# Revisions to the Unregulated Contaminant Monitoring Regulation (UCMR 3) for Public Water Systems
> **Rule** · — · Published 2012-07-25 · 77 FR 43523
## Document
- **Document number:** C2-2012-9978
- **Category:** other
- **Federal Register citation:** 77 FR 43523
- **CFR reference:** 40 CFR 141
- **Publication date:** 2012-07-25
- **EPA docket:** Docket No. EPA-HQ-OW-2009-0090
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/07/25/C2-2012-9978/revisions-to-the-unregulated-contaminant-monitoring-regulation-ucmr-3-for-public-water-systems)
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