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Code of Federal Regulations (Last Updated: November 8, 2024) |
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Title 40 - Protection of Environment |
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Chapter I - Environmental Protection Agency |
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SubChapter D - Water Programs |
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Part 141 - National Primary Drinking Water Regulations |
| Subpart A - General |
| § 141.1 - Applicability. |
| § 141.2 - Definitions. |
| § 141.3 - Coverage. |
| § 141.4 - Variances and exemptions. |
| § 141.5 - Siting requirements. |
| § 141.6 - Effective dates. |
| Subpart B - Maximum Contaminant Levels |
| § 141.11 - Maximum contaminant levels for inorganic chemicals. |
| § 141.12 - [Reserved] |
| § 141.13 - Maximum contaminant levels for turbidity. |
| § 141.15 - Maximum contaminant levels for radium-226, radium-228, and gross alpha particle radioactivity in community water systems. |
| § 141.16 - Maximum contaminant levels for beta particle and photon radioactivity from man-made radionuclides in community water systems. |
| Subpart C - Monitoring and Analytical Requirements |
| § 141.21 - Coliform sampling. |
| § 141.22 - Turbidity sampling and analytical requirements. |
| § 141.23 - Inorganic chemical sampling and analytical requirements. |
| § 141.24 - Organic chemicals, sampling and analytical requirements. |
| § 141.25 - Analytical methods for radioactivity. |
| § 141.26 - Monitoring frequency and compliance requirements for radionuclides in community water systems. |
| § 141.27 - Alternate analytical techniques. |
| § 141.28 - Certified laboratories. |
| § 141.29 - Monitoring of consecutive public water systems. |
| § 141.30 - Total trihalomethanes sampling, analytical and other requirements. |
| Appendix A to Subpart C of Part 141 - —Alternative Testing Methods Approved for Analyses Under the Safe Drinking Water Act |
| Subpart D - Reporting and Recordkeeping |
| § 141.31 - Reporting requirements. |
| § 141.32 - [Reserved] |
| § 141.33 - Record maintenance. |
| § 141.34 - [Reserved] |
| § 141.35 - Reporting for unregulated contaminant monitoring results. |
| Subpart E - Special Regulations, Including Monitoring Regulations and Prohibition on Lead Use |
| § 141.40 - Monitoring requirements for unregulated contaminants. |
| § 141.41 - Special monitoring for sodium. |
| § 141.42 - Special monitoring for corrosivity characteristics. |
| § 141.43 - Prohibition on use of lead pipes, solder, and flux. |
| Appendix A to § 141.40 - Quality Control Requirements for Testing All Samples Collected |
| Subpart F - Maximum Contaminant Level Goals and Maximum Residual Disinfectant Level Goals |
| § 141.50 - Maximum contaminant level goals for organic contaminants. |
| § 141.51 - Maximum contaminant level goals for inorganic contaminants. |
| § 141.52 - Maximum contaminant level goals for microbiological contaminants. |
| § 141.53 - Maximum contaminant level goals for disinfection byproducts. |
| § 141.54 - Maximum residual disinfectant level goals for disinfectants. |
| § 141.55 - Maximum contaminant level goals for radionuclides. |
| Subpart G - National Primary Drinking Water Regulations: Maximum Contaminant Levels and Maximum Residual Disinfectant Levels |
| § 141.60 - Effective dates. |
| § 141.61 - Maximum contaminant levels for organic contaminants. |
| § 141.62 - Maximum contaminant levels for inorganic contaminants. |
| § 141.63 - Maximum contaminant levels (MCLs) for microbiological contaminants. |
| § 141.64 - Maximum contaminant levels for disinfection byproducts. |
| § 141.65 - Maximum residual disinfectant levels. |
| § 141.66 - Maximum contaminant levels for radionuclides. |
| Subpart H - Filtration and Disinfection |
| § 141.70 - General requirements. |
| § 141.71 - Criteria for avoiding filtration. |
| § 141.72 - Disinfection. |
| § 141.73 - Filtration. |
| § 141.74 - Analytical and monitoring requirements. |
| § 141.75 - Reporting and recordkeeping requirements. |
| § 141.76 - Recycle provisions. |
| Subpart I - Control of Lead and Copper |
| § 141.80 - General requirements. |
