40 CFR Part 141 - PART 141—NATIONAL PRIMARY DRINKING WATER REGULATIONS

  1. Subpart A—General (§§ 141.1 - 141.6)
  2. Subpart B—Maximum Contaminant Levels (§§ 141.11 - 141.13)
  3. Subpart C—Monitoring and Analytical Requirements (§§ 141.21 - 141.29)
  4. Subpart D—Reporting and Recordkeeping (§§ 141.31 - 141.35)
  5. Subpart E—Special Regulations, Including Monitoring (§§ 141.40 - 141.42)
  6. Subpart F—Maximum Contaminant Level Goals and Maximum Residual Disinfectant Level Goals (§§ 141.50 - 141.55)
  7. Subpart G—National Primary Drinking Water Regulations: Maximum Contaminant Levels and Maximum Residual Disinfectant Levels (§§ 141.60 - 141.66)
  8. Subpart H—Filtration and Disinfection (§§ 141.70 - 141.76)
  9. Subpart I—Control of Lead and Copper (§§ 141.80 - 141.93)
  10. Subpart J—Use of Non-Centralized Treatment Devices (§§ 141.100 - 141.101)
  11. Subpart K—Treatment Techniques (§§ 141.110 - 141.111)
  12. Subpart L—Disinfectant Residuals, Disinfection Byproducts, and Disinfection Byproduct Precursors (§§ 141.130 - 141.135)
  13. Subparts M–N [Reserved]
  14. Subpart O—Consumer Confidence Reports (§§ 141.151 - 141.155)
  15. Subpart P—Enhanced Filtration and Disinfection—Systems Serving 10,000 or More People (§§ 141.170 - 141.175)
  16. Subpart Q—Public Notification of Drinking Water Violations (§§ 141.201 - 141.211)
  17. Subpart R [Reserved]
  18. Subpart S—Ground Water Rule (§§ 141.400 - 141.405)
  19. Subpart T—Enhanced Filtration and Disinfection—Systems Serving Fewer Than 10,000 People (§§ 141.500 - 141.571)
  20. Subpart U—Initial Distribution System Evaluations (§§ 141.600 - 141.605)
  21. Subpart V—Stage 2 Disinfection Byproducts Requirements (§§ 141.620 - 141.629)
  22. Subpart W—Enhanced Treatment for Cryptosporidium (§§ 141.700 - 141.723)
  23. Subpart X—Aircraft Drinking Water Rule (§§ 141.800 - 141.810)
  24. Subpart Y—Revised Total Coliform Rule (§§ 141.851 - 141.861)
Authority:
42 U.S.C. 300f, 300g–1, 300g–2, 300g–3, 300g–4, 300g–5, 300g–6, 300j–4, 300j–9, and 300j–11.
Source:
40 FR 59570, Dec. 24, 1975, unless otherwise noted.
Editorial Note:
Nomenclature changes to part 141 appear at 69 FR 18803, Apr. 9, 2004.
Note:

For community water systems serving 75,000 or more persons, monitoring must begin 1 year following promulation and the effective date of the MCL is 2 years following promulgation. For community water systems serving 10,000 to 75,000 persons, monitoring must begin within 3 years from the date of promulgation and the effective date of the MCL is 4 years from the date of promulgation. Effective immediately, systems that plan to make significant modifications to their treatment processes for the purpose of complying with the TTHM MCL are required to seek and obtain State approval of their treatment modification plans. This note affects §§ 141.2, 141.6, 141.12, 141.24 and 141.30. For additional information see 44 FR 68641, Nov. 29, 1979.

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