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

> **EPA** · Rulemaking · Modified 2026-05-12T21:26:07Z

## Docket
- **Docket ID:** EPA-HQ-OW-2023-0469
- **Agency:** EPA
- **Type:** Rulemaking
- **Last modified:** 2026-05-12T21:26:07Z

## Source
- [regulations.gov docket](https://www.regulations.gov/docket/EPA-HQ-OW-2023-0469)
- [Public comments](https://www.regulations.gov/docket/EPA-HQ-OW-2023-0469/comments)

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