Part 141 — National Primary Drinking Water Regulations
Subpart A — General
Subpart B — Maximum Contaminant Levels
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.
Subpart D — Reporting and Recordkeeping
Subpart E — Special Regulations, Including Monitoring
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
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
Subpart K — Treatment Techniques
Subpart L — Disinfectant Residuals, Disinfection Byproducts, and Disinfection Byproduct Precursors
Subpart O — Consumer Confidence Reports
Subpart P — Enhanced Filtration and Disinfection—Systems Serving 10,000 or More People
Subpart Q — Public Notification of Drinking Water Violations
- § 141.201— General 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.
- § 141.205— 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 <em>Cryptosporidium</em> and for failure to determine bin classification or mean <em>Cryptosporidium</em> level.
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
- § 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?
- § 141.510— Is my system subject to the new finished water reservoir requirements?
- § 141.511— What is required of new finished water reservoirs?
- § 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?
- § 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?
- § 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?
- § 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?
- § 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?
- § 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
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 <em>Cryptosporidium</em>
- § 141.700— General 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.
- § 141.708— Requirements when making a significant change in disinfection practice.
- § 141.709— Developing the disinfection profile and benchmark.
- § 141.710— Bin classification for filtered systems.
- § 141.711— Filtered system additional <em>Cryptosporidium</em> treatment requirements.
- § 141.712— Unfiltered system <em>Cryptosporidium</em> treatment requirements.
- § 141.713— Schedule for compliance with <em>Cryptosporidium</em> treatment requirements.
- § 141.714— Requirements for uncovered finished water storage facilities.
- § 141.715— Microbial toolbox options for meeting <em>Cryptosporidium</em> 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.
- § 141.721— Reporting requirements.
- § 141.722— Recordkeeping requirements.
- § 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 <em>E. coli</em> requirements.
- § 141.859— Coliform treatment technique triggers and assessment requirements for protection against potential fecal contamination.
- § 141.860— Violations.
- § 141.861— Reporting and recordkeeping.