(H9/L)
< 0.10
< 0.00
0.10
0.06


< 0.00
0.01

< 0.88
< 0.07
4.40
0.35

< 0.00
< 0.00
< 0.10
< 0.00
0.20
< 0.01
< 0.00

< 1.00
< 20.00
< 0.00
< 0.00
0.13
< 0.30
< 0.00

< 0.00
1.36
< 0.44
< 0.00


4.40

4.40

1.36
MIN
DETECTS
(M9/L)


0.01
0.06



0.01



0.50
0.02





0.10







0.10




0.73




0.01

0.02

0.02
MEDIAN
DETECTS
(M9/L)


0.04
0.06



0.01



4.40
0.12





0.10







0.10




0.90




0.42

0.50

0.16
1.  Massachusetts data not included in "19 States" summary statistics for Dieldrin.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                     Occurrence of Unregulated Contaminants in Public Water Systems
Table B.9.C SDWIS/FED (Round 2) Data- Dieldrin Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL #
SAMPLES
35
19
5
1,610


2,226
326

215
3,333
181
1,392

4,089
5,985
1,053
29
757
383
614

4,263
1,291
120
2,661
175
254
5,698

46
1,477
624
1,194


40,055

29,784

29,603
TOTAL
UNIQUE PWS
25
16
4
536


749
70

44
1,363
55
725

2,650
1,264
378
12
522
296
593

716
1,029
98
1,148
67
15
939

7
427
395
582


14,725

11,843

11,788
3GWPWS
24
12
4
431


537
35

20
1,295
28
668

2,570
1,234
280
11
475
258
560

687
883
76
995
56
6
841

2
122
343
515


12,968

10,357

10,329
3SWPWS
1
4
0
105


212
35

24
68
27
57

80
30
98
1
47
38
33

29
146
22
153
11
9
98

5
305
52
67


1,757

1,486

1,459
%PWS
>MRL
0.00%
0.00%
100.00%
0.19%


0.00%
1.43%

0.00%
0.00%
18.18%
0.97%

0.00%
0.00%
0.00%
0.00%
0.38%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
7.46%
0.00%
0.00%

0.00%
0.23%
0.00%
0.00%


0.21%

0.18%

0.09%
% GW PWS
>MRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%
0.00%
1 7.86%
0.90%

0.00%
0.00%
0.00%
0.00%
0.42%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
8.93%
0.00%
0.00%

0.00%
0.82%
0.00%
0.00%


0.18%

0.14%

0.09%
% SW PWS
>MRL
0.00%
0.00%
0.00%
0.95%


0.00%
2.86%

0.00%
0.00%
18.52%
1.75%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

% PWS
> 1/2 HRL
0.00%
0.00%
100.00%
0.19%


0.00%
1 .43%

0.00%
0.00%
18.18%
0.97%

0.00%
0.00%
0.00%
0.00%
0.38%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
7.46%
0.00%
0.00%

0.00%
0.23%
0.00%
0.00%


0.46%| 0.21%

0.47%

0.14%
0.18%

0.09%
% GW PWS
> 1/2 HRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.86%
0.90%

0.00%
0.00%
0.00%
0.00%
0.42%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
8.93%
0.00%
0.00%

0.00%
0.82%
0.00%
0.00%


0.18%

0.14%

0.09%
% SW PWS
> 1/2 HRL
0.00%
0.00%
0.00%
0.95%


0.00%
2.86%

0.00%
0.00%
1 8.52%
1 .75%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.46%

0.47%

0.14%
%PWS
>HRL
0.00%
0.00%
100.00%
0.19%


0.00%
1.43%

0.00%
0.00%
18.18%
0.97%

0.00%
0.00%
0.00%
0.00%
0.38%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
7.46%
0.00%
0.00%

0.00%
0.23%
0.00%
0.00%


0.21%

0.18%

0.09%
% GW PWS
>HRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%
0.00%
17.86%
0.90%

0.00%
0.00%
0.00%
0.00%
0.42%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
8.93%
0.00%
0.00%

0.00%
0.82%
0.00%
0.00%


0.18%

0.14%

0.09%
% SW PWS
>HRL
0.00%
0.00%
0.00%
0.95%


0.00%
2.86%

0.00%
0.00%
18.52%
1.75%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.46%

0.47%

0.14%
1.  Massachusetts data not included in "19 States" summary statistics for Dieldrin.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Dieldrin is 0.002 |jg/L. This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                 Occurrence of Unregulated Contaminants in Public Water Systems
Table B.IO.a  SDWIS/FED (Round 2) Data- 3-Hydroxycarbofuran Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
25
28

527


749
74

33
1,363
56
174

2,633
1,270
374
11
523
296
591

715
1,175
128
1,150
583
29
952

8
1,923
432
326


16,148

12,700

12,644
# GW PWS
24
21

431


538
38

18
1,295
29
142

2,553
1,240
276
10
478
258
558

686
1,024
100
997
383
20
852

2
1,473
378
275


14,099

11,117

11,088
# SW PWS
1
7

96


211
36

15
68
27
32

80
30
98
1
45
38
33

29
151
28
153
200
9
100

6
450
54
51


2,049

1,583

1,556
% PWS
>MRL
0.00%
0.00%

0.00%


0.40%
0.00%

0.00%
0.00%
16.07%
0.00%

0.00%
0.00%
0.80%
0.00%
0.19%
0.00%
0.00%

0.14%
0.00%
0.00%
0.09%
8.06%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.40%

0.14%

0.07%
% GW PWS
>MRL
0.00%
0.00%

0.00%


0.19%
0.00%

0.00%
0.00%
17.24%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.10%
2.35%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.11%

0.06%

0.02%
% SW PWS
>MRL
0.00%
0.00%

0.00%


0.95%
0.00%

0.00%
0.00%
14.81%
0.00%

0.00%
0.00%
3.06%
0.00%
2.22%
0.00%
0.00%

3.45%
0.00%
0.00%
0.00%
19.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


2.39%

0.69%

0.45%
% PWS
>HRL














% GW PWS
>HRL














% SW PWS
>HRL














There is no Health Reference Level (HRL),
Maximum Contaminant Level (MCL), or
Health Advisory Level (HAL) for 3-
Hydroxycarbofuran.




























































99% VALUE
(M9/L)
< 5.00
< 0.00

< 0.00


< 0.00
< 0.00

< 2.00
< 0.49
2.20
< 4.00

< 0.00
< 0.00
< 1.00
< 0.00
< 0.00
< 0.50
< 0.00

< 5.00
< 10.00
< 0.00
< 0.00
4.00
< 1.00
< 0.00

< 0.00
< 5.00
< 0.59
< 0.20


< 10.00

< 10.00

< 10.00
1.  Massachusetts data not included in "19 States" summary statistics for 3-Hydroxycarbofuran.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory
analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                             Occurrence of Unregulated Contaminants in Public Water Systems
Table B.IO.b SDWIS/FED (Round 2) Data- 3-Hydroxycarbofuran Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
25
28

527


749
74

33
1,363
56
174

2,633
1,270
374
11
523
296
591

715
1,175
128
1,150
583
29
952

8
1,923
432
326


16,148

12,700

12,644
TOTAL #
SAMPLES
34
58

1,762


2,215
335

131
3,333
188
456

4,004
5,910
1,035
28
765
383
612

4,134
1,939
165
2,680
2,659
166
5,711

47
4,892
740
727


45,109

32,222

32,034
#GW
SAMPLES
33
46

1,494


1,360
130

69
3,152
77
330

3,713
5,678
404
24
709
316
577

3,951
1,700
133
2,102
1,407
90
4,661

16
2,608
576
570


35,926

25,927

25,850
#SW
SAMPLES
1
12

268


855
205

62
181
111
126

291
232
631
4
56
67
35

183
239
32
578
1,252
76
1,050

31
2,284
164
157


9,183

6,295

6,184
% TOTAL
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.14%
0.00%

0.00%
0.00%
12.77%
0.00%

0.00%
0.00%
0.29%
0.00%
0.13%
0.00%
0.00%

0.02%
0.00%
0.00%
0.04%
3.95%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.31%

0.10%

0.03%
%GW
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.07%
0.00%

0.00%
0.00%
16.88%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.05%
0.92%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.08%

0.06%

0.01%
%sw
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.23%
0.00%

0.00%
0.00%
9.91%
0.00%

0.00%
0.00%
0.48%
0.00%
1.79%
0.00%
0.00%

0.55%
0.00%
0.00%
0.00%
7.35%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


1.20%

0.29%

0.11%
MIN VALUE
(H9/L)
< 0.80
< 0.00

< 0.00


< 0.00
< 0.00

< 0.20
< 0.49
< 0.20
< 0.40

< 0.00
< 0.00
< 1.00
< 0.00
< 0.00
< 0.00
< 0.00

< 0.00
< 0.50
< 0.00
< 0.00
< 0.00
< 0.00
< 0.00

< 0.00
< 5.00
< 0.00
< 0.00


< 0.00

< 0.00

< 0.00
99% VALUE
(H9/L)
< 5.00
< 0.00

< 0.00


< 0.00
< 0.00

< 2.00
< 0.49
2.20
< 4.00

< 0.00
< 0.00
< 1.00
< 0.00
< 0.00
< 0.50
< 0.00

< 5.00
< 10.00
< 0.00
< 0.00
4.00
< 1.00
< 0.00

< 0.00
< 5.00
< 0.59
< 0.20


< 10.00

< 10.00

< 10.00
MAX VALUE
(H9/L)
< 5.00
< 0.00

< 0.00


66.30
< 0.00

< 2.00
< 0.49
2.20
< 5.00

< 0.00
< 0.00
1.12
< 0.00
1.50
< 0.50
< 0.00

12.00
< 10.00
< 0.00
1.50
1100.00
< 1.00
< 0.00

< 0.00
< 5.00
< 2.00
< 0.20


1100.00

66.30

66.30
MIN
DETECTS
(M9/L)






1.00




2.20




1.00

1.50



12.00


1.50
0.20









0.20

1.00

1.00
MEDIAN
DETECTS
(M9/L)






8.50




2.20




1.09

1.50



12.00


1.50
1.00









2.00

2.20

1.50
1.  Massachusetts data not included in "19 States" summary statistics for 3-Hydroxycarbofuran.
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                 Occurrence of Unregulated Contaminants in Public Water Systems
Table B.10.C SDWIS/FED (Round 2) Data- 3-Hydroxycarbofuran Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL #
SAMPLES
34
58

1,762


2,215
335

131
3,333
188
456

4,004
5,910
1,035
28
765
383
612

4,134
1,939
165
2,680
2,659
166
5,711

47
4,892
740
727


45,109

32,222

32,034
TOTAL
UNIQUE PWS
25
28

527


749
74

33
1,363
56
174

2,633
1,270
374
11
523
296
591

715
1,175
128
1,150
583
29
952

8
1,923
432
326


16,148

12,700

12,644
# GW PWS
24
21

431


538
38

18
1,295
29
142

2,553
1,240
276
10
478
258
558

686
1,024
100
997
383
20
852

2
1,473
378
275


14,099

11,117

11,088
# SW PWS
1
7

96


211
36

15
68
27
32

80
30
98
1
45
38
33

29
151
28
153
200
9
100

6
450
54
51


2,049

1,583

1,556
% PWS
>MRL
0.00%
0.00%

0.00%


0.40%
0.00%

0.00%
0.00%
16.07%
0.00%

0.00%
0.00%
0.80%
0.00%
0.19%
0.00%
0.00%

0.14%
0.00%
0.00%
0.09%
8.06%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.40%

0.14%

0.07%
% GW PWS
>MRL
0.00%
0.00%

0.00%


0.19%
0.00%

0.00%
0.00%
17.24%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.10%
2.35%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.11%

0.06%

0.02%
% SW PWS
>MRL
0.00%
0.00%

0.00%


0.95%
0.00%

0.00%
0.00%
14.81%
0.00%

0.00%
0.00%
3.06%
0.00%
2.22%
0.00%
0.00%

3.45%
0.00%
0.00%
0.00%
19.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

% PWS
> 1/2 HRL
















% GW PWS
> 1/2 HRL
















% SW PWS
> 1/2 HRL
















There is no Health Reference Level (HRL), M
Advisory Level (HAL) fc

















2.39%


0.69%

0.45%















































% PWS
>HRL
















aximum Contan























% GW PWS
>HRL
















% SW PWS
>HRL
















ninant Level (MCL), or Health
jofuran.












































1. Massachusetts data not included in "19 States" summary statistics for 3-Hydroxycarbofuran.
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                   Occurrence of Unregulated Contaminants in Public Water Systems
Table B.11 .a SDWIS/FED (Round 2) Data- Methomyl Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
25
29
1
527


747
74

33

55
175

2,633
1,270
374
11
480
296
590

717
1,187
128
1,151
481
33
952

7
1,907
432
327


14,642

12,659

12,604
# GW PWS
24
22
1
431


536
38

18

28
142

2,553
1,240
276
10
455
258
557

688
1,036
100
998
338
24
852

2
1,458
378
276


12,739

11,096

11,068
# SW PWS
1
7
0
96


211
36

15

27
33

80
30
98
1
25
38
33

29
151
28
153
143
9
100

5
449
54
51


1,903

1,563

1,536
% PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%

16.36%
0.00%

0.00%
0.08%
0.53%
0.00%
0.63%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
5.61%
3.03%
0.00%

0.00%
0.00%
0.00%
0.61%


0.31%

0.14%

0.07%
% GW PWS
>MRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

17.86%
0.00%

0.00%
0.08%
0.00%
0.00%
0.66%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.89%
0.00%
0.00%

0.00%
0.00%
0.00%
0.72%


0.12%

0.10%

0.05%
% SW PWS
>MRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

14.81%
0.00%

0.00%
0.00%
2.04%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
16.78%
11.11%
0.00%

0.00%
0.00%
0.00%
0.00%


1.63%

0.45%

0.20%
% PWS
>MCL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.21%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% GW PWS
>MCL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.30%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% SW PWS
>MCL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
99% VALUE
(M9/L)
< 5.00
< 0.00
2.40
< 0.00


< 0.00
< 0.00

< 2.00

1.65
< 2.00

< 0.00
< 0.00
< 1.00
< 0.00
< 0.00
< 0.50
< 0.00

< 5.00
< 50.00
< 0.00
< 0.00
2.00
< 1.00
< 0.00

< 0.00
< 2.00
< 0.50
< 0.10


< 50.00

< 50.00

< 50.00
1.  Massachusetts data not included in "19 States" summary statistics for Methomyl.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory
analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL violation. An MCL
violation occurs when the MCL is exceeded by the average results f
The Maximum Contaminant Level (MCL) for Methomyl is 200 |jg/L.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                            Occurrence of Unregulated Contaminants in Public Water Systems
Table B.11 .b SDWIS/FED (Round 2) Data- Methomyl Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
25
29
1
527


