US EPA proposes rescinding parts of the 2024 PFAS NPDWR for PFHxS, PFNA, HFPO‑DA (GenX), and Hazard Index mixtures (incl. PFBS); hearing set for 7 July 2026

EPA announced a proposed Safe Drinking Water Act rulemaking to rescind regulatory determinations and associated regulatory provisions from the 2024 PFAS National Primary Drinking Water Regulation (NPDWR) as they apply to PFHxS, PFNA, HFPO‑DA (GenX), and Hazard Index mixtures involving these PFAS plus PFBS. EPA indicated a 60-day written comment period will open following Federal Register publication (via Regulations.gov; Docket ID EPA-HQ-OW-2025-0654) and scheduled a virtual public hearing for July 7, 2026 with pre-registration due July 1, 2026. Compliance teams for water systems and affected stakeholders should track potential scope changes to federal PFAS drinking water standards/requirements and participate in the comment process as appropriate.