United States Environmental Protection Agency
Unregulated Contaminant Monitoring Rule (UCMR)
Nationwide monitoring of contaminants that are not yet regulated, conducted in five-year cycles. UCMR 5 covers PFAS and lithium, and provides the largest systematic dataset on PFAS occurrence in US public drinking water.
Rights
- Commercial reuse
- Yes
- Redistribution
- Yes
- Derivative use
- Yes
- Attribution required
- No
- Restrictions
- Applies to material authored by US federal agencies. Third-party material carried within a federal product may be separately protected.
- Terms last checked
- 23 August 2026
Access and coverage
- Publisher
- United States Environmental Protection Agency
- Website
- https://www.epa.gov/dwucmr
- Geographic coverage
- United States — sampled public water systems
- Temporal coverage
- 2001 onwards
- Update frequency
- multi-year
- Formats
- csv, xlsx
- Bulk download
- Available
- Registration required
- No
- Cost to Hydrionis
- Free
- Domains
- contaminant, quality
Notes
UCMR results are reported at the level of the public water system and sampling point, and detections are subject to defined minimum reporting levels. A non-detection means below the reporting level, not necessarily absent.