PFAS above EPA’s limits in Arizona.
The short answer
21 utilities serving 845,012 people, as they report it, had a location averaging above a limit, most often PFOS (18) and PFOA (15). The largest is Town of Gilbert, whose highest PFOS average was 7.7 ppt, 1.9 times the limit. The furthest above is City of Tempe, at 14 times the PFOS limit.
These are EPA’s survey results, not violations: the limits take effect April 26, 2029, and compliance will rest on each utility’s own monitoring. EPA has proposed changes to the rule; as of Oct. 13, 2026, none is final.
Utilities above a limit
Largest first. Each one’s highest location average is for the limit it is furthest above, with the single highest sample of the same PFAS; its report has every result.
| Utility | Based in | Serves | Above | Highest location average | Highest single sample |
|---|---|---|---|---|---|
| Town of Gilbert | Gilbert | 247,600 | PFOS | PFOS 7.7 ppt1.9 times the limit | 9.8 ppt |
| City of Tempe | Tempe | 165,000 | PFOA, PFOS, PFHxS, Hazard Index | PFOS 55 ppt14 times the limit | 56 ppt |
| City of Avondale | Avondale | 96,130 | PFOA, PFOS | PFOA 12 ppt3 times the limit | 14 ppt |
| Liberty Water Lpsco | Litchfield Park | 57,070 | PFOA, PFOS | PFOS 12 ppt3 times the limit | 14 ppt |
| Goodyear Water Department | Goodyear | 50,001 | PFOA, PFOS | PFOS 7.5 ppt1.9 times the limit | 7.9 ppt |
| City of Prescott | Prescott | 42,217 | PFOA, PFOS | PFOA 11 ppt2.7 times the limit | 11 ppt |
| Bullhead City Mohave | Bullhead City | 36,330 | PFOS | PFOS 4.7 ppt1.2 times the limit | 7.3 ppt |
| Liberty Water Rio Rico | Rio Rico | 17,960 | PFOA, PFOS | PFOS 40 ppt10 times the limit | 41 ppt |
| Town of Payson | Payson | 17,682 | PFOA, PFOS, PFHxS, Hazard Index | PFOA 40 ppt9.9 times the limit | 41 ppt |
| Flowing Wells Irrigation District | Tucson | 16,000 | PFOA, PFOS | PFOA 5.0 ppt1.3 times the limit | 5.0 ppt |
| US Army Fort Huachuca | Fort Huachuca | 15,603 | PFOA, PFOS | PFOA 6.6 ppt1.6 times the limit | 7.0 ppt |
| Marana Municipal - Marana | Marana | 15,162 | PFOA, PFOS, PFHxS, Hazard Index | PFOS 18 ppt4.5 times the limit | 18 ppt |
| Arizona Water Co - Sedona | Sedona | 12,104 | PFOA, PFOS | PFOA 9.7 ppt2.4 times the limit | 10 ppt |
| Epcor - San Tan Anthem | Johnson Ranch | 10,362 | PFOA | PFOA 18 ppt4.5 times the limit | 19 ppt |
| Arizona Water Co - Bisbee | Bisbee | 8,590 | PFOA | PFOA 7.2 ppt1.8 times the limit | 9.7 ppt |
| USAF Luke Air Force Base | Litchfield Park | 8,440 | PFOA, PFOS | PFOS 12 ppt2.9 times the limit | 12 ppt |
| City of Globe | Globe | 7,536 | PFOS, PFHxS, Hazard Index | PFOS 9.4 ppt2.4 times the limit | 9.5 ppt |
| Big Park Water Company | Sedona | 7,392 | PFOA | PFOA 11 ppt2.6 times the limit | 21 ppt |
| Marana Municipal - Hartman Vistas | Marana | 5,408 | PFOS | PFOS 23 ppt5.6 times the limit | 23 ppt |
| North Mohave Valley | Bullhead City | 5,190 | PFOS | PFOS 5.2 ppt1.3 times the limit | 5.5 ppt |
| Gw Farmers Water Co - Santa Rita Springs | Sahuarita | 3,235 | PFOS | PFOS 4.9 ppt1.2 times the limit | 5.0 ppt |
2 more utilities in Arizona had a single sample above a limit but no location average above, so they are not listed; each report shows the sample.
Results: EPA UCMR 5 occurrence data, file of Oct. 15, 2026, samples from Jan. 3, 2023 to June 17, 2026, averaged by sampling location as EPA’s final UCMR 5 data summary does. Every state, and the full data as a CSV; how this list is made. People served is what each utility reports.
Where to go next
- Town of Gilbert’s reportEvery PFAS result with its dates, and the certification claim that handles each.Open the report
- Every stateThe national list, the largest utilities above a limit, and the data to download.PFAS above EPA’s limits
- Filters certified for PFASRanked by certification and what they cost over five years.Best water filters for PFAS