Yes, at low levels. 1 PFAS was detected, all below EPA's 2024 limits.
Also detected, no federal limit: PFBA.
Thomas Hill Pwsd 1 is a public water system drawing on surface water, based in Moberly, Missouri, serving about 11,250 people, including Florissant, Hillsboro, Washington, Saint Louis, Defiance, O Fallon. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 6 times across 2 sampling points between Apr 2024 and Oct 2025.
| PFAS | Detected | Highest | Worst point avg | EPA limit |
|---|---|---|---|---|
| PFBA Perfluorobutanoic acid |
6 of 6 | 9.3 ppt | 7.7 ppt | none |
Not detected: PFDA, PFDoA, PFHxS, PFOS, PFNA, PFHxA, PFHpA, PFBS, NMeFOSAA, NEtFOSAA, PFTA, PFUnA, PFMPA, PFOA, PFTrDA, NFDHA, 4:2 FTS, 11Cl-PF3OUdS, PFHpS, PFPeS, PFEESA, PFMBA, ADONA, 9Cl-PF3ONS, PFPeA, HFPO-DA, 6:2 FTS, 8:2 FTS.
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 232 tested systems in Missouri
63031 63050 63090 63109 63341 63368 63534 63558 63640 63670 64015 64020 64117 64118 64131 64134 64658 65010 65201 65202 65203 65205 65230 65243 65244 65247 65248 65254 65255 65256 65257 65259 65260 65261 65263 65270 65274 65275 65278 65279 65281 65322 65333 65340 65566 65821
As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.
Well & Tap. "PFAS in Thomas Hill Pwsd 1 water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID MO2024504. https://wellandtap.com/pfas/missouri/thomas-hill-pwsd-1/
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID MO2024504). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
