Appendices to the Six-Year Review 3 Technical Support Document for Nitrosamines December 2016 EPA-810-R-16-009 ------- Appendix A Non-UCMR 2 Occurrence in Ambient Water and Drinking Water Appendix A Six-Year Review 3 Technical Support Document for Nitrosamines Page 1 of 13 December 2016 ------- 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 Six-Year Review 3 Technical Support Document for Nitrosamines Page 2 of 13 December 2016 ------- 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 Six-Year Review 3 Technical Support Document for Nitrosamines Page 3 of 13 December 2016 ------- 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 Six-Year Review 3 Technical Support Document for Nitrosamines Page 4 of 13 December 2016 ------- 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 Six-Year Review 3 Technical Support Document for Nitrosamines Page 5 of 13 December 2016 ------- 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 Six-Year Review 3 Technical Support Document for Nitrosamines Page 6 of 13 December 2016 ------- 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 Six-Year Review 3 Technical Support Document for Nitrosamines Page 7 of 13 December 2016 ------- 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 Six-Year Review 3 Technical Support Document for Nitrosamines Page 8 of 13 December 2016 ------- 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 Six-Year Review 3 Technical Support Document for Nitrosamines Page 9 of 13 December 2016 ------- 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 Six-Year Review 3 Technical Support Document for Nitrosamines Page 10 of 13 December 2016 ------- 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 ------- 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 ------- 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 ------- 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 ------- 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 ------- 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 ------- 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 ------- 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 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 0.6 825 33,909 73 52 101 8.89% 6.26% 12.24% 1,176 612 1,950 2 825 33,909 21 14 28 2.50% 1.70% 3.39% 273 105 428 6 825 33,909 5 3 9 0.63% 0.36% 1.09% 27 19 66 10 825 33,909 2 1 3 0.25% 0.12% 0.41% 16 9 19 20 825 33,909 1 1 1 0.12% 0.12% 0.12% 9 9 9 60 825 33,909 0 0 1 0.02% 0.00% 0.12% 1 0 9 100 825 33,909 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 825 33,909 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 825 33,909 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 0.6 383 2,310 58 44 75 15.05% 11.40% 19.58% 408 317 519 2 383 2,310 16 12 20 4.05% 3.13% 5.22% 106 83 133 6 383 2,310 5 3 7 1.18% 0.78% 1.83% 25 19 44 10 383 2,310 2 1 3 0.55% 0.26% 0.87% 15 9 19 20 383 2,310 1 1 1 0.26% 0.26% 0.26% 9 9 9 60 383 2,310 0 0 1 0.04% 0.00% 0.26% 1 0 9 100 383 2,310 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 383 2,310 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 383 2,310 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 0.6 358 30,448 6 2 11 1.61% 0.56% 3.07% 524 168 996 2 358 30,448 0 0 2 0.13% 0.00% 0.56% 60 0 168 6 358 30,448 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 358 30,448 0 0 0 0.00% 0.00% 0.00% 1 0 0 20 358 30,448 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 358 30,448 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 358 30,448 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 358 30,448 0 0 0 0.00% 0.00% 0.00% 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 10 6 15 11.79% 7.14% 17.86% 244 126 435 2 84 1,151 5 2 6 5.57% 2.38% 7.14% 106 22 126 6 84 1,151 1 0 2 0.74% 0.00% 2.38% 2 0 22 10 84 1,151 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 84 1,151 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 84 1,151 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 84 1,151 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 84 1,151 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 84 1,151 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 17 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 ALL SYSTEMS 81,403,786 162,744,918 6,456,478 4,601,489 9,179,819 7.93% 5.65% 11.28% 12,917,253 9,012,111 18,725,259 81,403,786 162,744,918 1,608,201 760,832 3,717,368 1.98% 0.93% 4.57% 4,302,955 2,637,532 7,405,451 81,403,786 162,744,918 467,851 127,294 706,204 0.57% 0.16% 0.87% 638,095 165,114 2,353,550 81,403,786 162,744,918 93,318 456 306,186 0.11% 0.00% 0.38% 119,039 4,370 344,007 81,403,786 162,744,918 500 456 456 0.00% 0.00% 0.00% 4,796 4,370 4,370 81,403,786 162,744,918 74 0 456 0.00% 0.00% 0.00% 712 0 4,370 81,403,786 162,744,918 1 0 0 0.00% 0.00% 0.00% 8 0 0 81,403,786 162,744,918 0 0 0 0.00% 0.00% 0.00% 0 0 0 81,403,786 162,744,918 0 0 0 0.00% 0.00% 0.00% 0 0 0 45,113,339 62,876,111 5,228,050 4,013,806 7,227,715 11.59% 8.90% 16.02% 8,144,736 6,078,313 11,089,647 45,113,339 62,876,111 1,199,432 513,286 3,129,685 2.66% 1.14% 6.94% 2,101,853 1,134,620 4,471,652 45,113,339 62,876,111 373,663 127,294 458,658 0.83% 0.28% 1.02% 471,030 165,114 850,638 45,113,339 62,876,111 93,318 456 306,186 0.21% 0.00% 0.68% 119,039 4,370 344,007 45,113,339 62,876,111 500 456 456 0.00% 0.00% 0.00% 4,796 4,370 4,370 45,113,339 62,876,111 74 0 456 0.00% 0.00% 0.00% 712 0 4,370 45,113,339 62,876,111 1 0 0 0.00% 0.00% 0.00% 8 0 0 45,113,339 62,876,111 0 0 0 0.00% 0.00% 0.00% 0 0 0 45,113,339 62,876,111 0 0 0 0.00% 0.00% 0.00% 0 0 0 17,077,006 62,564,793 213,994 94,725 469,790 1.25% 0.55% 2.75% 1,158,803 503,269 2,183,893 17,077,006 62,564,793 8,104 0 94,725 0.05% 0.00% 0.55% 56,630 0 503,269 17,077,006 62,564,793 0 0 0 0.00% 0.00% 0.00% 0 0 0 17,077,006 62,564,793 0 0 0 0.00% 0.00% 0.00% 0 0 0 17,077,006 62,564,793 0 0 0 0.00% 0.00% 0.00% 0 0 0 17,077,006 62,564,793 0 0 0 0.00% 0.00% 0.00% 0 0 0 17,077,006 62,564,793 0 0 0 0.00% 0.00% 0.00% 0 0 0 17,077,006 62,564,793 0 0 0 0.00% 0.00% 0.00% 0 0 0 17,077,006 62,564,793 0 0 0 0.00% 0.00% 0.00% 0 0 0 19,213,441 37,304,014 1,014,433 492,958 1,482,314 5.28% 2.57% 7.71% 3,613,715 2,430,530 5,451,718 19,213,441 37,304,014 400,666 247,546 492,958 2.09% 1.29% 2.57% 2,144,472 1,502,912 2,430,530 19,213,441 37,304,014 94,188 0 247,546 0.49% 0.00% 1.29% 167,065 0 1,502,912 19,213,441 37,304,014 0 0 0 0.00% 0.00% 0.00% 0 0 0 19,213,441 37,304,014 0 0 0 0.00% 0.00% 0.00% 0 0 0 19,213,441 37,304,014 0 0 0 0.00% 0.00% 0.00% 0 0 0 19,213,441 37,304,014 0 0 0 0.00% 0.00% 0.00% 0 0 0 19,213,441 37,304,014 0 0 0 0.00% 0.00% 0.00% 0 0 0 19,213,441 37,304,014 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 18 of 58 December 2016 ------- F.3 - CA 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 20 849 17 14 20 70.66% 41.06% 100.00% 600 348 849 2 20 849 12 11 15 35.15% 20.04% 59.98% 298 170 509 6 20 849 8 7 9 16.87% 15.82% 17.93% 143 134 152 10 20 849 6 5 7 14.57% 13.72% 15.82% 124 116 134 20 20 849 4 3 5 12.76% 11.61% 13.72% 108 99 116 60 20 849 1 0 2 1.88% 0.00% 10.55% 16 0 90 100 20 849 0 0 1 0.15% 0.00% 1.05% 1 0 9 200 20 849 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 20 849 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 0.6 14 125 13 12 14 93.12% 85.71% 100.00% 117 107 125 2 14 125 10 10 12 74.81% 71.43% 85.71% 94 89 107 6 14 125 7 6 8 49.24% 42.86% 57.14% 62 54 72 10 14 125 5 4 6 33.86% 28.57% 42.86% 42 36 54 20 14 125 3 2 4 22.07% 14.29% 28.57% 28 18 36 60 14 125 1 0 1 5.86% 0.00% 7.14% 7 0 9 100 14 125 0 0 1 0.99% 0.00% 7.14% 1 0 9 200 14 125 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 14 125 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 0.6 3 482 2 1 3 60.80% 33.33% 100.00% 293 161 482 2 3 482 1 0 2 25.22% 0.00% 66.67% 121 0 321 6 3 482 0 0 0 0.19% 0.00% 0.00% 1 0 0 10 3 482 0 0 0 0.12% 0.00% 0.00% 1 0 0 20 3 482 0 0 0 0.00% 0.00% 0.00% 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 3 242 2 1 3 78.65% 33.33% 100.00% 190 81 242 2 3 242 1 1 1 34.39% 33.33% 33.33% 83 81 81 6 3 242 1 1 1 33.33% 33.33% 33.33% 81 81 81 10 3 242 1 1 1 33.33% 33.33% 33.33% 81 81 81 20 3 242 1 1 1 33.33% 33.33% 33.33% 81 81 81 60 3 242 0 0 1 3.56% 0.00% 33.33% 9 0 81 100 3 242 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 3 242 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 3 242 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 19 of 58 December 2016 ------- F.3 - CA 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) 83,754 1,335,490 70,196 49,703 83,754 71.60% 59.34% 100.00% 956,204 508,090 1,335,490 83,754 1,335,490 45,474 40,762 54,952 33.40% 48.67% 65.61% 446,099 322,089 572,762 83,754 1,335,490 33,227 25,006 40,642 20.87% 29.86% 48.53% 278,687 229,769 321,385 83,754 1,335,490 24,490 22,590 31,541 16.98% 26.97% 37.66% 226,743 215,613 268,060 83,754 1,335,490 18,766 13,904 22,590 14.47% 16.60% 26.97% 193,206 164,717 215,613 83,754 1,335,490 5,760 0 9,857 3.19% 0.00% 11.77% 42,634 0 141,007 83,754 1,335,490 915 0 6,600 0.40% 0.00% 7.88% 5,359 0 38,671 83,754 1,335,490 0 0 0 0.00% 0.00% 0.00% 0 0 0 83,754 1,335,490 0 0 0 0.00% 0.00% 0.00% 0 0 0 54,146 317,258 50,664 42,546 54,146 93.57% 78.58% 100.00% 296,856 249,290 317,258 54,146 317,258 39,336 37,505 46,805 72.65% 69.27% 86.44% 230,483 219,753 274,245 54,146 317,258 29,948 21,749 37,385 55.31% 40.17% 69.04% 175,473 127,434 219,050 54,146 317,258 21,233 19,333 28,284 39.21% 35.71% 52.24% 124,408 113,278 165,725 54,146 317,258 15,509 10,647 19,333 28.64% 19.66% 35.71% 90,871 62,381 113,278 54,146 317,258 5,412 0 6,600 10.00% 0.00% 12.19% 31,711 0 38,671 54,146 317,258 915 0 6,600 1.69% 0.00% 12.19% 5,359 0 38,671 54,146 317,258 0 0 0 0.00% 0.00% 0.00% 0 0 0 54,146 317,258 0 0 0 0.00% 0.00% 0.00% 0 0 0 10,110 405,603 5,246 3,900 10,110 51.89% 38.58% 100.00% 210,483 156,464 405,603 10,110 405,603 2,618 0 4,890 25.90% 0.00% 48.37% 105,037 0 196,182 10,110 405,603 22 0 0 0.22% 0.00% 0.00% 879 0 0 10,110 405,603 0 0 0 0.00% 0.00% 0.00% 0 0 0 10,110 405,603 0 0 0 0.00% 0.00% 0.00% 0 0 0 10,110 405,603 0 0 0 0.00% 0.00% 0.00% 0 0 0 10,110 405,603 0 0 0 0.00% 0.00% 0.00% 0 0 0 10,110 405,603 0 0 0 0.00% 0.00% 0.00% 0 0 0 10,110 405,603 0 0 0 0.00% 0.00% 0.00% 0 0 0 19,498 612,628 14,286 3,257 19,498 73.27% 16.70% 100.00% 448,865 102,335 612,628 19,498 612,628 3,519 3,257 3,257 18.05% 16.70% 16.70% 110,578 102,335 102,335 19,498 612,628 3,257 3,257 3,257 16.70% 16.70% 16.70% 102,335 102,335 102,335 19,498 612,628 3,257 3,257 3,257 16.70% 16.70% 16.70% 102,335 102,335 102,335 19,498 612,628 3,257 3,257 3,257 16.70% 16.70% 16.70% 102,335 102,335 102,335 19,498 612,628 348 0 3,257 1.78% 0.00% 16.70% 10,923 0 102,335 19,498 612,628 0 0 0 0.00% 0.00% 0.00% 0 0 0 19,498 612,628 0 0 0 0.00% 0.00% 0.00% 0 0 0 19,498 612,628 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 20 of 58 December 2016 ------- F.3 - CA 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 55 435 36 30 41 67.08% 58.27% 76.69% 292 253 333 2 55 435 18 14 22 34.44% 24.00% 43.11% 150 104 187 6 55 435 8 6 11 15.54% 11.94% 19.79% 68 52 86 10 55 435 4 2 7 7.57% 2.81% 13.76% 33 12 60 20 55 435 2 1 2 2.23% 1.40% 2.81% 10 6 12 60 55 435 0 0 0 0.01% 0.00% 0.00% 0 0 0 100 55 435 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 55 435 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 55 435 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 0.6 30 183 24 21 26 79.31% 70.00% 87.83% 145 128 161 2 30 183 13 11 15 42.93% 36.67% 50.00% 79 67 92 6 30 183 7 5 8 22.08% 16.67% 26.67% 40 31 49 10 30 183 4 2 5 12.23% 6.67% 16.67% 22 12 31 20 30 183 2 1 2 5.20% 3.33% 6.67% 10 6 12 60 30 183 0 0 0 0.01% 0.00% 0.00% 0 0 0 100 30 183 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 30 183 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 30 183 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 0.6 21 166 8 5 11 37.19% 23.81% 52.38% 62 40 87 2 21 166 3 2 4 14.80% 9.52% 19.05% 25 16 32 6 21 166 1 0 2 3.62% 0.00% 9.52% 6 0 16 10 21 166 0 0 1 0.37% 0.00% 4.76% 1 0 8 20 21 166 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 21 166 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 21 166 0 0 0 0.00% 0.00% 0.00% 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 Mixed Water Systems 0.6 4 86 4 4 4 98.88% 100.00% 100.00% 85 86 86 2 4 86 2 1 3 54.35% 25.00% 75.00% 47 21 64 6 4 86 1 1 1 24.67% 25.00% 25.00% 21 21 21 10 4 86 0 0 1 11.56% 0.00% 25.00% 10 0 21 20 4 86 0 0 0 0.19% 0.00% 0.00% 0 0 0 60 4 86 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 4 86 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 4 86 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 4 86 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 21 of 58 December 2016 ------- F.3 - CA 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) 2,969,366 13,281,323 1,924,594 1,602,123 2,256,553 69.33% 53.96% 75.99% 9,207,715 7,982,389 10,509,840 2,969,366 13,281,323 965,073 695,897 1,193,717 35.73% 23.44% 40.20% 4,745,105 3,034,925 6,066,942 2,969,366 13,281,323 389,499 289,552 553,138 14.01% 9.75% 18.63% 1,860,155 1,481,943 2,492,005 2,969,366 13,281,323 201,167 71,841 321,990 7.09% 2.42% 10.84% 941,479 273,214 1,609,109 2,969,366 13,281,323 49,052 13,601 71,841 1.43% 0.46% 2.42% 189,400 51,725 273,214 2,969,366 13,281,323 135 0 0 0.00% 0.00% 0.00% 512 0 0 2,969,366 13,281,323 0 0 0 0.00% 0.00% 0.00% 0 0 0 2,969,366 13,281,323 0 0 0 0.00% 0.00% 0.00% 0 0 0 2,969,366 13,281,323 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,609,787 6,122,088 1,254,349 1,089,247 1,414,164 77.92% 67.66% 87.85% 4,770,344 4,142,452 5,378,126 1,609,787 6,122,088 679,351 576,779 772,204 42.20% 35.83% 47.97% 2,583,603 2,193,516 2,936,725 1,609,787 6,122,088 309,750 235,552 434,020 19.24% 14.63% 26.96% 1,177,992 895,814 1,650,597 1,609,787 6,122,088 173,529 71,841 235,552 10.78% 4.46% 14.63% 659,937 273,214 895,814 1,609,787 6,122,088 48,648 13,601 71,841 3.02% 0.84% 4.46% 185,009 51,725 273,214 1,609,787 6,122,088 135 0 0 0.01% 0.00% 0.00% 512 0 0 1,609,787 6,122,088 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,609,787 6,122,088 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,609,787 6,122,088 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,095,758 4,295,660 409,235 249,055 578,568 37.35% 22.73% 52.80% 1,604,310 976,361 2,268,138 1,095,758 4,295,660 135,533 65,118 208,392 12.37% 5.94% 19.02% 531,327 255,280 816,951 1,095,758 4,295,660 26,457 0 65,118 2.41% 0.00% 5.94% 103,718 0 255,280 1,095,758 4,295,660 2,661 0 32,438 0.24% 0.00% 2.96% 10,430 0 127,165 1,095,758 4,295,660 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,095,758 4,295,660 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,095,758 4,295,660 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,095,758 4,295,660 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,095,758 4,295,660 0 0 0 0.00% 0.00% 0.00% 0 0 0 263,821 2,863,575 261,010 263,821 263,821 98.93% 100.00% 100.00% 2,833,061 2,863,575 2,863,575 263,821 2,863,575 150,188 54,000 213,121 56.93% 20.47% 80.78% 1,630,176 586,129 2,313,266 263,821 2,863,575 53,292 54,000 54,000 20.20% 20.47% 20.47% 578,445 586,129 586,129 263,821 2,863,575 24,978 0 54,000 9.47% 0.00% 20.47% 271,112 0 586,129 263,821 2,863,575 404 0 0 0.15% 0.00% 0.00% 4,390 0 0 263,821 2,863,575 0 0 0 0.00% 0.00% 0.00% 0 0 0 263,821 2,863,575 0 0 0 0.00% 0.00% 0.00% 0 0 0 263,821 2,863,575 0 0 0 0.00% 0.00% 0.00% 0 0 0 263,821 2,863,575 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 22 of 58 December 2016 ------- F.3 - CA 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 0.6 129 129 90 79 101 69.78% 61.24% 78.29% 90 79 101 2 129 129 36 30 42 27.94% 23.26% 32.56% 36 30 42 6 129 129 10 8 13 8.12% 6.20% 10.08% 10 8 13 10 129 129 5 4 7 3.94% 3.10% 5.43% 5 4 7 20 129 129 2 1 3 1.36% 0.78% 2.33% 2 1 3 60 129 129 1 0 1 0.42% 0.00% 0.78% 1 0 1 100 129 129 0 0 0 0.01% 0.00% 0.00% 0 0 0 200 129 129 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 129 129 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 0.6 84 84 64 58 70 75.80% 69.05% 83.33% 64 58 70 2 84 84 29 26 32 34.60% 30.95% 38.10% 29 26 32 6 84 84 10 8 12 12.07% 9.52% 14.29% 10 8 12 10 84 84 5 4 7 6.04% 4.76% 8.33% 5 4 7 20 84 84 2 1 3 2.09% 1.19% 3.57% 2 1 3 60 84 84 1 0 1 0.64% 0.00% 1.19% 1 0 1 100 84 84 0 0 0 0.02% 0.00% 0.00% 0 0 0 200 84 84 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 84 84 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 0.6 17 17 8 5 10 44.49% 29.41% 58.82% 8 5 10 2 17 17 2 1 3 12.26% 5.88% 17.65% 2 1 3 6 17 17 0 0 0 0.10% 0.00% 0.00% 0 0 0 10 17 17 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 17 17 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 17 17 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 17 17 0 0 0 0.00% 0.00% 0.00% 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 Mixed Water Systems 0.6 28 28 19 16 21 67.07% 57.14% 75.00% 19 16 21 2 28 28 5 3 7 17.49% 10.71% 25.00% 5 3 7 6 28 28 0 0 1 1.12% 0.00% 3.57% 0 0 1 10 28 28 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 28 28 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 28 28 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 28 28 0 0 0 0.00% 0.00% 0.00% 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 23 of 58 December 2016 ------- F.3 - CA 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) 40,196,393 40,196,393 27,954,909 23,025,918 33,334,604 69.55% 57.28% 82.93% 27,954,909 23,025,918 33,334,604 40,196,393 40,196,393 9,962,622 8,499,607 11,604,577 24.78% 21.15% 28.87% 9,962,622 8,499,607 11,604,577 40,196,393 40,196,393 2,609,316 2,000,440 3,320,678 6.49% 4.98% 8.26% 2,609,316 2,000,440 3,320,678 40,196,393 40,196,393 1,357,406 995,593 1,845,440 3.38% 2.48% 4.59% 1,357,406 995,593 1,845,440 40,196,393 40,196,393 447,549 101,883 995,593 1.11% 0.25% 2.48% 447,549 101,883 995,593 40,196,393 40,196,393 55,139 0 101,883 0.14% 0.00% 0.25% 55,139 0 101,883 40,196,393 40,196,393 1,526 0 0 0.00% 0.00% 0.00% 1,526 0 0 40,196,393 40,196,393 0 0 0 0.00% 0.00% 0.00% 0 0 0 40,196,393 40,196,393 0 0 0 0.00% 0.00% 0.00% 0 0 0 30,089,884 30,089,884 22,164,186 19,092,998 25,486,893 73.66% 63.45% 84.70% 22,164,186 19,092,998 25,486,893 30,089,884 30,089,884 8,526,885 7,551,764 9,681,182 28.34% 25.10% 32.17% 8,526,885 7,551,764 9,681,182 30,089,884 30,089,884 2,553,233 2,000,440 3,168,903 8.49% 6.65% 10.53% 2,553,233 2,000,440 3,168,903 30,089,884 30,089,884 1,357,406 995,593 1,845,440 4.51% 3.31% 6.13% 1,357,406 995,593 1,845,440 30,089,884 30,089,884 447,549 101,883 995,593 1.49% 0.34% 3.31% 447,549 101,883 995,593 30,089,884 30,089,884 55,139 0 101,883 0.18% 0.00% 0.34% 55,139 0 101,883 30,089,884 30,089,884 1,526 0 0 0.01% 0.00% 0.00% 1,526 0 0 30,089,884 30,089,884 0 0 0 0.00% 0.00% 0.00% 0 0 0 30,089,884 30,089,884 0 0 0 0.00% 0.00% 0.00% 0 0 0 5,268,728 5,268,728 2,451,020 1,060,668 4,058,437 46.52% 20.13% 77.03% 2,451,020 1,060,668 4,058,437 5,268,728 5,268,728 359,408 133,846 522,963 6.82% 2.54% 9.93% 359,408 133,846 522,963 5,268,728 5,268,728 3,599 0 0 0.07% 0.00% 0.00% 3,599 0 0 5,268,728 5,268,728 0 0 0 0.00% 0.00% 0.00% 0 0 0 5,268,728 5,268,728 0 0 0 0.00% 0.00% 0.00% 0 0 0 5,268,728 5,268,728 0 0 0 0.00% 0.00% 0.00% 0 0 0 5,268,728 5,268,728 0 0 0 0.00% 0.00% 0.00% 0 0 0 5,268,728 5,268,728 0 0 0 0.00% 0.00% 0.00% 0 0 0 5,268,728 5,268,728 0 0 0 0.00% 0.00% 0.00% 0 0 0 4,837,781 4,837,781 3,339,704 2,872,252 3,789,275 69.03% 59.37% 78.33% 3,339,704 2,872,252 3,789,275 4,837,781 4,837,781 1,076,329 813,997 1,400,433 22.25% 16.83% 28.95% 1,076,329 813,997 1,400,433 4,837,781 4,837,781 52,483 0 151,775 1.08% 0.00% 3.14% 52,483 0 151,775 4,837,781 4,837,781 0 0 0 0.00% 0.00% 0.00% 0 0 0 4,837,781 4,837,781 0 0 0 0.00% 0.00% 0.00% 0 0 0 4,837,781 4,837,781 0 0 0 0.00% 0.00% 0.00% 0 0 0 4,837,781 4,837,781 0 0 0 0.00% 0.00% 0.00% 0 0 0 4,837,781 4,837,781 0 0 0 0.00% 0.00% 0.00% 0 0 0 4,837,781 4,837,781 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 24 of 58 December 2016 ------- F.3 - CA 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 ALL SYSTEMS All Systems 0.6 204 1,412 143 123 162 70.00% 60.29% 79.58% 981 681 1,283 2 204 1,412 66 55 79 32.58% 26.96% 38.73% 484 304 738 6 204 1,412 27 21 33 13.11% 10.29% 16.18% 221 194 251 10 204 1,412 15 11 21 7.37% 5.39% 10.29% 162 133 201 20 204 1,412 7 5 10 3.63% 2.45% 4.90% 120 106 132 60 204 1,412 1 0 3 0.72% 0.00% 1.47% 17 0 91 100 204 1,412 0 0 1 0.08% 0.00% 0.49% 1 0 9 200 204 1,412 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 204 1,412 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 0.6 128 392 101 91 110 78.52% 71.09% 86.21% 325 293 356 2 128 392 52 47 59 40.95% 36.72% 46.09% 201 183 231 6 128 392 24 19 28 18.48% 14.84% 21.88% 112 92 132 10 128 392 13 10 18 10.54% 7.81% 14.06% 70 52 91 20 128 392 6 4 9 5.00% 3.13% 7.03% 39 25 51 60 128 392 1 0 2 1.07% 0.00% 1.56% 8 0 10 100 128 392 0 0 1 0.12% 0.00% 0.78% 1 0 9 200 128 392 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 128 392 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 0.6 41 665 17 11 24 41.95% 26.83% 58.54% 362 205 578 2 41 665 6 3 9 14.51% 7.32% 21.95% 148 17 356 6 41 665 1 0 2 1.91% 0.00% 4.88% 7 0 16 10 41 665 0 0 1 0.20% 0.00% 2.44% 1 0 8 20 41 665 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 41 665 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 41 