EPA proposed rescinding 2024 NPDWR provisions for PFHxS, PFNA, HFPO‑DA (GenX) and Hazard Index mixtures (incl. PFBS)

EPA issued a proposed rule to rescind the SDWA regulatory determinations and remove associated 2024 PFAS NPDWR provisions covering PFHxS, PFNA, HFPO‑DA (GenX), and Hazard Index mixtures that include PFBS. The proposal initiates a public comment process (60 days after Federal Register publication per EPA materials) and includes a scheduled virtual public hearing on July 7, 2026 with preregistration by July 1, 2026. Compliance teams at public water systems and supporting consultants should track this rulemaking closely because, if finalized, it would roll back federal drinking-water standard provisions for these PFAS/mixture components, changing monitoring/treatment/planning assumptions under the 2024 NPDWR framework.