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FEDERAL · 40 CFR

Part 141 — National Primary Drinking Water Regulations

199 sections · Title 40: Protection of Environment

§ 141.1Applicability.
§ 141.2Definitions.
§ 141.3Coverage.
§ 141.4Variances and exemptions.
§ 141.5Siting requirements.
§ 141.6Effective dates.
§ 141.11Maximum contaminant levels for inorganic chemicals.
§ 141.12§ 141.12 [Reserved]
§ 141.13Maximum contaminant levels for turbidity.
§ 141.21Coliform sampling.
§ 141.22Turbidity sampling and analytical requirements.
§ 141.23Inorganic chemical sampling and analytical requirements.
§ 141.24Organic chemicals, sampling and analytical requirements.
§ 141.25Analytical methods for radioactivity.
§ 141.26Monitoring frequency and compliance requirements for radionuclides in community water systems.
§ 141.27Alternate analytical techniques.
§ 141.28Certified laboratories.
§ 141.29Monitoring of consecutive public water systems.
§ 141.31Reporting requirements.
§ 141.32§ 141.32 [Reserved]
§ 141.33Record maintenance.
§ 141.34§ 141.34 [Reserved]
§ 141.35Reporting for unregulated contaminant monitoring results.
§ 141.40Monitoring requirements for unregulated contaminants.
§ 141.41Special monitoring for sodium.
§ 141.42Special monitoring for corrosivity characteristics.
§ 141.50Maximum contaminant level goals for organic contaminants.
§ 141.51Maximum contaminant level goals for inorganic contaminants.
§ 141.52Maximum contaminant level goals for microbiological contaminants.
§ 141.53Maximum contaminant level goals for disinfection byproducts.
§ 141.54Maximum residual disinfectant level goals for disinfectants.
§ 141.55Maximum contaminant level goals for radionuclides.
§ 141.60Effective dates.
§ 141.61Maximum contaminant levels for organic contaminants.
§ 141.62Maximum contaminant levels for inorganic contaminants.
§ 141.63Maximum contaminant levels (MCLs) for microbiological contaminants.
§ 141.64Maximum contaminant levels for disinfection byproducts.
§ 141.65Maximum residual disinfectant levels.
§ 141.66Maximum contaminant levels for radionuclides.
§ 141.70General requirements.
§ 141.71Criteria for avoiding filtration.
§ 141.72Disinfection.
§ 141.73Filtration.
§ 141.74Analytical and monitoring requirements.
§ 141.75Reporting and recordkeeping requirements.
§ 141.76Recycle provisions.
§ 141.80General requirements and action level.
§ 141.81Applicability of corrosion control treatment steps to small, medium, and large water systems.
§ 141.82Description of corrosion control treatment requirements.
§ 141.83Source water treatment requirements.
§ 141.84Service line inventory and replacement requirements.
§ 141.85Public education and supplemental monitoring and mitigation requirements.
§ 141.86Monitoring requirements for lead and copper in tap water.
§ 141.87Monitoring requirements for water quality parameters.
§ 141.88Monitoring requirements for lead and copper in source water.
§ 141.89Analytical methods.
§ 141.90Reporting requirements.
§ 141.91Recordkeeping requirements.
§ 141.92Monitoring for lead in schools and child care facilities.
§ 141.93Small water system compliance flexibility.
§ 141.100Criteria and procedures for public water systems using point-of-entry devices.
§ 141.101Use of bottled water.
§ 141.110General requirements.
§ 141.111Treatment techniques for acrylamide and epichlorohydrin.
§ 141.130General requirements.
§ 141.131Analytical requirements.
§ 141.132Monitoring requirements.
§ 141.133Compliance requirements.
§ 141.134Reporting and recordkeeping requirements.
§ 141.135Treatment technique for control of disinfection byproduct (DBP) precursors.
§ 141.151Purpose and applicability of this subpart.
§ 141.152Compliance dates.
§ 141.153Content of the reports.
§ 141.154Required additional health information.
§ 141.155Report delivery, reporting, and recordkeeping.
§ 141.156Summary of report contents.
§ 141.170General requirements.
§ 141.171Criteria for avoiding filtration.
§ 141.172Disinfection profiling and benchmarking.
§ 141.173Filtration.
§ 141.174Filtration sampling requirements.
§ 141.175Reporting and recordkeeping requirements.
§ 141.201General public notification requirements.
§ 141.202<em>Tier 1 Public Notice</em>—Form, manner, and frequency of notice.
§ 141.203<em>Tier 2 Public Notice</em>—Form, manner, and frequency of notice.
§ 141.204<em>Tier 3 Public Notice</em>—Form, manner, and frequency of notice.
§ 141.205Content of the public notice.
§ 141.206Notice to new billing units or new customers.
§ 141.207Special notice of the availability of unregulated contaminant monitoring results.
§ 141.208Special notice for exceedance of the SMCL for fluoride.
§ 141.209Special notice for nitrate exceedances above MCL by non-community water systems (NCWS), where granted permission by the primacy agency under § 141.11(d).
§ 141.210Notice by primacy agency on behalf of the public water system.
§ 141.211Special notice for repeated failure to conduct monitoring of the source water for <em>Cryptosporidium</em> and for failure to determine bin classification or mean <em>Cryptosporidium</em> level.
§ 141.400General requirements and applicability.
§ 141.401Sanitary surveys for ground water systems.
§ 141.402Ground water source microbial monitoring and analytical methods.
§ 141.403Treatment technique requirements for ground water systems.
§ 141.404Treatment technique violations for ground water systems.
§ 141.405Reporting and recordkeeping for ground water systems.
§ 141.500General requirements.
§ 141.501Who is subject to the requirements of subpart T?
§ 141.502When must my system comply with these requirements?
§ 141.503What does subpart T require?
§ 141.510Is my system subject to the new finished water reservoir requirements?
§ 141.511What is required of new finished water reservoirs?