665 0 0 0 0.00% 0.00% 0.00% 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 Mixed Water Systems 0.6 35 355 25 21 28 71.70% 60.00% 80.00% 294 182 348 2 35 355 8 5 11 23.15% 14.29% 31.43% 135 105 152 6 35 355 2 2 3 6.57% 5.71% 8.57% 102 102 103 10 35 355 1 1 2 4.18% 2.86% 5.71% 91 81 102 20 35 355 1 1 1 2.88% 2.86% 2.86% 81 81 81 60 35 355 0 0 1 0.30% 0.00% 2.86% 9 0 81 100 35 355 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 35 355 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 35 355 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 25 of 58 December 2016 ------- F.3 - CA 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 ALL SYSTEMS 43,249,513 54,813,206 29,949,700 24,677,744 35,674,910 69.25% 57.06% 82.49% 38,118,828 31,516,397 45,179,933 43,249,513 54,813,206 10,973,168 9,236,267 12,853,246 25.37% 21.36% 29.72% 15,153,826 11,856,621 18,244,282 43,249,513 54,813,206 3,032,041 2,314,998 3,914,458 7.01% 5.35% 9.05% 4,748,158 3,712,152 6,134,069 43,249,513 54,813,206 1,583,063 1,090,024 2,198,971 3.66% 2.52% 5.08% 2,525,628 1,484,421 3,722,609 43,249,513 54,813,206 515,367 129,388 1,090,024 1.19% 0.30% 2.52% 830,155 318,325 1,484,421 43,249,513 54,813,206 61,033 0 111,740 0.14% 0.00% 0.26% 98,284 0 242,890 43,249,513 54,813,206 2,441 0 6,600 0.01% 0.00% 0.02% 6,885 0 38,671 43,249,513 54,813,206 0 0 0 0.00% 0.00% 0.00% 0 0 0 43,249,513 54,813,206 0 0 0 0.00% 0.00% 0.00% 0 0 0 31,753,817 36,529,231 23,469,199 20,224,791 26,955,202 73.91% 63.69% 84.89% 27,231,385 23,484,741 31,182,277 31,753,817 36,529,231 9,245,572 8,166,049 10,500,191 29.12% 25.72% 33.07% 11,340,971 9,965,034 12,892,152 31,753,817 36,529,231 2,892,931 2,257,741 3,640,308 9.11% 7.11% 11.46% 3,906,698 3,023,689 5,038,550 31,753,817 36,529,231 1,552,167 1,086,767 2,109,276 4.89% 3.42% 6.64% 2,141,751 1,382,085 2,906,979 31,753,817 36,529,231 511,706 126,131 1,086,767 1.61% 0.40% 3.42% 723,429 215,990 1,382,085 31,753,817 36,529,231 60,685 0 108,483 0.19% 0.00% 0.34% 87,361 0 140,554 31,753,817 36,529,231 2,441 0 6,600 0.01% 0.00% 0.02% 6,885 0 38,671 31,753,817 36,529,231 0 0 0 0.00% 0.00% 0.00% 0 0 0 31,753,817 36,529,231 0 0 0 0.00% 0.00% 0.00% 0 0 0 6,374,596 9,969,990 2,865,501 1,313,623 4,647,114 44.95% 20.61% 72.90% 4,265,813 2,193,493 6,732,178 6,374,596 9,969,990 497,559 198,964 736,245 7.81% 3.12% 11.55% 995,772 389,126 1,536,096 6,374,596 9,969,990 30,078 0 65,118 0.47% 0.00% 1.02% 108,197 0 255,280 6,374,596 9,969,990 2,661 0 32,438 0.04% 0.00% 0.51% 10,430 0 127,165 6,374,596 9,969,990 0 0 0 0.00% 0.00% 0.00% 0 0 0 6,374,596 9,969,990 0 0 0 0.00% 0.00% 0.00% 0 0 0 6,374,596 9,969,990 0 0 0 0.00% 0.00% 0.00% 0 0 0 6,374,596 9,969,990 0 0 0 0.00% 0.00% 0.00% 0 0 0 6,374,596 9,969,990 0 0 0 0.00% 0.00% 0.00% 0 0 0 5,121,100 8,313,985 3,615,000 3,139,330 4,072,594 70.59% 61.30% 79.53% 6,621,630 5,838,163 7,265,478 5,121,100 8,313,985 1,230,036 871,254 1,616,811 24.02% 17.01% 31.57% 2,817,083 1,502,461 3,816,034 5,121,100 8,313,985 109,032 57,257 209,032 2.13% 1.12% 4.08% 733,264 688,464 840,239 5,121,100 8,313,985 28,235 3,257 57,257 0.55% 0.06% 1.12% 373,447 102,335 688,464 5,121,100 8,313,985 3,661 3,257 3,257 0.07% 0.06% 0.06% 106,726 102,335 102,335 5,121,100 8,313,985 348 0 3,257 0.01% 0.00% 0.06% 10,923 0 102,335 5,121,100 8,313,985 0 0 0 0.00% 0.00% 0.00% 0 0 0 5,121,100 8,313,985 0 0 0 0.00% 0.00% 0.00% 0 0 0 5,121,100 8,313,985 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 26 of 58 December 2016 ------- F.4 - CA with CL-OT Source Water Type Threshold (ng/L) Total Number of UCMR2 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 - 90% CI on Number of Systems with Mean Exceeding Threshold - National Extrapolation Systems Lower Bound Upper Bound Lower Bound Upper Bound National Extrapolation Lower Bound Upper Bound SMALL SYSTEMS (Serving < 10,000) 0.6 25 1,252 20 18 22 59.23% 52.94% 67.91% 741 663 850 2 25 1,252 14 11 17 36.64% 25.04% 46.50% 459 313 582 6 25 1,252 7 5 9 19.64% 15.02% 23.61% 246 188 296 10 25 1,252 3 2 5 7.18% 1.43% 15.02% 90 18 188 All Systems 20 25 1,252 2 1 2 1.16% 0.71% 1.43% 14 9 18 60 25 1,252 0 0 1 0.04% 0.00% 0.71% 1 0 9 100 25 1,252 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 25 1,252 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 25 1,252 0 0 0 0.00% 0.00% 0.00% 0 0 0 0.6 14 125 13 11 14 91.13% 78.57% 100.00% 114 98 125 2 14 125 10 8 11 70.12% 57.14% 78.57% 88 72 98 6 14 125 4 3 6 30.91% 21.43% 42.86% 39 27 54 Surface Water Systems 10 14 125 2 2 3 17.38% 14.29% 21.43% 22 18 27 20 14 125 2 1 2 11.57% 7.14% 14.29% 14 9 18 60 14 125 0 0 1 0.44% 0.00% 7.14% 1 0 9 100 14 125 0 0 0 0.01% 0.00% 0.00% 0 0 0 200 14 125 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 14 125 0 0 0 0.00% 0.00% 0.00% 0 0 0 0.6 3 482 0 0 1 12.42% 0.00% 33.33% 60 0 161 2 3 482 0 0 0 0.19% 0.00% 0.00% 1 0 0 6 3 482 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 10 3 482 0 0 0 0.12% 0.00% 0.00% 1 0 0 20 3 482 0 0 0 0.00% 0.00% 0.00% 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 0.6 8 645 7 7 7 87.99% 87.50% 87.50% 567 564 564 2 8 645 5 3 6 57.35% 37.50% 75.00% 370 242 484 6 8 645 3 2 3 32.12% 25.00% 37.50% 207 161 242 Mixed Water Systems 10 8 645 1 0 2 10.46% 0.00% 25.00% 67 0 161 20 8 645 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 8 645 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 8 645 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 8 645 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 8 645 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 27 of 58 December 2016 ------- F.4 - CA with CL-OT 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) 112,710 2,356,537 94,000 83,915 102,922 74.01% 74.45% 91.32% 1,744,056 1,639,737 1,927,618 112,710 2,356,537 64,776 50,379 81,665 41.66% 44.70% 72.46% 981,772 596,269 1,545,222 112,710 2,356,537 28,236 13,822 43,308 17.18% 12.26% 38.42% 404,863 209,745 561,797 112,710 2,356,537 11,695 9,244 21,931 4.88% 8.20% 19.46% 115,008 45,065 249,275 112,710 2,356,537 6,562 2,172 9,244 1.36% 1.93% 8.20% 31,991 10,589 45,065 112,710 2,356,537 134 0 2,172 0.03% 0.00% 1.93% 654 0 10,589 112,710 2,356,537 4 0 0 0.00% 0.00% 0.00% 20 0 0 112,710 2,356,537 0 0 0 0.00% 0.00% 0.00% 0 0 0 112,710 2,356,537 0 0 0 0.00% 0.00% 0.00% 0 0 0 65,078 317,258 59,505 50,772 65,078 91.44% 78.02% 100.00% 290,093 247,515 317,258 65,078 317,258 46,842 40,935 50,772 71.98% 62.90% 78.02% 228,358 199,559 247,515 65,078 317,258 21,040 9,988 33,864 32.33% 15.35% 52.04% 102,573 48,692 165,087 65,078 317,258 10,134 9,244 18,097 15.57% 14.20% 27.81% 49,402 45,065 88,222 65,078 317,258 6,562 2,172 9,244 10.08% 3.34% 14.20% 31,991 10,589 45,065 65,078 317,258 134 0 2,172 0.21% 0.00% 3.34% 654 0 10,589 65,078 317,258 4 0 0 0.01% 0.00% 0.00% 20 0 0 65,078 317,258 0 0 0 0.00% 0.00% 0.00% 0 0 0 65,078 317,258 0 0 0 0.00% 0.00% 0.00% 0 0 0 8,741 405,603 1,132 0 4,701 12.95% 0.00% 53.78% 52,516 0 218,138 8,741 405,603 18 0 0 0.21% 0.00% 0.00% 844 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 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 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 33,363 33,143 33,143 85.78% 85.22% 85.22% 1,401,447 1,392,222 1,392,222 38,891 1,633,675 17,916 9,444 30,893 46.07% 24.28% 79.43% 752,570 396,709 1,297,707 38,891 1,633,675 7,196 3,834 9,444 18.50% 9.86% 24.28% 302,290 161,053 396,709 38,891 1,633,675 1,562 0 3,834 4.02% 0.00% 9.86% 65,606 0 161,053 38,891 1,633,675 0 0 0 0.00% 0.00% 0.00% 0 0 0 38,891 1,633,675 0 0 0 0.00% 0.00% 0.00% 0 0 0 38,891 1,633,675 0 0 0 0.00% 0.00% 0.00% 0 0 0 38,891 1,633,675 0 0 0 0.00% 0.00% 0.00% 0 0 0 38,891 1,633,675 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 28 of 58 December 2016 ------- F.4 - CA with CL-OT 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 9 149 4 2 6 47.69% 28.82% 67.07% 71 43 100 2 9 149 0 0 1 5.69% 0.00% 14.41% 8 0 21 6 9 149 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 9 149 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 9 149 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 9 149 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 9 149 0 0 0 0.00% 0.00% 0.00% 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 Surface Water Systems 0.6 2 12 0 0 1 17.13% 0.00% 50.00% 2 0 6 2 2 12 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 2 12 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 2 12 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 2 12 0 0 0 0.00% 0.00% 0.00% 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 Ground Water Systems 0.6 1 8 0 0 1 15.17% 0.00% 100.00% 1 0 8 2 1 8 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 1 8 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 8 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 1 8 0 0 0 0.00% 0.00% 0.00% 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 Mixed Water Systems 0.6 6 128 3 2 4 52.59% 33.33% 66.67% 68 43 86 2 6 128 0 0 1 6.59% 0.00% 16.67% 8 0 21 6 6 128 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 6 128 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 6 128 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 6 128 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 6 128 0 0 0 0.00% 0.00% 0.00% 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 29 of 58 December 2016 ------- F.4 - CA with CL-OT 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) 369,899 4,908,058 155,192 107,330 257,815 49.97% 29.02% 69.70% 2,452,719 1,855,754 3,401,789 369,899 4,908,058 21,460 0 55,279 7.56% 0.00% 14.94% 371,045 0 955,783 369,899 4,908,058 0 0 0 0.00% 0.00% 0.00% 0 0 0 369,899 4,908,058 0 0 0 0.00% 0.00% 0.00% 0 0 0 369,899 4,908,058 0 0 0 0.00% 0.00% 0.00% 0 0 0 369,899 4,908,058 0 0 0 0.00% 0.00% 0.00% 0 0 0 369,899 4,908,058 0 0 0 0.00% 0.00% 0.00% 0 0 0 369,899 4,908,058 0 0 0 0.00% 0.00% 0.00% 0 0 0 369,899 4,908,058 0 0 0 0.00% 0.00% 0.00% 0 0 0 69,623 408,139 10,992 0 31,849 15.79% 0.00% 45.74% 64,438 0 186,703 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 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 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 7,865 0 51,848 15.17% 0.00% 100.00% 31,028 0 204,555 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 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 4,295,363 136,335 107,330 174,118 54.88% 43.20% 70.09% 2,357,253 1,855,754 3,010,530 248,428 4,295,363 21,460 0 55,279 8.64% 0.00% 22.25% 371,045 0 955,783 248,428 4,295,363 0 0 0 0.00% 0.00% 0.00% 0 0 0 248,428 4,295,363 0 0 0 0.00% 0.00% 0.00% 0 0 0 248,428 4,295,363 0 0 0 0.00% 0.00% 0.00% 0 0 0 248,428 4,295,363 0 0 0 0.00% 0.00% 0.00% 0 0 0 248,428 4,295,363 0 0 0 0.00% 0.00% 0.00% 0 0 0 248,428 4,295,363 0 0 0 0.00% 0.00% 0.00% 0 0 0 248,428 4,295,363 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 30 of 58 December 2016 ------- F.4 - CA with CL-OT 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 45 45 16 12 20 35.64% 26.67% 44.44% 16 12 20 2 45 45 5 4 6 11.89% 8.89% 13.33% 5 4 6 6 45 45 1 1 1 2.29% 2.22% 2.22% 1 1 1 10 45 45 0 0 1 1.07% 0.00% 2.22% 0 0 1 20 45 45 0 0 0 0.01% 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 Surface Water Systems 0.6 17 17 8 6 10 47.03% 35.29% 58.82% 8 6 10 2 17 17 3 2 4 19.54% 11.76% 23.53% 3 2 4 6 17 17 1 1 1 6.06% 5.88% 5.88% 1 1 1 10 17 17 0 0 1 2.83% 0.00% 5.88% 0 0 1 20 17 17 0 0 0 0.03% 0.00% 0.00% 0 0 0 60 17 17 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 17 17 0 0 0 0.00% 0.00% 0.00% 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 Ground Water Systems 0.6 4 4 0 0 1 10.63% 0.00% 25.00% 0 0 1 2 4 4 0 0 0 0.05% 0.00% 0.00% 0 0 0 6 4 4 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 4 4 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 4 4 0 0 0 0.00% 0.00% 0.00% 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 8 6 9 31.75% 25.00% 37.50% 8 6 9 2 24 24 2 2 2 8.45% 8.33% 8.33% 2 2 2 6 24 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 24 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 24 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 24 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 24 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 24 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 24 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 31 of 58 December 2016 ------- F.4 - CA with CL-OT 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) 21,363,993 21,363,993 8,974,631 5,610,701 12,768,855 42.01% 26.26% 59.77% 8,974,631 5,610,701 12,768,855 21,363,993 21,363,993 3,635,226 3,149,522 3,983,867 17.02% 14.74% 18.65% 3,635,226 3,149,522 3,983,867 21,363,993 21,363,993 112,830 107,719 107,719 0.53% 0.50% 0.50% 112,830 107,719 107,719 21,363,993 21,363,993 51,842 0 107,719 0.24% 0.00% 0.50% 51,842 0 107,719 21,363,993 21,363,993 605 0 0 0.00% 0.00% 0.00% 605 0 0 21,363,993 21,363,993 0 0 0 0.00% 0.00% 0.00% 0 0 0 21,363,993 21,363,993 0 0 0 0.00% 0.00% 0.00% 0 0 0 21,363,993 21,363,993 0 0 0 0.00% 0.00% 0.00% 0 0 0 21,363,993 21,363,993 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,764,629 9,764,629 3,859,845 1,387,735 6,623,521 39.53% 14.21% 67.83% 3,859,845 1,387,735 6,623,521 9,764,629 9,764,629 725,267 246,822 1,081,167 7.43% 2.53% 11.07% 725,267 246,822 1,081,167 9,764,629 9,764,629 112,830 107,719 107,719 1.16% 1.10% 1.10% 112,830 107,719 107,719 9,764,629 9,764,629 51,842 0 107,719 0.53% 0.00% 1.10% 51,842 0 107,719 9,764,629 9,764,629 605 0 0 0.01% 0.00% 0.00% 605 0 0 9,764,629 9,764,629 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,764,629 9,764,629 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,764,629 9,764,629 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,764,629 9,764,629 0 0 0 0.00% 0.00% 0.00% 0 0 0 560,393 560,393 55,936 0 224,004 9.98% 0.00% 39.97% 55,936 0 224,004 560,393 560,393 205 0 0 0.04% 0.00% 0.00% 205 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 0 560,393 560,393 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 0 560,393 560,393 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 5,058,851 4,222,966 5,921,330 45.83% 38.26% 53.64% 5,058,851 4,222,966 5,921,330 11,038,971 11,038,971 2,909,754 2,902,700 2,902,700 26.36% 26.30% 26.30% 2,909,754 2,902,700 2,902,700 11,038,971 11,038,971 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,038,971 11,038,971 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,038,971 11,038,971 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,038,971 11,038,971 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,038,971 11,038,971 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,038,971 11,038,971 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,038,971 11,038,971 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 32 of 58 December 2016 ------- F.4 - CA with CL-OT 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 79 1,445 40 32 48 50.46% 40.51% 60.76% 828 718 970 2 79 1,445 20 15 24 25.52% 18.99% 30.38% 472 317 609 6 79 1,445 8 6 10 10.03% 7.59% 12.66% 247 189 297 10 79 1,445 4 2 6 4.75% 2.53% 7.59% 90 18 189 20 79 1,445 2 1 2 2.06% 1.27% 2.53% 14 9 18 60 79 1,445 0 0 1 0.08% 0.00% 1.27% 1 0 9 100 79 1,445 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 79 1,445 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 79 1,445 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 0.6 33 154 21 17 25 63.93% 51.52% 75.76% 124 104 141 2 33 154 13 10 15 39.81% 30.30% 45.45% 91 74 102 6 33 154 5 4 7 16.24% 12.12% 21.21% 40 28 55 10 33 154 3 2 4 8.83% 6.06% 12.12% 22 18 28 20 33 154 2 1 2 4.93% 3.03% 6.06% 14 9 18 60 33 154 0 0 1 0.19% 0.00% 3.03% 1 0 9 100 33 154 0 0 0 0.01% 0.00% 0.00% 0 0 0 200 33 154 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 33 154 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 0.6 8 493 1 0 3 11.87% 0.00% 37.50% 61 0 169 2 8 493 0 0 0 0.09% 0.00% 0.00% 1 0 0 6 8 493 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 8 493 0 0 0 0.05% 0.00% 0.00% 1 0 0 20 8 493 0 0 0 0.00% 0.00% 0.00% 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 18 15 20 46.88% 39.47% 52.63% 643 613 659 2 38 797 7 5 9 18.45% 13.16% 23.68% 380 244 507 6 38 797 3 2 3 6.76% 5.26% 7.89% 207 161 242 10 38 797 1 0 2 2.20% 0.00% 5.26% 67 0 161 20 38 797 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 38 797 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 38 797 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 38 797 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 38 797 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 33 of 58 December 2016 ------- F.4 - CA with CL-OT Population 90% CI on Population Served by Percent of Population Served 90% CI on Percent of Population Served by Systems with Predicted Mean Exceeding Threshold - National Extrapolation Total Pop. Served 90% CI on Total Pop. Served by Total Population Served by UCMR2 Systems National Population Served by Systems Served by UCMR2 Systems with Predicted Mean UCMR 2 Systems with Predicted Mean Exceeding Threshold by Systems with Predicted Mean Exceeding by Systems with Mean Exceeding Threshold - Systems with Mean Exceeding Threshold - National Extrapolation Exceeding Threshold - National Threshold Lower Bound Upper Bound National Extrapolation Lower Bound Upper Bound Extrapolation Lower Bound Upper Bound ALL SYSTEMS 21,846,602 28,628,587 9,223,822 5,801,946 13,129,592 42.22% 26.56% 60.10% 13,171,406 9,106,193 18,098,261 21,846,602 28,628,587 3,721,461 3,199,901 4,120,811 17.03% 14.65% 18.86% 4,988,043 3,745,791 6,484,873 21,846,602 28,628,587 141,066 121,541 151,027 0.65% 0.56% 0.69% 517,692 317,464 669,516 21,846,602 28,628,587 63,538 9,244 129,650 0.29% 0.04% 0.59% 166,850 45,065 356,994 21,846,602 28,628,587 7,167 2,172 9,244 0.03% 0.01% 0.04% 32,596 10,589 45,065 21,846,602 28,628,587 134 0 2,172 0.00% 0.00% 0.01% 654 0 10,589 21,846,602 28,628,587 4 0 0 0.00% 0.00% 0.00% 20 0 0 21,846,602 28,628,587 0 0 0 0.00% 0.00% 0.00% 0 0 0 21,846,602 28,628,587 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,899,330 10,490,027 3,930,342 1,438,507 6,720,447 39.70% 14.53% 67.89% 4,214,376 1,635,251 7,127,482 9,899,330 10,490,027 772,109 287,757 1,131,939 7.80% 2.91% 11.43% 953,625 446,381 1,328,683 9,899,330 10,490,027 133,870 117,707 141,583 1.35% 1.19% 1.43% 215,402 156,411 272,806 9,899,330 10,490,027 61,976 9,244 125,816 0.63% 0.09% 1.27% 101,244 45,065 195,941 9,899,330 10,490,027 7,167 2,172 9,244 0.07% 0.02% 0.09% 32,596 10,589 45,065 9,899,330 10,490,027 134 0 2,172 0.00% 0.00% 0.02% 654 0 10,589 9,899,330 10,490,027 4 0 0 0.00% 0.00% 0.00% 20 0 0 9,899,330 10,490,027 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,899,330 10,490,027 0 0 0 0.00% 0.00% 0.00% 0 0 0 620,982 1,170,551 64,932 0 280,553 10.46% 0.00% 45.18% 139,480 0 646,697 620,982 1,170,551 223 0 0 0.04% 0.00% 0.00% 1,049 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 0 620,982 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 0 620,982 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 5,228,548 4,363,439 6,128,591 46.16% 38.52% 54.11% 8,817,550 7,470,942 10,324,082 11,326,290 16,968,009 2,949,129 2,912,144 2,988,872 26.04% 25.71% 26.39% 4,033,369 3,299,409 5,156,191 11,326,290 16,968,009 7,196 3,834 9,444 0.06% 0.03% 0.08% 302,290 161,053 396,709 11,326,290 16,968,009 1,562 0 3,834 0.01% 0.00% 0.03% 65,606 0 161,053 11,326,290 16,968,009 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,326,290 16,968,009 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,326,290 16,968,009 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,326,290 16,968,009 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,326,290 16,968,009 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 34 of 58 December 2016 ------- F.5 - CL with OT Total Number of Number of UCMR 90% CI on Number of UCMR 2 Systems with Predicted Mean Percentage of Systems with 90% CI on Percentage of Systems with Predicted Mean Exceeding Total Number of Systems with Mean Exceeding 90% CI on Number of Systems with Mean Exceeding Threshold - National Source Water Type Threshold National Number of Systems 2 Systems with Predicted Mean Exceeding Threshold Exceeding Threshold Predicted Mean Exceeding Threshold - National Extrapolation Threshold - National Extrapolation Extrapolation (ng/L) UCMR2 Systems Lower Bound Upper Bound Lower Bound Upper Bound Threshold - National Extrapolation Lower Bound Upper Bound SMALL SYSTEMS (Serving < 10,000) 0.6 1 9 0 0 0 2.06% 0.00% 0.00% 0 0 0 2 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 All Systems 20 1 9 0 0 0 0.00% 0.00% 0.00% 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 0.6 1 9 0 0 0 2.06% 0.00% 0.00% 0 0 0 2 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 10 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 1 9 0 0 0 0.00% 0.00% 0.00% 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 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 Ground Water Systems 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 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 Mixed Water Systems 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 35 of 58 December 2016 ------- F.5 - CL with OT 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) 9,001 22,661 185 0 0 2.06% 0.00% 0.00% 467 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 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 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,001 