Yes, at low levels. 1 PFAS was detected, all below EPA's 2024 limits.
Also detected, no federal limit: PFBA.
E J Water Coop is a public water system drawing on surface water, based in Dieterich, Illinois, serving about 29,720 people, including Bethany, Charleston, Gays, Windsor, Bingham, Fillmore. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 16 times across 6 sampling points between Nov 2023 and Apr 2025.
| PFAS | Detected | Highest | Worst point avg | EPA limit |
|---|---|---|---|---|
| PFBA Perfluorobutanoic acid |
1 of 16 | 6.2 ppt | 3.1 ppt | none |
Not detected: PFMPA, NFDHA, 8:2 FTS, PFPeA, PFMBA, PFEESA, PFPeS, PFHpS, PFTA, PFTrDA, NMeFOSAA, 4:2 FTS, PFDoA, NEtFOSAA, PFHxS, 6:2 FTS, PFUnA, PFNA, PFOS, PFOA, PFDA, PFHpA, PFBS, 11Cl-PF3OUdS, 9Cl-PF3ONS, ADONA, HFPO-DA, PFHxA.
Lithium, tested in the same program: not detected.
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 487 tested systems in Illinois
61914 61920 61928 61957 62011 62032 62075 62076 62080 62083 62094 62401 62411 62413 62414 62418 62419 62420 62421 62422 62424 62425 62426 62428 62431 62432 62434 62436 62438 62440 62443 62444 62445 62446 62447 62448 62449 62450 62452 62454 62458 62461 62462 62463 62465 62466 62467 62468 62469 62473 62475 62476 62479 62480 62481 62510 62534 62546 62550 62553 62555 62557 62565 62568 62571 62806 62815 62824 62838 62858 62868 62879 62880
As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.
Well & Tap. "PFAS in E J Water Coop water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID IL0790010. https://wellandtap.com/pfas/illinois/e-j-water-coop/
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID IL0790010). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
