Yes, at low levels. 1 PFAS was detected, all below EPA's 2024 limits.
Also detected, no federal limit: PFBA.
City of Tucson is a public water system drawing on groundwater, Arizona, serving about 732,906 people, including Vail, Marana, Tucson. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 162 times across 83 sampling points between Jan 2024 and Nov 2025.
| PFAS | Detected | Highest | Worst point avg | EPA limit |
|---|---|---|---|---|
| PFBA Perfluorobutanoic acid |
1 of 162 | 8.1 ppt | 4.0 ppt | none |
Not detected: PFPeA, PFHpA, PFHxS, PFNA, PFOS, PFOA, PFDA, PFDoA, PFHxA, 11Cl-PF3OUdS, 9Cl-PF3ONS, ADONA, HFPO-DA, PFBS, PFUnA, NEtFOSAA, PFPeS, 6:2 FTS, 4:2 FTS, 8:2 FTS, PFMPA, PFMBA, PFEESA, NFDHA, PFHpS, PFTA, PFTrDA, NMeFOSAA.
Lithium, tested in the same program: highest 63.7 ppb, detected in 112 of 162 samples. EPA's health-based screening level is 10 ppb.
In April 2024 EPA set enforceable limits of 4 ppt for PFOA and PFOS, 10 ppt each for PFHxS, PFNA and GenX, and a hazard index of 1 for mixtures. Utilities were given until 2029 to comply. In May 2026 EPA proposed keeping only the PFOA and PFOS limits and moving that deadline to 2031. Until that proposal is final, the 2024 limits stand.
Compliance is judged on a running annual average at each entry point, so we show the average at this system's worst sampling point next to its single highest result. UCMR 5 results do not by themselves put a utility in or out of compliance.
Levels here are under EPA's limits, so no treatment is required. If you want them lower anyway, a certified reverse osmosis system under the sink handles drinking water, and a whole-house carbon filter also takes out the chlorine or chloramine your utility adds.
All 152 tested systems in Arizona
85641 85658 85701 85704 85705 85706 85707 85710 85711 85712 85713 85714 85715 85716 85718 85719 85730 85735 85736 85741 85742 85743 85745 85746 85747 85748 85749 85750 85755 85756 85757
As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.
Well & Tap. "PFAS in City of Tucson water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID AZ0410112. https://wellandtap.com/pfas/arizona/city-of-tucson/
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID AZ0410112). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