22,661 185 0 0 2.06% 0.00% 0.00% 467 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 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 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 36 of 58 December 2016 ------- F.5 - CL with OT Total Number of Number of UCMR 90% CI on Number of UCMR 2 Systems with Predicted Mean Percentage of Systems with 90% CI on Percentage of Systems with Predicted Mean Exceeding Total Number of Systems with Mean Exceeding 90% CI on Number of Systems with Mean Exceeding Threshold - National Source Water Type Threshold National Number of Systems 2 Systems with Predicted Mean Exceeding Threshold Exceeding Threshold Predicted Mean Exceeding Threshold - National Extrapolation Threshold - National Extrapolation Extrapolation (ng/L) UCMR2 Systems 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 88 0 0 0 0.78% 0.00% 0.00% 1 0 0 2 8 88 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 8 88 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 8 88 0 0 0 0.00% 0.00% 0.00% 0 0 0 All Systems 20 8 88 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 8 88 0 0 0 0.00% 0.00% 0.00% 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 0 0 0 1.50% 0.00% 0.00% 0 0 0 2 1 6 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 1 6 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 10 1 6 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 1 6 0 0 0 0.00% 0.00% 0.00% 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 0 0 0 0.71% 0.00% 0.00% 0 0 0 2 5 40 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 5 40 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 10 5 40 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 5 40 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 5 40 0 0 0 0.00% 0.00% 0.00% 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 0 0 0 0.75% 0.00% 0.00% 0 0 0 2 2 43 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 2 43 0 0 0 0.00% 0.00% 0.00% 0 0 0 Mixed Water Systems 10 2 43 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 2 43 0 0 0 0.00% 0.00% 0.00% 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 37 of 58 December 2016 ------- F.5 - CL with OT 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) 331,910 2,658,633 3,717 0 0 0.97% 0.00% 0.00% 25,730 0 0 331,910 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 0 331,910 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 0 331,910 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 0 331,910 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 1,158 0 0 1.50% 0.00% 0.00% 3,057 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 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 77,280 204,070 0 0 0 0.00% 0.00% 0.00% 0 0 0 155,528 1,022,776 1,817 0 0 1.17% 0.00% 0.00% 11,948 0 0 155,528 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 0 155,528 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 0 155,528 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 0 155,528 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 1,431,788 742 0 0 0.75% 0.00% 0.00% 10,725 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 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 99,102 1,431,788 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 38 of 58 December 2016 ------- F.5 - CL with OT Total Number of Number of UCMR 90% CI on Number of UCMR 2 Systems with Predicted Mean Percentage of Systems with 90% CI on Percentage of Systems with Predicted Mean Exceeding Total Number of Systems with Mean Exceeding 90% CI on Number of Systems with Mean Exceeding Threshold - National Source Water Type Threshold National Number of Systems 2 Systems with Predicted Mean Exceeding Threshold Exceeding Threshold Predicted Mean Exceeding Threshold - National Extrapolation Threshold - National Extrapolation Extrapolation (ng/L) UCMR2 Systems Lower Bound Upper Bound Lower Bound Upper Bound Threshold - National Extrapolation Lower Bound Upper Bound VERY LARGE SYSTEMS (Serving > 100,000) 0.6 13 13 1 1 2 9.48% 7.69% 15.38% 1 1 2 2 13 13 0 0 0 0.01% 0.00% 0.00% 0 0 0 6 13 13 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 13 13 0 0 0 0.00% 0.00% 0.00% 0 0 0 All Systems 20 13 13 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 13 13 0 0 0 0.00% 0.00% 0.00% 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 0.6 6 6 0 0 1 4.03% 0.00% 16.67% 0 0 1 2 6 6 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 6 6 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 10 6 6 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 6 6 0 0 0 0.00% 0.00% 0.00% 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 0.6 4 4 0 0 0 0.05% 0.00% 0.00% 0 0 0 2 4 4 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 4 4 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 10 4 4 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 4 4 0 0 0 0.00% 0.00% 0.00% 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 0.6 3 3 1 1 1 32.96% 33.33% 33.33% 1 1 1 2 3 3 0 0 0 0.06% 0.00% 0.00% 0 0 0 6 3 3 0 0 0 0.00% 0.00% 0.00% 0 0 0 Mixed Water Systems 10 3 3 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 3 3 0 0 0 0.00% 0.00% 0.00% 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 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 39 of 58 December 2016 ------- F.5 - CL with OT 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) 9,134,128 9,134,128 235,221 156,500 397,386 2.58% 1.71% 4.35% 235,221 156,500 397,386 9,134,128 9,134,128 293 0 0 0.00% 0.00% 0.00% 293 0 0 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 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 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 9,134,128 9,134,128 0 0 0 0.00% 0.00% 0.00% 0 0 0 7,668,042 7,668,042 80,319 0 240,886 1.05% 0.00% 3.14% 80,319 0 240,886 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 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 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 1,151,288 584 0 0 0.05% 0.00% 0.00% 584 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 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 1,151,288 1,151,288 0 0 0 0.00% 0.00% 0.00% 0 0 0 314,798 314,798 154,318 156,500 156,500 49.02% 49.71% 49.71% 154,318 156,500 156,500 314,798 314,798 293 0 0 0.09% 0.00% 0.00% 293 0 0 314,798 314,798 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 0 314,798 314,798 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 0 314,798 314,798 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 0 314,798 314,798 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 40 of 58 December 2016 ------- F.5 - CL with OT Total Number of Number of UCMR 90% CI on Number of UCMR 2 Systems with Predicted Mean Percentage of Systems with 90% CI on Percentage of Systems with Predicted Mean Exceeding Total Number of Systems with Mean Exceeding 90% CI on Number of Systems with Mean Exceeding Threshold - National Source Water Type Threshold National Number of Systems 2 Systems with Predicted Mean Exceeding Threshold Exceeding Threshold Predicted Mean Exceeding Threshold - National Extrapolation Threshold - National Extrapolation Extrapolation (ng/L) UCMR2 Systems Lower Bound Upper Bound Lower Bound Upper Bound Threshold - National Extrapolation Lower Bound Upper Bound ALL SYSTEMS 0.6 22 110 1 1 2 5.99% 4.55% 9.09% 2 1 2 2 22 110 0 0 0 0.01% 0.00% 0.00% 0 0 0 6 22 110 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 22 110 0 0 0 0.02% 0.00% 0.00% 0 0 0 All Systems 20 22 110 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 22 110 0 0 0 0.00% 0.00% 0.00% 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 0 0 1 3.46% 0.00% 12.50% 1 0 1 2 8 21 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 8 21 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 10 8 21 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 8 21 0 0 0 0.00% 0.00% 0.00% 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 0 0 0 0.42% 0.00% 0.00% 0 0 0 2 9 44 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 9 44 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 10 9 44 0 0 0 0.04% 0.00% 0.00% 0 0 0 20 9 44 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 9 44 0 0 0 0.00% 0.00% 0.00% 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 1 1 1 20.07% 20.00% 20.00% 1 1 1 2 5 46 0 0 0 0.04% 0.00% 0.00% 0 0 0 6 5 46 0 0 0 0.00% 0.00% 0.00% 0 0 0 Mixed Water Systems 10 5 46 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 5 46 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 5 46 0 0 0 0.00% 0.00% 0.00% 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 41 of 58 December 2016 ------- F.5 - CL with OT 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 9,475,038 11,815,422 239,124 156,500 397,386 2.52% 1.65% 4.19% 261,418 156,500 397,386 9,475,038 11,815,422 293 0 0 0.00% 0.00% 0.00% 293 0 0 9,475,038 11,815,422 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,475,038 11,815,422 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,475,038 11,815,422 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,475,038 11,815,422 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,475,038 11,815,422 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,475,038 11,815,422 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,475,038 11,815,422 0 0 0 0.00% 0.00% 0.00% 0 0 0 7,754,323 7,894,773 81,662 0 240,886 1.05% 0.00% 3.11% 83,843 0 240,886 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 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 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 2,401 0 0 0.18% 0.00% 0.00% 12,532 0 0 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 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 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 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 1,746,585 155,061 156,500 156,500 37.46% 37.81% 37.81% 165,043 156,500 156,500 413,900 1,746,585 293 0 0 0.07% 0.00% 0.00% 293 0 0 413,900 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 0 413,900 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 0 413,900 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 0 413,900 1,746,585 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 42 of 58 December 2016 ------- F.6-OT 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 1 9 0 0 1 16.10% 0.00% 100.00% 1 0 9 2 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 1 9 0 0 0 0.00% 0.00% 0.00% 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 16.10% 0.00% 100.00% 1 0 9 2 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 1 9 0 0 0 0.00% 0.00% 0.00% 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 43 of 58 December 2016 ------- F.6-OT 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) 40 22,661 6 0 40 16.10% 0.00% 100.00% 3,650 0 22,661 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 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 6 0 40 16.10% 0.00% 100.00% 3,650 0 22,661 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 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 44 of 58 December 2016 ------- F.6-OT 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 5 36 2 1 3 26.27% 16.99% 55.99% 9 6 20 2 5 36 1 1 1 17.25% 16.99% 16.99% 6 6 6 6 5 36 1 1 1 16.58% 16.99% 16.99% 6 6 6 10 5 36 1 0 1 9.13% 0.00% 16.99% 3 0 6 20 5 36 0 0 0 0.10% 0.00% 0.00% 0 0 0 60 5 36 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 5 36 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 5 36 0 0 0 0.00% 0.00% 0.00% 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 1 1 2 69.66% 50.00% 100.00% 9 6 12 2 2 12 1 1 1 50.66% 50.00% 50.00% 6 6 6 6 2 12 1 1 1 48.78% 50.00% 50.00% 6 6 6 10 2 12 1 0 1 26.87% 0.00% 50.00% 3 0 6 20 2 12 0 0 0 0.28% 0.00% 0.00% 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 Ground Water Systems 0.6 3 24 0 0 1 3.93% 0.00% 33.33% 1 0 8 2 3 24 0 0 0 0.06% 0.00% 0.00% 0 0 0 6 3 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 3 24 0 0 0 0.00% 0.00% 0.00% 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 45 of 58 December 2016 ------- F.6-OT 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) 225,056 1,021,805 33,533 21,805 96,515 34.43% 9.69% 42.88% 351,842 275,483 612,566 225,056 1,021,805 22,063 21,805 21,805 27.17% 9.69% 9.69% 277,605 275,483 275,483 225,056 1,021,805 21,274 21,805 21,805 26.30% 9.69% 9.69% 268,776 275,483 275,483 225,056 1,021,805 11,719 0 21,805 14.49% 0.00% 9.69% 148,059 0 275,483 225,056 1,021,805 123 0 0 0.15% 0.00% 0.00% 1,548 0 0 225,056 1,021,805 0 0 0 0.00% 0.00% 0.00% 0 0 0 225,056 1,021,805 0 0 0 0.00% 0.00% 0.00% 0 0 0 225,056 1,021,805 0 0 0 0.00% 0.00% 0.00% 0 0 0 225,056 1,021,805 0 0 0 0.00% 0.00% 0.00% 0 0 0 32,305 408,139 25,934 21,805 32,305 80.28% 67.50% 100.00% 327,651 275,483 408,139 32,305 408,139 21,943 21,805 21,805 67.92% 67.50% 67.50% 277,222 275,483 275,483 32,305 408,139 21,274 21,805 21,805 65.85% 67.50% 67.50% 268,776 275,483 275,483 32,305 408,139 11,719 0 21,805 36.28% 0.00% 67.50% 148,059 0 275,483 32,305 408,139 123 0 0 0.38% 0.00% 0.00% 1,548 0 0 32,305 408,139 0 0 0 0.00% 0.00% 0.00% 0 0 0 32,305 408,139 0 0 0 0.00% 0.00% 0.00% 0 0 0 32,305 408,139 0 0 0 0.00% 0.00% 0.00% 0 0 0 32,305 408,139 0 0 0 0.00% 0.00% 0.00% 0 0 0 192,751 613,666 7,598 0 64,210 3.94% 0.00% 33.31% 24,191 0 204,427 192,751 613,666 120 0 0 0.06% 0.00% 0.00% 383 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 0 192,751 613,666 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 46 of 58 December 2016 ------- F.6-OT 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 3 3 0 0 2 7.62% 0.00% 66.67% 0 0 2 2 3 3 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 3 3 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 3 3 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 3 3 0 0 0 0.00% 0.00% 0.00% 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 0 0 1 9.36% 0.00% 100.00% 0 0 1 2 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 1 0 0 0 0.00% 0.00% 0.00% 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 Ground Water Systems 0.6 1 1 0 0 0 1.69% 0.00% 0.00% 0 0 0 2 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 1 0 0 0 0.00% 0.00% 0.00% 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 1 1 0 0 1 11.80% 0.00% 100.00% 0 0 1 2 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 1 0 0 0 0.00% 0.00% 0.00% 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 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 47 of 58 December 2016 ------- F.6-OT 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) 701,961 701,961 56,372 0 547,673 8.03% 0.00% 78.02% 56,372 0 547,673 701,961 701,961 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 0 701,961 701,961 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 0 701,961 701,961 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 41,697 0 445,327 9.36% 0.00% 100.00% 41,697 0 445,327 445,327 445,327 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 0 445,327 445,327 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 2,600 0 0 1.69% 0.00% 0.00% 2,600 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 0 154,288 154,288 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 0 154,288 154,288 0 0 0 0.00% 0.00% 0.00% 0 0 0 102,346 102,346 12,075 0 102,346 11.80% 0.00% 100.00% 12,075 0 102,346 102,346 102,346 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 0 102,346 102,346 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 0 102,346 102,346 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 48 of 58 December 2016 ------- F.6-OT Only Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Number of UCMR 2 Systems with Predicted Mean 90% CI on Number of UCMR 2 Systems with Predicted Mean Exceeding Threshold Percentage of Systems with Predicted Mean Exceeding 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 Systems Exceeding Threshold Lower Bound Upper Bound Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound ALL SYSTEMS 0.6 9 48 2 1 6 21.12% 11.11% 66.67% 11 6 31 2 9 48 1 1 1 11.28% 11.11% 11.11% 6 6 6 6 9 48 1 1 1 10.84% 11.11% 11.11% 6 6 6 10 9 48 1 0 1 6.01% 0.00% 11.11% 3 0 6 All Systems 20 9 48 0 0 0 0.06% 0.00% 0.00% 0 0 0 60 9 48 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 9 48 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 9 48 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 9 48 0 0 0 0.00% 0.00% 0.00% 0 0 0 0.6 4 22 2 1 4 41.20% 25.00% 100.00% 10 6 22 2 4 22 1 1 1 25.33% 25.00% 25.00% 6 6 6 6 4 22 1 1 1 24.39% 25.00% 25.00% 6 6 6 Surface Water Systems 10 4 22 1 0 1 13.44% 0.00% 25.00% 3 0 6 20 4 22 0 0 0 0.14% 0.00% 0.00% 0 0 0 60 4 22 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 4 22 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 4 22 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 4 22 0 0 0 0.00% 0.00% 0.00% 0 0 0 0.6 4 25 0 0 1 3.37% 0.00% 25.00% 1 0 8 2 4 25 0 0 0 0.05% 0.00% 0.00% 0 0 0 6 4 25 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 10 4 25 0 0 0 0.09% 0.00% 0.00% 0 0 0 20 4 25 0 0 0 0.00% 0.00% 0.00% 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 0.6 1 1 0 0 1 11.80% 0.00% 100.00% 0 0 1 2 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 Mixed Water Systems 10 1 1 0 0 0 0.00% 0.00% 0.00% 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 Appendix F Six-Year Review 3 Technical Support Document for Nitrosamines Page 49 of 58 December 2016 ------- F.6-OT 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 ALL SYSTEMS 927,057 1,746,427 89,911 21,805 644,228 9.70% 2.35% 69.49% 411,864 275,483 1,182,900 927,057 1,746,427 22,063 21,805 21,805 2.38% 2.35% 2.35% 277,605 275,483 275,483 927,057 1,746,427 21,274 21,805 21,805 2.29% 2.35% 2.35% 268,776 275,483 275,483 927,057 1,746,427 11,719 0 21,805 1.26% 0.00% 2.35% 148,059 0 275,483 927,057 1,746,427 123 0 0 0.01% 0.00% 0.00% 1,548 0 0 927,057 1,746,427 0 0 0 0.00% 0.00% 0.00% 0 0 0 927,057 1,746,427 0 0 0 0.00% 0.00% 0.00% 0 0 0 927,057 1,746,427 0 0 0 0.00% 0.00% 0.00% 0 0 0 927,057 1,746,427 0 0 0 0.00% 0.00% 0.00% 0 0 0 477,672 876,128 67,638 21,805 477,672 14.16% 4.56% 100.00% 372,998 275,483 876,128 477,672 876,128 21,943 21,805 21,805 4.59% 4.56% 4.56% 277,222 275,483 275,483 477,672 876,128 21,274 21,805 21,805 4.45% 4.56% 4.56% 268,776 275,483 275,483 477,672 876,128 11,719 0 21,805 2.45% 0.00% 4.56% 148,059 0 275,483 477,672 876,128 123 0 0 0.03% 0.00% 0.00% 1,548 0 0 477,672 876,128 0 0 0 0.00% 0.00% 0.00% 0 0 0 477,672 876,128 0 0 0 0.00% 0.00% 0.00% 0 0 0 477,672 876,128 0 0 0 0.00% 0.00% 0.00% 0 0 0 477,672 876,128 0 0 0 0.00% 0.00% 0.00% 0 0 0 347,039 767,954 10,199 0 64,210 2.94% 0.00% 18.50% 26,792 0 204,427 347,039 767,954 120 0 0 0.03% 0.00% 0.00% 383 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 0 347,039 767,954 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 12,075 0 102,346 11.80% 0.00% 100.00% 12,075 0 102,346 102,346 102,346 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 0 102,346 102,346 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 0 102,346 102,346 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 50 of 58 December 2016 ------- F.7 - ND 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 55 8,222 3 1 6 4.48% 1.95% 9.87% 369 161 812 2 55 8,222 1 0 1 1.08% 0.00% 1.95% 88 0 161 6 55 8,222 0 0 0 0.05% 0.00% 0.00% 4 0 0 10 55 8,222 0 0 0 0.01% 0.00% 0.00% 1 0 0 20 55 8,222 0 0 0 0.00% 0.00% 0.00% 0 0 0 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 0 0 1 7.12% 0.00% 25.00% 3 0 9 2 4 36 0 0 0 0.09% 0.00% 0.00% 0 0 0 6 4 36 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 4 36 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 4 36 0 0 0 0.00% 0.00% 0.00% 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 2 1 5 4.47% 1.96% 9.80% 366 161 803 2 51 8,187 1 0 1 1.08% 0.00% 1.96% 88 0 161 6 51 8,187 0 0 0 0.05% 0.00% 0.00% 4 0 0 10 51 8,187 0 0 0 0.01% 0.00% 0.00% 1 0 0 20 51 8,187 0 0 0 0.00% 0.00% 0.00% 0 0 0 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 51 of 58 December 2016 ------- F.7 - ND 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) 42,570 6,985,901 2,859 306 9,684 6.71% 0.72% 22.75% 468,980 50,629 1,576,636 42,570 6,985,901 192 0 306 0.45% 0.00% 0.72% 31,748 0 50,629 42,570 6,985,901 7 0 0 0.02% 0.00% 0.00% 1,233 0 0 42,570 6,985,901 1 0 0 0.00% 0.00% 0.00% 190 0 0 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 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 42,570 6,985,901 0 0 0 0.00% 0.00% 0.00% 0 0 0 895 90,645 64 0 400 7.18% 0.00% 44.69% 6,508 0 40,512 895 90,645 1 0 0 0.14% 0.00% 0.00% 128 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 0 895 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 2,795 306 9,284 6.71% 0.73% 22.28% 462,472 50,629 1,536,124 41,675 6,895,255 191 0 306 0.46% 0.00% 0.73% 31,620 0 50,629 41,675 6,895,255 7 0 0 0.02% 0.00% 0.00% 1,233 0 0 41,675 6,895,255 1 0 0 0.00% 0.00% 0.00% 190 0 0 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 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 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 52 of 58 December 2016 ------- F.7 - ND 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 3 24 0 0 0 0.19% 0.00% 0.00% 0 0 0 2 3 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 3 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 3 24 0 0 0 0.00% 0.00% 0.00% 