Data / Federal rules / 2026-13263
Revisions To Establish the Sixth Unregulated Contaminant Monitoring Rule (UCMR 6) for Public Water Systems
The Environmental Protection Agency published this proposed rule in the Federal Register on July 1, 2026. Comments closed on July 31, 2026.
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What the agency says
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 require all community and non-transient non-community water systems (CWSs and NTNCWSs) serving 3,300 or more people, and a representative sample of PWSs serving fewer than 3,300 people, to conduct monitoring. These contaminants are not currently subject to national primary drinking water regulations (NPDWRs), and the EPA is proposing to require the collection of drinking water occurrence data to inform agency decisions. The data collected will be publicly available. The EPA is also announcing two public meetings (via webinar) to discuss this proposal of the sixth Unregulated Contaminant Monitoring Rule (UCMR 6).
Key facts
- Document number
- 2026-13263
- Type
- Proposed rule
- Action
- Proposed rule; notice of public meeting
- Agency
- Environmental Protection Agency
- Published
- July 1, 2026
- Comments due
- July 31, 2026
- Dates
- Comments must be received on or before August 31, 2026. Comments on the information collection provisions of the proposed rule under the Paperwork Reduction Act (PRA) must be received by the Office of Management and Budget's Office of Information and Regulatory Affairs (OMB-OIRA) on or before July 31, 2026. Please refer to the PRA section under "Statutory and Executive Order Reviews" in this preamble for specific instructions. Public meeting: the EPA will hold two identical virtual, public meetings on August 11, 2026 and August 12, 2026 at https://www.epa.gov/dwucmr/unregulated-contaminant-mon
- Docket
- EPA-HQ-OW-2023-0469; FRL-10857-03-OW
- Regulation ID (RIN)
- 2040-AG33
- Code of Federal Regulations
- 40 CFR 141
- Topics
- Chemicals; Environmental protection; Incorporation by reference; Indians-lands; Intergovernmental relations; Reporting and recordkeeping requirements; Water supply
- Significant
- Yes, under Executive Order 12866
- Pages
- 22
Other documents from the Environmental Protection Agency
Everything from the Environmental Protection Agency · Rules on chemicals · Rules on environmental protection · Rules on incorporation by reference · Published in July 2026
Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.