Data / Federal rules / 2026-10085
Rescission of Regulatory Determinations and Removal of Related Provisions for Four PFAS Substances (PFHxS, PFNA, HFPO-DA (GenX), and the Mixture of These Three PFAS Plus PFBS)
The Environmental Protection Agency published this proposed rule in the Federal Register on May 20, 2026. Comments closed on July 20, 2026.
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What the agency says
The Environmental Protection Agency (EPA) is proposing to rescind its regulatory determinations to regulate four per- and polyfluoroalkyl substances (PFAS)--perfluorohexane sulfonic acid (PFHxS), perfluorononanoic acid (PFNA), hexafluoropropylene oxide dimer acid and its ammonium salt (HFPO-DA, commonly known as GenX chemicals), and mixtures of these three PFAS plus perfluorobutane sulfonic acid (PFBS)--under the Safe Drinking Water Act (SDWA). The EPA is also proposing to rescind all associated regulatory provisions currently codified in the EPA's 2024 PFAS National Primary Drinking Water Regulations (NPDWR) exclusive to these PFAS that were promulgated pursuant to the regulatory determinations that the EPA is now proposing to rescind, including the final Maximum Contaminant Levels (MCLs) that would have required monitoring, and where necessary, treatment by public water systems (PWSs). This proposed action is necessary to correct the unlawful procedure under which these regulations were promulgated. Under the EPA's prior interpretation, the EPA proposed and finalized regulatory determinations and regulations for these PFAS simultaneously and in tandem. Under the best reading of the statute, the EPA is not authorized to take such actions simultaneously and therefore, the Agency proposes to rescind those regulatory determinations, Maximum Contaminant Level Goals (MCLGs) and associated portions of the 2024 PFAS NPDWR. The EPA is seeking public comment on this proposal.
Key facts
- Document number
- 2026-10085
- Type
- Proposed rule
- Action
- Notice of proposed rule; request for public comment; notice of public hearing
- Agency
- Environmental Protection Agency
- Published
- May 20, 2026
- Comments due
- July 20, 2026
- Dates
- Comments must be received on or before July 20, 2026.
- Docket
- EPA-HQ-OW-2025-0654; FRL 12843-01-OW
- Regulation ID (RIN)
- 2040-AG53
- Code of Federal Regulations
- 40 CFR 141; 40 CFR 142
- Topics
- Environmental protection; Reporting and recordkeeping requirements; Water supply
- Significant
- Yes, under Executive Order 12866
- Pages
- 13
Other documents from the Environmental Protection Agency
Everything from the Environmental Protection Agency · Rules on environmental protection · Rules on reporting and recordkeeping requirements · Rules on water supply · Published in May 2026
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