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 0 0 0 0.19% 0.00% 0.00% 0 0 0 2 3 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 3 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 3 24 0 0 0 0.00% 0.00% 0.00% 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 53 of 58 December 2016 ------- F.7 - ND 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) 167,731 613,666 289 0 0 0.17% 0.00% 0.00% 1,058 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 0 167,731 613,666 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 0 167,731 613,666 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 0 167,731 613,666 289 0 0 0.17% 0.00% 0.00% 1,058 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 0 167,731 613,666 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 0 167,731 613,666 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 54 of 58 December 2016 ------- F.7 - ND 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 1 1 0 0 0 0.56% 0.00% 0.00% 0 0 0 2 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 1 0 0 0 0.00% 0.00% 0.00% 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 0 0.56% 0.00% 0.00% 0 0 0 2 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 1 0 0 0 0.00% 0.00% 0.00% 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 55 of 58 December 2016 ------- F.7 - ND 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) 107,323 107,323 603 0 0 0.56% 0.00% 0.00% 603 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 0 107,323 107,323 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 0 107,323 107,323 603 0 0 0.56% 0.00% 0.00% 603 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 0 107,323 107,323 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 56 of 58 December 2016 ------- F.7 - ND 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 ALL SYSTEMS All Systems 0.6 59 8,247 3 1 6 4.37% 1.69% 10.17% 369 161 812 2 59 8,247 1 0 1 0.94% 0.00% 1.69% 88 0 161 6 59 8,247 0 0 0 0.04% 0.00% 0.00% 4 0 0 10 59 8,247 0 0 0 0.01% 0.00% 0.00% 1 0 0 20 59 8,247 0 0 0 0.00% 0.00% 0.00% 0 0 0 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 0 0 1 7.12% 0.00% 25.00% 3 0 9 2 4 36 0 0 0 0.09% 0.00% 0.00% 0 0 0 6 4 36 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 4 36 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 4 36 0 0 0 0.00% 0.00% 0.00% 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 2 1 5 4.17% 1.82% 9.09% 366 161 803 2 55 8,211 1 0 1 1.00% 0.00% 1.82% 88 0 161 6 55 8,211 0 0 0 0.04% 0.00% 0.00% 4 0 0 10 55 8,211 0 0 0 0.01% 0.00% 0.00% 1 0 0 20 55 8,211 0 0 0 0.00% 0.00% 0.00% 0 0 0 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 57 of 58 December 2016 ------- F.7 - ND 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 ALL SYSTEMS 317,624 7,706,889 3,752 306 9,684 1.18% 0.10% 3.05% 470,641 50,629 1,576,636 317,624 7,706,889 192 0 306 0.06% 0.00% 0.10% 31,748 0 50,629 317,624 7,706,889 7 0 0 0.00% 0.00% 0.00% 1,233 0 0 317,624 7,706,889 1 0 0 0.00% 0.00% 0.00% 190 0 0 317,624 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 0 317,624 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 0 317,624 7,706,889 0 0 0 0.00% 0.00% 0.00% 0 0 0 895 90,645 64 0 400 7.18% 0.00% 44.69% 6,508 0 40,512 895 90,645 1 0 0 0.14% 0.00% 0.00% 128 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 0 895 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 3,687 306 9,284 1.16% 0.10% 2.93% 464,133 50,629 1,536,124 316,729 7,616,244 191 0 306 0.06% 0.00% 0.10% 31,620 0 50,629 316,729 7,616,244 7 0 0 0.00% 0.00% 0.00% 1,233 0 0 316,729 7,616,244 1 0 0 0.00% 0.00% 0.00% 190 0 0 316,729 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 0 316,729 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 0 316,729 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 F Six-Year Review 3 Technical Support Document for Nitrosamines Page 58 of 58 December 2016 ------- Appendix G National Extrapolation of Systems and Population Served Predicted To Have a Locational Annual Average (LAA) Exceeding Thresholds Appendix G 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. Appendix G provides a national extrapolation of counts of systems (which are broken down by source water type) with predicted locational annual averages (LAAs) 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 2 of 58 December 2016 ------- G.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 LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA 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 41,962 170 136 205 20.17% 13.42% 27.67% 8,464 5,631 11,612 2 480 41,962 59 47 74 5.40% 3.26% 8.30% 2,267 1,369 3,484 6 480 41,962 26 19 34 1.83% 1.26% 2.98% 769 528 1,252 10 480 41,962 17 12 23 1.16% 0.77% 1.52% 487 322 636 20 480 41,962 9 7 14 0.46% 0.32% 0.81% 194 134 340 60 480 41,962 3 1 4 0.23% 0.19% 0.26% 95 81 107 100 480 41,962 1 0 2 0.15% 0.00% 0.21% 63 0 90 200 480 41,962 0 0 1 0.03% 0.00% 0.19% 12 0 81 600 480 41,962 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 0.6 222 1,986 116 100 131 52.23% 44.89% 59.01% 1,037 891 1,172 2 222 1,986 42 36 48 18.99% 16.22% 21.62% 377 322 429 6 222 1,986 19 14 23 8.40% 6.31% 10.36% 167 125 206 10 222 1,986 13 9 17 5.65% 4.05% 7.66% 112 81 152 20 222 1,986 8 6 11 3.43% 2.70% 4.95% 68 54 98 60 222 1,986 2 0 3 0.78% 0.00% 1.35% 16 0 27 100 222 1,986 0 0 1 0.22% 0.00% 0.45% 4 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 38 23 56 15.96% 9.58% 23.33% 6,150 3,692 8,989 2 240 38,525 6 2 12 2.65% 0.83% 5.00% 1,020 321 1,926 6 240 38,525 1 0 2 0.21% 0.00% 0.83% 82 0 321 10 240 38,525 0 0 0 0.03% 0.00% 0.00% 10 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 16 13 18 87.97% 72.22% 100.00% 1,277 1,048 1,451 2 18 1,451 11 9 14 59.95% 50.00% 77.78% 870 726 1,129 6 18 1,451 6 5 9 35.85% 27.78% 50.00% 520 403 726 10 18 1,451 5 3 6 25.15% 16.67% 33.33% 365 242 484 20 18 1,451 2 1 3 8.68% 5.56% 16.67% 126 81 242 60 18 1,451 1 1 1 5.46% 5.56% 5.56% 79 81 81 100 18 1,451 1 0 1 4.02% 0.00% 5.56% 58 0 81 200 18 1,451 0 0 1 0.84% 0.00% 5.56% 12 0 81 600 18 1,451 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 3 of 58 December 2016 ------- G.l - All Disinfection Types Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound Lower Bound Upper Bound SMALL SYSTEMS (Serving < 10,000) 1,208,921 41,154,840 337,381 271,767 413,108 16.53% 11.39% 22.90% 6,802,510 4,685,621 9,424,742 1,208,921 41,154,840 157,602 127,011 192,751 6.04% 3.89% 8.96% 2,486,019 1,600,254 3,688,867 1,208,921 41,154,840 71,860 54,381 98,432 2.09% 1.51% 3.28% 858,106 620,408 1,349,840 1,208,921 41,154,840 47,474 33,774 63,549 1.23% 0.78% 1.70% 505,211 322,864 698,526 1,208,921 41,154,840 26,802 18,560 37,715 0.55% 0.36% 0.84% 226,690 148,193 345,894 1,208,921 41,154,840 6,971 814 10,453 0.19% 0.06% 0.25% 78,107 25,584 102,828 1,208,921 41,154,840 2,339 0 8,229 0.08% 0.00% 0.22% 32,415 0 89,839 1,208,921 41,154,840 156 0 814 0.01% 0.00% 0.06% 4,110 0 25,584 1,208,921 41,154,840 0 0 0 0.00% 0.00% 0.00% 0 0 0 573,691 5,030,810 238,308 205,541 274,492 36.59% 30.75% 43.12% 1,840,819 1,546,799 2,169,436 573,691 5,030,810 120,199 104,444 135,414 15.39% 13.08% 17.65% 774,186 657,859 887,687 573,691 5,030,810 59,368 45,327 77,541 7.07% 5.29% 9.45% 355,473 265,942 475,614 573,691 5,030,810 40,452 29,434 53,972 4.69% 3.31% 6.40% 235,897 166,439 322,121 573,691 5,030,810 24,096 16,931 33,543 2.74% 1.93% 3.91% 137,597 97,026 196,492 573,691 5,030,810 5,515 0 8,824 0.64% 0.00% 1.03% 32,353 0 51,661 573,691 5,030,810 1,607 0 6,600 0.19% 0.00% 0.77% 9,418 0 38,671 573,691 5,030,810 31 0 0 0.00% 0.00% 0.00% 181 0 0 573,691 5,030,810 0 0 0 0.00% 0.00% 0.00% 0 0 0 548,364 32,448,261 42,557 22,635 69,030 8.04% 4.00% 13.46% 2,608,245 1,299,245 4,368,291 548,364 32,448,261 7,019 858 15,951 1.33% 0.12% 3.31% 433,168 38,244 1,073,511 548,364 32,448,261 650 0 3,875 0.09% 0.00% 0.54% 30,546 0 175,863 548,364 32,448,261 76 0 0 0.01% 0.00% 0.00% 3,450 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 56,516 43,591 69,586 64.03% 50.05% 78.54% 2,353,445 1,839,577 2,887,015 86,866 3,675,769 30,384 21,709 41,386 34.79% 24.60% 47.00% 1,278,665 904,151 1,727,670 86,866 3,675,769 11,843 9,054 17,016 12.84% 9.64% 19.00% 472,087 354,466 698,363 86,866 3,675,769 6,946 4,339 9,576 7.23% 4.26% 10.24% 265,863 156,425 376,405 86,866 3,675,769 2,705 1,629 4,172 2.42% 1.39% 4.06% 89,093 51,168 149,402 86,866 3,675,769 1,456 814 1,629 1.24% 0.70% 1.39% 45,754 25,584 51,168 86,866 3,675,769 732 0 1,629 0.63% 0.00% 1.39% 22,997 0 51,168 86,866 3,675,769 125 0 814 0.11% 0.00% 0.70% 3,929 0 25,584 86,866 3,675,769 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 4 of 58 December 2016 ------- G.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 LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA 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 2,812 136 106 169 45.19% 34.78% 56.48% 1,271 978 1,588 2 320 2,812 52 39 67 18.61% 14.02% 23.85% 523 394 671 6 320 2,812 20 14 28 7.05% 4.80% 11.39% 198 135 320 10 320 2,812 11 5 17 3.60% 1.15% 6.06% 101 32 170 20 320 2,812 4 1 7 0.89% 0.22% 2.13% 25 6 60 60 320 2,812 0 0 1 0.04% 0.00% 0.22% 1 0 6 100 320 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 67 57 77 55.62% 47.50% 64.17% 407 348 470 2 120 732 28 23 34 23.43% 19.17% 28.33% 172 140 207 6 120 732 12 9 14 9.89% 7.50% 11.67% 72 55 85 10 120 732 7 4 10 5.66% 3.33% 8.33% 41 24 61 20 120 732 3 1 5 2.35% 0.83% 4.17% 17 6 31 60 120 732 0 0 1 0.14% 0.00% 0.83% 1 0 6 100 120 732 0 0 0 0.01% 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 47 31 63 28.59% 19.02% 38.65% 368 245 498 2 163 1,288 12 6 18 7.06% 3.68% 11.04% 91 47 142 6 163 1,288 3 2 5 1.79% 1.23% 3.28% 23 16 42 10 163 1,288 2 1 3 0.94% 0.61% 1.84% 12 8 24 20 163 1,288 1 0 1 0.42% 0.00% 0.61% 5 0 8 60 163 1,288 0 0 0 0.01% 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 23 18 29 62.53% 48.65% 78.38% 495 385 621 2 37 792 12 10 15 32.93% 26.08% 40.54% 261 207 321 6 37 792 5 3 9 12.96% 8.11% 24.32% 103 64 193 10 37 792 2 0 4 6.03% 0.00% 10.81% 48 0 86 20 37 792 0 0 1 0.30% 0.00% 2.70% 2 0 21 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 5 of 58 December 2016 ------- G.l - All Disinfection Types Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA 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 3,696,463 2,998,904 4,526,241 26.32% 21.18% 32.46% 22,190,525 17,858,715 27,367,622 14,029,015 84,318,927 1,555,536 1,248,819 1,926,076 11.13% 8.97% 13.76% 9,387,422 7,566,594 11,601,041 14,029,015 84,318,927 550,096 362,396 758,066 3.90% 2.37% 5.55% 3,290,822 1,995,636 4,681,448 14,029,015 84,318,927 262,832 142,422 426,564 1.75% 0.65% 3.11% 1,476,388 547,087 2,624,607 14,029,015 84,318,927 73,048 13,601 151,412 0.37% 0.06% 1.04% 315,112 51,725 873,388 14,029,015 84,318,927 1,591 0 6,801 0.01% 0.00% 0.03% 6,163 0 25,863 14,029,015 84,318,927 85 0 0 0.00% 0.00% 0.00% 334 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 2,134,910 1,842,100 2,472,627 38.69% 33.12% 45.10% 9,473,598 8,109,368 11,045,090 5,187,934 24,488,354 1,000,768 835,013 1,168,969 17.49% 14.46% 20.63% 4,283,727 3,541,224 5,051,305 5,187,934 24,488,354 384,677 276,860 493,338 6.77% 4.69% 8.74% 1,658,415 1,149,187 2,140,162 5,187,934 24,488,354 199,530 137,722 291,974 3.51% 2.14% 5.48% 859,526 523,762 1,341,979 5,187,934 24,488,354 66,292 13,601 115,012 1.09% 0.21% 2.18% 267,976 51,725 533,674 5,187,934 24,488,354 1,494 0 6,801 0.02% 0.00% 0.11% 5,682 0 25,863 5,187,934 24,488,354 76 0 0 0.00% 0.00% 0.00% 291 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 33,342,501 945,402 661,821 1,289,421 12.43% 8.75% 16.87% 4,144,399 2,916,892 5,626,369 7,021,968 33,342,501 250,192 157,431 388,412 3.15% 1.95% 4.86% 1,050,774 648,706 1,621,374 7,021,968 33,342,501 50,533 25,105 95,234 0.63% 0.32% 1.17% 210,095 108,217 391,106 7,021,968 33,342,501 18,363 4,700 41,959 0.24% 0.07% 0.52% 81,115 23,325 174,290 7,021,968 33,342,501 4,533 0 9,400 0.07% 0.00% 0.14% 22,084 0 46,650 7,021,968 33,342,501 97 0 0 0.00% 0.00% 0.00% 480 0 0 7,021,968 33,342,501 9 0 0 0.00% 0.00% 0.00% 44 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 26,488,072 616,152 494,983 764,192 32.36% 25.79% 40.38% 8,572,527 6,832,455 10,696,163 1,819,112 26,488,072 304,576 256,376 368,696 15.30% 12.75% 18.61% 4,052,921 3,376,664 4,928,362 1,819,112 26,488,072 114,886 60,432 169,494 5.37% 2.79% 8.12% 1,422,312 738,232 2,150,180 1,819,112 26,488,072 44,939 0 92,631 2.02% 0.00% 4.18% 535,746 0 1,108,338 1,819,112 26,488,072 2,223 0 27,000 0.09% 0.00% 1.11% 25,051 0 293,064 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 6 of 58 December 2016 ------- G.l - All Disinfection Types 90% CI on Number of UCMR2 Percentage of 90% CI on Percentage of Systems with Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with Total Number of UCMR2 Systems Number of UCMR Systems with Predicted LRAA Systems with Predicted LRAA Exceeding Threshold - LRAA Exceeding Threshold - National Source Water Type Threshold (ng/L) National Number of 2 Systems with Predicted LRAA Exceeding Threshold Predicted LRAA Exceeding National Extrapolation Extrapolation Systems Exceeding Threshold Lower Bound Upper Bound Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound VERY LARGE SYSTEMS (Serving > 100,000) 0.6 398 398 248 212 282 62.21% 53.27% 70.85% 248 212 282 2 398 398 132 113 153 33.09% 28.39% 38.44% 132 113 153 6 398 398 42 29 56 10.49% 7.29% 14.07% 42 29 56 10 398 398 19 13 28 4.76% 3.27% 7.04% 19 13 28 All Systems 20 398 398 6 3 11 1.56% 0.75% 2.76% 6 3 11 60 398 398 1 0 1 0.21% 0.00% 0.25% 1 0 1 100 398 398 0 0 1 0.05% 0.00% 0.25% 0 0 1 200 398 398 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 0.6 218 218 134 118 148 61.24% 54.13% 67.89% 134 118 148 2 218 218 75 67 84 34.48% 30.73% 38.53% 75 67 84 6 218 218 27 22 33 12.46% 10.09% 15.14% 27 22 33 Surface Water Systems 10 218 218 14 11 18 6.65% 5.05% 8.26% 14 11 18 20 218 218 5 2 9 2.26% 0.92% 4.13% 5 2 9 60 218 218 1 0 1 0.38% 0.00% 0.46% 1 0 1 100 218 218 0 0 1 0.09% 0.00% 0.46% 0 0 1 200 218 218 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 0.6 72 72 34 24 44 46.60% 33.33% 61.11% 34 24 44 2 72 72 11 8 16 15.63% 11.11% 22.22% 11 8 16 6 72 72 1 0 3 1.59% 0.00% 4.17% 1 0 3 Ground Water Systems 10 72 72 0 0 2 0.18% 0.00% 2.78% 0 0 2 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 0.6 108 108 81 70 90 74.58% 64.81% 83.33% 81 70 90 2 108 108 45 38 53 41.91% 35.19% 49.07% 45 38 53 6 108 108 13 7 20 12.43% 6.48% 18.52% 13 7 20 Mixed Water Systems 10 108 108 4 2 8 4.00% 1.85% 7.41% 4 2 8 20 108 108 1 1 2 1.18% 0.93% 1.85% 1 1 2 60 108 108 0 0 0 0.01% 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 7 of 58 December 2016 ------- G.l - All Disinfection Types Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA 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 47,806,592 40,437,305 57,634,537 33.67% 28.48% 40.59% 47,806,592 40,437,305 57,634,537 141,981,684 141,981,684 21,459,789 18,046,207 25,246,068 15.11% 12.71% 17.78% 21,459,789 18,046,207 25,246,068 141,981,684 141,981,684 5,677,055 4,396,492 8,055,161 4.00% 3.10% 5.67% 5,677,055 4,396,492 8,055,161 141,981,684 141,981,684 2,870,908 2,131,353 3,752,259 2.02% 1.50% 2.64% 2,870,908 2,131,353 3,752,259 141,981,684 141,981,684 871,831 289,550 1,484,738 0.61% 0.20% 1.05% 871,831 289,550 1,484,738 141,981,684 141,981,684 62,607 0 101,883 0.04% 0.00% 0.07% 62,607 0 101,883 141,981,684 141,981,684 11,311 0 50,942 0.01% 0.00% 0.04% 11,311 0 50,941 141,981,684 141,981,684 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 34,278,819 29,217,132 41,185,746 38.41% 32.74% 46.15% 34,278,819 29,217,132 41,185,746 89,237,751 89,237,751 15,814,680 13,360,777 18,414,832 17.72% 14.97% 20.64% 15,814,680 13,360,777 18,414,832 89,237,751 89,237,751 4,065,821 3,209,740 5,698,060 4.56% 3.60% 6.39% 4,065,821 3,209,740 5,698,060 89,237,751 89,237,751 2,037,727 1,517,186 2,591,503 2.28% 1.70% 2.90% 2,037,727 1,517,186 2,591,503 89,237,751 89,237,751 641,680 178,591 1,140,668 0.72% 0.20% 1.28% 641,680 178,591 1,140,668 89,237,751 89,237,751 62,191 0 101,883 0.07% 0.00% 0.11% 62,191 0 101,883 89,237,751 89,237,751 11,311 0 50,942 0.01% 0.00% 0.06% 11,311 0 50,941 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 3,454,627 2,469,195 4,724,219 18.70% 13.37% 25.57% 3,454,627 2,469,195 4,724,219 18,472,835 18,472,835 1,182,043 742,246 1,803,959 6.40% 4.02% 9.77% 1,182,043 742,246 1,803,959 18,472,835 18,472,835 121,533 0 482,363 0.66% 0.00% 2.61% 121,533 0 482,363 18,472,835 18,472,835 12,857 0 67,277 0.07% 0.00% 0.36% 12,857 0 67,277 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 10,073,147 8,750,978 11,724,572 29.39% 25.53% 34.21% 10,073,147 8,750,978 11,724,572 34,271,098 34,271,098 4,463,066 3,943,185 5,027,276 13.02% 11.51% 14.67% 4,463,066 3,943,185 5,027,276 34,271,098 34,271,098 1,489,701 1,186,752 1,874,738 4.35% 3.46% 5.47% 1,489,701 1,186,752 1,874,738 34,271,098 34,271,098 820,324 614,167 1,093,479 2.39% 1.79% 3.19% 820,324 614,167 1,093,479 34,271,098 34,271,098 230,151 110,959 344,070 0.67% 0.32% 1.00% 230,151 110,959 344,070 34,271,098 34,271,098 416 0 0 0.00% 0.00% 0.00% 416 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 8 of 58 December 2016 ------- G.l - All Disinfection Types 90% CI on Number of UCMR2 Percentage of 90% CI on Percentage of Systems with Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with Total Number of UCMR2 Systems Number of UCMR Systems with Predicted LRAA Systems with Predicted LRAA Exceeding Threshold - LRAA Exceeding Threshold - National Source Water Type Threshold (ng/L) National Number of 2 Systems with Predicted LRAA Exceeding Threshold Predicted LRAA Exceeding National Extrapolation Extrapolation Systems Exceeding Threshold Lower Bound Upper Bound Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound ALL SYSTEMS 0.6 1,198 45,172 554 454 656 22.10% 15.10% 29.85% 9,982 6,821 13,482 2 1,198 45,172 243 199 294 6.47% 4.15% 9.54% 2,922 1,876 4,308 6 1,198 45,172 87 62 118 2.23% 1.53% 3.61% 1,009 692 1,629 10 1,198 45,172 47 30 68 1.34% 0.81% 1.85% 607 368 834 All Systems 20 1,198 45,172 19 11 32 0.50% 0.32% 0.91% 225 143 411 60 1,198 45,172 4 1 6 0.21% 0.18% 0.25% 97 81 115 100 1,198 45,172 1 0 3 0.14% 0.00% 0.20% 63 0 91 200 1,198 45,172 0 0 1 0.03% 0.00% 0.18% 12 0 81 600 1,198 45,172 0 0 0 0.00% 0.00% 0.00% 0 0 0 0.6 560 2,936 316 275 356 53.74% 46.22% 60.95% 1,578 1,357 1,790 2 560 2,936 145 126 166 21.25% 18.03% 24.55% 624 529 721 6 560 2,936 58 45 70 9.07% 6.89% 11.04% 266 202 324 Surface Water Systems 10 560 2,936 34 24 45 5.72% 3.95% 7.87% 168 116 231 20 560 2,936 15 9 25 3.07% 2.10% 4.70% 90 62 138 60 560 2,936 3 0 5 0.59% 0.00% 1.16% 17 0 34 100 560 2,936 1 0 2 0.16% 0.00% 0.34% 5 0 10 200 560 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 0.6 475 39,885 118 78 163 16.43% 9.93% 23.90% 6,552 3,961 9,531 2 475 39,885 29 16 46 2.81% 0.94% 5.23% 1,122 376 2,084 6 475 39,885 5 2 10 0.27% 0.04% 0.92% 106 16 366 Ground Water Systems 10 475 39,885 2 1 5 0.06% 0.02% 0.06% 23 8 26 20 475 39,885 1 0 1 0.01% 0.00% 0.02% 5 0 8 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 0.6 163 2,351 120 101 137 78.79% 63.94% 91.95% 1,852 1,503 2,162 2 163 2,351 68 57 82 50.02% 41.26% 63.92% 1,176 970 1,503 6 163 2,351 25 15 38 27.06% 20.17% 39.91% 636 474 938 Mixed Water Systems 10 163 2,351 11 5 18 17.73% 10.37% 24.56% 417 244 577 20 163 2,351 3 2 6 5.51% 3.47% 11.28% 130 82 265 60 163 2,351 1 1 1 3.37% 3.43% 3.43% 79 81 81 100 163 2,351 1 0 1 2.48% 0.00% 3.43% 58 0 81 200 163 2,351 0 0 1 0.52% 0.00% 3.43% 12 0 81 600 163 2,351 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 9 of 58 December 2016 ------- G.l - All Disinfection Types Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound Lower Bound Upper Bound ALL SYSTEMS 157,219,620 267,455,451 51,840,436 43,707,976 62,573,885 28.71% 23.55% 35.31% 76,799,626 62,981,641 94,426,900 157,219,620 267,455,451 23,172,927 19,422,037 27,364,895 12.46% 10.17% 15.16% 33,333,230 27,213,055 40,535,975 157,219,620 267,455,451 6,299,011 4,813,270 8,911,658 3.67% 2.62% 5.27% 9,825,982 7,012,537 14,086,449 157,219,620 267,455,451 3,181,214 2,307,548 4,242,372 1.81% 1.12% 2.65% 4,852,506 3,001,303 7,075,391 157,219,620 267,455,451 971,680 321,711 1,673,865 0.53% 0.18% 1.01% 1,413,632 489,469 2,704,020 157,219,620 267,455,451 71,169 814 119,136 0.05% 0.01% 0.09% 146,876 25,584 230,574 157,219,620 267,455,451 13,736 0 59,170 0.02% 0.00% 0.05% 44,060 0 140,781 157,219,620 267,455,451 156 0 814 0.00% 0.00% 0.01% 4,110 0 25,584 157,219,620 267,455,451 0 0 0 0.00% 0.00% 0.00% 0 0 0 94,999,376 118,756,915 36,652,036 31,264,773 43,932,865 38.39% 32.73% 45.81% 45,593,236 38,873,300 54,400,271 94,999,376 118,756,915 16,935,647 14,300,234 19,719,215 17.58% 14.79% 20.51% 20,872,592 17,559,860 24,353,824 94,999,376 118,756,915 4,509,866 3,531,927 6,268,939 5.12% 3.89% 7.00% 6,079,709 4,624,870 8,313,836 94,999,376 118,756,915 2,277,708 1,684,342 2,937,449 2.64% 1.86% 3.58% 3,133,151 2,207,387 4,255,602 94,999,376 118,756,915 732,068 209,124 1,289,223 0.88% 0.28% 1.58% 1,047,253 327,342 1,870,834 94,999,376 118,756,915 69,200 0 117,508 0.08% 0.00% 0.15% 100,227 0 179,406 94,999,376 118,756,915 12,995 0 57,542 0.02% 0.00% 0.08% 21,020 0 89,613 94,999,376 118,756,915 31 0 0 0.00% 0.00% 0.00% 181 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 4,442,586 3,153,651 6,082,670 12.11% 7.93% 17.47% 10,207,271 6,685,332 14,718,879 26,043,167 84,263,597 1,439,254 900,534 2,208,321 3.16% 1.70% 5.34% 2,665,986 1,429,196 4,498,843 26,043,167 84,263,597 172,715 25,105 581,472 0.43% 0.13% 1.25% 362,174 108,217 1,049,332 26,043,167 84,263,597 31,296 4,700 109,236 0.12% 0.03% 0.29% 97,422 23,325 241,567 26,043,167 84,263,597 4,533 0 9,400 0.03% 0.00% 0.06% 22,084 0 46,650 26,043,167 84,263,597 97 0 0 0.00% 0.00% 0.00% 480 0 0 26,043,167 84,263,597 9 0 0 0.00% 0.00% 0.00% 44 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 10,745,814 9,289,552 12,558,350 32.59% 27.04% 39.28% 20,999,119 17,423,010 25,307,750 36,177,076 64,434,939 4,798,026 4,221,270 5,437,359 15.20% 12.76% 18.13% 9,794,652 8,224,000 11,683,308 36,177,076 64,434,939 1,616,429 1,256,238 2,061,248 5.25% 3.54% 7.33% 3,384,100 2,279,450 4,723,281 36,177,076 64,434,939 872,209 618,506 1,195,686 2.52% 1.20% 4.00% 1,621,933 770,592 2,578,222 36,177,076 64,434,939 235,079 112,587 375,242 0.53% 0.25% 1.22% 344,295 162,126 786,536 36,177,076 64,434,939 1,872 814 1,629 0.07% 0.04% 0.08% 46,169 25,584 51,168 36,177,076 64,434,939 732 0 1,629 0.04% 0.00% 0.08% 22,997 0 51,168 36,177,076 64,434,939 125 0 814 0.01% 0.00% 0.04% 3,929 0 25,584 36,177,076 64,434,939 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 10 of 58 December 2016 ------- G.