Home
gpo.gov
govinfo.gov

e-CFR Navigation Aids

Browse

Simple Search

Advanced Search

 — Boolean

 — Proximity

 

Search History

Search Tips

Corrections

Latest Updates

User Info

FAQs

Agency List

Incorporation By Reference

eCFR logo

Related Resources

The Code of Federal Regulations (CFR) annual edition is the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government produced by the Office of the Federal Register (OFR) and the Government Publishing Office.

Download the Code of Federal Regulations in XML.

Download the Electronic Code of Federal Regulations in XML.

Monthly Title and Part user viewing data for the e-CFR is available for download in CSV format.

Parallel Table of Authorities and Rules for the Code of Federal Regulations and the United States Code
Text | PDF

Find, review, and submit comments on Federal rules that are open for comment and published in the Federal Register using Regulations.gov.

Purchase individual CFR titles from the U.S. Government Online Bookstore.

Find issues of the CFR (including issues prior to 1996) at a local Federal depository library.

[A2]

Electronic Code of Federal Regulations

We invite you to try out our new beta eCFR site at https://ecfr.federalregister.gov. We have made big changes to make the eCFR easier to use. Be sure to leave feedback using the Feedback button on the bottom right of each page!

e-CFR data is current as of January 21, 2021

Title 40 → Chapter I → Subchapter D → Part 141

TITLE 40—Protection of Environment

CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

SUBCHAPTER D—WATER PROGRAMS (CONTINUED)

PART 141—NATIONAL PRIMARY DRINKING WATER REGULATIONS

rule

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.
rule

Subpart B—MAXIMUM CONTAMINANT LEVELS

§141.11
Maximum contaminant levels for inorganic chemicals.
§141.12
[Reserved]
§141.13
Maximum contaminant levels for turbidity.
rule

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
Appendix A to Subpart C of Part 141—Alternative Testing Methods Approved for Analyses Under the Safe Drinking Water Act
rule

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.
rule

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.
rule

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.
rule

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.
rule

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.
rule

Subpart I—CONTROL OF LEAD AND COPPER

§141.80
General requirements.
§141.81
Applicability of corrosion control treatment steps to small, medium-size 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 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
xxx
§141.93
xxx
rule

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.
rule

Subpart K—TREATMENT TECHNIQUES

§141.110
General requirements.
§141.111
Treatment techniques for acrylamide and epichlorohydrin.
rule

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.
rule

Subparts M-N [Reserved]

rule

Subpart O—CONSUMER CONFIDENCE REPORTS

§141.151
Purpose and applicability of this subpart.
§141.152
Effective dates.
§141.153
Content of the reports.
§141.154
Required additional health information.
§141.155
Report delivery and recordkeeping.
Appendix
Appendix A to Subpart O of Part 141—Regulated Contaminants
rule

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.
rule

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
Appendix A to Subpart Q of Part 141—NPDWR Violations and Other Situations Requiring Public Notice
Appendix
Appendix B to Subpart Q of Part 141—Standard Health Effects Language for Public Notification
Appendix
Appendix C to Subpart Q of Part 141—List of Acronyms Used in Public Notification Regulation
rule

Subpart R—[RESERVED]

rule

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.
rule

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?
rule

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.
rule

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.
rule

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.
rule

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.
rule

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.

Need assistance?