Appendices to the Six-Year Review 3
Technical Support Document for
Nitrosamines
December 2016
EPA-810-R-16-009

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Appendix A
Non-UCMR 2 Occurrence in
Ambient Water and Drinking Water
Appendix A
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December 2016

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A.l Introduction
Occurrence data for the six nitrosamines considered in this document (A-nitrosodi-//-butyl amine
(NDBA), A-nitrosodi ethyl amine (NDEA), A-nitrosodi methyl amine (NDMA), A'-nitrosodi-//-
propylamine (NDPA), A^-nitrosom ethyl ethyl amine (NMEA) and A-nitrosopyrrolidine (NPYR)) are
available from a variety of sources in addition to the UCMR 2, as noted in Section 4.1. Those sources
include EPA's Storage and Retrieval (STORET) database, a review of highway and urban runoff
studies conducted by the U.S. Geological Survey (USGS), an EPA compilation of state data, the 2006
Community Water System Survey (CWSS), consumer confidence reports (CCRs) issued by public
water supplies and a dataset compiled by the Environmental Working Group (EWG). Exhibit A.l
summarizes the availability of data on the six nitrosamines from these occurrence sources.
Note that there may be some overlap, as sources with different purposes and audiences may have
reported the same underlying data.
Exhibit A.1: Availability of Occurrence Data from Sources Other Than the UCMR 2
Contaminant
Ambient
Water:
STORET
Ambient
Water:
Review of
Highway
and Urban
Runoff
Studies
Drinking
Water: EPA
Compilation of
State Data
Drinking
Water:
2006
CWSS
Drinking
Water:
CCRs
Drinking
Water:
EWG
Drinking
Water:
Primary
Literature
NDMA
X
X
X
X
X
X
X
NDEA
X

X




NMEA
X

X


X

NDPA
X
X
X


X

NDBA
X

X


X

NPYR
X

X


X

A.2 Occurrence in Ambient Water
Although not all ambient waters (e.g., lakes, rivers and aquifers) are sources of drinking water for
public water supplies, occurrence in ambient water provides an indication of the potential for
contaminants to occur in drinking water. The USGS National Water Quality Assessment (NAWQA)
Cycle 1 monitoring effort (1992-2001), an important source of national data on ambient water quality
data, has no information on the occurrence of the six nitrosamines discussed in this document.
Information is available, however, from two other sources: (1) EPA's STORET database and (2) the
USGS National Highway Runoff Data and Methodology Synthesis. Because the National Highway
Runoff Data and Methodology Synthesis has data on only two of the six contaminants, and uses a
reporting level orders of magnitude higher than the health reference levels (HRLs) of the contaminants,
it is of limited utility. EPA relied primarily on the STORET database to evaluate occurrence in ambient
water.
Appendix A
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A.2.1 EPA's Storage and Retrieval (STORET) Database
EPA's STORET Data Warehouse is an expanding, collaboratively assembled database that contains
raw biological, chemical and physical data from surface and ground water sampling conducted by
federal, state and local agencies; Indian Tribes; volunteer groups; academics; and others. A wide
variety of data relating to water quality from all 50 states as well as multiple territories and jurisdictions
of the United States are represented in this data system. These are primarily ambient water data, but in
some cases they are finished drinking water data. Users began populating the STORET Data
Warehouse in 1999. Most data are post-1999, but some earlier sampling is included.
Many (though not all) sample results are accompanied by information on sample location (latitude,
longitude, state, county, hydrologic unit code and a brief site identification), sample date, the medium
sampled (e.g., water, sediment or fish tissue) and the name of the organization that sponsored the
monitoring. In addition, there may be information on why the data were gathered; sampling and
analytical methods used; the laboratory used to analyze the samples; the quality control checks used
when sampling, handling the samples and analyzing the data; and the personnel responsible for the
data.
STORET data have quality limitations. The extent of national coverage and data completeness varies
from parameter to parameter. There are no restrictions on submission of data based on analytical
methods, quality assurance (QA) practices, etc. For more general STORET data information, please
refer to the program website (USEPA, 2012).
The results of EPA's analysis of STORET data for NDMA, NDEA, NMEA, NDPA, NDBA, and
NPYR are presented in Exhibits A.2 through A. 11. The data for NMEA and NDEA represent records
for these contaminants from 1996. The data for NDBA represent records from 1993 through 1996. The
data for NPYR represent records from 1996 through 2007. The data for NDMA represent records from
1980 through 2007. The data for NDPA represent records from 1980 through 2008. For NDMA and
NDPA, fewer records are available in the early years. Ground water data are from wells and surface
water data are from lakes, rivers/streams and reservoirs. STORET data categorized as "Public Water
Supply" data in the exhibits below were included for comparison with the ambient data; PWS data
were only reported from three states (Indiana, Missouri and Ohio). The PWS data are not included in
the "Total" row in the exhibits.
Exhibits A.2 through A. 5 show that none of the samples monitored for NDEA, NMEA, NDBA, and
NPYR contained detectable concentrations of these compounds.
Exhibits A.6 through A. 11 show STORET results for NDMA and NDPA. NDMA was detected at 164
out of 473 sites (34.67 percent) where samples were analyzed for the compound. The highest reported
concentration was 50 ng/L. NDPA was detected at 286 out of 746 sites (38.34 percent) where samples
were analyzed for the compound. The highest reported concentration was 20,000 ng/L. In addition to
summarizing the number of sites and states with detections of NDMA and NDPA, Exhibit A.7 and
Exhibit A.8 for NDMA, and Exhibit A. 10 and Exhibit A. 11 for NDPA, also summarize the number and
percentage of sites/states with detections greater than the HRLs and '/2 the HRLs for these
contaminants.
Appendix A
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Exhibit A.2: NDEA STORET Data - Summary Statistics
Source
Water Type
Total #
Samples
# Samples
with
Detections
Total #
Sites
# Sites
with
Detections
Total #
States
# States
with
Detections
Ground Water
0
0
0
0
0
0
Surface
Water
3
0
3
0
1
0
Total
3
0
3
0
1
0
Public Water
Supply
0
0
0
0
0
0
Note: For public water supply data, the type of source water (surface or ground) could not be determined based on
the information available in STORET.
Exhibit A.3: NMEA STORET Data - Summary Statistics
Source
Water Type
Total #
Samples
# Samples
with
Detections
Total #
Sites
# Sites
with
Detections
Total #
States
# States
with
Detections
Ground Water
0
0
0
0
0
0
Surface
Water
3
0
3
0
1
0
Total
3
0
3
0
1
0
Public Water
Supply
0
0
0
0
0
0
Note: For public water supply data, the type of source water (surface or ground) could not be determined based on
the information available in STORET.
Exhibit A.4: NDBA STORET Data - Summary Statistics
Source
Water Type
Total #
Samples
# Samples
with
Detections
Total #
Sites
# Sites
with
Detections
Total #
States
# States
with
Detections
Ground Water
133
0
114
0
1
0
Surface
Water
3
0
3
0
1
0
Total
136
0
117
0
2
0
Public Water
Supply
0
0
0
0
0
0
Note: For public water supply data, the type of source water (surface or ground) could not be determined based on
the information available in STORET.
Appendix A
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Exhibit A.5: NPYR STORET Data - Summary Statistics
Source
Water Type
Total #
Samples
# Samples
with
Detections
Total #
Sites
# Sites
with
Detections
Total #
States
# States
with
Detections
Ground Water
0
0
0
0
0
0
Surface
Water
7
0
6
0
3
0
Total
7
0
6
0
3
0
Public Water
Supply
0
0
0
0
0
0
Note: For public water supply data, the type of source water (surface or ground) could not be determined based on the
information available in STORET.
Exhibit A.6: NDMA STORET Data - Summary Statistics - Samples
Source
Water
Type
Total #
Samples
# Samples
with
Detections
%
Samples
with
Detections
Minimum
Value
(ng/L)
Median
Value
(ng/L)
90th
Percentile
Value (ng/L)
Maximum
Value (ng/L)
Ground
Water
410
133
32.44%
01
01
01
01
Surface
Water
502
68
13.55%
o1
o1
14
50
Total
912
201
22.04%
o1
o1
01
50
Public
Water
Supply
0
0
0.00%
N/A
N/A
N/A
N/A
Note: For public water supply data, the type of source water (surface or ground) could not be determined based on the
information available in STORET.
1A value of zero may represent a detection that was entered into the database as a non-numerical value (e.g., "Present").
Exhibit A.7: NDMA STORET Data - Summary of Sites
Source Water
Type
Total #
Sites
Sites with
Detections
(Count)
Sites with
Detections
(Percent)
Sites with
Detections
> V2 HRL
(0.3 ng/L)
(Count)
Sites with
Detections
> V2 HRL
(0.3 ng/L)
(Percent)
Sites with
Detections
> HRL (0.6
ng/L)
(Count)
Sites with
Detections
> HRL (0.6
ng/L
(Percent)
Ground Water
303
122
40.26%
0
0.00%
0
0.00%
Surface Water
170
42
24.71%
4
2.35%
4
2.35%
Total
473
164
34.67%
4
0.85%
4
0.85%
Public Water
Supply
0
0
0.00%
0
0.00%
0
0.00%
Note: For public water supply data, the type of source water (surface or ground) could not be determined based on the
information available in STORET.
Appendix A
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Exhibit A.8: NDMA STORET Data - Summary of States
Source
Water Type
Total
#
Sites
Sites with
Detections
(Count)
Sites with
Detections
(Percent)
Sites with
Detections
> V2 HRL
(0.3 ng/L)
(Count)
Sites with
Detections
> V2 HRL
(0.3 ng/L)
(Percent)
Sites with
Detections
> HRL (0.6
ng/L)
(Count)
Sites with
Detections
> HRL (0.6
ng/L
(Percent)
Ground Water
4
1
25.00%
0
0.00%
0
0.00%
Surface
Water
13
2
15.38%
1
7.69%
1
7.69%
Total
14
3
21.43%
1
7.14%
1
7.14%
Public Water
Supply
0
0
0.00%
0
0.00%
0
0.00%
Note: For public water supply data, the type of source water (surface or ground) could not be determined based on the
information available in STORET.
Exhibit A.9: NDPA STORET Data - Summary Statistics - Samples
Source
Water
Type
Total #
Samples
# Samples
with
Detections
%
Samples
with
Detections
Minimum
Value
(ng/L)
Median
Value
(ng/L)
90th
Percentile
Value
(ng/L)
Maximum
Value (ng/L)
Ground
Water
1,070
349
32.62%
01
01
01
20,000
Surface
Water
602
71
11.79%
o1
o1
190
10,340
Total
1,672
420
25.12%
o1
o1
01
20,000
Public







Water
Supply
(OH)
366
0
0.00%
N/A
N/A
N/A
N/A







Note: For public water supply data, the type of source water (surface or ground) could not be determined based on the
information available in STORET.
1A value of zero may represent a detection that was entered into the database as a non-numerical value (e.g., "Present").
Appendix A
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December 2016

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Exhibit A.10: NDPA STORET Data - Summary of Sites
Source Water
Type
Total #
Sites
Sites with
Detections
(Count)
Sites with
Detections
(Percent)
Sites with
Detections
> V2 HRL
(3.5 ng/L)
(Count)
Sites with
Detections >
V2 HRL (3.5
ng/L)
(Percent)
Sites with
Detections
> HRL (7
ng/L
(Count)
Sites with
Detections
> HRL (7
ng/L)
(Percent)
Ground Water
524
239
45.61%
13
2.48%
13
2.48%
Surface Water
222
47
21.17%
9
4.05%
9
4.05%
Total
746
286
38.34%
22
2.95%
22
2.95%
Public Water
Supply (OH)
176
0
0.00%
0
0.00%
0
0.00%
Note: For public water supply data, the type of source water (surface or ground) could not be determined based on the
information available in STORET.
Exhibit A.11: NDPA STORET Data - Summary of States
Source
Water Type
Total #
Sites
Sites with
Detections
(Count)
Sites with
Detections
(Percent)
Sites with
Detections
> V2 HRL
(3.5 ng/L)
(Count)
Sites with
Detections
> 1/2 HRL
(3.5 ng/L)
(Percent)
Sites with
Detections
> HRL (7
ng/L
(Count)
Sites with
Detections
> HRL (7
ng/L)
(Percent)
Ground Water
7
1
14.29%
1
14.29%
1
14.29%
Surface
Water
17
2
11.76%
1
5.88%
1
5.88%
Total
20
3
15.00%
2
10.00%
2
10.00%
Public Water
Supply (OH)
1
0
0.00%
0
0.00%
0
0.00%
Note: For public water supply data, the type of source water (surface or ground) could not be determined based on the
information available in STORET.
A.2.2 Review of Highway and Urban Runoff Studies
For the National Highway Runoff Data and Methodology Synthesis, USGS conducted a review of 44
highway and urban runoff studies implemented since 1970 (Lopes and Dionne, 1998). NDMA and
NDPA were analytes in three storm water studies: in Maricopa County, Arizona; in Colorado Springs,
Colorado; and in Dallas/Fort Worth, Texas. With a reporting level of 5,000 ng/L, neither of the
nitrosamines were detected in any of the studies.
A.3 Occurrence in Drinking Water, from Data Sources Other than the UCMR 2
Beyond UCMR 2, other sources of drinking water occurrence information and/or data for the six
nitrosamines under consideration include state monitoring programs, the 2006 CWSS, CCRs and the
EWG National Drinking Water Database. Descriptions of these sources, and analysis of occurrence
data from these sources, are provided below.
Appendix A
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December 2016

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A.3.1 EPA Compilation of State Data
Because there is no national database that receives and stores all relevant data regarding the occurrence
of regulated contaminants in public drinking water systems, EPA conducted a voluntary data call-in
from the states, territories and tribes to obtain regulated contaminant occurrence data in support of
national occurrence assessments conducted for the second Six-Year Review. For more details on the
SYR ICR Dataset, refer to USEPA (2009a).
A few states also submitted PWS occurrence data for unregulated contaminants. EPA was able to
supplement these data on unregulated contaminants by downloading additional publicly available
monitoring data from state websites. The result was a collection of unregulated contaminant monitoring
data from nine states, representing those states with varying degrees of completeness. The nine state
data sets vary in the number of contaminants monitored and the number of samples taken.
Two of the state data sets include data on nitrosamines. Unregulated contaminant monitoring data from
California cover all six of the nitrosamines under consideration in this document. Additional, very
limited data on one of the nitrosamines (one sample tested for NDPA) are available from Illinois.
Precise information about methods used and reporting levels is not available for the state data.
Minimum detected concentration values, presented in the tables, may be indicative of reporting levels
used for particular contaminants.
NDMA drinking water occurrence data were submitted from California (Exhibits A. 13 through A. 15).
The data indicate that NDMA was detected in 1,531 drinking water samples. These detections occurred
in 24 (23.8 percent) of 101 systems that reported data. Detected concentrations ranged from 1 ng/L to
440,000 ng/L, with all reported concentrations greater than the HRL of 0.6 ng/L.
NDEA drinking water occurrence data were submitted from California (Exhibits A. 16 through A. 18).
The data indicate that NDEA was detected in one drinking water sample. The detected concentration
was 30 ng/L, which is greater than the HRL of 0.4 ng/L.
NMEA drinking water occurrence data were submitted from California. There were no reported
detections of NMEA in 57 samples from four systems.
NDPA drinking water occurrence data were submitted from California and Illinois. There were no
reported detections of NDPA in 439 samples from 55 systems in California. A single sample from a
single system in Illinois was found not to contain NDPA.
NDBA drinking water occurrence data were submitted from California. There were no reported
detections of NDBA in 57 samples from four systems.
NPYR drinking water occurrence data were submitted from California. There were no reported
detections of NPYR in 57 samples from four systems.
Appendix A
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Technical Support Document for Nitrosamines Page 8 of 13
December 2016

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Exhibit A.12: NDMA State Drinking Water Occurrence Data - Summary of
Concentrations Detected
State
Source
Water
Type
Total #
of
Systems
Sample
with
Detections
(Count)
Sample
with
Detections
(Percent)
Minimum
Value
(ng/L)
Median
Value
(ng/L)
90th
Percentile
Value
(ng/L)
99th
Percentile
Value
(ng/L)
Maximum
Value
(ng/L)
CA
Ground
Water
2,581
998
38.7%
1
10
170
400
440,000
CA
Surface
Water
1,951
533
27.3%
1
9
170
795
12,000
CA
Total
4,532
1,531
33.8%
1
9
170
651
440,000
Exhibit A.13: NDMA State Drinking Water Occurrence Data - Summary of System Data
State
Source
Water
Type
Total #
of
Systems
Systems
with
Detections
(Count)
Systems
with
Detections
(Percent)
Systems
with
Detections
> V2 HRL
(0.3 ng/L)
(Count)
Systems
with
Detections
> V2 HRL
(0.3 ng/L)
(Percent)
Systems
with
Detections
> HRL (0.6
ng/L)
(Count)
Systems
with
Detections
> HRL (0.6
ng/L)
(Percent)
CA
Ground
Water
66
10
15.2%
10
15.2%
10
15.2%
CA
Surface
Water
35
14
40.0%
14
40.0%
14
40.0%
CA
Total
101
24
23.8%
24
23.8%
24
23.8%
Exhibit A.14: NDMA State Drinking Water Occurrence Data - Summary of Sample Data
State
Source
Water
Type
Total #
of
Systems
Systems
with
Detections
(Count)
Systems
with
Detections
(Percent)
Systems
with
Detections
> V2 HRL
(0.3 ng/L)
(Count)
Systems
with
Detections
> 1/2 HRL
(0.3 ng/L)
(Percent)
Systems
with
Detections
> HRL (0.6
ng/L)
(Count)
Systems
with
Detections
> HRL (0.6
ng/L)
(Percent)
CA
Ground
Water
2,581
998
38.7%
998
38.7%
998
38.7%
CA
Surface
Water
1,951
533
27.3%
533
27.3%
533
27.3%
CA
Total
4,532
1,531
33.8%
1,531
33.8%
1,531
33.8%
Appendix A
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Technical Support Document for Nitrosamines Page 9 of 13
December 2016

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Exhibit A.15: NDEA State Drinking Water Occurrence Data - Summary of
Concentrations Detected
State
Source
Water
Type
Total #
of
Systems
Sample
with
Detections
(Count)
Sample
with
Detections
(Percent)
Minimum
Value
(ng/L)
Median
Value
(ng/L)
90th
Percentile
Value
(ng/L)
99th
Percentile
Value
(ng/L)
Maximum
Value
(ng/L)
CA
Ground
Water
14
0
0.0%
N/A
N/A
N/A
N/A
N/A
CA
Surface
Water
92
1
1.1%
30
30
30
30
30
CA
Total
106
1
0.9%
30
30
30
30
30
Exhibit A.16: NDEA State Drinking Water Occurrence Data - Summary of System Data
State
Source
Water
Type
Total # of
Systems
Systems
with
Detections
(Count)
Systems
with
Detections
(Percent)
Systems
with
Detections
> V2 HRL
(0.2 ng/L)
(Count)
Systems
with
Detections
> V2 HRL
(0.2 ng/L)
(Percent)
Systems
with
Detections
> HRL (0.4
ng/L)
(Count)
Systems
with
Detections
> HRL (0.4
ng/L)
(Percent)
CA
Ground
Water
7
0
0.0%
0
0.0%
0
0.0%
CA
Surface
Water
7
1
14.3%
1
14.3%
1
14.3%
CA
Total
14
1
7.1%
1
7.1%
1
7.1%
Exhibit A.17: NDEA State Drinking Water Occurrence Data - Summary of Sample Data
State
Source
Water
Type
Total # of
Systems
Systems
with
Detections
(Count)
Systems
with
Detections
(Percent)
Systems
with
Detections
> V2 HRL
(0.2 ng/L)
(Count)
Systems
with
Detections
> 1/2 HRL
(0.2 ng/L)
(Percent)
Systems
with
Detections
> HRL (0.4
ng/L)
(Count)
Systems
with
Detections
> HRL (0.4
ng/L)
(Percent)
CA
Ground
Water
14
0
0.0%
0
0.0%
0
0.0%
CA
Surface
Water
92
1
1.1%
1
1.1%
1
1.1%
CA
Total
106
1
0.9%
1
0.9%
1
0.9%
Appendix A
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Technical Support Document for Nitrosamines Page 10 of 13
December 2016

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A.3.2 2006 Community Water System Survey (CWSS)
The 2006 CWSS (USEPA, 2009b) gathered data on the financial and operating characteristics of all
community water systems (CWSs) serving more than 500,000 people (94 systems in 2006) and a
random sample of all CWSs serving fewer than 500,000 people. Systems serving more than 500,000
people were also asked questions about concentrations of unregulated contaminants in their raw and
finished water. Of the 94 systems asked about unregulated contaminants, 62 percent (58 systems)
responded to the survey. Not all systems that responded to the survey answered every question. EPA
supplemented the data set by gathering additional information about contaminant occurrence at the 94
systems from publicly available sources (e.g., consumer confidence reports).
The 2006 CWSS includes information on monitoring of one of the six nitrosamines, NDMA.
In the 2006 CWSS, of the 94 systems serving more than 500,000 people, seven reported monitoring
data for NDMA. In nine samples collected at the seven systems, NDMA was detected in two samples
(at two different systems). Both detections were reported as 1.4 ng/L, which is greater than the HRL of
0.6 ng/L.
A.3.3 Water Systems' Consumer Confidence Reports (CCRs)
CCRs are annual water quality reports that CWSs are required to provide to their customers. These
reports summarize information on water sources, detected contaminants and system compliance with
EPA drinking water standards; they may also include general educational material. Under the CCR
Rule (40 CFR Subpart O), CWSs must prepare and distribute a CCR to all billing units or service
connections every year. Systems serving 100,000 or more residents are also required to post their
current CCRs on a publicly accessible Internet site. EPA reviewed CCRs published by the 26 systems
that serve over 1 million customers for unregulated contaminant occurrence information.
Consulted CCRs include information on monitoring of one of the six nitrosamines, NDMA.
Data on NDMA were available from CCRs prepared by one CWS in Massachusetts: the Massachusetts
Water Resources Authority (MWRA). MWRA reported average annual NDMA concentrations of 0.8
ng/L and 1.4 ng/L for 2006 and 2007, respectively; both average annual NDMA concentrations
exceeded the HRL of 0.6 ng/L.
A.3.4 Environmental Working Group (EWG) Drinking Water Database, 2004-2009
In December 2009, EWG released its "National Drinking Water Database," which includes data on the
occurrence of drinking water contaminants (regulated and unregulated) collected between 2004 and
2009 from 45 states and the District of Columbia (EWG, 2009). The 2009 EWG database includes
results from approximately 48,000 water systems; data were obtained primarily from state water
offices.
EWG reviewed the data for inconsistencies, potential outliers and other errors. They invited the
American Water Works Association (AWW A) and Association of Metropolitan Water Agencies
(AMWA) to review their data and/or have their constituents, the PWSs, review the data as well. Some
corrections apparently were made since the public release of the data in December 2009. The data
Appendix A
Six-Year Review 3
Technical Support Document for Nitrosamines Page 11 of 13
December 2016

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analyzed in this report were downloaded on December 29, 2010. EPA's analysis is based solely on the
data made publicly available by EWG on its website. Reporting levels are not specified in EWG's
database.
The EWG database includes information on monitoring of five of the six nitrosamines: NDMA,
NMEA, NDPA, NDBA, and NPYR (all except NDEA).
A total of 78 systems reported testing for NDMA. Of these, 26 systems in three states had detections of
NDMA. Of those 26 systems, the ten identified by EWG as having the highest average concentrations
of NDMA all had at least one detected concentration in excess of the HRL of 0.6 ng/L. The highest
NDMA concentration reported on the EWG website was 260 ng/L.
A total of 14 systems reported testing for NMEA. There were no detections.
A total of 48 systems reported testing for NDPA; one system in California reported a detection in 1 of
12 samples. Based on the information provided by EWG, it appears that the detected value was 0.667
ng/L. That value does not exceed the HRL of 7 ng/L.
A total of 18 systems reported testing for NDBA; two systems reported detections. Both of those
systems were in California. The maximum concentrations of NDBA reported at the two systems were
2,200 ng/L and 2 ng/L. The higher concentration, which was detected at a system serving a population
of 156,500, exceeds the HRL of 30 ng/L.
A total of 20 systems reported testing for NPYR; four systems in two states (California and Illinois)
each reported a single detection of NPYR. Three of the four detections were in excess of the HRL of 2
ng/L. The maximum detected concentration was 10 ng/L.
A.3.5 Primary Literature
Krasner et al. (2014) evaluated occurrence of NDMA and other select nitrosamines at 36 North
American drinking water plants. NDMA was detected more frequently than the other nitrosamines
(most of which are not identified in the report), and was particularly observed at plants that use
chloramines for disinfection. Exhibit A. 18 presents summary statistics for 14 U.S. chloraminating
plants. The statistics (minimum, 25th percentile, median, etc.) were calculated based on the average
results from each plant at each of three sampling locations.
Exhibit A.18: NDMA Concentrations across 14 U.S. Drinking Water Plants that Practice
Chloramination
Statistic
Finished Drinking Water
(ng/L)
Distribution System;
Average (ng/L)
Distribution System;
Maximum (ng/L)
Minimum
Not detected
<1.0
<1.0
25th Percentile
<1.0
<1.0
1.4
Median
1.0
2.2
2.9
75th Percentile
3.9
5.2
7.3
Maximum
11
17
18
Appendix A
Six-Year Review 3
Technical Support Document for Nitrosamines Page 12 of 13
December 2016

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References
Environmental Working Group (EWG). 2009. National Drinking Water Database. Available online at:
http://www.ewg.org/tap-water/home. Accessed January 10, 2010.
Krasner, S.W., S. Leavey, Y. Qian, R. Marfil-Vega, and Z. Bukhari. 2014. Survey of nitrosamine
occurrence in North America. WQTC 2014 Conference Proceedings.
Lopes, T.J. and S.G. Dionne. 1998. A Review of Semivolatile & VOCs in Highway Runoff and Urban
Stormwater. U.S. Geological Survey Open-File Report 98-409.
United States Environmental Protection Agency (USEPA). 2009a. The Analysis of Regulated
Contaminant Occurrence Data from Public Water Systems in Support of the Second Six-Year
Review of National Primary Drinking Water Regulations. EPA 815-B-09-006. October 2009.
USEPA. 2009b. Community Water System Survey 2006, Draft 3.5. EPA 815-R-09-001. February
2009.
USEPA. 2012. Storage and Retrieval (STORET) Data Warehouse. Available online at:
http://www.epa.gov/storet/index.html. Accessed March 2012.
Appendix A
Six-Year Review 3
Technical Support Document for Nitrosamines Page 13 of 13
December 2016

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Appendix B
UCMR 2 Systems and Population Served Predicted
To Have Detections Exceeding Thresholds
Appendix B
Six-Year Review 3
Technical Support Document for Nitrosamines Page 1 of 30
December 2016

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The UCMR 2 data set for nitrosamines includes data for 1,198
systems, 4,666 entry point locations and 2,397 maximum residence
time locations. A model was developed to generate estimates of
NDMA occurrence. The purpose of the model was to estimate the
mean concentration of NDMA in the drinking water of each water
system in UCMR, heterogeneity across systems in their means,
variability around those means and uncertainty in those estimates. To
produce the results in this appendix, the statistical model was used to
simulate the probability of a detection exceeding the HRL and other
thresholds at each facility, given that facility's parameter values of
mean and variability. Appendix B provides system level counts, which
are broken down by source water type. Tables are first presented for
all disinfectants, and then for chlorine (CL Only), chloramines (CA
Only), chloramines with other types of disinfectants (CA with CL-OT),
chlorine with other types of disinfectants (CL with OT), other types of
disinfectants (OT Only) and no disinfectant (ND Only).
Appendix B
Six-Year Review 3
Technical Support Document for Nitrosamines Page 2 of 30
December 2016

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B.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
480
223
190
255
46.42%
1,208,921
638,917
538,756
734,210
52.85%
2
480
96
82
113
20.09%
1,208,921
315,714
263,980
375,698
26.12%
6
480
41
35
47
8.49%
1,208,921
159,356
136,502
187,729
13.18%
10
480
28
24
33
5.80%
1,208,921
113,937
93,967
137,385
9.42%
20
480
16
14
19
3.38%
1,208,921
65,820
52,682
81,921
5.44%
60
480
6
5
8
1.30%
1,208,921
24,673
18,147
31,839
2.04%
100
480
4
2
5
0.73%
1,208,921
13,862
8,966
19,291
1.15%
200
480
1
0
2
0.24%
1,208,921
4,814
1,450
8,973
0.40%
600
480
0
0
0
0.01%
1,208,921
242
13
843
0.02%
Surface Water
Systems
0.6
222
153
138
166
68.72%
573,691
410,165
368,802
448,687
71.50%
2
222
71
64
80
32.02%
573,691
214,996
191,572
242,768
37.48%
6
222
30
27
34
13.57%
573,691
112,716
101,022
125,302
19.65%
10
222
21
18
23
9.29%
573,691
83,537
71,403
95,782
14.56%
20
222
12
10
14
5.48%
573,691
51,027
41,815
61,673
8.89%
60
222
5
4
6
2.22%
573,691
20,522
14,709
26,699
3.58%
100
222
3
1
4
1.15%
573,691
10,794
6,880
15,647
1.88%
200
222
1
0
1
0.31%
573,691
3,257
1,006
6,170
0.57%
600
222
0
0
0
0.01%
573,691
124
8
407
0.02%
Ground Water
Systems
0.6
240
54
37
71
22.32%
548,364
146,086
95,907
199,093
26.64%
2
240
12
8
18
5.18%
548,364
34,509
17,455
55,825
6.29%
6
240
2
1
4
0.79%
548,364
5,213
1,327
12,122
0.95%
10
240
1
0
2
0.26%
548,364
1,669
229
5,169
0.30%
20
240
0
0
0
0.04%
548,364
246
10
1,010
0.04%
60
240
0
0
0
0.00%
548,364
4
0
18
0.00%
100
240
0
0
0
0.00%
548,364
0
0
2
0.00%
200
240
0
0
0
0.00%
548,364
0
0
0
0.00%
600
240
0
0
0
0.00%
548,364
0
0
0
0.00%
Mixed Water
Systems
0.6
18
17
15
18
92.62%
86,866
82,666
74,046
86,429
95.17%
2
18
13
11
15
71.78%
86,866
66,209
54,952
77,105
76.22%
6
18
9
8
10
48.30%
86,866
41,428
34,153
50,305
47.69%
10
18
7
6
8
36.78%
86,866
28,730
22,334
36,433
33.07%
20
18
4
3
5
21.99%
86,866
14,547
10,856
19,238
16.75%
60
18
1
1
2
7.11%
86,866
4,146
3,438
5,122
4.77%
100
18
1
1
1
5.26%
86,866
3,068
2,085
3,643
3.53%
200
18
0
0
1
2.66%
86,866
1,558
444
2,802
1.79%
600
18
0
0
0
0.20%
86,866
118
5
436
0.14%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 3 of 30
December 2016

-------
B.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
All Systems
0.6
320
175
147
202
54.67%
14,029,015
8,094,774
6,760,677
9,387,500
57.70%
2
320
81
68
98
25.39%
14,029,015
3,977,755
3,355,708
4,768,634
28.35%
6
320
34
29
40
10.66%
14,029,015
1,778,948
1,504,010
2,109,539
12.68%
10
320
22
18
26
6.82%
14,029,015
1,174,110
969,791
1,408,971
8.37%
20
320
10
8
14
3.25%
14,029,015
581,138
426,155
745,847
4.14%
60
320
2
1
3
0.58%
14,029,015
91,087
37,952
175,618
0.65%
100
320
1
0
1
0.19%
14,029,015
25,320
7,240
60,371
0.18%
200
320
0
0
0
0.03%
14,029,015
2,913
422
8,537
0.02%
600
320
0
0
0
0.00%
14,029,015
37
1
122
0.00%
Surface Water
Systems
0.6
120
84
75
92
70.21%
5,187,934
3,762,816
3,353,921
4,126,684
72.53%
2
120
44
39
51
36.97%
5,187,934
2,072,165
1,817,495
2,373,366
39.94%
6
120
20
18
22
16.52%
5,187,934
974,076
866,456
1,109,015
18.78%
10
120
13
12
15
11.11%
5,187,934
659,930
575,777
750,073
12.72%
20
120
7
5
8
5.72%
5,187,934
333,090
270,170
403,805
6.42%
60
120
2
1
2
1.26%
5,187,934
62,425
33,137
101,287
1.20%
100
120
1
0
1
0.44%
5,187,934
18,436
6,749
37,755
0.36%
200
120
0
0
0
0.07%
5,187,934
2,175
410
5,726
0.04%
600
120
0
0
0
0.00%
5,187,934
26
1
98
0.00%
Ground Water
Systems
0.6
163
62
48
77
38.13%
7,021,968
2,903,214
2,222,315
3,626,222
41.34%
2
163
20
15
27
12.30%
7,021,968
1,016,666
765,678
1,354,525
14.48%
6
163
5
4
7
3.34%
7,021,968
296,757
212,374
402,977
4.23%
10
163
3
2
4
1.74%
7,021,968
171,448
128,180
227,291
2.44%
20
163
1
1
2
0.74%
7,021,968
90,225
48,438
125,424
1.28%
60
163
0
0
1
0.12%
7,021,968
18,242
2,397
48,628
0.26%
100
163
0
0
0
0.04%
7,021,968
5,433
300
18,253
0.08%
200
163
0
0
0
0.00%
7,021,968
678
9
2,603
0.01%
600
163
0
0
0
0.00%
7,021,968
11
0
24
0.00%
Mixed Water
Systems
0.6
37
29
24
33
77.17%
1,819,112
1,428,744
1,184,441
1,634,593
78.54%
2
37
17
14
20
45.53%
1,819,112
888,924
772,535
1,040,743
48.87%
6
37
9
7
10
23.94%
1,819,112
508,115
425,180
597,546
27.93%
10
37
6
4
7
15.25%
1,819,112
342,732
265,834
431,607
18.84%
20
37
2
2
3
6.30%
1,819,112
157,824
107,547
216,618
8.68%
60
37
0
0
0
0.39%
1,819,112
10,421
2,419
25,703
0.57%
100
37
0
0
0
0.06%
1,819,112
1,451
190
4,363
0.08%
200
37
0
0
0
0.00%
1,819,112
60
3
207
0.00%
600
37
0
0
0
0.00%
1,819,112
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 4 of 30
December 2016

-------
B.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All Systems
0.6
398
296
268
324
74.46%
141,981,684
110,803,964
95,110,205
123,563,993
78.04%
2
398
182
164
203
45.67%
141,981,684
68,223,812
60,037,674
80,915,126
48.05%
6
398
89
80
99
22.38%
141,981,684
33,492,275
28,213,900
39,584,290
23.59%
10
398
54
47
61
13.51%
141,981,684
19,332,672
15,754,079
24,202,416
13.62%
20
398
21
17
26
5.37%
141,981,684
8,108,918
6,833,104
9,976,992
5.71%
60
398
4
3
5
0.95%
141,981,684
3,042,698
2,486,428
3,588,127
2.14%
100
398
2
1
2
0.39%
141,981,684
1,285,079
721,816
2,010,229
0.91%
200
398
0
0
1
0.08%
141,981,684
140,122
41,985
320,317
0.10%
600
398
0
0
0
0.00%
141,981,684
1,341
98
4,581
0.00%
Surface Water
Systems
0.6
218
162
150
175
74.47%
89,237,751
69,607,213
60,001,754
77,436,757
78.00%
2
218
101
94
110
46.47%
89,237,751
43,477,490
38,634,537
51,643,441
48.72%
6
218
53
49
57
24.26%
89,237,751
20,935,912
17,765,708
24,691,009
23.46%
10
218
33
30
37
15.33%
89,237,751
11,723,362
9,618,940
14,493,813
13.14%
20
218
15
13
17
6.85%
89,237,751
4,240,842
3,436,580
5,261,167
4.75%
60
218
3
2
4
1.20%
89,237,751
545,678
324,909
843,718
0.61%
100
218
1
1
2
0.51%
89,237,751
180,053
98,225
307,503
0.20%
200
218
0
0
1
0.13%
89,237,751
35,845
9,833
74,747
0.04%
600
218
0
0
0
0.00%
89,237,751
860
50
2,889
0.00%
Ground Water
Systems
0.6
72
42
33
50
57.78%
18,472,835
12,294,985
9,902,557
14,501,662
66.56%
2
72
19
14
24
25.78%
18,472,835
6,539,720
5,219,291
8,193,072
35.40%
6
72
5
3
7
6.59%
18,472,835
2,434,530
1,271,690
3,758,865
13.18%
10
72
2
1
3
2.29%
18,472,835
946,437
313,001
2,123,905
5.12%
20
72
0
0
1
0.33%
18,472,835
157,734
22,062
543,747
0.85%
60
72
0
0
0
0.01%
18,472,835
3,212
68
13,736
0.02%
100
72
0
0
0
0.00%
18,472,835
335
2
1,337
0.00%
200
72
0
0
0
0.00%
18,472,835
10
0
31
0.00%
600
72
0
0
0
0.00%
18,472,835
0
0
0
0.00%
Mixed Water
Systems
0.6
108
92
85
98
85.57%
34,271,098
28,901,766
25,205,894
31,625,574
84.33%
2
108
62
56
68
57.32%
34,271,098
18,206,602
16,183,847
21,078,612
53.13%
6
108
31
28
35
29.11%
34,271,098
10,121,833
9,176,502
11,134,416
29.53%
10
108
19
16
22
17.29%
34,271,098
6,662,872
5,822,138
7,584,698
19.44%
20
108
6
5
8
5.76%
34,271,098
3,710,343
3,374,463
4,172,078
10.83%
60
108
1
1
1
1.08%
34,271,098
2,493,809
2,161,451
2,730,674
7.28%
100
108
0
0
1
0.41%
34,271,098
1,104,692
623,588
1,701,390
3.22%
200
108
0
0
0
0.04%
34,271,098
104,268
32,151
245,539
0.30%
600
108
0
0
0
0.00%
34,271,098
482
47
1,691
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 5 of 30
December 2016

-------
B.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All Systems
0.6
1,198
694
605
781
57.94%
157,219,620
119,537,655
102,409,638
133,685,702
76.03%
2
1,198
359
314
413
30.01%
157,219,620
72,517,281
63,657,362
86,059,457
46.12%
6
1,198
164
144
187
13.68%
157,219,620
35,430,578
29,854,411
41,881,558
22.54%
10
1,198
103
89
120
8.63%
157,219,620
20,620,719
16,817,837
25,748,772
13.12%
20
1,198
48
39
58
4.01%
157,219,620
8,755,876
7,311,941
10,804,760
5.57%
60
1,198
12
8
16
0.99%
157,219,620
3,158,458
2,542,527
3,795,584
2.01%
100
1,198
6
3
8
0.47%
157,219,620
1,324,262
738,021
2,089,891
0.84%
200
1,198
2
0
3
0.13%
157,219,620
147,850
43,857
337,827
0.09%
600
1,198
0
0
0
0.01%
157,219,620
1,621
112
5,545
0.00%
Surface Water
Systems
0.6
560
399
363
433
71.28%
94,999,376
73,780,194
63,724,477
82,012,128
77.66%
2
560
217
196
241
38.71%
94,999,376
45,764,651
40,643,604
54,259,575
48.17%
6
560
103
94
113
18.36%
94,999,376
22,022,703
18,733,187
25,925,326
23.18%
10
560
67
60
75
12.03%
94,999,376
12,466,830
10,266,120
15,339,668
13.12%
20
560
34
29
39
6.06%
94,999,376
4,624,958
3,748,565
5,726,645
4.87%
60
560
9
6
12
1.62%
94,999,376
628,625
372,755
971,704
0.66%
100
560
4
2
6
0.75%
94,999,376
209,284
111,855
360,905
0.22%
200
560
1
0
2
0.19%
94,999,376
41,276
11,249
86,644
0.04%
600
560
0
0
0
0.01%
94,999,376
1,009
60
3,394
0.00%
Ground Water
Systems
0.6
475
157
118
199
33.12%
26,043,167
15,344,285
12,220,780
18,326,978
58.92%
2
475
51
37
69
10.75%
26,043,167
7,590,895
6,002,424
9,603,422
29.15%
6
475
12
8
18
2.54%
26,043,167
2,736,499
1,485,391
4,173,964
10.51%
10
475
5
3
8
1.07%
26,043,167
1,119,553
441,410
2,356,365
4.30%
20
475
2
1
3
0.32%
26,043,167
248,205
70,510
670,181
0.95%
60
475
0
0
1
0.04%
26,043,167
21,457
2,465
62,382
0.08%
100
475
0
0
0
0.01%
26,043,167
5,768
302
19,591
0.02%
200
475
0
0
0
0.00%
26,043,167
688
9
2,635
0.00%
600
475
0
0
0
0.00%
26,043,167
11
0
24
0.00%
Mixed Water
Systems
0.6
163
138
124
149
84.44%
36,177,076
30,413,176
26,464,381
33,346,596
84.07%
2
163
92
82
103
56.24%
36,177,076
19,161,735
17,011,334
22,196,460
52.97%
6
163
49
43
56
30.06%
36,177,076
10,671,376
9,635,834
11,782,268
29.50%
10
163
31
26
37
18.98%
36,177,076
7,034,335
6,110,306
8,052,739
19.44%
20
163
13
9
16
7.68%
36,177,076
3,882,713
3,492,866
4,407,935
10.73%
60
163
3
2
3
1.59%
36,177,076
2,508,376
2,167,307
2,761,498
6.93%
100
163
1
1
2
0.86%
36,177,076
1,109,210
625,864
1,709,396
3.07%
200
163
1
0
1
0.32%
36,177,076
105,886
32,598
248,548
0.29%
600
163
0
0
0
0.02%
36,177,076
600
52
2,127
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 6 of 30
December 2016

-------
B.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
378
170
146
194
44.93%
960,847
431,699
355,701
510,639
44.93%
2
378
56
46
66
14.72%
960,847
140,734
109,909
176,583
14.65%
6
378
12
10
15
3.16%
960,847
33,926
25,598
44,524
3.53%
10
378
6
4
7
1.48%
960,847
16,802
11,215
23,846
1.75%
20
378
2
2
3
0.60%
960,847
5,516
3,132
8,865
0.57%
60
378
1
1
1
0.25%
960,847
122
424
1,379
0.08%
100
378
1
0
1
0.15%
960,847
308
131
527
0.03%
200
378
0
0
0
0.04%
960,847
64
12
154
0.01%
600
378
0
0
0
0.00%
960,847
1
0
5
0.00%
Surface Water
Systems
0.6
188
121
111
132
64.61%
444,532
287,485
255,095
319,639
64.67%
2
188
45
39
50
23.75%
444,532
104,492
88,153
122,678
23.51%
6
188
10
9
12
5.48%
444,532
26,864
22,582
32,156
6.04%
10
188
5
4
6
2.70%
444,532
14,375
10,622
18,147
3.23%
20
188
2
2
3
1.17%
444,532
5,184
3,103
7,784
1.17%
60
188
1
1
1
0.51%
444,532
718
424
1,362
0.16%
100
188
1
0
1
0.30%
444,532
308
131
526
0.07%
200
188
0
0
0
0.07%
444,532
64
12
154
0.01%
600
188
0
0
0
0.00%
444,532
1
0
5
0.00%
Ground Water
Systems
0.6
183
43
31
55
23.29%
487,838
119,265
80,506
162,960
24.45%
2
183
8
5
11
4.45%
487,838
21,513
11,781
33,894
4.41%
6
183
1
0
2
0.47%
487,838
2,117
717
4,311
0.43%
10
183
0
0
1
0.13%
487,838
582
114
1,728
0.12%
20
183
0
0
0
0.02%
487,838
80
5
335
0.02%
60
183
0
0
0
0.00%
487,838
2
0
6
0.00%
100
183
0
0
0
0.00%
487,838
0
0
1
0.00%
200
183
0
0
0
0.00%
487,838
0
0
0
0.00%
600
183
0
0
0
0.00%
487,838
0
0
0
0.00%
Mixed Water
Systems
0.6
7
6
4
7
82.19%
28,477
24,949
20,100
28,041
87.61%
2
7
3
2
4
40.42%
28,477
14,729
9,975
20,011
51.72%
6
7
1
0
1
11.34%
28,477
4,945
2,299
8,057
17.36%
10
7
0
0
1
4.11%
28,477
1,845
478
3,971
6.48%
20
7
0
0
0
0.55%
28,477
253
24
746
0.89%
60
7
0
0
0
0.01%
28,477
3
0
11
0.01%
100
7
0
0
0
0.00%
28,477
0
0
1
0.00%
200
7
0
0
0
0.00%
28,477
0
0
0
0.00%
600
7
0
0
0
0.00%
28,477
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 7 of 30
December 2016

-------
B.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
All Systems
0.6
240
110
91
129
45.74%
9,965,053
4,777,391
3,915,449
5,646,962
47.94%
2
240
36
28
44
14.86%
9,965,053
1,641,273
1,304,950
2,021,185
16.47%
6
240
9
7
12
3.91%
9,965,053
489,716
398,334
605,185
4.91%
10
240
5
4
6
2.12%
9,965,053
307,911
254,785
374,370
3.09%
20
240
2
1
3
0.92%
9,965,053
175,134
117,066
222,217
1.76%
60
240
0
0
1
0.11%
9,965,053
24,579
4,164
62,365
0.25%
100
240
0
0
0
0.03%
9,965,053
6,259
437
20,384
0.06%
200
240
0
0
0
0.00%
9,965,053
708
11
2,702
0.01%
600
240
0
0
0
0.00%
9,965,053
11
0
24
0.00%
Surface Water
Systems
0.6
85
50
43
57
59.31%
3,398,940
2,044,939
1,751,656
2,341,308
60.16%
2
85
17
14
21
20.21%
3,398,940
705,285
574,222
853,120
20.75%
6
85
4
3
5
4.88%
3,398,940
181,626
141,480
229,220
5.34%
10
85
2
1
2
2.17%
3,398,940
82,994
52,446
117,239
2.44%
20
85
0
0
1
0.41%
3,398,940
16,310
5,863
32,788
0.48%
60
85
0
0
0
0.01%
3,398,940
283
28
969
0.01%
100
85
0
0
0
0.00%
3,398,940
24
1
100
0.00%
200
85
0
0
0
0.00%
3,398,940
0
0
2
0.00%
600
85
0
0
0
0.00%
3,398,940
0
0
0
0.00%
Ground Water
Systems
0.6
130
42
33
51
31.97%
5,358,353
1,855,715
1,458,386
2,277,390
34.63%
2
130
10
8
13
8.00%
5,358,353
515,237
389,677
652,533
9.62%
6
130
2
2
3
1.60%
5,358,353
136,719
115,518
165,094
2.55%
10
130
1
1
2
0.96%
5,358,353
101,825
92,647
112,697
1.90%
20
130
1
0
1
0.63%
5,358,353
75,048
44,055
93,438
1.40%
60
130
0
0
0
0.15%
5,358,353
17,751
2,360
46,954
0.33%
100
130
0
0
0
0.04%
5,358,353
5,368
298
18,002
0.10%
200
130
0
0
0
0.01%
5,358,353
676
9
2,595
0.01%
600
130
0
0
0
0.00%
5,358,353
11
0
24
0.00%
Mixed Water
Systems
0.6
25
18
15
21
71.20%
1,207,761
876,738
705,407
1,028,264
72.59%
2
25
8
7
10
32.37%
1,207,761
420,751
341,051
515,532
34.84%
6
25
3
3
4
12.58%
1,207,761
171,370
141,335
210,871
14.19%
10
25
2
2
2
7.98%
1,207,761
123,092
109,691
144,434
10.19%
20
25
1
1
1
4.19%
1,207,761
83,775
67,148
95,990
6.94%
60
25
0
0
0
0.30%
1,207,761
6,544
1,777
14,442
0.54%
100
25
0
0
0
0.04%
1,207,761
868
137
2,282
0.07%
200
25
0
0
0
0.00%
1,207,761
32
2
105
0.00%
600
25
0
0
0
0.00%
1,207,761
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 8 of 30
December 2016

-------
B.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All Systems
0.6
207
122
106
138
58.88%
70,477,886
45,322,099
37,077,002
53,100,452
64.31%
2
207
45
38
54
21.83%
70,477,886
16,818,119
13,245,992
22,147,167
23.86%
6
207
13
11
15
6.31%
70,477,886
5,282,334
3,930,771
6,626,904
7.50%
10
207
7
6
9
3.56%
70,477,886
2,490,544
1,505,984
3,830,949
3.53%
20
207
4
3
5
1.80%
70,477,886
807,909
527,294
1,296,636
1.15%
60
207
1
0
1
0.25%
70,477,886
91,062
26,658
197,602
0.13%
100
207
0
0
0
0.05%
70,477,886
18,256
2,934
50,911
0.03%
200
207
0
0
0
0.00%
70,477,886
1,184
78
3,829
0.00%
600
207
0
0
0
0.00%
70,477,886
4
0
16
0.00%
Surface Water
Systems
0.6
110
61
54
69
55.33%
41,269,868
25,786,693
21,951,559
30,010,866
62.48%
2
110
19
15
22
16.84%
41,269,868
9,458,608
7,692,587
12,056,027
22.92%
6
110
5
4
5
4.16%
41,269,868
3,069,607
2,205,161
3,918,219
7.44%
10
110
3
2
3
2.53%
41,269,868
1,439,572
829,262
2,216,972
3.49%
20
110
2
1
2
1.59%
41,269,868
454,067
297,344
677,188
1.10%
60
110
0
0
1
0.29%
41,269,868
61,402
15,660
135,655
0.15%
100
110
0
0
0
0.07%
41,269,868
14,002
1,941
39,655
0.03%
200
110
0
0
0
0.01%
41,269,868
1,012
58
3,278
0.00%
600
110
0
0
0
0.00%
41,269,868
4
0
14
0.00%
Ground Water
Systems
0.6
45
22
17
26
48.28%
11,230,816
6,333,361
4,887,138
7,678,997
56.39%
2
45
8
6
10
17.04%
11,230,816
2,392,743
1,835,215
3,151,714
21.31%
6
45
2
1
2
3.45%
11,230,816
891,802
603,852
1,136,666
7.94%
10
45
0
0
1
1.11%
11,230,816
347,328
131,440
733,519
3.09%
20
45
0
0
0
0.17%
11,230,816
61,543
7,679
226,877
0.55%
60
45
0
0
0
0.00%
11,230,816
1,696
20
7,893
0.02%
100
45
0
0
0
0.00%
11,230,816
206
1
853
0.00%
200
45
0
0
0
0.00%
11,230,816
7
0
22
0.00%
600
45
0
0
0
0.00%
11,230,816
0
0
0
0.00%
Mixed Water
Systems
0.6
52
39
35
43
75.57%
17,977,203
13,202,045
10,238,305
15,410,589
73.44%
2
52
19
17
22
36.55%
17,977,203
4,966,768
3,718,190
6,939,426
27.63%
6
52
7
6
8
13.31%
17,977,203
1,320,925
1,121,758
1,572,019
7.35%
10
52
4
3
5
7.85%
17,977,203
703,643
545,282
880,458
3.91%
20
52
2
1
2
3.64%
17,977,203
292,299
222,272
392,571
1.63%
60
52
0
0
0
0.36%
17,977,203
27,964
10,977
54,054
0.16%
100
52
0
0
0
0.05%
17,977,203
4,048
992
10,402
0.02%
200
52
0
0
0
0.00%
17,977,203
165
19
529
0.00%
600
52
0
0
0
0.00%
17,977,203
0
0
1
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 9 of 30
December 2016

-------
B.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All Systems
0.6
825
402
343
461
48.67%
81,403,786
50,531,189
41,348,151
59,258,054
62.07%
2
825
136
113
163
16.54%
81,403,786
18,600,126
14,660,851
24,344,934
22.85%
6
825
34
28
42
4.17%
81,403,786
5,805,975
4,354,703
7,276,613
7.13%
10
825
18
14
23
2.19%
81,403,786
2,815,257
1,771,984
4,229,164
3.46%
20
825
8
6
11
0.99%
81,403,786
988,559
647,492
1,527,719
1.21%
60
825
2
1
3
0.21%
81,403,786
116,362
31,246
261,346
0.14%
100
825
1
0
1
0.09%
81,403,786
24,823
3,501
71,822
0.03%
200
825
0
0
0
0.02%
81,403,786
1,956
101
6,685
0.00%
600
825
0
0
0
0.00%
81,403,786
17
0
45
0.00%
Surface Water
Systems
0.6
383
233
208
258
60.77%
45,113,339
28,119,116
23,958,309
32,671,812
62.33%
2
383
80
69
93
20.98%
45,113,339
10,268,385
8,354,962
13,031,825
22.76%
6
383
19
16
23
4.97%
45,113,339
3,278,096
2,369,223
4,179,594
7.27%
10
383
10
8
12
2.53%
45,113,339
1,536,942
892,331
2,352,359
3.41%
20
383
4
3
5
1.12%
45,113,339
475,561
306,309
717,760
1.05%
60
383
1
1
2
0.34%
45,113,339
62,402
16,112
137,986
0.14%
100
383
1
0
1
0.17%
45,113,339
14,333
2,073
40,282
0.03%
200
383
0
0
0
0.04%
45,113,339
1,076
70
3,434
0.00%
600
383
0
0
0
0.00%
45,113,339
5
0
19
0.00%
Ground Water
Systems
0.6
358
106
81
132
29.58%
17,077,006
8,308,341
6,426,031
10,119,347
48.65%
2
358
26
19
34
7.32%
17,077,006
2,929,493
2,236,672
3,838,140
17.15%
6
358
4
3
6
1.25%
17,077,006
1,030,639
720,087
1,306,072
6.04%
10
358
2
1
3
0.55%
17,077,006
449,735
224,202
847,943
2.63%
20
358
1
0
1
0.26%
17,077,006
136,671
51,739
320,651
0.80%
60
358
0
0
1
0.05%
17,077,006
19,449
2,380
54,853
0.11%
100
358
0
0
0
0.02%
17,077,006
5,574
299
18,856
0.03%
200
358
0
0
0
0.00%
17,077,006
683
9
2,617
0.00%
600
358
0
0
0
0.00%
17,077,006
11
0
24
0.00%
Mixed Water
Systems
0.6
84
63
54
71
74.82%
19,213,441
14,103,732
10,963,811
16,466,894
73.41%
2
84
30
25
36
35.63%
19,213,441
5,402,248
4,069,216
7,474,969
28.12%
6
84
11
9
13
12.93%
19,213,441
1,497,240
1,265,393
1,790,946
7.79%
10
84
6
5
8
7.58%
19,213,441
828,579
655,451
1,028,863
4.31%
20
84
3
2
4
3.55%
19,213,441
376,327
289,444
489,307
1.96%
60
84
0
0
1
0.31%
19,213,441
34,511
12,754
68,507
0.18%
100
84
0
0
0
0.04%
19,213,441
4,915
1,129
12,685
0.03%
200
84
0
0
0
0.00%
19,213,441
197
21
634
0.00%
600
84
0
0
0
0.00%
19,213,441
0
0
1
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 10 of 30
December 2016

-------
B.3 - CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
20
20
18
20
97.83%
83,754
81,583
72,872
83,752
97.41%
2
20
18
16
19
87.74%
83,754
71,406
63,557
80,356
85.26%
6
20
13
11
15
64.25%
83,754
49,830
42,656
58,726
59.50%
10
20
10
9
12
50.86%
83,754
40,743
36,033
47,188
48.65%
20
20
7
6
8
36.29%
83,754
31,560
27,972
35,158
37.68%
60
20
3
3
4
17.32%
83,754
16,340
13,156
19,809
19.51%
100
20
2
2
3
11.05%
83,754
10,635
7,628
13,411
12.70%
200
20
1
0
2
4.58%
83,754
4,351
1,354
7,859
5.19%
600
20
0
0
0
0.27%
83,754
237
13
823
0.28%
Surface Water
Systems
0.6
14
14
13
14
99.18%
54,146
53,881
52,494
54,146
99.51%
2
14
13
13
14
94.49%
54,146
51,876
49,909
53,478
95.81%
6
14
11
10
12
77.45%
54,146
42,416
38,496
46,548
78.34%
10
14
9
8
10
62.88%
54,146
36,121
32,626
39,937
66.71%
20
14
6
5
7
44.29%
54,146
28,112
24,709
31,168
51.92%
60
14
2
2
3
17.66%
54,146
13,114
10,080
16,541
24.22%
100
14
1
1
2
9.41%
54,146
7,725
5,582
10,161
14.27%
200
14
0
0
1
3.14%
54,146
2,802
912
5,084
5.17%
600
14
0
0
0
0.13%
54,146
118
8
388
0.22%
Ground Water
Systems
0.6
3
3
2
3
92.02%
10,110
8,870
5,301
10,108
87.74%
2
3
2
1
3
66.89%
10,110
5,664
3,867
8,620
56.02%
6
3
1
0
1
24.26%
10,110
1,911
540
3,748
18.91%
10
3
0
0
1
9.77%
10,110
762
104
2,178
7.53%
20
3
0
0
0
1.69%
10,110
132
5
512
1.30%
60
3
0
0
0
0.03%
10,110
2
0
11
0.02%
100
3
0
0
0
0.00%
10,110
0
0
1
0.00%
200
3
0
0
0
0.00%
10,110
0
0
0
0.00%
600
3
0
0
0
0.00%
10,110
0
0
0
0.00%
Mixed Water
Systems
0.6
3
3
2
3
97.31%
19,498
18,832
15,077
19,498
96.59%
2
3
2
2
3
77.10%
19,498
13,866
9,781
18,259
71.12%
6
3
1
1
2
42.63%
19,498
5,502
3,619
8,430
28.22%
10
3
1
1
1
35.83%
19,498
3,860
3,302
5,073
19.79%
20
3
1
1
1
33.58%
19,498
3,316
3,258
3,479
17.01%
60
3
1
1
1
32.99%
19,498
3,224
3,076
3,257
16.53%
100
3
1
1
1
29.78%
19,498
2,910
2,047
3,250
14.92%
200
3
0
0
1
15.85%
19,498
1,549
443
2,775
7.94%
600
3
0
0
0
1.21%
19,498
118
5
435
0.61%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 11 of 30
December 2016

-------
B.3 - CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
All Systems
0.6
55
49
46
52
89.63%
2,969,366
2,669,541
2,484,640
2,815,481
89.90%
2
55
36
33
40
66.06%
2,969,366
1,973,217
1,790,498
2,170,504
66.45%
6
55
21
18
23
37.79%
2,969,366
1,129,420
995,477
1,278,812
38.04%
10
55
15
12
17
26.41%
2,969,366
783,118
668,277
908,928
26.37%
20
55
7
6
9
13.29%
2,969,366
380,519
299,698
475,877
12.81%
60
55
2
1
2
2.77%
2,969,366
64,808
33,630
107,393
2.18%
100
55
1
0
1
0.96%
2,969,366
18,783
6,792
38,840
0.63%
200
55
0
0
0
0.14%
2,969,366
2,192
410
5,774
0.07%
600
55
0
0
0
0.00%
2,969,366
26
1
98
0.00%
Surface Water
Systems
0.6
30
29
29
30
97.98%
1,609,787
1,574,280
1,526,037
1,606,184
97.79%
2
30
24
23
26
81.22%
1,609,787
1,292,044
1,205,711
1,383,142
80.26%
6
30
14
13
16
48.06%
1,609,787
764,476
702,918
837,507
47.49%
10
30
10
10
11
34.92%
1,609,787
554,623
504,032
606,470
34.45%
20
30
6
5
7
19.49%
1,609,787
302,192
257,281
349,961
18.77%
60
30
1
1
2
4.80%
1,609,787
60,627
32,961
95,133
3.77%
100
30
1
0
1
1.72%
1,609,787
18,152
6,737
36,574
1.13%
200
30
0
0
0
0.26%
1,609,787
2,162
410
5,665
0.13%
600
30
0
0
0
0.00%
1,609,787
26
1
97
0.00%
Ground Water
Systems
0.6
21
16
14
18
75.74%
1,095,758
831,440
694,782
945,476
75.88%
2
21
8
6
10
37.99%
1,095,758
418,086
324,641
523,542
38.15%
6
21
3
2
4
13.73%
1,095,758
134,955
90,312
186,327
12.32%
10
21
1
1
2
6.86%
1,095,758
61,335
34,507
92,887
5.60%
20
21
0
0
1
1.75%
1,095,758
14,139
4,340
28,679
1.29%
60
21
0
0
0
0.06%
1,095,758
476
37
1,633
0.04%
100
21
0
0
0
0.01%
1,095,758
63
2
248
0.01%
200
21
0
0
0
0.00%
1,095,758
3
0
9
0.00%
600
21
0
0
0
0.00%
1,095,758
0
0
0
0.00%
Mixed Water
Systems
0.6
4
4
4
4
100.00%
263,821
263,821
263,821
263,821
100.00%
2
4
4
4
4
99.71%
263,821
263,086
260,146
263,820
99.72%
6
4
3
3
4
87.04%
263,821
229,990
202,247
254,978
87.18%
10
4
3
2
3
65.17%
263,821
167,160
129,739
209,571
63.36%
20
4
1
1
2
27.35%
263,821
64,188
38,077
97,238
24.33%
60
4
0
0
0
1.70%
263,821
3,705
632
10,626
1.40%
100
4
0
0
0
0.26%
263,821
567
53
2,019
0.22%
200
4
0
0
0
0.01%
263,821
27
1
101
0.01%
600
4
0
0
0
0.00%
263,821
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 12 of 30
December 2016

-------
B.3 - CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All Systems
0.6
129
124
119
127
95.92%
40,196,393
39,251,285
38,303,945
39,868,911
97.65%
2
129
103
99
109
80.16%
40,196,393
33,994,057
32,118,835
35,664,557
84.57%
6
129
60
56
65
46.58%
40,196,393
19,061,347
16,864,090
21,455,362
47.42%
10
129
37
34
41
29.03%
40,196,393
11,253,224
9,679,599
13,243,607
28.00%
20
129
15
12
17
11.32%
40,196,393
4,063,614
3,320,393
5,007,246
10.11%
60
129
2
2
3
1.77%
40,196,393
487,860
311,295
714,503
1.21%
100
129
1
1
1
0.80%
40,196,393
166,115
96,407
267,656
0.41%
200
129
0
0
1
0.22%
40,196,393
34,816
9,777
71,385
0.09%
600
129
0
0
0
0.01%
40,196,393
855
50
2,875
0.00%
Surface Water
Systems
0.6
84
82
80
83
97.23%
30,089,884
29,590,098
29,050,931
29,930,898
98.34%
2
84
70
68
73
83.81%
30,089,884
25,994,395
24,892,193
27,013,043
86.39%
6
84
43
41
45
51.09%
30,089,884
14,953,312
13,818,310
16,098,060
49.70%
10
84
28
26
30
33.13%
30,089,884
9,078,435
8,163,539
10,042,549
30.17%
20
84
12
11
14
14.62%
30,089,884
3,563,213
3,035,499
4,114,122
11.84%
60
84
2
2
3
2.66%
30,089,884
477,306
308,094
687,921
1.59%
100
84
1
1
1
1.22%
30,089,884
165,102
96,206
264,666
0.55%
200
84
0
0
1
0.34%
30,089,884
34,792
9,774
71,296
0.12%
600
84
0
0
0
0.01%
30,089,884
855
50
2,875
0.00%
Ground Water
Systems
0.6
17
15
13
16
85.76%
5,268,728
4,910,586
4,663,776
5,103,857
93.20%
2
17
9
8
11
54.68%
5,268,728
3,874,319
3,326,331
4,287,141
73.53%
6
17
3
2
4
17.97%
5,268,728
1,522,481
666,784
2,546,659
28.90%
10
17
1
1
2
6.61%
5,268,728
595,317
181,485
1,374,740
11.30%
20
17
0
0
0
0.97%
5,268,728
95,932
14,382
315,799
1.82%
60
17
0
0
0
0.01%
5,268,728
1,514
48
5,840
0.03%
100
17
0
0
0
0.00%
5,268,728
128
2
483
0.00%
200
17
0
0
0
0.00%
5,268,728
3
0
9
0.00%
600
17
0
0
0
0.00%
5,268,728
0
0
0
0.00%
Mixed Water
Systems
0.6
28
27
27
28
98.14%
4,837,781
4,750,602
4,589,238
4,834,156
98.20%
2
28
24
22
25
84.68%
4,837,781
4,125,342
3,900,312
4,364,373
85.27%
6
28
14
13
15
50.41%
4,837,781
2,585,554
2,378,996
2,810,643
53.45%
10
28
9
7
10
30.36%
4,837,781
1,579,472
1,334,574
1,826,318
32.65%
20
28
2
2
3
7.69%
4,837,781
404,469
270,511
577,325
8.36%
60
28
0
0
0
0.17%
4,837,781
9,040
3,153
20,742
0.19%
100
28
0
0
0
0.02%
4,837,781
885
199
2,506
0.02%
200
28
0
0
0
0.00%
4,837,781
22
2
80
0.00%
600
28
0
0
0
0.00%
4,837,781
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 13 of 30
December 2016

-------
B.3 - CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All Systems
0.6
204
193
183
199
94.41%
43,249,513
42,002,409
40,861,457
42,768,144
97.12%
2
204
157
148
168
77.10%
43,249,513
36,038,680
33,972,891
37,915,417
83.33%
6
204
94
85
102
45.94%
43,249,513
20,240,597
17,902,223
22,792,901
46.80%
10
204
62
55
69
30.47%
43,249,513
12,077,085
10,383,909
14,199,722
27.92%
20
204
29
25
34
14.30%
43,249,513
4,475,693
3,648,063
5,518,281
10.35%
60
204
7
5
9
3.56%
43,249,513
569,008
358,080
841,704
1.32%
100
204
4
2
5
1.85%
43,249,513
195,532
110,827
319,906
0.45%
200
204
1
0
2
0.63%
43,249,513
41,359
11,541
85,019
0.10%
600
204
0
0
0
0.03%
43,249,513
1,118
64
3,796
0.00%
Surface Water
Systems
0.6
128
125
122
127
97.62%
31,753,817
31,218,259
30,629,461
31,591,228
98.31%
2
128
108
104
112
84.37%
31,753,817
27,338,316
26,147,813
28,449,663
86.09%
6
128
68
64
72
53.27%
31,753,817
15,760,204
14,559,724
16,982,115
49.63%
10
128
47
43
51
36.80%
31,753,817
9,669,180
8,700,197
10,688,955
30.45%
20
128
24
21
27
19.01%
31,753,817
3,893,517
3,317,489
4,495,250
12.26%
60
128
6
4
8
4.80%
31,753,817
551,047
351,134
799,595
1.74%
100
128
3
2
4
2.24%
31,753,817
190,978
108,525
311,400
0.60%
200
128
1
0
2
0.63%
31,753,817
39,756
11,096
82,045
0.13%
600
128
0
0
0
0.02%
31,753,817
1,000
59
3,360
0.00%
Ground Water
Systems
0.6
41
33
29
37
81.08%
6,374,596
5,750,895
5,363,860
6,059,441
90.22%
2
41
19
16
23
47.02%
6,374,596
4,298,069
3,654,839
4,819,303
67.42%
6
41
7
4
9
16.26%
6,374,596
1,659,347
757,636
2,736,734
26.03%
10
41
3
1
5
6.97%
6,374,596
657,413
216,096
1,469,805
10.31%
20
41
1
0
1
1.42%
6,374,596
110,203
18,727
344,990
1.73%
60
41
0
0
0
0.04%
6,374,596
1,992
85
7,484
0.03%
100
41
0
0
0
0.01%
6,374,596
192
4
732
0.00%
200
41
0
0
0
0.00%
6,374,596
5
0
18
0.00%
600
41
0
0
0
0.00%
6,374,596
0
0
0
0.00%
Mixed Water
Systems
0.6
35
34
33
35
98.28%
5,121,100
5,033,255
4,868,136
5,117,475
98.28%
2
35
30
28
32
85.75%
5,121,100
4,402,295
4,170,239
4,646,452
85.96%
6
35
19
17
21
53.93%
5,121,100
2,821,046
2,584,863
3,074,051
55.09%
10
35
12
10
14
34.81%
5,121,100
1,750,492
1,467,616
2,040,962
34.18%
20
35
4
3
6
12.16%
5,121,100
471,973
311,847
678,041
9.22%
60
35
1
1
1
3.16%
5,121,100
15,969
6,861
34,625
0.31%
100
35
1
1
1
2.60%
5,121,100
4,362
2,298
7,775
0.09%
200
35
0
0
1
1.36%
5,121,100
1,598
446
2,957
0.03%
600
35
0
0
0
0.10%
5,121,100
118
5
436
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 14 of 30
December 2016

-------
B.4 - CA with CL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
25
24
22
25
94.25%
112,710
108,362
101,024
112,291
96.14%
2
25
21
19
22
82.60%
112,710
96,716
88,749
104,567
85.81%
6
25
16
14
17
62.41%
112,710
74,483
68,179
80,703
66.08%
10
25
12
11
14
48.02%
112,710
56,082
46,709
65,159
49.76%
20
25
7
5
8
26.73%
112,710
28,710
21,578
37,739
25.47%
60
25
2
1
2
7.19%
112,710
7,610
4,567
10,650
6.75%
100
25
1
0
1
2.92%
112,710
2,920
1,207
5,353
2.59%
200
25
0
0
0
0.46%
112,710
399
84
959
0.35%
600
25
0
0
0
0.01%
112,710
4
0
14
0.00%
Surface Water
Systems
0.6
14
14
13
14
98.79%
65,078
64,257
61,064
65,075
98.74%
2
14
12
12
13
88.75%
65,078
57,736
53,508
61,792
88.72%
6
14
9
8
10
63.89%
65,078
43,394
39,945
46,374
66.68%
10
14
7
6
8
48.14%
65,078
33,035
28,155
37,673
50.76%
20
14
4
3
5
26.93%
65,078
17,731
14,003
22,721
27.25%
60
14
2
1
2
10.76%
65,078
6,690
4,205
8,796
10.28%
100
14
1
0
1
4.84%
65,078
2,762
1,168
4,961
4.24%
200
14
0
0
0
0.79%
65,078
391
83
932
0.60%
600
14
0
0
0
0.01%
65,078
4
0
14
0.01%
Ground Water
Systems
0.6
3
2
1
3
57.80%
8,741
5,221
1,091
8,325
59.73%
2
3
0
0
1
14.86%
8,741
1,366
46
3,940
15.63%
6
3
0
0
0
1.19%
8,741
109
0
511
1.24%
10
3
0
0
0
0.23%
8,741
21
0
96
0.24%
20
3
0
0
0
0.02%
8,741
1
0
5
0.02%
60
3
0
0
0
0.00%
8,741
0
0
0
0.00%
100
3
0
0
0
0.00%
8,741
0
0
0
0.00%
200
3
0
0
0
0.00%
8,741
0
0
0
0.00%
600
3
0
0
0
0.00%
8,741
0
0
0
0.00%
Mixed Water
Systems
0.6
8
8
8
8
99.99%
38,891
38,885
38,869
38,891
99.98%
2
8
8
7
8
97.22%
38,891
37,614
35,196
38,835
96.72%
6
8
7
6
7
82.77%
38,891
30,980
28,234
33,818
79.66%
10
8
5
5
6
65.73%
38,891
23,026
18,553
27,390
59.21%
20
8
3
2
4
36.41%
38,891
10,978
7,574
15,013
28.23%
60
8
0
0
1
3.62%
38,891
920
362
1,854
2.36%
100
8
0
0
0
0.66%
38,891
158
38
392
0.41%
200
8
0
0
0
0.04%
38,891
9
1
27
0.02%
600
8
0
0
0
0.00%
38,891
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 15 of 30
December 2016

-------
B.4 - CA with CL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
All Systems
0.6
9
8
6
9
90.57%
369,899
332,459
253,734
369,557
89.88%
2
9
6
4
8
63.09%
369,899
237,452
184,495
310,964
64.19%
6
9
2
2
3
26.11%
369,899
111,185
81,833
144,891
30.06%
10
9
1
1
2
11.84%
369,899
53,400
26,421
81,057
14.44%
20
9
0
0
0
2.12%
369,899
9,919
2,322
23,605
2.68%
60
9
0
0
0
0.04%
369,899
172
10
635
0.05%
100
9
0
0
0
0.00%
369,899
16
0
63
0.00%
200
9
0
0
0
0.00%
369,899
0
0
1
0.00%
600
9
0
0
0
0.00%
369,899
0
0
0
0.00%
Surface Water
Systems
0.6
2
2
1
2
91.61%
69,623
64,234
43,684
69,620
92.26%
2
2
1
0
2
48.98%
69,623
35,239
13,190
57,428
50.61%
6
2
0
0
0
6.02%
69,623
4,421
237
13,118
6.35%
10
2
0
0
0
1.19%
69,623
882
16
3,305
1.27%
20
2
0
0
0
0.07%
69,623
52
0
208
0.08%
60
2
0
0
0
0.00%
69,623
0
0
0
0.00%
100
2
0
0
0
0.00%
69,623
0
0
0
0.00%
200
2
0
0
0
0.00%
69,623
0
0
0
0.00%
600
2
0
0
0
0.00%
69,623
0
0
0
0.00%
Ground Water
Systems
0.6
1
1
0
1
56.51%
51,848
29,298
532
51,520
56.51%
2
1
0
0
1
13.95%
51,848
7,232
1
29,445
13.95%
6
1
0
0
0
1.18%
51,848
609
0
3,045
1.18%
10
1
0
0
0
0.26%
51,848
132
0
555
0.26%
20
1
0
0
0
0.02%
51,848
11
0
22
0.02%
60
1
0
0
0
0.00%
51,848
0
0
0
0.00%
100
1
0
0
0
0.00%
51,848
0
0
0
0.00%
200
1
0
0
0
0.00%
51,848
0
0
0
0.00%
600
1
0
0
0
0.00%
51,848
0
0
0
0.00%
Mixed Water
Systems
0.6
6
6
5
6
95.90%
248,428
238,927
209,517
248,416
96.18%
2
6
5
4
5
75.98%
248,428
194,981
171,304
224,091
78.49%
6
6
2
2
3
36.97%
248,428
106,155
81,597
128,729
42.73%
10
6
1
1
2
17.33%
248,428
52,385
26,404
77,197
21.09%
20
6
0
0
0
3.15%
248,428
9,855
2,322
23,375
3.97%
60
6
0
0
0
0.05%
248,428
172
10
635
0.07%
100
6
0
0
0
0.01%
248,428
16
0
63
0.01%
200
6
0
0
0
0.00%
248,428
0
0
1
0.00%
600
6
0
0
0
0.00%
248,428
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 16 of 30
December 2016

-------
B.4 - CA with CL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All Systems
0.6
45
42
38
44
92.26%
21,363,993
20,086,523
18,728,162
21,177,392
94.02%
2
45
30
26
33
65.78%
21,363,993
15,858,998
14,401,554
17,468,699
74.23%
6
45
15
13
17
33.34%
21,363,993
8,965,133
7,358,321
11,043,614
41.96%
10
45
9
7
10
19.16%
21,363,993
5,535,346
4,555,563
6,993,427
25.91%
20
45
3
2
4
6.74%
21,363,993
3,231,490
2,984,725
3,653,539
15.13%
60
45
1
1
1
2.18%
21,363,993
2,463,713
2,148,475
2,675,756
11.53%
100
45
0
0
1
0.93%
21,363,993
1,100,703
622,475
1,691,642
5.15%
200
45
0
0
0
0.09%
21,363,993
104,122
32,131
245,103
0.49%
600
45
0
0
0
0.00%
21,363,993
481
47
1,690
0.00%
Surface Water
Systems
0.6
17
16
14
17
91.32%
9,764,629
9,022,545
8,328,288
9,650,080
92.40%
2
17
11
10
12
65.26%
9,764,629
6,829,443
5,972,440
7,708,277
69.94%
6
17
5
4
6
31.12%
9,764,629
2,853,358
1,741,225
4,431,472
29.22%
10
17
3
2
4
16.46%
9,764,629
1,196,825
626,068
2,206,030
12.26%
20
17
1
0
1
5.27%
9,764,629
223,197
103,736
468,576
2.29%
60
17
0
0
0
0.31%
9,764,629
6,969
1,155
20,140
0.07%
100
17
0
0
0
0.05%
9,764,629
950
78
3,181
0.01%
200
17
0
0
0
0.00%
9,764,629
41
1
173
0.00%
600
17
0
0
0
0.00%
9,764,629
0
0
0
0.00%
Ground Water
Systems
0.6
4
3
2
4
78.43%
560,393
433,552
281,574
542,949
77.37%
2
4
1
0
2
30.03%
560,393
158,441
56,835
287,620
28.27%
6
4
0
0
0
2.76%
560,393
14,380
1,052
46,406
2.57%
10
4
0
0
0
0.54%
560,393
2,831
75
11,370
0.51%
20
4
0
0
0
0.04%
560,393
201
1
854
0.04%
60
4
0
0
0
0.00%
560,393
1
0
3
0.00%
100
4
0
0
0
0.00%
560,393
0
0
0
0.00%
200
4
0
0
0
0.00%
560,393
0
0
0
0.00%
600
4
0
0
0
0.00%
560,393
0
0
0
0.00%
Mixed Water
Systems
0.6
24
23
22
24
95.23%
11,038,971
10,630,427
10,118,300
10,984,363
96.30%
2
24
17
16
19
72.10%
11,038,971
8,871,114
8,372,279
9,472,802
80.36%
6
24
10
9
11
40.00%
11,038,971
6,097,395
5,616,044
6,565,736
55.24%
10
24
6
5
7
24.17%
11,038,971
4,335,690
3,929,420
4,776,026
39.28%
20
24
2
2
3
8.91%
11,038,971
3,008,092
2,880,988
3,184,109
27.25%
60
24
1
1
1
3.87%
11,038,971
2,456,742
2,147,319
2,655,613
22.26%
100
24
0
0
1
1.70%
11,038,971
1,099,753
622,397
1,688,460
9.96%
200
24
0
0
0
0.16%
11,038,971
104,081
32,130
244,929
0.94%
600
24
0
0
0
0.00%
11,038,971
481
47
1,690
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 17 of 30
December 2016

-------
B.4 - CA with CL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All Systems
0.6
79
73
66
78
92.70%
21,846,602
20,527,344
19,082,920
21,659,240
93.96%
2
79
56
49
63
70.79%
21,846,602
16,193,166
14,674,798
17,884,230
74.12%
6
79
33
29
37
41.71%
21,846,602
9,150,801
7,508,333
11,269,208
41.89%
10
79
22
18
25
27.46%
21,846,602
5,644,828
4,628,693
7,139,643
25.84%
20
79
10
8
12
12.54%
21,846,602
3,270,119
3,008,624
3,714,883
14.97%
60
79
3
2
4
3.52%
21,846,602
2,471,494
2,153,052
2,687,040
11.31%
100
79
1
1
2
1.45%
21,846,602
1,103,639
623,682
1,697,057
5.05%
200
79
0
0
0
0.19%
21,846,602
104,522
32,214
246,063
0.48%
600
79
0
0
0
0.00%
21,846,602
486
48
1,705
0.00%
Surface Water
Systems
0.6
33
31
29
33
94.51%
9,899,330
9,151,035
8,433,036
9,784,775
92.44%
2
33
24
22
27
74.24%
9,899,330
6,922,419
6,039,138
7,827,497
69.93%
6
33
14
13
16
43.50%
9,899,330
2,901,173
1,781,407
4,490,963
29.31%
10
33
10
8
11
28.97%
9,899,330
1,230,743
654,240
2,247,009
12.43%
20
33
5
4
6
14.14%
9,899,330
240,980
117,740
491,505
2.43%
60
33
2
1
2
4.72%
9,899,330
13,660
5,361
28,936
0.14%
100
33
1
0
1
2.08%
9,899,330
3,712
1,246
8,142
0.04%
200
33
0
0
0
0.34%
9,899,330
432
84
1,105
0.00%
600
33
0
0
0
0.00%
9,899,330
4
0
15
0.00%
Ground Water
Systems
0.6
8
5
3
8
67.95%
620,982
468,071
283,198
602,794
75.38%
2
8
2
0
4
22.33%
620,982
167,038
56,883
321,005
26.90%
6
8
0
0
1
1.97%
620,982
15,098
1,052
49,962
2.43%
10
8
0
0
0
0.39%
620,982
2,984
75
12,021
0.48%
20
8
0
0
0
0.03%
620,982
213
1
881
0.03%
60
8
0
0
0
0.00%
620,982
1
0
3
0.00%
100
8
0
0
0
0.00%
620,982
0
0
0
0.00%
200
8
0
0
0
0.00%
620,982
0
0
0
0.00%
600
8
0
0
0
0.00%
620,982
0
0
0
0.00%
Mixed Water
Systems
0.6
38
37
35
38
96.34%
11,326,290
10,908,238
10,366,686
11,271,670
96.31%
2
38
30
27
32
78.00%
11,326,290
9,103,709
8,578,778
9,735,729
80.38%
6
38
18
17
20
48.53%
11,326,290
6,234,531
5,725,875
6,728,283
55.04%
10
38
12
10
14
31.84%
11,326,290
4,411,101
3,974,378
4,880,613
38.95%
20
38
5
4
7
13.79%
11,326,290
3,028,926
2,890,884
3,222,497
26.74%
60
38
1
1
2
3.22%
11,326,290
2,457,833
2,147,691
2,658,102
21.70%
100
38
0
0
1
1.22%
11,326,290
1,099,927
622,436
1,688,915
9.71%
200
38
0
0
0
0.11%
11,326,290
104,090
32,131
244,958
0.92%
600
38
0
0
0
0.00%
11,326,290
481
47
1,690
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 18 of 30
December 2016

-------
B.5- CL with OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
1
0
0
1
44.73%
9,001
4,026
12
8,970
44.73%
2
1
0
0
0
8.62%
9,001
776
0
4,455
8.62%
6
1
0
0
0
0.39%
9,001
35
0
196
0.39%
10
1
0
0
0
0.05%
9,001
4
0
20
0.05%
20
1
0
0
0
0.00%
9,001
0
0
0
0.00%
60
1
0
0
0
0.00%
9,001
0
0
0
0.00%
100
1
0
0
0
0.00%
9,001
0
0
0
0.00%
200
1
0
0
0
0.00%
9,001
0
0
0
0.00%
600
1
0
0
0
0.00%
9,001
0
0
0
0.00%
Surface Water
Systems
0.6
1
0
0
1
44.73%
9,001
4,026
12
8,970
44.73%
2
1
0
0
0
8.62%
9,001
776
0
4,455
8.62%
6
1
0
0
0
0.39%
9,001
35
0
196
0.39%
10
1
0
0
0
0.05%
9,001
4
0
20
0.05%
20
1
0
0
0
0.00%
9,001
0
0
0
0.00%
60
1
0
0
0
0.00%
9,001
0
0
0
0.00%
100
1
0
0
0
0.00%
9,001
0
0
0
0.00%
200
1
0
0
0
0.00%
9,001
0
0
0
0.00%
600
1
0
0
0
0.00%
9,001
0
0
0
0.00%
Ground Water
Systems
0.6
0
0
0
0
0.00%
0
0
0
0
0.00%
2
0
0
0
0
0.00%
0
0
0
0
0.00%
6
0
0
0
0
0.00%
0
0
0
0
0.00%
10
0
0
0
0
0.00%
0
0
0
0
0.00%
20
0
0
0
0
0.00%
0
0
0
0
0.00%
60
0
0
0
0
0.00%
0
0
0
0
0.00%
100
0
0
0
0
0.00%
0
0
0
0
0.00%
200
0
0
0
0
0.00%
0
0
0
0
0.00%
600
0
0
0
0
0.00%
0
0
0
0
0.00%
Mixed Water
Systems
0.6
0
0
0
0
0.00%
0
0
0
0
0.00%
2
0
0
0
0
0.00%
0
0
0
0
0.00%
6
0
0
0
0
0.00%
0
0
0
0
0.00%
10
0
0
0
0
0.00%
0
0
0
0
0.00%
20
0
0
0
0
0.00%
0
0
0
0
0.00%
60
0
0
0
0
0.00%
0
0
0
0
0.00%
100
0
0
0
0
0.00%
0
0
0
0
0.00%
200
0
0
0
0
0.00%
0
0
0
0
0.00%
600
0
0
0
0
0.00%
0
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 19 of 30
December 2016

-------
B.5- CL with OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
All Systems
0.6
8
4
1
7
50.83%
331,910
184,205
67,243
291,279
55.50%
2
8
2
1
3
19.72%
331,910
78,871
51,341
158,458
23.76%
6
8
0
0
1
5.76%
331,910
24,317
6,544
47,746
7.33%
10
8
0
0
0
1.90%
331,910
8,083
1,026
20,796
2.44%
20
8
0
0
0
0.24%
331,910
1,019
43
3,252
0.31%
60
8
0
0
0
0.00%
331,910
14
0
41
0.00%
100
8
0
0
0
0.00%
331,910
1
0
3
0.00%
200
8
0
0
0
0.00%
331,910
0
0
0
0.00%
600
8
0
0
0
0.00%
331,910
0
0
0
0.00%
Surface Water
Systems
0.6
1
1
0
1
60.97%
77,280
47,117
503
77,267
60.97%
2
1
0
0
1
13.35%
77,280
10,318
1
47,493
13.35%
6
1
0
0
0
0.59%
77,280
458
0
2,931
0.59%
10
1
0
0
0
0.07%
77,280
58
0
423
0.07%
20
1
0
0
0
0.00%
77,280
2
0
12
0.00%
60
1
0
0
0
0.00%
77,280
0
0
0
0.00%
100
1
0
0
0
0.00%
77,280
0
0
0
0.00%
200
1
0
0
0
0.00%
77,280
0
0
0
0.00%
600
1
0
0
0
0.00%
77,280
0
0
0
0.00%
Ground Water
Systems
0.6
5
2
1
4
49.15%
155,528
87,830
61,044
119,920
56.47%
2
5
1
1
2
24.77%
155,528
58,448
51,307
73,665
37.58%
6
5
0
0
1
8.85%
155,528
23,259
6,544
41,846
14.95%
10
5
0
0
0
2.99%
155,528
7,929
1,026
19,967
5.10%
20
5
0
0
0
0.38%
155,528
1,012
43
3,224
0.65%
60
5
0
0
0
0.01%
155,528
14
0
41
0.01%
100
5
0
0
0
0.00%
155,528
1
0
3
0.00%
200
5
0
0
0
0.00%
155,528
0
0
0
0.00%
600
5
0
0
0
0.00%
155,528
0
0
0
0.00%
Mixed Water
Systems
0.6
2
1
0
2
49.93%
99,102
49,258
5,696
94,092
49.70%
2
2
0
0
1
10.26%
99,102
10,105
34
37,300
10.20%
6
2
0
0
0
0.60%
99,102
600
0
2,969
0.61%
10
2
0
0
0
0.10%
99,102
96
0
405
0.10%
20
2
0
0
0
0.00%
99,102
5
0
16
0.00%
60
2
0
0
0
0.00%
99,102
0
0
0
0.00%
100
2
0
0
0
0.00%
99,102
0
0
0
0.00%
200
2
0
0
0
0.00%
99,102
0
0
0
0.00%
600
2
0
0
0
0.00%
99,102
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 20 of 30
December 2016

-------
B.5- CL with OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All Systems
0.6
13
7
4
10
53.70%
9,134,128
5,660,659
890,102
8,629,977
61.97%
2
13
3
1
5
19.60%
9,134,128
1,386,774
234,676
5,146,135
15.18%
6
13
1
0
1
6.00%
9,134,128
164,187
59,779
391,627
1.80%
10
13
0
0
1
2.17%
9,134,128
49,566
12,852
118,941
0.54%
20
13
0
0
0
0.27%
9,134,128
5,648
691
18,578
0.06%
60
13
0
0
0
0.00%
9,134,128
63
1
265
0.00%
100
13
0
0
0
0.00%
9,134,128
5
0
21
0.00%
200
13
0
0
0
0.00%
9,134,128
0
0
0
0.00%
600
13
0
0
0
0.00%
9,134,128
0
0
0
0.00%
Surface Water
Systems
0.6
6
4
2
5
60.38%
7,668,042
4,911,768
661,506
7,399,719
64.06%
2
6
1
0
2
19.06%
7,668,042
1,124,048
77,296
4,572,211
14.66%
6
6
0
0
0
1.62%
7,668,042
55,537
1,012
223,437
0.72%
10
6
0
0
0
0.29%
7,668,042
7,911
70
25,662
0.10%
20
6
0
0
0
0.02%
7,668,042
338
1
1,189
0.00%
60
6
0
0
0
0.00%
7,668,042
1
0
2
0.00%
100
6
0
0
0
0.00%
7,668,042
0
0
0
0.00%
200
6
0
0
0
0.00%
7,668,042
0
0
0
0.00%
600
6
0
0
0
0.00%
7,668,042
0
0
0
0.00%
Ground Water
Systems
0.6
4
2
0
3
39.25%
1,151,288
532,310
69,889
936,138
46.24%
2
4
0
0
1
7.04%
1,151,288
96,974
910
372,704
8.42%
6
4
0
0
0
0.37%
1,151,288
4,662
2
23,243
0.40%
10
4
0
0
0
0.06%
1,151,288
708
0
3,371
0.06%
20
4
0
0
0
0.00%
1,151,288
35
0
184
0.00%
60
4
0
0
0
0.00%
1,151,288
0
0
0
0.00%
100
4
0
0
0
0.00%
1,151,288
0
0
0
0.00%
200
4
0
0
0
0.00%
1,151,288
0
0
0
0.00%
600
4
0
0
0
0.00%
1,151,288
0
0
0
0.00%
Mixed Water
Systems
0.6
3
2
1
3
59.60%
314,798
216,582
158,706
294,120
68.80%
2
3
1
1
2
37.45%
314,798
165,752
156,469
201,220
52.65%
6
3
1
0
1
22.25%
314,798
103,989
58,765
144,947
33.03%
10
3
0
0
1
8.74%
314,798
40,947
12,781
89,908
13.01%
20
3
0
0
0
1.12%
314,798
5,276
690
17,206
1.68%
60
3
0
0
0
0.01%
314,798
62
1
262
0.02%
100
3
0
0
0
0.00%
314,798
5
0
21
0.00%
200
3
0
0
0
0.00%
314,798
0
0
0
0.00%
600
3
0
0
0
0.00%
314,798
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 21 of 30
December 2016

-------
B.5- CL with OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All Systems
0.6
22
11
5
18
52.24%
9,475,038
5,848,890
957,357
8,930,226
61.73%
2
22
4
2
8
19.15%
9,475,038
1,466,420
286,017
5,309,047
15.48%
6
22
1
1
2
5.66%
9,475,038
188,539
66,323
439,568
1.99%
10
22
0
0
1
1.97%
9,475,038
57,653
13,877
139,756
0.61%
20
22
0
0
0
0.24%
9,475,038
6,668
734
21,830
0.07%
60
22
0
0
0
0.00%
9,475,038
77
1
305
0.00%
100
22
0
0
0
0.00%
9,475,038
7
0
24
0.00%
200
22
0
0
0
0.00%
9,475,038
0
0
0
0.00%
600
22
0
0
0
0.00%
9,475,038
0
0
0
0.00%
Surface Water
Systems
0.6
8
5
2
7
58.50%
7,754,323
4,962,911
662,021
7,485,956
64.00%
2
8
1
0
3
17.04%
7,754,323
1,135,141
77,296
4,624,159
14.64%
6
8
0
0
0
1.34%
7,754,323
56,030
1,012
226,563
0.72%
10
8
0
0
0
0.23%
7,754,323
7,974
70
26,105
0.10%
20
8
0
0
0
0.01%
7,754,323
340
1
1,202
0.00%
60
8
0
0
0
0.00%
7,754,323
1
0
2
0.00%
100
8
0
0
0
0.00%
7,754,323
0
0
0
0.00%
200
8
0
0
0
0.00%
7,754,323
0
0
0
0.00%
600
8
0
0
0
0.00%
7,754,323
0
0
0
0.00%
Ground Water
Systems
0.6
9
4
2
6
44.75%
1,306,816
620,139
130,933
1,056,058
47.45%
2
9
2
1
3
16.89%
1,306,816
155,421
52,217
446,369
11.89%
6
9
0
0
1
5.08%
1,306,816
27,921
6,546
65,089
2.14%
10
9
0
0
0
1.69%
1,306,816
8,637
1,026
23,338
0.66%
20
9
0
0
0
0.21%
1,306,816
1,047
43
3,407
0.08%
60
9
0
0
0
0.00%
1,306,816
14
0
41
0.00%
100
9
0
0
0
0.00%
1,306,816
1
0
3
0.00%
200
9
0
0
0
0.00%
1,306,816
0
0
0
0.00%
600
9
0
0
0
0.00%
1,306,816
0
0
0
0.00%
Mixed Water
Systems
0.6
5
3
1
5
55.73%
413,900
265,840
164,402
388,211
64.23%
2
5
1
1
2
26.57%
413,900
175,858
156,503
238,520
42.49%
6
5
1
0
1
13.59%
413,900
104,589
58,765
147,916
25.27%
10
5
0
0
1
5.28%
413,900
41,042
12,781
90,313
9.92%
20
5
0
0
0
0.68%
413,900
5,280
690
17,221
1.28%
60
5
0
0
0
0.01%
413,900
63
1
262
0.02%
100
5
0
0
0
0.00%
413,900
5
0
21
0.00%
200
5
0
0
0
0.00%
413,900
0
0
0
0.00%
600
5
0
0
0
0.00%
413,900
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 22 of 30
December 2016

-------
B.6 - OT Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
1
1
0
1
72.44%
40
29
3
40
72.44%
2
1
0
0
1
20.55%
40
8
0
30
20.55%
6
1
0
0
0
1.29%
40
1
0
3
1.29%
10
1
0
0
0
0.20%
40
0
0
0
0.20%
20
1
0
0
0
0.01%
40
0
0
0
0.01%
60
1
0
0
0
0.00%
40
0
0
0
0.00%
100
1
0
0
0
0.00%
40
0
0
0
0.00%
200
1
0
0
0
0.00%
40
0
0
0
0.00%
600
1
0
0
0
0.00%
40
0
0
0
0.00%
Surface Water
Systems
0.6
1
1
0
1
72.44%
40
29
3
40
72.44%
2
1
0
0
1
20.55%
40
8
0
30
20.55%
6
1
0
0
0
1.29%
40
1
0
3
1.29%
10
1
0
0
0
0.20%
40
0
0
0
0.20%
20
1
0
0
0
0.01%
40
0
0
0
0.01%
60
1
0
0
0
0.00%
40
0
0
0
0.00%
100
1
0
0
0
0.00%
40
0
0
0
0.00%
200
1
0
0
0
0.00%
40
0
0
0
0.00%
600
1
0
0
0
0.00%
40
0
0
0
0.00%
Ground Water
Systems
0.6
0
0
0
0
0.00%
0
0
0
0
0.00%
2
0
0
0
0
0.00%
0
0
0
0
0.00%
6
0
0
0
0
0.00%
0
0
0
0
0.00%
10
0
0
0
0
0.00%
0
0
0
0
0.00%
20
0
0
0
0
0.00%
0
0
0
0
0.00%
60
0
0
0
0
0.00%
0
0
0
0
0.00%
100
0
0
0
0
0.00%
0
0
0
0
0.00%
200
0
0
0
0
0.00%
0
0
0
0
0.00%
600
0
0
0
0
0.00%
0
0
0
0
0.00%
Mixed Water
Systems
0.6
0
0
0
0
0.00%
0
0
0
0
0.00%
2
0
0
0
0
0.00%
0
0
0
0
0.00%
6
0
0
0
0
0.00%
0
0
0
0
0.00%
10
0
0
0
0
0.00%
0
0
0
0
0.00%
20
0
0
0
0
0.00%
0
0
0
0
0.00%
60
0
0
0
0
0.00%
0
0
0
0
0.00%
100
0
0
0
0
0.00%
0
0
0
0
0.00%
200
0
0
0
0
0.00%
0
0
0
0
0.00%
600
0
0
0
0
0.00%
0
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 23 of 30
December 2016

-------
B.6 - OT Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
All Systems
0.6
5
3
2
4
61.28%
225,056
101,083
39,332
171,732
44.91%
2
5
2
1
3
38.45%
225,056
42,841
24,423
84,726
19.04%
6
5
1
1
2
22.82%
225,056
24,144
21,821
32,074
10.73%
10
5
1
1
1
19.97%
225,056
21,576
19,283
23,732
9.59%
20
5
1
0
1
13.36%
225,056
14,546
7,026
20,895
6.46%
60
5
0
0
0
1.39%
225,056
1,515
148
5,184
0.67%
100
5
0
0
0
0.24%
225,056
260
11
1,081
0.12%
200
5
0
0
0
0.01%
225,056
13
0
60
0.01%
600
5
0
0
0
0.00%
225,056
0
0
0
0.00%
Surface Water
Systems
0.6
2
2
2
2
99.72%
32,305
32,247
32,041
32,305
99.82%
2
2
2
1
2
85.59%
32,305
29,279
24,372
32,183
90.63%
6
2
1
1
1
56.25%
32,305
23,096
21,821
26,240
71.49%
10
2
1
1
1
49.77%
32,305
21,373
19,283
22,636
66.16%
20
2
1
0
1
33.38%
32,305
14,533
7,026
20,835
44.99%
60
2
0
0
0
3.47%
32,305
1,515
148
5,184
4.69%
100
2
0
0
0
0.60%
32,305
260
11
1,081
0.81%
200
2
0
0
0
0.03%
32,305
13
0
60
0.04%
600
2
0
0
0
0.00%
32,305
0
0
0
0.00%
Ground Water
Systems
0.6
3
1
0
2
35.66%
192,751
68,836
7,291
139,427
35.71%
2
3
0
0
1
7.03%
192,751
13,562
51
52,544
7.04%
6
3
0
0
0
0.54%
192,751
1,048
0
5,833
0.54%
10
3
0
0
0
0.11%
192,751
203
0
1,096
0.11%
20
3
0
0
0
0.01%
192,751
13
0
59
0.01%
60
3
0
0
0
0.00%
192,751
0
0
0
0.00%
100
3
0
0
0
0.00%
192,751
0
0
0
0.00%
200
3
0
0
0
0.00%
192,751
0
0
0
0.00%
600
3
0
0
0
0.00%
192,751
0
0
0
0.00%
Mixed Water
Systems
0.6
0
0
0
0
0.00%
0
0
0
0
0.00%
2
0
0
0
0
0.00%
0
0
0
0
0.00%
6
0
0
0
0
0.00%
0
0
0
0
0.00%
10
0
0
0
0
0.00%
0
0
0
0
0.00%
20
0
0
0
0
0.00%
0
0
0
0
0.00%
60
0
0
0
0
0.00%
0
0
0
0
0.00%
100
0
0
0
0
0.00%
0
0
0
0
0.00%
200
0
0
0
0
0.00%
0
0
0
0
0.00%
600
0
0
0
0
0.00%
0
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 24 of 30
December 2016

-------
B.6 - OT Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All Systems
0.6
3
2
1
3
70.75%
701,961
469,185
110,994
700,936
66.84%
2
3
1
0
2
33.88%
701,961
163,827
36,618
476,255
23.34%
6
3
0
0
0
5.10%
701,961
19,184
938
66,511
2.73%
10
3
0
0
0
1.11%
701,961
3,979
81
15,471
0.57%
20
3
0
0
0
0.07%
701,961
257
1
992
0.04%
60
3
0
0
0
0.00%
701,961
1
0
2
0.00%
100
3
0
0
0
0.00%
701,961
0
0
0
0.00%
200
3
0
0
0
0.00%
701,961
0
0
0
0.00%
600
3
0
0
0
0.00%
701,961
0
0
0
0.00%
Surface Water
Systems
0.6
1
1
0
1
66.49%
445,327
296,110
9,470
445,194
66.49%
2
1
0
0
1
15.94%
445,327
70,996
21
293,884
15.94%
6
1
0
0
0
0.92%
445,327
4,098
0
19,821
0.92%
10
1
0
0
0
0.14%
445,327
618
0
2,600
0.14%
20
1
0
0
0
0.01%
445,327
27
0
92
0.01%
60
1
0
0
0
0.00%
445,327
0
0
0
0.00%
100
1
0
0
0
0.00%
445,327
0
0
0
0.00%
200
1
0
0
0
0.00%
445,327
0
0
0
0.00%
600
1
0
0
0
0.00%
445,327
0
0
0
0.00%
Ground Water
Systems
0.6
1
0
0
1
45.99%
154,288
70,965
179
153,397
45.99%
2
1
0
0
1
9.86%
154,288
15,206
0
81,580
9.86%
6
1
0
0
0
0.72%
154,288
1,116
0
5,619
0.72%
10
1
0
0
0
0.16%
154,288
241
0
883
0.16%
20
1
0
0
0
0.01%
154,288
23
0
32
0.01%
60
1
0
0
0
0.00%
154,288
0
0
0
0.00%
100
1
0
0
0
0.00%
154,288
0
0
0
0.00%
200
1
0
0
0
0.00%
154,288
0
0
0
0.00%
600
1
0
0
0
0.00%
154,288
0
0
0
0.00%
Mixed Water
Systems
0.6
1
1
1
1
99.77%
102,346
102,111
101,345
102,346
99.77%
2
1
1
0
1
75.85%
102,346
77,625
36,597
100,791
75.85%
6
1
0
0
0
13.65%
102,346
13,970
938
41,070
13.65%
10
1
0
0
0
3.05%
102,346
3,120
81
11,988
3.05%
20
1
0
0
0
0.20%
102,346
207
1
868
0.20%
60
1
0
0
0
0.00%
102,346
1
0
2
0.00%
100
1
0
0
0
0.00%
102,346
0
0
0
0.00%
200
1
0
0
0
0.00%
102,346
0
0
0
0.00%
600
1
0
0
0
0.00%
102,346
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 25 of 30
December 2016

-------
B.6 - OT Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All Systems
0.6
9
6
3
8
65.68%
927,057
570,297
150,330
872,708
61.52%
2
9
3
2
6
34.94%
927,057
206,677
61,040
561,012
22.29%
6
9
1
1
2
14.52%
927,057
43,329
22,760
98,587
4.67%
10
9
1
1
1
11.49%
927,057
25,555
19,364
39,204
2.76%
20
9
1
0
1
7.45%
927,057
14,803
7,028
21,887
1.60%
60
9
0
0
0
0.77%
927,057
1,516
148
5,187
0.16%
100
9
0
0
0
0.13%
927,057
260
11
1,081
0.03%
200
9
0
0
0
0.01%
927,057
13
0
60
0.00%
600
9
0
0
0
0.00%
927,057
0
0
0
0.00%
Surface Water
Systems
0.6
4
3
2
4
84.59%
477,672
328,385
41,515
477,539
68.75%
2
4
2
1
3
51.92%
477,672
100,283
24,392
326,097
20.99%
6
4
1
1
2
28.68%
477,672
27,194
21,821
46,064
5.69%
10
4
1
1
1
24.97%
477,672
21,991
19,283
25,236
4.60%
20
4
1
0
1
16.69%
477,672
14,560
7,026
20,928
3.05%
60
4
0
0
0
1.74%
477,672
1,515
148
5,184
0.32%
100
4
0
0
0
0.30%
477,672
260
11
1,081
0.05%
200
4
0
0
0
0.01%
477,672
13
0
60
0.00%
600
4
0
0
0
0.00%
477,672
0
0
0
0.00%
Ground Water
Systems
0.6
4
2
0
3
38.24%
347,039
139,801
7,470
292,824
40.28%
2
4
0
0
1
7.73%
347,039
28,768
51
134,124
8.29%
6
4
0
0
0
0.59%
347,039
2,165
0
11,452
0.62%
10
4
0
0
0
0.12%
347,039
444
0
1,979
0.13%
20
4
0
0
0
0.01%
347,039
36
0
91
0.01%
60
4
0
0
0
0.00%
347,039
0
0
0
0.00%
100
4
0
0
0
0.00%
347,039
0
0
0
0.00%
200
4
0
0
0
0.00%
347,039
0
0
0
0.00%
600
4
0
0
0
0.00%
347,039
0
0
0
0.00%
Mixed Water
Systems
0.6
1
1
1
1
99.77%
102,346
102,111
101,345
102,346
99.77%
2
1
1
0
1
75.85%
102,346
77,625
36,597
100,791
75.85%
6
1
0
0
0
13.65%
102,346
13,970
938
41,070
13.65%
10
1
0
0
0
3.05%
102,346
3,120
81
11,988
3.05%
20
1
0
0
0
0.20%
102,346
207
1
868
0.20%
60
1
0
0
0
0.00%
102,346
1
0
2
0.00%
100
1
0
0
0
0.00%
102,346
0
0
0
0.00%
200
1
0
0
0
0.00%
102,346
0
0
0
0.00%
600
1
0
0
0
0.00%
102,346
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 26 of 30
December 2016

-------
B.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to have
Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
55
9
4
14
15.74%
42,570
13,217
9,144
18,517
31.05%
2
55
2
1
4
4.21%
42,570
6,073
1,764
9,706
14.27%
6
55
0
0
1
0.57%
42,570
1,081
69
3,578
2.54%
10
55
0
0
0
0.16%
42,570
305
11
1,172
0.72%
20
55
0
0
0
0.02%
42,570
34
0
158
0.08%
60
55
0
0
0
0.00%
42,570
0
0
1
0.00%
100
55
0
0
0
0.00%
42,570
0
0
0
0.00%
200
55
0
0
0
0.00%
42,570
0
0
0
0.00%
600
55
0
0
0
0.00%
42,570
0
0
0
0.00%
Surface Water
Systems
0.6
4
2
1
4
54.77%
895
487
135
817
54.45%
2
4
0
0
1
11.98%
895
108
3
335
12.04%
6
4
0
0
0
0.67%
895
6
0
26
0.71%
10
4
0
0
0
0.10%
895
1
0
4
0.11%
20
4
0
0
0
0.00%
895
0
0
0
0.01%
60
4
0
0
0
0.00%
895
0
0
0
0.00%
100
4
0
0
0
0.00%
895
0
0
0
0.00%
200
4
0
0
0
0.00%
895
0
0
0
0.00%
600
4
0
0
0
0.00%
895
0
0
0
0.00%
Ground Water
Systems
0.6
51
6
4
10
12.68%
41,675
12,730
9,009
17,700
30.55%
2
51
2
1
3
3.60%
41,675
5,966
1,761
9,371
14.31%
6
51
0
0
1
0.56%
41,675
1,075
69
3,552
2.58%
10
51
0
0
0
0.16%
41,675
304
11
1,168
0.73%
20
51
0
0
0
0.02%
41,675
33
0
158
0.08%
60
51
0
0
0
0.00%
41,675
0
0
1
0.00%
100
51
0
0
0
0.00%
41,675
0
0
0
0.00%
200
51
0
0
0
0.00%
41,675
0
0
0
0.00%
600
51
0
0
0
0.00%
41,675
0
0
0
0.00%
Mixed Water
Systems
0.6
0
0
0
0
0.00%
0
0
0
0
0.00%
2
0
0
0
0
0.00%
0
0
0
0
0.00%
6
0
0
0
0
0.00%
0
0
0
0
0.00%
10
0
0
0
0
0.00%
0
0
0
0
0.00%
20
0
0
0
0
0.00%
0
0
0
0
0.00%
60
0
0
0
0
0.00%
0
0
0
0
0.00%
100
0
0
0
0
0.00%
0
0
0
0
0.00%
200
0
0
0
0
0.00%
0
0
0
0
0.00%
600
0
0
0
0
0.00%
0
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 27 of 30
December 2016

-------
B.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to have
Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
All Systems
0.6
3
1
0
2
19.66%
167,731
30,095
279
92,488
17.94%
2
3
0
0
0
2.75%
167,731
4,101
1
22,796
2.45%
6
3
0
0
0
0.12%
167,731
166
0
831
0.10%
10
3
0
0
0
0.02%
167,731
23
0
89
0.01%
20
3
0
0
0
0.00%
167,731
1
0
2
0.00%
60
3
0
0
0
0.00%
167,731
0
0
0
0.00%
100
3
0
0
0
0.00%
167,731
0
0
0
0.00%
200
3
0
0
0
0.00%
167,731
0
0
0
0.00%
600
3
0
0
0
0.00%
167,731
0
0
0
0.00%
Surface Water
Systems
0.6
0
0
0
0
0.00%
0
0
0
0
0.00%
2
0
0
0
0
0.00%
0
0
0
0
0.00%
6
0
0
0
0
0.00%
0
0
0
0
0.00%
10
0
0
0
0
0.00%
0
0
0
0
0.00%
20
0
0
0
0
0.00%
0
0
0
0
0.00%
60
0
0
0
0
0.00%
0
0
0
0
0.00%
100
0
0
0
0
0.00%
0
0
0
0
0.00%
200
0
0
0
0
0.00%
0
0
0
0
0.00%
600
0
0
0
0
0.00%
0
0
0
0
0.00%
Ground Water
Systems
0.6
3
1
0
2
19.66%
167,731
30,095
279
92,488
17.94%
2
3
0
0
0
2.75%
167,731
4,101
1
22,796
2.45%
6
3
0
0
0
0.12%
167,731
166
0
831
0.10%
10
3
0
0
0
0.02%
167,731
23
0
89
0.01%
20
3
0
0
0
0.00%
167,731
1
0
2
0.00%
60
3
0
0
0
0.00%
167,731
0
0
0
0.00%
100
3
0
0
0
0.00%
167,731
0
0
0
0.00%
200
3
0
0
0
0.00%
167,731
0
0
0
0.00%
600
3
0
0
0
0.00%
167,731
0
0
0
0.00%
Mixed Water
Systems
0.6
0
0
0
0
0.00%
0
0
0
0
0.00%
2
0
0
0
0
0.00%
0
0
0
0
0.00%
6
0
0
0
0
0.00%
0
0
0
0
0.00%
10
0
0
0
0
0.00%
0
0
0
0
0.00%
20
0
0
0
0
0.00%
0
0
0
0
0.00%
60
0
0
0
0
0.00%
0
0
0
0
0.00%
100
0
0
0
0
0.00%
0
0
0
0
0.00%
200
0
0
0
0
0.00%
0
0
0
0
0.00%
600
0
0
0
0
0.00%
0
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 28 of 30
December 2016

-------
B.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to have
Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All Systems
0.6
1
0
0
1
13.24%
107,323
14,213
0
86,325
13.24%
2
1
0
0
0
1.90%
107,323
2,037
0
12,314
1.90%
6
1
0
0
0
0.08%
107,323
89
0
273
0.08%
10
1
0
0
0
0.01%
107,323
12
0
22
0.01%
20
1
0
0
0
0.00%
107,323
0
0
0
0.00%
60
1
0
0
0
0.00%
107,323
0
0
0
0.00%
100
1
0
0
0
0.00%
107,323
0
0
0
0.00%
200
1
0
0
0
0.00%
107,323
0
0
0
0.00%
600
1
0
0
0
0.00%
107,323
0
0
0
0.00%
Surface Water
Systems
0.6
0
0
0
0
0.00%
0
0
0
0
0.00%
2
0
0
0
0
0.00%
0
0
0
0
0.00%
6
0
0
0
0
0.00%
0
0
0
0
0.00%
10
0
0
0
0
0.00%
0
0
0
0
0.00%
20
0
0
0
0
0.00%
0
0
0
0
0.00%
60
0
0
0
0
0.00%
0
0
0
0
0.00%
100
0
0
0
0
0.00%
0
0
0
0
0.00%
200
0
0
0
0
0.00%
0
0
0
0
0.00%
600
0
0
0
0
0.00%
0
0
0
0
0.00%
Ground Water
Systems
0.6
1
0
0
1
13.24%
107,323
14,213
0
86,325
13.24%
2
1
0
0
0
1.90%
107,323
2,037
0
12,314
1.90%
6
1
0
0
0
0.08%
107,323
89
0
273
0.08%
10
1
0
0
0
0.01%
107,323
12
0
22
0.01%
20
1
0
0
0
0.00%
107,323
0
0
0
0.00%
60
1
0
0
0
0.00%
107,323
0
0
0
0.00%
100
1
0
0
0
0.00%
107,323
0
0
0
0.00%
200
1
0
0
0
0.00%
107,323
0
0
0
0.00%
600
1
0
0
0
0.00%
107,323
0
0
0
0.00%
Mixed Water
Systems
0.6
0
0
0
0
0.00%
0
0
0
0
0.00%
2
0
0
0
0
0.00%
0
0
0
0
0.00%
6
0
0
0
0
0.00%
0
0
0
0
0.00%
10
0
0
0
0
0.00%
0
0
0
0
0.00%
20
0
0
0
0
0.00%
0
0
0
0
0.00%
60
0
0
0
0
0.00%
0
0
0
0
0.00%
100
0
0
0
0
0.00%
0
0
0
0
0.00%
200
0
0
0
0
0.00%
0
0
0
0
0.00%
600
0
0
0
0
0.00%
0
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 29 of 30
December 2016

-------
B.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
Total Number of
UCMR 2 Systems
Predicted to have
Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
UCMR 2
Systems with
Any Detects
Exceeding
Threshold
Total Population
Served by UCMR
2 Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by UCMR 2
Systems with Any
Detects Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All Systems
0.6
59
9
4
16
15.90%
317,624
57,525
9,423
197,330
18.11%
2
59
2
1
5
4.10%
317,624
12,212
1,764
44,816
3.84%
6
59
0
0
1
0.54%
317,624
1,337
69
4,681
0.42%
10
59
0
0
0
0.15%
317,624
340
11
1,283
0.11%
20
59
0
0
0
0.02%
317,624
35
0
160
0.01%
60
59
0
0
0
0.00%
317,624
0
0
1
0.00%
100
59
0
0
0
0.00%
317,624
0
0
0
0.00%
200
59
0
0
0
0.00%
317,624
0
0
0
0.00%
600
59
0
0
0
0.00%
317,624
0
0
0
0.00%
Surface Water
Systems
0.6
4
2
1
4
54.77%
895
487
135
817
54.45%
2
4
0
0
1
11.98%
895
108
3
335
12.04%
6
4
0
0
0
0.67%
895
6
0
26
0.71%
10
4
0
0
0
0.10%
895
1
0
4
0.11%
20
4
0
0
0
0.00%
895
0
0
0
0.01%
60
4
0
0
0
0.00%
895
0
0
0
0.00%
100
4
0
0
0
0.00%
895
0
0
0
0.00%
200
4
0
0
0
0.00%
895
0
0
0
0.00%
600
4
0
0
0
0.00%
895
0
0
0
0.00%
Ground Water
Systems
0.6
55
7
4
13
13.07%
316,729
57,038
9,288
196,513
18.01%
2
55
2
1
4
3.53%
316,729
12,104
1,761
44,481
3.82%
6
55
0
0
1
0.53%
316,729
1,330
69
4,655
0.42%
10
55
0
0
0
0.15%
316,729
339
11
1,279
0.11%
20
55
0
0
0
0.02%
316,729
35
0
160
0.01%
60
55
0
0
0
0.00%
316,729
0
0
1
0.00%
100
55
0
0
0
0.00%
316,729
0
0
0
0.00%
200
55
0
0
0
0.00%
316,729
0
0
0
0.00%
600
55
0
0
0
0.00%
316,729
0
0
0
0.00%
Mixed Water
Systems
0.6
0
0
0
0
0.00%
0
0
0
0
0.00%
2
0
0
0
0
0.00%
0
0
0
0
0.00%
6
0
0
0
0
0.00%
0
0
0
0
0.00%
10
0
0
0
0
0.00%
0
0
0
0
0.00%
20
0
0
0
0
0.00%
0
0
0
0
0.00%
60
0
0
0
0
0.00%
0
0
0
0
0.00%
100
0
0
0
0
0.00%
0
0
0
0
0.00%
200
0
0
0
0
0.00%
0
0
0
0
0.00%
600
0
0
0
0
0.00%
0
0
0
0
0.00%
Appendix B
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 30 of 30
December 2016

-------
Appendix C
National Extrapolation of Facilities
and Population Served Predicted
To Have Detections Exceeding
Thresholds
Appendix C
Six-Year Review 3
Technical Support Document for Nitrosamines Page 1 of 114
December 2016

-------
The UCMR 2 data set for nitrosamines includes data for 1,198 systems, 4,666 entry point
locations and 2,397 maximum residence time locations. A model was developed to generate
estimates of NDMA occurrence. The purpose of the model was to estimate the mean
concentration of NDMA in the drinking water of each water system in UCMR, heterogeneity
across systems in their means, variability around those means and uncertainty in those
estimates. To produce the results in this appendix, the statistical model was used to simulate
the probability of a detection being greater than the HRL, and other thresholds, at each facility
given that facility's parameter values of mean and variability. Appendix C provides a national
extrapolation of facility level counts, which are broken down by source water type. Tables are
first presented for all disinfectants, and then for chlorine (CL Only), chloramines (CA Only),
chloramines with other types of disinfectants (CA with CL-OT), chlorine with other types of
disinfectants (CL with OT), other types of disinfectants (OT Only) and no disinfectant (ND Only).
Appendix C
Six-Year Review 3
Technical Support Document for Nitrosamines Page 2 of 114
December 2016

-------
C.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPs
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted to
have Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All EPs Only
0.6
677
41,962
1.664
69,831
152
118
192
11.05%
7.01%
16.08%
7,715
4,898
11,232
2
677
41,962
1.664
69,831
69
56
85
3.96%
2.71%
5.64%
2,769
1,894
3,940
6
677
41,962
1.664
69,831
31
25
38
1.51%
1.09%
2.10%
1,054
759
1,469
10
677
41,962
1.664
69,831
21
17
26
0.96%
0.70%
1.33%
672
488
932
20
677
41,962
1.664
69,831
12
9
15
0.48%
0.31%
0.69%
335
219
482
60
677
41,962
1.664
69,831
3
2
6
0.10%
0.03%
0.19%
69
24
134
100
677
41,962
1.664
69,831
2
0
3
0.04%
0.01%
0.09%
26
5
62
200
677
41,962
1.664
69,831
0
0
1
0.01%
0.00%
0.02%
5
0
16
600
677
41,962
1.664
69,831
0
0
0
0.00%
0.00%
0.00%
0
0
1
EPs Only at Surface
Water Systems
0.6
232
1,986
1.045
2,075
96
81
112
41.28%
34.91%
48.30%
857
724
1,002
2
232
1,986
1.045
2,075
46
40
53
19.72%
17.20%
22.72%
409
357
471
6
232
1,986
1.045
2,075
21
18
24
9.05%
7.75%
10.49%
188
161
218
10
232
1,986
1.045
2,075
14
12
17
6.23%
5.23%
7.33%
129
108
152
20
232
1,986
1.045
2,075
9
7
10
3.69%
2.92%
4.49%
77
61
93
60
232
1,986
1.045
2,075
3
2
4
1.27%
0.69%
1.89%
26
14
39
100
232
1,986
1.045
2,075
1
0
3
0.62%
0.20%
1.13%
13
4
23
200
232
1,986
1.045
2,075
0
0
1
0.16%
0.02%
0.43%
3
0
9
600
232
1,986
1.045
2,075
0
0
0
0.01%
0.00%
0.02%
0
0
0
EPs Only at Ground
Water Systems
0.6
399
38,525
1.663
64,048
29
15
47
7.19%
3.64%
11.81%
4,602
2,330
7,562
2
399
38,525
1.663
64,048
6
3
11
1.53%
0.65%
2.82%
982
417
1,805
6
399
38,525
1.663
64,048
1
0
2
0.22%
0.04%
0.55%
139
24
354
10
399
38,525
1.663
64,048
0
0
1
0.07%
0.01%
0.22%
43
4
141
20
399
38,525
1.663
64,048
0
0
0
0.01%
0.00%
0.04%
6
0
26
60
399
38,525
1.663
64,048
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
399
38,525
1.663
64,048
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
399
38,525
1.663
64,048
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
399
38,525
1.663
64,048
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
46
1,451
2.556
3,708
28
23
33
60.84%
49.74%
71.94%
2,256
1,844
2,668
2
46
1,451
2.556
3,708
17
14
21
37.14%
30.20%
44.86%
1,377
1,120
1,663
6
46
1,451
2.556
3,708
9
7
11
19.60%
15.47%
24.20%
727
574
897
10
46
1,451
2.556
3,708
6
5
8
13.48%
10.14%
17.21%
500
376
638
20
46
1,451
2.556
3,708
3
2
4
6.80%
4.27%
9.77%
252
158
362
60
46
1,451
2.556
3,708
1
0
1
1.13%
0.25%
2.55%
42
9
94
100
46
1,451
2.556
3,708
0
0
0
0.34%
0.03%
1.04%
13
1
39
200
46
1,451
2.556
3,708
0
0
0
0.04%
0.00%
0.18%
2
0
7
600
46
1,451
2.556
3,708
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 3 of 114
December 2016

-------
C.l - All Disinfection Types
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by EPs
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
676,750
41,154,840
0.637
26,208,588
191,628
148,371
241,154
16.55%
10.77%
23.37%
4,336,679
2,822,774
6,123,715
676,750
41,154,840
0.637
26,208,588
98,438
79,432
121,874
6.78%
4.55%
9.88%
1,776,426
1,192,482
2,588,859
676,750
41,154,840
0.637
26,208,588
48,025
37,126
60,401
2.55%
1.70%
3.76%
668,103
445,135
986,056
676,750
41,154,840
0.637
26,208,588
32,540
24,683
42,255
1.56%
1.02%
2.31%
408,144
268,432
604,134
676,750
41,154,840
0.637
26,208,588
18,140
13,273
24,041
0.74%
0.47%
1.12%
194,595
122,764
293,735
676,750
41,154,840
0.637
26,208,588
5,821
3,323
8,902
0.17%
0.08%
0.30%
45,681
22,110
78,394
676,750
41,154,840
0.637
26,208,588
2,959
1,064
5,054
0.08%
0.03%
0.15%
20,705
6,620
39,426
676,750
41,154,840
0.637
26,208,588
844
114
2,159
0.02%
0.00%
0.05%
5,380
684
14,410
676,750
41,154,840
0.637
26,208,588
34
1
139
0.00%
0.00%
0.00%
204
4
840
288,792
5,030,810
0.505
2,539,891
132,460
110,386
157,637
41.51%
33.64%
50.40%
1,054,384
854,470
1,280,211
288,792
5,030,810
0.505
2,539,891
72,970
62,389
84,682
20.24%
16.88%
24.22%
514,130
428,767
615,076
288,792
5,030,810
0.505
2,539,891
37,993
30,483
45,592
9.56%
7.55%
11.59%
242,906
191,840
294,361
288,792
5,030,810
0.505
2,539,891
26,377
20,803
33,050
6.49%
5.00%
8.23%
164,744
126,924
209,104
288,792
5,030,810
0.505
2,539,891
15,384
11,761
19,536
3.67%
2.74%
4.74%
93,097
69,481
120,300
288,792
5,030,810
0.505
2,539,891
5,410
3,229
7,999
1.25%
0.75%
1.87%
31,779
18,940
47,451
288,792
5,030,810
0.505
2,539,891
2,836
1,051
4,693
0.66%
0.24%
1.08%
16,671
6,174
27,548
288,792
5,030,810
0.505
2,539,891
829
113
2,095
0.19%
0.03%
0.49%
4,883
667
12,353
288,792
5,030,810
0.505
2,539,891
34
1
138
0.01%
0.00%
0.03%
199
4
812
339,504
32,448,261
0.665
21,565,984
26,970
13,018
45,418
8.96%
4.23%
15.05%
1,931,433
912,418
3,245,427
339,504
32,448,261
0.665
21,565,984
6,314
2,245
12,218
2.23%
0.76%
4.42%
480,351
164,814
952,161
339,504
32,448,261
0.665
21,565,984
996
122
2,893
0.34%
0.04%
1.01%
74,174
8,948
217,953
339,504
32,448,261
0.665
21,565,984
321
17
1,217
0.11%
0.01%
0.39%
22,925
1,285
85,132
339,504
32,448,261
0.665
21,565,984
48
1
215
0.01%
0.00%
0.07%
3,205
51
14,067
339,504
32,448,261
0.665
21,565,984
1
0
4
0.00%
0.00%
0.00%
53
0
222
339,504
32,448,261
0.665
21,565,984
0
0
0
0.00%
0.00%
0.00%
5
0
18
339,504
32,448,261
0.665
21,565,984
0
0
0
0.00%
0.00%
0.00%
0
0
0
339,504
32,448,261
0.665
21,565,984
0
0
0
0.00%
0.00%
0.00%
0
0
0
48,454
3,675,769
0.572
2,102,713
32,197
24,966
38,099
64.24%
50.22%
76.00%
1,350,862
1,055,887
1,598,076
48,454
3,675,769
0.572
2,102,713
19,154
14,798
24,974
37.19%
28.48%
48.59%
781,945
598,902
1,021,622
48,454
3,675,769
0.572
2,102,713
9,036
6,521
11,916
16.69%
11.62%
22.53%
351,024
244,348
473,741
48,454
3,675,769
0.572
2,102,713
5,842
3,862
7,988
10.49%
6.67%
14.74%
220,475
140,223
309,899
48,454
3,675,769
0.572
2,102,713
2,708
1,511
4,291
4.67%
2.53%
7.58%
98,293
53,231
159,368
48,454
3,675,769
0.572
2,102,713
410
94
899
0.66%
0.15%
1.46%
13,850
3,170
30,721
48,454
3,675,769
0.572
2,102,713
123
13
361
0.19%
0.02%
0.56%
4,029
445
11,860
48,454
3,675,769
0.572
2,102,713
15
1
64
0.02%
0.00%
0.10%
497
17
2,057
48,454
3,675,769
0.572
2,102,713
0
0
1
0.00%
0.00%
0.00%
6
0
28
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 4 of 114
December 2016

-------
C.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number of
MRs with Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation



Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)

0.6
521
41,962
1.034
43,370
190
155
226
20.74%
13.84%
28.50%
8,995
6,001
12,362

2
521
41,962
1.034
43,370
85
72
101
6.42%
4.50%
8.96%
2,784
1,951
3,885

6
521
41,962
1.034
43,370
37
31
44
2.14%
1.52%
2.92%
929
659
1,268

10
521
41,962
1.034
43,370
25
21
30
1.31%
0.95%
1.79%
570
412
776
All MRs Only
20
521
41,962
1.034
43,370
15
12
18
0.66%
0.47%
0.92%
287
203
400

60
521
41,962
1.034
43,370
6
4
8
0.27%
0.19%
0.34%
118
82
149

100
521
41,962
1.034
43,370
3
1
5
0.18%
0.09%
0.26%
77
38
112

200
521
41,962
1.034
43,370
1
0
2
0.07%
0.02%
0.14%
29
7
60

600
521
41,962
1.034
43,370
0
0
0
0.00%
0.00%
0.02%
2
0
7

0.6
240
1,986
1.018
2,022
126
109
141
52.38%
45.37%
59.07%
1,059
917
1,194

2
240
1,986
1.018
2,022
59
53
67
23.19%
20.49%
26.74%
469
414
541

6
240
1,986
1.018
2,022
27
23
30
9.46%
8.27%
10.76%
191
167
218
MRs Only at
10
240
1,986
1.018
2,022
18
16
21
6.27%
5.29%
7.30%
127
107
148
Surface Water
20
240
1,986
1.018
2,022
11
9
13
3.68%
3.07%
4.40%
74
62
89
Systems
60
240
1,986
1.018
2,022
4
2
6
1.28%
0.70%
1.87%
26
14
38

100
240
1,986
1.018
2,022
2
1
3
0.55%
0.19%
1.04%
11
4
21

200
240
1,986
1.018
2,022
0
0
1
0.11%
0.02%
0.31%
2
0
6

600
240
1,986
1.018
2,022
0
0
0
0.00%
0.00%
0.01%
0
0
0

0.6
234
38,525
0.992
38,204
37
23
53
15.81%
9.23%
23.39%
6,039
3,525
8,935

2
234
38,525
0.992
38,204
7
4
12
2.92%
1.46%
4.98%
1,116
559
1,902

6
234
38,525
0.992
38,204
1
0
2
0.34%
0.08%
0.75%
130
30
287
MRs Only at
10
234
38,525
0.992
38,204
0
0
1
0.10%
0.01%
0.27%
38
4
102
Ground Water
20
234
38,525
0.992
38,204
0
0
0
0.01%
0.00%
0.05%
5
0
19
Systems
60
234
38,525
0.992
38,204
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
234
38,525
0.992
38,204
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
234
38,525
0.992
38,204
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
234
38,525
0.992
38,204
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
47
1,451
2.167
3,144
28
23
32
60.35%
49.56%
71.02%
1,897
1,558
2,233

2
47
1,451
2.167
3,144
18
15
21
38.13%
31.10%
45.89%
1,199
978
1,443

6
47
1,451
2.167
3,144
10
7
12
19.33%
14.69%
24.29%
608
462
764
MRs Only at
10
47
1,451
2.167
3,144
7
5
8
12.89%
9.55%
16.74%
405
300
526
Mixed Water
20
47
1,451
2.167
3,144
4
3
5
6.61%
4.47%
9.29%
208
141
292
Systems
60
47
1,451
2.167
3,144
2
1
2
2.92%
2.15%
3.52%
92
68
111

100
47
1,451
2.167
3,144
1
1
2
2.08%
1.09%
2.89%
65
34
91

200
47
1,451
2.167
3,144
1
0
1
0.84%
0.20%
1.71%
26
6
54

600
47
1,451
2.167
3,144
0
0
0
0.06%
0.00%
0.21%
2
0
7
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 5 of 114
December 2016

-------
C.l - All Disinfection Types
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
532,171
41,154,840
0.364
14,983,451
229,553
186,789
273,958
27.86%
19.70%
36.81%
4,174,292
2,951,922
5,515,912
532,171
41,154,840
0.364
14,983,451
113,493
95,998
137,455
10.96%
8.11%
15.07%
1,641,717
1,215,654
2,257,383
532,171
41,154,840
0.364
14,983,451
57,151
47,227
67,983
4.31%
3.15%
5.78%
646,311
472,236
866,240
532,171
41,154,840
0.364
14,983,451
40,135
32,257
49,736
2.75%
2.02%
3.74%
411,909
302,992
560,806
532,171
41,154,840
0.364
14,983,451
24,258
19,079
30,360
1.49%
1.10%
2.00%
223,943
165,070
300,319
532,171
41,154,840
0.364
14,983,451
8,894
5,964
12,230
0.60%
0.42%
0.77%
90,059
63,506
115,808
532,171
41,154,840
0.364
14,983,451
4,646
2,140
7,077
0.37%
0.18%
0.53%
54,870
27,167
79,537
532,171
41,154,840
0.364
14,983,451
1,355
261
3,122
0.13%
0.03%
0.28%
19,248
4,250
41,254
532,171
41,154,840
0.364
14,983,451
58
2
216
0.01%
0.00%
0.03%
1,095
39
4,063
284,899
5,030,810
0.497
2,502,576
169,075
147,476
191,248
55.66%
47.74%
63.90%
1,392,940
1,194,813
1,599,072
284,899
5,030,810
0.497
2,502,576
89,860
79,997
102,717
25.95%
22.58%
30.37%
649,412
565,049
760,043
284,899
5,030,810
0.497
2,502,576
48,024
41,190
54,805
12.05%
10.20%
13.95%
301,587
255,328
349,206
284,899
5,030,810
0.497
2,502,576
34,414
28,322
41,492
8.25%
6.69%
10.11%
206,451
167,338
252,944
284,899
5,030,810
0.497
2,502,576
21,239
16,976
26,083
4.88%
3.86%
6.06%
122,234
96,512
151,672
284,899
5,030,810
0.497
2,502,576
7,374
4,822
10,459
1.68%
1.10%
2.37%
42,000
27,579
59,340
284,899
5,030,810
0.497
2,502,576
3,550
1,563
5,564
0.82%
0.36%
1.27%
20,404
9,011
31,897
284,899
5,030,810
0.497
2,502,576
911
154
2,220
0.21%
0.04%
0.52%
5,291
892
12,910
284,899
5,030,810
0.497
2,502,576
28
1
106
0.01%
0.00%
0.02%
165
3
622
208,860
32,448,261
0.335
10,882,277
32,633
18,417
49,122
15.21%
8.36%
23.43%
1,654,660
909,752
2,550,024
208,860
32,448,261
0.335
10,882,277
6,705
2,958
12,201
2.94%
1.25%
5.56%
320,461
135,993
605,356
208,860
32,448,261
0.335
10,882,277
1,094
216
2,543
0.43%
0.09%
1.02%
47,076
9,292
111,522
208,860
32,448,261
0.335
10,882,277
384
32
1,153
0.15%
0.01%
0.44%
15,985
1,356
48,091
208,860
32,448,261
0.335
10,882,277
63
1
241
0.02%
0.00%
0.09%
2,544
50
9,818
208,860
32,448,261
0.335
10,882,277
1
0
5
0.00%
0.00%
0.00%
42
0
196
208,860
32,448,261
0.335
10,882,277
0
0
0
0.00%
0.00%
0.00%
4
0
15
208,860
32,448,261
0.335
10,882,277
0
0
0
0.00%
0.00%
0.00%
0
0
0
208,860
32,448,261
0.335
10,882,277
0
0
0
0.00%
0.00%
0.00%
0
0
0
38,412
3,675,769
0.435
1,598,599
27,845
20,896
33,587
70.48%
53.01%
85.50%
1,126,692
847,356
1,366,815
38,412
3,675,769
0.435
1,598,599
16,928
13,043
22,537
42.03%
32.19%
55.80%
671,844
514,612
891,984
38,412
3,675,769
0.435
1,598,599
8,034
5,821
10,634
18.62%
12.99%
25.37%
297,648
207,616
405,513
38,412
3,675,769
0.435
1,598,599
5,337
3,903
7,091
11.85%
8.40%
16.25%
189,473
134,298
259,771
38,412
3,675,769
0.435
1,598,599
2,957
2,102
4,035
6.20%
4.29%
8.68%
99,165
68,508
138,829
38,412
3,675,769
0.435
1,598,599
1,520
1,142
1,766
3.00%
2.25%
3.52%
48,017
35,927
56,272
38,412
3,675,769
0.435
1,598,599
1,096
578
1,512
2.16%
1.14%
2.98%
34,462
18,157
47,625
38,412
3,675,769
0.435
1,598,599
444
107
902
0.87%
0.21%
1.77%
13,958
3,358
28,343
38,412
3,675,769
0.435
1,598,599
30
1
110
0.06%
0.00%
0.22%
930
35
3,441
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 6 of 114
December 2016

-------
C.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPs
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted to
have Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
All EPs Only
0.6
1,124
2,812
3.987
11,213
199
154
255
20.57%
16.15%
25.95%
2,307
1,811
2,910
2
1,124
2,812
3.987
11,213
82
67
102
9.01%
7.35%
11.01%
1,010
824
1,235
6
1,124
2,812
3.987
11,213
29
22
37
3.12%
2.34%
3.99%
350
262
447
10
1,124
2,812
3.987
11,213
17
12
22
1.66%
1.13%
2.27%
186
127
255
20
1,124
2,812
3.987
11,213
7
4
10
0.60%
0.33%
0.95%
68
37
107
60
1,124
2,812
3.987
11,213
1
1
3
0.09%
0.03%
0.18%
10
4
20
100
1,124
2,812
3.987
11,213
0
0
1
0.03%
0.01%
0.07%
3
1
8
200
1,124
2,812
3.987
11,213
0
0
0
0.00%
0.00%
0.01%
0
0
2
600
1,124
2,812
3.987
11,213
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
153
732
1.275
933
62
51
75
40.57%
33.05%
49.33%
379
309
460
2
153
732
1.275
933
31
26
36
19.96%
16.92%
23.72%
186
158
221
6
153
732
1.275
933
13
11
16
8.78%
7.24%
10.38%
82
68
97
10
153
732
1.275
933
8
7
10
5.55%
4.37%
6.83%
52
41
64
20
153
732
1.275
933
4
3
6
2.78%
2.10%
3.66%
26
20
34
60
153
732
1.275
933
1
1
2
0.70%
0.36%
1.12%
7
3
10
100
153
732
1.275
933
0
0
1
0.27%
0.08%
0.55%
3
1
5
200
153
732
1.275
933
0
0
0
0.05%
0.01%
0.14%
0
0
1
600
153
732
1.275
933
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
770
1,288
4.724
6,084
74
53
102
9.66%
6.83%
13.25%
588
415
806
2
770
1,288
4.724
6,084
21
15
30
2.75%
1.96%
3.83%
167
119
233
6
770
1,288
4.724
6,084
5
3
8
0.69%
0.45%
1.00%
42
27
61
10
770
1,288
4.724
6,084
3
2
4
0.37%
0.23%
0.55%
22
14
33
20
770
1,288
4.724
6,084
1
1
2
0.16%
0.07%
0.27%
10
4
17
60
770
1,288
4.724
6,084
0
0
1
0.03%
0.00%
0.07%
2
0
4
100
770
1,288
4.724
6,084
0
0
0
0.01%
0.00%
0.03%
0
0
2
200
770
1,288
4.724
6,084
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
770
1,288
4.724
6,084
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
201
792
5.297
4,195
63
51
78
31.96%
25.92%
39.17%
1,341
1,087
1,643
2
201
792
5.297
4,195
31
26
37
15.65%
13.03%
18.59%
656
547
780
6
201
792
5.297
4,195
11
8
14
5.38%
3.99%
6.90%
226
167
289
10
201
792
5.297
4,195
5
3
7
2.67%
1.72%
3.76%
112
72
158
20
201
792
5.297
4,195
1
1
3
0.76%
0.30%
1.34%
32
13
56
60
201
792
5.297
4,195
0
0
0
0.04%
0.00%
0.12%
2
0
5
100
201
792
5.297
4,195
0
0
0
0.01%
0.00%
0.02%
0
0
1
200
201
792
5.297
4,195
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
201
792
5.297
4,195
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 7 of 114
December 2016