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 LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA 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 31,621 120 96 146 18.49% 12.49% 25.37% 5,847 3,951 8,022 2 378 31,621 23 16 31 2.56% 1.16% 4.43% 808 366 1,402 6 378 31,621 4 2 7 0.19% 0.06% 0.90% 59 18 286 10 378 31,621 2 1 3 0.07% 0.03% 0.08% 21 9 27 20 378 31,621 1 1 2 0.03% 0.03% 0.06% 10 9 18 60 378 31,621 0 0 1 0.01% 0.00% 0.03% 4 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 86 74 98 45.93% 39.18% 52.13% 772 659 877 2 188 1,682 18 14 22 9.67% 7.45% 11.70% 163 125 197 6 188 1,682 4 2 5 1.98% 1.06% 2.66% 33 18 45 10 188 1,682 2 1 3 1.08% 0.53% 1.60% 18 9 27 20 188 1,682 1 1 2 0.59% 0.53% 1.06% 10 9 18 60 188 1,682 0 0 1 0.24% 0.00% 0.53% 4 0 9 100 188 1,682 0 0 0 0.02% 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 29 19 41 15.91% 10.38% 22.40% 4,675 3,050 6,581 2 183 29,375 3 1 6 1.73% 0.55% 3.28% 509 161 963 6 183 29,375 0 0 1 0.07% 0.00% 0.55% 20 0 161 10 183 29,375 0 0 0 0.01% 0.00% 0.00% 2 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 5 3 7 70.87% 42.86% 100.00% 400 242 564 2 7 564 2 1 3 24.18% 14.29% 42.86% 136 81 242 6 7 564 0 0 1 1.10% 0.00% 14.29% 6 0 81 10 7 564 0 0 0 0.03% 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 11 of 58 December 2016 ------- G.2-CL Only Population 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Percent of Population Served 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served 90% CI on Total Pop. Served by Systems with LRAA Exceeding Total Population Served by UCMR2 National Population Served Served by UCMR2 Systems with Predicted LRAA Exceeding Exceeding Threshold by Systems with Predicted LRAA Exceeding Threshold - by Systems with LRAA Exceeding Threshold - National Threshold - National Extrapolation Systems by Systems Threshold Lower Bound Upper Bound National Extrapolation Lower Bound Upper Bound Extrapolation Lower Bound Upper Bound SMALL SYSTEMS (Serving < 10,000) 960,847 30,431,590 174,016 133,282 219,850 11.46% 7.82% 15.82% 3,486,149 2,379,552 4,814,860 960,847 30,431,590 39,785 25,781 55,084 2.47% 1.16% 3.93% 752,108 351,615 1,194,928 960,847 30,431,590 8,528 4,406 17,894 0.32% 0.14% 1.12% 95,930 42,226 340,296 960,847 30,431,590 3,168 456 6,770 0.10% 0.01% 0.21% 31,473 4,370 64,880 960,847 30,431,590 697 456 2,431 0.02% 0.01% 0.08% 6,681 4,370 23,298 960,847 30,431,590 114 0 456 0.00% 0.00% 0.01% 1,093 0 4,370 960,847 30,431,590 8 0 0 0.00% 0.00% 0.00% 74 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 4,260,326 129,626 106,355 153,778 29.16% 23.93% 34.59% 1,242,321 1,019,290 1,473,788 444,532 4,260,326 30,693 23,212 38,742 6.90% 5.22% 8.72% 294,162 222,462 371,301 444,532 4,260,326 8,181 4,406 13,762 1.84% 0.99% 3.10% 78,405 42,226 131,897 444,532 4,260,326 3,141 456 6,770 0.71% 0.10% 1.52% 30,099 4,370 64,880 444,532 4,260,326 697 456 2,431 0.16% 0.10% 0.55% 6,681 4,370 23,298 444,532 4,260,326 114 0 456 0.03% 0.00% 0.10% 1,093 0 4,370 444,532 4,260,326 8 0 0 0.00% 0.00% 0.00% 74 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 30,006 16,516 46,995 6.15% 3.39% 9.63% 1,521,832 837,640 2,383,456 487,838 24,741,799 3,015 363 6,405 0.62% 0.07% 1.31% 152,888 18,385 324,850 487,838 24,741,799 179 0 1,925 0.04% 0.00% 0.39% 9,067 0 97,631 487,838 24,741,799 23 0 0 0.00% 0.00% 0.00% 1,166 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 14,383 10,411 19,077 50.51% 36.56% 66.99% 721,996 522,623 957,616 28,477 1,429,466 6,077 2,207 9,936 21.34% 7.75% 34.89% 305,058 110,768 498,776 28,477 1,429,466 168 0 2,207 0.59% 0.00% 7.75% 8,458 0 110,768 28,477 1,429,466 4 0 0 0.01% 0.00% 0.00% 207 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 12 of 58 December 2016 ------- G.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 LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA 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 75 56 96 34.15% 25.42% 43.85% 711 529 912 2 240 2,081 16 11 22 8.72% 5.98% 11.47% 181 124 239 6 240 2,081 4 2 7 2.45% 1.41% 4.43% 51 29 92 10 240 2,081 2 1 4 1.41% 0.38% 2.73% 29 8 57 20 240 2,081 1 0 1 0.29% 0.00% 0.38% 6 0 8 60 240 2,081 0 0 0 0.01% 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 34 27 42 40.14% 31.76% 49.41% 208 165 256 2 85 519 7 5 9 8.20% 5.88% 10.59% 43 31 55 6 85 519 1 0 2 1.26% 0.00% 2.35% 7 0 12 10 85 519 0 0 1 0.13% 0.00% 1.18% 1 0 6 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 28 19 37 21.63% 14.62% 28.46% 222 150 292 2 130 1,027 5 2 7 3.49% 1.54% 5.38% 36 16 55 6 130 1,027 1 1 2 0.84% 0.77% 1.54% 9 8 16 10 130 1,027 1 1 1 0.76% 0.77% 0.77% 8 8 8 20 130 1,027 1 0 1 0.51% 0.00% 0.77% 5 0 8 60 130 1,027 0 0 0 0.02% 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 13 10 17 52.40% 40.00% 68.00% 280 214 364 2 25 535 5 4 6 19.26% 14.60% 24.00% 103 78 128 6 25 535 2 1 3 6.70% 4.00% 12.00% 36 21 64 10 25 535 1 0 2 3.90% 0.00% 8.00% 21 0 43 20 25 535 0 0 0 0.14% 0.00% 0.00% 1 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 13 of 58 December 2016 ------- G.2-CL Only Population 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Percent of Population Served 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served 90% CI on Total Pop. Served by Systems with LRAA Exceeding Total Population Served by UCMR2 National Population Served Served by UCMR2 Systems with Predicted LRAA Exceeding Exceeding Threshold by Systems with Predicted LRAA Exceeding Threshold - by Systems with LRAA Exceeding Threshold - National Threshold - National Extrapolation Systems by Systems Threshold Lower Bound Upper Bound National Extrapolation Lower Bound Upper Bound Extrapolation Lower Bound Upper Bound LARGE SYSTEMS (Serving 10,001 -100,000) 9,965,053 61,835,442 1,469,555 1,132,984 1,848,525 16.19% 12.48% 20.46% 10,013,767 7,720,100 12,654,215 9,965,053 61,835,442 367,876 257,895 492,491 4.74% 3.61% 6.03% 2,928,247 2,230,338 3,727,433 9,965,053 61,835,442 72,639 30,157 121,961 1.17% 0.57% 1.82% 725,790 354,240 1,124,622 9,965,053 61,835,442 23,348 4,700 65,373 0.37% 0.04% 0.95% 230,876 23,325 584,468 9,965,053 61,835,442 4,370 0 9,400 0.04% 0.00% 0.08% 23,987 0 46,650 9,965,053 61,835,442 97 0 0 0.00% 0.00% 0.00% 480 0 0 9,965,053 61,835,442 9 0 0 0.00% 0.00% 0.00% 44 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 17,345,917 824,616 655,161 1,007,245 24.26% 19.28% 29.63% 4,208,288 3,343,503 5,140,303 3,398,940 17,345,917 202,133 133,107 272,081 5.95% 3.92% 8.00% 1,031,552 679,288 1,388,518 3,398,940 17,345,917 24,703 0 54,924 0.73% 0.00% 1.62% 126,066 0 280,296 3,398,940 17,345,917 2,989 0 30,017 0.09% 0.00% 0.88% 15,256 0 153,186 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 26,592,179 380,649 274,362 502,514 7.10% 5.12% 9.38% 1,889,068 1,361,591 2,493,850 5,358,353 26,592,179 56,756 30,250 94,082 1.06% 0.56% 1.76% 281,668 150,125 466,906 5,358,353 26,592,179 11,224 9,400 15,125 0.21% 0.18% 0.28% 55,704 46,650 75,062 5,358,353 26,592,179 8,733 4,700 9,400 0.16% 0.09% 0.18% 43,340 23,325 46,650 5,358,353 26,592,179 4,137 0 9,400 0.08% 0.00% 0.18% 20,529 0 46,650 5,358,353 26,592,179 97 0 0 0.00% 0.00% 0.00% 480 0 0 5,358,353 26,592,179 9 0 0 0.00% 0.00% 0.00% 44 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 17,897,346 264,290 203,461 338,767 21.88% 16.85% 28.05% 3,916,412 3,015,005 5,020,061 1,207,761 17,897,346 108,986 94,538 126,328 9.02% 7.83% 10.46% 1,615,027 1,400,925 1,872,009 1,207,761 17,897,346 36,712 20,757 51,912 3.04% 1.72% 4.30% 544,020 307,590 769,264 1,207,761 17,897,346 11,626 0 25,956 0.96% 0.00% 2.15% 172,280 0 384,632 1,207,761 17,897,346 233 0 0 0.02% 0.00% 0.00% 3,457 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 14 of 58 December 2016 ------- G.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 LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA 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 82 64 100 39.73% 30.92% 48.31% 82 64 100 2 207 207 20 15 27 9.87% 7.25% 13.04% 20 15 27 6 207 207 6 4 9 2.87% 1.93% 4.35% 6 4 9 10 207 207 4 3 6 1.88% 1.45% 2.90% 4 3 6 20 207 207 1 0 3 0.58% 0.00% 1.45% 1 0 3 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 37 29 45 33.69% 26.36% 40.91% 37 29 45 2 110 110 7 5 9 6.26% 4.55% 8.18% 7 5 9 6 110 110 2 2 3 1.95% 1.82% 2.73% 2 2 3 10 110 110 2 2 2 1.78% 1.82% 1.82% 2 2 2 20 110 110 1 0 2 0.86% 0.00% 1.82% 1 0 2 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 15 11 20 34.24% 24.44% 44.44% 15 11 20 2 45 45 3 2 5 7.28% 4.44% 11.11% 3 2 5 6 45 45 0 0 1 0.69% 0.00% 2.22% 0 0 1 10 45 45 0 0 1 0.12% 0.00% 2.22% 0 0 1 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 30 24 35 57.27% 46.15% 67.31% 30 24 35 2 52 52 10 8 13 19.74% 15.38% 25.00% 10 8 13 6 52 52 3 2 5 6.69% 3.85% 9.62% 3 2 5 10 52 52 2 1 3 3.61% 1.92% 5.77% 2 1 3 20 52 52 0 0 1 0.49% 0.00% 1.92% 0 0 1 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 15 of 58 December 2016 ------- G.2-CL Only Population 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Percent of Population Served 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served 90% CI on Total Pop. Served by Systems with LRAA Exceeding Total Population Served by UCMR2 National Population Served Served by UCMR2 Systems with Predicted LRAA Exceeding Exceeding Threshold by Systems with Predicted LRAA Exceeding Threshold - by Systems with LRAA Exceeding Threshold - National Threshold - National Extrapolation Systems by Systems Threshold Lower Bound Upper Bound National Extrapolation Lower Bound Upper Bound Extrapolation Lower Bound Upper Bound VERY LARGE SYSTEMS (Serving > 100,000) 70,477,886 70,477,886 10,248,264 7,809,150 13,421,553 14.54% 11.08% 19.04% 10,248,264 7,809,150 13,421,553 70,477,886 70,477,886 2,488,496 1,700,923 3,360,727 3.53% 2.41% 4.77% 2,488,496 1,700,923 3,360,727 70,477,886 70,477,886 380,340 239,795 732,659 0.54% 0.34% 1.04% 380,340 239,795 732,659 70,477,886 70,477,886 192,771 139,364 318,800 0.27% 0.20% 0.45% 192,771 139,364 318,800 70,477,886 70,477,886 60,248 0 128,171 0.09% 0.00% 0.18% 60,248 0 128,171 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 7,680,165 6,060,983 9,721,772 18.61% 14.69% 23.56% 7,680,165 6,060,983 9,721,772 41,269,868 41,269,868 2,033,174 1,356,708 2,763,317 4.93% 3.29% 6.70% 2,033,174 1,356,708 2,763,317 41,269,868 41,269,868 252,253 147,700 556,943 0.61% 0.36% 1.35% 252,253 147,700 556,943 41,269,868 41,269,868 140,583 116,978 233,957 0.34% 0.28% 0.57% 140,583 116,978 233,957 41,269,868 41,269,868 57,350 0 116,978 0.14% 0.00% 0.28% 57,350 0 116,978 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 11,230,816 642,627 416,377 902,793 5.72% 3.71% 8.04% 642,627 416,377 902,793 11,230,816 11,230,816 36,140 8,786 85,024 0.32% 0.08% 0.76% 36,140 8,786 85,024 11,230,816 11,230,816 980 0 2,196 0.01% 0.00% 0.02% 980 0 2,196 11,230,816 11,230,816 115 0 2,196 0.00% 0.00% 0.02% 115 0 2,196 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 1,925,471 1,331,790 2,796,988 10.71% 7.41% 15.56% 1,925,471 1,331,790 2,796,988 17,977,203 17,977,203 419,181 335,429 512,386 2.33% 1.87% 2.85% 419,181 335,429 512,386 17,977,203 17,977,203 127,107 92,095 173,520 0.71% 0.51% 0.97% 127,107 92,095 173,520 17,977,203 17,977,203 52,073 22,386 82,646 0.29% 0.12% 0.46% 52,073 22,386 82,646 17,977,203 17,977,203 2,899 0 11,193 0.02% 0.00% 0.06% 2,899 0 11,193 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 16 of 58 December 2016 ------- G.2-CL Only Source Water Type Threshold (ng/L) Total Number of National Number of Number of UCMR 2 Systems with Predicted LRAA 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA Exceeding Threshold - National Extrapolation Systems Systems Exceeding Threshold Lower Bound Upper Bound Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound ALL SYSTEMS 0.6 825 33,909 278 216 342 19.58% 13.40% 26.64% 6,640 4,543 9,035 2 825 33,909 60 42 80 2.98% 1.49% 4.92% 1,010 506 1,667 6 825 33,909 14 8 23 0.34% 0.15% 1.14% 116 51 387 10 825 33,909 8 5 13 0.16% 0.06% 0.26% 54 20 90 All Systems 20 825 33,909 3 1 6 0.05% 0.03% 0.08% 17 9 29 60 825 33,909 0 0 1 0.01% 0.00% 0.03% 4 0 9 100 825 33,909 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 825 33,909 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 825 33,909 0 0 0 0.00% 0.00% 0.00% 0 0 0 0.6 383 2,310 158 130 185 41.13% 33.85% 48.30% 1,018 853 1,178 2 383 2,310 32 24 40 8.36% 6.27% 10.44% 212 161 261 6 383 2,310 7 4 10 1.81% 1.04% 2.61% 42 20 60 Surface Water Systems 10 383 2,310 4 3 6 1.07% 0.78% 1.57% 21 11 35 20 383 2,310 2 1 4 0.54% 0.26% 1.04% 11 9 20 60 383 2,310 0 0 1 0.12% 0.00% 0.26% 4 0 9 100 383 2,310 0 0 0 0.01% 0.00% 0.00% 0 0 0 200 383 2,310 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 383 2,310 0 0 0 0.00% 0.00% 0.00% 0 0 0 0.6 358 30,448 73 49 98 20.29% 13.69% 27.37% 4,913 3,211 6,894 2 358 30,448 11 5 18 3.07% 1.40% 5.03% 548 178 1,023 6 358 30,448 2 1 4 0.42% 0.28% 1.12% 29 8 177 Ground Water Systems 10 358 30,448 1 1 2 0.30% 0.28% 0.56% 10 8 9 20 358 30,448 1 0 1 0.19% 0.00% 0.28% 5 0 8 60 358 30,448 0 0 0 0.01% 0.00% 0.00% 0 0 0 100 358 30,448 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 358 30,448 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 358 30,448 0 0 0 0.00% 0.00% 0.00% 0 0 0 0.6 84 1,151 48 37 59 56.95% 44.05% 70.24% 710 480 963 2 84 1,151 17 13 22 19.97% 15.06% 26.19% 250 167 383 6 84 1,151 5 3 9 6.23% 3.57% 10.71% 46 23 150 Mixed Water Systems 10 84 1,151 3 1 5 3.40% 1.19% 5.95% 23 1 46 20 84 1,151 0 0 1 0.35% 0.00% 1.19% 1 0 1 60 84 1,151 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 84 1,151 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 84 1,151 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 84 1,151 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 17 of 58 December 2016 ------- G.2-CL Only Population 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Percent of Population Served 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served 90% CI on Total Pop. Served by Systems with LRAA Exceeding Total Population Served by UCMR2 National Population Served Served by UCMR2 Systems with Predicted LRAA Exceeding Exceeding Threshold by Systems with Predicted LRAA Exceeding Threshold - by Systems with LRAA Exceeding Threshold - National Threshold - National Extrapolation Systems by Systems Threshold Lower Bound Upper Bound National Extrapolation Lower Bound Upper Bound Extrapolation Lower Bound Upper Bound ALL SYSTEMS 81,403,786 162,744,918 11,891,834 9,075,416 15,489,928 14.59% 11.00% 18.98% 23,748,180 17,908,802 30,890,628 81,403,786 162,744,918 2,896,157 1,984,599 3,908,302 3.79% 2.63% 5.09% 6,168,851 4,282,876 8,283,087 81,403,786 162,744,918 461,507 274,358 872,514 0.74% 0.39% 1.35% 1,202,060 636,261 2,197,577 81,403,786 162,744,918 219,287 144,520 390,942 0.28% 0.10% 0.59% 455,120 167,059 968,148 81,403,786 162,744,918 65,315 456 140,002 0.06% 0.00% 0.12% 90,916 4,370 198,120 81,403,786 162,744,918 211 0 456 0.00% 0.00% 0.00% 1,573 0 4,370 81,403,786 162,744,918 16 0 0 0.00% 0.00% 0.00% 117 0 0 81,403,786 162,744,918 0 0 0 0.00% 0.00% 0.00% 0 0 0 81,403,786 162,744,918 0 0 0 0.00% 0.00% 0.00% 0 0 0 45,113,339 62,876,111 8,634,408 6,822,499 10,882,795 19.14% 15.12% 24.12% 13,130,774 10,423,776 16,335,863 45,113,339 62,876,111 2,266,001 1,513,027 3,074,140 5.02% 3.35% 6.81% 3,358,888 2,258,458 4,523,136 45,113,339 62,876,111 285,137 152,106 625,630 0.63% 0.34% 1.39% 456,724 189,927 969,136 45,113,339 62,876,111 146,713 117,434 270,743 0.33% 0.26% 0.60% 185,939 121,349 452,023 45,113,339 62,876,111 58,047 456 119,409 0.13% 0.00% 0.26% 64,031 4,370 140,277 45,113,339 62,876,111 114 0 456 0.00% 0.00% 0.00% 1,093 0 4,370 45,113,339 62,876,111 8 0 0 0.00% 0.00% 0.00% 74 0 0 45,113,339 62,876,111 0 0 0 0.00% 0.00% 0.00% 0 0 0 45,113,339 62,876,111 0 0 0 0.00% 0.00% 0.00% 0 0 0 17,077,006 62,564,793 1,053,282 707,255 1,452,301 6.17% 4.14% 8.50% 4,053,527 2,615,608 5,780,099 17,077,006 62,564,793 95,911 39,399 185,511 0.56% 0.23% 1.09% 470,696 177,296 876,780 17,077,006 62,564,793 12,383 9,400 19,247 0.07% 0.06% 0.11% 65,750 46,650 174,890 17,077,006 62,564,793 8,871 4,700 11,596 0.05% 0.03% 0.07% 44,621 23,325 48,846 17,077,006 62,564,793 4,137 0 9,400 0.02% 0.00% 0.06% 20,529 0 46,650 17,077,006 62,564,793 97 0 0 0.00% 0.00% 0.00% 480 0 0 17,077,006 62,564,793 9 0 0 0.00% 0.00% 0.00% 44 0 0 17,077,006 62,564,793 0 0 0 0.00% 0.00% 0.00% 0 0 0 17,077,006 62,564,793 0 0 0 0.00% 0.00% 0.00% 0 0 0 19,213,441 37,304,014 2,204,145 1,545,662 3,154,833 11.47% 8.04% 16.42% 6,563,879 4,869,418 8,774,666 19,213,441 37,304,014 534,245 432,174 648,651 2.78% 2.25% 3.38% 2,339,267 1,847,122 2,883,171 19,213,441 37,304,014 163,987 112,852 227,638 0.85% 0.59% 1.18% 679,585 399,685 1,053,552 19,213,441 37,304,014 63,703 22,386 108,602 0.33% 0.12% 0.57% 224,560 22,386 467,278 19,213,441 37,304,014 3,132 0 11,193 0.02% 0.00% 0.06% 6,356 0 11,193 19,213,441 37,304,014 0 0 0 0.00% 0.00% 0.00% 0 0 0 19,213,441 37,304,014 0 0 0 0.00% 0.00% 0.00% 0 0 0 19,213,441 37,304,014 0 0 0 0.00% 0.00% 0.00% 0 0 0 19,213,441 37,304,014 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 18 of 58 December 2016 ------- G.3 - CA Only Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Systems Number of UCMR 2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA 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 19 17 20 92.59% 70.53% 100.00% 786 599 849 2 20 849 17 14 20 66.11% 41.06% 100.00% 561 348 849 6 20 849 10 8 12 24.94% 16.88% 38.96% 212 143 331 10 20 849 8 7 9 17.40% 15.82% 17.93% 148 134 152 20 20 849 5 4 7 14.16% 12.66% 15.82% 120 107 134 60 20 849 2 1 2 10.38% 9.50% 10.55% 88 81 90 100 20 849 1 0 2 7.31% 0.00% 10.55% 62 0 90 200 20 849 0 0 1 1.45% 0.00% 9.50% 12 0 81 600 20 849 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 0.6 14 125 14 13 14 98.30% 92.86% 100.00% 123 116 125 2 14 125 13 12 14 92.03% 85.71% 100.00% 115 107 125 6 14 125 8 7 10 59.27% 50.00% 71.43% 74 63 89 10 14 125 7 6 8 47.65% 42.86% 57.14% 60 54 72 20 14 125 4 3 6 31.57% 21.43% 42.86% 40 27 54 60 14 125 1 0 1 7.06% 0.00% 7.14% 9 0 9 100 14 125 0 0 1 3.00% 0.00% 7.14% 4 0 9 200 14 125 0 0 0 0.07% 0.00% 0.00% 0 0 0 600 14 125 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 0.6 3 482 3 2 3 89.45% 66.67% 100.00% 431 321 482 2 3 482 2 1 3 63.55% 33.33% 100.00% 306 161 482 6 3 482 0 0 1 11.74% 0.00% 33.33% 57 0 161 10 3 482 0 0 0 1.50% 0.00% 0.00% 7 0 0 20 3 482 0 0 0 0.00% 0.00% 0.00% 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 3 242 3 2 3 95.88% 66.67% 100.00% 232 161 242 2 3 242 2 1 3 57.80% 33.33% 100.00% 140 81 242 6 3 242 1 1 1 33.46% 33.33% 33.33% 81 81 81 10 3 242 1 1 1 33.40% 33.33% 33.33% 81 81 81 20 3 242 1 1 1 33.33% 33.33% 33.33% 81 81 81 60 3 242 1 1 1 32.77% 33.33% 33.33% 79 81 81 100 3 242 1 0 1 24.09% 0.00% 33.33% 58 0 81 200 3 242 0 0 1 5.06% 0.00% 33.33% 12 0 81 600 3 242 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 19 of 58 December 2016 ------- G.3 - CA Only Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with 90% CI on Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation Systems with Predicted LRAA Exceeding Predicted LRAA Exceeding Threshold - LRAA Exceeding Threshold - National Threshold Lower Bound Upper Bound National Extrapolation Lower Bound Upper Bound Extrapolation Lower Bound Upper Bound SMALL SYSTEMS (Serving < 10,000) 83,754 1,335,490 67,485 56,328 79,471 69.66% 49.88% 90.95% 930,266 666,106 1,214,644 83,754 1,335,490 50,888 42,953 58,931 38.22% 24.79% 53.80% 510,430 331,071 718,524 83,754 1,335,490 30,945 27,051 38,525 19.57% 16.54% 28.14% 261,319 220,940 375,785 83,754 1,335,490 26,792 23,573 30,002 16.58% 15.02% 17.84% 221,471 200,560 238,228 83,754 1,335,490 19,433 14,164 24,310 12.96% 9.33% 15.34% 173,145 124,615 204,880 83,754 1,335,490 6,467 814 8,229 5.62% 1.92% 6.73% 75,115 25,584 89,839 83,754 1,335,490 2,303 0 8,229 2.41% 0.00% 6.73% 32,202 0 89,839 83,754 1,335,490 156 0 814 0.31% 0.00% 1.92% 4,110 0 25,584 83,754 1,335,490 0 0 0 0.00% 0.00% 0.00% 0 0 0 54,146 317,258 48,555 44,676 52,996 