Arizona tap water
21 of 144 Arizona water systems with full PFAS testing (15%) averaged above a 2024 federal PFAS level at one or more sampling points.
- 746 active community water systems in the EPA file; 131 serve 3,300+ people and have a full PFAS set.
- 298 systems had at least one health-based violation since 2021-10-26.
- 4 systems report a lead 90th percentile above 15 ppb (some results are old; check each system page).
Largest systems
| System | People served | PFAS above a 2024 level? | Health-based violations since 2021-10-26 |
|---|---|---|---|
| Phoenix City of | 1,695,000 | No | 0 |
| Tucson City of | 732,906 | No | 0 |
| Mesa City of | 466,000 | No | 0 |
| Gilbert, Town of | 247,600 | Yes, at one or more sampling points | 0 |
| Chandler City of | 247,328 | No | 0 |
| Scottsdale City of | 241,361 | No | 0 |
| Glendale City of | 234,766 | No | 0 |
| Peoria City of | 187,676 | No | 0 |
Counties
Maricopa County41 systems with full PFAS testingPima County21 systems with full PFAS testingPinal County13 systems with full PFAS testingMohave County11 systems with full PFAS testing
All 26 utilities with a page in Arizona
- Arizona Water CO - Apache Junction 62,055
- Arizona Water CO - Pinal Valley 134,432
- Avondale City of 96,130
- Chandler City of 247,328
- City of Yuma 103,264
- Epcor - Agua Fria 128,040
- Epcor - San Tan 87,435
- Flagstaff City of 79,796
- Gilbert, Town of 247,600
- Glendale City of 234,766
- Goodyear Water department 50,001
- Gw Santa Cruz Water CO 84,000
- Kingman Municipal Water 45,000
- Lake Havasu City of 54,610
- Liberty Water Lpsco 57,070
- Mesa City of 466,000
- Metropolitan Dwid 45,570
- Oro Valley Water Utility 42,316
- Peoria City of 187,676
- Phoenix City of 1,695,000
- Prescott City of 42,217
- Queen Creek Town of 95,502
- Scottsdale City of 241,361
- Tempe City of 165,000
- Town of Prescott Valley 57,048
- Tucson City of 732,906
Why not "the state's water quality"? You drink from one utility, not a state. Rollups count systems, not people, so one large utility counts the same as a small one. Use the system pages for your actual water.
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.