§ 141.520Is my system subject to the updated watershed control requirements?
§ 141.521What updated watershed control requirements must my unfiltered system implement to continue to avoid filtration?
§ 141.522How does the State determine whether my system's watershed control requirements are adequate?
§ 141.530What is a disinfection profile and who must develop one?
§ 141.531What criteria must a State use to determine that a profile is unnecessary?
§ 141.532How does my system develop a disinfection profile and when must it begin?
§ 141.533What data must my system collect to calculate a disinfection profile?
§ 141.534How does my system use this data to calculate an inactivation ratio?
§ 141.535What if my system uses chloramines, ozone, or chlorine dioxide for primary disinfection?
§ 141.536My system has developed an inactivation ratio; what must we do now?
§ 141.540Who has to develop a disinfection benchmark?
§ 141.541What are significant changes to disinfection practice?
§ 141.542What must my system do if we are considering a significant change to disinfection practices?
§ 141.543How is the disinfection benchmark calculated?
§ 141.544What if my system uses chloramines, ozone, or chlorine dioxide for primary disinfection?
§ 141.550Is my system required to meet subpart T combined filter effluent turbidity limits?
§ 141.551What strengthened combined filter effluent turbidity limits must my system meet?
§ 141.552My 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?
§ 141.553My system practices lime softening—is there any special provision regarding my combined filter effluent?
§ 141.560Is my system subject to individual filter turbidity requirements?
§ 141.561What happens if my system's turbidity monitoring equipment fails?
§ 141.562My system only has two or fewer filters—is there any special provision regarding individual filter turbidity monitoring?
§ 141.563What follow-up action is my system required to take based on continuous turbidity monitoring?
§ 141.564My system practices lime softening—is there any special provision regarding my individual filter turbidity monitoring?
§ 141.570What does subpart T require that my system report to the State?
§ 141.571What records does subpart T require my system to keep?
§ 141.600General requirements.
§ 141.601Standard monitoring.
§ 141.602System specific studies.
§ 141.60340/30 certification.
§ 141.604Very small system waivers.
§ 141.605Subpart V compliance monitoring location recommendations.
§ 141.620General requirements.
§ 141.621Routine monitoring.
§ 141.622Subpart V monitoring plan.
§ 141.623Reduced monitoring.
§ 141.624Additional requirements for consecutive systems.
§ 141.625Conditions requiring increased monitoring.
§ 141.626Operational evaluation levels.
§ 141.627Requirements for remaining on reduced TTHM and HAA5 monitoring based on subpart L results.
§ 141.628Requirements for remaining on increased TTHM and HAA5 monitoring based on subpart L results.
§ 141.629Reporting and recordkeeping requirements.
§ 141.700General requirements.
§ 141.701Source water monitoring.
§ 141.702Sampling schedules.
§ 141.703Sampling locations.
§ 141.704Analytical methods.
§ 141.705Approved laboratories.
§ 141.706Reporting source water monitoring results.
§ 141.707Grandfathering previously collected data.
§ 141.708Requirements when making a significant change in disinfection practice.
§ 141.709Developing the disinfection profile and benchmark.
§ 141.710Bin classification for filtered systems.
§ 141.711Filtered system additional <em>Cryptosporidium</em> treatment requirements.
§ 141.712Unfiltered system <em>Cryptosporidium</em> treatment requirements.
§ 141.713Schedule for compliance with <em>Cryptosporidium</em> treatment requirements.
§ 141.714Requirements for uncovered finished water storage facilities.
§ 141.715Microbial toolbox options for meeting <em>Cryptosporidium</em> treatment requirements.
§ 141.716Source toolbox components.
§ 141.717Pre-filtration treatment toolbox components.
§ 141.718Treatment performance toolbox components.
§ 141.719Additional filtration toolbox components.
§ 141.720Inactivation toolbox components.
§ 141.721Reporting requirements.
§ 141.722Recordkeeping requirements.
§ 141.723Requirements to respond to significant deficiencies identified in sanitary surveys performed by EPA.
§ 141.800Applicability and compliance date.
§ 141.801Definitions.
§ 141.802Coliform sampling plan.
§ 141.803Coliform sampling.
§ 141.804Aircraft water system operations and maintenance plan.
§ 141.805Notification to passengers and crew.
§ 141.806Reporting requirements.
§ 141.807Recordkeeping requirements.
§ 141.808Audits and inspections.
§ 141.809Supplemental treatment.
§ 141.810Violations.
§ 141.851General.
§ 141.852Analytical methods and laboratory certification.
§ 141.853General monitoring requirements for all public water systems.
§ 141.854Routine monitoring requirements for non-community water systems serving 1,000 or fewer people using only ground water.
§ 141.855Routine monitoring requirements for community water systems serving 1,000 or fewer people using only ground water.
§ 141.856Routine monitoring requirements for subpart H public water systems serving 1,000 or fewer people.
§ 141.857Routine monitoring requirements for public water systems serving more than 1,000 people.
§ 141.858Repeat monitoring and <em>E. coli</em> requirements.
§ 141.859Coliform treatment technique triggers and assessment requirements for protection against potential fecal contamination.
§ 141.860Violations.
§ 141.861Reporting and recordkeeping.
§ 141.900General requirements.
§ 141.901Analytical requirements.
§ 141.902Monitoring requirements.
§ 141.903Compliance requirements.
§ 141.904Reporting and recordkeeping requirements.
§ 141.905Violations.