-------
C.l - All Disinfection Types
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by EPs
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
8,477,045
84,318,927
0.597
50,343,187
2,093,021
1,623,491
2,660,559
25.00%
19.28%
31.85%
12,586,922
9,706,603
16,034,561
8,477,045
84,318,927
0.597
50,343,187
961,729
769,701
1,215,638
11.51%
9.23%
14.59%
5,792,261
4,644,394
7,346,718
8,477,045
84,318,927
0.597
50,343,187
382,257
294,019
481,555
4.62%
3.47%
5.84%
2,325,225
1,747,085
2,941,708
8,477,045
84,318,927
0.597
50,343,187
229,252
165,823
302,733
2.73%
1.81%
3.72%
1,372,205
911,519
1,875,201
8,477,045
84,318,927
0.597
50,343,187
103,537
66,201
152,115
1.12%
0.60%
1.85%
565,211
300,832
933,721
8,477,045
84,318,927
0.597
50,343,187
18,365
7,541
35,895
0.16%
0.06%
0.35%
80,782
29,390
175,320
8,477,045
84,318,927
0.597
50,343,187
5,808
1,629
13,262
0.05%
0.01%
0.12%
24,050
6,253
58,184
8,477,045
84,318,927
0.597
50,343,187
786
106
2,270
0.01%
0.00%
0.02%
3,119
404
9,123
8,477,045
84,318,927
0.597
50,343,187
11
0
45
0.00%
0.00%
0.00%
43

175
2,638,844
24,488,354
0.510
12,483,667
1,168,729
970,672
1,386,053
42.30%
34.83%
50.63%
5,280,433
4,348,334
6,320,602
2,638,844
24,488,354
0.510
12,483,667
601,102
500,963
720,479
21.13%
17.51%
25.67%
2,637,317
2,186,137
3,204,134
2,638,844
24,488,354
0.510
12,483,667
259,919
210,573
313,264
8.97%
7.05%
10.92%
1,120,117
879,716
1,363,016
2,638,844
24,488,354
0.510
12,483,667
161,940
127,685
203,012
5.52%
4.10%
7.17%
689,710
511,726
894,889
2,638,844
24,488,354
0.510
12,483,667
79,343
58,583
104,225
2.60%
1.81%
3.67%
324,731
225,724
458,528
2,638,844
24,488,354
0.510
12,483,667
16,259
7,360
28,979
0.50%
0.22%
0.92%
62,930
28,010
114,255
2,638,844
24,488,354
0.510
12,483,667
5,336
1,610
11,508
0.16%
0.05%
0.36%
20,456
6,125
44,318
2,638,844
24,488,354
0.510
12,483,667
740
105
2,097
0.02%
0.00%
0.06%
2,824
401
7,994
2,638,844
24,488,354
0.510
12,483,667
10
0
44
0.00%
0.00%
0.00%
40

168
4,636,297
33,342,501
0.658
21,945,383
556,743
370,576
793,002
11.20%
7.49%
15.82%
2,458,626
1,644,666
3,471,057
4,636,297
33,342,501
0.658
21,945,383
175,797
119,110
260,489
3.44%
2.35%
5.04%
755,705
516,060
1,105,860
4,636,297
33,342,501
0.658
21,945,383
43,553
23,683
69,477
0.86%
0.48%
1.34%
188,105
106,265
294,405
4,636,297
33,342,501
0.658
21,945,383
20,836
10,254
35,866
0.42%
0.22%
0.70%
92,365
47,986
154,239
4,636,297
33,342,501
0.658
21,945,383
7,467
2,784
14,367
0.16%
0.06%
0.29%
34,856
13,583
64,715
4,636,297
33,342,501
0.658
21,945,383
1,008
119
2,848
0.02%
0.00%
0.06%
4,930
591
13,837
4,636,297
33,342,501
0.658
21,945,383
283
15
956
0.01%
0.00%
0.02%
1,394
74
4,707
4,636,297
33,342,501
0.658
21,945,383
34
0
131
0.00%
0.00%
0.00%
170
2
649
4,636,297
33,342,501
0.658
21,945,383
1
0
1
0.00%
0.00%
0.00%
3
0
6
1,201,904
26,488,072
0.601
15,914,137
367,550
282,243
481,504
30.46%
23.34%
39.23%
4,847,864
3,713,604
6,242,902
1,201,904
26,488,072
0.601
15,914,137
184,830
149,627
234,669
15.08%
12.20%
19.08%
2,399,239
1,942,197
3,036,725
1,201,904
26,488,072
0.601
15,914,137
78,785
59,764
98,814
6.39%
4.78%
8.07%
1,017,004
761,104
1,284,287
1,201,904
26,488,072
0.601
15,914,137
46,476
27,884
63,855
3.71%
2.21%
5.19%
590,131
351,807
826,073
1,201,904
26,488,072
0.601
15,914,137
16,727
4,834
33,523
1.29%
0.39%
2.58%
205,623
61,525
410,478
1,201,904
26,488,072
0.601
15,914,137
1,098
61
4,068
0.08%
0.00%
0.30%
12,922
789
47,229
1,201,904
26,488,072
0.601
15,914,137
190
4
798
0.01%
0.00%
0.06%
2,200
54
9,159
1,201,904
26,488,072
0.601
15,914,137
11
0
42
0.00%
0.00%
0.00%
125

480
1,201,904
26,488,072
0.601
15,914,137
0
0
0
0.00%
0.00%
0.00%
0
0
1
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 8 of 114
December 2016

-------
C.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number of
MRs with Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation



Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)

0.6
538
2,812
1.858
5,226
193
157
232
40.88%
33.41%
48.96%
2,136
1,746
2,559

2
538
2,812
1.858
5,226
87
73
105
18.93%
15.67%
22.78%
989
819
1,191

6
538
2,812
1.858
5,226
35
28
42
7.26%
5.79%
8.86%
379
302
463

10
538
2,812
1.858
5,226
20
15
25
4.10%
3.01%
5.27%
214
157
276
All MRs Only
20
538
2,812
1.858
5,226
8
5
11
1.45%
0.84%
2.19%
76
44
114

60
538
2,812
1.858
5,226
1
0
2
0.12%
0.04%
0.26%
6
2
14

100
538
2,812
1.858
5,226
0
0
0
0.02%
0.00%
0.06%
1
0
3

200
538
2,812
1.858
5,226
0
0
0
0.00%
0.00%
0.01%
0
0
0

600
538
2,812
1.858
5,226
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
137
732
1.208
885
82
72
92
64.19%
56.69%
71.63%
568
502
634

2
137
732
1.208
885
44
38
50
36.36%
31.99%
40.91%
322
283
362

6
137
732
1.208
885
20
18
23
17.26%
15.27%
19.52%
153
135
173
MRs Only at
10
137
732
1.208
885
13
11
15
10.91%
9.10%
12.65%
96
81
112
Surface Water
20
137
732
1.208
885
5
4
7
4.71%
3.35%
6.17%
42
30
55
Systems
60
137
732
1.208
885
1
0
1
0.54%
0.19%
1.09%
5
2
10

100
137
732
1.208
885
0
0
0
0.12%
0.02%
0.31%
1
0
3

200
137
732
1.208
885
0
0
0
0.01%
0.00%
0.03%
0
0
0

600
137
732
1.208
885
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
303
1,288
1.908
2,457
58
41
79
22.02%
15.65%
29.39%
541
385
722

2
303
1,288
1.908
2,457
16
11
22
6.44%
4.64%
8.88%
158
114
218

6
303
1,288
1.908
2,457
3
2
5
1.52%
0.88%
2.24%
37
22
55
MRs Only at
10
303
1,288
1.908
2,457
1
1
2
0.65%
0.27%
1.11%
16
7
27
Ground Water
20
303
1,288
1.908
2,457
0
0
1
0.15%
0.03%
0.36%
4
1
9
Systems
60
303
1,288
1.908
2,457
0
0
0
0.01%
0.00%
0.02%
0
0
0

100
303
1,288
1.908
2,457
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
303
1,288
1.908
2,457
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
303
1,288
1.908
2,457
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
98
792
2.378
1,883
52
44
60
54.55%
45.66%
63.86%
1,027
860
1,203

2
98
792
2.378
1,883
27
23
33
27.04%
22.38%
32.42%
509
422
611

6
98
792
2.378
1,883
11
9
14
10.04%
7.74%
12.49%
189
146
235
MRs Only at
10
98
792
2.378
1,883
6
4
8
5.41%
3.71%
7.24%
102
70
136
Mixed Water
20
98
792
2.378
1,883
2
1
3
1.62%
0.72%
2.71%
30
14
51
Systems
60
98
792
2.378
1,883
0
0
0
0.06%
0.01%
0.18%
1
0
3

100
98
792
2.378
1,883
0
0
0
0.01%
0.00%
0.03%
0
0
0

200
98
792
2.378
1,883
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
98
792
2.378
1,883
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 9 of 114
December 2016

-------
C.l - All Disinfection Types
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
5,551,969
84,318,927
0.380
32,076,145
2,459,788
2,004,908
2,962,038
45.31%
36.72%
54.79%
14,532,814
11,776,969
17,573,791
5,551,969
84,318,927
0.380
32,076,145
1,241,428
1,049,230
1,491,082
22.81%
19.18%
27.49%
7,316,755
6,151,435
8,818,155
5,551,969
84,318,927
0.380
32,076,145
557,353
456,300
668,836
10.35%
8.31%
12.56%
3,319,083
2,665,563
4,027,414
5,551,969
84,318,927
0.380
32,076,145
337,072
253,306
424,539
6.24%
4.51%
8.05%
2,002,975
1,446,697
2,582,453
5,551,969
84,318,927
0.380
32,076,145
130,141
81,361
189,933
2.34%
1.28%
3.64%
749,548
410,324
1,167,393
5,551,969
84,318,927
0.380
32,076,145
12,246
3,663
27,319
0.19%
0.05%
0.47%
60,638
15,189
151,721
5,551,969
84,318,927
0.380
32,076,145
2,583
464
7,426
0.04%
0.01%
0.11%
11,865
1,840
36,627
5,551,969
84,318,927
0.380
32,076,145
186
12
624
0.00%
0.00%
0.01%
791
48
2,738
5,551,969
84,318,927
0.380
32,076,145
1
0
3
0.00%
0.00%
0.00%
4
0
10
2,549,091
24,488,354
0.493
12,080,736
1,491,463
1,299,636
1,692,990
56.02%
48.35%
64.01%
6,767,080
5,841,234
7,732,816
2,549,091
24,488,354
0.493
12,080,736
831,093
734,338
947,401
29.84%
26.03%
34.35%
3,604,520
3,144,031
4,150,118
2,549,091
24,488,354
0.493
12,080,736
394,454
339,623
454,433
13.95%
11.95%
16.25%
1,685,243
1,443,267
1,962,608
2,549,091
24,488,354
0.493
12,080,736
246,417
197,205
293,995
8.80%
6.92%
10.56%
1,063,516
835,952
1,275,735
2,549,091
24,488,354
0.493
12,080,736
102,091
70,637
137,963
3.73%
2.39%
5.24%
450,735
288,710
632,996
2,549,091
24,488,354
0.493
12,080,736
11,053
3,540
23,415
0.40%
0.11%
0.92%
47,853
13,755
110,834
2,549,091
24,488,354
0.493
12,080,736
2,431
456
6,845
0.08%
0.01%
0.25%
10,244
1,755
30,538
2,549,091
24,488,354
0.493
12,080,736
181
12
604
0.01%
0.00%
0.02%
737
47
2,534
2,549,091
24,488,354
0.493
12,080,736
1
0
3
0.00%
0.00%
0.00%
4
0
10
2,385,671
33,342,501
0.334
11,130,020
600,230
402,336
828,979
23.36%
15.68%
32.35%
2,599,756
1,744,824
3,601,042
2,385,671
33,342,501
0.334
11,130,020
192,968
126,007
288,344
7.20%
4.66%
10.71%
801,470
519,085
1,191,758
2,385,671
33,342,501
0.334
11,130,020
49,152
26,813
76,951
1.77%
0.96%
2.79%
197,115
106,789
310,249
2,385,671
33,342,501
0.334
11,130,020
21,618
8,835
38,553
0.77%
0.31%
1.38%
85,780
34,901
153,575
2,385,671
33,342,501
0.334
11,130,020
4,975
967
12,003
0.18%
0.03%
0.43%
19,591
3,800
47,324
2,385,671
33,342,501
0.334
11,130,020
168
5
618
0.01%
0.00%
0.02%
660
20
2,424
2,385,671
33,342,501
0.334
11,130,020
22
0
87
0.00%
0.00%
0.00%
84

340
2,385,671
33,342,501
0.334
11,130,020
1
0
3
0.00%
0.00%
0.00%
3
0
10
2,385,671
33,342,501
0.334
11,130,020
0
0
0
0.00%
0.00%
0.00%
0
0
0
617,208
26,488,072
0.335
8,865,389
368,094
302,936
440,069
58.27%
47.27%
70.39%
5,165,977
4,190,911
6,239,933
617,208
26,488,072
0.335
8,865,389
217,368
188,885
255,337
32.83%
28.07%
39.21%
2,910,765
2,488,319
3,476,279
617,208
26,488,072
0.335
8,865,389
113,747
89,864
137,452
16.21%
12.58%
19.79%
1,436,725
1,115,507
1,754,557
617,208
26,488,072
0.335
8,865,389
69,038
47,265
91,992
9.63%
6.50%
13.01%
853,679
575,844
1,153,142
617,208
26,488,072
0.335
8,865,389
23,075
9,758
39,968
3.15%
1.33%
5.49%
279,222
117,814
487,074
617,208
26,488,072
0.335
8,865,389
1,025
118
3,287
0.14%
0.02%
0.43%
12,125
1,415
38,464
617,208
26,488,072
0.335
8,865,389
131
7
495
0.02%
0.00%
0.06%
1,536
84
5,749
617,208
26,488,072
0.335
8,865,389
4
0
17
0.00%
0.00%
0.00%
51

194
617,208
26,488,072
0.335
8,865,389
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 10 of 114
December 2016

-------
C.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPs
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted to
have Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All EPs Only
0.6
2,865
398
7.015
2,792
597
495
711
21.03%
17.55%
24.88%
587
490
695
2
2,865
398
7.015
2,792
217
188
251
7.70%
6.73%
8.87%
215
188
248
6
2,865
398
7.015
2,792
72
61
83
2.56%
2.18%
2.97%
72
61
83
10
2,865
398
7.015
2,792
39
32
47
1.39%
1.14%
1.68%
39
32
47
20
2,865
398
7.015
2,792
15
11
20
0.55%
0.40%
0.71%
15
11
20
60
2,865
398
7.015
2,792
2
1
4
0.08%
0.04%
0.14%
2
1
4
100
2,865
398
7.015
2,792
1
0
2
0.03%
0.01%
0.06%
1
0
2
200
2,865
398
7.015
2,792
0
0
0
0.00%
0.00%
0.01%
0
0
0
600
2,865
398
7.015
2,792
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
400
218
1.835
400
151
130
174
37.70%
32.49%
43.57%
151
130
174
2
400
218
1.835
400
74
66
83
18.46%
16.51%
20.80%
74
66
83
6
400
218
1.835
400
30
27
34
7.62%
6.72%
8.62%
30
27
34
10
400
218
1.835
400
18
15
21
4.53%
3.84%
5.31%
18
15
21
20
400
218
1.835
400
8
6
10
1.97%
1.48%
2.51%
8
6
10
60
400
218
1.835
400
2
1
3
0.38%
0.19%
0.63%
2
1
3
100
400
218
1.835
400
1
0
1
0.15%
0.04%
0.29%
1
0
1
200
400
218
1.835
400
0
0
0
0.03%
0.00%
0.09%
0
0
0
600
400
218
1.835
400
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
1,042
72
14.472
1,042
136
101
175
13.02%
9.71%
16.79%
136
101
175
2
1,042
72
14.472
1,042
23
16
31
2.19%
1.53%
2.99%
23
16
31
6
1,042
72
14.472
1,042
3
1
4
0.24%
0.12%
0.40%
3
1
4
10
1,042
72
14.472
1,042
1
0
2
0.07%
0.02%
0.16%
1
0
2
20
1,042
72
14.472
1,042
0
0
0
0.01%
0.00%
0.04%
0
0
0
60
1,042
72
14.472
1,042
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1,042
72
14.472
1,042
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1,042
72
14.472
1,042
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1,042
72
14.472
1,042
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
1,423
108
12.500
1,350
311
264
362
22.28%
19.18%
25.58%
301
259
345
2
1,423
108
12.500
1,350
120
106
136
8.77%
7.84%
9.87%
118
106
133
6
1,423
108
12.500
1,350
39
33
45
2.85%
2.43%
3.29%
39
33
44
10
1,423
108
12.500
1,350
20
16
24
1.48%
1.21%
1.78%
20
16
24
20
1,423
108
12.500
1,350
7
5
9
0.54%
0.39%
0.70%
7
5
9
60
1,423
108
12.500
1,350
1
0
1
0.06%
0.02%
0.10%
1
0
1
100
1,423
108
12.500
1,350
0
0
0
0.01%
0.00%
0.03%
0
0
0
200
1,423
108
12.500
1,350
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1,423
108
12.500
1,350
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 11 of 114
December 2016

-------
C.l - All Disinfection Types
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by EPs
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
79,782,373
141,981,684
0.559
79,385,608
24,953,710
19,883,896
31,451,117
31.39%
25.03%
39.55%
24,921,981
19,870,540
31,396,075
79,782,373
141,981,684
0.559
79,385,608
10,698,208
8,928,356
13,080,340
13.47%
11.25%
16.46%
10,693,602
8,927,095
13,070,310
79,782,373
141,981,684
0.559
79,385,608
3,900,823
3,267,623
4,650,890
4.91%
4.12%
5.86%
3,900,509
3,267,596
4,649,894
79,782,373
141,981,684
0.559
79,385,608
2,254,246
1,847,702
2,802,328
2.84%
2.33%
3.53%
2,254,183
1,847,700
2,802,066
79,782,373
141,981,684
0.559
79,385,608
967,643
717,749
1,249,874
1.22%
0.90%
1.57%
967,638
717,749
1,249,853
79,782,373
141,981,684
0.559
79,385,608
157,572
75,158
285,670
0.20%
0.09%
0.36%
157,572
75,158
285,670
79,782,373
141,981,684
0.559
79,385,608
52,607
17,182
111,515
0.07%
0.02%
0.14%
52,607
17,182
111,515
79,782,373
141,981,684
0.559
79,385,608
8,727
1,173
23,750
0.01%
0.00%
0.03%
8,727
1,173
23,750
79,782,373
141,981,684
0.559
79,385,608
187
4
819
0.00%
0.00%
0.00%
187
4
819
46,706,020
89,237,751
0.523
46,706,020
17,732,171
14,253,174
22,127,389
37.97%
30.52%
47.38%
17,732,171
14,253,174
22,127,389
46,706,020
89,237,751
0.523
46,706,020
7,901,784
6,655,171
9,521,760
16.92%
14.25%
20.39%
7,901,784
6,655,171
9,521,760
46,706,020
89,237,751
0.523
46,706,020
2,953,846
2,514,322
3,458,875
6.32%
5.38%
7.41%
2,953,846
2,514,322
3,458,875
46,706,020
89,237,751
0.523
46,706,020
1,722,474
1,425,731
2,103,396
3.69%
3.05%
4.50%
1,722,474
1,425,731
2,103,396
46,706,020
89,237,751
0.523
46,706,020
744,279
552,196
958,538
1.59%
1.18%
2.05%
744,279
552,196
958,538
46,706,020
89,237,751
0.523
46,706,020
130,641
63,773
239,218
0.28%
0.14%
0.51%
130,641
63,773
239,218
46,706,020
89,237,751
0.523
46,706,020
46,471
15,446
98,394
0.10%
0.03%
0.21%
46,471
15,446
98,394
46,706,020
89,237,751
0.523
46,706,020
8,242
1,101
22,378
0.02%
0.00%
0.05%
8,242
1,101
22,378
46,706,020
89,237,751
0.523
46,706,020
184
4
809
0.00%
0.00%
0.00%
184
4
809
11,632,265
18,472,835
0.630
11,632,265
1,505,761
861,171
2,441,248
12.94%
7.40%
20.99%
1,505,761
861,171
2,441,248
11,632,265
18,472,835
0.630
11,632,265
370,312
207,511
684,478
3.18%
1.78%
5.88%
370,312
207,511
684,478
11,632,265
18,472,835
0.630
11,632,265
63,767
19,220
131,565
0.55%
0.17%
1.13%
63,767
19,220
131,565
11,632,265
18,472,835
0.630
11,632,265
21,851
3,590
62,339
0.19%
0.03%
0.54%
21,851
3,590
62,339
11,632,265
18,472,835
0.630
11,632,265
3,534
212
14,521
0.03%
0.00%
0.12%
3,534
212
14,521
11,632,265
18,472,835
0.630
11,632,265
70
0
344
0.00%
0.00%
0.00%
70
0
344
11,632,265
18,472,835
0.630
11,632,265
7
0
32
0.00%
0.00%
0.00%
7
0
32
11,632,265
18,472,835
0.630
11,632,265
0
0
1
0.00%
0.00%
0.00%
0
0
1
11,632,265
18,472,835
0.630
11,632,265
0
0
0
0.00%
0.00%
0.00%
0
0
0
21,444,088
34,271,098
0.614
21,047,322
5,715,778
4,769,552
6,882,480
27.01%
22.60%
32.44%
5,684,048
4,756,196
6,827,438
21,444,088
34,271,098
0.614
21,047,322
2,426,113
2,065,675
2,874,102
11.51%
9.81%
13.61%
2,421,506
2,064,413
2,864,072
21,444,088
34,271,098
0.614
21,047,322
883,210
734,081
1,060,451
4.19%
3.49%
5.03%
882,896
734,054
1,059,455
21,444,088
34,271,098
0.614
21,047,322
509,921
418,381
636,594
2.42%
1.99%
3.02%
509,858
418,379
636,332
21,444,088
34,271,098
0.614
21,047,322
219,829
165,341
276,815
1.04%
0.79%
1.32%
219,824
165,341
276,794
21,444,088
34,271,098
0.614
21,047,322
26,861
11,384
46,107
0.13%
0.05%
0.22%
26,861
11,384
46,107
21,444,088
34,271,098
0.614
21,047,322
6,129
1,736
13,090
0.03%
0.01%
0.06%
6,129
1,736
13,090
21,444,088
34,271,098
0.614
21,047,322
485
72
1,371
0.00%
0.00%
0.01%
485
72
1,371
21,444,088
34,271,098
0.614
21,047,322
3
0
10
0.00%
0.00%
0.00%
3
0
10
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 12 of 114
December 2016

-------
C.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number of
MRs with Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All MRs Only
0.6
1,357
398
3.384
1,347
581
510
661
42.88%
37.65%
48.75%
578
507
657
2
1,357
398
3.384
1,347
297
270
329
21.85%
19.87%
24.16%
294
268
325
6
1,357
398
3.384
1,347
125
112
139
9.20%
8.24%
10.23%
124
111
138
10
1,357
398
3.384
1,347
71
62
80
5.19%
4.51%
5.90%
70
61
80
20
1,357
398
3.384
1,347
27
22
33
2.00%
1.60%
2.43%
27
22
33
60
1,357
398
3.384
1,347
3
2
5
0.25%
0.15%
0.40%
3
2
5
100
1,357
398
3.384
1,347
1
0
2
0.08%
0.03%
0.15%
1
0
2
200
1,357
398
3.384
1,347
0
0
1
0.02%
0.00%
0.04%
0
0
1
600
1,357
398
3.384
1,347
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
373
218
1.683
367
210
191
231
55.77%
50.57%
61.56%
205
186
226
2
373
218
1.683
367
128
119
138
33.68%
31.26%
36.45%
124
115
134
6
373
218
1.683
367
58
52
63
15.15%
13.75%
16.64%
56
50
61
10
373
218
1.683
367
32
28
36
8.45%
7.42%
9.55%
31
27
35
20
373
218
1.683
367
12
10
15
3.15%
2.49%
3.84%
12
9
14
60
373
218
1.683
367
2
1
3
0.46%
0.31%
0.68%
2
1
2
100
373
218
1.683
367
1
0
1
0.19%
0.08%
0.31%
1
0
1
200
373
218
1.683
367
0
0
0
0.05%
0.01%
0.12%
0
0
0
600
373
218
1.683
367
0
0
0
0.00%
0.00%
0.01%
0
0
0
MRs Only at
Ground Water
Systems
0.6
488
72
6.806
490
115
86
147
23.79%
17.79%
30.34%
117
87
149
2
488
72
6.806
490
22
15
30
4.62%
3.26%
6.37%
23
16
31
6
488
72
6.806
490
3
2
5
0.69%
0.39%
1.06%
3
2
5
10
488
72
6.806
490
1
0
2
0.21%
0.09%
0.38%
1
0
2
20
488
72
6.806
490
0
0
0
0.03%
0.01%
0.07%
0
0
0
60
488
72
6.806
490
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
488
72
6.806
490
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
488
72
6.806
490
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
488
72
6.806
490
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
496
108
4.537
490
256
233
282
52.31%
47.83%
57.57%
256
234
282
2
496
108
4.537
490
147
136
160
30.22%
27.95%
32.74%
148
137
160
6
496
108
4.537
490
64
58
71
13.26%
11.96%
14.59%
65
59
71
10
496
108
4.537
490
38
33
42
7.73%
6.76%
8.69%
38
33
43
20
496
108
4.537
490
15
12
18
3.12%
2.53%
3.73%
15
12
18
60
496
108
4.537
490
2
1
3
0.35%
0.18%
0.58%
2
1
3
100
496
108
4.537
490
0
0
1
0.08%
0.02%
0.18%
0
0
1
200
496
108
4.537
490
0
0
0
0.01%
0.00%
0.02%
0
0
0
600
496
108
4.537
490
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 13 of 114
December 2016

-------
C.l - All Disinfection Types
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
62,199,311
141,981,684
0.438
62,190,368
34,553,457
29,624,384
40,038,751
55.55%
47.63%
64.37%
34,547,822
29,620,270
40,030,692
62,199,311
141,981,684
0.438
62,190,368
19,815,649
17,620,849
22,823,246
31.86%
28.33%
36.69%
19,813,209
17,620,149
22,818,966
62,199,311
141,981,684
0.438
62,190,368
8,101,282
6,930,843
9,441,027
13.03%
11.14%
15.18%
8,100,949
6,930,831
9,439,932
62,199,311
141,981,684
0.438
62,190,368
4,368,290
3,620,750
5,300,396
7.02%
5.82%
8.52%
4,368,208
3,620,749
5,300,073
62,199,311
141,981,684
0.438
62,190,368
1,607,844
1,234,446
2,014,678
2.59%
1.98%
3.24%
1,607,836
1,234,446
2,014,647
62,199,311
141,981,684
0.438
62,190,368
195,023
102,550
336,306
0.31%
0.16%
0.54%
195,023
102,550
336,306
62,199,311
141,981,684
0.438
62,190,368
60,718
24,087
117,050
0.10%
0.04%
0.19%
60,718
24,087
117,050
62,199,311
141,981,684
0.438
62,190,368
10,999
1,623
28,681
0.02%
0.00%
0.05%
10,999
1,623
28,681
62,199,311
141,981,684
0.438
62,190,368
248
4
997
0.00%
0.00%
0.00%
248
4
997
42,531,731
89,237,751
0.477
42,531,731
25,494,130
22,094,503
29,204,407
59.94%
51.95%
68.66%
25,494,130
22,094,503
29,204,407
42,531,731
89,237,751
0.477
42,531,731
14,879,664
13,343,394
16,978,676
34.98%
31.37%
39.92%
14,879,664
13,343,394
16,978,676
42,531,731
89,237,751
0.477
42,531,731
6,005,132
5,197,073
6,931,220
14.12%
12.22%
16.30%
6,005,132
5,197,073
6,931,220
42,531,731
89,237,751
0.477
42,531,731
3,150,656
2,631,647
3,774,355
7.41%
6.19%
8.87%
3,150,656
2,631,647
3,774,355
42,531,731
89,237,751
0.477
42,531,731
1,110,244
842,350
1,377,657
2.61%
1.98%
3.24%
1,110,244
842,350
1,377,657
42,531,731
89,237,751
0.477
42,531,731
135,714
73,645
235,575
0.32%
0.17%
0.55%
135,714
73,645
235,575
42,531,731
89,237,751
0.477
42,531,731
47,362
19,901
85,979
0.11%
0.05%
0.20%
47,362
19,901
85,979
42,531,731
89,237,751
0.477
42,531,731
10,015
1,481
25,486
0.02%
0.00%
0.06%
10,015
1,481
25,486
42,531,731
89,237,751
0.477
42,531,731
244
4
980
0.00%
0.00%
0.00%
244
4
980
6,840,570
18,472,835
0.370
6,840,570
2,566,941
1,965,298
3,134,999
37.53%
28.73%
45.83%
2,566,941
1,965,298
3,134,999
6,840,570
18,472,835
0.370
6,840,570
1,193,255
882,849
1,642,135
17.44%
12.91%
24.01%
1,193,255
882,849
1,642,135
6,840,570
18,472,835
0.370
6,840,570
308,096
144,592
520,253
4.50%
2.11%
7.61%
308,096
144,592
520,253
6,840,570
18,472,835
0.370
6,840,570
111,335
35,168
249,528
1.63%
0.51%
3.65%
111,335
35,168
249,528
6,840,570
18,472,835
0.370
6,840,570
17,111
2,427
55,272
0.25%
0.04%
0.81%
17,111
2,427
55,272
6,840,570
18,472,835
0.370
6,840,570
257
6
1,036
0.00%
0.00%
0.02%
257
6
1,036
6,840,570
18,472,835
0.370
6,840,570
21
0
77
0.00%
0.00%
0.00%
21
0
77
6,840,570
18,472,835
0.370
6,840,570
0
0
1
0.00%
0.00%
0.00%
0
0
1
6,840,570
18,472,835
0.370
6,840,570
0
0
0
0.00%
0.00%
0.00%
0
0
0
12,827,010
34,271,098
0.374
12,818,067
6,492,386
5,564,583
7,699,345
50.61%
43.38%
60.00%
6,486,751
5,560,469
7,691,286
12,827,010
34,271,098
0.374
12,818,067
3,742,730
3,394,606
4,202,435
29.18%
26.48%
32.75%
3,740,290
3,393,906
4,198,155
12,827,010
34,271,098
0.374
12,818,067
1,788,054
1,589,179
1,989,553
13.95%
12.40%
15.51%
1,787,721
1,589,166
1,988,458
12,827,010
34,271,098
0.374
12,818,067
1,106,299
953,936
1,276,514
8.63%
7.44%
9.96%
1,106,217
953,935
1,276,190
12,827,010
34,271,098
0.374
12,818,067
480,488
389,669
581,749
3.75%
3.04%
4.54%
480,480
389,669
581,719
12,827,010
34,271,098
0.374
12,818,067
59,051
28,899
99,695
0.46%
0.23%
0.78%
59,051
28,899
99,695
12,827,010
34,271,098
0.374
12,818,067
13,335
4,186
30,994
0.10%
0.03%
0.24%
13,335
4,186
30,994
12,827,010
34,271,098
0.374
12,818,067
984
142
3,195
0.01%
0.00%
0.02%
984
142
3,195
12,827,010
34,271,098
0.374
12,818,067
4
0
17
0.00%
0.00%
0.00%
4
0
17
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 14 of 114
December 2016

-------
C.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPs
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted to
have Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All EPs Only
0.6
4,666
45,172
1.856
83,836
949
767
1,159
12.65%
8.59%
17.70%
10,609
7,200
14,836
2
4,666
45,172
1.856
83,836
368
311
438
4.76%
3.47%
6.47%
3,994
2,906
5,422
6
4,666
45,172
1.856
83,836
132
109
158
1.76%
1.29%
2.38%
1,475
1,082
1,999
10
4,666
45,172
1.856
83,836
76
60
95
1.07%
0.77%
1.47%
897
647
1,233
20
4,666
45,172
1.856
83,836
34
24
45
0.50%
0.32%
0.73%
418
267
608
60
4,666
45,172
1.856
83,836
7
3
12
0.10%
0.03%
0.19%
81
28
158
100
4,666
45,172
1.856
83,836
3
1
6
0.04%
0.01%
0.09%
30
6
71
200
4,666
45,172
1.856
83,836
1
0
2
0.01%
0.00%
0.02%
5
1
18
600
4,666
45,172
1.856
83,836
0
0
0
0.00%
0.00%
0.00%
0
0
1
EPs Only at Surface
Water Systems
0.6
785
2,936
1.161
3,409
309
262
362
40.66%
34.12%
48.02%
1,386
1,163
1,637
2
785
2,936
1.161
3,409
150
132
172
19.64%
17.04%
22.77%
669
581
776
6
785
2,936
1.161
3,409
65
56
75
8.81%
7.49%
10.24%
300
255
349
10
785
2,936
1.161
3,409
41
34
49
5.85%
4.83%
6.95%
199
165
237
20
785
2,936
1.161
3,409
21
16
26
3.24%
2.52%
4.03%
111
86
137
60
785
2,936
1.161
3,409
6
3
9
1.01%
0.54%
1.53%
35
18
52
100
785
2,936
1.161
3,409
2
1
5
0.47%
0.15%
0.87%
16
5
30
200
785
2,936
1.161
3,409
1
0
2
0.11%
0.01%
0.31%
4
0
11
600
785
2,936
1.161
3,409
0
0
0
0.00%
0.00%
0.02%
0
0
1
EPs Only at Ground
Water Systems
0.6
2,211
39,885
1.784
71,174
239
168
324
7.48%
4.00%
12.00%
5,325
2,846
8,543
2
2,211
39,885
1.784
71,174
50
34
72
1.65%
0.78%
2.91%
1,172
552
2,069
6
2,211
39,885
1.784
71,174
9
5
14
0.26%
0.07%
0.59%
184
53
418
10
2,211
39,885
1.784
71,174
4
2
7
0.09%
0.02%
0.25%
66
18
176
20
2,211
39,885
1.784
71,174
1
1
3
0.02%
0.01%
0.06%
16
5
43
60
2,211
39,885
1.784
71,174
0
0
1
0.00%
0.00%
0.01%
2
0
5
100
2,211
39,885
1.784
71,174
0
0
0
0.00%
0.00%
0.00%
0
0
2
200
2,211
39,885
1.784
71,174
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
2,211
39,885
1.784
71,174
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
1,670
2,351
3.936
9,253
402
337
473
42.12%
34.48%
50.32%
3,898
3,191
4,656
2
1,670
2,351
3.936
9,253
168
146
194
23.26%
19.16%
27.85%
2,152
1,772
2,577
6
1,670
2,351
3.936
9,253
58
48
69
10.71%
8.36%
13.31%
991
774
1,231
10
1,670
2,351
3.936
9,253
31
24
39
6.83%
5.02%
8.86%
632
464
820
20
1,670
2,351
3.936
9,253
12
8
17
3.15%
1.91%
4.63%
291
176
428
60
1,670
2,351
3.936
9,253
1
0
3
0.48%
0.10%
1.09%
44
10
101
100
1,670
2,351
3.936
9,253
0
0
1
0.14%
0.01%
0.43%
13
1
40
200
1,670
2,351
3.936
9,253
0
0
0
0.02%
0.00%
0.07%
2
0
7
600
1,670
2,351
3.936
9,253
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 15 of 114
December 2016

-------
C.l - All Disinfection Types
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by EPs
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
88,936,169
267,455,451
0.583
155,937,382
27,238,360
21,655,758
34,352,830
26.83%
20.78%
34.34%
41,845,582
32,399,918
53,554,351
88,936,169
267,455,451
0.583
155,937,382
11,758,375
9,777,489
14,417,852
11.71%
9.47%
14.75%
18,262,289
14,763,971
23,005,887
88,936,169
267,455,451
0.583
155,937,382
4,331,105
3,598,768
5,192,846
4.42%
3.50%
5.50%
6,893,837
5,459,816
8,577,658
88,936,169
267,455,451
0.583
155,937,382
2,516,038
2,038,209
3,147,316
2.59%
1.94%
3.39%
4,034,532
3,027,651
5,281,401
88,936,169
267,455,451
0.583
155,937,382
1,089,321
797,223
1,426,031
1.11%
0.73%
1.59%
1,727,444
1,141,345
2,477,309
88,936,169
267,455,451
0.583
155,937,382
181,759
86,022
330,466
0.18%
0.08%
0.35%
284,036
126,658
539,384
88,936,169
267,455,451
0.583
155,937,382
61,375
19,876
129,831
0.06%
0.02%
0.13%
97,362
30,055
209,125
88,936,169
267,455,451
0.583
155,937,382
10,357
1,393
28,179
0.01%
0.00%
0.03%
17,226
2,261
47,283
88,936,169
267,455,451
0.583
155,937,382
232
5
1,003
0.00%
0.00%
0.00%
434
9
1,834
49,633,656
118,756,915
0.520
61,729,578
19,033,361
15,334,232
23,671,079
38.99%
31.52%
48.16%
24,066,988
19,455,977
29,728,203
49,633,656
118,756,915
0.520
61,729,578
8,575,855
7,218,523
10,326,922
17.91%
15.02%
21.61%
11,053,231
9,270,075
13,340,970
49,633,656
118,756,915
0.520
61,729,578
3,251,758
2,755,378
3,817,731
6.99%
5.81%
8.29%
4,316,869
3,585,878
5,116,252
49,633,656
118,756,915
0.520
61,729,578
1,910,792
1,574,219
2,339,457
4.17%
3.34%
5.20%
2,576,929
2,064,380
3,207,389
49,633,656
118,756,915
0.520
61,729,578
839,007
622,539
1,082,298
1.88%
1.37%
2.49%
1,162,107
847,401
1,537,366
49,633,656
118,756,915
0.520
61,729,578
152,310
74,362
276,196
0.37%
0.18%
0.65%
225,350
110,724
400,925
49,633,656
118,756,915
0.520
61,729,578
54,643
18,107
114,595
0.14%
0.04%
0.28%
83,598
27,746
170,260
49,633,656
118,756,915
0.520
61,729,578
9,811
1,320
26,569
0.03%
0.00%
0.07%
15,949
2,169
42,725
49,633,656
118,756,915
0.520
61,729,578
228
5
991
0.00%
0.00%
0.00%
422
9
1,789
16,608,066
84,263,597
0.654
55,143,632
2,089,475
1,244,765
3,279,668
10.69%
6.20%
16.61%
5,895,820
3,418,254
9,157,732
16,608,066
84,263,597
0.654
55,143,632
552,423
328,865
957,185
2.91%
1.61%
4.97%
1,606,368
888,385
2,742,499
16,608,066
84,263,597
0.654
55,143,632
108,316
43,025
203,935
0.59%
0.24%
1.17%
326,045
134,432
643,923
16,608,066
84,263,597
0.654
55,143,632
43,007
13,862
99,422
0.25%
0.10%
0.55%
137,140
52,862
301,709
16,608,066
84,263,597
0.654
55,143,632
11,050
2,997
29,104
0.08%
0.03%
0.17%
41,596
13,846
93,304
16,608,066
84,263,597
0.654
55,143,632
1,079
120
3,196
0.01%
0.00%
0.03%
5,053
592
14,403
16,608,066
84,263,597
0.654
55,143,632
290
15
988
0.00%
0.00%
0.01%
1,406
74
4,756
16,608,066
84,263,597
0.654
55,143,632
35
0
132
0.00%
0.00%
0.00%
170
2
650
16,608,066
84,263,597
0.654
55,143,632
1
0
1
0.00%
0.00%
0.00%
3
0
6
22,694,447
64,434,939
0.606
39,064,172
6,115,525
5,076,761
7,402,083
30.42%
24.38%
37.55%
11,882,774
9,525,686
14,668,416
22,694,447
64,434,939
0.606
39,064,172
2,630,097
2,230,100
3,133,745
14.34%
11.79%
17.72%
5,602,690
4,605,512
6,922,419
22,694,447
64,434,939
0.606
39,064,172
971,031
800,365
1,171,180
5.76%
4.45%
7.21%
2,250,923
1,739,506
2,817,484
22,694,447
64,434,939
0.606
39,064,172
562,239
450,127
708,437
3.38%
2.33%
4.54%
1,320,463
910,409
1,772,303
22,694,447
64,434,939
0.606
39,064,172
239,264
171,687
314,629
1.34%
0.72%
2.17%
523,741
280,097
846,639
22,694,447
64,434,939
0.606
39,064,172
28,370
11,540
51,075
0.14%
0.04%
0.32%
53,633
15,343
124,056
22,694,447
64,434,939
0.606
39,064,172
6,442
1,754
14,248
0.03%
0.01%
0.09%
12,358
2,235
34,109
22,694,447
64,434,939
0.606
39,064,172
511
73
1,478
0.00%
0.00%
0.01%
1,107
90
3,908
22,694,447
64,434,939
0.606
39,064,172
3
0
11
0.00%
0.00%
0.00%
9
0
39
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 16 of 114
December 2016

-------
C.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number of
MRs with Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All MRs Only
0.6
2,416
45,172
1.106
49,942
964
822
1,118
23.44%
16.53%
31.19%
11,709
8,254
15,577
2
2,416
45,172
1.106
49,942
469
414
534
8.14%
6.08%
10.82%
4,067
3,037
5,401
6
2,416
45,172
1.106
49,942
197
172
225
2.87%
2.15%
3.74%
1,432
1,073
1,869
10
2,416
45,172
1.106
49,942
116
97
136
1.71%
1.26%
2.26%
854
629
1,131
20
2,416
45,172
1.106
49,942
50
38
62
0.78%
0.54%
1.10%
390
268
548
60
2,416
45,172
1.106
49,942
10
6
15
0.25%
0.17%
0.34%
127
86
168
100
2,416
45,172
1.106
49,942
4
2
7
0.16%
0.08%
0.23%
79
39
117
200
2,416
45,172
1.106
49,942
1
0
3
0.06%
0.01%
0.12%
29
7
61
600
2,416
45,172
1.106
49,942
0
0
0
0.00%
0.00%
0.01%
2
0
7
MRs Only at
Surface Water
Systems
0.6
750
2,936
1.115
3,273
418
372
465
55.95%
49.01%
62.74%
1,832
1,604
2,054
2
750
2,936
1.115
3,273
231
210
256
27.92%
24.80%
31.66%
914
812
1,036
6
750
2,936
1.115
3,273
105
94
116
12.21%
10.77%
13.79%
400
353
451
10
750
2,936
1.115
3,273
63
54
72
7.77%
6.56%
9.00%
254
215
294
20
750
2,936
1.115
3,273
29
23
35
3.90%
3.08%
4.82%
128
101
158
60
750
2,936
1.115
3,273
6
4
9
0.99%
0.52%
1.53%
32
17
50
100
750
2,936
1.115
3,273
3
1
5
0.40%
0.13%
0.76%
13
4
25
200
750
2,936
1.115
3,273
1
0
2
0.08%
0.01%
0.21%
2
0
7
600
750
2,936
1.115
3,273
0
0
0
0.00%
0.00%
0.01%
0
0
0
MRs Only at
Ground Water
Systems
0.6
1,025
39,885
1.032
41,151
210
149
279
16.27%
9.71%
23.83%
6,696
3,997
9,806
2
1,025
39,885
1.032
41,151
45
30
64
3.15%
1.67%
5.23%
1,297
689
2,151
6
1,025
39,885
1.032
41,151
8
4
12
0.41%
0.13%
0.84%
170
54
347
10
1,025
39,885
1.032
41,151
3
1
5
0.13%
0.03%
0.32%
55
12
131
20
1,025
39,885
1.032
41,151
0
0
1
0.02%
0.00%
0.07%
9
1
28
60
1,025
39,885
1.032
41,151
0
0
0
0.00%
0.00%
0.00%
0
0
1
100
1,025
39,885
1.032
41,151
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1,025
39,885
1.032
41,151
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1,025
39,885
1.032
41,151
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
641
2,351
2.347
5,517
336
301
375
57.66%
48.07%
67.38%
3,181
2,652
3,718
2
641
2,351
2.347
5,517
193
173
214
33.64%
27.84%
40.12%
1,856
1,536
2,214
6
641
2,351
2.347
5,517
85
74
96
15.62%
12.07%
19.40%
862
666
1,070
10
641
2,351
2.347
5,517
50
42
59
9.87%
7.31%
12.78%
545
403
705
20
641
2,351
2.347
5,517
21
16
26
4.59%
3.02%
6.55%
253
167
361
60
641
2,351
2.347
5,517
4
2
5
1.72%
1.25%
2.12%
95
69
117
100
641
2,351
2.347
5,517
2
1
3
1.19%
0.62%
1.67%
66
34
92
200
641
2,351
2.347
5,517
1
0
1
0.48%
0.12%
0.97%
26
6
54
600
641
2,351
2.347
5,517
0
0
0
0.03%
0.00%
0.12%
2
0
7
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 17 of 114
December 2016

-------
C.l - All Disinfection Types
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
68,283,451
267,455,451
0.408
109,249,964
37,242,797
31,816,081
43,274,747
48.75%
40.59%
57.78%
53,254,927
44,349,161
63,120,395
68,283,451
267,455,451
0.408
109,249,964
21,170,570
18,766,076
24,451,783
26.34%
22.87%
31.02%
28,771,681
24,987,238
33,894,505
68,283,451
267,455,451
0.408
109,249,964
8,715,786
7,434,370
10,177,846
11.04%
9.22%
13.12%
12,066,344
10,068,630
14,333,586
68,283,451
267,455,451
0.408
109,249,964
4,745,497
3,906,314
5,774,671
6.21%
4.92%
7.73%
6,783,092
5,370,438
8,443,332
68,283,451
267,455,451
0.408
109,249,964
1,762,243
1,334,886
2,234,971
2.36%
1.66%
3.19%
2,581,327
1,809,840
3,482,360
68,283,451
267,455,451
0.408
109,249,964
216,163
112,178
375,855
0.32%
0.17%
0.55%
345,720
181,246
603,835
68,283,451
267,455,451
0.408
109,249,964
67,947
26,691
131,552
0.12%
0.05%
0.21%
127,452
53,094
233,213
68,283,451
267,455,451
0.408
109,249,964
12,541
1,896
32,427
0.03%
0.01%
0.07%
31,038
5,921
72,673
68,283,451
267,455,451
0.408
109,249,964
307
6
1,215
0.00%
0.00%
0.00%
1,346
43
5,070
45,365,720
118,756,915
0.481
57,115,043
27,154,669
23,541,616
31,088,645
58.92%
51.00%
67.47%
33,654,151
29,130,550
38,536,295
45,365,720
118,756,915
0.481
57,115,043
15,800,616
14,157,729
18,028,794
33.50%
29.86%
38.32%
19,133,596
17,052,474
21,888,838
45,365,720
118,756,915
0.481
57,115,043
6,447,609
5,577,885
7,440,459
13.99%
12.07%
16.18%
7,991,962
6,895,667
9,243,034
45,365,720
118,756,915
0.481
57,115,043
3,431,487
2,857,174
4,109,842
7.74%
6.36%
9.28%
4,420,623
3,634,936
5,303,033
45,365,720
118,756,915
0.481
57,115,043
1,233,574
929,963
1,541,703
2.95%
2.15%
3.79%
1,683,213
1,227,572
2,162,325
45,365,720
118,756,915
0.481
57,115,043
154,141
82,007
269,449
0.39%
0.20%
0.71%
225,568
114,979
405,749
45,365,720
118,756,915
0.481
57,115,043
53,342
21,920
98,388
0.14%
0.05%
0.26%
78,010
30,667
148,413
45,365,720
118,756,915
0.481
57,115,043
11,107
1,647
28,309
0.03%
0.00%
0.07%
16,043
2,420
40,929
45,365,720
118,756,915
0.481
57,115,043
273
5
1,089
0.00%
0.00%
0.00%
412
8
1,612
9,435,102
84,263,597
0.342
28,852,867
3,199,804
2,386,051
4,013,101
23.64%
16.01%
32.18%
6,821,357
4,619,874
9,286,065
9,435,102
84,263,597
0.342
28,852,867
1,392,928
1,011,814
1,942,680
8.02%
5.33%
11.92%
2,315,186
1,537,927
3,439,249
9,435,102
84,263,597
0.342
28,852,867
358,342
171,621
599,748
1.91%
0.90%
3.26%
552,287
260,673
942,024
9,435,102
84,263,597
0.342
28,852,867
133,336
44,035
289,233
0.74%
0.25%
1.56%
213,100
71,425
451,195
9,435,102
84,263,597
0.342
28,852,867
22,149
3,395
67,516
0.14%
0.02%
0.39%
39,246
6,277
112,413
9,435,102
84,263,597
0.342
28,852,867
426
11
1,659
0.00%
0.00%
0.01%
959
26
3,656
9,435,102
84,263,597
0.342
28,852,867
43
0
164
0.00%
0.00%
0.00%
109

432
9,435,102
84,263,597
0.342
28,852,867
1
0
4
0.00%
0.00%
0.00%
3
0
12
9,435,102
84,263,597
0.342
28,852,867
0
0
0
0.00%
0.00%
0.00%
0
0
0
13,482,629
64,434,939
0.361
23,282,055
6,888,324
5,888,415
8,173,001
54.89%
45.52%
65.71%
12,779,420
10,598,736
15,298,035
13,482,629
64,434,939
0.361
23,282,055
3,977,027
3,596,533
4,480,309
31.45%
27.48%
36.79%
7,322,900
6,396,837
8,566,418
13,482,629
64,434,939
0.361
23,282,055
1,909,835
1,684,864
2,137,639
15.13%
12.51%
17.82%
3,522,095
2,912,290
4,148,528
13,482,629
64,434,939
0.361
23,282,055
1,180,674
1,005,104
1,375,596
9.23%
7.15%
11.55%
2,149,369
1,664,077
2,689,104
13,482,629
64,434,939
0.361
23,282,055
506,520
401,529
625,752
3.69%
2.47%
5.19%
858,867
575,991
1,207,622
13,482,629
64,434,939
0.361
23,282,055
61,596
30,159
104,748
0.51%
0.28%
0.84%
119,194
66,241
194,431
13,482,629
64,434,939
0.361
23,282,055
14,562
4,771
33,000
0.21%
0.10%
0.36%
49,333
22,426
84,369
13,482,629
64,434,939
0.361
23,282,055
1,432
249
4,113
0.06%
0.02%
0.14%
14,992
3,501
31,732
13,482,629
64,434,939
0.361
23,282,055
34
1
126
0.00%
0.00%
0.01%
934
35
3,458
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 18 of 114
December 2016

-------
C.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
National
Number
EP Ratio
National
Number of
Number of
UCMR 2 EPs
Predicted to
have Any
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation

UCMR 2 EPs
Systems

EPS
Detects
Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)

0.6
537
31,621
1.716
54,262
99
76
125
8.53%
5.21%
12.60%
4,627
2,828
6,836

2
537
31,621
1.716
54,262
31
24
40
2.08%
1.27%
3.14%
1,126
690
1,703

6
537
31,621
1.716
54,262
8
6
10
0.38%
0.16%
0.66%
204
88
360

10
537
31,621
1.716
54,262
4
3
5
0.15%
0.06%
0.31%
79
32
168
All EPs Only
20
537
31,621
1.716
54,262
2
1
2
0.04%
0.02%
0.09%
23
12
47

60
537
31,621
1.716
54,262
1
0
1
0.01%
0.01%
0.02%
7
3
10

100
537
31,621
1.716
54,262
0
0
1
0.01%
0.00%
0.01%
3
1
7

200
537
31,621
1.716
54,262
0
0
0
0.00%
0.00%
0.00%
1
0
2

600
537
31,621
1.716
54,262
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
197
1,682
1.048
1,762
68
57
80
34.73%
28.94%
40.53%
612
510
714

2
197
1,682
1.048
1,762
24
20
28
11.98%
9.99%
14.12%
211
176
249

6
197
1,682
1.048
1,762
6
5
8
3.19%
2.60%
3.87%
56
46
68
EPs Only at Surface
Water Systems
10
197
1,682
1.048
1,762
3
3
4
1.76%
1.39%
2.18%
31
25
38
20
197
1,682
1.048
1,762
2
1
2
0.90%
0.69%
1.15%
16
12
20
60
197
1,682
1.048
1,762
1
0
1
0.37%
0.17%
0.54%
7
3
9

100
197
1,682
1.048
1,762
0
0
1
0.19%
0.04%
0.39%
3
1
7

200
197
1,682
1.048
1,762
0
0
0
0.04%
0.00%
0.14%
1
0
2

600
197
1,682
1.048
1,762
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
314
29,375
1.716
50,404
19
10
31
6.20%
3.27%
9.91%
3,127
1,650
4,995

2
314
29,375
1.716
50,404
4
2
6
1.14%
0.57%
1.96%
576
286
990

6
314
29,375
1.716
50,404
0
0
1
0.16%
0.04%
0.33%
79
18
168
EPs Only at Ground
Water Systems
10
314
29,375
1.716
50,404
0
0
0
0.05%
0.01%
0.15%
25
3
76
20
314
29,375
1.716
50,404
0
0
0
0.01%
0.00%
0.03%
4
0
17
60
314
29,375
1.716
50,404
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
314
29,375
1.716
50,404
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
314
29,375
1.716
50,404
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
314
29,375
1.716
50,404
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
26
564
3.714
2,096
11
8
14
42.35%
31.88%
53.74%
888
668
1,126

2
26
564
3.714
2,096
4
3
6
16.15%
10.87%
22.16%
338
228
464

6
26
564
3.714
2,096
1
0
2
3.29%
1.15%
5.92%
69
24
124
EPs Only at
10
26
564
3.714
2,096
0
0
1
1.08%
0.22%
2.52%
23
5
53
Mixed Water
20
26
564
3.714
2,096
0
0
0
0.14%
0.01%
0.45%
3
0
9
Systems
60
26
564
3.714
2,096
0
0
0
0.00%
0.00%
0.01%
0
0
0

100
26
564
3.714
2,096
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
26
564
3.714
2,096
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
26
564
3.714
2,096
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 19 of 114
December 2016

-------
C.2 - CL Only
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
542,851
30,431,590
0.600
18,253,101
112,178
83,681
144,466
13.28%
9.08%
18.30%
2,424,219
1,657,781
3,340,847
542,851
30,431,590
0.600
18,253,101
39,381
28,937
51,381
4.42%
2.95%
6.22%
806,974
538,028
1,135,944
542,851
30,431,590
0.600
18,253,101
11,237
7,027
16,022
1.09%
0.51%
1.85%
199,064
93,091
337,906
542,851
30,431,590
0.600
18,253,101
5,815
3,232
9,221
0.48%
0.19%
0.95%
86,889
35,530
173,580
542,851
30,431,590
0.600
18,253,101
2,050
986
3,502
0.13%
0.05%
0.27%
24,161
9,694
49,590
542,851
30,431,590
0.600
18,253,101
284
114
625
0.02%
0.01%
0.03%
2,791
1,092
6,269
542,851
30,431,590
0.600
18,253,101
108
27
223
0.01%
0.00%
0.01%
1,037
254
2,163
542,851
30,431,590
0.600
18,253,101
21
2
65
0.00%
0.00%
0.00%
205
18
622
542,851
30,431,590
0.600
18,253,101
0
0
2
0.00%
0.00%
0.00%
5
0
20
225,236
4,260,326
0.507
2,158,632
79,194
62,728
96,684
35.16%
27.85%
42.93%
758,984
601,177
926,602
225,236
4,260,326
0.507
2,158,632
28,852
22,539
35,616
12.81%
10.01%
15.81%
276,512
216,010
341,343
225,236
4,260,326
0.507
2,158,632
8,995
6,395
11,502
3.99%
2.84%
5.11%
86,210
61,287
110,236
225,236
4,260,326
0.507
2,158,632
5,051
3,119
7,133
2.24%
1.38%
3.17%
48,408
29,896
68,360
225,236
4,260,326
0.507
2,158,632
1,939
981
3,109
0.86%
0.44%
1.38%
18,583
9,397
29,795
225,236
4,260,326
0.507
2,158,632
282
114
618
0.13%
0.05%
0.27%
2,707
1,092
5,919
225,236
4,260,326
0.507
2,158,632
107
27
223
0.05%
0.01%
0.10%
1,030
254
2,134
225,236
4,260,326
0.507
2,158,632
21
2
65
0.01%
0.00%
0.03%
205
18
621
225,236
4,260,326
0.507
2,158,632
0
0
2
0.00%
0.00%
0.00%
5
0
20
290,590
24,741,799
0.596
14,737,904
18,289
9,312
30,195
6.29%
3.20%
10.39%
927,591
472,256
1,531,422
290,590
24,741,799
0.596
14,737,904
3,670
1,669
6,315
1.26%
0.57%
2.17%
186,121
84,649
320,293
290,590
24,741,799
0.596
14,737,904
602
96
1,513
0.21%
0.03%
0.52%
30,537
4,859
76,739
290,590
24,741,799
0.596
14,737,904
209
14
775
0.07%
0.00%
0.27%
10,579
699
39,281
290,590
24,741,799
0.596
14,737,904
35
1
158
0.01%
0.00%
0.05%
1,769
31
8,025
290,590
24,741,799
0.596
14,737,904
1
0
3
0.00%
0.00%
0.00%
37
0
153
290,590
24,741,799
0.596
14,737,904
0
0
0
0.00%
0.00%
0.00%
4
0
14
290,590
24,741,799
0.596
14,737,904
0
0
0
0.00%
0.00%
0.00%
0
0
0
290,590
24,741,799
0.596
14,737,904
0
0
0
0.00%
0.00%
0.00%
0
0
0
27,025
1,429,466
0.949
1,356,566
14,695
11,641
17,587
54.38%
43.08%
65.08%
737,643
584,348
882,823
27,025
1,429,466
0.949
1,356,566
6,860
4,729
9,449
25.38%
17.50%
34.96%
344,342
237,368
474,308
27,025
1,429,466
0.949
1,356,566
1,640
537
3,007
6.07%
1.99%
11.13%
82,317
26,945
150,931
27,025
1,429,466
0.949
1,356,566
556
98
1,314
2.06%
0.36%
4.86%
27,903
4,935
65,939
27,025
1,429,466
0.949
1,356,566
76
5
234
0.28%
0.02%
0.87%
3,809
266
11,770
27,025
1,429,466
0.949
1,356,566
1
0
4
0.00%
0.00%
0.01%
47

197
27,025
1,429,466
0.949
1,356,566
0
0
0
0.00%
0.00%
0.00%
4
0
16
27,025
1,429,466
0.949
1,356,566
0
0
0
0.00%
0.00%
0.00%
0
0
0
27,025
1,429,466
0.949
1,356,566
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 20 of 114
December 2016

-------
C.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All MRs Only
0.6
428
31,621
1.209
38,234
136
111
161
17.30%
12.10%
22.89%
6,615
4,625
8,751
2
428
31,621
1.209
38,234
43
35
52
3.84%
2.47%
5.31%
1,467
944
2,029
6
428
31,621
1.209
38,234
9
7
12
0.51%
0.26%
0.86%
196
98
330
10
428
31,621
1.209
38,234
4
3
6
0.17%
0.08%
0.30%
64
32
116
20
428
31,621
1.209
38,234
2
1
2
0.04%
0.03%
0.07%
17
11
27
60
428
31,621
1.209
38,234
1
0
1
0.01%
0.01%
0.02%
6
2
9
100
428
31,621
1.209
38,234
0
0
1
0.01%
0.00%
0.02%
3
0
6
200
428
31,621
1.209
38,234
0
0
0
0.00%
0.00%
0.00%
0
0
2
600
428
31,621
1.209
38,234
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
191
1,682
1.016
1,709
95
83
106
49.56%
43.25%
55.74%
847
739
952
2
191
1,682
1.016
1,709
33
29
38
17.33%
15.03%
19.96%
296
257
341
6
191
1,682
1.016
1,709
8
7
9
4.13%
3.45%
4.88%
71
59
83
10
191
1,682
1.016
1,709
4
3
5
2.02%
1.56%
2.54%
34
27
43
20
191
1,682
1.016
1,709
2
1
2
0.84%
0.63%
1.11%
14
11
19
60
191
1,682
1.016
1,709
1
0
1
0.33%
0.13%
0.51%
6
2
9
100
191
1,682
1.016
1,709
0
0
1
0.15%
0.03%
0.36%
3
0
6
200
191
1,682
1.016
1,709
0
0
0
0.03%
0.00%
0.10%
0
0
2
600
191
1,682
1.016
1,709
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Ground Water
Systems
0.6
218
29,375
1.191
34,994
31
20
42
14.14%
9.29%
19.33%
4,948
3,252
6,765
2
218
29,375
1.191
34,994
5
3
7
2.30%
1.26%
3.43%
805
440
1,199
6
218
29,375
1.191
34,994
0
0
1
0.17%
0.04%
0.35%
59
16
123
10
218
29,375
1.191
34,994
0
0
0
0.03%
0.01%
0.09%
12
2
30
20
218
29,375
1.191
34,994
0
0
0
0.00%
0.00%
0.01%
1
0
3
60
218
29,375
1.191
34,994
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
218
29,375
1.191
34,994
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
218
29,375
1.191
34,994
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
218
29,375
1.191
34,994
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
19
564
2.714
1,532
10
8
13
53.55%
41.36%
67.44%
820
633
1,033
2
19
564
2.714
1,532
5
3
6
23.86%
16.08%
31.97%
365
246
490
6
19
564
2.714
1,532
1
0
2
4.29%
1.53%
8.08%
66
23
124
10
19
564
2.714
1,532
0
0
1
1.19%
0.26%
2.78%
18
4
43
20
19
564
2.714
1,532
0
0
0
0.12%
0.01%
0.37%
2
0
6
60
19
564
2.714
1,532
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
19
564
2.714
1,532
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
19
564
2.714
1,532
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
19
564
2.714
1,532
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 21 of 114
December 2016

-------
C.2 - CL Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population
Served by MRs Predicted to have Any
Detects Exceeding Threshold -
National Extrapolation
Total Population
Served by MRs
with Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Population Served by MRs
with Any Detects Exceeding Threshold
- National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
435,573
30,431,590
0.426
12,977,665
147,682
118,232
180,649
22.64%
16.12%
30.03%
2,937,845
2,092,061
3,897,153
435,573
30,431,590
0.426
12,977,665
47,284
36,954
59,790
6.31%
4.35%
8.77%
819,030
564,221
1,138,440
435,573
30,431,590
0.426
12,977,665
11,156
8,077
14,902
1.21%
0.72%
1.92%
157,184
92,980
248,906
435,573
30,431,590
0.426
12,977,665
4,929
3,017
7,487
0.46%
0.24%
0.81%
60,333
31,296
105,643
435,573
30,431,590
0.426
12,977,665
1,276
584
2,274
0.10%
0.04%
0.20%
13,485
5,703
25,764
435,573
30,431,590
0.426
12,977,665
174
70
281
0.01%
0.01%
0.02%
1,678
668
2,723
435,573
30,431,590
0.426
12,977,665
71
14
161
0.01%
0.00%
0.01%
680
131
1,543
435,573
30,431,590
0.426
12,977,665
12
1
43
0.00%
0.00%
0.00%
112
6
414
435,573
30,431,590
0.426
12,977,665
0
0
1
0.00%
0.00%
0.00%
1
0
6
221,343
4,260,326
0.498
2,121,317
110,542
94,823
127,834
49.94%
42.84%
57.75%
1,059,416
908,770
1,225,142
221,343
4,260,326
0.498
2,121,317
38,327
31,803
45,960
17.32%
14.37%
20.76%
367,317
304,791
440,470
221,343
4,260,326
0.498
2,121,317
9,921
7,694
12,297
4.48%
3.48%
5.56%
95,086
73,740
117,856
221,343
4,260,326
0.498
2,121,317
4,607
2,958
6,654
2.08%
1.34%
3.01%
44,155
28,351
63,775
221,343
4,260,326
0.498
2,121,317
1,245
582
2,176
0.56%
0.26%
0.98%
11,933
5,578
20,856
221,343
4,260,326
0.498
2,121,317
174
70
280
0.08%
0.03%
0.13%
1,666
668
2,681
221,343
4,260,326
0.498
2,121,317
71
14
161
0.03%
0.01%
0.07%
679
131
1,541
221,343
4,260,326
0.498
2,121,317
12
1
43
0.01%
0.00%
0.02%
112
6
414
221,343
4,260,326
0.498
2,121,317
0
0
1
0.00%
0.00%
0.00%
1
0
6
197,248
24,741,799
0.404
10,003,896
27,122
15,799
40,067
13.75%
8.01%
20.31%
1,375,550
801,302
2,032,112
197,248
24,741,799
0.404
10,003,896
3,984
1,632
7,196
2.02%
0.83%
3.65%
202,057
82,746
364,977
197,248
24,741,799
0.404
10,003,896
248
59
626
0.13%
0.03%
0.32%
12,592
2,995
31,729
197,248
24,741,799
0.404
10,003,896
45
6
133
0.02%
0.00%
0.07%
2,268
319
6,728
197,248
24,741,799
0.404
10,003,896
3
0
11
0.00%
0.00%
0.01%
138
7
563
197,248
24,741,799
0.404
10,003,896
0
0
0
0.00%
0.00%
0.00%
1
0
2
197,248
24,741,799
0.404
10,003,896
0
0
0
0.00%
0.00%
0.00%
0
0
0
197,248
24,741,799
0.404
10,003,896
0
0
0
0.00%
0.00%
0.00%
0
0
0
197,248
24,741,799
0.404
10,003,896
0
0
0
0.00%
0.00%
0.00%
0
0
0
16,982
1,429,466
0.596
852,452
10,018
7,610
12,748
58.99%
44.81%
75.07%
502,879
381,989
639,900
16,982
1,429,466
0.596
852,452
4,973
3,520
6,634
29.29%
20.73%
39.06%
249,656
176,685
332,993
16,982
1,429,466
0.596
852,452
986
324
1,979
5.81%
1.91%
11.65%
49,506
16,244
99,322
16,982
1,429,466
0.596
852,452
277
52
700
1.63%
0.31%
4.12%
13,910
2,626
35,140
16,982
1,429,466
0.596
852,452
28
2
87
0.17%
0.01%
0.51%
1,414
118
4,344
16,982
1,429,466
0.596
852,452
0
0
1
0.00%
0.00%
0.00%
11
0
40
16,982
1,429,466
0.596
852,452
0
0
0
0.00%
0.00%
0.00%
1
0
2
16,982
1,429,466
0.596
852,452
0
0
0
0.00%
0.00%
0.00%
0
0
0
16,982
1,429,466
0.596
852,452
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 22 of 114
December 2016

-------
C.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
National
Number
EP Ratio
National
Number of
Number of
UCMR 2 EPs
Predicted to
have Any
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation

UCMR 2 EPs
Systems

EPS
Detects
Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)

0.6
950
2,081
4.601
9,574
131
102
166
16.89%
13.42%
20.95%
1,617
1,285
2,006

2
950
2,081
4.601
9,574
46
38
56
6.76%
5.69%
8.00%
648
545
766

6
950
2,081
4.601
9,574
13
10
17
2.09%
1.60%
2.63%
200
153
252

10
950
2,081
4.601
9,574
6
4
9
1.03%
0.70%
1.38%
99
67
132
All EPs Only
20
950
2,081
4.601
9,574
2
1
4
0.31%
0.15%
0.51%
30
14
49

60
950
2,081
4.601
9,574
0
0
1
0.03%
0.00%
0.07%
2
0
7

100
950
2,081
4.601
9,574
0
0
0
0.01%
0.00%
0.02%
1
0
2

200
950
2,081
4.601
9,574
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
950
2,081
4.601
9,574
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
104
519
1.224
634
30
23
38
29.05%
22.51%
36.18%
184
143
230

2
104
519
1.224
634
10
8
13
9.82%
7.62%
12.32%
62
48
78

6
104
519
1.224
634
2
1
3
1.94%
1.09%
2.90%
12
7
18
EPs Only at Surface
Water Systems
10
104
519
1.224
634
1
0
1
0.64%
0.26%
1.14%
4
2
7
20
104
519
1.224
634
0
0
0
0.09%
0.02%
0.21%
1
0
1
60
104
519
1.224
634
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
104
519
1.224
634
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
104
519
1.224
634
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
104
519
1.224
634
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
679
1,027
5.223
5,365
54
40
72
8.00%
5.84%
10.56%
429
313
567

2
679
1,027
5.223
5,365
14
11
18
2.07%
1.60%
2.68%
111
86
144

6
679
1,027
5.223
5,365
4
3
5
0.55%
0.42%
0.70%
29
22
38
EPs Only at Ground
Water Systems
10
679
1,027
5.223
5,365
2
2
3
0.33%
0.23%
0.42%
18
13
22
20
679
1,027
5.223
5,365
1
1
2
0.17%
0.08%
0.26%
9
4
14
60
679
1,027
5.223
5,365
0
0
1
0.03%
0.00%
0.08%
2
0
4

100
679
1,027
5.223
5,365
0
0
0
0.01%
0.00%
0.03%
0
0
2

200
679
1,027
5.223
5,365
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
679
1,027
5.223
5,365
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
167
535
6.680
3,574
47
39
56
28.09%
23.19%
33.83%
1,004
829
1,209

2
167
535
6.680
3,574
22
19
25
13.26%
11.49%
15.23%
474
411
544

6
167
535
6.680
3,574
7
6
9
4.43%
3.46%
5.48%
158
124
196
EPs Only at
10
167
535
6.680
3,574
4
2
5
2.15%
1.48%
2.87%
77
53
103
Mixed Water
20
167
535
6.680
3,574
1
0
2
0.57%
0.27%
0.94%
21
10
34
Systems
60
167
535
6.680
3,574
0
0
0
0.02%
0.00%
0.07%
1
0
3

100
167
535
6.680
3,574
0
0
0
0.00%
0.00%
0.01%
0
0
0

200
167
535
6.680
3,574
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
167
535
6.680
3,574
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 23 of 114
December 2016

-------
C.2 - CL Only
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
6,240,406
61,835,442
0.633
39,146,542
997,235
751,984
1,279,504
17.23%
13.01%
22.22%
6,746,425
5,091,850
8,699,534
6,240,406
61,835,442
0.633
39,146,542
331,207
252,491
432,462
6.12%
4.81%
7.87%
2,394,859
1,882,395
3,079,997
6,240,406
61,835,442
0.633
39,146,542
85,082
57,260
115,337
1.86%
1.36%
2.40%
729,178
531,280
941,107
6,240,406
61,835,442
0.633
39,146,542
39,848
23,629
60,123
0.94%
0.60%
1.35%
369,359
233,073
527,922
6,240,406
61,835,442
0.633
39,146,542
12,337
5,092
21,749
0.29%
0.12%
0.51%
113,665
47,399
198,721
6,240,406
61,835,442
0.633
39,146,542
1,200
150
3,372
0.02%
0.00%
0.06%
8,313
1,052
23,883
6,240,406
61,835,442
0.633
39,146,542
309
17
1,051
0.00%
0.00%
0.02%
1,866
106
6,421
6,240,406
61,835,442
0.633
39,146,542
35
0
136
0.00%
0.00%
0.00%
190
3
730
6,240,406
61,835,442
0.633
39,146,542
1
0
1
0.00%
0.00%
0.00%
3
0
6
1,755,067
17,345,917
0.516
8,956,690
545,489
430,741
674,575
31.08%
24.54%
38.44%
2,783,812
2,198,214
3,442,581
1,755,067
17,345,917
0.516
8,956,690
190,684
142,500
250,927
10.86%
8.12%
14.30%
973,125
727,225
1,280,562
1,755,067
17,345,917
0.516
8,956,690
37,444
19,545
56,507
2.13%
1.11%
3.22%
191,090
99,743
288,372
1,755,067
17,345,917
0.516
8,956,690
12,270
4,467
23,781
0.70%
0.25%
1.35%
62,618
22,798
121,361
1,755,067
17,345,917
0.516
8,956,690
1,676
291
4,515
0.10%
0.02%
0.26%
8,551
1,483
23,040
1,755,067
17,345,917
0.516
8,956,690
22
1
83
0.00%
0.00%
0.00%
115
4
423
1,755,067
17,345,917
0.516
8,956,690
2
0
7
0.00%
0.00%
0.00%
10
0
38
1,755,067
17,345,917
0.516
8,956,690
0
0
0
0.00%
0.00%
0.00%
0
0
1
1,755,067
17,345,917
0.516
8,956,690
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,680,719
26,592,179
0.687
18,266,499
277,158
189,404
376,147
7.53%
5.15%
10.22%
1,375,467
939,965
1,866,725
3,680,719
26,592,179
0.687
18,266,499
67,028
48,168
90,370
1.82%
1.31%
2.46%
332,645
239,046
448,482
3,680,719
26,592,179
0.687
18,266,499
17,029
12,922
22,225
0.46%
0.35%
0.60%
84,509
64,128
110,298
3,680,719
26,592,179
0.687
18,266,499
10,341
7,476
13,390
0.28%
0.20%
0.36%
51,320
37,100
66,453
3,680,719
26,592,179
0.687
18,266,499
5,365
2,561
8,087
0.15%
0.07%
0.22%
26,627
12,707
40,136
3,680,719
26,592,179
0.687
18,266,499
939
119
2,565
0.03%
0.00%
0.07%
4,660
588
12,729
3,680,719
26,592,179
0.687
18,266,499
273
15
921
0.01%
0.00%
0.03%
1,354
74
4,570
3,680,719
26,592,179
0.687
18,266,499
34
0
130
0.00%
0.00%
0.00%
168
2
644
3,680,719
26,592,179
0.687
18,266,499
1
0
1
0.00%
0.00%
0.00%
3
0
6
804,620
17,897,346
0.666
11,923,353
174,588
131,839
228,782
21.70%
16.39%
28.43%
2,587,147
1,953,671
3,390,228
804,620
17,897,346
0.666
11,923,353
73,495
61,822
91,166
9.13%
7.68%
11.33%
1,089,089
916,123
1,350,953
804,620
17,897,346
0.666
11,923,353
30,609
24,794
36,605
3.80%
3.08%
4.55%
453,579
367,409
542,437
804,620
17,897,346
0.666
11,923,353
17,236
11,686
22,951
2.14%
1.45%
2.85%
255,421
173,176
340,108
804,620
17,897,346
0.666
11,923,353
5,297
2,241
9,147
0.66%
0.28%
1.14%
78,487
33,209
135,545
804,620
17,897,346
0.666
11,923,353
239
31
724
0.03%
0.00%
0.09%
3,538
460
10,731
804,620
17,897,346
0.666
11,923,353
34
2
122
0.00%
0.00%
0.02%
502
32
1,813
804,620
17,897,346
0.666
11,923,353
1
0
6
0.00%
0.00%
0.00%
22
0
85
804,620
17,897,346
0.666
11,923,353
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 24 of 114
December 2016

-------
C.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
All MRs Only
0.6
438
2,081
2.023
4,211
117
92
144
31.68%
25.38%
38.39%
1,334
1,069
1,616
2
438
2,081
2.023
4,211
37
30
46
11.58%
9.48%
13.87%
488
399
584
6
438
2,081
2.023
4,211
10
8
13
3.59%
2.83%
4.43%
151
119
186
10
438
2,081
2.023
4,211
5
3
7
1.86%
1.30%
2.45%
78
55
103
20
438
2,081
2.023
4,211
1
1
2
0.54%
0.24%
0.89%
23
10
37
60
438
2,081
2.023
4,211
0
0
0
0.02%
0.00%
0.05%
1
0
2
100
438
2,081
2.023
4,211
0
0
0
0.00%
0.00%
0.01%
0
0
0
200
438
2,081
2.023
4,211
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
438
2,081
2.023
4,211
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
101
519
1.188
616
41
34
49
40.93%
33.19%
48.91%
252
205
301
2
101
519
1.188
616
13
11
16
13.08%
10.48%
16.02%
81
65
99
6
101
519
1.188
616
3
2
4
3.36%
2.45%
4.36%
21
15
27
10
101
519
1.188
616
1
1
2
1.40%
0.76%
2.12%
9
5
13
20
101
519
1.188
616
0
0
1
0.26%
0.07%
0.60%
2
0
4
60
101
519
1.188
616
0
0
0
0.00%
0.00%
0.02%
0
0
0
100
101
519
1.188
616
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
101
519
1.188
616
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
101
519
1.188
616
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Ground Water
Systems
0.6
268
1,027
2.062
2,118
40
29
53
15.02%
10.65%
19.85%
318
226
420
2
268
1,027
2.062
2,118
8
6
11
3.11%
2.16%
4.21%
66
46
89
6
268
1,027
2.062
2,118
1
0
2
0.38%
0.18%
0.63%
8
4
13
10
268
1,027
2.062
2,118
0
0
1
0.10%
0.03%
0.21%
2
1
4
20
268
1,027
2.062
2,118
0
0
0
0.01%
0.00%
0.03%
0
0
1
60
268
1,027
2.062
2,118
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
268
1,027
2.062
2,118
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
268
1,027
2.062
2,118
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
268
1,027
2.062
2,118
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
69
535
2.760
1,477
36
30
42
51.71%
43.23%
60.58%
764
638
895
2
69
535
2.760
1,477
16
14
19
23.09%
19.57%
26.82%
341
289
396
6
69
535
2.760
1,477
6
5
7
8.30%
6.78%
9.89%
123
100
146
10
69
535
2.760
1,477
3
2
4
4.57%
3.34%
5.80%
68
49
86
20
69
535
2.760
1,477
1
0
2
1.41%
0.66%
2.23%
21
10
33
60
69
535
2.760
1,477
0
0
0
0.05%
0.01%
0.15%
1
0
2
100
69
535
2.760
1,477
0
0
0
0.01%
0.00%
0.02%
0
0
0
200
69
535
2.760
1,477
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
69
535
2.760
1,477
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 25 of 114
December 2016

-------
C.2 - CL Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population
Served by MRs Predicted to have Any
Detects Exceeding Threshold -
National Extrapolation
Total Population
Served by MRs
with Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Population Served by MRs
with Any Detects Exceeding Threshold
- National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
3,848,394
61,835,442
0.382
23,624,096
1,166,585
892,756
1,470,809
33.61%
25.72%
42.31%
7,939,062
6,075,169
9,994,759
3,848,394
61,835,442
0.382
23,624,096
365,708
281,546
466,206
11.48%
9.03%
14.48%
2,713,080
2,133,316
3,420,644
3,848,394
61,835,442
0.382
23,624,096
102,811
74,513
138,233
3.65%
2.79%
4.66%
862,255
658,841
1,102,050
3,848,394
61,835,442
0.382
23,624,096
49,168
28,378
72,440
1.88%
1.21%
2.60%
444,323
285,891
615,271
3,848,394
61,835,442
0.382
23,624,096
12,089
4,201
24,442
0.52%
0.21%
0.94%
122,457
49,938
221,461
3,848,394
61,835,442
0.382
23,624,096
351
38
1,072
0.02%
0.00%
0.05%
4,140
517
11,806
3,848,394
61,835,442
0.382
23,624,096
38
2
133
0.00%
0.00%
0.01%
466
30
1,572
3,848,394
61,835,442
0.382
23,624,096
1
0
4
0.00%
0.00%
0.00%
13
0
47
3,848,394
61,835,442
0.382
23,624,096
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,707,695
17,345,917
0.502
8,714,935
710,123
572,120
867,202
41.58%
33.50%
50.78%
3,623,992
2,919,717
4,425,620
1,707,695
17,345,917
0.502
8,714,935
231,951
185,410
289,182
13.58%
10.86%
16.93%
1,183,724
946,210
1,475,789
1,707,695
17,345,917
0.502
8,714,935
63,487
44,209
87,572
3.72%
2.59%
5.13%
323,996
225,615
446,909
1,707,695
17,345,917
0.502
8,714,935
28,199
13,601
44,539
1.65%
0.80%
2.61%
143,908
69,412
227,298
1,707,695
17,345,917
0.502
8,714,935
5,745
1,259
14,210
0.34%
0.07%
0.83%
29,320
6,424
72,520
1,707,695
17,345,917
0.502
8,714,935
109
5
419
0.01%
0.00%
0.02%
556
24
2,138
1,707,695
17,345,917
0.502
8,714,935
9
0
41
0.00%
0.00%
0.00%
47
1
208
1,707,695
17,345,917
0.502
8,714,935
0
0
1
0.00%
0.00%
0.00%
1
0
4
1,707,695
17,345,917
0.502
8,714,935
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,705,892
26,592,179
0.318
8,465,918
248,489
161,927
342,485
14.57%
9.49%
20.08%
1,233,190
803,605
1,699,670
1,705,892
26,592,179
0.318
8,465,918
45,936
24,096
68,832
2.69%
1.41%
4.03%
227,968
119,583
341,597
1,705,892
26,592,179
0.318
8,465,918
4,511
1,606
9,699
0.26%
0.09%
0.57%
22,389
7,972
48,134
1,705,892
26,592,179
0.318
8,465,918
1,047
253
2,585
0.06%
0.01%
0.15%
5,194
1,257
12,829
1,705,892
26,592,179
0.318
8,465,918
89
9
271
0.01%
0.00%
0.02%
440
46
1,345
1,705,892
26,592,179
0.318
8,465,918
1
0
2
0.00%
0.00%
0.00%
3
0
8
1,705,892
26,592,179
0.318
8,465,918
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,705,892
26,592,179
0.318
8,465,918
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,705,892
26,592,179
0.318
8,465,918
0
0
0
0.00%
0.00%
0.00%
0
0
0
434,807
17,897,346
0.360
6,443,242
207,974
158,709
261,122
47.83%
36.50%
60.05%
3,081,880
2,351,848
3,869,469
434,807
17,897,346
0.360
6,443,242
87,821
72,039
108,192
20.20%
16.57%
24.88%
1,301,389
1,067,523
1,603,257
434,807
17,897,346
0.360
6,443,242
34,812
28,697
40,962
8.01%
6.60%
9.42%
515,870
425,254
607,007
434,807
17,897,346
0.360
6,443,242
19,922
14,524
25,316
4.58%
3.34%
5.82%
295,222
215,223
375,144
434,807
17,897,346
0.360
6,443,242
6,255
2,933
9,960
1.44%
0.67%
2.29%
92,697
43,468
147,595
434,807
17,897,346
0.360
6,443,242
242
33
652
0.06%
0.01%
0.15%
3,581
493
9,661
434,807
17,897,346
0.360
6,443,242
28
2
92
0.01%
0.00%
0.02%
418
29
1,364
434,807
17,897,346
0.360
6,443,242
1
0
3
0.00%
0.00%
0.00%
12
0
43
434,807
17,897,346
0.360
6,443,242
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 26 of 114
December 2016

-------
C.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All EPs Only
0.6
2,243
207
10.836
2,243
308
245
375
13.73%
10.94%
16.70%
308
245
375
2
2,243
207
10.836
2,243
71
58
85
3.15%
2.58%
3.78%
71
58
85
6
2,243
207
10.836
2,243
16
12
20
0.71%
0.56%
0.87%
16
12
20
10
2,243
207
10.836
2,243
8
5
10
0.34%
0.24%
0.46%
8
5
10
20
2,243
207
10.836
2,243
2
1
4
0.11%
0.06%
0.17%
2
1
4
60
2,243
207
10.836
2,243
0
0
1
0.01%
0.00%
0.03%
0
0
1
100
2,243
207
10.836
2,243
0
0
0
0.00%
0.00%
0.01%
0
0
0
200
2,243
207
10.836
2,243
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
2,243
207
10.836
2,243
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
225
110
2.045
225
45
35
55
19.85%
15.61%
24.40%
45
35
55
2
225
110
2.045
225
14
11
17
6.17%
4.96%
7.57%
14
11
17
6
225
110
2.045
225
4
3
5
1.79%
1.36%
2.25%
4
3
5
10
225
110
2.045
225
2
2
3
0.99%
0.72%
1.32%
2
2
3
20
225
110
2.045
225
1
1
1
0.45%
0.24%
0.63%
1
1
1
60
225
110
2.045
225
0
0
0
0.07%
0.01%
0.20%
0
0
0
100
225
110
2.045
225
0
0
0
0.02%
0.00%
0.06%
0
0
0
200
225
110
2.045
225
0
0
0
0.00%
0.00%
0.01%
0
0
0
600
225
110
2.045
225
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
942
45
20.933
942
118
92
146
12.52%
9.72%
15.48%
118
92
146
2
942
45
20.933
942
18
13
23
1.92%
1.42%
2.44%
18
13
23
6
942
45
20.933
942
2
1
3
0.18%
0.10%
0.27%
2
1
3
10
942
45
20.933
942
0
0
1
0.05%
0.02%
0.10%
0
0
1
20
942
45
20.933
942
0
0
0
0.01%
0.00%
0.02%
0
0
0
60
942
45
20.933
942
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
942
45
20.933
942
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
942
45
20.933
942
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
942
45
20.933
942
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
1,076
52
20.692
1,076
145
119
174
13.51%
11.02%
16.15%
145
119
174
2
1,076
52
20.692
1,076
39
33
45
3.59%
3.11%
4.16%
39
33
45
6
1,076
52
20.692
1,076
10
8
12
0.95%
0.78%
1.11%
10
8
12
10
1,076
52
20.692
1,076
5
4
6
0.46%
0.34%
0.59%
5
4
6
20
1,076
52
20.692
1,076
1
1
2
0.13%
0.07%
0.20%
1
1
2
60
1,076
52
20.692
1,076
0
0
0
0.01%
0.00%
0.02%
0
0
0
100
1,076
52
20.692
1,076
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1,076
52
20.692
1,076
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1,076
52
20.692
1,076
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 27 of 114
December 2016

-------
C.2 - CL Only
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
46,685,528
70,477,886
0.662
46,685,528
8,072,910
6,018,066
10,804,675
17.29%
12.89%
23.14%
8,072,910
6,018,066
10,804,675
46,685,528
70,477,886
0.662
46,685,528
2,379,101
1,804,357
3,125,317
5.10%
3.86%
6.69%
2,379,101
1,804,357
3,125,317
46,685,528
70,477,886
0.662
46,685,528
528,449
335,064
764,169
1.13%
0.72%
1.64%
528,449
335,064
764,169
46,685,528
70,477,886
0.662
46,685,528
219,355
124,705
370,906
0.47%
0.27%
0.79%
219,355
124,705
370,906
46,685,528
70,477,886
0.662
46,685,528
58,917
30,840
98,334
0.13%
0.07%
0.21%
58,917
30,840
98,334
46,685,528
70,477,886
0.662
46,685,528
5,778
800
15,311
0.01%
0.00%
0.03%
5,778
800
15,311
46,685,528
70,477,886
0.662
46,685,528
1,368
82
4,593
0.00%
0.00%
0.01%
1,368
82
4,593
46,685,528
70,477,886
0.662
46,685,528
114
2
426
0.00%
0.00%
0.00%
114
2
426
46,685,528
70,477,886
0.662
46,685,528
1
0
2
0.00%
0.00%
0.00%
1
0
2
23,764,773
41,269,868
0.576
23,764,773
5,282,470
3,911,834
7,122,060
22.23%
16.46%
29.97%
5,282,470
3,911,834
7,122,060
23,764,773
41,269,868
0.576
23,764,773
1,710,402
1,290,340
2,231,522
7.20%
5.43%
9.39%
1,710,402
1,290,340
2,231,522
23,764,773
41,269,868
0.576
23,764,773
394,777
235,178
589,271
1.66%
0.99%
2.48%
394,777
235,178
589,271
23,764,773
41,269,868
0.576
23,764,773
162,504
84,589
290,003
0.68%
0.36%
1.22%
162,504
84,589
290,003
23,764,773
41,269,868
0.576
23,764,773
45,378
23,590
75,632
0.19%
0.10%
0.32%
45,378
23,590
75,632
23,764,773
41,269,868
0.576
23,764,773
5,223
674
13,904
0.02%
0.00%
0.06%
5,223
674
13,904
23,764,773
41,269,868
0.576
23,764,773
1,283
72
4,328
0.01%
0.00%
0.02%
1,283
72
4,328
23,764,773
41,269,868
0.576
23,764,773
109
2
409
0.00%
0.00%
0.00%
109
2
409
23,764,773
41,269,868
0.576
23,764,773
1
0
2
0.00%
0.00%
0.00%
1
0
2
7,983,907
11,230,816
0.711
7,983,907
614,704
420,135
833,079
7.70%
5.26%
10.43%
614,704
420,135
833,079
7,983,907
11,230,816
0.711
7,983,907
98,758
63,720
142,086
1.24%
0.80%
1.78%
98,758
63,720
142,086
7,983,907
11,230,816
0.711
7,983,907
9,138
4,398
16,541
0.11%
0.06%
0.21%
9,138
4,398
16,541
7,983,907
11,230,816
0.711
7,983,907
2,354
826
5,214
0.03%
0.01%
0.07%
2,354
826
5,214
7,983,907
11,230,816
0.711
7,983,907
289
47
899
0.00%
0.00%
0.01%
289
47
899
7,983,907
11,230,816
0.711
7,983,907
5
0
24
0.00%
0.00%
0.00%
5
0
24
7,983,907
11,230,816
0.711
7,983,907
1
0
2
0.00%
0.00%
0.00%
1
0
2
7,983,907
11,230,816
0.711
7,983,907
0
0
0
0.00%
0.00%
0.00%
0
0
0
7,983,907
11,230,816
0.711
7,983,907
0
0
0
0.00%
0.00%
0.00%
0
0
0
14,936,848
17,977,203
0.831
14,936,848
2,175,736
1,686,097
2,849,536
14.57%
11.29%
19.08%
2,175,736
1,686,097
2,849,536
14,936,848
17,977,203
0.831
14,936,848
569,941
450,296
751,709
3.82%
3.01%
5.03%
569,941
450,296
751,709
14,936,848
17,977,203
0.831
14,936,848
124,535
95,488
158,357
0.83%
0.64%
1.06%
124,535
95,488
158,357
14,936,848
17,977,203
0.831
14,936,848
54,497
39,291
75,689
0.36%
0.26%
0.51%
54,497
39,291
75,689
14,936,848
17,977,203
0.831
14,936,848
13,250
7,204
21,803
0.09%
0.05%
0.15%
13,250
7,204
21,803
14,936,848
17,977,203
0.831
14,936,848
549
126
1,384
0.00%
0.00%
0.01%
549
126
1,384
14,936,848
17,977,203
0.831
14,936,848
84
10
263
0.00%
0.00%
0.00%
84
10
263
14,936,848
17,977,203
0.831
14,936,848
5
0
17
0.00%
0.00%
0.00%
5
0
17
14,936,848
17,977,203
0.831
14,936,848
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 28 of 114
December 2016

-------
C.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
National
Number
MR Ratio
National
Number of
Number of
UCMR 2 MRs
Predicted to
have Any
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation

UCMR 2 MRs
Systems

MRs
Detects
Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
987
207
4.768
987
275
225
331
27.82%
22.80%
33.59%
275
225
331

2
987
207
4.768
987
84
73
97
8.47%
7.39%
9.79%
84
73
97

6
987
207
4.768
987
35
32
38
3.56%
3.27%
3.88%
35
32
38

10
987
207
4.768
987
23
21
26
2.36%
2.11%
2.62%
23
21
26
All MRs Only
20
987
207
4.768
987
10
8
13
1.05%
0.84%
1.28%
10
8
13

60
987
207
4.768
987
1
0
2
0.10%
0.05%
0.18%
1
0
2

100
987
207
4.768
987
0
0
0
0.02%
0.01%
0.05%
0
0
0

200
987
207
4.768
987
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
987
207
4.768
987
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
210
110
1.909
210
67
55
81
31.84%
26.17%
38.67%
67
55
81

2
210
110
1.909
210
18
15
22
8.65%
7.13%
10.58%
18
15
22

6
210
110
1.909
210
5
4
6
2.24%
1.82%
2.69%
5
4
6
MRs Only at
10
210
110
1.909
210
3
2
3
1.26%
1.00%
1.55%
3
2
3
Surface Water
20
210
110
1.909
210
1
1
2
0.60%
0.35%
0.85%
1
1
2
Systems
60
210
110
1.909
210
0
0
0
0.08%
0.01%
0.21%
0
0
0

100
210
110
1.909
210
0
0
0
0.02%
0.00%
0.06%
0
0
0

200
210
110
1.909
210
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
210
110
1.909
210
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
448
45
9.956
448
90
66
115
20.08%
14.73%
25.61%
90
66
115

2
448
45
9.956
448
10
6
14
2.19%
1.34%
3.22%
10
6
14

6
448
45
9.956
448
0
0
1
0.09%
0.04%
0.17%
0
0
1
MRs Only at
10
448
45
9.956
448
0
0
0
0.01%
0.00%
0.03%
0
0
0
Ground Water
20
448
45
9.956
448
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
448
45
9.956
448
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
448
45
9.956
448
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
448
45
9.956
448
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
448
45
9.956
448
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
329
52
6.327
329
118
104
136
35.78%
31.64%
41.20%
118
104
136

2
329
52
6.327
329
56
52
60
16.92%
15.80%
18.23%
56
52
60

6
329
52
6.327
329
30
28
32
9.13%
8.60%
9.68%
30
28
32
MRs Only at
10
329
52
6.327
329
21
19
22
6.27%
5.68%
6.82%
21
19
22
Mixed Water
20
329
52
6.327
329
9
8
11
2.78%
2.28%
3.31%
9
8
11
Systems
60
329
52
6.327
329
1
0
1
0.26%
0.14%
0.41%
1
0
1

100
329
52
6.327
329
0
0
0
0.05%
0.02%
0.11%
0
0
0

200
329
52
6.327
329
0
0
0
0.00%
0.00%
0.01%
0
0
0

600
329
52
6.327
329
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 29 of 114
December 2016

-------
C.2 - CL Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population
Served by MRs Predicted to have Any
Detects Exceeding Threshold -
National Extrapolation
Total Population
Served by MRs
with Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Population Served by MRs
with Any Detects Exceeding Threshold
- National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
35,475,847
70,477,886
0.503
35,475,847
11,652,401
9,010,655
14,850,668
32.85%
25.40%
41.86%
11,652,401
9,010,655
14,850,668
35,475,847
70,477,886
0.503
35,475,847
4,015,453
3,355,384
4,956,010
11.32%
9.46%
13.97%
4,015,453
3,355,384
4,956,010
35,475,847
70,477,886
0.503
35,475,847
1,446,687
1,188,303
1,736,116
4.08%
3.35%
4.89%
1,446,687
1,188,303
1,736,116
35,475,847
70,477,886
0.503
35,475,847
856,534
705,910
1,048,896
2.41%
1.99%
2.96%
856,534
705,910
1,048,896
35,475,847
70,477,886
0.503
35,475,847
368,283
284,924
454,053
1.04%
0.80%
1.28%
368,283
284,924
454,053
35,475,847
70,477,886
0.503
35,475,847
41,799
15,970
82,533
0.12%
0.05%
0.23%
41,799
15,970
82,533
35,475,847
70,477,886
0.503
35,475,847
8,781
2,111
23,022
0.02%
0.01%
0.06%
8,781
2,111
23,022
35,475,847
70,477,886
0.503
35,475,847
581
61
1,874
0.00%
0.00%
0.01%
581
61
1,874
35,475,847
70,477,886
0.503
35,475,847
2
0
7
0.00%
0.00%
0.00%
2
0
7
22,489,454
41,269,868
0.545
22,489,454
8,059,057
6,248,838
10,091,432
35.83%
27.79%
44.87%
8,059,057
6,248,838
10,091,432
22,489,454
41,269,868
0.545
22,489,454
2,443,039
1,935,662
3,130,636
10.86%
8.61%
13.92%
2,443,039
1,935,662
3,130,636
22,489,454
41,269,868
0.545
22,489,454
567,853
369,992
798,619
2.52%
1.65%
3.55%
567,853
369,992
798,619
22,489,454
41,269,868
0.545
22,489,454
249,499
162,028
380,877
1.11%
0.72%
1.69%
249,499
162,028
380,877
22,489,454
41,269,868
0.545
22,489,454
94,522
59,279
127,916
0.42%
0.26%
0.57%
94,522
59,279
127,916
22,489,454
41,269,868
0.545
22,489,454
13,394
1,886
35,630
0.06%
0.01%
0.16%
13,394
1,886
35,630
22,489,454
41,269,868
0.545
22,489,454
2,934
181
10,204
0.01%
0.00%
0.05%
2,934
181
10,204
22,489,454
41,269,868
0.545
22,489,454
191
3
739
0.00%
0.00%
0.00%
191
3
739
22,489,454
41,269,868
0.545
22,489,454
1
0
2
0.00%
0.00%
0.00%
1
0
2
4,130,884
11,230,816
0.368
4,130,884
480,283
299,014
705,200
11.63%
7.24%
17.07%
480,283
299,014
705,200
4,130,884
11,230,816
0.368
4,130,884
49,241
22,877
90,899
1.19%
0.55%
2.20%
49,241
22,877
90,899
4,130,884
11,230,816
0.368
4,130,884
1,932
561
4,928
0.05%
0.01%
0.12%
1,932
561
4,928
4,130,884
11,230,816
0.368
4,130,884
281
55
829
0.01%
0.00%
0.02%
281
55
829
4,130,884
11,230,816
0.368
4,130,884
13
1
46
0.00%
0.00%
0.00%
13
1
46
4,130,884
11,230,816
0.368
4,130,884
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,130,884
11,230,816
0.368
4,130,884
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,130,884
11,230,816
0.368
4,130,884
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,130,884
11,230,816
0.368
4,130,884
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,855,509
17,977,203
0.493
8,855,509
3,113,061
2,462,803
4,054,035
35.15%
27.81%
45.78%
3,113,061
2,462,803
4,054,035
8,855,509
17,977,203
0.493
8,855,509
1,523,174
1,396,844
1,734,475
17.20%
15.77%
19.59%
1,523,174
1,396,844
1,734,475
8,855,509
17,977,203
0.493
8,855,509
876,902
817,750
932,569
9.90%
9.23%
10.53%
876,902
817,750
932,569
8,855,509
17,977,203
0.493
8,855,509
606,753
543,828
667,190
6.85%
6.14%
7.53%
606,753
543,828
667,190
8,855,509
17,977,203
0.493
8,855,509
273,748
225,644
326,090
3.09%
2.55%
3.68%
273,748
225,644
326,090
8,855,509
17,977,203
0.493
8,855,509
28,405
14,085
46,902
0.32%
0.16%
0.53%
28,405
14,085
46,902
8,855,509
17,977,203
0.493
8,855,509
5,847
1,930
12,818
0.07%
0.02%
0.14%
5,847
1,930
12,818
8,855,509
17,977,203
0.493
8,855,509
390
58
1,135
0.00%
0.00%
0.01%
390
58
1,135
8,855,509
17,977,203
0.493
8,855,509
2
0
5
0.00%
0.00%
0.00%
2
0
5
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 30 of 114
December 2016

-------
C.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All EPs Only
0.6
3,730
33,909
1.949
66,079
538
423
665
14.43%
11.33%
17.84%
6,552
4,358
9,216
2
3,730
33,909
1.949
66,079
148
120
181
3.98%
3.22%
4.85%
1,844
1,293
2,554
6
3,730
33,909
1.949
66,079
37
28
47
0.98%
0.74%
1.25%
420
253
632
10
3,730
33,909
1.949
66,079
18
13
25
0.49%
0.34%
0.66%
185
104
310
20
3,730
33,909
1.949
66,079
6
4
10
0.17%
0.10%
0.26%
55
28
99
60
3,730
33,909
1.949
66,079
1
0
2
0.03%
0.01%
0.06%
9
3
17
100
3,730
33,909
1.949
66,079
0
0
1
0.01%
0.00%
0.03%
4
1
9
200
3,730
33,909
1.949
66,079
0
0
0
0.00%
0.00%
0.01%
1
0
3
600
3,730
33,909
1.949
66,079
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
526
2,310
1.135
2,622
143
116
172
27.24%
21.97%
32.77%
841
688
999
2
526
2,310
1.135
2,622
48
39
58
9.07%
7.37%
10.96%
287
236
344
6
526
2,310
1.135
2,622
12
9
16
2.34%
1.77%
2.99%
73
56
92
10
526
2,310
1.135
2,622
6
5
8
1.21%
0.88%
1.61%
37
28
49
20
526
2,310
1.135
2,622
3
2
4
0.55%
0.36%
0.74%
18
13
23
60
526
2,310
1.135
2,622
1
0
1
0.17%
0.07%
0.29%
7
3
10
100
526
2,310
1.135
2,622
0
0
1
0.08%
0.02%
0.17%
3
1
7
200
526
2,310
1.135
2,622
0
0
0
0.02%
0.00%
0.06%
1
0
3
600
526
2,310
1.135
2,622
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
1,935
30,448
1.863
56,711
192
141
249
9.91%
7.31%
12.85%
3,674
2,055
5,708
2
1,935
30,448
1.863
56,711
36
26
47
1.85%
1.34%
2.45%
706
385
1,157
6
1,935
30,448
1.863
56,711
6
4
8
0.30%
0.20%
0.43%
110
41
208
10
1,935
30,448
1.863
56,711
3
2
4
0.15%
0.09%
0.22%
44
16
100
20
1,935
30,448
1.863
56,711
1
1
2
0.06%
0.03%
0.11%
13
4
31
60
1,935
30,448
1.863
56,711
0
0
1
0.01%
0.00%
0.03%
2
0
5
100
1,935
30,448
1.863
56,711
0
0
0
0.00%
0.00%
0.01%
0
0
2
200
1,935
30,448
1.863
56,711
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1,935
30,448
1.863
56,711
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
1,269
1,151
5.859
6,746
203
166
244
16.02%
13.05%
19.25%
2,037
1,616
2,509
2
1,269
1,151
5.859
6,746
65
55
76
5.12%
4.37%
5.99%
851
672
1,053
6
1,269
1,151
5.859
6,746
18
15
23
1.46%
1.14%
1.78%
237
156
332
10
1,269
1,151
5.859
6,746
9
6
12
0.70%
0.49%
0.93%
104
61
162
20
1,269
1,151
5.859
6,746
2
1
4
0.19%
0.09%
0.30%
25
11
45
60
1,269
1,151
5.859
6,746
0
0
0
0.01%
0.00%
0.02%
1
0
3
100
1,269
1,151
5.859
6,746
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1,269
1,151
5.859
6,746
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1,269
1,151
5.859
6,746
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 31 of 114
December 2016

-------
C.2 - CL Only
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
53,468,785
162,744,918
0.640
104,085,171
9,182,323
6,853,731
12,228,645
17.17%
12.82%
22.87%
17,243,554
12,767,697
22,845,057
53,468,785
162,744,918
0.640
104,085,171
2,749,689
2,085,784
3,609,160
5.14%
3.90%
6.75%
5,580,934
4,224,779
7,341,257
53,468,785
162,744,918
0.640
104,085,171
624,768
399,352
895,528
1.17%
0.75%
1.67%
1,456,691
959,436
2,043,182
53,468,785
162,744,918
0.640
104,085,171
265,018
151,566
440,249
0.50%
0.28%
0.82%
675,603
393,309
1,072,408
53,468,785
162,744,918
0.640
104,085,171
73,304
36,919
123,585
0.14%
0.07%
0.23%
196,742
87,933
346,645
53,468,785
162,744,918
0.640
104,085,171
7,262
1,065
19,308
0.01%
0.00%
0.04%
16,882
2,945
45,463
53,468,785
162,744,918
0.640
104,085,171
1,784
126
5,867
0.00%
0.00%
0.01%
4,271
443
13,177
53,468,785
162,744,918
0.640
104,085,171
171
4
627
0.00%
0.00%
0.00%
509
23
1,778
53,468,785
162,744,918
0.640
104,085,171
2
0
6
0.00%
0.00%
0.00%
8
0
29
25,745,076
62,876,111
0.555
34,880,095
5,907,153
4,405,303
7,893,318
22.94%
17.11%
30.66%
8,825,266
6,711,225
11,491,242
25,745,076
62,876,111
0.555
34,880,095
1,929,938
1,455,379
2,518,065
7.50%
5.65%
9.78%
2,960,038
2,233,576
3,853,427
25,745,076
62,876,111
0.555
34,880,095
441,216
261,118
657,280
1.71%
1.01%
2.55%
672,077
396,208
987,879
25,745,076
62,876,111
0.555
34,880,095
179,825
92,175
320,916
0.70%
0.36%
1.25%
273,530
137,282
479,724
25,745,076
62,876,111
0.555
34,880,095
48,992
24,861
83,255
0.19%
0.10%
0.32%
72,511
34,470
128,466
25,745,076
62,876,111
0.555
34,880,095
5,528
789
14,604
0.02%
0.00%
0.06%
8,044
1,770
20,246
25,745,076
62,876,111
0.555
34,880,095
1,392
98
4,558
0.01%
0.00%
0.02%
2,322
326
6,499
25,745,076
62,876,111
0.555
34,880,095
131
4
474
0.00%
0.00%
0.00%
314
20
1,031
25,745,076
62,876,111
0.555
34,880,095
1
0
4
0.00%
0.00%
0.00%
5
0
23
11,955,216
62,564,793
0.655
40,988,310
910,152
618,850
1,239,421
7.61%
5.18%
10.37%
2,917,763
1,832,355
4,231,227
11,955,216
62,564,793
0.655
40,988,310
169,456
113,557
238,770
1.42%
0.95%
2.00%
617,524
387,415
910,860
11,955,216
62,564,793
0.655
40,988,310
26,768
17,416
40,279
0.22%
0.15%
0.34%
124,183
73,386
203,578
11,955,216
62,564,793
0.655
40,988,310
12,904
8,315
19,379
0.11%
0.07%
0.16%
64,253
38,625
110,948
11,955,216
62,564,793
0.655
40,988,310
5,689
2,608
9,145
0.05%
0.02%
0.08%
28,685
12,785
49,060
11,955,216
62,564,793
0.655
40,988,310
945
119
2,592
0.01%
0.00%
0.02%
4,703
589
12,906
11,955,216
62,564,793
0.655
40,988,310
273
15
924
0.00%
0.00%
0.01%
1,358
74
4,586
11,955,216
62,564,793
0.655
40,988,310
34
0
130
0.00%
0.00%
0.00%
168
2
644
11,955,216
62,564,793
0.655
40,988,310
1
0
1
0.00%
0.00%
0.00%
3
0
6
15,768,493
37,304,014
0.756
28,216,767
2,365,018
1,829,577
3,095,905
15.00%
11.60%
19.63%
5,500,526
4,224,117
7,122,588
15,768,493
37,304,014
0.756
28,216,767
650,295
516,847
852,324
4.12%
3.28%
5.41%
2,003,372
1,603,787
2,576,971
15,768,493
37,304,014
0.756
28,216,767
156,784
120,819
197,969
0.99%
0.77%
1.26%
660,431
489,842
851,725
15,768,493
37,304,014
0.756
28,216,767
72,289
51,075
99,954
0.46%
0.32%
0.63%
337,820
217,401
481,736
15,768,493
37,304,014
0.756
28,216,767
18,622
9,450
31,185
0.12%
0.06%
0.20%
95,546
40,678
169,119
15,768,493
37,304,014
0.756
28,216,767
789
157
2,112
0.01%
0.00%
0.01%
4,135
586
12,312
15,768,493
37,304,014
0.756
28,216,767
118
12
385
0.00%
0.00%
0.00%
590
42
2,091
15,768,493
37,304,014
0.756
28,216,767
6
0
23
0.00%
0.00%
0.00%
27

103
15,768,493
37,304,014
0.756
28,216,767
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 32 of 114
December 2016

-------
C.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
National
Number
MR Ratio
National
Number of
Number of
UCMR 2 MRs
Predicted to
have Any
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation

UCMR 2 MRs
Systems

MRs
Detects
Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
1,853
33,909
1.281
43,431
527
428
637
28.47%
23.08%
34.39%
8,223
5,918
10,699

2
1,853
33,909
1.281
43,431
164
137
194
8.84%
7.41%
10.48%
2,038
1,416
2,710

6
1,853
33,909
1.281
43,431
54
47
63
2.93%
2.53%
3.39%
382
249
554

10
1,853
33,909
1.281
43,431
32
27
38
1.74%
1.46%
2.06%
166
108
245
All MRs Only
20
1,853
33,909
1.281
43,431
13
10
17
0.72%
0.54%
0.92%
50
30
77

60
1,853
33,909
1.281
43,431
2
1
3
0.09%
0.04%
0.16%
8
3
13

100
1,853
33,909
1.281
43,431
1
0
1
0.03%
0.01%
0.06%
3
1
7

200
1,853
33,909
1.281
43,431
0
0
0
0.00%
0.00%
0.01%
0
0
2

600
1,853
33,909
1.281
43,431
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
502
2,310
1.097
2,535
203
171
237
40.41%
34.08%
47.23%
1,166
999
1,335

2
502
2,310
1.097
2,535
64
54
77
12.84%
10.81%
15.25%
395
336
462

6
502
2,310
1.097
2,535
16
13
19
3.19%
2.57%
3.86%
96
78
116
MRs Only at
10
502
2,310
1.097
2,535
8
6
10
1.58%
1.16%
2.04%
46
33
60
Surface Water
20
502
2,310
1.097
2,535
3
2
4
0.62%
0.40%
0.90%
17
12
24
Systems
60
502
2,310
1.097
2,535
1
0
1
0.16%
0.05%
0.28%
6
2
9

100
502
2,310
1.097
2,535
0
0
1
0.07%
0.01%
0.16%
3
0
6

200
502
2,310
1.097
2,535
0
0
0
0.01%
0.00%
0.04%
0
0
2

600
502
2,310
1.097
2,535
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
934
30,448
1.234
37,559
161
115
210
17.24%
12.29%
22.49%
5,356
3,544
7,300

2
934
30,448
1.234
37,559
23
15
33
2.48%
1.56%
3.55%
881
492
1,302

6
934
30,448
1.234
37,559
2
1
3
0.19%
0.08%
0.34%
68
20
137
MRs Only at
10
934
30,448
1.234
37,559
0
0
1
0.04%
0.01%
0.10%
14
3
35
Ground Water
20
934
30,448
1.234
37,559
0
0
0
0.00%
0.00%
0.01%
1
0
3
Systems
60
934
30,448
1.234
37,559
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
934
30,448
1.234
37,559
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
934
30,448
1.234
37,559
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
934
30,448
1.234
37,559
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
417
1,151
2.899
3,337
164
142
190
39.23%
34.00%
45.60%
1,702
1,376
2,063

2
417
1,151
2.899
3,337
76
69
85
18.26%
16.43%
20.28%
762
587
946

6
417
1,151
2.899
3,337
37
33
40
8.78%
7.97%
9.64%
218
152
302
MRs Only at
10
417
1,151
2.899
3,337
24
21
27
5.76%
5.05%
6.46%
106
72
151
Mixed Water
20
417
1,151
2.899
3,337
10
8
12
2.43%
1.91%
2.99%
32
17
50
Systems
60
417
1,151
2.899
3,337
1
0
1
0.22%
0.11%
0.35%
2
1
4

100
417
1,151
2.899
3,337
0
0
0
0.04%
0.01%
0.09%
0
0
1

200
417
1,151
2.899
3,337
0
0
0
0.00%
0.00%
0.01%
0
0
0

600
417
1,151
2.899
3,337
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 33 of 114
December 2016

-------
C.2 - CL Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population
Served by MRs Predicted to have Any
Detects Exceeding Threshold -
National Extrapolation
Total Population
Served by MRs
with Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Population Served by MRs
with Any Detects Exceeding Threshold
- National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
39,759,814
162,744,918
0.443
72,077,607
12,966,668
10,021,643
16,502,127
32.61%
25.21%
41.50%
22,529,308
17,177,884
28,742,580
39,759,814
162,744,918
0.443
72,077,607
4,428,446
3,673,883
5,482,006
11.14%
9.24%
13.79%
7,547,563
6,052,920
9,515,094
39,759,814
162,744,918
0.443
72,077,607
1,560,653
1,270,893
1,889,251
3.93%
3.20%
4.75%
2,466,125
1,940,124
3,087,071
39,759,814
162,744,918
0.443
72,077,607
910,630
737,306
1,128,823
2.29%
1.85%
2.84%
1,361,190
1,023,098
1,769,809
39,759,814
162,744,918
0.443
72,077,607
381,648
289,710
480,768
0.96%
0.73%
1.21%
504,225
340,565
701,277
39,759,814
162,744,918
0.443
72,077,607
42,324
16,078
83,885
0.11%
0.04%
0.21%
47,616
17,155
97,062
39,759,814
162,744,918
0.443
72,077,607
8,889
2,127
23,316
0.02%
0.01%
0.06%
9,926
2,272
26,137
39,759,814
162,744,918
0.443
72,077,607
593
62
1,921
0.00%
0.00%
0.00%
706
68
2,335
39,759,814
162,744,918
0.443
72,077,607
2
0
7
0.00%
0.00%
0.00%
3
0
13
24,418,492
62,876,111
0.530
33,325,706
8,879,722
6,915,781
11,086,468
36.36%
28.32%
45.40%
12,742,465
10,077,325
15,742,194
24,418,492
62,876,111
0.530
33,325,706
2,713,316
2,152,875
3,465,777
11.11%
8.82%
14.19%
3,994,079
3,186,662
5,046,895
24,418,492
62,876,111
0.530
33,325,706
641,262
421,896
898,488
2.63%
1.73%
3.68%
986,935
669,348
1,363,383
24,418,492
62,876,111
0.530
33,325,706
282,305
178,587
432,070
1.16%
0.73%
1.77%
437,562
259,791
671,949
24,418,492
62,876,111
0.530
33,325,706
101,512
61,119
144,303
0.42%
0.25%
0.59%
135,775
71,281
221,293
24,418,492
62,876,111
0.530
33,325,706
13,677
1,960
36,329
0.06%
0.01%
0.15%
15,616
2,578
40,449
24,418,492
62,876,111
0.530
33,325,706
3,014
195
10,406
0.01%
0.00%
0.04%
3,660
313
11,952
24,418,492
62,876,111
0.530
33,325,706
203
4
783
0.00%
0.00%
0.00%
304
10
1,157
24,418,492
62,876,111
0.530
33,325,706
1
0
2
0.00%
0.00%
0.00%
2
0
8
6,034,024
62,564,793
0.361
22,600,697
755,894
476,740
1,087,753
12.53%
7.90%
18.03%
3,089,023
1,903,920
4,436,982
6,034,024
62,564,793
0.361
22,600,697
99,160
48,605
166,928
1.64%
0.81%
2.77%
479,266
225,206
797,473
6,034,024
62,564,793
0.361
22,600,697
6,691
2,227
15,253
0.11%
0.04%
0.25%
36,913
11,528
84,791
6,034,024
62,564,793
0.361
22,600,697
1,372
314
3,547
0.02%
0.01%
0.06%
7,742
1,631
20,386
6,034,024
62,564,793
0.361
22,600,697
104
11
329
0.00%
0.00%
0.01%
591
54
1,955
6,034,024
62,564,793
0.361
22,600,697
1
0
2
0.00%
0.00%
0.00%
3
0
10
6,034,024
62,564,793
0.361
22,600,697
0
0
0
0.00%
0.00%
0.00%
0
0
0
6,034,024
62,564,793
0.361
22,600,697
0
0
0
0.00%
0.00%
0.00%
0
0
0
6,034,024
62,564,793
0.361
22,600,697
0
0
0
0.00%
0.00%
0.00%
0
0
0
9,307,298
37,304,014
0.433
16,151,204
3,331,053
2,629,121
4,327,905
35.79%
28.25%
46.50%
6,697,820
5,196,639
8,563,404
9,307,298
37,304,014
0.433
16,151,204
1,615,969
1,472,404
1,849,301
17.36%
15.82%
19.87%
3,074,218
2,641,052
3,670,725
9,307,298
37,304,014
0.433
16,151,204
912,700
846,771
975,510
9.81%
9.10%
10.48%
1,442,278
1,259,249
1,638,898
9,307,298
37,304,014
0.433
16,151,204
626,953
558,404
693,205
6.74%
6.00%
7.45%
915,886
761,677
1,077,474
9,307,298
37,304,014
0.433
16,151,204
280,032
228,580
336,136
3.01%
2.46%
3.61%
367,859
269,231
478,029
9,307,298
37,304,014
0.433
16,151,204
28,647
14,118
47,555
0.31%
0.15%
0.51%
31,997
14,578
56,603
9,307,298
37,304,014
0.433
16,151,204
5,875
1,932
12,910
0.06%
0.02%
0.14%
6,266
1,959
14,184
9,307,298
37,304,014
0.433
16,151,204
391
58
1,138
0.00%
0.00%
0.01%
402
58
1,177
9,307,298
37,304,014
0.433
16,151,204
2
0
5
0.00%
0.00%
0.00%
2
0
5
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 34 of 114
December 2016

-------
C.3-CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All EPs Only
0.6
31
849
2.055
1,744
25
22
29
68.91%
54.60%
85.64%
1,202
952
1,493
2
31
849
2.055
1,744
19
17
22
46.02%
35.93%
57.51%
803
626
1,003
6
31
849
2.055
1,744
13
11
15
25.77%
21.01%
32.21%
449
366
562
10
31
849
2.055
1,744
9
8
11
18.02%
14.26%
22.64%
314
249
395
20
31
849
2.055
1,744
6
4
7
9.86%
7.10%
13.25%
172
124
231
60
31
849
2.055
1,744
2
1
3
2.46%
0.88%
4.64%
43
15
81
100
31
849
2.055
1,744
1
0
2
0.98%
0.22%
2.35%
17
4
41
200
31
849
2.055
1,744
0
0
1
0.20%
0.02%
0.64%
4
0
11
600
31
849
2.055
1,744
0
0
0
0.01%
0.00%
0.03%
0
0
0
EPs Only at Surface
Water Systems
0.6
15
125
1.071
134
13
12
15
88.10%
79.95%
96.86%
118
107
130
2
15
125
1.071
134
11
11
12
75.26%
70.37%
81.07%
101
94
109
6
15
125
1.071
134
8
7
9
53.77%
47.14%
60.12%
72
63
81
10
15
125
1.071
134
6
5
7
41.08%
35.26%
46.92%
55
47
63
20
15
125
1.071
134
4
3
5
26.47%
21.92%
31.09%
36
29
42
60
15
125
1.071
134
1
1
2
9.72%
6.33%
13.64%
13
8
18
100
15
125
1.071
134
1
0
1
5.17%
2.07%
7.98%
7
3
11
200
15
125
1.071
134
0
0
1
1.56%
0.23%
3.89%
2
0
5
600
15
125
1.071
134
0
0
0
0.07%
0.00%
0.27%
0
0
0
EPs Only at Ground
Water Systems
0.6
4
482
1.333
642
2
1
3
39.96%
19.64%
68.75%
257
126
441
2
4
482
1.333
642
1
0
1
14.03%
1.65%
29.14%
90
11
187
6
4
482
1.333
642
0
0
0
2.19%
0.02%
8.66%
14
0
56
10
4
482
1.333
642
0
0
0
0.64%
0.00%
2.94%
4
0
19
20
4
482
1.333
642
0
0
0
0.08%
0.00%
0.35%
1
0
2
60
4
482
1.333
642
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
4
482
1.333
642
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
4
482
1.333
642
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
4
482
1.333
642
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
12
242
4.000
967
10
9
11
85.47%
74.28%
95.29%
827
719
922
2
12
242
4.000
967
8
6
9
63.21%
53.90%
73.07%
611
521
707
6
12
242
4.000
967
5
4
5
37.53%
31.31%
43.98%
363
303
425
10
12
242
4.000
967
3
2
4
26.35%
20.82%
32.34%
255
201
313
20
12
242
4.000
967
2
1
2
14.05%
9.76%
19.34%
136
94
187
60
12
242
4.000
967
0
0
1
3.08%
0.71%
6.47%
30
7
63
100
12
242
4.000
967
0
0
0
1.05%
0.10%
3.13%
10
1
30
200
12
242
4.000
967
0
0
0
0.15%
0.00%
0.61%
1
0
6
600
12
242
4.000
967
0
0
0
0.00%
0.00%
0.01%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 35 of 114
December 2016

-------
C.3-CA Only
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR
2 EPs Predicted
to have Any
Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted
to have Any
Detects Exceeding
Threshold 
National
Extrapolation
90% CI on Percent of Population
Served by EPs Predicted to have Any
Detects Exceeding Threshold -
National Extrapolation
Total Population
Served by EPs
with Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Population Served by EPs
with Any Detects Exceeding Threshold
- National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
47,702
1,335,490
0.617
824,600
38,347
30,852
45,163
73.07%
53.42%
90.91%
602,562
440,508
749,637
47,702
1,335,490
0.617
824,600
29,003
24,707
34,876
47.65%
36.05%
63.49%
392,917
297,270
523,574
47,702
1,335,490
0.617
824,600
19,557
16,540
23,101
26.84%
21.71%
34.13%
221,340
179,003
281,414
47,702
1,335,490
0.617
824,600
15,375
13,145
18,197
19.75%
16.02%
24.46%
162,855
132,132
201,719
47,702
1,335,490
0.617
824,600
10,638
8,623
12,766
12.30%
9.14%
15.85%
101,406
75,389
130,721
47,702
1,335,490
0.617
824,600
4,460
2,780
6,306
4.16%
2.21%
6.55%
34,311
18,186
54,045
47,702
1,335,490
0.617
824,600
2,482
952
3,992
2.09%
0.71%
3.80%
17,254
5,868
31,367
47,702
1,335,490
0.617
824,600
769
107
1,924
0.59%
0.08%
1.55%
4,873
641
12,811
47,702
1,335,490
0.617
824,600
33

133
0.02%
0.00%
0.10%
195
4
804
28,097
317,258
0.519
164,628
24,392
21,156
27,495
86.81%
75.30%
97.86%
142,919
123,958
161,101
28,097
317,258
0.519
164,628
20,604
18,781
23,044
73.33%
66.85%
82.02%
120,723
110,046
135,023
28,097
317,258
0.519
164,628
15,434
13,329
17,604
54.93%
47.44%
62.66%
90,431
78,101
103,150
28,097
317,258
0.519
164,628
12,544
10,990
14,547
44.65%
39.11%
51.78%
73,498
64,391
85,237
28,097
317,258
0.519
164,628
9,112
7,650
10,587
32.43%
27.23%
37.68%
53,390
44,822
62,035
28,097
317,258
0.519
164,628
4,140
2,706
5,637
14.73%
9.63%
20.06%
24,257
15,854
33,030
28,097
317,258
0.519
164,628
2,376
941
3,680
8.45%
3.35%
13.10%
13,919
5,513
21,562
28,097
317,258
0.519
164,628
754
107
1,863
2.68%
0.38%
6.63%
4,418
626
10,917
28,097
317,258
0.519
164,628
32

133
0.12%
0.00%
0.47%
190
4
777
5,055
405,603
0.500
202,802
2,432
1,366
3,841
48.11%
27.03%
75.99%
97,570
54,817
154,115
5,055
405,603
0.500
202,802
951
120
1,930
18.82%
2.38%
38.18%
38,170
4,830
77,436
5,055
405,603
0.500
202,802
157
2
638
3.11%
0.04%
12.63%
6,300
75
25,604
5,055
405,603
0.500
202,802
47
0
209
0.92%
0.00%
4.13%
1,873
6
8,383
5,055
405,603
0.500
202,802
6
0
26
0.12%
0.00%
0.52%
242
0
1,057
5,055
405,603
0.500
202,802
0
0
0
0.00%
0.00%
0.00%
3
0
9
5,055
405,603
0.500
202,802
0
0
0
0.00%
0.00%
0.00%
0
0
1
5,055
405,603
0.500
202,802
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,055
405,603
0.500
202,802
0
0
0
0.00%
0.00%
0.00%
0
0
0
14,550
612,628
0.746
457,171
11,524
8,330
13,826
79.20%
57.25%
95.02%
362,072
261,734
434,420
14,550
612,628
0.746
457,171
7,448
5,805
9,902
51.19%
39.90%
68.05%
234,024
182,394
311,115
14,550
612,628
0.746
457,171
3,966
3,209
4,859
27.26%
22.05%
33.39%
124,609
100,826
152,660
14,550
612,628
0.746
457,171
2,784
2,156
3,440
19.14%
14.82%
23.65%
87,485
67,735
108,099
14,550
612,628
0.746
457,171
1,521
973
2,152
10.45%
6.69%
14.79%
47,775
30,567
67,628
14,550
612,628
0.746
457,171
320
74
669
2.20%
0.51%
4.59%
10,051
2,332
21,005
14,550
612,628
0.746
457,171
106
11
312
0.73%
0.08%
2.14%
3,335
355
9,804
14,550
612,628
0.746
457,171
14
0
60
0.10%
0.00%
0.41%
455
15
1,894
14,550
612,628
0.746
457,171
0
0
1
0.00%
0.00%
0.01%
6
0
28
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 36 of 114
December 2016

-------
C.3-CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All MRs Only
0.6
56
849
2.055
1,744
28
25
31
47.66%
38.36%
56.75%
831
669
990
2
56
849
2.055
1,744
24
22
26
35.01%
29.22%
42.69%
610
509
744
6
56
849
2.055
1,744
16
14
19
20.22%
14.98%
25.99%
352
261
453
10
56
849
2.055
1,744
12
11
14
14.18%
10.90%
18.69%
247
190
326
20
56
849
2.055
1,744
8
7
10
9.13%
7.45%
11.36%
159
130
198
60
56
849
2.055
1,744
4
3
5
5.56%
4.22%
6.38%
97
74
111
100
56
849
2.055
1,744
2
1
3
3.97%
2.09%
5.49%
69
37
96
200
56
849
2.055
1,744
1
0
2
1.58%
0.38%
3.23%
28
7
56
600
56
849
2.055
1,744
0
0
0
0.10%
0.00%
0.38%
2
0
7
MRs Only at
Surface Water
Systems
0.6
29
125
1.071
134
15
14
15
50.89%
48.46%
51.72%
68
65
69
2
29
125
1.071
134
14
14
15
48.24%
46.56%
50.30%
65
62
68
6
29
125
1.071
134
11
10
12
36.77%
33.48%
40.07%
49
45
54
10
29
125
1.071
134
8
8
9
28.84%
25.97%
31.92%
39
35
43
20
29
125
1.071
134
6
5
6
19.65%
16.93%
22.23%
26
23
30
60
29
125
1.071
134
2
1
3
6.75%
4.72%
9.18%
9
6
12
100
29
125
1.071
134
1
0
1
3.27%
1.64%
5.02%
4
2
7
200
29
125
1.071
134
0
0
1
0.88%
0.16%
2.07%
1
0
3
600
29
125
1.071
134
0
0
0
0.03%
0.00%
0.11%
0
0
0
MRs Only at
Ground Water
Systems
0.6
7
482
1.333
642
3
2
4
41.33%
28.66%
55.85%
265
184
359
2
7
482
1.333
642
2
1
3
26.88%
18.31%
38.23%
173
118
245
6
7
482
1.333
642
1
0
1
9.50%
2.32%
18.25%
61
15
117
10
7
482
1.333
642
0
0
1
3.86%
0.40%
9.95%
25
3
64
20
7
482
1.333
642
0
0
0
0.68%
0.02%
2.53%
4
0
16
60
7
482
1.333
642
0
0
0
0.01%
0.00%
0.06%
0
0
0
100
7
482
1.333
642
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
7
482
1.333
642
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
7
482
1.333
642
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
20
242
4.000
967
10
9
12
51.42%
43.41%
58.05%
497
420
562
2
20
242
4.000
967
8
7
9
38.57%
34.06%
44.61%
373
329
431
6
20
242
4.000
967
5
4
6
25.03%
20.82%
29.18%
242
201
282
10
20
242
4.000
967
4
3
5
18.99%
15.77%
22.65%
184
153
219
20
20
242
4.000
967
3
2
3
13.28%
11.06%
15.71%
128
107
152
60
20
242
4.000
967
2
1
2
9.08%
6.95%
10.19%
88
67
99
100
20
242
4.000
967
1
1
2
6.69%
3.55%
9.19%
65
34
89
200
20
242
4.000
967
1
0
1
2.73%
0.66%
5.53%
26
6
54
600
20
242
4.000
967
0
0
0
0.18%
0.01%
0.67%
2
0
7
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 37 of 114
December 2016

-------
C.3-CA Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR
2 MRs Predicted
to have Any
Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted
to have Any
Detects Exceeding
Threshold 
National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
47,702
1,335,490
0.617
824,600
43,239
38,216
47,059
82.33%
64.48%
97.43%
678,900
531,724
803,370
47,702
1,335,490
0.617
824,600
36,545
32,873
41,083
58.98%
47.05%
74.80%
486,342
387,944
616,791
47,702
1,335,490
0.617
824,600
26,147
22,481
30,382
35.99%
28.21%
45.68%
296,792
232,648
376,652
47,702
1,335,490
0.617
824,600
21,040
18,448
24,580
27.16%
22.02%
34.42%
223,983
181,582
283,862
47,702
1,335,490
0.617
824,600
15,484
13,061
17,686
18.66%
15.09%
22.71%
153,838
124,393
187,261
47,702
1,335,490
0.617
824,600
6,813
4,942
8,846
9.48%
7.04%
11.55%
78,142
58,076
95,282
47,702
1,335,490
0.617
824,600
3,901
1,927
5,577
6.16%
3.16%
8.61%
50,783
26,056
71,031
47,702
1,335,490
0.617
824,600
1,252
248
2,816
2.27%
0.51%
4.80%
18,688
4,185
39,541
47,702
1,335,490
0.617
824,600
57
2
211
0.13%
0.00%
0.49%
1,089
39
4,037
28,097
317,258
0.519
164,628
27,819
27,007
28,096
99.01%
96.12%
100.00%
162,999
158,243
164,625
28,097
317,258
0.519
164,628
26,680
25,682
27,490
94.96%
91.41%
97.84%
156,329
150,478
161,072
28,097
317,258
0.519
164,628
20,807
18,586
23,208
74.05%
66.15%
82.60%
121,914
108,900
135,984
28,097
317,258
0.519
164,628
17,214
15,581
19,447
61.27%
55.46%
69.21%
100,861
91,296
113,945
28,097
317,258
0.519
164,628
13,035
11,189
14,492
46.39%
39.82%
51.58%
76,378
65,557
84,910
28,097
317,258
0.519
164,628
5,318
3,803
7,147
18.93%
13.53%
25.44%
31,161
22,282
41,879
28,097
317,258
0.519
164,628
2,809
1,350
4,077
10.00%
4.80%
14.51%
16,459
7,908
23,887
28,097
317,258
0.519
164,628
808
141
1,915
2.88%
0.50%
6.81%
4,736
827
11,218
28,097
317,258
0.519
164,628
27

102
0.10%
0.00%
0.36%
159
3
596
5,055
405,603
0.500
202,802
3,611
2,449
4,937
71.43%
48.45%
97.66%
144,860
98,262
198,050
5,055
405,603
0.500
202,802
2,308
1,324
3,290
45.66%
26.20%
65.09%
92,599
53,135
132,001
5,055
405,603
0.500
202,802
814
157
1,753
16.10%
3.10%
34.68%
32,649
6,297
70,327
5,055
405,603
0.500
202,802
333
26
994
6.60%
0.51%
19.65%
13,379
1,036
39,859
5,055
405,603
0.500
202,802
59

229
1.18%
0.02%
4.53%
2,386
43
9,186
5,055
405,603
0.500
202,802
1
0
5
0.02%
0.00%
0.10%
42
0
194
5,055
405,603
0.500
202,802
0
0
0
0.00%
0.00%
0.01%
4
0
15
5,055
405,603
0.500
202,802
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,055
405,603
0.500
202,802
0
0
0
0.00%
0.00%
0.00%
0
0
0
14,550
612,628
0.746
457,171
11,809
8,759
14,026
81.16%
60.20%
96.40%
371,041
275,219
440,695
14,550
612,628
0.746
457,171
7,556
5,867
10,303
51.93%
40.32%
70.81%
237,414
184,331
323,718
14,550
612,628
0.746
457,171
4,527
3,738
5,421
31.11%
25.69%
37.26%
142,229
117,451
170,341
14,550
612,628
0.746
457,171
3,493
2,841
4,139
24.00%
19.52%
28.45%
109,743
89,250
130,058
14,550
612,628
0.746
457,171
2,389
1,871
2,965
16.42%
12.86%
20.38%
75,074
58,793
93,164
14,550
612,628
0.746
457,171
1,494
1,139
1,693
10.27%
7.83%
11.64%
46,939
35,795
53,210
14,550
612,628
0.746
457,171
1,092
578
1,500
7.51%
3.97%
10.31%
34,321
18,149
47,129
14,550
612,628
0.746
457,171
444
107
901
3.05%
0.73%
6.20%
13,953
3,358
28,322
14,550
612,628
0.746
457,171
30

110
0.20%
0.01%
0.75%
930
35
3,441
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 38 of 114
December 2016

-------
C.3-CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
All EPs Only
0.6
91
435
1.969
856
53
44
62
60.91%
50.56%
72.04%
521
433
617
2
91
435
1.969
856
30
26
36
34.67%
28.41%
41.71%
297
243
357
6
91
435
1.969
856
14
12
17
15.07%
11.76%
18.70%
129
101
160
10
91
435
1.969
856
9
7
11
9.14%
6.69%
11.83%
78
57
101
20
91
435
1.969
856
5
3
6
4.12%
2.61%
6.01%
35
22
51
60
91
435
1.969
856
1
1
2
0.84%
0.40%
1.51%
7
3
13
100
91
435
1.969
856
0
0
1
0.31%
0.09%
0.66%
3
1
6
200
91
435
1.969
856
0
0
0
0.05%
0.01%
0.16%
0
0
1
600
91
435
1.969
856
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
44
183
1.467
268
30
26
33
67.45%
59.40%
76.11%
181
159
204
2
44
183
1.467
268
19
17
21
43.32%
38.55%
48.26%
116
103
130
6
44
183
1.467
268
11
9
12
23.97%
21.34%
26.79%
64
57
72
10
44
183
1.467
268
7
6
8
16.44%
14.09%
18.85%
44
38
51
20
44
183
1.467
268
4
3
5
8.96%
7.19%
10.88%
24
19
29
60
44
183
1.467
268
1
1
2
2.41%
1.25%
3.79%
6
3
10
100
44
183
1.467
268
0
0
1
0.93%
0.28%
1.89%
3
1
5
200
44
183
1.467
268
0
0
0
0.16%
0.02%
0.50%
0
0
1
600
44
183
1.467
268
0
0
0
0.00%
0.00%
0.01%
0
0
0
EPs Only at Ground
Water Systems
0.6
31
166
1.476
245
11
8
15
37.02%
26.63%
49.35%
91
65
121
2
31
166
1.476
245
5
3
6
15.26%
10.76%
20.80%
37
26
51
6
31
166
1.476
245
1
1
2
4.13%
1.91%
6.74%
10
5
17
10
31
166
1.476
245
1
0
1
1.71%
0.47%
3.57%
4
1
9
20
31
166
1.476
245
0
0
0
0.36%
0.04%
1.06%
1
0
3
60
31
166
1.476
245
0
0
0
0.01%
0.00%
0.05%
0
0
0
100
31
166
1.476
245
0
0
0
0.00%
0.00%
0.01%
0
0
0
200
31
166
1.476
245
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
31
166
1.476
245
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
16
86
4.000
342
12
10
14
72.86%
60.75%
85.08%
250
208
291
2
16
86
4.000
342
7
5
8
41.77%
33.09%
51.54%
143
113
176
6
16
86
4.000
342
3
2
3
15.92%
11.30%
20.91%
55
39
72
10
16
86
4.000
342
1
1
2
8.72%
5.33%
12.22%
30
18
42
20
16
86
4.000
342
0
0
1
3.01%
0.86%
5.73%
10
3
20
60
16
86
4.000
342
0
0
0
0.21%
0.01%
0.77%
1
0
3
100
16
86
4.000
342
0
0
0
0.04%
0.00%
0.16%
0
0
1
200
16
86
4.000
342
0
0
0
0.00%
0.00%
0.01%
0
0
0
600
16
86
4.000
342
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 39 of 114
December 2016

