Is there PFAS in Louisville Water Company water?
Some. At least one sample reached an EPA limit, but the average at every sampling point stayed below it.
Louisville Water Company
Serves 806,997 people · 6 PFOA samples from 2 sampling points · Feb 2023 to Nov 2023
One or more samples at an EPA limit
PFOA Perfluorooctanoic acid
1.9 ppt avg · max 7.5
PFOS Perfluorooctanesulfonic acid
not detected
Hazard index GenX, PFBS, PFNA, PFHxS combined
not detected
Also detected, no federal limit: PFPeA, PFHxA, PFBS.
Louisville Water Company is a public water system drawing on surface water, based in Louisville, Kentucky, serving about 806,997 people, including Buckner, Crestwood, Fisherville, Glenview, Goshen, La Grange. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 6 times across 2 sampling points between Feb 2023 and Nov 2023.
Every PFAS detected
Not detected: PFHpA, 11Cl-PF3OUdS, PFUnA, PFDoA, PFDA, PFOS, PFHxS, 9Cl-PF3ONS, PFMBA, PFNA, NEtFOSAA, PFTrDA, PFTA, PFHpS, PFPeS, PFMPA, PFEESA, ADONA, NMeFOSAA, 8:2 FTS, 4:2 FTS, 6:2 FTS, PFBA, HFPO-DA, NFDHA.
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
40010 40014 40023 40025 40026 40031 40041 40047 40056 40059 40109 40110 40118 40150 40165 40202 40203 40204 40205 40206 40207 40208 40209 40210 40211 40212 40213 40214 40215 40216 40217 40218 40219 40220 40222 40223 40228 40229 40241 40242 40243 40245 40258 40272 40280 40291 40292 40299
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 Louisville Water Company water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID KY0560258. https://wellandtap.com/pfas/kentucky/louisville-water-company/
About this data
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID KY0560258). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