89.67% 82.51% 97.88% 284,496 261,768 310,520 54,146 317,258 43,555 40,015 45,826 80.44% 73.90% 84.63% 255,201 234,460 268,506 54,146 317,258 27,968 24,609 33,318 51.65% 45.45% 61.53% 163,875 144,189 195,218 54,146 317,258 24,287 21,130 27,559 44.86% 39.02% 50.90% 142,307 123,809 161,477 54,146 317,258 17,114 12,535 21,868 31.61% 23.15% 40.39% 100,274 73,448 128,128 54,146 317,258 5,011 0 6,600 9.25% 0.00% 12.19% 29,361 0 38,671 54,146 317,258 1,571 0 6,600 2.90% 0.00% 12.19% 9,206 0 38,671 54,146 317,258 31 0 0 0.06% 0.00% 0.00% 181 0 0 54,146 317,258 0 0 0 0.00% 0.00% 0.00% 0 0 0 10,110 405,603 5,859 4,395 8,310 57.95% 43.47% 82.20% 235,044 176,323 333,389 10,110 405,603 2,851 495 4,395 28.20% 4.90% 43.47% 114,397 19,859 176,323 10,110 405,603 449 0 1,950 4.44% 0.00% 19.29% 17,997 0 78,232 10,110 405,603 52 0 0 0.52% 0.00% 0.00% 2,095 0 0 10,110 405,603 0 0 0 0.00% 0.00% 0.00% 0 0 0 10,110 405,603 0 0 0 0.00% 0.00% 0.00% 0 0 0 10,110 405,603 0 0 0 0.00% 0.00% 0.00% 0 0 0 10,110 405,603 0 0 0 0.00% 0.00% 0.00% 0 0 0 10,110 405,603 0 0 0 0.00% 0.00% 0.00% 0 0 0 19,498 612,628 13,072 7,257 18,165 67.04% 37.22% 93.16% 410,725 228,015 570,735 19,498 612,628 4,482 2,443 8,711 22.99% 12.53% 44.68% 140,832 76,751 273,695 19,498 612,628 2,529 2,443 3,257 12.97% 12.53% 16.70% 79,447 76,751 102,335 19,498 612,628 2,453 2,443 2,443 12.58% 12.53% 12.53% 77,069 76,751 76,751 19,498 612,628 2,319 1,629 2,443 11.89% 8.35% 12.53% 72,871 51,168 76,751 19,498 612,628 1,456 814 1,629 7.47% 4.18% 8.35% 45,754 25,584 51,168 19,498 612,628 732 0 1,629 3.75% 0.00% 8.35% 22,997 0 51,168 19,498 612,628 125 0 814 0.64% 0.00% 4.18% 3,929 0 25,584 19,498 612,628 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 20 of 58 December 2016 ------- G.3 - CA Only Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Systems Number of UCMR 2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA 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 55 435 47 42 52 86.76% 77.61% 94.55% 377 337 411 2 55 435 29 25 34 57.67% 50.84% 65.13% 251 221 283 6 55 435 14 11 18 29.77% 22.90% 40.60% 129 100 176 10 55 435 8 4 12 15.14% 5.62% 24.72% 66 24 107 20 55 435 3 1 5 4.14% 1.40% 10.54% 18 6 46 60 55 435 0 0 1 0.24% 0.00% 1.40% 1 0 6 100 55 435 0 0 0 0.02% 0.00% 0.00% 0 0 0 200 55 435 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 55 435 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 0.6 30 183 29 27 30 95.43% 90.00% 100.00% 175 165 183 2 30 183 19 17 22 64.82% 56.67% 73.33% 119 104 134 6 30 183 10 8 11 32.65% 26.67% 36.67% 60 49 67 10 30 183 6 4 8 19.41% 13.33% 26.67% 36 24 49 20 30 183 3 1 4 8.83% 3.33% 13.33% 16 6 24 60 30 183 0 0 1 0.57% 0.00% 3.33% 1 0 6 100 30 183 0 0 0 0.04% 0.00% 0.00% 0 0 0 200 30 183 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 30 183 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 0.6 21 166 15 11 18 70.37% 52.38% 85.71% 117 87 142 2 21 166 6 4 8 27.99% 19.05% 38.10% 46 32 63 6 21 166 2 1 3 8.51% 4.76% 14.29% 14 8 24 10 21 166 1 0 2 2.57% 0.00% 9.52% 4 0 16 20 21 166 0 0 0 0.12% 0.00% 0.00% 0 0 0 60 21 166 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 21 166 0 0 0 0.00% 0.00% 0.00% 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 Mixed Water Systems 0.6 4 86 4 4 4 100.00% 100.00% 100.00% 86 86 86 2 4 86 4 4 4 99.91% 100.00% 100.00% 86 86 86 6 4 86 3 2 4 64.84% 50.00% 100.00% 56 43 86 10 4 86 1 0 2 30.38% 0.00% 50.00% 26 0 43 20 4 86 0 0 1 1.92% 0.00% 25.00% 2 0 21 60 4 86 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 4 86 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 4 86 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 4 86 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 21 of 58 December 2016 ------- G.3 - CA Only Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with 90% CI on Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation Systems with Predicted LRAA Exceeding Predicted LRAA Exceeding Threshold - LRAA 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) 2,969,366 13,281,323 1,965,436 1,717,388 2,215,382 68.29% 59.60% 77.25% 9,069,974 7,915,047 10,260,303 2,969,366 13,281,323 1,103,916 935,073 1,294,385 39.55% 33.67% 46.65% 5,252,813 4,472,115 6,195,104 2,969,366 13,281,323 454,223 321,337 597,287 16.95% 11.32% 22.55% 2,250,618 1,503,655 2,995,244 2,969,366 13,281,323 228,219 137,722 339,386 8.30% 3.94% 13.29% 1,101,888 523,762 1,764,656 2,969,366 13,281,323 66,881 13,601 131,109 2.02% 0.39% 5.19% 268,426 51,725 688,997 2,969,366 13,281,323 1,494 0 6,801 0.04% 0.00% 0.19% 5,682 0 25,863 2,969,366 13,281,323 76 0 0 0.00% 0.00% 0.00% 291 0 0 2,969,366 13,281,323 0 0 0 0.00% 0.00% 0.00% 0 0 0 2,969,366 13,281,323 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,609,787 6,122,088 1,251,114 1,153,589 1,349,997 77.72% 71.66% 83.86% 4,758,039 4,387,148 5,134,098 1,609,787 6,122,088 772,374 680,101 863,537 47.98% 42.25% 53.64% 2,937,371 2,586,452 3,284,070 1,609,787 6,122,088 341,477 265,957 416,609 21.21% 16.52% 25.88% 1,298,652 1,011,446 1,584,383 1,609,787 6,122,088 185,576 137,722 240,152 11.53% 8.56% 14.92% 705,755 523,762 913,310 1,609,787 6,122,088 64,495 13,601 104,109 4.01% 0.84% 6.47% 245,277 51,725 395,932 1,609,787 6,122,088 1,494 0 6,801 0.09% 0.00% 0.42% 5,682 0 25,863 1,609,787 6,122,088 76 0 0 0.00% 0.00% 0.00% 291 0 0 1,609,787 6,122,088 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,609,787 6,122,088 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,095,758 4,295,660 496,323 373,770 615,360 45.29% 34.11% 56.16% 1,945,718 1,465,277 2,412,372 1,095,758 4,295,660 185,059 127,181 254,614 16.89% 11.61% 23.24% 725,480 498,581 998,154 1,095,758 4,295,660 39,199 15,705 79,357 3.58% 1.43% 7.24% 153,669 61,567 311,098 1,095,758 4,295,660 9,622 0 32,559 0.88% 0.00% 2.97% 37,722 0 127,640 1,095,758 4,295,660 397 0 0 0.04% 0.00% 0.00% 1,555 0 0 1,095,758 4,295,660 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,095,758 4,295,660 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,095,758 4,295,660 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,095,758 4,295,660 0 0 0 0.00% 0.00% 0.00% 0 0 0 263,821 2,863,575 217,999 190,029 250,025 82.63% 72.03% 94.77% 2,366,216 2,062,622 2,713,833 263,821 2,863,575 146,483 127,792 176,234 55.52% 48.44% 66.80% 1,589,962 1,387,082 1,912,880 263,821 2,863,575 73,547 39,675 101,321 27.88% 15.04% 38.41% 798,297 430,642 1,099,763 263,821 2,863,575 33,020 0 66,675 12.52% 0.00% 25.27% 358,411 0 723,706 263,821 2,863,575 1,989 0 27,000 0.75% 0.00% 10.23% 21,594 0 293,064 263,821 2,863,575 0 0 0 0.00% 0.00% 0.00% 0 0 0 263,821 2,863,575 0 0 0 0.00% 0.00% 0.00% 0 0 0 263,821 2,863,575 0 0 0 0.00% 0.00% 0.00% 0 0 0 263,821 2,863,575 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 22 of 58 December 2016 ------- G.3 - CA Only Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Systems Number of UCMR 2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound Lower Bound Upper Bound VERY LARGE SYSTEMS (Serving > 100,000) All Systems 0.6 129 129 120 113 126 93.20% 87.60% 97.67% 120 113 126 2 129 129 87 79 96 67.76% 61.24% 74.42% 87 79 96 6 129 129 30 22 37 23.16% 17.05% 28.68% 30 22 37 10 129 129 13 9 19 9.96% 6.98% 14.73% 13 9 19 20 129 129 4 2 6 3.04% 1.55% 4.65% 4 2 6 60 129 129 1 0 1 0.64% 0.00% 0.78% 1 0 1 100 129 129 0 0 1 0.16% 0.00% 0.78% 0 0 1 200 129 129 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 129 129 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 0.6 84 84 79 76 82 94.57% 90.48% 97.62% 79 76 82 2 84 84 60 55 64 71.11% 65.48% 76.19% 60 55 64 6 84 84 23 19 27 27.47% 22.62% 32.14% 23 19 27 10 84 84 12 9 15 13.95% 10.71% 17.86% 12 9 15 20 84 84 4 2 6 4.65% 2.38% 7.14% 4 2 6 60 84 84 1 0 1 0.98% 0.00% 1.19% 1 0 1 100 84 84 0 0 1 0.25% 0.00% 1.19% 0 0 1 200 84 84 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 84 84 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 0.6 17 17 14 12 16 82.32% 70.59% 94.12% 14 12 16 2 17 17 8 6 10 44.70% 35.29% 58.82% 8 6 10 6 17 17 1 0 2 4.92% 0.00% 11.76% 1 0 2 10 17 17 0 0 1 0.46% 0.00% 5.88% 0 0 1 20 17 17 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 17 17 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 17 17 0 0 0 0.00% 0.00% 0.00% 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 Mixed Water Systems 0.6 28 28 27 25 28 95.68% 89.29% 100.00% 27 25 28 2 28 28 20 18 22 71.72% 64.29% 78.57% 20 18 22 6 28 28 6 3 8 21.32% 10.71% 28.57% 6 3 8 10 28 28 1 0 3 3.77% 0.00% 10.71% 1 0 3 20 28 28 0 0 0 0.05% 0.00% 0.00% 0 0 0 60 28 28 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 28 28 0 0 0 0.00% 0.00% 0.00% 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 23 of 58 December 2016 ------- G.3 - CA Only Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with 90% CI on Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation Systems with Predicted LRAA Exceeding Predicted LRAA Exceeding Threshold - LRAA 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) 40,196,393 40,196,393 26,911,355 24,758,806 29,415,120 66.95% 61.59% 73.18% 26,911,355 24,758,806 29,415,120 40,196,393 40,196,393 14,461,326 12,936,081 16,175,577 35.98% 32.18% 40.24% 14,461,326 12,936,081 16,175,577 40,196,393 40,196,393 3,929,073 3,111,942 5,069,398 9.77% 7.74% 12.61% 3,929,073 3,111,942 5,069,398 40,196,393 40,196,393 1,893,539 1,400,208 2,475,055 4.71% 3.48% 6.16% 1,893,539 1,400,208 2,475,055 40,196,393 40,196,393 581,834 178,591 969,831 1.45% 0.44% 2.41% 581,834 178,591 969,831 40,196,393 40,196,393 62,191 0 101,883 0.15% 0.00% 0.25% 62,191 0 101,883 40,196,393 40,196,393 11,311 0 50,942 0.03% 0.00% 0.13% 11,311 0 50,941 40,196,393 40,196,393 0 0 0 0.00% 0.00% 0.00% 0 0 0 40,196,393 40,196,393 0 0 0 0.00% 0.00% 0.00% 0 0 0 30,089,884 30,089,884 21,225,996 19,958,808 22,705,300 70.54% 66.33% 75.46% 21,225,996 19,958,808 22,705,300 30,089,884 30,089,884 11,756,806 10,825,298 12,726,035 39.07% 35.98% 42.29% 11,756,806 10,825,298 12,726,035 30,089,884 30,089,884 3,549,874 3,008,180 4,136,254 11.80% 10.00% 13.75% 3,549,874 3,008,180 4,136,254 30,089,884 30,089,884 1,834,008 1,400,208 2,249,827 6.10% 4.65% 7.48% 1,834,008 1,400,208 2,249,827 30,089,884 30,089,884 580,901 178,591 969,831 1.93% 0.59% 3.22% 580,901 178,591 969,831 30,089,884 30,089,884 62,191 0 101,883 0.21% 0.00% 0.34% 62,191 0 101,883 30,089,884 30,089,884 11,311 0 50,942 0.04% 0.00% 0.17% 11,311 0 50,941 30,089,884 30,089,884 0 0 0 0.00% 0.00% 0.00% 0 0 0 30,089,884 30,089,884 0 0 0 0.00% 0.00% 0.00% 0 0 0 5,268,728 5,268,728 2,643,821 2,025,480 3,409,975 50.18% 38.44% 64.72% 2,643,821 2,025,480 3,409,975 5,268,728 5,268,728 1,133,772 733,460 1,662,934 21.52% 13.92% 31.56% 1,133,772 733,460 1,662,934 5,268,728 5,268,728 120,553 0 480,166 2.29% 0.00% 9.11% 120,553 0 480,166 5,268,728 5,268,728 12,741 0 65,081 0.24% 0.00% 1.24% 12,741 0 65,081 5,268,728 5,268,728 0 0 0 0.00% 0.00% 0.00% 0 0 0 5,268,728 5,268,728 0 0 0 0.00% 0.00% 0.00% 0 0 0 5,268,728 5,268,728 0 0 0 0.00% 0.00% 0.00% 0 0 0 5,268,728 5,268,728 0 0 0 0.00% 0.00% 0.00% 0 0 0 5,268,728 5,268,728 0 0 0 0.00% 0.00% 0.00% 0 0 0 4,837,781 4,837,781 3,041,538 2,774,518 3,299,844 62.87% 57.35% 68.21% 3,041,538 2,774,518 3,299,844 4,837,781 4,837,781 1,570,748 1,377,324 1,786,607 32.47% 28.47% 36.93% 1,570,748 1,377,324 1,786,607 4,837,781 4,837,781 258,645 103,761 452,977 5.35% 2.14% 9.36% 258,645 103,761 452,977 4,837,781 4,837,781 46,790 0 160,148 0.97% 0.00% 3.31% 46,790 0 160,148 4,837,781 4,837,781 933 0 0 0.02% 0.00% 0.00% 933 0 0 4,837,781 4,837,781 0 0 0 0.00% 0.00% 0.00% 0 0 0 4,837,781 4,837,781 0 0 0 0.00% 0.00% 0.00% 0 0 0 4,837,781 4,837,781 0 0 0 0.00% 0.00% 0.00% 0 0 0 4,837,781 4,837,781 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 24 of 58 December 2016 ------- G.3 - CA Only 90% CI on Number of UCMR2 90% CI on Percentage of Systems with 90% CI on Number of Systems with Systems with Predicted LRAA Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Predicted LRAA Exceeding Threshold - LRAA Exceeding Threshold - National Total National Number of Systems Number of UCMR 2 Systems with Predicted LRAA Exceeding Threshold Exceeding Threshold National Extrapolation Total Number of Systems with Extrapolation Source Water Type Threshold (ng/L) Number of UCMR2 Systems Lower Bound Upper Bound Lower Bound Upper Bound LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound ALL SYSTEMS 0.6 204 1,412 187 172 198 90.85% 74.27% 98.11% 1,283 1,049 1,386 2 204 1,412 133 118 150 63.66% 45.91% 86.93% 899 648 1,228 6 204 1,412 54 41 67 26.27% 18.75% 38.52% 371 265 544 10 204 1,412 28 20 40 16.02% 11.87% 19.73% 226 168 279 All Systems 20 204 1,412 12 7 18 10.06% 8.18% 13.18% 142 116 186 60 204 1,412 3 1 4 6.37% 5.71% 6.84% 90 81 97 100 204 1,412 1 0 3 4.41% 0.00% 6.41% 62 0 91 200 204 1,412 0 0 1 0.87% 0.00% 5.71% 12 0 81 600 204 1,412 0 0 0 0.00% 0.00% 0.00% 0 0 0 0.6 128 392 122 116 126 95.18% 90.63% 98.44% 377 357 390 2 128 392 92 84 100 71.92% 65.63% 78.13% 294 266 323 6 128 392 41 34 48 32.16% 26.56% 37.50% 157 130 184 Surface Water Systems 10 128 392 24 19 31 18.91% 14.84% 24.22% 107 87 135 20 128 392 11 6 16 8.58% 4.69% 12.50% 60 35 84 60 128 392 2 0 3 1.55% 0.00% 2.34% 11 0 16 100 128 392 1 0 2 0.50% 0.00% 1.56% 4 0 10 200 128 392 0 0 0 0.01% 0.00% 0.00% 0 0 0 600 128 392 0 0 0 0.00% 0.00% 0.00% 0 0 0 0.6 41 665 31 25 37 76.72% 60.98% 90.24% 562 420 640 2 41 665 15 11 21 37.52% 26.83% 51.22% 360 198 555 6 41 665 3 1 6 7.26% 2.44% 14.63% 71 8 186 Ground Water Systems 10 41 665 1 0 3 1.62% 0.00% 7.32% 12 0 17 20 41 665 0 0 0 0.06% 0.00% 0.00% 0 0 0 60 41 665 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 41 665 0 0 0 0.00% 0.00% 0.00% 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 31 35 96.19% 88.57% 100.00% 344 272 355 2 35 355 26 23 29 73.75% 65.71% 82.86% 245 184 349 6 35 355 10 6 13 27.34% 17.14% 37.14% 142 126 174 Mixed Water Systems 10 35 355 3 1 6 9.35% 2.86% 17.14% 108 81 126 20 35 355 1 1 2 3.12% 2.86% 5.71% 82 81 102 60 35 355 1 1 1 2.81% 2.86% 2.86% 79 81 81 100 35 355 1 0 1 2.07% 0.00% 2.86% 58 0 81 200 35 355 0 0 1 0.43% 0.00% 2.86% 12 0 81 600 35 355 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 25 of 58 December 2016 ------- G.3 - CA Only Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound Lower Bound Upper Bound ALL SYSTEMS 43,249,513 54,813,206 28,944,277 26,532,522 31,709,973 67.34% 60.82% 74.60% 36,911,595 33,339,960 40,890,067 43,249,513 54,813,206 15,616,130 13,914,107 17,528,893 36.90% 32.36% 42.12% 20,224,568 17,739,267 23,089,205 43,249,513 54,813,206 4,414,241 3,460,330 5,705,209 11.75% 8.82% 15.40% 6,441,010 4,836,537 8,440,426 43,249,513 54,813,206 2,148,551 1,561,503 2,844,444 5.87% 3.88% 8.17% 3,216,899 2,124,530 4,477,940 43,249,513 54,813,206 668,148 206,356 1,125,250 1.87% 0.65% 3.40% 1,023,405 354,932 1,863,707 43,249,513 54,813,206 70,153 814 116,912 0.26% 0.05% 0.40% 142,989 25,584 217,585 43,249,513 54,813,206 13,691 0 59,170 0.08% 0.00% 0.26% 43,804 0 140,781 43,249,513 54,813,206 156 0 814 0.01% 0.00% 0.05% 4,110 0 25,584 43,249,513 54,813,206 0 0 0 0.00% 0.00% 0.00% 0 0 0 31,753,817 36,529,231 22,525,664 21,157,073 24,108,294 70.94% 66.63% 75.92% 26,268,532 24,607,724 28,149,918 31,753,817 36,529,231 12,572,735 11,545,414 13,635,398 39.59% 36.36% 42.94% 14,949,378 13,646,211 16,278,611 31,753,817 36,529,231 3,919,320 3,298,746 4,586,181 12.34% 10.39% 14.44% 5,012,401 4,163,815 5,915,855 31,753,817 36,529,231 2,043,872 1,559,060 2,517,538 6.44% 4.91% 7.93% 2,682,069 2,047,778 3,324,614 31,753,817 36,529,231 662,510 204,728 1,095,807 2.09% 0.64% 3.45% 926,452 303,764 1,493,891 31,753,817 36,529,231 68,696 0 115,284 0.22% 0.00% 0.36% 97,235 0 166,417 31,753,817 36,529,231 12,959 0 57,542 0.04% 0.00% 0.18% 20,807 0 89,613 31,753,817 36,529,231 31 0 0 0.00% 0.00% 0.00% 181 0 0 31,753,817 36,529,231 0 0 0 0.00% 0.00% 0.00% 0 0 0 6,374,596 9,969,990 3,146,004 2,403,645 4,033,645 49.35% 37.71% 63.28% 4,824,584 3,667,080 6,155,736 6,374,596 9,969,990 1,321,682 861,135 1,921,943 20.73% 13.51% 30.15% 1,973,649 1,251,900 2,837,411 6,374,596 9,969,990 160,200 15,705 561,473 2.51% 0.25% 8.81% 292,219 61,567 869,497 6,374,596 9,969,990 22,416 0 97,640 0.35% 0.00% 1.53% 52,559 0 192,721 6,374,596 9,969,990 397 0 0 0.01% 0.00% 0.00% 1,555 0 0 6,374,596 9,969,990 0 0 0 0.00% 0.00% 0.00% 0 0 0 6,374,596 9,969,990 0 0 0 0.00% 0.00% 0.00% 0 0 0 6,374,596 9,969,990 0 0 0 0.00% 0.00% 0.00% 0 0 0 6,374,596 9,969,990 0 0 0 0.00% 0.00% 0.00% 0 0 0 5,121,100 8,313,985 3,272,609 2,971,804 3,568,034 63.90% 58.03% 69.67% 5,818,479 5,065,155 6,584,412 5,121,100 8,313,985 1,721,713 1,507,558 1,971,552 33.62% 29.44% 38.50% 3,301,542 2,841,157 3,973,183 5,121,100 8,313,985 334,721 145,879 557,555 6.54% 2.85% 10.89% 1,136,390 611,154 1,655,075 5,121,100 8,313,985 82,263 2,443 229,265 1.61% 0.05% 4.48% 482,271 76,751 960,605 5,121,100 8,313,985 5,242 1,629 29,443 0.10% 0.03% 0.57% 95,398 51,168 369,816 5,121,100 8,313,985 1,456 814 1,629 0.03% 0.02% 0.03% 45,754 25,584 51,168 5,121,100 8,313,985 732 0 1,629 0.01% 0.00% 0.03% 22,997 0 51,168 5,121,100 8,313,985 125 0 814 0.00% 0.00% 0.02% 3,929 0 25,584 5,121,100 8,313,985 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 26 of 58 December 2016 ------- G.4 - CA with CL-OT Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Systems Number of UCMR 2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA 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 23 21 25 80.44% 60.81% 100.00% 1,007 761 1,252 2 25 1,252 19 17 21 57.29% 52.23% 72.92% 717 654 913 6 25 1,252 12 9 15 39.36% 29.33% 50.80% 493 367 636 10 25 1,252 7 4 11 25.42% 14.31% 36.49% 318 179 457 20 25 1,252 3 2 5 5.10% 1.43% 15.02% 64 18 188 60 25 1,252 0 0 1 0.22% 0.00% 0.71% 3 0 9 100 25 1,252 0 0 0 0.02% 0.00% 0.00% 0 0 0 200 25 1,252 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 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 97.62% 92.86% 100.00% 122 116 125 2 14 125 11 10 12 78.72% 71.43% 85.71% 99 89 107 6 14 125 7 5 8 47.34% 35.71% 57.14% 59 45 72 10 14 125 4 2 6 27.31% 14.29% 42.86% 34 18 54 20 14 125 2 2 3 14.77% 14.29% 21.43% 18 18 27 60 14 125 0 0 1 2.22% 0.00% 7.14% 3 0 9 100 14 125 0 0 0 0.19% 0.00% 0.00% 0 0 0 200 14 125 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 14 125 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 0.6 3 482 1 0 3 49.81% 0.00% 100.00% 240 0 482 2 3 482 0 0 1 5.18% 0.00% 33.33% 25 0 161 6 3 482 0 0 0 0.06% 0.00% 0.00% 0 0 0 10 3 482 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 3 482 0 0 0 0.00% 0.00% 0.00% 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 99.98% 100.00% 100.00% 645 645 645 2 8 645 7 7 8 92.04% 87.50% 100.00% 594 564 645 6 8 645 5 4 7 67.16% 50.00% 87.50% 433 322 564 10 8 645 4 2 5 44.03% 25.00% 62.50% 284 161 403 20 8 645 1 0 2 7.02% 0.00% 25.00% 45 0 161 60 8 645 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 8 645 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 8 645 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 8 645 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 27 of 58 December 2016 ------- G.4 - CA with CL-OT Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served bySystems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA 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 90,045 80,433 100,276 68.21% 57.49% 80.88% 1,607,300 1,354,681 1,905,874 112,710 2,356,537 65,953 58,277 75,936 45.25% 38.94% 55.68% 1,066,346 917,569 1,312,147 112,710 2,356,537 32,366 22,924 42,013 21.11% 15.16% 26.89% 497,455 357,241 633,759 112,710 2,356,537 17,513 9,745 26,777 10.70% 5.00% 16.78% 252,077 117,933 395,417 112,710 2,356,537 6,672 3,940 10,974 1.99% 0.82% 5.00% 46,864 19,208 117,716 112,710 2,356,537 390 0 1,768 0.08% 0.00% 0.37% 1,899 0 8,619 112,710 2,356,537 28 0 0 0.01% 0.00% 0.00% 139 0 0 112,710 2,356,537 0 0 0 0.00% 0.00% 0.00% 0 0 0 112,710 2,356,537 0 0 0 0.00% 0.00% 0.00% 0 0 0 65,078 317,258 58,835 54,510 62,730 90.41% 83.76% 96.39% 286,825 265,742 305,813 65,078 317,258 45,918 41,217 50,846 70.56% 63.34% 78.13% 223,856 200,938 247,880 65,078 317,258 23,219 16,313 30,461 35.68% 25.07% 46.81% 113,193 79,527 148,500 65,078 317,258 13,024 7,848 19,644 20.01% 12.06% 30.18% 63,491 38,260 95,764 65,078 317,258 6,285 3,940 9,244 9.66% 6.05% 14.20% 30,642 19,208 45,065 65,078 317,258 390 0 1,768 0.60% 0.00% 2.72% 1,899 0 8,619 65,078 317,258 28 0 0 0.04% 0.00% 0.00% 139 0 0 65,078 317,258 0 0 0 0.00% 0.00% 0.00% 0 0 0 65,078 317,258 0 0 0 0.00% 0.00% 0.00% 0 0 0 8,741 405,603 2,150 0 5,202 24.59% 0.00% 59.52% 99,751 0 241,397 8,741 405,603 209 0 2,351 2.40% 0.00% 26.89% 9,715 0 109,069 8,741 405,603 2 0 0 0.02% 0.00% 0.00% 81 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 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 8,741 405,603 0 0 0 0.00% 0.00% 0.00% 0 0 0 38,891 1,633,675 29,060 25,923 32,344 74.72% 66.66% 83.17% 1,220,724 1,088,939 1,358,664 38,891 1,633,675 19,825 17,060 22,739 50.98% 43.87% 58.47% 832,775 716,631 955,199 38,891 1,633,675 9,146 6,611 11,552 23.52% 17.00% 29.70% 384,182 277,714 485,259 38,891 1,633,675 4,489 1,897 7,134 11.54% 4.88% 18.34% 188,586 79,674 299,653 38,891 1,633,675 386 0 1,730 0.99% 0.00% 4.45% 16,222 0 72,650 38,891 1,633,675 0 0 0 0.00% 0.00% 0.00% 0 0 0 38,891 1,633,675 0 0 0 0.00% 0.00% 0.00% 0 0 0 38,891 1,633,675 0 0 0 0.00% 0.00% 0.00% 0 0 0 38,891 1,633,675 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 