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

**Action Urgency Score:** 45/100

| Field | Value |
|---|---|
| Agency | Environmental Protection Agency |
| Type | Proposed rule |
| Action | Proposed rule; notice of public meeting. |
| Published | 2026-07-01 |
| Comments close | 2026-07-31 |
| Significant | Yes (EO 12866) |
| CFR parts | 40 CFR 141 |
| Summary | 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 requi |
| Document number | 2026-13263 |

## Why this score
- Significant rule under EO 12866.

Source: Federal Register API (Office of the Federal Register) (https://www.federalregister.gov/documents/2026/07/01/2026-13263/revisions-to-establish-the-sixth-unregulated-contaminant-monitoring-rule-ucmr-6-for-public-water). Last refreshed: 2026-11-04T09:17:43.641Z.
Data from the Federal Register API; the published Federal Register document is authoritative. Informational only, not legal advice.