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Is there PFAS in Epcor Water - Mohave water?

Yes. EPA's final UCMR 5 results show Epcor Water - Mohave averaged 4.7 ppt of PFOS at its worst sampling point, 1.2 times the EPA limit of 4 ppt.

Epcor Water - Mohave Serves 36,330 people · 12 PFOA samples from 6 sampling points · Mar 2025 to Nov 2025 Average above an EPA limit
PFOA Perfluorooctanoic acid 2.6 ppt avg · max 5.3
EPA 4
PFOS Perfluorooctanesulfonic acid 4.7 ppt avg · max 7.3
EPA 4
PFHxS Perfluorohexanesulfonic acid 3.5 ppt avg · max 7.0
EPA 10
Hazard index GenX, PFBS, PFNA, PFHxS combined 0.3 avg · max 0.7
EPA 1

Also detected, no federal limit: PFPeA, PFBS, PFHxA.

Averages are for the worst sampling point, with non-detects counted as zero. Source: EPA UCMR 5.

Epcor Water - Mohave is a public water system drawing on groundwater, based in Bullhead City, Arizona, serving about 36,330 people. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 12 times across 6 sampling points between Mar 2025 and Nov 2025.

Every PFAS detected

PFAS Detected Highest Worst point avg EPA limit
PFOS
Perfluorooctanesulfonic acid		 4 of 12 7.3 ppt 4.7 ppt 4 ppt
PFHxS
Perfluorohexanesulfonic acid		 1 of 12 7.0 ppt 3.5 ppt 10 ppt
PFOA
Perfluorooctanoic acid		 1 of 12 5.3 ppt 2.6 ppt 4 ppt
PFPeA
Perfluoropentanoic acid		 2 of 12 3.7 ppt 3.4 ppt none
PFBS
Perfluorobutanesulfonic acid		 1 of 12 3.1 ppt 1.6 ppt none
PFHxA
Perfluorohexanoic acid		 1 of 12 3.0 ppt 1.5 ppt none

Not detected: PFTA, PFDA, PFNA, PFHpA, NMeFOSAA, PFTrDA, PFDoA, NEtFOSAA, PFMBA, PFHpS, PFPeS, NFDHA, PFEESA, PFMPA, 8:2 FTS, 4:2 FTS, ADONA, 6:2 FTS, PFBA, HFPO-DA, PFUnA, 11Cl-PF3OUdS, 9Cl-PF3ONS.

Lithium, tested in the same program: highest 90.8 ppb, detected in 12 of 12 samples. EPA's health-based screening level is 10 ppb.

What the EPA limits mean here

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.

What you can do at home

Two routes work for PFAS. For drinking and cooking water only, a reverse osmosis system certified to NSF/ANSI 58 with a PFOA/PFOS reduction claim is the cheapest proven option. To treat every tap and shower, a whole-house carbon system with enough contact time works, but check that the maker has PFAS test data, not just a marketing claim. See the best filters for PFAS and how PFAS removal works.

Other systems in Arizona

All 152 tested systems in Arizona

ZIP codes served

86442

As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.

Cite this page

Well & Tap. "PFAS in Epcor Water - Mohave water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID AZ0408032. https://wellandtap.com/pfas/arizona/epcor-water-mohave/

About this data

Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID AZ0408032). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.