EPA proposes 2026 NPDES Multi-Sector General Permit (MSGP) with report-only PFAS indicator monitoring for certain sectors

EPA’s Proposed 2026 NPDES Multi-Sector General Permit (MSGP) fact sheet includes a new provision for certain industrial sectors to conduct quarterly, report-only indicator analytical monitoring for PFAS. The fact sheet references monitoring for a suite of PFAS compounds aligned with EPA Method 1633, with analysis using EPA Method 1633. Facilities that rely on MSGP coverage should evaluate whether their sector would be subject to PFAS monitoring and prepare for potential sampling/lab capacity and internal reporting workflows if finalized.