747
74

33

55
175

2,633
1,270
374
11
480
296
590

717
1,187
128
1,151
481
33
952

7
1,907
432
327


14,642

12,659

12,604
TOTAL #
SAMPLES
34
58
1
1,762


2,221
341

137

179
464

4,004
5,910
1,039
28
711
383
611

4,141
1,959
165
2,667
1,931
172
5,707

46
4,849
738
724


40,982

32,156

31,977
#GW
SAMPLES
33
46
1
1,494


1,362
130

70

72
330

3,713
5,678
404
24
675
316
576

3,958
1,718
133
2,090
1,203
96
4,657

16
2,570
576
570


32,511

25,871

25,799
#SW
SAMPLES
1
12

268


859
211

67

107
134

291
232
635
4
36
67
35

183
241
32
577
728
76
1,050

30
2,279
162
154


8,471

6,285

6,178
% TOTAL
SAMPLES
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%

13.41%
0.00%

0.00%
0.02%
0.19%
0.00%
0.42%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
2.54%
0.58%
0.00%

0.00%
0.00%
0.00%
0.28%


0.20%

0.10%

0.03%
%GW
SAMPLES
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%

18.06%
0.00%

0.00%
0.02%
0.00%
0.00%
0.44%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.25%
0.00%
0.00%

0.00%
0.00%
0.00%
0.35%


0.07%

0.07%

0.02%
%sw
SAMPLES
>MRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

10.28%
0.00%

0.00%
0.00%
0.31%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
6.32%
1.32%
0.00%

0.00%
0.00%
0.00%
0.00%


0.71%

0.22%

0.05%
MIN VALUE
(H9/L)
< 0.20
< 0.00
2.40
< 0.00


< 0.00
< 0.00

< 0.05

< 0.20
< 0.50

< 0.00
< 0.00
< 0.29
< 0.00
< 0.00
< 0.00
< 0.00

< 0.00
< 0.05
< 0.00
< 0.00
< 0.00
< 0.00
< 0.00

< 0.00
< 2.00
< 0.00
< 0.00


< 0.00

< 0.00

< 0.00
99% VALUE
(H9/L)
< 5.00
< 0.00
2.40
< 0.00


< 0.00
< 0.00

< 2.00

1.65
< 2.00

< 0.00
< 0.00
< 1.00
< 0.00
< 0.00
< 0.50
< 0.00

< 5.00
< 50.00
< 0.00
< 0.00
2.00
< 1.00
< 0.00

< 0.00
< 2.00
< 0.50
< 0.10


< 50.00

< 50.00

< 50.00
MAX VALUE
(H9/L)
< 5.00
< 0.00
2.40
< 0.00


< 0.00
< 0.00

< 2.00

1.65
< 5.00

< 0.00
1.10
1.00
< 0.00
3.00
< 0.50
< 0.00

< 11.00
< 50.00
< 0.00
< 0.00
1000.00
0.37
< 0.00

< 0.00
< 2.00
< 1.00
0.20


1000.00

3.00

3.00
MIN
DETECTS
(M9/L)


2.40








1.00



1.10
0.29

1.60







0.40
0.37





0.10


0.10

0.10

0.10
MEDIAN
DETECTS
(M9/L)


2.40








1.65



1.10
0.65

2.90







2.00
0.37





0.15


1.65

1.65

1.00
1.  Massachusetts data not included in "19 States" summary statistics for Methomyl.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                   Occurrence of Unregulated Contaminants in Public Water Systems
Table B.11 .c SDWIS/FED (Round 2) Data- Methomyl Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL #
SAMPLES
34
58
1
1,762


2,221
341

137

179
464

4,004
5,910
1,039
28
711
383
611

4,141
1,959
165
2,667
1,931
172
5,707

46
4,849
738
724


40,982

32,156

31,977
TOTAL
UNIQUE PWS
25
29
1
527


747
74

33

55
175

2,633
1,270
374
11
480
296
590

717
1,187
128
1,151
481
33
952

7
1,907
432
327


14,642

12,659

12,604
# GW PWS
24
22
1
431


536
38

18

28
142

2,553
1,240
276
10
455
258
557

688
1,036
100
998
338
24
852

2
1,458
378
276


12,739

11,096

11,068
# SW PWS
1
7
0
96


211
36

15

27
33

80
30
98
1
25
38
33

29
151
28
153
143
9
100

5
449
54
51


1,903

1,563

1,536
% PWS
>MRL
0.00%
0.00%
100.00%
0.00%


0.00%
0.00%

0.00%

16.36%
0.00%

0.00%
0.08%
0.53%
0.00%
0.63%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
5.61%
3.03%
0.00%

0.00%
0.00%
0.00%
0.61%


0.31%

0.14%

0.07%
% GW PWS
>MRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

17.86%
0.00%

0.00%
0.08%
0.00%
0.00%
0.66%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.89%
0.00%
0.00%

0.00%
0.00%
0.00%
0.72%


0.12%

0.10%

0.05%
% SW PWS
>MRL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

14.81%
0.00%

0.00%
0.00%
2.04%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
16.78%
11.11%
0.00%

0.00%
0.00%
0.00%
0.00%

% PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.21%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


1.63%| 0.01%

0.45%

0.20%
0.00%

0.00%
% GW PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.30%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% SW PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
% PWS
>MCL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.21%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% GW PWS
>MCL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.30%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% SW PWS
>MCL
0.00%
0.00%
0.00%
0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
1. Massachusetts data not included in "19 States" summary statistics for Methomyl.
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL violation.  An MCL violation occurs when the MCL is
exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Methomyl is 200 Mg/L.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                   Occurrence of Unregulated Contaminants in Public Water Systems
Table B.12.a  SDWIS/FED (Round 2) Data- Metolachlor Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
1
17

536


750
70

38

54
683

2,650
1,264
538

495
296
592

716
2,202
1
1,135
459
15
940

10
426
391
599


14,878

13,007

12,953
# GW PWS
1
14

431


538
35

18

27
626

2,570
1,234
437

470
258
559

687
2,021
0
984
313
6
842

2
121
339
529


13,062

11,530

11,503
# SW PWS

3

105


212
35

20

27
57

80
30
101

25
38
33

29
181
1
151
146
9
98

8
305
52
70


1,816

1,477

1,450
% PWS
>MRL
0.00%
0.00%

0.00%


0.13%
1.43%

13.16%

14.81%
0.29%

0.19%
0.40%
4.28%

0.20%
0.00%
0.00%

0.00%
1.00%
0.00%
0.09%
11.98%
20.00%
0.00%

0.00%
9.39%
0.26%
0.00%


1.16%

0.89%

0.83%
% GW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
2.86%

0.00%

14.81%
0.16%

0.00%
0.32%
0.00%

0.21%
0.00%
0.00%

0.00%
0.05%
0.00%
0.10%
8.63%
50.00%
0.00%

0.00%
1.65%
0.29%
0.00%


0.35%

0.15%

0.11%
% SW PWS
>MRL
0.00%
0.00%

0.00%


0.47%
0.00%

25.00%

14.81%
1.75%

6.25%
3.33%
22.77%

0.00%
0.00%
0.00%

0.00%
11.60%
0.00%
0.00%
19.18%
0.00%
0.00%

0.00%
12.46%
0.00%
0.00%


6.99%

6.70%

6.55%
% PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
% GW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
% SW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
99% VALUE
(M9/L)
< 0.07
< 0.00

< 0.00


< 0.00
< 0.00

0.33

0.33
< 2.00

< 0.00
< 0.00
0.91

< 0.00
< 0.07
< 0.00

< 0.20
< 5.00
< 0.00
< 0.00
3.00
0.61
< 0.00

< 0.00
0.67
< 0.00
< 0.00


< 5.00

< 5.00

< 5.00
1.  Massachusetts data not included in "19 States" summary statistics for Metolachlor.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory
analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Metolachlor is 70 |jg/L. This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                            Occurrence of Unregulated Contaminants in Public Water Systems
Table B.12.b SDWIS/FED (Round 2) Data- Metolachlor Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
1
17

536


750
70

38

54
683

2,650
1,264
538

495
296
592

716
2,202
1
1,135
459
15
940

10
426
391
599


14,878

13,007

12,953
TOTAL #
SAMPLES
3
23

1,610


2,230
317

156

182
1,135

4,162
5,985
1,798

730
384
612

4,288
5,386
1
2,528
2,008
188
5,692

50
1,545
612
1,169


42,794

34,112

33,930
#GW
SAMPLES
3
19

1,225


1,365
116

65

72
913

3,780
5,706
780

694
317
577

4,094
4,901
0
1,972
1,156
82
4,699

16
194
483
967


34,196

27,723

27,651
#SW
SAMPLES
0
4

385


865
201

91

110
222

382
279
1,018

36
67
35

194
485
1
556
852
106
993

34
1,351
129
202


8,598

6,389

6,279
% TOTAL
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.04%
0.63%

7.69%

8.79%
0.18%

0.17%
0.37%
2.34%

0.14%
0.00%
0.00%

0.00%
0.48%
0.00%
0.04%
7.32%
3.72%
0.00%

0.00%
4.79%
0.16%
0.00%


0.84%

0.62%

0.57%
%GW
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.00%
1.72%

0.00%

15.28%
0.11%

0.00%
0.33%
0.00%

0.14%
0.00%
0.00%

0.00%
0.02%
0.00%
0.05%
6.49%
8.54%
0.00%

0.00%
2.58%
0.21%
0.00%


0.36%

0.17%

0.13%
%sw
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.12%
0.00%

13.19%

4.55%
0.45%

1.83%
1.08%
4.13%

0.00%
0.00%
0.00%

0.00%
5.15%
0.00%
0.00%
8.45%
0.00%
0.00%

0.00%
5.11%
0.00%
0.00%


2.76%

2.58%

2.55%
MIN VALUE
(H9/L)
< 0.07
< 0.00

< 0.00


< 0.00
< 0.00

< 0.01

< 0.20
< 0.05

< 0.00
< 0.00
< 0.50

< 0.00
< 0.00
< 0.00

< 0.03
< 0.01
< 0.00
< 0.00
< 0.00
< 0.00
< 0.00

< 0.00
< 0.10
< 0.00
< 0.00


< 0.00

< 0.00

< 0.00
99% VALUE
(H9/L)
< 0.07
< 0.00

< 0.00


< 0.00
< 0.00

0.33

0.33
< 2.00

< 0.00
< 0.00
0.91

< 0.00
< 0.07
< 0.00

< 0.20
< 5.00
< 0.00
< 0.00
3.00
0.61
< 0.00

< 0.00
0.67
< 0.00
< 0.00


< 5.00

< 5.00

< 5.00
MAX VALUE
(H9/L)
< 0.07
< 0.00

< 0.00


0.60
4.40

0.70

0.33
1.58

6.00
2.00
13.80

0.70
< 0.07
< 0.00

< 0.20
10.10
< 0.00
1.00
40.00
0.75
< 0.00

< 0.00
7.10
0.10
< 0.00


40.00

13.80

13.80
MIN
DETECTS
(M9/L)






0.60
0.59

0.01

0.33
1.07

1.00
0.50
0.50

0.70




0.20

1.00
0.10
0.17



0.10
0.10



0.01

0.01

0.01
MEDIAN
DETECTS
(M9/L)






0.60
2.50

0.15

0.33
1.33

2.00
0.80
0.84

0.70




1.20

1.00
1.00
0.33



0.30
0.10



1.00

0.57

0.61
1.  Massachusetts data not included in "19 States" summary statistics for Metolachlor.
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                     Occurrence of Unregulated Contaminants in Public Water Systems
Table B.12.C SDWIS/FED (Round 2) Data- Metolachlor Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL #
SAMPLES
3
23

1,610


2,230
317

156

182
1,135

4,162
5,985
1,798

730
384
612

4,288
5,386
1
2,528
2,008
188
5,692

50
1,545
612
1,169


42,794

34,112

33,930
TOTAL
UNIQUE PWS
1
17

536


750
70

38

54
683

2,650
1,264
538

495
296
592

716
2,202
1
1,135
459
15
940

10
426
391
599


14,878

13,007

12,953
# GW PWS
1
14

431


538
35

18

27
626

2,570
1,234
437

470
258
559

687
2,021
0
984
313
6
842

2
121
339
529


13,062

11,530

11,503
# SW PWS

3

105


212
35

20

27
57

80
30
101

25
38
33

29
181
1
151
146
9
98

8
305
52
70


1,816

1,477

1,450
% PWS
>MRL
0.00%
0.00%

0.00%


0.13%
1 .43%

13.16%

14.81%
0.29%

0.19%
0.40%
4.28%

0.20%
0.00%
0.00%

0.00%
1 .00%
0.00%
0.09%
1 1 .98%
20.00%
0.00%

0.00%
9.39%
0.26%
0.00%


1.16%

0.89%

0.83%
% GW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
2.86%

0.00%

14.81%
0.16%

0.00%
0.32%
0.00%

0.21%
0.00%
0.00%

0.00%
0.05%
0.00%
0.10%
8.63%
50.00%
0.00%

0.00%
1.65%
0.29%
0.00%


0.35%

0.15%

0.11%
% SW PWS
>MRL
0.00%
0.00%

0.00%


0.47%
0.00%

25.00%

14.81%
1 .75%

6.25%
3.33%
22.77%

0.00%
0.00%
0.00%

0.00%
1 1 .60%
0.00%
0.00%
19.18%
0.00%
0.00%

0.00%
1 2.46%
0.00%
0.00%

%PWS
> 1/2 HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.22%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


6.99%
0.01%

6.70%

6.55%
0.00%

0.00%
% GW PWS
> 1/2 HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.32%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% SW PWS
> 1/2 HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
% PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
% GW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
% SW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
1.  Massachusetts data not included in "19 States" summary statistics for Metolachlor.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Metolachlor is 70 |jg/L. This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                   Occurrence of Unregulated Contaminants in Public Water Systems
Table B.13.a  SDWIS/FED (Round 2)  Data- Metribuzin Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
1
20

536


750
69

418

56
684

2,650
1,264
538

623
296
557

715
2,178
107
1,135
358
15
940

7
426
390
600


15,333

13,568

13,512
# GW PWS
1
17

431


538
35

204

29
627

2,570
1,234
437

567
258
524

686
2,017
82
984
231
6
842

2
121
338
530


13,311

11,862

11,833
# SW PWS
0
3

105


212
34

214

27
57

80
30
101

56
38
33

29
161
25
151
127
9
98

5
305
52
70


2,022

1,706

1,679
% PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

14.29%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
9.50%
0.00%
0.00%

0.00%
0.00%
0.00%
0.17%


0.28%

0.07%

0.01%
% GW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

13.79%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
5.63%
0.00%
0.00%

0.00%
0.00%
0.00%
0.19%


0.14%

0.04%

0.01%
% SW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

14.81%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
16.54%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


1.24%

0.23%

0.00%
% PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
% GW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
% SW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
99% VALUE
(M9/L)
< 0.09
< 0.00

< 0.00


< 0.00
< 0.00

< 10.00

2.00
< 0.30

< 0.00
< 0.00
< 0.50

< 0.00
< 0.02
< 0.00

< 0.60
< 2.00
< 0.00
< 0.00
3.00
< 0.53
< 0.00

< 0.00
< 0.20
< 0.00
< 0.00


< 2.00

< 2.00

< 2.00
1.  Massachusetts data not included in "19 States" summary statistics for Metribuzin.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory
analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Metribuzin is 91 |jg/L. This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                             Occurrence of Unregulated Contaminants in Public Water Systems
Table B.13.b  SDWIS/FED (Round 2) Data- Metribuzin Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
1
20

