What specific PFAS chemicals does the EPA propose to remove drinking-water limits for?

The EPA proposes to rescind national drinking-water limits for perfluorohexane sulfonic acid (PFHxS), perfluorononanoic acid (PFNA), hexafluoropropylene oxide dimer acid (HFPO-DA, known as GenX), and perfluorobutane sulfonic acid (PFBS).

What are the two main regulatory actions announced by the EPA in this proposal?

The EPA announced two proposals: first, to rescind its 2024 decision to regulate four PFAS chemicals (PFHxS, PFNA, HFPO-DA/GenX, and PFBS) by repealing their national drinking-water limits; and second, to extend the compliance deadline for drinking-water systems to meet existing limits for two other PFAS chemicals.

EPA proposes rescinding drinking-water limits for 4 PFAS

May 19, 2026

The US EPA proposed repealing national drinking-water limits for four PFAS chemicals, including GenX, reversing a 2024 regulatory decision. Compliance deadlines for two other PFAS will also be extended under the new proposal.

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