40 CFR Part 141
PART 141—NATIONAL PRIMARY DRINKING WATER REGULATIONS
- PART 141—NATIONAL PRIMARY DRINKING WATER REGULATIONS
- Chapter I—Environmental Protection Agency › Subchapter D—Water Programs
- 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.
- 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.
- 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
- § 141.40 Monitoring requirements for unregulated contaminants.
- § 141.41 Special monitoring for sodium.
- § 141.42 Special monitoring for corrosivity characteristics.
- 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 and action level.
- § 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 Service line inventory and 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.
- Subparts M-N [Reserved]
- 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 [Reserved]
- 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
- 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?
- 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?
- 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?
- 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?
- 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?
- 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?
- 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?
- 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
- General Requirements
- § 141.700 General requirements.
- 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.
- Disinfection Profiling and Benchmarking Requirements
- § 141.708 Requirements when making a significant change in disinfection practice.
- § 141.709 Developing the disinfection profile and benchmark.
- 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.
- 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.
- 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.
- 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.
- 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.
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