536


750
69

418

56
684

2,650
1,264
538

623
296
557

715
2,178
107
1,135
358
15
940

7
426
390
600


15,333

13,568

13,512
TOTAL #
SAMPLES
3
26

1,610


2,229
314

1,945

187
1,101

4,162
5,985
1,798

872
383
576

4,288
4,039
129
2,529
1,488
188
5,703

46
1,481
608
1,166


42,856

34,694

34,507
#GW
SAMPLES
3
22

1,225


1,366
113

867

76
895

3,780
5,706
780

804
316
541

4,094
3,762
100
1,972
744
82
4,708

16
192
481
964


33,609

27,544

27,468
#SW
SAMPLES
0
4

385


863
201

1,078

111
206

382
279
1,018

68
67
35

194
277
29
557
744
106
995

30
1,289
127
202


9,247

7,150

7,039
% TOTAL
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

8.02%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
5.65%
0.00%
0.00%

0.00%
0.00%
0.00%
0.09%


0.23%

0.05%

0.00%
%GW
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

14.47%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
4.17%
0.00%
0.00%

0.00%
0.00%
0.00%
0.10%


0.13%

0.04%

0.00%
%sw
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

3.60%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
7.12%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.62%

0.06%

0.00%
MIN VALUE
(H9/L)
< 0.09
< 0.00

< 0.00


< 0.00
< 0.00

< 0.04

< 0.15
< 0.05

< 0.00
< 0.00
< 0.50

< 0.00
< 0.00
< 0.00

< 0.03
< 0.02
< 0.00
< 0.00
< 0.00
< 0.00
< 0.00

< 0.00
< 0.20
< 0.00
< 0.00


< 0.00

< 0.00

< 0.00
99% VALUE
(H9/L)
< 0.09
< 0.00

< 0.00


< 0.00
< 0.00

< 10.00

2.00
< 0.30

< 0.00
< 0.00
< 0.50

< 0.00
< 0.02
< 0.00

< 0.60
< 2.00
< 0.00
< 0.00
3.00
< 0.53
< 0.00

< 0.00
< 0.20
< 0.00
< 0.00


< 2.00

< 2.00

< 2.00
MAX VALUE
(H9/L)
< 0.09
< 0.00

< 0.00


< 0.00
< 0.00

< 1010.00

2.00
< 50.00

< 0.00
< 0.00
< 0.50

< 0.00
< 0.02
< 0.00

< 1.00
< 4.00
< 0.00
< 0.00
3.00
< 0.53
< 0.00

< 0.00
< 0.20
< 0.44
0.10


3.00

2.00

0.10
MIN
DETECTS
(M9/L)











1.10














0.10






0.10


0.10

0.10

0.10
MEDIAN
DETECTS
(M9/L)











1.10














1.00






0.10


1.00

1.10

0.10
1.  Massachusetts data not included in "19 States" summary statistics for Metribuzin.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                     Occurrence of Unregulated Contaminants in Public Water Systems
Table  B.13.c SDWIS/FED (Round 2) Data- Metribuzin Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES
TOTAL #
SAMPLES
3
26

1,610


2,229
314

1,945

187
1,101

4,162
5,985
1,798

872
383
576

4,288
4,039
129
2,529
1,488
188
5,703

46
1,481
608
1,166


42,856

34,694

34,507
TOTAL
UNIQUE PWS
1
20

536


750
69

418

56
684

2,650
1,264
538

623
296
557

715
2,178
107
1,135
358
15
940

7
426
390
600


15,333

13,568

13,512
#GWPWS
1
17

431


538
35

204

29
627

2,570
1,234
437

567
258
524

686
2,017
82
984
231
6
842

2
121
338
530


13,311

11,862

11,833
#SWPWS
0
3

105


212
34

214

27
57

80
30
101

56
38
33

29
161
25
151
127
9
98

5
305
52
70


2,022

1,706

1,679
% PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

14.29%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
9.50%
0.00%
0.00%

0.00%
0.00%
0.00%
0.17%


0.28%

0.07%

0.01%
% GW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

13.79%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
5.63%
0.00%
0.00%

0.00%
0.00%
0.00%
0.19%


0.14%

0.04%

0.01%
% SW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

14.81%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
16.54%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

% PWS
> 1/2 HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


1.24%| 0.00%

0.23%

0.00%
0.00%

0.00%
% GW PWS
> 1/2 HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
% SW PWS
> 1/2 HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
% PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
% GW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
% SW PWS
>HRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%

0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
1.  Massachusetts data not included in "19 States" summary statistics for Metribuzin.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Metribuzin is 91 |jg/L. This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                    Occurrence of Unregulated Contaminants in Public Water Systems
Table B.14.a  SDWIS/FED (Round 2) Data- Propachlor Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
1
10

536


750
70

33
1,363
53
685

2,650
1,264
538

535
296
596

708
1,216
48
1,146
304
15
941

7
426
389
598


15,178

12,103

12,050
# GW PWS
1
9

431


538
35

13
1,295
26
628

2,570
1,234
437

489
258
563

680
1,064
36
994
186
6
843

2
121
337
529


13,325

10,626

10,600
# SW PWS
0
1

105


212
35

20
68
27
57

80
30
101

46
38
33

28
152
12
152
118
9
98

5
305
52
69


1,853

1,477

1,450
% PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
9.43%
0.00%

0.00%
0.00%
0.00%

0.75%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
7.89%
6.67%
0.00%

0.00%
0.00%
0.00%
0.17%


0.23%

0.09%

0.05%
% GW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
1 1 .54%
0.00%

0.00%
0.00%
0.00%

0.20%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
2.15%
0.00%
0.00%

0.00%
0.00%
0.00%
0.19%


0.07%

0.05%

0.02%
% SW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
7.41%
0.00%

0.00%
0.00%
0.00%

6.52%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
16.95%
11.11%
0.00%

0.00%
0.00%
0.00%
0.00%


1.40%

0.41%

0.28%
% PWS
>MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.33%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% GW PWS
>MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
% SW PWS
>MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.85%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.05%

0.00%

0.00%
99% VALUE
(M9/L)
< 0.06
< 0.00

< 0.00


< 0.00
< 0.00

< 2.00
< 0.61
2.00
< 1.00

< 0.00
< 0.00
< 0.50

< 0.00
< 0.04
< 0.00

< 0.60
< 10.00
< 0.00
< 0.00
3.00
< 0.07
< 0.00

< 0.00
< 0.20
< 0.00
< 0.00


< 4.00

< 5.00

< 5.00
1.  Massachusetts data not included in "19 States" summary statistics for Propachlor.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory
analyses)

"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL violation. An MCL
violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as  required by the primacy States.
The Maximum Contaminant Level (MCL) for Propachlor is 90 (jg/L.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                             Occurrence of Unregulated Contaminants in Public Water Systems
Table B.14.b SDWIS/FED (Round 2) Data- Propachlor Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
1
10

536


750
70

33
1,363
53
685

2,650
1,264
538

535
296
596

708
1,216
48
1,146
304
15
941

7
426
389
598


15,178

12,103

12,050
TOTAL #
SAMPLES
3
10

1,610


2,231
315

141
3,333
159
1,108

4,162
5,985
1,798

778
383
616

4,139
2,075
52
2,645
1,099
188
5,731

46
1,475
612
1,163


41,857

30,718

30,559
#GW
SAMPLES
3
9

1,225


1,366
112

40
3,152
57
902

3,780
5,706
780

720
316
581

3,956
1,823
40
2,077
490
81
4,737

16
190
480
961


33,600

24,610

24,553
#SW
SAMPLES
0
1

385


865
203

101
181
102
206

382
279
1,018

58
67
35

183
252
12
568
609
107
994

30
1,285
132
202


8,257

6,108

6,006
% TOTAL
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
6.92%
0.00%

0.00%
0.00%
0.00%

0.64%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
4.46%
0.53%
0.00%

0.00%
0.00%
0.00%
0.09%


0.16%

0.06%

0.02%
%GW
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
15.79%
0.00%

0.00%
0.00%
0.00%

0.28%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.82%
0.00%
0.00%

0.00%
0.00%
0.00%
0.10%


0.05%

0.05%

0.01%
%sw
SAMPLES
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
1.96%
0.00%

0.00%
0.00%
0.00%

5.17%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
7.39%
0.93%
0.00%

0.00%
0.00%
0.00%
0.00%


0.62%

0.10%

0.07%
MIN VALUE
(H9/L)
< 0.06
< 0.00

< 0.00


< 0.00
< 0.00

< 0.04
< 0.61
< 0.20
< 0.05

< 0.00
< 0.00
< 0.50

< 0.00
< 0.00
< 0.00

< 0.02
< 0.05
< 0.00
< 0.00
< 0.00
< 0.00
< 0.00

< 0.00
< 0.20
< 0.00
< 0.00


< 0.00

< 0.00

< 0.00
99% VALUE
(H9/L)
< 0.06
< 0.00

< 0.00


< 0.00
< 0.00

< 2.00
< 0.61
2.00
< 1.00

< 0.00
< 0.00
< 0.50

< 0.00
< 0.04
< 0.00

< 0.60
< 10.00
< 0.00
< 0.00
3.00
< 0.07
< 0.00

< 0.00
< 0.20
< 0.00
< 0.00


< 4.00

< 5.00

< 5.00
MAX VALUE
(H9/L)
< 0.06
< 0.00

< 0.00


< 0.00
< 0.00

< 2.00
< 0.61
2.00
< 50.00

< 0.00
< 0.00
< 0.50

0.30
< 0.04
< 0.00

< 3.00
< 20.00
< 0.00
< 0.00
201000.00
< 0.11
< 0.01

< 0.00
< 0.20
< 0.50
2.50


201000.00

2.50

2.50
MIN
DETECTS
(M9/L)











1.00






0.10







0.10
0.11





2.50


0.10

0.10

0.10
MEDIAN
DETECTS
(M9/L)











2.00






0.10







1.00
0.11





2.50


1.00

1.00

0.11
1.  Massachusetts data not included in "19 States" summary statistics for Propachlor.
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                    Occurrence of Unregulated Contaminants in Public Water Systems
Table B.14.C SDWIS/FED (Round 2) Data- Propachlor Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL #
SAMPLES
3
10

1,610


2,231
315

141
3,333
159
1,108

4,162
5,985
1,798

778
383
616

4,139
2,075
52
2,645
1,099
188
5,731

46
1,475
612
1,163


41,857

30,718

30,559
TOTAL
UNIQUE PWS
1
10

536


750
70

33
1,363
53
685

2,650
1,264
538

535
296
596

708
1,216
48
1,146
304
15
941

7
426
389
598


15,178

12,103

12,050
# GW PWS
1
9

431


538
35

13
1,295
26
628

2,570
1,234
437

489
258
563

680
1,064
36
994
186
6
843

2
121
337
529


13,325

10,626

10,600
# SW PWS
0
1

105


212
35

20
68
27
57

80
30
101

46
38
33

28
152
12
152
118
9
98

5
305
52
69


1,853

1,477

1,450
% PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
9.43%
0.00%

0.00%
0.00%
0.00%

0.75%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
7.89%
6.67%
0.00%

0.00%
0.00%
0.00%
0.17%


0.23%

0.09%

0.05%
% GW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
1 1 .54%
0.00%

0.00%
0.00%
0.00%

0.20%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
2.15%
0.00%
0.00%

0.00%
0.00%
0.00%
0.19%


0.07%

0.05%

0.02%
% SW PWS
>MRL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
7.41%
0.00%

0.00%
0.00%
0.00%

6.52%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
16.95%
11.11%
0.00%

0.00%
0.00%
0.00%
0.00%

% PWS
> 1/2 MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.33%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


1.40%| 0.01%

0.41%

0.28%
0.00%

0.00%
% GW PWS
> 1/2 MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
% SW PWS
> 1/2 MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.85%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.05%

0.00%

0.00%
% PWS
>MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.33%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.01%

0.00%

0.00%
% GW PWS
>MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.00%

0.00%

0.00%
% SW PWS
>MCL
0.00%
0.00%

0.00%


0.00%
0.00%

0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.85%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%


0.05%

0.00%

0.00%
1.  Massachusetts data not included in "19 States" summary statistics for Propachlor.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL violation. An MCL violation occurs when the MCL is
exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Propachlor is 90 Mg/L.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                               Occurrence of Unregulated Contaminants in Public Water Systems
Table B.15.a SDWIS/FED (Round 2) Data- Bromobenzene Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL
UNIQUE PWS
22
625

407
121
14
831
86
117
431
1,310
418
976
744
2,735
1,558
1,413

1,785
296

16
718
2,232
791
1,088

116
908

77
4,414
558
2,547
200

27,554

24,125
# GW PWS
21
481

319
106
11
619
44
107
207
1,241
344
920
676
2,644
1,528
1,297

1,592
258

14
690
2,050
541
937

104
807

30
3,826
495
2,428
197

24,534

21,461
# SW PWS
1
144

88
15
3
212
42
10
224
69
74
56
68
91
30
116

193
38

2
28
182
250
151

12
101

47
588
63
119
3

3,020

2,664
% PWS
>MRL
0.00%
0.32%

0.00%
0.00%
0.00%
0.24%
0.00%
0.00%
0.23%
0.00%
0.00%
0.10%
0.00%
0.00%
0.19%
0.07%

0.56%
0.00%

0.00%
0.14%
0.18%
0.25%
0.18%

0.00%
0.00%

1.30%
0.05%
0.00%
0.00%
0.00%

0.12%

0.13%
% GW PWS
>MRL
0.00%
0.21%

0.00%
0.00%
0.00%
0.32%
0.00%
0.00%
0.48%
0.00%
0.00%
0.11%
0.00%
0.00%
0.13%
0.08%

0.50%
0.00%

0.00%
0.14%
0.15%
0.37%
0.21%

0.00%
0.00%

3.33%
0.03%
0.00%
0.00%
0.00%

0.11%

0.12%
% SW PWS
>MRL
0.00%
0.69%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
3.33%
0.00%

1.04%
0.00%

0.00%
0.00%
0.55%
0.00%
0.00%

0.00%
0.00%

0.00%
0.17%
0.00%
0.00%
0.00%

0.20%

0.23%
% PWS
>HRL














% GW PWS
>HRL














% SW PWS
>HRL














There is no Health Reference Level (HRL),
Maximum Contaminant Level (MCL), or
Health Advisory Level (HAL) for
Bromobenzene.






















































99% VALUE
(M9/L)
< 1.00
< 0.00

< 0.08
< 1.00
< 0.50
< 0.00
< 0.00
< 2.00
< 2.50
< 0.50
< 0.50
< 0.50
< 0.00
< 0.00
< 0.20
< 1.00

< 0.00
< 0.50

< 1.00
< 1.00
< 0.50
< 0.00
< 0.00

< 1.00
< 0.50

< 0.00
< 1.00
< 0.00
< 0.00
< 4.00

< 1.00

< 1.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for
laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                           Occurrence of Unregulated Contaminants in Public Water Systems
Table B.15.b SDWIS/FED (Round 2) Data- Bromobenzene Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL
UNIQUE PWS
22
625

