The EPA proposed rescinding drinking-water determinations and related provisions for PFHxS, PFNA, HFPO-DA and PFBS mixtures, while separately moving to extend compliance deadlines for PFOA and PFOS.
The Environmental Protection Agency on May 18 proposed rescinding drinking-water regulatory determinations and related provisions for four PFAS chemicals: PFHxS, PFNA, HFPO-DA, also known as GenX, and PFBS mixtures.
The agency said the move is part of a broader PFAS strategy and is intended to correct procedural problems it says affected the Biden-era rulemaking. EPA is opening the proposal to public comment for 60 days.
The proposal does not remove all federal PFAS drinking-water protections. EPA is separately proposing to keep limits in place for PFOA and PFOS while extending the compliance timeline for those standards.
EPA first finalized national PFAS drinking-water standards in April 2024. In May 2025, the agency said it intended to revisit the four-chemical portion of the rule.
The proposal sets up the latest phase of a broader fight over how aggressively the federal government should regulate so-called forever chemicals in drinking water. The action is expected to draw strong reactions from both public-health advocates and industry groups as the comment period proceeds.
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