Federal Register #EPAHQ-OW-2025-0654

EPA Proposed Rule: Rescission of Regulatory Determinations for Four PFAS Substances under SDWA

The U.S. Environmental Protection Agency (EPA) is proposing to rescind regulatory determinations and related provisions for four PFAS substances under the Safe Drinking Water Act (SDWA): - Affected Substances: - Perfluorohexane sulfonic acid (PFHxS) - Perfluorononanoic acid (PFNA) - Hexafluoropropylene oxide dimer acid (HFPO-DA, also known as GenX chemicals) - Mixtures of PFHxS, PFNA, HFPO-DA, and perfluorobutane sulfonic acid (PFBS) - Key Actions: - Removal of Maximum Contaminant Levels (MCLs) and monitoring requirements for these PFAS from the 2024 PFAS National Primary Drinking Water Regulations - Retention of regulations for other PFAS, specifically PFOA and PFOS - Action taken to correct procedural legal errors in the original rulemaking process - Impacted Entities: - Community and non-transient non-community public water systems - No OEMs or vendors are named, as this is a regulatory action, not a procurement - EPA is seeking public comment and will hold a virtual hearing - No procurement of products or services is involved

Description

The Environmental Protection Agency (EPA) is proposing to rescind its regulatory determinations to regulate four per- and polyfluoroalkyl substances (PFAS)—PFHxS, PFNA, HFPO-DA (GenX), and mixtures of these three plus PFBS—under the Safe Drinking Water Act. The EPA also proposes to rescind all associated regulatory provisions in the 2024 PFAS National Primary Drinking Water Regulations (NPDWR) related to these substances, including Maximum Contaminant Levels (MCLs) that would have required monitoring and treatment by public water systems. This action corrects an unlawful procedure under which these regulations were promulgated, as the EPA previously issued regulatory determinations and regulations simultaneously, which is not authorized by statute. The EPA is seeking public comment on this proposal.

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