PERFLUOROCTANE SULFONIC ACID (PFOS) in U.S. Drinking Water

PERFLUOROCTANE SULFONIC ACID (PFOS) is regulated under the EPA Safe Drinking Water Act, which sets enforceable Maximum Contaminant Levels (MCLs) and associated treatment technique requirements for public water systems. The EPA Safe Drinking Water Information System (SDWIS) tracks every recorded violation nationwide and links it back to the specific public water system (PWSID), violation type, and begin date.

Across the United States, PlainEnviro's joined extract contains 997 health-based violation records carrying PERFLUOROCTANE SULFONIC ACID (PFOS) (EPA code 2805) across 103 active community water systems in 5 states. Raw record counts are highest in New York, Connecticut, California, with New York accounting for 346 records across 34 systems. Health-effect prose is shown only when the official ECHO substance name matches a verified topic; otherwise the portal stays silent rather than inventing guidance.

A health-based violation does not mean residents were necessarily harmed, it means the contaminant exceeded the federal MCL in a compliance sample, triggering notification and remediation requirements. States and utilities maintain primary enforcement responsibility. To check the status of a specific water system, request its most recent Consumer Confidence Report or consult the EPA's Drinking Water Watch portal for the corresponding state.