Pima County tap water
4 of 25 water systems serving Pima County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 142 community water systems list this county as served; 21 serve 3,300+ people with full PFAS testing.
- 22 had a health-based violation since 2021-10-26.
Largest systems serving this county
| System | Source | People served (whole system) | PFAS above a 2024 level? | Violations since 2021-10-26 |
|---|---|---|---|---|
| Tucson City of | Groundwater | 732,906 | No | 0 |
| Metropolitan Dwid | Groundwater | 45,570 | No | 0 |
| Oro Valley Water Utility | Groundwater | 42,316 | No | 0 |
| Community Wc of Green Valley | Groundwater | 22,085 | No | 0 |
| Usaf Davis Monthan Afb | Groundwater | 18,640 | No | 0 |
| Sahuarita Water Company | Groundwater | 18,178 | No | 0 |
| Vail Water Company | Groundwater | 17,500 | No | 0 |
| Flowing Wells Irrigation District | Groundwater | 16,000 | Yes | 1 |
| Marana Municipal - Marana | Groundwater | 15,162 | Yes | 0 |
| Tucson Water Corona De Tucson | Groundwater | 10,217 | No | 0 |
| Green Valley Dwid | Groundwater | 8,687 | No | 0 |
| Quail Creek Water Company | Groundwater | 6,812 | No | 0 |
Which one is yours? A county usually has several utilities. Your bill or your utility's annual water-quality report names yours. Population is for the whole system, which can cross county lines.
Not medical or legal advice. UCMR 5 results are screening data, not compliance determinations.
Sources and freshness
Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.