407
121
14
831
86
117
431
1,310
418
976
744
2,735
1,558
1,413

1,785
296

16
718
2,232
791
1,088

116
908

77
4,414
558
2,547
200

27,554

24,125
TOTAL #
SAMPLES
32
3,562

1,352
245
80
2,640
2,260
209
1,972
4,055
1,821
4,860
3,562
6,966
6,864
3,773

3,392
382

19
4,817
17,789
4,734
2,702

426
3,988

532
16,864
1,803
9,551
360

111,612

98,029
#GW
SAMPLES
31
2,625

1,078
173
61
1,689
918
193
898
3,451
1,370
4,310
3,158
6,142
6,678
3,275

2,905
316

16
4,599
16,433
3,490
2,120

341
3,427

191
12,203
1,598
8,666
356

92,711

82,296
#SW
SAMPLES
1
937

274
72
19
951
1,342
16
1,074
604
451
550
404
824
186
498

487
66

3
218
1,356
1,244
582

85
561

341
4,661
205
885
4

18,901

15,733
% TOTAL
SAMPLES
>MRL
0.00%
0.06%

0.00%
0.00%
0.00%
0.08%
0.00%
0.00%
0.05%
0.00%
0.00%
0.02%
0.00%
0.00%
0.04%
0.03%

0.35%
0.00%

0.00%
0.06%
0.02%
0.04%
0.07%

0.00%
0.00%

0.19%
0.01%
0.00%
0.00%
0.00%

0.03%

0.04%
%GW
SAMPLES
>MRL
0.00%
0.04%

0.00%
0.00%
0.00%
0.12%
0.00%
0.00%
0.11%
0.00%
0.00%
0.02%
0.00%
0.00%
0.03%
0.03%

0.34%
0.00%

0.00%
0.07%
0.02%
0.06%
0.09%

0.00%
0.00%

0.52%
0.01%
0.00%
0.00%
0.00%

0.03%

0.04%
%SW
SAMPLES
>MRL
0.00%
0.11%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.54%
0.00%

0.41%
0.00%

0.00%
0.00%
0.07%
0.00%
0.00%

0.00%
0.00%

0.00%
0.02%
0.00%
0.00%
0.00%

0.03%

0.04%
MIN VALUE
(M9/L)
< 0.50
< 0.00

< 0.00
< 0.20
< 0.20
< 0.00
< 0.00
< 0.10
< 0.00
< 0.50
< 0.00
< 0.10
< 0.00
< 0.00
< 0.00
< 0.00

< 0.00
< 0.00

< 0.10
< 0.50
< 0.50
< 0.00
< 0.00

< 0.00
< 0.00

< 0.00
< 1.00
< 0.00
< 0.00
< 0.00

< 0.00

< 0.00
99% VALUE
(M9/L)
< 1.00
< 0.00

< 0.08
< 1.00
< 0.50
< 0.00
< 0.00
< 2.00
< 2.50
< 0.50
< 0.50
< 0.50
< 0.00
< 0.00
< 0.20
< 1.00

< 0.00
< 0.50

< 1.00
< 1.00
< 0.50
< 0.00
< 0.00

< 1.00
< 0.50

< 0.00
< 1.00
< 0.00
< 0.00
< 4.00

< 1.00

< 1.00
MAX VALUE
(M9/L)
< 1.00
0.20

< 0.08
< 1.00
< 0.50
0.19
< 0.00
< 2.00
0.68
< 0.50
< 0.50
0.10
< 0.00
< 0.00
2.10
0.40

4.20
< 0.50

< 1.00
1.50
4.69
0.80
3.00

< 1.00
< 0.50

0.50
2.00
< 0.50
< 0.00
< 4.00

4.69

4.69
MIN
DETECTS
(M9/L)

0.10




0.05


0.68


0.10


0.60
0.40

0.50



0.53
0.50
0.50
0.80




0.50
1.60




0.05

0.05
MEDIAN
DETECTS
(M9/L)

0.15




0.12


0.68


0.10


0.70
0.40

0.50



0.80
0.60
0.65
1.90




0.50
1.80




0.50

0.50
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                               Occurrence of Unregulated Contaminants in Public Water Systems
Table B.15.C SDWIS/FED (Round 2) Data- Bromobenzene Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL #
SAMPLES
32
3,562

1,352
245
80
2,640
2,260
209
1,972
4,055
1,821
4,860
3,562
6,966
6,864
3,773

3,392
382

19
4,817
17,789
4,734
2,702

426
3,988

532
16,864
1,803
9,551
360

111,612

98,029
TOTAL
UNIQUE PWS
22
625

407
121
14
831
86
117
431
1,310
418
976
744
2,735
1,558
1,413

1,785
296

16
718
2,232
791
1,088

116
908

77
4,414
558
2,547
200

27,554

24,125
# GW PWS
21
481

319
106
11
619
44
107
207
1,241
344
920
676
2,644
1,528
1,297

1,592
258

14
690
2,050
541
937

104
807

30
3,826
495
2,428
197

24,534

21,461
# SW PWS
1
144

88
15
3
212
42
10
224
69
74
56
68
91
30
116

193
38

2
28
182
250
151

12
101

47
588
63
119
3

3,020

2,664
% PWS
>MRL
0.00%
0.32%

0.00%
0.00%
0.00%
0.24%
0.00%
0.00%
0.23%
0.00%
0.00%
0.10%
0.00%
0.00%
0.19%
0.07%

0.56%
0.00%

0.00%
0.14%
0.18%
0.25%
0.18%

0.00%
0.00%

1.30%
0.05%
0.00%
0.00%
0.00%

0.12%

0.13%
% GW PWS
>MRL
0.00%
0.21%

0.00%
0.00%
0.00%
0.32%
0.00%
0.00%
0.48%
0.00%
0.00%
0.11%
0.00%
0.00%
0.13%
0.08%

0.50%
0.00%

0.00%
0.14%
0.15%
0.37%
0.21%

0.00%
0.00%

3.33%
0.03%
0.00%
0.00%
0.00%

0.11%

0.12%
% SW PWS
>MRL
0.00%
0.69%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
3.33%
0.00%

1.04%
0.00%

0.00%
0.00%
0.55%
0.00%
0.00%

0.00%
0.00%

0.00%
0.17%
0.00%
0.00%
0.00%
% PWS
> 1/2 HRL
















% GW PWS
> 1/2 HRL
















% SW PWS
> 1/2 HRL
















% PWS
>HRL
















% GW PWS
>HRL
















% SW PWS
>HRL
















There is no Health Reference Level (HRL), Maximum Contaminant Level (MCL), or Health
Advisory Level (HAL) for Bromobenzene.

















0.20%|

0.23%





































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                  Occurrence of Unregulated Contaminants in Public Water Systems
Table B.16.a SDWIS/FED (Round 2) Data- Bromochloromethane Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
22
625

407
65
14
831
84
117
365
1,310
418
976
744
2,735
1,558
1,412
2
1,778
296

7
717
2,232
791
17

114
237
27

4,412
2
2,546
191

25,052

22,974

22,974
# GW PWS
21
481

319
57
11
619
43
107
185
1,241
344
920
676
2,644
1,528
1,297
2
1,587
258

7
689
2,050
541
15

102
216
19

3,825
1
2,427
188

22,420

20,507

20,507
# SW PWS
1
144

88
8
3
212
41
10
180
69
74
56
68
91
30
115

191
38


28
182
250
2

12
21
8

587
1
119
3

2,632

2,467

2,467
% PWS
>MRL
0.00%
2.24%

0.00%
0.00%
0.00%
0.84%
2.38%
0.00%
0.00%
0.00%
0.72%
0.41%
0.00%
0.11%
0.58%
0.00%
100.00%
0.79%
0.00%

0.00%
1.39%
0.76%
0.25%
0.00%

0.88%
0.00%
0.00%

0.39%
50.00%
0.20%
0.00%

0.44%

0.46%

0.46%
% GW PWS
>MRL
0.00%
0.42%

0.00%
0.00%
0.00%
0.65%
0.00%
0.00%
0.00%
0.00%
0.29%
0.33%
0.00%
0.04%
0.46%
0.00%
100.00%
0.69%
0.00%

0.00%
1.16%
0.73%
0.18%
0.00%

0.98%
0.00%
0.00%

0.18%
100.00%
0.21%
0.00%

0.31%

0.32%

0.32%
% SW PWS
>MRL
0.00%
8.33%

0.00%
0.00%
0.00%
1.42%
4.88%
0.00%
0.00%
0.00%
2.70%
1.79%
0.00%
2.20%
6.67%
0.00%

1.57%
0.00%


7.14%
1.10%
0.40%
0.00%

0.00%
0.00%
0.00%

1.70%
0.00%
0.00%
0.00%

1.60%

1.62%

1.62%
% PWS
>MCL
0.00%
0.64%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
50.00%
0.06%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.05%
0.00%
0.00%
0.00%

0.03%

0.03%

0.03%
% GW PWS
>MCL
0.00%
0.83%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.03%
0.00%
0.00%
0.00%

0.02%

0.02%

0.02%
% SW PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.52%
0.00%


0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.17%
0.00%
0.00%
0.00%

0.11%

0.08%

0.08%
99% VALUE
(M9/L)
< 1.00
< 0.00

< 0.13
< 1.00
< 0.50
< 0.00
< 0.00
< 2.00
< 2.50
< 0.50
< 0.50
< 0.50
< 0.00
< 0.00
< 0.50
< 1.00
11.90
< 0.00
< 0.50

< 1.00
< 1.00
< 0.50
< 0.00
< 0.00

< 1.00
< 0.50
< 0.50

< 1.00
0.60
< 0.00
< 0.30

< 1.00

< 1.00

< 1.00
1.  New Hampshire data not included in "19 States" summary statistics for Bromochloromethane.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for
laboratory analyses)

"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL violation. An
MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Bromochloromethane is 10 |jg/L.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                          Occurrence of Unregulated Contaminants in Public Water Systems
Table B.16.b SDWIS/FED (Round 2) Data- Bromochloromethane Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL
UNIQUE PWS
22
625

407
65
14
831
84
117
365
1,310
418
976
744
2,735
1,558
1,412
2
1,778
296

7
717
2,232
791
17

114
237
27

4,412
2
2,546
191

25,052

22,974

22,974
TOTAL #
SAMPLES
32
3,532

1,352
128
79
2,642
1,949
210
1,565
4,055
1,821
4,857
3,554
6,970
6,864
3,780
3
3,357
381

7
4,281
17,789
4,734
20

426
425
35
0
16,804
3
9,534
349

101,538

94,263

94,263
#GW
SAMPLES
31
2,591

1,078
108
60
1,692
842
194
749
3,451
1,369
4,306
3,144
6,146
6,678
3,284
3
2,889
315

7
4,079
16,433
3,490
18

340
385
26

12,141
2
8,649
345

84,845

79,391

79,391
#SW
SAMPLES
1
941

274
20
19
950
1,107
16
816
604
452
551
410
824
186
496
0
468
66

0
202
1,356
1,244
2

86
40
9

4,663
1
885
4

16,693

14,872

14,872
% TOTAL
SAMPLES
>MRL
0.00%
0.42%

0.00%
0.00%
0.00%
0.34%
0.15%
0.00%
0.00%
0.00%
0.22%
0.16%
0.00%
0.04%
0.13%
0.00%
100.00%
0.48%
0.00%

0.00%
0.23%
0.10%
0.04%
0.00%

0.23%
0.00%
0.00%

0.13%
33.33%
0.05%
0.00%

0.13%

0.13%

0.13%
%GW
SAMPLES
>MRL
0.00%
0.12%

0.00%
0.00%
0.00%
0.35%
0.00%
0.00%
0.00%
0.00%
0.07%
0.07%
0.00%
0.02%
0.10%
0.00%
100.00%
0.45%
0.00%

0.00%
0.20%
0.09%
0.03%
0.00%

0.29%
0.00%
0.00%

0.07%
50.00%
0.06%
0.00%

0.09%

0.09%

0.09%
%sw
SAMPLES
>MRL
0.00%
1.28%

0.00%
0.00%
0.00%
0.32%
0.27%
0.00%
0.00%
0.00%
0.66%
0.91%
0.00%
0.24%
1.08%
0.00%
0.00%
0.64%
0.00%

0.00%
0.99%
0.15%
0.08%
0.00%

0.00%
0.00%
0.00%

0.30%
0.00%
0.00%
0.00%

0.31%

0.33%

0.33%
MIN VALUE
(H9/L)
< 0.50
< 0.00

< 0.00
< 0.40
< 0.20
< 0.00
< 0.00
< 0.11
< 0.40
< 0.50
< 0.00
< 0.10
< 0.00
< 0.00
< 0.00
< 0.00
8.50
< 0.00
< 0.00

< 0.32
< 0.50
< 0.50
< 0.00
< 0.00

< 0.00
< 0.50
< 0.50

< 0.70
< 0.50
< 0.00
< 0.00

< 0.00

< 0.00

< 0.00
99% VALUE
(H9/L)
< 1.00
< 0.00

< 0.13
< 1.00
< 0.50
< 0.00
< 0.00
< 2.00
< 2.50
< 0.50
< 0.50
< 0.50
< 0.00
< 0.00
< 0.50
< 1.00
11.90
< 0.00
< 0.50

< 1.00
< 1.00
< 0.50
< 0.00
< 0.00

< 1.00
< 0.50
< 0.50

< 1.00
0.60
< 0.00
< 0.30

< 1.00

< 1.00

< 1.00
MAX VALUE
(H9/L)
< 1.00
33.40

< 0.13
< 1.00
< 0.50
4.40
3.10
< 2.00
< 2.50
< 0.50
5.49
1.20
< 0.00
0.60
5.00
< 1.00
11.90
20.00
< 0.50

< 1.00
1.90
6.20
0.80
< 0.00

1.00
< 0.50
< 0.50

27.90
0.60
0.20
< 0.30

33.40

33.40

33.40
MIN
DETECTS
(M9/L)

0.00




0.20
2.50



2.20
0.10

0.50
0.60

8.50
0.50



0.60
0.56
0.70


1.00



0.70
0.60
0.10


0.00

0.00

0.00
MEDIAN
DETECTS
(M9/L)

3.30




0.60
2.80



3.95
0.20

0.50
0.90

9.00
0.50



1.15
2.10
0.75


1.00



1.90
0.60
0.10


1.10

1.00

1.00
1. New Hampshire data not included in "19 States" summary statistics for Bromochloromethane.
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                   Occurrence of Unregulated Contaminants in Public Water Systems
Table B.16.C SDWIS/FED (Round 2) Data- Bromochloromethane Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES

19 STATES1
TOTAL #
SAMPLES
32
3,532

1,352
128
79
2,642
1,949
210
1,565
4,055
1,821
4,857
3,554
6,970
6,864
3,780
3
3,357
381