-------
C.3-CA Only
Total Population
Served by UCMR
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR
2 EPs Predicted
to have Any
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted
to have Any
Detects Exceeding
90% CI on Percent of Population
Served by EPs Predicted to have Any
Detects Exceeding Threshold -
National Extrapolation
Total Population
Served by EPs
with Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Population Served by EPs
with Any Detects Exceeding Threshold
- National Extrapolation



Detects
Exceeding
Threshold
Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
1,601,245
13,281,323
0.571
7,588,200
982,907
819,407
1,140,882
63.98%
53.45%
74.04%
4,855,191
4,055,934
5,618,180
1,601,245
13,281,323
0.571
7,588,200
586,291
490,836
694,144
38.27%
31.81%
45.68%
2,903,737
2,413,619
3,465,995
1,601,245
13,281,323
0.571
7,588,200
279,737
228,324
339,351
17.94%
14.51%
21.87%
1,361,555
1,100,674
1,659,561
1,601,245
13,281,323
0.571
7,588,200
179,729
139,431
224,252
11.49%
8.46%
14.46%
871,792
641,705
1,097,580
1,601,245
13,281,323
0.571
7,588,200
88,325
60,792
122,225
5.45%
3.29%
8.25%
413,379
249,318
626,084
1,601,245
13,281,323
0.571
7,588,200
17,036
7,388
32,044
0.93%
0.37%
1.91%
70,796
28,311
145,263
1,601,245
13,281,323
0.571
7,588,200
5,481
1,612
12,147
0.29%
0.08%
0.67%
21,938
6,146
50,941
1,601,245
13,281,323
0.571
7,588,200
749
105
2,132
0.04%
0.01%
0.11%
2,917
401
8,363
1,601,245
13,281,323
0.571
7,588,200
11
0
44
0.00%
0.00%
0.00%
40
1
169
826,084
6,122,088
0.513
3,141,632
599,986
528,805
664,063
72.63%
64.01%
80.39%
2,281,773
2,011,067
2,525,459
826,084
6,122,088
0.513
3,141,632
396,684
347,630
444,990
48.02%
42.08%
53.87%
1,508,605
1,322,052
1,692,318
826,084
6,122,088
0.513
3,141,632
212,937
184,971
244,837
25.78%
22.39%
29.64%
809,809
703,455
931,124
826,084
6,122,088
0.513
3,141,632
143,090
120,916
168,679
17.32%
14.64%
20.42%
544,177
459,850
641,494
826,084
6,122,088
0.513
3,141,632
75,310
58,003
93,330
9.12%
7.02%
11.30%
286,408
220,588
354,936
826,084
6,122,088
0.513
3,141,632
16,116
7,357
28,450
1.95%
0.89%
3.44%
61,290
27,981
108,196
826,084
6,122,088
0.513
3,141,632
5,315
1,610
11,440
0.64%
0.19%
1.38%
20,214
6,124
43,505
826,084
6,122,088
0.513
3,141,632
739
105
2,094
0.09%
0.01%
0.25%
2,812
401
7,964
826,084
6,122,088
0.513
3,141,632
10
0
44
0.00%
0.00%
0.01%
40
1
168
572,142
4,295,660
0.522
2,242,948
228,280
159,995
300,375
39.90%
27.96%
52.50%
894,919
627,223
1,177,550
572,142
4,295,660
0.522
2,242,948
95,603
66,747
134,223
16.71%
11.67%
23.46%
374,789
261,664
526,189
572,142
4,295,660
0.522
2,242,948
24,995
10,577
42,897
4.37%
1.85%
7.50%
97,987
41,464
168,167
572,142
4,295,660
0.522
2,242,948
10,106
2,756
21,217
1.77%
0.48%
3.71%
39,618
10,803
83,175
572,142
4,295,660
0.522
2,242,948
2,062
223
6,127
0.36%
0.04%
1.07%
8,082
873
24,020
572,142
4,295,660
0.522
2,242,948
68

281
0.01%
0.00%
0.05%
268
3
1,102
572,142
4,295,660
0.522
2,242,948
10
0
35
0.00%
0.00%
0.01%
40
0
136
572,142
4,295,660
0.522
2,242,948
1
0
1
0.00%
0.00%
0.00%
2
0
5
572,142
4,295,660
0.522
2,242,948
0
0
0
0.00%
0.00%
0.00%
0
0
0
203,019
2,863,575
0.770
2,203,619
154,640
130,608
176,445
76.17%
64.33%
86.91%
1,678,498
1,417,645
1,915,171
203,019
2,863,575
0.770
2,203,619
94,004
76,459
114,931
46.30%
37.66%
56.61%
1,020,343
829,902
1,247,488
203,019
2,863,575
0.770
2,203,619
41,805
32,776
51,618
20.59%
16.14%
25.42%
453,758
355,755
560,270
203,019
2,863,575
0.770
2,203,619
26,533
15,759
34,356
13.07%
7.76%
16.92%
287,997
171,053
372,911
203,019
2,863,575
0.770
2,203,619
10,953
2,566
22,768
5.40%
1.26%
11.21%
118,889
27,857
247,128
203,019
2,863,575
0.770
2,203,619
851
30
3,313
0.42%
0.01%
1.63%
9,237
328
35,964
203,019
2,863,575
0.770
2,203,619
155
2
673
0.08%
0.00%
0.33%
1,685
22
7,300
203,019
2,863,575
0.770
2,203,619
9
0
36
0.00%
0.00%
0.02%
102
0
394
203,019
2,863,575
0.770
2,203,619
0
0
0
0.00%
0.00%
0.00%
0
0
1
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 40 of 114
December 2016

-------
C.3-CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
All MRs Only
0.6
64
435
1.451
630
60
55
65
91.19%
81.65%
100.65%
575
515
634
2
64
435
1.451
630
42
38
47
61.05%
54.07%
68.67%
385
341
433
6
64
435
1.451
630
22
19
25
30.95%
26.21%
35.62%
195
165
225
10
64
435
1.451
630
14
11
17
19.21%
15.16%
23.37%
121
96
147
20
64
435
1.451
630
6
4
8
7.69%
5.14%
10.66%
48
32
67
60
64
435
1.451
630
1
0
1
0.78%
0.27%
1.57%
5
2
10
100
64
435
1.451
630
0
0
0
0.17%
0.03%
0.43%
1
0
3
200
64
435
1.451
630
0
0
0
0.01%
0.00%
0.04%
0
0
0
600
64
435
1.451
630
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
30
183
1.300
238
37
35
38
122.43%
117.16%
126.90%
291
279
302
2
30
183
1.300
238
28
26
30
94.75%
88.12%
101.18%
225
210
241
6
30
183
1.300
238
16
14
17
52.35%
47.89%
56.80%
125
114
135
10
30
183
1.300
238
10
9
12
34.45%
30.01%
38.56%
82
71
92
20
30
183
1.300
238
5
4
6
15.37%
11.79%
18.97%
37
28
45
60
30
183
1.300
238
1
0
1
1.85%
0.70%
3.44%
4
2
8
100
30
183
1.300
238
0
0
0
0.42%
0.09%
1.04%
1
0
2
200
30
183
1.300
238
0
0
0
0.03%
0.00%
0.10%
0
0
0
600
30
183
1.300
238
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Ground Water
Systems
0.6
17
166
1.333
221
16
12
19
91.93%
71.24%
113.88%
203
158
252
2
17
166
1.333
221
7
5
9
40.27%
30.91%
52.05%
89
68
115
6
17
166
1.333
221
2
1
3
13.14%
8.03%
18.21%
29
18
40
10
17
166
1.333
221
1
0
2
6.29%
2.74%
10.26%
14
6
23
20
17
166
1.333
221
0
0
1
1.57%
0.30%
3.66%
3
1
8
60
17
166
1.333
221
0
0
0
0.06%
0.00%
0.21%
0
0
0
100
17
166
1.333
221
0
0
0
0.01%
0.00%
0.03%
0
0
0
200
17
166
1.333
221
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
17
166
1.333
221
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
17
86
2.000
171
8
8
8
46.81%
45.77%
47.06%
80
78
81
2
17
86
2.000
171
7
6
8
41.06%
36.69%
44.98%
70
63
77
6
17
86
2.000
171
4
3
5
24.23%
19.58%
28.69%
41
34
49
10
17
86
2.000
171
3
2
3
14.73%
10.58%
19.21%
25
18
33
20
17
86
2.000
171
1
0
1
4.91%
2.14%
8.14%
8
4
14
60
17
86
2.000
171
0
0
0
0.22%
0.03%
0.71%
0
0
1
100
17
86
2.000
171
0
0
0
0.03%
0.00%
0.10%
0
0
0
200
17
86
2.000
171
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
17
86
2.000
171
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 41 of 114
December 2016

-------
C.3-CA Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR
2 MRs Predicted
to have Any
Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted
to have Any
Detects Exceeding
Threshold 
National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
1,410,048
13,281,323
0.463
6,148,216
1,153,414
1,045,209
1,251,276
83.69%
76.77%
89.90%
5,145,625
4,719,858
5,527,533
1,410,048
13,281,323
0.463
6,148,216
812,608
730,208
903,362
61.68%
56.04%
67.77%
3,792,357
3,445,742
4,166,694
1,410,048
13,281,323
0.463
6,148,216
431,658
367,014
495,953
34.69%
29.30%
40.05%
2,132,852
1,801,170
2,462,620
1,410,048
13,281,323
0.463
6,148,216
273,549
216,381
331,437
22.14%
17.06%
27.25%
1,361,225
1,049,042
1,675,113
1,410,048
13,281,323
0.463
6,148,216
111,191
75,029
153,131
8.75%
5.42%
12.69%
537,697
333,269
780,234
1,410,048
13,281,323
0.463
6,148,216
11,245
3,592
23,810
0.78%
0.23%
1.77%
48,255
14,261
108,978
1,410,048
13,281,323
0.463
6,148,216
2,433
459
6,787
0.16%
0.03%
0.47%
9,977
1,783
28,646
1,410,048
13,281,323
0.463
6,148,216
180
12
593
0.01%
0.00%
0.04%
710
47
2,354
1,410,048
13,281,323
0.463
6,148,216
1
0
3
0.00%
0.00%
0.00%
3
0
10
783,703
6,122,088
0.487
2,980,456
741,932
704,871
768,780
94.67%
89.94%
98.10%
2,821,598
2,680,655
2,923,703
783,703
6,122,088
0.487
2,980,456
576,691
535,172
621,250
73.59%
68.29%
79.27%
2,193,180
2,035,282
2,362,639
783,703
6,122,088
0.487
2,980,456
318,738
284,733
351,234
40.67%
36.33%
44.82%
1,212,174
1,082,852
1,335,758
783,703
6,122,088
0.487
2,980,456
207,942
175,871
237,737
26.53%
22.44%
30.34%
790,811
668,843
904,122
783,703
6,122,088
0.487
2,980,456
90,110
67,290
113,553
11.50%
8.59%
14.49%
342,692
255,907
431,846
783,703
6,122,088
0.487
2,980,456
10,301
3,503
20,590
1.31%
0.45%
2.63%
39,175
13,320
78,306
783,703
6,122,088
0.487
2,980,456
2,309
454
6,300
0.29%
0.06%
0.80%
8,783
1,727
23,958
783,703
6,122,088
0.487
2,980,456
176
12
577
0.02%
0.00%
0.07%
668
47
2,193
783,703
6,122,088
0.487
2,980,456
1
0
3
0.00%
0.00%
0.00%
3
0
10
523,616
4,295,660
0.478
2,052,711
308,958
238,665
379,768
59.00%
45.58%
72.53%
1,211,196
935,631
1,488,791
523,616
4,295,660
0.478
2,052,711
138,668
101,890
181,434
26.48%
19.46%
34.65%
543,614
399,436
711,268
523,616
4,295,660
0.478
2,052,711
43,984
25,207
64,025
8.40%
4.81%
12.23%
172,428
98,817
250,996
523,616
4,295,660
0.478
2,052,711
20,437
8,582
35,486
3.90%
1.64%
6.78%
80,119
33,645
139,114
523,616
4,295,660
0.478
2,052,711
4,876
958
11,711
0.93%
0.18%
2.24%
19,117
3,754
45,911
523,616
4,295,660
0.478
2,052,711
167
5
616
0.03%
0.00%
0.12%
657
20
2,416
523,616
4,295,660
0.478
2,052,711
21
0
86
0.00%
0.00%
0.02%
84

339
523,616
4,295,660
0.478
2,052,711
1
0
3
0.00%
0.00%
0.00%
3
0
10
523,616
4,295,660
0.478
2,052,711
0
0
0
0.00%
0.00%
0.00%
0
0
0
102,729
2,863,575
0.389
1,115,048
102,525
101,672
102,729
99.80%
98.97%
100.00%
1,112,832
1,103,572
1,115,040
102,729
2,863,575
0.389
1,115,048
97,249
93,146
100,678
94.67%
90.67%
98.00%
1,055,563
1,011,024
1,092,787
102,729
2,863,575
0.389
1,115,048
68,936
57,075
80,693
67.10%
55.56%
78.55%
748,249
619,501
875,866
102,729
2,863,575
0.389
1,115,048
45,171
31,928
58,215
43.97%
31.08%
56.67%
490,295
346,554
631,876
102,729
2,863,575
0.389
1,115,048
16,205
6,781
27,867
15.77%
6.60%
27.13%
175,888
73,608
302,478
102,729
2,863,575
0.389
1,115,048
776
85
2,603
0.76%
0.08%
2.53%
8,423
921
28,256
102,729
2,863,575
0.389
1,115,048
102
5
401
0.10%
0.00%
0.39%
1,110
55
4,349
102,729
2,863,575
0.389
1,115,048
4
0
14
0.00%
0.00%
0.01%
39
0
151
102,729
2,863,575
0.389
1,115,048
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 42 of 114
December 2016

-------
C.3-CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All EPs Only
0.6
450
129
3.488
450
245
221
271
54.51%
49.13%
60.16%
245
221
271
2
450
129
3.488
450
129
118
141
28.63%
26.32%
31.24%
129
118
141
6
450
129
3.488
450
51
46
57
11.33%
10.15%
12.58%
51
46
57
10
450
129
3.488
450
29
25
33
6.47%
5.65%
7.41%
29
25
33
20
450
129
3.488
450
12
10
15
2.75%
2.18%
3.31%
12
10
15
60
450
129
3.488
450
2
1
3
0.46%
0.24%
0.71%
2
1
3
100
450
129
3.488
450
1
0
1
0.16%
0.05%
0.30%
1
0
1
200
450
129
3.488
450
0
0
0
0.03%
0.00%
0.09%
0
0
0
600
450
129
3.488
450
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
142
84
1.690
142
94
86
101
65.87%
60.81%
71.21%
94
86
101
2
142
84
1.690
142
55
51
59
38.39%
35.84%
41.23%
55
51
59
6
142
84
1.690
142
25
22
27
17.29%
15.84%
18.86%
25
22
27
10
142
84
1.690
142
15
13
17
10.41%
9.24%
11.78%
15
13
17
20
142
84
1.690
142
6
5
8
4.57%
3.70%
5.50%
6
5
8
60
142
84
1.690
142
1
1
2
0.95%
0.53%
1.39%
1
1
2
100
142
84
1.690
142
1
0
1
0.40%
0.12%
0.70%
1
0
1
200
142
84
1.690
142
0
0
0
0.08%
0.01%
0.25%
0
0
0
600
142
84
1.690
142
0
0
0
0.00%
0.00%
0.01%
0
0
0
EPs Only at Ground
Water Systems
0.6
68
17
4.000
68
15
9
22
21.92%
13.56%
31.78%
15
9
22
2
68
17
4.000
68
4
3
6
6.20%
3.80%
9.20%
4
3
6
6
68
17
4.000
68
1
0
1
1.15%
0.40%
2.05%
1
0
1
10
68
17
4.000
68
0
0
1
0.39%
0.07%
0.96%
0
0
1
20
68
17
4.000
68
0
0
0
0.06%
0.00%
0.22%
0
0
0
60
68
17
4.000
68
0
0
0
0.00%
0.00%
0.01%
0
0
0
100
68
17
4.000
68
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
68
17
4.000
68
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
68
17
4.000
68
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
240
28
8.571
240
137
126
148
57.02%
52.30%
61.67%
137
126
148
2
240
28
8.571
240
70
65
76
29.20%
27.06%
31.58%
70
65
76
6
240
28
8.571
240
26
23
28
10.69%
9.55%
11.86%
26
23
28
10
240
28
8.571
240
14
12
16
5.85%
5.10%
6.65%
14
12
16
20
240
28
8.571
240
6
5
7
2.42%
1.90%
2.90%
6
5
7
60
240
28
8.571
240
1
0
1
0.30%
0.13%
0.51%
1
0
1
100
240
28
8.571
240
0
0
0
0.07%
0.02%
0.15%
0
0
0
200
240
28
8.571
240
0
0
0
0.01%
0.00%
0.02%
0
0
0
600
240
28
8.571
240
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 43 of 114
December 2016

-------
C.3-CA Only
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR
2 EPs Predicted
to have Any
Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted
to have Any
Detects Exceeding
Threshold 
National
Extrapolation
90% CI on Percent of Population
Served by EPs Predicted to have Any
Detects Exceeding Threshold -
National Extrapolation
Total Population
Served by EPs
with Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Population Served by EPs
with Any Detects Exceeding Threshold
- National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
25,194,034
40,196,393
0.627
25,194,034
14,504,780
12,576,911
16,666,236
57.57%
49.92%
66.15%
14,504,780
12,576,911
16,666,236
25,194,034
40,196,393
0.627
25,194,034
7,474,491
6,603,792
8,526,082
29.67%
26.21%
33.84%
7,474,491
6,603,792
8,526,082
25,194,034
40,196,393
0.627
25,194,034
3,172,578
2,816,519
3,568,282
12.59%
11.18%
14.16%
3,172,578
2,816,519
3,568,282
25,194,034
40,196,393
0.627
25,194,034
1,946,809
1,677,178
2,285,243
7.73%
6.66%
9.07%
1,946,809
1,677,178
2,285,243
25,194,034
40,196,393
0.627
25,194,034
883,717
680,474
1,101,371
3.51%
2.70%
4.37%
883,717
680,474
1,101,371
25,194,034
40,196,393
0.627
25,194,034
150,333
74,297
264,649
0.60%
0.29%
1.05%
150,333
74,297
264,649
25,194,034
40,196,393
0.627
25,194,034
50,995
17,096
105,841
0.20%
0.07%
0.42%
50,995
17,096
105,841
25,194,034
40,196,393
0.627
25,194,034
8,600
1,171
23,263
0.03%
0.00%
0.09%
8,600
1,171
23,263
25,194,034
40,196,393
0.627
25,194,034
186
4
816
0.00%
0.00%
0.00%
186
4
816
17,311,212
30,089,884
0.575
17,311,212
10,735,477
9,475,301
12,040,014
62.01%
54.74%
69.55%
10,735,477
9,475,301
12,040,014
17,311,212
30,089,884
0.575
17,311,212
5,615,593
5,016,668
6,281,436
32.44%
28.98%
36.29%
5,615,593
5,016,668
6,281,436
17,311,212
30,089,884
0.575
17,311,212
2,414,423
2,190,333
2,652,773
13.95%
12.65%
15.32%
2,414,423
2,190,333
2,652,773
17,311,212
30,089,884
0.575
17,311,212
1,489,544
1,302,162
1,703,847
8.60%
7.52%
9.84%
1,489,544
1,302,162
1,703,847
17,311,212
30,089,884
0.575
17,311,212
676,203
522,699
838,249
3.91%
3.02%
4.84%
676,203
522,699
838,249
17,311,212
30,089,884
0.575
17,311,212
123,985
63,040
219,705
0.72%
0.36%
1.27%
123,985
63,040
219,705
17,311,212
30,089,884
0.575
17,311,212
44,946
15,370
92,994
0.26%
0.09%
0.54%
44,946
15,370
92,994
17,311,212
30,089,884
0.575
17,311,212
8,120
1,099
21,909
0.05%
0.01%
0.13%
8,120
1,099
21,909
17,311,212
30,089,884
0.575
17,311,212
183
4
807
0.00%
0.00%
0.00%
183
4
807
2,881,974
5,268,728
0.547
2,881,974
822,095
437,515
1,399,963
28.53%
15.18%
48.58%
822,095
437,515
1,399,963
2,881,974
5,268,728
0.547
2,881,974
259,347
143,733
492,401
9.00%
4.99%
17.09%
259,347
143,733
492,401
2,881,974
5,268,728
0.547
2,881,974
53,525
14,822
109,509
1.86%
0.51%
3.80%
53,525
14,822
109,509
2,881,974
5,268,728
0.547
2,881,974
19,229
2,764
55,972
0.67%
0.10%
1.94%
19,229
2,764
55,972
2,881,974
5,268,728
0.547
2,881,974
3,218
165
13,549
0.11%
0.01%
0.47%
3,218
165
13,549
2,881,974
5,268,728
0.547
2,881,974
64
0
320
0.00%
0.00%
0.01%
64
0
320
2,881,974
5,268,728
0.547
2,881,974
6
0
29
0.00%
0.00%
0.00%
6
0
29
2,881,974
5,268,728
0.547
2,881,974
0
0
1
0.00%
0.00%
0.00%
0
0
1
2,881,974
5,268,728
0.547
2,881,974
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,000,848
4,837,781
1.034
5,000,848
2,947,209
2,664,095
3,226,260
58.93%
53.27%
64.51%
2,947,209
2,664,095
3,226,260
5,000,848
4,837,781
1.034
5,000,848
1,599,551
1,443,392
1,752,246
31.99%
28.86%
35.04%
1,599,551
1,443,392
1,752,246
5,000,848
4,837,781
1.034
5,000,848
704,630
611,364
806,000
14.09%
12.23%
16.12%
704,630
611,364
806,000
5,000,848
4,837,781
1.034
5,000,848
438,035
372,251
525,424
8.76%
7.44%
10.51%
438,035
372,251
525,424
5,000,848
4,837,781
1.034
5,000,848
204,296
157,610
249,573
4.09%
3.15%
4.99%
204,296
157,610
249,573
5,000,848
4,837,781
1.034
5,000,848
26,284
11,257
44,624
0.53%
0.23%
0.89%
26,284
11,257
44,624
5,000,848
4,837,781
1.034
5,000,848
6,043
1,726
12,818
0.12%
0.03%
0.26%
6,043
1,726
12,818
5,000,848
4,837,781
1.034
5,000,848
480
72
1,354
0.01%
0.00%
0.03%
480
72
1,354
5,000,848
4,837,781
1.034
5,000,848
3
0
10
0.00%
0.00%
0.00%
3
0
10
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 44 of 114
December 2016

-------
C.3-CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All MRs Only
0.6
289
129
2.233
288
251
239
263
86.67%
82.49%
90.79%
250
238
261
2
289
129
2.233
288
181
171
191
62.07%
58.68%
65.79%
179
169
189
6
289
129
2.233
288
80
73
87
27.32%
24.81%
29.83%
79
71
86
10
289
129
2.233
288
43
38
48
14.69%
12.93%
16.46%
42
37
47
20
289
129
2.233
288
16
13
19
5.42%
4.51%
6.35%
16
13
18
60
289
129
2.233
288
2
2
3
0.81%
0.53%
1.18%
2
2
3
100
289
129
2.233
288
1
0
2
0.30%
0.12%
0.53%
1
0
2
200
289
129
2.233
288
0
0
1
0.07%
0.01%
0.18%
0
0
1
600
289
129
2.233
288
0
0
0
0.00%
0.00%
0.01%
0
0
0
MRs Only at
Surface Water
Systems
0.6
137
84
1.560
131
124
120
126
90.16%
87.76%
92.33%
118
115
121
2
137
84
1.560
131
98
94
101
71.47%
68.90%
74.04%
94
90
97
6
137
84
1.560
131
49
45
52
35.41%
32.98%
37.84%
46
43
50
10
137
84
1.560
131
27
25
30
19.94%
18.01%
21.87%
26
24
29
20
137
84
1.560
131
10
9
12
7.38%
6.23%
8.58%
10
8
11
60
137
84
1.560
131
2
1
2
1.13%
0.85%
1.49%
1
1
2
100
137
84
1.560
131
1
0
1
0.51%
0.22%
0.78%
1
0
1
200
137
84
1.560
131
0
0
0
0.13%
0.02%
0.34%
0
0
0
600
137
84
1.560
131
0
0
0
0.00%
0.00%
0.01%
0
0
0
MRs Only at
Ground Water
Systems
0.6
30
17
1.882
32
22
19
26
73.09%
62.48%
85.28%
23
20
27
2
30
17
1.882
32
11
9
14
37.34%
30.60%
45.56%
12
10
15
6
30
17
1.882
32
3
2
4
9.05%
5.49%
13.04%
3
2
4
10
30
17
1.882
32
1
0
2
3.04%
1.35%
5.09%
1
0
2
20
30
17
1.882
32
0
0
0
0.41%
0.10%
0.97%
0
0
0
60
30
17
1.882
32
0
0
0
0.01%
0.00%
0.02%
0
0
0
100
30
17
1.882
32
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
30
17
1.882
32
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
30
17
1.882
32
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
122
28
4.464
125
106
100
111
86.49%
82.09%
90.59%
108
103
113
2
122
28
4.464
125
71
67
76
58.56%
55.15%
62.32%
73
69
78
6
122
28
4.464
125
29
26
31
23.52%
21.18%
25.73%
29
26
32
10
122
28
4.464
125
15
13
17
12.17%
10.58%
13.70%
15
13
17
20
122
28
4.464
125
6
5
7
4.65%
3.84%
5.39%
6
5
7
60
122
28
4.464
125
1
0
1
0.68%
0.33%
1.16%
1
0
1
100
122
28
4.464
125
0
0
0
0.17%
0.05%
0.40%
0
0
1
200
122
28
4.464
125
0
0
0
0.01%
0.00%
0.05%
0
0
0
600
122
28
4.464
125
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 45 of 114
December 2016

-------
C.3-CA Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR
2 MRs Predicted
to have Any
Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted
to have Any
Detects Exceeding
Threshold 
National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
20,826,415
40,196,393
0.518
20,826,415
18,997,326
17,947,557
19,781,308
91.22%
86.18%
94.98%
18,997,326
17,947,557
19,781,308
20,826,415
40,196,393
0.518
20,826,415
13,821,034
12,872,788
14,896,681
66.36%
61.81%
71.53%
13,821,034
12,872,788
14,896,681
20,826,415
40,196,393
0.518
20,826,415
6,037,570
5,326,657
6,840,463
28.99%
25.58%
32.85%
6,037,570
5,326,657
6,840,463
20,826,415
40,196,393
0.518
20,826,415
3,247,733
2,762,698
3,824,753
15.59%
13.27%
18.36%
3,247,733
2,762,698
3,824,753
20,826,415
40,196,393
0.518
20,826,415
1,183,600
927,931
1,447,759
5.68%
4.46%
6.95%
1,183,600
927,931
1,447,759
20,826,415
40,196,393
0.518
20,826,415
151,475
86,422
247,417
0.73%
0.41%
1.19%
151,475
86,422
247,417
20,826,415
40,196,393
0.518
20,826,415
51,723
21,969
93,091
0.25%
0.11%
0.45%
51,723
21,969
93,091
20,826,415
40,196,393
0.518
20,826,415
10,411
1,562
26,773
0.05%
0.01%
0.13%
10,411
1,562
26,773
20,826,415
40,196,393
0.518
20,826,415
246
4
990
0.00%
0.00%
0.00%
246
4
990
15,577,337
30,089,884
0.518
15,577,337
14,544,668
13,983,693
14,983,183
93.37%
89.77%
96.19%
14,544,668
13,983,693
14,983,183
15,577,337
30,089,884
0.518
15,577,337
10,995,621
10,418,621
11,587,179
70.59%
66.88%
74.38%
10,995,621
10,418,621
11,587,179
15,577,337
30,089,884
0.518
15,577,337
4,943,742
4,482,642
5,456,284
31.74%
28.78%
35.03%
4,943,742
4,482,642
5,456,284
15,577,337
30,089,884
0.518
15,577,337
2,675,779
2,336,315
3,033,933
17.18%
15.00%
19.48%
2,675,779
2,336,315
3,033,933
15,577,337
30,089,884
0.518
15,577,337
964,598
763,170
1,146,564
6.19%
4.90%
7.36%
964,598
763,170
1,146,564
15,577,337
30,089,884
0.518
15,577,337
120,630
71,608
193,791
0.77%
0.46%
1.24%
120,630
71,608
193,791
15,577,337
30,089,884
0.518
15,577,337
44,218
19,713
74,857
0.28%
0.13%
0.48%
44,218
19,713
74,857
15,577,337
30,089,884
0.518
15,577,337
9,817
1,477
24,712
0.06%
0.01%
0.16%
9,817
1,477
24,712
15,577,337
30,089,884
0.518
15,577,337
243
4
978
0.00%
0.00%
0.01%
243
4
978
2,384,287
5,268,728
0.453
2,384,287
1,969,773
1,633,971
2,179,000
82.61%
68.53%
91.39%
1,969,773
1,633,971
2,179,000
2,384,287
5,268,728
0.453
2,384,287
1,113,869
855,597
1,466,564
46.72%
35.88%
61.51%
1,113,869
855,597
1,466,564
2,384,287
5,268,728
0.453
2,384,287
303,784
143,987
506,051
12.74%
6.04%
21.22%
303,784
143,987
506,051
2,384,287
5,268,728
0.453
2,384,287
110,634
35,110
246,998
4.64%
1.47%
10.36%
110,634
35,110
246,998
2,384,287
5,268,728
0.453
2,384,287
17,076
2,425
55,132
0.72%
0.10%
2.31%
17,076
2,425
55,132
2,384,287
5,268,728
0.453
2,384,287
257
6
1,036
0.01%
0.00%
0.04%
257
6
1,036
2,384,287
5,268,728
0.453
2,384,287
21
0
77
0.00%
0.00%
0.00%
21
0
77
2,384,287
5,268,728
0.453
2,384,287
0
0
1
0.00%
0.00%
0.00%
0
0
1
2,384,287
5,268,728
0.453
2,384,287
0
0
0
0.00%
0.00%
0.00%
0
0
0
2,864,791
4,837,781
0.592
2,864,791
2,482,885
2,329,894
2,619,125
86.67%
81.33%
91.42%
2,482,885
2,329,894
2,619,125
2,864,791
4,837,781
0.592
2,864,791
1,711,544
1,598,570
1,842,938
59.74%
55.80%
64.33%
1,711,544
1,598,570
1,842,938
2,864,791
4,837,781
0.592
2,864,791
790,044
700,029
878,128
27.58%
24.44%
30.65%
790,044
700,029
878,128
2,864,791
4,837,781
0.592
2,864,791
461,320
391,273
543,823
16.10%
13.66%
18.98%
461,320
391,273
543,823
2,864,791
4,837,781
0.592
2,864,791
201,926
162,336
246,063
7.05%
5.67%
8.59%
201,926
162,336
246,063
2,864,791
4,837,781
0.592
2,864,791
30,588
14,808
52,590
1.07%
0.52%
1.84%
30,588
14,808
52,590
2,864,791
4,837,781
0.592
2,864,791
7,483
2,255
18,156
0.26%
0.08%
0.63%
7,483
2,255
18,156
2,864,791
4,837,781
0.592
2,864,791
594
84
2,060
0.02%
0.00%
0.07%
594
84
2,060
2,864,791
4,837,781
0.592
2,864,791
3
0
12
0.00%
0.00%
0.00%
3
0
12
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 46 of 114
December 2016

-------
C.3-CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All EPs Only
0.6
572
1,412
2.159
3,049
323
287
362
56.50%
50.16%
63.26%
1,968
1,606
2,381
2
572
1,412
2.159
3,049
179
161
199
31.25%
28.16%
34.72%
1,228
988
1,500
6
572
1,412
2.159
3,049
78
68
88
13.64%
11.94%
15.47%
629
513
778
10
572
1,412
2.159
3,049
48
40
56
8.32%
7.06%
9.74%
421
331
529
20
572
1,412
2.159
3,049
23
18
28
3.94%
3.08%
4.89%
220
156
297
60
572
1,412
2.159
3,049
5
3
8
0.87%
0.46%
1.37%
52
20
97
100
572
1,412
2.159
3,049
2
1
4
0.36%
0.12%
0.66%
20
5
48
200
572
1,412
2.159
3,049
0
0
1
0.08%
0.01%
0.22%
4
0
13
600
572
1,412
2.159
3,049
0
0
0
0.00%
0.00%
0.01%
0
0
0
EPs Only at Surface
Water Systems
0.6
201
392
1.388
545
136
124
149
67.87%
61.93%
74.20%
393
353
435
2
201
392
1.388
545
85
78
92
42.22%
39.01%
45.74%
272
249
297
6
201
392
1.388
545
43
39
48
21.47%
19.38%
23.67%
161
143
179
10
201
392
1.388
545
28
25
32
14.02%
12.24%
15.95%
114
98
130
20
201
392
1.388
545
14
12
17
7.17%
5.83%
8.59%
66
54
79
60
201
392
1.388
545
4
2
6
1.92%
1.12%
2.83%
21
13
30
100
201
392
1.388
545
2
1
3
0.87%
0.30%
1.51%
10
4
17
200
201
392
1.388
545
0
0
1
0.21%
0.03%
0.57%
3
0
7
600
201
392
1.388
545
0
0
0
0.01%
0.00%
0.03%
0
0
0
EPs Only at Ground
Water Systems
0.6
103
665
1.437
955
28
18
40
27.16%
17.73%
38.50%
362
201
584
2
103
665
1.437
955
10
6
14
9.23%
5.81%
13.46%
132
40
244
6
103
665
1.437
955
2
1
4
2.08%
0.84%
3.72%
25
5
73
10
103
665
1.437
955
1
0
2
0.80%
0.19%
1.82%
9
1
28
20
103
665
1.437
955
0
0
0
0.15%
0.01%
0.48%
1
0
5
60
103
665
1.437
955
0
0
0
0.00%
0.00%
0.02%
0
0
0
100
103
665
1.437
955
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
103
665
1.437
955
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
103
665
1.437
955
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
268
355
4.360
1,550
159
144
173
59.24%
53.79%
64.57%
1,213
1,052
1,361
2
268
355
4.360
1,550
84
77
93
31.47%
28.62%
34.63%
825
700
959
6
268
355
4.360
1,550
33
28
37
12.20%
10.63%
13.83%
443
365
525
10
268
355
4.360
1,550
19
16
22
6.94%
5.82%
8.13%
299
232
371
20
268
355
4.360
1,550
8
6
10
2.98%
2.19%
3.80%
152
102
214
60
268
355
4.360
1,550
1
0
2
0.42%
0.15%
0.79%
31
7
66
100
268
355
4.360
1,550
0
0
1
0.11%
0.02%
0.28%
10
1
31
200
268
355
4.360
1,550
0
0
0
0.01%
0.00%
0.04%
1
0
6
600
268
355
4.360
1,550
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 47 of 114
December 2016

-------
C.3-CA Only
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR
2 EPs Predicted
to have Any
Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted
to have Any
Detects Exceeding
Threshold 
National
Extrapolation
90% CI on Percent of Population
Served by EPs Predicted to have Any
Detects Exceeding Threshold -
National Extrapolation
Total Population
Served by EPs
with Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Population Served by EPs
with Any Detects Exceeding Threshold
- National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
26,842,981
54,813,206
0.613
33,606,834
15,526,034
13,427,170
17,852,281
57.84%
50.02%
66.51%
19,962,533
17,073,354
23,034,053
26,842,981
54,813,206
0.613
33,606,834
8,089,785
7,119,334
9,255,102
30.14%
26.52%
34.48%
10,771,145
9,314,681
12,515,652
26,842,981
54,813,206
0.613
33,606,834
3,471,872
3,061,383
3,930,735
12.93%
11.40%
14.64%
4,755,473
4,096,196
5,509,257
26,842,981
54,813,206
0.613
33,606,834
2,141,912
1,829,754
2,527,691
7.98%
6.82%
9.42%
2,981,456
2,451,014
3,584,542
26,842,981
54,813,206
0.613
33,606,834
982,681
749,889
1,236,362
3.66%
2.79%
4.61%
1,398,503
1,005,182
1,858,176
26,842,981
54,813,206
0.613
33,606,834
171,829
84,465
303,000
0.64%
0.31%
1.13%
255,440
120,794
463,957
26,842,981
54,813,206
0.613
33,606,834
58,957
19,661
121,980
0.22%
0.07%
0.45%
90,188
29,110
188,150
26,842,981
54,813,206
0.613
33,606,834
10,118
1,384
27,319
0.04%
0.01%
0.10%
16,390
2,213
44,437
26,842,981
54,813,206
0.613
33,606,834
229
5
994
0.00%
0.00%
0.00%
422
9
1,790
18,165,392
36,529,231
0.564
20,617,471
11,359,855
10,025,261
12,731,572
62.54%
55.19%
70.09%
13,160,170
11,610,326
14,726,574
18,165,392
36,529,231
0.564
20,617,471
6,032,880
5,383,079
6,749,470
33.21%
29.63%
37.16%
7,244,921
6,448,766
8,108,776
18,165,392
36,529,231
0.564
20,617,471
2,642,794
2,388,634
2,915,214
14.55%
13.15%
16.05%
3,314,664
2,971,889
3,687,048
18,165,392
36,529,231
0.564
20,617,471
1,645,178
1,434,068
1,887,073
9.06%
7.89%
10.39%
2,107,219
1,826,403
2,430,577
18,165,392
36,529,231
0.564
20,617,471
760,625
588,351
942,166
4.19%
3.24%
5.19%
1,016,001
788,109
1,255,221
18,165,392
36,529,231
0.564
20,617,471
144,241
73,103
253,792
0.79%
0.40%
1.40%
209,532
106,875
360,932
18,165,392
36,529,231
0.564
20,617,471
52,637
17,921
108,113
0.29%
0.10%
0.60%
79,079
27,007
158,061
18,165,392
36,529,231
0.564
20,617,471
9,613
1,311
25,866
0.05%
0.01%
0.14%
15,350
2,126
40,791
18,165,392
36,529,231
0.564
20,617,471
226
5
983
0.00%
0.00%
0.01%
413
9
1,751
3,459,172
9,969,990
0.534
5,327,725
1,052,807
598,877
1,704,179
30.44%
17.31%
49.27%
1,814,585
1,119,555
2,731,628
3,459,172
9,969,990
0.534
5,327,725
355,901
210,600
628,554
10.29%
6.09%
18.17%
672,305
410,227
1,096,026
3,459,172
9,969,990
0.534
5,327,725
78,677
25,400
153,044
2.27%
0.73%
4.42%
157,812
56,361
303,280
3,459,172
9,969,990
0.534
5,327,725
29,382
5,520
77,398
0.85%
0.16%
2.24%
60,720
13,572
147,531
3,459,172
9,969,990
0.534
5,327,725
5,286
388
19,702
0.15%
0.01%
0.57%
11,542
1,039
38,626
3,459,172
9,969,990
0.534
5,327,725
133

602
0.00%
0.00%
0.02%
336
3
1,432
3,459,172
9,969,990
0.534
5,327,725
17
0
64
0.00%
0.00%
0.00%
46
0
166
3,459,172
9,969,990
0.534
5,327,725
1
0
2
0.00%
0.00%
0.00%
2
0
5
3,459,172
9,969,990
0.534
5,327,725
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,218,417
8,313,985
0.922
7,661,638
3,113,372
2,803,032
3,416,531
59.66%
53.71%
65.47%
4,987,779
4,343,473
5,575,851
5,218,417
8,313,985
0.922
7,661,638
1,701,003
1,525,655
1,877,079
32.60%
29.24%
35.97%
2,853,919
2,455,688
3,310,850
5,218,417
8,313,985
0.922
7,661,638
750,400
647,349
862,476
14.38%
12.41%
16.53%
1,282,997
1,067,946
1,518,929
5,218,417
8,313,985
0.922
7,661,638
467,353
390,166
563,221
8.96%
7.48%
10.79%
813,517
611,039
1,006,434
5,218,417
8,313,985
0.922
7,661,638
216,770
161,150
274,493
4.15%
3.09%
5.26%
370,960
216,034
564,329
5,218,417
8,313,985
0.922
7,661,638
27,455
11,361
48,606
0.53%
0.22%
0.93%
45,572
13,916
101,594
5,218,417
8,313,985
0.922
7,661,638
6,304
1,739
13,803
0.12%
0.03%
0.26%
11,062
2,103
29,923
5,218,417
8,313,985
0.922
7,661,638
504
72
1,450
0.01%
0.00%
0.03%
1,037
87
3,641
5,218,417
8,313,985
0.922
7,661,638
3
0
11
0.00%
0.00%
0.00%
8
0
38
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 48 of 114
December 2016

-------
C.3-CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All MRs Only
0.6
409
1,412
1.885
2,662
339
319
359
82.94%
77.97%
87.66%
1,656
1,421
1,885
2
409
1,412
1.885
2,662
246
230
264
60.24%
56.33%
64.59%
1,174
1,019
1,367
6
409
1,412
1.885
2,662
118
106
131
28.93%
25.86%
32.00%
626
498
764
10
409
1,412
1.885
2,662
69
60
79
16.97%
14.66%
19.38%
411
323
521
20
409
1,412
1.885
2,662
30
24
36
7.34%
5.95%
8.82%
223
175
284
60
409
1,412
1.885
2,662
7
5
9
1.65%
1.11%
2.29%
104
77
124
100
409
1,412
1.885
2,662
3
2
5
0.81%
0.39%
1.27%
71
37
100
200
409
1,412
1.885
2,662
1
0
2
0.25%
0.05%
0.55%
28
7
57
600
409
1,412
1.885
2,662
0
0
0
0.01%
0.00%
0.05%
2
0
7
MRs Only at
Surface Water
Systems
0.6
196
392
1.283
503
175
169
180
89.29%
86.45%
91.61%
478
459
492
2
196
392
1.283
503
140
134
146
71.60%
68.54%
74.68%
384
362
405
6
196
392
1.283
503
75
69
80
38.20%
35.34%
41.07%
220
202
238
10
196
392
1.283
503
46
41
51
23.48%
21.03%
25.91%
147
130
163
20
196
392
1.283
503
20
17
24
10.42%
8.66%
12.19%
73
59
86
60
196
392
1.283
503
4
3
6
2.07%
1.40%
2.92%
15
9
22
100
196
392
1.283
503
2
1
3
0.91%
0.41%
1.44%
6
3
10
200
196
392
1.283
503
0
0
1
0.23%
0.04%
0.56%
1
0
3
600
196
392
1.283
503
0
0
0
0.01%
0.00%
0.03%
0
0
0
MRs Only at
Ground Water
Systems
0.6
54
665
1.347
895
40
33
49
74.90%
60.85%
90.47%
492
362
638
2
54
665
1.347
895
20
16
25
36.91%
29.11%
46.65%
274
196
375
6
54
665
1.347
895
6
3
8
10.39%
5.88%
15.34%
93
34
162
10
54
665
1.347
895
2
1
4
4.17%
1.66%
7.35%
40
9
88
20
54
665
1.347
895
0
0
1
0.81%
0.15%
2.02%
8
1
25
60
54
665
1.347
895
0
0
0
0.02%
0.00%
0.09%
0
0
1
100
54
665
1.347
895
0
0
0
0.00%
0.00%
0.01%
0
0
0
200
54
665
1.347
895
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
54
665
1.347
895
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
159
355
3.555
1,264
124
117
130
77.84%
73.34%
81.84%
686
601
755
2
159
355
3.555
1,264
86
80
93
54.17%
50.52%
58.24%
517
461
586
6
159
355
3.555
1,264
38
33
42
23.78%
20.97%
26.48%
313
261
364
10
159
355
3.555
1,264
21
18
25
13.30%
11.23%
15.41%
224
184
269
20
159
355
3.555
1,264
9
7
11
5.76%
4.56%
6.98%
143
115
173
60
159
355
3.555
1,264
3
2
4
1.68%
1.13%
2.25%
89
68
101
100
159
355
3.555
1,264
2
1
2
0.97%
0.48%
1.48%
65
34
90
200
159
355
3.555
1,264
1
0
1
0.35%
0.08%
0.73%
26
6
54
600
159
355
3.555
1,264
0
0
0
0.02%
0.00%
0.08%
2
0
7
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 49 of 114
December 2016

-------
C.3-CA Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR
2 MRs Predicted
to have Any
Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted
to have Any
Detects Exceeding
Threshold 
National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
22,284,165
54,813,206
0.507
27,799,231
20,193,979
19,030,982
21,079,643
90.62%
85.40%
94.59%
24,821,851
23,199,140
26,112,210
22,284,165
54,813,206
0.507
27,799,231
14,670,186
13,635,868
15,841,126
65.83%
61.19%
71.09%
18,099,733
16,706,474
19,680,166
22,284,165
54,813,206
0.507
27,799,231
6,495,375
5,716,152
7,366,798
29.15%
25.65%
33.06%
8,467,214
7,360,475
9,679,735
22,284,165
54,813,206
0.507
27,799,231
3,542,322
2,997,527
4,180,770
15.90%
13.45%
18.76%
4,832,940
3,993,322
5,783,728
22,284,165
54,813,206
0.507
27,799,231
1,310,275
1,016,021
1,618,576
5.88%
4.56%
7.26%
1,875,135
1,385,593
2,415,254
22,284,165
54,813,206
0.507
27,799,231
169,533
94,956
280,073
0.76%
0.43%
1.26%
277,873
158,759
451,677
22,284,165
54,813,206
0.507
27,799,231
58,058
24,355
105,455
0.26%
0.11%
0.47%
112,483
49,808
192,767
22,284,165
54,813,206
0.507
27,799,231
11,844
1,822
30,182
0.05%
0.01%
0.14%
29,810
5,794
68,668
22,284,165
54,813,206
0.507
27,799,231
303
6
1,204
0.00%
0.00%
0.01%
1,338
43
5,037
16,389,136
36,529,231
0.513
18,722,421
15,314,419
14,715,571
15,780,059
93.44%
89.79%
96.28%
17,529,265
16,822,591
18,071,510
16,389,136
36,529,231
0.513
18,722,421
11,598,992
10,979,474
12,235,918
70.77%
66.99%
74.66%
13,345,130
12,604,380
14,110,890
16,389,136
36,529,231
0.513
18,722,421
5,283,287
4,785,960
5,830,726
32.24%
29.20%
35.58%
6,277,830
5,674,394
6,928,025
16,389,136
36,529,231
0.513
18,722,421
2,900,935
2,527,767
3,291,116
17.70%
15.42%
20.08%
3,567,451
3,096,454
4,052,000
16,389,136
36,529,231
0.513
18,722,421
1,067,743
841,648
1,274,608
6.51%
5.14%
7.78%
1,383,668
1,084,634
1,663,320
16,389,136
36,529,231
0.513
18,722,421
136,249
78,913
221,529
0.83%
0.48%
1.35%
190,966
107,209
313,976
16,389,136
36,529,231
0.513
18,722,421
49,337
21,517
85,234
0.30%
0.13%
0.52%
69,460
29,348
122,702
16,389,136
36,529,231
0.513
18,722,421
10,801
1,631
27,203
0.07%
0.01%
0.17%
15,221
2,352
38,123
16,389,136
36,529,231
0.513
18,722,421
271
5
1,082
0.00%
0.00%
0.01%
405
8
1,584
2,912,958
9,969,990
0.465
4,639,800
2,282,341
1,875,085
2,563,705
78.35%
64.37%
88.01%
3,325,828
2,667,864
3,865,841
2,912,958
9,969,990
0.465
4,639,800
1,254,845
958,812
1,651,288
43.08%
32.92%
56.69%
1,750,082
1,308,168
2,309,832
2,912,958
9,969,990
0.465
4,639,800
348,582
169,350
571,830
11.97%
5.81%
19.63%
508,861
249,100
827,375
2,912,958
9,969,990
0.465
4,639,800
131,404
43,719
283,477
4.51%
1.50%
9.73%
204,131
69,791
425,971
2,912,958
9,969,990
0.465
4,639,800
22,012
3,384
67,072
0.76%
0.12%
2.30%
38,579
6,223
110,229
2,912,958
9,969,990
0.465
4,639,800
426
11
1,657
0.01%
0.00%
0.06%
955
26
3,646
2,912,958
9,969,990
0.465
4,639,800
43
0
164
0.00%
0.00%
0.01%
109

431
2,912,958
9,969,990
0.465
4,639,800
1
0
4
0.00%
0.00%
0.00%
3
0
12
2,912,958
9,969,990
0.465
4,639,800
0
0
0
0.00%
0.00%
0.00%
0
0
0
2,982,071
8,313,985
0.534
4,437,010
2,597,220
2,440,325
2,735,879
87.09%
81.83%
91.74%
3,966,759
3,708,685
4,174,859
2,982,071
8,313,985
0.534
4,437,010
1,816,349
1,697,582
1,953,919
60.91%
56.93%
65.52%
3,004,520
2,793,925
3,259,443
2,982,071
8,313,985
0.534
4,437,010
863,507
760,842
964,242
28.96%
25.51%
32.33%
1,680,522
1,436,981
1,924,335
2,982,071
8,313,985
0.534
4,437,010
509,984
426,042
606,177
17.10%
14.29%
20.33%
1,061,358
827,077
1,305,757
2,982,071
8,313,985
0.534
4,437,010
220,520
170,989
276,896
7.39%
5.73%
9.29%
452,888
294,737
641,705
2,982,071
8,313,985
0.534
4,437,010
32,858
16,032
56,886
1.10%
0.54%
1.91%
85,951
51,523
134,055
2,982,071
8,313,985
0.534
4,437,010
8,678
2,838
20,057
0.29%
0.10%
0.67%
42,914
20,459
69,634
2,982,071
8,313,985
0.534
4,437,010
1,041
191
2,975
0.03%
0.01%
0.10%
14,585
3,442
30,533
2,982,071
8,313,985
0.534
4,437,010
32

121
0.00%
0.00%
0.00%
933
35
3,453
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 50 of 114
December 2016

-------
C.4-CA withCL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All EPs Only
0.6
27
1,252
1.256
1,573
21
18
24
51.35%
36.12%
70.80%
808
568
1,114
2
27
1,252
1.256
1,573
16
14
18
34.94%
29.07%
45.14%
550
457
710
6
27
1,252
1.256
1,573
10
9
12
22.64%
18.97%
27.21%
356
298
428
10
27
1,252
1.256
1,573
8
6
9
16.91%
13.15%
20.69%
266
207
325
20
27
1,252
1.256
1,573
4
3
6
8.81%
5.27%
12.54%
139
83
197
60
27
1,252
1.256
1,573
1
0
2
1.20%
0.33%
2.74%
19
5
43
100
27
1,252
1.256
1,573
0
0
1
0.32%
0.05%
0.90%
5
1
14
200
27
1,252
1.256
1,573
0
0
0
0.04%
0.00%
0.13%
1
0
2
600
27
1,252
1.256
1,573
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
14
125
1.000
125
13
12
14
91.93%
85.52%
98.70%
115
107
124
2
14
125
1.000
125
11
10
12
75.96%
69.01%
83.41%
95
86
104
6
14
125
1.000
125
7
6
8
47.45%
41.27%
54.51%
59
52
68
10
14
125
1.000
125
5
4
6
34.45%
29.27%
40.38%
43
37
51
20
14
125
1.000
125
3
2
3
20.14%
15.19%
24.97%
25
19
31
60
14
125
1.000
125
1
0
1
5.45%
2.29%
9.24%
7
3
12
100
14
125
1.000
125
0
0
1
2.05%
0.45%
4.60%
3
1
6
200
14
125
1.000
125
0
0
0
0.32%
0.02%
1.04%
0
0
1
600
14
125
1.000
125
0
0
0
0.01%
0.00%
0.02%
0
0
0
EPs Only at Ground
Water Systems
0.6
5
482
1.667
803
1
0
2
18.77%
0.42%
46.14%
151
3
370
2
5
482
1.667
803
0
0
1
3.38%
0.00%
14.13%
27
0
113
6
5
482
1.667
803
0
0
0
0.24%
0.00%
1.45%
2
0
12
10
5
482
1.667
803
0
0
0
0.04%
0.00%
0.27%
0
0
2
20
5
482
1.667
803
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
5
482
1.667
803
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
5
482
1.667
803
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
5
482
1.667
803
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
5
482
1.667
803
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
8
645
1.000
645
7
6
8
84.01%
70.96%
96.07%
542
458
620
2
8
645
1.000
645
5
5
6
66.25%
57.48%
76.30%
427
371
492
6
8
645
1.000
645
4
3
4
45.69%
38.25%
53.97%
295
247
348
10
8
645
1.000
645
3
2
3
34.49%
26.38%
42.28%
222
170
273
20
8
645
1.000
645
1
1
2
17.57%
9.90%
25.70%
113
64
166
60
8
645
1.000
645
0
0
0
1.88%
0.37%
4.90%
12
2
32
100
8
645
1.000
645
0
0
0
0.39%
0.04%
1.30%
2
0
8
200
8
645
1.000
645
0
0
0
0.03%
0.00%
0.12%
0
0
1
600
8
645
1.000
645
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 51 of 114
December 2016

-------
C.4-CA withCL-OT
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
42,674
2,356,537
0.290
683,695
35,361
31,512
39,579
64.20%
49.69%
81.02%
438,906
339,745
553,914
42,674
2,356,537
0.290
683,695
28,484
25,333
32,198
47.85%
41.23%
58.74%
327,180
281,853
401,619
42,674
2,356,537
0.290
683,695
17,006
13,534
20,588
30.85%
24.72%
37.04%
210,919
169,028
253,269
42,674
2,356,537
0.290
683,695
11,287
8,303
14,613
21.65%
14.65%
28.04%
148,041
100,189
191,715
42,674
2,356,537
0.290
683,695
5,445
3,664
7,743
9.92%
5.51%
15.86%
67,843
37,661
108,456
42,674
2,356,537
0.290
683,695
1,077
429
1,971
1.25%
0.41%
2.64%
8,567
2,832
18,021
42,674
2,356,537
0.290
683,695
370
86
839
0.35%
0.07%
0.86%
2,412
497
5,892
42,674
2,356,537
0.290
683,695
54
5
171
0.04%
0.00%
0.14%
302
25
978
42,674
2,356,537
0.290
683,695
1
0
3
0.00%
0.00%
0.00%
4
0
15
30,491
317,258
0.469
148,647
28,310
26,501
30,179
92.85%
86.91%
98.98%
138,015
129,196
147,127
30,491
317,258
0.469
148,647
23,437
21,068
25,712
76.86%
69.10%
84.33%
114,256
102,710
125,348
30,491
317,258
0.469
148,647
13,560
10,759
16,478
44.47%
35.29%
54.04%
66,107
52,451
80,331
30,491
317,258
0.469
148,647
8,782
6,695
11,369
28.80%
21.96%
37.29%
42,812
32,636
55,426
30,491
317,258
0.469
148,647
4,333
3,131
5,839
14.21%
10.27%
19.15%
21,123
15,262
28,466
30,491
317,258
0.469
148,647
988
409
1,744
3.24%
1.34%
5.72%
4,815
1,995
8,502
30,491
317,258
0.469
148,647
353
84
790
1.16%
0.27%
2.59%
1,722
407
3,852
30,491
317,258
0.469
148,647
53
5
167
0.18%
0.02%
0.55%
260
23
815
30,491
317,258
0.469
148,647
1
0
3
0.00%
0.00%
0.01%
4
0
15
5,303
405,603
0.607
246,072
1,072
16
2,714
20.22%
0.30%
51.19%
49,744
745
125,953
5,303
405,603
0.607
246,072
201
0
864
3.80%
0.00%
16.28%
9,345
3
40,072
5,303
405,603
0.607
246,072
15
0
60
0.29%
0.00%
1.13%
714
0
2,788
5,303
405,603
0.607
246,072
3
0
9
0.06%
0.00%
0.17%
142
0
429
5,303
405,603
0.607
246,072
0
0
0
0.00%
0.00%
0.01%
10
0
20
5,303
405,603
0.607
246,072
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,303
405,603
0.607
246,072
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,303
405,603
0.607
246,072
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,303
405,603
0.607
246,072
0
0
0
0.00%
0.00%
0.00%
0
0
0
6,879
1,633,675
0.177
288,975
5,979
4,995
6,685
86.91%
72.60%
97.18%
251,147
209,805
280,833
6,879
1,633,675
0.177
288,975
4,846
4,265
5,623
70.45%
61.99%
81.74%
203,579
179,140
236,199
6,879
1,633,675
0.177
288,975
3,430
2,775
4,051
49.87%
40.34%
58.88%
144,098
116,576
170,150
6,879
1,633,675
0.177
288,975
2,502
1,608
3,234
36.37%
23.38%
47.01%
105,087
67,553
135,861
6,879
1,633,675
0.177
288,975
1,112
533
1,904
16.16%
7.75%
27.67%
46,710
22,398
79,969
6,879
1,633,675
0.177
288,975
89
20
227
1.30%
0.29%
3.29%
3,751
837
9,518
6,879
1,633,675
0.177
288,975
16
2
49
0.24%
0.03%
0.71%
690
90
2,039
6,879
1,633,675
0.177
288,975
1
0
4
0.01%
0.00%
0.06%
42
2
163
6,879
1,633,675
0.177
288,975
0
0
0
0.00%
0.00%
0.00%
0
0
1
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 52 of 114
December 2016

-------
C.4-CA withCL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation



Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)

0.6
25
1,252
1.000
1,252
22
19
24
72.52%
52.11%
91.17%
908
652
1,141

2
25
1,252
1.000
1,252
18
16
20
48.84%
39.72%
62.48%
611
497
782

6
25
1,252
1.000
1,252
12
10
13
29.94%
23.98%
36.31%
375
300
454

10
25
1,252
1.000
1,252
9
7
10
20.57%
15.11%
26.29%
257
189
329
All MRs Only
20
25
1,252
1.000
1,252
5
4
6
8.87%
4.95%
13.97%
111
62
175

60
25
1,252
1.000
1,252
1
1
2
1.20%
0.49%
2.31%
15
6
29

100
25
1,252
1.000
1,252
0
0
1
0.38%
0.10%
0.81%
5
1
10

200
25
1,252
1.000
1,252
0
0
0
0.05%
0.01%
0.15%
1
0
2

600
25
1,252
1.000
1,252
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
14
125
1.000
125
13
12
14
95.71%
88.28%
99.85%
120
111
125

2
14
125
1.000
125
11
11
13
82.13%
75.75%
89.33%
103
95
112

6
14
125
1.000
125
8
7
9
56.73%
50.45%
63.09%
71
63
79
MRs Only at
10
14
125
1.000
125
6
5
7
42.73%
36.29%
48.80%
54
45
61
Surface Water
20
14
125
1.000
125
4
3
5
26.88%
22.73%
32.15%
34
28
40
Systems
60
14
125
1.000
125
1
1
2
8.84%
4.52%
13.52%
11
6
17

100
14
125
1.000
125
0
0
1
3.33%
0.98%
6.57%
4
1
8

200
14
125
1.000
125
0
0
0
0.48%
0.06%
1.47%
1
0
2

600
14
125
1.000
125
0
0
0
0.01%
0.00%
0.02%
0
0
0

0.6
3
482
1.000
482
1
0
2
43.26%
7.66%
78.45%
208
37
378

2
3
482
1.000
482
0
0
1
10.03%
0.10%
30.86%
48
0
149

6
3
482
1.000
482
0
0
0
0.80%
0.00%
3.73%
4
0
18
MRs Only at
10
3
482
1.000
482
0
0
0
0.16%
0.00%
0.71%
1
0
3
Ground Water
20
3
482
1.000
482
0
0
0
0.01%
0.00%
0.03%
0
0
0
Systems
60
3
482
1.000
482
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
482
1.000
482
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
482
1.000
482
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
482
1.000
482
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
8
645
1.000
645
7
6
8
89.87%
78.27%
98.99%
580
505
638

2
8
645
1.000
645
6
5
6
71.35%
62.32%
80.87%
460
402
522

6
8
645
1.000
645
4
3
4
46.51%
36.74%
55.44%
300
237
358
MRs Only at
10
8
645
1.000
645
3
2
3
31.51%
22.27%
41.02%
203
144
265
Mixed Water
20
8
645
1.000
645
1
0
2
11.99%
5.19%
20.85%
77
33
134
Systems
60
8
645
1.000
645
0
0
0
0.61%
0.07%
1.86%
4
0
12

100
8
645
1.000
645
0
0
0
0.08%
0.00%
0.29%
1
0
2

200
8
645
1.000
645
0
0
0
0.00%
0.00%
0.01%
0
0
0

600
8
645
1.000
645
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 53 of 114
December 2016

-------
C.4-CA withCL-OT
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
40,809
2,356,537
0.253
597,154
36,312
30,292
40,291
77.59%
53.91%
96.38%
463,321
321,901
575,516
40,809
2,356,537
0.253
597,154
29,234
26,171
34,092
53.70%
44.12%
72.90%
320,672
263,440
435,304
40,809
2,356,537
0.253
597,154
19,828
16,670
22,583
32.06%
24.55%
39.58%
191,460
146,608
236,383
40,809
2,356,537
0.253
597,154
14,163
10,793
17,657
21.34%
15.09%
28.58%
127,457
90,114
170,684
40,809
2,356,537
0.253
597,154
7,498
5,434
10,400
9.48%
5.86%
14.62%
56,614
34,974
87,275
40,809
2,356,537
0.253
597,154
1,907
953
3,104
1.71%
0.80%
2.98%
10,239
4,762
17,803
40,809
2,356,537
0.253
597,154
673
200
1,339
0.57%
0.16%
1.17%
3,406
980
6,964
40,809
2,356,537
0.253
597,154
91
12
263
0.07%
0.01%
0.22%
448
59
1,299
40,809
2,356,537
0.253
597,154
1
0
4
0.00%
0.00%
0.00%
5
0
19
30,491
317,258
0.469
148,647
28,781
25,617
30,441
94.39%
84.02%
99.84%
140,311
124,887
148,403
30,491
317,258
0.469
148,647
24,478
22,512
27,019
80.28%
73.83%
88.61%
119,334
109,750
131,720
30,491
317,258
0.469
148,647
17,278
14,910
19,200
56.66%
48.90%
62.97%
84,231
72,687
93,600
30,491
317,258
0.469
148,647
12,591
9,783
15,381
41.29%
32.08%
50.44%
61,382
47,691
74,983
30,491
317,258
0.469
148,647
6,958
5,205
9,415
22.82%
17.07%
30.88%
33,921
25,377
45,899
30,491
317,258
0.469
148,647
1,882
950
3,032
6.17%
3.11%
9.94%
9,173
4,630
14,780
30,491
317,258
0.469
148,647
670
199
1,327
2.20%
0.65%
4.35%
3,266
972
6,469
30,491
317,258
0.469
148,647
91
12
262
0.30%
0.04%
0.86%
443
59
1,278
30,491
317,258
0.469
148,647
1
0
4
0.00%
0.00%
0.01%
5
0
19
3,438
405,603
0.393
159,531
1,514
148
3,036
44.03%
4.30%
88.32%
70,238
6,866
140,891
3,438
405,603
0.393
159,531
357
2
1,472
10.38%
0.06%
42.82%
16,563
93
68,311
3,438
405,603
0.393
159,531
28
0
149
0.82%
0.00%
4.35%
1,316
0
6,934
3,438
405,603
0.393
159,531
6
0
24
0.16%
0.00%
0.71%
255
0
1,128
3,438
405,603
0.393
159,531
0
0
1
0.01%
0.00%
0.03%
17
0
56
3,438
405,603
0.393
159,531
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,438
405,603
0.393
159,531
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,438
405,603
0.393
159,531
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,438
405,603
0.393
159,531
0
0
0
0.00%
0.00%
0.00%
0
0
0
6,879
1,633,675
0.177
288,975
6,017
4,527
6,814
87.47%
65.80%
99.05%
252,771
190,148
286,221
6,879
1,633,675
0.177
288,975
4,399
3,656
5,601
63.94%
53.15%
81.42%
184,775
153,597
235,272
6,879
1,633,675
0.177
288,975
2,521
1,760
3,234
36.65%
25.58%
47.01%
105,913
73,921
135,850
6,879
1,633,675
0.177
288,975
1,567
1,010
2,251
22.78%
14.68%
32.73%
65,820
42,422
94,574
6,879
1,633,675
0.177
288,975
540
228
984
7.85%
3.32%
14.30%
22,677
9,597
41,320
6,879
1,633,675
0.177
288,975
25
3
72
0.37%
0.05%
1.05%
1,067
132
3,023
6,879
1,633,675
0.177
288,975
3
0
12
0.05%
0.00%
0.17%
140
8
495
6,879
1,633,675
0.177
288,975
0
0
0
0.00%
0.00%
0.01%
5
0
21
6,879
1,633,675
0.177
288,975
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 54 of 114
December 2016

-------
C.4-CA withCL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
All EPs Only
0.6
12
149
1.432
213
5
2
8
41.60%
23.75%
63.50%
88
51
135
2
12
149
1.432
213
2
1
4
18.84%
10.77%
29.36%
40
23
62
6
12
149
1.432
213
1
0
1
6.17%
2.24%
10.54%
13
5
22
10
12
149
1.432
213
0
0
1
2.55%
0.46%
6.15%
5
1
13
20
12
149
1.432
213
0
0
0
0.44%
0.03%
1.47%
1
0
3
60
12
149
1.432
213
0
0
0
0.01%
0.00%
0.03%
0
0
0
100
12
149
1.432
213
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
12
149
1.432
213
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
12
149
1.432
213
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
2
12
1.000
12
1
0
2
42.87%
1.15%
90.39%
5
0
11
2
2
12
1.000
12
0
0
1
10.06%
0.00%
38.92%
1
0
5
6
2
12
1.000
12
0
0
0
0.71%
0.00%
3.87%
0
0
0
10
2
12
1.000
12
0
0
0
0.12%
0.00%
0.62%
0
0
0
20
2
12
1.000
12
0
0
0
0.01%
0.00%
0.03%
0
0
0
60
2
12
1.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
2
12
1.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
2
12
1.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
2
12
1.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
1
8
1.000
8
0
0
1
22.19%
0.00%
90.62%
2
0
7
2
1
8
1.000
8
0
0
0
4.41%
0.00%
26.69%
0
0
2
6
1
8
1.000
8
0
0
0
0.35%
0.00%
1.27%
0
0
0
10
1
8
1.000
8
0
0
0
0.07%
0.00%
0.16%
0
0
0
20
1
8
1.000
8
0
0
0
0.01%
0.00%
0.01%
0
0
0
60
1
8
1.000
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
8
1.000
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
8
1.000
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
8
1.000
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
9
128
1.500
193
4
2
5
42.31%
26.16%
60.69%
82
50
117
2
9
128
1.500
193
2
1
3
19.99%
11.89%
28.87%
39
23
56
6
9
128
1.500
193
1
0
1
6.76%
2.47%
11.35%
13
5
22
10
9
128
1.500
193
0
0
1
2.80%
0.51%
6.75%
5
1
13
20
9
128
1.500
193
0
0
0
0.49%
0.03%
1.62%
1
0
3
60
9
128
1.500
193
0
0
0
0.01%
0.00%
0.03%
0
0
0
100
9
128
1.500
193
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
9
128
1.500
193
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
9
128
1.500
193
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 55 of 114
December 2016

-------
C.4-CA withCL-OT
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
108,220
4,908,058
0.259
1,271,264
46,324
20,020
85,514
48.24%
27.03%
73.06%
613,315
343,600
928,839
108,220
4,908,058
0.259
1,271,264
19,983
11,347
41,364
23.81%
15.43%
39.22%
302,639
196,176
498,562
108,220
4,908,058
0.259
1,271,264
6,599
2,194
11,836
8.72%
2.98%
14.82%
110,827
37,941
188,380
108,220
4,908,058
0.259
1,271,264
2,750
438
6,765
3.69%
0.60%
8.99%
46,937
7,579
114,269
108,220
4,908,058
0.259
1,271,264
480
27
1,618
0.65%
0.04%
2.19%
8,261
459
27,861
108,220
4,908,058
0.259
1,271,264
8
0
31
0.01%
0.00%
0.04%
147

533
108,220
4,908,058
0.259
1,271,264
1
0
3
0.00%
0.00%
0.00%
14
0
46
108,220
4,908,058
0.259
1,271,264
0
0
0
0.00%
0.00%
0.00%
0
0
1
108,220
4,908,058
0.259
1,271,264
0
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
408,139
0.319
130,258
9,702
224
20,670
43.66%
1.01%
93.02%
56,872
1,312
121,172
22,220
408,139
0.319
130,258
2,415
1
10,876
10.87%
0.00%
48.95%
14,160
5
63,758
22,220
408,139
0.319
130,258
178
0
1,040
0.80%
0.00%
4.68%
1,045
0
6,095
22,220
408,139
0.319
130,258
31
0
188
0.14%
0.00%
0.85%
182
0
1,101
22,220
408,139
0.319
130,258
2
0
9
0.01%
0.00%
0.04%
10
0
51
22,220
408,139
0.319
130,258
0
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
408,139
0.319
130,258
0
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
408,139
0.319
130,258
0
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
408,139
0.319
130,258
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
204,555
0.500
102,278
5,753
0
23,492
22.19%
0.00%
90.62%
22,697
0
92,682
25,924
204,555
0.500
102,278
1,144
0
6,919
4.41%
0.00%
26.69%
4,514
0
27,298
25,924
204,555
0.500
102,278
92
0
329
0.35%
0.00%
1.27%
363
0
1,298
25,924
204,555
0.500
102,278
19
0
42
0.07%
0.00%
0.16%
76
0
166
25,924
204,555
0.500
102,278
1
0
2
0.01%
0.00%
0.01%
6
0
6
25,924
204,555
0.500
102,278
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
204,555
0.500
102,278
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
204,555
0.500
102,278
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
204,555
0.500
102,278
0
0
0
0.00%
0.00%
0.00%
0
0
0
60,076
4,295,363
0.242
1,038,728
30,870
19,797
41,352
51.38%
32.95%
68.83%
533,746
342,288
714,986
60,076
4,295,363
0.242
1,038,728
16,424
11,346
23,569
27.34%
18.89%
39.23%
283,965
196,171
407,506
60,076
4,295,363
0.242
1,038,728
6,328
2,194
10,468
10.53%
3.65%
17.42%
109,419
37,941
180,987
60,076
4,295,363
0.242
1,038,728
2,700
438
6,536
4.49%
0.73%
10.88%
46,679
7,579
113,002
60,076
4,295,363
0.242
1,038,728
477
27
1,608
0.79%
0.04%
2.68%
8,246
459
27,804
60,076
4,295,363
0.242
1,038,728
8
0
31
0.01%
0.00%
0.05%
147

533
60,076
4,295,363
0.242
1,038,728
1
0
3
0.00%
0.00%
0.00%
14
0
46
60,076
4,295,363
0.242
1,038,728
0
0
0
0.00%
0.00%
0.00%
0
0
1
60,076
4,295,363
0.242
1,038,728
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 56 of 114
December 2016

-------
C.4-CA withCL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation



Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)

0.6
12
149
1.432
213
10
8
12
85.92%
70.15%
98.64%
183
149
210

2
12
149
1.432
213
5
3
8
47.45%
33.41%
64.06%
101
71
136

6
12
149
1.432
213
1
1
2
12.04%
5.68%
19.43%
26
12
41

10
12
149
1.432
213
0
0
1
4.30%
1.16%
8.55%
9
2
18
All MRs Only
20
12
149
1.432
213
0
0
0
0.62%
0.06%
1.98%
1
0
4

60
12
149
1.432
213
0
0
0
0.01%
0.00%
0.03%
0
0
0

100
12
149
1.432
213
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
12
149
1.432
213
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
12
149
1.432
213
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
2
12
1.000
12
2
1
2
84.67%
51.16%
99.93%
10
6
12

2
2
12
1.000
12
1
0
1
40.98%
10.71%
72.89%
5
1
9

6
2
12
1.000
12
0
0
0
5.17%
0.14%
16.07%
1
0
2
MRs Only at
10
2
12
1.000
12
0
0
0
1.05%
0.01%
4.02%
0
0
0
Surface Water
20
2
12
1.000
12
0
0
0
0.06%
0.00%
0.27%
0
0
0
Systems
60
2
12
1.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
2
12
1.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
2
12
1.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
2
12
1.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
8
1.000
8
0
0
1
43.70%
0.05%
98.30%
3
0
8

2
1
8
1.000
8
0
0
0
9.84%
0.00%
47.85%
1
0
4

6
1
8
1.000
8
0
0
0
0.82%
0.00%
3.11%
0
0
0
MRs Only at
10
1
8
1.000
8
0
0
0
0.18%
0.00%
0.40%
0
0
0
Ground Water
20
1
8
1.000
8
0
0
0
0.02%
0.00%
0.01%
0
0
0
Systems
60
1
8
1.000
8
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
8
1.000
8
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
8
1.000
8
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
8
1.000
8
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
9
128
1.500
193
8
7
9
87.73%
74.23%
98.58%
169
143
190

2
9
128
1.500
193
4
3
6
49.41%
36.22%
64.17%
95
70
124

6
9
128
1.500
193
1
1
2
12.93%
6.26%
20.31%
25
12
39
MRs Only at
10
9
128
1.500
193
0
0
1
4.68%
1.28%
9.17%
9
2
18
Mixed Water
20
9
128
1.500
193
0
0
0
0.67%
0.06%
2.17%
1
0
4
Systems
60
9
128
1.500
193
0
0
0
0.01%
0.00%
0.03%
0
0
0

100
9
128
1.500
193
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
9
128
1.500
193
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
9
128
1.500
193
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 57 of 114
December 2016

-------
C.4-CA withCL-OT
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
103,040
4,908,058
0.241
1,181,687
77,789
49,146
101,956
84.09%
65.43%
98.93%
993,720
773,219
1,168,993
103,040
4,908,058
0.241
1,181,687
40,333
25,361
67,276
49.26%
35.50%
68.41%
582,069
419,511
808,451
103,040
4,908,058
0.241
1,181,687
10,883
4,112
18,552
14.94%
6.00%
23.86%
176,562
70,870
281,972
103,040
4,908,058
0.241
1,181,687
4,126
815
9,048
5.84%
1.19%
12.60%
69,002
14,075
148,841
103,040
4,908,058
0.241
1,181,687
627
43
2,177
0.90%
0.06%
3.15%
10,693
738
37,196
103,040
4,908,058
0.241
1,181,687
7
0
32
0.01%
0.00%
0.05%
121

547
103,040
4,908,058
0.241
1,181,687
0
0
2
0.00%
0.00%
0.00%
8
0
37
103,040
4,908,058
0.241
1,181,687
0
0
0
0.00%
0.00%
0.00%
0
0
0
103,040
4,908,058
0.241
1,181,687
0
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
408,139
0.319
130,258
17,508
6,681
22,206
78.79%
30.07%
99.94%
102,635
39,163
130,176
22,220
408,139
0.319
130,258
7,110
1,662
16,559
32.00%
7.48%
74.52%
41,682
9,741
97,070
22,220
408,139
0.319
130,258
768
20
2,453
3.45%
0.09%
11.04%
4,500
118
14,380
22,220
408,139
0.319
130,258
149
1
544
0.67%
0.01%
2.45%
873
7
3,188
22,220
408,139
0.319
130,258
9
0
35
0.04%
0.00%
0.16%
50
0
203
22,220
408,139
0.319
130,258
0
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
408,139
0.319
130,258
0
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
408,139
0.319
130,258
0
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
408,139
0.319
130,258
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
204,555
0.500
102,278
11,329
14
25,483
43.70%
0.05%
98.30%
44,695
54
100,538
25,924
204,555
0.500
102,278
2,551
0
12,404
9.84%
0.00%
47.85%
10,065
0
48,937
25,924
204,555
0.500
102,278
213
0
806
0.82%
0.00%
3.11%
840
0
3,182
25,924
204,555
0.500
102,278
47
0
104
0.18%
0.00%
0.40%
186
0
409
25,924
204,555
0.500
102,278
4
0
3
0.02%
0.00%
0.01%
16
0
13
25,924
204,555
0.500
102,278
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
204,555
0.500
102,278
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
204,555
0.500
102,278
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
204,555
0.500
102,278
0
0
0
0.00%
0.00%
0.00%
0
0
0
54,895
4,295,363
0.221
949,152
48,952
42,452
54,267
89.17%
77.33%
98.85%
846,390
734,002
938,279
54,895
4,295,363
0.221
949,152
30,672
23,700
38,313
55.87%
43.17%
69.79%
530,322
409,770
662,444
54,895
4,295,363
0.221
949,152
9,903
4,092
15,293
18.04%
7.45%
27.86%
171,222
70,751
264,410
54,895
4,295,363
0.221
949,152
3,930
814
8,400
7.16%
1.48%
15.30%
67,943
14,067
145,244
54,895
4,295,363
0.221
949,152
615
43
2,139
1.12%
0.08%
3.90%
10,627
738
36,980
54,895
4,295,363
0.221
949,152
7
0
32
0.01%
0.00%
0.06%
121

547
54,895
4,295,363
0.221
949,152
0
0
2
0.00%
0.00%
0.00%
8
0
37
54,895
4,295,363
0.221
949,152
0
0
0
0.00%
0.00%
0.00%
0
0
0
54,895
4,295,363
0.221
949,152
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 58 of 114
December 2016

-------
C.4-CA withCL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All EPs Only
0.6
56
45
1.244
56
29
22
37
51.60%
39.48%
65.67%
29
22
37
2
56
45
1.244
56
14
11
18
25.05%
19.37%
32.41%
14
11
18
6
56
45
1.244
56
4
3
6
7.66%
4.98%
10.77%
4
3
6
10
56
45
1.244
56
2
1
3
3.48%
1.78%
5.44%
2
1
3
20
56
45
1.244
56
1
0
1
0.94%
0.23%
1.99%
1
0
1
60
56
45
1.244
56
0
0
0
0.05%
0.00%
0.20%
0
0
0
100
56
45
1.244
56
0
0
0
0.01%
0.00%
0.04%
0
0
0
200
56
45
1.244
56
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
56
45
1.244
56
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
25
17
1.471
25
12
8
15
46.73%
33.87%
60.76%
12
8
15
2
25
17
1.471
25
5
4
7
21.27%
16.01%
27.26%
5
4
7
6
25
17
1.471
25
2
1
3
7.61%
5.35%
10.27%
2
1
3
10
25
17
1.471
25
1
1
2
4.31%
2.43%
6.18%
1
1
2
20
25
17
1.471
25
0
0
1
1.57%
0.39%
3.20%
0
0
1
60
25
17
1.471
25
0
0
0
0.11%
0.00%
0.42%
0
0
0
100
25
17
1.471
25
0
0
0
0.02%
0.00%
0.08%
0
0
0
200
25
17
1.471
25
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
25
17
1.471
25
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
8
4
2.000
8
1
0
3
16.50%
1.06%
37.80%
1
0
3
2
8
4
2.000
8
0
0
1
2.92%
0.01%
11.41%
0
0
1
6
8
4
2.000
8
0
0
0
0.26%
0.00%
1.42%
0
0
0
10
8
4
2.000
8
0
0
0
0.06%
0.00%
0.27%
0
0
0
20
8
4
2.000
8
0
0
0
0.01%
0.00%
0.02%
0
0
0
60
8
4
2.000
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
8
4
2.000
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
8
4
2.000
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
8
4
2.000
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
23
24
0.958
23
16
14
19
69.11%
58.93%
80.71%
16
14
19
2
23
24
0.958
23
8
7
10
36.84%
29.76%
45.31%
8
7
10
6
23
24
0.958
23
2
1
3
10.29%
6.30%
14.56%
2
1
3
10
23
24
0.958
23
1
0
1
3.77%
1.70%
6.44%
1
0
1
20
23
24
0.958
23
0
0
0
0.57%
0.13%
1.37%
0
0
0
60
23
24
0.958
23
0
0
0
0.01%
0.00%
0.03%
0
0
0
100
23
24
0.958
23
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
23
24
0.958
23
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
23
24
0.958
23
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 59 of 114
December 2016

-------
C.4-CA withCL-OT
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
4,921,165
21,363,993
0.230
4,921,165
2,124,802
1,253,450
3,175,423
43.18%
25.47%
64.53%
2,124,802
1,253,450
3,175,423
4,921,165
21,363,993
0.230
4,921,165
793,220
509,328
1,258,093
16.12%
10.35%
25.56%
793,220
509,328
1,258,093
4,921,165
21,363,993
0.230
4,921,165
193,481
115,490
299,037
3.93%
2.35%
6.08%
193,481
115,490
299,037
4,921,165
21,363,993
0.230
4,921,165
86,414
45,749
140,529
1.76%
0.93%
2.86%
86,414
45,749
140,529
4,921,165
21,363,993
0.230
4,921,165
24,841
6,433
49,535
0.50%
0.13%
1.01%
24,841
6,433
49,535
4,921,165
21,363,993
0.230
4,921,165
1,460
61
5,704
0.03%
0.00%
0.12%
1,460
61
5,704
4,921,165
21,363,993
0.230
4,921,165
244
4
1,081
0.00%
0.00%
0.02%
244
4
1,081
4,921,165
21,363,993
0.230
4,921,165
13
0
60
0.00%
0.00%
0.00%
13
0
60
4,921,165
21,363,993
0.230
4,921,165
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,827,946
9,764,629
0.392
3,827,946
1,565,378
866,013
2,414,617
40.89%
22.62%
63.08%
1,565,378
866,013
2,414,617
3,827,946
9,764,629
0.392
3,827,946
553,025
348,163
902,873
14.45%
9.10%
23.59%
553,025
348,163
902,873
3,827,946
9,764,629
0.392
3,827,946
143,394
88,811
210,664
3.75%
2.32%
5.50%
143,394
88,811
210,664
3,827,946
9,764,629
0.392
3,827,946
70,221
38,980
108,744
1.83%
1.02%
2.84%
70,221
38,980
108,744
3,827,946
9,764,629
0.392
3,827,946
22,688
5,907
44,630
0.59%
0.15%
1.17%
22,688
5,907
44,630
3,827,946
9,764,629
0.392
3,827,946
1,433
59
5,610
0.04%
0.00%
0.15%
1,433
59
5,610
3,827,946
9,764,629
0.392
3,827,946
242
4
1,072
0.01%
0.00%
0.03%
242
4
1,072
3,827,946
9,764,629
0.392
3,827,946
13
0
60
0.00%
0.00%
0.00%
13
0
60
3,827,946
9,764,629
0.392
3,827,946
0
0
0
0.00%
0.00%
0.00%
0
0
0
255,707
560,393
0.456
255,707
50,287
2,589
115,919
19.67%
1.01%
45.33%
50,287
2,589
115,919
255,707
560,393
0.456
255,707
9,490
23
37,407
3.71%
0.01%
14.63%
9,490
23
37,407
255,707
560,393
0.456
255,707
883
0
4,818
0.35%
0.00%
1.88%
883
0
4,818
255,707
560,393
0.456
255,707
213
0
1,057
0.08%
0.00%
0.41%
213
0
1,057
255,707
560,393
0.456
255,707
22
0
70
0.01%
0.00%
0.03%
22
0
70
255,707
560,393
0.456
255,707
0
0
0
0.00%
0.00%
0.00%
0
0
0
255,707
560,393
0.456
255,707
0
0
0
0.00%
0.00%
0.00%
0
0
0
255,707
560,393
0.456
255,707
0
0
0
0.00%
0.00%
0.00%
0
0
0
255,707
560,393
0.456
255,707
0
0
0
0.00%
0.00%
0.00%
0
0
0
837,512
11,038,971
0.076
837,512
509,137
384,848
644,886
60.79%
45.95%
77.00%
509,137
384,848
644,886
837,512
11,038,971
0.076
837,512
230,706
161,142
317,813
27.55%
19.24%
37.95%
230,706
161,142
317,813
837,512
11,038,971
0.076
837,512
49,204
26,679
83,556
5.88%
3.19%
9.98%
49,204
26,679
83,556
837,512
11,038,971
0.076
837,512
15,979
6,769
30,727
1.91%
0.81%
3.67%
15,979
6,769
30,727
837,512
11,038,971
0.076
837,512
2,131
525
4,836
0.25%
0.06%
0.58%
2,131
525
4,836
837,512
11,038,971
0.076
837,512
26
2
94
0.00%
0.00%
0.01%
26
2
94
837,512
11,038,971
0.076
837,512
2
0
9
0.00%
0.00%
0.00%
2
0
9
837,512
11,038,971
0.076
837,512
0
0
0
0.00%
0.00%
0.00%
0
0
0
837,512
11,038,971
0.076
837,512
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 60 of 114
December 2016

-------
C.4-CA withCL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All MRs Only
0.6
52
45
1.156
52
44
39
48
84.04%
74.89%
93.05%
44
39
48
2
52
45
1.156
52
28
24
32
53.38%
46.05%
61.62%
28
24
32
6
52
45
1.156
52
9
7
12
18.10%
13.81%
22.88%
9
7
12
10
52
45
1.156
52
4
3
6
7.89%
5.21%
11.07%
4
3
6
20
52
45
1.156
52
1
0
2
1.79%
0.70%
3.31%
1
0
2
60
52
45
1.156
52
0
0
0
0.06%
0.00%
0.24%
0
0
0
100
52
45
1.156
52
0
0
0
0.01%
0.00%
0.03%
0
0
0
200
52
45
1.156
52
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
52
45
1.156
52
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
19
17
1.118
19
16
14
18
85.13%
75.22%
94.08%
16
14
18
2
19
17
1.118
19
11
9
12
56.60%
49.21%
64.26%
11
9
12
6
19
17
1.118
19
4
3
5
23.31%
18.08%
28.87%
4
3
5
10
19
17
1.118
19
2
2
3
11.72%
8.00%
16.26%
2
2
3
20
19
17
1.118
19
1
0
1
3.25%
1.31%
5.69%
1
0
1
60
19
17
1.118
19
0
0
0
0.14%
0.01%
0.54%
0
0
0
100
19
17
1.118
19
0
0
0
0.02%
0.00%
0.08%
0
0
0
200
19
17
1.118
19
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
19
17
1.118
19
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Ground Water
Systems
0.6
5
4
1.250
5
2
1
4
48.41%
23.38%
76.93%
2
1
4
2
5
4
1.250
5
1
0
2
15.07%
3.45%
30.58%
1
0
2
6
5
4
1.250
5
0
0
0
1.33%
0.04%
5.06%
0
0
0
10
5
4
1.250
5
0
0
0
0.24%
0.00%
1.07%
0
0
0
20
5
4
1.250
5
0
0
0
0.01%
0.00%
0.06%
0
0
0
60
5
4
1.250
5
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
5
4
1.250
5
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
5
4
1.250
5
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
5
4
1.250
5
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
28
24
1.167
28
25
23
27
89.66%
83.85%
95.23%
25
23
27
2
28
24
1.167
28
16
14
18
58.04%
51.50%
65.37%
16
14
18
6
28
24
1.167
28
5
4
6
17.57%
13.38%
21.99%
5
4
6
10
28
24
1.167
28
2
1
3
6.66%
4.24%
9.34%
2
1
3
20
28
24
1.167
28
0
0
1
1.11%
0.41%
2.27%
0
0
1
60
28
24
1.167
28
0
0
0
0.02%
0.00%
0.07%
0
0
0
100
28
24
1.167
28
0
0
0
0.00%
0.00%
0.01%
0
0
0
200
28
24
1.167
28
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
28
24
1.167
28
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 61 of 114
December 2016

-------
C.4-CA withCL-OT
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation


Exceeding




- National






Threshold
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
3,816,248
21,363,993
0.179
3,816,248
3,144,982
2,493,963
3,599,969
82.41%
65.35%
94.33%
3,144,982
2,493,963
3,599,969
3,816,248
21,363,993
0.179
3,816,248
1,794,317
1,354,694
2,409,110
47.02%
35.50%
63.13%
1,794,317
1,354,694
2,409,110
3,816,248
21,363,993
0.179
3,816,248
598,436
413,740
807,294
15.68%
10.84%
21.15%
598,436
413,740
807,294
3,816,248
21,363,993
0.179
3,816,248
259,949
151,872
412,883
6.81%
3.98%
10.82%
259,949
151,872
412,883
3,816,248
21,363,993
0.179
3,816,248
55,655
21,583
111,707
1.46%
0.57%
2.93%
55,655
21,583
111,707
3,816,248
21,363,993
0.179
3,816,248
1,748
158
6,351
0.05%
0.00%
0.17%
1,748
158
6,351
3,816,248
21,363,993
0.179
3,816,248
214
7
937
0.01%
0.00%
0.02%
214
7
937
3,816,248
21,363,993
0.179
3,816,248
7
0
35
0.00%
0.00%
0.00%
7
0
35
3,816,248
21,363,993
0.179
3,816,248
0
0
0
0.00%
0.00%
0.00%
0
0
0
2,696,184
9,764,629
0.276
2,696,184
2,270,354
1,775,965
2,559,531
84.21%
65.87%
94.93%
2,270,354
1,775,965
2,559,531
2,696,184
9,764,629
0.276
2,696,184
1,320,642
982,465
1,808,230
48.98%
36.44%
67.07%
1,320,642
982,465
1,808,230
2,696,184
9,764,629
0.276
2,696,184
486,832
344,382
647,534
18.06%
12.77%
24.02%
486,832
344,382
647,534
2,696,184
9,764,629
0.276
2,696,184
224,354
133,301
354,792
8.32%
4.94%
13.16%
224,354
133,301
354,792
2,696,184
9,764,629
0.276
2,696,184
51,079
19,902
102,982
1.89%
0.74%
3.82%
51,079
19,902
102,982
2,696,184
9,764,629
0.276
2,696,184
1,690
152
6,153
0.06%
0.01%
0.23%
1,690
152
6,153
2,696,184
9,764,629
0.276
2,696,184
209
7
917
0.01%
0.00%
0.03%
209
7
917
2,696,184
9,764,629
0.276
2,696,184
7
0
34
0.00%
0.00%
0.00%
7
0
34
2,696,184
9,764,629
0.276
2,696,184
0
0
0
0.00%
0.00%
0.00%
0
0
0
196,321
560,393
0.350
196,321
92,248
32,305
163,833
46.99%
16.46%
83.45%
92,248
32,305
163,833
196,321
560,393
0.350
196,321
26,477
4,375
64,297
13.49%
2.23%
32.75%
26,477
4,375
64,297
196,321
560,393
0.350
196,321
2,205
44
8,282
1.12%
0.02%
4.22%
2,205
44
8,282
196,321
560,393
0.350
196,321
395
2
1,583
0.20%
0.00%
0.81%
395
2
1,583
196,321
560,393
0.350
196,321
22
0
90
0.01%
0.00%
0.05%
22
0
90
196,321
560,393
0.350
196,321
0
0
0
0.00%
0.00%
0.00%
0
0
0
196,321
560,393
0.350
196,321
0
0
0
0.00%
0.00%
0.00%
0
0
0
196,321
560,393
0.350
196,321
0
0
0
0.00%
0.00%
0.00%
0
0
0
196,321
560,393
0.350
196,321
0
0
0
0.00%
0.00%
0.00%
0
0
0
923,743
11,038,971
0.084
923,743
782,379
685,693
876,605
84.70%
74.23%
94.90%
782,379
685,693
876,605
923,743
11,038,971
0.084
923,743
447,198
367,854
536,583
48.41%
39.82%
58.09%
447,198
367,854
536,583
923,743
11,038,971
0.084
923,743
109,398
69,314
151,479
11.84%
7.50%
16.40%
109,398
69,314
151,479
923,743
11,038,971
0.084
923,743
35,200
18,568
56,507
3.81%
2.01%
6.12%
35,200
18,568
56,507
923,743
11,038,971
0.084
923,743
4,555
1,681
8,635
0.49%
0.18%
0.93%
4,555
1,681
8,635
923,743
11,038,971
0.084
923,743
57
6
198
0.01%
0.00%
0.02%
57
6
198
923,743
11,038,971
0.084
923,743
5
0
19
0.00%
0.00%
0.00%
5
0
19
923,743
11,038,971
0.084
923,743
0
0
0
0.00%
0.00%
0.00%
0
0
0
923,743
11,038,971
0.084
923,743
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 62 of 114
December 2016

-------
C.4-CA withCL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation



Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
95
1,445
1.274
1,841
54
42
69
57.17%
44.37%
72.38%
925
641
1,285

2
95
1,445
1.274
1,841
32
26
40
33.87%
27.56%
42.40%
604
491
791

6
95
1,445
1.274
1,841
15
12
19
16.03%
12.47%
20.17%
373
306
456

10
95
1,445
1.274
1,841
10
7
13
10.31%
7.63%
13.39%
273
209
342
All EPs Only
20
95
1,445
1.274
1,841
5
3
7
5.05%
3.21%
7.17%
140
83
201

60
95
1,445
1.274
1,841
1
0
2
0.99%
0.37%
1.89%
19
5
43

100
95
1,445
1.274
1,841
0
0
1
0.34%
0.07%
0.81%
5
1
14

200
95
1,445
1.274
1,841
0
0
0
0.05%
0.00%
0.17%
1
0
2

600
95
1,445
1.274
1,841
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
41
154
1.052
162
25
20
31
61.98%
49.91%
75.16%
132
116
150

2
41
154
1.052
162
16
14
19
39.40%
33.33%
47.00%
102
90
116

6
41
154
1.052
162
9
7
10
20.88%
17.35%
25.07%
61
53
71
EPs Only at Surface
Water Systems
10
41
154
1.052
162
6
5
7
14.40%
11.47%
17.59%
44
37
52
20
41
154
1.052
162
3
2
4
7.84%
5.43%
10.48%
26
19
32
60
41
154
1.052
162
1
0
1
1.92%
0.78%
3.41%
7
3
12

100
41
154
1.052
162
0
0
1
0.71%
0.15%
1.62%
3
1
6

200
41
154
1.052
162
0
0
0
0.11%
0.01%
0.36%
0
0
1

600
41
154
1.052
162
0
0
0
0.00%
0.00%
0.01%
0
0
0

0.6
14
493
1.659
819
2
0
6
17.72%
0.76%
44.55%
154
3
381

2
14
493
1.659
819
0
0
2
3.19%
0.01%
13.47%
28
0
116

6
14
493
1.659
819
0
0
0
0.26%
0.00%
1.42%
2
0
12
EPs Only at Ground
Water Systems
10
14
493
1.659
819
0
0
0
0.06%
0.00%
0.27%
0
0
2
20
14
493
1.659
819
0
0
0
0.00%
0.00%
0.02%
0
0
0
60
14
493
1.659
819
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
14
493
1.659
819
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
14
493
1.659
819
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
14
493
1.659
819
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
40
797
1.079
861
26
22
32
66.06%
53.96%
79.28%
639
522
755

2
40
797
1.079
861
16
13
19
38.93%
31.28%
47.81%
474
400
558

6
40
797
1.079
861
7
5
9
16.57%
11.83%
21.72%
310
253
373
EPs Only at
10
40
797
1.079
861
4
3
5
9.70%
6.37%
13.68%
229
171
287
Mixed Water
20
40
797
1.079
861
2
1
3
3.95%
2.06%
6.29%
114
64
169
Systems
60
40
797
1.079
861
0
0
0
0.38%
0.07%
1.00%
12
2
32

100
40
797
1.079
861
0
0
0
0.08%
0.01%
0.26%
2
0
8

200
40
797
1.079
861
0
0
0
0.01%
0.00%
0.02%
0
0
1

600
40
797
1.079
861
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 63 of 114
December 2016

-------
C.4-CA withCL-OT
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
5,072,058
28,628,587
0.240
6,876,123
2,206,488
1,304,982
3,300,516
43.50%
25.73%
65.07%
3,177,024
1,936,795
4,658,176
5,072,058
28,628,587
0.240
6,876,123
841,688
546,008
1,331,656
16.59%
10.77%
26.25%
1,423,039
987,357
2,158,273
5,072,058
28,628,587
0.240
6,876,123
217,085
131,218
331,462
4.28%
2.59%
6.54%
515,227
322,458
740,686
5,072,058
28,628,587
0.240
6,876,123
100,450
54,490
161,907
1.98%
1.07%
3.19%
281,391
153,518
446,513
5,072,058
28,628,587
0.240
6,876,123
30,766
10,123
58,896
0.61%
0.20%
1.16%
100,945
44,552
185,852
5,072,058
28,628,587
0.240
6,876,123
2,545
490
7,705
0.05%
0.01%
0.15%
10,173
2,894
24,258
5,072,058
28,628,587
0.240
6,876,123
615
89
1,922
0.01%
0.00%
0.04%
2,670
501
7,019
5,072,058
28,628,587
0.240
6,876,123
68
5
231
0.00%
0.00%
0.00%
316
25
1,038
5,072,058
28,628,587
0.240
6,876,123
1
0
3
0.00%
0.00%
0.00%
4
0
16
3,880,657
10,490,027
0.392
4,106,851
1,603,390
892,739
2,465,467
41.32%
23.00%
63.53%
1,760,265
996,521
2,682,916
3,880,657
10,490,027
0.392
4,106,851
578,877
369,232
939,461
14.92%
9.51%
24.21%
681,440
450,878
1,091,979
3,880,657
10,490,027
0.392
4,106,851
157,132
99,570
228,182
4.05%
2.57%
5.88%
210,546
141,262
297,090
3,880,657
10,490,027
0.392
4,106,851
79,034
45,675
120,301
2.04%
1.18%
3.10%
113,215
71,617
165,271
3,880,657
10,490,027
0.392
4,106,851
27,023
9,038
50,478
0.70%
0.23%
1.30%
43,821
21,170
73,147
3,880,657
10,490,027
0.392
4,106,851
2,421
468
7,354
0.06%
0.01%
0.19%
6,248
2,054
14,112
3,880,657
10,490,027
0.392
4,106,851
595
87
1,862
0.02%
0.00%
0.05%
1,965
411
4,925
3,880,657
10,490,027
0.392
4,106,851
67
5
227
0.00%
0.00%
0.01%
273
23
874
3,880,657
10,490,027
0.392
4,106,851
1
0
3
0.00%
0.00%
0.00%
4
0
15
286,934
1,170,551
0.516
604,057
57,112
2,605
142,125
19.90%
0.91%
49.53%
122,729
3,333
334,554
286,934
1,170,551
0.516
604,057
10,835
23
45,190
3.78%
0.01%
15.75%
23,349
27
104,777
286,934
1,170,551
0.516
604,057
991
0
5,207
0.35%
0.00%
1.81%
1,960
0
8,903
286,934
1,170,551
0.516
604,057
236
0
1,108
0.08%
0.00%
0.39%
431
0
1,652
286,934
1,170,551
0.516
604,057
23
0
72
0.01%
0.00%
0.02%
37
0
96
286,934
1,170,551
0.516
604,057
0
0
0
0.00%
0.00%
0.00%
0
0
0
286,934
1,170,551
0.516
604,057
0
0
0
0.00%
0.00%
0.00%
0
0
0
286,934
1,170,551
0.516
604,057
0
0
0
0.00%
0.00%
0.00%
0
0
0
286,934
1,170,551
0.516
604,057
0
0
0
0.00%
0.00%
0.00%
0
0
0
904,467
16,968,009
0.128
2,165,216
545,986
409,639
692,924
60.37%
45.29%
76.61%
1,294,030
936,941
1,640,705
904,467
16,968,009
0.128
2,165,216
251,975
176,752
347,004
27.86%
19.54%
38.37%
718,250
536,453
961,517
904,467
16,968,009
0.128
2,165,216
58,963
31,648
98,074
6.52%
3.50%
10.84%
302,721
181,196
434,693
904,467
16,968,009
0.128
2,165,216
21,181
8,816
40,497
2.34%
0.97%
4.48%
167,746
81,901
279,590
904,467
16,968,009
0.128
2,165,216
3,720
1,085
8,347
0.41%
0.12%
0.92%
57,087
23,382
112,609
904,467
16,968,009
0.128
2,165,216
124
22
351
0.01%
0.00%
0.04%
3,925
840
10,145
904,467
16,968,009
0.128
2,165,216
19
2
60
0.00%
0.00%
0.01%
706
90
2,094
904,467
16,968,009
0.128
2,165,216
1
0
4
0.00%
0.00%
0.00%
43
2
164
904,467
16,968,009
0.128
2,165,216
0
0
0
0.00%
0.00%
0.00%
0
0
1
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 64 of 114
December 2016

-------
C.4-CA withCL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All MRs Only
0.6
89
1,445
1.049
1,516
76
65
84
84.96%
73.59%
94.93%
1,134
840
1,399
2
89
1,445
1.049
1,516
51
43
60
56.89%
48.33%
67.03%
740
592
950
6
89
1,445
1.049
1,516
22
18
27
25.14%
19.95%
30.85%
410
319
508
10
89
1,445
1.049
1,516
13
10
17
14.67%
10.88%
18.88%
271
194
353
20
89
1,445
1.049
1,516
6
4
8
6.42%
4.46%
9.09%
113
62
181
60
89
1,445
1.049
1,516
1
1
2
1.48%
0.72%
2.44%
15
6
29
100
89
1,445
1.049
1,516
0
0
1
0.54%
0.15%
1.08%
5
1
10
200
89
1,445
1.049
1,516
0
0
0
0.08%
0.01%
0.23%
1
0
2
600
89
1,445
1.049
1,516
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
35
154
1.013
156
31
28
34
89.34%
79.07%
96.72%
146
131
155
2
35
154
1.013
156
23
20
26
65.92%
57.63%
74.78%
119
106
133
6
35
154
1.013
156
12
11
15
35.64%
30.01%
41.82%
76
67
86
10
35
154
1.013
156
8
7
10
23.51%
18.86%
28.58%
56
47
65
20
35
154
1.013
156
4
3
6
12.52%
9.80%
15.97%
34
29
41
60
35
154
1.013
156
1
1
2
3.61%
1.81%
5.70%
11
6
17
100
35
154
1.013
156
0
0
1
1.34%
0.39%
2.67%
4
1
8
200
35
154
1.013
156
0
0
0
0.19%
0.02%
0.59%
1
0
2
600
35
154
1.013
156
0
0
0
0.00%
0.00%
0.01%
0
0
0
MRs Only at
Ground Water
Systems
0.6
9
493
1.002
494
4
1
7
46.17%
15.55%
79.81%
214
38
389
2
9
493
1.002
494
1
0
3
12.81%
1.95%
32.59%
50
1
154
6
9
493
1.002
494
0
0
0
1.09%
0.02%
4.40%
4
0
18
10
9
493
1.002
494
0
0
0
0.21%
0.00%
0.88%
1
0
3
20
9
493
1.002
494
0
0
0
0.01%
0.00%
0.05%
0
0
0
60
9
493
1.002
494
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
9
493
1.002
494
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
9
493
1.002
494
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
9
493
1.002
494
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
45
797
1.086
866
40
36
43
89.31%
80.94%
96.57%
774
671
855
2
45
797
1.086
866
26
23
31
58.68%
50.37%
67.89%
572
486
663
6
45
797
1.086
866
10
7
12
21.78%
16.11%
27.60%
330
253
403
10
45
797
1.086
866
5
3
7
10.68%
6.86%
14.94%
214
147
285
20
45
797
1.086
866
1
1
2
2.96%
1.19%
5.55%
79
34
139
60
45
797
1.086
866
0
0
0
0.12%
0.01%
0.38%
4
0
12
100
45
797
1.086
866
0
0
0
0.02%
0.00%
0.06%
1
0
2
200
45
797
1.086
866
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
45
797
1.086
866
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 65 of 114
December 2016

-------
C.4-CA withCL-OT
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
3,960,096
28,628,587
0.195
5,595,088
3,259,083
2,573,402
3,742,216
82.30%
64.98%
94.50%
4,602,023
3,589,084
5,344,478
3,960,096
28,628,587
0.195
5,595,088
1,863,885
1,406,227
2,510,478
47.07%
35.51%
63.39%
2,697,058
2,037,646
3,652,865
3,960,096
28,628,587
0.195
5,595,088
629,147
434,522
848,429
15.89%
10.97%
21.42%
966,457
631,218
1,325,649
3,960,096
28,628,587
0.195
5,595,088
278,238
163,479
439,587
7.03%
4.13%
11.10%
456,408
256,060
732,408
3,960,096
28,628,587
0.195
5,595,088
63,780
27,059
124,283
1.61%
0.68%
3.14%
122,962
57,295
236,178
3,960,096
28,628,587
0.195
5,595,088
3,662
1,111
9,487
0.09%
0.03%
0.24%
12,108
4,921
24,701
3,960,096
28,628,587
0.195
5,595,088
888
207
2,277
0.02%
0.01%
0.06%
3,628
987
7,937
3,960,096
28,628,587
0.195
5,595,088
98
12
297
0.00%
0.00%
0.01%
455
59
1,334
3,960,096
28,628,587
0.195
5,595,088
1
0
4
0.00%
0.00%
0.00%
5
0
19
2,748,895
10,490,027
0.284
2,975,089
2,316,643
1,808,263
2,612,179
84.28%
65.78%
95.03%
2,513,300
1,940,015
2,838,111
2,748,895
10,490,027
0.284
2,975,089
1,352,231
1,006,639
1,851,808
49.19%
36.62%
67.37%
1,481,658
1,101,956
2,037,020
2,748,895
10,490,027
0.284
2,975,089
504,878
359,312
669,187
18.37%
13.07%
24.34%
575,563
417,187
755,514
2,748,895
10,490,027
0.284
2,975,089
237,094
143,085
370,717
8.63%
5.21%
13.49%
286,609
181,000
432,963
2,748,895
10,490,027
0.284
2,975,089
58,045
25,107
112,431
2.11%
0.91%
4.09%
85,050
45,279
149,084
2,748,895
10,490,027
0.284
2,975,089
3,572
1,102
9,185
0.13%
0.04%
0.33%
10,863
4,782
20,933
2,748,895
10,490,027
0.284
2,975,089
879
206
2,244
0.03%
0.01%
0.08%
3,475
979
7,386
2,748,895
10,490,027
0.284
2,975,089
98
12
296
0.00%
0.00%
0.01%
450
59
1,312
2,748,895
10,490,027
0.284
2,975,089
1
0
4
0.00%
0.00%
0.00%
5
0
19
225,683
1,170,551
0.391
458,130
105,091
32,467
192,352
46.57%
14.39%
85.23%
207,181
39,226
405,262
225,683
1,170,551
0.391
458,130
29,385
4,377
78,173
13.02%
1.94%
34.64%
53,105
4,468
181,546
225,683
1,170,551
0.391
458,130
2,447
44
9,237
1.08%
0.02%
4.09%
4,361
44
18,397
225,683
1,170,551
0.391
458,130
448
2
1,711
0.20%
0.00%
0.76%
836
2
3,120
225,683
1,170,551
0.391
458,130
26
0
95
0.01%
0.00%
0.04%
54
0
159
225,683
1,170,551
0.391
458,130
0
0
0
0.00%
0.00%
0.00%
0
0
0
225,683
1,170,551
0.391
458,130
0
0
0
0.00%
0.00%
0.00%
0
0
0
225,683
1,170,551
0.391
458,130
0
0
0
0.00%
0.00%
0.00%
0
0
0
225,683
1,170,551
0.391
458,130
0
0
0
0.00%
0.00%
0.00%
0
0
0
985,518
16,968,009
0.127
2,161,870
837,349
732,672
937,685
84.97%
74.34%
95.15%
1,881,541
1,609,843
2,101,105
985,518
16,968,009
0.127
2,161,870
482,269
395,210
580,498
48.94%
40.10%
58.90%
1,162,295
931,221
1,434,300
985,518
16,968,009
0.127
2,161,870
121,822
75,166
170,005
12.36%
7.63%
17.25%
386,533
213,987
551,739
985,518
16,968,009
0.127
2,161,870
40,696
20,391
67,159
4.13%
2.07%
6.81%
168,963
75,057
296,325
985,518
16,968,009
0.127
2,161,870
5,709
1,952
11,757
0.58%
0.20%
1.19%
37,859
12,016
86,935
985,518
16,968,009
0.127
2,161,870
90
9
302
0.01%
0.00%
0.03%
1,245
139
3,768
985,518
16,968,009
0.127
2,161,870
8
0
33
0.00%
0.00%
0.00%
153
8
551
985,518
16,968,009
0.127
2,161,870
0
0
1
0.00%
0.00%
0.00%
5
0
22
985,518
16,968,009
0.127
2,161,870
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 66 of 114
December 2016

-------
C.5 - CL with OT
Source Water Type
Threshold (ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted to
have Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All EPs Only
0.6
1
9
1.000
9
0
0
1
10.28%
0.00%
66.57%
1
0
6
2
1
9
1.000
9
0
0
0
1.31%
0.00%
4.84%
0
0
0
6
1
9
1.000
9
0
0
0
0.06%
0.00%
0.05%
0
0
0
10
1
9
1.000
9
0
0
0
0.01%
0.00%
0.00%
0
0
0
20
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
1
9
1.000
9
0
0
1
10.28%
0.00%
66.57%
1
0
6
2
1
9
1.000
9
0
0
0
1.31%
0.00%
4.84%
0
0
0
6
1
9
1.000
9
0
0
0
0.06%
0.00%
0.05%
0
0
0
10
1
9
1.000
9
0
0
0
0.01%
0.00%
0.00%
0
0
0
20
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 67 of 114
December 2016

-------
C.5 - CL with OT
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
4,501
22,661
0.500
11,331
463
0
2,996
10.28%
0.00%
66.57%
1,165
0
7,543
4,501
22,661
0.500
11,331
59
0
218
1.31%
0.00%
4.84%
149
0
548
4,501
22,661
0.500
11,331
2
0
2
0.06%
0.00%
0.05%
6
0
6
4,501
22,661
0.500
11,331
0
0
0
0.01%
0.00%
0.00%
1
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
463
0
2,996
10.28%
0.00%
66.57%
1,165
0
7,543
4,501
22,661
0.500
11,331
59
0
218
1.31%
0.00%
4.84%
149
0
548
4,501
22,661
0.500
11,331
2
0
2
0.06%
0.00%
0.05%
6
0
6
4,501
22,661
0.500
11,331
0
0
0
0.01%
0.00%
0.00%
1
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 68 of 114
December 2016

-------
C.5 - CL with OT
Source Water Type
Threshold
Total
Number of
National
Number
MR Ratio
National
Number of
Number of
UCMR 2 MRs
Predicted to
have Any
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
(ng/L)


Exceeding
Threshold 
National
Extrapolation





UCMR 2 MRs
Systems

MRs
Detects
Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound






SMALL SYSTEMS (Serving
< 10,000)







0.6
1
9
1.000
9
0
0
1
38.50%
0.01%
99.51%
3
0
9

2
1
9
1.000
9
0
0
0
7.40%
0.00%
46.62%
1
0
4

6
1
9
1.000
9
0
0
0
0.33%
0.00%
1.99%
0
0
0

10
1
9
1.000
9
0
0
0
0.04%
0.00%
0.19%
0
0
0
All MRs Only
20
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

60
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
9
1.000
9
0
0
1
38.50%
0.01%
99.51%
3
0
9

2
1
9
1.000
9
0
0
0
7.40%
0.00%
46.62%
1
0
4

6
1
9
1.000
9
0
0
0
0.33%
0.00%
1.99%
0
0
0
MRs Only at
10
1
9
1.000
9
0
0
0
0.04%
0.00%
0.19%
0
0
0
Surface Water
20
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 69 of 114
December 2016

-------
C.5 - CL with OT
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
4,501
22,661
0.500
11,331
1,733
1
4,479
38.50%
0.01%
99.51%
4,362
2
11,276
4,501
22,661
0.500
11,331
333
0
2,098
7.40%
0.00%
46.62%
838
0
5,282
4,501
22,661
0.500
11,331
15
0
90
0.33%
0.00%
1.99%
38
0
226
4,501
22,661
0.500
11,331
2
0
9
0.04%
0.00%
0.19%
5
0
22
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
1,733
1
4,479
38.50%
0.01%
99.51%
4,362
2
11,276
4,501
22,661
0.500
11,331
333
0
2,098
7.40%
0.00%
46.62%
838
0
5,282
4,501
22,661
0.500
11,331
15
0
90
0.33%
0.00%
1.99%
38
0
226
4,501
22,661
0.500
11,331
2
0
9
0.04%
0.00%
0.19%
5
0
22
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 70 of 114
December 2016

-------
C.5 - CL with OT
Source Water Type
Threshold (ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted to
have Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
All EPs Only
0.6
12
88
1.663
147
1
0
3
6.59%
0.00%
28.51%
10
0
42
2
12
88
1.663
147
0
0
1
0.88%
0.00%
4.86%
1
0
7
6
12
88
1.663
147
0
0
0
0.05%
0.00%
0.18%
0
0
0
10
12
88
1.663
147
0
0
0
0.01%
0.00%
0.02%
0
0
0
20
12
88
1.663
147
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
12
88
1.663
147
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
12
88
1.663
147
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
12
88
1.663
147
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
12
88
1.663
147
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
1
6
1.000
6
0
0
1
6.86%
0.00%
55.16%
0
0
3
2
1
6
1.000
6
0
0
0
0.82%
0.00%
2.80%
0
0
0
6
1
6
1.000
6
0
0
0
0.04%
0.00%
0.03%
0
0
0
10
1
6
1.000
6
0
0
0
0.01%
0.00%
0.00%
0
0
0
20
1
6
1.000
6
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
1
6
1.000
6
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
6
1.000
6
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
6
1.000
6
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
6
1.000
6
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
7
40
1.400
55
0
0
2
6.56%
0.00%
23.39%
4
0
13
2
7
40
1.400
55
0
0
0
1.02%
0.00%
6.06%
1
0
3
6
7
40
1.400
55
0
0
0
0.07%
0.00%
0.35%
0
0
0
10
7
40
1.400
55
0
0
0
0.01%
0.00%
0.05%
0
0
0
20
7
40
1.400
55
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
7
40
1.400
55
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
7
40
1.400
55
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
7
40
1.400
55
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
7
40
1.400
55
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
4
43
2.000
86
0
0
1
6.59%
0.00%
29.92%
6
0
26
2
4
43
2.000
86
0
0
0
0.80%
0.00%
4.23%
1
0
4
6
4
43
2.000
86
0
0
0
0.03%
0.00%
0.09%
0
0
0
10
4
43
2.000
86
0
0
0
0.00%
0.00%
0.01%
0
0
0
20
4
43
2.000
86
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
4
43
2.000
86
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
4
43
2.000
86
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
4
43
2.000
86
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
4
43
2.000
86
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 71 of 114
December 2016

-------
C.5 - CL with OT
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
96,533
2,658,633
0.364
966,552
5,899
0
29,883
6.21%
0.00%
28.54%
59,988

275,807
96,533
2,658,633
0.364
966,552
757
0
3,621
0.78%
0.00%
3.98%
7,538
0
38,449
96,533
2,658,633
0.364
966,552
38
0
100
0.04%
0.00%
0.10%
355
0
962
96,533
2,658,633
0.364
966,552
6
0
12
0.01%
0.00%
0.01%
54
0
105
96,533
2,658,633
0.364
966,552
0
0
0
0.00%
0.00%
0.00%
3
0
3
96,533
2,658,633
0.364
966,552
0
0
0
0.00%
0.00%
0.00%
0
0
0
96,533
2,658,633
0.364
966,552
0
0
0
0.00%
0.00%
0.00%
0
0
0
96,533
2,658,633
0.364
966,552
0
0
0
0.00%
0.00%
0.00%
0
0
0
96,533
2,658,633
0.364
966,552
0
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
204,070
0.250
51,017
1,325
0
10,657
6.86%
0.00%
55.16%
3,498
0
28,142
19,320
204,070
0.250
51,017
157
0
542
0.82%
0.00%
2.80%
416
0
1,430
19,320
204,070
0.250
51,017
7
0
5
0.04%
0.00%
0.03%
19
0
13
19,320
204,070
0.250
51,017
1
0
0
0.01%
0.00%
0.00%
3
0
1
19,320
204,070
0.250
51,017
0
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
204,070
0.250
51,017
0
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
204,070
0.250
51,017
0
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
204,070
0.250
51,017
0
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
204,070
0.250
51,017
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,409
1,022,776
0.163
167,097
1,219
0
3,824
4.80%
0.00%
15.05%
8,017

25,149
25,409
1,022,776
0.163
167,097
195
0
949
0.77%
0.00%
3.74%
1,281
0
6,241
25,409
1,022,776
0.163
167,097
14
0
54
0.05%
0.00%
0.21%
89
0
356
25,409
1,022,776
0.163
167,097
3
0
8
0.01%
0.00%
0.03%
18
0
53
25,409
1,022,776
0.163
167,097
0
0
0
0.00%
0.00%
0.00%
1
0
2
25,409
1,022,776
0.163
167,097
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,409
1,022,776
0.163
167,097
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,409
1,022,776
0.163
167,097
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,409
1,022,776
0.163
167,097
0
0
0
0.00%
0.00%
0.00%
0
0
0
51,804
1,431,788
0.523
748,437
3,355
0
15,402
6.48%
0.00%
29.73%
48,473
0
222,516
51,804
1,431,788
0.523
748,437
404
0
2,130
0.78%
0.00%
4.11%
5,841
0
30,777
51,804
1,431,788
0.523
748,437
17
0
41
0.03%
0.00%
0.08%
248
0
593
51,804
1,431,788
0.523
748,437
2
0
4
0.00%
0.00%
0.01%
34
0
51
51,804
1,431,788
0.523
748,437
0
0
0
0.00%
0.00%
0.00%
1
0
1
51,804
1,431,788
0.523
748,437
0
0
0
0.00%
0.00%
0.00%
0
0
0
51,804
1,431,788
0.523
748,437
0
0
0
0.00%
0.00%
0.00%
0
0
0
51,804
1,431,788
0.523
748,437
0
0
0
0.00%
0.00%
0.00%
0
0
0
51,804
1,431,788
0.523
748,437
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 72 of 114
December 2016

-------
C.5 - CL with OT
Source Water Type
Threshold
Total
Number of
National
Number
MR Ratio
National
Number of
Number of
UCMR 2 MRs
Predicted to
have Any
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
(ng/L)


Exceeding
Threshold 
National
Extrapolation





UCMR 2 MRs
Systems

MRs
Detects
Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)

0.6
11
88
1.268
112
2
0
5
19.63%
0.19%
55.21%
22
0
62

2
11
88
1.268
112
0
0
1
3.15%
0.00%
15.88%
4
0
18

6
11
88
1.268
112
0
0
0
0.17%
0.00%
0.85%
0
0
1

10
11
88
1.268
112
0
0
0
0.03%
0.00%
0.10%
0
0
0
All MRs Only
20
11
88
1.268
112
0
0
0
0.00%
0.00%
0.00%
0
0
0

60
11
88
1.268
112
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
11
88
1.268
112
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
11
88
1.268
112
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
11
88
1.268
112
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
6
1.000
6
0
0
1
29.96%
0.00%
96.53%
2
0
6

2
1
6
1.000
6
0
0
0
4.08%
0.00%
22.41%
0
0
1

6
1
6
1.000
6
0
0
0
0.12%
0.00%
0.46%
0
0
0
MRs Only at
10
1
6
1.000
6
0
0
0
0.01%
0.00%
0.03%
0
0
0
Surface Water
20
1
6
1.000
6
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
1
6
1.000
6
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
6
1.000
6
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
6
1.000
6
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
6
1.000
6
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
8
40
1.600
63
1
0
2
8.58%
0.04%
28.80%
5
0
18

2
8
40
1.600
63
0
0
0
0.84%
0.00%
4.07%
1
0
3

6
8
40
1.600
63
0
0
0
0.03%
0.00%
0.12%
0
0
0
MRs Only at
10
8
40
1.600
63
0
0
0
0.00%
0.00%
0.01%
0
0
0
Ground Water
20
8
40
1.600
63
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
8
40
1.600
63
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
8
40
1.600
63
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
8
40
1.600
63
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
8
40
1.600
63
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
2
43
1.000
43
1
0
2
34.48%
0.42%
88.32%
15
0
38

2
2
43
1.000
43
0
0
1
6.43%
0.00%
32.38%
3
0
14

6
2
43
1.000
43
0
0
0
0.37%
0.00%
1.98%
0
0
1
MRs Only at
10
2
43
1.000
43
0
0
0
0.06%
0.00%
0.25%
0
0
0
Mixed Water
20
2
43
1.000
43
0
0
0
0.00%
0.00%
0.01%
0
0
0
Systems
60
2
43
1.000
43
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
2
43
1.000
43
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
2
43
1.000
43
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
2
43
1.000
43
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 73 of 114
December 2016

-------
C.5 - CL with OT
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
71,557
2,658,633
0.222
589,553
17,499
111
56,110
27.20%
0.26%
79.45%
160,330
1,543
468,380
71,557
2,658,633
0.222
589,553
2,797
0
14,875
4.77%
0.00%
24.59%
28,093
2
144,963
71,557
2,658,633
0.222
589,553
131
0
660
0.26%
0.00%
1.35%
1,529
0
7,954
71,557
2,658,633
0.222
589,553
19
0
73
0.04%
0.00%
0.16%
234
0
931
71,557
2,658,633
0.222
589,553
1
0
2
0.00%
0.00%
0.00%
10
0
22
71,557
2,658,633
0.222
589,553
0
0
0
0.00%
0.00%
0.00%
0
0
0
71,557
2,658,633
0.222
589,553
0
0
0
0.00%
0.00%
0.00%
0
0
0
71,557
2,658,633
0.222
589,553
0
0
0
0.00%
0.00%
0.00%
0
0
0
71,557
2,658,633
0.222
589,553
0
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
204,070
0.250
51,017
5,788
0
18,650
29.96%
0.00%
96.53%
15,284
0
49,248
19,320
204,070
0.250
51,017
788
0
4,329
4.08%
0.00%
22.41%
2,081
0
11,431
19,320
204,070
0.250
51,017
23
0
88
0.12%
0.00%
0.46%
60
0
234
19,320
204,070
0.250
51,017
2
0
6
0.01%
0.00%
0.03%
6
0
16
19,320
204,070
0.250
51,017
0
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
204,070
0.250
51,017
0
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
204,070
0.250
51,017
0
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
204,070
0.250
51,017
0
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
204,070
0.250
51,017
0
0
0
0.00%
0.00%
0.00%
0
0
0
27,461
1,022,776
0.177
180,589
3,067
8
15,509
11.17%
0.03%
56.47%
20,172
53
101,987
27,461
1,022,776
0.177
180,589
383
0
2,394
1.40%
0.00%
8.72%
2,521
0
15,741
27,461
1,022,776
0.177
180,589
13
0
68
0.05%
0.00%
0.25%
85
0
446
27,461
1,022,776
0.177
180,589
1
0
6
0.01%
0.00%
0.02%
10
0
37
27,461
1,022,776
0.177
180,589
0
0
0
0.00%
0.00%
0.00%
0
0
1
27,461
1,022,776
0.177
180,589
0
0
0
0.00%
0.00%
0.00%
0
0
0
27,461
1,022,776
0.177
180,589
0
0
0
0.00%
0.00%
0.00%
0
0
0
27,461
1,022,776
0.177
180,589
0
0
0
0.00%
0.00%
0.00%
0
0
0
27,461
1,022,776
0.177
180,589
0
0
0
0.00%
0.00%
0.00%
0
0
0
24,776
1,431,788
0.250
357,947
8,643
103
21,951
34.89%
0.42%
88.60%
124,875
1,490
317,146
24,776
1,431,788
0.250
357,947
1,626
0
8,153
6.56%
0.00%
32.91%
23,491
2
117,791
24,776
1,431,788
0.250
357,947
96
0
503
0.39%
0.00%
2.03%
1,384
0
7,274
24,776
1,431,788
0.250
357,947
15
0
61
0.06%
0.00%
0.25%
218
0
878
24,776
1,431,788
0.250
357,947
1
0
1
0.00%
0.00%
0.01%
10
0
22
24,776
1,431,788
0.250
357,947
0
0
0
0.00%
0.00%
0.00%
0
0
0
24,776
1,431,788
0.250
357,947
0
0
0
0.00%
0.00%
0.00%
0
0
0
24,776
1,431,788
0.250
357,947
0
0
0
0.00%
0.00%
0.00%
0
0
0
24,776
1,431,788
0.250
357,947
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 74 of 114
December 2016

-------
C.5 - CL with OT
Source Water Type
Threshold (ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted to
have Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All EPs Only
0.6
25
13
1.923
25
3
1
6
11.16%
4.84%
22.63%
3
1
6
2
25
13
1.923
25
1
1
2
4.70%
2.20%
8.59%
1
1
2
6
25
13
1.923
25
0
0
1
1.02%
0.12%
2.61%
0
0
1
10
25
13
1.923
25
0
0
0
0.31%
0.02%
1.03%
0
0
0
20
25
13
1.923
25
0
0
0
0.03%
0.00%
0.13%
0
0
0
60
25
13
1.923
25
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
25
13
1.923
25
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
25
13
1.923
25
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
25

1.923
25
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
5
6
0.833
5
0
0
1
5.26%
0.00%
24.21%
0
0
1
2
5
6
0.833
5
0
0
0
0.60%
0.00%
3.75%
0
0
0
6
5
6
0.833
5
0
0
0
0.02%
0.00%
0.07%
0
0
0
10
5
6
0.833
5
0
0
0
0.00%
0.00%
0.01%
0
0
0
20
5
6
0.833
5
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
5
6
0.833
5
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
5
6
0.833
5
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
5
6
0.833
5
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
5
6
0.833
5
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
12
4
3.000
12
0
0
1
1.45%
0.00%
8.61%
0
0
1
2
12
4
3.000
12
0
0
0
0.15%
0.00%
0.78%
0
0
0
6
12
4
3.000
12
0
0
0
0.01%
0.00%
0.01%
0
0
0
10
12
4
3.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
12
4
3.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
12
4
3.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
12
4
3.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
12
4
3.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
12
4
3.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
8
3
2.667
8
2
1
3
29.40%
15.13%
42.67%
2
1
3
2
8
3
2.667
8
1
1
2
14.09%
6.89%
23.33%
1
1
2
6
8
3
2.667
8
0
0
1
3.18%
0.38%
8.08%
0
0
1
10
8
3
2.667
8
0
0
0
0.95%
0.05%
3.20%
0
0
0
20
8
3
2.667
8
0
0
0
0.10%
0.00%
0.42%
0
0
0
60
8
3
2.667
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
8
3
2.667
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
8
3
2.667
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
8
3
2.667
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 75 of 114
December 2016

-------
C.5 - CL with OT
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
1,788,141
9,134,128
0.196
1,788,141
103,934
21,156
368,089
5.81%
1.18%
20.59%
103,934
21,156
368,089
1,788,141
9,134,128
0.196
1,788,141
26,703
9,584
60,430
1.49%
0.54%
3.38%
26,703
9,584
60,430
1,788,141
9,134,128
0.196
1,788,141
4,664
523
11,594
0.26%
0.03%
0.65%
4,664
523
11,594
1,788,141
9,134,128
0.196
1,788,141
1,354
68
4,486
0.08%
0.00%
0.25%
1,354
68
4,486
1,788,141
9,134,128
0.196
1,788,141
145
2
582
0.01%
0.00%
0.03%
145
2
582
1,788,141
9,134,128
0.196
1,788,141
1
0
5
0.00%
0.00%
0.00%
1
0
5
1,788,141
9,134,128
0.196
1,788,141
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,788,141
9,134,128
0.196
1,788,141
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,788,141
9,134,128
0.196
1,788,141
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,388,873
7,668,042
0.181
1,388,873
58,493
0
283,039
4.21%
0.00%
20.38%
58,493
0
283,039
1,388,873
7,668,042
0.181
1,388,873
6,554
0
25,717
0.47%
0.00%
1.85%
6,554
0
25,717
1,388,873
7,668,042
0.181
1,388,873
223
0
327
0.02%
0.00%
0.02%
223
0
327
1,388,873
7,668,042
0.181
1,388,873
26
0
26
0.00%
0.00%
0.00%
26
0
26
1,388,873
7,668,042
0.181
1,388,873
1
0
0
0.00%
0.00%
0.00%
1
0
0
1,388,873
7,668,042
0.181
1,388,873
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,388,873
7,668,042
0.181
1,388,873
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,388,873
7,668,042
0.181
1,388,873
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,388,873
7,668,042
0.181
1,388,873
0
0
0
0.00%
0.00%
0.00%
0
0
0
203,913
1,151,288
0.177
203,913
2,888
0
16,974
1.42%
0.00%
8.32%
2,888
0
16,974
203,913
1,151,288
0.177
203,913
298
0
1,347
0.15%
0.00%
0.66%
298
0
1,347
203,913
1,151,288
0.177
203,913
13
0
29
0.01%
0.00%
0.01%
13
0
29
203,913
1,151,288
0.177
203,913
2
0
2
0.00%
0.00%
0.00%
2
0
2
203,913
1,151,288
0.177
203,913
0
0
0
0.00%
0.00%
0.00%
0
0
0
203,913
1,151,288
0.177
203,913
0
0
0
0.00%
0.00%
0.00%
0
0
0
203,913
1,151,288
0.177
203,913
0
0
0
0.00%
0.00%
0.00%
0
0
0
203,913
1,151,288
0.177
203,913
0
0
0
0.00%
0.00%
0.00%
0
0
0
203,913
1,151,288
0.177
203,913
0
0
0
0.00%
0.00%
0.00%
0
0
0
195,356
314,798
0.621
195,356
42,553
21,156
68,077
21.78%
10.83%
34.85%
42,553
21,156
68,077
195,356
314,798
0.621
195,356
19,851
9,584
33,366
10.16%
4.91%
17.08%
19,851
9,584
33,366
195,356
314,798
0.621
195,356
4,428
523
11,238
2.27%
0.27%
5.75%
4,428
523
11,238
195,356
314,798
0.621
195,356
1,326
68
4,458
0.68%
0.03%
2.28%
1,326
68
4,458
195,356
314,798
0.621
195,356
145
2
581
0.07%
0.00%
0.30%
145
2
581
195,356
314,798
0.621
195,356
1
0
5
0.00%
0.00%
0.00%
1
0
5
195,356
314,798
0.621
195,356
0
0
0
0.00%
0.00%
0.00%
0
0
0
195,356
314,798
0.621
195,356
0
0
0
0.00%
0.00%
0.00%
0
0
0
195,356
314,798
0.621
195,356
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 76 of 114
December 2016

-------
C.5 - CL with OT
Source Water Type
Threshold
Total
Number of
National
Number
MR Ratio
National
Number of
Number of
UCMR 2 MRs
Predicted to
have Any
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
(ng/L)


Exceeding
Threshold 
National
Extrapolation





UCMR 2 MRs
Systems

MRs
Detects
Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
14
13
1.077
14
7
4
10
47.31%
30.11%
71.00%
7
4
10

2
14
13
1.077
14
3

5
21.05%
10.26%
33.97%
3
1
5

6
14
13
1.077
14
1
0
1
3.78%
0.78%
8.42%
1
0
1

10
14
13
1.077
14
0
0
0
0.99%
0.10%
2.76%
0
0
0
All MRs Only
20
14
13
1.077
14
0
0
0
0.09%
0.00%
0.32%
0
0
0

60
14
13
1.077
14
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
14
13
1.077
14
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
14
13
1.077
14
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
14

1.077
14
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
4
6
0.667
4
2

3
47.16%
25.08%
77.13%
2
1
3

2
4
6
0.667
4
1
0
1
17.09%
3.15%
31.60%
1
0
1

6
4
6
0.667
4
0
0
0
1.74%
0.03%
6.14%
0
0
0
MRs Only at
10
4
6
0.667
4
0
0
0
0.32%
0.00%
1.29%
0
0
0
Surface Water
20
4
6
0.667
4
0
0
0
0.02%
0.00%
0.07%
0
0
0
Systems
60
4
6
0.667
4
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
4
6
0.667
4
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
4
6
0.667
4
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
4
6
0.667
4
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
3
4
0.750
3
0
0
1
12.03%
0.02%
40.76%
0
0
1

2
3
4
0.750
3
0
0
0
1.52%
0.00%
8.65%
0
0
0

6
3
4
0.750
3
0
0
0
0.07%
0.00%
0.24%
0
0
0
MRs Only at
10
3
4
0.750
3
0
0
0
0.01%
0.00%
0.02%
0
0
0
Ground Water
20
3
4
0.750
3
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
3
4
0.750
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
4
0.750
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
4
0.750
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
4
0.750
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
7
3
2.333
7
4
3
6
62.53%
45.88%
80.46%
4
3
6

2
7
3
2.333
7
2

3
31.67%
18.72%
46.17%
2
1
3

6
7
3
2.333
7
0
0
1
6.53%
1.54%
13.23%
0
0
1
MRs Only at
10
7
3
2.333
7
0
0
0
1.79%
0.20%
4.78%
0
0
0
Mixed Water
20
7
3
2.333
7
0
0
0
0.17%
0.01%
0.60%
0
0
0
Systems
60
7
3
2.333
7
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
7
3
2.333
7
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
7
3
2.333
7
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
7
3
2.333
7
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 77 of 114
December 2016

-------
C.5 - CL with OT
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
1,555,911
9,134,128
0.170
1,555,911
480,841
92,677
1,323,715
30.90%
5.96%
85.08%
480,841
92,677
1,323,715
1,555,911
9,134,128
0.170
1,555,911
107,674
28,712
343,256
6.92%
1.85%
22.06%
107,674
28,712
343,256
1,555,911
9,134,128
0.170
1,555,911
11,651
1,937
29,589
0.75%
0.12%
1.90%
11,651
1,937
29,589
1,555,911
9,134,128
0.170
1,555,911
2,756
253
8,151
0.18%
0.02%
0.52%
2,756
253
8,151
1,555,911
9,134,128
0.170
1,555,911
228
8
836
0.01%
0.00%
0.05%
228
8
836
1,555,911
9,134,128
0.170
1,555,911
1
0
5
0.00%
0.00%
0.00%
1
0
5
1,555,911
9,134,128
0.170
1,555,911
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,555,911
9,134,128
0.170
1,555,911
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,555,911
9,134,128
0.170
1,555,911
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,355,539
7,668,042
0.177
1,355,539
391,501
35,708
1,182,562
28.88%
2.63%
87.24%
391,501
35,708
1,182,562
1,355,539
7,668,042
0.177
1,355,539
67,503
5,914
279,920
4.98%
0.44%
20.65%
67,503
5,914
279,920
1,355,539
7,668,042
0.177
1,355,539
3,646
56
13,321
0.27%
0.00%
0.98%
3,646
56
13,321
1,355,539
7,668,042
0.177
1,355,539
569
3
2,265
0.04%
0.00%
0.17%
569
3
2,265
1,355,539
7,668,042
0.177
1,355,539
27
0
108
0.00%
0.00%
0.01%
27
0
108
1,355,539
7,668,042
0.177
1,355,539
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,355,539
7,668,042
0.177
1,355,539
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,355,539
7,668,042
0.177
1,355,539
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,355,539
7,668,042
0.177
1,355,539
0
0
0
0.00%
0.00%
0.00%
0
0
0
51,935
1,151,288
0.045
51,935
6,413
7
25,219
12.35%
0.01%
48.56%
6,413
7
25,219
51,935
1,151,288
0.045
51,935
793
0
4,349
1.53%
0.00%
8.37%
793
0
4,349
51,935
1,151,288
0.045
51,935
31
0
144
0.06%
0.00%
0.28%
31
0
144
51,935
1,151,288
0.045
51,935
4
0
14
0.01%
0.00%
0.03%
4
0
14
51,935
1,151,288
0.045
51,935
0
0
0
0.00%
0.00%
0.00%
0
0
0
51,935
1,151,288
0.045
51,935
0
0
0
0.00%
0.00%
0.00%
0
0
0
51,935
1,151,288
0.045
51,935
0
0
0
0.00%
0.00%
0.00%
0
0
0
51,935
1,151,288
0.045
51,935
0
0
0
0.00%
0.00%
0.00%
0
0
0
51,935
1,151,288
0.045
51,935
0
0
0
0.00%
0.00%
0.00%
0
0
0
148,437
314,798
0.472
148,437
82,927
56,963
115,934
55.87%
38.38%
78.10%
82,927
56,963
115,934
148,437
314,798
0.472
148,437
39,378
22,798
58,987
26.53%
15.36%
39.74%
39,378
22,798
58,987
148,437
314,798
0.472
148,437
7,975
1,881
16,123
5.37%
1.27%
10.86%
7,975
1,881
16,123
148,437
314,798
0.472
148,437
2,184
249
5,872
1.47%
0.17%
3.96%
2,184
249
5,872
148,437
314,798
0.472
148,437
201
8
728
0.14%
0.01%
0.49%
201
8
728
148,437
314,798
0.472
148,437
1
0
4
0.00%
0.00%
0.00%
1
0
4
148,437
314,798
0.472
148,437
0
0
0
0.00%
0.00%
0.00%
0
0
0
148,437
314,798
0.472
148,437
0
0
0
0.00%
0.00%
0.00%
0
0
0
148,437
314,798
0.472
148,437
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 78 of 114
December 2016

