This page summarizes EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR 5, 2023–2025) drinking-water monitoring records linked to ZIP codes in Kentucky, as processed for the PFAS Estimator national dataset. Data updated: July 2026.
| Compound | Applicable threshold | ZIP codes detected | At/above threshold | Mean detected | Maximum detected |
|---|---|---|---|---|---|
| PFOA | 0.004 µg/L (MCL) | 115 (28.5% of state) | 115 (100.0%) — all detections at/above limit by construction | 0.0067 µg/L | 0.01 µg/L |
| PFOS | 0.004 µg/L (MCL) | 40 (9.9% of state) | 40 (100.0%) — all detections at/above limit by construction | 0.0121 µg/L | 0.0479 µg/L |
| PFHxS | 0.01 µg/L (MCL) | 15 (3.7% of state) | 7 (46.7% of detected) | 0.011 µg/L | 0.0336 µg/L |
| PFNA | 0.01 µg/L (MCL) | 3 (0.7% of state) | 0 (0.0% of detected) | 0.0047 µg/L | 0.0047 µg/L |
| HFPO-DA | 0.01 µg/L (MCL) | 15 (3.7% of state) | 12 (80.0% of detected) | 0.0214 µg/L | 0.025 µg/L |
| PFBS | 2.0 µg/L (HI reference) | 142 (35.1% of state) | not calculated¹ | 0.0037 µg/L | 0.0094 µg/L |
| Lithium | 7.36 µg/L (reference, not a regulatory limit) | 196 (48.5% of state) | 196 (100.0%) at/above reference | 18.7269 µg/L | 58.0 µg/L |
| PFPeA | — (no federal limit) | 201 (49.8% of state) | — | 0.0062 µg/L | 0.024 µg/L |
| PFBA | — (no federal limit) | 138 (34.2% of state) | — | 0.0089 µg/L | 0.0512 µg/L |
| PFHpA | — (no federal limit) | 14 (3.5% of state) | — | 0.0103 µg/L | 0.0139 µg/L |
| 6:2 FTS | — (no federal limit) | 56 (13.9% of state) | — | 0.0126 µg/L | 0.023 µg/L |
404 ZIP codes with at least one recorded PFAS detection. Click a ZIP code to view its full compound-level results.
| ZIP code | Compounds detected | At/above threshold |
|---|---|---|
| 40003 | 1 | Yes (1) |
| 40004 | 5 | Yes (1) |
| 40008 | 5 | Yes (1) |
| 40010 | 3 | Yes (1) |
| 40012 | 2 | No |
| 40013 | 4 | Yes (1) |
| 40014 | 3 | Yes (1) |
| 40020 | 4 | Yes (1) |
| 40022 | 2 | Yes (1) |
| 40023 | 3 | Yes (1) |
| 40025 | 3 | Yes (1) |
| 40026 | 3 | Yes (1) |
| 40031 | 3 | Yes (1) |
| 40041 | 3 | Yes (1) |
| 40046 | 2 | Yes (1) |
| 40047 | 4 | Yes (1) |
| 40056 | 3 | Yes (1) |
| 40059 | 3 | Yes (1) |
| 40065 | 2 | Yes (1) |
| 40066 | 1 | No |
| 40067 | 2 | Yes (1) |
| 40071 | 4 | Yes (1) |
| 40078 | 2 | No |
| 40109 | 3 | Yes (1) |
| 40110 | 3 | Yes (1) |
| 40118 | 3 | Yes (1) |
| 40150 | 6 | Yes (2) |
| 40165 | 4 | Yes (1) |
| 40202 | 3 | Yes (1) |
| 40203 | 3 | Yes (1) |
| 40204 | 3 | Yes (1) |
| 40205 | 3 | Yes (1) |
| 40206 | 3 | Yes (1) |
| 40207 | 3 | Yes (1) |
| 40208 | 3 | Yes (1) |
| 40209 | 3 | Yes (1) |
| 40210 | 3 | Yes (1) |
| 40211 | 3 | Yes (1) |
| 40212 | 3 | Yes (1) |
| 40213 | 3 | Yes (1) |
| 40214 | 3 | Yes (1) |
| 40215 | 3 | Yes (1) |
| 40216 | 3 | Yes (1) |
| 40217 | 3 | Yes (1) |
| 40218 | 3 | Yes (1) |
| 40219 | 3 | Yes (1) |
