Is there PFAS in Harrison CO Water Assoc water?
Yes. EPA's final UCMR 5 results show Harrison CO Water Assoc averaged 15.1 ppt of PFOS at its worst sampling point, 3.8 times the EPA limit of 4 ppt.
Harrison CO Water Assoc
Serves 16,736 people · 8 PFOA samples from 2 sampling points · Mar 2024 to Dec 2024
Average above an EPA limit
PFOA Perfluorooctanoic acid
not detected
PFOS Perfluorooctanesulfonic acid
15.1 ppt avg · max 47.9
PFHxS Perfluorohexanesulfonic acid
4.9 ppt avg · max 15.3
Hazard index GenX, PFBS, PFNA, PFHxS combined
0.5 avg · max 1.5
Also detected, no federal limit: PFPeA, PFHxA, PFBA, PFHpA, PFBS.
Harrison CO Water Assoc is a public water system drawing on surface water, based in Cynthiana, Kentucky, serving about 16,736 people, including Paris, Sadieville, Berry, Cynthiana, Falmouth. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 8 times across 2 sampling points between Mar 2024 and Dec 2024.
Every PFAS detected
Not detected: 11Cl-PF3OUdS, 9Cl-PF3ONS, ADONA, HFPO-DA, 6:2 FTS, 4:2 FTS, PFEESA, PFMPA, PFMBA, PFUnA, PFHpS, NFDHA, 8:2 FTS, PFPeS, NMeFOSAA, NEtFOSAA, PFTrDA, PFTA, PFNA, PFOA, PFDA, PFDoA.
Lithium, tested in the same program: not detected.
What the EPA limits mean here
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.
What you can do at home
Two routes work for PFAS. For drinking and cooking water only, a reverse osmosis system certified to NSF/ANSI 58 with a PFOA/PFOS reduction claim is the cheapest proven option. To treat every tap and shower, a whole-house carbon system with enough contact time works, but check that the maker has PFAS test data, not just a marketing claim. See the best filters for PFAS and how PFAS removal works.
Other systems in Kentucky
All 231 tested systems in Kentucky
ZIP codes served
40361 40370 41003 41031 41040
As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.
Cite this page
Well & Tap. "PFAS in Harrison CO Water Assoc water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID KY0490179. https://wellandtap.com/pfas/kentucky/harrison-co-water-assoc/
About this data
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID KY0490179). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