-------
C.5 - CL with OT
Source Water Type
Threshold (ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted to
have Any Detects
Exceeding
Threshold 
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation












Exceeding
Threshold
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
38
110
1.640
181
4
1
10
9.70%
3.18%
25.55%
13
1
54

2
38
110
1.640
181
1
1
3
3.42%
1.45%
7.41%
3
1
10

6
38
110
1.640
181
0
0
1
0.69%
0.08%
1.79%
0
0
1

10
38
110
1.640
181
0
0
0
0.20%
0.01%
0.69%
0
0
0
All EPs Only
20
38
110
1.640
181
0
0
0
0.02%
0.00%
0.09%
0
0
0

60
38
110
1.640
181
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
38
110
1.640
181
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
38
110
1.640
181
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
38
110
1.640
181
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
7
21
0.952
20
0
0
2
6.21%
0.00%
34.69%
2
0
11

2
7
21
0.952
20
0
0
0
0.73%
0.00%
3.77%
0
0
1

6
7
21
0.952
20
0
0
0
0.03%
0.00%
0.06%
0
0
0
EPs Only at Surface
Water Systems
10
7
21
0.952
20
0
0
0
0.00%
0.00%
0.01%
0
0
0
20
7
21
0.952
20
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
7
21
0.952
20
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
7
21
0.952
20
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
7
21
0.952
20
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
7
21
0.952
20
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
19
44
1.547
67
1
0
3
3.34%
0.00%
14.06%
4
0
14

2
19
44
1.547
67
0
0
1
0.47%
0.00%
2.72%
1
0
3

6
19
44
1.547
67
0
0
0
0.03%
0.00%
0.14%
0
0
0
EPs Only at Ground
Water Systems
10
19
44
1.547
67
0
0
0
0.01%
0.00%
0.02%
0
0
0
20
19
44
1.547
67
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
19
44
1.547
67
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
19
44
1.547
67
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
19
44
1.547
67
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
19
44
1.547
67
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
12
46
2.044
94
3
1
5
21.80%
10.08%
38.42%
8
1
29

2
12
46
2.044
94
1
1
2
9.66%
4.59%
16.96%
2
1
5

6
12
46
2.044
94
0
0
1
2.13%
0.25%
5.41%
0
0
1
EPs Only at
10
12
46
2.044
94
0
0
0
0.64%
0.03%
2.14%
0
0
0
Mixed Water
20
12
46
2.044
94
0
0
0
0.07%
0.00%
0.28%
0
0
0
Systems
60
12
46
2.044
94
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
12
46
2.044
94
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
12
46
2.044
94
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
12
46
2.044
94
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 79 of 114
December 2016

-------
C.5 - CL with OT
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
1,889,175
11,815,422
0.234
2,766,023
110,295
21,156
400,968
5.84%
1.12%
21.22%
165,087
21,157
651,438
1,889,175
11,815,422
0.234
2,766,023
27,519
9,584
64,269
1.46%
0.51%
3.40%
34,389
9,584
99,428
1,889,175
11,815,422
0.234
2,766,023
4,704
523
11,697
0.25%
0.03%
0.62%
5,025
523
12,562
1,889,175
11,815,422
0.234
2,766,023
1,360
68
4,498
0.07%
0.00%
0.24%
1,409
68
4,591
1,889,175
11,815,422
0.234
2,766,023
146
2
582
0.01%
0.00%
0.03%
148
2
585
1,889,175
11,815,422
0.234
2,766,023
1
0
5
0.00%
0.00%
0.00%
1
0
5
1,889,175
11,815,422
0.234
2,766,023
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,889,175
11,815,422
0.234
2,766,023
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,889,175
11,815,422
0.234
2,766,023
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,412,693
7,894,773
0.184
1,451,221
60,280
0
296,692
4.27%
0.00%
21.00%
63,156
0
318,723
1,412,693
7,894,773
0.184
1,451,221
6,770
0
26,477
0.48%
0.00%
1.87%
7,118
0
27,696
1,412,693
7,894,773
0.184
1,451,221
233
0
334
0.02%
0.00%
0.02%
248
0
346
1,412,693
7,894,773
0.184
1,451,221
27
0
27
0.00%
0.00%
0.00%
30
0
27
1,412,693
7,894,773
0.184
1,451,221
1
0
0
0.00%
0.00%
0.00%
1
0
0
1,412,693
7,894,773
0.184
1,451,221
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,412,693
7,894,773
0.184
1,451,221
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,412,693
7,894,773
0.184
1,451,221
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,412,693
7,894,773
0.184
1,451,221
0
0
0
0.00%
0.00%
0.00%
0
0
0
229,323
2,174,064
0.171
371,010
4,107
0
20,798
1.79%
0.00%
9.07%
10,905

42,122
229,323
2,174,064
0.171
371,010
493
0
2,296
0.21%
0.00%
1.00%
1,578
0
7,588
229,323
2,174,064
0.171
371,010
26
0
83
0.01%
0.00%
0.04%
101
0
385
229,323
2,174,064
0.171
371,010
5
0
10
0.00%
0.00%
0.00%
20
0
55
229,323
2,174,064
0.171
371,010
0
0
0
0.00%
0.00%
0.00%
1
0
2
229,323
2,174,064
0.171
371,010
0
0
0
0.00%
0.00%
0.00%
0
0
0
229,323
2,174,064
0.171
371,010
0
0
0
0.00%
0.00%
0.00%
0
0
0
229,323
2,174,064
0.171
371,010
0
0
0
0.00%
0.00%
0.00%
0
0
0
229,323
2,174,064
0.171
371,010
0
0
0
0.00%
0.00%
0.00%
0
0
0
247,159
1,746,585
0.540
943,793
45,908
21,156
83,478
18.57%
8.56%
33.78%
91,026
21,156
290,593
247,159
1,746,585
0.540
943,793
20,255
9,584
35,496
8.20%
3.88%
14.36%
25,692
9,584
64,143
247,159
1,746,585
0.540
943,793
4,445
523
11,279
1.80%
0.21%
4.56%
4,676
523
11,831
247,159
1,746,585
0.540
943,793
1,328
68
4,461
0.54%
0.03%
1.81%
1,360
68
4,509
247,159
1,746,585
0.540
943,793
145
2
581
0.06%
0.00%
0.24%
146
2
582
247,159
1,746,585
0.540
943,793
1
0
5
0.00%
0.00%
0.00%
1
0
5
247,159
1,746,585
0.540
943,793
0
0
0
0.00%
0.00%
0.00%
0
0
0
247,159
1,746,585
0.540
943,793
0
0
0
0.00%
0.00%
0.00%
0
0
0
247,159
1,746,585
0.540
943,793
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 80 of 114
December 2016

-------
C.5 - CL with OT
Source Water Type
Threshold
Total
Number of
National
Number
MR Ratio
National
Number of
Number of
UCMR 2 MRs
Predicted to
have Any
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
(ng/L)


Exceeding
Threshold 
National
Extrapolation





UCMR 2 MRs
Systems

MRs
Detects
Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
26
110
1.224
135
9
4
16
33.40%
16.26%
61.43%
32
4
81

2
26
110
1.224
135
3

6
12.53%
5.52%
24.69%
7
1
27

6
26
110
1.224
135
1
0
1
2.09%
0.42%
4.82%
1
0
2

10
26
110
1.224
135
0
0
0
0.54%
0.06%
1.52%
0
0
1
All MRs Only
20
26
110
1.224
135
0
0
0
0.05%
0.00%
0.17%
0
0
0

60
26
110
1.224
135
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
26
110
1.224
135
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
26
110
1.224
135
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
26
110
1.224
135
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
6
21
0.905
19
3

5
42.85%
16.72%
84.10%
7
1
18

2
6
21
0.905
19
1
0
2
13.31%
2.10%
32.57%
2
0
7

6
6
21
0.905
19
0
0
0
1.23%
0.02%
4.50%
0
0
0
MRs Only at
10
6
21
0.905
19
0
0
0
0.22%
0.00%
0.90%
0
0
0
Surface Water
20
6
21
0.905
19
0
0
0
0.01%
0.00%
0.05%
0
0
0
Systems
60
6
21
0.905
19
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
6
21
0.905
19
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
6
21
0.905
19
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
6
21
0.905
19
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
11
44
1.522
66
1
0
4
9.52%
0.04%
32.06%
6
0
19

2
11
44
1.522
66
0
0
1
1.03%
0.00%
5.32%
1
0
3

6
11
44
1.522
66
0
0
0
0.04%
0.00%
0.15%
0
0
0
MRs Only at
10
11
44
1.522
66
0
0
0
0.01%
0.00%
0.01%
0
0
0
Ground Water
20
11
44
1.522
66
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
11
44
1.522
66
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
11
44
1.522
66
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
11
44
1.522
66
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
11
44
1.522
66
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
9
46
1.087
50
5
3
7
56.29%
35.78%
82.21%
19
3
43

2
9
46
1.087
50
2

4
26.06%
14.56%
43.10%
5
1
17

6
9
46
1.087
50
0
0
1
5.16%
1.20%
10.73%
1
0
2
MRs Only at
10
9
46
1.087
50
0
0
0
1.41%
0.16%
3.77%
0
0
0
Mixed Water
20
9
46
1.087
50
0
0
0
0.13%
0.01%
0.47%
0
0
0
Systems
60
9
46
1.087
50
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
9
46
1.087
50
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
9
46
1.087
50
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
9
46
1.087
50
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 81 of 114
December 2016

-------
C.5 - CL with OT
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
1,631,968
11,815,422
0.183
2,156,795
500,072
92,789
1,384,303
30.64%
5.69%
84.82%
645,533
94,222
1,803,371
1,631,968
11,815,422
0.183
2,156,795
110,804
28,712
360,230
6.79%
1.76%
22.07%
136,604
28,714
493,502
1,631,968
11,815,422
0.183
2,156,795
11,798
1,937
30,338
0.72%
0.12%
1.86%
13,218
1,937
37,768
1,631,968
11,815,422
0.183
2,156,795
2,777
253
8,232
0.17%
0.02%
0.50%
2,995
253
9,104
1,631,968
11,815,422
0.183
2,156,795
228
8
838
0.01%
0.00%
0.05%
238
8
859
1,631,968
11,815,422
0.183
2,156,795
1
0
5
0.00%
0.00%
0.00%
1
0
5
1,631,968
11,815,422
0.183
2,156,795
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,631,968
11,815,422
0.183
2,156,795
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,631,968
11,815,422
0.183
2,156,795
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,379,359
7,894,773
0.180
1,417,887
399,021
35,708
1,205,690
28.93%
2.59%
87.41%
411,147
35,709
1,243,085
1,379,359
7,894,773
0.180
1,417,887
68,624
5,914
286,347
4.98%
0.43%
20.76%
70,422
5,914
296,633
1,379,359
7,894,773
0.180
1,417,887
3,683
56
13,499
0.27%
0.00%
0.98%
3,743
56
13,781
1,379,359
7,894,773
0.180
1,417,887
573
3
2,280
0.04%
0.00%
0.17%
579
3
2,303
1,379,359
7,894,773
0.180
1,417,887
27
0
108
0.00%
0.00%
0.01%
27
0
108
1,379,359
7,894,773
0.180
1,417,887
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,379,359
7,894,773
0.180
1,417,887
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,379,359
7,894,773
0.180
1,417,887
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,379,359
7,894,773
0.180
1,417,887
0
0
0
0.00%
0.00%
0.00%
0
0
0
79,396
2,174,064
0.107
232,524
9,480
15
40,728
11.94%
0.02%
51.30%
26,585
59
127,206
79,396
2,174,064
0.107
232,524
1,176
0
6,743
1.48%
0.00%
8.49%
3,313
0
20,090
79,396
2,174,064
0.107
232,524
44
0
212
0.06%
0.00%
0.27%
116
0
591
79,396
2,174,064
0.107
232,524
5
0
19
0.01%
0.00%
0.02%
14
0
51
79,396
2,174,064
0.107
232,524
0
0
0
0.00%
0.00%
0.00%
0
0
1
79,396
2,174,064
0.107
232,524
0
0
0
0.00%
0.00%
0.00%
0
0
0
79,396
2,174,064
0.107
232,524
0
0
0
0.00%
0.00%
0.00%
0
0
0
79,396
2,174,064
0.107
232,524
0
0
0
0.00%
0.00%
0.00%
0
0
0
79,396
2,174,064
0.107
232,524
0
0
0
0.00%
0.00%
0.00%
0
0
0
173,213
1,746,585
0.290
506,384
91,570
57,066
137,886
52.87%
32.95%
79.60%
207,802
58,453
433,080
173,213
1,746,585
0.290
506,384
41,004
22,798
67,140
23.67%
13.16%
38.76%
62,869
22,800
176,778
173,213
1,746,585
0.290
506,384
8,071
1,881
16,626
4.66%
1.09%
9.60%
9,359
1,881
23,397
173,213
1,746,585
0.290
506,384
2,199
249
5,933
1.27%
0.14%
3.43%
2,402
249
6,750
173,213
1,746,585
0.290
506,384
202
8
730
0.12%
0.00%
0.42%
211
8
750
173,213
1,746,585
0.290
506,384
1
0
4
0.00%
0.00%
0.00%
1
0
4
173,213
1,746,585
0.290
506,384
0
0
0
0.00%
0.00%
0.00%
0
0
0
173,213
1,746,585
0.290
506,384
0
0
0
0.00%
0.00%
0.00%
0
0
0
173,213
1,746,585
0.290
506,384
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 82 of 114
December 2016

-------
C.6-0T Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All EPs Only
0.6
1
9
1.000
9
0
0
1
32.56%
0.00%
98.16%
3
0
9
2
1
9
1.000
9
0
0
0
6.54%
0.00%
37.46%
1
0
3
6
1
9
1.000
9
0
0
0
0.38%
0.00%
1.73%
0
0
0
10
1
9
1.000
9
0
0
0
0.06%
0.00%
0.21%
0
0
0
20
1
9
1.000
9
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
1
9
1.000
9
0
0
1
32.56%
0.00%
98.16%
3
0
9
2
1
9
1.000
9
0
0
0
6.54%
0.00%
37.46%
1
0
3
6
1
9
1.000
9
0
0
0
0.38%
0.00%
1.73%
0
0
0
10
1
9
1.000
9
0
0
0
0.06%
0.00%
0.21%
0
0
0
20
1
9
1.000
9
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 83 of 114
December 2016

-------
C.6-0T Only
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
20
22,661
0.500
11,331
7
0
20
32.56%
0.00%
98.16%
3,689
0
11,122
20
22,661
0.500
11,331
1
0
7
6.54%
0.00%
37.46%
741
0
4,244
20
22,661
0.500
11,331
0
0
0
0.38%
0.00%
1.73%
43
0
197
20
22,661
0.500
11,331
0
0
0
0.06%
0.00%
0.21%
7
0
24
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.01%
0
0
1
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
22,661
0.500
11,331
7
0
20
32.56%
0.00%
98.16%
3,689
0
11,122
20
22,661
0.500
11,331
1
0
7
6.54%
0.00%
37.46%
741
0
4,244
20
22,661
0.500
11,331
0
0
0
0.38%
0.00%
1.73%
43
0
197
20
22,661
0.500
11,331
0
0
0
0.06%
0.00%
0.21%
7
0
24
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.01%
0
0
1
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 84 of 114
December 2016

-------
C.6-0T Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation



Exceeding
Threshold
Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)

0.6
1
9
1.000
9
1
0
1
59.49%
0.37%
99.95%
5
0
9

2
1
9
1.000
9
0
0
1
15.20%
0.00%
68.06%
1
0
6

6
1
9
1.000
9
0
0
0
0.91%
0.00%
4.88%
0
0
0

10
1
9
1.000
9
0
0
0
0.13%
0.00%
0.65%
0
0
0
All MRs Only
20
1
9
1.000
9
0
0
0
0.01%
0.00%
0.02%
0
0
0

60
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
9
1.000
9
1
0
1
59.49%
0.37%
99.95%
5
0
9

2
1
9
1.000
9
0
0
1
15.20%
0.00%
68.06%
1
0
6

6
1
9
1.000
9
0
0
0
0.91%
0.00%
4.88%
0
0
0
MRs Only at
10
1
9
1.000
9
0
0
0
0.13%
0.00%
0.65%
0
0
0
Surface Water
20
1
9
1.000
9
0
0
0
0.01%
0.00%
0.02%
0
0
0
Systems
60
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
9
1.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 85 of 114
December 2016

-------
C.6-0T Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
20
22,661
0.500
11,331
12
0
20
59.49%
0.37%
99.95%
6,740
42
11,325
20
22,661
0.500
11,331
3
0
14
15.20%
0.00%
68.06%
1,723
0
7,712
20
22,661
0.500
11,331
0
0
1
0.91%
0.00%
4.88%
104
0
553
20
22,661
0.500
11,331
0
0
0
0.13%
0.00%
0.65%
15
0
74
20
22,661
0.500
11,331
0
0
0
0.01%
0.00%
0.02%
1
0
2
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
22,661
0.500
11,331
12
0
20
59.49%
0.37%
99.95%
6,740
42
11,325
20
22,661
0.500
11,331
3
0
14
15.20%
0.00%
68.06%
1,723
0
7,712
20
22,661
0.500
11,331
0
0
1
0.91%
0.00%
4.88%
104
0
553
20
22,661
0.500
11,331
0
0
0
0.13%
0.00%
0.65%
15
0
74
20
22,661
0.500
11,331
0
0
0
0.01%
0.00%
0.02%
1
0
2
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
22,661
0.500
11,331
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 86 of 114
December 2016

-------
C.6-0T Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation



Exceeding
Threshold
Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)

0.6
8
36
1.660
60
2
1
4
19.86%
10.24%
43.89%
12
6
26

2
8
36
1.660
60
1
1
2
11.91%
10.17%
20.99%
7
6
13

6
8
36
1.660
60
1
1
1
8.88%
5.71%
10.63%
5
3
6

10
8
36
1.660
60
1
0
1
6.17%
2.17%
9.79%
4
1
6
All EPs Only
20
8
36
1.660
60
0
0
1
2.21%
0.27%
5.98%
1
0
4

60
8
36
1.660
60
0
0
0
0.11%
0.00%
0.42%
0
0
0

100
8
36
1.660
60
0
0
0
0.02%
0.00%
0.06%
0
0
0

200
8
36
1.660
60
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
8
36
1.660
60
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
2
12
1.000
12
1
1
2
62.62%
50.00%
99.38%
8
6
12

2
2
12
1.000
12
1
1
1
52.58%
49.70%
71.89%
6
6
9

6
2
12
1.000
12
1
1
1
42.98%
27.89%
49.90%
5
3
6
EPs Only at Surface
Water Systems
10
2
12
1.000
12
1
0
1
30.04%
10.61%
47.53%
4
1
6
20
2
12
1.000
12
0
0
1
10.80%
1.33%
29.22%
1
0
4
60
2
12
1.000
12
0
0
0
0.55%
0.01%
2.05%
0
0
0

100
2
12
1.000
12
0
0
0
0.08%
0.00%
0.28%
0
0
0

200
2
12
1.000
12
0
0
0
0.00%
0.00%
0.01%
0
0
0

600
2
12
1.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
6
24
2.000
47
1
0
2
8.85%
0.00%
29.61%
4
0
14

2
6
24
2.000
47
0
0
0
1.44%
0.00%
7.88%
1
0
4

6
6
24
2.000
47
0
0
0
0.10%
0.00%
0.52%
0
0
0
EPs Only at Ground
Water Systems
10
6
24
2.000
47
0
0
0
0.02%
0.00%
0.08%
0
0
0
20
6
24
2.000
47
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
6
24
2.000
47
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
6
24
2.000
47
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
6
24
2.000
47
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
6
24
2.000
47
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
10
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 87 of 114
December 2016

-------
C.6-0T Only
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
118,233
1,021,805
0.518
529,065
22,062
10,905
52,446
35.12%
26.04%
60.30%
185,790
137,748
319,006
118,233
1,021,805
0.518
529,065
12,834
10,832
23,457
27.66%
25.87%
37.59%
146,336
136,855
198,897
118,233
1,021,805
0.518
529,065
9,465
6,057
11,395
22.40%
14.46%
26.28%
118,513
76,519
139,061
118,233
1,021,805
0.518
529,065
6,568
2,302
10,430
15.65%
5.50%
24.79%
82,794
29,078
131,144
118,233
1,021,805
0.518
529,065
2,357
289
6,375
5.63%
0.69%
15.22%
29,766
3,653
80,511
118,233
1,021,805
0.518
529,065
121
2
446
0.29%
0.00%
1.07%
1,526
25
5,635
118,233
1,021,805
0.518
529,065
18
0
61
0.04%
0.00%
0.15%
232

775
118,233
1,021,805
0.518
529,065
1
0
2
0.00%
0.00%
0.01%
11
0
29
118,233
1,021,805
0.518
529,065
0
0
0
0.00%
0.00%
0.00%
0
0
0
16,153
408,139
0.500
204,070
12,227
10,903
16,088
75.70%
67.50%
99.60%
154,478
137,741
203,249
16,153
408,139
0.500
204,070
11,161
10,832
13,144
69.10%
67.06%
81.38%
141,011
136,855
166,065
16,153
408,139
0.500
204,070
9,352
6,057
10,876
57.90%
37.50%
67.34%
118,154
76,519
137,412
16,153
408,139
0.500
204,070
6,548
2,302
10,364
40.54%
14.25%
64.16%
82,731
29,078
130,933
16,153
408,139
0.500
204,070
2,356
289
6,372
14.58%
1.79%
39.45%
29,762
3,653
80,501
16,153
408,139
0.500
204,070
121
2
446
0.75%
0.01%
2.76%
1,526
25
5,635
16,153
408,139
0.500
204,070
18
0
61
0.11%
0.00%
0.38%
232

775
16,153
408,139
0.500
204,070
1
0
2
0.01%
0.00%
0.01%
11
0
29
16,153
408,139
0.500
204,070
0
0
0
0.00%
0.00%
0.00%
0
0
0
102,080
613,666
0.530
324,995
9,835
2
36,359
9.63%
0.00%
35.62%
31,312
7
115,756
102,080
613,666
0.530
324,995
1,672
0
10,313
1.64%
0.00%
10.10%
5,325
0
32,832
102,080
613,666
0.530
324,995
113
0
518
0.11%
0.00%
0.51%
360
0
1,650
102,080
613,666
0.530
324,995
20
0
66
0.02%
0.00%
0.06%
64
0
211
102,080
613,666
0.530
324,995
1
0
3
0.00%
0.00%
0.00%
4
0
10
102,080
613,666
0.530
324,995
0
0
0
0.00%
0.00%
0.00%
0
0
0
102,080
613,666
0.530
324,995
0
0
0
0.00%
0.00%
0.00%
0
0
0
102,080
613,666
0.530
324,995
0
0
0
0.00%
0.00%
0.00%
0
0
0
102,080
613,666
0.530
324,995
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 88 of 114
December 2016

-------
C.6-0T Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
All MRs Only
0.6
7
36
1.440
52
3
2
5
43.82%
25.61%
67.54%
23
13
35
2
7
36
1.440
52
2
1
3
23.80%
14.50%
37.78%
12
7
20
6
7
36
1.440
52
1
1
2
13.42%
11.65%
18.48%
7
6
10
10
7
36
1.440
52
1
1
1
11.19%
8.58%
13.00%
6
4
7
20
7
36
1.440
52
1
0
1
6.75%
2.26%
11.02%
3
1
6
60
7
36
1.440
52
0
0
0
0.70%
0.04%
2.60%
0
0
1
100
7
36
1.440
52
0
0
0
0.12%
0.00%
0.55%
0
0
0
200
7
36
1.440
52
0
0
0
0.01%
0.00%
0.03%
0
0
0
600
7
36
1.440
52
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
2
12
1.000
12
2
2
2
99.62%
98.21%
100.00%
12
12
12
2
2
12
1.000
12
2
1
2
84.76%
61.35%
99.34%
10
7
12
6
2
12
1.000
12
1
1
1
55.67%
49.38%
71.06%
7
6
9
10
2
12
1.000
12
1
1
1
47.18%
36.36%
53.79%
6
4
7
20
2
12
1.000
12
1
0
1
28.61%
9.60%
46.62%
3
1
6
60
2
12
1.000
12
0
0
0
2.95%
0.15%
11.03%
0
0
1
100
2
12
1.000
12
0
0
0
0.51%
0.01%
2.31%
0
0
0
200
2
12
1.000
12
0
0
0
0.02%
0.00%
0.12%
0
0
0
600
2
12
1.000
12
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Ground Water
Systems
0.6
5
24
1.667
40
1
0
3
26.59%
3.19%
57.52%
11
1
23
2
5
24
1.667
40
0
0
1
4.97%
0.03%
18.78%
2
0
7
6
5
24
1.667
40
0
0
0
0.38%
0.00%
2.25%
0
0
1
10
5
24
1.667
40
0
0
0
0.07%
0.00%
0.41%
0
0
0
20
5
24
1.667
40
0
0
0
0.00%
0.00%
0.02%
0
0
0
60
5
24
1.667
40
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
5
24
1.667
40
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
5
24
1.667
40
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
5
24
1.667
40
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 89 of 114
December 2016

-------
C.6-0T Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
116,181
1,021,805
0.511
522,533
44,233
17,686
80,253
56.09%
39.65%
78.11%
293,099
207,179
408,149
116,181
1,021,805
0.511
522,533
19,949
12,115
39,159
38.47%
29.25%
52.95%
201,034
152,865
276,657
116,181
1,021,805
0.511
522,533
11,867
10,660
15,435
27.92%
25.77%
33.07%
145,878
134,682
172,805
116,181
1,021,805
0.511
522,533
10,210
7,732
11,541
24.53%
18.70%
27.23%
128,189
97,688
142,295
116,181
1,021,805
0.511
522,533
6,233
2,088
10,182
15.06%
5.05%
24.59%
78,690
26,379
128,479
116,181
1,021,805
0.511
522,533
643
32
2,405
1.55%
0.08%
5.82%
8,122
410
30,390
116,181
1,021,805
0.511
522,533
112
2
504
0.27%
0.01%
1.22%
1,414
27
6,372
116,181
1,021,805
0.511
522,533
5
0
27
0.01%
0.00%
0.06%
68
0
337
116,181
1,021,805
0.511
522,533
0
0
0
0.00%
0.00%
0.00%
0
0
1
16,153
408,139
0.500
204,070
16,113
15,965
16,152
99.76%
98.84%
100.00%
203,572
201,698
204,070
16,153
408,139
0.500
204,070
14,552
12,094
16,083
90.09%
74.88%
99.57%
183,854
152,799
203,190
16,153
408,139
0.500
204,070
11,439
10,660
13,086
70.82%
66.00%
81.02%
144,513
134,682
165,327
16,153
408,139
0.500
204,070
10,125
7,732
11,169
62.68%
47.87%
69.15%
127,918
97,688
141,111
16,153
408,139
0.500
204,070
6,227
2,088
10,165
38.55%
12.93%
62.93%
78,672
26,379
128,425
16,153
408,139
0.500
204,070
643
32
2,405
3.98%
0.20%
14.89%
8,122
410
30,390
16,153
408,139
0.500
204,070
112
2
504
0.69%
0.01%
3.12%
1,414
27
6,372
16,153
408,139
0.500
204,070
5
0
27
0.03%
0.00%
0.17%
68
0
337
16,153
408,139
0.500
204,070
0
0
0
0.00%
0.00%
0.00%
0
0
1
100,029
613,666
0.519
318,463
28,120
1,721
64,101
28.11%
1.72%
64.08%
89,527
5,481
204,079
100,029
613,666
0.519
318,463
5,396
21
23,076
5.39%
0.02%
23.07%
17,181
66
73,467
100,029
613,666
0.519
318,463
429
0
2,349
0.43%
0.00%
2.35%
1,365
0
7,477
100,029
613,666
0.519
318,463
85
0
372
0.08%
0.00%
0.37%
271
0
1,185
100,029
613,666
0.519
318,463
6
0
17
0.01%
0.00%
0.02%
18
0
54
100,029
613,666
0.519
318,463
0
0
0
0.00%
0.00%
0.00%
0
0
0
100,029
613,666
0.519
318,463
0
0
0
0.00%
0.00%
0.00%
0
0
0
100,029
613,666
0.519
318,463
0
0
0
0.00%
0.00%
0.00%
0
0
0
100,029
613,666
0.519
318,463
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 90 of 114
December 2016

-------
C.6-0T Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation



Exceeding
Threshold
Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
9
3
3.000
9
1
0
5
14.20%
0.00%
51.34%
1
0
5

2
9
3
3.000
9
0
0
1
2.47%
0.00%
13.58%
0
0
1

6
9
3
3.000
9
0
0
0
0.18%
0.00%
0.74%
0
0
0

10
9
3
3.000
9
0
0
0
0.04%
0.00%
0.10%
0
0
0
All EPs Only
20
9
3
3.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

60
9
3
3.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
9
3
3.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
9
3
3.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
9
3
3.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
3
1
3.000
3
1
0
2
21.72%
0.01%
62.03%
1
0
2

2
3
1
3.000
3
0
0
1
4.01%
0.00%
20.20%
0
0
1

6
3
1
3.000
3
0
0
0
0.27%
0.00%
1.40%
0
0
0
EPs Only at Surface
Water Systems
10
3
1
3.000
3
0
0
0
0.05%
0.00%
0.20%
0
0
0
20
3
1
3.000
3
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
3
1
3.000
3
0
0
1
8.61%
0.00%
41.60%
0
0
1

2
3
1
3.000
3
0
0
0
1.49%
0.00%
8.89%
0
0
0

6
3
1
3.000
3
0
0
0
0.15%
0.00%
0.43%
0
0
0
EPs Only at Ground
Water Systems
10
3
1
3.000
3
0
0
0
0.04%
0.00%
0.06%
0
0
0
20
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
3
1
3.000
3
0
0
2
12.26%
0.00%
50.39%
0
0
2

2
3
1
3.000
3
0
0
0
1.90%
0.00%
11.64%
0
0
0

6
3
1
3.000
3
0
0
0
0.13%
0.00%
0.40%
0
0
0
EPs Only at
10
3
1
3.000
3
0
0
0
0.03%
0.00%
0.04%
0
0
0
Mixed Water
20
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 91 of 114
December 2016

-------
C.6-0T Only
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
578,899
701,961
0.825
578,899
107,647
25
348,933
18.60%
0.00%
60.28%
107,647
25
348,933
578,899
701,961
0.825
578,899
19,034
0
96,530
3.29%
0.00%
16.67%
19,034
0
96,530
578,899
701,961
0.825
578,899
1,277
0
6,528
0.22%
0.00%
1.13%
1,277
0
6,528
578,899
701,961
0.825
578,899
242
0
855
0.04%
0.00%
0.15%
242
0
855
578,899
701,961
0.825
578,899
17
0
29
0.00%
0.00%
0.01%
17
0
29
578,899
701,961
0.825
578,899
0
0
0
0.00%
0.00%
0.00%
0
0
0
578,899
701,961
0.825
578,899
0
0
0
0.00%
0.00%
0.00%
0
0
0
578,899
701,961
0.825
578,899
0
0
0
0.00%
0.00%
0.00%
0
0
0
578,899
701,961
0.825
578,899
0
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
445,327
0.928
413,217
90,354
25
267,659
21.87%
0.01%
64.77%
90,354
25
267,659
413,217
445,327
0.928
413,217
16,210
0
80,212
3.92%
0.00%
19.41%
16,210
0
80,212
413,217
445,327
0.928
413,217
1,030
0
5,840
0.25%
0.00%
1.41%
1,030
0
5,840
413,217
445,327
0.928
413,217
179
0
776
0.04%
0.00%
0.19%
179
0
776
413,217
445,327
0.928
413,217
10
0
27
0.00%
0.00%
0.01%
10
0
27
413,217
445,327
0.928
413,217
0
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
445,327
0.928
413,217
0
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
445,327
0.928
413,217
0
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
445,327
0.928
413,217
0
0
0
0.00%
0.00%
0.00%
0
0
0
88,922
154,288
0.576
88,922
7,880
0
42,594
8.86%
0.00%
47.90%
7,880
0
42,594
88,922
154,288
0.576
88,922
1,367
0
7,379
1.54%
0.00%
8.30%
1,367
0
7,379
88,922
154,288
0.576
88,922
148
0
384
0.17%
0.00%
0.43%
148
0
384
88,922
154,288
0.576
88,922
42
0
46
0.05%
0.00%
0.05%
42
0
46
88,922
154,288
0.576
88,922
5
0
1
0.01%
0.00%
0.00%
5
0
1
88,922
154,288
0.576
88,922
0
0
0
0.00%
0.00%
0.00%
0
0
0
88,922
154,288
0.576
88,922
0
0
0
0.00%
0.00%
0.00%
0
0
0
88,922
154,288
0.576
88,922
0
0
0
0.00%
0.00%
0.00%
0
0
0
88,922
154,288
0.576
88,922
0
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
102,346
0.750
76,760
9,414
0
38,679
12.26%
0.00%
50.39%
9,414
0
38,679
76,760
102,346
0.750
76,760
1,457
0
8,938
1.90%
0.00%
11.64%
1,457
0
8,938
76,760
102,346
0.750
76,760
99
0
305
0.13%
0.00%
0.40%
99
0
305
76,760
102,346
0.750
76,760
21
0
33
0.03%
0.00%
0.04%
21
0
33
76,760
102,346
0.750
76,760
2
0
1
0.00%
0.00%
0.00%
2
0
1
76,760
102,346
0.750
76,760
0
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
102,346
0.750
76,760
0
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
102,346
0.750
76,760
0
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
102,346
0.750
76,760
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 92 of 114
December 2016

-------
C.6-0T Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation



Exceeding
Threshold
Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
6
3
2.000
6
3
1
5
51.82%
22.50%
89.94%
3
1
5

2
6
3
2.000
6
1
0
2
20.05%
5.19%
41.40%
1
0
2

6
6
3
2.000
6
0
0
1
2.66%
0.12%
8.98%
0
0
1

10
6
3
2.000
6
0
0
0
0.56%
0.01%
2.18%
0
0
0
All MRs Only
20
6
3
2.000
6
0
0
0
0.04%
0.00%
0.14%
0
0
0

60
6
3
2.000
6
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
6
3
2.000
6
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
6
3
2.000
6
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
6
3
2.000
6
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
3
1
3.000
3
2
0
3
54.68%
12.29%
93.19%
2
0
3

2
3
1
3.000
3
0
0
1
12.87%
0.18%
36.16%
0
0
1

6
3
1
3.000
3
0
0
0
0.76%
0.00%
3.98%
0
0
0
MRs Only at
10
3
1
3.000
3
0
0
0
0.11%
0.00%
0.63%
0
0
0
Surface Water
20
3
1
3.000
3
0
0
0
0.01%
0.00%
0.02%
0
0
0
Systems
60
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
2
1
2.000
2
0
0
2
23.62%
0.00%
80.04%
0
0
2

2
2
1
2.000
2
0
0
0
3.73%
0.00%
20.77%
0
0
0

6
2
1
2.000
2
0
0
0
0.19%
0.00%
1.10%
0
0
0
MRs Only at
10
2
1
2.000
2
0
0
0
0.03%
0.00%
0.13%
0
0
0
Ground Water
20
2
1
2.000
2
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
2
1
2.000
2
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
2
1
2.000
2
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
2
1
2.000
2
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
2
1
2.000
2
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
1
1.000
1
1
1
1
99.65%
98.16%
100.00%
1
1
1

2
1
1
1.000
1
1
0
1
74.24%
30.64%
98.38%
1
0
1

6
1
1
1.000
1
0
0
0
13.30%
0.75%
39.71%
0
0
0
MRs Only at
10
1
1
1.000
1
0
0
0
2.97%
0.06%
10.94%
0
0
0
Mixed Water
20
1
1
1.000
1
0
0
0
0.20%
0.00%
0.79%
0
0
0
Systems
60
1
1
1.000
1
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
1
1.000
1
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
1
1.000
1
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
1
1.000
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 93 of 114
December 2016

-------
C.6-0T Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
515,948
701,961
0.735
515,948
272,272
75,417
475,032
52.77%
14.62%
92.07%
272,272
75,417
475,032
515,948
701,961
0.735
515,948
74,731
8,571
213,909
14.48%
1.66%
41.46%
74,731
8,571
213,909
515,948
701,961
0.735
515,948
6,606
193
26,471
1.28%
0.04%
5.13%
6,606
193
26,471
515,948
701,961
0.735
515,948
1,236
16
5,390
0.24%
0.00%
1.04%
1,236
16
5,390
515,948
701,961
0.735
515,948
70
0
293
0.01%
0.00%
0.06%
70
0
293
515,948
701,961
0.735
515,948
0
0
1
0.00%
0.00%
0.00%
0
0
1
515,948
701,961
0.735
515,948
0
0
0
0.00%
0.00%
0.00%
0
0
0
515,948
701,961
0.735
515,948
0
0
0
0.00%
0.00%
0.00%
0
0
0
515,948
701,961
0.735
515,948
0
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
445,327
0.928
413,217
228,550
50,300
387,698
55.31%
12.17%
93.82%
228,550
50,300
387,698
413,217
445,327
0.928
413,217
52,858
732
172,711
12.79%
0.18%
41.80%
52,858
732
172,711
413,217
445,327
0.928
413,217
3,059
1
15,463
0.74%
0.00%
3.74%
3,059

15,463
413,217
445,327
0.928
413,217
456
0
2,488
0.11%
0.00%
0.60%
456
0
2,488
413,217
445,327
0.928
413,217
19
0
88
0.00%
0.00%
0.02%
19
0
88
413,217
445,327
0.928
413,217
0
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
445,327
0.928
413,217
0
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
445,327
0.928
413,217
0
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
445,327
0.928
413,217
0
0
0
0.00%
0.00%
0.00%
0
0
0
77,144
154,288
0.500
77,144
18,224
2
61,747
23.62%
0.00%
80.04%
18,224
2
61,747
77,144
154,288
0.500
77,144
2,876
0
16,026
3.73%
0.00%
20.77%
2,876
0
16,026
77,144
154,288
0.500
77,144
144
0
848
0.19%
0.00%
1.10%
144
0
848
77,144
154,288
0.500
77,144
21
0
104
0.03%
0.00%
0.13%
21
0
104
77,144
154,288
0.500
77,144
1
0
3
0.00%
0.00%
0.00%
1
0
3
77,144
154,288
0.500
77,144
0
0
0
0.00%
0.00%
0.00%
0
0
0
77,144
154,288
0.500
77,144
0
0
0
0.00%
0.00%
0.00%
0
0
0
77,144
154,288
0.500
77,144
0
0
0
0.00%
0.00%
0.00%
0
0
0
77,144
154,288
0.500
77,144
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
102,346
0.250
25,587
25,498
25,116
25,586
99.65%
98.16%
100.00%
25,498
25,116
25,586
25,587
102,346
0.250
25,587
18,996
7,839
25,172
74.24%
30.64%
98.38%
18,996
7,839
25,172
25,587
102,346
0.250
25,587
3,403
192
10,160
13.30%
0.75%
39.71%
3,403
192
10,160
25,587
102,346
0.250
25,587
760
16
2,798
2.97%
0.06%
10.94%
760
16
2,798
25,587
102,346
0.250
25,587
50
0
202
0.20%
0.00%
0.79%
50
0
202
25,587
102,346
0.250
25,587
0
0
1
0.00%
0.00%
0.00%
0
0
1
25,587
102,346
0.250
25,587
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
102,346
0.250
25,587
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
102,346
0.250
25,587
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 94 of 114
December 2016

-------
C.6-0T Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation



Exceeding
Threshold
Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
18
48
1.621
78
3
1
9
18.82%
5.56%
52.04%
16
6
40

2
18
48
1.621
78
1
1
4
7.92%
5.52%
19.49%
8
6
17

6
18
48
1.621
78
1
1
1
4.92%
3.10%
6.19%
5
3
7

10
18
48
1.621
78
1
0
1
3.37%
1.18%
5.37%
4
1
6
All EPs Only
20
18
48
1.621
78
0
0
1
1.20%
0.15%
3.25%
1
0
4

60
18
48
1.621
78
0
0
0
0.06%
0.00%
0.23%
0
0
0

100
18
48
1.621
78
0
0
0
0.01%
0.00%
0.03%
0
0
0

200
18
48
1.621
78
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
18
48
1.621
78
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
6
22
1.090
24
2
1
5
37.16%
16.67%
80.50%
11
6
23

2
6
22
1.090
24
1
1
2
20.62%
16.57%
40.31%
7
6
13

6
6
22
1.090
24
1
1
1
14.52%
9.30%
17.62%
5
3
6
EPs Only at Surface
Water Systems
10
6
22
1.090
24
1
0
1
10.05%
3.54%
15.98%
4
1
6
20
6
22
1.090
24
0
0
1
3.60%
0.44%
9.75%
1
0
4
60
6
22
1.090
24
0
0
0
0.18%
0.00%
0.68%
0
0
0

100
6
22
1.090
24
0
0
0
0.03%
0.00%
0.09%
0
0
0

200
6
22
1.090
24
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
6
22
1.090
24
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
9
25
2.040
50
1
0
3
8.77%
0.00%
33.61%
4
0
15

2
9
25
2.040
50
0
0
1
1.45%
0.00%
8.22%
1
0
4

6
9
25
2.040
50
0
0
0
0.12%
0.00%
0.49%
0
0
0
EPs Only at Ground
Water Systems
10
9
25
2.040
50
0
0
0
0.03%
0.00%
0.07%
0
0
0
20
9
25
2.040
50
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
9
25
2.040
50
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
9
25
2.040
50
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
9
25
2.040
50
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
9
25
2.040
50
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
3
1
3.000
3
0
0
2
12.26%
0.00%
50.39%
0
0
2

2
3
1
3.000
3
0
0
0
1.90%
0.00%
11.64%
0
0
0

6
3
1
3.000
3
0
0
0
0.13%
0.00%
0.40%
0
0
0
EPs Only at
10
3
1
3.000
3
0
0
0
0.03%
0.00%
0.04%
0
0
0
Mixed Water
20
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
1
3.000
3
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 95 of 114
December 2016

-------
C.6-0T Only
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
697,151
1,746,427
0.641
1,119,294
129,716
10,930
401,399
18.61%
1.57%
57.58%
297,126
137,773
679,060
697,151
1,746,427
0.641
1,119,294
31,869
10,832
119,994
4.57%
1.55%
17.21%
166,112
136,855
299,671
697,151
1,746,427
0.641
1,119,294
10,742
6,057
17,923
1.54%
0.87%
2.57%
119,833
76,519
145,786
697,151
1,746,427
0.641
1,119,294
6,810
2,302
11,285
0.98%
0.33%
1.62%
83,043
29,078
132,022
697,151
1,746,427
0.641
1,119,294
2,373
289
6,404
0.34%
0.04%
0.92%
29,783
3,653
80,541
697,151
1,746,427
0.641
1,119,294
121
2
446
0.02%
0.00%
0.06%
1,526
25
5,635
697,151
1,746,427
0.641
1,119,294
18
0
61
0.00%
0.00%
0.01%
232

775
697,151
1,746,427
0.641
1,119,294
1
0
2
0.00%
0.00%
0.00%
11
0
29
697,151
1,746,427
0.641
1,119,294
0
0
0
0.00%
0.00%
0.00%
0
0
0
429,390
876,128
0.717
628,618
102,587
10,928
283,767
23.89%
2.54%
66.09%
248,521
137,767
482,031
429,390
876,128
0.717
628,618
27,372
10,832
93,364
6.37%
2.52%
21.74%
157,962
136,855
250,521
429,390
876,128
0.717
628,618
10,382
6,057
16,717
2.42%
1.41%
3.89%
119,227
76,519
143,448
429,390
876,128
0.717
628,618
6,727
2,302
11,140
1.57%
0.54%
2.59%
82,917
29,078
131,733
429,390
876,128
0.717
628,618
2,366
289
6,399
0.55%
0.07%
1.49%
29,772
3,653
80,529
429,390
876,128
0.717
628,618
121
2
446
0.03%
0.00%
0.10%
1,526
25
5,635
429,390
876,128
0.717
628,618
18
0
61
0.00%
0.00%
0.01%
232

775
429,390
876,128
0.717
628,618
1
0
2
0.00%
0.00%
0.00%
11
0
29
429,390
876,128
0.717
628,618
0
0
0
0.00%
0.00%
0.00%
0
0
0
191,002
767,954
0.539
413,917
17,715
2
78,953
9.27%
0.00%
41.34%
39,191
7
158,351
191,002
767,954
0.539
413,917
3,040
0
17,692
1.59%
0.00%
9.26%
6,692
0
40,212
191,002
767,954
0.539
413,917
261
0
902
0.14%
0.00%
0.47%
508
0
2,033
191,002
767,954
0.539
413,917
62
0
112
0.03%
0.00%
0.06%
106
0
257
191,002
767,954
0.539
413,917
6
0
5
0.00%
0.00%
0.00%
9
0
11
191,002
767,954
0.539
413,917
0
0
0
0.00%
0.00%
0.00%
0
0
0
191,002
767,954
0.539
413,917
0
0
0
0.00%
0.00%
0.00%
0
0
0
191,002
767,954
0.539
413,917
0
0
0
0.00%
0.00%
0.00%
0
0
0
191,002
767,954
0.539
413,917
0
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
102,346
0.750
76,760
9,414
0
38,679
12.26%
0.00%
50.39%
9,414
0
38,679
76,760
102,346
0.750
76,760
1,457
0
8,938
1.90%
0.00%
11.64%
1,457
0
8,938
76,760
102,346
0.750
76,760
99
0
305
0.13%
0.00%
0.40%
99
0
305
76,760
102,346
0.750
76,760
21
0
33
0.03%
0.00%
0.04%
21
0
33
76,760
102,346
0.750
76,760
2
0
1
0.00%
0.00%
0.00%
2
0
1
76,760
102,346
0.750
76,760
0
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
102,346
0.750
76,760
0
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
102,346
0.750
76,760
0
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
102,346
0.750
76,760
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 96 of 114
December 2016

-------
C.6-0T Only
Source Water Type
Threshold
(ng/L)
Total
Number of
National
Number
MR Ratio
National
Number of
Number of
UCMR 2 MRs
Predicted to
have Any
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted
to have Any
Detects
Exceeding
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation

UCMR 2 MRs
Systems

MRs











Exceeding
Threshold
Lower Bound
Upper Bound
Threshold 
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
14
48
1.393
67
7
3
11
50.19%
24.84%
80.51%
31
15
49

2
14
48
1.393
67
3
2
6
23.56%
11.00%
43.50%
15
8
28

6
14
48
1.393
67
1
1
2
9.29%
7.11%
15.15%
7
6
11

10
14
48
1.393
67
1
1
1
7.02%
5.20%
8.81%
6
4
7
All MRs Only
20
14
48
1.393
67
1
0
1
4.10%
1.37%
6.73%
3
1
6

60
14
48
1.393
67
0
0
0
0.42%
0.02%
1.58%
0
0
1

100
14
48
1.393
67
0
0
0
0.07%
0.00%
0.33%
0
0
0

200
14
48
1.393
67
0
0
0
0.00%
0.00%
0.02%
0
0
0

600
14
48
1.393
67
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
6
22
1.090
24
4
2
6
70.46%
38.94%
96.59%
19
12
24

2
6
22
1.090
24
2
1
4
37.22%
20.54%
62.54%
12
7
19

6
6
22
1.090
24
1
1
2
19.09%
16.46%
26.49%
7
6
9
MRs Only at
10
6
22
1.090
24
1
1
1
15.81%
12.12%
18.35%
6
4
7
Surface Water
20
6
22
1.090
24
1
0
1
9.54%
3.20%
15.55%
3
1
6
Systems
60
6
22
1.090
24
0
0
0
0.98%
0.05%
3.68%
0
0
1

100
6
22
1.090
24
0
0
0
0.17%
0.00%
0.77%
0
0
0

200
6
22
1.090
24
0
0
0
0.01%
0.00%
0.04%
0
0
0

600
6
22
1.090
24
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
7
25
1.680
42
2
0
4
25.74%
2.28%
63.95%
11
1
24

2
7
25
1.680
42
0
0
1
4.61%
0.02%
19.35%
2
0
8

6
7
25
1.680
42
0
0
0
0.32%
0.00%
1.92%
0
0
1
MRs Only at
10
7
25
1.680
42
0
0
0
0.06%
0.00%
0.33%
0
0
0
Ground Water
20
7
25
1.680
42
0
0
0
0.00%
0.00%
0.01%
0
0
0
Systems
60
7
25
1.680
42
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
7
25
1.680
42
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
7
25
1.680
42
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
7
25
1.680
42
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
1
1.000
1
1
1
1
99.65%
98.16%
100.00%
1
1
1

2
1
1
1.000
1
1
0
1
74.24%
30.64%
98.38%
1
0
1

6
1
1
1.000
1
0
0
0
13.30%
0.75%
39.71%
0
0
0
MRs Only at
10
1
1
1.000
1
0
0
0
2.97%
0.06%
10.94%
0
0
0
Mixed Water
20
1
1
1.000
1
0
0
0
0.20%
0.00%
0.79%
0
0
0
Systems
60
1
1
1.000
1
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
1
1.000
1
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
1
1.000
1
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
1
1.000
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 97 of 114
December 2016

-------
C.6-0T Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI onPercent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
632,149
1,746,427
0.601
1,049,811
316,517
93,104
555,305
50.07%
14.73%
87.84%
572,111
282,638
894,506
632,149
1,746,427
0.601
1,049,811
94,683
20,686
253,081
14.98%
3.27%
40.04%
277,488
161,436
498,278
632,149
1,746,427
0.601
1,049,811
18,473
10,853
41,906
2.92%
1.72%
6.63%
152,587
134,875
199,829
632,149
1,746,427
0.601
1,049,811
11,446
7,749
16,931
1.81%
1.23%
2.68%
129,440
97,705
147,759
632,149
1,746,427
0.601
1,049,811
6,303
2,088
10,475
1.00%
0.33%
1.66%
78,761
26,379
128,774
632,149
1,746,427
0.601
1,049,811
643
32
2,406
0.10%
0.01%
0.38%
8,122
410
30,391
632,149
1,746,427
0.601
1,049,811
112
2
504
0.02%
0.00%
0.08%
1,414
27
6,372
632,149
1,746,427
0.601
1,049,811
5
0
27
0.00%
0.00%
0.00%
68
0
337
632,149
1,746,427
0.601
1,049,811
0
0
0
0.00%
0.00%
0.00%
0
0
1
429,390
876,128
0.717
628,618
244,675
66,265
403,871
56.98%
15.43%
94.06%
438,862
252,040
603,093
429,390
876,128
0.717
628,618
67,414
12,827
188,808
15.70%
2.99%
43.97%
238,435
153,531
383,612
429,390
876,128
0.717
628,618
14,497
10,662
28,550
3.38%
2.48%
6.65%
147,676
134,683
181,343
429,390
876,128
0.717
628,618
10,581
7,732
13,657
2.46%
1.80%
3.18%
128,389
97,688
143,672
429,390
876,128
0.717
628,618
6,246
2,088
10,253
1.45%
0.49%
2.39%
78,692
26,379
128,515
429,390
876,128
0.717
628,618
643
32
2,406
0.15%
0.01%
0.56%
8,122
410
30,390
429,390
876,128
0.717
628,618
112
2
504
0.03%
0.00%
0.12%
1,414
27
6,372
429,390
876,128
0.717
628,618
5
0
27
0.00%
0.00%
0.01%
68
0
337
429,390
876,128
0.717
628,618
0
0
0
0.00%
0.00%
0.00%
0
0
1
177,173
767,954
0.515
395,607
46,344
1,723
125,848
26.16%
0.97%
71.03%
107,751
5,483
265,826
177,173
767,954
0.515
395,607
8,272
21
39,102
4.67%
0.01%
22.07%
20,057
66
89,493
177,173
767,954
0.515
395,607
573
0
3,197
0.32%
0.00%
1.80%
1,509
0
8,326
177,173
767,954
0.515
395,607
106
0
476
0.06%
0.00%
0.27%
291
0
1,288
177,173
767,954
0.515
395,607
6
0
20
0.00%
0.00%
0.01%
19
0
57
177,173
767,954
0.515
395,607
0
0
0
0.00%
0.00%
0.00%
0
0
0
177,173
767,954
0.515
395,607
0
0
0
0.00%
0.00%
0.00%
0
0
0
177,173
767,954
0.515
395,607
0
0
0
0.00%
0.00%
0.00%
0
0
0
177,173
767,954
0.515
395,607
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
102,346
0.250
25,587
25,498
25,116
25,586
99.65%
98.16%
100.00%
25,498
25,116
25,586
25,587
102,346
0.250
25,587
18,996
7,839
25,172
74.24%
30.64%
98.38%
18,996
7,839
25,172
25,587
102,346
0.250
25,587
3,403
192
10,160
13.30%
0.75%
39.71%
3,403
192
10,160
25,587
102,346
0.250
25,587
760
16
2,798
2.97%
0.06%
10.94%
760
16
2,798
25,587
102,346
0.250
25,587
50
0
202
0.20%
0.00%
0.79%
50
0
202
25,587
102,346
0.250
25,587
0
0
1
0.00%
0.00%
0.00%
0
0
1
25,587
102,346
0.250
25,587
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
102,346
0.250
25,587
0
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
102,346
0.250
25,587
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 98 of 114
December 2016

-------
C.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation






Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)

0.6
80
8,222
1.488
12,235
7
3
13
8.79%
4.50%
14.51%
1,075
550
1,775

2
80
8,222
1.488
12,235
2
1
4
2.37%
0.98%
4.25%
290
120
520

6
80
8,222
1.488
12,235
0
0
1
0.36%
0.05%
0.97%
44
6
119

10
80
8,222
1.488
12,235
0
0
0
0.11%
0.01%
0.36%
13
1
44
All EPs Only
20
80
8,222
1.488
12,235
0
0
0
0.01%
0.00%
0.06%
2
0
7

60
80
8,222
1.488
12,235
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
80
8,222
1.488
12,235
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
80
8,222
1.488
12,235
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
80
8,222
1.488
12,235
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
4
36
1.000
36
1
0
2
20.71%
0.38%
55.08%
7
0
20

2
4
36
1.000
36
0
0
1
3.61%
0.00%
15.60%
1
0
6

6
4
36
1.000
36
0
0
0
0.20%
0.00%
0.98%
0
0
0
EPs Only at Surface
Water Systems
10
4
36
1.000
36
0
0
0
0.03%
0.00%
0.13%
0
0
0
20
4
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
4
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
4
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
4
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
4
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
76
8,187
1.490
12,200
7
3
11
8.75%
4.51%
14.39%
1,067
550
1,755

2
76
8,187
1.490
12,200
2
1
3
2.36%
0.98%
4.21%
288
120
514

6
76
8,187
1.490
12,200
0
0
1
0.36%
0.05%
0.97%
44
6
119
EPs Only at Ground
Water Systems
10
76
8,187
1.490
12,200
0
0
0
0.11%
0.01%
0.36%
13
1
44
20
76
8,187
1.490
12,200
0
0
0
0.01%
0.00%
0.06%
2
0
7
60
76
8,187
1.490
12,200
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
76
8,187
1.490
12,200
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
76
8,187
1.490
12,200
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
76
8,187
1.490
12,200
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
10
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 99 of 114
December 2016

-------
C.7 - ND Only
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
39,004
6,985,901
0.920
6,424,530
5,272
2,326
8,931
13.48%
5.99%
22.74%
866,138
384,740
1,460,652
39,004
6,985,901
0.920
6,424,530
1,508
455
3,193
3.87%
1.17%
8.14%
248,465
75,332
522,930
39,004
6,985,901
0.920
6,424,530
222
24
686
0.57%
0.06%
1.76%
36,732
4,013
113,264
39,004
6,985,901
0.920
6,424,530
63
4
224
0.16%
0.01%
0.58%
10,351
581
37,095
39,004
6,985,901
0.920
6,424,530
7
0
30
0.02%
0.00%
0.08%
1,185
20
4,968
39,004
6,985,901
0.920
6,424,530
0
0
0
0.00%
0.00%
0.00%
12
0
59
39,004
6,985,901
0.920
6,424,530
0
0
0
0.00%
0.00%
0.00%
1
0
4
39,004
6,985,901
0.920
6,424,530
0
0
0
0.00%
0.00%
0.00%
0
0
0
39,004
6,985,901
0.920
6,424,530
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
95
1
264
21.21%
0.31%
58.95%
9,611
139
26,716
448
90,645
0.500
45,323
17
0
85
3.86%
0.00%
18.91%
1,750
0
8,570
448
90,645
0.500
45,323
1
0
4
0.24%
0.00%
0.98%
108
0
442
448
90,645
0.500
45,323
0
0
1
0.04%
0.00%
0.13%
18
0
57
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
1
0
2
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
38,556
6,895,255
0.925
6,379,207
5,177
2,325
8,667
13.43%
6.03%
22.48%
856,527
384,601
1,433,936
38,556
6,895,255
0.925
6,379,207
1,491
455
3,109
3.87%
1.18%
8.06%
246,715
75,332
514,360
38,556
6,895,255
0.925
6,379,207
221
24
682
0.57%
0.06%
1.77%
36,624
4,013
112,822
38,556
6,895,255
0.925
6,379,207
62
4
224
0.16%
0.01%
0.58%
10,332
581
37,038
38,556
6,895,255
0.925
6,379,207
7
0
30
0.02%
0.00%
0.08%
1,184
20
4,965
38,556
6,895,255
0.925
6,379,207
0
0
0
0.00%
0.00%
0.00%
12
0
59
38,556
6,895,255
0.925
6,379,207
0
0
0
0.00%
0.00%
0.00%
1
0
4
38,556
6,895,255
0.925
6,379,207
0
0
0
0.00%
0.00%
0.00%
0
0
0
38,556
6,895,255
0.925
6,379,207
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 100 of 114
December 2016

-------
C.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted to
have Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound

SMALL SYSTEMS (Serving < 10,000)
All MRs Only
0.6
10
8,222
0.258
2,123
3
0
7
29.81%
2.57%
68.91%
633
54
1,463
2
10
8,222
0.258
2,123
1
0
2
4.39%
0.02%
15.04%
93
0
319
6
10
8,222
0.258
2,123
0
0
0
0.26%
0.00%
1.41%
5
0
30
10
10
8,222
0.258
2,123
0
0
0
0.04%
0.00%
0.23%
1
0
5
20
10
8,222
0.258
2,123
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
10
8,222
0.258
2,123
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
10
8,222
0.258
2,123
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
10
8,222
0.258
2,123
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
10
8,222
0.258
2,123
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
4
36
1.000
36
2
0
3
42.97%
7.19%
82.70%
15
3
30
2
4
36
1.000
36
0
0
1
8.71%
0.07%
27.86%
3
0
10
6
4
36
1.000
36
0
0
0
0.47%
0.00%
2.18%
0
0
1
10
4
36
1.000
36
0
0
0
0.07%
0.00%
0.30%
0
0
0
20
4
36
1.000
36
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
4
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
4
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
4
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
4
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Ground Water
Systems
0.6
6
8,187
0.255
2,087
2
0
4
29.58%
2.49%
68.67%
617
52
1,433
2
6
8,187
0.255
2,087
0
0
1
4.31%
0.02%
14.82%
90
0
309
6
6
8,187
0.255
2,087
0
0
0
0.25%
0.00%
1.40%
5
0
29
10
6
8,187
0.255
2,087
0
0
0
0.04%
0.00%
0.23%
1
0
5
20
6
8,187
0.255
2,087
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
6
8,187
0.255
2,087
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
6
8,187
0.255
2,087
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
6
8,187
0.255
2,087
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
6
8,187
0.255
2,087
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 101 of 114
December 2016

-------
C.7 - ND Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
3,567
6,985,901
0.080
561,371
576
48
1,460
14.81%
1.10%
38.70%
83,124
6,192
217,273
3,567
6,985,901
0.080
561,371
94
0
378
2.34%
0.01%
9.59%
13,113
49
53,854
3,567
6,985,901
0.080
561,371
5
0
25
0.13%
0.00%
0.63%
734
0
3,520
3,567
6,985,901
0.080
561,371
1
0
4
0.02%
0.00%
0.09%
116
0
522
3,567
6,985,901
0.080
561,371
0
0
0
0.00%
0.00%
0.00%
5
0
18
3,567
6,985,901
0.080
561,371
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,567
6,985,901
0.080
561,371
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,567
6,985,901
0.080
561,371
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,567
6,985,901
0.080
561,371
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
189
28
378
42.17%
6.33%
84.51%
19,112
2,870
38,302
448
90,645
0.500
45,323
38
0
136
8.54%
0.07%
30.42%
3,872
30
13,787
448
90,645
0.500
45,323
2
0
10
0.47%
0.00%
2.18%
215
0
988
448
90,645
0.500
45,323
0
0
1
0.07%
0.00%
0.32%
33
0
146
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.01%
1
0
5
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,119
6,895,255
0.075
516,048
387
20
1,082
12.40%
0.64%
34.68%
64,013
3,322
178,971
3,119
6,895,255
0.075
516,048
56
0
242
1.79%
0.00%
7.76%
9,242
19
40,068
3,119
6,895,255
0.075
516,048
3
0
15
0.10%
0.00%
0.49%
519
0
2,532
3,119
6,895,255
0.075
516,048
1
0
2
0.02%
0.00%
0.07%
83
0
377
3,119
6,895,255
0.075
516,048
0
0
0
0.00%
0.00%
0.00%
4
0
13
3,119
6,895,255
0.075
516,048
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,119
6,895,255
0.075
516,048
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,119
6,895,255
0.075
516,048
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,119
6,895,255
0.075
516,048
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 102 of 114
December 2016

-------
C.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation






Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound

LARGE SYSTEMS (Serving 10,001  100,000)

0.6
51
24
15.333
363
8
5
12
16.00%
10.14%
23.19%
58
37
84

2
51
24
15.333
363
2
1
4
4.70%
1.95%
8.04%
17
7
29

6
51
24
15.333
363
0
0
1
0.61%
0.09%
1.61%
2
0
6

10
51
24
15.333
363
0
0
0
0.16%
0.01%
0.54%
1
0
2
All EPs Only
20
51
24
15.333
363
0
0
0
0.02%
0.00%
0.07%
0
0
0

60
51
24
15.333
363
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
51
24
15.333
363
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
51
24
15.333
363
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
51
24
15.333
363
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
10
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
46
24
15.333
363
7
5
11
16.00%
10.14%
23.19%
58
37
84

2
46
24
15.333
363
2
1
4
4.70%
1.95%
8.04%
17
7
29

6
46
24
15.333
363
0
0
1
0.61%
0.09%
1.61%
2
0
6
EPs Only at Ground
Water Systems
10
46
24
15.333
363
0
0
0
0.16%
0.01%
0.54%
1
0
2
20
46
24
15.333
363
0
0
0
0.02%
0.00%
0.07%
0
0
0
60
46
24
15.333
363
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
46
24
15.333
363
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
46
24
15.333
363
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
46
24
15.333
363
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
5
0
0.000
0
0
0
1
5.01%
0.00%
24.28%
0
0
0

2
5
0
0.000
0
0
0
0
0.61%
0.00%
3.41%
0
0
0

6
5
0
0.000
0
0
0
0
0.03%
0.00%
0.09%
0
0
0
EPs Only at
10
5
0
0.000
0
0
0
0
0.01%
0.00%
0.01%
0
0
0
Mixed Water
20
5
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
5
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
5
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
5
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
5
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 103 of 114
December 2016

-------
C.7 - ND Only
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
312,408
613,666
1.371
841,565
38,595
21,175
72,329
15.00%
9.21%
22.96%
126,213
77,470
193,195
312,408
613,666
1.371
841,565
10,658
4,195
20,590
4.41%
1.82%
7.70%
37,153
15,350
64,818
312,408
613,666
1.371
841,565
1,337
184
3,536
0.57%
0.08%
1.50%
4,797
672
12,638
312,408
613,666
1.371
841,565
351
23
1,151
0.15%
0.01%
0.50%
1,270
83
4,182
312,408
613,666
1.371
841,565
38
1
148
0.02%
0.00%
0.06%
137
3
541
312,408
613,666
1.371
841,565
0
0
2
0.00%
0.00%
0.00%
1
0
6
312,408
613,666
1.371
841,565
0
0
0
0.00%
0.00%
0.00%
0
0
0
312,408
613,666
1.371
841,565
0
0
0
0.00%
0.00%
0.00%
0
0
0
312,408
613,666
1.371
841,565
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
230,022
613,666
1.371
841,565
34,497
21,175
52,805
15.00%
9.21%
22.96%
126,213
77,470
193,195
230,022
613,666
1.371
841,565
10,155
4,195
17,716
4.41%
1.82%
7.70%
37,153
15,350
64,818
230,022
613,666
1.371
841,565
1,311
184
3,454
0.57%
0.08%
1.50%
4,797
672
12,638
230,022
613,666
1.371
841,565
347
23
1,143
0.15%
0.01%
0.50%
1,270
83
4,182
230,022
613,666
1.371
841,565
37
1
148
0.02%
0.00%
0.06%
137
3
541
230,022
613,666
1.371
841,565
0
0
2
0.00%
0.00%
0.00%
1
0
6
230,022
613,666
1.371
841,565
0
0
0
0.00%
0.00%
0.00%
0
0
0
230,022
613,666
1.371
841,565
0
0
0
0.00%
0.00%
0.00%
0
0
0
230,022
613,666
1.371
841,565
0
0
0
0.00%
0.00%
0.00%
0
0
0
82,386
0
0.000
0
4,097
0
19,524
4.97%
0.00%
23.70%
0
0
0
82,386
0
0.000
0
503
0
2,874
0.61%
0.00%
3.49%
0
0
0
82,386
0
0.000
0
26
0
82
0.03%
0.00%
0.10%
0
0
0
82,386
0
0.000
0
4
0
8
0.01%
0.00%
0.01%
0
0
0
82,386
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
82,386
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
82,386
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
82,386
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
82,386
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 104 of 114
December 2016

-------
C.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted to
have Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound

LARGE SYSTEMS (Serving 10,001  100,000)
All MRs Only
0.6
6
24
0.333
8
0
0
1
2.43%
0.00%
14.85%
0
0
1
2
6
24
0.333
8
0
0
0
0.30%
0.00%
1.86%
0
0
0
6
6
24
0.333
8
0
0
0
0.02%
0.00%
0.03%
0
0
0
10
6
24
0.333
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
6
24
0.333
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
6
24
0.333
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
6
24
0.333
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
6
24
0.333
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
6
24
0.333
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Ground Water
Systems
0.6
4
24
0.333
8
0
0
1
2.43%
0.00%
14.85%
0
0
1
2
4
24
0.333
8
0
0
0
0.30%
0.00%
1.86%
0
0
0
6
4
24
0.333
8
0
0
0
0.02%
0.00%
0.03%
0
0
0
10
4
24
0.333
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
4
24
0.333
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
4
24
0.333
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
4
24
0.333
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
4
24
0.333
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
4
24
0.333
8
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 105 of 114
December 2016

-------
C.7 - ND Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001  100,000)
2,750
613,666
0.016
10,061
267
0
1,634
9.71%
0.00%
59.40%
977
0
5,977
2,750
613,666
0.016
10,061
33
0
204
1.21%
0.00%
7.42%
122
0
747
2,750
613,666
0.016
10,061
2
0
4
0.08%
0.00%
0.14%
8
0
14
2,750
613,666
0.016
10,061
0
0
0
0.02%
0.00%
0.01%
2
0
1
2,750
613,666
0.016
10,061
0
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
613,666
0.016
10,061
0
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
613,666
0.016
10,061
0
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
613,666
0.016
10,061
0
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
613,666
0.016
10,061
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
613,666
0.016
10,061
267
0
1,634
9.71%
0.00%
59.40%
977
0
5,977
2,750
613,666
0.016
10,061
33
0
204
1.21%
0.00%
7.42%
122
0
747
2,750
613,666
0.016
10,061
2
0
4
0.08%
0.00%
0.14%
8
0
14
2,750
613,666
0.016
10,061
0
0
0
0.02%
0.00%
0.01%
2
0
1
2,750
613,666
0.016
10,061
0
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
613,666
0.016
10,061
0
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
613,666
0.016
10,061
0
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
613,666
0.016
10,061
0
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
613,666
0.016
10,061
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 106 of 114
December 2016

-------
C.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All EPs Only
0.6
82
1
9.000
9
11
5
19
12.20%
4.24%
24.17%
1
0
2
2
82
1
9.000
9
2
0
4
2.53%
0.16%
7.88%
0
0
1
6
82
1
9.000
9
0
0
0
0.19%
0.00%
0.91%
0
0
0
10
82
1
9.000
9
0
0
0
0.04%
0.00%
0.18%
0
0
0
20
82
1
9.000
9
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
82
1
9.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
82
1
9.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
82
1
9.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
82
1
9.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
9
1
9.000
9
1
0
2
12.20%
4.24%
24.17%
1
0
2
2
9
1
9.000
9
0
0
1
2.53%
0.16%
7.88%
0
0
1
6
9
1
9.000
9
0
0
0
0.19%
0.00%
0.91%
0
0
0
10
9
1
9.000
9
0
0
0
0.04%
0.00%
0.18%
0
0
0
20
9
1
9.000
9
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
9
1
9.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
9
1
9.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
9
1
9.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
9
1
9.000
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
73
0
0.000
0
10
5
16
13.99%
6.35%
22.48%
0
0
0
2
73
0
0.000
0
2
0
3
2.17%
0.62%
4.44%
0
0
0
6
73
0
0.000
0
0
0
0
0.15%
0.01%
0.48%
0
0
0
10
73
0
0.000
0
0
0
0
0.03%
0.00%
0.12%
0
0
0
20
73
0
0.000
0
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
73
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
73
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
73
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
73
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 107 of 114
December 2016

-------
C.7 - ND Only
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
614,607
107,323
2.030
217,841
39,637
14,288
87,762
3.63%
0.43%
15.02%
7,908
932
32,720
614,607
107,323
2.030
217,841
5,659
1,296
13,888
0.48%
0.02%
1.77%
1,052
34
3,858
614,607
107,323
2.030
217,841
374
27
1,279
0.03%
0.00%
0.13%
59
0
283
614,607
107,323
2.030
217,841
74
2
310
0.00%
0.00%
0.02%
10
0
48
614,607
107,323
2.030
217,841
5
0
24
0.00%
0.00%
0.00%
1
0
3
614,607
107,323
2.030
217,841
0
0
0
0.00%
0.00%
0.00%
0
0
0
614,607
107,323
2.030
217,841
0
0
0
0.00%
0.00%
0.00%
0
0
0
614,607
107,323
2.030
217,841
0
0
0
0.00%
0.00%
0.00%
0
0
0
614,607
107,323
2.030
217,841
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
217,841
107,323
2.030
217,841
7,908
932
32,720
3.63%
0.43%
15.02%
7,908
932
32,720
217,841
107,323
2.030
217,841
1,052
34
3,858
0.48%
0.02%
1.77%
1,052
34
3,858
217,841
107,323
2.030
217,841
59
0
283
0.03%
0.00%
0.13%
59
0
283
217,841
107,323
2.030
217,841
10
0
48
0.00%
0.00%
0.02%
10
0
48
217,841
107,323
2.030
217,841
1
0
3
0.00%
0.00%
0.00%
1
0
3
217,841
107,323
2.030
217,841
0
0
0
0.00%
0.00%
0.00%
0
0
0
217,841
107,323
2.030
217,841
0
0
0
0.00%
0.00%
0.00%
0
0
0
217,841
107,323
2.030
217,841
0
0
0
0.00%
0.00%
0.00%
0
0
0
217,841
107,323
2.030
217,841
0
0
0
0.00%
0.00%
0.00%
0
0
0
396,766
0
0.000
0
31,729
13,356
55,042
8.00%
3.37%
13.87%
0
0
0
396,766
0
0.000
0
4,607
1,262
10,030
1.16%
0.32%
2.53%
0
0
0
396,766
0
0.000
0
314
27
996
0.08%
0.01%
0.25%
0
0
0
396,766
0
0.000
0
63
2
262
0.02%
0.00%
0.07%
0
0
0
396,766
0
0.000
0
5
0
21
0.00%
0.00%
0.01%
0
0
0
396,766
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
396,766
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
396,766
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
396,766
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 108 of 114
December 2016

-------
C.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted to
have Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All MRs Only
0.6
9
1
0.000
0
2
1
3
0.00%
0.00%
0.00%
0
0
0
2
9
1
0.000
0
1
0
2
0.00%
0.00%
0.00%
0
0
0
6
9
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
9
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
9
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
9
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
9
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
9
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
9
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Ground Water
Systems
0.6
0
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
1
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
9
0
0.000
0
2
1
3
22.29%
16.62%
30.25%
0
0
0
2
9
0
0.000
0
1
0
2
9.80%
2.83%
17.12%
0
0
0
6
9
0
0.000
0
0
0
0
1.34%
0.05%
4.43%
0
0
0
10
9
0
0.000
0
0
0
0
0.33%
0.00%
1.31%
0
0
0
20
9
0
0.000
0
0
0
0
0.03%
0.00%
0.12%
0
0
0
60
9
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
9
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
9
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
9
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 109 of 114
December 2016

-------
C.7 - ND Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
8,943
107,323
0.000
0
5,635
4,114
8,059
0.00%
0.00%
0.00%
0
0
0
8,943
107,323
0.000
0
2,440
700
4,280
0.00%
0.00%
0.00%
0
0
0
8,943
107,323
0.000
0
332
12
1,095
0.00%
0.00%
0.00%
0
0
0
8,943
107,323
0.000
0
82
1
324
0.00%
0.00%
0.00%
0
0
0
8,943
107,323
0.000
0
8
0
31
0.00%
0.00%
0.00%
0
0
0
8,943
107,323
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
107,323
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
107,323
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
107,323
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
107,323
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
107,323
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
107,323
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
107,323
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
107,323
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
107,323
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
107,323
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
107,323
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
107,323
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0.000
0
5,635
4,114
8,059
63.01%
46.00%
90.12%
0
0
0
8,943
0
0.000
0
2,440
700
4,280
27.29%
7.82%
47.86%
0
0
0
8,943
0
0.000
0
332
12
1,095
3.72%
0.14%
12.25%
0
0
0
8,943
0
0.000
0
82
1
324
0.92%
0.01%
3.62%
0
0
0
8,943
0
0.000
0
8
0
31
0.09%
0.00%
0.34%
0
0
0
8,943
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 110 of 114
December 2016

-------
C.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs
National
Number
Systems
EP Ratio
National
Number of
EPS
Number of
UCMR 2 EPs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2 EPs
Predicted to have Any Detects
Exceeding Threshold
Percentage of
EPs Predicted
to have Any
Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of EPs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of EPs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of EPs with
Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All EPs Only
0.6
213
8,247
1.529
12,608
26
13
44
12.39%
6.16%
20.47%
1,134
588
1,861
2
213
8,247
1.529
12,608
6
2
12
2.79%
0.99%
5.47%
307
127
550
6
213
8,247
1.529
12,608
1
0
2
0.33%
0.04%
0.92%
46
7
125
10
213
8,247
1.529
12,608
0
0
1
0.09%
0.01%
0.30%
13
1
46
20
213
8,247
1.529
12,608
0
0
0
0.01%
0.00%
0.04%
2
0
7
60
213
8,247
1.529
12,608
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
213
8,247
1.529
12,608
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
213
8,247
1.529
12,608
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
213
8,247
1.529
12,608
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
4
36
1.000
36
1
0
2
20.71%
0.38%
55.08%
7
0
20
2
4
36
1.000
36
0
0
1
3.61%
0.00%
15.60%
1
0
6
6
4
36
1.000
36
0
0
0
0.20%
0.00%
0.98%
0
0
0
10
4
36
1.000
36
0
0
0
0.03%
0.00%
0.13%
0
0
0
20
4
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
4
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
4
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
4
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
4
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
131
8,211
1.531
12,572
15
8
24
11.53%
6.47%
18.15%
1,127
587
1,842
2
131
8,211
1.531
12,572
4
2
8
3.20%
1.27%
5.81%
306
127
544
6
131
8,211
1.531
12,572
1
0
2
0.44%
0.06%
1.19%
46
7
125
10
131
8,211
1.531
12,572
0
0
1
0.12%
0.01%
0.41%
13
1
46
20
131
8,211
1.531
12,572
0
0
0
0.01%
0.00%
0.06%
2
0
7
60
131
8,211
1.531
12,572
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
131
8,211
1.531
12,572
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
131
8,211
1.531
12,572
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
131
8,211
1.531
12,572
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
78
0
0.000
0
10
5
18
13.41%
5.95%
22.60%
0
0
0
2
78
0
0.000
0
2
0
3
2.07%
0.58%
4.37%
0
0
0
6
78
0
0.000
0
0
0
0
0.15%
0.01%
0.45%
0
0
0
10
78
0
0.000
0
0
0
0
0.03%
0.00%
0.12%
0
0
0
20
78
0
0.000
0
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
78
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
78
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
78
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
78
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 111 of 114
December 2016

-------
C.7 - ND Only
Total Population
Served by UCMR
2 EPs
National Pop.
Served
EP Ratio
National
Population
Served by Eps
Population
Served by UCMR 2
EPs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 EPs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by EPs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by EPs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by EPs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by EPs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
966,018
7,706,889
0.971
7,483,937
83,503
37,789
169,021
8.64%
3.91%
17.50%
1,000,259
463,142
1,686,567
966,018
7,706,889
0.971
7,483,937
17,825
5,946
37,671
1.85%
0.62%
3.90%
286,670
90,716
591,606
966,018
7,706,889
0.971
7,483,937
1,933
235
5,502
0.20%
0.02%
0.57%
41,588
4,686
126,185
966,018
7,706,889
0.971
7,483,937
488
29
1,685
0.05%
0.00%
0.17%
11,631
664
41,324
966,018
7,706,889
0.971
7,483,937
50
1
202
0.01%
0.00%
0.02%
1,323
23
5,511
966,018
7,706,889
0.971
7,483,937
0
0
2
0.00%
0.00%
0.00%
14
0
65
966,018
7,706,889
0.971
7,483,937
0
0
0
0.00%
0.00%
0.00%
1
0
4
966,018
7,706,889
0.971
7,483,937
0
0
0
0.00%
0.00%
0.00%
0
0
0
966,018
7,706,889
0.971
7,483,937
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
95
1
264
21.21%
0.31%
58.95%
9,611
139
26,716
448
90,645
0.500
45,323
17
0
85
3.86%
0.00%
18.91%
1,750
0
8,570
448
90,645
0.500
45,323
1
0
4
0.24%
0.00%
0.98%
108
0
442
448
90,645
0.500
45,323
0
0
1
0.04%
0.00%
0.13%
18
0
57
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
1
0
2
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
486,419
7,616,244
0.977
7,438,614
47,582
24,431
94,192
9.78%
5.02%
19.36%
990,648
463,003
1,659,851
486,419
7,616,244
0.977
7,438,614
12,698
4,685
24,683
2.61%
0.96%
5.07%
284,920
90,715
583,036
486,419
7,616,244
0.977
7,438,614
1,592
208
4,420
0.33%
0.04%
0.91%
41,481
4,686
125,743
486,419
7,616,244
0.977
7,438,614
420
26
1,414
0.09%
0.01%
0.29%
11,612
664
41,267
486,419
7,616,244
0.977
7,438,614
45
1
180
0.01%
0.00%
0.04%
1,322
23
5,509
486,419
7,616,244
0.977
7,438,614
0
0
2
0.00%
0.00%
0.00%
14
0
65
486,419
7,616,244
0.977
7,438,614
0
0
0
0.00%
0.00%
0.00%
1
0
4
486,419
7,616,244
0.977
7,438,614
0
0
0
0.00%
0.00%
0.00%
0
0
0
486,419
7,616,244
0.977
7,438,614
0
0
0
0.00%
0.00%
0.00%
0
0
0
479,151
0
0.000
0
35,826
13,356
74,566
7.48%
2.79%
15.56%
0
0
0
479,151
0
0.000
0
5,110
1,262
12,904
1.07%
0.26%
2.69%
0
0
0
479,151
0
0.000
0
340
27
1,078
0.07%
0.01%
0.23%
0
0
0
479,151
0
0.000
0
68
2
270
0.01%
0.00%
0.06%
0
0
0
479,151
0
0.000
0
5
0
21
0.00%
0.00%
0.00%
0
0
0
479,151
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
479,151
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
479,151
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
479,151
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 112 of 114
December 2016

-------
C.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 MRs
National
Number
Systems
MR Ratio
National
Number of
MRs
Number of
UCMR 2 MRs
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
MRs Predicted to have Any
Detects Exceeding Threshold
Percentage of
MRs Predicted to
have Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Percentage of MRs
Predicted to have Any Detects
Exceeding Threshold -
National Extrapolation
Total Number
of MRs with
Any Detects
Exceeding
Threshold 
National
Extrapolation
90% CI on Number of MRs
with Any Detects Exceeding
Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All MRs Only
0.6
25
8,247
0.258
2,130
6
2
11
22.39%
7.73%
42.98%
633
54
1,464
2
25
8,247
0.258
2,130
2
0
4
6.01%
1.03%
14.48%
93
0
319
6
25
8,247
0.258
2,130
0
0
1
0.62%
0.02%
2.28%
5
0
30
10
25
8,247
0.258
2,130
0
0
0
0.14%
0.00%
0.58%
1
0
5
20
25
8,247
0.258
2,130
0
0
0
0.01%
0.00%
0.05%
0
0
0
60
25
8,247
0.258
2,130
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
25
8,247
0.258
2,130
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
25
8,247
0.258
2,130
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
25
8,247
0.258
2,130
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
5
36
1.000
36
2
0
3
34.38%
5.75%
66.16%
15
3
30
2
5
36
1.000
36
0
0
1
6.96%
0.06%
22.29%
3
0
10
6
5
36
1.000
36
0
0
0
0.37%
0.00%
1.75%
0
0
1
10
5
36
1.000
36
0
0
0
0.06%
0.00%
0.24%
0
0
0
20
5
36
1.000
36
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
5
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
5
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
5
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
5
36
1.000
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Ground Water
Systems
0.6
10
8,211
0.255
2,095
2
0
5
18.72%
1.49%
47.14%
618
52
1,434
2
10
8,211
0.255
2,095
0
0
1
2.71%
0.01%
9.64%
90
0
309
6
10
8,211
0.255
2,095
0
0
0
0.16%
0.00%
0.85%
5
0
29
10
10
8,211
0.255
2,095
0
0
0
0.03%
0.00%
0.14%
1
0
5
20
10
8,211
0.255
2,095
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
10
8,211
0.255
2,095
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
10
8,211
0.255
2,095
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
10
8,211
0.255
2,095
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
10
8,211
0.255
2,095
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
10
0
0.000
0
2
1
3
20.06%
14.95%
27.22%
0
0
0
2
10
0
0.000
0
1
0
2
8.82%
2.55%
15.41%
0
0
0
6
10
0
0.000
0
0
0
0
1.21%
0.05%
3.98%
0
0
0
10
10
0
0.000
0
0
0
0
0.30%
0.00%
1.18%
0
0
0
20
10
0
0.000
0
0
0
0
0.03%
0.00%
0.11%
0
0
0
60
10
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
10
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
10
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
10
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 113 of 114
December 2016

-------
C.7 - ND Only
Total Population
Served by UCMR
2 MRs
National Pop.
Served
MR Ratio
National
Population
Served by MRs
Population
Served by UCMR 2
MRs Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 MRs Predicted to have Any
Detects Exceeding Threshold
Percent of
Population Served
by MRs Predicted to
have Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Population Served
by MRs Predicted to have Any Detects
Exceeding Threshold - National
Extrapolation
Total Population
Served by MRs with
Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by MRs with
Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
15,259
7,706,889
0.074
571,432
6,477
4,162
11,152
42.45%
27.28%
73.09%
84,101
6,192
223,250
15,259
7,706,889
0.074
571,432
2,567
700
4,862
16.83%
4.59%
31.86%
13,235
49
54,601
15,259
7,706,889
0.074
571,432
340
12
1,124
2.23%
0.08%
7.37%
742
0
3,534
15,259
7,706,889
0.074
571,432
84
1
328
0.55%
0.01%
2.15%
118
0
523
15,259
7,706,889
0.074
571,432
8
0
31
0.05%
0.00%
0.20%
5
0
18
15,259
7,706,889
0.074
571,432
0
0
0
0.00%
0.00%
0.00%
0
0
0
15,259
7,706,889
0.074
571,432
0
0
0
0.00%
0.00%
0.00%
0
0
0
15,259
7,706,889
0.074
571,432
0
0
0
0.00%
0.00%
0.00%
0
0
0
15,259
7,706,889
0.074
571,432
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
189
28
378
42.17%
6.33%
84.51%
19,112
2,870
38,302
448
90,645
0.500
45,323
38
0
136
8.54%
0.07%
30.42%
3,872
30
13,787
448
90,645
0.500
45,323
2
0
10
0.47%
0.00%
2.18%
215
0
988
448
90,645
0.500
45,323
0
0
1
0.07%
0.00%
0.32%
33
0
146
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.01%
1
0
5
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
448
90,645
0.500
45,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,869
7,616,244
0.069
526,109
654
20
2,715
11.14%
0.34%
46.27%
64,989
3,322
184,948
5,869
7,616,244
0.069
526,109
89
0
446
1.52%
0.00%
7.60%
9,363
19
40,814
5,869
7,616,244
0.069
526,109
5
0
19
0.09%
0.00%
0.32%
527
0
2,546
5,869
7,616,244
0.069
526,109
1
0
3
0.02%
0.00%
0.04%
85
0
378
5,869
7,616,244
0.069
526,109
0
0
0
0.00%
0.00%
0.00%
4
0
13
5,869
7,616,244
0.069
526,109
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,869
7,616,244
0.069
526,109
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,869
7,616,244
0.069
526,109
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,869
7,616,244
0.069
526,109
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0.000
0
5,635
4,114
8,059
63.01%
46.00%
90.12%
0
0
0
8,943
0
0.000
0
2,440
700
4,280
27.29%
7.82%
47.86%
0
0
0
8,943
0
0.000
0
332
12
1,095
3.72%
0.14%
12.25%
0
0
0
8,943
0
0.000
0
82
1
324
0.92%
0.01%
3.62%
0
0
0
8,943
0
0.000
0
8
0
31
0.09%
0.00%
0.34%
0
0
0
8,943
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0.000
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix C
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 114 of 114
December 2016

-------
Appendix D
National Extrapolation of Systems
and Population Served Predicted
To Have Detections Exceeding
Thresholds
Appendix D
Six-Year Review 3
Technical Support Document for Nitrosamines Page 1 of 58
December 2016

-------
The UCMR 2 data set for nitrosamines includes data for 1,198 systems, 4,666
entry point locations and 2,397 maximum residence time locations. A model was
used to generate estimates of NDMA occurrence. The purpose of the model was
to estimate the mean concentration of NDMA in the drinking water of each water
system in UCMR, heterogeneity across systems in their means, variability around
those means and uncertainty in those estimates. To produce the results in this
appendix, the statistical model was used to simulate the probability of a detection
being greater than the HRL, and other thresholds, at each facility given that
facility's parameter values of mean and variability. Appendix D provides a national
extrapolation of system level counts, which are broken down by source water type.
Tables are first presented for all disinfectants, and then for chlorine (CL Only),
chloramines (CA Only), chloramines with other types of disinfectants (CA with CL-
OT), chlorine with other types of disinfectants (CL with OT), other types of
disinfectants (OT Only) and no disinfectant (ND Only).
Appendix D
Six-Year Review 3
Technical Support Document for Nitrosamines Page 2 of 58
December 2016

-------
D.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number
of Systems
with Any
Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
480
41,962
223
190
255
26.95%
20.08%
34.24%
11,309
8,426
14,366
2
480
41,962
96
82
113
8.75%
6.40%
11.46%
3,673
2,687
4,811
6
480
41,962
41
35
47
3.04%
2.29%
4.04%
1,276
959
1,696
10
480
41,962
28
24
33
1.95%
1.53%
2.61%
817
640
1,094
20
480
41,962
16
14
19
1.05%
0.85%
1.34%
442
357
561
60
480
41,962
6
5
8
0.35%
0.28%
0.43%
148
118
180
100
480
41,962
4
2
5
0.24%
0.15%
0.30%
99
65
125
200
480
41,962
1
0
2
0.11%
0.03%
0.20%
45
13
82
600
480
41,962
0
0
0
0.01%
0.00%
0.03%
3
0
11
Surface Water
Systems
0.6
222
1,986
153
138
166
68.72%
62.17%
74.67%
1,365
1,235
1,483
2
222
1,986
71
64
80
32.02%
28.60%
36.05%
636
568
716
6
222
1,986
30
27
34
13.57%
12.22%
15.09%
270
243
300
10
222
1,986
21
18
23
9.29%
8.20%
10.47%
185
163
208
20
222
1,986
12
10
14
5.48%
4.64%
6.36%
109
92
126
60
222
1,986
5
4
6
2.22%
1.64%
2.78%
44
33
55
100
222
1,986
3
1
4
1.15%
0.66%
1.68%
23
13
33
200
222
1,986
1
0
1
0.31%
0.09%
0.63%
6
2
13
600
222
1,986
0
0
0
0.01%
0.00%
0.03%
0
0
1
Ground Water
Systems
0.6
240
38,525
54
37
71
22.32%
15.57%
29.72%
8,600
5,999
11,448
2
240
38,525
12
8
18
5.18%
3.20%
7.54%
1,996
1,231
2,904
6
240
38,525
2
1
4
0.79%
0.27%
1.53%
306
105
591
10
240
38,525
1
0
2
0.26%
0.05%
0.67%
98
18
259
20
240
38,525
0
0
0
0.04%
0.00%
0.14%
15
1
55
60
240
38,525
0
0
0
0.00%
0.00%
0.00%
0
0
1
100
240
38,525
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
240
38,525
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
240
38,525
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
18
1,451
17
15
18
92.62%
82.20%
98.88%
1,344
1,193
1,435
2
18
1,451
13
11
15
71.78%
61.17%
82.08%
1,042
888
1,191
6
18
1,451
9
8
10
48.30%
42.12%
55.47%
701
611
805
10
18
1,451
7
6
8
36.78%
31.64%
43.23%
534
459
627
20
18
1,451
4
3
5
21.99%
18.22%
26.15%
319
264
379
60
18
1,451
1
1
2
7.11%
5.91%
8.53%
103
86
124
100
18
1,451
1
1
1
5.26%
3.57%
6.29%
76
52
91
200
18
1,451
0
0
1
2.66%
0.76%
4.80%
39
11
70
600
18
1,451
0
0
0
0.20%
0.01%
0.74%
3
0
11
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 3 of 58
December 2016

-------
D.l - All Disinfection Types
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
1,208,921
41,154,840
638,917
538,756
734,210
38.13%
29.20%
47.30%
15,690,723
12,017,905
19,464,953
1,208,921
41,154,840
315,714
263,980
375,698
16.35%
11.50%
21.53%
6,728,174
4,731,066
8,860,238
1,208,921
41,154,840
159,356
136,502
187,729
6.82%
5.15%
9.43%
2,808,022
2,121,357
3,881,905
1,208,921
41,154,840
113,937
93,967
137,385
4.38%
3.28%
6.01%
1,803,080
1,349,134
2,474,145
1,208,921
41,154,840
65,820
52,682
81,921
2.17%
1.62%
2.94%
893,803
665,042
1,209,259
1,208,921
41,154,840
24,673
18,147
31,839
0.62%
0.47%
0.81%
256,618
195,478
334,585
1,208,921
41,154,840
13,862
8,966
19,291
0.39%
0.26%
0.50%
159,753
105,574
207,459
1,208,921
41,154,840
4,814
1,450
8,973
0.17%
0.05%
0.30%
67,967
19,810
124,151
1,208,921
41,154,840
242
13
843
0.01%
0.00%
0.04%
4,440
202
16,075
573,691
5,030,810
410,165
368,802
448,687
68.78%
60.94%
76.05%
3,460,086
3,065,587
3,825,871
573,691
5,030,810
214,996
191,572
242,768
31.89%
27.80%
36.82%
1,604,386
1,398,441
1,852,583
573,691
5,030,810
112,716
101,022
125,302
14.28%
12.66%
16.13%
718,560
636,714
811,641
573,691
5,030,810
83,537
71,403
95,782
10.15%
8.55%
11.77%
510,625
430,225
592,232
573,691
5,030,810
51,027
41,815
61,673
5.98%
4.83%
7.32%
300,843
242,784
368,009
573,691
5,030,810
20,522
14,709
26,699
2.31%
1.66%
3.04%
116,335
83,627
152,853
573,691
5,030,810
10,794
6,880
15,647
1.23%
0.79%
1.76%
61,675
39,651
88,759
573,691
5,030,810
3,257
1,006
6,170
0.38%
0.12%
0.71%
18,935
5,857
35,812
573,691
5,030,810
124
8
407
0.01%
0.00%
0.05%
727
48
2,388
548,364
32,448,261
146,086
95,907
199,093
26.98%
17.99%
36.94%
8,753,143
5,836,875
11,985,224
548,364
32,448,261
34,509
17,455
55,825
7.30%
3.22%
11.71%
2,368,740
1,046,125
3,798,144
548,364
32,448,261
5,213
1,327
12,122
1.13%
0.21%
3.02%
366,982
69,498
980,378
548,364
32,448,261
1,669
229
5,169
0.34%
0.04%
1.15%
111,340
11,770
372,648
548,364
32,448,261
246
10
1,010
0.05%
0.00%
0.20%
14,933
518
63,849
548,364
32,448,261
4
0
18
0.00%
0.00%
0.00%
217
1
982
548,364
32,448,261
0
0
2
0.00%
0.00%
0.00%
19
0
82
548,364
32,448,261
0
0
0
0.00%
0.00%
0.00%
0
0
1
548,364
32,448,261
0
0
0
0.00%
0.00%
0.00%
0
0
0
86,866
3,675,769
82,666
74,046
86,429
94.61%
84.76%
99.40%
3,477,494
3,115,443
3,653,858
86,866
3,675,769
66,209
54,952
77,105
74.95%
62.20%
87.32%
2,755,048
2,286,501
3,209,511
86,866
3,675,769
41,428
34,153
50,305
46.86%
38.50%
56.86%
1,722,481
1,415,145
2,089,886
86,866
3,675,769
28,730
22,334
36,433
32.13%
24.68%
41.06%
1,181,115
907,139
1,509,266
86,866
3,675,769
14,547
10,856
19,238
15.73%
11.47%
21.15%
578,027
421,740
777,401
86,866
3,675,769
4,146
3,438
5,122
3.81%
3.04%
4.92%
140,066
111,851
180,750
86,866
3,675,769
3,068
2,085
3,643
2.67%
1.79%
3.23%
98,060
65,923
118,618
86,866
3,675,769
1,558
444
2,802
1.33%
0.38%
2.40%
49,031
13,953
88,338
86,866
3,675,769
118
5
436
0.10%
0.00%
0.37%
3,714
154
13,687
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 4 of 58
December 2016

-------
D.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number
of Systems
with Any
Detects
Exceeding
Threshold -
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation



Threshold
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)

0.6
320
2,812
175
147
202
57.47%
47.89%
66.71%
1,616
1,347
1,876

2
320
2,812
81
68
98
28.08%
23.53%
33.79%
790
662
950

6
320
2,812
34
29
40
12.57%
10.48%
14.92%
353
295
419

10
320
2,812
22
18
26
7.99%
6.29%
9.86%
225
177
277
All Systems
20
320
2,812
10
8
14
3.60%
2.50%
4.89%
101
70
138

60
320
2,812
2
1
3
0.50%
0.23%
0.93%
14
6
26

100
320
2,812
1
0
1
0.15%
0.05%
0.32%
4
1
9

200
320
2,812
0
0
0
0.02%
0.00%
0.06%
1
0
2

600
320
2,812
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
120
732
84
75
92
70.21%
62.67%
76.81%
514
459
562

2
120
732
44
39
51
36.97%
32.14%
42.25%
271
235
309

6
120
732
20
18
22
16.52%
14.70%
18.73%
121
108
137
Surface Water
Systems
10
120
732
13
12
15
11.11%
9.75%
12.52%
81
71
92
20
120
732
7
5
8
5.72%
4.57%
6.91%
42
33
51
60
120
732
2
1
2
1.26%
0.76%
1.88%
9
6
14

100
120
732
1
0
1
0.44%
0.17%
0.81%
3
1
6

200
120
732
0
0
0
0.07%
0.01%
0.20%
0
0
1

600
120
732
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
163
1,288
62
48
77
38.13%
29.30%
47.52%
491
377
612

2
163
1,288
20
15
27
12.30%
9.21%
16.43%
158
119
212

6
163
1,288
5
4
7
3.34%
2.29%
4.55%
43
30
59
Ground Water
Systems
10
163
1,288
3
2
4
1.74%
1.16%
2.48%
22
15
32
20
163
1,288
1
1
2
0.74%
0.36%
1.14%
10
5
15
60
163
1,288
0
0
1
0.12%
0.02%
0.34%
2
0
4

100
163
1,288
0
0
0
0.04%
0.00%
0.12%
0
0
2

200
163
1,288
0
0
0
0.00%
0.00%
0.02%
0
0
0

600
163
1,288
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
37
792
29
24
33
77.17%
64.46%
88.59%
611
510
702

2
37
792
17
14
20
45.53%
38.84%
54.20%
361
308
429

6
37
792
9
7
10
23.94%
19.90%
28.26%
190
158
224
Mixed Water
Systems
10
37
792
6
4
7
15.25%
11.45%
19.40%
121
91
154
20
37
792
2
2
3
6.30%
4.07%
9.12%
50
32
72
60
37
792
0
0
0
0.39%
0.09%
1.00%
3
1
8

100
37
792
0
0
0
0.06%
0.01%
0.17%
0
0
1

200
37
792
0
0
0
0.00%
0.00%
0.01%
0
0
0

600
37
792
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 5 of 58
December 2016

-------
D.l - All Disinfection Types
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
14,029,015
84,318,927
8,094,774
6,760,677
9,387,500
61.10%
50.78%
70.70%
51,521,139
42,815,800
59,615,539
14,029,015
84,318,927
3,977,755
3,355,708
4,768,634
31.30%
26.43%
37.41%
26,391,618
22,285,126
31,541,136
14,029,015
84,318,927
1,778,948
1,504,010
2,109,539
14.71%
12.27%
17.54%
12,399,960
10,343,152
14,790,641
14,029,015
84,318,927
1,174,110
969,791
1,408,971
9.67%
7.73%
11.89%
8,152,899
6,520,247
10,027,603
14,029,015
84,318,927
581,138
426,155
745,847
4.70%
3.30%
6.22%
3,959,652
2,781,549
5,242,616
14,029,015
84,318,927
91,087
37,952
175,618
0.57%
0.20%
1.20%
481,362
172,579
1,012,258
14,029,015
84,318,927
25,320
7,240
60,371
0.14%
0.04%
0.36%
118,631
29,864
300,404
14,029,015
84,318,927
2,913
422
8,537
0.01%
0.00%
0.04%
12,530
1,647
37,895
14,029,015
84,318,927
37
1
122
0.00%
0.00%
0.00%
156
4
497
5,187,934
24,488,354
3,762,816
3,353,921
4,126,684
70.77%
62.91%
77.90%
17,331,422
15,405,085
19,077,156
5,187,934
24,488,354
2,072,165
1,817,495
2,373,366
37.23%
32.26%
42.81%
9,116,737
7,901,049
10,482,561
5,187,934
24,488,354
974,076
866,456
1,109,015
16.96%
15.00%
19.48%
4,153,149
3,672,326
4,771,016
5,187,934
24,488,354
659,930
575,777
750,073
11.47%
9.92%
13.11%
2,808,151
2,428,220
3,211,215
5,187,934
24,488,354
333,090
270,170
403,805
5.78%
4.48%
7.20%
1,416,410
1,097,139
1,762,731
5,187,934
24,488,354
62,425
33,137
101,287
1.03%
0.52%
1.77%
251,151
127,362
432,242
5,187,934
24,488,354
18,436
6,749
37,755
0.30%
0.11%
0.63%
72,443
25,763
153,261
5,187,934
24,488,354
2,175
410
5,726
0.03%
0.01%
0.09%
8,383
1,559
22,308
5,187,934
24,488,354
26
1
98
0.00%
0.00%
0.00%
99
4
372
7,021,968
33,342,501
2,903,214
2,222,315
3,626,222
40.46%
31.16%
50.33%
13,491,352
10,389,112
16,782,797
7,021,968
33,342,501
1,016,666
765,678
1,354,525
14.00%
10.63%
18.42%
4,667,078
3,544,121
6,142,072
7,021,968
33,342,501
296,757
212,374
402,977
4.10%
2.91%
5.57%
1,366,867
970,369
1,858,589
7,021,968
33,342,501
171,448
128,180
227,291
2.40%
1.80%
3.18%
799,179
601,805
1,060,740
7,021,968
33,342,501
90,225
48,438
125,424
1.30%
0.71%
1.79%
434,622
235,930
597,622
7,021,968
33,342,501
18,242
2,397
48,628
0.27%
0.04%
0.72%
90,054
11,856
239,693
7,021,968
33,342,501
5,433
300
18,253
0.08%
0.00%
0.27%
26,898
1,487
90,329
7,021,968
33,342,501
678
9
2,603
0.01%
0.00%
0.04%
3,364
45
12,911
7,021,968
33,342,501
11
0
24
0.00%
0.00%
0.00%
56
0
120
1,819,112
26,488,072
1,428,744
1,184,441
1,634,593
78.14%
64.26%
89.68%
20,698,364
17,021,603
23,755,586
1,819,112
26,488,072
888,924
772,535
1,040,743
47.60%
40.92%
56.31%
12,607,802
10,839,956
14,916,502
1,819,112
26,488,072
508,115
425,180
597,546
25.97%
21.52%
30.81%
6,879,944
5,700,458
8,161,036
1,819,112
26,488,072
342,732
265,834
431,607
17.16%
13.18%
21.73%
4,545,570
3,490,222
5,755,648
1,819,112
26,488,072
157,824
107,547
216,618
7.96%
5.47%
10.88%
2,108,620
1,448,480
2,882,262
1,819,112
26,488,072
10,421
2,419
25,703
0.53%
0.13%
1.28%
140,158
33,361
340,323
1,819,112
26,488,072
1,451
190
4,363
0.07%
0.01%
0.21%
19,290
2,614
56,813
1,819,112
26,488,072
60
3
207
0.00%
0.00%
0.01%
783
43
2,676
1,819,112
26,488,072
0
0
0
0.00%
0.00%
0.00%
2
0
5
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 6 of 58
December 2016

-------
D.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number
of Systems
with Any
Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All Systems
0.6
398
398
296
268
324
74.46%
67.41%
81.30%
296
268
324
2
398
398
182
164
203
45.67%
41.26%
50.89%
182
164
203
6
398
398
89
80
99
22.38%
20.12%
24.87%
89
80
99
10
398
398
54
47
61
13.51%
11.81%
15.38%
54
47
61
20
398
398
21
17
26
5.37%
4.38%
6.46%
21
17
26
60
398
398
4
3
5
0.95%
0.68%
1.30%
4
3
5
100
398
398
2
1
2
0.39%
0.22%
0.58%
2
1
2
200
398
398
0
0
1
0.08%
0.02%
0.17%
0
0
1
600
398
398
0
0
0
0.00%
0.00%
0.01%
0
0
0
Surface Water
Systems
0.6
218
218
162
150
175
74.47%
68.79%
80.15%
162
150
175
2
218
218
101
94
110
46.47%
42.98%
50.58%
101
94
110
6
218
218
53
49
57
24.26%
22.37%
26.21%
53
49
57
10
218
218
33
30
37
15.33%
13.95%
16.83%
33
30
37
20
218
218
15
13
17
6.85%
5.83%
7.80%
15
13
17
60
218
218
3
2
4
1.20%
0.82%
1.69%
3
2
4
100
218
218
1
1
2
0.51%
0.29%
0.74%
1
1
2
200
218
218
0
0
1
0.13%
0.03%
0.27%
0
0
1
600
218
218
0
0
0
0.00%
0.00%
0.01%
0
0
0
Ground Water
Systems
0.6
72
72
42
33
50
57.78%
45.75%
69.99%
42
33
50
2
72
72
19
14
24
25.78%
19.87%
33.55%
19
14
24
6
72
72
5
3
7
6.59%
4.40%
9.39%
5
3
7
10
72
72
2
1
3
2.29%
1.13%
3.91%
2
1
3
20
72
72
0
0
1
0.33%
0.08%
0.85%
0
0
1
60
72
72
0
0
0
0.01%
0.00%
0.02%
0
0
0
100
72
72
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
72
72
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
72
72
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
108
108
92
85
98
85.57%
79.05%
91.17%
92
85
98
2
108
108
62
56
68
57.32%
52.04%
63.06%
62
56
68
6
108
108
31
28
35
29.11%
26.05%
32.50%
31
28
35
10
108
108
19
16
22
17.29%
14.63%
20.09%
19
16
22
20
108
108
6
5
8
5.76%
4.33%
7.48%
6
5
8
60
108
108
1
1
1
1.08%
0.84%
1.36%
1
1
1
100
108
108
0
0
1
0.41%
0.22%
0.65%
0
0
1
200
108
108
0
0
0
0.04%
0.01%
0.09%
0
0
0
600
108
108
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 7 of 58
December 2016

-------
D.l - All Disinfection Types
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
141,981,684
141,981,684
110,803,964
95,110,205
123,563,993
78.04%
66.99%
87.03%
110,803,964
95,110,205
123,563,993
141,981,684
141,981,684
68,223,812
60,037,674
80,915,126
48.05%
42.29%
56.99%
68,223,812
60,037,674
80,915,126
141,981,684
141,981,684
33,492,275
28,213,900
39,584,290
23.59%
19.87%
27.88%
33,492,275
28,213,900
39,584,290
141,981,684
141,981,684
19,332,672
15,754,079
24,202,416
13.62%
11.10%
17.05%
19,332,672
15,754,079
24,202,416
141,981,684
141,981,684
8,108,918
6,833,104
9,976,992
5.71%
4.81%
7.03%
8,108,918
6,833,104
9,976,992
141,981,684
141,981,684
3,042,698
2,486,428
3,588,127
2.14%
1.75%
2.53%
3,042,698
2,486,428
3,588,127
141,981,684
141,981,684
1,285,079
721,816
2,010,229
0.91%
0.51%
1.42%
1,285,079
721,816
2,010,229
141,981,684
141,981,684
140,122
41,985
320,317
0.10%
0.03%
0.23%
140,122
41,985
320,317
141,981,684
141,981,684
1,341
98
4,581
0.00%
0.00%
0.00%
1,341
98
4,581
89,237,751
89,237,751
69,607,213
60,001,754
77,436,757
78.00%
67.24%
86.78%
69,607,213
60,001,754
77,436,757
89,237,751
89,237,751
43,477,490
38,634,537
51,643,441
48.72%
43.29%
57.87%
43,477,490
38,634,537
51,643,441
89,237,751
89,237,751
20,935,912
17,765,708
24,691,009
23.46%
19.91%
27.67%
20,935,912
17,765,708
24,691,009
89,237,751
89,237,751
11,723,362
9,618,940
14,493,813
13.14%
10.78%
16.24%
11,723,362
9,618,940
14,493,813
89,237,751
89,237,751
4,240,842
3,436,580
5,261,167
4.75%
3.85%
5.90%
4,240,842
3,436,580
5,261,167
89,237,751
89,237,751
545,678
324,909
843,718
0.61%
0.36%
0.95%
545,678
324,909
843,718
89,237,751
89,237,751
180,053
98,225
307,503
0.20%
0.11%
0.34%
180,053
98,225
307,503
89,237,751
89,237,751
35,845
9,833
74,747
0.04%
0.01%
0.08%
35,845
9,833
74,747
89,237,751
89,237,751
860
50
2,889
0.00%
0.00%
0.00%
860
50
2,889
18,472,835
18,472,835
12,294,985
9,902,557
14,501,662
66.56%
53.61%
78.50%
12,294,985
9,902,557
14,501,662
18,472,835
18,472,835
6,539,720
5,219,291
8,193,072
35.40%
28.25%
44.35%
6,539,720
5,219,291
8,193,072
18,472,835
18,472,835
2,434,530
1,271,690
3,758,865
13.18%
6.88%
20.35%
2,434,530
1,271,690
3,758,865
18,472,835
18,472,835
946,437
313,001
2,123,905
5.12%
1.69%
11.50%
946,437
313,001
2,123,905
18,472,835
18,472,835
157,734
22,062
543,747
0.85%
0.12%
2.94%
157,734
22,062
543,747
18,472,835
18,472,835
3,212
68
13,736
0.02%
0.00%
0.07%
3,212
68
13,736
18,472,835
18,472,835
335
2
1,337
0.00%
0.00%
0.01%
335
2
1,337
18,472,835
18,472,835
10
0
31
0.00%
0.00%
0.00%
10
0
31
18,472,835
18,472,835
0
0
0
0.00%
0.00%
0.00%
0
0
0
34,271,098
34,271,098
28,901,766
25,205,894
31,625,574
84.33%
73.55%
92.28%
28,901,766
25,205,894
31,625,574
34,271,098
34,271,098
18,206,602
16,183,847
21,078,612
53.13%
47.22%
61.51%
18,206,602
16,183,847
21,078,612
34,271,098
34,271,098
10,121,833
9,176,502
11,134,416
29.53%
26.78%
32.49%
10,121,833
9,176,502
11,134,416
34,271,098
34,271,098
6,662,872
5,822,138
7,584,698
19.44%
16.99%
22.13%
6,662,872
5,822,138
7,584,698
34,271,098
34,271,098
3,710,343
3,374,463
4,172,078
10.83%
9.85%
12.17%
3,710,343
3,374,463
4,172,078
34,271,098
34,271,098
2,493,809
2,161,451
2,730,674
7.28%
6.31%
7.97%
2,493,809
2,161,451
2,730,674
34,271,098
34,271,098
1,104,692
623,588
1,701,390
3.22%
1.82%
4.96%
1,104,692
623,588
1,701,390
34,271,098
34,271,098
104,268
32,151
245,539
0.30%
0.09%
0.72%
104,268
32,151
245,539
34,271,098
34,271,098
482
47
1,691
0.00%
0.00%
0.00%
482
47
1,691
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 8 of 58
December 2016

-------
D.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number
of Systems
with Any
Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All Systems
0.6
1,198
45,172
694
605
781
29.27%
22.23%
36.67%
13,221
10,041
16,565
2
1,198
45,172
359
314
413
10.28%
7.78%
13.20%
4,644
3,513
5,963
6
1,198
45,172
164
144
187
3.80%
2.95%
4.90%
1,719
1,334
2,214
10
1,198
45,172
103
89
120
2.42%
1.91%
3.17%
1,095
864
1,432
20
1,198
45,172
48
39
58
1.25%
0.99%
1.60%
565
445
724
60
1,198
45,172
12
8
16
0.37%
0.28%
0.47%
165
127
211
100
1,198
45,172
6
3
8
0.23%
0.15%
0.30%
105
67
136
200
1,198
45,172
2
0
3
0.10%
0.03%
0.19%
46
13
85
600
1,198
45,172
0
0
0
0.01%
0.00%
0.03%
3
0
12
Surface Water
Systems
0.6
560
2,936
399
363
433
69.52%
62.78%
75.61%
2,041
1,843
2,220
2
560
2,936
217
196
241
34.33%
30.55%
38.67%
1,008
897
1,135
6
560
2,936
103
94
113
15.10%
13.59%
16.83%
443
399
494
10
560
2,936
67
60
75
10.19%
9.01%
11.45%
299
265
336
20
560
2,936
34
29
39
5.64%
4.71%
6.61%
166
138
194
60
560
2,936
9
6
12
1.91%
1.36%
2.47%
56
40
73
100
560
2,936
4
2
6
0.93%
0.51%
1.39%
27
15
41
200
560
2,936
1
0
2
0.23%
0.06%
0.50%
7
2
15
600
560
2,936
0
0
0
0.01%
0.00%
0.02%
0
0
1
Ground Water
Systems
0.6
475
39,885
157
118
199
22.90%
16.07%
30.36%
9,133
6,409
12,111
2
475
39,885
51
37
69
5.45%
3.42%
7.87%
2,172
1,364
3,139
6
475
39,885
12
8
18
0.89%
0.35%
1.65%
353
138
656
10
475
39,885
5
3
8
0.31%
0.08%
0.74%
123
34
293
20
475
39,885
2
1
3
0.06%
0.01%
0.18%
24
6
70
60
475
39,885
0
0
1
0.00%
0.00%
0.01%
2
0
6
100
475
39,885
0
0
0
0.00%
0.00%
0.00%
0
0
2
200
475
39,885
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
475
39,885
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
163
2,351
138
124
149
87.09%
76.08%
95.06%
2,047
1,789
2,235
2
163
2,351
92
82
103
62.27%
53.23%
71.81%
1,464
1,251
1,688
6
163
2,351
49
43
56
39.22%
33.89%
45.25%
922
797
1,064
10
163
2,351
31
26
37
28.63%
24.06%
34.14%
673
566
803
20
163
2,351
13
9
16
15.96%
12.82%
19.55%
375
301
460
60
163
2,351
3
2
3
4.57%
3.71%
5.67%
107
87
133
100
163
2,351
1
1
2
3.28%
2.22%
3.97%
77
52
93
200
163
2,351
1
0
1
1.64%
0.47%
2.97%
39
11
70
600
163
2,351
0
0
0
0.12%
0.01%
0.46%
3
0
11
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 9 of 58
December 2016

-------
D.l - All Disinfection Types
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
157,219,620
267,455,451
119,537,655
102,409,638
133,685,702
66.56%
56.06%
75.77%
178,015,826
149,943,910
202,644,485
157,219,620
267,455,451
72,517,281
63,657,362
86,059,457
37.89%
32.55%
45.36%
101,343,604
87,053,866
121,316,500
157,219,620
267,455,451
35,430,578
29,854,411
41,881,558
18.21%
15.21%
21.78%
48,700,256
40,678,409
58,256,836
157,219,620
267,455,451
20,620,719
16,817,837
25,748,772
10.95%
8.83%
13.72%
29,288,650
23,623,459
36,704,164
157,219,620
267,455,451
8,755,876
7,311,941
10,804,760
4.85%
3.84%
6.14%
12,962,373
10,279,696
16,428,868
157,219,620
267,455,451
3,158,458
2,542,527
3,795,584
1.41%
1.07%
1.85%
3,780,678
2,854,485
4,934,970
157,219,620
267,455,451
1,324,262
738,021
2,089,891
0.58%
0.32%
0.94%
1,563,464
857,254
2,518,092
157,219,620
267,455,451
147,850
43,857
337,827
0.08%
0.02%
0.18%
220,619
63,442
482,364
157,219,620
267,455,451
1,621
112
5,545
0.00%
0.00%
0.01%
5,938
304
21,153
94,999,376
118,756,915
73,780,194
63,724,477
82,012,128
76.12%
66.08%
84.49%
90,398,721
78,472,426
100,339,784
94,999,376
118,756,915
45,764,651
40,643,604
54,259,575
45.64%
40.36%
53.87%
54,198,613
47,934,027
63,978,585
94,999,376
118,756,915
22,022,703
18,733,187
25,925,326
21.73%
18.59%
25.49%
25,807,620
22,074,748
30,273,665
94,999,376
118,756,915
12,466,830
10,266,120
15,339,668
12.67%
10.51%
15.41%
15,042,138
12,477,384
18,297,260
94,999,376
118,756,915
4,624,958
3,748,565
5,726,645
5.02%
4.02%
6.22%
5,958,095
4,776,503
7,391,907
94,999,376
118,756,915
628,625
372,755
971,704
0.77%
0.45%
1.20%
913,163
535,898
1,428,812
94,999,376
118,756,915
209,284
111,855
360,905
0.26%
0.14%
0.46%
314,171
163,639
549,523
94,999,376
118,756,915
41,276
11,249
86,644
0.05%
0.01%
0.11%
63,163
17,250
132,868
94,999,376
118,756,915
1,009
60
3,394
0.00%
0.00%
0.00%
1,685
102
5,650
26,043,167
84,263,597
15,344,285
12,220,780
18,326,978
40.99%
31.01%
51.35%
34,539,480
26,128,544
43,269,683
26,043,167
84,263,597
7,590,895
6,002,424
9,603,422
16.11%
11.64%
21.52%
13,575,538
9,809,536
18,133,289
26,043,167
84,263,597
2,736,499
1,485,391
4,173,964
4.95%
2.74%
7.83%
4,168,378
2,311,556
6,597,832
26,043,167
84,263,597
1,119,553
441,410
2,356,365
2.20%
1.10%
4.22%
1,856,956
926,576
3,557,293
26,043,167
84,263,597
248,205
70,510
670,181
0.72%
0.31%
1.43%
607,289
258,510
1,205,219
26,043,167
84,263,597
21,457
2,465
62,382
0.11%
0.01%
0.30%
93,483
11,924
254,411
26,043,167
84,263,597
5,768
302
19,591
0.03%
0.00%
0.11%
27,251
1,490
91,748
26,043,167
84,263,597
688
9
2,635
0.00%
0.00%
0.02%
3,374
45
12,944
26,043,167
84,263,597
11
0
24
0.00%
0.00%
0.00%
56
0
120
36,177,076
64,434,939
30,413,176
26,464,381
33,346,596
82.37%
70.37%
91.62%
53,077,625
45,342,940
59,035,018
36,177,076
64,434,939
19,161,735
17,011,334
22,196,460
52.10%
45.49%
60.84%
33,569,452
29,310,303
39,204,626
36,177,076
64,434,939
10,671,376
9,635,834
11,782,268
29.06%
25.28%
33.19%
18,724,258
16,292,105
21,385,339
36,177,076
64,434,939
7,034,335
6,110,306
8,052,739
19.23%
15.86%
23.05%
12,389,557
10,219,499
14,849,612
36,177,076
64,434,939
3,882,713
3,492,866
4,407,935
9.93%
8.14%
12.15%
6,396,990
5,244,682
7,831,742
36,177,076
64,434,939
2,508,376
2,167,307
2,761,498
4.31%
3.58%
5.05%
2,774,033
2,306,663
3,251,747
36,177,076
64,434,939
1,109,210
625,864
1,709,396
1.90%
1.07%
2.91%
1,222,042
692,125
1,876,820
36,177,076
64,434,939
105,886
32,598
248,548
0.24%
0.07%
0.52%
154,081
46,147
336,552
36,177,076
64,434,939
600
52
2,127
0.01%
0.00%
0.02%
4,197
202
15,383
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 10 of 58
December 2016

-------
D.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number
of Systems
with Any
Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
378
31,621
170
146
194
26.54%
20.00%
33.55%
8,391
6,325
10,609
2
378
31,621
56
46
66
6.12%
4.27%
8.19%
1,934
1,349
2,590
6
378
31,621
12
10
15
0.93%
0.54%
1.42%
293
169
449
10
378
31,621
6
4
7
0.33%
0.17%
0.62%
106
54
196
20
378
31,621
2
2
3
0.09%
0.05%
0.16%
27
16
51
60
378
31,621
1
1
1
0.03%
0.02%
0.03%
9
6
11
100
378
31,621
1
0
1
0.02%
0.01%
0.03%
5
2
8
200
378
31,621
0
0
0
0.00%
0.00%
0.01%
1
0
3
600
378
31,621
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
188
1,682
121
111
132
64.61%
58.88%
70.34%
1,087
990
1,183
2
188
1,682
45
39
50
23.75%
20.81%
26.82%
399
350
451
6
188
1,682
10
9
12
5.48%
4.74%
6.36%
92
80
107
10
188
1,682
5
4
6
2.70%
2.24%
3.21%
45
38
54
20
188
1,682
2
2
3
1.17%
0.90%
1.44%
20
15
24
60
188
1,682
1
1
1
0.51%
0.37%
0.62%
9
6
10
100
188
1,682
1
0
1
0.30%
0.13%
0.47%
5
2
8
200
188
1,682
0
0
0
0.07%
0.01%
0.17%
1
0
3
600
188
1,682
0
0
0
0.00%
0.00%
0.01%
0
0
0
Ground Water
Systems
0.6
183
29,375
43
31
55
23.29%
16.97%
30.22%
6,840
4,985
8,878
2
183
29,375
8
5
11
4.45%
2.90%
6.20%
1,307
850
1,821
6
183
29,375
1
0
2
0.47%
0.20%
0.83%
137
59
243
10
183
29,375
0
0
1
0.13%
0.03%
0.32%
37
10
93
20
183
29,375
0
0
0
0.02%
0.00%
0.06%
5
0
18
60
183
29,375
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
183
29,375
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
183
29,375
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
183
29,375
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
7
564
6
4
7
82.19%
61.96%
97.11%
464
350
548
2
7
564
3
2
4
40.42%
26.30%
56.22%
228
148
317
6
7
564
1
0
1
11.34%
5.52%
17.61%
64
31
99
10
7
564
0
0
1
4.11%
1.12%
8.71%
23
6
49
20
7
564
0
0
0
0.55%
0.06%
1.63%
3
0
9
60
7
564
0
0
0
0.01%
0.00%
0.02%
0
0
0
100
7
564
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
7
564
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
7
564
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 11 of 58
December 2016

-------
D.2 - CL Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR 2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
960,847
30,431,590
431,699
355,701
510,639
33.05%
24.77%
41.85%
10,056,386
7,536,789
12,735,800
960,847
30,431,590
140,734
109,909
176,583
9.31%
6.39%
12.81%
2,831,883
1,943,059
3,899,219
960,847
30,431,590
33,926
25,598
44,524
2.01%
1.21%
3.06%
613,066
368,224
931,262
960,847
30,431,590
16,802
11,215
23,846
0.85%
0.43%
1.51%
259,895
131,609
460,868
960,847
30,431,590
5,516
3,132
8,865
0.22%
0.10%
0.42%
66,418
31,185
129,056
960,847
30,431,590
722
424
1,379
0.02%
0.01%
0.05%
7,097
4,067
13,899
960,847
30,431,590
308
131
527
0.01%
0.00%
0.02%
2,966
1,251
5,110
960,847
30,431,590
64
12
154
0.00%
0.00%
0.00%
614
111
1,481
960,847
30,431,590
1
0
5
0.00%
0.00%
0.00%
12
0
45
444,532
4,260,326
287,485
255,095
319,639
64.67%
57.39%
71.90%
2,755,212
2,444,791
3,063,372
444,532
4,260,326
104,492
88,153
122,678
23.51%
19.83%
27.60%
1,001,436
844,847
1,175,731
444,532
4,260,326
26,864
22,582
32,156
6.04%
5.08%
7.23%
257,458
216,419
308,176
444,532
4,260,326
14,375
10,622
18,147
3.23%
2.39%
4.08%
137,771
101,799
173,920
444,532
4,260,326
5,184
3,103
7,784
1.17%
0.70%
1.75%
49,679
29,740
74,601
444,532
4,260,326
718
424
1,362
0.16%
0.10%
0.31%
6,877
4,064
13,053
444,532
4,260,326
308
131
526
0.07%
0.03%
0.12%
2,947
1,251
5,042
444,532
4,260,326
64
12
154
0.01%
0.00%
0.03%
613
111
1,480
444,532
4,260,326
1
0
5
0.00%
0.00%
0.00%
12
0
45
487,838
24,741,799
119,265
80,506
162,960
24.45%
16.50%
33.40%
6,048,802
4,083,042
8,264,871
487,838
24,741,799
21,513
11,781
33,894
4.41%
2.41%
6.95%
1,091,105
597,488
1,719,000
487,838
24,741,799
2,117
717
4,311
0.43%
0.15%
0.88%
107,392
36,381
218,658
487,838
24,741,799
582
114
1,728
0.12%
0.02%
0.35%
29,524
5,796
87,617
487,838
24,741,799
80
5
335
0.02%
0.00%
0.07%
4,045
246
17,011
487,838
24,741,799
2
0
6
0.00%
0.00%
0.00%
76
0
308
487,838
24,741,799
0
0
1
0.00%
0.00%
0.00%
8
0
27
487,838
24,741,799
0
0
0
0.00%
0.00%
0.00%
0
0
0
487,838
24,741,799
0
0
0
0.00%
0.00%
0.00%
0
0
0
28,477
1,429,466
24,949
20,100
28,041
87.61%
70.58%
98.47%
1,252,371
1,008,956
1,407,556
28,477
1,429,466
14,729
9,975
20,011
51.72%
35.03%
70.27%
739,343
500,724
1,004,487
28,477
1,429,466
4,945
2,299
8,057
17.36%
8.07%
28.29%
248,216
115,424
404,428
28,477
1,429,466
1,845
478
3,971
6.48%
1.68%
13.94%
92,600
24,014
199,331
28,477
1,429,466
253
24
746
0.89%
0.08%
2.62%
12,694
1,200
37,444
28,477
1,429,466
3
0
11
0.01%
0.00%
0.04%
144
2
538
28,477
1,429,466
0
0
1
0.00%
0.00%
0.00%
11
0
41
28,477
1,429,466
0
0
0
0.00%
0.00%
0.00%
0
0
1
28,477
1,429,466
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 12 of 58
December 2016

-------
D.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number
of Systems
with Any
Detects
Exceeding
Threshold -
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation



Threshold
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound





LARGE SYSTEMS (Serving 10,001
-100,000)






0.6
240
2,081
110
91
129
48.87%
40.27%
57.62%
1,017
838
1,199

2
240
2,081
36
28
44
17.31%
13.79%
21.38%
360
287
445

6
240
2,081
9
7
12
5.24%
4.23%
6.44%
109
88
134

10
240
2,081
5
4
6
3.07%
2.44%
3.82%
64
51
80
All Systems
20
240
2,081
2
1
3
1.49%
1.07%
1.88%
31
22
39

60
240
2,081
0
0
1
0.15%
0.03%
0.36%
3
1
7

100
240
2,081
0
0
0
0.03%
0.00%
0.10%
1
0
2

200
240
2,081
0
0
0
0.00%
0.00%
0.01%
0
0
0

600
240
2,081
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
85
519
50
43
57
59.31%
51.17%
67.34%
308
265
349

2
85
519
17
14
21
20.21%
16.61%
24.17%
105
86
125

6
85
519
4
3
5
4.88%
3.81%
6.04%
25
20
31
Surface Water
Systems
10
85
519
2
1
2
2.17%
1.45%
2.92%
11
8
15
20
85
519
0
0
1
0.41%
0.16%
0.76%
2
1
4
60
85
519
0
0
0
0.01%
0.00%
0.02%
0
0
0

100
85
519
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
85
519
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
85
519
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
130
1,027
42
33
51
31.97%
25.17%
39.21%
328
259
403

2
130
1,027
10
8
13
8.00%
5.95%
10.31%
82
61
106

6
130
1,027
2
2
3
1.60%
1.19%
2.11%
16
12
22
Ground Water
Systems
10
130
1,027
1
1
2
0.96%
0.81%
1.17%
10
8
12
20
130
1,027
1
0
1
0.63%
0.36%
0.78%
6
4
8
60
130
1,027
0
0
0
0.15%
0.02%
0.38%
1
0
4

100
130
1,027
0
0
0
0.04%
0.00%
0.15%
0
0
2

200
130
1,027
0
0
0
0.01%
0.00%
0.02%
0
0
0

600
130
1,027
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
25
535
18
15
21
71.20%
58.69%
83.51%
381
314
447

2
25
535
8
7
10
32.37%
26.10%
39.94%
173
140
214

6
25
535
3
3
4
12.58%
10.48%
15.13%
67
56
81
Mixed Water
Systems
10
25
535
2
2
2
7.98%
6.50%
9.79%
43
35
52
20
25
535
1
1
1
4.19%
3.30%
5.09%
22
18
27
60
25
535
0
0
0
0.30%
0.08%
0.64%
2
0
3

100
25
535
0
0
0
0.04%
0.01%
0.10%
0
0
1

200
25
535
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
25
535
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 13 of 58
December 2016

-------
D.2 - CL Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR 2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
9,965,053
61,835,442
4,777,391
3,915,449
5,646,962
52.78%
43.07%
62.24%
32,637,500
26,630,040
38,488,047
9,965,053
61,835,442
1,641,273
1,304,950
2,021,185
20.04%
16.04%
24.63%
12,391,244
9,918,224
15,231,584
9,965,053
61,835,442
489,716
398,334
605,185
6.70%
5.48%
8.27%
4,144,873
3,389,703
5,113,918
9,965,053
61,835,442
307,911
254,785
374,370
4.45%
3.81%
5.33%
2,752,927
2,352,911
3,297,905
9,965,053
61,835,442
175,134
117,066
222,217
2.74%
2.01%
3.32%
1,697,120
1,243,596
2,053,484
9,965,053
61,835,442
24,579
4,164
62,365
0.30%
0.06%
0.73%
186,519
38,185
451,981
9,965,053
61,835,442
6,259
437
20,384
0.06%
0.01%
0.20%
39,617
3,522
123,667
9,965,053
61,835,442
708
11
2,702
0.01%
0.00%
0.02%
3,833
79
14,441
9,965,053
61,835,442
11
0
24
0.00%
0.00%
0.00%
57
0
123
3,398,940
17,345,917
2,044,939
1,751,656
2,341,308
60.16%
51.54%
68.88%
10,436,000
8,939,281
11,948,470
3,398,940
17,345,917
705,285
574,222
853,120
20.75%
16.89%
25.10%
3,599,303
2,930,444
4,353,754
3,398,940
17,345,917
181,626
141,480
229,220
5.34%
4.16%
6.74%
926,897
722,021
1,169,785
3,398,940
17,345,917
82,994
52,446
117,239
2.44%
1.54%
3.45%
423,546
267,652
598,311
3,398,940
17,345,917
16,310
5,863
32,788
0.48%
0.17%
0.96%
83,237
29,920
167,330
3,398,940
17,345,917
283
28
969
0.01%
0.00%
0.03%
1,444
141
4,945
3,398,940
17,345,917
24
1
100
0.00%
0.00%
0.00%
122
6
513
3,398,940
17,345,917
0
0
2
0.00%
0.00%
0.00%
2
0
11
3,398,940
17,345,917
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,358,353
26,592,179
1,855,715
1,458,386
2,277,390
34.63%
27.22%
42.50%
9,209,453
7,237,611
11,302,125
5,358,353
26,592,179
515,237
389,677
652,533
9.62%
7.27%
12.18%
2,556,992
1,933,871
3,238,359
5,358,353
26,592,179
136,719
115,518
165,094
2.55%
2.16%
3.08%
678,504
573,287
819,323
5,358,353
26,592,179
101,825
92,647
112,697
1.90%
1.73%
2.10%
505,333
459,786
559,287
5,358,353
26,592,179
75,048
44,055
93,438
1.40%
0.82%
1.74%
372,446
218,635
463,711
5,358,353
26,592,179
17,751
2,360
46,954
0.33%
0.04%
0.88%
88,095
11,711
233,022
5,358,353
26,592,179
5,368
298
18,002
0.10%
0.01%
0.34%
26,640
1,479
89,340
5,358,353
26,592,179
676
9
2,595
0.01%
0.00%
0.05%
3,353
45
12,877
5,358,353
26,592,179
11
0
24
0.00%
0.00%
0.00%
56
0
120
1,207,761
17,897,346
876,738
705,407
1,028,264
72.59%
58.41%
85.14%
12,992,047
10,453,149
15,237,452
1,207,761
17,897,346
420,751
341,051
515,532
34.84%
28.24%
42.68%
6,234,949
5,053,908
7,639,471
1,207,761
17,897,346
171,370
141,335
210,871
14.19%
11.70%
17.46%
2,539,471
2,094,395
3,124,810
1,207,761
17,897,346
123,092
109,691
144,434
10.19%
9.08%
11.96%
1,824,048
1,625,474
2,140,308
1,207,761
17,897,346
83,775
67,148
95,990
6.94%
5.56%
7.95%
1,241,437
995,041
1,422,443
1,207,761
17,897,346
6,544
1,777
14,442
0.54%
0.15%
1.20%
96,980
26,334
214,014
1,207,761
17,897,346
868
137
2,282
0.07%
0.01%
0.19%
12,856
2,037
33,814
1,207,761
17,897,346
32
2
105
0.00%
0.00%
0.01%
478
34
1,553
1,207,761
17,897,346
0
0
0
0.00%
0.00%
0.00%
1
0
2
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 14 of 58
December 2016

-------
D.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number
of Systems
with Any
Detects
Exceeding
Threshold -
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation



Threshold
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
207
207
122
106
138
58.88%
51.29%
66.63%
122
106
138

2
207
207
45
38
54
21.83%
18.30%
25.97%
45
38
54

6
207
207
13
11
15
6.31%
5.30%
7.45%
13
11
15

10
207
207
7
6
9
3.56%
2.89%
4.36%
7
6
9
All Systems
20
207
207
4
3
5
1.80%
1.36%
2.28%
4
3
5

60
207
207
1
0
1
0.25%
0.07%
0.51%
1
0
1

100
207
207
0
0
0
0.05%
0.01%
0.13%
0
0
0

200
207
207
0
0
0
0.00%
0.00%
0.01%
0
0
0

600
207
207
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
110
110
61
54
69
55.33%
48.69%
62.68%
61
54
69

2
110
110
19
15
22
16.84%
13.93%
20.32%
19
15
22

6
110
110
5
4
5
4.16%
3.47%
4.95%
5
4
5
Surface Water
Systems
10
110
110
3
2
3
2.53%
2.19%
2.95%
3
2
3
20
110
110
2
1
2
1.59%
1.24%
1.85%
2
1
2
60
110
110
0
0
1
0.29%
0.08%
0.63%
0
0
1

100
110
110
0
0
0
0.07%
0.01%
0.19%
0
0
0

200
110
110
0
0
0
0.01%
0.00%
0.02%
0
0
0

600
110
110
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
45
45
22
17
26
48.28%
38.74%
57.85%
22
17
26

2
45
45
8
6
10
17.04%
13.25%
21.49%
8
6
10

6
45
45
2
1
2
3.45%
2.33%
4.75%
2
1
2
Ground Water
Systems
10
45
45
0
0
1
1.11%
0.49%
2.00%
0
0
1
20
45
45
0
0
0
0.17%
0.03%
0.51%
0
0
0
60
45
45
0
0
0
0.00%
0.00%
0.02%
0
0
0

100
45
45
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
45
45
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
45
45
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
52
52
39
35
43
75.57%
67.66%
82.59%
39
35
43

2
52
52
19
17
22
36.55%
31.91%
41.79%
19
17
22

6
52
52
7
6
8
13.31%
11.74%
15.07%
7
6
8
Mixed Water
Systems
10
52
52
4
3
5
7.85%
6.45%
9.38%
4
3
5
20
52
52
2
1
2
3.64%
2.77%
4.71%
2
1
2
60
52
52
0
0
0
0.36%
0.14%
0.68%
0
0
0

100
52
52
0
0
0
0.05%
0.01%
0.13%
0
0
0

200
52
52
0
0
0
0.00%
0.00%
0.01%
0
0
0

600
52
52
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 15 of 58
December 2016