| 40220 | 3 | Yes (1) |
| 40222 | 3 | Yes (1) |
| 40223 | 3 | Yes (1) |
| 40228 | 3 | Yes (1) |
| 40229 | 3 | Yes (1) |
| 40233 | 5 | Yes (1) |
| 40241 | 3 | Yes (1) |
| 40242 | 3 | Yes (1) |
| 40243 | 3 | Yes (1) |
| 40245 | 3 | Yes (1) |
| 40258 | 3 | Yes (1) |
| 40272 | 3 | Yes (1) |
| 40280 | 3 | Yes (1) |
| 40291 | 3 | Yes (1) |
| 40292 | 3 | Yes (1) |
| 40299 | 3 | Yes (1) |
| 40311 | 3 | No |
| 40319 | 1 | No |
| 40322 | 1 | No |
| 40324 | 9 | Yes (2) |
| 40328 | 3 | No |
| 40330 | 2 | No |
| 40336 | 1 | No |
| 40337 | 1 | No |
| 40342 | 2 | No |
| 40346 | 1 | No |
| 40347 | 5 | No |
| 40353 | 1 | No |
| 40355 | 5 | No |
| 40356 | 5 | No |
| 40358 | 1 | No |
| 40359 | 5 | No |
| 40360 | 2 | No |
| 40361 | 8 | Yes (2) |
| 40362 | 5 | No |
| 40370 | 8 | Yes (2) |
| 40371 | 1 | No |
| 40372 | 2 | No |
| 40374 | 2 | No |
| 40379 | 5 | No |
| 40383 | 5 | No |
| 40385 | 1 | No |
| 40390 | 2 | No |
| 40391 | 5 | No |
| 40403 | 1 | No |
| 40422 | 4 | No |
| 40440 | 3 | No |
| 40445 | 1 | No |
| 40452 | 3 | No |
| 40461 | 1 | No |
| 40464 | 3 | No |
| 40468 | 3 | No |
| 40472 | 1 | No |
| 40475 | 2 | No |
| 40476 | 1 | No |
| 40502 | 5 | No |
| 40503 | 5 | No |
| 40504 | 5 | No |
| 40505 | 5 | No |
| 40506 | 5 | No |
| 40507 | 5 | No |
| 40508 | 5 | No |
| 40509 | 5 | No |
| 40510 | 5 | No |
| 40511 | 5 | No |
| 40513 | 5 | No |
| 40514 | 5 | No |
| 40515 | 5 | No |
| 40516 | 5 | No |
| 40517 | 5 | No |
| 40601 | 2 | No |
| 40701 | 6 | Yes (2) |
| 40702 | 4 | Yes (1) |
| 40729 | 1 | No |
| 40740 | 1 | No |
| 40741 | 1 | No |
| 40744 | 1 | No |
| 40759 | 6 | Yes (2) |
| 40763 | 1 | No |
| 40769 | 6 | Yes (2) |
| 40771 | 5 | Yes (2) |
| 40806 | 1 | No |
| 40807 | 1 | No |
| 40810 | 1 | No |
| 40823 | 1 | No |
| 40827 | 1 | No |
| 40831 | 1 | No |
| 40840 | 1 | No |
| 40854 | 1 | No |
| 40858 | 1 | No |
| 40868 | 1 | No |
| 40903 | 1 | No |
| 40906 | 1 | No |
| 40915 | 1 | No |
| 40921 | 1 | No |
| 40930 | 1 | No |
| 40935 | 1 | No |
| 40962 | 2 | No |
| 40977 | 1 | No |
| 40982 | 1 | No |
| 40995 | 1 | No |
| 40997 | 1 | No |
| 41001 | 1 | No |
| 41002 | 2 | No |
| 41003 | 8 | Yes (3) |
| 41004 | 8 | Yes (2) |
| 41005 | 1 | No |
| 41006 | 7 | Yes (1) |
| 41007 | 7 | Yes (1) |
| 41008 | 2 | Yes (1) |
| 41010 | 5 | No |
| 41011 | 1 | No |
| 41014 | 1 | No |
| 41015 | 1 | No |
| 41016 | 1 | No |
| 41017 | 1 | No |
| 41018 | 1 | No |
| 41030 | 2 | No |
| 41031 | 9 | Yes (3) |
| 41033 | 3 | No |
| 41035 | 5 | No |
| 41039 | 5 | Yes (2) |
| 41040 | 8 | Yes (3) |
| 41042 | 1 | No |
| 41043 | 7 | Yes (1) |
| 41044 | 7 | Yes (2) |
| 41046 | 5 | No |
| 41048 | 1 | No |
| 41051 | 2 | No |
| 41052 | 5 | No |
| 41055 | 5 | Yes (2) |
| 41056 | 7 | Yes (2) |
| 41059 | 1 | No |
| 41063 | 2 | No |
| 41064 | 5 | Yes (2) |
| 41071 | 1 | No |
| 41073 | 1 | No |
| 41074 | 1 | No |
| 41075 | 1 | No |