7
4,281
17,789
4,734
20

426
425
35

16,804
3
9,534
349

101,538

94,263

94,263
TOTAL
UNIQUE PWS
22
625

407
65
14
831
84
117
365
1,310
418
976
744
2,735
1,558
1,412
2
1,778
296

7
717
2,232
791
17

114
237
27

4,412
2
2,546
191

25,052

22,974

22,974
# GW PWS
21
481

319
57
11
619
43
107
185
1,241
344
920
676
2,644
1,528
1,297
2
1,587
258

7
689
2,050
541
15

102
216
19

3,825
1
2,427
188

22,420

20,507

20,507
# SW PWS
1
144

88
8
3
212
41
10
180
69
74
56
68
91
30
115
0
191
38

0
28
182
250
2

12
21
8

587
1
119
3

2,632

2,467

2,467
% PWS
>MRL
0.00%
2.24%

0.00%
0.00%
0.00%
0.84%
2.38%
0.00%
0.00%
0.00%
0.72%
0.41%
0.00%
0.11%
0.58%
0.00%
100.00%
0.79%
0.00%

0.00%
1.39%
0.76%
0.25%
0.00%

0.88%
0.00%
0.00%

0.39%
50.00%
0.20%
0.00%

0.44%

0.46%

0.46%
% GW PWS
>MRL
0.00%
0.42%

0.00%
0.00%
0.00%
0.65%
0.00%
0.00%
0.00%
0.00%
0.29%
0.33%
0.00%
0.04%
0.46%
0.00%
100.00%
0.69%
0.00%

0.00%
1.16%
0.73%
0.18%
0.00%

0.98%
0.00%
0.00%

0.18%
100.00%
0.21%
0.00%

0.31%

0.32%

0.32%
% SW PWS
>MRL
0.00%
8.33%

0.00%
0.00%
0.00%
1.42%
4.88%
0.00%
0.00%
0.00%
2.70%
1.79%
0.00%
2.20%
6.67%
0.00%
0.00%
1.57%
0.00%

0.00%
7.14%
1.10%
0.40%
0.00%

0.00%
0.00%
0.00%

1.70%
0.00%
0.00%
0.00%

1.60%

1.62%

1.62%
% PWS
> 1/2 MCL
0.00%
0.96%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.24%
0.00%
0.00%
0.00%
0.00%
0.00%
100.00%
0.06%
0.00%

0.00%
0.00%
0.13%
0.00%
0.00%

0.00%
0.00%
0.00%

0.05%
0.00%
0.00%
0.00%

0.06%

0.06%

0.06%
% GW PWS
> 1/2 MCL
0.00%
1.25%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.29%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.05%
0.00%
0.00%

0.00%
0.00%
0.00%

0.03%
0.00%
0.00%
0.00%

0.04%

0.04%

0.04%
% SW PWS
> 1/2 MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.52%
0.00%

0.00%
0.00%
1.10%
0.00%
0.00%

0.00%
0.00%
0.00%

0.17%
0.00%
0.00%
0.00%

0.23%

0.16%

0.16%
% PWS
>MCL
0.00%
0.64%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
50.00%
0.06%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.05%
0.00%
0.00%
0.00%

0.03%

0.03%

0.03%
% GW PWS
>MCL
0.00%
0.83%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.03%
0.00%
0.00%
0.00%

0.02%

0.02%

0.02%
% SW PWS
>MCL
0.00%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.52%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%

0.00%
0.00%
0.00%

0.17%
0.00%
0.00%
0.00%

0.11%

0.08%

0.08%
1.  New Hampshire data not included in "19 States" summary statistics for Bromochloromethane.
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL violation. An MCL violation occurs when the MCL is
exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Bromochloromethane is 10 Mg/L.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                Occurrence of Unregulated Contaminants in Public Water Systems
Table B.17.a SDWIS/FED (Round 2) Data- Bromodichloromethane Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL
UNIQUE PWS
22
625
43
402
123
34
830
86
120
430
1,310
443
38
744
2,726
1,558
1,413
165
1,763
296
685
16
715
2,250
791
1,087

102
853
27
77
4,412
590
2,548
219

27,543

23,858
# GW PWS
21
481
9
315
107
21
618
44
110
208
1,241
355
34
676
2,631
1,528
1,297
162
1,574
258
651
14
687
2,054
541
936

90
789
19
30
3,825
505
2,393
198

24,422

21,152
# SW PWS
1
144
34
87
16
13
212
42
10
222
69
88
4
68
95
30
116
3
189
38
34
2
28
196
250
151

12
64
8
47
587
85
155
21

3,121

2,706
% PWS
>MRL
13.64%
35.20%
100.00%
57.46%
11.38%
55.88%
55.90%
74.42%
22.50%
74.42%
0.00%
25.73%
15.79%
17.88%
8.33%
19.00%
21.02%
100.00%
19.68%
51.01%
7.30%
12.50%
11.33%
48.13%
67.13%
20.06%

2.94%
11.25%
48.15%
62.34%
0.16%
15.59%
18.13%
11.42%

21.25%

21.97%
% GW PWS
>MRL
9.52%
18.92%
100.00%
50.79%
4.67%
52.38%
44.34%
59.09%
17.27%
57.69%
0.00%
13.24%
8.82%
11.39%
5.66%
17.41%
14.80%
100.00%
12.64%
46.90%
3.99%
0.00%
9.61%
43.57%
54.53%
10.68%

1.11%
9.63%
31.58%
33.33%
0.08%
8.12%
13.75%
3.03%

15.51%

16.14%
% SW PWS
>MRL
100.00%
89.58%
100.00%
81.61%
56.25%
61.54%
89.62%
90.48%
80.00%
90.09%
0.00%
76.14%
75.00%
82.35%
82.11%
100.00%
90.52%
100.00%
78.31%
78.95%
70.59%
100.00%
53.57%
95.92%
94.40%
78.15%

16.67%
31.25%
87.50%
80.85%
0.68%
60.00%
85.81%
90.48%

66.16%

67.52%
% PWS
>HRL
0.00%
0.64%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.70%
0.00%
0.00%
0.00%
0.00%
0.07%
0.00%
0.07%
0.00%
0.06%
0.34%
0.00%
0.00%
0.00%
0.09%
0.51%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.51%
0.00%
0.00%

0.08%

0.08%
% GW PWS
>HRL
0.00%
0.21%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.48%
0.00%
0.00%
0.00%
0.00%
0.08%
0.00%
0.00%
0.00%
0.06%
0.39%
0.00%
0.00%
0.00%
0.10%
0.37%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.04%

0.05%
% SW PWS
>HRL
0.00%
2.08%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.90%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.86%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.80%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
3.53%
0.00%
0.00%

0.35%

0.30%
99% VALUE
(M9/L)
47.40
26.00
15.50
14.50
37.00
23.70
14.00
11.00
18.00
28.00
< 0.24
12.00
10.80
5.50
21.70
5.80
35.30
32.40
12.10
45.20
7.60
4.80
2.10
15.30
30.60
9.70

< 1.00
3.96
18.40
13.00
< 0.50
5.00
1.10
8.20

18.10

18.80
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for
laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Bromodichloromethane is 60 ug/L.  This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                          Occurrence of Unregulated Contaminants in Public Water Systems
Table B.17.b SDWIS/FED (Round 2) Data- Bromodichloromethane Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL
UNIQUE PWS
22
625
43
402
123
34
830
86
120
430
1,310
443
38
744
2,726
1,558
1,413
165
1,763
296
685
16
715
2,250
791
1,087

102
853
27
77
4,412
590
2,548
219

27,543

23,858
TOTAL #
SAMPLES
32
3,635
57
1,140
293
114
2,646
3,230
214
1,969
4,055
2,020
44
3,859
8,046
6,862
5,453
456
3,321
555
976
19
4,587
23,330
4,739
2,674

399
3,585
35
533
16,803
2,626
10,661
414

119,382

103,719
#GW
SAMPLES
31
2,616
11
900
181
81
1,692
1,085
198
901
3,451
1,423
38
3,291
6,325
6,677
3,296
426
2,861
455
896
16
4,370
21 ,279
3,486
2,110

318
3,200
26
191
12,143
1,772
8,736
359

94,841

83,813
#SW
SAMPLES
1
1,019
46
240
112
33
954
2,145
16
1,068
604
597
6
568
1,721
185
2,157
30
460
100
80
3
217
2,051
1,253
564

81
385
9
342
4,660
854
1,925
55

24,541

19,906
% TOTAL
SAMPLES
>MRL
9.38%
25.58%
100.00%
41 .67%
16.72%
28.07%
43.65%
29.63%
18.69%
65.72%
0.00%
17.67%
18.18%
7.75%
27.70%
1 1 .88%
43.10%
100.00%
18.91%
62.70%
9.32%
15.79%
2.90%
21.94%
31.76%
16.75%

0.75%
5.38%
40.00%
55.35%
0.08%
1 7.90%
21.10%
15.94%

19.34%

19.71%
%GW
SAMPLES
>MRL
6.45%
1 1 .66%
100.00%
34.33%
6.63%
24.69%
32.62%
15.67%
14.65%
42.06%
0.00%
7.10%
7.89%
4.28%
10.18%
9.70%
9.92%
100.00%
10.87%
58.02%
3.24%
0.00%
2.33%
1 7.90%
21.60%
7.11%

0.31 %
4.75%
26.92%
8.90%
0.02%
2.77%
10.18%
4.18%

1 1 .21 %

1 1 .60%
%SW
SAMPLES
>MRL
0.00%
61 .33%
100.00%
69.17%
33.04%
36.36%
63.21 %
36.69%
68.75%
85.67%
0.00%
42.88%
83.33%
27.82%
92.10%
90.27%
93.79%
100.00%
68.91 %
84.00%
77.50%
100.00%
14.29%
63.87%
60.02%
52.84%

2.47%
10.65%
77.78%
81 .29%
0.21%
49.30%
70.65%
92.73%

50.75%

53.90%
Ml N VALUE
(M9/L)
< 0.50
< 0.00
< 0.60
< 0.00
< 0.20
< 0.20
< 0.00
< 0.00
< 0.03
< 0.10
< 0.24
< 0.00
< 0.10
< 0.00
< 0.00
< 0.00
< 0.00
< 0.00
< 0.00
< 0.00
< 0.00
< 0.14
< 0.10
< 0.08
< 0.00
< 0.00

< 0.00
< 0.00
< 0.50
< 0.00
< 0.50
< 0.00
< 0.00
< 0.00

< 0.00

< 0.00
99% VALUE
(M9/L)
47.40
26.00
15.50
14.50
37.00
23.70
14.00
11.00
18.00
28.00
< 0.24
12.00
10.80
5.50
21.70
5.80
35.30
32.40
12.10
45.20
7.60
4.80
2.10
15.30
30.60
9.70

< 1.00
3.96
18.40
13.00
< 0.50
5.00
1.10
8.20

18.10

18.80
MAX VALUE
(M9/L)
47.40
3739.00
15.50
28.90
53.00
35.70
30.00
44.40
22.00
5000.00
< 0.24
39.60
10.80
35.00
717.50
37.00
62.30
59.00
61.00
82.80
12.00
4.80
39.00
80.00
153.90
58.80

3.00
18.60
18.40
21.10
44.00
7200.00
7.70
10.00

7200.00

5000.00
MIN
DETECTS
(M9/L)
0.60
0.00
0.60
0.50
1.00
0.60
0.06
0.07
0.06
0.20

0.25
0.10
1.00
0.40
0.20
0.00
0.00
0.10
0.00
0.50
0.58
0.10
0.08
0.50
0.40

1.00
0.52
0.67
0.50
0.50
0.00
0.10
1.20

0.00

0.00
MEDIAN
DETECTS
(M9/L)
1.00
2.72
4.50
2.40
17.00
2.15
1.20
3.10
2.46
5.70

3.85
2.95
2.00
6.30
1.40
10.80
2.45
2.75
3.05
2.10
0.63
1.40
2.20
4.50
1.80

1.00
1.86
2.99
3.60
14.00
0.01
0.20
4.40

2.80

2.80
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                 Occurrence of Unregulated Contaminants in Public Water Systems
Table B.17.C  SDWIS/FED (Round 2) Data- Bromodichloromethane Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL #
SAMPLES
32
3,635
57
1,140
293
114
2,646
3,230
214
1,969
4,055
2,020
44
3,859
8,046
6,862
5,453
456
3,321
555
976
19
4,587
23,330
4,739
2,674

399
3,585
35
533
16,803
2,626
10,661
414

119,382

103,719
TOTAL
UNIQUE PWS
22
625
43
402
123
34
830
86
120
430
1,310
443
38
744
2,726
1,558
1,413
165
1,763
296
685
16
715
2,250
791
1,087

102
853
27
77
4,412
590
2,548
219

27,543

23,858
# GW PWS
21
481
9
315
107
21
618
44
110
208
1,241
355
34
676
2,631
1,528
1,297
162
1,574
258
651
14
687
2,054
541
936

90
789
19
30
3,825
505
2,393
198

24,422

21,152
# SW PWS
1
144
34
87
16
13
212
42
10
222
69
88
4
68
95
30
116
3
189
38
34
2
28
196
250
151

12
64
8
47
587
85
155
21

3,121

2,706
% PWS
>MRL
13.64%
35.20%
100.00%
57.46%
11.38%
55.88%
55.90%
74.42%
22.50%
74.42%
0.00%
25.73%
15.79%
17.88%
8.33%
19.00%
21.02%
100.00%
19.68%
51.01%
7.30%
12.50%
11.33%
48.13%
67.13%
20.06%

2.94%
11.25%
48.15%
62.34%
0.16%
15.59%
18.13%
11.42%

21.25%

21.97%
% GW PWS
>MRL
9.52%
18.92%
100.00%
50.79%
4.67%
52.38%
44.34%
59.09%
17.27%
57.69%
0.00%
13.24%
8.82%
11.39%
5.66%
17.41%
14.80%
100.00%
12.64%
46.90%
3.99%
0.00%
9.61%
43.57%
54.53%
10.68%

1.11%
9.63%
31.58%
33.33%
0.08%
8.12%
13.75%
3.03%

15.51%

16.14%
% SW PWS
>MRL
100.00%
89.58%
100.00%
81.61%
56.25%
61.54%
89.62%
90.48%
80.00%
90.09%
0.00%
76.14%
75.00%
82.35%
82.11%
100.00%
90.52%
100.00%
78.31%
78.95%
70.59%
100.00%
53.57%
95.92%
94.40%
78.15%

16.67%
31.25%
87.50%
80.85%
0.68%
60.00%
85.81%
90.48%
% PWS
> 1/2 HRL
4.55%
2.24%
0.00%
0.00%
1.63%
2.94%
0.00%
1.16%
0.00%
3.49%
0.00%
0.23%
0.00%
0.27%
0.40%
0.06%
1.06%
1.82%
0.11%
4.39%
0.00%
0.00%
0.28%
1.07%
4.68%
0.28%

0.00%
0.00%
0.00%
0.00%
0.02%
0.51%
0.00%
0.00%

66.16%
0.55%

67.52%
0.59%
% GW PWS
> 1/2 HRL
4.76%
0.42%
0.00%
0.00%
0.00%
4.76%
0.00%
0.00%
0.00%
0.96%
0.00%
0.00%
0.00%
0.30%
0.30%
0.07%
0.08%
1.85%
0.13%
1.94%
0.00%
0.00%
0.15%
0.58%
1.66%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.20%

