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The line / Proposed rules

Proposed rule

Revisions To Establish the Sixth Unregulated Contaminant Monitoring Rule (UCMR 6) for Public Water Systems

Environmental Protection Agency

Federal Register summary (shortened to 600 characters)

The U.S. Environmental Protection Agency (EPA or agency) is proposing the sixth Unregulated Contaminant Monitoring Rule (UCMR 6). Under the Safe Drinking Water Act (SDWA), the UCMR program gathers data about unregulated contaminant occurrence in drinking water. The proposed UCMR 6 would require public water systems (PWSs) to collect national occurrence data for seven ultrashort organofluorine compounds (including certain PFAS), three pesticide metabolites, 13 semivolatile organic compounds, and seven purgeable organic compounds. Subject to the availability of appropriations, the EPA will…

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Document number
2026-13263
Published
Wed, Jul 1, 2026
Comments close
Fri, Jul 31, 2026Closed
First on the line
Oct 10, 2026, 10:00 PM