Data / Federal rules / 2024-07773
PFAS National Primary Drinking Water Regulation
The Environmental Protection Agency published this final rule in the Federal Register on April 26, 2024. It took effect on June 25, 2024.
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What the agency says
In March 2023, the U.S. Environmental Protection Agency (EPA) proposed and requested comment on the National Primary Drinking Water Regulation (NPDWR) and health-based Maximum Contaminant Level Goals (MCLGs) for six per- and polyfluoroalkyl substances (PFAS): perfluorooctanoic acid (PFOA), perfluorooctane sulfonic acid (PFOS), perfluorohexane sulfonic acid (PFHxS), perfluorononanoic acid (PFNA), hexafluoropropylene oxide dimer acid (HFPO-DA, commonly known as GenX Chemicals), and perfluorobutane sulfonic acid (PFBS). After consideration of public comment and consistent with the provisions set forth under the Safe Drinking Water Act (SDWA), the EPA is finalizing NPDWRs for these six PFAS. Through this action, the EPA is finalizing MCLGs for PFOA and PFOS at zero. Considering feasibility, the EPA is promulgating individual Maximum Contaminant Levels (MCLs) for PFOA and PFOS at 4.0 nanograms per liter (ng/L) or parts per trillion (ppt). The EPA is also finalizing individual MCLGs and is promulgating individual MCLs for PFHxS, PFNA, and HFPO-DA at 10 ng/L. In addition to the individual MCLs for PFHxS, PFNA, and HFPO-DA, in consideration of the known toxic effects, dose additive health concerns and occurrence and likely co-occurrence in drinking water of these three PFAS, as well as PFBS, the EPA is finalizing a Hazard Index (HI) of 1 (unitless) as the MCLG and MCL for any mixture containing two or more of PFHxS, PFNA, HFPO-DA, and PFBS. Once fully implemented, the EPA estimates that the rule will prevent thousands of deaths and reduce tens of thousands of serious PFAS-attributable illnesses.
Key facts
- Document number
- 2024-07773
- Type
- Final rule
- Action
- Final rule
- Agency
- Environmental Protection Agency
- Published
- April 26, 2024
- Takes effect
- June 25, 2024
- Dates
- This final rule is effective on June 25, 2024. The incorporation by reference of certain publications listed in the rule is approved by the Director of the Federal Register as of June 25, 2024.
- Docket
- EPA-HQ-OW-2022-0114; FRL 8543-02-OW
- Regulation ID (RIN)
- 2040-AG18
- Code of Federal Regulations
- 40 CFR 141; 40 CFR 142
- Topics
- Administrative practice and procedure; Environmental protection; Incorporation by reference; Indians-lands; Intergovernmental relations; Reporting and recordkeeping requirements; Water supply
- Pages
- 226
Other documents from the Environmental Protection Agency
Everything from the Environmental Protection Agency · Rules on administrative practice and procedure · Rules on environmental protection · Rules on incorporation by reference · Published in April 2024
Read from the Federal Register API, last updated 2026-10-24. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.