No PFAS were detected in any of the 2 samples EPA's program collected.
Rathbun Regional Water Assn (rathbun) is a public water system drawing on surface water, based in Centerville, Iowa, serving about 33,000 people, including Allerton, Bussey, Chariton, Clio, Columbia, Corydon. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 2 times across 2 sampling points between Nov 2023 and Aug 2024.
None of the 29 PFAS were found at or above EPA's minimum reporting levels (2 to 20 ppt depending on the compound).
Not detected: NEtFOSAA, PFTrDA, NMeFOSAA, PFTA, PFHpS, PFBA, 6:2 FTS, 4:2 FTS, PFMPA, PFMBA, PFEESA, PFPeS, HFPO-DA, 8:2 FTS, NFDHA, PFNA, PFPeA, ADONA, PFBS, PFHxS, PFOS, PFOA, PFDA, PFDoA, PFHxA, PFUnA, 11Cl-PF3OUdS, 9Cl-PF3ONS, PFHpA.
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.
No PFAS action is needed on these results. If your water tastes or smells of chlorine, a whole-house city water filter is the usual fix.
All 152 tested systems in Iowa
50008 50044 50049 50052 50057 50060 50068 50103 50116 50123 50138 50139 50144 50147 50150 50151 50165 50238 50264 50272 50275 52501 52531 52533 52535 52536 52537 52542 52544 52549 52551 52552 52553 52554 52555 52556 52560 52565 52567 52569 52570 52571 52572 52573 52574 52581 52583 52584 52588 52590 52593 52594 52620 52626 52630 52651 63465 63535 63548 63555 63565 64661 64672
As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.
Well & Tap. "PFAS in Rathbun Regional Water Assn (rathbun) water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID IA0400900. https://wellandtap.com/pfas/iowa/rathbun-regional-water-assn-rathbun/
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID IA0400900). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