-------
D.2 - CL Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR 2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
70,477,886
70,477,886
45,322,099
37,077,002
53,100,452
64.31%
52.61%
75.34%
45,322,099
37,077,002
53,100,452
70,477,886
70,477,886
16,818,119
13,245,992
22,147,167
23.86%
18.79%
31.42%
16,818,119
13,245,992
22,147,167
70,477,886
70,477,886
5,282,334
3,930,771
6,626,904
7.50%
5.58%
9.40%
5,282,334
3,930,771
6,626,904
70,477,886
70,477,886
2,490,544
1,505,984
3,830,949
3.53%
2.14%
5.44%
2,490,544
1,505,984
3,830,949
70,477,886
70,477,886
807,909
527,294
1,296,636
1.15%
0.75%
1.84%
807,909
527,294
1,296,636
70,477,886
70,477,886
91,062
26,658
197,602
0.13%
0.04%
0.28%
91,062
26,658
197,602
70,477,886
70,477,886
18,256
2,934
50,911
0.03%
0.00%
0.07%
18,256
2,934
50,911
70,477,886
70,477,886
1,184
78
3,829
0.00%
0.00%
0.01%
1,184
78
3,829
70,477,886
70,477,886
4
0
16
0.00%
0.00%
0.00%
4
0
16
41,269,868
41,269,868
25,786,693
21,951,559
30,010,866
62.48%
53.19%
72.72%
25,786,693
21,951,559
30,010,866
41,269,868
41,269,868
9,458,608
7,692,587
12,056,027
22.92%
18.64%
29.21%
9,458,608
7,692,587
12,056,027
41,269,868
41,269,868
3,069,607
2,205,161
3,918,219
7.44%
5.34%
9.49%
3,069,607
2,205,161
3,918,219
41,269,868
41,269,868
1,439,572
829,262
2,216,972
3.49%
2.01%
5.37%
1,439,572
829,262
2,216,972
41,269,868
41,269,868
454,067
297,344
677,188
1.10%
0.72%
1.64%
454,067
297,344
677,188
41,269,868
41,269,868
61,402
15,660
135,655
0.15%
0.04%
0.33%
61,402
15,660
135,655
41,269,868
41,269,868
14,002
1,941
39,655
0.03%
0.00%
0.10%
14,002
1,941
39,655
41,269,868
41,269,868
1,012
58
3,278
0.00%
0.00%
0.01%
1,012
58
3,278
41,269,868
41,269,868
4
0
14
0.00%
0.00%
0.00%
4
0
14
11,230,816
11,230,816
6,333,361
4,887,138
7,678,997
56.39%
43.52%
68.37%
6,333,361
4,887,138
7,678,997
11,230,816
11,230,816
2,392,743
1,835,215
3,151,714
21.31%
16.34%
28.06%
2,392,743
1,835,215
3,151,714
11,230,816
11,230,816
891,802
603,852
1,136,666
7.94%
5.38%
10.12%
891,802
603,852
1,136,666
11,230,816
11,230,816
347,328
131,440
733,519
3.09%
1.17%
6.53%
347,328
131,440
733,519
11,230,816
11,230,816
61,543
7,679
226,877
0.55%
0.07%
2.02%
61,543
7,679
226,877
11,230,816
11,230,816
1,696
20
7,893
0.02%
0.00%
0.07%
1,696
20
7,893
11,230,816
11,230,816
206
1
853
0.00%
0.00%
0.01%
206
1
853
11,230,816
11,230,816
7
0
22
0.00%
0.00%
0.00%
7
0
22
11,230,816
11,230,816
0
0
0
0.00%
0.00%
0.00%
0
0
0
17,977,203
17,977,203
13,202,045
10,238,305
15,410,589
73.44%
56.95%
85.72%
13,202,045
10,238,305
15,410,589
17,977,203
17,977,203
4,966,768
3,718,190
6,939,426
27.63%
20.68%
38.60%
4,966,768
3,718,190
6,939,426
17,977,203
17,977,203
1,320,925
1,121,758
1,572,019
7.35%
6.24%
8.74%
1,320,925
1,121,758
1,572,019
17,977,203
17,977,203
703,643
545,282
880,458
3.91%
3.03%
4.90%
703,643
545,282
880,458
17,977,203
17,977,203
292,299
222,272
392,571
1.63%
1.24%
2.18%
292,299
222,272
392,571
17,977,203
17,977,203
27,964
10,977
54,054
0.16%
0.06%
0.30%
27,964
10,977
54,054
17,977,203
17,977,203
4,048
992
10,402
0.02%
0.01%
0.06%
4,048
992
10,402
17,977,203
17,977,203
165
19
529
0.00%
0.00%
0.00%
165
19
529
17,977,203
17,977,203
0
0
1
0.00%
0.00%
0.00%
0
0
1
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 16 of 58
December 2016

-------
D.2 - CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number
of Systems
with Any
Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All Systems
0.6
825
33,909
402
343
461
48.67%
41.59%
55.92%
9,530
7,269
11,946
2
825
33,909
136
113
163
16.54%
13.64%
19.81%
2,340
1,674
3,088
6
825
33,909
34
28
42
4.17%
3.40%
5.06%
416
268
599
10
825
33,909
18
14
23
2.19%
1.73%
2.75%
177
110
285
20
825
33,909
8
6
11
0.99%
0.72%
1.28%
62
41
95
60
825
33,909
2
1
3
0.21%
0.11%
0.35%
12
7
19
100
825
33,909
1
0
1
0.09%
0.03%
0.17%
6
2
10
200
825
33,909
0
0
0
0.02%
0.00%
0.05%
1
0
3
600
825
33,909
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
383
2,310
233
208
258
60.77%
54.24%
67.47%
1,455
1,309
1,601
2
383
2,310
80
69
93
20.98%
17.90%
24.37%
523
451
599
6
383
2,310
19
16
23
4.97%
4.17%
5.88%
122
103
144
10
383
2,310
10
8
12
2.53%
2.05%
3.07%
59
48
72
20
383
2,310
4
3
5
1.12%
0.83%
1.40%
23
17
30
60
383
2,310
1
1
2
0.34%
0.20%
0.49%
9
6
11
100
383
2,310
1
0
1
0.17%
0.06%
0.28%
5
2
8
200
383
2,310
0
0
0
0.04%
0.01%
0.09%
1
0
3
600
383
2,310
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
358
30,448
106
81
132
29.58%
22.68%
36.96%
7,191
5,261
9,307
2
358
30,448
26
19
34
7.32%
5.31%
9.61%
1,397
918
1,937
6
358
30,448
4
3
6
1.25%
0.83%
1.79%
155
72
267
10
358
30,448
2
1
3
0.55%
0.37%
0.84%
47
18
106
20
358
30,448
1
0
1
0.26%
0.14%
0.38%
11
4
26
60
358
30,448
0
0
1
0.05%
0.01%
0.14%
2
0
4
100
358
30,448
0
0
0
0.02%
0.00%
0.05%
0
0
2
200
358
30,448
0
0
0
0.00%
0.00%
0.01%
0
0
0
600
358
30,448
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
84
1,151
63
54
71
74.82%
64.52%
84.07%
884
699
1,038
2
84
1,151
30
25
36
35.63%
29.72%
42.44%
420
305
553
6
84
1,151
11
9
13
12.93%
10.85%
15.30%
138
93
188
10
84
1,151
6
5
8
7.58%
6.02%
9.44%
70
44
106
20
84
1,151
3
2
4
3.55%
2.70%
4.57%
27
19
39
60
84
1,151
0
0
1
0.31%
0.11%
0.61%
2
1
4
100
84
1,151
0
0
0
0.04%
0.01%
0.11%
0
0
1
200
84
1,151
0
0
0
0.00%
0.00%
0.01%
0
0
0
600
84
1,151
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 17 of 58
December 2016

-------
D.2 - CL Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by
UCMR 2 Systems Predicted to have
Any Detects Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
81,403,786
162,744,918
50,531,189
41,348,151
59,258,054
62.07%
50.79%
72.80%
88,015,984
71,243,831
104,324,299
81,403,786
162,744,918
18,600,126
14,660,851
24,344,934
22.85%
18.01%
29.91%
32,041,247
25,107,274
41,277,969
81,403,786
162,744,918
5,805,975
4,354,703
7,276,613
7.13%
5.35%
8.94%
10,040,272
7,688,697
12,672,084
81,403,786
162,744,918
2,815,257
1,771,984
4,229,164
3.46%
2.18%
5.20%
5,503,365
3,990,504
7,589,723
81,403,786
162,744,918
988,559
647,492
1,527,719
1.21%
0.80%
1.88%
2,571,447
1,802,075
3,479,176
81,403,786
162,744,918
116,362
31,246
261,346
0.14%
0.04%
0.32%
284,677
68,910
663,482
81,403,786
162,744,918
24,823
3,501
71,822
0.03%
0.00%
0.09%
60,839
7,707
179,687
81,403,786
162,744,918
1,956
101
6,685
0.00%
0.00%
0.01%
5,631
268
19,751
81,403,786
162,744,918
17
0
45
0.00%
0.00%
0.00%
73
1
184
45,113,339
62,876,111
28,119,116
23,958,309
32,671,812
62.33%
53.11%
72.42%
38,977,905
33,335,631
45,022,708
45,113,339
62,876,111
10,268,385
8,354,962
13,031,825
22.76%
18.52%
28.89%
14,059,347
11,467,879
17,585,512
45,113,339
62,876,111
3,278,096
2,369,223
4,179,594
7.27%
5.25%
9.26%
4,253,962
3,143,601
5,396,180
45,113,339
62,876,111
1,536,942
892,331
2,352,359
3.41%
1.98%
5.21%
2,000,890
1,198,713
2,989,203
45,113,339
62,876,111
475,561
306,309
717,760
1.05%
0.68%
1.59%
586,983
357,003
919,119
45,113,339
62,876,111
62,402
16,112
137,986
0.14%
0.04%
0.31%
69,723
19,866
153,653
45,113,339
62,876,111
14,333
2,073
40,282
0.03%
0.00%
0.09%
17,071
3,198
45,210
45,113,339
62,876,111
1,076
70
3,434
0.00%
0.00%
0.01%
1,627
170
4,768
45,113,339
62,876,111
5
0
19
0.00%
0.00%
0.00%
16
0
60
17,077,006
62,564,793
8,308,341
6,426,031
10,119,347
48.65%
37.63%
59.26%
21,591,616
16,207,791
27,245,993
17,077,006
62,564,793
2,929,493
2,236,672
3,838,140
17.15%
13.10%
22.48%
6,040,840
4,366,573
8,109,073
17,077,006
62,564,793
1,030,639
720,087
1,306,072
6.04%
4.22%
7.65%
1,677,698
1,213,519
2,174,647
17,077,006
62,564,793
449,735
224,202
847,943
2.63%
1.31%
4.97%
882,185
597,022
1,380,422
17,077,006
62,564,793
136,671
51,739
320,651
0.80%
0.30%
1.88%
438,035
226,560
707,599
17,077,006
62,564,793
19,449
2,380
54,853
0.11%
0.01%
0.32%
89,867
11,732
241,222
17,077,006
62,564,793
5,574
299
18,856
0.03%
0.00%
0.11%
26,854
1,480
90,220
17,077,006
62,564,793
683
9
2,617
0.00%
0.00%
0.02%
3,361
45
12,900
17,077,006
62,564,793
11
0
24
0.00%
0.00%
0.00%
56
0
120
19,213,441
37,304,014
14,103,732
10,963,811
16,466,894
73.41%
57.06%
85.71%
27,446,463
21,700,410
32,055,598
19,213,441
37,304,014
5,402,248
4,069,216
7,474,969
28.12%
21.18%
38.90%
11,941,060
9,272,822
15,583,384
19,213,441
37,304,014
1,497,240
1,265,393
1,790,946
7.79%
6.59%
9.32%
4,108,613
3,331,577
5,101,257
19,213,441
37,304,014
828,579
655,451
1,028,863
4.31%
3.41%
5.35%
2,620,291
2,194,770
3,220,097
19,213,441
37,304,014
376,327
289,444
489,307
1.96%
1.51%
2.55%
1,546,429
1,218,512
1,852,458
19,213,441
37,304,014
34,511
12,754
68,507
0.18%
0.07%
0.36%
125,087
37,313
268,607
19,213,441
37,304,014
4,915
1,129
12,685
0.03%
0.01%
0.07%
16,914
3,029
44,257
19,213,441
37,304,014
197
21
634
0.00%
0.00%
0.00%
643
53
2,083
19,213,441
37,304,014
0
0
1
0.00%
0.00%
0.00%
1
0
4
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 18 of 58
December 2016

-------
D.3 - CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
Threshold - National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
20
849
20
18
20
94.58%
76.58%
99.99%
803
650
849
2
20
849
18
16
19
73.87%
58.79%
91.46%
627
499
776
6
20
849
13
11
15
37.35%
25.09%
52.74%
317
213
448
10
20
849
10
9
12
25.04%
18.87%
35.59%
212
160
302
20
20
849
7
6
8
17.06%
15.33%
20.54%
145
130
174
60
20
849
3
3
4
12.02%
10.97%
12.85%
102
93
109
100
20
849
2
2
3
9.88%
6.96%
11.31%
84
59
96
200
20
849
1
0
2
4.98%
1.45%
8.93%
42
12
76
600
20
849
0
0
0
0.36%
0.02%
1.33%
3
0
11
Surface Water
Systems
0.6
14
125
14
13
14
99.18%
94.87%
100.00%
124
119
125
2
14
125
13
13
14
94.49%
91.14%
98.56%
118
114
123
6
14
125
11
10
12
77.45%
71.69%
83.49%
97
90
105
10
14
125
9
8
10
62.88%
57.20%
68.94%
79
72
86
20
14
125
6
5
7
44.29%
39.20%
49.25%
55
49
62
60
14
125
2
2
3
17.66%
13.50%
22.17%
22
17
28
100
14
125
1
1
2
9.41%
6.72%
12.35%
12
8
15
200
14
125
0
0
1
3.14%
1.06%
5.68%
4
1
7
600
14
125
0
0
0
0.13%
0.01%
0.42%
0
0
1
Ground Water
Systems
0.6
3
482
3
2
3
92.02%
69.04%
99.98%
443
332
481
2
3
482
2
1
3
66.89%
49.53%
87.87%
322
239
423
6
3
482
1
0
1
24.26%
8.09%
43.74%
117
39
211
10
3
482
0
0
1
9.77%
1.54%
24.29%
47
7
117
20
3
482
0
0
0
1.69%
0.08%
6.19%
8
0
30
60
3
482
0
0
0
0.03%
0.00%
0.14%
0
0
1
100
3
482
0
0
0
0.00%
0.00%
0.01%
0
0
0
200
3
482
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
3
482
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
3
242
3
2
3
97.31%
82.12%
100.00%
235
199
242
2
3
242
2
2
3
77.10%
60.47%
94.95%
186
146
230
6
3
242
1
1
2
42.63%
34.83%
54.73%
103
84
132
10
3
242
1
1
1
35.83%
33.52%
40.84%
87
81
99
20
3
242
1
1
1
33.58%
33.34%
34.26%
81
81
83
60
3
242
1
1
1
32.99%
31.48%
33.33%
80
76
81
100
3
242
1
1
1
29.78%
20.95%
33.26%
72
51
80
200
3
242
0
0
1
15.85%
4.53%
28.40%
38
11
69
600
3
242
0
0
0
1.21%
0.05%
4.46%
3
0
11
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 19 of 58
December 2016

-------
D.3 - CA Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
83,754
1,335,490
81,583
72,872
83,752
94.59%
74.43%
100.00%
1,263,275
993,974
1,335,424
83,754
1,335,490
71,406
63,557
80,356
72.40%
56.53%
92.31%
966,854
754,922
1,232,855
83,754
1,335,490
49,830
42,656
58,726
37.30%
27.03%
51.52%
498,094
360,963
687,984
83,754
1,335,490
40,743
36,033
47,188
27.22%
22.40%
36.00%
363,474
299,116
480,768
83,754
1,335,490
31,560
27,972
35,158
20.53%
18.52%
23.40%
274,187
247,365
312,453
83,754
1,335,490
16,340
13,156
19,809
13.35%
11.66%
14.95%
178,223
155,718
199,697
83,754
1,335,490
10,635
7,628
13,411
10.24%
7.26%
12.11%
136,696
97,014
161,677
83,754
1,335,490
4,351
1,354
7,859
4.87%
1.44%
8.76%
65,086
19,251
116,988
83,754
1,335,490
237
13
823
0.33%
0.01%
1.19%
4,406
200
15,955
54,146
317,258
53,881
52,494
54,146
99.51%
96.95%
100.00%
315,706
307,576
317,258
54,146
317,258
51,876
49,909
53,478
95.81%
92.17%
98.77%
303,957
292,430
313,342
54,146
317,258
42,416
38,496
46,548
78.34%
71.10%
85.97%
248,529
225,561
272,741
54,146
317,258
36,121
32,626
39,937
66.71%
60.26%
73.76%
211,647
191,167
234,004
54,146
317,258
28,112
24,709
31,168
51.92%
45.63%
57.56%
164,718
144,777
182,620
54,146
317,258
13,114
10,080
16,541
24.22%
18.62%
30.55%
76,842
59,060
96,919
54,146
317,258
7,725
5,582
10,161
14.27%
10.31%
18.77%
45,262
32,704
59,534
54,146
317,258
2,802
912
5,084
5.17%
1.68%
9.39%
16,417
5,342
29,789
54,146
317,258
118
8
388
0.22%
0.01%
0.72%
694
46
2,273
10,110
405,603
8,870
5,301
10,108
87.74%
52.44%
99.98%
355,857
212,678
405,540
10,110
405,603
5,664
3,867
8,620
56.02%
38.25%
85.26%
227,215
155,160
345,825
10,110
405,603
1,911
540
3,748
18.91%
5.35%
37.07%
76,682
21,683
150,373
10,110
405,603
762
104
2,178
7.53%
1.03%
21.54%
30,561
4,187
87,377
10,110
405,603
132
5
512
1.30%
0.05%
5.06%
5,284
210
20,523
10,110
405,603
2
0
11
0.02%
0.00%
0.11%
91
0
436
10,110
405,603
0
0
1
0.00%
0.00%
0.01%
8
0
35
10,110
405,603
0
0
0
0.00%
0.00%
0.00%
0
0
1
10,110
405,603
0
0
0
0.00%
0.00%
0.00%
0
0
0
19,498
612,628
18,832
15,077
19,498
96.59%
77.33%
100.00%
591,712
473,720
612,627
19,498
612,628
13,866
9,781
18,259
71.12%
50.17%
93.64%
435,681
307,333
573,688
19,498
612,628
5,502
3,619
8,430
28.22%
18.56%
43.23%
172,882
113,719
264,869
19,498
612,628
3,860
3,302
5,073
19.79%
16.94%
26.02%
121,267
103,762
159,387
19,498
612,628
3,316
3,258
3,479
17.01%
16.71%
17.84%
104,185
102,378
109,309
19,498
612,628
3,224
3,076
3,257
16.53%
15.78%
16.71%
101,291
96,658
102,342
19,498
612,628
2,910
2,047
3,250
14.92%
10.50%
16.67%
91,426
64,310
102,108
19,498
612,628
1,549
443
2,775
7.94%
2.27%
14.23%
48,669
13,909
87,198
19,498
612,628
118
5
435
0.61%
0.03%
2.23%
3,713
154
13,682
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 20 of 58
December 2016

-------
D.3 - CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
Threshold - National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation


Systems
Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)

0.6
55
435
49
46
52
89.88%
84.41%
94.53%
391
367
411

2
55
435
36
33
40
68.35%
62.93%
73.81%
297
273
321

6
55
435
21
18
23
42.63%
37.56%
47.56%
185
163
207

10
55
435
15
12
17
30.16%
25.12%
35.41%
131
109
154
All Systems
20
55
435
7
6
9
14.27%
10.37%
18.96%
62
45
82

60
55
435
2
1
2
2.38%
1.32%
3.87%
10
6
17

100
55
435
1
0
1
0.78%
0.29%
1.49%
3
1
6

200
55
435
0
0
0
0.11%
0.02%
0.33%
0
0
1

600
55
435
0
0
0
0.00%
0.00%
0.01%
0
0
0

0.6
30
183
29
29
30
97.98%
95.08%
99.79%
179
174
183

2
30
183
24
23
26
81.22%
76.16%
86.36%
149
139
158

6
30
183
14
13
16
48.06%
44.65%
51.75%
88
82
95
Surface Water
Systems
10
30
183
10
10
11
34.92%
31.93%
37.82%
64
58
69
20
30
183
6
5
7
19.49%
16.75%
22.27%
36
31
41
60
30
183
1
1
2
4.80%
3.01%
6.67%
9
6
12

100
30
183
1
0
1
1.72%
0.69%
3.07%
3
1
6

200
30
183
0
0
0
0.26%
0.04%
0.77%
0
0
1

600
30
183
0
0
0
0.00%
0.00%
0.02%
0
0
0

0.6
21
166
16
14
18
75.74%
64.60%
85.90%
126
107
143

2
21
166
8
6
10
37.99%
29.96%
46.47%
63
50
77

6
21
166
3
2
4
13.73%
9.79%
17.68%
23
16
29
Ground Water
Systems
10
21
166
1
1
2
6.86%
3.85%
10.05%
11
6
17
20
21
166
0
0
1
1.75%
0.55%
3.75%
3
1
6
60
21
166
0
0
0
0.06%
0.00%
0.23%
0
0
0

100
21
166
0
0
0
0.01%
0.00%
0.04%
0
0
0

200
21
166
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
21
166
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
4
86
4
4
4
100.00%
100.00%
100.00%
86
86
86

2
4
86
4
4
4
99.71%
98.53%
100.00%
85
84
86

6
4
86
3
3
4
87.04%
76.22%
96.52%
75
65
83
Mixed Water
Systems
10
4
86
3
2
3
65.17%
51.82%
79.41%
56
44
68
20
4
86
1
1
2
27.35%
15.78%
41.34%
23
14
35
60
4
86
0
0
0
1.70%
0.29%
4.95%
1
0
4

100
4
86
0
0
0
0.26%
0.02%
0.94%
0
0
1

200
4
86
0
0
0
0.01%
0.00%
0.05%
0
0
0

600
4
86
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 21 of 58
December 2016

-------
D.3 - CA Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
2,969,366
13,281,323
2,669,541
2,484,640
2,815,481
91.18%
85.77%
95.46%
12,110,093
11,390,886
12,678,478
2,969,366
13,281,323
1,973,217
1,790,498
2,170,504
70.84%
65.37%
76.62%
9,408,312
8,681,735
10,176,135
2,969,366
13,281,323
1,129,420
995,477
1,278,812
44.67%
39.32%
50.32%
5,932,754
5,222,515
6,683,118
2,969,366
13,281,323
783,118
668,277
908,928
31.35%
26.05%
37.24%
4,164,102
3,460,346
4,945,310
2,969,366
13,281,323
380,519
299,698
475,877
14.32%
10.61%
18.81%
1,901,393
1,408,763
2,498,784
2,969,366
13,281,323
64,808
33,630
107,393
2.05%
1.00%
3.64%
272,646
132,352
483,537
2,969,366
13,281,323
18,783
6,792
38,840
0.57%
0.20%
1.22%
75,440
26,201
161,971
2,969,366
13,281,323
2,192
410
5,774
0.06%
0.01%
0.17%
8,531
1,566
22,676
2,969,366
13,281,323
26
1
98
0.00%
0.00%
0.00%
99
4
373
1,609,787
6,122,088
1,574,280
1,526,037
1,606,184
97.79%
94.80%
99.78%
5,987,054
5,803,583
6,108,388
1,609,787
6,122,088
1,292,044
1,205,711
1,383,142
80.26%
74.90%
85.92%
4,913,701
4,585,372
5,260,148
1,609,787
6,122,088
764,476
702,918
837,507
47.49%
43.67%
52.03%
2,907,333
2,673,226
3,185,074
1,609,787
6,122,088
554,623
504,032
606,470
34.45%
31.31%
37.67%
2,109,256
1,916,854
2,306,430
1,609,787
6,122,088
302,192
257,281
349,961
18.77%
15.98%
21.74%
1,149,248
978,450
1,330,915
1,609,787
6,122,088
60,627
32,961
95,133
3.77%
2.05%
5.91%
230,566
125,353
361,797
1,609,787
6,122,088
18,152
6,737
36,574
1.13%
0.42%
2.27%
69,032
25,623
139,091
1,609,787
6,122,088
2,162
410
5,665
0.13%
0.03%
0.35%
8,222
1,558
21,542
1,609,787
6,122,088
26
1
97
0.00%
0.00%
0.01%
98
4
371
1,095,758
4,295,660
831,440
694,782
945,476
75.88%
63.41%
86.29%
3,259,463
2,723,729
3,706,515
1,095,758
4,295,660
418,086
324,641
523,542
38.15%
29.63%
47.78%
1,639,009
1,272,678
2,052,424
1,095,758
4,295,660
134,955
90,312
186,327
12.32%
8.24%
17.00%
529,058
354,047
730,453
1,095,758
4,295,660
61,335
34,507
92,887
5.60%
3.15%
8.48%
240,448
135,275
364,141
1,095,758
4,295,660
14,139
4,340
28,679
1.29%
0.40%
2.62%
55,431
17,015
112,429
1,095,758
4,295,660
476
37
1,633
0.04%
0.00%
0.15%
1,868
144
6,403
1,095,758
4,295,660
63
2
248
0.01%
0.00%
0.02%
249
8
971
1,095,758
4,295,660
3
0
9
0.00%
0.00%
0.00%
10
0
34
1,095,758
4,295,660
0
0
0
0.00%
0.00%
0.00%
0
0
0
263,821
2,863,575
263,821
263,821
263,821
100.00%
100.00%
100.00%
2,863,575
2,863,575
2,863,575
263,821
2,863,575
263,086
260,146
263,820
99.72%
98.61%
100.00%
2,855,602
2,823,685
2,863,563
263,821
2,863,575
229,990
202,247
254,978
87.18%
76.66%
96.65%
2,496,362
2,195,241
2,767,591
263,821
2,863,575
167,160
129,739
209,571
63.36%
49.18%
79.44%
1,814,398
1,408,217
2,274,738
263,821
2,863,575
64,188
38,077
97,238
24.33%
14.43%
36.86%
696,715
413,298
1,055,441
263,821
2,863,575
3,705
632
10,626
1.40%
0.24%
4.03%
40,212
6,856
115,337
263,821
2,863,575
567
53
2,019
0.22%
0.02%
0.77%
6,159
570
21,910
263,821
2,863,575
27
1
101
0.01%
0.00%
0.04%
298
9
1,100
263,821
2,863,575
0
0
0
0.00%
0.00%
0.00%
1
0
2
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 22 of 58
December 2016

-------
D.3 - CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
Threshold - National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation


Systems
Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
129
129
124
119
127
95.92%
92.58%
98.47%
124
119
127

2
129
129
103
99
109
80.16%
76.37%
84.26%
103
99
109

6
129
129
60
56
65
46.58%
43.12%
50.07%
60
56
65

10
129
129
37
34
41
29.03%
26.23%
31.84%
37
34
41
All Systems
20
129
129
15
12
17
11.32%
9.65%
13.11%
15
12
17

60
129
129
2
2
3
1.77%
1.33%
2.28%
2
2
3

100
129
129
1
1
1
0.80%
0.49%
1.08%
1
1
1

200
129
129
0
0
1
0.22%
0.05%
0.45%
0
0
1

600
129
129
0
0
0
0.01%
0.00%
0.02%
0
0
0

0.6
84
84
82
80
83
97.23%
95.08%
99.03%
82
80
83

2
84
84
70
68
73
83.81%
81.15%
86.65%
70
68
73

6
84
84
43
41
45
51.09%
48.29%
53.72%
43
41
45
Surface Water
Systems
10
84
84
28
26
30
33.13%
30.76%
35.37%
28
26
30
20
84
84
12
11
14
14.62%
12.95%
16.24%
12
11
14
60
84
84
2
2
3
2.66%
2.02%
3.37%
2
2
3

100
84
84
1
1
1
1.22%
0.75%
1.65%
1
1
1

200
84
84
0
0
1
0.34%
0.08%
0.69%
0
0
1

600
84
84
0
0
0
0.01%
0.00%
0.03%
0
0
0

0.6
17
17
15
13
16
85.76%
76.38%
93.36%
15
13
16

2
17
17
9
8
11
54.68%
46.47%
64.03%
9
8
11

6
17
17
3
2
4
17.97%
12.41%
24.29%
3
2
4
Ground Water
Systems
10
17
17
1
1
2
6.61%
3.48%
10.66%
1
1
2
20
17
17
0
0
0
0.97%
0.28%
2.22%
0
0
0
60
17
17
0
0
0
0.01%
0.00%
0.05%
0
0
0

100
17
17
0
0
0
0.00%
0.00%
0.01%
0
0
0

200
17
17
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
17
17
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
28
28
27
27
28
98.14%
94.89%
99.91%
27
27
28

2
28
28
24
22
25
84.68%
80.19%
89.38%
24
22
25

6
28
28
14
13
15
50.41%
46.23%
54.77%
14
13
15
Mixed Water
Systems
10
28
28
9
7
10
30.36%
26.47%
34.12%
9
7
10
20
28
28
2
2
3
7.69%
5.44%
10.32%
2
2
3
60
28
28
0
0
0
0.17%
0.06%
0.38%
0
0
0

100
28
28
0
0
0
0.02%
0.00%
0.04%
0
0
0

200
28
28
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
28
28
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 23 of 58
December 2016

-------
D.3 - CA Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
40,196,393
40,196,393
39,251,285
38,303,945
39,868,911
97.65%
95.29%
99.19%
39,251,285
38,303,945
39,868,911
40,196,393
40,196,393
33,994,057
32,118,835
35,664,557
84.57%
79.90%
88.73%
33,994,057
32,118,835
35,664,557
40,196,393
40,196,393
19,061,347
16,864,090
21,455,362
47.42%
41.95%
53.38%
19,061,347
16,864,090
21,455,362
40,196,393
40,196,393
11,253,224
9,679,599
13,243,607
28.00%
24.08%
32.95%
11,253,224
9,679,599
13,243,607
40,196,393
40,196,393
4,063,614
3,320,393
5,007,246
10.11%
8.26%
12.46%
4,063,614
3,320,393
5,007,246
40,196,393
40,196,393
487,860
311,295
714,503
1.21%
0.77%
1.78%
487,860
311,295
714,503
40,196,393
40,196,393
166,115
96,407
267,656
0.41%
0.24%
0.67%
166,115
96,407
267,656
40,196,393
40,196,393
34,816
9,777
71,385
0.09%
0.02%
0.18%
34,816
9,777
71,385
40,196,393
40,196,393
855
50
2,875
0.00%
0.00%
0.01%
855
50
2,875
30,089,884
30,089,884
29,590,098
29,050,931
29,930,898
98.34%
96.55%
99.47%
29,590,098
29,050,931
29,930,898
30,089,884
30,089,884
25,994,395
24,892,193
27,013,043
86.39%
82.73%
89.77%
25,994,395
24,892,193
27,013,043
30,089,884
30,089,884
14,953,312
13,818,310
16,098,060
49.70%
45.92%
53.50%
14,953,312
13,818,310
16,098,060
30,089,884
30,089,884
9,078,435
8,163,539
10,042,549
30.17%
27.13%
33.38%
9,078,435
8,163,539
10,042,549
30,089,884
30,089,884
3,563,213
3,035,499
4,114,122
11.84%
10.09%
13.67%
3,563,213
3,035,499
4,114,122
30,089,884
30,089,884
477,306
308,094
687,921
1.59%
1.02%
2.29%
477,306
308,094
687,921
30,089,884
30,089,884
165,102
96,206
264,666
0.55%
0.32%
0.88%
165,102
96,206
264,666
30,089,884
30,089,884
34,792
9,774
71,296
0.12%
0.03%
0.24%
34,792
9,774
71,296
30,089,884
30,089,884
855
50
2,875
0.00%
0.00%
0.01%
855
50
2,875
5,268,728
5,268,728
4,910,586
4,663,776
5,103,857
93.20%
88.52%
96.87%
4,910,586
4,663,776
5,103,857
5,268,728
5,268,728
3,874,319
3,326,331
4,287,141
73.53%
63.13%
81.37%
3,874,319
3,326,331
4,287,141
5,268,728
5,268,728
1,522,481
666,784
2,546,659
28.90%
12.66%
48.34%
1,522,481
666,784
2,546,659
5,268,728
5,268,728
595,317
181,485
1,374,740
11.30%
3.44%
26.09%
595,317
181,485
1,374,740
5,268,728
5,268,728
95,932
14,382
315,799
1.82%
0.27%
5.99%
95,932
14,382
315,799
5,268,728
5,268,728
1,514
48
5,840
0.03%
0.00%
0.11%
1,514
48
5,840
5,268,728
5,268,728
128
2
483
0.00%
0.00%
0.01%
128
2
483
5,268,728
5,268,728
3
0
9
0.00%
0.00%
0.00%
3
0
9
5,268,728
5,268,728
0
0
0
0.00%
0.00%
0.00%
0
0
0
4,837,781
4,837,781
4,750,602
4,589,238
4,834,156
98.20%
94.86%
99.93%
4,750,602
4,589,238
4,834,156
4,837,781
4,837,781
4,125,342
3,900,312
4,364,373
85.27%
80.62%
90.21%
4,125,342
3,900,312
4,364,373
4,837,781
4,837,781
2,585,554
2,378,996
2,810,643
53.45%
49.18%
58.10%
2,585,554
2,378,996
2,810,643
4,837,781
4,837,781
1,579,472
1,334,574
1,826,318
32.65%
27.59%
37.75%
1,579,472
1,334,574
1,826,318
4,837,781
4,837,781
404,469
270,511
577,325
8.36%
5.59%
11.93%
404,469
270,511
577,325
4,837,781
4,837,781
9,040
3,153
20,742
0.19%
0.07%
0.43%
9,040
3,153
20,742
4,837,781
4,837,781
885
199
2,506
0.02%
0.00%
0.05%
885
199
2,506
4,837,781
4,837,781
22
2
80
0.00%
0.00%
0.00%
22
2
80
4,837,781
4,837,781
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 24 of 58
December 2016

-------
D.3 - CA Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
Threshold - National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation


Systems
Exceeding
Threshold
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
204
1,412
193
183
199
94.41%
89.87%
97.55%
1,317
1,136
1,386

2
204
1,412
157
148
168
77.10%
72.38%
82.18%
1,027
871
1,206

6
204
1,412
94
85
102
45.94%
41.88%
50.16%
562
432
719

10
204
1,412
62
55
69
30.47%
27.14%
33.98%
381
303
497
All Systems
20
204
1,412
29
25
34
14.30%
12.11%
16.74%
221
188
274

60
204
1,412
7
5
9
3.56%
2.68%
4.56%
115
101
129

100
204
1,412
4
2
5
1.85%
1.18%
2.50%
88
61
104

200
204
1,412
1
0
2
0.63%
0.18%
1.20%
43
12
78

600
204
1,412
0
0
0
0.03%
0.00%
0.11%
3
0
11

0.6
128
392
125
122
127
97.62%
95.06%
99.31%
385
373
391

2
128
392
108
104
112
84.37%
81.07%
87.88%
337
322
354

6
128
392
68
64
72
53.27%
50.00%
56.51%
228
212
244
Surface Water
Systems
10
128
392
47
43
51
36.80%
33.93%
39.61%
170
156
185
20
128
392
24
21
27
19.01%
16.71%
21.27%
103
91
116
60
128
392
6
4
8
4.80%
3.51%
6.20%
33
24
43

100
128
392
3
2
4
2.24%
1.39%
3.15%
16
10
22

200
128
392
1
0
2
0.63%
0.18%
1.25%
5
1
9

600
128
392
0
0
0
0.02%
0.00%
0.07%
0
0
1

0.6
41
665
33
29
37
81.08%
69.81%
90.02%
583
453
640

2
41
665
19
16
23
47.02%
38.24%
56.78%
394
296
511

6
41
665
7
4
9
16.26%
10.75%
22.33%
143
57
244
Ground Water
Systems
10
41
665
3
1
5
6.97%
3.53%
11.34%
60
14
135
20
41
665
1
0
1
1.42%
0.40%
3.30%
11
1
36
60
41
665
0
0
0
0.04%
0.00%
0.15%
0
0
1

100
41
665
0
0
0
0.01%
0.00%
0.02%
0
0
0

200
41
665
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
41
665
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
35
355
34
33
35
98.28%
94.38%
99.93%
348
311
355

2
35
355
30
28
32
85.75%
80.59%
91.07%
296
253
340

6
35
355
19
17
21
53.93%
48.68%
59.54%
192
162
230
Mixed Water
Systems
10
35
355
12
10
14
34.81%
29.97%
39.87%
151
133
176
20
35
355
4
3
6
12.16%
9.02%
15.92%
107
96
121
60
35
355
1
1
1
3.16%
2.78%
3.72%
81
76
85

100
35
355
1
1
1
2.60%
1.80%
2.99%
72
51
81

200
35
355
0
0
1
1.36%
0.39%
2.44%
38
11
69

600
35
355
0
0
0
0.10%
0.00%
0.38%
3
0
11
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 25 of 58
December 2016

-------
D.3 - CA Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
43,249,513
54,813,206
42,002,409
40,861,457
42,768,144
97.12%
94.48%
98.89%
52,624,652
50,688,806
53,882,813
43,249,513
54,813,206
36,038,680
33,972,891
37,915,417
83.33%
78.55%
87.67%
44,369,222
41,555,493
47,073,546
43,249,513
54,813,206
20,240,597
17,902,223
22,792,901
46.80%
41.39%
52.70%
25,492,195
22,447,568
28,826,464
43,249,513
54,813,206
12,077,085
10,383,909
14,199,722
27.92%
24.01%
32.83%
15,780,801
13,439,061
18,669,684
43,249,513
54,813,206
4,475,693
3,648,063
5,518,281
10.35%
8.43%
12.76%
6,239,193
4,976,520
7,818,483
43,249,513
54,813,206
569,008
358,080
841,704
1.32%
0.83%
1.95%
938,729
599,365
1,397,736
43,249,513
54,813,206
195,532
110,827
319,906
0.45%
0.26%
0.74%
378,250
219,622
591,304
43,249,513
54,813,206
41,359
11,541
85,019
0.10%
0.03%
0.20%
108,433
30,594
211,049
43,249,513
54,813,206
1,118
64
3,796
0.00%
0.00%
0.01%
5,361
254
19,203
31,753,817
36,529,231
31,218,259
30,629,461
31,591,228
98.31%
96.46%
99.49%
35,892,858
35,162,090
36,356,544
31,753,817
36,529,231
27,338,316
26,147,813
28,449,663
86.09%
82.35%
89.59%
31,212,053
29,769,995
32,586,533
31,753,817
36,529,231
15,760,204
14,559,724
16,982,115
49.63%
45.85%
53.48%
18,109,175
16,717,097
19,555,875
31,753,817
36,529,231
9,669,180
8,700,197
10,688,955
30.45%
27.40%
33.66%
11,399,338
10,271,560
12,582,983
31,753,817
36,529,231
3,893,517
3,317,489
4,495,250
12.26%
10.45%
14.16%
4,877,178
4,158,726
5,627,658
31,753,817
36,529,231
551,047
351,134
799,595
1.74%
1.11%
2.52%
784,713
492,506
1,146,637
31,753,817
36,529,231
190,978
108,525
311,400
0.60%
0.34%
0.98%
279,396
154,533
463,291
31,753,817
36,529,231
39,756
11,096
82,045
0.13%
0.03%
0.26%
59,431
16,674
122,628
31,753,817
36,529,231
1,000
59
3,360
0.00%
0.00%
0.01%
1,647
100
5,518
6,374,596
9,969,990
5,750,895
5,363,860
6,059,441
90.22%
84.14%
95.06%
8,525,906
7,600,183
9,215,912
6,374,596
9,969,990
4,298,069
3,654,839
4,819,303
67.42%
57.33%
75.60%
5,740,544
4,754,168
6,685,389
6,374,596
9,969,990
1,659,347
757,636
2,736,734
26.03%
11.89%
42.93%
2,128,221
1,042,514
3,427,485
6,374,596
9,969,990
657,413
216,096
1,469,805
10.31%
3.39%
23.06%
866,326
320,947
1,826,258
6,374,596
9,969,990
110,203
18,727
344,990
1.73%
0.29%
5.41%
156,646
31,607
448,751
6,374,596
9,969,990
1,992
85
7,484
0.03%
0.00%
0.12%
3,472
192
12,679
6,374,596
9,969,990
192
4
732
0.00%
0.00%
0.01%
385
10
1,489
6,374,596
9,969,990
5
0
18
0.00%
0.00%
0.00%
13
0
43
6,374,596
9,969,990
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,121,100
8,313,985
5,033,255
4,868,136
5,117,475
98.28%
95.06%
99.93%
8,205,888
7,926,533
8,310,358
5,121,100
8,313,985
4,402,295
4,170,239
4,646,452
85.96%
81.43%
90.73%
7,416,626
7,031,330
7,801,623
5,121,100
8,313,985
2,821,046
2,584,863
3,074,051
55.09%
50.47%
60.03%
5,254,798
4,687,957
5,843,104
5,121,100
8,313,985
1,750,492
1,467,616
2,040,962
34.18%
28.66%
39.85%
3,515,137
2,846,553
4,260,443
5,121,100
8,313,985
471,973
311,847
678,041
9.22%
6.09%
13.24%
1,205,369
786,188
1,742,075
5,121,100
8,313,985
15,969
6,861
34,625
0.31%
0.13%
0.68%
150,543
106,666
238,421
5,121,100
8,313,985
4,362
2,298
7,775
0.09%
0.04%
0.15%
98,470
65,079
126,524
5,121,100
8,313,985
1,598
446
2,957
0.03%
0.01%
0.06%
48,989
13,920
88,378
5,121,100
8,313,985
118
5
436
0.00%
0.00%
0.01%
3,714
154
13,685
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 26 of 58
December 2016

-------
D.4 - CA with CL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
25
1,252
24
22
25
83.64%
70.38%
96.36%
1,047
881
1,206
2
25
1,252
21
19
22
64.69%
55.98%
75.16%
810
701
941
6
25
1,252
16
14
17
49.50%
45.46%
54.49%
620
569
682
10
25
1,252
12
11
14
38.77%
33.97%
44.05%
485
425
551
20
25
1,252
7
5
8
21.46%
16.88%
26.22%
269
211
328
60
25
1,252
2
1
2
2.94%
1.52%
4.80%
37
19
60
100
25
1,252
1
0
1
0.83%
0.30%
1.66%
10
4
21
200
25
1,252
0
0
0
0.10%
0.02%
0.27%
1
0
3
600
25
1,252
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
14
125
14
13
14
98.79%
94.08%
99.99%
124
118
125
2
14
125
12
12
13
88.75%
82.87%
94.51%
111
104
118
6
14
125
9
8
10
63.89%
58.53%
69.04%
80
73
86
10
14
125
7
6
8
48.14%
42.66%
53.76%
60
53
67
20
14
125
4
3
5
26.93%
22.25%
32.36%
34
28
41
60
14
125
2
1
2
10.76%
7.53%
13.59%
13
9
17
100
14
125
1
0
1
4.84%
2.06%
7.97%
6
3
10
200
14
125
0
0
0
0.79%
0.16%
1.98%
1
0
2
600
14
125
0
0
0
0.01%
0.00%
0.04%
0
0
0
Ground Water
Systems
0.6
3
482
2
1
3
57.80%
24.60%
90.53%
278
118
436
2
3
482
0
0
1
14.86%
0.82%
37.03%
72
4
178
6
3
482
0
0
0
1.19%
0.00%
4.65%
6
0
22
10
3
482
0
0
0
0.23%
0.00%
0.98%
1
0
5
20
3
482
0
0
0
0.02%
0.00%
0.07%
0
0
0
60
3
482
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
3
482
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
3
482
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
3
482
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
8
645
8
8
8
99.99%
99.95%
100.00%
645
645
645
2
8
645
8
7
8
97.22%
91.94%
99.88%
627
593
644
6
8
645
7
6
7
82.77%
76.87%
88.87%
534
496
573
10
8
645
5
5
6
65.73%
57.65%
74.33%
424
372
479
20
8
645
3
2
4
36.41%
28.44%
44.56%
235
183
287
60
8
645
0
0
1
3.62%
1.48%
6.68%
23
10
43
100
8
645
0
0
0
0.66%
0.18%
1.68%
4
1
11
200
8
645
0
0
0
0.04%
0.01%
0.14%
0
0
1
600
8
645
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 27 of 58
December 2016

-------
D.4 - CA with CL-OT
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
112,710
2,356,537
108,362
101,024
112,291
92.89%
84.07%
99.18%
2,188,918
1,981,098
2,337,235
112,710
2,356,537
96,716
88,749
104,567
81.68%
73.90%
89.77%
1,924,870
1,741,445
2,115,400
112,710
2,356,537
74,483
68,179
80,703
64.42%
58.59%
70.88%
1,517,974
1,380,747
1,670,376
112,710
2,356,537
56,082
46,709
65,159
47.92%
38.90%
56.81%
1,129,280
916,623
1,338,679
112,710
2,356,537
28,710
21,578
37,739
23.24%
16.40%
31.47%
547,653
386,430
741,657
112,710
2,356,537
7,610
4,567
10,650
3.02%
1.51%
5.12%
71,248
35,693
120,751
112,710
2,356,537
2,920
1,207
5,353
0.85%
0.31%
1.73%
20,089
7,309
40,653
112,710
2,356,537
399
84
959
0.10%
0.02%
0.24%
2,267
448
5,682
112,710
2,356,537
4
0
14
0.00%
0.00%
0.00%
22
1
75
65,078
317,258
64,257
61,064
65,075
98.74%
93.83%
100.00%
313,257
297,690
317,245
65,078
317,258
57,736
53,508
61,792
88.72%
82.22%
94.95%
281,470
260,854
301,241
65,078
317,258
43,394
39,945
46,374
66.68%
61.38%
71.26%
211,549
194,734
226,076
65,078
317,258
33,035
28,155
37,673
50.76%
43.26%
57.89%
161,049
137,260
183,661
65,078
317,258
17,731
14,003
22,721
27.25%
21.52%
34.91%
86,439
68,268
110,765
65,078
317,258
6,690
4,205
8,796
10.28%
6.46%
13.52%
32,616
20,502
42,880
65,078
317,258
2,762
1,168
4,961
4.24%
1.80%
7.62%
13,465
5,696
24,183
65,078
317,258
391
83
932
0.60%
0.13%
1.43%
1,905
404
4,544
65,078
317,258
4
0
14
0.01%
0.00%
0.02%
21
1
70
8,741
405,603
5,221
1,091
8,325
59.73%
12.49%
95.24%
242,251
50,641
386,315
8,741
405,603
1,366
46
3,940
15.63%
0.53%
45.07%
63,376
2,147
182,823
8,741
405,603
109
0
511
1.24%
0.00%
5.85%
5,043
11
23,711
8,741
405,603
21
0
96
0.24%
0.00%
1.10%
983
0
4,471
8,741
405,603
1
0
5
0.02%
0.00%
0.06%
66
0
245
8,741
405,603
0
0
0
0.00%
0.00%
0.00%
0
0
1
8,741
405,603
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,741
405,603
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,741
405,603
0
0
0
0.00%
0.00%
0.00%
0
0
0
38,891
1,633,675
38,885
38,869
38,891
99.98%
99.94%
100.00%
1,633,411
1,632,766
1,633,675
38,891
1,633,675
37,614
35,196
38,835
96.72%
90.50%
99.86%
1,580,024
1,478,444
1,631,336
38,891
1,633,675
30,980
28,234
33,818
79.66%
72.60%
86.96%
1,301,382
1,186,002
1,420,589
38,891
1,633,675
23,026
18,553
27,390
59.21%
47.71%
70.43%
967,248
779,362
1,150,547
38,891
1,633,675
10,978
7,574
15,013
28.23%
19.48%
38.60%
461,148
318,162
630,647
38,891
1,633,675
920
362
1,854
2.36%
0.93%
4.77%
38,631
15,192
77,870
38,891
1,633,675
158
38
392
0.41%
0.10%
1.01%
6,623
1,613
16,469
38,891
1,633,675
9
1
27
0.02%
0.00%
0.07%
362
44
1,139
38,891
1,633,675
0
0
0
0.00%
0.00%
0.00%
1
0
5
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 28 of 58
December 2016

-------
D.4 - CA with CL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2
National
Number of
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation

Systems
Systems
Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)

0.6
9
149
8
6
9
93.45%
77.77%
99.96%
139
116
148

2
9
149
6
4
8
70.46%
57.71%
86.64%
105
86
129

6
9
149
2
2
3
32.52%
24.43%
41.44%
48
36
62

10
9
149
1
1
2
15.09%
7.78%
22.69%
22
12
34
All Systems
20
9
149
0
0
0
2.73%
0.69%
6.45%
4
1
10

60
9
149
0
0
0
0.05%
0.00%
0.17%
0
0
0

100
9
149
0
0
0
0.00%
0.00%
0.02%
0
0
0

200
9
149
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
9
149
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
2
12
2
1
2
91.61%
59.68%
100.00%
11
7
12

2
2
12
1
0
2
48.98%
17.98%
82.00%
6
2
10

6
2
12
0
0
0
6.02%
0.33%
17.79%
1
0
2
Surface Water
Systems
10
2
12
0
0
0
1.19%
0.02%
4.42%
0
0
1
20
2
12
0
0
0
0.07%
0.00%
0.28%
0
0
0
60
2
12
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
2
12
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
2
12
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
2
12
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
8
1
0
1
56.51%
1.03%
99.37%
4
0
8

2
1
8
0
0
1
13.95%
0.00%
56.79%
1
0
4

6
1
8
0
0
0
1.18%
0.00%
5.87%
0
0
0
Ground Water
Systems
10
1
8
0
0
0
0.26%
0.00%
1.07%
0
0
0
20
1
8
0
0
0
0.02%
0.00%
0.04%
0
0
0
60
1
8
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
8
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
8
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
8
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
6
128
6
5
6
95.90%
84.21%
99.99%
123
108
128

2
6
128
5
4
5
75.98%
65.04%
88.92%
98
84
114

6
6
128
2
2
3
36.97%
28.22%
45.88%
47
36
59
Mixed Water
Systems
10
6
128
1
1
2
17.33%
9.00%
25.76%
22
12
33
20
6
128
0
0
0
3.15%
0.80%
7.43%
4
1
10
60
6
128
0
0
0
0.05%
0.00%
0.20%
0
0
0

100
6
128
0
0
0
0.01%
0.00%
0.02%
0
0
0

200
6
128
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
6
128
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 29 of 58
December 2016

-------
D.4 - CA with CL-OT
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
369,899
4,908,058
332,459
253,734
369,557
94.20%
79.07%
99.97%
4,623,220
3,880,769
4,906,545
369,899
4,908,058
237,452
184,495
310,964
73.48%
61.92%
88.17%
3,606,362
3,039,200
4,327,397
369,899
4,908,058
111,185
81,833
144,891
37.97%
28.77%
47.16%
1,863,762
1,412,209
2,314,652
369,899
4,908,058
53,400
26,421
81,057
18.57%
9.30%
27.63%
911,438
456,628
1,356,311
369,899
4,908,058
9,919
2,322
23,605
3.48%
0.82%
8.26%
170,751
40,142
405,461
369,899
4,908,058
172
10
635
0.06%
0.00%
0.22%
2,967
172
10,974
369,899
4,908,058
16
0
63
0.01%
0.00%
0.02%
276
7
1,089
369,899
4,908,058
0
0
1
0.00%
0.00%
0.00%
7
0
24
369,899
4,908,058
0
0
0
0.00%
0.00%
0.00%
0
0
0
69,623
408,139
64,234
43,684
69,620
92.26%
62.74%
100.00%
376,546
256,082
408,124
69,623
408,139
35,239
13,190
57,428
50.61%
18.94%
82.48%
206,575
77,320
336,650
69,623
408,139
4,421
237
13,118
6.35%
0.34%
18.84%
25,914
1,388
76,898
69,623
408,139
882
16
3,305
1.27%
0.02%
4.75%
5,173
96
19,375
69,623
408,139
52
0
208
0.08%
0.00%
0.30%
307
1
1,220
69,623
408,139
0
0
0
0.00%
0.00%
0.00%
1
0
3
69,623
408,139
0
0
0
0.00%
0.00%
0.00%
0
0
0
69,623
408,139
0
0
0
0.00%
0.00%
0.00%
0
0
0
69,623
408,139
0
0
0
0.00%
0.00%
0.00%
0
0
0
51,848
204,555
29,298
532
51,520
56.51%
1.03%
99.37%
115,590
2,101
203,262
51,848
204,555
7,232
1
29,445
13.95%
0.00%
56.79%
28,532
6
116,169
51,848
204,555
609
0
3,045
1.18%
0.00%
5.87%
2,404
0
12,013
51,848
204,555
132
0
555
0.26%
0.00%
1.07%
523
0
2,188
51,848
204,555
11
0
22
0.02%
0.00%
0.04%
43
0
86
51,848
204,555
0
0
0
0.00%
0.00%
0.00%
0
0
0
51,848
204,555
0
0
0
0.00%
0.00%
0.00%
0
0
0
51,848
204,555
0
0
0
0.00%
0.00%
0.00%
0
0
0
51,848
204,555
0
0
0
0.00%
0.00%
0.00%
0
0
0
248,428
4,295,363
238,927
209,517
248,416
96.18%
84.34%
100.00%
4,131,083
3,622,586
4,295,158
248,428
4,295,363
194,981
171,304
224,091
78.49%
68.96%
90.20%
3,371,254
2,961,873
3,874,578
248,428
4,295,363
106,155
81,597
128,729
42.73%
32.85%
51.82%
1,835,445
1,410,821
2,225,740
248,428
4,295,363
52,385
26,404
77,197
21.09%
10.63%
31.07%
905,743
456,532
1,334,748
248,428
4,295,363
9,855
2,322
23,375
3.97%
0.93%
9.41%
170,401
40,141
404,154
248,428
4,295,363
172
10
635
0.07%
0.00%
0.26%
2,966
172
10,971
248,428
4,295,363
16
0
63
0.01%
0.00%
0.03%
276
7
1,089
248,428
4,295,363
0
0
1
0.00%
0.00%
0.00%
7
0
24
248,428
4,295,363
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 30 of 58
December 2016

-------
D.4 - CA with CL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All Systems
0.6
45
45
42
38
44
92.26%
84.59%
98.54%
42
38
44
2
45
45
30
26
33
65.78%
57.97%
73.86%
30
26
33
6
45
45
15
13
17
33.34%
29.07%
38.20%
15
13
17
10
45
45
9
7
10
19.16%
15.78%
22.91%
9
7
10
20
45
45
3
2
4
6.74%
4.85%
8.77%
3
2
4
60
45
45
1
1
1
2.18%
1.82%
2.60%
1
1
1
100
45
45
0
0
1
0.93%
0.52%
1.46%
0
0
1
200
45
45
0
0
0
0.09%
0.03%
0.21%
0
0
0
600
45
45
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
17
17
16
14
17
91.32%
83.91%
97.93%
16
14
17
2
17
17
11
10
12
65.26%
57.94%
73.07%
11
10
12
6
17
17
5
4
6
31.12%
25.72%
36.54%
5
4
6
10
17
17
3
2
4
16.46%
12.67%
21.47%
3
2
4
20
17
17
1
0
1
5.27%
2.83%
7.79%
1
0
1
60
17
17
0
0
0
0.31%
0.04%
0.95%
0
0
0
100
17
17
0
0
0
0.05%
0.00%
0.17%
0
0
0
200
17
17
0
0
0
0.00%
0.00%
0.01%
0
0
0
600
17
17
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
4
4
3
2
4
78.43%
54.98%
96.96%
3
2
4
2
4
4
1
0
2
30.03%
11.02%
50.47%
1
0
2
6
4
4
0
0
0
2.76%
0.19%
9.43%
0
0
0
10
4
4
0
0
0
0.54%
0.01%
2.07%
0
0
0
20
4
4
0
0
0
0.04%
0.00%
0.16%
0
0
0
60
4
4
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
4
4
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
4
4
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
4
4
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
24
24
23
22
24
95.23%
90.00%
99.23%
23
22
24
2
24
24
17
16
19
72.10%
65.82%
78.31%
17
16
19
6
24
24
10
9
11
40.00%
36.25%
44.17%
10
9
11
10
24
24
6
5
7
24.17%
20.62%
27.41%
6
5
7
20
24
24
2
2
3
8.91%
7.09%
10.90%
2
2
3
60
24
24
1
1
1
3.87%
3.39%
4.20%
1
1
1
100
24
24
0
0
1
1.70%
0.96%
2.61%
0
0
1
200
24
24
0
0
0
0.16%
0.05%
0.38%
0
0
0
600
24
24
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 31 of 58
December 2016

-------
D.4 - CA with CL-OT
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
21,363,993
21,363,993
20,086,523
18,728,162
21,177,392
94.02%
87.66%
99.13%
20,086,523
18,728,162
21,177,392
21,363,993
21,363,993
15,858,998
14,401,554
17,468,699
74.23%
67.41%
81.77%
15,858,998
14,401,554
17,468,699
21,363,993
21,363,993
8,965,133
7,358,321
11,043,614
41.96%
34.44%
51.69%
8,965,133
7,358,321
11,043,614
21,363,993
21,363,993
5,535,346
4,555,563
6,993,427
25.91%
21.32%
32.73%
5,535,346
4,555,563
6,993,427
21,363,993
21,363,993
3,231,490
2,984,725
3,653,539
15.13%
13.97%
17.10%
3,231,490
2,984,725
3,653,539
21,363,993
21,363,993
2,463,713
2,148,475
2,675,756
11.53%
10.06%
12.52%
2,463,713
2,148,475
2,675,756
21,363,993
21,363,993
1,100,703
622,475
1,691,642
5.15%
2.91%
7.92%
1,100,703
622,475
1,691,642
21,363,993
21,363,993
104,122
32,131
245,103
0.49%
0.15%
1.15%
104,122
32,131
245,103
21,363,993
21,363,993
481
47
1,690
0.00%
0.00%
0.01%
481
47
1,690
9,764,629
9,764,629
9,022,545
8,328,288
9,650,080
92.40%
85.29%
98.83%
9,022,545
8,328,288
9,650,080
9,764,629
9,764,629
6,829,443
5,972,440
7,708,277
69.94%
61.16%
78.94%
6,829,443
5,972,440
7,708,277
9,764,629
9,764,629
2,853,358
1,741,225
4,431,472
29.22%
17.83%
45.38%
2,853,358
1,741,225
4,431,472
9,764,629
9,764,629
1,196,825
626,068
2,206,030
12.26%
6.41%
22.59%
1,196,825
626,068
2,206,030
9,764,629
9,764,629
223,197
103,736
468,576
2.29%
1.06%
4.80%
223,197
103,736
468,576
9,764,629
9,764,629
6,969
1,155
20,140
0.07%
0.01%
0.21%
6,969
1,155
20,140
9,764,629
9,764,629
950
78
3,181
0.01%
0.00%
0.03%
950
78
3,181
9,764,629
9,764,629
41
1
173
0.00%
0.00%
0.00%
41
1
173
9,764,629
9,764,629
0
0
0
0.00%
0.00%
0.00%
0
0
0
560,393
560,393
433,552
281,574
542,949
77.37%
50.25%
96.89%
433,552
281,574
542,949
560,393
560,393
158,441
56,835
287,620
28.27%
10.14%
51.32%
158,441
56,835
287,620
560,393
560,393
14,380
1,052
46,406
2.57%
0.19%
8.28%
14,380
1,052
46,406
560,393
560,393
2,831
75
11,370
0.51%
0.01%
2.03%
2,831
75
11,370
560,393
560,393
201
1
854
0.04%
0.00%
0.15%
201
1
854
560,393
560,393
1
0
3
0.00%
0.00%
0.00%
1
0
3
560,393
560,393
0
0
0
0.00%
0.00%
0.00%
0
0
0
560,393
560,393
0
0
0
0.00%
0.00%
0.00%
0
0
0
560,393
560,393
0
0
0
0.00%
0.00%
0.00%
0
0
0
11,038,971
11,038,971
10,630,427
10,118,300
10,984,363
96.30%
91.66%
99.51%
10,630,427
10,118,300
10,984,363
11,038,971
11,038,971
8,871,114
8,372,279
9,472,802
80.36%
75.84%
85.81%
8,871,114
8,372,279
9,472,802
11,038,971
11,038,971
6,097,395
5,616,044
6,565,736
55.24%
50.87%
59.48%
6,097,395
5,616,044
6,565,736
11,038,971
11,038,971
4,335,690
3,929,420
4,776,026
39.28%
35.60%
43.27%
4,335,690
3,929,420
4,776,026
11,038,971
11,038,971
3,008,092
2,880,988
3,184,109
27.25%
26.10%
28.84%
3,008,092
2,880,988
3,184,109
11,038,971
11,038,971
2,456,742
2,147,319
2,655,613
22.26%
19.45%
24.06%
2,456,742
2,147,319
2,655,613
11,038,971
11,038,971
1,099,753
622,397
1,688,460
9.96%
5.64%
15.30%
1,099,753
622,397
1,688,460
11,038,971
11,038,971
104,081
32,130
244,929
0.94%
0.29%
2.22%
104,081
32,130
244,929
11,038,971
11,038,971
481
47
1,690
0.00%
0.00%
0.02%
481
47
1,690
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 32 of 58
December 2016

-------
D.4 - CA with CL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All Systems
0.6
79
1,445
73
66
78
92.70%
83.83%
98.80%
1,227
1,034
1,399
2
79
1,445
56
49
63
70.79%
62.44%
79.89%
944
812
1,103
6
79
1,445
33
29
37
41.71%
36.86%
47.18%
683
618
761
10
79
1,445
22
18
25
27.46%
23.07%
32.23%
516
444
595
20
79
1,445
10
8
12
12.54%
9.65%
15.82%
276
214
342
60
79
1,445
3
2
4
3.52%
2.52%
4.58%
38
20
62
100
79
1,445
1
1
2
1.45%
0.68%
2.41%
11
4
21
200
79
1,445
0
0
0
0.19%
0.04%
0.48%
1
0
3
600
79
1,445
0
0
0
0.00%
0.00%
0.01%
0
0
0
Surface Water
Systems
0.6
33
154
31
29
33
94.51%
86.75%
98.93%
150
139
154
2
33
154
24
22
27
74.24%
66.09%
82.71%
128
116
141
6
33
154
14
13
16
43.50%
38.10%
49.19%
86
78
95
10
33
154
10
8
11
28.97%
24.63%
34.14%
63
56
72
20
33
154
5
4
6
14.14%
10.89%
17.76%
35
28
42
60
33
154
2
1
2
4.72%
3.22%
6.26%
14
9
17
100
33
154
1
0
1
2.08%
0.88%
3.47%
6
3
10
200
33
154
0
0
0
0.34%
0.07%
0.85%
1
0
2
600
33
154
0
0
0
0.00%
0.00%
0.02%
0
0
0
Ground Water
Systems
0.6
8
493
5
3
8
67.95%
36.84%
94.85%
286
121
448
2
8
493
2
0
4
22.33%
5.82%
46.22%
74
4
185
6
8
493
0
0
1
1.97%
0.10%
7.19%
6
0
23
10
8
493
0
0
0
0.39%
0.01%
1.53%
1
0
5
20
8
493
0
0
0
0.03%
0.00%
0.11%
0
0
0
60
8
493
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
8
493
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
8
493
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
8
493
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
38
797
37
35
38
96.34%
91.18%
99.51%
791
774
797
2
38
797
30
27
32
78.00%
71.19%
84.52%
742
692
777
6
38
797
18
17
20
48.53%
43.53%
53.85%
591
541
643
10
38
797
12
10
14
31.84%
26.58%
37.03%
452
388
519
20
38
797
5
4
7
13.79%
10.59%
17.44%
241
186
300
60
38
797
1
1
2
3.22%
2.45%
4.09%
24
10
44
100
38
797
0
0
1
1.22%
0.65%
2.00%
5
1
11
200
38
797
0
0
0
0.11%
0.03%
0.27%
0
0
1
600
38
797
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 33 of 58
December 2016

-------
D.4 - CA with CL-OT
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
21,846,602
28,628,587
20,527,344
19,082,920
21,659,240
93.96%
87.35%
99.14%
26,898,662
24,590,028
28,421,172
21,846,602
28,628,587
16,193,166
14,674,798
17,884,230
74.12%
67.17%
81.86%
21,390,230
19,182,198
23,911,496
21,846,602
28,628,587
9,150,801
7,508,333
11,269,208
41.89%
34.37%
51.58%
12,346,869
10,151,277
15,028,641
21,846,602
28,628,587
5,644,828
4,628,693
7,139,643
25.84%
21.19%
32.68%
7,576,064
5,928,814
9,688,417
21,846,602
28,628,587
3,270,119
3,008,624
3,714,883
14.97%
13.77%
17.00%
3,949,894
3,411,297
4,800,657
21,846,602
28,628,587
2,471,494
2,153,052
2,687,040
11.31%
9.86%
12.30%
2,537,927
2,184,339
2,807,481
21,846,602
28,628,587
1,103,639
623,682
1,697,057
5.05%
2.85%
7.77%
1,121,067
629,791
1,733,383
21,846,602
28,628,587
104,522
32,214
246,063
0.48%
0.15%
1.13%
106,395
32,579
250,809
21,846,602
28,628,587
486
48
1,705
0.00%
0.00%
0.01%
504
49
1,765
9,899,330
10,490,027
9,151,035
8,433,036
9,784,775
92.44%
85.19%
98.84%
9,712,348
8,882,061
10,375,450
9,899,330
10,490,027
6,922,419
6,039,138
7,827,497
69.93%
61.01%
79.07%
7,317,489
6,310,615
8,346,168
9,899,330
10,490,027
2,901,173
1,781,407
4,490,963
29.31%
18.00%
45.37%
3,090,821
1,937,346
4,734,445
9,899,330
10,490,027
1,230,743
654,240
2,247,009
12.43%
6.61%
22.70%
1,363,047
763,424
2,409,066
9,899,330
10,490,027
240,980
117,740
491,505
2.43%
1.19%
4.97%
309,944
172,005
580,561
9,899,330
10,490,027
13,660
5,361
28,936
0.14%
0.05%
0.29%
39,587
21,657
63,023
9,899,330
10,490,027
3,712
1,246
8,142
0.04%
0.01%
0.08%
14,415
5,774
27,364
9,899,330
10,490,027
432
84
1,105
0.00%
0.00%
0.01%
1,946
405
4,717
9,899,330
10,490,027
4
0
15
0.00%
0.00%
0.00%
21
1
70
620,982
1,170,551
468,071
283,198
602,794
75.38%
45.60%
97.07%
791,392
334,316
1,132,526
620,982
1,170,551
167,038
56,883
321,005
26.90%
9.16%
51.69%
250,348
58,988
586,611
620,982
1,170,551
15,098
1,052
49,962
2.43%
0.17%
8.05%
21,826
1,063
82,130
620,982
1,170,551
2,984
75
12,021
0.48%
0.01%
1.94%
4,337
76
18,029
620,982
1,170,551
213
1
881
0.03%
0.00%
0.14%
310
1
1,186
620,982
1,170,551
1
0
3
0.00%
0.00%
0.00%
2
0
3
620,982
1,170,551
0
0
0
0.00%
0.00%
0.00%
0
0
0
620,982
1,170,551
0
0
0
0.00%
0.00%
0.00%
0
0
0
620,982
1,170,551
0
0
0
0.00%
0.00%
0.00%
0
0
0
11,326,290
16,968,009
10,908,238
10,366,686
11,271,670
96.31%
91.53%
99.52%
16,394,921
15,373,652
16,913,197
11,326,290
16,968,009
9,103,709
8,578,778
9,735,729
80.38%
75.74%
85.96%
13,822,393
12,812,596
14,978,716
11,326,290
16,968,009
6,234,531
5,725,875
6,728,283
55.04%
50.55%
59.40%
9,234,222
8,212,868
10,212,066
11,326,290
16,968,009
4,411,101
3,974,378
4,880,613
38.95%
35.09%
43.09%
6,208,681
5,165,314
7,261,322
11,326,290
16,968,009
3,028,926
2,890,884
3,222,497
26.74%
25.52%
28.45%
3,639,641
3,239,291
4,218,910
11,326,290
16,968,009
2,457,833
2,147,691
2,658,102
21.70%
18.96%
23.47%
2,498,339
2,162,682
2,744,455
11,326,290
16,968,009
1,099,927
622,436
1,688,915
9.71%
5.50%
14.91%
1,106,652
624,017
1,706,018
11,326,290
16,968,009
104,090
32,131
244,958
0.92%
0.28%
2.16%
104,449
32,174
246,091
11,326,290
16,968,009
481
47
1,690
0.00%
0.00%
0.01%
483
47
1,695
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 34 of 58
December 2016

-------
D.5 - CL with OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
Threshold - National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
1
9
0
0
1
44.73%
0.13%
99.65%
4
0
9
2
1
9
0
0
0
8.62%
0.00%
49.49%
1
0
4
6
1
9
0
0
0
0.39%
0.00%
2.17%
0
0
0
10
1
9
0
0
0
0.05%
0.00%
0.22%
0
0
0
20
1
9
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
1
9
0
0
1
44.73%
0.13%
99.65%
4
0
9
2
1
9
0
0
0
8.62%
0.00%
49.49%
1
0
4
6
1
9
0
0
0
0.39%
0.00%
2.17%
0
0
0
10
1
9
0
0
0
0.05%
0.00%
0.22%
0
0
0
20
1
9
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 35 of 58
December 2016

-------
D.5 - CL with OT
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
9,001
22,661
4,026
12
8,970
44.73%
0.13%
99.65%
10,136
30
22,583
9,001
22,661
776
0
4,455
8.62%
0.00%
49.49%
1,953
0
11,215
9,001
22,661
35
0
196
0.39%
0.00%
2.17%
88
0
492
9,001
22,661
4
0
20
0.05%
0.00%
0.22%
11
0
51
9,001
22,661
0
0
0
0.00%
0.00%
0.01%
0
0
1
9,001
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
9,001
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
9,001
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
9,001
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
9,001
22,661
4,026
12
8,970
44.73%
0.13%
99.65%
10,136
30
22,583
9,001
22,661
776
0
4,455
8.62%
0.00%
49.49%
1,953
0
11,215
9,001
22,661
35
0
196
0.39%
0.00%
2.17%
88
0
492
9,001
22,661
4
0
20
0.05%
0.00%
0.22%
11
0
51
9,001
22,661
0
0
0
0.00%
0.00%
0.01%
0
0
1
9,001
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
9,001
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
9,001
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
9,001
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 36 of 58
December 2016

-------
D.5 - CL with OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
Threshold - National
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation



Threshold
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)

0.6
8
88
4
1
7
50.35%
15.01%
85.83%
45
13
76

2
8
88
2
1
3
16.96%
8.88%
38.44%
15
8
34

6
8
88
0
0
1
4.29%
1.16%
8.82%
4
1
8

10
8
88
0
0
0
1.39%
0.18%
3.58%
1
0
3
All Systems
20
8
88
0
0
0
0.17%
0.01%
0.55%
0
0
0

60
8
88
0
0
0
0.00%
0.00%
0.01%
0
0
0

100
8
88
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
8
88
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
8
88
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
6
1
0
1
60.97%
0.65%
99.98%
4
0
6

2
1
6
0
0
1
13.35%
0.00%
61.46%
1
0
4

6
1
6
0
0
0
0.59%
0.00%
3.79%
0
0
0
Surface Water
Systems
10
1
6
0
0
0
0.07%
0.00%
0.55%
0
0
0
20
1
6
0
0
0
0.00%
0.00%
0.02%
0
0
0
60
1
6
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
6
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
6
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
6
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
5
40
2
1
4
49.15%
26.87%
73.68%
19
11
29

2
5
40
1
1
2
24.77%
19.84%
36.90%
10
8
15

6
5
40
0
0
1
8.85%
2.59%
15.89%
3
1
6
Ground Water
Systems
10
5
40
0
0
0
2.99%
0.39%
7.49%
1
0
3
20
5
40
0
0
0
0.38%
0.02%
1.22%
0
0
0
60
5
40
0
0
0
0.01%
0.00%
0.02%
0
0
0

100
5
40
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
5
40
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
5
40
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
2
43
1
0
2
49.93%
6.11%
95.02%
21
3
41

2
2
43
0
0
1
10.26%
0.03%
36.59%
4
0
16

6
2
43
0
0
0
0.60%
0.00%
3.02%
0
0
1
Mixed Water
Systems
10
2
43
0
0
0
0.10%
0.00%
0.41%
0
0
0
20
2
43
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
2
43
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
2
43
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
2
43
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
2
43
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 37 of 58
December 2016

-------
D.5 - CL with OT
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
331,910
2,658,633
184,205
67,243
291,279
53.17%
18.24%
88.47%
1,413,664
485,060
2,352,052
331,910
2,658,633
78,871
51,341
158,458
20.97%
12.71%
43.21%
557,604
337,891
1,148,738
331,910
2,658,633
24,317
6,544
47,746
6.12%
1.62%
12.26%
162,830
43,035
325,822
331,910
2,658,633
8,083
1,026
20,796
2.02%
0.25%
5.20%
53,679
6,744
138,279
331,910
2,658,633
1,019
43
3,252
0.25%
0.01%
0.81%
6,731
280
21,456
331,910
2,658,633
14
0
41
0.00%
0.00%
0.01%
91
0
269
331,910
2,658,633
1
0
3
0.00%
0.00%
0.00%
9
0
19
331,910
2,658,633
0
0
0
0.00%
0.00%
0.00%
0
0
0
331,910
2,658,633
0
0
0
0.00%
0.00%
0.00%
0
0
0
77,280
204,070
47,117
503
77,267
60.97%
0.65%
99.98%
124,421
1,328
204,035
77,280
204,070
10,318
1
47,493
13.35%
0.00%
61.46%
27,246
1
125,414
77,280
204,070
458
0
2,931
0.59%
0.00%
3.79%
1,209
0
7,739
77,280
204,070
58
0
423
0.07%
0.00%
0.55%
153
0
1,117
77,280
204,070
2
0
12
0.00%
0.00%
0.02%
5
0
33
77,280
204,070
0
0
0
0.00%
0.00%
0.00%
0
0
0
77,280
204,070
0
0
0
0.00%
0.00%
0.00%
0
0
0
77,280
204,070
0
0
0
0.00%
0.00%
0.00%
0
0
0
77,280
204,070
0
0
0
0.00%
0.00%
0.00%
0
0
0
155,528
1,022,776
87,830
61,044
119,920
56.47%
39.25%
77.11%
577,584
401,438
788,617
155,528
1,022,776
58,448
51,307
73,665
37.58%
32.99%
47.36%
384,362
337,401
484,433
155,528
1,022,776
23,259
6,544
41,846
14.95%
4.21%
26.91%
152,955
43,035
275,189
155,528
1,022,776
7,929
1,026
19,967
5.10%
0.66%
12.84%
52,145
6,744
131,309
155,528
1,022,776
1,012
43
3,224
0.65%
0.03%
2.07%
6,658
280
21,199
155,528
1,022,776
14
0
41
0.01%
0.00%
0.03%
91
0
268
155,528
1,022,776
1
0
3
0.00%
0.00%
0.00%
9
0
19
155,528
1,022,776
0
0
0
0.00%
0.00%
0.00%
0
0
0
155,528
1,022,776
0
0
0
0.00%
0.00%
0.00%
0
0
0
99,102
1,431,788
49,258
5,696
94,092
49.70%
5.75%
94.94%
711,659
82,294
1,359,400
99,102
1,431,788
10,105
34
37,300
10.20%
0.03%
37.64%
145,996
489
538,891
99,102
1,431,788
600
0
2,969
0.61%
0.00%
3.00%
8,666
0
42,894
99,102
1,431,788
96
0
405
0.10%
0.00%
0.41%
1,382
0
5,854
99,102
1,431,788
5
0
16
0.00%
0.00%
0.02%
68
0
225
99,102
1,431,788
0
0
0
0.00%
0.00%
0.00%
0
0
0
99,102
1,431,788
0
0
0
0.00%
0.00%
0.00%
0
0
0
99,102
1,431,788
0
0
0
0.00%
0.00%
0.00%
0
0
0
99,102
1,431,788
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 38 of 58
December 2016

-------
D.5 - CL with OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
Threshold - National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All Systems
0.6
13
13
7
4
10
53.70%
27.78%
80.63%
7
4
10
2
13
13
3
1
5
19.60%
10.48%
34.98%
3
1
5
6
13
13
1
0
1
6.00%
2.95%
10.14%
1
0
1
10
13
13
0
0
1
2.17%
0.63%
5.08%
0
0
1
20
13
13
0
0
0
0.27%
0.03%
0.88%
0
0
0
60
13
13
0
0
0
0.00%
0.00%
0.01%
0
0
0
100
13
13
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
13
13
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
13
13
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
6
6
4
2
5
60.38%
37.61%
82.43%
4
2
5
2
6
6
1
0
2
19.06%
5.97%
33.98%
1
0
2
6
6
6
0
0
0
1.62%
0.10%
5.09%
0
0
0
10
6
6
0
0
0
0.29%
0.01%
1.18%
0
0
0
20
6
6
0
0
0
0.02%
0.00%
0.07%
0
0
0
60
6
6
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
6
6
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
6
6
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
6
6
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
4
4
2
0
3
39.25%
8.05%
70.25%
2
0
3
2
4
4
0
0
1
7.04%
0.11%
23.55%
0
0
1
6
4
4
0
0
0
0.37%
0.00%
2.06%
0
0
0
10
4
4
0
0
0
0.06%
0.00%
0.36%
0
0
0
20
4
4
0
0
0
0.00%
0.00%
0.01%
0
0
0
60
4
4
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
4
4
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
4
4
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
4
4
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
3
3
2
1
3
59.60%
34.43%
90.88%
2
1
3
2
3
3
1
1
2
37.45%
33.33%
52.20%
1
1
2
6
3
3
1
0
1
22.25%
12.60%
31.02%
1
0
1
10
3
3
0
0
1
8.74%
2.72%
19.15%
0
0
1
20
3
3
0
0
0
1.12%
0.15%
3.66%
0
0
0
60
3
3
0
0
0
0.01%
0.00%
0.06%
0
0
0
100
3
3
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
3
3
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
3
3
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 39 of 58
December 2016

-------
D.5 - CL with OT
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
9,134,128
9,134,128
5,660,659
890,102
8,629,977
61.97%
9.74%
94.48%
5,660,659
890,102
8,629,977
9,134,128
9,134,128
1,386,774
234,676
5,146,135
15.18%
2.57%
56.34%
1,386,774
234,676
5,146,135
9,134,128
9,134,128
164,187
59,779
391,627
1.80%
0.65%
4.29%
164,187
59,779
391,627
9,134,128
9,134,128
49,566
12,852
118,941
0.54%
0.14%
1.30%
49,566
12,852
118,941
9,134,128
9,134,128
5,648
691
18,578
0.06%
0.01%
0.20%
5,648
691
18,578
9,134,128
9,134,128
63
1
265
0.00%
0.00%
0.00%
63
1
265
9,134,128
9,134,128
5
0
21
0.00%
0.00%
0.00%
5
0
21
9,134,128
9,134,128
0
0
0
0.00%
0.00%
0.00%
0
0
0
9,134,128
9,134,128
0
0
0
0.00%
0.00%
0.00%
0
0
0
7,668,042
7,668,042
4,911,768
661,506
7,399,719
64.06%
8.63%
96.50%
4,911,768
661,506
7,399,719
7,668,042
7,668,042
1,124,048
77,296
4,572,211
14.66%
1.01%
59.63%
1,124,048
77,296
4,572,211
7,668,042
7,668,042
55,537
1,012
223,437
0.72%
0.01%
2.91%
55,537
1,012
223,437
7,668,042
7,668,042
7,911
70
25,662
0.10%
0.00%
0.33%
7,911
70
25,662
7,668,042
7,668,042
338
1
1,189
0.00%
0.00%
0.02%
338
1
1,189
7,668,042
7,668,042
1
0
2
0.00%
0.00%
0.00%
1
0
2
7,668,042
7,668,042
0
0
0
0.00%
0.00%
0.00%
0
0
0
7,668,042
7,668,042
0
0
0
0.00%
0.00%
0.00%
0
0
0
7,668,042
7,668,042
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,151,288
1,151,288
532,310
69,889
936,138
46.24%
6.07%
81.31%
532,310
69,889
936,138
1,151,288
1,151,288
96,974
910
372,704
8.42%
0.08%
32.37%
96,974
910
372,704
1,151,288
1,151,288
4,662
2
23,243
0.40%
0.00%
2.02%
4,662
2
23,243
1,151,288
1,151,288
708
0
3,371
0.06%
0.00%
0.29%
708
0
3,371
1,151,288
1,151,288
35
0
184
0.00%
0.00%
0.02%
35
0
184
1,151,288
1,151,288
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,151,288
1,151,288
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,151,288
1,151,288
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,151,288
1,151,288
0
0
0
0.00%
0.00%
0.00%
0
0
0
314,798
314,798
216,582
158,706
294,120
68.80%
50.42%
93.43%
216,582
158,706
294,120
314,798
314,798
165,752
156,469
201,220
52.65%
49.70%
63.92%
165,752
156,469
201,220
314,798
314,798
103,989
58,765
144,947
33.03%
18.67%
46.04%
103,989
58,765
144,947
314,798
314,798
40,947
12,781
89,908
13.01%
4.06%
28.56%
40,947
12,781
89,908
314,798
314,798
5,276
690
17,206
1.68%
0.22%
5.47%
5,276
690
17,206
314,798
314,798
62
1
262
0.02%
0.00%
0.08%
62
1
262
314,798
314,798
5
0
21
0.00%
0.00%
0.01%
5
0
21
314,798
314,798
0
0
0
0.00%
0.00%
0.00%
0
0
0
314,798
314,798
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 40 of 58
December 2016

-------
D.5 - CL with OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
Threshold - National
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation



Threshold
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
22
110
11
5
18
52.24%
23.11%
82.11%
55
17
95

2
22
110
4
2
8
19.15%
10.70%
37.42%
18
9
43

6
22
110
1
1
2
5.66%
2.33%
10.15%
5
1
9

10
22
110
0
0
1
1.97%
0.46%
4.77%
2
0
4
All Systems
20
22
110
0
0
0
0.24%
0.02%
0.80%
0
0
1

60
22
110
0
0
0
0.00%
0.00%
0.01%
0
0
0

100
22
110
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
22
110
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
22
110
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
8
21
5
2
7
58.50%
28.30%
86.78%
11
2
20

2
8
21
1
0
3
17.04%
4.47%
39.35%
3
0
10

6
8
21
0
0
0
1.34%
0.07%
4.56%
0
0
1
Surface Water
Systems
10
8
21
0
0
0
0.23%
0.00%
0.98%
0
0
0
20
8
21
0
0
0
0.01%
0.00%
0.06%
0
0
0
60
8
21
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
8
21
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
8
21
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
8
21
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
9
44
4
2
6
44.75%
18.50%
72.15%
21
11
32

2
9
44
2
1
3
16.89%
11.07%
30.97%
10
8
16

6
9
44
0
0
1
5.08%
1.44%
9.75%
4
1
6
Ground Water
Systems
10
9
44
0
0
0
1.69%
0.22%
4.32%
1
0
3
20
9
44
0
0
0
0.21%
0.01%
0.68%
0
0
0
60
9
44
0
0
0
0.00%
0.00%
0.01%
0
0
0

100
9
44
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
9
44
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
9
44
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
5
46
3
1
5
55.73%
23.11%
92.54%
23
4
43

2
5
46
1
1
2
26.57%
20.01%
45.95%
6
1
17

6
5
46
1
0
1
13.59%
7.56%
19.82%
1
0
2
Mixed Water
Systems
10
5
46
0
0
1
5.28%
1.63%
11.66%
0
0
1
20
5
46
0
0
0
0.68%
0.09%
2.20%
0
0
0
60
5
46
0
0
0
0.01%
0.00%
0.03%
0
0
0

100
5
46
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
5
46
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
5
46
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 41 of 58
December 2016

-------
D.5 - CL with OT
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
9,475,038
11,815,422
5,848,890
957,357
8,930,226
61.73%
10.10%
94.25%
7,084,459
1,375,191
11,004,611
9,475,038
11,815,422
1,466,420
286,017
5,309,047
15.48%
3.02%
56.03%
1,946,331
572,567
6,306,088
9,475,038
11,815,422
188,539
66,323
439,568
1.99%
0.70%
4.64%
327,105
102,814
717,941
9,475,038
11,815,422
57,653
13,877
139,756
0.61%
0.15%
1.47%
103,256
19,596
257,271
9,475,038
11,815,422
6,668
734
21,830
0.07%
0.01%
0.23%
12,379
971
40,036
9,475,038
11,815,422
77
1
305
0.00%
0.00%
0.00%
154
2
533
9,475,038
11,815,422
7
0
24
0.00%
0.00%
0.00%
14
0
40
9,475,038
11,815,422
0
0
0
0.00%
0.00%
0.00%
0
0
1
9,475,038
11,815,422
0
0
0
0.00%
0.00%
0.00%
0
0
0
7,754,323
7,894,773
4,962,911
662,021
7,485,956
64.00%
8.54%
96.54%
5,046,325
662,864
7,626,337
7,754,323
7,894,773
1,135,141
77,296
4,624,159
14.64%
1.00%
59.63%
1,153,247
77,297
4,708,840
7,754,323
7,894,773
56,030
1,012
226,563
0.72%
0.01%
2.92%
56,834
1,012
231,668
7,754,323
7,894,773
7,974
70
26,105
0.10%
0.00%
0.34%
8,075
70
26,829
7,754,323
7,894,773
340
1
1,202
0.00%
0.00%
0.02%
343
1
1,223
7,754,323
7,894,773
1
0
2
0.00%
0.00%
0.00%
1
0
2
7,754,323
7,894,773
0
0
0
0.00%
0.00%
0.00%
0
0
0
7,754,323
7,894,773
0
0
0
0.00%
0.00%
0.00%
0
0
0
7,754,323
7,894,773
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,306,816
2,174,064
620,139
130,933
1,056,058
47.45%
10.02%
80.81%
1,109,893
471,327
1,724,755
1,306,816
2,174,064
155,421
52,217
446,369
11.89%
4.00%
34.16%
481,336
338,312
857,138
1,306,816
2,174,064
27,921
6,546
65,089
2.14%
0.50%
4.98%
157,617
43,037
298,432
1,306,816
2,174,064
8,637
1,026
23,338
0.66%
0.08%
1.79%
52,852
6,744
134,680
1,306,816
2,174,064
1,047
43
3,407
0.08%
0.00%
0.26%
6,692
280
21,383
1,306,816
2,174,064
14
0
41
0.00%
0.00%
0.00%
91
0
269
1,306,816
2,174,064
1
0
3
0.00%
0.00%
0.00%
9
0
19
1,306,816
2,174,064
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,306,816
2,174,064
0
0
0
0.00%
0.00%
0.00%
0
0
0
413,900
1,746,585
265,840
164,402
388,211
64.23%
39.72%
93.79%
928,241
241,000
1,653,519
413,900
1,746,585
175,858
156,503
238,520
42.49%
37.81%
57.63%
311,749
156,958
740,111
413,900
1,746,585
104,589
58,765
147,916
25.27%
14.20%
35.74%
112,655
58,766
187,842
413,900
1,746,585
41,042
12,781
90,313
9.92%
3.09%
21.82%
42,328
12,781
95,762
413,900
1,746,585
5,280
690
17,221
1.28%
0.17%
4.16%
5,343
690
17,430
413,900
1,746,585
63
1
262
0.02%
0.00%
0.06%
63
1
262
413,900
1,746,585
5
0
21
0.00%
0.00%
0.01%
5
0
21
413,900
1,746,585
0
0
0
0.00%
0.00%
0.00%
0
0
0
413,900
1,746,585
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 42 of 58
December 2016

-------
D.6-0T Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
1
9
1
0
1
72.44%
7.94%
99.99%
6
1
9
2
1
9
0
0
1
20.55%
0.04%
75.48%
2
0
7
6
1
9
0
0
0
1.29%
0.00%
6.66%
0
0
1
10
1
9
0
0
0
0.20%
0.00%
0.87%
0
0
0
20
1
9
0
0
0
0.01%
0.00%
0.03%
0
0
0
60
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
1
9
1
0
1
72.44%
7.94%
99.99%
6
1
9
2
1
9
0
0
1
20.55%
0.04%
75.48%
2
0
7
6
1
9
0
0
0
1.29%
0.00%
6.66%
0
0
1
10
1
9
0
0
0
0.20%
0.00%
0.87%
0
0
0
20
1
9
0
0
0
0.01%
0.00%
0.03%
0
0
0
60
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
9
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 43 of 58
December 2016

-------
D.6-0T Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
40
22,661
29
3
40
72.44%
7.94%
99.99%
16,417
1,799
22,659
40
22,661
8
0
30
20.55%
0.04%
75.48%
4,656
8
17,104
40
22,661
1
0
3
1.29%
0.00%
6.66%
292
0
1,510
40
22,661
0
0
0
0.20%
0.00%
0.87%
45
0
197
40
22,661
0
0
0
0.01%
0.00%
0.03%
2
0
7
40
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
40
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
40
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
40
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
40
22,661
29
3
40
72.44%
7.94%
99.99%
16,417
1,799
22,659
40
22,661
8
0
30
20.55%
0.04%
75.48%
4,656
8
17,104
40
22,661
1
0
3
1.29%
0.00%
6.66%
292
0
1,510
40
22,661
0
0
0
0.20%
0.00%
0.87%
45
0
197
40
22,661
0
0
0
0.01%
0.00%
0.03%
2
0
7
40
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
40
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
40
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
40
22,661
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 44 of 58
December 2016

-------
D.6-0T Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
All Systems
0.6
5
36
3
2
4
57.43%
36.07%
81.98%
21
13
29
2
5
36
2
1
3
33.72%
21.16%
51.44%
12
8
18
6
5
36
1
1
2
19.47%
17.05%
26.18%
7
6
9
10
5
36
1
1
1
16.98%
15.08%
19.01%
6
5
7
20
5
36
1
0
1
11.35%
5.50%
16.27%
4
2
6
60
5
36
0
0
0
1.18%
0.12%
4.04%
0
0
1
100
5
36
0
0
0
0.20%
0.01%
0.84%
0
0
0
200
5
36
0
0
0
0.01%
0.00%
0.05%
0
0
0
600
5
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
2
12
2
2
2
99.72%
98.75%
100.00%
12
12
12
2
2
12
2
1
2
85.59%
62.22%
99.42%
10
8
12
6
2
12
1
1
1
56.25%
50.18%
71.16%
7
6
9
10
2
12
1
1
1
49.77%
44.36%
54.83%
6
5
7
20
2
12
1
0
1
33.38%
16.18%
47.81%
4
2
6
60
2
12
0
0
0
3.47%
0.34%
11.89%
0
0
1
100
2
12
0
0
0
0.60%
0.02%
2.48%
0
0
0
200
2
12
0
0
0
0.03%
0.00%
0.14%
0
0
0
600
2
12
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
3
24
1
0
2
35.66%
3.81%
72.70%
8
1
17
2
3
24
0
0
1
7.03%
0.03%
26.75%
2
0
6
6
3
24
0
0
0
0.54%
0.00%
3.02%
0
0
1
10
3
24
0
0
0
0.11%
0.00%
0.57%
0
0
0
20
3
24
0
0
0
0.01%
0.00%
0.03%
0
0
0
60
3
24
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
3
24
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
3
24
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
3
24
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 45 of 58
December 2016

-------
D.6-0T Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
225,056
1,021,805
101,083
39,332
171,732
61.32%
41.89%
83.39%
626,557
428,022
852,036
225,056
1,021,805
42,841
24,423
84,726
40.43%
30.15%
56.16%
413,090
308,074
573,879
225,056
1,021,805
24,144
21,821
32,074
28.88%
26.98%
34.26%
295,133
275,690
350,091
225,056
1,021,805
21,576
19,283
23,732
26.49%
23.84%
28.33%
270,668
243,618
289,472
225,056
1,021,805
14,546
7,026
20,895
17.97%
8.69%
25.78%
183,654
88,768
263,422
225,056
1,021,805
1,515
148
5,184
1.87%
0.18%
6.41%
19,139
1,869
65,498
225,056
1,021,805
260
11
1,081
0.32%
0.01%
1.34%
3,289
134
13,658
225,056
1,021,805
13
0
60
0.02%
0.00%
0.07%
159
2
755
225,056
1,021,805
0
0
0
0.00%
0.00%
0.00%
0
0
1
32,305
408,139
32,247
32,041
32,305
99.82%
99.18%
100.00%
407,401
404,810
408,139
32,305
408,139
29,279
24,372
32,183
90.63%
75.44%
99.62%
369,913
307,911
406,595
32,305
408,139
23,096
21,821
26,240
71.49%
67.55%
81.23%
291,795
275,690
331,520
32,305
408,139
21,373
19,283
22,636
66.16%
59.69%
70.07%
270,023
243,618
285,982
32,305
408,139
14,533
7,026
20,835
44.99%
21.75%
64.50%
183,613
88,768
263,233
32,305
408,139
1,515
148
5,184
4.69%
0.46%
16.05%
19,139
1,869
65,497
32,305
408,139
260
11
1,081
0.81%
0.03%
3.35%
3,289
134
13,658
32,305
408,139
13
0
60
0.04%
0.00%
0.18%
159
2
755
32,305
408,139
0
0
0
0.00%
0.00%
0.00%
0
0
1
192,751
613,666
68,836
7,291
139,427
35.71%
3.78%
72.34%
219,156
23,212
443,897
192,751
613,666
13,562
51
52,544
7.04%
0.03%
27.26%
43,177
163
167,284
192,751
613,666
1,048
0
5,833
0.54%
0.00%
3.03%
3,337
0
18,572
192,751
613,666
203
0
1,096
0.11%
0.00%
0.57%
645
0
3,491
192,751
613,666
13
0
59
0.01%
0.00%
0.03%
41
0
189
192,751
613,666
0
0
0
0.00%
0.00%
0.00%
0
0
0
192,751
613,666
0
0
0
0.00%
0.00%
0.00%
0
0
0
192,751
613,666
0
0
0
0.00%
0.00%
0.00%
0
0
0
192,751
613,666
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 46 of 58
December 2016

-------
D.6-0T Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All Systems
0.6
3
3
2
1
3
70.75%
33.75%
99.80%
2
1
3
2
3
3
1
0
2
33.88%
11.92%
72.45%
1
0
2
6
3
3
0
0
0
5.10%
0.31%
16.07%
0
0
0
10
3
3
0
0
0
1.11%
0.03%
4.29%
0
0
0
20
3
3
0
0
0
0.07%
0.00%
0.30%
0
0
0
60
3
3
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
3
3
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
3
3
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
3
3
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
1
1
1
0
1
66.49%
2.13%
99.97%
1
0
1
2
1
1
0
0
1
15.94%
0.00%
65.99%
0
0
1
6
1
1
0
0
0
0.92%
0.00%
4.45%
0
0
0
10
1
1
0
0
0
0.14%
0.00%
0.58%
0
0
0
20
1
1
0
0
0
0.01%
0.00%
0.02%
0
0
0
60
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
1
1
0
0
1
45.99%
0.12%
99.42%
0
0
1
2
1
1
0
0
1
9.86%
0.00%
52.88%
0
0
1
6
1
1
0
0
0
0.72%
0.00%
3.64%
0
0
0
10
1
1
0
0
0
0.16%
0.00%
0.57%
0
0
0
20
1
1
0
0
0
0.01%
0.00%
0.02%
0
0
0
60
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
1
1
1
1
1
99.77%
99.02%
100.00%
1
1
1
2
1
1
1
0
1
75.85%
35.76%
98.48%
1
0
1
6
1
1
0
0
0
13.65%
0.92%
40.13%
0
0
0
10
1
1
0
0
0
3.05%
0.08%
11.71%
0
0
0
20
1
1
0
0
0
0.20%
0.00%
0.85%
0
0
0
60
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 47 of 58
December 2016

-------
D.6-0T Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
701,961
701,961
469,185
110,994
700,936
66.84%
15.81%
99.85%
469,185
110,994
700,936
701,961
701,961
163,827
36,618
476,255
23.34%
5.22%
67.85%
163,827
36,618
476,255
701,961
701,961
19,184
938
66,511
2.73%
0.13%
9.47%
19,184
938
66,511
701,961
701,961
3,979
81
15,471
0.57%
0.01%
2.20%
3,979
81
15,471
701,961
701,961
257
1
992
0.04%
0.00%
0.14%
257
1
992
701,961
701,961
1
0
2
0.00%
0.00%
0.00%
1
0
2
701,961
701,961
0
0
0
0.00%
0.00%
0.00%
0
0
0
701,961
701,961
0
0
0
0.00%
0.00%
0.00%
0
0
0
701,961
701,961
0
0
0
0.00%
0.00%
0.00%
0
0
0
445,327
445,327
296,110
9,470
445,194
66.49%
2.13%
99.97%
296,110
9,470
445,194
445,327
445,327
70,996
21
293,884
15.94%
0.00%
65.99%
70,996
21
293,884
445,327
445,327
4,098
0
19,821
0.92%
0.00%
4.45%
4,098
0
19,821
445,327
445,327
618
0
2,600
0.14%
0.00%
0.58%
618
0
2,600
445,327
445,327
27
0
92
0.01%
0.00%
0.02%
27
0
92
445,327
445,327
0
0
0
0.00%
0.00%
0.00%
0
0
0
445,327
445,327
0
0
0
0.00%
0.00%
0.00%
0
0
0
445,327
445,327
0
0
0
0.00%
0.00%
0.00%
0
0
0
445,327
445,327
0
0
0
0.00%
0.00%
0.00%
0
0
0
154,288
154,288
70,965
179
153,397
45.99%
0.12%
99.42%
70,965
179
153,397
154,288
154,288
15,206
0
81,580
9.86%
0.00%
52.88%
15,206
0
81,580
154,288
154,288
1,116
0
5,619
0.72%
0.00%
3.64%
1,116
0
5,619
154,288
154,288
241
0
883
0.16%
0.00%
0.57%
241
0
883
154,288
154,288
23
0
32
0.01%
0.00%
0.02%
23
0
32
154,288
154,288
0
0
0
0.00%
0.00%
0.00%
0
0
0
154,288
154,288
0
0
0
0.00%
0.00%
0.00%
0
0
0
154,288
154,288
0
0
0
0.00%
0.00%
0.00%
0
0
0
154,288
154,288
0
0
0
0.00%
0.00%
0.00%
0
0
0
102,346
102,346
102,111
101,345
102,346
99.77%
99.02%
100.00%
102,111
101,345
102,346
102,346
102,346
77,625
36,597
100,791
75.85%
35.76%
98.48%
77,625
36,597
100,791
102,346
102,346
13,970
938
41,070
13.65%
0.92%
40.13%
13,970
938
41,070
102,346
102,346
3,120
81
11,988
3.05%
0.08%
11.71%
3,120
81
11,988
102,346
102,346
207
1
868
0.20%
0.00%
0.85%
207
1
868
102,346
102,346
1
0
2
0.00%
0.00%
0.00%
1
0
2
102,346
102,346
0
0
0
0.00%
0.00%
0.00%
0
0
0
102,346
102,346
0
0
0
0.00%
0.00%
0.00%
0
0
0
102,346
102,346
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 48 of 58
December 2016

-------
D.6-0T Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold - National
Extrapolation
Total Number of
Systems with Any
Detects Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All Systems
0.6
9
48
6
3
8
65.68%
35.35%
90.83%
29
15
41
2
9
48
3
2
6
34.94%
17.81%
63.55%
15
8
27
6
9
48
1
1
2
14.52%
11.25%
22.92%
7
6
10
10
9
48
1
1
1
11.49%
9.87%
13.90%
6
5
7
20
9
48
1
0
1
7.45%
3.59%
10.74%
4
2
6
60
9
48
0
0
0
0.77%
0.08%
2.64%
0
0
1
100
9
48
0
0
0
0.13%
0.01%
0.55%
0
0
0
200
9
48
0
0
0
0.01%
0.00%
0.03%
0
0
0
600
9
48
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
4
22
3
2
4
84.59%
51.89%
99.99%
19
13
22
2
4
22
2
1
3
51.92%
31.12%
85.08%
12
8
20
6
4
22
1
1
2
28.68%
25.09%
38.36%
7
6
9
10
4
22
1
1
1
24.97%
22.18%
27.78%
6
5
7
20
4
22
1
0
1
16.69%
8.09%
23.92%
4
2
6
60
4
22
0
0
0
1.74%
0.17%
5.94%
0
0
1
100
4
22
0
0
0
0.30%
0.01%
1.24%
0
0
0
200
4
22
0
0
0
0.01%
0.00%
0.07%
0
0
0
600
4
22
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
4
25
2
0
3
38.24%
2.89%
79.38%
9
1
18
2
4
25
0
0
1
7.73%
0.02%
33.28%
2
0
7
6
4
25
0
0
0
0.59%
0.00%
3.18%
0
0
1
10
4
25
0
0
0
0.12%
0.00%
0.57%
0
0
0
20
4
25
0
0
0
0.01%
0.00%
0.03%
0
0
0
60
4
25
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
4
25
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
4
25
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
4
25
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
1
1
1
1
1
99.77%
99.02%
100.00%
1
1
1
2
1
1
1
0
1
75.85%
35.76%
98.48%
1
0
1
6
1
1
0
0
0
13.65%
0.92%
40.13%
0
0
0
10
1
1
0
0
0
3.05%
0.08%
11.71%
0
0
0
20
1
1
0
0
0
0.20%
0.00%
0.85%
0
0
0
60
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 49 of 58
December 2016

-------
D.6-0T Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Systems
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
Detects Exceeding
Threshold
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding Threshold
- National
Extrapolation
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
927,057
1,746,427
570,297
150,330
872,708
61.52%
16.22%
94.14%
1,112,159
540,815
1,575,632
927,057
1,746,427
206,677
61,040
561,012
22.29%
6.58%
60.52%
581,574
344,700
1,067,238
927,057
1,746,427
43,329
22,760
98,587
4.67%
2.46%
10.63%
314,609
276,629
418,112
927,057
1,746,427
25,555
19,364
39,204
2.76%
2.09%
4.23%
274,692
243,698
305,140
927,057
1,746,427
14,803
7,028
21,887
1.60%
0.76%
2.36%
183,912
88,769
264,421
927,057
1,746,427
1,516
148
5,187
0.16%
0.02%
0.56%
19,140
1,869
65,500
927,057
1,746,427
260
11
1,081
0.03%
0.00%
0.12%
3,289
134
13,658
927,057
1,746,427
13
0
60
0.00%
0.00%
0.01%
159
2
755
927,057
1,746,427
0
0
0
0.00%
0.00%
0.00%
0
0
1
477,672
876,128
328,385
41,515
477,539
68.75%
8.69%
99.97%
719,927
416,079
875,992
477,672
876,128
100,283
24,392
326,097
20.99%
5.11%
68.27%
445,565
307,940
717,583
477,672
876,128
27,194
21,821
46,064
5.69%
4.57%
9.64%
296,185
275,690
352,851
477,672
876,128
21,991
19,283
25,236
4.60%
4.04%
5.28%
270,686
243,618
288,779
477,672
876,128
14,560
7,026
20,928
3.05%
1.47%
4.38%
183,642
88,768
263,332
477,672
876,128
1,515
148
5,184
0.32%
0.03%
1.09%
19,139
1,869
65,498
477,672
876,128
260
11
1,081
0.05%
0.00%
0.23%
3,289
134
13,658
477,672
876,128
13
0
60
0.00%
0.00%
0.01%
159
2
755
477,672
876,128
0
0
0
0.00%
0.00%
0.00%
0
0
1
347,039
767,954
139,801
7,470
292,824
40.28%
2.15%
84.38%
290,120
23,391
597,294
347,039
767,954
28,768
51
134,124
8.29%
0.01%
38.65%
58,384
163
248,864
347,039
767,954
2,165
0
11,452
0.62%
0.00%
3.30%
4,453
0
24,191
347,039
767,954
444
0
1,979
0.13%
0.00%
0.57%
887
0
4,373
347,039
767,954
36
0
91
0.01%
0.00%
0.03%
64
0
221
347,039
767,954
0
0
0
0.00%
0.00%
0.00%
0
0
0
347,039
767,954
0
0
0
0.00%
0.00%
0.00%
0
0
0
347,039
767,954
0
0
0
0.00%
0.00%
0.00%
0
0
0
347,039
767,954
0
0
0
0.00%
0.00%
0.00%
0
0
0
102,346
102,346
102,111
101,345
102,346
99.77%
99.02%
100.00%
102,111
101,345
102,346
102,346
102,346
77,625
36,597
100,791
75.85%
35.76%
98.48%
77,625
36,597
100,791
102,346
102,346
13,970
938
41,070
13.65%
0.92%
40.13%
13,970
938
41,070
102,346
102,346
3,120
81
11,988
3.05%
0.08%
11.71%
3,120
81
11,988
102,346
102,346
207
1
868
0.20%
0.00%
0.85%
207
1
868
102,346
102,346
1
0
2
0.00%
0.00%
0.00%
1
0
2
102,346
102,346
0
0
0
0.00%
0.00%
0.00%
0
0
0
102,346
102,346
0
0
0
0.00%
0.00%
0.00%
0
0
0
102,346
102,346
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 50 of 58
December 2016

-------
D.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold
Total Number of
Systems with Any
Detects Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
55
8,222
9
4
14
12.87%
6.94%
20.49%
1,058
570
1,684
2
55
8,222
2
1
4
3.64%
1.68%
5.99%
299
139
493
6
55
8,222
0
0
1
0.56%
0.09%
1.41%
46
8
116
10
55
8,222
0
0
0
0.16%
0.01%
0.53%
13
1
44
20
55
8,222
0
0
0
0.02%
0.00%
0.08%
2
0
7
60
55
8,222
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
55
8,222
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
55
8,222
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
55
8,222
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
4
36
2
1
4
54.77%
19.65%
88.30%
20
7
32
2
4
36
0
0
1
11.98%
0.42%
32.90%
4
0
12
6
4
36
0
0
0
0.67%
0.00%
2.96%
0
0
1
10
4
36
0
0
0
0.10%
0.00%
0.47%
0
0
0
20
4
36
0
0
0
0.00%
0.00%
0.02%
0
0
0
60
4
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
4
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
4
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
4
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
51
8,187
6
4
10
12.68%
6.88%
20.19%
1,038
563
1,653
2
51
8,187
2
1
3
3.60%
1.69%
5.88%
295
138
481
6
51
8,187
0
0
1
0.56%
0.09%
1.40%
46
8
115
10
51
8,187
0
0
0
0.16%
0.01%
0.53%
13
1
44
20
51
8,187
0
0
0
0.02%
0.00%
0.08%
2
0
7
60
51
8,187
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
51
8,187
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
51
8,187
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
51
8,187
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 51 of 58
December 2016

-------
D.7 - ND Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Systems
Detects Exceeding


Threshold - National


Threshold - National




Threshold
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
42,570
6,985,901
13,217
9,144
18,517
30.86%
21.53%
43.10%
2,155,591
1,504,215
3,011,252
42,570
6,985,901
6,073
1,764
9,706
14.29%
4.17%
22.68%
997,958
291,632
1,584,446
42,570
6,985,901
1,081
69
3,578
2.56%
0.16%
8.45%
178,508
11,424
590,281
42,570
6,985,901
305
11
1,172
0.72%
0.03%
2.77%
50,374
1,786
193,582
42,570
6,985,901
34
0
158
0.08%
0.00%
0.37%
5,543
62
26,085
42,570
6,985,901
0
0
1
0.00%
0.00%
0.00%
50
0
237
42,570
6,985,901
0
0
0
0.00%
0.00%
0.00%
3
0
20
42,570
6,985,901
0
0
0
0.00%
0.00%
0.00%
0
0
0
42,570
6,985,901
0
0
0
0.00%
0.00%
0.00%
0
0
0
895
90,645
487
135
817
54.45%
15.12%
91.29%
49,357
13,701
82,753
895
90,645
108
3
335
12.04%
0.33%
37.45%
10,913
301
33,949
895
90,645
6
0
26
0.71%
0.00%
2.92%
643
1
2,646
895
90,645
1
0
4
0.11%
0.00%
0.44%
102
0
399
895
90,645
0
0
0
0.01%
0.00%
0.02%
5
0
15
895
90,645
0
0
0
0.00%
0.00%
0.00%
0
0
0
895
90,645
0
0
0
0.00%
0.00%
0.00%
0
0
0
895
90,645
0
0
0
0.00%
0.00%
0.00%
0
0
0
895
90,645
0
0
0
0.00%
0.00%
0.00%
0
0
0
41,675
6,895,255
12,730
9,009
17,700
30.55%
21.62%
42.47%
2,106,234
1,490,514
2,928,498
41,675
6,895,255
5,966
1,761
9,371
14.31%
4.23%
22.49%
987,044
291,330
1,550,496
41,675
6,895,255
1,075
69
3,552
2.58%
0.17%
8.52%
177,865
11,423
587,635
41,675
6,895,255
304
11
1,168
0.73%
0.03%
2.80%
50,272
1,786
193,183
41,675
6,895,255
33
0
158
0.08%
0.00%
0.38%
5,538
62
26,070
41,675
6,895,255
0
0
1
0.00%
0.00%
0.00%
50
0
237
41,675
6,895,255
0
0
0
0.00%
0.00%
0.00%
3
0
20
41,675
6,895,255
0
0
0
0.00%
0.00%
0.00%
0
0
0
41,675
6,895,255
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 52 of 58
December 2016

-------
D.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold
Total Number of
Systems with Any
Detects Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
All Systems
0.6
3
24
1
0
2
19.66%
0.23%
52.76%
5
0
13
2
3
24
0
0
0
2.75%
0.00%
13.39%
1
0
3
6
3
24
0
0
0
0.12%
0.00%
0.55%
0
0
0
10
3
24
0
0
0
0.02%
0.00%
0.07%
0
0
0
20
3
24
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
3
24
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
3
24
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
3
24
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
3
24
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
3
24
1
0
2
19.66%
0.23%
52.76%
5
0
13
2
3
24
0
0
0
2.75%
0.00%
13.39%
1
0
3
6
3
24
0
0
0
0.12%
0.00%
0.55%
0
0
0
10
3
24
0
0
0
0.02%
0.00%
0.07%
0
0
0
20
3
24
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
3
24
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
3
24
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
3
24
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
3
24
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 53 of 58
December 2016

-------
D.7 - ND Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Systems
Detects Exceeding


Threshold - National


Threshold - National




Threshold
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
167,731
613,666
30,095
279
92,488
17.94%
0.17%
55.14%
110,106
1,022
338,381
167,731
613,666
4,101
1
22,796
2.45%
0.00%
13.59%
15,006
2
83,403
167,731
613,666
166
0
831
0.10%
0.00%
0.50%
608
0
3,039
167,731
613,666
23
0
89
0.01%
0.00%
0.05%
85
0
325
167,731
613,666
1
0
2
0.00%
0.00%
0.00%
4
0
9
167,731
613,666
0
0
0
0.00%
0.00%
0.00%
0
0
0
167,731
613,666
0
0
0
0.00%
0.00%
0.00%
0
0
0
167,731
613,666
0
0
0
0.00%
0.00%
0.00%
0
0
0
167,731
613,666
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
167,731
613,666
30,095
279
92,488
17.94%
0.17%
55.14%
110,106
1,022
338,381
167,731
613,666
4,101
1
22,796
2.45%
0.00%
13.59%
15,006
2
83,403
167,731
613,666
166
0
831
0.10%
0.00%
0.50%
608
0
3,039
167,731
613,666
23
0
89
0.01%
0.00%
0.05%
85
0
325
167,731
613,666
1
0
2
0.00%
0.00%
0.00%
4
0
9
167,731
613,666
0
0
0
0.00%
0.00%
0.00%
0
0
0
167,731
613,666
0
0
0
0.00%
0.00%
0.00%
0
0
0
167,731
613,666
0
0
0
0.00%
0.00%
0.00%
0
0
0
167,731
613,666
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 54 of 58
December 2016

-------
D.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold
Total Number of
Systems with Any
Detects Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All Systems
0.6
1
1
0
0
1
13.24%
0.00%
80.43%
0
0
1
2
1
1
0
0
0
1.90%
0.00%
11.47%
0
0
0
6
1
1
0
0
0
0.08%
0.00%
0.25%
0
0
0
10
1
1
0
0
0
0.01%
0.00%
0.02%
0
0
0
20
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
1
1
0
0
1
13.24%
0.00%
80.43%
0
0
1
2
1
1
0
0
0
1.90%
0.00%
11.47%
0
0
0
6
1
1
0
0
0
0.08%
0.00%
0.25%
0
0
0
10
1
1
0
0
0
0.01%
0.00%
0.02%
0
0
0
20
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
1
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 55 of 58
December 2016

-------
D.7 - ND Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Systems
Detects Exceeding


Threshold - National


Threshold - National




Threshold
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
107,323
107,323
14,213
0
86,325
13.24%
0.00%
80.43%
14,213
0
86,325
107,323
107,323
2,037
0
12,314
1.90%
0.00%
11.47%
2,037
0
12,314
107,323
107,323
89
0
273
0.08%
0.00%
0.25%
89
0
273
107,323
107,323
12
0
22
0.01%
0.00%
0.02%
12
0
22
107,323
107,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
107,323
107,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
107,323
107,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
107,323
107,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
107,323
107,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
107,323
107,323
14,213
0
86,325
13.24%
0.00%
80.43%
14,213
0
86,325
107,323
107,323
2,037
0
12,314
1.90%
0.00%
11.47%
2,037
0
12,314
107,323
107,323
89
0
273
0.08%
0.00%
0.25%
89
0
273
107,323
107,323
12
0
22
0.01%
0.00%
0.02%
12
0
22
107,323
107,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
107,323
107,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
107,323
107,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
107,323
107,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
107,323
107,323
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 56 of 58
December 2016

-------
D.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Total Number of
UCMR 2 Systems
Predicted to
have Any
Detects
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems Predicted to have Any
Detects Exceeding Threshold
Percent of
Systems with
Any Detects
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Systems
with Any Detects Exceeding
Threshold
Total Number of
Systems with Any
Detects Exceeding
Threshold -
National
Extrapolation
90% CI on Total Number of
Systems with Any Detects
Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All Systems
0.6
59
8,247
9
4
16
15.90%
7.29%
27.48%
1,063
570
1,698
2
59
8,247
2
1
5
4.10%
1.49%
8.19%
300
139
496
6
59
8,247
0
0
1
0.54%
0.08%
1.45%
46
8
116
10
59
8,247
0
0
0
0.15%
0.01%
0.50%
13
1
44
20
59
8,247
0
0
0
0.02%
0.00%
0.07%
2
0
7
60
59
8,247
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
59
8,247
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
59
8,247
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
59
8,247
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
4
36
2
1
4
54.77%
19.65%
88.30%
20
7
32
2
4
36
0
0
1
11.98%
0.42%
32.90%
4
0
12
6
4
36
0
0
0
0.67%
0.00%
2.96%
0
0
1
10
4
36
0
0
0
0.10%
0.00%
0.47%
0
0
0
20
4
36
0
0
0
0.00%
0.00%
0.02%
0
0
0
60
4
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
4
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
4
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
4
36
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
55
8,211
7
4
13
13.07%
6.39%
23.06%
1,043
563
1,666
2
55
8,211
2
1
4
3.53%
1.57%
6.39%
296
138
484
6
55
8,211
0
0
1
0.53%
0.09%
1.34%
46
8
115
10
55
8,211
0
0
0
0.15%
0.01%
0.50%
13
1
44
20
55
8,211
0
0
0
0.02%
0.00%
0.08%
2
0
7
60
55
8,211
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
55
8,211
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
55
8,211
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
55
8,211
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 57 of 58
December 2016

-------
D.7 - ND Only
Total Population
Served by UCMR
2 Systems
National
Population
Served by
Total Population
Served by UCMR 2
Systems Predicted
to Have Any
90% CI on Population Served by UCMR 2
Systems Predicted to have Any Detects
Exceeding Threshold
Percent of Pop.
Served by Systems
with Any Detects
Exceeding
90% CI on Percent of Systems with Any
Detects Exceeding Threshold - National
Extrapolation
Total Population
Served by Systems
with Any Detects
Exceeding
90% CI on Population Served by Systems
with Any Detects Exceeding Threshold -
National Extrapolation
Systems
Detects Exceeding


Threshold - National


Threshold - National




Threshold
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
ALL SYSTEMS
317,624
7,706,889
57,525
9,423
197,330
18.11%
2.97%
62.13%
2,279,910
1,505,238
3,435,957
317,624
7,706,889
12,212
1,764
44,816
3.84%
0.56%
14.11%
1,015,000
291,634
1,680,163
317,624
7,706,889
1,337
69
4,681
0.42%
0.02%
1.47%
179,206
11,424
593,593
317,624
7,706,889
340
11
1,283
0.11%
0.00%
0.40%
50,471
1,786
193,929
317,624
7,706,889
35
0
160
0.01%
0.00%
0.05%
5,547
62
26,094
317,624
7,706,889
0
0
1
0.00%
0.00%
0.00%
50
0
237
317,624
7,706,889
0
0
0
0.00%
0.00%
0.00%
3
0
20
317,624
7,706,889
0
0
0
0.00%
0.00%
0.00%
0
0
0
317,624
7,706,889
0
0
0
0.00%
0.00%
0.00%
0
0
0
895
90,645
487
135
817
54.45%
15.12%
91.29%
49,357
13,701
82,753
895
90,645
108
3
335
12.04%
0.33%
37.45%
10,913
301
33,949
895
90,645
6
0
26
0.71%
0.00%
2.92%
643
1
2,646
895
90,645
1
0
4
0.11%
0.00%
0.44%
102
0
399
895
90,645
0
0
0
0.01%
0.00%
0.02%
5
0
15
895
90,645
0
0
0
0.00%
0.00%
0.00%
0
0
0
895
90,645
0
0
0
0.00%
0.00%
0.00%
0
0
0
895
90,645
0
0
0
0.00%
0.00%
0.00%
0
0
0
895
90,645
0
0
0
0.00%
0.00%
0.00%
0
0
0
316,729
7,616,244
57,038
9,288
196,513
18.01%
2.93%
62.04%
2,230,553
1,491,537
3,353,204
316,729
7,616,244
12,104
1,761
44,481
3.82%
0.56%
14.04%
1,004,087
291,332
1,646,213
316,729
7,616,244
1,330
69
4,655
0.42%
0.02%
1.47%
178,563
11,423
590,947
316,729
7,616,244
339
11
1,279
0.11%
0.00%
0.40%
50,369
1,786
193,530
316,729
7,616,244
35
0
160
0.01%
0.00%
0.05%
5,542
62
26,079
316,729
7,616,244
0
0
1
0.00%
0.00%
0.00%
50
0
237
316,729
7,616,244
0
0
0
0.00%
0.00%
0.00%
3
0
20
316,729
7,616,244
0
0
0
0.00%
0.00%
0.00%
0
0
0
316,729
7,616,244
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix D
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 58 of 58
December 2016

-------
Appendix E
National Extrapolation of Facilities
and Population Served Predicted
To Have a Mean Concentration
Exceeding Thresholds
Appendix E
Six-Year Review 3
Technical Support Document for Nitrosamines Page 1 of 114
December 2016

-------
The UCMR 2 data set for nitrosamines includes data for 1,198 systems, 4,666 entry
point locations and 2,397 maximum residence time locations. A model was used to
generate estimates of NDMA occurrence. The purpose of the model was to estimate
the mean concentration of NDMA in the drinking water of each water system in
UCMR, heterogeneity across systems in their means, variability around those means
and uncertainty in those estimates. Appendix E provides a national extrapolation of
facilities and population served by facilities (broken down by source water type)
predicted to have a mean concentration exceeding the HRL and other thresholds.
Tables are first presented for all disinfectants, and then for chlorine (CL Only),
chloramines (CA Only), chloramines with other types of disinfectants (CA with CL-OT),
chlorine with other types of disinfectants (CL with OT), other types of disinfectants (OT
Only) and no disinfectant (ND Only).
Appendix E
Six-Year Review 3
Technical Support Document for Nitrosamines Page 2 of 114
December 2016

-------
E.l - All Disinfection Types







90% CI on Number of UCMR 2 EPs
Percentage of
90% CI on Percentage of EPs with

90% CI on Number of EPs with



Number of



with Predicted Mean Exceeding
EPs with
Predicted Mean Exceeding
Total Number of EPs
Mean Exceeding Threshold -
Source Water Type
Threshold (ng/L)
Total
Number of
UCMR2 EPs with
Predicted Mean
National #
Systems
EP Ratio
National Number
of EPs
Threshold
Predicted Mean
Exceeding
Threshold - National Extrapolation
with Mean
Exceeding Threshold
National Extrapolation


UCMR2 EPs
Exceeding



Threshold -


- National





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)

0.6
677
117
41,962
1.664
69,831
87
155
17.32%
12.85%
22.90%
5,949
3,496
9,208

2
677
48
41,962
1.664
69,831
34
61
7.09%
5.02%
9.06%
1,945
1,021
3,025

6
677
20
41,962
1.664
69,831
14
29
3.00%
2.07%
4.28%
677
412
1,128

10
677
13
41,962
1.664
69,831
8
17
1.96%
1.18%
2.56%
404
215
585
All EPs Only
20
677
6
41,962
1.664
69,831
3
12
0.96%
0.44%
1.77%
146
27
322

60
677
1
41,962
1.664
69,831
0
3
0.17%
0.00%
0.44%
13
0
27

100
677
0
41,962
1.664
69,831
0
1
0.04%
0.00%
0.15%
2
0
9

200
677
0
41,962
1.664
69,831
0
0
0.00%
0.00%
0.00%
0
0
0

600
677
0
41,962
1.664
69,831
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
232
71
1,986
1.045
2,075
58
86
30.57%
25.00%
37.07%
634
519
769

2
232
30
1,986
1.045
2,075
24
35
13.08%
10.34%
15.09%
272
215
313

6
232
14
1,986
1.045
2,075
10
18
5.86%
4.31%
7.76%
122
89
161
EPs Only at Surface
Water Systems
10
232
9
1,986
1.045
2,075
6
11
4.01%
2.59%
4.89%
83
54
102
20
232
5
1,986
1.045
2,075
3
9
2.26%
1.29%
3.88%
47
27
81
60
232
1
1,986
1.045
2,075
0
3
0.48%
0.00%
1.29%
10
0
27

100
232
0
1,986
1.045
2,075
0
1
0.11%
0.00%
0.43%
2
0
9

200
232
0
1,986
1.045
2,075
0
0
0.00%
0.00%
0.00%
0
0
0

600
232
0
1,986
1.045
2,075
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
399
20
38,525
1.663
64,048
8
36
4.95%
2.01%
9.02%
3,173
1,284
5,779

2
399
3
38,525
1.663
64,048
0
7
0.79%
0.00%
1.84%
507
0
1,180

6
399
0
38,525
1.663
64,048
0
1
0.04%
0.00%
0.25%
26
0
161
EPs Only at Ground
Water Systems
10
399
0
38,525
1.663
64,048
0
0
0.00%
0.00%
0.00%
3
0
0
20
399
0
38,525
1.663
64,048
0
0
0.00%
0.00%
0.00%
0
0
0
60
399
0
38,525
1.663
64,048
0
0
0.00%
0.00%
0.00%
0
0
0

100
399
0
38,525
1.663
64,048
0
0
0.00%
0.00%
0.00%
0
0
0

200
399
0
38,525
1.663
64,048
0
0
0.00%
0.00%
0.00%
0
0
0

600
399
0
38,525
1.663
64,048
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
46
27
1,451
2.556
3,708
21
33
57.76%
45.65%
71.74%
2,142
1,693
2,660

2
46
14
1,451
2.556
3,708
10
19
31.45%
21.74%
41.30%
1,166
806
1,532

6
46
7
1,451
2.556
3,708
4
10
14.29%
8.70%
21.74%
530
322
806
EPs Only at
10
46
4
1,451
2.556
3,708
2
6
8.56%
4.35%
13.04%
317
161
484
Mixed Water
20
46
1
1,451
2.556
3,708
0
3
2.68%
0.00%
6.52%
99
0
242
Systems
60
46
0
1,451
2.556
3,708
0
0
0.09%
0.00%
0.00%
3
0
0

100
46
0
1,451
2.556
3,708
0
0
0.00%
0.00%
0.00%
0
0
0

200
46
0
1,451
2.556
3,708
0
0
0.00%
0.00%
0.00%
0
0
0

600
46
0
1,451
2.556
3,708
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 3 of 114
December 2016

-------
E.l - All Disinfection Types
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
676,750
153,861
41,154,840
0.637
26,208,588
111,835
204,609
22.74%
16.53%
30.23%
3,493,992
2,108,036
5,437,406
676,750
72,928
41,154,840
0.637
26,208,588
51,186
96,980
10.78%
7.56%
14.33%
1,262,442
658,062
2,179,121
676,750
30,858
41,154,840
0.637
26,208,588
20,075
48,677
4.56%
2.97%
7.19%
384,416
212,589
729,960
676,750
19,632
41,154,840
0.637
26,208,588
11,598
28,940
2.90%
1.71%
4.28%
217,360
98,628
356,427
676,750
10,235
41,154,840
0.637
26,208,588
4,614
17,944
1.51%
0.68%
2.65%
84,514
26,815
189,657
676,750
2,537
41,154,840
0.637
26,208,588
0
4,614
0.37%
0.00%
0.68%
15,913
0
26,815
676,750
724
41,154,840
0.637
26,208,588
0
3,300
0.11%
0.00%
0.49%
4,259
0
19,336
676,750
6
41,154,840
0.637
26,208,588
0
0
0.00%
0.00%
0.00%
36
0
0
676,750
0
41,154,840
0.637
26,208,588
0
0
0.00%
0.00%
0.00%
0
0
0
288,792
104,085
5,030,810
0.505
2,539,891
81,769
128,068
36.04%
28.31%
44.35%
787,996
600,109
1,009,151
288,792
53,687
5,030,810
0.505
2,539,891
41,071
63,566
18.59%
14.22%
22.01%
345,745
259,693
418,458
288,792
24,793
5,030,810
0.505
2,539,891
16,900
36,638
8.59%
5.85%
12.69%
154,220
102,676
233,961
288,792
16,350
5,030,810
0.505
2,539,891
10,457
23,283
5.66%
3.62%
8.06%
98,648
59,308
146,223
288,792
9,308
5,030,810
0.505
2,539,891
4,614
15,096
3.22%
1.60%
5.23%
54,085
26,815
93,479
288,792
2,502
5,030,810
0.505
2,539,891
0
4,614
0.87%
0.00%
1.60%
14,811
0
26,815
288,792
724
5,030,810
0.505
2,539,891
0
3,300
0.25%
0.00%
1.14%
4,259
0
19,336
288,792
6
5,030,810
0.505
2,539,891
0
0
0.00%
0.00%
0.00%
36
0
0
288,792
0
5,030,810
0.505
2,539,891
0
0
0.00%
0.00%
0.00%
0
0
0
339,504
19,111
32,448,261
0.665
21,565,984
7,876
37,798
5.63%
2.32%
11.13%
1,426,077
576,923
2,813,001
339,504
3,558
32,448,261
0.665
21,565,984
0
9,107
1.05%
0.00%
2.68%
280,224
0
762,233
339,504
216
32,448,261
0.665
21,565,984
0
1,925
0.06%
0.00%
0.57%
13,095
0
97,631
339,504
24
32,448,261
0.665
21,565,984
0
0
0.01%
0.00%
0.00%
1,355
0
0
339,504
0
32,448,261
0.665
21,565,984
0
0
0.00%
0.00%
0.00%
0
0
0
339,504
0
32,448,261
0.665
21,565,984
0
0
0.00%
0.00%
0.00%
0
0
0
339,504
0
32,448,261
0.665
21,565,984
0
0
0.00%
0.00%
0.00%
0
0
0
339,504
0
32,448,261
0.665
21,565,984
0
0
0.00%
0.00%
0.00%
0
0
0
339,504
0
32,448,261
0.665
21,565,984
0
0
0.00%
0.00%
0.00%
0
0
0
48,454
30,666
3,675,769
0.572
2,102,713
22,190
38,743
63.29%
45.79%
79.96%
1,279,919
931,003
1,615,253
48,454
15,683
3,675,769
0.572
2,102,713
10,114
24,308
32.37%
20.87%
50.17%
636,473
398,369
998,429
48,454
5,849
3,675,769
0.572
2,102,713
3,175
10,114
12.07%
6.55%
20.87%
217,101
109,914
398,369
48,454
3,258
3,675,769
0.572
2,102,713
1,141
5,657
6.72%
2.36%
11.68%
117,357
39,320
210,204
48,454
927
3,675,769
0.572
2,102,713
0
2,848
1.91%
0.00%
5.88%
30,429
0
96,178
48,454
35
3,675,769
0.572
2,102,713
0
0
0.07%
0.00%
0.00%
1,102
0
0
48,454
0
3,675,769
0.572
2,102,713
0
0
0.00%
0.00%
0.00%
0
0
0
48,454
0
3,675,769
0.572
2,102,713
0
0
0.00%
0.00%
0.00%
0
0
0
48,454
0
3,675,769
0.572
2,102,713
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 4 of 114
December 2016

-------
E.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total Number of
UCMR2 MRs
Number of
UCMR2 MRs with
Predicted Mean
Exceeding
Threshold
National #
Systems
MR Ratio
National Number
of MRs
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All MRs Only
0.6
503
149
41,962
1.034
43,370
117
186
29.53%
23.26%
36.98%
7,226
4,674
10,323
2
503
59
41,962
1.034
43,370
47
74
11.80%
9.34%
14.71%
2,273
1,504
3,460
6
503
26
41,962
1.034
43,370
19
34
5.09%
3.78%
6.76%
827
528
1,172
10
503
17
41,962
1.034
43,370
11
23
3.37%
2.19%
4.57%
486
242
707
20
503
10
41,962
1.034
43,370
8
14
1.99%
1.59%
2.78%
247
215
412
60
503
3
41,962
1.034
43,370
1
5
0.60%
0.20%
0.99%
152
81
188
100
503
1
41,962
1.034
43,370
0
3
0.24%
0.00%
0.60%
75
0
170
200
503
0
41,962
1.034
43,370
0
1
0.03%
0.00%
0.20%
12
0
81
600
503
0
41,962
1.034
43,370
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
226
96
1,986
1.018
2,022
82
112
42.43%
36.28%
49.56%
858
734
1,002
2
226
39
1,986
1.018
2,022
33
45
17.35%
14.60%
19.91%
351
295
403
6
226
18
1,986
1.018
2,022
14
23
7.82%
6.19%
10.18%
158
125
206
10
226
12
1,986
1.018
2,022
9
16
5.46%
3.98%
7.08%
110
81
143
20
226
8
1,986
1.018
2,022
6
10
3.46%
2.65%
4.42%
70
54
89
60
226
1
1,986
1.018
2,022
0
3
0.56%
0.00%
1.33%
11
0
27
100
226
0
1,986
1.018
2,022
0
1
0.13%
0.00%
0.44%
3
0
9
200
226
0
1,986
1.018
2,022
0
0
0.00%
0.00%
0.00%
0
0
0
600
226
0
1,986
1.018
2,022
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Ground Water
Systems
0.6
238
27
38,525
0.992
38,204
14
42
11.17%
5.88%
17.65%
4,268
2,247
6,742
2
238
4
38,525
0.992
38,204
1
9
1.56%
0.42%
3.78%
595
161
1,445
6
238
0
38,525
0.992
38,204
0
1
0.15%
0.00%
0.42%
57
0
161
10
238
0
38,525
0.992
38,204
0
0
0.02%
0.00%
0.00%
7
0
0
20
238
0
38,525
0.992
38,204
0
0
0.00%
0.00%
0.00%
0
0
0
60
238
0
38,525
0.992
38,204
0
0
0.00%
0.00%
0.00%
0
0
0
100
238
0
38,525
0.992
38,204
0
0
0.00%
0.00%
0.00%
0
0
0
200
238
0
38,525
0.992
38,204
0
0
0.00%
0.00%
0.00%
0
0
0
600
238
0
38,525
0.992
38,204
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
39
26
1,451
2.167
3,144
21
32
66.79%
53.85%
82.05%
2,100
1,693
2,580
2
39
16
1,451
2.167
3,144
13
20
42.21%
33.33%
51.28%
1,327
1,048
1,612
6
39
8
1,451
2.167
3,144
5
10
19.47%
12.82%
25.64%
612
403
806
10
39
5
1,451
2.167
3,144
2
7
11.70%
5.13%
17.95%
368
161
564
20
39
2
1,451
2.167
3,144
2
4
5.62%
5.13%
10.26%
177
161
322
60
39
2
1,451
2.167
3,144
1
2
4.48%
2.56%
5.13%
141
81
161
100
39
1
1,451
2.167
3,144
0
2
2.30%
0.00%
5.13%
72
0
161
200
39
0
1,451
2.167
3,144
0
1
0.39%
0.00%
2.56%
12
0
81
600
39
0
1,451
2.167
3,144
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 5 of 114
December 2016

-------
E.l - All Disinfection Types
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served by
MRs with Mean
Exceeding Threshold
- National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
532,171
183,519
41,154,840
0.364
14,983,451
141,156
233,778
34.49%
26.52%
43.93%
3,287,378
2,131,471
4,798,942
532,171
84,675
41,154,840
0.364
14,983,451
64,621
106,693
15.91%
12.14%
20.05%
1,174,375
734,759
1,771,238
532,171
41,002
41,154,840
0.364
14,983,451
29,604
57,335
7.70%
5.56%
10.77%
433,388
280,968
692,706
532,171
27,843
41,154,840
0.364
14,983,451
20,213
37,832
5.23%
3.80%
7.11%
264,355
156,357
380,886
532,171
16,566
41,154,840
0.364
14,983,451
11,477
21,510
3.11%
2.16%
4.04%
139,842
106,913
200,845
532,171
4,433
41,154,840
0.364
14,983,451
814
6,243
0.83%
0.15%
1.17%
62,194
25,584
77,983
532,171
1,616
41,154,840
0.364
14,983,451
0
4,929
0.30%
0.00%
0.93%
28,155
0
70,503
532,171
150
41,154,840
0.364
14,983,451
0
814
0.03%
0.00%
0.15%
4,073
0
25,584
532,171
0
41,154,840
0.364
14,983,451
0
0
0.00%
0.00%
0.00%
0
0
0
284,899
134,223
5,030,810
0.497
2,502,576
112,337
159,070
47.11%
39.43%
55.83%
1,061,383
860,124
1,291,150
284,899
66,512
5,030,810
0.497
2,502,576
54,536
76,444
23.35%
19.14%
26.83%
435,295
346,746
515,026
284,899
34,575
5,030,810
0.497
2,502,576
25,614
46,507
12.14%
8.99%
16.32%
204,082
145,471
286,153
284,899
24,102
5,030,810
0.497
2,502,576
18,584
32,241
8.46%
6.52%
11.32%
137,703
105,190
186,923
284,899
14,788
5,030,810
0.497
2,502,576
9,849
18,618
5.19%
3.46%
6.53%
83,523
55,746
105,386
284,899
3,012
5,030,810
0.497
2,502,576
0
4,614
1.06%
0.00%
1.62%
17,542
0
26,815
284,899
884
5,030,810
0.497
2,502,576
0
3,300
0.31%
0.00%
1.16%
5,159
0
19,336
284,899
25
5,030,810
0.497
2,502,576
0
0
0.01%
0.00%
0.00%
145
0
0
284,899
0
5,030,810
0.497
2,502,576
0
0
0.00%
0.00%
0.00%
0
0
0
208,860
23,447
32,448,261
0.335
10,882,277
10,998
40,673
11.23%
5.27%
19.47%
1,182,168
531,898
2,128,914
208,860
3,461
32,448,261
0.335
10,882,277
495
8,683
1.66%
0.24%
4.16%
152,944
19,859
400,036
208,860
434
32,448,261
0.335
10,882,277
0
1,950
0.21%
0.00%
0.93%
17,451
0
78,232
208,860
52
32,448,261
0.335
10,882,277
0
0
0.03%
0.00%
0.00%
2,095
0
0
208,860
0
32,448,261
0.335
10,882,277
0
0
0.00%
0.00%
0.00%
0
0
0
208,860
0
32,448,261
0.335
10,882,277
0
0
0.00%
0.00%
0.00%
0
0
0
208,860
0
32,448,261
0.335
10,882,277
0
0
0.00%
0.00%
0.00%
0
0
0
208,860
0
32,448,261
0.335
10,882,277
0
0
0.00%
0.00%
0.00%
0
0
0
208,860
0
32,448,261
0.335
10,882,277
0
0
0.00%
0.00%
0.00%
0
0
0
38,412
25,850
3,675,769
0.435
1,598,599
17,821
34,035
67.30%
46.39%
88.60%
1,043,827
739,449
1,378,878
38,412
14,701
3,675,769
0.435
1,598,599
9,591
21,566
38.27%
24.97%
56.15%
586,136
368,154
856,176
38,412
5,993
3,675,769
0.435
1,598,599
3,990
8,878
15.60%
10.39%
23.11%
211,855
135,497
328,321
38,412
3,689
3,675,769
0.435
1,598,599
1,629
5,591
9.60%
4.24%
14.55%
124,558
51,168
193,963
38,412
1,778
3,675,769
0.435
1,598,599
1,629
2,892
4.63%
4.24%
7.53%
56,319
51,168
95,459
38,412
1,421
3,675,769
0.435
1,598,599
814
1,629
3.70%
2.12%
4.24%
44,652
25,584
51,168
38,412
732
3,675,769
0.435
1,598,599
0
1,629
1.91%
0.00%
4.24%
22,997
0
51,168
38,412
125
3,675,769
0.435
1,598,599
0
814
0.33%
0.00%
2.12%
3,929
0
25,584
38,412
0
3,675,769
0.435
1,598,599
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 6 of 114
December 2016