0.21%
% SW PWS
> 1/2 HRL
0.00%
8.33%
0.00%
0.00%
12.50%
0.00%
0.00%
2.38%
0.00%
5.86%
0.00%
1.14%
0.00%
0.00%
3.16%
0.00%
12.07%
0.00%
0.00%
21.05%
0.00%
0.00%
3.57%
6.12%
11.20%
1.99%

0.00%
0.00%
0.00%
0.00%
0.17%
3.53%
0.00%
0.00%

3.27%

3.55%
% PWS
>HRL
0.00%
0.64%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.70%
0.00%
0.00%
0.00%
0.00%
0.07%
0.00%
0.07%
0.00%
0.06%
0.34%
0.00%
0.00%
0.00%
0.09%
0.51%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.51%
0.00%
0.00%

0.08%

0.08%
% GW PWS
>HRL
0.00%
0.21%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.48%
0.00%
0.00%
0.00%
0.00%
0.08%
0.00%
0.00%
0.00%
0.06%
0.39%
0.00%
0.00%
0.00%
0.10%
0.37%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.04%

0.05%
% SW PWS
>HRL
0.00%
2.08%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.90%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.86%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.80%
0.00%

0.00%
0.00%
0.00%
0.00%
0.00%
3.53%
0.00%
0.00%

0.35%

0.30%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)

"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Bromodichloromethane is 60 ug/L.  This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                 Occurrence of Unregulated Contaminants in Public Water Systems
Table B.18.a  SDWIS/FED (Round 2) Data- Bromoform Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL
UNIQUE PWS
22
625
10
406
123
30
831
86
120
429
1,310
419
38
744
2,737
1,558
1,413
68
1,777
296
677
16
718
2,250
791
1,088
114
894
27
77
4,412
573
2,584
197


27,460

18,461
# GW PWS
21
481
8
318
107
22
619
44
110
208
1,241
344
34
676
2,642
1,528
1,297
68
1,586
258
650
14
690
2,054
541
937
102
794
19
30
3,825
497
2,428
194


24,387

16,348
# SW PWS
1
144
2
88
16
8
212
42
10
221
69
75
4
68
95
30
116
0
191
38
27
2
28
196
250
151
12
100
8
47
587
76
156
3


3,073

2,113
% PWS
>MRL
9.09%
8.00%
100.00%
28.57%
6.50%
56.67%
33.69%
48.84%
9.17%
28.21%
0.00%
8.35%
5.26%
2.42%
2.63%
3.92%
10.62%
100.00%
5.63%
21.96%
1.62%
0.00%
16.02%
29.87%
35.52%
5.88%
0.00%
0.89%
7.41%
15.58%
0.14%
2.09%
8.05%
2.03%


9.55%

12.12%
% GW PWS
>MRL
9.52%
3.74%
100.00%
31.13%
3.74%
54.55%
38.61%
45.45%
10.00%
35.10%
0.00%
5.52%
2.94%
2.51%
2.20%
3.27%
8.56%
100.00%
5.49%
21.32%
1.54%
0.00%
15.65%
29.41%
35.86%
5.23%
0.00%
0.88%
10.53%
20.00%
0.05%
1.81%
8.11%
2.06%


8.79%

11.08%
% SW PWS
>MRL
0.00%
22.22%
100.00%
19.32%
25.00%
62.50%
19.34%
52.38%
0.00%
21.72%
0.00%
21.33%
25.00%
1.47%
14.74%
36.67%
33.62%
0.00%
6.81%
26.32%
3.70%
0.00%
25.00%
34.69%
34.80%
9.93%
0.00%
1.00%
0.00%
12.77%
0.68%
3.95%
7.05%
0.00%


15.59%

20.11%
% PWS
>HRL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.17%
0.00%
0.00%


0.00%

0.01%
% GW PWS
>HRL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%

0.00%
% SW PWS
>HRL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1.32%
0.00%
0.00%


0.03%

0.05%
99% VALUE
(M9/L)
26.20
24.00
4.90
22.40
41.00
29.00
17.00
2.80
2.34
20.40
< 0.10
2.00
1.90
< 0.00
5.60
1.20
8.00
42.60
3.90
58.90
1.90
< 1.31
13.00
7.90
9.70
3.20
< 1.00
< 0.50
2.15
2.30
< 0.50
0.70
0.40
1.30


6.00

6.45
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type);  SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for
laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Bromoform is 400 |jg/L. This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                          Occurrence of Unregulated Contaminants in Public Water Systems
Table B.18.b SDWIS/FED (Round 2) Data- Bromoform Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL
UNIQUE PWS
22
625
10
406
123
30
831
86
120
429
1,310
419
38
744
2,737
1,558
1,413
68
1,777
296
677
16
718
2,250
791
1,088
114
894
27
77
4,412
573
2,584
197


27,460

18,461
TOTAL #
SAMPLES
32
3,642
12
1,347
292
102
2,644
2,603
214
1,957
4,055
1,852
44
3,567
8,017
6,864
5,446
202
3,355
440
957
19
4,601
23,330
4,744
2,675
422
3,843
35
533
16,800
2,318
10,883
351


118,198

81 ,994
#GW
SAMPLES
31
2,619
9
1,074
180
76
1,693
987
198
899
3,451
1,382
38
3,162
6,334
6,678
3,292
202
2,887
368
894
16
4,388
21,279
3,491
2,110
337
3,307
26
191
12,141
1,698
8,879
347


94,664

67,940
#SW
SAMPLES
1
1,023
3
273
112
26
951
1,616
16
1,058
604
470
6
405
1,683
186
2,154

468
72
63
3
213
2,051
1,253
565
85
536
9
342
4,659
620
2,004
4


23,534

14,054
% TOTAL
SAMPLES
>MRL
6.25%
6.34%
100.00%
16.04%
14.04%
21 .57%
22.62%
8.18%
8.88%
15.53%
0.00%
4.00%
4.55%
0.76%
5.61%
2.03%
7.27%
100.00%
4.74%
23.86%
2.09%
0.00%
8.24%
1 1 .20%
14.59%
3.85%
0.00%
0.34%
5.71%
4.69%
0.06%
1 .64%
3.91%
1.14%


6.38%

8.01%
%GW
SAMPLES
>MRL
6.45%
1 .95%
100.00%
17.97%
6.67%
19.74%
29.77%
7.50%
9.60%
22.80%
0.00%
3.18%
2.63%
0.82%
4.44%
1 .74%
4.74%
100.00%
4.95%
24.73%
1 .79%
0.00%
8.27%
11.16%
14.27%
3.55%
0.00%
0.36%
7.69%
4.71%
0.02%
1 .94%
4.18%
1.15%


6.24%

7.63%
%SW
SAMPLES
>MRL
0.00%
17.60%
100.00%
8.42%
25.89%
26.92%
9.88%
8.60%
0.00%
9.36%
0.00%
6.38%
16.67%
0.25%
10.04%
12.37%
11.14%
0.00%
3.42%
19.44%
6.35%
0.00%
7.51%
1 1 .65%
15.48%
4.96%
0.00%
0.19%
0.00%
4.68%
0.17%
0.81%
2.74%
0.00%


6.94%

9.80%
MIN VALUE
(Mg/L)
< 0.50
< 0.00
< 0.53
< 0.00
< 0.20
< 0.20
< 0.00
< 0.00
< 0.04
< 0.10
< 0.10
< 0.00
< 0.20
< 0.00
< 0.00
< 0.00
< 0.00
0.50
< 0.00
< 0.00
< 0.00
< 0.04
< 0.20
< 0.09
< 0.00
< 0.00
< 0.00
< 0.00
< 0.50
< 0.00
< 0.50
< 0.00
< 0.00
< 0.00


< 0.00

< 0.00
99% VALUE
fog/L)
26.20
24.00
4.90
22.40
41.00
29.00
17.00
2.80
2.34
20.40
< 0.10
2.00
1.90
< 0.00
5.60
1.20
8.00
42.60
3.90
58.90
1.90
< 1.31
13.00
7.90
9.70
3.20
< 1.00
< 0.50
2.15
2.30
< 0.50
0.70
0.40
1.30


6.00

6.45
MAX VALUE
fog/L)
26.20
220.00
4.90
53.10
45.00
37.00
41.00
58.00
2.90
130.00
< 0.10
18.00
1.90
11.00
27.50
9.90
118.00
61.00
75.90
94.10
20.00
< 1.31
79.00
104.00
98.90
62.10
< 1.00
63.50
2.15
8.20
12.33
800.00
294.40
2.20


800.00

294.40
MIN
DETECTS
(Mg/L)
0.60
0.25
0.53
0.50
1.00
0.50
0.09
0.14
0.13
0.10

0.37
0.20
1.10
0.40
0.50
0.50
0.50
0.30
0.00
0.56

0.20
0.09
0.50
0.50

0.67
0.55
0.50
2.00
0.00
0.10
1.30


0.00

0.00
MEDIAN
DETECTS
(Mg/L)
13.40
3.60
0.78
2.65
3.00
1.75
1.30
1.00
0.90
2.00

0.95
1.05
2.50
1.50
1.20
1.20
1.89
0.90
1.28
1.80

2.40
1.43
1.50
1.70

6.66
1.35
1.00
5.65
0.90
0.20
1.70


1.40

1.40
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                 Occurrence of Unregulated Contaminants in Public Water Systems
Table B.18.C  SDWIS/FED (Round 2) Data- Bromoform Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL #
SAMPLES
32
3,642
12
1,347
292
102
2,644
2,603
214
1,957
4,055
1,852
44
3,567
8,017
6,864
5,446
202
3,355
440
957
19
4,601
23,330
4,744
2,675
422
3,843
35
533
16,800
2,318
10,883
351


118,198

81,994
TOTAL
UNIQUE PWS
22
625
10
406
123
30
831
86
120
429
1,310
419
38
744
2,737
1,558
1,413
68
1,777
296
677
16
718
2,250
791
1,088
114
894
27
77
4,412
573
2,584
197


27,460

18,461
# GW PWS
21
481
8
318
107
22
619
44
110
208
1,241
344
34
676
2,642
1,528
1,297
68
1,586
258
650
14
690
2,054
541
937
102
794
19
30
3,825
497
2,428
194


24,387

16,348
# SW PWS
1
144
2
88
16
8
212
42
10
221
69
75
4
68
95
30
116
0
191
38
27
2
28
196
250
151
12
100
8
47
587
76
156
3


3,073

2,113
% PWS
>MRL
9.09%
8.00%
100.00%
28.57%
6.50%
56.67%
33.69%
48.84%
9.17%
28.21%
0.00%
8.35%
5.26%
2.42%
2.63%
3.92%
10.62%
100.00%
5.63%
21.96%
1.62%
0.00%
16.02%
29.87%
35.52%
5.88%
0.00%
0.89%
7.41%
15.58%
0.14%
2.09%
8.05%
2.03%


9.55%

12.12%
% GW PWS
>MRL
9.52%
3.74%
100.00%
31.13%
3.74%
54.55%
38.61%
45.45%
10.00%
35.10%
0.00%
5.52%
2.94%
2.51%
2.20%
3.27%
8.56%
100.00%
5.49%
21.32%
1.54%
0.00%
15.65%
29.41%
35.86%
5.23%
0.00%
0.88%
10.53%
20.00%
0.05%
1.81%
8.11%
2.06%


8.79%

11.08%
% SW PWS
>MRL
0.00%
22.22%
100.00%
19.32%
25.00%
62.50%
19.34%
52.38%
0.00%
21.72%
0.00%
21.33%
25.00%
1.47%
14.74%
36.67%
33.62%
0.00%
6.81%
26.32%
3.70%
0.00%
25.00%
34.69%
34.80%
9.93%
0.00%
1.00%
0.00%
12.77%
0.68%
3.95%
7.05%
0.00%

% PWS
> 1/2 HRL
0.00%
0.32%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.17%
0.04%
0.00%


15.59%
0.01%

20.11%
0.02%
% GW PWS
> 1/2 HRL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%

0.00%
% SW PWS
> 1/2 HRL
0.00%
1.39%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1.32%
0.64%
0.00%


0.13%

0.14%
% PWS
>HRL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.17%
0.00%
0.00%


0.00%

0.01%
% GW PWS
>HRL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%


0.00%

0.00%
% SW PWS
>HRL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1.32%
0.00%
0.00%


0.03%

0.05%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)

"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Bromoform is 400 ug/L. This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                  Occurrence of Unregulated Contaminants in Public Water Systems
Table B.19.a SDWIS/FED (Round 2) Data- Bromomethane Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL
UNIQUE PWS
22
625
1
407
121
15
831
86
68
76
1,310
418
38
744
2,735
1,558
1,245
1
1,776
296
682
16
715
2,232
791
1,087

113
906
25
77
4,410
527
2,549
200

26,703

23,328
#GWPWS
21
481
1
319
106
12
619
44
61
30
1,241
344
34
676
2,644
1,528
1,130
1
1,586
258
651
14
691
2,050
541
936

101
805
17
30
3,823
466
2,430
197

23,888

20,872
#SWPWS
1
144
0
88
15
3
212
42
7
46
69
74
4
68
91
30
115
0
190
38
31
2
24
182
250
151

12
101
8
47
587
61
119
3

2,815

2,456
% PWS
>MRL
0.00%
0.48%
100.00%
2.70%
0.00%
0.00%
1.56%
1.16%
0.00%
7.89%
0.00%
0.00%
2.63%
0.54%
0.00%
0.00%
0.48%
100.00%
0.62%
4.05%
0.00%
0.00%
0.42%
2.15%
1.77%
0.18%

0.00%
0.00%
0.00%
1.30%
0.84%
0.38%
0.16%
0.00%

0.68%

0.75%
% GW PWS
>MRL
0.00%
0.42%
100.00%
3.13%
0.00%
0.00%
2.10%
2.27%
0.00%
13.33%
0.00%
0.00%
0.00%
0.59%
0.00%
0.00%
0.44%
100.00%
0.50%
4.26%
0.00%
0.00%
0.43%
2.20%
2.40%
0.11%

0.00%
0.00%
0.00%
0.00%
0.81%
0.21%
0.16%
0.00%

0.66%

0.74%
% SW PWS
>MRL
0.00%
0.69%
0.00%
1.14%
0.00%
0.00%
0.00%
0.00%
0.00%
4.35%
0.00%
0.00%
25.00%
0.00%
0.00%
0.00%
0.87%
0.00%
1.58%
2.63%
0.00%
0.00%
0.00%
1.65%
0.40%
0.66%

0.00%
0.00%
0.00%
2.13%
1.02%
1.64%
0.00%
0.00%

0.82%

0.86%
% PWS
>MCL
0.00%
0.00%
0.00%
0.49%
0.00%
0.00%
0.00%
0.00%
0.00%
1.32%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.14%
0.09%
0.25%
0.09%

0.00%
0.00%
0.00%
0.00%
0.09%
0.00%
0.00%
0.00%

0.05%

0.06%
% GW PWS
>MCL
0.00%
0.00%
0.00%
0.31%
0.00%
0.00%
0.00%
0.00%
0.00%
3.33%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.14%
0.10%
0.37%
0.00%

0.00%
0.00%
0.00%
0.00%
0.10%
0.00%
0.00%
0.00%

0.05%

0.05%
% SW PWS
>MCL
0.00%
0.00%
0.00%
1.14%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.66%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.07%

