US EPA proposes rescinding SDWA/NPDWR provisions for PFHxS, PFNA, HFPO‑DA (GenX) and Hazard Index mixtures (incl. PFBS)

EPA issued a proposed rule under the Safe Drinking Water Act to rescind the 2024 PFAS NPDWR regulatory determinations and remove associated provisions (including MCLGs/MCLs and related monitoring/treatment requirements) for PFHxS, PFNA, HFPO‑DA (GenX), and Hazard Index mixtures (PFHxS + PFNA + HFPO‑DA + PFBS). EPA scheduled a virtual public hearing for July 7, 2026 with pre‑registration deadline July 1, 2026, and indicated a 60‑day comment period following Federal Register publication. Drinking water compliance programs should track whether these four PFAS components remain regulated under the NPDWR and adjust monitoring, treatment planning, and compliance budgeting accordingly.