-------
E.l - All Disinfection Types







90% CI on Number of UCMR 2 EPs
Percentage of
90% CI on Percentage of EPs with

90% CI on Number of EPs with



Number of



with Predicted Mean Exceeding
EPs with
Predicted Mean Exceeding
Total Number of EPs
Mean Exceeding Threshold -
Source Water Type
Threshold (ng/L)
Total
Number of
UCMR2 EPs with
Predicted Mean
National #
Systems
EP Ratio
National Number
of EPs
Threshold
Predicted Mean
Exceeding
Threshold - National Extrapolation
with Mean
Exceeding Threshold
National Extrapolation


UCMR2 EPs
Exceeding



Threshold -


- National





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)

0.6
1,124
158
2,812
3.987
11,213
116
212
14.06%
10.32%
18.86%
1,879
1,404
2,464

2
1,124
58
2,812
3.987
11,213
41
77
5.14%
3.65%
6.85%
748
538
982

6
1,124
15
2,812
3.987
11,213
8
25
1.36%
0.71%
2.22%
169
68
299

10
1,124
8
2,812
3.987
11,213
4
13
0.68%
0.36%
1.16%
71
26
131
All EPs Only
20
1,124
3
2,812
3.987
11,213
1
5
0.28%
0.09%
0.44%
22
6
34

60
1,124
0
2,812
3.987
11,213
0
1
0.02%
0.00%
0.09%
1
0
6

100
1,124
0
2,812
3.987
11,213
0
0
0.00%
0.00%
0.00%
0
0
0

200
1,124
0
2,812
3.987
11,213
0
0
0.00%
0.00%
0.00%
0
0
0

600
1,124
0
2,812
3.987
11,213
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
153
47
732
1.275
933
37
60
30.96%
24.18%
39.22%
289
226
366

2
153
20
732
1.275
933
16
25
13.19%
10.46%
16.34%
123
98
153

6
153
8
732
1.275
933
5
11
5.00%
3.27%
7.19%
47
31
67
EPs Only at Surface
Water Systems
10
153
4
732
1.275
933
3
7
2.87%
1.96%
4.58%
27
18
43
20
153
2
732
1.275
933
1
3
1.44%
0.65%
1.96%
13
6
18
60
153
0
732
1.275
933
0
1
0.11%
0.00%
0.65%
1
0
6

100
153
0
732
1.275
933
0
0
0.01%
0.00%
0.00%
0
0
0

200
153
0
732
1.275
933
0
0
0.00%
0.00%
0.00%
0
0
0

600
153
0
732
1.275
933
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
770
57
1,288
4.724
6,084
38
84
7.46%
4.94%
10.91%
454
300
664

2
770
13
1,288
4.724
6,084
7
21
1.74%
0.91%
2.73%
106
55
166

6
770
3
1,288
4.724
6,084
2
5
0.38%
0.26%
0.65%
23
16
40
EPs Only at Ground
Water Systems
10
770
2
1,288
4.724
6,084
1
3
0.26%
0.13%
0.39%
16
8
24
20
770
1
1,288
4.724
6,084
0
2
0.11%
0.00%
0.26%
7
0
16
60
770
0
1,288
4.724
6,084
0
0
0.00%
0.00%
0.00%
0
0
0

100
770
0
1,288
4.724
6,084
0
0
0.00%
0.00%
0.00%
0
0
0

200
770
0
1,288
4.724
6,084
0
0
0.00%
0.00%
0.00%
0
0
0

600
770
0
1,288
4.724
6,084
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
201
53
792
5.297
4,195
41
68
26.50%
20.40%
33.83%
1,136
878
1,434

2
201
24
792
5.297
4,195
18
31
12.06%
8.96%
15.42%
519
385
663

6
201
5
792
5.297
4,195
1
9
2.31%
0.50%
4.48%
99
21
193
EPs Only at
10
201
1
792
5.297
4,195
0
3
0.67%
0.00%
1.49%
29
0
64
Mixed Water
20
201
0
792
5.297
4,195
0
0
0.03%
0.00%
0.00%
1
0
0
Systems
60
201
0
792
5.297
4,195
0
0
0.00%
0.00%
0.00%
0
0
0

100
201
0
792
5.297
4,195
0
0
0.00%
0.00%
0.00%
0
0
0

200
201
0
792
5.297
4,195
0
0
0.00%
0.00%
0.00%
0
0
0

600
201
0
792
5.297
4,195
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 7 of 114
December 2016

-------
E.l - All Disinfection Types
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
8,477,045
1,672,677
84,318,927
0.597
50,343,187
1,218,526
2,257,699
19.73%
14.37%
26.63%
10,016,990
7,203,225
13,572,188
8,477,045
654,831
84,318,927
0.597
50,343,187
454,026
902,595
7.72%
5.36%
10.65%
3,983,040
2,877,539
5,496,746
8,477,045
209,159
84,318,927
0.597
50,343,187
111,831
334,937
2.47%
1.32%
3.95%
1,274,762
507,681
2,115,131
8,477,045
114,160
84,318,927
0.597
50,343,187
62,581
184,194
1.35%
0.74%
2.17%
613,278
243,448
1,142,926
8,477,045
43,216
84,318,927
0.597
50,343,187
6,801
67,281
0.51%
0.08%
0.79%
179,266
25,863
266,773
8,477,045
1,415
84,318,927
0.597
50,343,187
0
6,801
0.02%
0.00%
0.08%
5,492
0
25,863
8,477,045
85
84,318,927
0.597
50,343,187
0
0
0.00%
0.00%
0.00%
334
0
0
8,477,045
0
84,318,927
0.597
50,343,187
0
0
0.00%
0.00%
0.00%
0
0
0
8,477,045
0
84,318,927
0.597
50,343,187
0
0
0.00%
0.00%
0.00%
0
0
0
2,638,844
919,579
24,488,354
0.510
12,483,667
730,851
1,141,872
34.85%
27.70%
43.27%
4,091,654
3,223,142
5,169,102
2,638,844
402,728
24,488,354
0.510
12,483,667
297,988
522,807
15.26%
11.29%
19.81%
1,736,397
1,281,624
2,266,344
2,638,844
142,681
24,488,354
0.510
12,483,667
95,942
216,904
5.41%
3.64%
8.22%
613,534
364,873
960,204
2,638,844
84,917
24,488,354
0.510
12,483,667
57,881
118,555
3.22%
2.19%
4.49%
341,732
220,123
547,147
2,638,844
37,730
24,488,354
0.510
12,483,667
6,801
57,881
1.43%
0.26%
2.19%
144,211
25,863
220,123
2,638,844
1,318
24,488,354
0.510
12,483,667
0
6,801
0.05%
0.00%
0.26%
5,012
0
25,863
2,638,844
76
24,488,354
0.510
12,483,667
0
0
0.00%
0.00%
0.00%
291
0
0
2,638,844
0
24,488,354
0.510
12,483,667
0
0
0.00%
0.00%
0.00%
0
0
0
2,638,844
0
24,488,354
0.510
12,483,667
0
0
0.00%
0.00%
0.00%
0
0
0
4,636,297
447,502
33,342,501
0.658
21,945,383
271,278
691,079
9.65%
5.85%
14.91%
1,946,137
1,189,367
2,983,228
4,636,297
119,208
33,342,501
0.658
21,945,383
53,508
196,384
2.57%
1.15%
4.24%
505,445
231,603
827,935
4,636,297
21,383
33,342,501
0.658
21,945,383
9,400
46,659
0.46%
0.20%
1.01%
95,326
46,650
197,615
4,636,297
10,749
33,342,501
0.658
21,945,383
4,700
25,661
0.23%
0.10%
0.55%
51,248
23,325
110,399
4,636,297
4,197
33,342,501
0.658
21,945,383
0
9,400
0.09%
0.00%
0.20%
20,768
0
46,650
4,636,297
97
33,342,501
0.658
21,945,383
0
0
0.00%
0.00%
0.00%
480
0
0
4,636,297
9
33,342,501
0.658
21,945,383
0
0
0.00%
0.00%
0.00%
44
0
0
4,636,297
0
33,342,501
0.658
21,945,383
0
0
0.00%
0.00%
0.00%
0
0
0
4,636,297
0
33,342,501
0.658
21,945,383
0
0
0.00%
0.00%
0.00%
0
0
0
1,201,904
305,596
26,488,072
0.601
15,914,137
216,397
424,748
25.43%
18.00%
35.34%
3,979,198
2,790,716
5,419,858
1,201,904
132,894
26,488,072
0.601
15,914,137
102,530
183,403
11.06%
8.53%
15.26%
1,741,198
1,364,313
2,402,466
1,201,904
45,095
26,488,072
0.601
15,914,137
6,489
71,374
3.75%
0.54%
5.94%
565,902
96,158
957,312
1,201,904
18,495
26,488,072
0.601
15,914,137
0
39,978
1.54%
0.00%
3.33%
220,298
0
485,380
1,201,904
1,289
26,488,072
0.601
15,914,137
0
0
0.11%
0.00%
0.00%
14,288
0
0
1,201,904
0
26,488,072
0.601
15,914,137
0
0
0.00%
0.00%
0.00%
0
0
0
1,201,904
0
26,488,072
0.601
15,914,137
0
0
0.00%
0.00%
0.00%
0
0
0
1,201,904
0
26,488,072
0.601
15,914,137
0
0
0.00%
0.00%
0.00%
0
0
0
1,201,904
0
26,488,072
0.601
15,914,137
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 8 of 114
December 2016

-------
E.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total Number of
UCMR2 MRs
Number of
UCMR2 MRs with
Predicted Mean
Exceeding
Threshold
National #
Systems
MR Ratio
National Number
of MRs
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
All MRs Only
0.6
544
156
2,812
1.858
5,226
120
197
28.64%
22.06%
36.21%
1,714
1,320
2,132
2
544
60
2,812
1.858
5,226
45
77
11.02%
8.27%
14.15%
675
498
864
6
544
20
2,812
1.858
5,226
12
30
3.63%
2.21%
5.51%
211
119
343
10
544
9
2,812
1.858
5,226
3
14
1.61%
0.55%
2.57%
85
18
148
20
544
2
2,812
1.858
5,226
0
4
0.32%
0.00%
0.74%
11
0
24
60
544
0
2,812
1.858
5,226
0
0
0.00%
0.00%
0.00%
0
0
0
100
544
0
2,812
1.858
5,226
0
0
0.00%
0.00%
0.00%
0
0
0
200
544
0
2,812
1.858
5,226
0
0
0.00%
0.00%
0.00%
0
0
0
600
544
0
2,812
1.858
5,226
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
145
66
732
1.208
885
56
78
45.47%
38.62%
53.79%
402
342
476
2
145
31
732
1.208
885
26
38
21.72%
17.93%
26.21%
192
159
232
6
145
12
732
1.208
885
9
16
8.54%
6.21%
11.03%
76
55
98
10
145
6
732
1.208
885
3
9
4.32%
2.07%
6.21%
38
18
55
20
145
2
732
1.208
885
0
4
1.13%
0.00%
2.76%
10
0
24
60
145
0
732
1.208
885
0
0
0.01%
0.00%
0.00%
0
0
0
100
145
0
732
1.208
885
0
0
0.00%
0.00%
0.00%
0
0
0
200
145
0
732
1.208
885
0
0
0.00%
0.00%
0.00%
0
0
0
600
145
0
732
1.208
885
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Ground Water
Systems
0.6
311
45
1,288
1.908
2,457
29
66
14.57%
9.32%
21.22%
358
229
522
2
311
9
1,288
1.908
2,457
5
15
3.01%
1.61%
4.82%
74
40
119
6
311
2
1,288
1.908
2,457
0
4
0.52%
0.00%
1.29%
13
0
32
10
311
0
1,288
1.908
2,457
0
1
0.14%
0.00%
0.32%
4
0
8
20
311
0
1,288
1.908
2,457
0
0
0.01%
0.00%
0.00%
0
0
0
60
311
0
1,288
1.908
2,457
0
0
0.00%
0.00%
0.00%
0
0
0
100
311
0
1,288
1.908
2,457
0
0
0.00%
0.00%
0.00%
0
0
0
200
311
0
1,288
1.908
2,457
0
0
0.00%
0.00%
0.00%
0
0
0
600
311
0
1,288
1.908
2,457
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
88
45
792
2.378
1,883
35
53
50.64%
39.77%
60.23%
954
749
1,134
2
88
19
792
2.378
1,883
14
24
21.70%
15.91%
27.27%
409
300
514
6
88
6
792
2.378
1,883
3
10
6.52%
3.41%
11.36%
123
64
214
10
88
2
792
2.378
1,883
0
4
2.30%
0.00%
4.55%
43
0
86
20
88
0
792
2.378
1,883
0
0
0.07%
0.00%
0.00%
1
0
0
60
88
0
792
2.378
1,883
0
0
0.00%
0.00%
0.00%
0
0
0
100
88
0
792
2.378
1,883
0
0
0.00%
0.00%
0.00%
0
0
0
200
88
0
792
2.378
1,883
0
0
0.00%
0.00%
0.00%
0
0
0
600
88
0
792
2.378
1,883
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 9 of 114
December 2016

-------
E.l - All Disinfection Types
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served by
MRs with Mean
Exceeding Threshold
- National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
5,551,969
2,023,786
84,318,927
0.380
32,076,145
1,564,049
2,577,088
36.45%
28.17%
46.42%
11,823,834
9,076,604
15,077,807
5,551,969
900,705
84,318,927
0.380
32,076,145
685,996
1,161,235
16.22%
12.36%
20.92%
5,300,456
4,081,893
6,711,723
5,551,969
340,937
84,318,927
0.380
32,076,145
193,956
495,967
6.14%
3.49%
8.93%
2,007,871
1,167,243
3,016,414
5,551,969
148,671
84,318,927
0.380
32,076,145
57,881
272,188
2.68%
1.04%
4.90%
862,281
220,123
1,596,737
5,551,969
29,831
84,318,927
0.380
32,076,145
0
68,783
0.54%
0.00%
1.24%
135,846
0
357,864
5,551,969
176
84,318,927
0.380
32,076,145
0
0
0.00%
0.00%
0.00%
671
0
0
5,551,969
0
84,318,927
0.380
32,076,145
0
0
0.00%
0.00%
0.00%
0
0
0
5,551,969
0
84,318,927
0.380
32,076,145
0
0
0.00%
0.00%
0.00%
0
0
0
5,551,969
0
84,318,927
0.380
32,076,145
0
0
0.00%
0.00%
0.00%
0
0
0
2,549,091
1,215,331
24,488,354
0.493
12,080,736
1,030,271
1,433,689
47.68%
40.42%
56.24%
5,393,298
4,513,617
6,409,777
2,549,091
598,039
24,488,354
0.493
12,080,736
474,858
722,325
23.46%
18.63%
28.34%
2,547,410
1,988,674
3,110,223
2,549,091
241,997
24,488,354
0.493
12,080,736
153,978
319,302
9.49%
6.04%
12.53%
1,044,880
681,863
1,362,683
2,549,091
114,613
24,488,354
0.493
12,080,736
57,881
189,077
4.50%
2.27%
7.42%
517,794
220,123
854,378
2,549,091
28,561
24,488,354
0.493
12,080,736
0
68,783
1.12%
0.00%
2.70%
123,765
0
357,864
2,549,091
176
24,488,354
0.493
12,080,736
0
0
0.01%
0.00%
0.00%
671
0
0
2,549,091
0
24,488,354
0.493
12,080,736
0
0
0.00%
0.00%
0.00%
0
0
0
2,549,091
0
24,488,354
0.493
12,080,736
0
0
0.00%
0.00%
0.00%
0
0
0
2,549,091
0
24,488,354
0.493
12,080,736
0
0
0.00%
0.00%
0.00%
0
0
0
2,385,671
497,901
33,342,501
0.334
11,130,020
287,927
759,331
20.87%
12.07%
31.83%
2,124,625
1,226,902
3,253,279
2,385,671
130,984
33,342,501
0.334
11,130,020
65,733
239,695
5.49%
2.76%
10.05%
530,810
260,523
966,891
2,385,671
29,150
33,342,501
0.334
11,130,020
0
64,042
1.22%
0.00%
2.68%
114,481
0
252,129
2,385,671
7,615
33,342,501
0.334
11,130,020
0
30,458
0.32%
0.00%
1.28%
29,854
0
119,401
2,385,671
336
33,342,501
0.334
11,130,020
0
0
0.01%
0.00%
0.00%
1,317
0
0
2,385,671
0
33,342,501
0.334
11,130,020
0
0
0.00%
0.00%
0.00%
0
0
0
2,385,671
0
33,342,501
0.334
11,130,020
0
0
0.00%
0.00%
0.00%
0
0
0
2,385,671
0
33,342,501
0.334
11,130,020
0
0
0.00%
0.00%
0.00%
0
0
0
2,385,671
0
33,342,501
0.334
11,130,020
0
0
0.00%
0.00%
0.00%
0
0
0
617,208
310,555
26,488,072
0.335
8,865,389
245,851
384,067
50.32%
39.83%
62.23%
4,305,911
3,336,085
5,414,750
617,208
171,681
26,488,072
0.335
8,865,389
145,405
199,215
27.82%
23.56%
32.28%
2,222,236
1,832,696
2,634,609
617,208
69,790
26,488,072
0.335
8,865,389
39,978
112,623
11.31%
6.48%
18.25%
848,509
485,380
1,401,603
617,208
26,444
26,488,072
0.335
8,865,389
0
52,653
4.28%
0.00%
8.53%
314,633
0
622,958
617,208
934
26,488,072
0.335
8,865,389
0
0
0.15%
0.00%
0.00%
10,764
0
0
617,208
0
26,488,072
0.335
8,865,389
0
0
0.00%
0.00%
0.00%
0
0
0
617,208
0
26,488,072
0.335
8,865,389
0
0
0.00%
0.00%
0.00%
0
0
0
617,208
0
26,488,072
0.335
8,865,389
0
0
0.00%
0.00%
0.00%
0
0
0
617,208
0
26,488,072
0.335
8,865,389
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 10 of 114
December 2016

-------
E.l - All Disinfection Types







90% CI on Number of UCMR 2 EPs
Percentage of
90% CI on Percentage of EPs with

90% CI on Number of EPs with



Number of



with Predicted Mean Exceeding
EPs with
Predicted Mean Exceeding
Total Number of EPs
Mean Exceeding Threshold -
Source Water Type
Threshold (ng/L)
Total
Number of
UCMR2 EPs with
Predicted Mean
National #
Systems
EP Ratio
National Number
of EPs
Threshold
Predicted Mean
Exceeding
Threshold - National Extrapolation
with Mean
Exceeding Threshold
National Extrapolation


UCMR2 EPs
Exceeding



Threshold -


- National





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
2,865
449
398
7.015
2,792
362
554
15.68%
12.64%
19.35%
442
360
541

2
2,865
135
398
7.015
2,792
109
168
4.72%
3.80%
5.86%
135
109
166

6
2,865
33
398
7.015
2,792
22
46
1.15%
0.77%
1.61%
33
22
46

10
2,865
17
398
7.015
2,792
11
25
0.59%
0.38%
0.87%
17
11
25
All EPs Only
20
2,865
5
398
7.015
2,792
1
9
0.17%
0.03%
0.31%
5
1
9

60
2,865
0
398
7.015
2,792
0
1
0.01%
0.00%
0.03%
0
0
1

100
2,865
0
398
7.015
2,792
0
0
0.00%
0.00%
0.01%
0
0
0

200
2,865
0
398
7.015
2,792
0
0
0.00%
0.00%
0.00%
0
0
0

600
2,865
0
398
7.015
2,792
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
400
115
218
1.835
400
97
136
28.70%
24.25%
34.00%
115
97
136

2
400
50
218
1.835
400
42
59
12.47%
10.50%
14.75%
50
42
59

6
400
16
218
1.835
400
11
21
4.00%
2.75%
5.25%
16
11
21
EPs Only at Surface
Water Systems
10
400
9
218
1.835
400
6
12
2.15%
1.50%
3.00%
9
6
12
20
400
3
218
1.835
400
1
5
0.77%
0.25%
1.25%
3
1
5
60
400
0
218
1.835
400
0
1
0.10%
0.00%
0.25%
0
0
1

100
400
0
218
1.835
400
0
0
0.01%
0.00%
0.09%
0
0
0

200
400
0
218
1.835
400
0
0
0.00%
0.00%
0.00%
0
0
0

600
400
0
218
1.835
400
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1,042
87
72
14.472
1,042
59
122
8.32%
5.66%
11.71%
87
59
122

2
1,042
8
72
14.472
1,042
3
15
0.76%
0.29%
1.44%
8
3
15

6
1,042
0
72
14.472
1,042
0
2
0.05%
0.00%
0.19%
0
0
2
EPs Only at Ground
Water Systems
10
1,042
0
72
14.472
1,042
0
1
0.01%
0.00%
0.10%
0
0
1
20
1,042
0
72
14.472
1,042
0
0
0.00%
0.00%
0.00%
0
0
0
60
1,042
0
72
14.472
1,042
0
0
0.00%
0.00%
0.00%
0
0
0

100
1,042
0
72
14.472
1,042
0
0
0.00%
0.00%
0.00%
0
0
0

200
1,042
0
72
14.472
1,042
0
0
0.00%
0.00%
0.00%
0
0
0

600
1,042
0
72
14.472
1,042
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1,423
248
108
12.500
1,350
206
296
17.40%
14.48%
20.83%
241
204
283

2
1,423
78
108
12.500
1,350
64
94
5.45%
4.50%
6.61%
77
64
92

6
1,423
17
108
12.500
1,350
11
23
1.16%
0.77%
1.62%
17
11
23
EPs Only at
10
1,423
8
108
12.500
1,350
5
12
0.58%
0.35%
0.84%
8
5
12
Mixed Water
20
1,423
2
108
12.500
1,350
0
4
0.12%
0.00%
0.28%
2
0
4
Systems
60
1,423
0
108
12.500
1,350
0
0
0.00%
0.00%
0.00%
0
0
0

100
1,423
0
108
12.500
1,350
0
0
0.00%
0.00%
0.00%
0
0
0

200
1,423
0
108
12.500
1,350
0
0
0.00%
0.00%
0.00%
0
0
0

600
1,423
0
108
12.500
1,350
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 11 of 114
December 2016

-------
E.l - All Disinfection Types
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
79,782,373
18,803,844
141,981,684
0.559
79,385,608
14,472,981
24,981,422
23.57%
18.14%
31.31%
18,783,597
14,467,483
24,940,184
79,782,373
6,668,339
141,981,684
0.559
79,385,608
5,068,397
8,450,290
8.36%
6.35%
10.59%
6,667,394
5,068,397
8,444,791
79,782,373
1,965,606
141,981,684
0.559
79,385,608
1,383,821
2,827,021
2.46%
1.73%
3.54%
1,965,606
1,383,821
2,827,021
79,782,373
1,089,270
141,981,684
0.559
79,385,608
717,644
1,551,734
1.37%
0.90%
1.94%
1,089,270
717,644
1,551,734
79,782,373
384,704
141,981,684
0.559
79,385,608
50,942
727,379
0.48%
0.06%
0.91%
384,704
50,942
727,379
79,782,373
27,658
141,981,684
0.559
79,385,608
0
50,942
0.03%
0.00%
0.06%
27,658
0
50,942
79,782,373
2,916
141,981,684
0.559
79,385,608
0
17,830
0.00%
0.00%
0.02%
2,916
0
17,830
79,782,373
0
141,981,684
0.559
79,385,608
0
0
0.00%
0.00%
0.00%
0
0
0
79,782,373
0
141,981,684
0.559
79,385,608
0
0
0.00%
0.00%
0.00%
0
0
0
46,706,020
13,086,865
89,237,751
0.523
46,706,020
10,194,147
17,144,022
28.02%
21.83%
36.71%
13,086,865
10,194,147
17,144,022
46,706,020
4,853,663
89,237,751
0.523
46,706,020
3,769,769
6,061,668
10.39%
8.07%
12.98%
4,853,663
3,769,769
6,061,668
46,706,020
1,509,997
89,237,751
0.523
46,706,020
1,067,338
2,067,322
3.23%
2.29%
4.43%
1,509,997
1,067,338
2,067,322
46,706,020
829,293
89,237,751
0.523
46,706,020
532,713
1,210,759
1.78%
1.14%
2.59%
829,293
532,713
1,210,759
46,706,020
321,889
89,237,751
0.523
46,706,020
50,942
605,227
0.69%
0.11%
1.30%
321,889
50,942
605,227
46,706,020
27,658
89,237,751
0.523
46,706,020
0
50,942
0.06%
0.00%
0.11%
27,658
0
50,942
46,706,020
2,916
89,237,751
0.523
46,706,020
0
17,830
0.01%
0.00%
0.04%
2,916
0
17,830
46,706,020
0
89,237,751
0.523
46,706,020
0
0
0.00%
0.00%
0.00%
0
0
0
46,706,020
0
89,237,751
0.523
46,706,020
0
0
0.00%
0.00%
0.00%
0
0
0
11,632,265
1,109,340
18,472,835
0.630
11,632,265
535,153
2,108,625
9.54%
4.60%
18.13%
1,109,340
535,153
2,108,625
11,632,265
207,127
18,472,835
0.630
11,632,265
40,051
396,101
1.78%
0.34%
3.41%
207,127
40,051
396,101
11,632,265
16,354
18,472,835
0.630
11,632,265
0
114,182
0.14%
0.00%
0.98%
16,354
0
114,182
11,632,265
1,561
18,472,835
0.630
11,632,265
0
2,196
0.01%
0.00%
0.02%
1,561
0
2,196
11,632,265
0
18,472,835
0.630
11,632,265
0
0
0.00%
0.00%
0.00%
0
0
0
11,632,265
0
18,472,835
0.630
11,632,265
0
0
0.00%
0.00%
0.00%
0
0
0
11,632,265
0
18,472,835
0.630
11,632,265
0
0
0.00%
0.00%
0.00%
0
0
0
11,632,265
0
18,472,835
0.630
11,632,265
0
0
0.00%
0.00%
0.00%
0
0
0
11,632,265
0
18,472,835
0.630
11,632,265
0
0
0.00%
0.00%
0.00%
0
0
0
21,444,088
4,607,639
34,271,098
0.614
21,047,322
3,743,682
5,728,775
21.49%
17.46%
26.71%
4,587,391
3,738,183
5,687,536
21,444,088
1,607,548
34,271,098
0.614
21,047,322
1,258,576
1,992,521
7.50%
5.87%
9.29%
1,606,603
1,258,576
1,987,023
21,444,088
439,256
34,271,098
0.614
21,047,322
316,482
645,517
2.05%
1.48%
3.01%
439,256
316,482
645,517
21,444,088
258,416
34,271,098
0.614
21,047,322
184,932
338,778
1.21%
0.86%
1.58%
258,416
184,932
338,778
21,444,088
62,816
34,271,098
0.614
21,047,322
0
122,152
0.29%
0.00%
0.57%
62,816
0
122,152
21,444,088
0
34,271,098
0.614
21,047,322
0
0
0.00%
0.00%
0.00%
0
0
0
21,444,088
0
34,271,098
0.614
21,047,322
0
0
0.00%
0.00%
0.00%
0
0
0
21,444,088
0
34,271,098
0.614
21,047,322
0
0
0.00%
0.00%
0.00%
0
0
0
21,444,088
0
34,271,098
0.614
21,047,322
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 12 of 114
December 2016

-------
E.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total Number of
UCMR2 MRs
Number of
UCMR2 MRs with
Predicted Mean
Exceeding
Threshold
National #
Systems
MR Ratio
National Number
of MRs
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All MRs Only
0.6
1,350
471
398
3.384
1,347
401
554
34.89%
29.70%
41.04%
469
400
551
2
1,350
222
398
3.384
1,347
194
255
16.45%
14.37%
18.89%
222
194
253
6
1,350
63
398
3.384
1,347
50
79
4.69%
3.70%
5.85%
63
50
79
10
1,350
31
398
3.384
1,347
21
42
2.29%
1.56%
3.11%
31
21
42
20
1,350
8
398
3.384
1,347
3
14
0.59%
0.22%
1.04%
8
3
14
60
1,350
1
398
3.384
1,347
0
1
0.05%
0.00%
0.07%
1
0
1
100
1,350
0
398
3.384
1,347
0
1
0.01%
0.00%
0.07%
0
0
1
200
1,350
0
398
3.384
1,347
0
0
0.00%
0.00%
0.00%
0
0
0
600
1,350
0
398
3.384
1,347
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
367
175
218
1.683
367
156
198
47.68%
42.51%
53.95%
175
156
198
2
367
99
218
1.683
367
89
110
26.90%
24.25%
29.97%
99
89
110
6
367
28
218
1.683
367
23
34
7.63%
6.27%
9.26%
28
23
34
10
367
13
218
1.683
367
9
17
3.61%
2.45%
4.63%
13
9
17
20
367
3
218
1.683
367
1
6
0.92%
0.27%
1.63%
3

6
60
367
1
218
1.683
367
0
1
0.18%
0.00%
0.27%
1
0
1
100
367
0
218
1.683
367
0
1
0.04%
0.00%
0.27%
0
0
1
200
367
0
218
1.683
367
0
0
0.00%
0.00%
0.00%
0
0
0
600
367
0
218
1.683
367
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Ground Water
Systems
0.6
490
78
72
6.806
490
51
112
15.89%
10.41%
22.86%
78
51
112
2
490
11
72
6.806
490
6
17
2.17%
1.22%
3.47%
11
6
17
6
490
1
72
6.806
490
0
2
0.14%
0.00%
0.41%
1
0
2
10
490
0
72
6.806
490
0
1
0.01%
0.00%
0.20%
0
0
1
20
490
0
72
6.806
490
0
0
0.00%
0.00%
0.00%
0
0
0
60
490
0
72
6.806
490
0
0
0.00%
0.00%
0.00%
0
0
0
100
490
0
72
6.806
490
0
0
0.00%
0.00%
0.00%
0
0
0
200
490
0
72
6.806
490
0
0
0.00%
0.00%
0.00%
0
0
0
600
490
0
72
6.806
490
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
493
218
108
4.537
490
194
244
44.27%
39.35%
49.49%
216
193
241
2
493
113
108
4.537
490
99
128
22.87%
20.08%
25.96%
112
99
126
6
493
35
108
4.537
490
27
43
7.03%
5.48%
8.72%
35
27
43
10
493
18
108
4.537
490
12
24
3.57%
2.43%
4.87%
18
12
24
20
493
5
108
4.537
490
2
8
0.94%
0.41%
1.62%
5
2
8
60
493
0
108
4.537
490
0
0
0.00%
0.00%
0.00%
0
0
0
100
493
0
108
4.537
490
0
0
0.00%
0.00%
0.00%
0
0
0
200
493
0
108
4.537
490
0
0
0.00%
0.00%
0.00%
0
0
0
600
493
0
108
4.537
490
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 13 of 114
December 2016

-------
E.l - All Disinfection Types
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served by
MRs with Mean
Exceeding Threshold
- National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
62,199,311
29,002,748
141,981,684
0.438
62,190,368
23,901,023
35,205,019
46.63%
38.43%
56.60%
28,997,045
23,898,274
35,196,076
62,199,311
14,791,450
141,981,684
0.438
62,190,368
12,402,650
17,939,984
23.78%
19.94%
28.84%
14,789,849
12,402,650
17,934,485
62,199,311
3,711,272
141,981,684
0.438
62,190,368
2,753,332
5,632,631
5.97%
4.43%
9.06%
3,711,241
2,753,332
5,632,631
62,199,311
1,781,638
141,981,684
0.438
62,190,368
1,183,859
2,432,301
2.86%
1.90%
3.91%
1,781,638
1,183,859
2,432,301
62,199,311
487,127
141,981,684
0.438
62,190,368
99,121
947,265
0.78%
0.16%
1.52%
487,127
99,121
947,265
62,199,311
34,949
141,981,684
0.438
62,190,368
0
50,942
0.06%
0.00%
0.08%
34,949
0
50,942
62,199,311
8,395
141,981,684
0.438
62,190,368
0
50,942
0.01%
0.00%
0.08%
8,395
0
50,942
62,199,311
0
141,981,684
0.438
62,190,368
0
0
0.00%
0.00%
0.00%
0
0
0
62,199,311
0
141,981,684
0.438
62,190,368
0
0
0.00%
0.00%
0.00%
0
0
0
42,531,731
21,191,954
89,237,751
0.477
42,531,731
17,697,099
25,606,141
49.83%
41.61%
60.20%
21,191,954
17,697,099
25,606,141
42,531,731
10,961,017
89,237,751
0.477
42,531,731
9,314,897
13,123,302
25.77%
21.90%
30.86%
10,961,017
9,314,897
13,123,302
42,531,731
2,555,824
89,237,751
0.477
42,531,731
1,948,411
3,860,365
6.01%
4.58%
9.08%
2,555,824
1,948,411
3,860,365
42,531,731
1,208,434
89,237,751
0.477
42,531,731
792,803
1,624,566
2.84%
1.86%
3.82%
1,208,434
792,803
1,624,566
42,531,731
319,791
89,237,751
0.477
42,531,731
50,942
651,375
0.75%
0.12%
1.53%
319,791
50,942
651,375
42,531,731
34,533
89,237,751
0.477
42,531,731
0
50,942
0.08%
0.00%
0.12%
34,533
0
50,942
42,531,731
8,395
89,237,751
0.477
42,531,731
0
50,942
0.02%
0.00%
0.12%
8,395
0
50,942
42,531,731
0
89,237,751
0.477
42,531,731
0
0
0.00%
0.00%
0.00%
0
0
0
42,531,731
0
89,237,751
0.477
42,531,731
0
0
0.00%
0.00%
0.00%
0
0
0
6,840,570
2,345,286
18,472,835
0.370
6,840,570
1,567,665
3,000,714
34.28%
22.92%
43.87%
2,345,286
1,567,665
3,000,714
6,840,570
974,916
18,472,835
0.370
6,840,570
607,571
1,532,122
14.25%
8.88%
22.40%
974,916
607,571
1,532,122
6,840,570
105,179
18,472,835
0.370
6,840,570
0
437,685
1.54%
0.00%
6.40%
105,179
0
437,685
6,840,570
11,295
18,472,835
0.370
6,840,570
0
50,425
0.17%
0.00%
0.74%
11,295
0
50,425
6,840,570
0
18,472,835
0.370
6,840,570
0
0
0.00%
0.00%
0.00%
0
0
0
6,840,570
0
18,472,835
0.370
6,840,570
0
0
0.00%
0.00%
0.00%
0
0
0
6,840,570
0
18,472,835
0.370
6,840,570
0
0
0.00%
0.00%
0.00%
0
0
0
6,840,570
0
18,472,835
0.370
6,840,570
0
0
0.00%
0.00%
0.00%
0
0
0
6,840,570
0
18,472,835
0.370
6,840,570
0
0
0.00%
0.00%
0.00%
0
0
0
12,827,010
5,465,508
34,271,098
0.374
12,818,067
4,636,259
6,598,164
42.61%
36.14%
51.44%
5,459,805
4,633,510
6,589,221
12,827,010
2,855,518
34,271,098
0.374
12,818,067
2,480,182
3,284,559
22.26%
19.34%
25.61%
2,853,917
2,480,182
3,279,060
12,827,010
1,050,269
34,271,098
0.374
12,818,067
804,921
1,334,581
8.19%
6.28%
10.40%
1,050,238
804,921
1,334,581
12,827,010
561,908
34,271,098
0.374
12,818,067
391,056
757,310
4.38%
3.05%
5.90%
561,908
391,056
757,310
12,827,010
167,335
34,271,098
0.374
12,818,067
48,179
295,890
1.30%
0.38%
2.31%
167,335
48,179
295,890
12,827,010
416
34,271,098
0.374
12,818,067
0
0
0.00%
0.00%
0.00%
416
0
0
12,827,010
0
34,271,098
0.374
12,818,067
0
0
0.00%
0.00%
0.00%
0
0
0
12,827,010
0
34,271,098
0.374
12,818,067
0
0
0.00%
0.00%
0.00%
0
0
0
12,827,010
0
34,271,098
0.374
12,818,067
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 14 of 114
December 2016

-------
E.l - All Disinfection Types







90% CI on Number of UCMR 2 EPs
Percentage of
90% CI on Percentage of EPs with

90% CI on Number of EPs with



Number of



with Predicted Mean Exceeding
EPs with
Predicted Mean Exceeding
Total Number of EPs
Mean Exceeding Threshold -
Source Water Type
Threshold (ng/L)
Total
Number of
UCMR2 EPs with
Predicted Mean
National #
Systems
EP Ratio
National Number
of EPs
Threshold
Predicted Mean
Exceeding
Threshold - National Extrapolation
with Mean
Exceeding Threshold
National Extrapolation


UCMR2 EPs
Exceeding



Threshold -


- National





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
4,666
724
45,172
1.856
83,836
565
921
15.53%
12.11%
19.75%
8,271
5,259
12,213

2
4,666
241
45,172
1.856
83,836
184
306
5.17%
3.94%
6.57%
2,828
1,668
4,173

6
4,666
69
45,172
1.856
83,836
44
100
1.47%
0.94%
2.14%
879
502
1,473

10
4,666
38
45,172
1.856
83,836
23
55
0.81%
0.49%
1.19%
492
252
741
All EPs Only
20
4,666
14
45,172
1.856
83,836
5
26
0.31%
0.11%
0.56%
173
34
365

60
4,666
2
45,172
1.856
83,836
0
5
0.04%
0.00%
0.11%
15
0
34

100
4,666
0
45,172
1.856
83,836
0
1
0.01%
0.00%
0.03%
2
0
9

200
4,666
0
45,172
1.856
83,836
0
0
0.00%
0.00%
0.00%
0
0
0

600
4,666
0
45,172
1.856
83,836
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
785
233
2,936
1.161
3,409
192
282
29.69%
24.46%
35.92%
1,038
842
1,271

2
785
100
2,936
1.161
3,409
82
119
12.79%
10.45%
15.16%
445
354
525

6
785
37
2,936
1.161
3,409
26
50
4.74%
3.31%
6.37%
184
131
249
EPs Only at Surface
Water Systems
10
785
22
2,936
1.161
3,409
15
30
2.84%
1.91%
3.87%
119
78
156
20
785
11
2,936
1.161
3,409
5
17
1.34%
0.64%
2.17%
63
34
104
60
785
2
2,936
1.161
3,409
0
5
0.21%
0.00%
0.64%
11
0
34

100
785
0
2,936
1.161
3,409
0
1
0.04%
0.00%
0.17%
2
0
9

200
785
0
2,936
1.161
3,409
0
0
0.00%
0.00%
0.00%
0
0
0

600
785
0
2,936
1.161
3,409
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
2,211
164
39,885
1.784
71,174
105
242
7.41%
4.75%
10.95%
3,713
1,643
6,565

2
2,211
24
39,885
1.784
71,174
10
43
1.11%
0.45%
1.96%
621
58
1,361

6
2,211
4
39,885
1.784
71,174
2
8
0.16%
0.09%
0.36%
49
16
202
EPs Only at Ground
Water Systems
10
2,211
2
39,885
1.784
71,174
1
4
0.09%
0.05%
0.18%
19
8
25
20
2,211
1
39,885
1.784
71,174
0
2
0.04%
0.00%
0.09%
7
0
16
60
2,211
0
39,885
1.784
71,174
0
0
0.00%
0.00%
0.00%
0
0
0

100
2,211
0
39,885
1.784
71,174
0
0
0.00%
0.00%
0.00%
0
0
0

200
2,211
0
39,885
1.784
71,174
0
0
0.00%
0.00%
0.00%
0
0
0

600
2,211
0
39,885
1.784
71,174
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1,670
327
2,351
3.936
9,253
268
397
19.61%
16.05%
23.79%
3,519
2,774
4,377

2
1,670
116
2,351
3.936
9,253
92
144
6.96%
5.51%
8.62%
1,762
1,255
2,287

6
1,670
28
2,351
3.936
9,253
16
42
1.66%
0.96%
2.51%
646
355
1,022
EPs Only at
10
1,670
13
2,351
3.936
9,253
7
21
0.81%
0.42%
1.26%
354
166
560
Mixed Water
20
1,670
3
2,351
3.936
9,253
0
7
0.18%
0.00%
0.42%
103
0
246
Systems
60
1,670
0
2,351
3.936
9,253
0
0
0.00%
0.00%
0.00%
3
0
0

100
1,670
0
2,351
3.936
9,253
0
0
0.00%
0.00%
0.00%
0
0
0

200
1,670
0
2,351
3.936
9,253
0
0
0.00%
0.00%
0.00%
0
0
0

600
1,670
0
2,351
3.936
9,253
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 15 of 114
December 2016

-------
E.l - All Disinfection Types
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
88,936,169
20,630,382
267,455,451
0.583
155,937,382
15,803,342
27,443,731
23.20%
17.77%
30.86%
32,294,579
23,778,744
43,949,777
88,936,169
7,396,098
267,455,451
0.583
155,937,382
5,573,608
9,449,864
8.32%
6.27%
10.63%
11,912,875
8,603,998
16,120,658
88,936,169
2,205,623
267,455,451
0.583
155,937,382
1,515,727
3,210,635
2.48%
1.70%
3.61%
3,624,784
2,104,091
5,672,113
88,936,169
1,223,063
267,455,451
0.583
155,937,382
791,823
1,764,868
1.38%
0.89%
1.98%
1,919,909
1,059,720
3,051,086
88,936,169
438,156
267,455,451
0.583
155,937,382
62,356
812,603
0.49%
0.07%
0.91%
648,485
103,619
1,183,808
88,936,169
31,610
267,455,451
0.583
155,937,382
0
62,356
0.04%
0.00%
0.07%
49,063
0
103,619
88,936,169
3,725
267,455,451
0.583
155,937,382
0
21,130
0.00%
0.00%
0.02%
7,510
0
37,165
88,936,169
6
267,455,451
0.583
155,937,382
0
0
0.00%
0.00%
0.00%
36
0
0
88,936,169
0
267,455,451
0.583
155,937,382
0
0
0.00%
0.00%
0.00%
0
0
0
49,633,656
14,110,529
118,756,915
0.520
61,729,578
11,006,767
18,413,963
28.43%
22.18%
37.10%
17,966,515
14,017,398
23,322,275
49,633,656
5,310,078
118,756,915
0.520
61,729,578
4,108,829
6,648,040
10.70%
8.28%
13.39%
6,935,805
5,311,087
8,746,470
49,633,656
1,677,471
118,756,915
0.520
61,729,578
1,180,180
2,320,864
3.38%
2.38%
4.68%
2,277,751
1,534,887
3,261,487
49,633,656
930,560
118,756,915
0.520
61,729,578
601,050
1,352,597
1.87%
1.21%
2.73%
1,269,674
812,144
1,904,129
49,633,656
368,927
118,756,915
0.520
61,729,578
62,356
678,203
0.74%
0.13%
1.37%
520,185
103,619
918,829
49,633,656
31,478
118,756,915
0.520
61,729,578
0
62,356
0.06%
0.00%
0.13%
47,480
0
103,619
49,633,656
3,716
118,756,915
0.520
61,729,578
0
21,130
0.01%
0.00%
0.04%
7,466
0
37,165
49,633,656
6
118,756,915
0.520
61,729,578
0
0
0.00%
0.00%
0.00%
36
0
0
49,633,656
0
118,756,915
0.520
61,729,578
0
0
0.00%
0.00%
0.00%
0
0
0
16,608,066
1,575,953
84,263,597
0.654
55,143,632
814,307
2,837,502
9.49%
4.90%
17.09%
4,481,555
2,301,444
7,904,855
16,608,066
329,894
84,263,597
0.654
55,143,632
93,559
601,592
1.99%
0.56%
3.62%
992,796
271,654
1,986,269
16,608,066
37,953
84,263,597
0.654
55,143,632
9,400
162,766
0.23%
0.06%
0.98%
124,775
46,650
409,427
16,608,066
12,334
84,263,597
0.654
55,143,632
4,700
27,858
0.07%
0.03%
0.17%
54,165
23,325
112,595
16,608,066
4,197
84,263,597
0.654
55,143,632
0
9,400
0.03%
0.00%
0.06%
20,768
0
46,650
16,608,066
97
84,263,597
0.654
55,143,632
0
0
0.00%
0.00%
0.00%
480
0
0
16,608,066
9
84,263,597
0.654
55,143,632
0
0
0.00%
0.00%
0.00%
44
0
0
16,608,066
0
84,263,597
0.654
55,143,632
0
0
0.00%
0.00%
0.00%
0
0
0
16,608,066
0
84,263,597
0.654
55,143,632
0
0
0.00%
0.00%
0.00%
0
0
0
22,694,447
4,943,901
64,434,939
0.606
39,064,172
3,982,268
6,192,266
21.78%
17.55%
27.29%
9,846,509
7,459,902
12,722,647
22,694,447
1,756,125
64,434,939
0.606
39,064,172
1,371,221
2,200,232
7.74%
6.04%
9.70%
3,984,274
3,021,257
5,387,918
22,694,447
490,200
64,434,939
0.606
39,064,172
326,147
727,005
2.16%
1.44%
3.20%
1,222,258
522,554
2,001,198
22,694,447
280,168
64,434,939
0.606
39,064,172
186,073
384,413
1.23%
0.82%
1.69%
596,070
224,251
1,034,362
22,694,447
65,031
64,434,939
0.606
39,064,172
0
125,000
0.29%
0.00%
0.55%
107,532
0
218,329
22,694,447
35
64,434,939
0.606
39,064,172
0
0
0.00%
0.00%
0.00%
1,102
0
0
22,694,447
0
64,434,939
0.606
39,064,172
0
0
0.00%
0.00%
0.00%
0
0
0
22,694,447
0
64,434,939
0.606
39,064,172
0
0
0.00%
0.00%
0.00%
0
0
0
22,694,447
0
64,434,939
0.606
39,064,172
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 16 of 114
December 2016

-------
E.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total Number of
UCMR2 MRs
Number of
UCMR2 MRs with
Predicted Mean
Exceeding
Threshold
National #
Systems
MR Ratio
National Number
of MRs
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All MRs Only
0.6
2,397
775
45,172
1.106
49,942
638
937
32.35%
26.62%
39.09%
9,409
6,394
13,006
2
2,397
341
45,172
1.106
49,942
286
406
14.24%
11.93%
16.94%
3,169
2,195
4,577
6
2,397
109
45,172
1.106
49,942
81
143
4.53%
3.38%
5.97%
1,102
697
1,595
10
2,397
57
45,172
1.106
49,942
35
79
2.36%
1.46%
3.30%
601
281
898
20
2,397
20
45,172
1.106
49,942
11
32
0.82%
0.46%
1.34%
266
218
450
60
2,397
4
45,172
1.106
49,942
1
6
0.15%
0.04%
0.25%
153
81
189
100
2,397
1
45,172
1.106
49,942
0
4
0.06%
0.00%
0.17%
75
0
171
200
2,397
0
45,172
1.106
49,942
0
1
0.01%
0.00%
0.04%
12
0
81
600
2,397
0
45,172
1.106
49,942
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
738
337
2,936
1.115
3,273
294
388
45.64%
39.84%
52.57%
1,435
1,231
1,676
2
738
169
2,936
1.115
3,273
148
193
22.96%
20.05%
26.15%
642
543
744
6
738
58
2,936
1.115
3,273
46
73
7.87%
6.23%
9.89%
262
203
337
10
738
32
2,936
1.115
3,273
21
42
4.32%
2.85%
5.69%
162
108
215
20
738
13
2,936
1.115
3,273
7
20
1.74%
0.95%
2.71%
83
55
120
60
738
2
2,936
1.115
3,273
0
4
0.26%
0.00%
0.54%
12
0
28
100
738
0
2,936
1.115
3,273
0
2
0.06%
0.00%
0.27%
3
0
10
200
738
0
2,936
1.115
3,273
0
0
0.00%
0.00%
0.00%
0
0
0
600
738
0
2,936
1.115
3,273
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Ground Water
Systems
0.6
1,039
150
39,885
1.032
41,151
94
220
14.41%
9.05%
21.17%
4,704
2,527
7,375
2
1,039
24
39,885
1.032
41,151
12
41
2.28%
1.15%
3.95%
680
206
1,580
6
1,039
3
39,885
1.032
41,151
0
7
0.26%
0.00%
0.67%
71
0
194
10
1,039
1
39,885
1.032
41,151
0
2
0.05%
0.00%
0.19%
11
0
9
20
1,039
0
39,885
1.032
41,151
0
0
0.00%
0.00%
0.00%
0
0
0
60
1,039
0
39,885
1.032
41,151
0
0
0.00%
0.00%
0.00%
0
0
0
100
1,039
0
39,885
1.032
41,151
0
0
0.00%
0.00%
0.00%
0
0
0
200
1,039
0
39,885
1.032
41,151
0
0
0.00%
0.00%
0.00%
0
0
0
600
1,039
0
39,885
1.032
41,151
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
620
289
2,351
2.347
5,517
250
329
46.59%
40.32%
53.06%
3,270
2,635
3,955
2
620
148
2,351
2.347
5,517
126
172
23.92%
20.32%
27.74%
1,848
1,447
2,252
6
620
48
2,351
2.347
5,517
35
63
7.74%
5.65%
10.16%
770
494
1,063
10
620
24
2,351
2.347
5,517
14
35
3.90%
2.26%
5.65%
429
173
674
20
620
7
2,351
2.347
5,517
4
12
1.11%
0.65%
1.94%
182
163
330
60
620
2
2,351
2.347
5,517
1
2
0.28%
0.16%
0.32%
141
81
161
100
620
1
2,351
2.347
5,517
0
2
0.14%
0.00%
0.32%
72
0
161
200
620
0
2,351
2.347
5,517
0
1
0.02%
0.00%
0.16%
12
0
81
600
620
0
2,351
2.347
5,517
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 17 of 114
December 2016

-------
E.l - All Disinfection Types
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served by
MRs with Mean
Exceeding Threshold
- National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
68,283,451
31,210,054
267,455,451
0.408
109,249,964
25,606,229
38,015,885
45.71%
37.50%
55.67%
44,108,257
35,106,349
55,072,825
68,283,451
15,776,830
267,455,451
0.408
109,249,964
13,153,267
19,207,912
23.10%
19.26%
28.13%
21,264,681
17,219,302
26,417,446
68,283,451
4,093,211
267,455,451
0.408
109,249,964
2,976,891
6,185,933
5.99%
4.36%
9.06%
6,152,500
4,201,544
9,341,752
68,283,451
1,958,152
267,455,451
0.408
109,249,964
1,261,952
2,742,320
2.87%
1.85%
4.02%
2,908,274
1,560,339
4,409,923
68,283,451
533,524
267,455,451
0.408
109,249,964
110,598
1,037,558
0.78%
0.16%
1.52%
762,815
206,034
1,505,975
68,283,451
39,559
267,455,451
0.408
109,249,964
814
57,184
0.06%
0.00%
0.08%
97,814
25,584
128,924
68,283,451
10,010
267,455,451
0.408
109,249,964
0
55,870
0.01%
0.00%
0.08%
36,550
0
121,445
68,283,451
150
267,455,451
0.408
109,249,964
0
814
0.00%
0.00%
0.00%
4,073
0
25,584
68,283,451
0
267,455,451
0.408
109,249,964
0
0
0.00%
0.00%
0.00%
0
0
0
45,365,720
22,541,507
118,756,915
0.481
57,115,043
18,839,706
27,198,901
49.69%
41.53%
59.95%
27,646,634
23,070,839
33,307,069
45,365,720
11,625,568
118,756,915
0.481
57,115,043
9,844,290
13,922,071
25.63%
21.70%
30.69%
13,943,721
11,650,317
16,748,551
45,365,720
2,832,396
118,756,915
0.481
57,115,043
2,128,003
4,226,175
6.24%
4.69%
9.32%
3,804,786
2,775,745
5,509,201
45,365,720
1,347,149
118,756,915
0.481
57,115,043
869,268
1,845,884
2.97%
1.92%
4.07%
1,863,931
1,118,115
2,665,866
45,365,720
363,141
118,756,915
0.481
57,115,043
60,790
738,776
0.80%
0.13%
1.63%
527,079
106,687
1,114,625
45,365,720
37,722
118,756,915
0.481
57,115,043
0
55,556
0.08%
0.00%
0.12%
52,746
0
77,757
45,365,720
9,279
118,756,915
0.481
57,115,043
0
54,242
0.02%
0.00%
0.12%
13,554
0
70,277
45,365,720
25
118,756,915
0.481
57,115,043
0
0
0.00%
0.00%
0.00%
145
0
0
45,365,720
0
118,756,915
0.481
57,115,043
0
0
0.00%
0.00%
0.00%
0
0
0
9,435,102
2,866,634
84,263,597
0.342
28,852,867
1,866,591
3,800,719
30.38%
19.78%
40.28%
5,652,079
3,326,466
8,382,908
9,435,102
1,109,361
84,263,597
0.342
28,852,867
673,799
1,780,500
11.76%
7.14%
18.87%
1,658,670
887,954
2,899,049
9,435,102
134,763
84,263,597
0.342
28,852,867
0
503,677
1.43%
0.00%
5.34%
237,111
0
768,046
9,435,102
18,962
84,263,597
0.342
28,852,867
0
80,882
0.20%
0.00%
0.86%
43,244
0
169,826
9,435,102
336
84,263,597
0.342
28,852,867
0
0
0.00%
0.00%
0.00%
1,317
0
0
9,435,102
0
84,263,597
0.342
28,852,867
0
0
0.00%
0.00%
0.00%
0
0
0
9,435,102
0
84,263,597
0.342
28,852,867
0
0
0.00%
0.00%
0.00%
0
0
0
9,435,102
0
84,263,597
0.342
28,852,867
0
0
0.00%
0.00%
0.00%
0
0
0
9,435,102
0
84,263,597
0.342
28,852,867
0
0
0.00%
0.00%
0.00%
0
0
0
13,482,629
5,801,913
64,434,939
0.361
23,282,055
4,899,932
7,016,265
43.03%
36.34%
52.04%
10,809,544
8,709,044
13,382,849
13,482,629
3,041,900
64,434,939
0.361
23,282,055
2,635,177
3,505,340
22.56%
19.54%
26.00%
5,662,289
4,681,031
6,769,846
13,482,629
1,126,053
64,434,939
0.361
23,282,055
848,889
1,456,082
8.35%
6.30%
10.80%
2,110,602
1,425,799
3,064,505
13,482,629
592,041
64,434,939
0.361
23,282,055
392,685
815,554
4.39%
2.91%
6.05%
1,001,099
442,224
1,574,231
13,482,629
170,048
64,434,939
0.361
23,282,055
49,808
298,782
1.26%
0.37%
2.22%
234,418
99,347
391,350
13,482,629
1,837
64,434,939
0.361
23,282,055
814
1,629
0.01%
0.01%
0.01%
45,067
25,584
51,168
13,482,629
732
64,434,939
0.361
23,282,055
0
1,629
0.01%
0.00%
0.01%
22,997
0
51,168
13,482,629
125
64,434,939
0.361
23,282,055
0
814
0.00%
0.00%
0.01%
3,929
0
25,584
13,482,629
0
64,434,939
0.361
23,282,055
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 18 of 114
December 2016

-------
E.2-CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2 EPs
Number of
UCMR 2 EPs with
Predicted Mean
Exceeding
Threshold
National #
Systems
EP Ratio
National Number
of EPs
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All EPs Only
0.6
537
67
31,621
1.716
54,262
48
90
12.55%
8.94%
16.76%
3,172
1,689
5,071
2
537
15
31,621
1.716
54,262
9
21
2.78%
1.68%
3.91%
582
152
1,001
6
537
3
31,621
1.716
54,262
2
6
0.56%
0.37%
1.12%
51
18
277
10
537
2
31,621
1.716
54,262

2
0.34%
0.19%
0.44%
19
9
21
20
537
1
31,621
1.716
54,262

2
0.20%
0.19%
0.37%
10
9
18
60
537
0
31,621
1.716
54,262
0
1
0.06%
0.00%
0.19%
3
0
9
100
537
0
31,621
1.716
54,262
0
0
0.01%
0.00%
0.00%
0
0
0
200
537
0
31,621
1.716
54,262
0
0
0.00%
0.00%
0.00%
0
0
0
600
537
0
31,621
1.716
54,262
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
197
45
1,682
1.048
1,762
36
55
23.01%
18.27%
27.92%
405
322
492
2
197
11
1,682
1.048
1,762
8
13
5.35%
4.06%
6.60%
94
72
116
6
197
3
1,682
1.048
1,762
2
4
1.42%
1.02%
2.03%
25
18
36
10
197
2
1,682
1.048
1,762

2
0.91%
0.51%
1.19%
16
9
21
20
197
1
1,682
1.048
1,762

2
0.55%
0.51%
1.02%
10
9
18
60
197
0
1,682
1.048
1,762
0
1
0.15%
0.00%
0.51%
3
0
9
100
197
0
1,682
1.048
1,762
0
0
0.02%
0.00%
0.00%
0
0
0
200
197
0
1,682
1.048
1,762
0
0
0.00%
0.00%
0.00%
0
0
0
600
197
0
1,682
1.048
1,762
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
314
12
29,375
1.716
50,404
5
22
3.94%
1.59%
7.01%
1,987
803
3,531
2
314
2
29,375
1.716
50,404
0
3
0.53%
0.00%
0.96%
265
0
482
6
314
0
29,375
1.716
50,404
0
1
0.04%
0.00%
0.32%
19
0
161
10
314
0
29,375
1.716
50,404
0
0
0.00%
0.00%
0.00%
2
0
0
20
314
0
29,375
1.716
50,404
0
0
0.00%
0.00%
0.00%
0
0
0
60
314
0
29,375
1.716
50,404
0
0
0.00%
0.00%
0.00%
0
0
0
100
314
0
29,375
1.716
50,404
0
0
0.00%
0.00%
0.00%
0
0
0
200
314
0
29,375
1.716
50,404
0
0
0.00%
0.00%
0.00%
0
0
0
600
314
0
29,375
1.716
50,404
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
26
10
564
3.714
2,096
7
13
37.19%
26.92%
50.00%
780
564
1,048
2
26
3
564
3.714
2,096

5
10.61%
3.85%
19.23%
222
81
403
6
26
0
564
3.714
2,096
0
1
0.37%
0.00%
3.85%
8
0
81
10
26
0
564
3.714
2,096
0
0
0.02%
0.00%
0.00%
0
0
0
20
26
0
564
3.714
2,096
0
0
0.00%
0.00%
0.00%
0
0
0
60
26
0
564
3.714
2,096
0
0
0.00%
0.00%
0.00%
0
0
0
100
26
0
564
3.714
2,096
0
0
0.00%
0.00%
0.00%
0
0
0
200
26
0
564
3.714
2,096
0
0
0.00%
0.00%
0.00%
0
0
0
600
26
0
564
3.714
2,096
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 19 of 114
December 2016

-------
E.2-CL Only
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
542,851
78,639
30,431,590
0.600
18,253,101
53,000
108,815
14.49%
9.76%
20.05%
1,782,265
1,092,866
2,655,269
542,851
20,779
30,431,590
0.600
18,253,101
11,558
32,353
3.83%
2.13%
5.96%
483,928
200,394
858,868
542,851
4,879
30,431,590
0.600
18,253,101
2,203
12,615
0.90%
0.41%
2.32%
61,122
21,113
289,704
542,851
1,975
30,431,590
0.600
18,253,101
228
4,629
0.36%
0.04%
0.85%
20,169
2,185
44,359
542,851
422
30,431,590
0.600
18,253,101
228
2,203
0.08%
0.04%
0.41%
4,047
2,185
21,113
542,851
69
30,431,590
0.600
18,253,101
0
228
0.01%
0.00%
0.04%
659
0
2,185
542,851
7
30,431,590
0.600
18,253,101
0
0
0.00%
0.00%
0.00%
65
0
0
542,851
0
30,431,590
0.600
18,253,101
0
0
0.00%
0.00%
0.00%
0
0
0
542,851
0
30,431,590
0.600
18,253,101
0
0
0.00%
0.00%
0.00%
0
0
0
225,236
53,462
4,260,326
0.507
2,158,632
38,654
69,397
23.74%
17.16%
30.81%
512,370
370,458
665,089
225,236
13,792
4,260,326
0.507
2,158,632
9,352
18,895
6.12%
4.15%
8.39%
132,179
89,625
181,087
225,236
4,527
4,260,326
0.507
2,158,632
2,203
8,484
2.01%
0.98%
3.77%
43,390
21,113
81,305
225,236
1,945
4,260,326
0.507
2,158,632
228
4,629
0.86%
0.10%
2.05%
18,640
2,185
44,359
225,236
422
4,260,326
0.507
2,158,632
228
2,203
0.19%
0.10%
0.98%
4,047
2,185
21,113
225,236
69
4,260,326
0.507
2,158,632
0
228
0.03%
0.00%
0.10%
659
0
2,185
225,236
7
4,260,326
0.507
2,158,632
0
0
0.00%
0.00%
0.00%
65
0
0
225,236
0
4,260,326
0.507
2,158,632
0
0
0.00%
0.00%
0.00%
0
0
0
225,236
0
4,260,326
0.507
2,158,632
0
0
0.00%
0.00%
0.00%
0
0
0
290,590
11,680
24,741,799
0.596
14,737,904
4,446
22,104
4.02%
1.53%
7.61%
592,385
225,485
1,121,073
290,590
1,938
24,741,799
0.596
14,737,904
0
4,303
0.67%
0.00%
1.48%
98,302
0
218,215
290,590
177
24,741,799
0.596
14,737,904
0
1,925
0.06%
0.00%
0.66%
8,961
0
97,631
290,590
23
24,741,799
0.596
14,737,904
0
0
0.01%
0.00%
0.00%
1,166
0
0
290,590
0
24,741,799
0.596
14,737,904
0
0
0.00%
0.00%
0.00%
0
0
0
290,590
0
24,741,799
0.596
14,737,904
0
0
0.00%
0.00%
0.00%
0
0
0
290,590
0
24,741,799
0.596
14,737,904
0
0
0.00%
0.00%
0.00%
0
0
0
290,590
0
24,741,799
0.596
14,737,904
0
0
0.00%
0.00%
0.00%
0
0
0
290,590
0
24,741,799
0.596
14,737,904
0
0
0.00%
0.00%
0.00%
0
0
0
27,025
13,497
1,429,466
0.949
1,356,566
9,899
17,314
49.94%
36.63%
64.07%
677,510
496,922
869,107
27,025
5,049
1,429,466
0.949
1,356,566
2,207
9,155
18.68%
8.17%
33.88%
253,448
110,768
459,565
27,025
175
1,429,466
0.949
1,356,566
0
2,207
0.65%
0.00%
8.17%
8,772
0
110,768
27,025
7
1,429,466
0.949
1,356,566
0
0
0.03%
0.00%
0.00%
363
0
0
27,025
0
1,429,466
0.949
1,356,566
0
0
0.00%
0.00%
0.00%
0
0
0
27,025
0
1,429,466
0.949
1,356,566
0
0
0.00%
0.00%
0.00%
0
0
0
27,025
0
1,429,466
0.949
1,356,566
0
0
0.00%
0.00%
0.00%
0
0
0
27,025
0
1,429,466
0.949
1,356,566
0
0
0.00%
0.00%
0.00%
0
0
0
27,025
0
1,429,466
0.949
1,356,566
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 20 of 114
December 2016

-------
E.2-CL Only
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
Predicted Mean
National #
MR Ratio
National Number
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)

0.6
428
97
31,621
1.209
38,234
75
122
22.68%
17.52%
28.50%
4,777
2,992
6,802

2
428
21
31,621
1.209
38,234
13
29
4.83%
3.04%
6.78%
723
260
1,296

6
428
3
31,621
1.209
38,234
2
6
0.81%
0.47%
1.40%
41
18
125

10
428
2
31,621
1.209
38,234

3
0.37%
0.23%
0.70%
15
9
27
All MRs Only
20
428
1
31,621
1.209
38,234

1
0.24%
0.23%
0.23%
9
9
9

60
428
0
31,621
1.209
38,234
0
1
0.05%
0.00%
0.23%
2
0
9

100
428
0
31,621
1.209
38,234
0
0
0.00%
0.00%
0.00%
0
0
0

200
428
0
31,621
1.209
38,234
0
0
0.00%
0.00%
0.00%
0
0
0

600
428
0
31,621
1.209
38,234
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
191
66
1,682
1.016
1,709
56
78
34.76%
29.32%
40.84%
594
501
698

2
191
15
1,682
1.016
1,709
11
19
7.88%
5.76%
9.95%
135
98
170

6
191
3
1,682
1.016
1,709
2
5
1.75%
1.05%
2.62%
30
18
45
MRs Only at
10
191
2
1,682
1.016
1,709

3
0.82%
0.52%
1.57%
14
9
27
Surface Water
20
191
1
1,682
1.016
1,709

1
0.53%
0.52%
0.52%
9
9
9
Systems
60
191
0
1,682
1.016
1,709
0
1
0.10%
0.00%
0.52%
2
0
9

100
191
0
1,682
1.016
1,709
0
0
0.00%
0.00%
0.00%
0
0
0

200
191
0
1,682
1.016
1,709
0
0
0.00%
0.00%
0.00%
0
0
0

600
191
0
1,682
1.016
1,709
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
218
21
29,375
1.191
34,994
12
32
9.81%
5.50%
14.68%
3,434
1,926
5,137

2
218
2
29,375
1.191
34,994
0
4
0.77%
0.00%
1.83%
271
0
642

6
218
0
29,375
1.191
34,994
0
0
0.00%
0.00%
0.00%
1
0
0
MRs Only at
10
218
0
29,375
1.191
34,994
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
218
0
29,375
1.191
34,994
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
218
0
29,375
1.191
34,994
0
0
0.00%
0.00%
0.00%
0
0
0

100
218
0
29,375
1.191
34,994
0
0
0.00%
0.00%
0.00%
0
0
0

200
218
0
29,375
1.191
34,994
0
0
0.00%
0.00%
0.00%
0
0
0

600
218
0
29,375
1.191
34,994
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
19
9
564
2.714
1,532
7
12
48.88%
36.84%
63.16%
749
564
967

2
19
4
564
2.714
1,532
2
6
20.71%
10.53%
31.58%
317
161
484

6
19
0
564
2.714
1,532
0
1
0.61%
0.00%
5.26%
9
0
81
MRs Only at
10
19
0
564
2.714
1,532
0
0
0.06%
0.00%
0.00%
1
0
0
Mixed Water
20
19
0
564
2.714
1,532
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
19
0
564
2.714
1,532
0
0
0.00%
0.00%
0.00%
0
0
0

100
19
0
564
2.714
1,532
0
0
0.00%
0.00%
0.00%
0
0
0

200
19
0
564
2.714
1,532
0
0
0.00%
0.00%
0.00%
0
0
0

600
19
0
564
2.714
1,532
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 21 of 114
December 2016

-------
E.2-CL Only
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population Served
by MRs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
435,573
105,016
30,431,590
0.426
12,977,665
76,475
139,348
24.11%
17.56%
31.99%
2,131,279
1,376,913
3,129,496
435,573
23,373
30,431,590
0.426
12,977,665
14,176
35,388
5.37%
3.25%
8.12%
444,965
203,277
779,390
435,573
4,177
30,431,590
0.426
12,977,665
1,252
9,314
0.96%
0.29%
2.14%
44,447
11,997
122,968
435,573
1,238
30,431,590
0.426
12,977,665
228
3,165
0.28%
0.05%
0.73%
12,240
2,185
30,333
435,573
275
30,431,590
0.426
12,977,665
228
228
0.06%
0.05%
0.05%
2,634
2,185
2,185
435,573
45
30,431,590
0.426
12,977,665
0
228
0.01%
0.00%
0.05%
434
0
2,185
435,573
1
30,431,590
0.426
12,977,665
0
0
0.00%
0.00%
0.00%
8
0
0
435,573
0
30,431,590
0.426
12,977,665
0
0
0.00%
0.00%
0.00%
0
0
0
435,573
0
30,431,590
0.426
12,977,665
0
0
0.00%
0.00%
0.00%
0
0
0
221,343
77,555
4,260,326
0.498
2,121,317
60,728
95,574
35.04%
27.44%
43.18%
743,272
582,004
915,968
221,343
17,946
4,260,326
0.498
2,121,317
12,516
24,599
8.11%
5.65%
11.11%
171,996
119,950
235,756
221,343
4,068
4,260,326
0.498
2,121,317
1,252
8,484
1.84%
0.57%
3.83%
38,984
11,997
81,305
221,343
1,228
4,260,326
0.498
2,121,317
228
3,165
0.55%
0.10%
1.43%
11,772
2,185
30,333
221,343
275
4,260,326
0.498
2,121,317
228
228
0.12%
0.10%
0.10%
2,634
2,185
2,185
221,343
45
4,260,326
0.498
2,121,317
0
228
0.02%
0.00%
0.10%
434
0
2,185
221,343
1
4,260,326
0.498
2,121,317
0
0
0.00%
0.00%
0.00%
8
0
0
221,343
0
4,260,326
0.498
2,121,317
0
0
0.00%
0.00%
0.00%
0
0
0
221,343
0
4,260,326
0.498
2,121,317
0
0
0.00%
0.00%
0.00%
0
0
0
197,248
18,326
24,741,799
0.404
10,003,896
8,553
31,169
9.29%
4.34%
15.80%
929,446
433,807
1,580,797
197,248
1,076
24,741,799
0.404
10,003,896
0
3,970
0.55%
0.00%
2.01%
54,586
0
201,356
197,248
2
24,741,799
0.404
10,003,896
0
0
0.00%
0.00%
0.00%
106
0
0
197,248
0
24,741,799
0.404
10,003,896
0
0
0.00%
0.00%
0.00%
0
0
0
197,248
0
24,741,799
0.404
10,003,896
0
0
0.00%
0.00%
0.00%
0
0
0
197,248
0
24,741,799
0.404
10,003,896
0
0
0.00%
0.00%
0.00%
0
0
0
197,248
0
24,741,799
0.404
10,003,896
0
0
0.00%
0.00%
0.00%
0
0
0
197,248
0
24,741,799
0.404
10,003,896
0
0
0.00%
0.00%
0.00%
0
0
0
197,248
0
24,741,799
0.404
10,003,896
0
0
0.00%
0.00%
0.00%
0
0
0
16,982
9,135
1,429,466
0.596
852,452
7,194
12,605
53.79%
42.36%
74.22%
458,561
361,102
632,731
16,982
4,351
1,429,466
0.596
852,452
1,660
6,819
25.62%
9.78%
40.15%
218,383
83,327
342,278
16,982
107
1,429,466
0.596
852,452
0
830
0.63%
0.00%
4.89%
5,357
0
41,664
16,982
9
1,429,466
0.596
852,452
0
0
0.05%
0.00%
0.00%
468
0
0
16,982
0
1,429,466
0.596
852,452
0
0
0.00%
0.00%
0.00%
0
0
0
16,982
0
1,429,466
0.596
852,452
0
0
0.00%
0.00%
0.00%
0
0
0
16,982
0
1,429,466
0.596
852,452
0
0
0.00%
0.00%
0.00%
0
0
0
16,982
0
1,429,466
0.596
852,452
0
0
0.00%
0.00%
0.00%
0
0
0
16,982
0
1,429,466
0.596
852,452
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 22 of 114
December 2016

-------
E.2-CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2 EPs
Number of
UCMR 2 EPs with
Predicted Mean
Exceeding
Threshold
National #
Systems
EP Ratio
National Number
of EPs
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
All EPs Only
0.6
950
98
2,081
4.601
9,574
74
128
10.35%
7.79%
13.47%
1,269
992
1,613
2
950
32
2,081
4.601
9,574
21
42
3.33%
2.21%
4.42%
494
351
630
6
950
6
2,081
4.601
9,574
3
10
0.62%
0.32%
1.05%
91
37
158
10
950
3
2,081
4.601
9,574

4
0.28%
0.11%
0.42%
32
8
59
20
950
1
2,081
4.601
9,574
0
2
0.09%
0.00%
0.21%
7
0
16
60
950
0
2,081
4.601
9,574
0
0
0.00%
0.00%
0.00%
0
0
0
100
950
0
2,081
4.601
9,574
0
0
0.00%
0.00%
0.00%
0
0
0
200
950
0
2,081
4.601
9,574
0
0
0.00%
0.00%
0.00%
0
0
0
600
950
0
2,081
4.601
9,574
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
104
20
519
1.224
634
14
26
19.04%
13.46%
25.00%
121
85
159
2
104
4
519
1.224
634
2
7
4.29%
1.92%
6.73%
27
12
43
6
104
0
519
1.224
634
0
1
0.14%
0.00%
0.96%
1
0
6
10
104
0
519
1.224
634
0
0
0.01%
0.00%
0.00%
0
0
0
20
104
0
519
1.224
634
0
0
0.00%
0.00%
0.00%
0
0
0
60
104
0
519
1.224
634
0
0
0.00%
0.00%
0.00%
0
0
0
100
104
0
519
1.224
634
0
0
0.00%
0.00%
0.00%
0
0
0
200
104
0
519
1.224
634
0
0
0.00%
0.00%
0.00%
0
0
0
600
104
0
519
1.224
634
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
679
39
1,027
5.223
5,365
28
54
5.80%
4.12%
7.95%
311
221
427
2
679
9
1,027
5.223
5,365
5
12
1.25%
0.74%
1.77%
67
40
95
6
679
2
1,027
5.223
5,365
2
3
0.35%
0.29%
0.44%
19
16
24
10
679
2
1,027
5.223
5,365

2
0.27%
0.15%
0.29%
15
8
16
20
679
1
1,027
5.223
5,365
0
2
0.13%
0.00%
0.29%
7
0
16
60
679
0
1,027
5.223
5,365
0
0
0.00%
0.00%
0.00%
0
0
0
100
679
0
1,027
5.223
5,365
0
0
0.00%
0.00%
0.00%
0
0
0
200
679
0
1,027
5.223
5,365
0
0
0.00%
0.00%
0.00%
0
0
0
600
679
0
1,027
5.223
5,365
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
167
39
535
6.680
3,574
32
48
23.42%
19.16%
28.74%
837
685
1,027
2
167
19
535
6.680
3,574
14
23
11.17%
8.38%
13.77%
399
300
492
6
167
3
535
6.680
3,574

6
2.01%
0.60%
3.59%
72
21
128
10
167
1
535
6.680
3,574
0
2
0.49%
0.00%
1.20%
17
0
43
20
167
0
535
6.680
3,574
0
0
0.01%
0.00%
0.00%
0
0
0
60
167
0
535
6.680
3,574
0
0
0.00%
0.00%
0.00%
0
0
0
100
167
0
535
6.680
3,574
0
0
0.00%
0.00%
0.00%
0
0
0
200
167
0
535
6.680
3,574
0
0
0.00%
0.00%
0.00%
0
0
0
600
167
0
535
6.680
3,574
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 23 of 114
December 2016

-------
E.2-CL Only
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
6,240,406
694,319
61,835,442
0.633
39,146,542
484,986
955,296
11.13%
7.77%
15.31%
4,780,085
3,366,117
6,558,745
6,240,406
177,131
61,835,442
0.633
39,146,542
106,477
267,020
2.84%
1.71%
4.28%
1,443,350
982,228
2,014,707
6,240,406
31,332
61,835,442
0.633
39,146,542
15,889
72,230
0.50%
0.25%
1.16%
328,006
142,808
639,755
6,240,406
13,738
61,835,442
0.633
39,146,542
4,700
22,378
0.22%
0.08%
0.36%
115,815
23,325
238,966
6,240,406
4,212
61,835,442
0.633
39,146,542
0
9,400
0.07%
0.00%
0.15%
21,646
0
46,650
6,240,406
97
61,835,442
0.633
39,146,542
0
0
0.00%
0.00%
0.00%
480
0
0
6,240,406
9
61,835,442
0.633
39,146,542
0
0
0.00%
0.00%
0.00%
44
0
0
6,240,406
0
61,835,442
0.633
39,146,542
0
0
0.00%
0.00%
0.00%
0
0
0
6,240,406
0
61,835,442
0.633
39,146,542
0
0
0.00%
0.00%
0.00%
0
0
0
1,755,067
369,396
17,345,917
0.516
8,956,690
267,175
490,752
21.05%
15.22%
27.96%
1,885,150
1,363,481
2,504,469
1,755,067
82,980
17,345,917
0.516
8,956,690
40,055
139,820
4.73%
2.28%
7.97%
423,475
204,413
713,550
1,755,067
2,817
17,345,917
0.516
8,956,690
0
30,017
0.16%
0.00%
1.71%
14,375
0
153,186
1,755,067
169
17,345,917
0.516
8,956,690
0
0
0.01%
0.00%
0.00%
861
0
0
1,755,067
0
17,345,917
0.516
8,956,690
0
0
0.00%
0.00%
0.00%
0
0
0
1,755,067
0
17,345,917
0.516
8,956,690
0
0
0.00%
0.00%
0.00%
0
0
0
1,755,067
0
17,345,917
0.516
8,956,690
0
0
0.00%
0.00%
0.00%
0
0
0
1,755,067
0
17,345,917
0.516
8,956,690
0
0
0.00%
0.00%
0.00%
0
0
0
1,755,067
0
17,345,917
0.516
8,956,690
0
0
0.00%
0.00%
0.00%
0
0
0
3,680,719
194,805
26,592,179
0.687
18,266,499
124,294
287,100
5.29%
3.38%
7.80%
966,768
616,842
1,424,808
3,680,719
38,080
26,592,179
0.687
18,266,499
20,949
59,230
1.03%
0.57%
1.61%
188,982
103,963
293,941
3,680,719
11,052
26,592,179
0.687
18,266,499
9,400
14,100
0.30%
0.26%
0.38%
54,847
46,650
69,975
3,680,719
8,739
26,592,179
0.687
18,266,499
4,700
9,400
0.24%
0.13%
0.26%
43,370
23,325
46,650
3,680,719
4,137
26,592,179
0.687
18,266,499
0
9,400
0.11%
0.00%
0.26%
20,529
0
46,650
3,680,719
97
26,592,179
0.687
18,266,499
0
0
0.00%
0.00%
0.00%
480
0
0
3,680,719
9
26,592,179
0.687
18,266,499
0
0
0.00%
0.00%
0.00%
44
0
0
3,680,719
0
26,592,179
0.687
18,266,499
0
0
0.00%
0.00%
0.00%
0
0
0
3,680,719
0
26,592,179
0.687
18,266,499
0
0
0.00%
0.00%
0.00%
0
0
0
804,620
130,118
17,897,346
0.666
11,923,353
93,517
177,444
16.17%
11.62%
22.05%
1,928,167
1,385,794
2,629,468
804,620
56,071
17,897,346
0.666
11,923,353
45,473
67,970
6.97%
5.65%
8.45%
830,893
673,852
1,007,216
804,620
17,463
17,897,346
0.666
11,923,353
6,489
28,113
2.17%
0.81%
3.49%
258,785
96,158
416,594
804,620
4,831
17,897,346
0.666
11,923,353
0
12,978
0.60%
0.00%
1.61%
71,585
0
192,316
804,620
75
17,897,346
0.666
11,923,353
0
0
0.01%
0.00%
0.00%
1,116
0
0
804,620
0
17,897,346
0.666
11,923,353
0
0
0.00%
0.00%
0.00%
0
0
0
804,620
0
17,897,346
0.666
11,923,353
0
0
0.00%
0.00%
0.00%
0
0
0
804,620
0
17,897,346
0.666
11,923,353
0
0
0.00%
0.00%
0.00%
0
0
0
804,620
0
17,897,346
0.666
11,923,353
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 24 of 114
December 2016

-------
E.2-CL Only
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
Predicted Mean
National #
MR Ratio
National Number
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)

0.6
438
85
2,081
2.023
4,211
62
110
19.34%
14.16%
25.11%
1,014
764
1,279

2
438
21
2,081
2.023
4,211
15
28
4.76%
3.42%
6.39%
294
218
381

6
438
4
2,081
2.023
4,211
2
8
0.92%
0.46%
1.83%
71
43
127

10
438
1
2,081
2.023
4,211
0
3
0.26%
0.00%
0.68%
23
0
49
All MRs Only
20
438
0
2,081
2.023
4,211
0
0
0.01%
0.00%
0.00%
1
0
0

60
438
0
2,081
2.023
4,211
0
0
0.00%
0.00%
0.00%
0
0
0

100
438
0
2,081
2.023
4,211
0
0
0.00%
0.00%
0.00%
0
0
0

200
438
0
2,081
2.023
4,211
0
0
0.00%
0.00%
0.00%
0
0
0

600
438
0
2,081
2.023
4,211
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
101
27
519
1.188
616
20
35
26.47%
19.80%
34.65%
163
122
214

2
101
7
519
1.188
616
5
9
6.56%
4.95%
8.91%
40
31
55

6
101
1
519
1.188
616
0
2
0.96%
0.00%
1.98%
6
0
12
MRs Only at
10
101
0
519
1.188
616
0
1
0.11%
0.00%
0.99%
1
0
6
Surface Water
20
101
0
519
1.188
616
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
101
0
519
1.188
616
0
0
0.00%
0.00%
0.00%
0
0
0

100
101
0
519
1.188
616
0
0
0.00%
0.00%
0.00%
0
0
0

200
101
0
519
1.188
616
0
0
0.00%
0.00%
0.00%
0
0
0

600
101
0
519
1.188
616
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
268
29
1,027
2.062
2,118
19
40
10.77%
7.09%
14.93%
228
150
316

2
268
4
1,027
2.062
2,118
2
6
1.43%
0.75%
2.24%
30
16
47

6
268
0
1,027
2.062
2,118
0
1
0.03%
0.00%
0.37%
1
0
8
MRs Only at
10
268
0
1,027
2.062
2,118
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
268
0
1,027
2.062
2,118
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
268
0
1,027
2.062
2,118
0
0
0.00%
0.00%
0.00%
0
0
0

100
268
0
1,027
2.062
2,118
0
0
0.00%
0.00%
0.00%
0
0
0

200
268
0
1,027
2.062
2,118
0
0
0.00%
0.00%
0.00%
0
0
0

600
268
0
1,027
2.062
2,118
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
69
29
535
2.760
1,477
23
35
42.18%
33.33%
50.72%
623
492
749

2
69
10
535
2.760
1,477
8
13
15.09%
11.59%
18.84%
223
171
278

6
69
3
535
2.760
1,477
2
5
4.33%
2.90%
7.25%
64
43
107
MRs Only at
10
69
1
535
2.760
1,477
0
2
1.52%
0.00%
2.90%
22
0
43
Mixed Water
20
69
0
535
2.760
1,477
0
0
0.04%
0.00%
0.00%
1
0
0
Systems
60
69
0
535
2.760
1,477
0
0
0.00%
0.00%
0.00%
0
0
0

100
69
0
535
2.760
1,477
0
0
0.00%
0.00%
0.00%
0
0
0

200
69
0
535
2.760
1,477
0
0
0.00%
0.00%
0.00%
0
0
0

600
69
0
535
2.760
1,477
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 25 of 114
December 2016

-------
E.2-CL Only
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population Served
by MRs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
3,848,394
797,275
61,835,442
0.382
23,624,096
545,956
1,088,574
20.72%
14.19%
28.29%
5,583,046
3,875,994
7,586,487
3,848,394
195,109
61,835,442
0.382
23,624,096
115,466
278,699
5.07%
3.00%
7.24%
1,555,003
1,038,039
2,106,326
3,848,394
41,362
61,835,442
0.382
23,624,096
12,978
68,326
1.07%
0.34%
1.78%
398,344
192,316
613,249
3,848,394
9,618
61,835,442
0.382
23,624,096
0
42,995
0.25%
0.00%
1.12%
115,101
0
345,502
3,848,394
158
61,835,442
0.382
23,624,096
0
0
0.00%
0.00%
0.00%
2,341
0
0
3,848,394
0
61,835,442
0.382
23,624,096
0
0
0.00%
0.00%
0.00%
0
0
0
3,848,394
0
61,835,442
0.382
23,624,096
0
0
0.00%
0.00%
0.00%
0
0
0
3,848,394
0
61,835,442
0.382
23,624,096
0
0
0.00%
0.00%
0.00%
0
0
0
3,848,394
0
61,835,442
0.382
23,624,096
0
0
0.00%
0.00%
0.00%
0
0
0
1,707,695
462,683
17,345,917
0.502
8,714,935
338,270
608,678
27.09%
19.81%
35.64%
2,361,226
1,726,302
3,106,286
1,707,695
119,201
17,345,917
0.502
8,714,935
66,517
159,646
6.98%
3.90%
9.35%
608,322
339,458
814,724
1,707,695
21,886
17,345,917
0.502
8,714,935
0
40,055
1.28%
0.00%
2.35%
111,691
0
204,413
1,707,695
2,821
17,345,917
0.502
8,714,935
0
30,017
0.17%
0.00%
1.76%
14,396
0
153,186
1,707,695
0
17,345,917
0.502
8,714,935
0
0
0.00%
0.00%
0.00%
0
0
0
1,707,695
0
17,345,917
0.502
8,714,935
0
0
0.00%
0.00%
0.00%
0
0
0
1,707,695
0
17,345,917
0.502
8,714,935
0
0
0.00%
0.00%
0.00%
0
0
0
1,707,695
0
17,345,917
0.502
8,714,935
0
0
0.00%
0.00%
0.00%
0
0
0
1,707,695
0
17,345,917
0.502
8,714,935
0
0
0.00%
0.00%
0.00%
0
0
0
1,705,892
176,175
26,592,179
0.318
8,465,918
94,151
266,968
10.33%
5.52%
15.65%
874,315
467,247
1,324,895
1,705,892
18,078
26,592,179
0.318
8,465,918
2,717
47,952
1.06%
0.16%
2.81%
89,718
13,482
237,973
1,705,892
198
26,592,179
0.318
8,465,918
0
1,025
0.01%
0.00%
0.06%
984
0
5,088
1,705,892
2
26,592,179
0.318
8,465,918
0
0
0.00%
0.00%
0.00%
10
0
0
1,705,892
0
26,592,179
0.318
8,465,918
0
0
0.00%
0.00%
0.00%
0
0
0
1,705,892
0
26,592,179
0.318
8,465,918
0
0
0.00%
0.00%
0.00%
0
0
0
1,705,892
0
26,592,179
0.318
8,465,918
0
0
0.00%
0.00%
0.00%
0
0
0
1,705,892
0
26,592,179
0.318
8,465,918
0
0
0.00%
0.00%
0.00%
0
0
0
1,705,892
0
26,592,179
0.318
8,465,918
0
0
0.00%
0.00%
0.00%
0
0
0
434,807
158,416
17,897,346
0.360
6,443,242
113,536
212,929
36.43%
26.11%
48.97%
2,347,505
1,682,445
3,155,306
434,807
57,830
17,897,346
0.360
6,443,242
46,232
71,102
13.30%
10.63%
16.35%
856,963
685,099
1,053,628
434,807
19,278
17,897,346
0.360
6,443,242
12,978
27,246
4.43%
2.98%
6.27%
285,669
192,316
403,748
434,807
6,795
17,897,346
0.360
6,443,242
0
12,978
1.56%
0.00%
2.98%
100,696
0
192,316
434,807
158
17,897,346
0.360
6,443,242
0
0
0.04%
0.00%
0.00%
2,341
0
0
434,807
0
17,897,346
0.360
6,443,242
0
0
0.00%
0.00%
0.00%
0
0
0
434,807
0
17,897,346
0.360
6,443,242
0
0
0.00%
0.00%
0.00%
0
0
0
434,807
0
17,897,346
0.360
6,443,242
0
0
0.00%
0.00%
0.00%
0
0
0
434,807
0
17,897,346
0.360
6,443,242
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 26 of 114
December 2016

-------
E.2-CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2 EPs
Number of
UCMR 2 EPs with
Predicted Mean
Exceeding
Threshold
National #
Systems
EP Ratio
National Number
of EPs
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All EPs Only
0.6
2,243
203
207
10.836
2,243
156
258
9.07%
6.95%
11.50%
203
156
258
2
2,243
35
207
10.836
2,243
25
46
1.57%
1.11%
2.05%
35
25
46
6
2,243
8
207
10.836
2,243
4
12
0.35%
0.18%
0.53%
8
4
12
10
2,243
3
207
10.836
2,243

6
0.12%
0.04%
0.27%
3

6
20
2,243
1
207
10.836
2,243
0
2
0.02%
0.00%
0.09%
1
0
2
60
2,243
0
207
10.836
2,243
0
0
0.00%
0.00%
0.00%
0
0
0
100
2,243
0
207
10.836
2,243
0
0
0.00%
0.00%
0.00%
0
0
0
200
2,243
0
207
10.836
2,243
0
0
0.00%
0.00%
0.00%
0
0
0
600
2,243
0
207
10.836
2,243
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
225
27
110
2.045
225
20
35
12.09%
8.89%
15.56%
27
20
35
2
225
7
110
2.045
225
5
10
3.29%
2.22%
4.44%
7
5
10
6
225
2
110
2.045
225

3
0.89%
0.44%
1.33%
2

3
10
225
1
110
2.045
225

2
0.49%
0.44%
0.89%
1

2
20
225
0
110
2.045
225
0
1
0.20%
0.00%
0.44%
0
0
1
60
225
0
110
2.045
225
0
0
0.00%
0.00%
0.00%
0
0
0
100
225
0
110
2.045
225
0
0
0.00%
0.00%
0.00%
0
0
0
200
225
0
110
2.045
225
0
0
0.00%
0.00%
0.00%
0
0
0
600
225
0
110
2.045
225
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
942
73
45
20.933
942
53
97
7.74%
5.63%
10.30%
73
53
97
2
942
5
45
20.933
942
2
8
0.54%
0.21%
0.85%
5
2
8
6
942
0
45
20.933
942
0
1
0.03%
0.00%
0.11%
0
0
1
10
942
0
45
20.933
942
0
1
0.01%
0.00%
0.11%
0
0
1
20
942
0
45
20.933
942
0
0
0.00%
0.00%
0.00%
0
0
0
60
942
0
45
20.933
942
0
0
0.00%
0.00%
0.00%
0
0
0
100
942
0
45
20.933
942
0
0
0.00%
0.00%
0.00%
0
0
0
200
942
0
45
20.933
942
0
0
0.00%
0.00%
0.00%
0
0
0
600
942
0
45
20.933
942
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
1,076
103
52
20.692
1,076
83
126
9.60%
7.71%
11.71%
103
83
126
2
1,076
23
52
20.692
1,076
18
28
2.10%
1.67%
2.60%
23
18
28
6
1,076
5
52
20.692
1,076
3
8
0.50%
0.28%
0.74%
5
3
8
10
1,076
2
52
20.692
1,076
0
3
0.15%
0.00%
0.28%
2
0
3
20
1,076
0
52
20.692
1,076
0
1
0.01%
0.00%
0.09%
0
0
1
60
1,076
0
52
20.692
1,076
0
0
0.00%
0.00%
0.00%
0
0
0
100
1,076
0
52
20.692
1,076
0
0
0.00%
0.00%
0.00%
0
0
0
200
1,076
0
52
20.692
1,076
0
0
0.00%
0.00%
0.00%
0
0
0
600
1,076
0
52
20.692
1,076
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 27 of 114
December 2016

-------
E.2-CL Only
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
46,685,528
5,236,751
70,477,886
0.662
46,685,528
3,669,137
7,470,954
11.22%
7.86%
16.00%
5,236,751
3,669,137
7,470,954
46,685,528
1,218,291
70,477,886
0.662
46,685,528
650,453
1,857,570
2.61%
1.39%
3.98%
1,218,291
650,453
1,857,570
46,685,528
158,448
70,477,886
0.662
46,685,528
55,265
328,797
0.34%
0.12%
0.70%
158,448
55,265
328,797
46,685,528
53,313
70,477,886
0.662
46,685,528
30,722
153,549
0.11%
0.07%
0.33%
53,313
30,722
153,549
46,685,528
15,153
70,477,886
0.662
46,685,528
0
41,915
0.03%
0.00%
0.09%
15,153
0
41,915
46,685,528
0
70,477,886
0.662
46,685,528
0
0
0.00%
0.00%
0.00%
0
0
0
46,685,528
0
70,477,886
0.662
46,685,528
0
0
0.00%
0.00%
0.00%
0
0
0
46,685,528
0
70,477,886
0.662
46,685,528
0
0
0.00%
0.00%
0.00%
0
0
0
46,685,528
0
70,477,886
0.662
46,685,528
0
0
0.00%
0.00%
0.00%
0
0
0
23,764,773
3,316,508
41,269,868
0.576
23,764,773
2,288,703
4,840,846
13.96%
9.63%
20.37%
3,316,508
2,288,703
4,840,846
23,764,773
880,512
41,269,868
0.576
23,764,773
432,452
1,388,716
3.71%
1.82%
5.84%
880,512
432,452
1,388,716
23,764,773
104,288
41,269,868
0.576
23,764,773
30,722
234,546
0.44%
0.13%
0.99%
104,288
30,722
234,546
23,764,773
39,120
41,269,868
0.576
23,764,773
30,722
116,978
0.16%
0.13%
0.49%
39,120
30,722
116,978
23,764,773
14,120
41,269,868
0.576
23,764,773
0
30,722
0.06%
0.00%
0.13%
14,120
0
30,722
23,764,773
0
41,269,868
0.576
23,764,773
0
0
0.00%
0.00%
0.00%
0
0
0
23,764,773
0
41,269,868
0.576
23,764,773
0
0
0.00%
0.00%
0.00%
0
0
0
23,764,773
0
41,269,868
0.576
23,764,773
0
0
0.00%
0.00%
0.00%
0
0
0
23,764,773
0
41,269,868
0.576
23,764,773
0
0
0.00%
0.00%
0.00%
0
0
0
7,983,907
387,123
11,230,816
0.711
7,983,907
232,878
561,820
4.85%
2.92%
7.04%
387,123
232,878
561,820
7,983,907
30,441
11,230,816
0.711
7,983,907
6,589
62,488
0.38%
0.08%
0.78%
30,441
6,589
62,488
7,983,907
976
11,230,816
0.711
7,983,907
0
2,196
0.01%
0.00%
0.03%
976
0
2,196
7,983,907
115
11,230,816
0.711
7,983,907
0
2,196
0.00%
0.00%
0.03%
115
0
2,196
7,983,907
0
11,230,816
0.711
7,983,907
0
0
0.00%
0.00%
0.00%
0
0
0
7,983,907
0
11,230,816
0.711
7,983,907
0
0
0.00%
0.00%
0.00%
0
0
0
7,983,907
0
11,230,816
0.711
7,983,907
0
0
0.00%
0.00%
0.00%
0
0
0
7,983,907
0
11,230,816
0.711
7,983,907
0
0
0.00%
0.00%
0.00%
0
0
0
7,983,907
0
11,230,816
0.711
7,983,907
0
0
0.00%
0.00%
0.00%
0
0
0
14,936,848
1,533,121
17,977,203
0.831
14,936,848
1,147,556
2,068,289
10.26%
7.68%
13.85%
1,533,121
1,147,556
2,068,289
14,936,848
307,338
17,977,203
0.831
14,936,848
211,412
406,367
2.06%
1.42%
2.72%
307,338
211,412
406,367
14,936,848
53,184
17,977,203
0.831
14,936,848
24,543
92,054
0.36%
0.16%
0.62%
53,184
24,543
92,054
14,936,848
14,077
17,977,203
0.831
14,936,848
0
34,374
0.09%
0.00%
0.23%
14,077
0
34,374
14,936,848
1,033
17,977,203
0.831
14,936,848
0
11,193
0.01%
0.00%
0.07%
1,033
0
11,193
14,936,848
0
17,977,203
0.831
14,936,848
0
0
0.00%
0.00%
0.00%
0
0
0
14,936,848
0
17,977,203
0.831
14,936,848
0
0
0.00%
0.00%
0.00%
0
0
0
14,936,848
0
17,977,203
0.831
14,936,848
0
0
0.00%
0.00%
0.00%
0
0
0
14,936,848
0
17,977,203
0.831
14,936,848
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 28 of 114
December 2016

-------
E.2-CL Only
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
Predicted Mean
National #
MR Ratio
National Number
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
987
180
207
4.768
987
137
231
18.19%
13.88%
23.40%
180
137
231

2
987
51
207
4.768
987
44
59
5.16%
4.46%
5.98%
51
44
59

6
987
24
207
4.768
987
20
28
2.41%
2.03%
2.84%
24
20
28

10
987
13
207
4.768
987
9
17
1.34%
0.91%
1.72%
13
9
17
All MRs Only
20
987
3
207
4.768
987

5
0.28%
0.10%
0.51%
3

5

60
987
0
207
4.768
987
0
0
0.00%
0.00%
0.00%
0
0
0

100
987
0
207
4.768
987
0
0
0.00%
0.00%
0.00%
0
0
0

200
987
0
207
4.768
987
0
0
0.00%
0.00%
0.00%
0
0
0

600
987
0
207
4.768
987
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
210
39
110
1.909
210
29
51
18.48%
13.81%
24.29%
39
29
51

2
210
8
110
1.909
210
6
11
3.96%
2.86%
5.24%
8
6
11

6
210
2
110
1.909
210
2
3
1.07%
0.95%
1.43%
2
2
3
MRs Only at
10
210
2
110
1.909
210

2
0.73%
0.48%
0.95%
2

2
Surface Water
20
210
1
110
1.909
210
0
1
0.25%
0.00%
0.48%
1
0
1
Systems
60
210
0
110
1.909
210
0
0
0.00%
0.00%
0.00%
0
0
0

100
210
0
110
1.909
210
0
0
0.00%
0.00%
0.00%
0
0
0

200
210
0
110
1.909
210
0
0
0.00%
0.00%
0.00%
0
0
0

600
210
0
110
1.909
210
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
448
54
45
9.956
448
33
79
12.07%
7.37%
17.63%
54
33
79

2
448
1
45
9.956
448
0
3
0.27%
0.00%
0.67%
1
0
3

6
448
0
45
9.956
448
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
448
0
45
9.956
448
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
448
0
45
9.956
448
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
448
0
45
9.956
448
0
0
0.00%
0.00%
0.00%
0
0
0

100
448
0
45
9.956
448
0
0
0.00%
0.00%
0.00%
0
0
0

200
448
0
45
9.956
448
0
0
0.00%
0.00%
0.00%
0
0
0

600
448
0
45
9.956
448
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
329
87
52
6.327
329
75
101
26.34%
22.80%
30.70%
87
75
101

2
329
41
52
6.327
329
38
45
12.58%
11.55%
13.68%
41
38
45

6
329
22
52
6.327
329
18
25
6.56%
5.47%
7.60%
22
18
25
MRs Only at
10
329
12
52
6.327
329
8
15
3.54%
2.43%
4.56%
12
8
15
Mixed Water
20
329
2
52
6.327
329

4
0.67%
0.30%
1.22%
2

4
Systems
60
329
0
52
6.327
329
0
0
0.00%
0.00%
0.00%
0
0
0

100
329
0
52
6.327
329
0
0
0.00%
0.00%
0.00%
0
0
0

200
329
0
52
6.327
329
0
0
0.00%
0.00%
0.00%
0
0
0

600
329
0
52
6.327
329
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 29 of 114
December 2016

-------
E.2-CL Only
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population Served
by MRs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
35,475,847
7,458,151
70,477,886
0.503
35,475,847
5,373,613
10,306,380
21.02%
15.15%
29.05%
7,458,151
5,373,613
10,306,380
35,475,847
2,379,208
70,477,886
0.503
35,475,847
1,786,580
3,011,301
6.71%
5.04%
8.49%
2,379,208
1,786,580
3,011,301
35,475,847
782,251
70,477,886
0.503
35,475,847
639,164
1,239,603
2.21%
1.80%
3.49%
782,251
639,164
1,239,603
35,475,847
444,764
70,477,886
0.503
35,475,847
329,367
568,599
1.25%
0.93%
1.60%
444,764
329,367
568,599
35,475,847
120,730
70,477,886
0.503
35,475,847
11,193
234,202
0.34%
0.03%
0.66%
120,730
11,193
234,202
35,475,847
139
70,477,886
0.503
35,475,847
0
0
0.00%
0.00%
0.00%
139
0
0
35,475,847
0
70,477,886
0.503
35,475,847
0
0
0.00%
0.00%
0.00%
0
0
0
35,475,847
0
70,477,886
0.503
35,475,847
0
0
0.00%
0.00%
0.00%
0
0
0
35,475,847
0
70,477,886
0.503
35,475,847
0
0
0.00%
0.00%
0.00%
0
0
0
22,489,454
4,903,999
41,269,868
0.545
22,489,454
3,409,548
6,817,406
21.81%
15.16%
30.31%
4,903,999
3,409,548
6,817,406
22,489,454
1,195,733
41,269,868
0.545
22,489,454
705,211
1,705,595
5.32%
3.14%
7.58%
1,195,733
705,211
1,705,595
22,489,454
148,092
41,269,868
0.545
22,489,454
116,978
495,499
0.66%
0.52%
2.20%
148,092
116,978
495,499
22,489,454
101,463
41,269,868
0.545
22,489,454
86,256
116,978
0.45%
0.38%
0.52%
101,463
86,256
116,978
22,489,454
43,230
41,269,868
0.545
22,489,454
0
86,256
0.19%
0.00%
0.38%
43,230
0
86,256
22,489,454
0
41,269,868
0.545
22,489,454
0
0
0.00%
0.00%
0.00%
0
0
0
22,489,454
0
41,269,868
0.545
22,489,454
0
0
0.00%
0.00%
0.00%
0
0
0
22,489,454
0
41,269,868
0.545
22,489,454
0
0
0.00%
0.00%
0.00%
0
0
0
22,489,454
0
41,269,868
0.545
22,489,454
0
0
0.00%
0.00%
0.00%
0
0
0
4,130,884
269,546
11,230,816
0.368
4,130,884
125,546
459,407
6.53%
3.04%
11.12%
269,546
125,546
459,407
4,130,884
6,096
11,230,816
0.368
4,130,884
0
29,012
0.15%
0.00%
0.70%
6,096
0
29,012
4,130,884
4
11,230,816
0.368
4,130,884
0
0
0.00%
0.00%
0.00%
4
0
0
4,130,884
0
11,230,816
0.368
4,130,884
0
0
0.00%
0.00%
0.00%
0
0
0
4,130,884
0
11,230,816
0.368
4,130,884
0
0
0.00%
0.00%
0.00%
0
0
0
4,130,884
0
11,230,816
0.368
4,130,884
0
0
0.00%
0.00%
0.00%
0
0
0
4,130,884
0
11,230,816
0.368
4,130,884
0
0
0.00%
0.00%
0.00%
0
0
0
4,130,884
0
11,230,816
0.368
4,130,884
0
0
0.00%
0.00%
0.00%
0
0
0
4,130,884
0
11,230,816
0.368
4,130,884
0
0
0.00%
0.00%
0.00%
0
0
0
8,855,509
2,284,606
17,977,203
0.493
8,855,509
1,838,518
3,029,567
25.80%
20.76%
34.21%
2,284,606
1,838,518
3,029,567
8,855,509
1,177,380
17,977,203
0.493
8,855,509
1,081,369
1,276,693
13.30%
12.21%
14.42%
1,177,380
1,081,369
1,276,693
8,855,509
634,155
17,977,203
0.493
8,855,509
522,186
744,103
7.16%
5.90%
8.40%
634,155
522,186
744,103
8,855,509
343,302
17,977,203
0.493
8,855,509
243,111
451,621
3.88%
2.75%
5.10%
343,302
243,111
451,621
8,855,509
77,500
17,977,203
0.493
8,855,509
11,193
147,945
0.88%
0.13%
1.67%
77,500
11,193
147,945
8,855,509
139
17,977,203
0.493
8,855,509
0
0
0.00%
0.00%
0.00%
139
0
0
8,855,509
0
17,977,203
0.493
8,855,509
0
0
0.00%
0.00%
0.00%
0
0
0
8,855,509
0
17,977,203
0.493
8,855,509
0
0
0.00%
0.00%
0.00%
0
0
0
8,855,509
0
17,977,203
0.493
8,855,509
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 30 of 114
December 2016

-------
E.2-CL Only







90% CI on Number of UCMR 2 EPs
Percentage of
90% CI on Percentage of EPs with
Total Number of
90% CI on Number of EPs with



Number of



with Predicted Mean Exceeding
EPs with
Predicted Mean Exceeding
Mean Exceeding Threshold -
Source Water Type
Threshold
Total
Number of
UCMR2 EPs
UCMR 2 EPs with
Predicted Mean
Exceeding
National #
EP Ratio
National Number
Threshold
Predicted Mean
Exceeding
Threshold -
Threshold - National Extrapolation
Exceeding
National Extrapolation
(ng/L)
Systems
of EPs




Threshold -
National
Extrapolation





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
3,730
369
33,909
1.949
66,079
278
476
9.90%
7.45%
12.76%
4,645
2,836
6,942

2
3,730
82
33,909
1.949
66,079
55
109
2.19%
1.47%
2.92%
1,110
529
1,677

6
3,730
17
33,909
1.949
66,079
9
28
0.45%
0.24%
0.75%
150
59
447

10
3,730
7
33,909
1.949
66,079
3
12
0.19%
0.08%
0.33%
54
18
86
All EPs Only
20
3,730
3
33,909
1.949
66,079

6
0.07%
0.03%
0.16%
18
9
36

60
3,730
0
33,909
1.949
66,079
0
1
0.01%
0.00%
0.03%
3
0
9

100
3,730
0
33,909
1.949
66,079
0
0
0.00%
0.00%
0.00%
0
0
0

200
3,730
0
33,909
1.949
66,079
0
0
0.00%
0.00%
0.00%
0
0
0

600
3,730
0
33,909
1.949
66,079
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
526
92
2,310
1.135
2,622
70
116
17.55%
13.31%
22.05%
553
427
686

2
526
22
2,310
1.135
2,622
15
30
4.26%
2.85%
5.70%
129
89
169

6
526
5
2,310
1.135
2,622
3
8
0.94%
0.57%
1.52%
28
19
45
EPs Only at Surface
Water Systems
10
526
3
2,310
1.135
2,622
2
4
0.55%
0.38%
0.83%
17
10
23
20
526
2
2,310
1.135
2,622

3
0.29%
0.19%
0.57%
10
9
19
60
526
0
2,310
1.135
2,622
0
1
0.06%
0.00%
0.19%
3
0
9

100
526
0
2,310
1.135
2,622
0
0
0.01%
0.00%
0.00%
0
0
0

200
526
0
2,310
1.135
2,622
0
0
0.00%
0.00%
0.00%
0
0
0

600
526
0
2,310
1.135
2,622
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1,935
125
30,448
1.863
56,711
86
173
6.45%
4.44%
8.94%
2,371
1,077
4,055

2
1,935
15
30,448
1.863
56,711
7
23
0.79%
0.36%
1.19%
337
42
584

6
1,935
3
30,448
1.863
56,711
2
5
0.14%
0.10%
0.26%
38
16
185
EPs Only at Ground
Water Systems
10
1,935
2
30,448
1.863
56,711

3
0.10%
0.05%
0.16%
17
8
17
20
1,935
1
30,448
1.863
56,711
0
2
0.05%
0.00%
0.10%
7
0
16
60
1,935
0
30,448
1.863
56,711
0
0
0.00%
0.00%
0.00%
0
0
0

100
1,935
0
30,448
1.863
56,711
0
0
0.00%
0.00%
0.00%
0
0
0

200
1,935
0
30,448
1.863
56,711
0
0
0.00%
0.00%
0.00%
0
0
0

600
1,935
0
30,448
1.863
56,711
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1,269
152
1,151
5.859
6,746
122
187
11.98%
9.61%
14.74%
1,720
1,332
2,201

2
1,269
44
1,151
5.859
6,746
33
56
3.47%
2.60%
4.41%
644
398
923

6
1,269
9
1,151
5.859
6,746
4
15
0.70%
0.32%
1.18%
85
24
217
EPs Only at
10
1,269
2
1,151
5.859
6,746
0
5
0.19%
0.00%
0.39%
19
0
46
Mixed Water
20
1,269
0
1,151
5.859
6,746
0
1
0.01%
0.00%
0.08%
0
0
1
Systems
60
1,269
0
1,151
5.859
6,746
0
0
0.00%
0.00%
0.00%
0
0
0

100
1,269
0
1,151
5.859
6,746
0
0
0.00%
0.00%
0.00%
0
0
0

200
1,269
0
1,151
5.859
6,746
0
0
0.00%
0.00%
0.00%
0
0
0

600
1,269
0
1,151
5.859
6,746
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 31 of 114
December 2016

-------
E.2-CL Only
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
National Pop.
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Predicted Mean
Exceeding
Threshold
Served
Lower Bound
Upper Bound
Mean Exceeding
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
ALL SYSTEMS
53,468,785
6,009,708
162,744,918
0.640
104,085,171
4,207,123
8,535,065
11.24%
7.87%
15.96%
11,799,100
8,128,120
16,684,968
53,468,785
1,416,201
162,744,918
0.640
104,085,171
768,488
2,156,943
2.65%
1.44%
4.03%
3,145,570
1,833,075
4,731,145
53,468,785
194,659
162,744,918
0.640
104,085,171
73,357
413,641
0.36%
0.14%
0.77%
547,577
219,186
1,258,255
53,468,785
69,026
162,744,918
0.640
104,085,171
35,650
180,555
0.13%
0.07%
0.34%
189,297
56,232
436,873
53,468,785
19,787
162,744,918
0.640
104,085,171
228
53,518
0.04%
0.00%
0.10%
40,846
2,185
109,678
53,468,785
166
162,744,918
0.640
104,085,171
0
228
0.00%
0.00%
0.00%
1,139
0
2,185
53,468,785
16
162,744,918
0.640
104,085,171
0
0
0.00%
0.00%
0.00%
109
0
0
53,468,785
0
162,744,918
0.640
104,085,171
0
0
0.00%
0.00%
0.00%
0
0
0
53,468,785
0
162,744,918
0.640
104,085,171
0
0
0.00%
0.00%
0.00%
0
0
0
25,745,076
3,739,365
62,876,111
0.555
34,880,095
2,594,532
5,400,994
14.52%
10.08%
20.98%
5,714,027
4,022,643
8,010,403
25,745,076
977,284
62,876,111
0.555
34,880,095
481,858
1,547,431
3.80%
1.87%
6.01%
1,436,166
726,490
2,283,353
25,745,076
111,633
62,876,111
0.555
34,880,095
32,925
273,046
0.43%
0.13%
1.06%
162,053
51,835
469,036
25,745,076
41,234
62,876,111
0.555
34,880,095
30,950
121,607
0.16%
0.12%
0.47%
58,621
32,907
161,337
25,745,076
14,542
62,876,111
0.555
34,880,095
228
32,925
0.06%
0.00%
0.13%
18,167
2,185
51,835
25,745,076
69
62,876,111
0.555
34,880,095
0
228
0.00%
0.00%
0.00%
659
0
2,185
25,745,076
7
62,876,111
0.555
34,880,095
0
0
0.00%
0.00%
0.00%
65
0
0
25,745,076
0
62,876,111
0.555
34,880,095
0
0
0.00%
0.00%
0.00%
0
0
0
25,745,076
0
62,876,111
0.555
34,880,095
0
0
0.00%
0.00%
0.00%
0
0
0
11,955,216
593,608
62,564,793
0.655
40,988,310
361,618
871,025
4.97%
3.02%
7.29%
1,946,276
1,075,205
3,107,701
11,955,216
70,460
62,564,793
0.655
40,988,310
27,538
126,020
0.59%
0.23%
1.05%
317,725
110,552
574,644
11,955,216
12,204
62,564,793
0.655
40,988,310
9,400
18,221
0.10%
0.08%
0.15%
64,783
46,650
169,802
11,955,216
8,877
62,564,793
0.655
40,988,310
4,700
11,596
0.07%
0.04%
0.10%
44,651
23,325
48,846
11,955,216
4,137
62,564,793
0.655
40,988,310
0
9,400
0.03%
0.00%
0.08%
20,529
0
46,650
11,955,216
97
62,564,793
0.655
40,988,310
0
0
0.00%
0.00%
0.00%
480
0
0
11,955,216
9
62,564,793
0.655
40,988,310
0
0
0.00%
0.00%
0.00%
44
0
0
11,955,216
0
62,564,793
0.655
40,988,310
0
0
0.00%
0.00%
0.00%
0
0
0
11,955,216
0
62,564,793
0.655
40,988,310
0
0
0.00%
0.00%
0.00%
0
0
0
15,768,493
1,676,735
37,304,014
0.756
28,216,767
1,250,972
2,263,046
10.63%
7.93%
14.35%
4,138,797
3,030,272
5,566,863
15,768,493
368,458
37,304,014
0.756
28,216,767
259,092
483,492
2.34%
1.64%
3.07%
1,391,679
996,033
1,873,148
15,768,493
70,823
37,304,014
0.756
28,216,767
31,032
122,374
0.45%
0.20%
0.78%
320,741
120,701
619,417
15,768,493
18,915
37,304,014
0.756
28,216,767
0
47,352
0.12%
0.00%
0.30%
86,025
0
226,690
15,768,493
1,109
37,304,014
0.756
28,216,767
0
11,193
0.01%
0.00%
0.07%
2,149
0
11,193
15,768,493
0
37,304,014
0.756
28,216,767
0
0
0.00%
0.00%
0.00%
0
0
0
15,768,493
0
37,304,014
0.756
28,216,767
0
0
0.00%
0.00%
0.00%
0
0
0
15,768,493
0
37,304,014
0.756
28,216,767
0
0
0.00%
0.00%
0.00%
0
0
0
15,768,493
0
37,304,014
0.756
28,216,767
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 32 of 114
December 2016

-------
E.2-CL Only
Source Water Type
Threshold
(ng/L)
Total Number of
UCMR2 MRs
Number of
UCMR 2 MRs with
Predicted Mean
Exceeding
Threshold
National #
Systems
MR Ratio
National Number
of MRs
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All MRs Only
0.6
1,853
361
33,909
1.281
43,431
274
463
19.50%
14.79%
24.99%
5,971
3,893
8,311
2
1,853
92
33,909
1.281
43,431
72
116
4.99%
3.89%
6.26%
1,067
521
1,735
6
1,853
31
33,909
1.281
43,431
24
42
1.69%
1.30%
2.27%
135
81
280
10
1,853
16
33,909
1.281
43,431
10
23
0.86%
0.54%
1.24%
51
18
93
20
1,853
4
33,909
1.281
43,431
2
6
0.20%
0.11%
0.32%
12
10
14
60
1,853
0
33,909
1.281
43,431
0
1
0.01%
0.00%
0.05%
2
0
9
100
1,853
0
33,909
1.281
43,431
0
0
0.00%
0.00%
0.00%
0
0
0
200
1,853
0
33,909
1.281
43,431
0
0
0.00%
0.00%
0.00%
0
0
0
600
1,853
0
33,909
1.281
43,431
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Surface Water
Systems
0.6
502
132
2,310
1.097
2,535
105
164
26.29%
20.92%
32.67%
796
652
962
2
502
30
2,310
1.097
2,535
22
39
5.98%
4.38%
7.77%
183
135
236
6
502
7
2,310
1.097
2,535
4
10
1.31%
0.80%
1.99%
38
20
60
10
502
3
2,310
1.097
2,535
2
6
0.64%
0.40%
1.20%
16
10
35
20
502
2
2,310
1.097
2,535

2
0.31%
0.20%
0.40%
10
9
10
60
502
0
2,310
1.097
2,535
0
1
0.04%
0.00%
0.20%
2
0
9
100
502
0
2,310
1.097
2,535
0
0
0.00%
0.00%
0.00%
0
0
0
200
502
0
2,310
1.097
2,535
0
0
0.00%
0.00%
0.00%
0
0
0
600
502
0
2,310
1.097
2,535
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Ground Water
Systems
0.6
934
104
30,448
1.234
37,559
64
151
11.17%
6.85%
16.17%
3,717
2,109
5,532
2
934
7
30,448
1.234
37,559
2
13
0.72%
0.21%
1.39%
302
16
692
6
934
0
30,448
1.234
37,559
0
1
0.01%
0.00%
0.11%
2
0
8
10
934
0
30,448
1.234
37,559
0
0
0.00%
0.00%
0.00%
0
0
0
20
934
0
30,448
1.234
37,559
0
0
0.00%
0.00%
0.00%
0
0
0
60
934
0
30,448
1.234
37,559
0
0
0.00%
0.00%
0.00%
0
0
0
100
934
0
30,448
1.234
37,559
0
0
0.00%
0.00%
0.00%
0
0
0
200
934
0
30,448
1.234
37,559
0
0
0.00%
0.00%
0.00%
0
0
0
600
934
0
30,448
1.234
37,559
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
Mixed Water
Systems
0.6
417
125
1,151
2.899
3,337
105
148
29.99%
25.18%
35.49%
1,458
1,132
1,817
2
417
56
1,151
2.899
3,337
48
64
13.36%
11.51%
15.35%
581
370
807
6
417
25
1,151
2.899
3,337
20
31
5.92%
4.80%
7.43%
95
61
213
10
417
13
1,151
2.899
3,337
8
17
3.05%
1.92%
4.08%
35
8
58
20
417
2
1,151
2.899
3,337

4
0.54%
0.24%
0.96%
3

4
60
417
0
1,151
2.899
3,337
0
0
0.00%
0.00%
0.00%
0
0
0
100
417
0
1,151
2.899
3,337
0
0
0.00%
0.00%
0.00%
0
0
0
200
417
0
1,151
2.899
3,337
0
0
0.00%
0.00%
0.00%
0
0
0
600
417
0
1,151
2.899
3,337
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 33 of 114
December 2016

-------
E.2-CL Only
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population Served
by MRs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
39,759,814
8,360,442
162,744,918
0.443
72,077,607
5,996,044
11,534,302
21.03%
15.08%
29.01%
15,172,477
10,626,520
21,022,364
39,759,814
2,597,691
162,744,918
0.443
72,077,607
1,916,222
3,325,388
6.53%
4.82%
8.36%
4,379,176
3,027,896
5,897,016
39,759,814
827,790
162,744,918
0.443
72,077,607
653,394
1,317,242
2.08%
1.64%
3.31%
1,225,042
843,477
1,975,820
39,759,814
455,620
162,744,918
0.443
72,077,607
329,595
614,759
1.15%
0.83%
1.55%
572,105
331,552
944,434
39,759,814
121,163
162,744,918
0.443
72,077,607
11,421
234,430
0.30%
0.03%
0.59%
125,705
13,378
236,387
39,759,814
184
162,744,918
0.443
72,077,607
0
228
0.00%
0.00%
0.00%
572
0
2,185
39,759,814
1
162,744,918
0.443
72,077,607
0
0
0.00%
0.00%
0.00%
8
0
0
39,759,814
0
162,744,918
0.443
72,077,607
0
0
0.00%
0.00%
0.00%
0
0
0
39,759,814
0
162,744,918
0.443
72,077,607
0
0
0.00%
0.00%
0.00%
0
0
0
24,418,492
5,444,236
62,876,111
0.530
33,325,706
3,808,546
7,521,658
22.30%
15.60%
30.80%
8,008,496
5,717,854
10,839,660
24,418,492
1,332,880
62,876,111
0.530
33,325,706
784,244
1,889,840
5.46%
3.21%
7.74%
1,976,051
1,164,620
2,756,075
24,418,492
174,046
62,876,111
0.530
33,325,706
118,230
544,038
0.71%
0.48%
2.23%
298,768
128,975
781,217
24,418,492
105,512
62,876,111
0.530
33,325,706
86,484
150,160
0.43%
0.35%
0.61%
127,630
88,442
300,497
24,418,492
43,505
62,876,111
0.530
33,325,706
228
86,484
0.18%
0.00%
0.35%
45,864
2,185
88,442
24,418,492
45
62,876,111
0.530
33,325,706
0
228
0.00%
0.00%
0.00%
434
0
2,185
24,418,492
1
62,876,111
0.530
33,325,706
0
0
0.00%
0.00%
0.00%
8
0
0
24,418,492
0
62,876,111
0.530
33,325,706
0
0
0.00%
0.00%
0.00%
0
0
0
24,418,492
0
62,876,111
0.530
33,325,706
0
0
0.00%
0.00%
0.00%
0
0
0
6,034,024
464,048
62,564,793
0.361
22,600,697
228,250
757,544
7.69%
3.78%
12.55%
2,073,308
1,026,600
3,365,100
6,034,024
25,250
62,564,793
0.361
22,600,697
2,717
80,934
0.42%
0.05%
1.34%
150,400
13,482
468,341
6,034,024
204
62,564,793
0.361
22,600,697
0
1,025
0.00%
0.00%
0.02%
1,093
0
5,088
6,034,024
2
62,564,793
0.361
22,600,697
0
0
0.00%
0.00%
0.00%
10
0
0
6,034,024
0
62,564,793
0.361
22,600,697
0
0
0.00%
0.00%
0.00%
0
0
0
6,034,024
0
62,564,793
0.361
22,600,697
0
0
0.00%
0.00%
0.00%
0
0
0
6,034,024
0
62,564,793
0.361
22,600,697
0
0
0.00%
0.00%
0.00%
0
0
0
6,034,024
0
62,564,793
0.361
22,600,697
0
0
0.00%
0.00%
0.00%
0
0
0
6,034,024
0
62,564,793
0.361
22,600,697
0
0
0.00%
0.00%
0.00%
0
0
0
9,307,298
2,452,157
37,304,014
0.433
16,151,204
1,959,248
3,255,100
26.35%
21.05%
34.97%
5,090,672
3,882,066
6,817,604
9,307,298
1,239,560
37,304,014
0.433
16,151,204
1,129,261
1,354,614
13.32%
12.13%
14.55%
2,252,726
1,849,795
2,672,600
9,307,298
653,539
37,304,014
0.433
16,151,204
535,164
772,179
7.02%
5.75%
8.30%
925,181
714,502
1,189,515
9,307,298
350,106
37,304,014
0.433
16,151,204
243,111
464,599
3.76%
2.61%
4.99%
444,465
243,111
643,937
9,307,298
77,658
37,304,014
0.433
16,151,204
11,193
147,945
0.83%
0.12%
1.59%
79,841
11,193
147,945
9,307,298
139
37,304,014
0.433
16,151,204
0
0
0.00%
0.00%
0.00%
139
0
0
9,307,298
0
37,304,014
0.433
16,151,204
0
0
0.00%
0.00%
0.00%
0
0
0
9,307,298
0
37,304,014
0.433
16,151,204
0
0
0.00%
0.00%
0.00%
0
0
0
9,307,298
0
37,304,014
0.433
16,151,204
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 34 of 114
December 2016

-------
E.3 - CAOnly



Number of



90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Percentage of
EPs with
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Total Number of
EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of EPs with
Mean Exceeding Threshold -
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs with
Predicted Mean
National #
Systems
EP Ratio
National Number
of EPs
Threshold
Predicted Mean
Exceeding
Threshold - National Extrapolation
National Extrapolation

UCMR 2 EPs
Exceeding
Threshold

Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)

0.6
31
24
849
2.055
1,744
21
29
78.34%
67.74%
93.55%
1,180
984
1,574

2
31
18
849
2.055
1,744
14
20
56.55%
45.16%
64.52%
687
484
904

6
31
10
849
2.055
1,744
7
13
30.75%
22.58%
41.94%
333
206
475

10
31
6
849
2.055
1,744
4
8
20.74%
12.90%
25.81%
204
107
287
All EPs Only
20
31
4
849
2.055
1,744
1
6
11.48%
3.23%
19.35%
100
9
197

60
31
1
849
2.055
1,744
0
1
2.42%
0.00%
3.23%
10
0
9

100
31
0
849
2.055
1,744
0
1
0.69%
0.00%
3.23%
2
0
9

200
31
0
849
2.055
1,744
0
0
0.01%
0.00%
0.00%
0
0
0

600
31
0
849
2.055
1,744
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
15
13
125
1.071
134
11
14
83.55%
73.33%
93.33%
112
98
125

2
15
11
125
1.071
134
9
11
70.12%
60.00%
73.33%
94
81
98

6
15
6
125
1.071
134
5
8
40.54%
33.33%
53.33%
54
45
72
EPs Only at Surface
Water Systems
10
15
4
125
1.071
134
3
5
29.19%
20.00%
33.33%
39
27
45
20
15
3
125
1.071
134
1
4
17.40%
6.67%
26.67%
23
9
36
60
15
1
125
1.071
134
0
1
4.71%
0.00%
6.67%
6
0
9

100
15
0
125
1.071
134
0
1
1.44%
0.00%
6.67%
2
0
9

200
15
0
125
1.071
134
0
0
0.01%
0.00%
0.00%
0
0
0

600
15
0
125
1.071
134
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
4
2
482
1.333
642
1
3
37.64%
25.00%
75.00%
242
161
482

2
4
0
482
1.333
642
0
1
8.47%
0.00%
25.00%
54
0
161

6
4
0
482
1.333
642
0
0
0.23%
0.00%
0.00%
2
0
0
EPs Only at Ground
Water Systems
10
4
0
482
1.333
642
0
0
0.00%
0.00%
0.00%
0
0
0
20
4
0
482
1.333
642
0
0
0.00%
0.00%
0.00%
0
0
0
60
4
0
482
1.333
642
0
0
0.00%
0.00%
0.00%
0
0
0

100
4
0
482
1.333
642
0
0
0.00%
0.00%
0.00%
0
0
0

200
4
0
482
1.333
642
0
0
0.00%
0.00%
0.00%
0
0
0

600
4
0
482
1.333
642
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
12
10
242
4.000
967
9
12
85.41%
75.00%
100.00%
826
726
967

2
12
7
242
4.000
967
5
8
55.62%
41.67%
66.67%
538
403
645

6
12
3
242
4.000
967
2
5
28.68%
16.67%
41.67%
277
161
403
EPs Only at
10
12
2
242
4.000
967
1
3
17.09%
8.33%
25.00%
165
81
242
Mixed Water
20
12
1
242
4.000
967
0
2
7.90%
0.00%
16.67%
76
0
161
Systems
60
12
0
242
4.000
967
0
0
0.36%
0.00%
0.00%
3
0
0

100
12
0
242
4.000
967
0
0
0.00%
0.00%
0.00%
0
0
0

200
12
0
242
4.000
967
0
0
0.00%
0.00%
0.00%
0
0
0

600
12
0
242
4.000
967
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 35 of 114
December 2016

-------
E.3 - CAOnly
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served by
EPs with Mean
Exceeding Threshold
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
47,702
36,561
1,335,490
0.617
824,600
29,264
47,071
76.64%
61.35%
98.68%
583,027
428,968
803,942
47,702
25,811
1,335,490
0.617
824,600
19,890
31,086
54.11%
41.70%
65.17%
326,181
224,169
484,693
47,702
15,082
1,335,490
0.617
824,600
12,291
19,860
31.62%
25.77%
41.63%
161,527
128,680
223,993
47,702
11,786
1,335,490
0.617
824,600
8,189
13,690
24.71%
17.17%
28.70%
116,253
68,793
146,461
47,702
7,631
1,335,490
0.617
824,600
3,300
11,883
16.00%
6.92%
24.91%
65,263
19,336
126,289
47,702
2,360
1,335,490
0.617
824,600
0
3,300
4.95%
0.00%
6.92%
14,722
0
19,336
47,702
711
1,335,490
0.617
824,600
0
3,300
1.49%
0.00%
6.92%
4,164
0
19,336
47,702
6
1,335,490
0.617
824,600
0
0
0.01%
0.00%
0.00%
36
0
0
47,702
0
1,335,490
0.617
824,600
0
0
0.00%
0.00%
0.00%
0
0
0
28,097
22,947
317,258
0.519
164,628
19,776
27,960
81.67%
70.39%
99.51%
134,453
115,875
163,828
28,097
19,178
317,258
0.519
164,628
15,679
19,913
68.26%
55.80%
70.87%
112,370
91,867
116,675
28,097
12,226
317,258
0.519
164,628
10,075
15,649
43.51%
35.86%
55.70%
71,636
59,030
91,691
28,097
9,940
317,258
0.519
164,628
7,375
11,098
35.38%
26.25%
39.50%
58,240
43,209
65,028
28,097
6,827
317,258
0.519
164,628
3,300
9,667
24.30%
11.75%
34.40%
40,000
19,336
56,639
28,097
2,325
317,258
0.519
164,628
0
3,300
8.27%
0.00%
11.75%
13,620
0
19,336
28,097
711
317,258
0.519
164,628
0
3,300
2.53%
0.00%
11.75%
4,164
0
19,336
28,097
6
317,258
0.519
164,628
0
0
0.02%
0.00%
0.00%
36
0
0
28,097
0
317,258
0.519
164,628
0
0
0.00%
0.00%
0.00%
0
0
0
5,055
2,392
405,603
0.500
202,802
1,724
4,560
47.32%
34.11%
90.21%
95,971
69,175
182,943
5,055
619
405,603
0.500
202,802
0
1,950
12.25%
0.00%
38.58%
24,842
0
78,232
5,055
18
405,603
0.500
202,802
0
0
0.36%
0.00%
0.00%
733
0
0
5,055
0
405,603
0.500
202,802
0
0
0.00%
0.00%
0.00%
0
0
0
5,055
0
405,603
0.500
202,802
0
0
0.00%
0.00%
0.00%
0
0
0
5,055
0
405,603
0.500
202,802
0
0
0.00%
0.00%
0.00%
0
0
0
5,055
0
405,603
0.500
202,802
0
0
0.00%
0.00%
0.00%
0
0
0
5,055
0
405,603
0.500
202,802
0
0
0.00%
0.00%
0.00%
0
0
0
5,055
0
405,603
0.500
202,802
0
0
0.00%
0.00%
0.00%
0
0
0
14,550
11,222
612,628
0.746
457,171
7,763
14,550
77.13%
53.35%
100.00%
352,603
243,918
457,171
14,550
6,014
612,628
0.746
457,171
4,211
9,223
41.33%
28.94%
63.39%
188,969
132,302
289,786
14,550
2,838
612,628
0.746
457,171
2,217
4,211
19.50%
15.24%
28.94%
89,158
69,650
132,302
14,550
1,846
612,628
0.746
457,171
814
2,592
12.69%
5.60%
17.81%
58,013
25,584
81,433
14,550
804
612,628
0.746
457,171
0
2,217
5.53%
0.00%
15.24%
25,263
0
69,650
14,550
35
612,628
0.746
457,171
0
0
0.24%
0.00%
0.00%
1,102
0
0
14,550
0
612,628
0.746
457,171
0
0
0.00%
0.00%
0.00%
0
0
0
14,550
0
612,628
0.746
457,171
0
0
0.00%
0.00%
0.00%
0
0
0
14,550
0
612,628
0.746
457,171
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 36 of 114
December 2016

-------
E.3 - CAOnly



Number of



90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Percentage of
MRs with
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Total Number of
MRs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of MRs with
Mean Exceeding Threshold -
Source Water Type
Threshold (ng/L)
Total Number of
UCMR 2 MRs
UCMR 2 MRs with
Predicted Mean
National #
Systems
MR Ratio
National Number
of MRs
Threshold
Predicted Mean
Exceeding
Threshold - National Extrapolation
National Extrapolation


Exceeding
Threshold

Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)

0.6
31
27
849
2.055
1,744
24
31
87.56%
77.42%
100.00%
1,363
1,091
1,744

2
31
23
849
2.055
1,744
20
25
73.20%
64.52%
80.65%
991
760
1,252

6
31
13
849
2.055
1,744
10
16
41.00%
32.26%
51.61%
473
304
653

10
31
10
849
2.055
1,744
7
11
31.46%
22.58%
35.48%
318
206
385
All MRs Only
20
31
6
849
2.055
1,744
5
9
20.04%
16.13%
29.03%
207
188
296

60
31
3
849
2.055
1,744

3
8.29%
3.23%
9.68%
148
81
170

100
31
1
849
2.055
1,744
0
3
3.75%
0.00%
9.68%
75
0
170

200
31
0
849
2.055
1,744
0
1
0.52%
0.00%
3.23%
12
0
81

600
31
0
849
2.055
1,744
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
15
15
125
1.071
134
14
15
97.44%
93.33%
100.00%
131
125
134

2
15
14
125
1.071
134
13
14
91.65%
86.67%
93.33%
123
116
125

6
15
8
125
1.071
134
7
10
53.86%
46.67%
66.67%
72
63
89
MRs Only at
10
15
7
125
1.071
134
5
7
43.93%
33.33%
46.67%
59
45
63
Surface Water
20
15
4
125
1.071
134
3
6
27.34%
20.00%
40.00%
37
27
54
Systems
60
15
1
125
1.071
134
0
1
5.51%
0.00%
6.67%
7
0
9

100
15
0
125
1.071
134
0
1
1.75%
0.00%
6.67%
2
0
9

200
15
0
125
1.071
134
0
0
0.05%
0.00%
0.00%
0
0
0

600
15
0
125
1.071
134
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
4
3
482
1.333
642
2
4
69.57%
50.00%
100.00%
447
321
642

2
4
2
482
1.333
642

3
46.07%
25.00%
75.00%
296
161
482

6
4
0
482
1.333
642
0
1
8.66%
0.00%
25.00%
56
0
161
MRs Only at
10
4
0
482
1.333
642
0
0
1.12%
0.00%
0.00%
7
0
0
Ground Water
20
4
0
482
1.333
642
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
4
0
482
1.333
642
0
0
0.00%
0.00%
0.00%
0
0
0

100
4
0
482
1.333
642
0
0
0.00%
0.00%
0.00%
0
0
0

200
4
0
482
1.333
642
0
0
0.00%
0.00%
0.00%
0
0
0

600
4
0
482
1.333
642
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
12
10
242
4.000
967
8
12
81.21%
66.67%
100.00%
786
645
967

2
12
7
242
4.000
967
6
8
59.19%
50.00%
66.67%
573
484
645

6
12
4
242
4.000
967
3
5
35.71%
25.00%
41.67%
345
242
403
MRs Only at
10
12
3
242
4.000
967
2
4
25.98%
16.67%
33.33%
251
161
322
Mixed Water
20
12
2
242
4.000
967
2
3
17.59%
16.67%
25.00%
170
161
242
Systems
60
12
2
242
4.000
967

2
14.54%
8.33%
16.67%
141
81
161

100
12
1
242
4.000
967
0
2
7.49%
0.00%
16.67%
72
0
161

200
12
0
242
4.000
967
0
1
1.28%
0.00%
8.33%
12
0
81

600
12
0
242
4.000
967
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 37 of 114
December 2016

-------
E.3 - CAOnly
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
47,702
42,159
1,335,490
0.617
824,600
35,822
47,702
88.38%
75.09%
100.00%
647,911
458,005
824,600
47,702
34,908
1,335,490
0.617
824,600
27,355
40,672
73.18%
57.35%
85.26%
442,899
293,872
621,766
47,702
20,918
1,335,490
0.617
824,600
17,973
26,599
43.85%
37.68%
55.76%
235,784
182,784
346,812
47,702
17,583
1,335,490
0.617
824,600
15,363
18,940
36.86%
32.21%
39.70%
178,384
131,639
209,662
47,702
12,035
1,335,490
0.617
824,600
8,395
16,226
25.23%
17.60%
34.02%
114,907
90,815
157,914
47,702
4,108
1,335,490
0.617
824,600
814
4,929
8.61%
1.71%
10.33%
60,393
25,584
70,503
47,702
1,592
1,335,490
0.617
824,600
0
4,929
3.34%
0.00%
10.33%
28,038
0
70,503
47,702
150
1,335,490
0.617
824,600
0
814
0.31%
0.00%
1.71%
4,073
0
25,584
47,702
0
1,335,490
0.617
824,600
0
0
0.00%
0.00%
0.00%
0
0
0
28,097
27,655
317,258
0.519
164,628
26,947
28,097
98.43%
95.91%
100.00%
162,041
157,889
164,628
28,097
26,342
317,258
0.519
164,628
22,297
26,947
93.75%
79.36%
95.91%
154,346
130,644
157,889
28,097
16,636
317,258
0.519
164,628
14,942
19,791
59.21%
53.18%
70.44%
97,473
87,550
115,964
28,097
14,652
317,258
0.519
164,628
13,734
15,079
52.15%
48.88%
53.67%
85,853
80,472
88,350
28,097
10,298
317,258
0.519
164,628
6,767
13,768
36.65%
24.08%
49.00%
60,341
39,647
80,668
28,097
2,687
317,258
0.519
164,628
0
3,300
9.56%
0.00%
11.75%
15,741
0
19,336
28,097
860
317,258
0.519
164,628
0
3,300
3.06%
0.00%
11.75%
5,041
0
19,336
28,097
25
317,258
0.519
164,628
0
0
0.09%
0.00%
0.00%
145
0
0
28,097
0
317,258
0.519
164,628
0
0
0.00%
0.00%
0.00%
0
0
0
5,055
3,467
405,603
0.500
202,802
2,445
5,055
68.58%
48.37%
100.00%
139,073
98,091
202,802
5,055
2,232
405,603
0.500
202,802
495
3,750
44.16%
9.79%
74.18%
89,554
19,859
150,446
5,055
430
405,603
0.500
202,802
0
1,950
8.51%
0.00%
38.58%
17,265
0
78,232
5,055
52
405,603
0.500
202,802
0
0
1.03%
0.00%
0.00%
2,095
0
0
5,055
0
405,603
0.500
202,802
0
0
0.00%
0.00%
0.00%
0
0
0
5,055
0
405,603
0.500
202,802
0
0
0.00%
0.00%
0.00%
0
0
0
5,055
0
405,603
0.500
202,802
0
0
0.00%
0.00%
0.00%
0
0
0
5,055
0
405,603
0.500
202,802
0
0
0.00%
0.00%
0.00%
0
0
0
5,055
0
405,603
0.500
202,802
0
0
0.00%
0.00%
0.00%
0
0
0
14,550
11,037
612,628
0.746
457,171
6,430
14,550
75.86%
44.19%
100.00%
346,797
202,025
457,171
14,550
6,334
612,628
0.746
457,171
4,563
9,976
43.53%
31.36%
68.56%
198,999
143,370
313,431
14,550
3,853
612,628
0.746
457,171
3,031
4,857
26.48%
20.83%
33.38%
121,046
95,234
152,615
14,550
2,878
612,628
0.746
457,171
1,629
3,861
19.78%
11.19%
26.54%
90,437
51,168
121,313
14,550
1,737
612,628
0.746
457,171
1,629
2,459
11.94%
11.19%
16.90%
54,566
51,168
77,246
14,550
1,421
612,628
0.746
457,171
814
1,629
9.77%
5.60%
11.19%
44,652
25,584
51,168
14,550
732
612,628
0.746
457,171
0
1,629
5.03%
0.00%
11.19%
22,997
0
51,168
14,550
125
612,628
0.746
457,171
0
814
0.86%
0.00%
5.60%
3,929
0
25,584
14,550
0
612,628
0.746
457,171
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 38 of 114
December 2016

