Contaminant 1920 in U.S. Drinking Water

Contaminant 1920 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, SDWIS records show 31 health-based violations for Contaminant 1920 affecting 7 community water systems in 2 states. Violation counts cluster heaviest in New York, Michigan, with New York alone accounting for 29 violations across 6 systems. The contaminant is listed on the federal primary drinking water regulations.

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.