28 of 58 December 2016 ------- G.4 - CA with CL-OT Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Systems Number of UCMR 2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA 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 9 149 8 5 9 87.86% 61.75% 100.00% 130 92 149 2 9 149 4 2 6 49.75% 28.82% 76.16% 74 43 113 6 9 149 1 0 2 7.58% 0.00% 28.82% 11 0 43 10 9 149 0 0 0 0.57% 0.00% 0.00% 1 0 0 20 9 149 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 9 149 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 9 149 0 0 0 0.00% 0.00% 0.00% 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 Surface Water Systems 0.6 2 12 2 1 2 82.77% 50.00% 100.00% 10 6 12 2 2 12 0 0 1 16.48% 0.00% 50.00% 2 0 6 6 2 12 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 2 12 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 2 12 0 0 0 0.00% 0.00% 0.00% 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 Ground Water Systems 0.6 1 8 1 0 1 50.56% 0.00% 100.00% 4 0 8 2 1 8 0 0 0 4.68% 0.00% 0.00% 0 0 0 6 1 8 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 8 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 1 8 0 0 0 0.00% 0.00% 0.00% 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 Mixed Water Systems 0.6 6 128 5 4 6 90.64% 66.67% 100.00% 116 86 128 2 6 128 3 2 5 55.68% 33.33% 83.33% 72 43 107 6 6 128 1 0 2 8.77% 0.00% 33.33% 11 0 43 10 6 128 0 0 0 0.66% 0.00% 0.00% 1 0 0 20 6 128 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 6 128 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 6 128 0 0 0 0.00% 0.00% 0.00% 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 29 of 58 December 2016 ------- G.4 - CA with CL-OT Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served bySystems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA 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 4,908,058 162,920 107,788 246,913 48.04% 36.51% 62.54% 2,357,644 1,791,734 3,069,391 369,899 4,908,058 52,377 34,046 72,430 17.55% 11.99% 24.05% 861,375 588,657 1,180,379 369,899 4,908,058 4,627 0 16,261 1.63% 0.00% 5.73% 79,995 0 281,154 369,899 4,908,058 292 0 0 0.10% 0.00% 0.00% 5,055 0 0 369,899 4,908,058 0 0 0 0.00% 0.00% 0.00% 0 0 0 369,899 4,908,058 0 0 0 0.00% 0.00% 0.00% 0 0 0 369,899 4,908,058 0 0 0 0.00% 0.00% 0.00% 0 0 0 369,899 4,908,058 0 0 0 0.00% 0.00% 0.00% 0 0 0 369,899 4,908,058 0 0 0 0.00% 0.00% 0.00% 0 0 0 69,623 408,139 22,955 6,296 44,440 32.97% 9.04% 63.83% 134,563 36,906 260,515 69,623 408,139 2,454 0 6,296 3.52% 0.00% 9.04% 14,384 0 36,906 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 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 69,623 408,139 0 0 0 0.00% 0.00% 0.00% 0 0 0 51,848 204,555 14,758 0 51,848 28.46% 0.00% 100.00% 58,225 0 204,555 51,848 204,555 1,214 0 0 2.34% 0.00% 0.00% 4,788 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 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 4,295,363 125,207 101,493 150,624 50.40% 40.85% 60.63% 2,164,856 1,754,828 2,604,321 248,428 4,295,363 48,710 34,046 66,134 19.61% 13.70% 26.62% 842,204 588,657 1,143,473 248,428 4,295,363 4,627 0 16,261 1.86% 0.00% 6.55% 79,995 0 281,154 248,428 4,295,363 292 0 0 0.12% 0.00% 0.00% 5,055 0 0 248,428 4,295,363 0 0 0 0.00% 0.00% 0.00% 0 0 0 248,428 4,295,363 0 0 0 0.00% 0.00% 0.00% 0 0 0 248,428 4,295,363 0 0 0 0.00% 0.00% 0.00% 0 0 0 248,428 4,295,363 0 0 0 0.00% 0.00% 0.00% 0 0 0 248,428 4,295,363 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 30 of 58 December 2016 ------- G.4 - CA with CL-OT Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Systems Number of UCMR 2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA 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 38 32 44 85.34% 71.11% 97.78% 38 32 44 2 45 45 22 18 27 49.06% 40.00% 60.00% 22 18 27 6 45 45 6 3 9 12.94% 6.67% 20.00% 6 3 9 10 45 45 2 1 3 4.90% 2.22% 6.67% 2 1 3 20 45 45 1 1 2 2.37% 2.22% 4.44% 1 1 2 60 45 45 0 0 0 0.02% 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 Surface Water Systems 0.6 17 17 14 12 16 82.60% 70.59% 94.12% 14 12 16 2 17 17 8 7 10 48.76% 41.18% 58.82% 8 7 10 6 17 17 2 1 3 11.45% 5.88% 17.65% 2 1 3 10 17 17 1 0 1 4.84% 0.00% 5.88% 1 0 1 20 17 17 0 0 1 0.37% 0.00% 5.88% 0 0 1 60 17 17 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 17 17 0 0 0 0.00% 0.00% 0.00% 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 Ground Water Systems 0.6 4 4 3 1 4 69.19% 25.00% 100.00% 3 1 4 2 4 4 0 0 1 7.68% 0.00% 25.00% 0 0 1 6 4 4 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 4 4 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 4 4 0 0 0 0.00% 0.00% 0.00% 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 22 19 24 89.97% 79.17% 100.00% 22 19 24 2 24 24 13 11 16 56.16% 45.83% 66.67% 13 11 16 6 24 24 4 2 6 16.15% 8.33% 25.00% 4 2 6 10 24 24 1 1 2 5.76% 4.17% 8.33% 1 1 2 20 24 24 1 1 1 4.17% 4.17% 4.17% 1 1 1 60 24 24 0 0 0 0.05% 0.00% 0.00% 0 0 0 100 24 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 24 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 24 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 31 of 58 December 2016 ------- G.4 - CA with CL-OT Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served bySystems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA 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 9,595,352 7,707,080 11,624,369 44.91% 36.08% 54.41% 9,595,352 7,707,080 11,624,369 21,363,993 21,363,993 4,419,286 3,391,814 5,527,122 20.69% 15.88% 25.87% 4,419,286 3,391,814 5,527,122 21,363,993 21,363,993 1,365,982 1,044,756 2,235,715 6.39% 4.89% 10.46% 1,365,982 1,044,756 2,235,715 21,363,993 21,363,993 784,533 591,781 958,404 3.67% 2.77% 4.49% 784,533 591,781 958,404 21,363,993 21,363,993 229,749 110,959 386,736 1.08% 0.52% 1.81% 229,749 110,959 386,736 21,363,993 21,363,993 416 0 0 0.00% 0.00% 0.00% 416 0 0 21,363,993 21,363,993 0 0 0 0.00% 0.00% 0.00% 0 0 0 21,363,993 21,363,993 0 0 0 0.00% 0.00% 0.00% 0 0 0 21,363,993 21,363,993 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,764,629 9,764,629 4,528,257 3,164,006 5,984,999 46.37% 32.40% 61.29% 4,528,257 3,164,006 5,984,999 9,764,629 9,764,629 2,003,233 1,178,771 2,855,369 20.52% 12.07% 29.24% 2,003,233 1,178,771 2,855,369 9,764,629 9,764,629 263,694 53,860 1,004,863 2.70% 0.55% 10.29% 263,694 53,860 1,004,863 9,764,629 9,764,629 63,136 0 107,719 0.65% 0.00% 1.10% 63,136 0 107,719 9,764,629 9,764,629 3,429 0 53,860 0.04% 0.00% 0.55% 3,429 0 53,860 9,764,629 9,764,629 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,764,629 9,764,629 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,764,629 9,764,629 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,764,629 9,764,629 0 0 0 0.00% 0.00% 0.00% 0 0 0 560,393 560,393 125,506 27,338 235,249 22.40% 4.88% 41.98% 125,506 27,338 235,249 560,393 560,393 10,505 0 56,001 1.87% 0.00% 9.99% 10,505 0 56,001 560,393 560,393 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 0 560,393 560,393 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 0 560,393 560,393 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,038,971 11,038,971 4,941,589 4,515,736 5,404,121 44.76% 40.91% 48.95% 4,941,589 4,515,736 5,404,121 11,038,971 11,038,971 2,405,548 2,213,043 2,615,752 21.79% 20.05% 23.70% 2,405,548 2,213,043 2,615,752 11,038,971 11,038,971 1,102,288 990,896 1,230,853 9.99% 8.98% 11.15% 1,102,288 990,896 1,230,853 11,038,971 11,038,971 721,396 591,781 850,685 6.53% 5.36% 7.71% 721,396 591,781 850,685 11,038,971 11,038,971 226,319 110,959 332,877 2.05% 1.01% 3.02% 226,319 110,959 332,877 11,038,971 11,038,971 416 0 0 0.00% 0.00% 0.00% 416 0 0 11,038,971 11,038,971 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,038,971 11,038,971 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,038,971 11,038,971 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 32 of 58 December 2016 ------- G.4 - CA with CL-OT 90% CI on Number of UCMR2 90% CI on Percentage of Systems with 90% CI on Number of Systems with Systems with Predicted LRAA Percentage of Predicted LRAA Exceeding Threshold - Total Number of Systems with LRAA Exceeding Threshold - National Total Number of UCMR 2 Systems with Predicted LRAA Exceeding Threshold Exceeding Threshold Systems with National Extrapolation Extrapolation Source Water Type Threshold (ng/L) Number of UCMR2 Systems Number of Systems Lower Bound Upper Bound Exceeding Threshold - National Extrapolation Lower Bound Upper Bound LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound ALL SYSTEMS 0.6 79 1,445 69 58 78 81.36% 61.23% 99.93% 1,176 885 1,444 2 79 1,445 44 37 54 56.26% 49.44% 72.85% 813 715 1,053 6 79 1,445 18 12 26 35.27% 25.61% 47.58% 510 370 688 10 79 1,445 10 5 14 22.23% 12.46% 31.81% 321 180 460 All Systems 20 79 1,445 4 3 7 4.49% 1.31% 13.15% 65 19 190 60 79 1,445 0 0 1 0.19% 0.00% 0.62% 3 0 9 100 79 1,445 0 0 0 0.02% 0.00% 0.00% 0 0 0 200 79 1,445 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 79 1,445 0 0 0 0.00% 0.00% 0.00% 0 0 0 0.6 33 154 29 26 32 88.98% 78.79% 96.97% 146 134 153 2 33 154 20 17 23 59.51% 51.52% 69.70% 109 96 123 6 33 154 9 6 11 25.98% 18.18% 33.33% 61 46 75 Surface Water Systems 10 33 154 5 2 7 14.08% 6.06% 21.21% 35 18 55 20 33 154 2 2 4 6.46% 6.06% 12.12% 19 18 28 60 33 154 0 0 1 0.94% 0.00% 3.03% 3 0 9 100 33 154 0 0 0 0.08% 0.00% 0.00% 0 0 0 200 33 154 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 33 154 0 0 0 0.00% 0.00% 0.00% 0 0 0 0.6 8 493 5 1 8 59.60% 12.50% 100.00% 247 1 493 2 8 493 1 0 2 6.37% 0.00% 25.00% 26 0 162 6 8 493 0 0 0 0.02% 0.00% 0.00% 0 0 0 Ground Water Systems 10 8 493 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 8 493 0 0 0 0.00% 0.00% 0.00% 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 0.6 38 797 35 31 38 92.18% 81.58% 100.00% 783 750 797 2 38 797 24 20 29 63.64% 52.63% 76.32% 679 618 768 6 38 797 10 6 15 25.72% 15.79% 39.47% 448 324 613 Mixed Water Systems 10 38 797 5 3 7 13.01% 7.89% 18.42% 286 162 405 20 38 797 2 1 3 4.11% 2.63% 7.89% 46 1 162 60 38 797 0 0 0 0.03% 0.00% 0.00% 0 0 0 100 38 797 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 38 797 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 38 797 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 33 of 58 December 2016 ------- G.4 - CA with CL-OT Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served bySystems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound Lower Bound Upper Bound ALL SYSTEMS 21,846,602 28,628,587 9,848,317 7,895,302 11,971,558 47.37% 37.91% 57.98% 13,560,296 10,853,495 16,599,635 21,846,602 28,628,587 4,537,615 3,484,137 5,675,488 22.17% 17.11% 28.01% 6,347,007 4,898,040 8,019,648 21,846,602 28,628,587 1,402,975 1,067,680 2,293,989 6.79% 4.90% 11.01% 1,943,432 1,401,997 3,150,628 21,846,602 28,628,587 802,338 601,526 985,181 3.64% 2.48% 4.73% 1,041,665 709,714 1,353,821 21,846,602 28,628,587 236,420 114,899 397,710 0.97% 0.45% 1.76% 276,612 130,167 504,452 21,846,602 28,628,587 805 0 1,768 0.01% 0.00% 0.03% 2,315 0 8,619 21,846,602 28,628,587 28 0 0 0.00% 0.00% 0.00% 139 0 0 21,846,602 28,628,587 0 0 0 0.00% 0.00% 0.00% 0 0 0 21,846,602 28,628,587 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,899,330 10,490,027 4,610,046 3,224,812 6,092,169 46.57% 32.58% 61.54% 4,949,645 3,466,655 6,551,327 9,899,330 10,490,027 2,051,605 1,219,988 2,912,511 20.72% 12.32% 29.42% 2,241,472 1,379,708 3,140,155 9,899,330 10,490,027 286,913 70,172 1,035,324 2.90% 0.71% 10.46% 376,887 133,386 1,153,362 9,899,330 10,490,027 76,160 7,848 127,363 0.77% 0.08% 1.29% 126,628 38,260 203,483 9,899,330 10,490,027 9,715 3,940 63,104 0.10% 0.04% 0.64% 34,071 19,208 98,925 9,899,330 10,490,027 390 0 1,768 0.00% 0.00% 0.02% 1,899 0 8,619 9,899,330 10,490,027 28 0 0 0.00% 0.00% 0.00% 139 0 0 9,899,330 10,490,027 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,899,330 10,490,027 0 0 0 0.00% 0.00% 0.00% 0 0 0 620,982 1,170,551 142,414 27,338 292,299 22.93% 4.40% 47.07% 283,482 27,338 681,201 620,982 1,170,551 11,928 0 58,352 1.92% 0.00% 9.40% 25,009 0 165,070 620,982 1,170,551 2 0 0 0.00% 0.00% 0.00% 81 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 0 620,982 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 0 620,982 1,170,551 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,326,290 16,968,009 5,095,857 4,643,152 5,587,090 44.99% 40.99% 49.33% 8,327,169 7,359,503 9,367,107 11,326,290 16,968,009 2,474,083 2,264,149 2,704,625 21.84% 19.99% 23.88% 4,080,526 3,518,331 4,714,423 11,326,290 16,968,009 1,116,060 997,507 1,258,666 9.85% 8.81% 11.11% 1,566,465 1,268,611 1,997,266 11,326,290 16,968,009 726,178 593,678 857,818 6.41% 5.24% 7.57% 915,037 671,455 1,150,338 11,326,290 16,968,009 226,706 110,959 334,606 2.00% 0.98% 2.95% 242,541 110,959 405,527 11,326,290 16,968,009 416 0 0 0.00% 0.00% 0.00% 416 0 0 11,326,290 16,968,009 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,326,290 16,968,009 0 0 0 0.00% 0.00% 0.00% 0 0 0 11,326,290 16,968,009 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 34 of 58 December 2016 ------- G.5 - CL with OT Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Number of UCMR 2 Systems with Predicted LRAA 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA Exceeding Threshold - National Extrapolation Systems Exceeding Threshold Lower Bound Upper Bound Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound SMALL SYSTEMS (Serving < 10,000) 0.6 1 9 0 0 1 23.78% 0.00% 100.00% 2 0 9 2 1 9 0 0 0 0.56% 0.00% 0.00% 0 0 0 6 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 All Systems 20 1 9 0 0 0 0.00% 0.00% 0.00% 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 0.6 1 9 0 0 1 23.78% 0.00% 100.00% 2 0 9 2 1 9 0 0 0 0.56% 0.00% 0.00% 0 0 0 6 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 10 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 1 9 0 0 0 0.00% 0.00% 0.00% 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 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 Ground Water Systems 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 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 Mixed Water Systems 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 35 of 58 December 2016 ------- G.5 - CL with OT Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA 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 1,104 0 4,501 12.27% 0.00% 50.00% 2,780 0 11,331 9,001 22,661 25 0 0 0.28% 0.00% 0.00% 64 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 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 1,104 0 4,501 12.27% 0.00% 50.00% 2,780 0 11,331 9,001 22,661 25 0 0 0.28% 0.00% 0.00% 64 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 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 36 of 58 December 2016 ------- G.5 - CL with OT Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Number of UCMR 2 Systems with Predicted LRAA 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA Exceeding Threshold - National Extrapolation Systems 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 8 88 3 1 7 35.26% 8.94% 91.06% 31 8 81 2 8 88 1 0 2 9.39% 0.00% 17.87% 8 0 16 6 8 88 0 0 0 0.45% 0.00% 3.13% 0 0 3 10 8 88 0 0 0 0.03% 0.00% 0.00% 0 0 0 All Systems 20 8 88 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 8 88 0 0 0 0.00% 0.00% 0.00% 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 0 0 1 34.08% 0.00% 100.00% 2 0 6 2 1 6 0 0 0 0.19% 0.00% 0.00% 0 0 0 6 1 6 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 10 1 6 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 1 6 0 0 0 0.00% 0.00% 0.00% 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 41.27% 20.00% 80.00% 16 8 32 2 5 40 1 0 2 19.25% 0.00% 40.00% 8 0 16 6 5 40 0 0 0 1.01% 0.00% 7.00% 0 0 3 Ground Water Systems 10 5 40 0 0 0 0.07% 0.00% 0.00% 0 0 0 20 5 40 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 5 40 0 0 0 0.00% 0.00% 0.00% 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 29.87% 0.00% 100.00% 13 0 43 2 2 43 0 0 0 1.59% 0.00% 0.00% 1 0 0 6 2 43 0 0 0 0.00% 0.00% 0.00% 0 0 0 Mixed Water Systems 10 2 43 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 2 43 0 0 0 0.00% 0.00% 0.00% 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 37 of 58 December 2016 ------- G.5 - CL with OT Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA 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 40,539 13,689 100,892 11.33% 3.39% 26.57% 301,260 90,023 706,435 331,910 2,658,633 5,154 0 8,805 1.39% 0.00% 2.18% 36,874 0 57,903 331,910 2,658,633 110 0 752 0.03% 0.00% 0.19% 722 0 4,945 331,910 2,658,633 8 0 0 0.00% 0.00% 0.00% 53 0 0 331,910 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 0 331,910 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 0 331,910 2,658,633 0 0 0 0.00% 0.00% 0.00% 0 0 0 77,280 204,070 8,502 0 38,640 11.00% 0.00% 50.00% 22,451 0 102,035 77,280 204,070 36 0 0 0.05% 0.00% 0.00% 96 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 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 23,382 13,689 37,477 15.03% 8.80% 24.10% 153,765 90,023 246,453 155,528 1,022,776 4,722 0 8,805 3.04% 0.00% 5.66% 31,051 0 57,903 155,528 1,022,776 110 0 752 0.07% 0.00% 0.48% 722 0 4,945 155,528 1,022,776 8 0 0 0.01% 0.00% 0.00% 53 0 0 155,528 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 0 155,528 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 0 155,528 1,022,776 0 0 0 0.00% 0.00% 0.00% 0 0 0 99,102 1,431,788 8,655 0 24,776 8.73% 0.00% 25.00% 125,044 0 357,947 99,102 1,431,788 396 0 0 0.40% 0.00% 0.00% 5,728 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 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 38 of 58 December 2016 ------- G.5 - CL with OT Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Number of UCMR 2 Systems with Predicted LRAA 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA Exceeding Threshold - National Extrapolation Systems 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 13 13 5 2 8 37.63% 15.38% 61.54% 5 2 8 2 13 13 1 1 2 9.97% 7.69% 15.38% 1 1 2 6 13 13 0 0 1 0.71% 0.00% 7.69% 0 0 1 10 13 13 0 0 0 0.03% 0.00% 0.00% 0 0 0 All Systems 20 13 13 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 13 13 0 0 0 0.00% 0.00% 0.00% 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 0.6 6 6 3 1 4 42.29% 16.67% 66.67% 3 1 4 2 6 6 0 0 1 4.12% 0.00% 16.67% 0 0 1 6 6 6 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 10 6 6 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 6 6 0 0 0 0.00% 0.00% 0.00% 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 0.6 4 4 1 0 2 24.39% 0.00% 50.00% 1 0 2 2 4 4 0 0 0 1.22% 0.00% 0.00% 0 0 0 6 4 4 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 10 4 4 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 4 4 0 0 0 0.00% 0.00% 0.00% 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 0.6 3 3 1 1 2 45.94% 33.33% 66.67% 1 1 2 2 3 3 1 1 1 33.33% 33.33% 33.33% 1 1 1 6 3 3 0 0 1 3.06% 0.00% 33.33% 0 0 1 Mixed Water Systems 10 3 3 0 0 0 0.12% 0.00% 0.00% 0 0 0 20 3 3 0 0 0 0.00% 0.00% 0.00% 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 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 39 of 58 December 2016 ------- G.5 - CL with OT Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA 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 9,134,128 894,687 136,682 2,801,050 9.79% 1.50% 30.67% 894,687 136,682 2,801,050 9,134,128 9,134,128 74,265 17,389 157,055 0.81% 0.19% 1.72% 74,265 17,389 157,055 9,134,128 9,134,128 1,661 0 17,389 0.02% 0.00% 0.19% 1,661 0 17,389 9,134,128 9,134,128 65 0 0 0.00% 0.00% 0.00% 65 0 0 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 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 9,134,128 9,134,128 0 0 0 0.00% 0.00% 0.00% 0 0 0 7,668,042 7,668,042 738,489 33,334 2,551,011 9.63% 0.43% 33.27% 738,489 33,334 2,551,011 7,668,042 7,668,042 17,297 0 70,111 0.23% 0.00% 0.91% 17,297 0 70,111 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 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 7,668,042 7,668,042 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,151,288 1,151,288 22,267 0 77,594 1.93% 0.00% 6.74% 22,267 0 77,594 1,151,288 1,151,288 687 0 0 0.06% 0.00% 0.00% 687 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 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 0 314,798 314,798 133,931 103,348 172,445 42.55% 32.83% 54.78% 133,931 103,348 172,445 314,798 314,798 56,281 17,389 86,944 17.88% 5.52% 27.62% 56,281 17,389 86,944 314,798 314,798 1,661 0 17,389 0.53% 0.00% 5.52% 1,661 0 17,389 314,798 314,798 65 0 0 0.02% 0.00% 0.00% 65 0 0 314,798 314,798 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 0 314,798 314,798 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 0 314,798 314,798 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 40 of 58 December 2016 ------- G.5 - CL with OT Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Systems Number of UCMR 2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound Lower Bound Upper Bound ALL SYSTEMS All Systems 0.6 22 110 8 3 16 34.61% 8.97% 88.31% 38 10 97 2 22 110 2 1 4 8.74% 0.91% 16.13% 10 1 18 6 22 110 0 0 1 0.45% 0.00% 3.41% 0 0 4 10 22 110 0 0 0 0.03% 0.00% 0.00% 0 0 0 20 22 110 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 22 110 0 0 0 0.00% 0.00% 0.00% 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 Surface Water Systems 0.6 8 21 3 1 6 38.95% 12.50% 75.00% 7 1 19 2 8 21 0 