No PFAS were detected in any of the 4 samples EPA's program collected.
Sirwa #2 (creston) is a public water system drawing on surface water, based in Creston, Iowa, serving about 20,793 people, including Davis City, Decatur, Derby, Ellston, Grand River, Kellerton. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 4 times across 1 sampling point between Mar 2024 and Dec 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: PFHpS, PFHxS, PFOS, PFDA, ADONA, PFTA, PFTrDA, NEtFOSAA, NMeFOSAA, PFNA, PFBS, PFHpA, PFOA, PFDoA, PFUnA, PFHxA, 9Cl-PF3ONS, PFPeS, HFPO-DA, PFBA, 6:2 FTS, 4:2 FTS, 8:2 FTS, PFMPA, PFPeA, PFMBA, PFEESA, NFDHA, 11Cl-PF3OUdS.
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
50065 50067 50068 50074 50108 50133 50140 50144 50149 50151 50155 50174 50210 50213 50254 50257 50262 50264 50273 50275 50801 50830 50831 50833 50835 50836 50837 50840 50841 50842 50845 50848 50849 50851 50854 50857 50858 50859 50860 50861 50862 50863 51646
As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.
Well & Tap. "PFAS in Sirwa #2 (creston) water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID IA8080701. https://wellandtap.com/pfas/iowa/sirwa-2-creston/
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID IA8080701). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