0.08%
99% VALUE
(M9/L)
< 1.00
< 0.00
0.60
1.40
< 1.00
< 1.00
< 0.00
< 0.00
< 2.00
1.61
< 0.50
< 0.50
0.10
< 0.00
< 0.00
< 2.00
< 9.00
4.70
< 0.00
0.90
< 0.00
< 4.51
< 1.00
< 0.50
< 0.00
< 0.00

< 10.00
< 0.50
< 0.50
< 0.00
< 2.00
< 0.00
< 0.00
< 1.00

< 9.00

< 9.00
PWS= Public Water Systems;  GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory
analyses)

"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL violation. An
MCL violation occurs when the MCL is exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Bromomethane is 10 |jg/L.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                          Occurrence of Unregulated Contaminants in Public Water Systems
Table B.19.b SDWIS/FED (Round 2) Data- Bromomethane Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL
UNIQUE PWS
22
625
1
407
121
15
831
86
68
76
1,310
418
38
744
2,735
1,558
1,245
1
1,776
296
682
16
715
2,232
791
1,087

113
906
25
77
4,410
527
2,549
200

26,703

23,328
TOTAL #
SAMPLES
32
3,547
1
1,351
245
95
2,641
2,247
141
442
4,055
1,821
44
3,542
6,964
6,864
2,121
3
3,338
393
937
19
4,836
17,789
4,746
2,673

423
3,978
33
533
16,711
1,603
9,548
360

104,076

90,731
#GW
SAMPLES
31
2,606
1
1,077
173
65
1,691
909
128
136
3,451
1,370
38
3,138
6,140
6,678
1,877
3
2,878
323
892
16
4,620
16,433
3,492
2,109

338
3,422
24
191
12,091
1,407
8,661
356

86,765

76,588
#SW
SAMPLES
1
941
0
274
72
30
950
1,338
13
306
604
451
6
404
824
186
244
0
460
70
45
3
216
1,356
1,254
564

85
556
9
342
4,620
196
887
4

17,311

14,143
% TOTAL
SAMPLES
>MRL
0.00%
0.08%
100.00%
1.11%
0.00%
0.00%
0.61 %
0.04%
0.00%
2.26%
0.00%
0.00%
2.27%
0.17%
0.00%
0.00%
0.28%
100.00%
0.39%
3.56%
0.00%
0.00%
0.19%
0.41 %
0.34%
0.07%

0.00%
0.00%
0.00%
0.19%
0.28%
0.12%
0.04%
0.00%

0.23%

0.26%
%GW
SAMPLES
>MRL
0.00%
0.08%
100.00%
1 .30%
0.00%
0.00%
0.95%
0.11%
0.00%
4.41 %
0.00%
0.00%
0.00%
0.19%
0.00%
0.00%
0.27%
100.00%
0.35%
4.02%
0.00%
0.00%
0.19%
0.41 %
0.43%
0.05%

0.00%
0.00%
0.00%
0.00%
0.30%
0.07%
0.05%
0.00%

0.24%

0.27%
%SW
SAMPLES
>MRL
0.00%
0.11%
0.00%
0.36%
0.00%
0.00%
0.00%
0.00%
0.00%
1 .31 %
0.00%
0.00%
16.67%
0.00%
0.00%
0.00%
0.41 %
0.00%
0.65%
1 .43%
0.00%
0.00%
0.00%
0.37%
0.08%
0.18%

0.00%
0.00%
0.00%
0.29%
0.24%
0.51 %
0.00%
0.00%

0.18%

0.21%
Ml N VALUE
(M9/L)
< 0.50
< 0.00
0.60
< 0.00
< 0.20
< 0.20
< 0.00
< 0.00
< 0.50
< 0.40
< 0.50
< 0.00
< 0.10
< 0.00
< 0.00
< 0.00
< 0.00
2.70
< 0.00
< 0.00
< 0.00
< 0.50
< 0.50
< 0.50
< 0.00
< 0.00

< 0.00
< 0.00
< 0.50
< 0.00
< 0.51
< 0.00
< 0.00
< 0.00

< 0.00

< 0.00
99% VALUE
(M9/L)
< 1.00
< 0.00
0.60
1.40
< 1.00
< 1.00
< 0.00
< 0.00
< 2.00
1.61
< 0.50
< 0.50
0.10
< 0.00
< 0.00
< 2.00
< 9.00
4.70
< 0.00
0.90
< 0.00
< 4.51
< 1.00
< 0.50
< 0.00
< 0.00

< 10.00
< 0.50
< 0.50
< 0.00
< 2.00
< 0.00
< 0.00
< 1.00

< 9.00

< 9.00
MAX VALUE
(M9/L)
< 1.00
1.50
0.60
38.10
< 2.00
< 1.00
9.20
0.57
< 2.00
17.00
< 0.50
< 0.50
0.10
4.20
< 0.00
< 4.00
2.60
4.70
2.60
1.84
< 0.00
< 4.51
20.90
31.20
14.60
16.00

< 10.00
< 0.50
< 0.50
7.80
19.90
5.50
0.20
< 1.00

38.10

38.10
MIN
DETECTS
(M9/L)

0.81
0.60
1.40


0.09
0.57

0.80


0.10
1.10


2.00
2.70
0.50
0.52


1.00
0.51
0.70
0.50




7.80
0.51
0.50
0.10


0.09

0.09
MEDIAN
DETECTS
(M9/L)

1.13
0.60
2.60


0.21
0.57

1.53


0.10
1.45


2.00
4.00
0.50
0.83


3.90
1.64
1.35
8.25




7.80
2.61
3.00
0.10


1.60

1.60
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                 Occurrence of Unregulated Contaminants in Public Water Systems
Table B.19.C  SDWIS/FED (Round 2) Data- Bromomethane Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL #
SAMPLES
32
3,547
1
1,351
245
95
2,641
2,247
141
442
4,055
1,821
44
3,542
6,964
6,864
2,121
3
3,338
393
937
19
4,836
17,789
4,746
2,673

423
3,978
33
533
16,711
1,603
9,548
360

104,076

90,731
TOTAL
UNIQUE PWS
22
625
1
407
121
15
831
86
68
76
1,310
418
38
744
2,735
1,558
1,245
1
1,776
296
682
16
715
2,232
791
1,087

113
906
25
77
4,410
527
2,549
200

26,703

23,328
# GW PWS
21
481
1
319
106
12
619
44
61
30
1,241
344
34
676
2,644
1,528
1,130
1
1,586
258
651
14
691
2,050
541
936

101
805
17
30
3,823
466
2,430
197

23,888

20,872
# SW PWS
1
144
0
88
15
3
212
42
7
46
69
74
4
68
91
30
115
0
190
38
31
2
24
182
250
151

12
101
8
47
587
61
119
3

2,815

2,456
% PWS
>MRL
0.00%
0.48%
100.00%
2.70%
0.00%
0.00%
1.56%
1.16%
0.00%
7.89%
0.00%
0.00%
2.63%
0.54%
0.00%
0.00%
0.48%
100.00%
0.62%
4.05%
0.00%
0.00%
0.42%
2.15%
1.77%
0.18%

0.00%
0.00%
0.00%
1.30%
0.84%
0.38%
0.16%
0.00%

0.68%

0.75%
% GW PWS
>MRL
0.00%
0.42%
100.00%
3.13%
0.00%
0.00%
2.10%
2.27%
0.00%
13.33%
0.00%
0.00%
0.00%
0.59%
0.00%
0.00%
0.44%
100.00%
0.50%
4.26%
0.00%
0.00%
0.43%
2.20%
2.40%
0.11%

0.00%
0.00%
0.00%
0.00%
0.81%
0.21%
0.16%
0.00%

0.66%

0.74%
% SW PWS
>MRL
0.00%
0.69%
0.00%
1.14%
0.00%
0.00%
0.00%
0.00%
0.00%
4.35%
0.00%
0.00%
25.00%
0.00%
0.00%
0.00%
0.87%
0.00%
1.58%
2.63%
0.00%
0.00%
0.00%
1.65%
0.40%
0.66%

0.00%
0.00%
0.00%
2.13%
1.02%
1.64%
0.00%
0.00%
% PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.98%
0.00%
0.00%
0.12%
0.00%
0.00%
1.32%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.28%
0.54%
0.25%
0.09%

0.00%
0.00%
0.00%
1.30%
0.27%
0.19%
0.00%
0.00%

0.82%
0.14%

0.86%
0.15%
% GW PWS
> 1/2 MCL
0.00%
0.00%
0.00%
0.94%
0.00%
0.00%
0.16%
0.00%
0.00%
3.33%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.29%
0.54%
0.37%
0.00%

0.00%
0.00%
0.00%
0.00%
0.24%
0.00%
0.00%
0.00%

0.12%

0.14%
% SW PWS
> 1/2 MCL
0.00%
0.00%
0.00%
1.14%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.55%
0.00%
0.66%

0.00%
0.00%
0.00%
2.13%
0.51%
1.64%
0.00%
0.00%

0.28%

0.24%
% PWS
>MCL
0.00%
0.00%
0.00%
0.49%
0.00%
0.00%
0.00%
0.00%
0.00%
1.32%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.14%
0.09%
0.25%
0.09%

0.00%
0.00%
0.00%
0.00%
0.09%
0.00%
0.00%
0.00%

0.05%

0.06%
% GW PWS
>MCL
0.00%
0.00%
0.00%
0.31%
0.00%
0.00%
0.00%
0.00%
0.00%
3.33%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.14%
0.10%
0.37%
0.00%

0.00%
0.00%
0.00%
0.00%
0.10%
0.00%
0.00%
0.00%

0.05%

0.05%
% SW PWS
>MCL
0.00%
0.00%
0.00%
1.14%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.66%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.07%

0.08%
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
"% > MCL" indicates the proportion of systems with any analytical results exceeding the concentration value of the MCL; it does not necessarily indicate an MCL violation. An MCL violation occurs when the MCL is
exceeded by the average results from four quarterly samples or confirmation samples as required by the primacy States.
The Maximum Contaminant Level (MCL) for Bromomethane is 10 ug/L
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                               Occurrence of Unregulated Contaminants in Public Water Systems
Table B.20.a SDWIS/FED (Round 2) Data- Chloroethane Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL
UNIQUE PWS
22
625

407
121
16
831
86
117
92
1,310
418
976
744
2,735
1,558
1,413
3
1,758
296
679
16
717
2,232
791
1,087

114
906
27
77
4,411
526
2,549
159

27,819

24,433
# GW PWS
21
481

319
106
12
619
44
107
43
1,241
344
920
676
2,644
1,528
1,297
3
1,570
258
650
14
693
2,050
541
936

102
805
19
30
3,824
467
2,430
158

24,952

21,925
# SW PWS
1
144

88
15
4
212
42
10
49
69
74
56
68
91
30
116
0
188
38
29
2
24
182
250
151

12
101
8
47
587
59
119
1

2,867

2,508
% PWS
>MRL
0.00%
0.48%

0.00%
0.00%
0.00%
0.24%
0.00%
0.00%
1.09%
0.00%
0.48%
0.20%
0.67%
0.00%
0.32%
0.00%
100.00%
0.68%
0.00%
0.00%
0.00%
0.98%
1.43%
0.76%
0.09%

0.00%
0.00%
0.00%
1.30%
0.14%
0.19%
0.00%
0.00%

0.32%

0.34%
% GW PWS
>MRL
0.00%
0.42%

0.00%
0.00%
0.00%
0.16%
0.00%
0.00%
2.33%
0.00%
0.29%
0.11%
0.59%
0.00%
0.33%
0.00%
100.00%
0.64%
0.00%
0.00%
0.00%
0.87%
1.37%
0.92%
0.11%

0.00%
0.00%
0.00%
0.00%
0.13%
0.21%
0.00%
0.00%

0.30%

0.32%
% SW PWS
>MRL
0.00%
0.69%

0.00%
0.00%
0.00%
0.47%
0.00%
0.00%
0.00%
0.00%
1.35%
1.79%
1.47%
0.00%
0.00%
0.00%
0.00%
1.06%
0.00%
0.00%
0.00%
4.17%
2.20%
0.40%
0.00%

0.00%
0.00%
0.00%
2.13%
0.17%
0.00%
0.00%
0.00%

0.52%

0.56%
% PWS
>HRL














% GW PWS
>HRL














% SW PWS
>HRL














There is no Health Reference Level (HRL),
Maximum Contaminant Level (MCL), or
Health Advisory Level (HAL) for Chloroethane.






















































99% VALUE
(M9/L)
< 1.00
< 0.00

< 0.21
< 1.00
< 1.00
< 0.00
< 0.00
< 2.00
< 6.00
< 0.50
< 0.50
< 0.50
< 0.00
< 0.00
< 1.00
< 2.50
7.00
< 0.00
< 0.50
< 0.00
< 2.64
< 2.50
< 0.50
< 0.00
< 0.00

< 5.00
< 0.50
< 0.50
< 0.00
< 2.00
< 0.00
< 0.00
< 2.00

< 2.50

< 2.50
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for
laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                          Occurrence of Unregulated Contaminants in Public Water Systems
Table B.20.b SDWIS/FED (Round 2) Data- Chloroethane Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL
UNIQUE PWS
22
625

407
121
16
831
86
117
92
1,310
418
976
744
2,735
1,558
1,413
3
1,758
296
679
16
717
2,232
791
1,087

114
906
27
77
4,411
526
2,549
159

27,819

24,433
TOTAL #
SAMPLES
32
3,546

1,352
244
81
2,640
2,237
210
504
4,055
1,822
4,870
3,563
6,967
6,864
3,773
4
3,299
387
933
19
4,844
17,788
4,744
2,672

422
3,979
35
532
16,698
1,594
9,556
289

110,555

97,244
#GW
SAMPLES
31
2,605

1,078
172
61
1,690
901
194
180
3,451
1,370
4,319
3,160
6,143
6,678
3,275
4
2,843
317
891
16
4,628
16,432
3,491
2,108

338
3,423
26
190
12,074
1,406
8,670
288

92,453

82,290
#SW
SAMPLES
1
941

274
72
20
950
1,336
16
324
604
452
551
403
824
186
498
0
456
70
42
3
216
1,356
1,253
564

84
556
9
342
4,624
188
886
1

18,102

14,954
% TOTAL
SAMPLES
>MRL
0.00%
0.08%

0.00%
0.00%
0.00%
0.08%
0.00%
0.00%
0.20%
0.00%
0.11%
0.04%
0.59%
0.00%
0.09%
0.00%
100.00%
0.42%
0.00%
0.00%
0.00%
0.25%
0.36%
0.13%
0.04%

0.00%
0.00%
0.00%
0.19%
0.06%
0.06%
0.00%
0.00%

0.14%

0.15%
%GW
SAMPLES
>MRL
0.00%
0.08%

0.00%
0.00%
0.00%
0.06%
0.00%
0.00%
0.56%
0.00%
0.07%
0.02%
0.63%
0.00%
0.09%
0.00%
100.00%
0.42%
0.00%
0.00%
0.00%
0.24%
0.25%
0.14%
0.05%