| § 141.81 - Applicability of corrosion control treatment steps to small, medium, and large water systems. |
| § 141.82 - Description of corrosion control treatment requirements. |
| § 141.83 - Source water treatment requirements. |
| § 141.84 - Lead service line replacement requirements. |
| § 141.85 - Public education and supplemental monitoring and mitigation requirements. |
| § 141.86 - Monitoring requirements for lead and copper in tap water. |
| § 141.87 - Monitoring requirements for water quality parameters. |
| § 141.88 - Monitoring requirements for lead and copper in source water. |
| § 141.89 - Analytical methods. |
| § 141.90 - Reporting requirements. |
| § 141.91 - Recordkeeping requirements. |
| § 141.92 - Monitoring for lead in schools and child care facilities. |
| § 141.93 - Small water system compliance flexibility. |
| Subpart J - Use of Non-Centralized Treatment Devices |
| § 141.100 - Criteria and procedures for public water systems using point-of-entry devices. |
| § 141.101 - Use of bottled water. |
| Subpart K - Treatment Techniques |
| § 141.110 - General requirements. |
| § 141.111 - Treatment techniques for acrylamide and epichlorohydrin. |
| Subpart L - Disinfectant Residuals, Disinfection Byproducts, and Disinfection Byproduct Precursors |
| § 141.130 - General requirements. |
| § 141.131 - Analytical requirements. |
| § 141.132 - Monitoring requirements. |
| § 141.133 - Compliance requirements. |
| § 141.134 - Reporting and recordkeeping requirements. |
| § 141.135 - Treatment technique for control of disinfection byproduct (DBP) precursors. |
| Subpart M - Information Collection Requriements (ICR) for Public Water Systems |
| § 141.140 - Definitions specific to subpart M. |
| § 141.141 - General requirements, applicability, and schedule for information collection. |
| § 141.142 - Disinfection byproduct and related monitoring. |
| § 141.143 - Microbial monitoring. |
| § 141.144 - Disinfection byproduct precursor removal studies. |
| Appendix A to 40 CFR 141.141(a) |
| Subparts M--N - XXX |
| Subpart O - Consumer Confidence Reports |
| § 141.151 - Purpose and applicability of this subpart. |
| § 141.152 - Compliance dates. |
| § 141.153 - Content of the reports. |
| § 141.154 - Required additional health information. |
| § 141.155 - Report delivery, reporting, and recordkeeping. |
| § 141.156 - Summary of report contents. |
| Appendix A to Subpart O of Part 141 - —Regulated Contaminants |
| Subpart P - Enhanced Filtration and Disinfection - Systems Serving 10,000 or More People |
| § 141.170 - General requirements. |
| § 141.171 - Criteria for avoiding filtration. |
| § 141.172 - Disinfection profiling and benchmarking. |
| § 141.173 - Filtration. |
| § 141.174 - Filtration sampling requirements. |
| § 141.175 - Reporting and recordkeeping requirements. |
| Subpart Q - Public Notification of Drinking Water Violations |
| § 141.201 - General public notification requirements. |
| § 141.202 - Tier 1 Public Notice—Form, manner, and frequency of notice. |
| § 141.203 - Tier 2 Public Notice - Form, manner, and frequency of notice. |
| § 141.204 - Tier 3 Public Notice - Form, manner, and frequency of notice. |
| § 141.205 - Content of the public notice. |
| § 141.206 - Notice to new billing units or new customers. |
| § 141.207 - Special notice of the availability of unregulated contaminant monitoring results. |
| § 141.208 - Special notice for exceedance of the SMCL for fluoride. |
| § 141.209 - Special notice for nitrate exceedances above MCL by non-community water systems (NCWS), where granted permission by the primacy agency under § 141.11(d). |
| § 141.210 - Notice by primacy agency on behalf of the public water system. |
| § 141.211 - Special notice for repeated failure to conduct monitoring of the source water for Cryptosporidium and for failure to determine bin classification or mean Cryptosporidium level. |
| Appendix A to Subpart Q of Part 141 - —NPDWR Violations and Other Situations Requiring Public Notice 1 |
| Appendix B to Subpart Q of Part 141 - —Standard Health Effects Language for Public Notification |
| Appendix C to Subpart Q of Part 141 - —List of Acronyms Used in Public Notification Regulation |
