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

EPA announced a proposed rule to rescind regulatory determinations and remove related NPDWR provisions (including MCLGs/MCLs and associated requirements) for PFHxS, PFNA, HFPO‑DA (GenX), and the Hazard Index mixture approach (PFHxS/PFNA/HFPO‑DA plus PFBS). The proposal is open for public comment (60-day period following Federal Register publication) and includes a virtual public hearing scheduled for July 7, 2026 (registration deadline July 1, 2026). Compliance teams at public water systems and supporting vendors should track whether drinking-water obligations for these PFAS components are removed or modified, and consider participating in the comment/hearing process.