0.00%
0.00%
0.00%
0.00%
0.07%
0.07%
0.00%
0.00%

0.12%

0.13%
%SW
SAMPLES
>MRL
0.00%
0.11%

0.00%
0.00%
0.00%
0.11%
0.00%
0.00%
0.00%
0.00%
0.22%
0.18%
0.25%
0.00%
0.00%
0.00%
0.00%
0.44%
0.00%
0.00%
0.00%
0.46%
1 .70%
0.08%
0.00%

0.00%
0.00%
0.00%
0.29%
0.04%
0.00%
0.00%
0.00%

0.19%

0.23%
MIN VALUE
(M9/L)
< 0.50
< 0.00

< 0.00
< 0.20
< 0.20
< 0.00
< 0.00
< 0.50
< 0.40
< 0.50
< 0.00
< 0.20
< 0.00
< 0.00
< 0.00
< 0.00
0.60
< 0.00
< 0.00
< 0.00
< 0.20
< 0.50
< 0.50
< 0.00
< 0.00

< 0.00
< 0.00
< 0.50
< 0.00
< 2.00
< 0.00
< 0.00
< 0.00

< 0.00

< 0.00
99% VALUE
(M9/L)
< 1.00
< 0.00

< 0.21
< 1.00
< 1.00
< 0.00
< 0.00
< 2.00
< 6.00
< 0.50
< 0.50
< 0.50
< 0.00
< 0.00
< 1.00
< 2.50
7.00
< 0.00
< 0.50
< 0.00
< 2.64
< 2.50
< 0.50
< 0.00
< 0.00

< 5.00
< 0.50
< 0.50
< 0.00
< 2.00
< 0.00
< 0.00
< 2.00

< 2.50

< 2.50
MAX VALUE
(M9/L)
< 1.00
22.00

< 0.21
< 2.00
< 1.00
0.70
< 0.00
< 2.00
1.00
< 0.50
0.96
1.30
84.50
< 0.00
3.40
< 2.50
7.00
7.50
< 0.50
< 0.00
< 2.64
2.50
288.20
3.40
1.50

< 5.00
< 0.50
< 0.50
0.80
8.20
0.80
< 0.00
< 2.00

288.20

288.20
MIN
DETECTS
(M9/L)

0.00




0.17


1.00

0.50
0.20
1.00

0.90

0.60
0.50



0.50
0.53
0.60
1.50




0.80
2.30
0.80



0.00

0.00
MEDIAN
DETECTS
(M9/L)

0.49




0.44


1.00

0.73
0.75
1.80

1.15

2.30
0.50



0.68
1.50
0.85
1.50




0.80
5.70
0.80



1.30

1.30
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                               Occurrence of Unregulated Contaminants in Public Water Systems
Table B.20.C SDWIS/FED (Round 2) Data- Chloroethane Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL #
SAMPLES
32
3,546

1,352
244
81
2,640
2,237
210
504
4,055
1,822
4,870
3,563
6,967
6,864
3,773
4
3,299
387
933
19
4,844
17,788
4,744
2,672

422
3,979
35
532
16,698
1,594
9,556
289

110,555

97,244
TOTAL
UNIQUE PWS
22
625

407
121
16
831
86
117
92
1,310
418
976
744
2,735
1,558
1,413
3
1,758
296
679
16
717
2,232
791
1,087

114
906
27
77
4,411
526
2,549
159

27,819

24,433
# GW PWS
21
481

319
106
12
619
44
107
43
1,241
344
920
676
2,644
1,528
1,297
3
1,570
258
650
14
693
2,050
541
936

102
805
19
30
3,824
467
2,430
158

24,952

21,925
# SW PWS
1
144

88
15
4
212
42
10
49
69
74
56
68
91
30
116
0
188
38
29
2
24
182
250
151

12
101
8
47
587
59
119
1

2,867

2,508
% PWS
>MRL
0.00%
0.48%

0.00%
0.00%
0.00%
0.24%
0.00%
0.00%
1.09%
0.00%
0.48%
0.20%
0.67%
0.00%
0.32%
0.00%
100.00%
0.68%
0.00%
0.00%
0.00%
0.98%
1.43%
0.76%
0.09%

0.00%
0.00%
0.00%
1.30%
0.14%
0.19%
0.00%
0.00%

0.32%

0.34%
% GW PWS
>MRL
0.00%
0.42%

0.00%
0.00%
0.00%
0.16%
0.00%
0.00%
2.33%
0.00%
0.29%
0.11%
0.59%
0.00%
0.33%
0.00%
100.00%
0.64%
0.00%
0.00%
0.00%
0.87%
1.37%
0.92%
0.11%

0.00%
0.00%
0.00%
0.00%
0.13%
0.21%
0.00%
0.00%

0.30%

0.32%
% SW PWS
>MRL
0.00%
0.69%

0.00%
0.00%
0.00%
0.47%
0.00%
0.00%
0.00%
0.00%
1.35%
1.79%
1.47%
0.00%
0.00%
0.00%
0.00%
1.06%
0.00%
0.00%
0.00%
4.17%
2.20%
0.40%
0.00%

0.00%
0.00%
0.00%
2.13%
0.17%
0.00%
0.00%
0.00%
% PWS
> 1/2 HRL
















% GW PWS
> 1/2 HRL
















% SW PWS
> 1/2 HRL
















% PWS
>HRL
















% GW PWS
>HRL
















% SW PWS
>HRL
















There is no Health Reference Level (HRL), Maximum Contaminant Level (MCL), or Health
Advisory Level (HAL) for Chloroethane.

















0.52%|

0.56%





































































































PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                 Occurrence of Unregulated Contaminants in Public Water Systems
Table B.21.a SDWIS/FED (Round 2) Data- Chloroform Occurrence in Public Water Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL
UNIQUE PWS
22
625
135
402
123
55
830
86
119
428
1,310
480
38
745
2,714
1,558
1,413
194
1,777
296
701
16
717
2,250
791
1,087

114
840
12
77
4,412
601
2,359
220

27,547

23,737
# GW PWS
21
481
78
315
107
33
618
44
109
207
1,241
384
34
677
2,619
1,528
1,297
191
1,586
258
659
14
689
2,054
541
936

102
778
11
30
3,825
513
2,211
198

24,389

21,021
# SW PWS
1
144
57
87
16
22
212
42
10
221
69
96
4
68
95
30
116
3
191
38
42
2
28
196
250
151

12
62
1
47
587
88
148
22

3,158

2,716
% PWS
>MRL
13.64%
50.40%
100.00%
53.98%
13.82%
80.00%
59.76%
75.58%
26.05%
80.37%
0.00%
45.21%
15.79%
20.94%
13.49%
33.89%
24.20%
100.00%
29.77%
51.01%
13.12%
25.00%
12.41%
58.76%
69.53%
25.48%

11.40%
13.57%
16.67%
85.71%
0.23%
17.30%
20.69%
13.64%

26.56%

27.42%
% GW PWS
>MRL
9.52%
37.01%
100.00%
47.62%
7.48%
75.76%
48.87%
59.09%
20.18%
67.15%
0.00%
35.42%
8.82%
14.18%
10.88%
32.59%
18.20%
100.00%
23.39%
46.90%
8.35%
14.29%
10.60%
55.16%
57.86%
14.96%

9.80%
11.83%
18.18%
76.67%
0.08%
9.36%
15.83%
5.05%

21.00%

21.84%
% SW PWS
>MRL
100.00%
95.14%
100.00%
77.01%
56.25%
86.36%
91.51%
92.86%
90.00%
92.76%
0.00%
84.38%
75.00%
88.24%
85.26%
100.00%
91.38%
100.00%
82.72%
78.95%
88.10%
100.00%
57.14%
96.43%
94.80%
90.73%

25.00%
35.48%
0.00%
91.49%
1.19%
63.64%
93.24%
90.91%

69.54%

70.54%
% PWS
>HRL
0.00%
0.32%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.23%
0.00%
0.00%
0.00%
0.00%
0.00%
0.06%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.46%

0.00%
0.00%
0.00%
0.00%
0.00%
0.33%
0.00%
0.00%

0.04%

0.04%
% GW PWS
>HRL
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.21%

0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%

0.01%

0.01%
% SW PWS
>HRL
0.00%
1.39%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.45%
0.00%
0.00%
0.00%
0.00%
0.00%
3.33%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
1.99%

0.00%
0.00%
0.00%
0.00%
0.00%
2.27%
0.00%
0.00%

0.28%

0.26%
99% VALUE
(M9/L)
21.50
184.00
58.50
150.00
63.00
130.00
47.00
58.00
51.00
250.00
< 0.09
64.00
24.30
74.00
103.80
26.00
301.00
187.90
65.60
109.00
38.00
6.30
2.70
55.40
87.30
48.00

5.00
21.90
2.23
52.00
< 0.50
62.00
7.70
61.00

102.00

110.00
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for
laboratory analyses)
The Health Reference Level (HRL) is the estimated health effect level as provided by EPA for preliminary assessment for this work assignment.
"% > HRL" indicates the proportion of systems with any analytical results exceeding the concentration value of the HRL.
The Health Reference Level (HRL) used for Chloroform is 600 ug/L.  This is a draft value for working review only.
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                           Occurrence of Unregulated Contaminants in Public Water Systems
Table B.21.b SDWIS/FED (Round 2) Data- Chloroform Occurrence in Public Water Systems- Based on Number of Samples
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL
UNIQUE PWS
22
625
135
402
123
55
830
86
119
428
1,310
480
38
745
2,714
1,558
1,413
194
1,777
296
701
16
717
2,250
791
1,087

114
840
12
77
4,412
601
2,359
220

27,547

23,737
TOTAL #
SAMPLES
32
3,645
210
1,154
293
154
2,641
3,345
213
1,964
4,055
2,211
44
4,033
7,971
6,861
5,445
506
3,354
565
1,009
19
4,565
23,329
4,743
2,670

423
3,481
16
533
16,811
2,747
9,918
418

119,378

103,356
#GW
SAMPLES
31
2,621
118
915
181
99
1,689
1,129
197
896
3,451
1,591
38
3,384
6,264
6,675
3,299
473
2,886
461
913
16
4,349
21 ,278
3,490
2,107

339
3,095
15
191
12,141
1,832
7,955
357

94,476

83,291
#SW
SAMPLES
1
1,024
92
239
112
55
952
2,216
16
1,068
604
620
6
649
1,707
186
2,146
33
468
104
96
3
216
2,051
1,253
563

84
386
1
342
4,670
915
1,963
61

24,902

20,065
% TOTAL
SAMPLES
>MRL
9.38%
38.08%
99.52%
40.90%
16.04%
47.40%
51 .31 %
32.20%
20.66%
71 .23%
0.00%
34.10%
18.18%
1 1 .41 %
31 .09%
20.43%
44.32%
100.00%
27.94%
63.89%
15.16%
26.32%
3.66%
26.13%
34.58%
22.47%

5.67%
6.72%
18.75%
65.67%
0.13%
19.77%
25.45%
18.18%

23.31 %

23.85%
%GW
SAMPLES
>MRL
6.45%
23.54%
100.00%
34.10%
5.52%
40.40%
36.94%
17.54%
16.24%
50.89%
0.00%
26.71%
7.89%
6.29%
14.32%
18.38%
12.00%
100.00%
20.62%
59.22%
7.45%
12.50%
2.99%
22.21%
24.01 %
10.35%

3.83%
6.14%
20.00%
26.70%
0.02%
3.44%
12.39%
5.32%

15.05%

15.63%
%SW
SAMPLES
>MRL
0.00%
75.29%
98.91 %
66.95%
33.04%
60.00%
76.79%
39.67%
75.00%
88.30%
0.00%
53.06%
83.33%
38.06%
92.62%
94.09%
93.99%
0.00%
73.08%
84.62%
88.54%
100.00%
17.13%
66.80%
64.01 %
67.85%

13.10%
1 1 .40%
0.00%
87.43%
0.41 %
52.46%
78.35%
93.44%

54.62%

57.98%
Ml N VALUE
(M9/L)
< 0.50
< 0.00
< 0.20
< 0.00
< 0.20
< 0.20
< 0.00
< 0.00
< 0.06
< 0.10
< 0.09
< 0.00
< 0.50
< 0.00
< 0.00
< 0.00
< 0.00
0.00
< 0.00
< 0.00
< 0.00
< 0.10
< 0.10
< 0.40
< 0.00
< 0.00

< 0.00
< 0.00
< 0.50
< 0.00
< 0.47
< 0.00
< 0.00
< 0.00

< 0.00

< 0.00
99% VALUE
(M9/L)
21.50
184.00
58.50
150.00
63.00
130.00
47.00
58.00
51.00
250.00
< 0.09
64.00
24.30
74.00
103.80
26.00
301 .00
187.90
65.60
109.00
38.00
6.30
2.70
55.40
87.30
48.00

5.00
21.90
2.23
52.00
< 0.50
62.00
7.70
61.00

102.00

110.00
MAX VALUE
(M9/L)
21.50
683.00
65.90
344.00
82.00
130.00
170.00
247.00
145.00
27000.00
< 0.09
280.00
24.30
377.00
441 .40
1200.00
526.00
451 .00
236.60
162.00
100.00
6.30
74.10
552.00
316.00
1800.00

23.00
180.00
2.23
72.00
160.00
14400.00
39.40
70.00

27000.00

27000.00
MIN
DETECTS
(M9/L)
0.60
0.00
0.20
0.50
0.40
0.40
0.02
0.10
0.09
0.10

0.00
0.60
0.50
0.40
0.10
0.20
0.00
0.30
0.00
0.50
0.27
0.10
0.40
0.50
0.50

0.70
0.50
0.76
0.50
0.47
0.00
0.10
1.00

0.00

0.00
MEDIAN
DETECTS
(M9/L)
11.20
5.10
1.00
2.80
25.00
1.50
1.58
10.30
2.10
16.00

2.05
7.30
8.65
15.70
1.10
54.20
3.80
5.70
3.06
5.10
0.60
1.30
1.95
9.60
6.35

2.00
7.13
1.01
11.00
17.50
0.10
1.70
13.00

4.10

3.90
PWS= Public Water Systems; GW= Ground Water (PWS Source Water Type); SW= Surface Water (PWS Source Water Type); MRL= Minimum Reporting Limit (for laboratory analyses)
The highlighted States are part of the SDWIS/FED 20 State Cross-Section.

-------
                                                 Occurrence of Unregulated Contaminants in Public Water Systems
Table B.21 .c  SDWIS/FED (Round 2) Data- Chloroform Occurrence in Public Water Systems- Based on Number of Systems
STATE
Tribes (06)
AK
AL
AR
AZ
CA
CO
CT
IN
KY
LA
MA
MD
ME
Ml
MN
MO
MS
NC
ND
NH
NJ
NM
OH
OK
OR
PA
Rl
SC
SD
TN
TX
VT
WA
Wl

TOTAL

20 STATES
TOTAL #
SAMPLES
32
3,645
210
1,154
293
154
2,641
3,345
213
1,964
4,055
2,211
44
4,033
7,971
6,861
5,445
506
3,354
565
1,009
19
4,565
23,329
4,743
2,670

423
3,481
16
533
16,811
2,747
9,918
418

119,378

103,356
TOTAL
UNIQUE PWS
22
625
135
402
123
55
830
86
11