| Subpart R - XXX |
| Subpart S - Ground Water Rule |
| § 141.400 - General requirements and applicability. |
| § 141.401 - Sanitary surveys for ground water systems. |
| § 141.402 - Ground water source microbial monitoring and analytical methods. |
| § 141.403 - Treatment technique requirements for ground water systems. |
| § 141.404 - Treatment technique violations for ground water systems. |
| § 141.405 - Reporting and recordkeeping for ground water systems. |
| Subpart T - Enhanced Filtration and Disinfection - Systems Serving Fewer Than 10,000 People |
| Disinfection Profile |
| § 141.530 - What is a disinfection profile and who must develop one? |
| § 141.531 - What criteria must a State use to determine that a profile is unnecessary? |
| § 141.532 - How does my system develop a disinfection profile and when must it begin? |
| § 141.533 - What data must my system collect to calculate a disinfection profile? |
| § 141.534 - How does my system use this data to calculate an inactivation ratio? |
| § 141.535 - What if my system uses chloramines, ozone, or chlorine dioxide for primary disinfection? |
| § 141.536 - My system has developed an inactivation ratio; what must we do now? |
| General Requirements |
| § 141.500 - General requirements. |
| § 141.501 - Who is subject to the requirements of subpart T? |
| § 141.502 - When must my system comply with these requirements? |
| § 141.503 - What does subpart T require? |
| Finished Water Reservoirs |
| § 141.510 - Is my system subject to the new finished water reservoir requirements? |
| § 141.511 - What is required of new finished water reservoirs? |
| Reporting and Recordkeeping Requirements |
| § 141.570 - What does subpart T require that my system report to the State? |
| § 141.571 - What records does subpart T require my system to keep? |
| Individual Filter Turbidity Requirements |
| § 141.560 - Is my system subject to individual filter turbidity requirements? |
| § 141.561 - What happens if my system's turbidity monitoring equipment fails? |
| § 141.562 - My system only has two or fewer filters - is there any special provision regarding individual filter turbidity monitoring? |
| § 141.563 - What follow-up action is my system required to take based on continuous turbidity monitoring? |
| § 141.564 - My system practices lime softening - is there any special provision regarding my individual filter turbidity monitoring? |
| Additional Watershed Control Requirements for Unfiltered Systems |
| § 141.520 - Is my system subject to the updated watershed control requirements? |
| § 141.521 - What updated watershed control requirements must my unfiltered system implement to continue to avoid filtration? |
| § 141.522 - How does the State determine whether my system's watershed control requirements are adequate? |
| Combined Filter Effluent Requirements |
| § 141.550 - Is my system required to meet subpart T combined filter effluent turbidity limits? |
| § 141.551 - What strengthened combined filter effluent turbidity limits must my system meet? |
| § 141.552 - My system consists of “alternative filtration” and is required to conduct a demonstration - what is required of my system and how does the State establish my turbidity limits? |
| § 141.553 - My system practices lime softening - is there any special provision regarding my combined filter effluent? |
| Disinfection Benchmark |
| § 141.540 - Who has to develop a disinfection benchmark? |
| § 141.541 - What are significant changes to disinfection practice? |
| § 141.542 - What must my system do if we are considering a significant change to disinfection practices? |
| § 141.543 - How is the disinfection benchmark calculated? |
| § 141.544 - What if my system uses chloramines, ozone, or chlorine dioxide for primary disinfection? |
| Subpart U - Initial Distribution System Evaluations |
| § 141.600 - General requirements. |
| § 141.601 - Standard monitoring. |
| § 141.602 - System specific studies. |
| § 141.603 - 40/30 certification. |
| § 141.604 - Very small system waivers. |
| § 141.605 - Subpart V compliance monitoring location recommendations. |
| Subpart V - Stage 2 Disinfection Byproducts Requirements |
| § 141.620 - General requirements. |