| 41076 | 1 | No |
| 41080 | 1 | No |
| 41083 | 5 | No |
| 41086 | 5 | No |
| 41092 | 2 | No |
| 41094 | 3 | No |
| 41097 | 3 | No |
| 41098 | 5 | No |
| 41101 | 1 | No |
| 41102 | 4 | Yes (1) |
| 41121 | 3 | Yes (1) |
| 41124 | 4 | Yes (1) |
| 41129 | 5 | Yes (2) |
| 41132 | 4 | Yes (1) |
| 41139 | 2 | Yes (1) |
| 41143 | 4 | Yes (1) |
| 41144 | 3 | Yes (1) |
| 41146 | 4 | Yes (1) |
| 41168 | 4 | Yes (1) |
| 41175 | 1 | No |
| 41189 | 1 | No |
| 41201 | 4 | Yes (1) |
| 41203 | 1 | No |
| 41214 | 1 | No |
| 41216 | 1 | No |
| 41222 | 1 | No |
| 41224 | 1 | No |
| 41230 | 4 | Yes (1) |
| 41231 | 1 | No |
| 41232 | 4 | Yes (1) |
| 41240 | 4 | Yes (1) |
| 41250 | 1 | No |
| 41254 | 4 | Yes (1) |
| 41262 | 1 | No |
| 41264 | 4 | Yes (1) |
| 41265 | 1 | No |
| 41267 | 1 | No |
| 41301 | 1 | No |
| 41311 | 6 | Yes (2) |
| 41314 | 1 | No |
| 41317 | 1 | No |
| 41339 | 1 | No |
| 41348 | 1 | No |
| 41367 | 1 | No |
| 41385 | 1 | No |
| 41390 | 1 | No |
| 41501 | 1 | No |
| 41503 | 1 | No |
| 41512 | 1 | No |
| 41513 | 1 | No |
| 41514 | 1 | No |
| 41519 | 1 | No |
| 41520 | 1 | No |
| 41522 | 1 | No |
| 41524 | 1 | No |
| 41527 | 1 | No |
| 41528 | 1 | No |
| 41531 | 1 | No |
| 41534 | 1 | No |
| 41535 | 1 | No |
| 41538 | 1 | No |
| 41539 | 1 | No |
| 41540 | 1 | No |
| 41542 | 1 | No |
| 41543 | 1 | No |
| 41544 | 1 | No |
| 41548 | 1 | No |
| 41554 | 1 | No |
| 41555 | 1 | No |
| 41557 | 1 | No |
| 41558 | 1 | No |
| 41559 | 1 | No |
| 41560 | 1 | No |
| 41561 | 1 | No |
| 41562 | 1 | No |
| 41563 | 1 | No |
| 41564 | 1 | No |
| 41566 | 1 | No |
| 41567 | 1 | No |
| 41568 | 1 | No |
| 41571 | 1 | No |
| 41572 | 1 | No |
| 41601 | 1 | No |
| 41602 | 1 | No |
| 41603 | 1 | No |
| 41604 | 1 | No |
| 41605 | 1 | No |
| 41606 | 1 | No |
| 41607 | 1 | No |
| 41612 | 1 | No |
| 41615 | 1 | No |
| 41616 | 1 | No |
| 41619 | 1 | No |
| 41621 | 1 | No |
| 41622 | 1 | No |
| 41630 | 1 | No |
| 41631 | 1 | No |
| 41635 | 1 | No |
| 41636 | 1 | No |
| 41640 | 1 | No |
| 41642 | 1 | No |
| 41643 | 1 | No |
| 41645 | 1 | No |
| 41647 | 1 | No |
| 41649 | 1 | No |
| 41650 | 1 | No |
| 41651 | 1 | No |
| 41653 | 1 | No |
| 41655 | 1 | No |
| 41659 | 1 | No |
| 41660 | 1 | No |
| 41666 | 1 | No |
| 41667 | 1 | No |
| 41701 | 1 | No |
| 41702 | 1 | No |
| 41712 | 1 | No |
| 41713 | 1 | No |
| 41714 | 1 | No |
| 41719 | 1 | No |
| 41721 | 1 | No |
| 41722 | 1 | No |
| 41723 | 1 | No |
| 41727 | 1 | No |
| 41729 | 1 | No |
| 41731 | 1 | No |
| 41735 | 1 | No |
| 41736 | 1 | No |
| 41739 | 1 | No |
| 41747 | 1 | No |
| 41749 | 1 | No |
| 41751 | 1 | No |
| 41754 | 1 | No |
| 41763 | 1 | No |
| 41773 | 1 | No |
| 41774 | 1 | No |
| 41778 | 1 | No |
| 41858 | 1 | No |
| 42001 | 5 | Yes (2) |
| 42002 | 5 | Yes (2) |
| 42003 | 5 | Yes (2) |
| 42027 | 5 | Yes (2) |
| 42028 | 2 | Yes (1) |
| 42029 | 5 | Yes (2) |
