Is there PFAS in Firgrove Mutual INC water?
Yes. EPA's final UCMR 5 results show Firgrove Mutual INC averaged 8.6 ppt of PFOS at its worst sampling point, 2.1 times the EPA limit of 4 ppt.
Firgrove Mutual INC
Serves 36,168 people · 27 PFOA samples from 13 sampling points · Jan 2023 to Jan 2024
Average above an EPA limit
PFOA Perfluorooctanoic acid
4.4 ppt avg
PFOS Perfluorooctanesulfonic acid
8.6 ppt avg
Hazard index GenX, PFBS, PFNA, PFHxS combined
not detected
Also detected, no federal limit: PFBS.
Firgrove Mutual INC is a public water system drawing on surface water, based in Puyallup, Washington, serving about 36,168 people, including Graham, Puyallup. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 27 times across 13 sampling points between Jan 2023 and Jan 2024.
Every PFAS detected
Not detected: PFHxS, ADONA, PFHxA, PFDoA, PFDA, PFNA, PFHpA, PFPeS, PFMBA, PFPeA, PFUnA, PFMPA, PFTA, NEtFOSAA, PFTrDA, NMeFOSAA, 11Cl-PF3OUdS, PFHpS, NFDHA, PFEESA, 8:2 FTS, 4:2 FTS, 6:2 FTS, PFBA, HFPO-DA, 9Cl-PF3ONS.
Lithium, tested in the same program: not detected.
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 Washington
All 248 tested systems in Washington
ZIP codes served
98338 98373 98374 98375
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 Firgrove Mutual INC water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID WA5325200. https://wellandtap.com/pfas/washington/firgrove-mutual-inc/
About this data
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID WA5325200). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