| § 141.621 - Routine monitoring. |
| § 141.622 - Subpart V monitoring plan. |
| § 141.623 - Reduced monitoring. |
| § 141.624 - Additional requirements for consecutive systems. |
| § 141.625 - Conditions requiring increased monitoring. |
| § 141.626 - Operational evaluation levels. |
| § 141.627 - Requirements for remaining on reduced TTHM and HAA5 monitoring based on subpart L results. |
| § 141.628 - Requirements for remaining on increased TTHM and HAA5 monitoring based on subpart L results. |
| § 141.629 - Reporting and recordkeeping requirements. |
| Subpart W - Enhanced Treatment for Cryptosporidium |
| Source Water Monitoring Requirements |
| § 141.701 - Source water monitoring. |
| § 141.702 - Sampling schedules. |
| § 141.703 - Sampling locations. |
| § 141.704 - Analytical methods. |
| § 141.705 - Approved laboratories. |
| § 141.706 - Reporting source water monitoring results. |
| § 141.707 - Grandfathering previously collected data. |
| Requirements for Microbial Toolbox Components |
| § 141.715 - Microbial toolbox options for meeting Cryptosporidium treatment requirements. |
| § 141.716 - Source toolbox components. |
| § 141.717 - Pre-filtration treatment toolbox components. |
| § 141.718 - Treatment performance toolbox components. |
| § 141.719 - Additional filtration toolbox components. |
| § 141.720 - Inactivation toolbox components. |
| Disinfection Profiling and Benchmarking Requirements |
| § 141.708 - Requirements when making a significant change in disinfection practice. |
| § 141.709 - Developing the disinfection profile and benchmark. |
| Reporting and Recordkeeping Requirements |
| § 141.721 - Reporting requirements. |
| § 141.722 - Recordkeeping requirements. |
| Requirements for Sanitary Surveys Performed by EPA |
| § 141.723 - Requirements to respond to significant deficiencies identified in sanitary surveys performed by EPA. |
| General Requirements |
| § 141.700 - General requirements. |
| Treatment Technique Requirements |
| § 141.710 - Bin classification for filtered systems. |
| § 141.711 - Filtered system additional Cryptosporidium treatment requirements. |
| § 141.712 - Unfiltered system Cryptosporidium treatment requirements. |
| § 141.713 - Schedule for compliance with Cryptosporidium treatment requirements. |
| § 141.714 - Requirements for uncovered finished water storage facilities. |
| Subpart X - Aircraft Drinking Water Rule |
| § 141.800 - Applicability and compliance date. |
| § 141.801 - Definitions. |
| § 141.802 - Coliform sampling plan. |
| § 141.803 - Coliform sampling. |
| § 141.804 - Aircraft water system operations and maintenance plan. |
| § 141.805 - Notification to passengers and crew. |
| § 141.806 - Reporting requirements. |
| § 141.807 - Recordkeeping requirements. |
| § 141.808 - Audits and inspections. |
| § 141.809 - Supplemental treatment. |
| § 141.810 - Violations. |
| Subpart Y - Revised Total Coliform Rule |
| § 141.851 - General. |
| § 141.852 - Analytical methods and laboratory certification. |
| § 141.853 - General monitoring requirements for all public water systems. |
| § 141.854 - Routine monitoring requirements for non-community water systems serving 1,000 or fewer people using only ground water. |
| § 141.855 - Routine monitoring requirements for community water systems serving 1,000 or fewer people using only ground water. |
| § 141.856 - Routine monitoring requirements for subpart H public water systems serving 1,000 or fewer people. |
| § 141.857 - Routine monitoring requirements for public water systems serving more than 1,000 people. |
| § 141.858 - Repeat monitoring and E. coli requirements. |
| § 141.859 - Coliform treatment technique triggers and assessment requirements for protection against potential fecal contamination. |
| § 141.860 - Violations. |
| § 141.861 - Reporting and recordkeeping. |
| §§ 141.851--141.861 - xxx |
| Subpart Z - Control of Per- and Polyfluoroalkyl Substances (PFAS) |
| § 141.900 - General requirements. |
| § 141.901 - Analytical requirements. |
| § 141.902 - Monitoring requirements. |
| § 141.903 - Compliance requirements. |
| § 141.904 - Reporting and recordkeeping requirements. |
| § 141.905 - Violations. |