| 42038 | 2 | Yes (1) |
| 42044 | 2 | Yes (1) |
| 42045 | 2 | Yes (1) |
| 42047 | 2 | Yes (1) |
| 42053 | 5 | Yes (2) |
| 42055 | 2 | Yes (1) |
| 42058 | 3 | Yes (2) |
| 42064 | 3 | Yes (1) |
| 42069 | 5 | Yes (2) |
| 42078 | 2 | Yes (1) |
| 42081 | 3 | Yes (2) |
| 42083 | 2 | Yes (1) |
| 42086 | 5 | Yes (2) |
| 42104 | 1 | No |
| 42134 | 1 | No |
| 42135 | 1 | No |
| 42170 | 1 | No |
| 42201 | 1 | No |
| 42206 | 1 | No |
| 42211 | 3 | No |
| 42219 | 1 | No |
| 42220 | 1 | No |
| 42223 | 6 | Yes (3) |
| 42240 | 2 | No |
| 42252 | 1 | No |
| 42256 | 1 | No |
| 42261 | 1 | No |
| 42262 | 1 | No |
| 42273 | 1 | No |
| 42275 | 1 | No |
| 42276 | 1 | No |
| 42288 | 1 | No |
| 42301 | 1 | Yes (1) |
| 42303 | 1 | Yes (1) |
| 42325 | 2 | No |
| 42327 | 1 | Yes (1) |
| 42330 | 2 | No |
| 42337 | 1 | No |
| 42339 | 1 | No |
| 42343 | 1 | Yes (1) |
| 42345 | 1 | No |
| 42347 | 1 | Yes (1) |
| 42348 | 1 | Yes (1) |
| 42351 | 1 | Yes (1) |
| 42352 | 1 | Yes (1) |
| 42355 | 1 | Yes (1) |
| 42366 | 1 | Yes (1) |
| 42368 | 1 | Yes (1) |
| 42372 | 2 | No |
| 42376 | 1 | Yes (1) |
| 42378 | 1 | Yes (1) |
| 42404 | 3 | Yes (1) |
| 42408 | 2 | No |
| 42411 | 2 | No |
| 42413 | 1 | No |
| 42431 | 1 | No |
| 42436 | 1 | No |
| 42437 | 3 | Yes (1) |
| 42441 | 1 | No |
| 42445 | 2 | No |
| 42450 | 1 | No |
| 42453 | 1 | No |
| 42456 | 1 | No |
| 42459 | 3 | Yes (1) |
| 42460 | 3 | Yes (1) |
| 42461 | 3 | Yes (1) |
| 42462 | 3 | Yes (1) |
| 42464 | 1 | No |
| 42631 | 1 | No |
| 42634 | 1 | No |
| 42635 | 1 | No |
| 42642 | 1 | No |
| 42649 | 1 | No |
| 42653 | 1 | No |
| 42701 | 6 | Yes (2) |
| 42788 | 6 | Yes (2) |
Results are based on EPA UCMR 5 monitoring data (2023–2025), linked to ZIP codes via Public Water System Identifier. Non-detections are not present in this analytic dataset. For each compound and ZIP code, the highest observed concentration across the monitoring period is retained; this characterizes the upper bound of observed drinking-water concentrations, not a long-term average or an individual exposure estimate. A single water system may serve multiple ZIP codes, so the same monitoring record can appear for more than one ZIP in this table. ZIP-code assignment reflects water-system service area geography and does not establish individual household exposure. Private wells are not represented unless served by a monitored public water system. PFOA and PFOS are reported by detection prevalence because the UCMR 5 reporting limit equals their federal MCL. A full PFBS Hazard Index is not calculated because co-located, same-event multi-compound readings are not retained in this dataset. Lithium has no federal Maximum Contaminant Level; 7.36 µg/L is an evidence-based reference concentration from a prospective cohort study, not a regulatory threshold.
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