-------
E.3 - CAOnly



Number of



90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Percentage of
EPs with
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Total Number of
EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of EPs with
Mean Exceeding Threshold -
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs with
Predicted Mean
National #
Systems
EP Ratio
National Number
of EPs
Threshold
Predicted Mean
Exceeding
Threshold - National Extrapolation
National Extrapolation

UCMR 2 EPs
Exceeding
Threshold

Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)

0.6
91
47
435
1.969
856
37
58
51.69%
40.66%
63.74%
469
361
580

2
91
23
435
1.969
856
18
29
25.09%
19.78%
31.87%
214
159
280

6
91
9
435
1.969
856
5
13
9.41%
5.49%
14.29%
71
31
114

10
91
5
435
1.969
856
3
8
5.30%
3.30%
8.79%
38
18
66
All EPs Only
20
91
2
435
1.969
856
1
3
2.47%
1.10%
3.30%
14
6
18

60
91
0
435
1.969
856
0
1
0.18%
0.00%
1.10%
1
0
6

100
91
0
435
1.969
856
0
0
0.01%
0.00%
0.00%
0
0
0

200
91
0
435
1.969
856
0
0
0.00%
0.00%
0.00%
0
0
0

600
91
0
435
1.969
856
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
44
26
183
1.467
268
22
30
58.86%
50.00%
68.18%
158
134
183

2
44
15
183
1.467
268
13
17
33.42%
29.55%
38.64%
90
79
104

6
44
7
183
1.467
268
5
9
15.47%
11.36%
20.45%
42
31
55
EPs Only at Surface
Water Systems
10
44
4
183
1.467
268
3
6
9.51%
6.82%
13.64%
26
18
37
20
44
2
183
1.467
268
1
3
4.99%
2.27%
6.82%
13
6
18
60
44
0
183
1.467
268
0
1
0.37%
0.00%
2.27%
1
0
6

100
44
0
183
1.467
268
0
0
0.03%
0.00%
0.00%
0
0
0

200
44
0
183
1.467
268
0
0
0.00%
0.00%
0.00%
0
0
0

600
44
0
183
1.467
268
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
31
10
166
1.476
245
7
15
33.71%
22.58%
48.39%
83
55
119

2
31
4
166
1.476
245
2
6
11.99%
6.45%
19.35%
29
16
47

6
31
1
166
1.476
245
0
2
1.84%
0.00%
6.45%
5
0
16
EPs Only at Ground
Water Systems
10
31
0
166
1.476
245
0
1
0.36%
0.00%
3.23%
1
0
8
20
31
0
166
1.476
245
0
0
0.01%
0.00%
0.00%
0
0
0
60
31
0
166
1.476
245
0
0
0.00%
0.00%
0.00%
0
0
0

100
31
0
166
1.476
245
0
0
0.00%
0.00%
0.00%
0
0
0

200
31
0
166
1.476
245
0
0
0.00%
0.00%
0.00%
0
0
0

600
31
0
166
1.476
245
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
16
11
86
4.000
342
8
13
66.81%
50.00%
81.25%
229
171
278

2
16
4
86
4.000
342
3
6
27.57%
18.75%
37.50%
94
64
128

6
16
1
86
4.000
342
0
2
7.41%
0.00%
12.50%
25
0
43
EPs Only at
10
16
1
86
4.000
342
0
1
3.28%
0.00%
6.25%
11
0
21
Mixed Water
20
16
0
86
4.000
342
0
0
0.28%
0.00%
0.00%
1
0
0
Systems
60
16
0
86
4.000
342
0
0
0.00%
0.00%
0.00%
0
0
0

100
16
0
86
4.000
342
0
0
0.00%
0.00%
0.00%
0
0
0

200
16
0
86
4.000
342
0
0
0.00%
0.00%
0.00%
0
0
0

600
16
0
86
4.000
342
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 39 of 114
December 2016

-------
E.3 - CAOnly
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served by
EPs with Mean
Exceeding Threshold
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
1,601,245
885,775
13,281,323
0.571
7,588,200
697,482
1,082,220
55.32%
43.56%
67.59%
4,414,245
3,456,623
5,400,493
1,601,245
448,516
13,281,323
0.571
7,588,200
325,591
588,461
28.01%
20.33%
36.75%
2,171,194
1,566,413
2,910,397
1,601,245
169,009
13,281,323
0.571
7,588,200
95,942
240,749
10.55%
5.99%
15.04%
830,905
364,873
1,146,478
1,601,245
98,257
13,281,323
0.571
7,588,200
57,881
150,913
6.14%
3.61%
9.42%
469,821
220,123
766,218
1,601,245
38,923
13,281,323
0.571
7,588,200
6,801
57,881
2.43%
0.42%
3.61%
156,588
25,863
220,123
1,601,245
1,318
13,281,323
0.571
7,588,200
0
6,801
0.08%
0.00%
0.42%
5,012
0
25,863
1,601,245
76
13,281,323
0.571
7,588,200
0
0
0.00%
0.00%
0.00%
291
0
0
1,601,245
0
13,281,323
0.571
7,588,200
0
0
0.00%
0.00%
0.00%
0
0
0
1,601,245
0
13,281,323
0.571
7,588,200
0
0
0.00%
0.00%
0.00%
0
0
0
826,084
532,193
6,122,088
0.513
3,141,632
452,774
612,748
64.42%
54.81%
74.18%
2,023,955
1,721,919
2,330,306
826,084
308,574
6,122,088
0.513
3,141,632
247,031
372,084
37.35%
29.90%
45.04%
1,173,520
939,470
1,415,053
826,084
132,249
6,122,088
0.513
3,141,632
95,942
175,985
16.01%
11.61%
21.30%
502,947
364,873
669,277
826,084
82,645
6,122,088
0.513
3,141,632
57,881
107,652
10.00%
7.01%
13.03%
314,304
220,123
409,405
826,084
37,649
6,122,088
0.513
3,141,632
6,801
57,881
4.56%
0.82%
7.01%
143,179
25,863
220,123
826,084
1,318
6,122,088
0.513
3,141,632
0
6,801
0.16%
0.00%
0.82%
5,012
0
25,863
826,084
76
6,122,088
0.513
3,141,632
0
0
0.01%
0.00%
0.00%
291
0
0
826,084
0
6,122,088
0.513
3,141,632
0
0
0.00%
0.00%
0.00%
0
0
0
826,084
0
6,122,088
0.513
3,141,632
0
0
0.00%
0.00%
0.00%
0
0
0
572,142
208,764
4,295,660
0.522
2,242,948
132,883
292,124
36.49%
23.23%
51.06%
818,410
520,938
1,145,202
572,142
75,179
4,295,660
0.522
2,242,948
32,559
123,055
13.14%
5.69%
21.51%
294,722
127,640
482,407
572,142
10,247
4,295,660
0.522
2,242,948
0
32,559
1.79%
0.00%
5.69%
40,171
0
127,640
572,142
2,010
4,295,660
0.522
2,242,948
0
16,261
0.35%
0.00%
2.84%
7,878
0
63,749
572,142
61
4,295,660
0.522
2,242,948
0
0
0.01%
0.00%
0.00%
238
0
0
572,142
0
4,295,660
0.522
2,242,948
0
0
0.00%
0.00%
0.00%
0
0
0
572,142
0
4,295,660
0.522
2,242,948
0
0
0.00%
0.00%
0.00%
0
0
0
572,142
0
4,295,660
0.522
2,242,948
0
0
0.00%
0.00%
0.00%
0
0
0
572,142
0
4,295,660
0.522
2,242,948
0
0
0.00%
0.00%
0.00%
0
0
0
203,019
144,817
2,863,575
0.770
2,203,619
111,824
177,349
71.33%
55.08%
87.36%
1,571,881
1,213,765
1,924,985
203,019
64,763
2,863,575
0.770
2,203,619
46,001
93,322
31.90%
22.66%
45.97%
702,952
499,304
1,012,938
203,019
26,514
2,863,575
0.770
2,203,619
0
32,205
13.06%
0.00%
15.86%
287,787
0
349,562
203,019
13,602
2,863,575
0.770
2,203,619
0
27,000
6.70%
0.00%
13.30%
147,639
0
293,064
203,019
1,213
2,863,575
0.770
2,203,619
0
0
0.60%
0.00%
0.00%
13,171
0
0
203,019
0
2,863,575
0.770
2,203,619
0
0
0.00%
0.00%
0.00%
0
0
0
203,019
0
2,863,575
0.770
2,203,619
0
0
0.00%
0.00%
0.00%
0
0
0
203,019
0
2,863,575
0.770
2,203,619
0
0
0.00%
0.00%
0.00%
0
0
0
203,019
0
2,863,575
0.770
2,203,619
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 40 of 114
December 2016

-------
E.3 - CAOnly



Number of



90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Percentage of
MRs with
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Total Number of
MRs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of MRs with
Mean Exceeding Threshold -
Source Water Type
Threshold (ng/L)
Total Number of
UCMR 2 MRs
UCMR 2 MRs with
Predicted Mean
National #
Systems
MR Ratio
National Number
of MRs
Threshold
Predicted Mean
Exceeding
Threshold - National Extrapolation
National Extrapolation


Exceeding
Threshold

Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)

0.6
75
58
435
1.451
630
50
65
77.28%
66.67%
86.67%
501
430
553

2
75
35
435
1.451
630
28
41
46.28%
37.33%
54.67%
315
253
372

6
75
14
435
1.451
630
9
20
19.33%
12.00%
26.67%
130
70
189

10
75
7
435
1.451
630
3
10
9.01%
4.00%
13.33%
57
18
93
All MRs Only
20
75
2
435
1.451
630
0
3
2.04%
0.00%
4.00%
10
0
18

60
75
0
435
1.451
630
0
0
0.01%
0.00%
0.00%
0
0
0

100
75
0
435
1.451
630
0
0
0.00%
0.00%
0.00%
0
0
0

200
75
0
435
1.451
630
0
0
0.00%
0.00%
0.00%
0
0
0

600
75
0
435
1.451
630
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
39
36
183
1.300
238
33
38
91.11%
84.62%
97.44%
217
201
232

2
39
23
183
1.300
238
20
26
59.44%
51.28%
66.67%
141
122
159

6
39
10
183
1.300
238
8
13
26.72%
20.51%
33.33%
64
49
79
MRs Only at
10
39
5
183
1.300
238
3
7
13.71%
7.69%
17.95%
33
18
43
Surface Water
20
39
1
183
1.300
238
0
3
3.79%
0.00%
7.69%
9
0
18
Systems
60
39
0
183
1.300
238
0
0
0.02%
0.00%
0.00%
0
0
0

100
39
0
183
1.300
238
0
0
0.00%
0.00%
0.00%
0
0
0

200
39
0
183
1.300
238
0
0
0.00%
0.00%
0.00%
0
0
0

600
39
0
183
1.300
238
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
28
14
166
1.333
221
10
19
51.75%
35.71%
67.86%
114
79
150

2
28
5
166
1.333
221
3
8
19.30%
10.71%
28.57%
43
24
63

6
28
2
166
1.333
221
0
3
5.48%
0.00%
10.71%
12
0
24
MRs Only at
10
28
0
166
1.333
221
0
1
1.60%
0.00%
3.57%
4
0
8
Ground Water
20
28
0
166
1.333
221
0
0
0.07%
0.00%
0.00%
0
0
0
Systems
60
28
0
166
1.333
221
0
0
0.00%
0.00%
0.00%
0
0
0

100
28
0
166
1.333
221
0
0
0.00%
0.00%
0.00%
0
0
0

200
28
0
166
1.333
221
0
0
0.00%
0.00%
0.00%
0
0
0

600
28
0
166
1.333
221
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
8
8
86
2.000
171
7
8
99.20%
87.50%
100.00%
170
150
171

2
8
6
86
2.000
171
5
7
76.59%
62.50%
87.50%
131
107
150

6
8
3
86
2.000
171

4
31.79%
12.50%
50.00%
54
21
86
MRs Only at
10
8
1
86
2.000
171
0
2
12.03%
0.00%
25.00%
21
0
43
Mixed Water
20
8
0
86
2.000
171
0
0
0.42%
0.00%
0.00%
1
0
0
Systems
60
8
0
86
2.000
171
0
0
0.00%
0.00%
0.00%
0
0
0

100
8
0
86
2.000
171
0
0
0.00%
0.00%
0.00%
0
0
0

200
8
0
86
2.000
171
0
0
0.00%
0.00%
0.00%
0
0
0

600
8
0
86
2.000
171
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 41 of 114
December 2016

-------
E.3 - CAOnly
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
1,410,048
1,108,894
13,281,323
0.463
6,148,216
961,857
1,250,772
78.64%
68.21%
88.70%
4,973,027
4,375,430
5,525,734
1,410,048
667,310
13,281,323
0.463
6,148,216
548,571
799,591
47.33%
38.90%
56.71%
3,210,897
2,714,956
3,754,465
1,410,048
286,430
13,281,323
0.463
6,148,216
170,075
405,683
20.31%
12.06%
28.77%
1,432,918
837,186
2,074,268
1,410,048
130,089
13,281,323
0.463
6,148,216
57,881
218,290
9.23%
4.10%
15.48%
633,443
220,123
1,113,494
1,410,048
27,958
13,281,323
0.463
6,148,216
0
57,881
1.98%
0.00%
4.10%
111,838
0
220,123
1,410,048
176
13,281,323
0.463
6,148,216
0
0
0.01%
0.00%
0.00%
671
0
0
1,410,048
0
13,281,323
0.463
6,148,216
0
0
0.00%
0.00%
0.00%
0
0
0
1,410,048
0
13,281,323
0.463
6,148,216
0
0
0.00%
0.00%
0.00%
0
0
0
1,410,048
0
13,281,323
0.463
6,148,216
0
0
0.00%
0.00%
0.00%
0
0
0
783,703
718,920
6,122,088
0.487
2,980,456
669,553
767,319
91.73%
85.43%
97.91%
2,734,085
2,546,339
2,918,146
783,703
463,800
6,122,088
0.487
2,980,456
397,438
540,231
59.18%
50.71%
68.93%
1,763,851
1,511,474
2,054,523
783,703
209,229
6,122,088
0.487
2,980,456
143,075
268,345
26.70%
18.26%
34.24%
795,706
544,121
1,020,528
783,703
102,931
6,122,088
0.487
2,980,456
57,881
148,158
13.13%
7.39%
18.90%
391,451
220,123
563,450
783,703
26,846
6,122,088
0.487
2,980,456
0
57,881
3.43%
0.00%
7.39%
102,098
0
220,123
783,703
176
6,122,088
0.487
2,980,456
0
0
0.02%
0.00%
0.00%
671
0
0
783,703
0
6,122,088
0.487
2,980,456
0
0
0.00%
0.00%
0.00%
0
0
0
783,703
0
6,122,088
0.487
2,980,456
0
0
0.00%
0.00%
0.00%
0
0
0
783,703
0
6,122,088
0.487
2,980,456
0
0
0.00%
0.00%
0.00%
0
0
0
523,616
287,559
4,295,660
0.478
2,052,711
193,777
380,724
54.92%
37.01%
72.71%
1,127,308
759,655
1,492,540
523,616
109,880
4,295,660
0.478
2,052,711
63,017
160,833
20.98%
12.03%
30.72%
430,758
247,041
630,507
523,616
28,952
4,295,660
0.478
2,052,711
0
63,017
5.53%
0.00%
12.03%
113,498
0
247,041
523,616
7,613
4,295,660
0.478
2,052,711
0
30,458
1.45%
0.00%
5.82%
29,844
0
119,401
523,616
336
4,295,660
0.478
2,052,711
0
0
0.06%
0.00%
0.00%
1,317
0
0
523,616
0
4,295,660
0.478
2,052,711
0
0
0.00%
0.00%
0.00%
0
0
0
523,616
0
4,295,660
0.478
2,052,711
0
0
0.00%
0.00%
0.00%
0
0
0
523,616
0
4,295,660
0.478
2,052,711
0
0
0.00%
0.00%
0.00%
0
0
0
523,616
0
4,295,660
0.478
2,052,711
0
0
0.00%
0.00%
0.00%
0
0
0
102,729
102,415
2,863,575
0.389
1,115,048
98,527
102,729
99.69%
95.91%
100.00%
1,111,634
1,069,435
1,115,048
102,729
93,631
2,863,575
0.389
1,115,048
88,117
98,527
91.14%
85.78%
95.91%
1,016,288
956,440
1,069,435
102,729
48,250
2,863,575
0.389
1,115,048
27,000
74,321
46.97%
26.28%
72.35%
523,715
293,064
806,698
102,729
19,545
2,863,575
0.389
1,115,048
0
39,675
19.03%
0.00%
38.62%
212,147
0
430,642
102,729
776
2,863,575
0.389
1,115,048
0
0
0.76%
0.00%
0.00%
8,423
0
0
102,729
0
2,863,575
0.389
1,115,048
0
0
0.00%
0.00%
0.00%
0
0
0
102,729
0
2,863,575
0.389
1,115,048
0
0
0.00%
0.00%
0.00%
0
0
0
102,729
0
2,863,575
0.389
1,115,048
0
0
0.00%
0.00%
0.00%
0
0
0
102,729
0
2,863,575
0.389
1,115,048
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 42 of 114
December 2016

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E.3 - CAOnly



Number of



90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Percentage of
EPs with
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Total Number of
EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of EPs with
Mean Exceeding Threshold -
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs with
Predicted Mean
National #
Systems
EP Ratio
National Number
of EPs
Threshold
Predicted Mean
Exceeding
Threshold - National Extrapolation
National Extrapolation

UCMR 2 EPs
Exceeding
Threshold

Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
450
211
129
3.488
450
186
240
46.99%
41.33%
53.33%
211
186
240

2
450
90
129
3.488
450
78
104
20.08%
17.33%
23.11%
90
78
104

6
450
24
129
3.488
450
18
31
5.33%
4.00%
6.89%
24
18
31

10
450
14
129
3.488
450
10
18
3.04%
2.22%
4.00%
14
10
18
All EPs Only
20
450
4
129
3.488
450
1
7
0.95%
0.22%
1.56%
4
1
7

60
450
0
129
3.488
450
0
1
0.09%
0.00%
0.22%
0
0
1

100
450
0
129
3.488
450
0
0
0.01%
0.00%
0.08%
0
0
0

200
450
0
129
3.488
450
0
0
0.00%
0.00%
0.00%
0
0
0

600
450
0
129
3.488
450
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
142
79
84
1.690
142
71
87
55.35%
50.00%
61.27%
79
71
87

2
142
39
84
1.690
142
35
44
27.60%
24.65%
30.99%
39
35
44

6
142
13
84
1.690
142
10
16
9.15%
7.04%
11.27%
13
10
16
EPs Only at Surface
Water Systems
10
142
7
84
1.690
142
5
9
4.95%
3.52%
6.34%
7
5
9
20
142
3
84
1.690
142
1
4
1.84%
0.70%
2.82%
3
1
4
60
142
0
84
1.690
142
0
1
0.29%
0.00%
0.70%
0
0
1

100
142
0
84
1.690
142
0
0
0.04%
0.00%
0.25%
0
0
0

200
142
0
84
1.690
142
0
0
0.00%
0.00%
0.00%
0
0
0

600
142
0
84
1.690
142
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
68
12
17
4.000
68
6
18
17.01%
8.82%
26.47%
12
6
18

2
68
3
17
4.000
68
1
5
3.92%
1.47%
7.35%
3
1
5

6
68
0
17
4.000
68
0
1
0.27%
0.00%
1.47%
0
0
1
EPs Only at Ground
Water Systems
10
68
0
17
4.000
68
0
0
0.02%
0.00%
0.00%
0
0
0
20
68
0
17
4.000
68
0
0
0.00%
0.00%
0.00%
0
0
0
60
68
0
17
4.000
68
0
0
0.00%
0.00%
0.00%
0
0
0

100
68
0
17
4.000
68
0
0
0.00%
0.00%
0.00%
0
0
0

200
68
0
17
4.000
68
0
0
0.00%
0.00%
0.00%
0
0
0

600
68
0
17
4.000
68
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
240
121
28
8.571
240
109
135
50.53%
45.42%
56.25%
121
109
135

2
240
49
28
8.571
240
42
55
20.21%
17.50%
22.92%
49
42
55

6
240
11
28
8.571
240
8
14
4.50%
3.33%
5.83%
11
8
14
EPs Only at
10
240
7
28
8.571
240
5
9
2.76%
2.08%
3.75%
7
5
9
Mixed Water
20
240
2
28
8.571
240
0
3
0.70%
0.00%
1.25%
2
0
3
Systems
60
240
0
28
8.571
240
0
0
0.00%
0.00%
0.00%
0
0
0

100
240
0
28
8.571
240
0
0
0.00%
0.00%
0.00%
0
0
0

200
240
0
28
8.571
240
0
0
0.00%
0.00%
0.00%
0
0
0

600
240
0
28
8.571
240
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 43 of 114
December 2016

-------
E.3 - CAOnly
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served by
EPs with Mean
Exceeding Threshold
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
25,194,034
11,956,397
40,196,393
0.627
25,194,034
10,017,345
14,374,717
47.46%
39.76%
57.06%
11,956,397
10,017,345
14,374,717
25,194,034
5,043,281
40,196,393
0.627
25,194,034
4,242,115
5,892,925
20.02%
16.84%
23.39%
5,043,281
4,242,115
5,892,925
25,194,034
1,747,617
40,196,393
0.627
25,194,034
1,328,556
2,360,861
6.94%
5.27%
9.37%
1,747,617
1,328,556
2,360,861
25,194,034
1,010,433
40,196,393
0.627
25,194,034
686,922
1,344,326
4.01%
2.73%
5.34%
1,010,433
686,922
1,344,326
25,194,034
368,139
40,196,393
0.627
25,194,034
50,942
685,464
1.46%
0.20%
2.72%
368,139
50,942
685,464
25,194,034
27,658
40,196,393
0.627
25,194,034
0
50,942
0.11%
0.00%
0.20%
27,658
0
50,942
25,194,034
2,916
40,196,393
0.627
25,194,034
0
17,830
0.01%
0.00%
0.07%
2,916
0
17,830
25,194,034
0
40,196,393
0.627
25,194,034
0
0
0.00%
0.00%
0.00%
0
0
0
25,194,034
0
40,196,393
0.627
25,194,034
0
0
0.00%
0.00%
0.00%
0
0
0
17,311,212
8,686,134
30,089,884
0.575
17,311,212
7,417,753
10,067,724
50.18%
42.85%
58.16%
8,686,134
7,417,753
10,067,724
17,311,212
3,699,985
30,089,884
0.575
17,311,212
3,213,907
4,235,967
21.37%
18.57%
24.47%
3,699,985
3,213,907
4,235,967
17,311,212
1,350,381
30,089,884
0.575
17,311,212
1,036,616
1,709,366
7.80%
5.99%
9.87%
1,350,381
1,036,616
1,709,366
17,311,212
764,697
30,089,884
0.575
17,311,212
501,991
1,039,922
4.42%
2.90%
6.01%
764,697
501,991
1,039,922
17,311,212
306,357
30,089,884
0.575
17,311,212
50,942
574,505
1.77%
0.29%
3.32%
306,357
50,942
574,505
17,311,212
27,658
30,089,884
0.575
17,311,212
0
50,942
0.16%
0.00%
0.29%
27,658
0
50,942
17,311,212
2,916
30,089,884
0.575
17,311,212
0
17,830
0.02%
0.00%
0.10%
2,916
0
17,830
17,311,212
0
30,089,884
0.575
17,311,212
0
0
0.00%
0.00%
0.00%
0
0
0
17,311,212
0
30,089,884
0.575
17,311,212
0
0
0.00%
0.00%
0.00%
0
0
0
2,881,974
673,788
5,268,728
0.547
2,881,974
302,275
1,360,789
23.38%
10.49%
47.22%
673,788
302,275
1,360,789
2,881,974
172,846
5,268,728
0.547
2,881,974
33,462
295,350
6.00%
1.16%
10.25%
172,846
33,462
295,350
2,881,974
15,378
5,268,728
0.547
2,881,974
0
111,985
0.53%
0.00%
3.89%
15,378
0
111,985
2,881,974
1,446
5,268,728
0.547
2,881,974
0
0
0.05%
0.00%
0.00%
1,446
0
0
2,881,974
0
5,268,728
0.547
2,881,974
0
0
0.00%
0.00%
0.00%
0
0
0
2,881,974
0
5,268,728
0.547
2,881,974
0
0
0.00%
0.00%
0.00%
0
0
0
2,881,974
0
5,268,728
0.547
2,881,974
0
0
0.00%
0.00%
0.00%
0
0
0
2,881,974
0
5,268,728
0.547
2,881,974
0
0
0.00%
0.00%
0.00%
0
0
0
2,881,974
0
5,268,728
0.547
2,881,974
0
0
0.00%
0.00%
0.00%
0
0
0
5,000,848
2,596,475
4,837,781
1.034
5,000,848
2,297,316
2,946,204
51.92%
45.94%
58.91%
2,596,475
2,297,316
2,946,204
5,000,848
1,170,451
4,837,781
1.034
5,000,848
994,747
1,361,608
23.41%
19.89%
27.23%
1,170,451
994,747
1,361,608
5,000,848
381,857
4,837,781
1.034
5,000,848
291,940
539,510
7.64%
5.84%
10.79%
381,857
291,940
539,510
5,000,848
244,290
4,837,781
1.034
5,000,848
184,932
304,404
4.88%
3.70%
6.09%
244,290
184,932
304,404
5,000,848
61,782
4,837,781
1.034
5,000,848
0
110,959
1.24%
0.00%
2.22%
61,782
0
110,959
5,000,848
0
4,837,781
1.034
5,000,848
0
0
0.00%
0.00%
0.00%
0
0
0
5,000,848
0
4,837,781
1.034
5,000,848
0
0
0.00%
0.00%
0.00%
0
0
0
5,000,848
0
4,837,781
1.034
5,000,848
0
0
0.00%
0.00%
0.00%
0
0
0
5,000,848
0
4,837,781
1.034
5,000,848
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 44 of 114
December 2016

-------
E.3 - CAOnly



Number of



90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Percentage of
MRs with
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Total Number of
MRs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of MRs with
Mean Exceeding Threshold -
Source Water Type
Threshold (ng/L)
Total Number of
UCMR 2 MRs
UCMR 2 MRs with
Predicted Mean
National #
Systems
MR Ratio
National Number
of MRs
Threshold
Predicted Mean
Exceeding
Threshold - National Extrapolation
National Extrapolation


Exceeding
Threshold

Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
288
241
129
2.233
288
225
258
83.74%
78.13%
89.58%
241
225
258

2
288
149
129
2.233
288
135
164
51.67%
46.88%
56.94%
149
135
164

6
288
37
129
2.233
288
29
46
12.74%
10.07%
15.97%
37
29
46

10
288
17
129
2.233
288
12
23
5.89%
4.17%
7.99%
17
12
23
All MRs Only
20
288
5
129
2.233
288
2
9
1.82%
0.69%
3.13%
5
2
9

60
288
1
129
2.233
288
0
1
0.24%
0.00%
0.35%
1
0
1

100
288
0
129
2.233
288
0
1
0.06%
0.00%
0.35%
0
0
1

200
288
0
129
2.233
288
0
0
0.00%
0.00%
0.00%
0
0
0

600
288
0
129
2.233
288
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
131
119
84
1.560
131
114
124
90.85%
87.02%
94.66%
119
114
124

2
131
82
84
1.560
131
77
88
62.72%
58.78%
67.18%
82
77
88

6
131
24
84
1.560
131
20
28
18.31%
15.27%
21.37%
24
20
28
MRs Only at
10
131
11
84
1.560
131
8
14
8.47%
6.11%
10.69%
11
8
14
Surface Water
20
131
3
84
1.560
131

5
2.15%
0.76%
3.82%
3

5
Systems
60
131
1
84
1.560
131
0
1
0.52%
0.00%
0.76%
1
0
1

100
131
0
84
1.560
131
0
1
0.13%
0.00%
0.76%
0
0
1

200
131
0
84
1.560
131
0
0
0.00%
0.00%
0.00%
0
0
0

600
131
0
84
1.560
131
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
32
21
17
1.882
32
17
26
65.99%
53.13%
81.25%
21
17
26

2
32
9
17
1.882
32
6
13
28.76%
18.75%
40.63%
9
6
13

6
32
1
17
1.882
32
0
2
2.13%
0.00%
6.25%
1
0
2
MRs Only at
10
32
0
17
1.882
32
0
1
0.19%
0.00%
3.13%
0
0
1
Ground Water
20
32
0
17
1.882
32
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
32
0
17
1.882
32
0
0
0.00%
0.00%
0.00%
0
0
0

100
32
0
17
1.882
32
0
0
0.00%
0.00%
0.00%
0
0
0

200
32
0
17
1.882
32
0
0
0.00%
0.00%
0.00%
0
0
0

600
32
0
17
1.882
32
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
125
101
28
4.464
125
94
108
80.84%
75.20%
86.40%
101
94
108

2
125
57
28
4.464
125
52
63
45.94%
41.60%
50.40%
57
52
63

6
125
12
28
4.464
125
9
16
9.61%
7.20%
12.80%
12
9
16
MRs Only at
10
125
6
28
4.464
125
4
8
4.63%
3.20%
6.40%
6
4
8
Mixed Water
20
125
2
28
4.464
125

4
1.94%
0.80%
3.20%
2

4
Systems
60
125
0
28
4.464
125
0
0
0.01%
0.00%
0.00%
0
0
0

100
125
0
28
4.464
125
0
0
0.00%
0.00%
0.00%
0
0
0

200
125
0
28
4.464
125
0
0
0.00%
0.00%
0.00%
0
0
0

600
125
0
28
4.464
125
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 45 of 114
December 2016

-------
E.3 - CAOnly
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
20,826,415
18,276,284
40,196,393
0.518
20,826,415
16,648,062
19,485,092
87.76%
79.94%
93.56%
18,276,284
16,648,062
19,485,092
20,826,415
11,192,412
40,196,393
0.518
20,826,415
9,784,918
12,765,918
53.74%
46.98%
61.30%
11,192,412
9,784,918
12,765,918
20,826,415
2,759,467
40,196,393
0.518
20,826,415
2,060,309
3,946,614
13.25%
9.89%
18.95%
2,759,467
2,060,309
3,946,614
20,826,415
1,298,035
40,196,393
0.518
20,826,415
854,492
1,748,342
6.23%
4.10%
8.39%
1,298,035
854,492
1,748,342
20,826,415
364,379
40,196,393
0.518
20,826,415
87,928
713,064
1.75%
0.42%
3.42%
364,379
87,928
713,064
20,826,415
34,810
40,196,393
0.518
20,826,415
0
50,942
0.17%
0.00%
0.24%
34,810
0
50,942
20,826,415
8,395
40,196,393
0.518
20,826,415
0
50,942
0.04%
0.00%
0.24%
8,395
0
50,942
20,826,415
0
40,196,393
0.518
20,826,415
0
0
0.00%
0.00%
0.00%
0
0
0
20,826,415
0
40,196,393
0.518
20,826,415
0
0
0.00%
0.00%
0.00%
0
0
0
15,577,337
13,923,135
30,089,884
0.518
15,577,337
13,061,828
14,674,506
89.38%
83.85%
94.20%
13,923,135
13,061,828
14,674,506
15,577,337
8,869,471
30,089,884
0.518
15,577,337
7,952,381
9,782,897
56.94%
51.05%
62.80%
8,869,471
7,952,381
9,782,897
15,577,337
2,249,894
30,089,884
0.518
15,577,337
1,777,573
2,947,704
14.44%
11.41%
18.92%
2,249,894
1,777,573
2,947,704
15,577,337
1,069,311
30,089,884
0.518
15,577,337
706,546
1,401,210
6.86%
4.54%
9.00%
1,069,311
706,546
1,401,210
15,577,337
274,544
30,089,884
0.518
15,577,337
50,942
565,119
1.76%
0.33%
3.63%
274,544
50,942
565,119
15,577,337
34,533
30,089,884
0.518
15,577,337
0
50,942
0.22%
0.00%
0.33%
34,533
0
50,942
15,577,337
8,395
30,089,884
0.518
15,577,337
0
50,942
0.05%
0.00%
0.33%
8,395
0
50,942
15,577,337
0
30,089,884
0.518
15,577,337
0
0
0.00%
0.00%
0.00%
0
0
0
15,577,337
0
30,089,884
0.518
15,577,337
0
0
0.00%
0.00%
0.00%
0
0
0
2,384,287
1,978,770
5,268,728
0.453
2,384,287
1,414,782
2,244,191
82.99%
59.34%
94.12%
1,978,770
1,414,782
2,244,191
2,384,287
961,209
5,268,728
0.453
2,384,287
607,571
1,450,841
40.31%
25.48%
60.85%
961,209
607,571
1,450,841
2,384,287
105,175
5,268,728
0.453
2,384,287
0
437,685
4.41%
0.00%
18.36%
105,175
0
437,685
2,384,287
11,295
5,268,728
0.453
2,384,287
0
50,425
0.47%
0.00%
2.11%
11,295
0
50,425
2,384,287
0
5,268,728
0.453
2,384,287
0
0
0.00%
0.00%
0.00%
0
0
0
2,384,287
0
5,268,728
0.453
2,384,287
0
0
0.00%
0.00%
0.00%
0
0
0
2,384,287
0
5,268,728
0.453
2,384,287
0
0
0.00%
0.00%
0.00%
0
0
0
2,384,287
0
5,268,728
0.453
2,384,287
0
0
0.00%
0.00%
0.00%
0
0
0
2,384,287
0
5,268,728
0.453
2,384,287
0
0
0.00%
0.00%
0.00%
0
0
0
2,864,791
2,374,379
4,837,781
0.592
2,864,791
2,171,452
2,566,396
82.88%
75.80%
89.58%
2,374,379
2,171,452
2,566,396
2,864,791
1,361,733
4,837,781
0.592
2,864,791
1,224,966
1,532,180
47.53%
42.76%
53.48%
1,361,733
1,224,966
1,532,180
2,864,791
404,398
4,837,781
0.592
2,864,791
282,735
561,225
14.12%
9.87%
19.59%
404,398
282,735
561,225
2,864,791
217,429
4,837,781
0.592
2,864,791
147,945
296,707
7.59%
5.16%
10.36%
217,429
147,945
296,707
2,864,791
89,835
4,837,781
0.592
2,864,791
36,986
147,945
3.14%
1.29%
5.16%
89,835
36,986
147,945
2,864,791
277
4,837,781
0.592
2,864,791
0
0
0.01%
0.00%
0.00%
277
0
0
2,864,791
0
4,837,781
0.592
2,864,791
0
0
0.00%
0.00%
0.00%
0
0
0
2,864,791
0
4,837,781
0.592
2,864,791
0
0
0.00%
0.00%
0.00%
0
0
0
2,864,791
0
4,837,781
0.592
2,864,791
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 46 of 114
December 2016

-------
E.3 - CAOnly



Number of



90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Percentage of
EPs with
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Total Number of
EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of EPs with
Mean Exceeding Threshold -
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR 2 EPs with
Predicted Mean
National #
Systems
EP Ratio
National Number
of EPs
Threshold
Predicted Mean
Exceeding
Threshold - National Extrapolation
National Extrapolation

UCMR 2 EPs
Exceeding
Threshold

Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
572
283
1,412
2.159
3,049
244
327
49.43%
42.66%
57.17%
1,861
1,531
2,394

2
572
131
1,412
2.159
3,049
110
153
22.85%
19.23%
26.75%
990
721
1,287

6
572
42
1,412
2.159
3,049
30
57
7.35%
5.24%
9.97%
429
254
619

10
572
25
1,412
2.159
3,049
17
34
4.35%
2.97%
5.94%
256
136
370
All EPs Only
20
572
10
1,412
2.159
3,049
3
16
1.76%
0.52%
2.80%
118
16
222

60
572
1
1,412
2.159
3,049
0
3
0.23%
0.00%
0.52%
11
0
16

100
572
0
1,412
2.159
3,049
0
1
0.05%
0.00%
0.24%
2
0
9

200
572
0
1,412
2.159
3,049
0
0
0.00%
0.00%
0.00%
0
0
0

600
572
0
1,412
2.159
3,049
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
201
117
392
1.388
545
104
131
58.22%
51.74%
65.17%
349
304
395

2
201
64
392
1.388
545
57
72
32.05%
28.36%
35.82%
223
195
246

6
201
26
392
1.388
545
20
33
12.88%
9.95%
16.42%
109
85
142
EPs Only at Surface
Water Systems
10
201
16
392
1.388
545
11
20
7.75%
5.47%
9.95%
72
50
90
20
201
7
392
1.388
545
3
11
3.69%
1.49%
5.47%
39
16
58
60
201
1
392
1.388
545
0
3
0.64%
0.00%
1.49%
8
0
16

100
201
0
392
1.388
545
0
1
0.14%
0.00%
0.67%
2
0
9

200
201
0
392
1.388
545
0
0
0.00%
0.00%
0.00%
0
0
0

600
201
0
392
1.388
545
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
103
24
665
1.437
955
14
36
22.83%
13.59%
34.95%
336
222
618

2
103
7
665
1.437
955
3
12
6.53%
2.91%
11.65%
86
17
213

6
103
1
665
1.437
955
0
3
0.74%
0.00%
2.91%
6
0
17
EPs Only at Ground
Water Systems
10
103
0
665
1.437
955
0
1
0.12%
0.00%
0.97%
1
0
8
20
103
0
665
1.437
955
0
0
0.00%
0.00%
0.00%
0
0
0
60
103
0
665
1.437
955
0
0
0.00%
0.00%
0.00%
0
0
0

100
103
0
665
1.437
955
0
0
0.00%
0.00%
0.00%
0
0
0

200
103
0
665
1.437
955
0
0
0.00%
0.00%
0.00%
0
0
0

600
103
0
665
1.437
955
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
268
142
355
4.360
1,550
126
160
53.07%
47.01%
59.70%
1,176
1,006
1,381

2
268
60
355
4.360
1,550
50
69
22.23%
18.66%
25.75%
681
509
828

6
268
15
355
4.360
1,550
10
21
5.75%
3.73%
7.84%
314
169
460
EPs Only at
10
268
9
355
4.360
1,550
6
13
3.43%
2.24%
4.85%
183
86
272
Mixed Water
20
268
3
355
4.360
1,550
0
5
0.99%
0.00%
1.87%
79
0
164
Systems
60
268
0
355
4.360
1,550
0
0
0.02%
0.00%
0.00%
3
0
0

100
268
0
355
4.360
1,550
0
0
0.00%
0.00%
0.00%
0
0
0

200
268
0
355
4.360
1,550
0
0
0.00%
0.00%
0.00%
0
0
0

600
268
0
355
4.360
1,550
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 47 of 114
December 2016

-------
E.3 - CAOnly
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served by
EPs with Mean
Exceeding Threshold
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
26,842,981
12,878,733
54,813,206
0.613
33,606,834
10,744,090
15,504,008
47.98%
40.03%
57.76%
16,953,670
13,902,936
20,579,152
26,842,981
5,517,608
54,813,206
0.613
33,606,834
4,587,596
6,512,472
20.56%
17.09%
24.26%
7,540,656
6,032,697
9,288,015
26,842,981
1,931,708
54,813,206
0.613
33,606,834
1,436,790
2,621,469
7.20%
5.35%
9.77%
2,740,048
1,822,109
3,731,332
26,842,981
1,120,476
54,813,206
0.613
33,606,834
752,992
1,508,929
4.17%
2.81%
5.62%
1,596,507
975,838
2,257,005
26,842,981
414,693
54,813,206
0.613
33,606,834
61,042
755,228
1.54%
0.23%
2.81%
589,991
96,140
1,031,876
26,842,981
31,335
54,813,206
0.613
33,606,834
0
61,042
0.12%
0.00%
0.23%
47,392
0
96,140
26,842,981
3,703
54,813,206
0.613
33,606,834
0
21,130
0.01%
0.00%
0.08%
7,371
0
37,165
26,842,981
6
54,813,206
0.613
33,606,834
0
0
0.00%
0.00%
0.00%
36
0
0
26,842,981
0
54,813,206
0.613
33,606,834
0
0
0.00%
0.00%
0.00%
0
0
0
18,165,392
9,241,275
36,529,231
0.564
20,617,471
7,890,304
10,708,432
50.87%
43.44%
58.95%
10,844,541
9,255,548
12,561,858
18,165,392
4,027,737
36,529,231
0.564
20,617,471
3,476,617
4,627,964
22.17%
19.14%
25.48%
4,985,874
4,245,243
5,767,694
18,165,392
1,494,856
36,529,231
0.564
20,617,471
1,142,633
1,900,999
8.23%
6.29%
10.46%
1,924,965
1,460,519
2,470,333
18,165,392
857,282
36,529,231
0.564
20,617,471
567,246
1,158,672
4.72%
3.12%
6.38%
1,137,241
765,323
1,514,355
18,165,392
350,832
36,529,231
0.564
20,617,471
61,042
642,052
1.93%
0.34%
3.53%
489,536
96,140
851,267
18,165,392
31,300
36,529,231
0.564
20,617,471
0
61,042
0.17%
0.00%
0.34%
46,290
0
96,140
18,165,392
3,703
36,529,231
0.564
20,617,471
0
21,130
0.02%
0.00%
0.12%
7,371
0
37,165
18,165,392
6
36,529,231
0.564
20,617,471
0
0
0.00%
0.00%
0.00%
36
0
0
18,165,392
0
36,529,231
0.564
20,617,471
0
0
0.00%
0.00%
0.00%
0
0
0
3,459,172
884,944
9,969,990
0.534
5,327,725
436,883
1,657,473
25.58%
12.63%
47.92%
1,588,169
892,389
2,688,934
3,459,172
248,644
9,969,990
0.534
5,327,725
66,021
420,355
7.19%
1.91%
12.15%
492,410
161,101
855,990
3,459,172
25,644
9,969,990
0.534
5,327,725
0
144,544
0.74%
0.00%
4.18%
56,282
0
239,625
3,459,172
3,456
9,969,990
0.534
5,327,725
0
16,261
0.10%
0.00%
0.47%
9,324
0
63,749
3,459,172
61
9,969,990
0.534
5,327,725
0
0
0.00%
0.00%
0.00%
238
0
0
3,459,172
0
9,969,990
0.534
5,327,725
0
0
0.00%
0.00%
0.00%
0
0
0
3,459,172
0
9,969,990
0.534
5,327,725
0
0
0.00%
0.00%
0.00%
0
0
0
3,459,172
0
9,969,990
0.534
5,327,725
0
0
0.00%
0.00%
0.00%
0
0
0
3,459,172
0
9,969,990
0.534
5,327,725
0
0
0.00%
0.00%
0.00%
0
0
0
5,218,417
2,752,515
8,313,985
0.922
7,661,638
2,416,903
3,138,103
52.75%
46.31%
60.14%
4,520,959
3,754,999
5,328,360
5,218,417
1,241,228
8,313,985
0.922
7,661,638
1,044,959
1,464,153
23.79%
20.02%
28.06%
2,062,372
1,626,353
2,664,332
5,218,417
411,208
8,313,985
0.922
7,661,638
294,156
575,926
7.88%
5.64%
11.04%
758,802
361,590
1,021,374
5,218,417
259,738
8,313,985
0.922
7,661,638
185,746
333,996
4.98%
3.56%
6.40%
449,942
210,515
678,901
5,218,417
63,800
8,313,985
0.922
7,661,638
0
113,176
1.22%
0.00%
2.17%
100,216
0
180,609
5,218,417
35
8,313,985
0.922
7,661,638
0
0
0.00%
0.00%
0.00%
1,102
0
0
5,218,417
0
8,313,985
0.922
7,661,638
0
0
0.00%
0.00%
0.00%
0
0
0
5,218,417
0
8,313,985
0.922
7,661,638
0
0
0.00%
0.00%
0.00%
0
0
0
5,218,417
0
8,313,985
0.922
7,661,638
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 48 of 114
December 2016

-------
E.3 - CAOnly



Number of



90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Percentage of
MRs with
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Total Number of
MRs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of MRs with
Mean Exceeding Threshold -
Source Water Type
Threshold (ng/L)
Total Number of
UCMR 2 MRs
UCMR 2 MRs with
Predicted Mean
National #
Systems
MR Ratio
National Number
of MRs
Threshold
Predicted Mean
Exceeding
Threshold - National Extrapolation
National Extrapolation


Exceeding
Threshold

Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
394
326
1,412
1.885
2,662
299
354
82.81%
75.89%
89.85%
2,105
1,746
2,555

2
394
206
1,412
1.885
2,662
183
230
52.34%
46.45%
58.38%
1,455
1,148
1,787

6
394
64
1,412
1.885
2,662
48
82
16.22%
12.18%
20.81%
640
404
888

10
394
33
1,412
1.885
2,662
22
44
8.49%
5.58%
11.17%
391
236
501
All MRs Only
20
394
13
1,412
1.885
2,662
7
21
3.29%
1.78%
5.33%
222
190
323

60
394
3
1,412
1.885
2,662

4
0.83%
0.25%
1.02%
149
81
171

100
394
1
1,412
1.885
2,662
0
4
0.34%
0.00%
1.02%
75
0
171

200
394
0
1,412
1.885
2,662
0
1
0.04%
0.00%
0.25%
12
0
81

600
394
0
1,412
1.885
2,662
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
185
169
392
1.283
503
161
177
91.44%
87.03%
95.68%
467
441
490

2
185
119
392
1.283
503
110
128
64.38%
59.46%
69.19%
347
315
372

6
185
42
392
1.283
503
35
51
22.96%
18.92%
27.57%
160
131
197
MRs Only at
10
185
23
392
1.283
503
16
28
12.45%
8.65%
15.14%
103
71
119
Surface Water
20
185
8
392
1.283
503
4
14
4.54%
2.16%
7.57%
49
28
77
Systems
60
185
2
392
1.283
503
0
2
0.82%
0.00%
1.08%
8
0
10

100
185
0
392
1.283
503
0
2
0.23%
0.00%
1.08%
3
0
10

200
185
0
392
1.283
503
0
0
0.00%
0.00%
0.00%
0
0
0

600
185
0
392
1.283
503
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
64
38
665
1.347
895
29
49
59.98%
45.31%
76.56%
582
417
818

2
64
16
665
1.347
895
10
24
25.70%
15.63%
37.50%
348
190
558

6
64
3
665
1.347
895
0
6
4.00%
0.00%
9.38%
68
0
186
MRs Only at
10
64
1
665
1.347
895
0
2
0.87%
0.00%
3.13%
11
0
9
Ground Water
20
64
0
665
1.347
895
0
0
0.03%
0.00%
0.00%
0
0
0
Systems
60
64
0
665
1.347
895
0
0
0.00%
0.00%
0.00%
0
0
0

100
64
0
665
1.347
895
0
0
0.00%
0.00%
0.00%
0
0
0

200
64
0
665
1.347
895
0
0
0.00%
0.00%
0.00%
0
0
0

600
64
0
665
1.347
895
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
145
119
355
3.555
1,264
109
128
81.89%
75.17%
88.28%
1,057
889
1,247

2
145
71
355
3.555
1,264
63
78
48.73%
43.45%
53.79%
761
643
858

6
145
19
355
3.555
1,264
13
25
13.00%
8.97%
17.24%
412
272
505
MRs Only at
10
145
10
355
3.555
1,264
6
14
6.81%
4.14%
9.66%
278
165
373
Mixed Water
20
145
5
355
3.555
1,264
3
7
3.15%
2.07%
4.83%
173
162
246
Systems
60
145
2
355
3.555
1,264

2
1.21%
0.69%
1.38%
141
81
161

100
145
1
355
3.555
1,264
0
2
0.62%
0.00%
1.38%
72
0
161

200
145
0
355
3.555
1,264
0
1
0.11%
0.00%
0.69%
12
0
81

600
145
0
355
3.555
1,264
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 49 of 114
December 2016

-------
E.3 - CAOnly
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
22,284,165
19,427,338
54,813,206
0.507
27,799,231
17,645,740
20,783,567
87.18%
79.19%
93.27%
23,897,223
21,481,497
25,835,427
22,284,165
11,894,630
54,813,206
0.507
27,799,231
10,360,844
13,606,181
53.38%
46.49%
61.06%
14,846,208
12,793,746
17,142,149
22,284,165
3,066,816
54,813,206
0.507
27,799,231
2,248,357
4,378,896
13.76%
10.09%
19.65%
4,428,169
3,080,278
6,367,694
22,284,165
1,445,707
54,813,206
0.507
27,799,231
927,735
1,985,571
6.49%
4.16%
8.91%
2,109,862
1,206,254
3,071,498
22,284,165
404,372
54,813,206
0.507
27,799,231
96,323
787,170
1.81%
0.43%
3.53%
591,124
178,742
1,091,101
22,284,165
39,094
54,813,206
0.507
27,799,231
814
55,870
0.18%
0.00%
0.25%
95,874
25,584
121,445
22,284,165
9,987
54,813,206
0.507
27,799,231
0
55,870
0.04%
0.00%
0.25%
36,433
0
121,445
22,284,165
150
54,813,206
0.507
27,799,231
0
814
0.00%
0.00%
0.00%
4,073
0
25,584
22,284,165
0
54,813,206
0.507
27,799,231
0
0
0.00%
0.00%
0.00%
0
0
0
16,389,136
14,669,711
36,529,231
0.513
18,722,421
13,758,328
15,469,921
89.51%
83.95%
94.39%
16,819,260
15,766,057
17,757,280
16,389,136
9,359,613
36,529,231
0.513
18,722,421
8,372,116
10,350,075
57.11%
51.08%
63.15%
10,787,667
9,594,499
11,995,310
16,389,136
2,475,759
36,529,231
0.513
18,722,421
1,935,590
3,235,841
15.11%
11.81%
19.74%
3,143,073
2,409,244
4,084,197
16,389,136
1,186,894
36,529,231
0.513
18,722,421
778,161
1,564,446
7.24%
4.75%
9.55%
1,546,615
1,007,141
2,053,010
16,389,136
311,689
36,529,231
0.513
18,722,421
57,708
636,767
1.90%
0.35%
3.89%
436,983
90,589
865,910
16,389,136
37,396
36,529,231
0.513
18,722,421
0
54,242
0.23%
0.00%
0.33%
50,945
0
70,277
16,389,136
9,255
36,529,231
0.513
18,722,421
0
54,242
0.06%
0.00%
0.33%
13,436
0
70,277
16,389,136
25
36,529,231
0.513
18,722,421
0
0
0.00%
0.00%
0.00%
145
0
0
16,389,136
0
36,529,231
0.513
18,722,421
0
0
0.00%
0.00%
0.00%
0
0
0
2,912,958
2,269,796
9,969,990
0.465
4,639,800
1,611,003
2,629,970
77.92%
55.30%
90.29%
3,245,152
2,272,528
3,939,532
2,912,958
1,073,321
9,969,990
0.465
4,639,800
671,083
1,615,424
36.85%
23.04%
55.46%
1,481,521
874,472
2,231,794
2,912,958
134,557
9,969,990
0.465
4,639,800
0
502,652
4.62%
0.00%
17.26%
235,937
0
762,959
2,912,958
18,960
9,969,990
0.465
4,639,800
0
80,882
0.65%
0.00%
2.78%
43,234
0
169,826
2,912,958
336
9,969,990
0.465
4,639,800
0
0
0.01%
0.00%
0.00%
1,317
0
0
2,912,958
0
9,969,990
0.465
4,639,800
0
0
0.00%
0.00%
0.00%
0
0
0
2,912,958
0
9,969,990
0.465
4,639,800
0
0
0.00%
0.00%
0.00%
0
0
0
2,912,958
0
9,969,990
0.465
4,639,800
0
0
0.00%
0.00%
0.00%
0
0
0
2,912,958
0
9,969,990
0.465
4,639,800
0
0
0.00%
0.00%
0.00%
0
0
0
2,982,071
2,487,831
8,313,985
0.534
4,437,010
2,276,409
2,683,675
83.43%
76.34%
89.99%
3,832,810
3,442,912
4,138,615
2,982,071
1,461,697
8,313,985
0.534
4,437,010
1,317,645
1,640,682
49.02%
44.19%
55.02%
2,577,020
2,324,775
2,915,045
2,982,071
456,501
8,313,985
0.534
4,437,010
312,766
640,403
15.31%
10.49%
21.48%
1,049,160
671,034
1,520,538
2,982,071
239,853
8,313,985
0.534
4,437,010
149,574
340,243
8.04%
5.02%
11.41%
520,013
199,113
848,662
2,982,071
92,348
8,313,985
0.534
4,437,010
38,615
150,404
3.10%
1.29%
5.04%
152,824
88,154
225,191
2,982,071
1,698
8,313,985
0.534
4,437,010
814
1,629
0.06%
0.03%
0.05%
44,929
25,584
51,168
2,982,071
732
8,313,985
0.534
4,437,010
0
1,629
0.02%
0.00%
0.05%
22,997
0
51,168
2,982,071
125
8,313,985
0.534
4,437,010
0
814
0.00%
0.00%
0.03%
3,929
0
25,584
2,982,071
0
8,313,985
0.534
4,437,010
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 50 of 114
December 2016

-------
E.4 - CA with CL-OT
Source Water Type
Threshold
Total
Number of
UCMR 2 EPs with
National #
EP Ratio
National Number
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 EPs
Exceeding
Systems
of EPs




Threshold -
National
Extrapolation





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)

0.6
27
20
1,252
1.256
1,573
16
24
73.31%
59.26%
88.89%
759
501
1,091

2
27
14
1,252
1.256
1,573
11
17
53.22%
40.74%
64.26%
497
385
638

6
27
8
1,252
1.256
1,573
5
10
28.73%
18.52%
37.04%
287
188
376

10
27
5
1,252
1.256
1,573
3
7
18.57%
11.11%
25.93%
180
99
278
All EPs Only
20
27
2
1,252
1.256
1,573

4
6.77%
3.70%
14.81%
37
9
107

60
27
0
1,252
1.256
1,573
0
1
0.37%
0.00%
3.70%
1
0
9

100
27
0
1,252
1.256
1,573
0
0
0.02%
0.00%
0.00%
0
0
0

200
27
0
1,252
1.256
1,573
0
0
0.00%
0.00%
0.00%
0
0
0

600
27
0
1,252
1.256
1,573
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
14
12
125
1.000
125
11
14
88.92%
78.57%
100.00%
111
98
125

2
14
9
125
1.000
125
7
11
66.31%
50.00%
78.57%
83
63
98

6
14
5
125
1.000
125
3
6
33.73%
21.43%
42.86%
42
27
54
EPs Only at Surface
Water Systems
10
14
3
125
1.000
125
2
4
22.39%
14.29%
28.57%
28
18
36
20
14
2
125
1.000
125

3
11.01%
7.14%
21.43%
14
9
27
60
14
0
125
1.000
125
0
1
0.71%
0.00%
7.14%
1
0
9

100
14
0
125
1.000
125
0
0
0.04%
0.00%
0.00%
0
0
0

200
14
0
125
1.000
125
0
0
0.00%
0.00%
0.00%
0
0
0

600
14
0
125
1.000
125
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
5
1
482
1.667
803
0
2
13.90%
0.00%
40.00%
112
0
321

2
5
0
482
1.667
803
0
0
1.01%
0.00%
7.00%
8
0
56

6
5
0
482
1.667
803
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
10
5
0
482
1.667
803
0
0
0.00%
0.00%
0.00%
0
0
0
20
5
0
482
1.667
803
0
0
0.00%
0.00%
0.00%
0
0
0
60
5
0
482
1.667
803
0
0
0.00%
0.00%
0.00%
0
0
0

100
5
0
482
1.667
803
0
0
0.00%
0.00%
0.00%
0
0
0

200
5
0
482
1.667
803
0
0
0.00%
0.00%
0.00%
0
0
0

600
5
0
482
1.667
803
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
8
7
645
1.000
645
5
8
83.12%
62.50%
100.00%
536
403
645

2
8
5
645
1.000
645
4
6
62.94%
50.00%
75.00%
406
322
484

6
8
3
645
1.000
645
2
4
37.94%
25.00%
50.00%
245
161
322
EPs Only at
10
8
2
645
1.000
645

3
23.50%
12.50%
37.50%
152
81
242
Mixed Water
20
8
0
645
1.000
645
0
1
3.58%
0.00%
12.50%
23
0
81
Systems
60
8
0
645
1.000
645
0
0
0.00%
0.00%
0.00%
0
0
0

100
8
0
645
1.000
645
0
0
0.00%
0.00%
0.00%
0
0
0

200
8
0
645
1.000
645
0
0
0.00%
0.00%
0.00%
0
0
0

600
8
0
645
1.000
645
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 51 of 114
December 2016

-------
E.4 - CA with CL-OT
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population Served
by EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
42,674
34,217
2,356,537
0.290
683,695
27,865
40,168
80.18%
65.30%
94.13%
421,070
303,939
567,433
42,674
25,406
2,356,537
0.290
683,695
19,738
30,742
59.54%
46.25%
72.04%
298,360
233,499
372,291
42,674
10,877
2,356,537
0.290
683,695
5,581
16,203
25.49%
13.08%
37.97%
158,365
62,796
216,263
42,674
5,869
2,356,537
0.290
683,695
3,181
10,622
13.75%
7.45%
24.89%
80,749
27,650
165,607
42,674
2,182
2,356,537
0.290
683,695
1,086
3,858
5.11%
2.54%
9.04%
15,204
5,294
42,254
42,674
109
2,356,537
0.290
683,695
0
1,086
0.26%
0.00%
2.54%
532
0
5,294
42,674
6
2,356,537
0.290
683,695
0
0
0.01%
0.00%
0.00%
30
0
0
42,674
0
2,356,537
0.290
683,695
0
0
0.00%
0.00%
0.00%
0
0
0
42,674
0
2,356,537
0.290
683,695
0
0
0.00%
0.00%
0.00%
0
0
0
30,491
27,465
317,258
0.469
148,647
23,338
30,491
90.07%
76.54%
100.00%
133,892
113,776
148,647
30,491
20,715
317,258
0.469
148,647
16,041
24,758
67.94%
52.61%
81.20%
100,988
78,201
120,696
30,491
8,040
317,258
0.469
148,647
4,622
12,506
26.37%
15.16%
41.01%
39,194
22,533
60,965
30,491
4,465
317,258
0.469
148,647
2,854
7,556
14.64%
9.36%
24.78%
21,768
13,913
36,836
30,491
2,059
317,258
0.469
148,647
1,086
3,226
6.75%
3.56%
10.58%
10,038
5,294
15,727
30,491
109
317,258
0.469
148,647
0
1,086
0.36%
0.00%
3.56%
532
0
5,294
30,491
6
317,258
0.469
148,647
0
0
0.02%
0.00%
0.00%
30
0
0
30,491
0
317,258
0.469
148,647
0
0
0.00%
0.00%
0.00%
0
0
0
30,491
0
317,258
0.469
148,647
0
0
0.00%
0.00%
0.00%
0
0
0
5,303
805
405,603
0.607
246,072
0
2,798
15.19%
0.00%
52.75%
37,373
0
129,811
5,303
71
405,603
0.607
246,072
0
54
1.35%
0.00%
1.02%
3,317
0
2,517
5,303
0
405,603
0.607
246,072
0
0
0.00%
0.00%
0.00%
0
0
0
5,303
0
405,603
0.607
246,072
0
0
0.00%
0.00%
0.00%
0
0
0
5,303
0
405,603
0.607
246,072
0
0
0.00%
0.00%
0.00%
0
0
0
5,303
0
405,603
0.607
246,072
0
0
0.00%
0.00%
0.00%
0
0
0
5,303
0
405,603
0.607
246,072
0
0
0.00%
0.00%
0.00%
0
0
0
5,303
0
405,603
0.607
246,072
0
0
0.00%
0.00%
0.00%
0
0
0
5,303
0
405,603
0.607
246,072
0
0
0.00%
0.00%
0.00%
0
0
0
6,879
5,947
1,633,675
0.177
288,975
4,527
6,879
86.45%
65.81%
100.00%
249,805
190,163
288,975
6,879
4,620
1,633,675
0.177
288,975
3,697
5,930
67.15%
53.74%
86.19%
194,056
155,298
249,078
6,879
2,837
1,633,675
0.177
288,975
959
3,697
41.24%
13.93%
53.74%
119,170
40,263
155,298
6,879
1,404
1,633,675
0.177
288,975
327
3,066
20.41%
4.75%
44.56%
58,981
13,736
128,771
6,879
123
1,633,675
0.177
288,975
0
632
1.79%
0.00%
9.18%
5,166
0
26,527
6,879
0
1,633,675
0.177
288,975
0
0
0.00%
0.00%
0.00%
0
0
0
6,879
0
1,633,675
0.177
288,975
0
0
0.00%
0.00%
0.00%
0
0
0
6,879
0
1,633,675
0.177
288,975
0
0
0.00%
0.00%
0.00%
0
0
0
6,879
0
1,633,675
0.177
288,975
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 52 of 114
December 2016

-------
E.4 - CA with CL-OT
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
National #
MR Ratio
National Number
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
Threshold -
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Exceeding
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)

0.6
25
21
1,252
1.000
1,252
18
24
85.05%
72.00%
96.00%
865
591
1,091

2
25
16
1,252
1.000
1,252
14
19
63.51%
56.00%
76.00%
547
484
752

6
25
9
1,252
1.000
1,252
7
12
37.75%
28.00%
48.00%
314
206
394

10
25
6
1,252
1.000
1,252
3
9
22.51%
12.00%
36.00%
153
27
296
All MRs Only
20
25
3
1,252
1.000
1,252
2
4
11.11%
8.00%
16.00%
31
18
107

60
25
0
1,252
1.000
1,252
0
1
0.94%
0.00%
4.00%
2
0
9

100
25
0
1,252
1.000
1,252
0
0
0.08%
0.00%
0.00%
0
0
0

200
25
0
1,252
1.000
1,252
0
0
0.00%
0.00%
0.00%
0
0
0

600
25
0
1,252
1.000
1,252
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
14
13
125
1.000
125
12
14
93.65%
85.71%
100.00%
117
107
125

2
14
10
125
1.000
125
9
12
73.88%
64.29%
85.71%
93
81
107

6
14
6
125
1.000
125
5
8
44.58%
35.71%
57.14%
56
45
72
MRs Only at
10
14
4
125
1.000
125
3
6
29.95%
21.43%
42.86%
38
27
54
Surface Water
20
14
3
125
1.000
125
2
3
19.26%
14.29%
21.43%
24
18
27
Systems
60
14
0
125
1.000
125
0
1
1.69%
0.00%
7.14%
2
0
9

100
14
0
125
1.000
125
0
0
0.15%
0.00%
0.00%
0
0
0

200
14
0
125
1.000
125
0
0
0.00%
0.00%
0.00%
0
0
0

600
14
0
125
1.000
125
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
3
1
482
1.000
482
0
2
37.83%
0.00%
66.67%
182
0
321

2
3
0
482
1.000
482
0
1
3.68%
0.00%
33.33%
18
0
161

6
3
0
482
1.000
482
0
0
0.06%
0.00%
0.00%
0
0
0
MRs Only at
10
3
0
482
1.000
482
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
3
0
482
1.000
482
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
3
0
482
1.000
482
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
0
482
1.000
482
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
0
482
1.000
482
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
0
482
1.000
482
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
8
7
645
1.000
645
6
8
87.71%
75.00%
100.00%
566
484
645

2
8
5
645
1.000
645
5
6
67.79%
62.50%
75.00%
437
403
484

6
8
3
645
1.000
645
2
4
39.91%
25.00%
50.00%
257
161
322
MRs Only at
10
8
1
645
1.000
645
0
3
17.93%
0.00%
37.50%
116
0
242
Mixed Water
20
8
0
645
1.000
645
0
1
1.01%
0.00%
12.50%
6
0
81
Systems
60
8
0
645
1.000
645
0
0
0.00%
0.00%
0.00%
0
0
0

100
8
0
645
1.000
645
0
0
0.00%
0.00%
0.00%
0
0
0

200
8
0
645
1.000
645
0
0
0.00%
0.00%
0.00%
0
0
0

600
8
0
645
1.000
645
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 53 of 114
December 2016

-------
E.4 - CA with CL-OT
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population Served
by MRs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
40,809
34,954
2,356,537
0.253
597,154
28,860
40,654
85.65%
70.72%
99.62%
437,022
296,553
589,962
40,809
26,349
2,356,537
0.253
597,154
23,091
30,603
64.57%
56.58%
74.99%
283,347
237,609
365,118
40,809
15,907
2,356,537
0.253
597,154
10,379
21,423
38.98%
25.43%
52.50%
153,157
86,188
222,927
40,809
9,022
2,356,537
0.253
597,154
4,622
15,727
22.11%
11.33%
38.54%
73,731
22,533
140,890
40,809
4,257
2,356,537
0.253
597,154
2,854
5,056
10.43%
6.99%
12.39%
22,301
13,913
40,746
40,809
281
2,356,537
0.253
597,154
0
1,086
0.69%
0.00%
2.66%
1,368
0
5,294
40,809
22
2,356,537
0.253
597,154
0
0
0.05%
0.00%
0.00%
109
0
0
40,809
0
2,356,537
0.253
597,154
0
0
0.00%
0.00%
0.00%
0
0
0
40,809
0
2,356,537
0.253
597,154
0
0
0.00%
0.00%
0.00%
0
0
0
30,491
27,933
317,258
0.469
148,647
24,662
30,491
91.61%
80.88%
100.00%
136,175
120,231
148,647
30,491
22,193
317,258
0.469
148,647
19,723
24,898
72.79%
64.68%
81.66%
108,194
96,153
121,381
30,491
13,871
317,258
0.469
148,647
9,420
18,232
45.49%
30.89%
59.80%
67,624
45,925
88,884
30,491
8,221
317,258
0.469
148,647
4,622
13,998
26.96%
15.16%
45.91%
40,078
22,533
68,240
30,491
4,215
317,258
0.469
148,647
2,854
4,622
13.82%
9.36%
15.16%
20,548
13,913
22,533
30,491
281
317,258
0.469
148,647
0
1,086
0.92%
0.00%
3.56%
1,368
0
5,294
30,491
22
317,258
0.469
148,647
0
0
0.07%
0.00%
0.00%
109
0
0
30,491
0
317,258
0.469
148,647
0
0
0.00%
0.00%
0.00%
0
0
0
30,491
0
317,258
0.469
148,647
0
0
0.00%
0.00%
0.00%
0
0
0
3,438
1,344
405,603
0.393
159,531
0
3,283
39.10%
0.00%
95.49%
62,378
0
152,339
3,438
138
405,603
0.393
159,531
0
933
4.01%
0.00%
27.12%
6,399
0
43,270
3,438
2
405,603
0.393
159,531
0
0
0.05%
0.00%
0.00%
81
0
0
3,438
0
405,603
0.393
159,531
0
0
0.00%
0.00%
0.00%
0
0
0
3,438
0
405,603
0.393
159,531
0
0
0.00%
0.00%
0.00%
0
0
0
3,438
0
405,603
0.393
159,531
0
0
0.00%
0.00%
0.00%
0
0
0
3,438
0
405,603
0.393
159,531
0
0
0.00%
0.00%
0.00%
0
0
0
3,438
0
405,603
0.393
159,531
0
0
0.00%
0.00%
0.00%
0
0
0
3,438
0
405,603
0.393
159,531
0
0
0.00%
0.00%
0.00%
0
0
0
6,879
5,677
1,633,675
0.177
288,975
4,198
6,879
82.52%
61.02%
100.00%
238,469
176,322
288,975
6,879
4,017
1,633,675
0.177
288,975
3,368
4,772
58.40%
48.95%
69.37%
168,754
141,457
200,468
6,879
2,034
1,633,675
0.177
288,975
959
3,191
29.57%
13.93%
46.39%
85,452
40,263
134,043
6,879
801
1,633,675
0.177
288,975
0
1,730
11.65%
0.00%
25.14%
33,653
0
72,650
6,879
42
1,633,675
0.177
288,975
0
434
0.61%
0.00%
6.30%
1,753
0
18,213
6,879
0
1,633,675
0.177
288,975
0
0
0.00%
0.00%
0.00%
0
0
0
6,879
0
1,633,675
0.177
288,975
0
0
0.00%
0.00%
0.00%
0
0
0
6,879
0
1,633,675
0.177
288,975
0
0
0.00%
0.00%
0.00%
0
0
0
6,879
0
1,633,675
0.177
288,975
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 54 of 114
December 2016

-------
E.4 - CA with CL-OT
Source Water Type
Threshold
Total
Number of
UCMR 2 EPs with
National #
EP Ratio
National Number
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 EPs
Exceeding
Systems
of EPs




Threshold -
National
Extrapolation





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)

0.6
12
4
149
1.432
213

8
32.40%
8.33%
66.67%
73
21
127

2
12
1
149
1.432
213

2
10.00%
8.33%
16.67%
25
21
43

6
12
0
149
1.432
213
0
1
0.84%
0.00%
8.33%
2
0
21

10
12
0
149
1.432
213
0
0
0.05%
0.00%
0.00%
0
0
0
All EPs Only
20
12
0
149
1.432
213
0
0
0.00%
0.00%
0.00%
0
0
0

60
12
0
149
1.432
213
0
0
0.00%
0.00%
0.00%
0
0
0

100
12
0
149
1.432
213
0
0
0.00%
0.00%
0.00%
0
0
0

200
12
0
149
1.432
213
0
0
0.00%
0.00%
0.00%
0
0
0

600
12
0
149
1.432
213
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
2
1
12
1.000
12
0
2
25.75%
0.00%
100.00%
3
0
12

2
2
0
12
1.000
12
0
0
0.94%
0.00%
0.00%
0
0
0

6
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
10
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0
20
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0
60
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

100
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

200
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

600
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
0
8
1.000
8
0
1
17.79%
0.00%
100.00%
1
0
8

2
1
0
8
1.000
8
0
0
1.31%
0.00%
0.00%
0
0
0

6
1
0
8
1.000
8
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
10
1
0
8
1.000
8
0
0
0.00%
0.00%
0.00%
0
0
0
20
1
0
8
1.000
8
0
0
0.00%
0.00%
0.00%
0
0
0
60
1
0
8
1.000
8
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
0
8
1.000
8
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
0
8
1.000
8
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
0
8
1.000
8
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
9
3
128
1.500
193

5
35.50%
11.11%
55.56%
68
21
107

2
9
1
128
1.500
193

2
12.98%
11.11%
22.22%
25
21
43

6
9
0
128
1.500
193
0
1
1.12%
0.00%
11.11%
2
0
21
EPs Only at
10
9
0
128
1.500
193
0
0
0.06%
0.00%
0.00%
0
0
0
Mixed Water
20
9
0
128
1.500
193
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
9
0
128
1.500
193
0
0
0.00%
0.00%
0.00%
0
0
0

100
9
0
128
1.500
193
0
0
0.00%
0.00%
0.00%
0
0
0

200
9
0
128
1.500
193
0
0
0.00%
0.00%
0.00%
0
0
0

600
9
0
128
1.500
193
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 55 of 114
December 2016

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E.4 - CA with CL-OT
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population Served
by EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
108,220
37,338
4,908,058
0.259
1,271,264
11,056
88,786
34.50%
10.22%
82.04%
515,860
191,157
935,238
108,220
12,573
4,908,058
0.259
1,271,264
11,056
22,112
11.62%
10.22%
20.43%
209,865
191,157
382,313
108,220
1,118
4,908,058
0.259
1,271,264
0
11,056
1.03%
0.00%
10.22%
19,330
0
191,157
108,220
62
4,908,058
0.259
1,271,264
0
0
0.06%
0.00%
0.00%
1,074
0
0
108,220
0
4,908,058
0.259
1,271,264
0
0
0.00%
0.00%
0.00%
0
0
0
108,220
0
4,908,058
0.259
1,271,264
0
0
0.00%
0.00%
0.00%
0
0
0
108,220
0
4,908,058
0.259
1,271,264
0
0
0.00%
0.00%
0.00%
0
0
0
108,220
0
4,908,058
0.259
1,271,264
0
0
0.00%
0.00%
0.00%
0
0
0
108,220
0
4,908,058
0.259
1,271,264
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
5,965
408,139
0.319
130,258
0
22,220
26.84%
0.00%
100.00%
34,967
0
130,258
22,220
262
408,139
0.319
130,258
0
0
1.18%
0.00%
0.00%
1,537
0
0
22,220
0
408,139
0.319
130,258
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
0
408,139
0.319
130,258
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
0
408,139
0.319
130,258
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
0
408,139
0.319
130,258
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
0
408,139
0.319
130,258
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
0
408,139
0.319
130,258
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
0
408,139
0.319
130,258
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
4,612
204,555
0.500
102,278
0
25,924
17.79%
0.00%
100.00%
18,195
0
102,278
25,924
340
204,555
0.500
102,278
0
0
1.31%
0.00%
0.00%
1,341
0
0
25,924
0
204,555
0.500
102,278
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
0
204,555
0.500
102,278
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
0
204,555
0.500
102,278
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
0
204,555
0.500
102,278
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
0
204,555
0.500
102,278
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
0
204,555
0.500
102,278
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
0
204,555
0.500
102,278
0
0
0.00%
0.00%
0.00%
0
0
0
60,076
26,761
4,295,363
0.242
1,038,728
11,056
40,642
44.54%
18.40%
67.65%
462,698
191,157
702,703
60,076
11,971
4,295,363
0.242
1,038,728
11,056
22,112
19.93%
18.40%
36.81%
206,987
191,157
382,313
60,076
1,118
4,295,363
0.242
1,038,728
0
11,056
1.86%
0.00%
18.40%
19,330
0
191,157
60,076
62
4,295,363
0.242
1,038,728
0
0
0.10%
0.00%
0.00%
1,074
0
0
60,076
0
4,295,363
0.242
1,038,728
0
0
0.00%
0.00%
0.00%
0
0
0
60,076
0
4,295,363
0.242
1,038,728
0
0
0.00%
0.00%
0.00%
0
0
0
60,076
0
4,295,363
0.242
1,038,728
0
0
0.00%
0.00%
0.00%
0
0
0
60,076
0
4,295,363
0.242
1,038,728
0
0
0.00%
0.00%
0.00%
0
0
0
60,076
0
4,295,363
0.242
1,038,728
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 56 of 114
December 2016

-------
E.4 - CA with CL-OT
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
National #
MR Ratio
National Number
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
Threshold -
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Exceeding
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)

0.6
12
9
149
1.432
213
6
12
75.56%
50.00%
100.00%
166
113
213

2
12
3
149
1.432
213

5
23.97%
8.33%
41.67%
56
21
92

6
12
0
149
1.432
213
0
1
1.72%
0.00%
8.33%
4
0
21

10
12
0
149
1.432
213
0
0
0.08%
0.00%
0.00%
0
0
0
All MRs Only
20
12
0
149
1.432
213
0
0
0.00%
0.00%
0.00%
0
0
0

60
12
0
149
1.432
213
0
0
0.00%
0.00%
0.00%
0
0
0

100
12
0
149
1.432
213
0
0
0.00%
0.00%
0.00%
0
0
0

200
12
0
149
1.432
213
0
0
0.00%
0.00%
0.00%
0
0
0

600
12
0
149
1.432
213
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
2
2
12
1.000
12

2
75.94%
50.00%
100.00%
9
6
12

2
2
0
12
1.000
12
0
1
15.45%
0.00%
50.00%
2
0
6

6
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
20
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

100
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

200
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

600
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
0
8
1.000
8
0
1
39.14%
0.00%
100.00%
3
0
8

2
1
0
8
1.000
8
0
0
3.37%
0.00%
0.00%
0
0
0

6
1
0
8
1.000
8
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
1
0
8
1.000
8
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
1
0
8
1.000
8
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
1
0
8
1.000
8
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
0
8
1.000
8
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
0
8
1.000
8
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
0
8
1.000
8
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
9
7
128
1.500
193
5
9
79.53%
55.56%
100.00%
153
107
193

2
9
3
128
1.500
193

4
28.15%
11.11%
44.44%
54
21
86

6
9
0
128
1.500
193
0
1
2.29%
0.00%
11.11%
4
0
21
MRs Only at
10
9
0
128
1.500
193
0
0
0.10%
0.00%
0.00%
0
0
0
Mixed Water
20
9
0
128
1.500
193
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
9
0
128
1.500
193
0
0
0.00%
0.00%
0.00%
0
0
0

100
9
0
128
1.500
193
0
0
0.00%
0.00%
0.00%
0
0
0

200
9
0
128
1.500
193
0
0
0.00%
0.00%
0.00%
0
0
0

600
9
0
128
1.500
193
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 57 of 114
December 2016

-------
E.4 - CA with CL-OT
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population Served
by MRs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
103,040
70,116
4,908,058
0.241
1,181,687
40,084
103,040
68.05%
38.90%
100.00%
907,677
621,111
1,181,687
103,040
23,051
4,908,058
0.241
1,181,687
11,056
35,882
22.37%
10.73%
34.82%
361,981
191,157
548,452
103,040
2,263
4,908,058
0.241
1,181,687
0
11,056
2.20%
0.00%
10.73%
39,125
0
191,157
103,040
104
4,908,058
0.241
1,181,687
0
0
0.10%
0.00%
0.00%
1,790
0
0
103,040
0
4,908,058
0.241
1,181,687
0
0
0.00%
0.00%
0.00%
0
0
0
103,040
0
4,908,058
0.241
1,181,687
0
0
0.00%
0.00%
0.00%
0
0
0
103,040
0
4,908,058
0.241
1,181,687
0
0
0.00%
0.00%
0.00%
0
0
0
103,040
0
4,908,058
0.241
1,181,687
0
0
0.00%
0.00%
0.00%
0
0
0
103,040
0
4,908,058
0.241
1,181,687
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
14,809
408,139
0.319
130,258
6,296
22,220
66.64%
28.33%
100.00%
86,810
36,906
130,258
22,220
2,180
408,139
0.319
130,258
0
6,296
9.81%
0.00%
28.33%
12,778
0
36,906
22,220
0
408,139
0.319
130,258
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
0
408,139
0.319
130,258
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
0
408,139
0.319
130,258
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
0
408,139
0.319
130,258
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
0
408,139
0.319
130,258
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
0
408,139
0.319
130,258
0
0
0.00%
0.00%
0.00%
0
0
0
22,220
0
408,139
0.319
130,258
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
10,146
204,555
0.500
102,278
0
25,924
39.14%
0.00%
100.00%
40,030
0
102,278
25,924
874
204,555
0.500
102,278
0
0
3.37%
0.00%
0.00%
3,448
0
0
25,924
0
204,555
0.500
102,278
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
0
204,555
0.500
102,278
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
0
204,555
0.500
102,278
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
0
204,555
0.500
102,278
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
0
204,555
0.500
102,278
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
0
204,555
0.500
102,278
0
0
0.00%
0.00%
0.00%
0
0
0
25,924
0
204,555
0.500
102,278
0
0
0.00%
0.00%
0.00%
0
0
0
54,895
45,161
4,295,363
0.221
949,152
33,788
54,895
82.27%
61.55%
100.00%
780,838
584,205
949,152
54,895
19,997
4,295,363
0.221
949,152
11,056
29,586
36.43%
20.14%
53.90%
345,756
191,157
511,546
54,895
2,263
4,295,363
0.221
949,152
0
11,056
4.12%
0.00%
20.14%
39,125
0
191,157
54,895
104
4,295,363
0.221
949,152
0
0
0.19%
0.00%
0.00%
1,790
0
0
54,895
0
4,295,363
0.221
949,152
0
0
0.00%
0.00%
0.00%
0
0
0
54,895
0
4,295,363
0.221
949,152
0
0
0.00%
0.00%
0.00%
0
0
0
54,895
0
4,295,363
0.221
949,152
0
0
0.00%
0.00%
0.00%
0
0
0
54,895
0
4,295,363
0.221
949,152
0
0
0.00%
0.00%
0.00%
0
0
0
54,895
0
4,295,363
0.221
949,152
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 58 of 114
December 2016

-------
E.4 - CA with CL-OT
Source Water Type
Threshold
Total
Number of
UCMR 2 EPs with
National #
EP Ratio
National Number
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 EPs
Exceeding
Systems
of EPs




Threshold -
National
Extrapolation





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
56
24
45
1.244
56
17
33
42.23%
30.36%
58.93%
24
17
33

2
56
9
45
1.244
56
6
14
15.68%
10.71%
25.00%
9
6
14

6
56
1
45
1.244
56
0
3
2.26%
0.00%
5.36%
1
0
3

10
56
0
45
1.244
56
0
1
0.85%
0.00%
1.79%
0
0
1
All EPs Only
20
56
0
45
1.244
56
0
0
0.05%
0.00%
0.00%
0
0
0

60
56
0
45
1.244
56
0
0
0.00%
0.00%
0.00%
0
0
0

100
56
0
45
1.244
56
0
0
0.00%
0.00%
0.00%
0
0
0

200
56
0
45
1.244
56
0
0
0.00%
0.00%
0.00%
0
0
0

600
56
0
45
1.244
56
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
25
9
17
1.471
25
6
12
34.29%
24.00%
48.00%
9
6
12

2
25
3
17
1.471
25
2
5
13.13%
8.00%
20.00%
3
2
5

6
25
1
17
1.471
25
0
2
3.89%
0.00%
8.00%
1
0
2
EPs Only at Surface
Water Systems
10
25
0
17
1.471
25
0
1
1.89%
0.00%
4.00%
0
0
1
20
25
0
17
1.471
25
0
0
0.10%
0.00%
0.00%
0
0
0
60
25
0
17
1.471
25
0
0
0.00%
0.00%
0.00%
0
0
0

100
25
0
17
1.471
25
0
0
0.00%
0.00%
0.00%
0
0
0

200
25
0
17
1.471
25
0
0
0.00%
0.00%
0.00%
0
0
0

600
25
0
17
1.471
25
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
8
1
4
2.000
8
0
3
11.40%
0.00%
37.50%
1
0
3

2
8
0
4
2.000
8
0
1
0.94%
0.00%
12.50%
0
0
1

6
8
0
4
2.000
8
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
10
8
0
4
2.000
8
0
0
0.00%
0.00%
0.00%
0
0
0
20
8
0
4
2.000
8
0
0
0.00%
0.00%
0.00%
0
0
0
60
8
0
4
2.000
8
0
0
0.00%
0.00%
0.00%
0
0
0

100
8
0
4
2.000
8
0
0
0.00%
0.00%
0.00%
0
0
0

200
8
0
4
2.000
8
0
0
0.00%
0.00%
0.00%
0
0
0

600
8
0
4
2.000
8
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
23
14
24
0.958
23
11
18
61.59%
47.83%
78.26%
14
11
18

2
23
5
24
0.958
23
4
8
23.57%
17.39%
34.78%
5
4
8

6
23
0
24
0.958
23
0
1
1.27%
0.00%
4.35%
0
0
1
EPs Only at
10
23
0
24
0.958
23
0
0
0.02%
0.00%
0.00%
0
0
0
Mixed Water
20
23
0
24
0.958
23
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
23
0
24
0.958
23
0
0
0.00%
0.00%
0.00%
0
0
0

100
23
0
24
0.958
23
0
0
0.00%
0.00%
0.00%
0
0
0

200
23
0
24
0.958
23
0
0
0.00%
0.00%
0.00%
0
0
0

600
23
0
24
0.958
23
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 59 of 114
December 2016

-------
E.4 - CA with CL-OT
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population Served
by EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
4,921,165
1,479,043
21,363,993
0.230
4,921,165
763,613
2,686,748
30.05%
15.52%
54.60%
1,479,043
763,613
2,686,748
4,921,165
392,316
21,363,993
0.230
4,921,165
175,828
674,708
7.97%
3.57%
13.71%
392,316
175,828
674,708
4,921,165
59,444
21,363,993
0.230
4,921,165
0
137,364
1.21%
0.00%
2.79%
59,444
0
137,364
4,921,165
25,525
21,363,993
0.230
4,921,165
0
53,860
0.52%
0.00%
1.09%
25,525
0
53,859
4,921,165
1,412
21,363,993
0.230
4,921,165
0
0
0.03%
0.00%
0.00%
1,412
0
0
4,921,165
0
21,363,993
0.230
4,921,165
0
0
0.00%
0.00%
0.00%
0
0
0
4,921,165
0
21,363,993
0.230
4,921,165
0
0
0.00%
0.00%
0.00%
0
0
0
4,921,165
0
21,363,993
0.230
4,921,165
0
0
0.00%
0.00%
0.00%
0
0
0
4,921,165
0
21,363,993
0.230
4,921,165
0
0
0.00%
0.00%
0.00%
0
0
0
3,827,946
1,022,594
9,764,629
0.392
3,827,946
487,690
1,979,456
26.71%
12.74%
51.71%
1,022,594
487,690
1,979,456
3,827,946
271,488
9,764,629
0.392
3,827,946
123,411
436,985
7.09%
3.22%
11.42%
271,488
123,411
436,985
3,827,946
55,327
9,764,629
0.392
3,827,946
0
123,411
1.45%
0.00%
3.22%
55,327
0
123,411
3,827,946
25,476
9,764,629
0.392
3,827,946
0
53,860
0.67%
0.00%
1.41%
25,476
0
53,859
3,827,946
1,412
9,764,629
0.392
3,827,946
0
0
0.04%
0.00%
0.00%
1,412
0
0
3,827,946
0
9,764,629
0.392
3,827,946
0
0
0.00%
0.00%
0.00%
0
0
0
3,827,946
0
9,764,629
0.392
3,827,946
0
0
0.00%
0.00%
0.00%
0
0
0
3,827,946
0
9,764,629
0.392
3,827,946
0
0
0.00%
0.00%
0.00%
0
0
0
3,827,946
0
9,764,629
0.392
3,827,946
0
0
0.00%
0.00%
0.00%
0
0
0
255,707
36,554
560,393
0.456
255,707
0
112,002
14.30%
0.00%
43.80%
36,554
0
112,002
255,707
3,277
560,393
0.456
255,707
0
36,064
1.28%
0.00%
14.10%
3,277
0
36,064
255,707
0
560,393
0.456
255,707
0
0
0.00%
0.00%
0.00%
0
0
0
255,707
0
560,393
0.456
255,707
0
0
0.00%
0.00%
0.00%
0
0
0
255,707
0
560,393
0.456
255,707
0
0
0.00%
0.00%
0.00%
0
0
0
255,707
0
560,393
0.456
255,707
0
0
0.00%
0.00%
0.00%
0
0
0
255,707
0
560,393
0.456
255,707
0
0
0.00%
0.00%
0.00%
0
0
0
255,707
0
560,393
0.456
255,707
0
0
0.00%
0.00%
0.00%
0
0
0
255,707
0
560,393
0.456
255,707
0
0
0.00%
0.00%
0.00%
0
0
0
837,512
419,895
11,038,971
0.076
837,512
275,922
595,291
50.14%
32.95%
71.08%
419,895
275,922
595,291
837,512
117,551
11,038,971
0.076
837,512
52,417
201,659
14.04%
6.26%
24.08%
117,551
52,417
201,659
837,512
4,117
11,038,971
0.076
837,512
0
13,953
0.49%
0.00%
1.67%
4,117
0
13,953
837,512
49
11,038,971
0.076
837,512
0
0
0.01%
0.00%
0.00%
49
0
0
837,512
0
11,038,971
0.076
837,512
0
0
0.00%
0.00%
0.00%
0
0
0
837,512
0
11,038,971
0.076
837,512
0
0
0.00%
0.00%
0.00%
0
0
0
837,512
0
11,038,971
0.076
837,512
0
0
0.00%
0.00%
0.00%
0
0
0
837,512
0
11,038,971
0.076
837,512
0
0
0.00%
0.00%
0.00%
0
0
0
837,512
0
11,038,971
0.076
837,512
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 60 of 114
December 2016

-------
E.4 - CA with CL-OT
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
National #
MR Ratio
National Number
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
Threshold -
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Exceeding
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
52
40
45
1.156
52
34
47
77.78%
65.38%
90.38%
40
34
47

2
52
20
45
1.156
52
15
25
37.60%
28.85%
48.08%
20
15
25

6
52
3
45
1.156
52

5
5.34%
1.92%
9.62%
3

5

10
52
1
45
1.156
52
0
2
1.44%
0.00%
3.85%
1
0
2
All MRs Only
20
52
0
45
1.156
52
0
0
0.07%
0.00%
0.00%
0
0
0

60
52
0
45
1.156
52
0
0
0.00%
0.00%
0.00%
0
0
0

100
52
0
45
1.156
52
0
0
0.00%
0.00%
0.00%
0
0
0

200
52
0
45
1.156
52
0
0
0.00%
0.00%
0.00%
0
0
0

600
52
0
45
1.156
52
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
19
15
17
1.118
19
12
17
77.08%
63.16%
89.47%
15
12
17

2
19
8
17
1.118
19
6
10
42.00%
31.58%
52.63%
8
6
10

6
19
2
17
1.118
19

3
9.35%
5.26%
15.79%
2

3
MRs Only at
10
19
1
17
1.118
19
0
1
3.25%
0.00%
5.26%
1
0
1
Surface Water
20
19
0
17
1.118
19
0
0
0.20%
0.00%
0.00%
0
0
0
Systems
60
19
0
17
1.118
19
0
0
0.00%
0.00%
0.00%
0
0
0

100
19
0
17
1.118
19
0
0
0.00%
0.00%
0.00%
0
0
0

200
19
0
17
1.118
19
0
0
0.00%
0.00%
0.00%
0
0
0

600
19
0
17
1.118
19
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
5
2
4
1.250
5

4
41.99%
20.00%
80.00%
2

4

2
5
0
4
1.250
5
0
1
3.90%
0.00%
20.00%
0
0
1

6
5
0
4
1.250
5
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
5
0
4
1.250
5
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
5
0
4
1.250
5
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
5
0
4
1.250
5
0
0
0.00%
0.00%
0.00%
0
0
0

100
5
0
4
1.250
5
0
0
0.00%
0.00%
0.00%
0
0
0

200
5
0
4
1.250
5
0
0
0.00%
0.00%
0.00%
0
0
0

600
5
0
4
1.250
5
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
28
24
24
1.167
28
21
26
84.65%
75.00%
92.86%
24
21
26

2
28
11
24
1.167
28
9
14
40.64%
32.14%
50.00%
11
9
14

6
28
1
24
1.167
28
0
2
3.56%
0.00%
7.14%
1
0
2
MRs Only at
10
28
0
24
1.167
28
0
1
0.47%
0.00%
3.57%
0
0
1
Mixed Water
20
28
0
24
1.167
28
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
28
0
24
1.167
28
0
0
0.00%
0.00%
0.00%
0
0
0

100
28
0
24
1.167
28
0
0
0.00%
0.00%
0.00%
0
0
0

200
28
0
24
1.167
28
0
0
0.00%
0.00%
0.00%
0
0
0

600
28
0
24
1.167
28
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 61 of 114
December 2016

-------
E.4 - CA with CL-OT
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population Served
by MRs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
3,816,248
2,795,647
21,363,993
0.179
3,816,248
1,782,901
3,569,206
73.26%
46.72%
93.53%
2,795,647
1,782,901
3,569,206
3,816,248
1,166,445
21,363,993
0.179
3,816,248
831,152
2,046,180
30.57%
21.78%
53.62%
1,166,445
831,152
2,046,180
3,816,248
169,210
21,363,993
0.179
3,816,248
53,860
446,414
4.43%
1.41%
11.70%
169,210
53,860
446,414
3,816,248
38,838
21,363,993
0.179
3,816,248
0
115,360
1.02%
0.00%
3.02%
38,838
0
115,360
3,816,248
2,017
21,363,993
0.179
3,816,248
0
0
0.05%
0.00%
0.00%
2,017
0
0
3,816,248
0
21,363,993
0.179
3,816,248
0
0
0.00%
0.00%
0.00%
0
0
0
3,816,248
0
21,363,993
0.179
3,816,248
0
0
0.00%
0.00%
0.00%
0
0
0
3,816,248
0
21,363,993
0.179
3,816,248
0
0
0.00%
0.00%
0.00%
0
0
0
3,816,248
0
21,363,993
0.179
3,816,248
0
0
0.00%
0.00%
0.00%
0
0
0
2,696,184
2,009,505
9,764,629
0.276
2,696,184
1,192,388
2,512,814
74.53%
44.23%
93.20%
2,009,505
1,192,388
2,512,814
2,696,184
882,406
9,764,629
0.276
2,696,184
657,305
1,601,476
32.73%
24.38%
59.40%
882,406
657,305
1,601,476
2,696,184
157,838
9,764,629
0.276
2,696,184
53,860
417,162
5.85%
2.00%
15.47%
157,838
53,860
417,162
2,696,184
37,661
9,764,629
0.276
2,696,184
0
106,378
1.40%
0.00%
3.95%
37,661
0
106,378
2,696,184
2,017
9,764,629
0.276
2,696,184
0
0
0.07%
0.00%
0.00%
2,017
0
0
2,696,184
0
9,764,629
0.276
2,696,184
0
0
0.00%
0.00%
0.00%
0
0
0
2,696,184
0
9,764,629
0.276
2,696,184
0
0
0.00%
0.00%
0.00%
0
0
0
2,696,184
0
9,764,629
0.276
2,696,184
0
0
0.00%
0.00%
0.00%
0
0
0
2,696,184
0
9,764,629
0.276
2,696,184
0
0
0.00%
0.00%
0.00%
0
0
0
196,321
79,521
560,393
0.350
196,321
27,338
191,609
40.51%
13.92%
97.60%
79,521
27,338
191,609
196,321
6,945
560,393
0.350
196,321
0
52,270
3.54%
0.00%
26.62%
6,945
0
52,270
196,321
0
560,393
0.350
196,321
0
0
0.00%
0.00%
0.00%
0
0
0
196,321
0
560,393
0.350
196,321
0
0
0.00%
0.00%
0.00%
0
0
0
196,321
0
560,393
0.350
196,321
0
0
0.00%
0.00%
0.00%
0
0
0
196,321
0
560,393
0.350
196,321
0
0
0.00%
0.00%
0.00%
0
0
0
196,321
0
560,393
0.350
196,321
0
0
0.00%
0.00%
0.00%
0
0
0
196,321
0
560,393
0.350
196,321
0
0
0.00%
0.00%
0.00%
0
0
0
196,321
0
560,393
0.350
196,321
0
0
0.00%
0.00%
0.00%
0
0
0
923,743
706,621
11,038,971
0.084
923,743
563,176
864,783
76.50%
60.97%
93.62%
706,621
563,176
864,783
923,743
277,094
11,038,971
0.084
923,743
173,848
392,434
30.00%
18.82%
42.48%
277,094
173,848
392,434
923,743
11,373
11,038,971
0.084
923,743
0
29,252
1.23%
0.00%
3.17%
11,373
0
29,252
923,743
1,177
11,038,971
0.084
923,743
0
8,982
0.13%
0.00%
0.97%
1,177
0
8,982
923,743
0
11,038,971
0.084
923,743
0
0
0.00%
0.00%
0.00%
0
0
0
923,743
0
11,038,971
0.084
923,743
0
0
0.00%
0.00%
0.00%
0
0
0
923,743
0
11,038,971
0.084
923,743
0
0
0.00%
0.00%
0.00%
0
0
0
923,743
0
11,038,971
0.084
923,743
0
0
0.00%
0.00%
0.00%
0
0
0
923,743
0
11,038,971
0.084
923,743
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 62 of 114
December 2016

-------
E.4 - CA with CL-OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2 EPs
Number of
UCMR 2 EPs with
Predicted Mean
Exceeding
Threshold
National #
Systems
EP Ratio
National Number
of EPs
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All EPs Only
0.6
95
47
1,445
1.274
1,841
34
65
49.82%
35.79%
68.42%
856
540
1,251
2
95
24
1,445
1.274
1,841
18
33
25.63%
18.95%
35.11%
531
412
695
6
95
9
1,445
1.274
1,841
5
14
9.60%
5.26%
14.74%
290
188
401
10
95
5
1,445
1.274
1,841
3
8
5.79%
3.16%
8.42%
180
99
279
20
95
2
1,445
1.274
1,841

4
1.95%
1.05%
4.21%
37
9
107
60
95
0
1,445
1.274
1,841
0
1
0.10%
0.00%
1.05%
1
0
9
100
95
0
1,445
1.274
1,841
0
0
0.01%
0.00%
0.00%
0
0
0
200
95
0
1,445
1.274
1,841
0
0
0.00%
0.00%
0.00%
0
0
0
600
95
0
1,445
1.274
1,841
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
41
22
154
1.052
162
17
28
52.53%
41.46%
68.29%
123
104
149
2
41
13
154
1.052
162
9
16
30.69%
21.95%
39.02%
86
65
103
6
41
6
154
1.052
162
3
8
13.89%
7.32%
19.51%
43
27
56
10
41
4
154
1.052
162
2
5
8.80%
4.88%
12.20%
29
18
37
20
41
2
154
1.052
162

3
3.82%
2.44%
7.32%
14
9
27
60
41
0
154
1.052
162
0
1
0.24%
0.00%
2.44%
1
0
9
100
41
0
154
1.052
162
0
0
0.01%
0.00%
0.00%
0
0
0
200
41
0
154
1.052
162
0
0
0.00%
0.00%
0.00%
0
0
0
600
41
0
154
1.052
162
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
14
2
493
1.659
819
0
6
12.75%
0.00%
42.86%
114
0
332
2
14
0
493
1.659
819
0
1
0.99%
0.00%
9.64%
8
0
57
6
14
0
493
1.659
819
0
0
0.00%
0.00%
0.00%
0
0
0
10
14
0
493
1.659
819
0
0
0.00%
0.00%
0.00%
0
0
0
20
14
0
493
1.659
819
0
0
0.00%
0.00%
0.00%
0
0
0
60
14
0
493
1.659
819
0
0
0.00%
0.00%
0.00%
0
0
0
100
14
0
493
1.659
819
0
0
0.00%
0.00%
0.00%
0
0
0
200
14
0
493
1.659
819
0
0
0.00%
0.00%
0.00%
0
0
0
600
14
0
493
1.659
819
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
40
24
797
1.079
861
17
31
60.02%
42.50%
77.50%
619
435
770
2
40
12
797
1.079
861
9
16
29.06%
22.50%
40.00%
436
348
534
6
40
3
797
1.079
861
2
6
8.57%
5.00%
15.00%
247
161
345
10
40
2
797
1.079
861

3
4.72%
2.50%
7.50%
152
81
242
20
40
0
797
1.079
861
0
1
0.72%
0.00%
2.50%
23
0
81
60
40
0
797
1.079
861
0
0
0.00%
0.00%
0.00%
0
0
0
100
40
0
797
1.079
861
0
0
0.00%
0.00%
0.00%
0
0
0
200
40
0
797
1.079
861
0
0
0.00%
0.00%
0.00%
0
0
0
600
40
0
797
1.079
861
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 63 of 114
December 2016

-------
E.4 - CA with CL-OT
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population Served
by EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
5,072,058
1,550,597
28,628,587
0.240
6,876,123
802,534
2,815,702
30.57%
15.82%
55.51%
2,415,973
1,258,709
4,189,420
5,072,058
430,296
28,628,587
0.240
6,876,123
206,622
727,561
8.48%
4.07%
14.34%
900,542
600,484
1,429,313
5,072,058
71,438
28,628,587
0.240
6,876,123
5,581
164,622
1.41%
0.11%
3.25%
237,139
62,796
544,784
5,072,058
31,456
28,628,587
0.240
6,876,123
3,181
64,481
0.62%
0.06%
1.27%
107,347
27,650
219,467
5,072,058
3,594
28,628,587
0.240
6,876,123
1,086
3,858
0.07%
0.02%
0.08%
16,616
5,294
42,254
5,072,058
109
28,628,587
0.240
6,876,123
0
1,086
0.00%
0.00%
0.02%
532
0
5,294
5,072,058
6
28,628,587
0.240
6,876,123
0
0
0.00%
0.00%
0.00%
30
0
0
5,072,058
0
28,628,587
0.240
6,876,123
0
0
0.00%
0.00%
0.00%
0
0
0
5,072,058
0
28,628,587
0.240
6,876,123
0
0
0.00%
0.00%
0.00%
0
0
0
3,880,657
1,056,023
10,490,027
0.392
4,106,851
511,029
2,032,167
27.21%
13.17%
52.37%
1,191,453
601,466
2,258,361
3,880,657
292,465
10,490,027
0.392
4,106,851
139,452
461,743
7.54%
3.59%
11.90%
374,012
201,612
557,682
3,880,657
63,367
10,490,027
0.392
4,106,851
4,622
135,917
1.63%
0.12%
3.50%
94,521
22,533
184,376
3,880,657
29,941
10,490,027
0.392
4,106,851
2,854
61,416
0.77%
0.07%
1.58%
47,244
13,913
90,696
3,880,657
3,471
10,490,027
0.392
4,106,851
1,086
3,226
0.09%
0.03%
0.08%
11,450
5,294
15,727
3,880,657
109
10,490,027
0.392
4,106,851
0
1,086
0.00%
0.00%
0.03%
532
0
5,294
3,880,657
6
10,490,027
0.392
4,106,851
0
0
0.00%
0.00%
0.00%
30
0
0
3,880,657
0
10,490,027
0.392
4,106,851
0
0
0.00%
0.00%
0.00%
0
0
0
3,880,657
0
10,490,027
0.392
4,106,851
0
0
0.00%
0.00%
0.00%
0
0
0
286,934
41,971
1,170,551
0.516
604,057
0
140,724
14.63%
0.00%
49.04%
92,122
0
344,090
286,934
3,689
1,170,551
0.516
604,057
0
36,118
1.29%
0.00%
12.59%
7,935
0
38,581
286,934
0
1,170,551
0.516
604,057
0
0
0.00%
0.00%
0.00%
0
0
0
286,934
0
1,170,551
0.516
604,057
0
0
0.00%
0.00%
0.00%
0
0
0
286,934
0
1,170,551
0.516
604,057
0
0
0.00%
0.00%
0.00%
0
0
0
286,934
0
1,170,551
0.516
604,057
0
0
0.00%
0.00%
0.00%
0
0
0
286,934
0
1,170,551
0.516
604,057
0
0
0.00%
0.00%
0.00%
0
0
0
286,934
0
1,170,551
0.516
604,057
0
0
0.00%
0.00%
0.00%
0
0
0
286,934
0
1,170,551
0.516
604,057
0
0
0.00%
0.00%
0.00%
0
0
0
904,467
452,603
16,968,009
0.128
2,165,216
291,505
642,812
50.04%
32.23%
71.07%
1,132,399
657,242
1,586,969
904,467
134,143
16,968,009
0.128
2,165,216
67,170
229,700
14.83%
7.43%
25.40%
518,594
398,872
833,050
904,467
8,072
16,968,009
0.128
2,165,216
959
28,706
0.89%
0.11%
3.17%
142,618
40,263
360,408
904,467
1,515
16,968,009
0.128
2,165,216
327
3,066
0.17%
0.04%
0.34%
60,104
13,736
128,771
904,467
123
16,968,009
0.128
2,165,216
0
632
0.01%
0.00%
0.07%
5,166
0
26,527
904,467
0
16,968,009
0.128
2,165,216
0
0
0.00%
0.00%
0.00%
0
0
0
904,467
0
16,968,009
0.128
2,165,216
0
0
0.00%
0.00%
0.00%
0
0
0
904,467
0
16,968,009
0.128
2,165,216
0
0
0.00%
0.00%
0.00%
0
0
0
904,467
0
16,968,009
0.128
2,165,216
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 64 of 114
December 2016

-------
E.4 - CA with CL-OT
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
National #
MR Ratio
National Number
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
Threshold -
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Exceeding
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Extrapolation
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
89
71
1,445
1.049
1,516
58
83
79.52%
65.17%
93.26%
1,071
738
1,351

2
89
38
1,445
1.049
1,516
30
49
43.04%
33.71%
55.06%
623
520
868

6
89
12
1,445
1.049
1,516
8
18
13.95%
8.99%
20.22%
321
207
420

10
89
6
1,445
1.049
1,516
3
11
7.18%
3.37%
12.36%
154
27
298
All MRs Only
20
89
3
1,445
1.049
1,516
2
4
3.16%
2.25%
4.49%
31
18
107

60
89
0
1,445
1.049
1,516
0
1
0.27%
0.00%
1.12%
2
0
9

100
89
0
1,445
1.049
1,516
0
0
0.02%
0.00%
0.00%
0
0
0

200
89
0
1,445
1.049
1,516
0
0
0.00%
0.00%
0.00%
0
0
0

600
89
0
1,445
1.049
1,516
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
35
29
154
1.013
156
25
33
83.64%
71.43%
94.29%
141
125
154

2
35
19
154
1.013
156
15
23
53.23%
42.86%
65.71%
102
87
123

6
35
8
154
1.013
156
6
11
22.91%
17.14%
31.43%
58
46
75
MRs Only at
10
35
5
154
1.013
156
3
7
13.75%
8.57%
20.00%
38
27
55
Surface Water
20
35
3
154
1.013
156
2
3
7.81%
5.71%
8.57%
24
18
27
Systems
60
35
0
154
1.013
156
0
1
0.67%
0.00%
2.86%
2
0
9

100
35
0
154
1.013
156
0
0
0.06%
0.00%
0.00%
0
0
0

200
35
0
154
1.013
156
0
0
0.00%
0.00%
0.00%
0
0
0

600
35
0
154
1.013
156
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
9
4
493
1.002
494

7
40.28%
11.11%
77.78%
187

333

2
9
0
493
1.002
494
0
2
3.77%
0.00%
22.22%
18
0
162

6
9
0
493
1.002
494
0
0
0.02%
0.00%
0.00%
0
0
0
MRs Only at
10
9
0
493
1.002
494
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
9
0
493
1.002
494
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
9
0
493
1.002
494
0
0
0.00%
0.00%
0.00%
0
0
0

100
9
0
493
1.002
494
0
0
0.00%
0.00%
0.00%
0
0
0

200
9
0
493
1.002
494
0
0
0.00%
0.00%
0.00%
0
0
0

600
9
0
493
1.002
494
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
45
38
797
1.086
866
32
43
84.17%
71.11%
95.56%
743
612
864

2
45
19
797
1.086
866
15
24
42.97%
33.33%
53.33%
503
433
583

6
45
4
797
1.086
866
2
7
9.77%
4.44%
15.56%
263
161
346
MRs Only at
10
45
2
797
1.086
866
0
4
3.50%
0.00%
8.89%
116
0
243
Mixed Water
20
45
0
797
1.086
866
0
1
0.18%
0.00%
2.22%
6
0
81
Systems
60
45
0
797
1.086
866
0
0
0.00%
0.00%
0.00%
0
0
0

100
45
0
797
1.086
866
0
0
0.00%
0.00%
0.00%
0
0
0

200
45
0
797
1.086
866
0
0
0.00%
0.00%
0.00%
0
0
0

600
45
0
797
1.086
866
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 65 of 114
December 2016

-------
E.4 - CA with CL-OT
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population Served
by MRs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
3,960,096
2,900,717
28,628,587
0.195
5,595,088
1,851,845
3,712,899
73.25%
46.76%
93.76%
4,140,347
2,700,565
5,340,854
3,960,096
1,215,844
28,628,587
0.195
5,595,088
865,299
2,112,664
30.70%
21.85%
53.35%
1,811,774
1,259,918
2,959,750
3,960,096
187,381
28,628,587
0.195
5,595,088
64,238
478,893
4.73%
1.62%
12.09%
361,492
140,047
860,497
3,960,096
47,964
28,628,587
0.195
5,595,088
4,622
131,087
1.21%
0.12%
3.31%
114,359
22,533
256,250
3,960,096
6,274
28,628,587
0.195
5,595,088
2,854
5,056
0.16%
0.07%
0.13%
24,318
13,913
40,746
3,960,096
281
28,628,587
0.195
5,595,088
0
1,086
0.01%
0.00%
0.03%
1,368
0
5,294
3,960,096
22
28,628,587
0.195
5,595,088
0
0
0.00%
0.00%
0.00%
109
0
0
3,960,096
0
28,628,587
0.195
5,595,088
0
0
0.00%
0.00%
0.00%
0
0
0
3,960,096
0
28,628,587
0.195
5,595,088
0
0
0.00%
0.00%
0.00%
0
0
0
2,748,895
2,052,247
10,490,027
0.284
2,975,089
1,223,346
2,565,526
74.66%
44.50%
93.33%
2,232,490
1,349,525
2,791,719
2,748,895
906,779
10,490,027
0.284
2,975,089
677,028
1,632,670
32.99%
24.63%
59.39%
1,003,378
753,457
1,759,763
2,748,895
171,709
10,490,027
0.284
2,975,089
63,280
435,394
6.25%
2.30%
15.84%
225,462
99,784
506,045
2,748,895
45,882
10,490,027
0.284
2,975,089
4,622
120,375
1.67%
0.17%
4.38%
77,739
22,533
174,618
2,748,895
6,232
10,490,027
0.284
2,975,089
2,854
4,622
0.23%
0.10%
0.17%
22,565
13,913
22,533
2,748,895
281
10,490,027
0.284
2,975,089
0
1,086
0.01%
0.00%
0.04%
1,368
0
5,294
2,748,895
22
10,490,027
0.284
2,975,089
0
0
0.00%
0.00%
0.00%
109
0
0
2,748,895
0
10,490,027
0.284
2,975,089
0
0
0.00%
0.00%
0.00%
0
0
0
2,748,895
0
10,490,027
0.284
2,975,089
0
0
0.00%
0.00%
0.00%
0
0
0
225,683
91,011
1,170,551
0.391
458,130
27,338
220,816
40.33%
12.11%
97.84%
181,929
27,338
446,226
225,683
7,957
1,170,551
0.391
458,130
0
53,202
3.53%
0.00%
23.57%
16,791
0
95,540
225,683
2
1,170,551
0.391
458,130
0
0
0.00%
0.00%
0.00%
81
0
0
225,683
0
1,170,551
0.391
458,130
0
0
0.00%
0.00%
0.00%
0
0
0
225,683
0
1,170,551
0.391
458,130
0
0
0.00%
0.00%
0.00%
0
0
0
225,683
0
1,170,551
0.391
458,130
0
0
0.00%
0.00%
0.00%
0
0
0
225,683
0
1,170,551
0.391
458,130
0
0
0.00%
0.00%
0.00%
0
0
0
225,683
0
1,170,551
0.391
458,130
0
0
0.00%
0.00%
0.00%
0
0
0
225,683
0
1,170,551
0.391
458,130
0
0
0.00%
0.00%
0.00%
0
0
0
985,518
757,459
16,968,009
0.127
2,161,870
601,161
926,557
76.86%
61.00%
94.02%
1,725,927
1,323,703
2,102,910
985,518
301,108
16,968,009
0.127
2,161,870
188,271
426,792
30.55%
19.10%
43.31%
791,604
506,461
1,104,448
985,518
15,670
16,968,009
0.127
2,161,870
959
43,499
1.59%
0.10%
4.41%
135,949
40,263
354,452
985,518
2,082
16,968,009
0.127
2,161,870
0
10,712
0.21%
0.00%
1.09%
36,620
0
81,633
985,518
42
16,968,009
0.127
2,161,870
0
434
0.00%
0.00%
0.04%
1,753
0
18,213
985,518
0
16,968,009
0.127
2,161,870
0
0
0.00%
0.00%
0.00%
0
0
0
985,518
0
16,968,009
0.127
2,161,870
0
0
0.00%
0.00%
0.00%
0
0
0
985,518
0
16,968,009
0.127
2,161,870
0
0
0.00%
0.00%
0.00%
0
0
0
985,518
0
16,968,009
0.127
2,161,870
0
0
0.00%
0.00%
0.00%
0
0
0
Appenidx E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 66 of 114
December 2016

-------
E.5-CL with OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2 EPs
Number of
UCMR 2 EPs with
Predicted Mean
Exceeding
Threshold
National #
Systems
EP Ratio
National Number
of EPs
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All EPs Only
0.6
1
0
9
1.000
9
0
0
3.56%
0.00%
0.00%
0
0
0
2
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
6
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
10
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
20
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
60
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
1
0
9
1.000
9
0
0
3.56%
0.00%
0.00%
0
0
0
2
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
6
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
10
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
20
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
60
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 67 of 114
December 2016

-------
E.5-CL with OT
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
National Pop.
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Predicted Mean
Exceeding
Threshold
Served
Lower Bound
Upper Bound
Mean Exceeding
Threshold -
National
Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound








Extrapolation











SMALL SYSTEMS (Serving <
10,000)





4,501
160
22,661
0.500
11,331
0
0
3.56%
0.00%
0.00%
403
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
160
22,661
0.500
11,331
0
0
3.56%
0.00%
0.00%
403
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 68 of 114
December 2016

-------
E.5-CL with OT







90% CI on Number of UCMR 2 MRs

90% CI on Percentage of MRs with
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
Predicted Mean
National #
MR Ratio
National Number
with Predicted Mean Exceeding
Threshold
MRs with
Predicted Mean
Exceeding
Predicted Mean Exceeding
Threshold - National Extrapolation
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)

0.6
1
0
9
1.000
9
0
1
20.97%
0.00%
100.00%
2
0
9

2
1
0
9
1.000
9
0
0
0.56%
0.00%
0.00%
0
0
0

6
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

10
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
All MRs Only
20
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

60
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
0
9
1.000
9
0
1
20.97%
0.00%
100.00%
2
0
9

2
1
0
9
1.000
9
0
0
0.56%
0.00%
0.00%
0
0
0

6
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
20
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 69 of 114
December 2016

-------
E.5-CL with OT
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
National Pop.
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Predicted Mean
Exceeding
Threshold
Served
Lower Bound
Upper Bound
Mean Exceeding
Threshold -
National
Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound








Extrapolation











SMALL SYSTEMS (Serving <
10,000)





4,501
944
22,661
0.500
11,331
0
4,501
20.97%
0.00%
100.00%
2,376
0
11,331
4,501
25
22,661
0.500
11,331
0
0
0.56%
0.00%
0.00%
64
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
944
22,661
0.500
11,331
0
4,501
20.97%
0.00%
100.00%
2,376
0
11,331
4,501
25
22,661
0.500
11,331
0
0
0.56%
0.00%
0.00%
64
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
4,501
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 70 of 114
December 2016

-------
E.5-CL with OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2 EPs
Number of
UCMR 2 EPs with
Predicted Mean
Exceeding
Threshold
National #
Systems
EP Ratio
National Number
of EPs
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
All EPs Only
0.6
12
0
88
1.663
147
0
3
3.37%
0.00%
25.00%
4
0
37
2
12
0
88
1.663
147
0
0
0.09%
0.00%
0.00%
0
0
0
6
12
0
88
1.663
147
0
0
0.00%
0.00%
0.00%
0
0
0
10
12
0
88
1.663
147
0
0
0.00%
0.00%
0.00%
0
0
0
20
12
0
88
1.663
147
0
0
0.00%
0.00%
0.00%
0
0
0
60
12
0
88
1.663
147
0
0
0.00%
0.00%
0.00%
0
0
0
100
12
0
88
1.663
147
0
0
0.00%
0.00%
0.00%
0
0
0
200
12
0
88
1.663
147
0
0
0.00%
0.00%
0.00%
0
0
0
600
12
0
88
1.663
147
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
1
0
6
1.000
6
0
0
2.25%
0.00%
0.00%
0
0
0
2
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0
6
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0
10
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0
20
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0
60
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
7
0
40
1.400
55
0
2
4.17%
0.00%
28.57%
2
0
16
2
7
0
40
1.400
55
0
0
0.13%
0.00%
0.00%
0
0
0
6
7
0
40
1.400
55
0
0
0.00%
0.00%
0.00%
0
0
0
10
7
0
40
1.400
55
0
0
0.00%
0.00%
0.00%
0
0
0
20
7
0
40
1.400
55
0
0
0.00%
0.00%
0.00%
0
0
0
60
7
0
40
1.400
55
0
0
0.00%
0.00%
0.00%
0
0
0
100
7
0
40
1.400
55
0
0
0.00%
0.00%
0.00%
0
0
0
200
7
0
40
1.400
55
0
0
0.00%
0.00%
0.00%
0
0
0
600
7
0
40
1.400
55
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
4
0
43
2.000
86
0
1
2.25%
0.00%
25.00%
2
0
21
2
4
0
43
2.000
86
0
0
0.05%
0.00%
0.00%
0
0
0
6
4
0
43
2.000
86
0
0
0.00%
0.00%
0.00%
0
0
0
10
4
0
43
2.000
86
0
0
0.00%
0.00%
0.00%
0
0
0
20
4
0
43
2.000
86
0
0
0.00%
0.00%
0.00%
0
0
0
60
4
0
43
2.000
86
0
0
0.00%
0.00%
0.00%
0
0
0
100
4
0
43
2.000
86
0
0
0.00%
0.00%
0.00%
0
0
0
200
4
0
43
2.000
86
0
0
0.00%
0.00%
0.00%
0
0
0
600
4
0
43
2.000
86
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 71 of 114
December 2016

-------
E.5-CL with OT
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
96,533
2,352
2,658,633
0.364
966,552
0
15,559
2.44%
0.00%
16.12%
22,724
0
190,961
96,533
45
2,658,633
0.364
966,552
0
0
0.05%
0.00%
0.00%
498
0
0
96,533
0
2,658,633
0.364
966,552
0
0
0.00%
0.00%
0.00%
0
0
0
96,533
0
2,658,633
0.364
966,552
0
0
0.00%
0.00%
0.00%
0
0
0
96,533
0
2,658,633
0.364
966,552
0
0
0.00%
0.00%
0.00%
0
0
0
96,533
0
2,658,633
0.364
966,552
0
0
0.00%
0.00%
0.00%
0
0
0
96,533
0
2,658,633
0.364
966,552
0
0
0.00%
0.00%
0.00%
0
0
0
96,533
0
2,658,633
0.364
966,552
0
0
0.00%
0.00%
0.00%
0
0
0
96,533
0
2,658,633
0.364
966,552
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
434
204,070
0.250
51,017
0
0
2.25%
0.00%
0.00%
1,146
0
0
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
25,409
779
1,022,776
0.163
167,097
0
4,297
3.07%
0.00%
16.91%
5,124
0
28,260
25,409
20
1,022,776
0.163
167,097
0
0
0.08%
0.00%
0.00%
132
0
0
25,409
0
1,022,776
0.163
167,097
0
0
0.00%
0.00%
0.00%
0
0
0
25,409
0
1,022,776
0.163
167,097
0
0
0.00%
0.00%
0.00%
0
0
0
25,409
0
1,022,776
0.163
167,097
0
0
0.00%
0.00%
0.00%
0
0
0
25,409
0
1,022,776
0.163
167,097
0
0
0.00%
0.00%
0.00%
0
0
0
25,409
0
1,022,776
0.163
167,097
0
0
0.00%
0.00%
0.00%
0
0
0
25,409
0
1,022,776
0.163
167,097
0
0
0.00%
0.00%
0.00%
0
0
0
25,409
0
1,022,776
0.163
167,097
0
0
0.00%
0.00%
0.00%
0
0
0
51,804
1,139
1,431,788
0.523
748,437
0
11,262
2.20%
0.00%
21.74%
16,453
0
162,702
51,804
25
1,431,788
0.523
748,437
0
0
0.05%
0.00%
0.00%
366
0
0
51,804
0
1,431,788
0.523
748,437
0
0
0.00%
0.00%
0.00%
0
0
0
51,804
0
1,431,788
0.523
748,437
0
0
0.00%
0.00%
0.00%
0
0
0
51,804
0
1,431,788
0.523
748,437
0
0
0.00%
0.00%
0.00%
0
0
0
51,804
0
1,431,788
0.523
748,437
0
0
0.00%
0.00%
0.00%
0
0
0
51,804
0
1,431,788
0.523
748,437
0
0
0.00%
0.00%
0.00%
0
0
0
51,804
0
1,431,788
0.523
748,437
0
0
0.00%
0.00%
0.00%
0
0
0
51,804
0
1,431,788
0.523
748,437
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 72 of 114
December 2016

-------
E.5-CL with OT







90% CI on Number of UCMR 2 MRs

90% CI on Percentage of MRs with
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
Predicted Mean
National #
MR Ratio
National Number
with Predicted Mean Exceeding
Threshold
MRs with
Predicted Mean
Exceeding
Predicted Mean Exceeding
Threshold - National Extrapolation
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)

0.6
11
1
88
1.268
112
0
4
7.81%
0.00%
36.36%
11
0
43

2
11
0
88
1.268
112
0
0
0.22%
0.00%
0.00%
0
0
0

6
11
0
88
1.268
112
0
0
0.00%
0.00%
0.00%
0
0
0

10
11
0
88
1.268
112
0
0
0.00%
0.00%
0.00%
0
0
0
All MRs Only
20
11
0
88
1.268
112
0
0
0.00%
0.00%
0.00%
0
0
0

60
11
0
88
1.268
112
0
0
0.00%
0.00%
0.00%
0
0
0

100
11
0
88
1.268
112
0
0
0.00%
0.00%
0.00%
0
0
0

200
11
0
88
1.268
112
0
0
0.00%
0.00%
0.00%
0
0
0

600
11
0
88
1.268
112
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
0
6
1.000
6
0
1
14.42%
0.00%
100.00%
1
0
6

2
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0

6
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
20
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
0
6
1.000
6
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
8
0
40
1.600
63
0
2
4.42%
0.00%
25.00%
3
0
16

2
8
0
40
1.600
63
0
0
0.09%
0.00%
0.00%
0
0
0

6
8
0
40
1.600
63
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
8
0
40
1.600
63
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
8
0
40
1.600
63
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
8
0
40
1.600
63
0
0
0.00%
0.00%
0.00%
0
0
0

100
8
0
40
1.600
63
0
0
0.00%
0.00%
0.00%
0
0
0

200
8
0
40
1.600
63
0
0
0.00%
0.00%
0.00%
0
0
0

600
8
0
40
1.600
63
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
2
0
43
1.000
43
0
1
18.07%
0.00%
50.00%
8
0
21

2
2
0
43
1.000
43
0
0
0.84%
0.00%
0.00%
0
0
0

6
2
0
43
1.000
43
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
2
0
43
1.000
43
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
2
0
43
1.000
43
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
2
0
43
1.000
43
0
0
0.00%
0.00%
0.00%
0
0
0

100
2
0
43
1.000
43
0
0
0.00%
0.00%
0.00%
0
0
0

200
2
0
43
1.000
43
0
0
0.00%
0.00%
0.00%
0
0
0

600
2
0
43
1.000
43
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 73 of 114
December 2016

-------
E.5-CL with OT
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
71,557
9,222
2,658,633
0.222
589,553
0
50,334
12.89%
0.00%
70.34%
85,606
0
361,346
71,557
233
2,658,633
0.222
589,553
0
0
0.33%
0.00%
0.00%
3,290
0
0
71,557
0
2,658,633
0.222
589,553
0
0
0.00%
0.00%
0.00%
0
0
0
71,557
0
2,658,633
0.222
589,553
0
0
0.00%
0.00%
0.00%
0
0
0
71,557
0
2,658,633
0.222
589,553
0
0
0.00%
0.00%
0.00%
0
0
0
71,557
0
2,658,633
0.222
589,553
0
0
0.00%
0.00%
0.00%
0
0
0
71,557
0
2,658,633
0.222
589,553
0
0
0.00%
0.00%
0.00%
0
0
0
71,557
0
2,658,633
0.222
589,553
0
0
0.00%
0.00%
0.00%
0
0
0
71,557
0
2,658,633
0.222
589,553
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
2,786
204,070
0.250
51,017
0
19,320
14.42%
0.00%
100.00%
7,356
0
51,017
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
19,320
0
204,070
0.250
51,017
0
0
0.00%
0.00%
0.00%
0
0
0
27,461
1,873
1,022,776
0.177
180,589
0
17,500
6.82%
0.00%
63.73%
12,315
0
115,083
27,461
9
1,022,776
0.177
180,589
0
0
0.03%
0.00%
0.00%
60
0
0
27,461
0
1,022,776
0.177
180,589
0
0
0.00%
0.00%
0.00%
0
0
0
27,461
0
1,022,776
0.177
180,589
0
0
0.00%
0.00%
0.00%
0
0
0
27,461
0
1,022,776
0.177
180,589
0
0
0.00%
0.00%
0.00%
0
0
0
27,461
0
1,022,776
0.177
180,589
0
0
0.00%
0.00%
0.00%
0
0
0
27,461
0
1,022,776
0.177
180,589
0
0
0.00%
0.00%
0.00%
0
0
0
27,461
0
1,022,776
0.177
180,589
0
0
0.00%
0.00%
0.00%
0
0
0
27,461
0
1,022,776
0.177
180,589
0
0
0.00%
0.00%
0.00%
0
0
0
24,776
4,564
1,431,788
0.250
357,947
0
13,514
18.42%
0.00%
54.55%
65,934
0
195,245
24,776
224
1,431,788
0.250
357,947
0
0
0.90%
0.00%
0.00%
3,230
0
0
24,776
0
1,431,788
0.250
357,947
0
0
0.00%
0.00%
0.00%
0
0
0
24,776
0
1,431,788
0.250
357,947
0
0
0.00%
0.00%
0.00%
0
0
0
24,776
0
1,431,788
0.250
357,947
0
0
0.00%
0.00%
0.00%
0
0
0
24,776
0
1,431,788
0.250
357,947
0
0
0.00%
0.00%
0.00%
0
0
0
24,776
0
1,431,788
0.250
357,947
0
0
0.00%
0.00%
0.00%
0
0
0
24,776
0
1,431,788
0.250
357,947
0
0
0.00%
0.00%
0.00%
0
0
0
24,776
0
1,431,788
0.250
357,947
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 74 of 114
December 2016

-------
E.5-CL with OT
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2 EPs
Number of
UCMR 2 EPs with
Predicted Mean
Exceeding
Threshold
National #
Systems
EP Ratio
National Number
of EPs
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All EPs Only
0.6
25
2
13
1.923
25

5
8.02%
4.00%
20.00%
2

5
2
25
1
13
1.923
25
0
1
2.55%
0.00%
4.00%
1
0
1
6
25
0
13
1.923
25
0
0
0.02%
0.00%
0.00%
0
0
0
10
25
0
13
1.923
25
0
0
0.00%
0.00%
0.00%
0
0
0
20
25
0
13
1.923
25
0
0
0.00%
0.00%
0.00%
0
0
0
60
25
0
13
1.923
25
0
0
0.00%
0.00%
0.00%
0
0
0
100
25
0
13
1.923
25
0
0
0.00%
0.00%
0.00%
0
0
0
200
25
0
13
1.923
25
0
0
0.00%
0.00%
0.00%
0
0
0
600
25
0
13
1.923
25
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
5
0
6
0.833
5
0
1
1.61%
0.00%
20.00%
0
0
1
2
5
0
6
0.833
5
0
0
0.00%
0.00%
0.00%
0
0
0
6
5
0
6
0.833
5
0
0
0.00%
0.00%
0.00%
0
0
0
10
5
0
6
0.833
5
0
0
0.00%
0.00%
0.00%
0
0
0
20
5
0
6
0.833
5
0
0
0.00%
0.00%
0.00%
0
0
0
60
5
0
6
0.833
5
0
0
0.00%
0.00%
0.00%
0
0
0
100
5
0
6
0.833
5
0
0
0.00%
0.00%
0.00%
0
0
0
200
5
0
6
0.833
5
0
0
0.00%
0.00%
0.00%
0
0
0
600
5
0
6
0.833
5
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
12
0
4
3.000
12
0
1
0.73%
0.00%
8.33%
0
0
1
2
12
0
4
3.000
12
0
0
0.00%
0.00%
0.00%
0
0
0
6
12
0
4
3.000
12
0
0
0.00%
0.00%
0.00%
0
0
0
10
12
0
4
3.000
12
0
0
0.00%
0.00%
0.00%
0
0
0
20
12
0
4
3.000
12
0
0
0.00%
0.00%
0.00%
0
0
0
60
12
0
4
3.000
12
0
0
0.00%
0.00%
0.00%
0
0
0
100
12
0
4
3.000
12
0
0
0.00%
0.00%
0.00%
0
0
0
200
12
0
4
3.000
12
0
0
0.00%
0.00%
0.00%
0
0
0
600
12
0
4
3.000
12
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
8
2
3
2.667
8

3
22.96%
12.50%
37.50%
2

3
2
8
1
3
2.667
8
0
1
7.96%
0.00%
12.50%
1
0
1
6
8
0
3
2.667
8
0
0
0.07%
0.00%
0.00%
0
0
0
10
8
0
3
2.667
8
0
0
0.00%
0.00%
0.00%
0
0
0
20
8
0
3
2.667
8
0
0
0.00%
0.00%
0.00%
0
0
0
60
8
0
3
2.667
8
0
0
0.00%
0.00%
0.00%
0
0
0
100
8
0
3
2.667
8
0
0
0.00%
0.00%
0.00%
0
0
0
200
8
0
3
2.667
8
0
0
0.00%
0.00%
0.00%
0
0
0
600
8
0
3
2.667
8
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 75 of 114
December 2016

-------
E.5-CL with OT
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
1,788,141
51,455
9,134,128
0.196
1,788,141
17,389
97,278
2.88%
0.97%
5.44%
51,455
17,389
97,278
1,788,141
11,072
9,134,128
0.196
1,788,141
0
17,389
0.62%
0.00%
0.97%
11,072
0
17,389
1,788,141
98
9,134,128
0.196
1,788,141
0
0
0.01%
0.00%
0.00%
98
0
0
1,788,141
0
9,134,128
0.196
1,788,141
0
0
0.00%
0.00%
0.00%
0
0
0
1,788,141
0
9,134,128
0.196
1,788,141
0
0
0.00%
0.00%
0.00%
0
0
0
1,788,141
0
9,134,128
0.196
1,788,141
0
0
0.00%
0.00%
0.00%
0
0
0
1,788,141
0
9,134,128
0.196
1,788,141
0
0
0.00%
0.00%
0.00%
0
0
0
1,788,141
0
9,134,128
0.196
1,788,141
0
0
0.00%
0.00%
0.00%
0
0
0
1,788,141
0
9,134,128
0.196
1,788,141
0
0
0.00%
0.00%
0.00%
0
0
0
1,388,873
17,128
7,668,042
0.181
1,388,873
0
33,334
1.23%
0.00%
2.40%
17,128
0
33,334
1,388,873
0
7,668,042
0.181
1,388,873
0
0
0.00%
0.00%
0.00%
0
0
0
1,388,873
0
7,668,042
0.181
1,388,873
0
0
0.00%
0.00%
0.00%
0
0
0
1,388,873
0
7,668,042
0.181
1,388,873
0
0
0.00%
0.00%
0.00%
0
0
0
1,388,873
0
7,668,042
0.181
1,388,873
0
0
0.00%
0.00%
0.00%
0
0
0
1,388,873
0
7,668,042
0.181
1,388,873
0
0
0.00%
0.00%
0.00%
0
0
0
1,388,873
0
7,668,042
0.181
1,388,873
0
0
0.00%
0.00%
0.00%
0
0
0
1,388,873
0
7,668,042
0.181
1,388,873
0
0
0.00%
0.00%
0.00%
0
0
0
1,388,873
0
7,668,042
0.181
1,388,873
0
0
0.00%
0.00%
0.00%
0
0
0
203,913
1,457
1,151,288
0.177
203,913
0
11,778
0.71%
0.00%
5.78%
1,457
0
11,778
203,913
0
1,151,288
0.177
203,913
0
0
0.00%
0.00%
0.00%
0
0
0
203,913
0
1,151,288
0.177
203,913
0
0
0.00%
0.00%
0.00%
0
0
0
203,913
0
1,151,288
0.177
203,913
0
0
0.00%
0.00%
0.00%
0
0
0
203,913
0
1,151,288
0.177
203,913
0
0
0.00%
0.00%
0.00%
0
0
0
203,913
0
1,151,288
0.177
203,913
0
0
0.00%
0.00%
0.00%
0
0
0
203,913
0
1,151,288
0.177
203,913
0
0
0.00%
0.00%
0.00%
0
0
0
203,913
0
1,151,288
0.177
203,913
0
0
0.00%
0.00%
0.00%
0
0
0
203,913
0
1,151,288
0.177
203,913
0
0
0.00%
0.00%
0.00%
0
0
0
195,356
32,869
314,798
0.621
195,356
17,389
52,167
16.83%
8.90%
26.70%
32,869
17,389
52,167
195,356
11,072
314,798
0.621
195,356
0
17,389
5.67%
0.00%
8.90%
11,072
0
17,389
195,356
98
314,798
0.621
195,356
0
0
0.05%
0.00%
0.00%
98
0
0
195,356
0
314,798
0.621
195,356
0
0
0.00%
0.00%
0.00%
0
0
0
195,356
0
314,798
0.621
195,356
0
0
0.00%
0.00%
0.00%
0
0
0
195,356
0
314,798
0.621
195,356
0
0
0.00%
0.00%
0.00%
0
0
0
195,356
0
314,798
0.621
195,356
0
0
0.00%
0.00%
0.00%
0
0
0
195,356
0
314,798
0.621
195,356
0
0
0.00%
0.00%
0.00%
0
0
0
195,356
0
314,798
0.621
195,356
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 76 of 114
December 2016

-------
E.5-CL with OT







90% CI on Number of UCMR 2 MRs

90% CI on Percentage of MRs with
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
Predicted Mean
National #
MR Ratio
National Number
with Predicted Mean Exceeding
Threshold
MRs with
Predicted Mean
Exceeding
Predicted Mean Exceeding
Threshold - National Extrapolation
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
14
5
13
1.077
14
3
9
38.56%
21.43%
64.29%
5
3
9

2
14
2
13
1.077
14
0
4
12.40%
0.00%
28.57%
2
0
4

6
14
0
13
1.077
14
0
0
0.20%
0.00%
0.00%
0
0
0

10
14
0
13
1.077
14
0
0
0.00%
0.00%
0.00%
0
0
0
All MRs Only
20
14
0
13
1.077
14
0
0
0.00%
0.00%
0.00%
0
0
0

60
14
0
13
1.077
14
0
0
0.00%
0.00%
0.00%
0
0
0

100
14
0
13
1.077
14
0
0
0.00%
0.00%
0.00%
0
0
0

200
14
0
13
1.077
14
0
0
0.00%
0.00%
0.00%
0
0
0

600
14
0

1.077

0
0
0.00%
0.00%
0.00%
0
0
0

0.6

1
6
0.667
4

3
35.44%
25.00%
75.00%
1

3

2
4
0
6
0.667
4
0
1
4.96%
0.00%
25.00%
0
0
1

6
4
0
6
0.667
4
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
4
0
6
0.667
4
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
20
4
0
6
0.667
4
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
4
0
6
0.667
4
0
0
0.00%
0.00%
0.00%
0
0
0

100
4
0
6
0.667
4
0
0
0.00%
0.00%
0.00%
0
0
0

200
4
0
6
0.667
4
0
0
0.00%
0.00%
0.00%
0
0
0

600
4
0
6
0.667
4
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
3
0
4
0.750
3
0
1
7.49%
0.00%
33.33%
0
0
1