0 1 3.18% 0.00% 12.50% 0 0 1 6 8 21 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 8 21 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 8 21 0 0 0 0.00% 0.00% 0.00% 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 Ground Water Systems 0.6 9 44 3 1 6 33.77% 11.11% 66.67% 17 8 34 2 9 44 1 0 2 11.24% 0.00% 22.22% 8 0 16 6 9 44 0 0 0 0.56% 0.00% 3.89% 0 0 3 10 9 44 0 0 0 0.04% 0.00% 0.00% 0 0 0 20 9 44 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 9 44 0 0 0 0.00% 0.00% 0.00% 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 Mixed Water Systems 0.6 5 46 2 1 4 39.51% 20.00% 80.00% 14 1 45 2 5 46 1 1 1 20.64% 20.00% 20.00% 2 1 1 6 5 46 0 0 1 1.84% 0.00% 20.00% 0 0 1 10 5 46 0 0 0 0.07% 0.00% 0.00% 0 0 0 20 5 46 0 0 0 0.00% 0.00% 0.00% 0 0 0 60 5 46 0 0 0 0.00% 0.00% 0.00% 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 41 of 58 December 2016 ------- G.5 - CL with OT Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound Lower Bound Upper Bound ALL SYSTEMS 9,475,038 11,815,422 936,331 150,371 2,906,442 10.15% 1.92% 29.78% 1,198,727 226,705 3,518,815 9,475,038 11,815,422 79,445 17,389 165,860 0.94% 0.15% 1.82% 111,203 17,389 214,959 9,475,038 11,815,422 1,771 0 18,141 0.02% 0.00% 0.19% 2,383 0 22,334 9,475,038 11,815,422 73 0 0 0.00% 0.00% 0.00% 118 0 0 9,475,038 11,815,422 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,475,038 11,815,422 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,475,038 11,815,422 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,475,038 11,815,422 0 0 0 0.00% 0.00% 0.00% 0 0 0 9,475,038 11,815,422 0 0 0 0.00% 0.00% 0.00% 0 0 0 7,754,323 7,894,773 748,095 33,334 2,594,151 9.65% 0.43% 33.45% 763,720 33,334 2,664,376 7,754,323 7,894,773 17,358 0 70,111 0.22% 0.00% 0.90% 17,456 0 70,111 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 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 7,754,323 7,894,773 0 0 0 0.00% 0.00% 0.00% 0 0 0 1,306,816 2,174,064 45,649 13,689 115,071 3.49% 1.05% 8.81% 176,032 90,023 324,047 1,306,816 2,174,064 5,409 0 8,805 0.41% 0.00% 0.67% 31,738 0 57,903 1,306,816 2,174,064 110 0 752 0.01% 0.00% 0.06% 722 0 4,945 1,306,816 2,174,064 8 0 0 0.00% 0.00% 0.00% 53 0 0 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 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 1,306,816 2,174,064 0 0 0 0.00% 0.00% 0.00% 0 0 0 413,900 1,746,585 142,586 103,348 197,220 34.45% 24.97% 47.65% 258,974 103,348 530,392 413,900 1,746,585 56,678 17,389 86,944 13.69% 4.20% 21.01% 62,009 17,389 86,944 413,900 1,746,585 1,661 0 17,389 0.40% 0.00% 4.20% 1,661 0 17,389 413,900 1,746,585 65 0 0 0.02% 0.00% 0.00% 65 0 0 413,900 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 0 413,900 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 0 413,900 1,746,585 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 42 of 58 December 2016 ------- G.6-OT Only Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Systems Number of UCMR 2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA 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 50.37% 0.00% 100.00% 5 0 9 2 1 9 0 0 0 2.06% 0.00% 0.00% 0 0 0 6 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 1 9 0 0 0 0.00% 0.00% 0.00% 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 50.37% 0.00% 100.00% 5 0 9 2 1 9 0 0 0 2.06% 0.00% 0.00% 0 0 0 6 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 9 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 1 9 0 0 0 0.00% 0.00% 0.00% 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 43 of 58 December 2016 ------- G.6-OT Only Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound Lower Bound Upper Bound SMALL SYSTEMS (Serving < 10,000) 40 22,661 12 0 40 29.03% 0.00% 100.00% 6,578 0 22,661 40 22,661 0 0 0 1.03% 0.00% 0.00% 233 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 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 12 0 40 29.03% 0.00% 100.00% 6,578 0 22,661 40 22,661 0 0 0 1.03% 0.00% 0.00% 233 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 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 44 of 58 December 2016 ------- G.6-OT Only Source Water Type Threshold Total Number of National Number of Number of UCMR 2 Systems with Predicted LRAA 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding 90% CI on Number of Systems with LRAA Exceeding Threshold - National Extrapolation (ng/L) UCMR2 Systems Systems Exceeding Threshold Lower Bound Upper Bound Threshold - National Extrapolation Lower Bound Upper Bound Threshold - National Extrapolation Lower Bound Upper Bound LARGE SYSTEMS (Serving 10,001 -100,000) 0.6 5 36 3 2 4 52.05% 33.98% 77.99% 19 12 28 2 5 36 1 1 3 25.00% 16.99% 55.99% 9 6 20 6 5 36 1 1 1 16.96% 16.99% 16.99% 6 6 6 10 5 36 1 0 1 14.48% 0.00% 16.99% 5 0 6 All Systems 20 5 36 0 0 1 2.80% 0.00% 16.99% 1 0 6 60 5 36 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 5 36 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 5 36 0 0 0 0.00% 0.00% 0.00% 0 0 0 600 5 36 0 0 0 0.00% 0.00% 0.00% 0 0 0 0.6 2 12 2 2 2 99.81% 100.00% 100.00% 12 12 12 2 2 12 1 1 2 68.73% 50.00% 100.00% 8 6 12 6 2 12 1 1 1 49.91% 50.00% 50.00% 6 6 6 Surface Water Systems 10 2 12 1 0 1 42.60% 0.00% 50.00% 5 0 6 20 2 12 0 0 1 8.24% 0.00% 50.00% 1 0 6 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 3 24 1 0 2 27.47% 0.00% 66.67% 7 0 16 2 3 24 0 0 1 2.50% 0.00% 33.33% 1 0 8 6 3 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 10 3 24 0 0 0 0.00% 0.00% 0.00% 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 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 Mixed Water Systems 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 45 of 58 December 2016 ------- G.6-OT Only Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA 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 55,507 27,055 99,025 42.94% 33.45% 60.73% 438,712 341,811 620,557 225,056 1,021,805 26,180 21,805 57,966 30.14% 26.96% 43.08% 307,994 275,483 440,222 225,056 1,021,805 18,498 10,903 21,805 22.87% 13.48% 26.96% 233,696 137,741 275,483 225,056 1,021,805 10,964 0 21,805 13.56% 0.00% 26.96% 138,515 0 275,483 225,056 1,021,805 1,797 0 10,903 2.22% 0.00% 13.48% 22,699 0 137,741 225,056 1,021,805 0 0 0 0.00% 0.00% 0.00% 0 0 0 225,056 1,021,805 0 0 0 0.00% 0.00% 0.00% 0 0 0 225,056 1,021,805 0 0 0 0.00% 0.00% 0.00% 0 0 0 225,056 1,021,805 0 0 0 0.00% 0.00% 0.00% 0 0 0 32,305 408,139 27,724 27,055 32,305 85.82% 83.75% 100.00% 350,257 341,811 408,139 32,305 408,139 23,771 21,805 27,055 73.58% 67.50% 83.75% 300,325 275,483 341,811 32,305 408,139 18,498 10,903 21,805 57.26% 33.75% 67.50% 233,696 137,741 275,483 32,305 408,139 10,964 0 21,805 33.94% 0.00% 67.50% 138,515 0 275,483 32,305 408,139 1,797 0 10,903 5.56% 0.00% 33.75% 22,699 0 137,741 32,305 408,139 0 0 0 0.00% 0.00% 0.00% 0 0 0 32,305 408,139 0 0 0 0.00% 0.00% 0.00% 0 0 0 32,305 408,139 0 0 0 0.00% 0.00% 0.00% 0 0 0 32,305 408,139 0 0 0 0.00% 0.00% 0.00% 0 0 0 192,751 613,666 27,783 0 66,720 14.41% 0.00% 34.61% 88,455 0 212,418 192,751 613,666 2,409 0 30,911 1.25% 0.00% 16.04% 7,669 0 98,410 192,751 613,666 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 0 192,751 613,666 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 46 of 58 December 2016 ------- G.6-OT Only Source Water Type Threshold Total Number of National Number of Number of UCMR 2 Systems with Predicted LRAA 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding 90% CI on Number of Systems with LRAA Exceeding Threshold - National Extrapolation (ng/L) UCMR2 Systems Systems Exceeding Threshold Lower Bound Upper Bound Threshold - National Extrapolation Lower Bound Upper Bound Threshold - National Extrapolation Lower Bound Upper Bound VERY LARGE SYSTEMS (Serving > 100,000) 0.6 3 3 2 1 3 59.24% 33.33% 100.00% 2 1 3 2 3 3 0 0 1 16.10% 0.00% 33.33% 0 0 1 6 3 3 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 3 3 0 0 0 0.00% 0.00% 0.00% 0 0 0 All Systems 20 3 3 0 0 0 0.00% 0.00% 0.00% 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 0.6 1 1 0 0 1 43.45% 0.00% 100.00% 0 0 1 2 1 1 0 0 0 1.87% 0.00% 0.00% 0 0 0 6 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 Surface Water Systems 10 1 1 0 0 0 0.00% 0.00% 0.00% 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 0.6 1 1 0 0 1 34.27% 0.00% 100.00% 0 0 1 2 1 1 0 0 0 2.43% 0.00% 0.00% 0 0 0 6 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 Ground Water Systems 10 1 1 0 0 0 0.00% 0.00% 0.00% 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 0.6 1 1 1 1 1 100.00% 100.00% 100.00% 1 1 1 2 1 1 0 0 1 44.01% 0.00% 100.00% 0 0 1 6 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 Mixed Water Systems 10 1 1 0 0 0 0.00% 0.00% 0.00% 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 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 47 of 58 December 2016 ------- G.6-OT Only Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound Lower Bound Upper Bound VERY LARGE SYSTEMS (Serving > 100,000) 701,961 701,961 154,803 25,587 350,981 22.05% 3.65% 50.00% 154,803 25,587 350,981 701,961 701,961 16,417 0 25,587 2.34% 0.00% 3.65% 16,417 0 25,587 701,961 701,961 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 0 701,961 701,961 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 0 701,961 701,961 0 0 0 0.00% 0.00% 0.00% 0 0 0 445,327 445,327 105,911 0 222,664 23.78% 0.00% 50.00% 105,911 0 222,664 445,327 445,327 4,170 0 0 0.94% 0.00% 0.00% 4,170 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 0 445,327 445,327 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 18,275 0 77,144 11.84% 0.00% 50.00% 18,275 0 77,144 154,288 154,288 939 0 0 0.61% 0.00% 0.00% 939 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 0 154,288 154,288 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 30,618 25,587 51,173 29.92% 25.00% 50.00% 30,618 25,587 51,173 102,346 102,346 11,308 0 25,587 11.05% 0.00% 25.00% 11,308 0 25,587 102,346 102,346 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 0 102,346 102,346 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 0 102,346 102,346 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 48 of 58 December 2016 ------- G.6-OT Only Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Systems Number of UCMR 2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound Lower Bound Upper Bound ALL SYSTEMS All Systems 0.6 9 48 5 3 8 52.19% 27.59% 83.49% 25 13 40 2 9 48 2 1 4 20.16% 12.75% 44.10% 10 6 21 6 9 48 1 1 1 12.73% 12.75% 12.75% 6 6 6 10 9 48 1 0 1 10.86% 0.00% 12.75% 5 0 6 20 9 48 0 0 1 2.10% 0.00% 12.75% 1 0 6 60 9 48 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 9 48 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 9 48 0 0 0 0.00% 0.00% 0.00% 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 73.36% 50.00% 100.00% 17 12 22 2 4 22 1 1 2 35.35% 25.00% 50.00% 9 6 12 6 4 22 1 1 1 24.95% 25.00% 25.00% 6 6 6 10 4 22 1 0 1 21.30% 0.00% 25.00% 5 0 6 20 4 22 0 0 1 4.12% 0.00% 25.00% 1 0 6 60 4 22 0 0 0 0.00% 0.00% 0.00% 0 0 0 100 4 22 0 0 0 0.00% 0.00% 0.00% 0 0 0 200 4 22 0 0 0 0.00% 0.00% 0.00% 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 1 0 3 29.17% 0.00% 75.00% 7 0 17 2 4 25 0 0 1 2.48% 0.00% 25.00% 1 0 8 6 4 25 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 4 25 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 4 25 0 0 0 0.00% 0.00% 0.00% 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 1 100.00% 100.00% 100.00% 1 1 1 2 1 1 0 0 1 44.01% 0.00% 100.00% 0 0 1 6 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 1 0 0 0 0.00% 0.00% 0.00% 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 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 49 of 58 December 2016 ------- G.6-OT Only Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound Lower Bound Upper Bound ALL SYSTEMS 927,057 1,746,427 210,322 52,642 450,046 34.36% 21.04% 56.93% 600,093 367,398 994,199 927,057 1,746,427 42,597 21,805 83,552 18.59% 15.77% 26.67% 324,644 275,483 465,808 927,057 1,746,427 18,498 10,903 21,805 13.38% 7.89% 15.77% 233,696 137,741 275,483 927,057 1,746,427 10,964 0 21,805 7.93% 0.00% 15.77% 138,515 0 275,483 927,057 1,746,427 1,797 0 10,903 1.30% 0.00% 7.89% 22,699 0 137,741 927,057 1,746,427 0 0 0 0.00% 0.00% 0.00% 0 0 0 927,057 1,746,427 0 0 0 0.00% 0.00% 0.00% 0 0 0 927,057 1,746,427 0 0 0 0.00% 0.00% 0.00% 0 0 0 927,057 1,746,427 0 0 0 0.00% 0.00% 0.00% 0 0 0 477,672 876,128 133,646 27,055 255,009 27.98% 5.66% 53.39% 462,746 341,811 653,464 477,672 876,128 27,941 21,805 27,055 5.85% 4.56% 5.66% 304,728 275,483 341,811 477,672 876,128 18,498 10,903 21,805 3.87% 2.28% 4.56% 233,696 137,741 275,483 477,672 876,128 10,964 0 21,805 2.30% 0.00% 4.56% 138,515 0 275,483 477,672 876,128 1,797 0 10,903 0.38% 0.00% 2.28% 22,699 0 137,741 477,672 876,128 0 0 0 0.00% 0.00% 0.00% 0 0 0 477,672 876,128 0 0 0 0.00% 0.00% 0.00% 0 0 0 477,672 876,128 0 0 0 0.00% 0.00% 0.00% 0 0 0 477,672 876,128 0 0 0 0.00% 0.00% 0.00% 0 0 0 347,039 767,954 46,058 0 143,864 13.27% 0.00% 41.45% 106,730 0 289,562 347,039 767,954 3,348 0 30,911 0.96% 0.00% 8.91% 8,608 0 98,410 347,039 767,954 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 0 347,039 767,954 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 30,618 25,587 51,173 29.92% 25.00% 50.00% 30,618 25,587 51,173 102,346 102,346 11,308 0 25,587 11.05% 0.00% 25.00% 11,308 0 25,587 102,346 102,346 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 0 102,346 102,346 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 0 102,346 102,346 0 0 0 0.00% 0.00% 0.00% 0 0 0 Appendix G Six-Year Review 3 Technical Support Document for Nitrosamines Page 50 of 58 December 2016 ------- G.7 - ND Only Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Systems Number of UCMR 2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA 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 6 2 12 9.94% 3.90% 17.90% 817 321 1,472 2 55 8,222 1 0 2 2.20% 0.00% 3.90% 181 0 321 6 55 8,222 0 0 0 0.07% 0.00% 0.00% 5 0 0 10 55 8,222 0 0 0 0.01% 0.00% 0.00% 1 0 0 20 55 8,222 0 0 0 0.00% 0.00% 0.00% 0 0 0 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 1 0 3 35.63% 0.00% 75.00% 13 0 27 2 4 36 0 0 0 1.26% 0.00% 0.00% 0 0 0 6 4 36 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 4 36 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 4 36 0 0 0 0.00% 0.00% 0.00% 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 5 2 9 9.83% 3.92% 17.65% 804 321 1,445 2 51 8,187 1 0 2 2.20% 0.00% 3.92% 180 0 321 6 51 8,187 0 0 0 0.07% 0.00% 0.00% 5 0 0 10 51 8,187 0 0 0 0.01% 0.00% 0.00% 1 0 0 20 51 8,187 0 0 0 0.00% 0.00% 0.00% 0 0 0 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 51 of 58 December 2016 ------- G.7 - ND Only Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound Lower Bound Upper Bound SMALL SYSTEMS (Serving < 10,000) 42,570 6,985,901 4,719 1,724 8,970 11.01% 4.08% 20.83% 769,438 285,282 1,455,371 42,570 6,985,901 951 0 2,800 2.25% 0.00% 6.63% 156,839 0 463,269 42,570 6,985,901 21 0 0 0.05% 0.00% 0.00% 3,401 0 0 42,570 6,985,901 1 0 0 0.00% 0.00% 0.00% 190 0 0 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 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 42,570 6,985,901 0 0 0 0.00% 0.00% 0.00% 0 0 0 895 90,645 176 0 448 19.66% 0.00% 50.00% 17,819 0 45,323 895 90,645 7 0 0 0.74% 0.00% 0.00% 670 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 0 895 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 4,543 1,724 8,522 10.90% 4.14% 20.45% 751,618 285,282 1,410,049 41,675 6,895,255 944 0 2,800 2.26% 0.00% 6.72% 156,169 0 463,269 41,675 6,895,255 21 0 0 0.05% 0.00% 0.00% 3,401 0 0 41,675 6,895,255 1 0 0 0.00% 0.00% 0.00% 190 0 0 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 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 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 52 of 58 December 2016 ------- G.7 - ND Only Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Systems Number of UCMR 2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA 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 0 0 1 10.55% 0.00% 33.33% 3 0 8 2 3 24 0 0 0 0.37% 0.00% 0.00% 0 0 0 6 3 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 3 24 0 0 0 0.00% 0.00% 0.00% 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 0 0 1 10.55% 0.00% 33.33% 3 0 8 2 3 24 0 0 0 0.37% 0.00% 0.00% 0 0 0 6 3 24 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 3 24 0 0 0 0.00% 0.00% 0.00% 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 53 of 58 December 2016 ------- G.7 - ND Only Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound Lower Bound Upper Bound LARGE SYSTEMS (Serving 10,001 -100,000) 167,731 613,666 2,506 0 15,503 1.49% 0.00% 9.24% 9,168 0 56,720 167,731 613,666 32 0 0 0.02% 0.00% 0.00% 119 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 0 167,731 613,666 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 2,506 0 15,503 1.49% 0.00% 9.24% 9,168 0 56,720 167,731 613,666 32 0 0 0.02% 0.00% 0.00% 119 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 0 167,731 613,666 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 54 of 58 December 2016 ------- G.7 - ND Only Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Systems Number of UCMR 2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA 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 6.37% 0.00% 100.00% 0 0 1 2 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 1 0 0 0 0.00% 0.00% 0.00% 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 6.37% 0.00% 100.00% 0 0 1 2 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 6 1 1 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 1 1 0 0 0 0.00% 0.00% 0.00% 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 55 of 58 December 2016 ------- G.7 - ND Only Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound Lower Bound Upper Bound VERY LARGE SYSTEMS (Serving > 100,000) 107,323 107,323 2,130 0 21,465 1.99% 0.00% 20.00% 2,130 0 21,465 107,323 107,323 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 0 107,323 107,323 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 2,130 0 21,465 1.99% 0.00% 20.00% 2,130 0 21,465 107,323 107,323 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 0 107,323 107,323 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 56 of 58 December 2016 ------- G.7 - ND Only Source Water Type Threshold (ng/L) Total Number of UCMR2 Systems National Number of Systems Number of UCMR 2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Number of UCMR2 Systems with Predicted LRAA Exceeding Threshold Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percentage of Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Number of Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Number of Systems with LRAA 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 7 2 14 9.94% 3.89% 17.95% 820 321 1,480 2 59 8,247 1 0 2 2.19% 0.00% 3.89% 181 0 321 6 59 8,247 0 0 0 0.07% 0.00% 0.00% 5 0 0 10 59 8,247 0 0 0 0.01% 0.00% 0.00% 1 0 0 20 59 8,247 0 0 0 0.00% 0.00% 0.00% 0 0 0 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 1 0 3 35.63% 0.00% 75.00% 13 0 27 2 4 36 0 0 0 1.26% 0.00% 0.00% 0 0 0 6 4 36 0 0 0 0.00% 0.00% 0.00% 0 0 0 10 4 36 0 0 0 0.00% 0.00% 0.00% 0 0 0 20 4 36 0 0 0 0.00% 0.00% 0.00% 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 5 2 11 9.80% 3.64% 20.00% 807 321 1,454 2 55 8,211 1 0 2 2.06% 0.00% 3.64% 180 0 321 6 55 8,211 0 0 0 0.06% 0.00% 0.00% 5 0 0 10 55 8,211 0 0 0 0.01% 0.00% 0.00% 1 0 0 20 55 8,211 0 0 0 0.00% 0.00% 0.00% 0 0 0 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 57 of 58 December 2016 ------- G.7 - ND Only Total Population Served by UCMR2 Systems National Population Served by Systems Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold 90% CI on Population Served by UCMR2 Systems with Predicted LRAA Exceeding Threshold Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation 90% CI on Percent of Population Served by Systems with Predicted LRAA Exceeding Threshold - National Extrapolation Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation 90% CI on Total Pop. Served by Systems with LRAA Exceeding Threshold - National Extrapolation Lower Bound Upper Bound Lower Bound Upper Bound Lower Bound Upper Bound ALL SYSTEMS 317,624 7,706,889 9,355 1,724 45,938 10.13% 3.70% 19.90% 780,736 285,282 1,533,556 317,624 7,706,889 983 0 2,800 2.04% 0.00% 6.01% 156,957 0 463,269 317,624 7,706,889 21 0 0 0.04% 0.00% 0.00% 3,401 0 0 317,624 7,706,889 1 0 0 0.00% 0.00% 0.00% 190 0 0 317,624 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 0 317,624 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 0 317,624 7,706,889 0 0 0 0.00% 0.00% 0.00% 0 0 0 895 90,645 176 0 448 19.66% 0.00% 50.00% 17,819 0 45,323 895 90,645 7 0 0 0.74% 0.00% 0.00% 670 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 0 895 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 9,179 1,724 45,490 2.90% 0.54% 14.36% 762,916 285,282 1,488,234 316,729 7,616,244 976 0 2,800 0.31% 0.00% 0.88% 156,288 0 463,269 316,729 7,616,244 21 0 0 0.01% 0.00% 0.00% 3,401 0 0 316,729 7,616,244 1 0 0 0.00% 0.00% 0.00% 190 0 0 316,729 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 0 316,729 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 0 316,729 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 G Six-Year Review 3 Technical Support Document for Nitrosamines Page 58 of 58 December 2016 ------- |