Yes, at low levels. 1 PFAS was detected, all below EPA's 2024 limits.
Also detected, no federal limit: PFBS.
Southwest Regional Water District is a public water system drawing on groundwater, based in Hamilton, Ohio, serving about 42,856 people, including College Corner, Franklin, Hamilton, Fairfield, Harrison, Middletown. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 4 times across 2 sampling points between Apr 2023 and Oct 2023.
| PFAS | Detected | Highest | Worst point avg | EPA limit |
|---|---|---|---|---|
| PFBS Perfluorobutanesulfonic acid |
1 of 4 | 3.1 ppt | 1.6 ppt | none |
Not detected: 11Cl-PF3OUdS, PFUnA, 4:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, PFBA, 6:2 FTS, 8:2 FTS, PFMPA, PFPeA, PFMBA, NFDHA, PFHpS, PFNA, PFHxA, PFPeS, PFDoA, PFTrDA, NEtFOSAA, PFOA, PFEESA, PFTA, PFHpA, PFHxS, PFOS, PFDA, NMeFOSAA.
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 347 tested systems in Ohio
45003 45005 45011 45013 45014 45030 45042 45053 45056 45064 45067 45070 45311 45327 47003 47010 47012 47016 47060
As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.
Well & Tap. "PFAS in Southwest Regional Water District water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID OH0903912. https://wellandtap.com/pfas/ohio/southwest-regional-water-district/
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID OH0903912). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