2
3
0
4
0.750
3
0
0
0.25%
0.00%
0.00%
0
0
0

6
3
0
4
0.750
3
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
3
0
4
0.750
3
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
3
0
4
0.750
3
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
3
0
4
0.750
3
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
0
4
0.750
3
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
0
4
0.750
3
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
0
4
0.750
3
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
7
4
3
2.333
7
2
5
53.67%
28.57%
71.43%
4
2
5

2
7
2
3
2.333
7
0
3
21.86%
0.00%
42.86%
2
0
3

6
7
0
3
2.333
7
0
0
0.40%
0.00%
0.00%
0
0
0
MRs Only at
10
7
0
3
2.333
7
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
7
0
3
2.333
7
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
7
0
3
2.333
7
0
0
0.00%
0.00%
0.00%
0
0
0

100
7
0
3
2.333
7
0
0
0.00%
0.00%
0.00%
0
0
0

200
7
0
3
2.333
7
0
0
0.00%
0.00%
0.00%
0
0
0

600
7
0
3
2.333
7
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 77 of 114
December 2016

-------
E.5-CL with OT
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
1,555,911
276,890
9,134,128
0.170
1,555,911
68,111
1,319,450
17.80%
4.38%
84.80%
276,890
68,111
1,319,450
1,555,911
33,542
9,134,128
0.170
1,555,911
0
85,500
2.16%
0.00%
5.50%
33,542
0
85,500
1,555,911
312
9,134,128
0.170
1,555,911
0
0
0.02%
0.00%
0.00%
312
0
0
1,555,911
0
9,134,128
0.170
1,555,911
0
0
0.00%
0.00%
0.00%
0
0
0
1,555,911
0
9,134,128
0.170
1,555,911
0
0
0.00%
0.00%
0.00%
0
0
0
1,555,911
0
9,134,128
0.170
1,555,911
0
0
0.00%
0.00%
0.00%
0
0
0
1,555,911
0
9,134,128
0.170
1,555,911
0
0
0.00%
0.00%
0.00%
0
0
0
1,555,911
0
9,134,128
0.170
1,555,911
0
0
0.00%
0.00%
0.00%
0
0
0
1,555,911
0
9,134,128
0.170
1,555,911
0
0
0.00%
0.00%
0.00%
0
0
0
1,355,539
204,263
7,668,042
0.177
1,355,539
33,334
1,188,198
15.07%
2.46%
87.66%
204,263
33,334
1,188,198
1,355,539
6,860
7,668,042
0.177
1,355,539
0
33,334
0.51%
0.00%
2.46%
6,860
0
33,334
1,355,539
0
7,668,042
0.177
1,355,539
0
0
0.00%
0.00%
0.00%
0
0
0
1,355,539
0
7,668,042
0.177
1,355,539
0
0
0.00%
0.00%
0.00%
0
0
0
1,355,539
0
7,668,042
0.177
1,355,539
0
0
0.00%
0.00%
0.00%
0
0
0
1,355,539
0
7,668,042
0.177
1,355,539
0
0
0.00%
0.00%
0.00%
0
0
0
1,355,539
0
7,668,042
0.177
1,355,539
0
0
0.00%
0.00%
0.00%
0
0
0
1,355,539
0
7,668,042
0.177
1,355,539
0
0
0.00%
0.00%
0.00%
0
0
0
1,355,539
0
7,668,042
0.177
1,355,539
0
0
0.00%
0.00%
0.00%
0
0
0
51,935
4,014
1,151,288
0.045
51,935
0
28,363
7.73%
0.00%
54.61%
4,014
0
28,363
51,935
88
1,151,288
0.045
51,935
0
0
0.17%
0.00%
0.00%
88
0
0
51,935
0
1,151,288
0.045
51,935
0
0
0.00%
0.00%
0.00%
0
0
0
51,935
0
1,151,288
0.045
51,935
0
0
0.00%
0.00%
0.00%
0
0
0
51,935
0
1,151,288
0.045
51,935
0
0
0.00%
0.00%
0.00%
0
0
0
51,935
0
1,151,288
0.045
51,935
0
0
0.00%
0.00%
0.00%
0
0
0
51,935
0
1,151,288
0.045
51,935
0
0
0.00%
0.00%
0.00%
0
0
0
51,935
0
1,151,288
0.045
51,935
0
0
0.00%
0.00%
0.00%
0
0
0
51,935
0
1,151,288
0.045
51,935
0
0
0.00%
0.00%
0.00%
0
0
0
148,437
68,613
314,798
0.472
148,437
34,778
102,889
46.22%
23.43%
69.32%
68,613
34,778
102,889
148,437
26,594
314,798
0.472
148,437
0
52,167
17.92%
0.00%
35.14%
26,594
0
52,167
148,437
312
314,798
0.472
148,437
0
0
0.21%
0.00%
0.00%
312
0
0
148,437
0
314,798
0.472
148,437
0
0
0.00%
0.00%
0.00%
0
0
0
148,437
0
314,798
0.472
148,437
0
0
0.00%
0.00%
0.00%
0
0
0
148,437
0
314,798
0.472
148,437
0
0
0.00%
0.00%
0.00%
0
0
0
148,437
0
314,798
0.472
148,437
0
0
0.00%
0.00%
0.00%
0
0
0
148,437
0
314,798
0.472
148,437
0
0
0.00%
0.00%
0.00%
0
0
0
148,437
0
314,798
0.472
148,437
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 78 of 114
December 2016

-------
E.5-CL with OT







90% CI on Number of UCMR 2 EPs
Percentage of
90% CI on Percentage of EPs with
Total Number of
90% CI on Number of EPs with







with Predicted Mean Exceeding

Predicted Mean Exceeding
Mean Exceeding Threshold -
Source Water Type
Threshold
Total
Number of
UCMR2 EPs
UCMR 2 EPs with
Predicted Mean
Exceeding
National #
EP Ratio
National Number
Threshold
Predicted Mean
Exceeding
Threshold -
Threshold - National Extrapolation
EPs with Mean
Exceeding
National Extrapolation
(ng/L)
Systems
of EPs




Threshold -
National
Extrapolation





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
38
2
110
1.640
181

8
6.44%
2.63%
21.05%
7

42

2
38
1
110
1.640
181
0
1
1.71%
0.00%
2.63%
1
0
1

6
38
0
110
1.640
181
0
0
0.01%
0.00%
0.00%
0
0
0

10
38
0
110
1.640
181
0
0
0.00%
0.00%
0.00%
0
0
0
All EPs Only
20
38
0
110
1.640
181
0
0
0.00%
0.00%
0.00%
0
0
0

60
38
0
110
1.640
181
0
0
0.00%
0.00%
0.00%
0
0
0

100
38
0
110
1.640
181
0
0
0.00%
0.00%
0.00%
0
0
0

200
38
0
110
1.640
181
0
0
0.00%
0.00%
0.00%
0
0
0

600
38
0
110
1.640
181
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
7
0
21
0.952
20
0
1
1.98%
0.00%
14.29%
1
0
1

2
7
0
21
0.952
20
0
0
0.00%
0.00%
0.00%
0
0
0

6
7
0
21
0.952
20
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
10
7
0
21
0.952
20
0
0
0.00%
0.00%
0.00%
0
0
0
20
7
0
21
0.952
20
0
0
0.00%
0.00%
0.00%
0
0
0
60
7
0
21
0.952
20
0
0
0.00%
0.00%
0.00%
0
0
0

100
7
0
21
0.952
20
0
0
0.00%
0.00%
0.00%
0
0
0

200
7
0
21
0.952
20
0
0
0.00%
0.00%
0.00%
0
0
0

600
7
0
21
0.952
20
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
19
0
44
1.547
67
0
3
2.00%
0.00%
15.79%
2
0
17

2
19
0
44
1.547
67
0
0
0.05%
0.00%
0.00%
0
0
0

6
19
0
44
1.547
67
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
10
19
0
44
1.547
67
0
0
0.00%
0.00%
0.00%
0
0
0
20
19
0
44
1.547
67
0
0
0.00%
0.00%
0.00%
0
0
0
60
19
0
44
1.547
67
0
0
0.00%
0.00%
0.00%
0
0
0

100
19
0
44
1.547
67
0
0
0.00%
0.00%
0.00%
0
0
0

200
19
0
44
1.547
67
0
0
0.00%
0.00%
0.00%
0
0
0

600
19
0
44
1.547
67
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
12
2
46
2.044
94

4
16.06%
8.33%
33.33%
4

24

2
12
1
46
2.044
94
0
1
5.32%
0.00%
8.33%
1
0
1

6
12
0
46
2.044
94
0
0
0.05%
0.00%
0.00%
0
0
0
EPs Only at
10
12
0
46
2.044
94
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
12
0
46
2.044
94
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
12
0
46
2.044
94
0
0
0.00%
0.00%
0.00%
0
0
0

100
12
0
46
2.044
94
0
0
0.00%
0.00%
0.00%
0
0
0

200
12
0
46
2.044
94
0
0
0.00%
0.00%
0.00%
0
0
0

600
12
0
46
2.044
94
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 79 of 114
December 2016

-------
E.5-CL with OT
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
1,889,175
53,967
11,815,422
0.234
2,766,023
17,389
112,837
2.86%
0.92%
5.97%
74,581
17,389
288,240
1,889,175
11,117
11,815,422
0.234
2,766,023
0
17,389
0.59%
0.00%
0.92%
11,570
0
17,389
1,889,175
98
11,815,422
0.234
2,766,023
0
0
0.01%
0.00%
0.00%
98
0
0
1,889,175
0
11,815,422
0.234
2,766,023
0
0
0.00%
0.00%
0.00%
0
0
0
1,889,175
0
11,815,422
0.234
2,766,023
0
0
0.00%
0.00%
0.00%
0
0
0
1,889,175
0
11,815,422
0.234
2,766,023
0
0
0.00%
0.00%
0.00%
0
0
0
1,889,175
0
11,815,422
0.234
2,766,023
0
0
0.00%
0.00%
0.00%
0
0
0
1,889,175
0
11,815,422
0.234
2,766,023
0
0
0.00%
0.00%
0.00%
0
0
0
1,889,175
0
11,815,422
0.234
2,766,023
0
0
0.00%
0.00%
0.00%
0
0
0
1,412,693
17,722
7,894,773
0.184
1,451,221
0
33,334
1.25%
0.00%
2.36%
18,678
0
33,334
1,412,693
0
7,894,773
0.184
1,451,221
0
0
0.00%
0.00%
0.00%
0
0
0
1,412,693
0
7,894,773
0.184
1,451,221
0
0
0.00%
0.00%
0.00%
0
0
0
1,412,693
0
7,894,773
0.184
1,451,221
0
0
0.00%
0.00%
0.00%
0
0
0
1,412,693
0
7,894,773
0.184
1,451,221
0
0
0.00%
0.00%
0.00%
0
0
0
1,412,693
0
7,894,773
0.184
1,451,221
0
0
0.00%
0.00%
0.00%
0
0
0
1,412,693
0
7,894,773
0.184
1,451,221
0
0
0.00%
0.00%
0.00%
0
0
0
1,412,693
0
7,894,773
0.184
1,451,221
0
0
0.00%
0.00%
0.00%
0
0
0
1,412,693
0
7,894,773
0.184
1,451,221
0
0
0.00%
0.00%
0.00%
0
0
0
229,323
2,236
2,174,064
0.171
371,010
0
16,075
0.98%
0.00%
7.01%
6,581
0
40,037
229,323
20
2,174,064
0.171
371,010
0
0
0.01%
0.00%
0.00%
132
0
0
229,323
0
2,174,064
0.171
371,010
0
0
0.00%
0.00%
0.00%
0
0
0
229,323
0
2,174,064
0.171
371,010
0
0
0.00%
0.00%
0.00%
0
0
0
229,323
0
2,174,064
0.171
371,010
0
0
0.00%
0.00%
0.00%
0
0
0
229,323
0
2,174,064
0.171
371,010
0
0
0.00%
0.00%
0.00%
0
0
0
229,323
0
2,174,064
0.171
371,010
0
0
0.00%
0.00%
0.00%
0
0
0
229,323
0
2,174,064
0.171
371,010
0
0
0.00%
0.00%
0.00%
0
0
0
229,323
0
2,174,064
0.171
371,010
0
0
0.00%
0.00%
0.00%
0
0
0
247,159
34,008
1,746,585
0.540
943,793
17,389
63,428
13.76%
7.04%
25.66%
49,323
17,389
214,868
247,159
11,097
1,746,585
0.540
943,793
0
17,389
4.49%
0.00%
7.04%
11,437
0
17,389
247,159
98
1,746,585
0.540
943,793
0
0
0.04%
0.00%
0.00%
98
0
0
247,159
0
1,746,585
0.540
943,793
0
0
0.00%
0.00%
0.00%
0
0
0
247,159
0
1,746,585
0.540
943,793
0
0
0.00%
0.00%
0.00%
0
0
0
247,159
0
1,746,585
0.540
943,793
0
0
0.00%
0.00%
0.00%
0
0
0
247,159
0
1,746,585
0.540
943,793
0
0
0.00%
0.00%
0.00%
0
0
0
247,159
0
1,746,585
0.540
943,793
0
0
0.00%
0.00%
0.00%
0
0
0
247,159
0
1,746,585
0.540
943,793
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 80 of 114
December 2016

-------
E.5-CL with OT







90% CI on Number of UCMR 2 MRs

90% CI on Percentage of MRs with
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
Predicted Mean
National #
MR Ratio
National Number
with Predicted Mean Exceeding
Threshold
MRs with
Predicted Mean
Exceeding
Predicted Mean Exceeding
Threshold - National Extrapolation
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
26
6
110
1.224
135
3
14
24.88%
11.54%
53.85%
19
3
61

2
26
2
110
1.224
135
0
4
6.79%
0.00%
15.38%
2
0
4

6
26
0
110
1.224
135
0
0
0.11%
0.00%
0.00%
0
0
0

10
26
0
110
1.224
135
0
0
0.00%
0.00%
0.00%
0
0
0
All MRs Only
20
26
0
110
1.224
135
0
0
0.00%
0.00%
0.00%
0
0
0

60
26
0
110
1.224
135
0
0
0.00%
0.00%
0.00%
0
0
0

100
26
0
110
1.224
135
0
0
0.00%
0.00%
0.00%
0
0
0

200
26
0
110
1.224
135
0
0
0.00%
0.00%
0.00%
0
0
0

600
26
0
110
1.224
135
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
6
2
21
0.905
19

5
29.53%
16.67%
83.33%
4

18

2
6
0
21
0.905
19
0
1
3.40%
0.00%
16.67%
0
0
1

6
6
0
21
0.905
19
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
6
0
21
0.905
19
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
20
6
0
21
0.905
19
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
6
0
21
0.905
19
0
0
0.00%
0.00%
0.00%
0
0
0

100
6
0
21
0.905
19
0
0
0.00%
0.00%
0.00%
0
0
0

200
6
0
21
0.905
19
0
0
0.00%
0.00%
0.00%
0
0
0

600
6
0
21
0.905
19
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
11
1
44
1.522
66
0
3
5.26%
0.00%
27.27%
3
0
17

2
11
0
44
1.522
66
0
0
0.14%
0.00%
0.00%
0
0
0

6
11
0
44
1.522
66
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
11
0
44
1.522
66
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
11
0
44
1.522
66
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
11
0
44
1.522
66
0
0
0.00%
0.00%
0.00%
0
0
0

100
11
0
44
1.522
66
0
0
0.00%
0.00%
0.00%
0
0
0

200
11
0
44
1.522
66
0
0
0.00%
0.00%
0.00%
0
0
0

600
11
0
44
1.522
66
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
9
4
46
1.087
50
2
6
45.76%
22.22%
66.67%
11
2
26

2
9
2
46
1.087
50
0
3
17.19%
0.00%
33.33%
2
0
3

6
9
0
46
1.087
50
0
0
0.31%
0.00%
0.00%
0
0
0
MRs Only at
10
9
0
46
1.087
50
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
9
0
46
1.087
50
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
9
0
46
1.087
50
0
0
0.00%
0.00%
0.00%
0
0
0

100
9
0
46
1.087
50
0
0
0.00%
0.00%
0.00%
0
0
0

200
9
0
46
1.087
50
0
0
0.00%
0.00%
0.00%
0
0
0

600
9
0
46
1.087
50
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 81 of 114
December 2016

-------
E.5-CL with OT
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
1,631,968
287,056
11,815,422
0.183
2,156,795
68,111
1,374,285
17.59%
4.17%
84.21%
364,873
68,111
1,692,127
1,631,968
33,800
11,815,422
0.183
2,156,795
0
85,500
2.07%
0.00%
5.24%
36,895
0
85,500
1,631,968
312
11,815,422
0.183
2,156,795
0
0
0.02%
0.00%
0.00%
312
0
0
1,631,968
0
11,815,422
0.183
2,156,795
0
0
0.00%
0.00%
0.00%
0
0
0
1,631,968
0
11,815,422
0.183
2,156,795
0
0
0.00%
0.00%
0.00%
0
0
0
1,631,968
0
11,815,422
0.183
2,156,795
0
0
0.00%
0.00%
0.00%
0
0
0
1,631,968
0
11,815,422
0.183
2,156,795
0
0
0.00%
0.00%
0.00%
0
0
0
1,631,968
0
11,815,422
0.183
2,156,795
0
0
0.00%
0.00%
0.00%
0
0
0
1,631,968
0
11,815,422
0.183
2,156,795
0
0
0.00%
0.00%
0.00%
0
0
0
1,379,359
207,993
7,894,773
0.180
1,417,887
33,334
1,212,019
15.08%
2.42%
87.87%
213,996
33,334
1,250,546
1,379,359
6,885
7,894,773
0.180
1,417,887
0
33,334
0.50%
0.00%
2.42%
6,924
0
33,334
1,379,359
0
7,894,773
0.180
1,417,887
0
0
0.00%
0.00%
0.00%
0
0
0
1,379,359
0
7,894,773
0.180
1,417,887
0
0
0.00%
0.00%
0.00%
0
0
0
1,379,359
0
7,894,773
0.180
1,417,887
0
0
0.00%
0.00%
0.00%
0
0
0
1,379,359
0
7,894,773
0.180
1,417,887
0
0
0.00%
0.00%
0.00%
0
0
0
1,379,359
0
7,894,773
0.180
1,417,887
0
0
0.00%
0.00%
0.00%
0
0
0
1,379,359
0
7,894,773
0.180
1,417,887
0
0
0.00%
0.00%
0.00%
0
0
0
1,379,359
0
7,894,773
0.180
1,417,887
0
0
0.00%
0.00%
0.00%
0
0
0
79,396
5,887
2,174,064
0.107
232,524
0
45,863
7.41%
0.00%
57.76%
16,329
0
143,446
79,396
97
2,174,064
0.107
232,524
0
0
0.12%
0.00%
0.00%
148
0
0
79,396
0
2,174,064
0.107
232,524
0
0
0.00%
0.00%
0.00%
0
0
0
79,396
0
2,174,064
0.107
232,524
0
0
0.00%
0.00%
0.00%
0
0
0
79,396
0
2,174,064
0.107
232,524
0
0
0.00%
0.00%
0.00%
0
0
0
79,396
0
2,174,064
0.107
232,524
0
0
0.00%
0.00%
0.00%
0
0
0
79,396
0
2,174,064
0.107
232,524
0
0
0.00%
0.00%
0.00%
0
0
0
79,396
0
2,174,064
0.107
232,524
0
0
0.00%
0.00%
0.00%
0
0
0
79,396
0
2,174,064
0.107
232,524
0
0
0.00%
0.00%
0.00%
0
0
0
173,213
73,176
1,746,585
0.290
506,384
34,778
116,403
42.25%
20.08%
67.20%
134,547
34,778
298,134
173,213
26,817
1,746,585
0.290
506,384
0
52,167
15.48%
0.00%
30.12%
29,824
0
52,167
173,213
312
1,746,585
0.290
506,384
0
0
0.18%
0.00%
0.00%
312
0
0
173,213
0
1,746,585
0.290
506,384
0
0
0.00%
0.00%
0.00%
0
0
0
173,213
0
1,746,585
0.290
506,384
0
0
0.00%
0.00%
0.00%
0
0
0
173,213
0
1,746,585
0.290
506,384
0
0
0.00%
0.00%
0.00%
0
0
0
173,213
0
1,746,585
0.290
506,384
0
0
0.00%
0.00%
0.00%
0
0
0
173,213
0
1,746,585
0.290
506,384
0
0
0.00%
0.00%
0.00%
0
0
0
173,213
0
1,746,585
0.290
506,384
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 82 of 114
December 2016

-------
E.6 - OT Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2 EPs
Number of
UCMR 2 EPs with
Predicted Mean
Exceeding
Threshold
National #
Systems
EP Ratio
National Number
of EPs
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All EPs Only
0.6
1
0
9
1.000
9
0
1
18.16%
0.00%
100.00%
2
0
9
2
1
0
9
1.000
9
0
0
0.37%
0.00%
0.00%
0
0
0
6
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
10
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
20
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
60
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
1
0
9
1.000
9
0
1
18.16%
0.00%
100.00%
2
0
9
2
1
0
9
1.000
9
0
0
0.37%
0.00%
0.00%
0
0
0
6
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
10
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
20
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
60
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
100
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
200
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
600
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 83 of 114
December 2016

-------
E.6 - OT Only
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent ot
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Fxtranolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
20
4
22,661
0.500
11,331
0
20
18.16%
0.00%
100.00%
2,058
0
11,331
20
0
22,661
0.500
11,331
0
0
0.37%
0.00%
0.00%
42
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
4
22,661
0.500
11,331
0
20
18.16%
0.00%
100.00%
2,058
0
11,331
20
0
22,661
0.500
11,331
0
0
0.37%
0.00%
0.00%
42
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 84 of 114
December 2016

-------
E.6 - OT Only
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
Predicted Mean
Exceeding
National #
MR Ratio
National Number
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
Threshold -
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)

0.6
1
0
9
1.000
9
0
1
39.89%
0.00%
100.00%
4
0
9

2
1
0
9
1.000
9
0
0
1.69%
0.00%
0.00%
0
0
0

6
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

10
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
All MRs Only
20
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

60
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
0
9
1.000
9
0
1
39.89%
0.00%
100.00%
4
0
9

2
1
0
9
1.000
9
0
0
1.69%
0.00%
0.00%
0
0
0

6
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
20
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
0
9
1.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 85 of 114
December 2016

-------
E.6 - OT Only
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent ot
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Fxtranolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
20
8
22,661
0.500
11,331
0
20
39.89%
0.00%
100.00%
4,520
0
11,331
20
0
22,661
0.500
11,331
0
0
1.69%
0.00%
0.00%
191
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
8
22,661
0.500
11,331
0
20
39.89%
0.00%
100.00%
4,520
0
11,331
20
0
22,661
0.500
11,331
0
0
1.69%
0.00%
0.00%
191
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
22,661
0.500
11,331
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 86 of 114
December 2016

-------
E.6 - OT Only
Source Water Type
Threshold
Total
Number of
UCMR2 EPs
Number of
UCMR 2 EPs with
Predicted Mean
Exceeding
Threshold
National #
EP Ratio
National Number
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
Systems
of EPs
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)

0.6
8
2
36
1.660
60

4
18.91%
12.50%
50.00%
10
6
28

2
8
1
36
1.660
60

1
12.76%
12.50%
12.50%
6
6
6

6
8
1
36
1.660
60
0
1
8.73%
0.00%
12.50%
4
0
6

10
8
0
36
1.660
60
0
1
2.41%
0.00%
12.50%
1
0
6
All EPs Only
20
8
0
36
1.660
60
0
0
0.09%
0.00%
0.00%
0
0
0

60
8
0
36
1.660
60
0
0
0.00%
0.00%
0.00%
0
0
0

100
8
0
36
1.660
60
0
0
0.00%
0.00%
0.00%
0
0
0

200
8
0
36
1.660
60
0
0
0.00%
0.00%
0.00%
0
0
0

600
8
0
36
1.660
60
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
2
1
12
1.000
12

2
56.55%
50.00%
100.00%
7
6
12

2
2
1
12
1.000
12

1
50.09%
50.00%
50.00%
6
6
6

6
2
1
12
1.000
12
0
1
34.93%
0.00%
50.00%
4
0
6
EPs Only at Surface
Water Systems
10
2
0
12
1.000
12
0
1
9.64%
0.00%
50.00%
1
0
6
20
2
0
12
1.000
12
0
0
0.37%
0.00%
0.00%
0
0
0
60
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

100
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

200
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

600
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
6
0
24
2.000
47
0
2
6.37%
0.00%
33.33%
3
0
16

2
6
0
24
2.000
47
0
0
0.31%
0.00%
0.00%
0
0
0

6
6
0
24
2.000
47
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
10
6
0
24
2.000
47
0
0
0.00%
0.00%
0.00%
0
0
0
20
6
0
24
2.000
47
0
0
0.00%
0.00%
0.00%
0
0
0
60
6
0
24
2.000
47
0
0
0.00%
0.00%
0.00%
0
0
0

100
6
0
24
2.000
47
0
0
0.00%
0.00%
0.00%
0
0
0

200
6
0
24
2.000
47
0
0
0.00%
0.00%
0.00%
0
0
0

600
6
0
24
2.000
47
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 87 of 114
December 2016

-------
E.6 - OT Only
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent ot
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Fxtranolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
118,233
18,687
1,021,805
0.518
529,065
10,903
49,813
15.81%
9.22%
42.13%
169,029
137,741
311,235
118,233
11,292
1,021,805
0.518
529,065
10,903
10,903
9.55%
9.22%
9.22%
139,075
137,741
137,741
118,233
7,615
1,021,805
0.518
529,065
0
10,903
6.44%
0.00%
9.22%
96,213
0
137,741
118,233
2,103
1,021,805
0.518
529,065
0
10,903
1.78%
0.00%
9.22%
26,568
0
137,741
118,233
82
1,021,805
0.518
529,065
0
0
0.07%
0.00%
0.00%
1,032
0
0
118,233
0
1,021,805
0.518
529,065
0
0
0.00%
0.00%
0.00%
0
0
0
118,233
0
1,021,805
0.518
529,065
0
0
0.00%
0.00%
0.00%
0
0
0
118,233
0
1,021,805
0.518
529,065
0
0
0.00%
0.00%
0.00%
0
0
0
118,233
0
1,021,805
0.518
529,065
0
0
0.00%
0.00%
0.00%
0
0
0
16,153
11,591
408,139
0.500
204,070
10,903
16,153
71.76%
67.50%
100.00%
146,436
137,741
204,070
16,153
10,912
408,139
0.500
204,070
10,903
10,903
67.56%
67.50%
67.50%
137,866
137,741
137,741
16,153
7,615
408,139
0.500
204,070
0
10,903
47.15%
0.00%
67.50%
96,213
0
137,741
16,153
2,103
408,139
0.500
204,070
0
10,903
13.02%
0.00%
67.50%
26,568
0
137,741
16,153
82
408,139
0.500
204,070
0
0
0.51%
0.00%
0.00%
1,032
0
0
16,153
0
408,139
0.500
204,070
0
0
0.00%
0.00%
0.00%
0
0
0
16,153
0
408,139
0.500
204,070
0
0
0.00%
0.00%
0.00%
0
0
0
16,153
0
408,139
0.500
204,070
0
0
0.00%
0.00%
0.00%
0
0
0
16,153
0
408,139
0.500
204,070
0
0
0.00%
0.00%
0.00%
0
0
0
102,080
7,096
613,666
0.530
324,995
0
33,661
6.95%
0.00%
32.97%
22,592
0
107,166
102,080
380
613,666
0.530
324,995
0
0
0.37%
0.00%
0.00%
1,210
0
0
102,080
0
613,666
0.530
324,995
0
0
0.00%
0.00%
0.00%
0
0
0
102,080
0
613,666
0.530
324,995
0
0
0.00%
0.00%
0.00%
0
0
0
102,080
0
613,666
0.530
324,995
0
0
0.00%
0.00%
0.00%
0
0
0
102,080
0
613,666
0.530
324,995
0
0
0.00%
0.00%
0.00%
0
0
0
102,080
0
613,666
0.530
324,995
0
0
0.00%
0.00%
0.00%
0
0
0
102,080
0
613,666
0.530
324,995
0
0
0.00%
0.00%
0.00%
0
0
0
102,080
0
613,666
0.530
324,995
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 88 of 114
December 2016

-------
E.6 - OT Only
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
Predicted Mean
Exceeding
National #
MR Ratio
National Number
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
Threshold -
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)

0.6
7
3
36
1.440
52
2
5
43.95%
28.57%
71.43%
21
12
36

2
7
1
36
1.440
52

3
21.05%
14.29%
42.86%
9
6
20

6
7
1
36
1.440
52

1
14.26%
14.29%
14.29%
6
6
6

10
7
1
36
1.440
52
0
1
11.61%
0.00%
14.29%
5
0
6
All MRs Only
20
7
0
36
1.440
52
0
1
2.25%
0.00%
14.29%
1
0
6

60
7
0
36
1.440
52
0
0
0.00%
0.00%
0.00%
0
0
0

100
7
0
36
1.440
52
0
0
0.00%
0.00%
0.00%
0
0
0

200
7
0
36
1.440
52
0
0
0.00%
0.00%
0.00%
0
0
0

600
7
0
36
1.440
52
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
2
2
12
1.000
12
2
2
99.81%
100.00%
100.00%
12
12
12

2
2
1
12
1.000
12

2
68.63%
50.00%
100.00%
8
6
12

6
2
1
12
1.000
12

1
49.91%
50.00%
50.00%
6
6
6
MRs Only at
10
2
1
12
1.000
12
0
1
40.64%
0.00%
50.00%
5
0
6
Surface Water
20
2
0
12
1.000
12
0
1
7.87%
0.00%
50.00%
1
0
6
Systems
60
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

100
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

200
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

600
2
0
12
1.000
12
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
5
1
24
1.667
40
0
3
21.61%
0.00%
60.00%
9
0
24

2
5
0
24
1.667
40
0
1
2.02%
0.00%
20.00%
1
0
8

6
5
0
24
1.667
40
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
5
0
24
1.667
40
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
5
0
24
1.667
40
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
5
0
24
1.667
40
0
0
0.00%
0.00%
0.00%
0
0
0

100
5
0
24
1.667
40
0
0
0.00%
0.00%
0.00%
0
0
0

200
5
0
24
1.667
40
0
0
0.00%
0.00%
0.00%
0
0
0

600
5
0
24
1.667
40
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 89 of 114
December 2016

-------
E.6 - OT Only
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent ot
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Fxtranolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
116,181
37,971
1,021,805
0.511
522,533
16,153
81,618
32.68%
13.90%
70.25%
273,346
204,070
412,492
116,181
14,991
1,021,805
0.511
522,533
10,903
47,063
12.90%
9.38%
40.51%
169,248
137,741
302,480
116,181
10,882
1,021,805
0.511
522,533
10,903
10,903
9.37%
9.38%
9.38%
137,484
137,741
137,741
116,181
8,861
1,021,805
0.511
522,533
0
10,903
7.63%
0.00%
9.38%
111,947
0
137,741
116,181
1,715
1,021,805
0.511
522,533
0
10,903
1.48%
0.00%
9.38%
21,667
0
137,741
116,181
0
1,021,805
0.511
522,533
0
0
0.00%
0.00%
0.00%
0
0
0
116,181
0
1,021,805
0.511
522,533
0
0
0.00%
0.00%
0.00%
0
0
0
116,181
0
1,021,805
0.511
522,533
0
0
0.00%
0.00%
0.00%
0
0
0
116,181
0
1,021,805
0.511
522,533
0
0
0.00%
0.00%
0.00%
0
0
0
16,153
16,133
408,139
0.500
204,070
16,153
16,153
99.88%
100.00%
100.00%
203,821
204,070
204,070
16,153
12,859
408,139
0.500
204,070
10,903
16,153
79.61%
67.50%
100.00%
162,459
137,741
204,070
16,153
10,882
408,139
0.500
204,070
10,903
10,903
67.37%
67.50%
67.50%
137,484
137,741
137,741
16,153
8,861
408,139
0.500
204,070
0
10,903
54.86%
0.00%
67.50%
111,947
0
137,741
16,153
1,715
408,139
0.500
204,070
0
10,903
10.62%
0.00%
67.50%
21,667
0
137,741
16,153
0
408,139
0.500
204,070
0
0
0.00%
0.00%
0.00%
0
0
0
16,153
0
408,139
0.500
204,070
0
0
0.00%
0.00%
0.00%
0
0
0
16,153
0
408,139
0.500
204,070
0
0
0.00%
0.00%
0.00%
0
0
0
16,153
0
408,139
0.500
204,070
0
0
0.00%
0.00%
0.00%
0
0
0
100,029
21,838
613,666
0.519
318,463
0
65,465
21.83%
0.00%
65.45%
69,525
0
208,422
100,029
2,132
613,666
0.519
318,463
0
30,911
2.13%
0.00%
30.90%
6,789
0
98,410
100,029
0
613,666
0.519
318,463
0
0
0.00%
0.00%
0.00%
0
0
0
100,029
0
613,666
0.519
318,463
0
0
0.00%
0.00%
0.00%
0
0
0
100,029
0
613,666
0.519
318,463
0
0
0.00%
0.00%
0.00%
0
0
0
100,029
0
613,666
0.519
318,463
0
0
0.00%
0.00%
0.00%
0
0
0
100,029
0
613,666
0.519
318,463
0
0
0.00%
0.00%
0.00%
0
0
0
100,029
0
613,666
0.519
318,463
0
0
0.00%
0.00%
0.00%
0
0
0
100,029
0
613,666
0.519
318,463
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 90 of 114
December 2016

-------
E.6 - OT Only
Source Water Type
Threshold
Total
Number of
UCMR2 EPs
Number of
UCMR 2 EPs with
Predicted Mean
Exceeding
Threshold
National #
EP Ratio
National Number
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
Systems
of EPs
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
9
1
3
3.000
9
0
3
8.11%
0.00%
33.33%
1
0
3

2
9
0
3
3.000
9
0
0
0.40%
0.00%
0.00%
0
0
0

6
9
0
3
3.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

10
9
0
3
3.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
All EPs Only
20
9
0
3
3.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

60
9
0
3
3.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

100
9
0
3
3.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

200
9
0
3
3.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

600
9
0
3
3.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
3
0
1
3.000
3
0
1
10.86%
0.00%
33.33%
0
0
1

2
3
0
1
3.000
3
0
0
0.44%
0.00%
0.00%
0
0
0

6
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
10
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
20
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
60
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
3
0
1
3.000
3
0
1
6.93%
0.00%
33.33%
0
0
1

2
3
0
1
3.000
3
0
0
0.50%
0.00%
0.00%
0
0
0

6
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
10
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
20
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
60
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
3
0
1
3.000
3
0
1
6.55%
0.00%
33.33%
0
0
1

2
3
0
1
3.000
3
0
0
0.25%
0.00%
0.00%
0
0
0

6
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
10
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 91 of 114
December 2016

-------
E.6 - OT Only
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent ot
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Fxtranolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
578,899
55,342
701,961
0.825
578,899
0
286,822
9.56%
0.00%
49.55%
55,342
0
286,822
578,899
2,298
701,961
0.825
578,899
0
0
0.40%
0.00%
0.00%
2,298
0
0
578,899
0
701,961
0.825
578,899
0
0
0.00%
0.00%
0.00%
0
0
0
578,899
0
701,961
0.825
578,899
0
0
0.00%
0.00%
0.00%
0
0
0
578,899
0
701,961
0.825
578,899
0
0
0.00%
0.00%
0.00%
0
0
0
578,899
0
701,961
0.825
578,899
0
0
0.00%
0.00%
0.00%
0
0
0
578,899
0
701,961
0.825
578,899
0
0
0.00%
0.00%
0.00%
0
0
0
578,899
0
701,961
0.825
578,899
0
0
0.00%
0.00%
0.00%
0
0
0
578,899
0
701,961
0.825
578,899
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
44,501
445,327
0.928
413,217
0
222,664
10.77%
0.00%
53.89%
44,501
0
222,664
413,217
1,679
445,327
0.928
413,217
0
0
0.41%
0.00%
0.00%
1,679
0
0
413,217
0
445,327
0.928
413,217
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
0
445,327
0.928
413,217
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
0
445,327
0.928
413,217
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
0
445,327
0.928
413,217
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
0
445,327
0.928
413,217
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
0
445,327
0.928
413,217
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
0
445,327
0.928
413,217
0
0
0.00%
0.00%
0.00%
0
0
0
88,922
5,810
154,288
0.576
88,922
0
38,572
6.53%
0.00%
43.38%
5,810
0
38,572
88,922
427
154,288
0.576
88,922
0
0
0.48%
0.00%
0.00%
427
0
0
88,922
0
154,288
0.576
88,922
0
0
0.00%
0.00%
0.00%
0
0
0
88,922
0
154,288
0.576
88,922
0
0
0.00%
0.00%
0.00%
0
0
0
88,922
0
154,288
0.576
88,922
0
0
0.00%
0.00%
0.00%
0
0
0
88,922
0
154,288
0.576
88,922
0
0
0.00%
0.00%
0.00%
0
0
0
88,922
0
154,288
0.576
88,922
0
0
0.00%
0.00%
0.00%
0
0
0
88,922
0
154,288
0.576
88,922
0
0
0.00%
0.00%
0.00%
0
0
0
88,922
0
154,288
0.576
88,922
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
5,031
102,346
0.750
76,760
0
25,587
6.55%
0.00%
33.33%
5,031
0
25,587
76,760
192
102,346
0.750
76,760
0
0
0.25%
0.00%
0.00%
192
0
0
76,760
0
102,346
0.750
76,760
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
0
102,346
0.750
76,760
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
0
102,346
0.750
76,760
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
0
102,346
0.750
76,760
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
0
102,346
0.750
76,760
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
0
102,346
0.750
76,760
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
0
102,346
0.750
76,760
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 92 of 114
December 2016

-------
E.6 - OT Only
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
Predicted Mean
Exceeding
National #
MR Ratio
National Number
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
Threshold -
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
6
2
3
2.000
6

6
40.70%
16.67%
100.00%
2

6

2
6
0
3
2.000
6
0
1
8.30%
0.00%
16.67%
0
0
1

6
6
0
3
2.000
6
0
0
0.00%
0.00%
0.00%
0
0
0

10
6
0
3
2.000
6
0
0
0.00%
0.00%
0.00%
0
0
0
All MRs Only
20
6
0
3
2.000
6
0
0
0.00%
0.00%
0.00%
0
0
0

60
6
0
3
2.000
6
0
0
0.00%
0.00%
0.00%
0
0
0

100
6
0
3
2.000
6
0
0
0.00%
0.00%
0.00%
0
0
0

200
6
0
3
2.000
6
0
0
0.00%
0.00%
0.00%
0
0
0

600
6
0
3
2.000
6
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
3
1
1
3.000
3
0
3
36.45%
0.00%
100.00%
1
0
3

2
3
0
1
3.000
3
0
0
1.62%
0.00%
0.00%
0
0
0

6
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
20
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
2
0
1
2.000
2
0
2
17.42%
0.00%
100.00%
0
0
2

2
2
0
1
2.000
2
0
0
0.75%
0.00%
0.00%
0
0
0

6
2
0
1
2.000
2
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
2
0
1
2.000
2
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
2
0
1
2.000
2
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
2
0
1
2.000
2
0
0
0.00%
0.00%
0.00%
0
0
0

100
2
0
1
2.000
2
0
0
0.00%
0.00%
0.00%
0
0
0

200
2
0
1
2.000
2
0
0
0.00%
0.00%
0.00%
0
0
0

600
2
0
1
2.000
2
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
1
1
1.000
1

1
100.00%
100.00%
100.00%
1

1

2
1
0
1
1.000
1
0
1
43.45%
0.00%
100.00%
0
0
1

6
1
0
1
1.000
1
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
1
0
1
1.000
1
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
1
0
1
1.000
1
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
1
0
1
1.000
1
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
0
1
1.000
1
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
0
1
1.000
1
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
0
1
1.000
1
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 93 of 114
December 2016

-------
E.6 - OT Only
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent ot
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Fxtranolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
515,948
190,073
701,961
0.735
515,948
25,587
515,948
36.84%
4.96%
100.00%
190,073
25,587
515,948
515,948
18,241
701,961
0.735
515,948
0
25,587
3.54%
0.00%
4.96%
18,241
0
25,587
515,948
0
701,961
0.735
515,948
0
0
0.00%
0.00%
0.00%
0
0
0
515,948
0
701,961
0.735
515,948
0
0
0.00%
0.00%
0.00%
0
0
0
515,948
0
701,961
0.735
515,948
0
0
0.00%
0.00%
0.00%
0
0
0
515,948
0
701,961
0.735
515,948
0
0
0.00%
0.00%
0.00%
0
0
0
515,948
0
701,961
0.735
515,948
0
0
0.00%
0.00%
0.00%
0
0
0
515,948
0
701,961
0.735
515,948
0
0
0.00%
0.00%
0.00%
0
0
0
515,948
0
701,961
0.735
515,948
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
151,051
445,327
0.928
413,217
0
413,217
36.55%
0.00%
100.00%
151,051
0
413,217
413,217
6,547
445,327
0.928
413,217
0
0
1.58%
0.00%
0.00%
6,547
0
0
413,217
0
445,327
0.928
413,217
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
0
445,327
0.928
413,217
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
0
445,327
0.928
413,217
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
0
445,327
0.928
413,217
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
0
445,327
0.928
413,217
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
0
445,327
0.928
413,217
0
0
0.00%
0.00%
0.00%
0
0
0
413,217
0
445,327
0.928
413,217
0
0
0.00%
0.00%
0.00%
0
0
0
77,144
13,435
154,288
0.500
77,144
0
77,144
17.42%
0.00%
100.00%
13,435
0
77,144
77,144
578
154,288
0.500
77,144
0
0
0.75%
0.00%
0.00%
578
0
0
77,144
0
154,288
0.500
77,144
0
0
0.00%
0.00%
0.00%
0
0
0
77,144
0
154,288
0.500
77,144
0
0
0.00%
0.00%
0.00%
0
0
0
77,144
0
154,288
0.500
77,144
0
0
0.00%
0.00%
0.00%
0
0
0
77,144
0
154,288
0.500
77,144
0
0
0.00%
0.00%
0.00%
0
0
0
77,144
0
154,288
0.500
77,144
0
0
0.00%
0.00%
0.00%
0
0
0
77,144
0
154,288
0.500
77,144
0
0
0.00%
0.00%
0.00%
0
0
0
77,144
0
154,288
0.500
77,144
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
25,587
102,346
0.250
25,587
25,587
25,587
100.00%
100.00%
100.00%
25,587
25,587
25,587
25,587
11,116
102,346
0.250
25,587
0
25,587
43.45%
0.00%
100.00%
11,116
0
25,587
25,587
0
102,346
0.250
25,587
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
0
102,346
0.250
25,587
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
0
102,346
0.250
25,587
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
0
102,346
0.250
25,587
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
0
102,346
0.250
25,587
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
0
102,346
0.250
25,587
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
0
102,346
0.250
25,587
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 94 of 114
December 2016

-------
E.6 - OT Only



Number of



90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Percentage of
EPs with
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Total Number of
90% CI on Number of EPs with
Mean Exceeding Threshold -
Source Water Type
Threshold
Total
Number of
UCMR2 EPs
UCMR 2 EPs with
Predicted Mean
Exceeding
National #
EP Ratio
National Number
Threshold
Predicted Mean
Exceeding
Threshold -
Threshold - National Extrapolation
Exceeding
National Extrapolation
(ng/L)
Systems
of EPs




Threshold -
National
Extrapolation





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
18
2
48
1.621
78

8
13.47%
5.56%
44.44%
12
6
40

2
18
1
48
1.621
78

1
5.89%
5.56%
5.56%
6
6
6

6
18
1
48
1.621
78
0
1
3.88%
0.00%
5.56%
4
0
6

10
18
0
48
1.621
78
0
1
1.07%
0.00%
5.56%
1
0
6
All EPs Only
20
18
0
48
1.621
78
0
0
0.04%
0.00%
0.00%
0
0
0

60
18
0
48
1.621
78
0
0
0.00%
0.00%
0.00%
0
0
0

100
18
0
48
1.621
78
0
0
0.00%
0.00%
0.00%
0
0
0

200
18
0
48
1.621
78
0
0
0.00%
0.00%
0.00%
0
0
0

600
18
0
48
1.621
78
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
6
2
22
1.090
24

4
27.31%
16.67%
66.67%
9
6
22

2
6
1
22
1.090
24

1
16.98%
16.67%
16.67%
6
6
6

6
6
1
22
1.090
24
0
1
11.64%
0.00%
16.67%
4
0
6
EPs Only at Surface
Water Systems
10
6
0
22
1.090
24
0
1
3.21%
0.00%
16.67%
1
0
6
20
6
0
22
1.090
24
0
0
0.12%
0.00%
0.00%
0
0
0
60
6
0
22
1.090
24
0
0
0.00%
0.00%
0.00%
0
0
0

100
6
0
22
1.090
24
0
0
0.00%
0.00%
0.00%
0
0
0

200
6
0
22
1.090
24
0
0
0.00%
0.00%
0.00%
0
0
0

600
6
0
22
1.090
24
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
9
1
25
2.040
50
0
3
6.55%
0.00%
33.33%
3
0
17

2
9
0
25
2.040
50
0
0
0.37%
0.00%
0.00%
0
0
0

6
9
0
25
2.040
50
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
10
9
0
25
2.040
50
0
0
0.00%
0.00%
0.00%
0
0
0
20
9
0
25
2.040
50
0
0
0.00%
0.00%
0.00%
0
0
0
60
9
0
25
2.040
50
0
0
0.00%
0.00%
0.00%
0
0
0

100
9
0
25
2.040
50
0
0
0.00%
0.00%
0.00%
0
0
0

200
9
0
25
2.040
50
0
0
0.00%
0.00%
0.00%
0
0
0

600
9
0
25
2.040
50
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
3
0
1
3.000
3
0
1
6.55%
0.00%
33.33%
0
0
1

2
3
0
1
3.000
3
0
0
0.25%
0.00%
0.00%
0
0
0

6
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
10
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
0
1
3.000
3
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 95 of 114
December 2016

-------
E.6 - OT Only
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent ot
Population
Served by EPs
with Predicted
Mean Exceeding
Threshold -
National
Fxtranolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
697,151
74,033
1,746,427
0.641
1,119,294
10,903
336,655
10.62%
1.56%
48.29%
226,429
137,741
609,388
697,151
13,590
1,746,427
0.641
1,119,294
10,903
10,903
1.95%
1.56%
1.56%
141,416
137,741
137,741
697,151
7,615
1,746,427
0.641
1,119,294
0
10,903
1.09%
0.00%
1.56%
96,213
0
137,741
697,151
2,103
1,746,427
0.641
1,119,294
0
10,903
0.30%
0.00%
1.56%
26,568
0
137,741
697,151
82
1,746,427
0.641
1,119,294
0
0
0.01%
0.00%
0.00%
1,032
0
0
697,151
0
1,746,427
0.641
1,119,294
0
0
0.00%
0.00%
0.00%
0
0
0
697,151
0
1,746,427
0.641
1,119,294
0
0
0.00%
0.00%
0.00%
0
0
0
697,151
0
1,746,427
0.641
1,119,294
0
0
0.00%
0.00%
0.00%
0
0
0
697,151
0
1,746,427
0.641
1,119,294
0
0
0.00%
0.00%
0.00%
0
0
0
429,390
56,096
876,128
0.717
628,618
10,903
238,836
13.06%
2.54%
55.62%
192,996
137,741
438,064
429,390
12,591
876,128
0.717
628,618
10,903
10,903
2.93%
2.54%
2.54%
139,587
137,741
137,741
429,390
7,615
876,128
0.717
628,618
0
10,903
1.77%
0.00%
2.54%
96,213
0
137,741
429,390
2,103
876,128
0.717
628,618
0
10,903
0.49%
0.00%
2.54%
26,568
0
137,741
429,390
82
876,128
0.717
628,618
0
0
0.02%
0.00%
0.00%
1,032
0
0
429,390
0
876,128
0.717
628,618
0
0
0.00%
0.00%
0.00%
0
0
0
429,390
0
876,128
0.717
628,618
0
0
0.00%
0.00%
0.00%
0
0
0
429,390
0
876,128
0.717
628,618
0
0
0.00%
0.00%
0.00%
0
0
0
429,390
0
876,128
0.717
628,618
0
0
0.00%
0.00%
0.00%
0
0
0
191,002
12,906
767,954
0.539
413,917
0
72,233
6.76%
0.00%
37.82%
28,402
0
145,738
191,002
807
767,954
0.539
413,917
0
0
0.42%
0.00%
0.00%
1,637
0
0
191,002
0
767,954
0.539
413,917
0
0
0.00%
0.00%
0.00%
0
0
0
191,002
0
767,954
0.539
413,917
0
0
0.00%
0.00%
0.00%
0
0
0
191,002
0
767,954
0.539
413,917
0
0
0.00%
0.00%
0.00%
0
0
0
191,002
0
767,954
0.539
413,917
0
0
0.00%
0.00%
0.00%
0
0
0
191,002
0
767,954
0.539
413,917
0
0
0.00%
0.00%
0.00%
0
0
0
191,002
0
767,954
0.539
413,917
0
0
0.00%
0.00%
0.00%
0
0
0
191,002
0
767,954
0.539
413,917
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
5,031
102,346
0.750
76,760
0
25,587
6.55%
0.00%
33.33%
5,031
0
25,587
76,760
192
102,346
0.750
76,760
0
0
0.25%
0.00%
0.00%
192
0
0
76,760
0
102,346
0.750
76,760
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
0
102,346
0.750
76,760
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
0
102,346
0.750
76,760
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
0
102,346
0.750
76,760
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
0
102,346
0.750
76,760
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
0
102,346
0.750
76,760
0
0
0.00%
0.00%
0.00%
0
0
0
76,760
0
102,346
0.750
76,760
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 96 of 114
December 2016

-------
E.6 - OT Only
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
Predicted Mean
Exceeding
National #
MR Ratio
National Number
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
Threshold -
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
14
6
48
1.393
67
3
12
42.27%
21.43%
85.71%
27
13
51

2
14
2
48
1.393
67

4
14.21%
7.14%
28.57%
10
6
21

6
14
1
48
1.393
67

1
7.13%
7.14%
7.14%
6
6
6

10
14
1
48
1.393
67
0
1
5.81%
0.00%
7.14%
5
0
6
All MRs Only
20
14
0
48
1.393
67
0
1
1.12%
0.00%
7.14%
1
0
6

60
14
0
48
1.393
67
0
0
0.00%
0.00%
0.00%
0
0
0

100
14
0
48
1.393
67
0
0
0.00%
0.00%
0.00%
0
0
0

200
14
0
48
1.393
67
0
0
0.00%
0.00%
0.00%
0
0
0

600
14
0
48
1.393
67
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
6
3
22
1.090
24
2
6
58.15%
33.33%
100.00%
17
12
24

2
6
1
22
1.090
24

2
23.97%
16.67%
33.33%
9
6
12

6
6
1
22
1.090
24

1
16.64%
16.67%
16.67%
6
6
6
MRs Only at
10
6
1
22
1.090
24
0
1
13.55%
0.00%
16.67%
5
0
6
Surface Water
20
6
0
22
1.090
24
0
1
2.62%
0.00%
16.67%
1
0
6
Systems
60
6
0
22
1.090
24
0
0
0.00%
0.00%
0.00%
0
0
0

100
6
0
22
1.090
24
0
0
0.00%
0.00%
0.00%
0
0
0

200
6
0
22
1.090
24
0
0
0.00%
0.00%
0.00%
0
0
0

600
6
0
22
1.090
24
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
7
1
25
1.680
42
0
5
20.41%
0.00%
71.43%
9
0
26

2
7
0
25
1.680
42
0
1
1.66%
0.00%
14.29%
1
0
8

6
7
0
25
1.680
42
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
7
0
25
1.680
42
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
7
0
25
1.680
42
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
7
0
25
1.680
42
0
0
0.00%
0.00%
0.00%
0
0
0

100
7
0
25
1.680
42
0
0
0.00%
0.00%
0.00%
0
0
0

200
7
0
25
1.680
42
0
0
0.00%
0.00%
0.00%
0
0
0

600
7
0
25
1.680
42
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
1
1
1.000
1

1
100.00%
100.00%
100.00%
1

1

2
1
0
1
1.000
1
0
1
43.45%
0.00%
100.00%
0
0
1

6
1
0
1
1.000
1
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
1
0
1
1.000
1
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
1
0
1
1.000
1
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
1
0
1
1.000
1
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
0
1
1.000
1
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
0
1
1.000
1
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
0
1
1.000
1
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 97 of 114
December 2016

-------
E.6 - OT Only
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent ot
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Fxtranolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
632,149
228,052
1,746,427
0.601
1,049,811
41,739
597,585
36.08%
6.60%
94.53%
467,939
229,656
939,771
632,149
33,233
1,746,427
0.601
1,049,811
10,903
72,650
5.26%
1.72%
11.49%
187,681
137,741
328,067
632,149
10,882
1,746,427
0.601
1,049,811
10,903
10,903
1.72%
1.72%
1.72%
137,484
137,741
137,741
632,149
8,861
1,746,427
0.601
1,049,811
0
10,903
1.40%
0.00%
1.72%
111,947
0
137,741
632,149
1,715
1,746,427
0.601
1,049,811
0
10,903
0.27%
0.00%
1.72%
21,667
0
137,741
632,149
0
1,746,427
0.601
1,049,811
0
0
0.00%
0.00%
0.00%
0
0
0
632,149
0
1,746,427
0.601
1,049,811
0
0
0.00%
0.00%
0.00%
0
0
0
632,149
0
1,746,427
0.601
1,049,811
0
0
0.00%
0.00%
0.00%
0
0
0
632,149
0
1,746,427
0.601
1,049,811
0
0
0.00%
0.00%
0.00%
0
0
0
429,390
167,192
876,128
0.717
628,618
16,153
429,390
38.94%
3.76%
100.00%
359,392
204,070
628,618
429,390
19,407
876,128
0.717
628,618
10,903
16,153
4.52%
2.54%
3.76%
169,198
137,741
204,070
429,390
10,882
876,128
0.717
628,618
10,903
10,903
2.53%
2.54%
2.54%
137,484
137,741
137,741
429,390
8,861
876,128
0.717
628,618
0
10,903
2.06%
0.00%
2.54%
111,947
0
137,741
429,390
1,715
876,128
0.717
628,618
0
10,903
0.40%
0.00%
2.54%
21,667
0
137,741
429,390
0
876,128
0.717
628,618
0
0
0.00%
0.00%
0.00%
0
0
0
429,390
0
876,128
0.717
628,618
0
0
0.00%
0.00%
0.00%
0
0
0
429,390
0
876,128
0.717
628,618
0
0
0.00%
0.00%
0.00%
0
0
0
429,390
0
876,128
0.717
628,618
0
0
0.00%
0.00%
0.00%
0
0
0
177,173
35,273
767,954
0.515
395,607
0
142,609
19.91%
0.00%
80.49%
82,960
0
285,566
177,173
2,710
767,954
0.515
395,607
0
30,911
1.53%
0.00%
17.45%
7,367
0
98,410
177,173
0
767,954
0.515
395,607
0
0
0.00%
0.00%
0.00%
0
0
0
177,173
0
767,954
0.515
395,607
0
0
0.00%
0.00%
0.00%
0
0
0
177,173
0
767,954
0.515
395,607
0
0
0.00%
0.00%
0.00%
0
0
0
177,173
0
767,954
0.515
395,607
0
0
0.00%
0.00%
0.00%
0
0
0
177,173
0
767,954
0.515
395,607
0
0
0.00%
0.00%
0.00%
0
0
0
177,173
0
767,954
0.515
395,607
0
0
0.00%
0.00%
0.00%
0
0
0
177,173
0
767,954
0.515
395,607
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
25,587
102,346
0.250
25,587
25,587
25,587
100.00%
100.00%
100.00%
25,587
25,587
25,587
25,587
11,116
102,346
0.250
25,587
0
25,587
43.45%
0.00%
100.00%
11,116
0
25,587
25,587
0
102,346
0.250
25,587
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
0
102,346
0.250
25,587
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
0
102,346
0.250
25,587
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
0
102,346
0.250
25,587
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
0
102,346
0.250
25,587
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
0
102,346
0.250
25,587
0
0
0.00%
0.00%
0.00%
0
0
0
25,587
0
102,346
0.250
25,587
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 98 of 114
December 2016

-------
E.7 - ND Only
Source Water Type
Threshold
Total
Number of
UCMR2 EPs
Number of
UCMR 2 EPs with
Predicted Mean
Exceeding
Threshold
National #
EP Ratio
National Number
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
Systems
of EPs
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)

0.6
80
6
8,222
1.488
12,235
2
11
6.97%
2.50%
13.75%
836
321
1,463

2
80
1
8,222
1.488
12,235
0
3
1.41%
0.00%
3.75%
180
0
482

6
80
0
8,222
1.488
12,235
0
0
0.04%
0.00%
0.00%
5
0
0

10
80
0
8,222
1.488
12,235
0
0
0.00%
0.00%
0.00%
1
0
0
All EPs Only
20
80
0
8,222
1.488
12,235
0
0
0.00%
0.00%
0.00%
0
0
0

60
80
0
8,222
1.488
12,235
0
0
0.00%
0.00%
0.00%
0
0
0

100
80
0
8,222
1.488
12,235
0
0
0.00%
0.00%
0.00%
0
0
0

200
80
0
8,222
1.488
12,235
0
0
0.00%
0.00%
0.00%
0
0
0

600
80
0
8,222
1.488
12,235
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
4
0
36
1.000
36
0
2
9.78%
0.00%
50.00%
4
0
18

2
4
0
36
1.000
36
0
0
0.23%
0.00%
0.00%
0
0
0

6
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
10
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
20
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
60
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0

100
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0

200
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0

600
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
76
5
8,187
1.490
12,200
2
9
6.83%
2.63%
11.84%
833
321
1,445

2
76
1
8,187
1.490
12,200
0
3
1.47%
0.00%
3.95%
180
0
482

6
76
0
8,187
1.490
12,200
0
0
0.04%
0.00%
0.00%
5
0
0
EPs Only at Ground
Water Systems
10
76
0
8,187
1.490
12,200
0
0
0.00%
0.00%
0.00%
1
0
0
20
76
0
8,187
1.490
12,200
0
0
0.00%
0.00%
0.00%
0
0
0
60
76
0
8,187
1.490
12,200
0
0
0.00%
0.00%
0.00%
0
0
0

100
76
0
8,187
1.490
12,200
0
0
0.00%
0.00%
0.00%
0
0
0

200
76
0
8,187
1.490
12,200
0
0
0.00%
0.00%
0.00%
0
0
0

600
76
0
8,187
1.490
12,200
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 99 of 114
December 2016

-------
E.7 - ND Only
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of Population
Served by EPs with
Predicted Mean
Exceeding Threshold -
National Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
39,004
4,281
6,985,901
0.920
6,424,530
1,706
8,536
10.97%
4.37%
21.88%
705,168
282,263
1,399,431
39,004
931
6,985,901
0.920
6,424,530
0
2,800
2.39%
0.00%
7.18%
153,930
0
463,269
39,004
21
6,985,901
0.920
6,424,530
0
0
0.05%
0.00%
0.00%
3,401
0
0
39,004
1
6,985,901
0.920
6,424,530
0
0
0.00%
0.00%
0.00%
190
0
0
39,004
0
6,985,901
0.920
6,424,530
0
0
0.00%
0.00%
0.00%
0
0
0
39,004
0
6,985,901
0.920
6,424,530
0
0
0.00%
0.00%
0.00%
0
0
0
39,004
0
6,985,901
0.920
6,424,530
0
0
0.00%
0.00%
0.00%
0
0
0
39,004
0
6,985,901
0.920
6,424,530
0
0
0.00%
0.00%
0.00%
0
0
0
39,004
0
6,985,901
0.920
6,424,530
0
0
0.00%
0.00%
0.00%
0
0
0
448
48
90,645
0.500
45,323
0
200
10.64%
0.00%
44.69%
4,820
0
20,256
448
2
90,645
0.500
45,323
0
0
0.37%
0.00%
0.00%
166
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
38,556
4,233
6,895,255
0.925
6,379,207
1,706
8,336
10.98%
4.42%
21.62%
700,348
282,263
1,379,175
38,556
929
6,895,255
0.925
6,379,207
0
2,800
2.41%
0.00%
7.26%
153,764
0
463,269
38,556
21
6,895,255
0.925
6,379,207
0
0
0.05%
0.00%
0.00%
3,401
0
0
38,556
1
6,895,255
0.925
6,379,207
0
0
0.00%
0.00%
0.00%
190
0
0
38,556
0
6,895,255
0.925
6,379,207
0
0
0.00%
0.00%
0.00%
0
0
0
38,556
0
6,895,255
0.925
6,379,207
0
0
0.00%
0.00%
0.00%
0
0
0
38,556
0
6,895,255
0.925
6,379,207
0
0
0.00%
0.00%
0.00%
0
0
0
38,556
0
6,895,255
0.925
6,379,207
0
0
0.00%
0.00%
0.00%
0
0
0
38,556
0
6,895,255
0.925
6,379,207
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 100 of 114
December 2016

-------
E.7 - ND Only
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
Predicted Mean
National #
MR Ratio
National Number
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)

0.6
17
2
8,222
0.258
2,123
0
7
14.27%
0.00%
41.18%
215
0
669

2
17
0
8,222
0.258
2,123
0
1
0.65%
0.00%
5.88%
11
0
161

6
17
0
8,222
0.258
2,123
0
0
0.00%
0.00%
0.00%
0
0
0

10
17
0
8,222
0.258
2,123
0
0
0.00%
0.00%
0.00%
0
0
0
All MRs Only
20
17
0
8,222
0.258
2,123
0
0
0.00%
0.00%
0.00%
0
0
0

60
17
0
8,222
0.258
2,123
0
0
0.00%
0.00%
0.00%
0
0
0

100
17
0
8,222
0.258
2,123
0
0
0.00%
0.00%
0.00%
0
0
0

200
17
0
8,222
0.258
2,123
0
0
0.00%
0.00%
0.00%
0
0
0

600
17
0
8,222
0.258
2,123
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
4
1
36
1.000
36
0
3
28.70%
0.00%
75.00%
10
0
27

2
4
0
36
1.000
36
0
0
1.03%
0.00%
0.00%
0
0
0

6
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
20
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0

100
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0

200
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0

600
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
13
1
8,187
0.255
2,087
0
4
9.82%
0.00%
30.77%
205
0
642

2
13
0
8,187
0.255
2,087
0
1
0.53%
0.00%
7.69%
11
0
161

6
13
0
8,187
0.255
2,087
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
13
0
8,187
0.255
2,087
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
13
0
8,187
0.255
2,087
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
13
0
8,187
0.255
2,087
0
0
0.00%
0.00%
0.00%
0
0
0

100
13
0
8,187
0.255
2,087
0
0
0.00%
0.00%
0.00%
0
0
0

200
13
0
8,187
0.255
2,087
0
0
0.00%
0.00%
0.00%
0
0
0

600
13
0
8,187
0.255
2,087
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 101 of 114
December 2016

-------
E.7 - ND Only
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
3,567
438
6,985,901
0.080
561,371
0
1,554
12.29%
0.00%
43.57%
64,269
0
232,222
3,567
20
6,985,901
0.080
561,371
0
30
0.55%
0.00%
0.84%
2,909
0
4,964
3,567
0
6,985,901
0.080
561,371
0
0
0.00%
0.00%
0.00%
0
0
0
3,567
0
6,985,901
0.080
561,371
0
0
0.00%
0.00%
0.00%
0
0
0
3,567
0
6,985,901
0.080
561,371
0
0
0.00%
0.00%
0.00%
0
0
0
3,567
0
6,985,901
0.080
561,371
0
0
0.00%
0.00%
0.00%
0
0
0
3,567
0
6,985,901
0.080
561,371
0
0
0.00%
0.00%
0.00%
0
0
0
3,567
0
6,985,901
0.080
561,371
0
0
0.00%
0.00%
0.00%
0
0
0
3,567
0
6,985,901
0.080
561,371
0
0
0.00%
0.00%
0.00%
0
0
0
448
128
90,645
0.500
45,323
0
388
28.68%
0.00%
86.59%
12,999
0
39,246
448
5
90,645
0.500
45,323
0
0
1.11%
0.00%
0.00%
504
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
3,119
310
6,895,255
0.075
516,048
0
1,166
9.94%
0.00%
37.39%
51,270
0
192,976
3,119
15
6,895,255
0.075
516,048
0
30
0.47%
0.00%
0.96%
2,405
0
4,964
3,119
0
6,895,255
0.075
516,048
0
0
0.00%
0.00%
0.00%
0
0
0
3,119
0
6,895,255
0.075
516,048
0
0
0.00%
0.00%
0.00%
0
0
0
3,119
0
6,895,255
0.075
516,048
0
0
0.00%
0.00%
0.00%
0
0
0
3,119
0
6,895,255
0.075
516,048
0
0
0.00%
0.00%
0.00%
0
0
0
3,119
0
6,895,255
0.075
516,048
0
0
0.00%
0.00%
0.00%
0
0
0
3,119
0
6,895,255
0.075
516,048
0
0
0.00%
0.00%
0.00%
0
0
0
3,119
0
6,895,255
0.075
516,048
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 102 of 114
December 2016

-------
E.7 - ND Only
Source Water Type
Threshold
Total
Number of
UCMR2 EPs
Number of
UCMR 2 EPs with
Predicted Mean
Exceeding
Threshold
National #
EP Ratio
National Number
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
Systems
of EPs
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)

0.6
51
7
24
15.333
363
3
11
13.55%
5.88%
21.57%
53
24
79

2
51
1
24
15.333
363
0
3
2.19%
0.00%
5.88%
9
0
24

6
51
0
24
15.333
363
0
0
0.04%
0.00%
0.00%
0
0
0

10
51
0
24
15.333
363
0
0
0.00%
0.00%
0.00%
0
0
0
All EPs Only
20
51
0
24
15.333
363
0
0
0.00%
0.00%
0.00%
0
0
0

60
51
0
24
15.333
363
0
0
0.00%
0.00%
0.00%
0
0
0

100
51
0
24
15.333
363
0
0
0.00%
0.00%
0.00%
0
0
0

200
51
0
24
15.333
363
0
0
0.00%
0.00%
0.00%
0
0
0

600
51
0
24
15.333
363
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
46
7
24
15.333
363
3
10
14.66%
6.52%
21.74%
53
24
79

2
46
1
24
15.333
363
0
3
2.42%
0.00%
6.52%
9
0
24

6
46
0
24
15.333
363
0
0
0.04%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
10
46
0
24
15.333
363
0
0
0.00%
0.00%
0.00%
0
0
0
20
46
0
24
15.333
363
0
0
0.00%
0.00%
0.00%
0
0
0
60
46
0
24
15.333
363
0
0
0.00%
0.00%
0.00%
0
0
0

100
46
0
24
15.333
363
0
0
0.00%
0.00%
0.00%
0
0
0

200
46
0
24
15.333
363
0
0
0.00%
0.00%
0.00%
0
0
0

600
46
0
24
15.333
363
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
5
0
0
0.000
0
0
1
3.33%
0.00%
20.00%
0
0
0

2
5
0
0
0.000
0
0
0
0.07%
0.00%
0.00%
0
0
0

6
5
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
10
5
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
5
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
5
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
5
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
5
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
5
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 103 of 114
December 2016

-------
E.7 - ND Only
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of Population
Served by EPs with
Predicted Mean
Exceeding Threshold -
National Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
312,408
34,207
613,666
1.371
841,565
14,100
66,025
10.95%
4.51%
21.13%
115,047
51,587
175,515
312,408
5,273
613,666
1.371
841,565
0
14,100
1.69%
0.00%
4.51%
19,058
0
51,587
312,408
84
613,666
1.371
841,565
0
0
0.03%
0.00%
0.00%
309
0
0
312,408
0
613,666
1.371
841,565
0
0
0.00%
0.00%
0.00%
0
0
0
312,408
0
613,666
1.371
841,565
0
0
0.00%
0.00%
0.00%
0
0
0
312,408
0
613,666
1.371
841,565
0
0
0.00%
0.00%
0.00%
0
0
0
312,408
0
613,666
1.371
841,565
0
0
0.00%
0.00%
0.00%
0
0
0
312,408
0
613,666
1.371
841,565
0
0
0.00%
0.00%
0.00%
0
0
0
312,408
0
613,666
1.371
841,565
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
230,022
31,445
613,666
1.371
841,565
14,100
47,973
13.67%
6.13%
20.86%
115,047
51,587
175,515
230,022
5,209
613,666
1.371
841,565
0
14,100
2.26%
0.00%
6.13%
19,058
0
51,587
230,022
84
613,666
1.371
841,565
0
0
0.04%
0.00%
0.00%
309
0
0
230,022
0
613,666
1.371
841,565
0
0
0.00%
0.00%
0.00%
0
0
0
230,022
0
613,666
1.371
841,565
0
0
0.00%
0.00%
0.00%
0
0
0
230,022
0
613,666
1.371
841,565
0
0
0.00%
0.00%
0.00%
0
0
0
230,022
0
613,666
1.371
841,565
0
0
0.00%
0.00%
0.00%
0
0
0
230,022
0
613,666
1.371
841,565
0
0
0.00%
0.00%
0.00%
0
0
0
230,022
0
613,666
1.371
841,565
0
0
0.00%
0.00%
0.00%
0
0
0
82,386
2,762
0
0.000
0
0
18,052
3.35%
0.00%
21.91%
0
0
0
82,386
64
0
0.000
0
0
0
0.08%
0.00%
0.00%
0
0
0
82,386
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
82,386
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
82,386
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
82,386
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
82,386
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
82,386
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
82,386
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 104 of 114
December 2016

-------
E.7 - ND Only
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
Predicted Mean
National #
MR Ratio
National Number
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)

0.6
1
0
24
0.333
8
0
1
11.24%
0.00%
100.00%
1
0
8

2
1
0
24
0.333
8
0
0
0.37%
0.00%
0.00%
0
0
0

6
1
0
24
0.333
8
0
0
0.00%
0.00%
0.00%
0
0
0

10
1
0
24
0.333
8
0
0
0.00%
0.00%
0.00%
0
0
0
All MRs Only
20
1
0
24
0.333
8
0
0
0.00%
0.00%
0.00%
0
0
0

60
1
0
24
0.333
8
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
0
24
0.333
8
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
0
24
0.333
8
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
0
24
0.333
8
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
1
0
24
0.333
8
0
1
11.24%
0.00%
100.00%
1
0
8

2
1
0
24
0.333
8
0
0
0.37%
0.00%
0.00%
0
0
0

6
1
0
24
0.333
8
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
1
0
24
0.333
8
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
1
0
24
0.333
8
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
1
0
24
0.333
8
0
0
0.00%
0.00%
0.00%
0
0
0

100
1
0
24
0.333
8
0
0
0.00%
0.00%
0.00%
0
0
0

200
1
0
24
0.333
8
0
0
0.00%
0.00%
0.00%
0
0
0

600
1
0
24
0.333
8
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 105 of 114
December 2016

-------
E.7 - ND Only
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
2,750
309
613,666
0.016
10,061
0
2,750
11.24%
0.00%
100.00%
1,130
0
10,061
2,750
10
613,666
0.016
10,061
0
0
0.37%
0.00%
0.00%
38
0
0
2,750
0
613,666
0.016
10,061
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
0
613,666
0.016
10,061
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
0
613,666
0.016
10,061
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
0
613,666
0.016
10,061
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
0
613,666
0.016
10,061
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
0
613,666
0.016
10,061
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
0
613,666
0.016
10,061
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
309
613,666
0.016
10,061
0
2,750
11.24%
0.00%
100.00%
1,130
0
10,061
2,750
10
613,666
0.016
10,061
0
0
0.37%
0.00%
0.00%
38
0
0
2,750
0
613,666
0.016
10,061
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
0
613,666
0.016
10,061
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
0
613,666
0.016
10,061
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
0
613,666
0.016
10,061
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
0
613,666
0.016
10,061
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
0
613,666
0.016
10,061
0
0
0.00%
0.00%
0.00%
0
0
0
2,750
0
613,666
0.016
10,061
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 106 of 114
December 2016

-------
E.7 - ND Only
Source Water Type
Threshold
Total
Number of
UCMR2 EPs
Number of
UCMR 2 EPs with
Predicted Mean
Exceeding
Threshold
National #
EP Ratio
National Number
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
Systems
of EPs
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Threshold -
National
Extrapolation
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
82
8
1
9.000
9
2
15
9.52%
2.44%
18.72%
1
0
2

2
82
0
1
9.000
9
0
3
0.50%
0.00%
3.66%
0
0
1

6
82
0
1
9.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

10
82
0
1
9.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
All EPs Only
20
82
0
1
9.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

60
82
0
1
9.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

100
82
0
1
9.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

200
82
0
1
9.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

600
82
0
1
9.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
9
1
1
9.000
9
0
2
10.26%
0.00%
22.22%
1
0
2

2
9
0
1
9.000
9
0
1
0.69%
0.00%
11.11%
0
0
1

6
9
0
1
9.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
10
9
0
1
9.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
20
9
0
1
9.000
9
0
0
0.00%
0.00%
0.00%
0
0
0
60
9
0
1
9.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

100
9
0
1
9.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

200
9
0
1
9.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

600
9
0
1
9.000
9
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
73
7
0
0.000
0
2
13
9.42%
2.74%
18.29%
0
0
0

2
73
0
0
0.000
0
0
2
0.47%
0.00%
2.74%
0
0
0

6
73
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
10
73
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
73
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
73
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
73
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
73
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
73
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 107 of 114
December 2016

-------
E.7 - ND Only
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of Population
Served by EPs with
Predicted Mean
Exceeding Threshold -
National Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
614,607
24,856
107,323
2.030
217,841
5,498
64,902
4.04%
0.89%
10.56%
4,609
0
23,664
614,607
1,081
107,323
2.030
217,841
0
7,698
0.18%
0.00%
1.25%
136
0
2,199
614,607
0
107,323
2.030
217,841
0
0
0.00%
0.00%
0.00%
0
0
0
614,607
0
107,323
2.030
217,841
0
0
0.00%
0.00%
0.00%
0
0
0
614,607
0
107,323
2.030
217,841
0
0
0.00%
0.00%
0.00%
0
0
0
614,607
0
107,323
2.030
217,841
0
0
0.00%
0.00%
0.00%
0
0
0
614,607
0
107,323
2.030
217,841
0
0
0.00%
0.00%
0.00%
0
0
0
614,607
0
107,323
2.030
217,841
0
0
0.00%
0.00%
0.00%
0
0
0
614,607
0
107,323
2.030
217,841
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
217,841
4,609
107,323
2.030
217,841
0
23,664
2.12%
0.00%
10.86%
4,609
0
23,664
217,841
136
107,323
2.030
217,841
0
2,199
0.06%
0.00%
1.01%
136
0
2,199
217,841
0
107,323
2.030
217,841
0
0
0.00%
0.00%
0.00%
0
0
0
217,841
0
107,323
2.030
217,841
0
0
0.00%
0.00%
0.00%
0
0
0
217,841
0
107,323
2.030
217,841
0
0
0.00%
0.00%
0.00%
0
0
0
217,841
0
107,323
2.030
217,841
0
0
0.00%
0.00%
0.00%
0
0
0
217,841
0
107,323
2.030
217,841
0
0
0.00%
0.00%
0.00%
0
0
0
217,841
0
107,323
2.030
217,841
0
0
0.00%
0.00%
0.00%
0
0
0
217,841
0
107,323
2.030
217,841
0
0
0.00%
0.00%
0.00%
0
0
0
396,766
20,247
0
0.000
0
5,498
41,238
5.10%
1.39%
10.39%
0
0
0
396,766
945
0
0.000
0
0
5,498
0.24%
0.00%
1.39%
0
0
0
396,766
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
396,766
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
396,766
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
396,766
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
396,766
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
396,766
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
396,766
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 108 of 114
December 2016

-------
E.7 - ND Only
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
Predicted Mean
National #
MR Ratio
National Number
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)

0.6
3
2
1
0.000
0
1
3
68.23%
33.33%
100.00%
0
0
0

2
3
1
1
0.000
0
0
2
19.41%
0.00%
66.67%
0
0
0

6
3
0
1
0.000
0
0
0
0.37%
0.00%
0.00%
0
0
0

10
3
0
1
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
All MRs Only
20
3
0
1
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

60
3
0
1
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
0
1
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
0
1
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
0
1
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
20
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
0
0
1
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

2
0
0
1
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

6
0
0
1
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
0
0
1
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
0
0
1
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
0
0
1
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
0
0
1
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
0
0
1
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
0
0
1
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
3
2
0
0.000
0
1
3
68.23%
33.33%
100.00%
0
0
0

2
3
1
0
0.000
0
0
2
19.41%
0.00%
66.67%
0
0
0

6
3
0
0
0.000
0
0
0
0.37%
0.00%
0.00%
0
0
0
MRs Only at
10
3
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
3
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
3
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 109 of 114
December 2016

-------
E.7 - ND Only
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
8,943
5,703
107,323
0.000
0
2,749
8,943
63.77%
30.74%
100.00%
0
0
0
8,943
1,601
107,323
0.000
0
0
5,498
17.90%
0.00%
61.48%
0
0
0
8,943
31
107,323
0.000
0
0
0
0.35%
0.00%
0.00%
0
0
0
8,943
0
107,323
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
107,323
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
107,323
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
107,323
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
107,323
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
107,323
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
107,323
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
107,323
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
107,323
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
107,323
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
107,323
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
107,323
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
107,323
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
107,323
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
0
0
107,323
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
5,703
0
0.000
0
2,749
8,943
63.77%
30.74%
100.00%
0
0
0
8,943
1,601
0
0.000
0
0
5,498
17.90%
0.00%
61.48%
0
0
0
8,943
31
0
0.000
0
0
0
0.35%
0.00%
0.00%
0
0
0
8,943
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 110 of 114
December 2016

-------
E.7 - ND Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2 EPs
Number of
UCMR 2 EPs with
Predicted Mean
Exceeding
Threshold
National #
Systems
EP Ratio
National Number
of EPs
90% CI on Number of UCMR 2 EPs
with Predicted Mean Exceeding
Threshold
Percentage of
EPs with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of EPs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Number of EPs with
Mean Exceeding Threshold -
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All EPs Only
0.6
213
20
8,247
1.529
12,608
7
37
9.53%
3.29%
17.54%
890
345
1,544
2
213
3
8,247
1.529
12,608
0
9
1.25%
0.00%
4.23%
189
0
506
6
213
0
8,247
1.529
12,608
0
0
0.02%
0.00%
0.00%
6
0
0
10
213
0
8,247
1.529
12,608
0
0
0.00%
0.00%
0.00%
1
0
0
20
213
0
8,247
1.529
12,608
0
0
0.00%
0.00%
0.00%
0
0
0
60
213
0
8,247
1.529
12,608
0
0
0.00%
0.00%
0.00%
0
0
0
100
213
0
8,247
1.529
12,608
0
0
0.00%
0.00%
0.00%
0
0
0
200
213
0
8,247
1.529
12,608
0
0
0.00%
0.00%
0.00%
0
0
0
600
213
0
8,247
1.529
12,608
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Surface
Water Systems
0.6
4
0
36
1.000
36
0
2
9.78%
0.00%
50.00%
4
0
18
2
4
0
36
1.000
36
0
0
0.23%
0.00%
0.00%
0
0
0
6
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
10
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
20
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
60
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
100
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
200
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
600
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at Ground
Water Systems
0.6
131
13
8,211
1.531
12,572
5
21
9.81%
3.82%
16.03%
887
345
1,526
2
131
2
8,211
1.531
12,572
0
7
1.75%
0.00%
5.34%
189
0
506
6
131
0
8,211
1.531
12,572
0
0
0.04%
0.00%
0.00%
6
0
0
10
131
0
8,211
1.531
12,572
0
0
0.00%
0.00%
0.00%
1
0
0
20
131
0
8,211
1.531
12,572
0
0
0.00%
0.00%
0.00%
0
0
0
60
131
0
8,211
1.531
12,572
0
0
0.00%
0.00%
0.00%
0
0
0
100
131
0
8,211
1.531
12,572
0
0
0.00%
0.00%
0.00%
0
0
0
200
131
0
8,211
1.531
12,572
0
0
0.00%
0.00%
0.00%
0
0
0
600
131
0
8,211
1.531
12,572
0
0
0.00%
0.00%
0.00%
0
0
0
EPs Only at
Mixed Water
Systems
0.6
78
7
0
0.000
0
2
14
9.03%
2.56%
18.40%
0
0
0
2
78
0
0
0.000
0
0
2
0.45%
0.00%
2.56%
0
0
0
6
78
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
78
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
78
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
78
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
78
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
78
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
78
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 111 of 114
December 2016

-------
E.7 - ND Only
Total Population
Served by UCMR
2 EPs
Population
Served by UCMR
2 EPs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
EP Ratio
National
Population
Served by EPs
90% CI on Population Served by
UCMR 2 EPs with Predicted Mean
Exceeding Threshold
Percent of Population
Served by EPs with
Predicted Mean
Exceeding Threshold -
National Extrapolation
90% CI on Percent of Population
Served by EPs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by EPs with Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by EPs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
966,018
63,344
7,706,889
0.971
7,483,937
21,304
139,463
6.56%
2.21%
14.44%
824,825
333,850
1,598,610
966,018
7,284
7,706,889
0.971
7,483,937
0
24,598
0.75%
0.00%
2.55%
173,123
0
517,054
966,018
105
7,706,889
0.971
7,483,937
0
0
0.01%
0.00%
0.00%
3,710
0
0
966,018
1
7,706,889
0.971
7,483,937
0
0
0.00%
0.00%
0.00%
190
0
0
966,018
0
7,706,889
0.971
7,483,937
0
0
0.00%
0.00%
0.00%
0
0
0
966,018
0
7,706,889
0.971
7,483,937
0
0
0.00%
0.00%
0.00%
0
0
0
966,018
0
7,706,889
0.971
7,483,937
0
0
0.00%
0.00%
0.00%
0
0
0
966,018
0
7,706,889
0.971
7,483,937
0
0
0.00%
0.00%
0.00%
0
0
0
966,018
0
7,706,889
0.971
7,483,937
0
0
0.00%
0.00%
0.00%
0
0
0
448
48
90,645
0.500
45,323
0
200
10.64%
0.00%
44.69%
4,820
0
20,256
448
2
90,645
0.500
45,323
0
0
0.37%
0.00%
0.00%
166
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
486,419
40,288
7,616,244
0.977
7,438,614
15,806
79,973
8.28%
3.25%
16.44%
820,004
333,850
1,578,354
486,419
6,274
7,616,244
0.977
7,438,614
0
19,099
1.29%
0.00%
3.93%
172,957
0
517,054
486,419
105
7,616,244
0.977
7,438,614
0
0
0.02%
0.00%
0.00%
3,710
0
0
486,419
1
7,616,244
0.977
7,438,614
0
0
0.00%
0.00%
0.00%
190
0
0
486,419
0
7,616,244
0.977
7,438,614
0
0
0.00%
0.00%
0.00%
0
0
0
486,419
0
7,616,244
0.977
7,438,614
0
0
0.00%
0.00%
0.00%
0
0
0
486,419
0
7,616,244
0.977
7,438,614
0
0
0.00%
0.00%
0.00%
0
0
0
486,419
0
7,616,244
0.977
7,438,614
0
0
0.00%
0.00%
0.00%
0
0
0
486,419
0
7,616,244
0.977
7,438,614
0
0
0.00%
0.00%
0.00%
0
0
0
479,151
23,009
0
0.000
0
5,498
59,291
4.80%
1.15%
12.37%
0
0
0
479,151
1,009
0
0.000
0
0
5,498
0.21%
0.00%
1.15%
0
0
0
479,151
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
479,151
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
479,151
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
479,151
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
479,151
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
479,151
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
479,151
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 112 of 114
December 2016

-------
E.7 - ND Only
Source Water Type
Threshold
Total Number of
Number of
UCMR 2 MRs with
Predicted Mean
National #
MR Ratio
National Number
90% CI on Number of UCMR 2 MRs
with Predicted Mean Exceeding
Threshold
Percentage of
MRs with
Predicted Mean
Exceeding
90% CI on Percentage of MRs with
Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
MRs with Mean
Exceeding
90% CI on Number of MRs with
Mean Exceeding Threshold -
National Extrapolation
(ng/L)
UCMR2 MRs
Systems
of MRs




Threshold -





Threshold



Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
National
Extrapolation
Lower Bound
Upper Bound
ALL SYSTEMS

0.6
21
5
8,247
0.258
2,130
1
11
21.83%
4.76%
52.38%
216
0
677

2
21
1
8,247
0.258
2,130
0
3
3.32%
0.00%
14.29%
12
0
161

6
21
0
8,247
0.258
2,130
0
0
0.05%
0.00%
0.00%
0
0
0

10
21
0
8,247
0.258
2,130
0
0
0.00%
0.00%
0.00%
0
0
0
All MRs Only
20
21
0
8,247
0.258
2,130
0
0
0.00%
0.00%
0.00%
0
0
0

60
21
0
8,247
0.258
2,130
0
0
0.00%
0.00%
0.00%
0
0
0

100
21
0
8,247
0.258
2,130
0
0
0.00%
0.00%
0.00%
0
0
0

200
21
0
8,247
0.258
2,130
0
0
0.00%
0.00%
0.00%
0
0
0

600
21
0
8,247
0.258
2,130
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
4
1
36
1.000
36
0
3
28.70%
0.00%
75.00%
10
0
27

2
4
0
36
1.000
36
0
0
1.03%
0.00%
0.00%
0
0
0

6
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
20
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0

100
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0

200
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0

600
4
0
36
1.000
36
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
14
1
8,211
0.255
2,095
0
5
9.93%
0.00%
35.71%
206
0
650

2
14
0
8,211
0.255
2,095
0
1
0.52%
0.00%
7.14%
11
0
161

6
14
0
8,211
0.255
2,095
0
0
0.00%
0.00%
0.00%
0
0
0
MRs Only at
10
14
0
8,211
0.255
2,095
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
20
14
0
8,211
0.255
2,095
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
14
0
8,211
0.255
2,095
0
0
0.00%
0.00%
0.00%
0
0
0

100
14
0
8,211
0.255
2,095
0
0
0.00%
0.00%
0.00%
0
0
0

200
14
0
8,211
0.255
2,095
0
0
0.00%
0.00%
0.00%
0
0
0

600
14
0
8,211
0.255
2,095
0
0
0.00%
0.00%
0.00%
0
0
0

0.6
3
2
0
0.000
0
1
3
68.23%
33.33%
100.00%
0
0
0

2
3
1
0
0.000
0
0
2
19.41%
0.00%
66.67%
0
0
0

6
3
0
0
0.000
0
0
0
0.37%
0.00%
0.00%
0
0
0
MRs Only at
10
3
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
20
3
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Systems
60
3
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

100
3
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

200
3
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0

600
3
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 113 of 114
December 2016

-------
E.7 - ND Only
Total Population
Served by UCMR
2 MRs
Population
Served by UCMR
2 MRs with
Predicted Mean
Exceeding
Threshold
National Pop.
Served
MR Ratio
National
Population
Served by MRs
90% CI on Population Served by
UCMR 2 MRs with Predicted Mean
Exceeding Threshold
Percent of
Population
Served by MRs
with Predicted
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by MRs with Predicted Mean
Exceeding Threshold - National
Extrapolation
Total Pop. Served
by MRs with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by MRs
with Mean Exceeding Threshold-
National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
15,259
6,450
7,706,889
0.074
571,432
2,749
13,247
42.27%
18.02%
86.81%
65,400
0
242,283
15,259
1,631
7,706,889
0.074
571,432
0
5,528
10.69%
0.00%
36.23%
2,947
0
4,964
15,259
31
7,706,889
0.074
571,432
0
0
0.20%
0.00%
0.00%
0
0
0
15,259
0
7,706,889
0.074
571,432
0
0
0.00%
0.00%
0.00%
0
0
0
15,259
0
7,706,889
0.074
571,432
0
0
0.00%
0.00%
0.00%
0
0
0
15,259
0
7,706,889
0.074
571,432
0
0
0.00%
0.00%
0.00%
0
0
0
15,259
0
7,706,889
0.074
571,432
0
0
0.00%
0.00%
0.00%
0
0
0
15,259
0
7,706,889
0.074
571,432
0
0
0.00%
0.00%
0.00%
0
0
0
15,259
0
7,706,889
0.074
571,432
0
0
0.00%
0.00%
0.00%
0
0
0
448
128
90,645
0.500
45,323
0
388
28.68%
0.00%
86.59%
12,999
0
39,246
448
5
90,645
0.500
45,323
0
0
1.11%
0.00%
0.00%
504
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
448
0
90,645
0.500
45,323
0
0
0.00%
0.00%
0.00%
0
0
0
5,869
619
7,616,244
0.069
526,109
0
3,916
10.54%
0.00%
66.73%
52,401
0
203,037
5,869
25
7,616,244
0.069
526,109
0
30
0.42%
0.00%
0.51%
2,443
0
4,964
5,869
0
7,616,244
0.069
526,109
0
0
0.00%
0.00%
0.00%
0
0
0
5,869
0
7,616,244
0.069
526,109
0
0
0.00%
0.00%
0.00%
0
0
0
5,869
0
7,616,244
0.069
526,109
0
0
0.00%
0.00%
0.00%
0
0
0
5,869
0
7,616,244
0.069
526,109
0
0
0.00%
0.00%
0.00%
0
0
0
5,869
0
7,616,244
0.069
526,109
0
0
0.00%
0.00%
0.00%
0
0
0
5,869
0
7,616,244
0.069
526,109
0
0
0.00%
0.00%
0.00%
0
0
0
5,869
0
7,616,244
0.069
526,109
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
5,703
0
0.000
0
2,749
8,943
63.77%
30.74%
100.00%
0
0
0
8,943
1,601
0
0.000
0
0
5,498
17.90%
0.00%
61.48%
0
0
0
8,943
31
0
0.000
0
0
0
0.35%
0.00%
0.00%
0
0
0
8,943
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
8,943
0
0
0.000
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix E
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 114 of 114
December 2016

-------
Appendix F
National Extrapolation of Systems
and Population Served Predicted
To Have a Mean Concentration
Exceeding Thresholds
Appendix F
Six-Year Review 3
Technical Support Document for Nitrosamines Page 1 of 58
December 2016

-------
The UCMR 2 data set for nitrosamines includes data for 1,198 systems, 4,666 entry
point locations and 2,397 maximum residence time locations. A model was used to
generate estimates of NDMA occurrence. The purpose of the model was to estimate the
mean concentration of NDMA in the drinking water of each water system in UCMR,
heterogeneity across systems in their means, variability around those means and
uncertainty in those estimates. Appendix F provides a national extrapolation of systems
and population served by systems (broken down by source water type) predicted to
have a mean concentration exceeding the HRL and other thresholds. Tables are first
presented for all disinfectants, and then for chlorine (CL Only), chloramines (CA Only),
chloramines with other types of disinfectants (CA with CL-OT), chlorine with other types
of disinfectants (CL with OT), other types of disinfectants (OT Only) and no disinfectant
(ND Only).
Appendix F
Six-Year Review 3
Technical Support Document for Nitrosamines Page 2 of 58
December 2016

-------
F.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Number of UCMR
2 Systems with
Predicted Mean
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems with Predicted Mean
Exceeding Threshold
Percentage of
Systems with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of Systems
with Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
Systems with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Number of Systems with
Mean Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
480
41,962
81
64
104
6.45%
3.98%
10.03%
2,705
1,669
4,207
2
480
41,962
38
29
46
2.52%
1.30%
3.79%
1,056
546
1,591
6
480
41,962
17
14
22
0.99%
0.81%
1.15%
415
340
483
10
480
41,962
11
8
14
0.55%
0.34%
0.81%
229
143
340
20
480
41,962
7
5
8
0.31%
0.28%
0.34%
132
116
143
60
480
41,962
1
0
4
0.04%
0.00%
0.26%
18
0
107
100
480
41,962
0
0
1
0.00%
0.00%
0.02%
1
0
9
200
480
41,962
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
480
41,962
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
222
1,986
62
52
75
27.97%
23.27%
33.78%
555
462
671
2
222
1,986
29
25
34
13.21%
11.26%
15.32%
262
224
304
6
222
1,986
14
11
18
6.18%
4.95%
8.11%
123
98
161
10
222
1,986
9
7
11
3.97%
3.15%
4.95%
79
63
98
20
222
1,986
6
4
7
2.58%
1.80%
3.15%
51
36
63
60
222
1,986
1
0
3
0.47%
0.00%
1.35%
9
0
27
100
222
1,986
0
0
1
0.06%
0.00%
0.45%
1
0
9
200
222
1,986
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
222
1,986
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
240
38,525
8
3
15
3.18%
1.25%
6.25%
1,225
482
2,408
2
240
38,525
2
0
4
0.70%
0.00%
1.67%
270
0
642
6
240
38,525
0
0
0
0.01%
0.00%
0.00%
5
0
0
10
240
38,525
0
0
0
0.01%
0.00%
0.00%
2
0
0
20
240
38,525
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
240
38,525
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
240
38,525
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
240
38,525
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
240
38,525
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
18
1,451
11
9
14
63.73%
50.00%
77.78%
925
726
1,129
2
18
1,451
6
4
8
36.06%
22.22%
44.44%
523
322
645
6
18
1,451
4
3
4
19.83%
16.67%
22.22%
288
242
322
10
18
1,451
2
1
3
10.21%
5.56%
16.67%
148
81
242
20
18
1,451
1
1
1
5.56%
5.56%
5.56%
81
81
81
60
18
1,451
0
0
1
0.59%
0.00%
5.56%
9
0
81
100
18
1,451
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
18
1,451
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
18
1,451
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix F
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 3 of 58
December 2016

-------
F.l - All Disinfection Types
Total Population
Served by UCMR2
Systems
National
Population Served
by Systems
Population
Served by UCMR2
Systems with
Predicted Mean
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 Systems with Predicted
Mean Exceeding Threshold
Percent of
Population Served
by Systems with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by Systems with Predicted
Mean Exceeding Threshold - National
Extrapolation
Total Pop. Served
by Systems with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by
Systems with Mean Exceeding
Threshold - National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
1,208,921
41,154,840
270,675
204,440
342,225
11.87%
7.71%
18.54%
4,885,569
3,172,960
7,631,299
1,208,921
41,154,840
140,455
109,268
176,540
4.85%
2.65%
6.92%
1,995,203
1,092,084
2,846,984
1,208,921
41,154,840
68,534
43,234
100,917
1.83%
1.17%
2.54%
752,480
481,741
1,045,792
1,208,921
41,154,840
39,183
32,290
57,878
0.90%
0.64%
1.36%
370,659
265,049
559,561
1,208,921
41,154,840
25,828
16,532
32,290
0.56%
0.44%
0.64%
229,992
179,675
265,049
1,208,921
41,154,840
5,968
0
12,485
0.11%
0.00%
0.38%
44,000
0
155,965
1,208,921
41,154,840
920
0
6,600
0.01%
0.00%
0.09%
5,387
0
38,671
1,208,921
41,154,840
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,208,921
41,154,840
0
0
0
0.00%
0.00%
0.00%
0
0
0
573,691
5,030,810
196,179
156,489
231,909
28.21%
21.91%
35.25%
1,419,421
1,102,235
1,773,438
573,691
5,030,810
110,092
96,567
129,849
13.68%
11.79%
16.52%
688,144
593,039
831,056
573,691
5,030,810
58,052
36,143
88,216
6.87%
4.34%
10.87%
345,744
218,353
546,747
573,691
5,030,810
34,363
29,033
50,787
4.03%
3.23%
5.89%
202,528
162,714
296,173
573,691
5,030,810
22,571
13,275
29,033
2.54%
1.54%
3.23%
127,657
77,340
162,714
573,691
5,030,810
5,621
0
9,228
0.66%
0.00%
1.07%
33,077
0
53,630
573,691
5,030,810
920
0
6,600
0.11%
0.00%
0.77%
5,387
0
38,671
573,691
5,030,810
0
0
0
0.00%
0.00%
0.00%
0
0
0
573,691
5,030,810
0
0
0
0.00%
0.00%
0.00%
0
0
0
548,364
32,448,261
15,238
4,931
38,650
3.18%
0.75%
8.93%
1,033,058
243,863
2,898,059
548,364
32,448,261
3,186
0
5,921
0.48%
0.00%
0.87%
155,694
0
283,581
548,364
32,448,261
29
0
0
0.01%
0.00%
0.00%
2,112
0
0
548,364
32,448,261
1
0
0
0.00%
0.00%
0.00%
190
0
0
548,364
32,448,261
0
0
0
0.00%
0.00%
0.00%
0
0
0
548,364
32,448,261
0
0
0
0.00%
0.00%
0.00%
0
0
0
548,364
32,448,261
0
0
0
0.00%
0.00%
0.00%
0
0
0
548,364
32,448,261
0
0
0
0.00%
0.00%
0.00%
0
0
0
548,364
32,448,261
0
0
0
0.00%
0.00%
0.00%
0
0
0
86,866
3,675,769
59,258
43,020
71,665
66.19%
49.70%
80.52%
2,433,090
1,826,862
2,959,801
86,866
3,675,769
27,177
12,701
40,770
31.32%
13.58%
47.13%
1,151,365
499,045
1,732,348
86,866
3,675,769
10,453
7,091
12,701
11.01%
7.17%
13.58%
404,625
263,388
499,045
86,866
3,675,769
4,819
3,257
7,091
4.57%
2.78%
7.17%
167,941
102,335
263,388
86,866
3,675,769
3,257
3,257
3,257
2.78%
2.78%
2.78%
102,335
102,335
102,335
86,866
3,675,769
348
0
3,257
0.30%
0.00%
2.78%
10,923
0
102,335
86,866
3,675,769
0
0
0
0.00%
0.00%
0.00%
0
0
0
86,866
3,675,769
0
0
0
0.00%
0.00%
0.00%
0
0
0
86,866
3,675,769
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix F
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 4 of 58
December 2016

-------
F.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Number of UCMR
2 Systems with
Predicted Mean
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems with Predicted Mean
Exceeding Threshold
Percentage of
Systems with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of Systems
with Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
Systems with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Number of Systems with
Mean Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
All Systems
0.6
320
2,812
59
45
76
19.24%
14.50%
24.73%
541
408
695
2
320
2,812
25
19
32
7.88%
5.34%
10.53%
222
150
296
6
320
2,812
10
7
14
2.69%
2.06%
4.25%
76
58
120
10
320
2,812
5
2
8
1.29%
0.43%
2.34%
36
12
66
20
320
2,812
2
1
2
0.35%
0.22%
0.43%
10
6
12
60
320
2,812
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
320
2,812
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
320
2,812
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
320
2,812
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
120
732
38
31
46
31.98%
25.83%
38.63%
234
189
283
2
120
732
18
15
21
14.68%
12.50%
17.50%
107
92
128
6
120
732
8
6
10
6.46%
5.00%
8.33%
47
37
61
10
120
732
4
2
6
3.51%
1.67%
5.00%
26
12
37
20
120
732
2
1
2
1.30%
0.83%
1.67%
10
6
12
60
120
732
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
120
732
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
120
732
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
120
732
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
163
1,288
10
6
17
6.40%
3.68%
10.43%
82
47
134
2
163
1,288
3
2
5
1.96%
1.23%
3.07%
25
16
40
6
163
1,288
1
0
2
0.47%
0.00%
1.23%
6
0
16
10
163
1,288
0
0
1
0.05%
0.00%
0.61%
1
0
8
20
163
1,288
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
163
1,288
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
163
1,288
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
163
1,288
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
163
1,288
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
37
792
10
8
13
28.35%
21.62%
35.14%
225
171
278
2
37
792
4
2
6
11.22%
5.41%
16.22%
89
43
128
6
37
792
1
1
2
2.82%
2.70%
5.41%
22
21
43
10
37
792
0
0
1
1.25%
0.00%
2.70%
10
0
21
20
37
792
0
0
0
0.02%
0.00%
0.00%
0
0
0
60
37
792
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
37
792
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
37
792
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
37
792
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix F
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 5 of 58
December 2016

-------
F.l - All Disinfection Types
Total Population
Served by UCMR2
Systems
National
Population Served
by Systems
Population
Served by UCMR2
Systems with
Predicted Mean
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 Systems with Predicted
Mean Exceeding Threshold
Percent of
Population Served
by Systems with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by Systems with Predicted
Mean Exceeding Threshold - National
Extrapolation
Total Pop. Served
by Systems with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by
Systems with Mean Exceeding
Threshold - National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
14,029,015
84,318,927
2,957,844
2,312,882
3,786,707
21.03%
16.84%
26.83%
17,731,575
14,201,885
22,622,389
14,029,015
84,318,927
1,291,993
922,050
1,740,979
9.33%
6.21%
12.83%
7,866,335
5,235,856
10,817,716
14,029,015
84,318,927
424,999
311,357
725,823
2.67%
2.08%
5.24%
2,252,768
1,757,426
4,420,072
14,029,015
84,318,927
212,886
71,841
343,795
1.29%
0.32%
2.24%
1,089,538
273,214
1,884,592
14,029,015
84,318,927
49,175
13,601
71,841
0.23%
0.06%
0.32%
190,947
51,725
273,214
14,029,015
84,318,927
135
0
0
0.00%
0.00%
0.00%
512
0
0
14,029,015
84,318,927
0
0
0
0.00%
0.00%
0.00%
0
0
0
14,029,015
84,318,927
0
0
0
0.00%
0.00%
0.00%
0
0
0
14,029,015
84,318,927
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,187,934
24,488,354
1,823,853
1,482,030
2,184,678
32.17%
25.77%
39.11%
7,877,501
6,311,163
9,577,758
5,187,934
24,488,354
871,195
712,086
1,053,541
15.22%
12.45%
18.53%
3,727,884
3,048,236
4,536,684
5,187,934
24,488,354
339,976
257,357
515,859
6.09%
4.78%
9.12%
1,492,453
1,171,297
2,232,451
5,187,934
24,488,354
185,248
71,841
257,357
3.30%
1.12%
4.78%
807,996
273,214
1,171,297
5,187,934
24,488,354
48,770
13,601
71,841
0.76%
0.21%
1.12%
186,557
51,725
273,214
5,187,934
24,488,354
135
0
0
0.00%
0.00%
0.00%
512
0
0
5,187,934
24,488,354
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,187,934
24,488,354
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,187,934
24,488,354
0
0
0
0.00%
0.00%
0.00%
0
0
0
7,021,968
33,342,501
589,138
343,055
944,569
7.43%
4.33%
11.75%
2,478,155
1,442,860
3,917,528
7,021,968
33,342,501
143,399
65,118
302,392
1.71%
0.77%
3.85%
570,148
255,280
1,283,450
7,021,968
33,342,501
26,457
0
65,118
0.31%
0.00%
0.77%
103,718
0
255,280
7,021,968
33,342,501
2,661
0
32,438
0.03%
0.00%
0.38%
10,430
0
127,165
7,021,968
33,342,501
0
0
0
0.00%
0.00%
0.00%
0
0
0
7,021,968
33,342,501
0
0
0
0.00%
0.00%
0.00%
0
0
0
7,021,968
33,342,501
0
0
0
0.00%
0.00%
0.00%
0
0
0
7,021,968
33,342,501
0
0
0
0.00%
0.00%
0.00%
0
0
0
7,021,968
33,342,501
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,819,112
26,488,072
544,854
487,797
657,460
27.85%
24.34%
34.46%
7,375,918
6,447,862
9,127,103
1,819,112
26,488,072
277,399
144,846
385,046
13.47%
7.30%
18.87%
3,568,303
1,932,341
4,997,581
1,819,112
26,488,072
58,566
54,000
144,846
2.48%
2.21%
7.30%
656,596
586,129
1,932,341
1,819,112
26,488,072
24,978
0
54,000
1.02%
0.00%
2.21%
271,112
0
586,129
1,819,112
26,488,072
404
0
0
0.02%
0.00%
0.00%
4,390
0
0
1,819,112
26,488,072
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,819,112
26,488,072
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,819,112
26,488,072
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,819,112
26,488,072
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix F
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 6 of 58
December 2016

-------
F.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Number of UCMR
2 Systems with
Predicted Mean
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems with Predicted Mean
Exceeding Threshold
Percentage of
Systems with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of Systems
with Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
Systems with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Number of Systems with
Mean Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All Systems
0.6
398
398
121
101
145
30.47%
25.38%
36.43%
121
101
145
2
398
398
46
37
55
11.65%
9.30%
13.82%
46
37
55
6
398
398
14
10
17
3.51%
2.51%
4.27%
14
10
17
10
398
398
6
4
9
1.51%
1.01%
2.35%
6
4
9
20
398
398
2
1
3
0.44%
0.25%
0.75%
2
1
3
60
398
398
1
0
1
0.14%
0.00%
0.25%
1
0
1
100
398
398
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
398
398
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
398
398
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
218
218
81
70
95
37.16%
32.11%
43.58%
81
70
95
2
218
218
35
30
40
16.12%
13.76%
18.35%
35
30
40
6
218
218
13
10
15
5.99%
4.59%
6.88%
13
10
15
10
218
218
6
4
9
2.76%
1.83%
4.29%
6
4
9
20
218
218
2
1
3
0.81%
0.46%
1.38%
2
1
3
60
218
218
1
0
1
0.25%
0.00%
0.46%
1
0
1
100
218
218
0
0
0
0.01%
0.00%
0.00%
0
0
0
200
218
218
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
218
218
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
72
72
8
5
12
11.54%
6.94%
16.67%
8
5
12
2
72
72
2
1
3
2.90%
1.39%
4.17%
2
1
3
6
72
72
0
0
0
0.02%
0.00%
0.00%
0
0
0
10
72
72
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
72
72
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
72
72
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
72
72
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
72
72
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
72
72
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
108
108
32
26
38
29.60%
24.07%
35.19%
32
26
38
2
108
108
9
6
12
8.48%
5.56%
11.11%
9
6
12
6
108
108
1
0
2
0.81%
0.00%
1.85%
1
0
2
10
108
108
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
108
108
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
108
108
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
108
108
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
108
108
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
108
108
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix F
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 7 of 58
December 2016

-------
F.l - All Disinfection Types
Total Population
Served by UCMR2
Systems
National
Population Served
by Systems
Population
Served by UCMR2
Systems with
Predicted Mean
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 Systems with Predicted
Mean Exceeding Threshold
Percent of
Population Served
by Systems with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by Systems with Predicted
Mean Exceeding Threshold - National
Extrapolation
Total Pop. Served
by Systems with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by
Systems with Mean Exceeding
Threshold - National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
141,981,684
141,981,684
42,734,267
32,742,467
54,906,687
30.10%
23.06%
38.67%
42,734,267
32,742,467
54,906,687
141,981,684
141,981,684
14,892,932
12,187,487
18,796,017
10.49%
8.58%
13.24%
14,892,932
12,187,487
18,796,017
141,981,684
141,981,684
3,168,706
2,231,047
3,966,754
2.23%
1.57%
2.79%
3,168,706
2,231,047
3,966,754
141,981,684
141,981,684
1,499,570
995,593
2,254,939
1.06%
0.70%
1.59%
1,499,570
995,593
2,254,939
141,981,684
141,981,684
448,154
101,883
995,593
0.32%
0.07%
0.70%
448,154
101,883
995,593
141,981,684
141,981,684
55,139
0
101,883
0.04%
0.00%
0.07%
55,139
0
101,883
141,981,684
141,981,684
1,526
0
0
0.00%
0.00%
0.00%
1,526
0
0
141,981,684
141,981,684
0
0
0
0.00%
0.00%
0.00%
0
0
0
141,981,684
141,981,684
0
0
0
0.00%
0.00%
0.00%
0
0
0
89,237,751
89,237,751
30,756,923
24,060,389
39,205,735
34.47%
26.96%
43.93%
30,756,923
24,060,389
39,205,735
89,237,751
89,237,751
10,257,770
8,180,244
13,600,230
11.49%
9.17%
15.24%
10,257,770
8,180,244
13,600,230
89,237,751
89,237,751
3,023,710
2,231,047
3,658,280
3.39%
2.50%
4.10%
3,023,710
2,231,047
3,658,280
89,237,751
89,237,751
1,499,570
995,593
2,254,939
1.68%
1.12%
2.53%
1,499,570
995,593
2,254,939
89,237,751
89,237,751
448,154
101,883
995,593
0.50%
0.11%
1.12%
448,154
101,883
995,593
89,237,751
89,237,751
55,139
0
101,883
0.06%
0.00%
0.11%
55,139
0
101,883
89,237,751
89,237,751
1,526
0
0
0.00%
0.00%
0.00%
1,526
0
0
89,237,751
89,237,751
0
0
0
0.00%
0.00%
0.00%
0
0
0
89,237,751
89,237,751
0
0
0
0.00%
0.00%
0.00%
0
0
0
18,472,835
18,472,835
2,556,339
1,060,668
4,487,732
13.84%
5.74%
24.29%
2,556,339
1,060,668
4,487,732
18,472,835
18,472,835
359,613
133,846
522,963
1.95%
0.72%
2.83%
359,613
133,846
522,963
18,472,835
18,472,835
3,599
0
0
0.02%
0.00%
0.00%
3,599
0
0
18,472,835
18,472,835
0
0
0
0.00%
0.00%
0.00%
0
0
0
18,472,835
18,472,835
0
0
0
0.00%
0.00%
0.00%
0
0
0
18,472,835
18,472,835
0
0
0
0.00%
0.00%
0.00%
0
0
0
18,472,835
18,472,835
0
0
0
0.00%
0.00%
0.00%
0
0
0
18,472,835
18,472,835
0
0
0
0.00%
0.00%
0.00%
0
0
0
18,472,835
18,472,835
0
0
0
0.00%
0.00%
0.00%
0
0
0
34,271,098
34,271,098
9,421,004
7,621,411
11,213,220
27.49%
22.24%
32.72%
9,421,004
7,621,411
11,213,220
34,271,098
34,271,098
4,275,549
3,873,397
4,672,825
12.48%
11.30%
13.63%
4,275,549
3,873,397
4,672,825
34,271,098
34,271,098
141,397
0
308,475
0.41%
0.00%
0.90%
141,397
0
308,475
34,271,098
34,271,098
0
0
0
0.00%
0.00%
0.00%
0
0
0
34,271,098
34,271,098
0
0
0
0.00%
0.00%
0.00%
0
0
0
34,271,098
34,271,098
0
0
0
0.00%
0.00%
0.00%
0
0
0
34,271,098
34,271,098
0
0
0
0.00%
0.00%
0.00%
0
0
0
34,271,098
34,271,098
0
0
0
0.00%
0.00%
0.00%
0
0
0
34,271,098
34,271,098
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix F
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 8 of 58
December 2016

-------
F.l - All Disinfection Types
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Number of UCMR
2 Systems with
Predicted Mean
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems with Predicted Mean
Exceeding Threshold
Percentage of
Systems with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of Systems
with Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
Systems with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Number of Systems with
Mean Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
All Systems
0.6
1,198
45,172
262
210
325
7.45%
4.82%
11.17%
3,367
2,178
5,048
2
1,198
45,172
109
85
133
2.93%
1.62%
4.30%
1,324
733
1,942
6
1,198
45,172
41
31
53
1.12%
0.90%
1.37%
505
408
620
10
1,198
45,172
21
14
31
0.60%
0.35%
0.92%
271
159
416
20
1,198
45,172
10
7
13
0.32%
0.27%
0.35%
143
123
158
60
1,198
45,172
2
0
5
0.04%
0.00%
0.24%
19
0
108
100
1,198
45,172
0
0
1
0.00%
0.00%
0.02%
1
0
9
200
1,198
45,172
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
1,198
45,172
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
560
2,936
181
153
216
29.65%
24.56%
35.72%
871
721
1,049
2
560
2,936
82
70
95
13.79%
11.76%
16.09%
405
345
472
6
560
2,936
35
27
43
6.23%
4.94%
8.07%
183
145
237
10
560
2,936
19
13
26
3.76%
2.68%
4.92%
110
79
144
20
560
2,936
9
6
12
2.13%
1.46%
2.65%
62
43
78
60
560
2,936
2
0
4
0.34%
0.00%
0.95%
10
0
28
100
560
2,936
0
0
1
0.04%
0.00%
0.30%
1
0
9
200
560
2,936
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
560
2,936
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
475
39,885
26
14
44
3.30%
1.34%
6.40%
1,315
534
2,554
2
475
39,885
7
3
12
0.75%
0.04%
1.72%
298
17
685
6
475
39,885
1
0
2
0.03%
0.00%
0.04%
11
0
16
10
475
39,885
0
0
1
0.01%
0.00%
0.02%
3
0
8
20
475
39,885
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
475
39,885
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
475
39,885
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
475
39,885
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
475
39,885
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
163
2,351
54
43
65
50.25%
39.25%
61.46%
1,181
923
1,445
2
163
2,351
20
12
26
26.42%
15.79%
33.40%
621
371
785
6
163
2,351
5
4
8
13.23%
11.20%
15.62%
311
263
367
10
163
2,351
2
1
4
6.72%
3.43%
11.20%
158
81
263
20
163
2,351
1
1
1
3.44%
3.43%
3.43%
81
81
81
60
163
2,351
0
0
1
0.37%
0.00%
3.43%
9
0
81
100
163
2,351
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
163
2,351
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
163
2,351
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix F
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 9 of 58
December 2016

-------
F.l - All Disinfection Types
Total Population
Served by UCMR2
Systems
National
Population Served
by Systems
Population
Served by UCMR2
Systems with
Predicted Mean
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 Systems with Predicted
Mean Exceeding Threshold
Percent of
Population Served
by Systems with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by Systems with Predicted
Mean Exceeding Threshold - National
Extrapolation
Total Pop. Served
by Systems with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by
Systems with Mean Exceeding
Threshold - National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
ALL SYSTEMS
157,219,620
267,455,451
45,962,786
35,259,790
59,035,619
24.43%
18.74%
31.84%
65,351,410
50,117,312
85,160,375
157,219,620
267,455,451
16,325,379
13,218,804
20,713,536
9.26%
6.92%
12.14%
24,754,470
18,515,427
32,460,717
157,219,620
267,455,451
3,662,240
2,585,638
4,793,493
2.31%
1.67%
3.53%
6,173,954
4,470,214
9,432,618
157,219,620
267,455,451
1,751,639
1,099,724
2,656,612
1.11%
0.57%
1.76%
2,959,767
1,533,856
4,699,092
157,219,620
267,455,451
523,157
132,016
1,099,724
0.32%
0.12%
0.57%
869,094
333,284
1,533,856
157,219,620
267,455,451
61,242
0
114,368
0.04%
0.00%
0.10%
99,651
0
257,848
157,219,620
267,455,451
2,446
0
6,600
0.00%
0.00%
0.01%
6,913
0
38,671
157,219,620
267,455,451
0
0
0
0.00%
0.00%
0.00%
0
0
0
157,219,620
267,455,451
0
0
0
0.00%
0.00%
0.00%
0
0
0
94,999,376
118,756,915
32,776,955
25,698,909
41,622,322
33.73%
26.50%
42.57%
40,053,846
31,473,787
50,556,931
94,999,376
118,756,915
11,239,057
8,988,896
14,783,619
12.36%
9.95%
15.97%
14,673,799
11,821,519
18,967,970
94,999,376
118,756,915
3,421,738
2,524,547
4,262,354
4.09%
3.05%
5.42%
4,861,907
3,620,697
6,437,478
94,999,376
118,756,915
1,719,181
1,096,467
2,563,083
2.11%
1.21%
3.13%
2,510,094
1,431,521
3,722,410
94,999,376
118,756,915
519,496
128,759
1,096,467
0.64%
0.19%
1.21%
762,369
230,949
1,431,521
94,999,376
118,756,915
60,894
0
111,111
0.07%
0.00%
0.13%
88,727
0
155,513
94,999,376
118,756,915
2,446
0
6,600
0.01%
0.00%
0.03%
6,913
0
38,671
94,999,376
118,756,915
0
0
0
0.00%
0.00%
0.00%
0
0
0
94,999,376
118,756,915
0
0
0
0.00%
0.00%
0.00%
0
0
0
26,043,167
84,263,597
3,160,715
1,408,654
5,470,951
7.20%
3.26%
13.41%
6,067,552
2,747,390
11,303,319
26,043,167
84,263,597
506,198
198,964
831,276
1.29%
0.46%
2.48%
1,085,454
389,126
2,089,993
26,043,167
84,263,597
30,085
0
65,118
0.13%
0.00%
0.30%
109,429
0
255,280
26,043,167
84,263,597
2,662
0
32,438
0.01%
0.00%
0.15%
10,620
0
127,165
26,043,167
84,263,597
0
0
0
0.00%
0.00%
0.00%
0
0
0
26,043,167
84,263,597
0
0
0
0.00%
0.00%
0.00%
0
0
0
26,043,167
84,263,597
0
0
0
0.00%
0.00%
0.00%
0
0
0
26,043,167
84,263,597
0
0
0
0.00%
0.00%
0.00%
0
0
0
26,043,167
84,263,597
0
0
0
0.00%
0.00%
0.00%
0
0
0
36,177,076
64,434,939
10,025,116
8,152,228
11,942,345
29.84%
24.67%
36.16%
19,230,013
15,896,135
23,300,125
36,177,076
64,434,939
4,580,124
4,030,944
5,098,641
13.96%
9.78%
17.70%
8,995,217
6,304,782
11,402,754
36,177,076
64,434,939
210,416
61,091
466,022
1.87%
1.32%
4.25%
1,202,618
849,517
2,739,860
36,177,076
64,434,939
29,796
3,257
61,091
0.68%
0.16%
1.32%
439,053
102,335
849,517
36,177,076
64,434,939
3,661
3,257
3,257
0.17%
0.16%
0.16%
106,726
102,335
102,335
36,177,076
64,434,939
348
0
3,257
0.02%
0.00%
0.16%
10,923
0
102,335
36,177,076
64,434,939
0
0
0
0.00%
0.00%
0.00%
0
0
0
36,177,076
64,434,939
0
0
0
0.00%
0.00%
0.00%
0
0
0
36,177,076
64,434,939
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix F
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 10 of 58
December 2016

-------
F.2-CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Number of UCMR
2 Systems with
Predicted Mean
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems with Predicted Mean
Exceeding Threshold
Percentage of
Systems with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of Systems
with Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
Systems with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Number of Systems with
Mean Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
All Systems
0.6
378
31,621
41
31
55
3.14%
1.57%
5.34%
993
497
1,688
2
378
31,621
10
7
13
0.67%
0.20%
1.07%
211
63
340
6
378
31,621
2
2
4
0.07%
0.06%
0.11%
22
18
36
10
378
31,621
2
1
2
0.05%
0.03%
0.06%
15
9
18
20
378
31,621
1
1
1
0.03%
0.03%
0.03%
9
9
9
60
378
31,621
0
0
1
0.00%
0.00%
0.03%
1
0
9
100
378
31,621
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
378
31,621
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
378
31,621
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
188
1,682
36
29
45
19.05%
15.24%
23.94%
320
256
403
2
188
1,682
9
7
11
4.81%
3.72%
5.85%
81
63
98
6
188
1,682
2
2
4
1.33%
1.06%
2.13%
22
18
36
10
188
1,682
2
1
2
0.87%
0.53%
1.06%
15
9
18
20
188
1,682
1
1
1
0.54%
0.53%
0.53%
9
9
9
60
188
1,682
0
0
1
0.09%
0.00%
0.53%
1
0
9
100
188
1,682
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
188
1,682
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
188
1,682
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
183
29,375
3
1
6
1.72%
0.55%
3.28%
506
161
963
2
183
29,375
0
0
1
0.20%
0.00%
0.55%
60
0
161
6
183
29,375
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
183
29,375
0
0
0
0.00%
0.00%
0.00%
1
0
0
20
183
29,375
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
183
29,375
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
183
29,375
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
183
29,375
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
183
29,375
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
7
564
2
1
4
29.61%
14.29%
57.14%
167
81
322
2
7
564
1
0
1
12.44%
0.00%
14.29%
70
0
81
6
7
564
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
7
564
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
7
564
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
7
564
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
7
564
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
7
564
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
7
564
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix F
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 11 of 58
December 2016

-------
F.2-CL Only
Total Population
Served by UCMR2
Systems
National
Population Served
by Systems
Population
Served by UCMR2
Systems with
Predicted Mean
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 Systems with Predicted
Mean Exceeding Threshold
Percent of
Population Served
by Systems with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by Systems with Predicted
Mean Exceeding Threshold - National
Extrapolation
Total Pop. Served
by Systems with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by
Systems with Mean Exceeding
Threshold - National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
SMALL SYSTEMS (Serving < 10,000)
960,847
30,431,590
103,428
70,517
145,825
5.63%
7.34%
15.18%
1,712,213
974,505
2,768,895
960,847
30,431,590
30,013
18,127
39,618
1.76%
1.89%
4.12%
535,583
173,726
678,371
960,847
30,431,590
7,064
4,406
16,967
0.22%
0.46%
1.77%
67,698
42,226
162,609
960,847
30,431,590
2,996
456
4,406
0.09%
0.05%
0.46%
28,718
4,370
42,226
960,847
30,431,590
500
456
456
0.02%
0.05%
0.05%
4,796
4,370
4,370
960,847
30,431,590
74
0
456
0.00%
0.00%
0.05%
712
0
4,370
960,847
30,431,590
1
0
0
0.00%
0.00%
0.00%
8
0
0
960,847
30,431,590
0
0
0
0.00%
0.00%
0.00%
0
0
0
960,847
30,431,590
0
0
0
0.00%
0.00%
0.00%
0
0
0
444,532
4,260,326
85,753
63,172
112,246
19.29%
14.21%
25.25%
821,848
605,430
1,075,749
444,532
4,260,326
23,913
18,127
32,273
5.38%
4.08%
7.26%
229,174
173,726
309,295
444,532
4,260,326
7,064
4,406
16,967
1.59%
0.99%
3.82%
67,698
42,226
162,609
444,532
4,260,326
2,996
456
4,406
0.67%
0.10%
0.99%
28,718
4,370
42,226
444,532
4,260,326
500
456
456
0.11%
0.10%
0.10%
4,796
4,370
4,370
444,532
4,260,326
74
0
456
0.02%
0.00%
0.10%
712
0
4,370
444,532
4,260,326
1
0
0
0.00%
0.00%
0.00%
8
0
0
444,532
4,260,326
0
0
0
0.00%
0.00%
0.00%
0
0
0
444,532
4,260,326
0
0
0
0.00%
0.00%
0.00%
0
0
0
487,838
24,741,799
6,065
725
14,555
1.24%
0.15%
2.98%
307,587
36,770
738,195
487,838
24,741,799
359
0
725
0.07%
0.00%
0.15%
18,192
0
36,770
487,838
24,741,799
0
0
0
0.00%
0.00%
0.00%
0
0
0
487,838
24,741,799
0
0
0
0.00%
0.00%
0.00%
0
0
0
487,838
24,741,799
0
0
0
0.00%
0.00%
0.00%
0
0
0
487,838
24,741,799
0
0
0
0.00%
0.00%
0.00%
0
0
0
487,838
24,741,799
0
0
0
0.00%
0.00%
0.00%
0
0
0
487,838
24,741,799
0
0
0
0.00%
0.00%
0.00%
0
0
0
487,838
24,741,799
0
0
0
0.00%
0.00%
0.00%
0
0
0
28,477
1,429,466
11,610
6,620
19,024
40.77%
23.25%
66.80%
582,778
332,305
954,952
28,477
1,429,466
5,742
0
6,620
20.16%
0.00%
23.25%
288,217
0
332,305
28,477
1,429,466
0
0
0
0.00%
0.00%
0.00%
0
0
0
28,477
1,429,466
0
0
0
0.00%
0.00%
0.00%
0
0
0
28,477
1,429,466
0
0
0
0.00%
0.00%
0.00%
0
0
0
28,477
1,429,466
0
0
0
0.00%
0.00%
0.00%
0
0
0
28,477
1,429,466
0
0
0
0.00%
0.00%
0.00%
0
0
0
28,477
1,429,466
0
0
0
0.00%
0.00%
0.00%
0
0
0
28,477
1,429,466
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix F
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 12 of 58
December 2016

-------
F.2-CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Number of UCMR
2 Systems with
Predicted Mean
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems with Predicted Mean
Exceeding Threshold
Percentage of
Systems with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of Systems
with Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
Systems with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Number of Systems with
Mean Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
All Systems
0.6
240
2,081
19
12
26
8.10%
5.08%
11.65%
169
106
242
2
240
2,081
5
4
8
2.75%
1.91%
3.90%
57
40
81
6
240
2,081
0
0
2
0.10%
0.00%
1.32%
2
0
28
10
240
2,081
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
240
2,081
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
240
2,081
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
240
2,081
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
240
2,081
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
240
2,081
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
85
519
13
9
17
15.10%
10.59%
20.00%
78
55
104
2
85
519
4
3
5
4.38%
3.53%
5.88%
23
18
31
6
85
519
0
0
1
0.18%
0.00%
1.18%
1
0
6
10
85
519
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
85
519
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
85
519
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
85
519
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
85
519
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
85
519
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
130
1,027
2
1
4
1.78%
0.77%
3.08%
18
8
32
2
130
1,027
0
0
1
0.06%
0.00%
0.77%
1
0
8
6
130
1,027
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
130
1,027
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
130
1,027
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
130
1,027
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
130
1,027
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
130
1,027
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
130
1,027
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
25
535
3
2
5
13.46%
8.00%
20.00%
72
43
107
2
25
535
2
1
2
6.32%
4.00%
8.00%
34
21
43
6
25
535
0
0
1
0.23%
0.00%
4.00%
1
0
21
10
25
535
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
25
535
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
25
535
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
25
535
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
25
535
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
25
535
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix F
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 13 of 58
December 2016

-------
F.2-CL Only
Total Population
Served by UCMR2
Systems
National
Population Served
by Systems
Population
Served by UCMR2
Systems with
Predicted Mean
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 Systems with Predicted
Mean Exceeding Threshold
Percent of
Population Served
by Systems with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by Systems with Predicted
Mean Exceeding Threshold - National
Extrapolation
Total Pop. Served
by Systems with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by
Systems with Mean Exceeding
Threshold - National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
LARGE SYSTEMS (Serving 10,001 -100,000)
9,965,053
61,835,442
840,520
581,625
1,175,825
9.21%
5.84%
11.80%
5,692,511
4,088,259
8,098,195
9,965,053
61,835,442
283,397
204,348
470,178
4.00%
2.05%
4.72%
2,472,580
1,925,449
3,519,507
9,965,053
61,835,442
14,226
0
150,880
0.20%
0.00%
1.51%
123,836
0
1,652,584
9,965,053
61,835,442
0
0
0
0.00%
0.00%
0.00%
0
0
0
9,965,053
61,835,442
0
0
0
0.00%
0.00%
0.00%
0
0
0
9,965,053
61,835,442
0
0
0
0.00%
0.00%
0.00%
0
0
0
9,965,053
61,835,442
0
0
0
0.00%
0.00%
0.00%
0
0
0
9,965,053
61,835,442
0
0
0
0.00%
0.00%
0.00%
0
0
0
9,965,053
61,835,442
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,398,940
17,345,917
531,420
370,979
706,360
15.63%
10.91%
20.78%
2,712,012
1,893,228
3,604,790
3,398,940
17,345,917
169,901
113,502
259,532
5.00%
3.34%
7.64%
867,060
579,237
1,324,476
3,398,940
17,345,917
8,952
0
60,034
0.26%
0.00%
1.77%
45,685
0
306,372
3,398,940
17,345,917
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,398,940
17,345,917
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,398,940
17,345,917
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,398,940
17,345,917
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,398,940
17,345,917
0
0
0
0.00%
0.00%
0.00%
0
0
0
3,398,940
17,345,917
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,358,353
26,592,179
162,333
94,000
249,944
3.03%
1.75%
4.66%
805,620
466,499
1,240,408
5,358,353
26,592,179
7,745
0
94,000
0.14%
0.00%
1.75%
38,438
0
466,499
5,358,353
26,592,179
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,358,353
26,592,179
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,358,353
26,592,179
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,358,353
26,592,179
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,358,353
26,592,179
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,358,353
26,592,179
0
0
0
0.00%
0.00%
0.00%
0
0
0
5,358,353
26,592,179
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,207,761
17,897,346
146,767
116,646
219,521
12.15%
9.66%
18.18%
2,174,879
1,728,532
3,252,997
1,207,761
17,897,346
105,751
90,846
116,646
8.76%
7.52%
9.66%
1,567,082
1,346,212
1,728,532
1,207,761
17,897,346
5,274
0
90,846
0.44%
0.00%
7.52%
78,151
0
1,346,212
1,207,761
17,897,346
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,207,761
17,897,346
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,207,761
17,897,346
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,207,761
17,897,346
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,207,761
17,897,346
0
0
0
0.00%
0.00%
0.00%
0
0
0
1,207,761
17,897,346
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix F
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 14 of 58
December 2016

-------
F.2-CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Number of UCMR
2 Systems with
Predicted Mean
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems with Predicted Mean
Exceeding Threshold
Percentage of
Systems with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of Systems
with Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
Systems with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Number of Systems with
Mean Exceeding Threshold - National
Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
All Systems
0.6
207
207
14
9
20
6.65%
4.35%
9.66%
14
9
20
2
207
207
5
3
7
2.41%
1.45%
3.38%
5
3
7
6
207
207
2
1
3
1.19%
0.48%
1.45%
2
1
3
10
207
207
0
0
1
0.22%
0.00%
0.65%
0
0
1
20
207
207
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
207
207
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
207
207
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
207
207
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
207
207
0
0
0
0.00%
0.00%
0.00%
0
0
0
Surface Water
Systems
0.6
110
110
9
6
13
8.18%
5.45%
11.82%
9
6
13
2
110
110
3
2
4
2.50%
1.82%
3.64%
3
2
4
6
110
110
2
1
2
1.72%
0.91%
1.82%
2
1
2
10
110
110
0
0
1
0.41%
0.00%
1.23%
0
0
1
20
110
110
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
110
110
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
110
110
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
110
110
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
110
110
0
0
0
0.00%
0.00%
0.00%
0
0
0
Ground Water
Systems
0.6
45
45
0
0
1
0.65%
0.00%
2.22%
0
0
1
2
45
45
0
0
0
0.00%
0.00%
0.00%
0
0
0
6
45
45
0
0
0
0.00%
0.00%
0.00%
0
0
0
10
45
45
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
45
45
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
45
45
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
45
45
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
45
45
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
45
45
0
0
0
0.00%
0.00%
0.00%
0
0
0
Mixed Water
Systems
0.6
52
52
4
3
6
8.59%
5.77%
11.54%
4
3
6
2
52
52
2
1
3
4.29%
1.92%
5.77%
2
1
3
6
52
52
1
0
1
1.09%
0.00%
1.92%
1
0
1
10
52
52
0
0
0
0.00%
0.00%
0.00%
0
0
0
20
52
52
0
0
0
0.00%
0.00%
0.00%
0
0
0
60
52
52
0
0
0
0.00%
0.00%
0.00%
0
0
0
100
52
52
0
0
0
0.00%
0.00%
0.00%
0
0
0
200
52
52
0
0
0
0.00%
0.00%
0.00%
0
0
0
600
52
52
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix F
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 15 of 58
December 2016

-------
F.2-CL Only
Total Population
Served by UCMR2
Systems
National
Population Served
by Systems
Population
Served by UCMR2
Systems with
Predicted Mean
Exceeding
Threshold
90% CI on Population Served by
UCMR 2 Systems with Predicted
Mean Exceeding Threshold
Percent of
Population Served
by Systems with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percent of Population
Served by Systems with Predicted
Mean Exceeding Threshold - National
Extrapolation
Total Pop. Served
by Systems with
Mean Exceeding
Threshold -
National
Extrapolation
90% CI on Total Pop. Served by
Systems with Mean Exceeding
Threshold - National Extrapolation
Lower Bound
Upper Bound
Lower Bound
Upper Bound
Lower Bound
Upper Bound
VERY LARGE SYSTEMS (Serving > 100,000)
70,477,886
70,477,886
5,512,530
3,949,348
7,858,169
7.82%
5.60%
11.15%
5,512,530
3,949,348
7,858,169
70,477,886
70,477,886
1,294,791
538,357
3,207,573
1.84%
0.76%
4.55%
1,294,791
538,357
3,207,573
70,477,886
70,477,886
446,561
122,888
538,357
0.63%
0.17%
0.76%
446,561
122,888
538,357
70,477,886
70,477,886
90,322
0
301,780
0.13%
0.00%
0.43%
90,322
0
301,780
70,477,886
70,477,886
0
0
0
0.00%
0.00%
0.00%
0
0
0
70,477,886
70,477,886
0
0
0
0.00%
0.00%
0.00%
0
0
0
70,477,886
70,477,886
0
0
0
0.00%
0.00%
0.00%
0
0
0
70,477,886
70,477,886
0
0
0
0.00%
0.00%
0.00%
0
0
0
70,477,886
70,477,886
0
0
0
0.00%
0.00%
0.00%
0
0
0
41,269,868
41,269,868
4,610,877
3,579,656
6,409,109
11.17%
8.67%
15.53%
4,610,877
3,579,656
6,409,109
41,269,868
41,269,868
1,005,619
381,657
2,837,881
2.44%
0.92%
6.88%
1,005,619
381,657
2,837,881
41,269,868
41,269,868
357,647
122,888
381,657
0.87%
0.30%
0.92%
357,647
122,888
381,657
41,269,868
41,269,868
90,322
0
301,780
0.22%
0.00%
0.73%
90,322
0
301,780
41,269,868
41,269,868
0
0
0
0.00%
0.00%
0.00%
0
0
0
41,269,868
41,269,868
0
0
0
0.00%
0.00%
0.00%
0
0
0
41,269,868
41,269,868
0
0
0
0.00%
0.00%
0.00%
0
0
0
41,269,868
41,269,868
0
0
0
0.00%
0.00%
0.00%
0
0
0
41,269,868
41,269,868
0
0
0
0.00%
0.00%
0.00%
0
0
0
11,230,816
11,230,816
45,596
0
205,291
0.41%
0.00%
1.83%
45,596
0
205,291
11,230,816
11,230,816
0
0
0
0.00%
0.00%
0.00%
0
0
0
11,230,816
11,230,816
0
0
0
0.00%
0.00%
0.00%
0
0
0
11,230,816
11,230,816
0
0
0
0.00%
0.00%
0.00%
0
0
0
11,230,816
11,230,816
0
0
0
0.00%
0.00%
0.00%
0
0
0
11,230,816
11,230,816
0
0
0
0.00%
0.00%
0.00%
0
0
0
11,230,816
11,230,816
0
0
0
0.00%
0.00%
0.00%
0
0
0
11,230,816
11,230,816
0
0
0
0.00%
0.00%
0.00%
0
0
0
11,230,816
11,230,816
0
0
0
0.00%
0.00%
0.00%
0
0
0
17,977,203
17,977,203
856,057
369,692
1,243,769
4.76%
2.06%
6.92%
856,057
369,692
1,243,769
17,977,203
17,977,203
289,173
156,700
369,692
1.61%
0.87%
2.06%
289,173
156,700
369,692
17,977,203
17,977,203
88,914
0
156,700
0.49%
0.00%
0.87%
88,914
0
156,700
17,977,203
17,977,203
0
0
0
0.00%
0.00%
0.00%
0
0
0
17,977,203
17,977,203
0
0
0
0.00%
0.00%
0.00%
0
0
0
17,977,203
17,977,203
0
0
0
0.00%
0.00%
0.00%
0
0
0
17,977,203
17,977,203
0
0
0
0.00%
0.00%
0.00%
0
0
0
17,977,203
17,977,203
0
0
0
0.00%
0.00%
0.00%
0
0
0
17,977,203
17,977,203
0
0
0
0.00%
0.00%
0.00%
0
0
0
Appendix F
Six-Year Review 3 Technical Support Document for Nitrosamines
Page 16 of 58
December 2016

-------
F.2-CL Only
Source Water Type
Threshold
(ng/L)
Total
Number of
UCMR2
Systems
National
Number of
Systems
Number of UCMR
2 Systems with
Predicted Mean
Exceeding
Threshold
90% CI on Number of UCMR 2
Systems with Predicted Mean
Exceeding Threshold
Percentage of
Systems with
Predicted Mean
Exceeding
Threshold -
National
Extrapolation
90% CI on Percentage of Systems
with Predicted Mean Exceeding
Threshold - National Extrapolation
Total Number of
Systems with
Mean Exceeding
Threshold -
National
Extrapolatio