This page summarizes EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR 5, 2023–2025) drinking-water monitoring records linked to ZIP codes in Illinois, 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) | 29 (5.9% of state) | 29 (100.0%) — all detections at/above limit by construction | 0.0083 µg/L | 0.018 µg/L |
| PFOS | 0.004 µg/L (MCL) | 85 (17.2% of state) | 85 (100.0%) — all detections at/above limit by construction | 0.0062 µg/L | 0.017 µg/L |
| PFHxS | 0.01 µg/L (MCL) | 43 (8.7% of state) | 9 (20.9% of detected) | 0.0079 µg/L | 0.0182 µg/L |
| PFNA | 0.01 µg/L (MCL) | 6 (1.2% of state) | 0 (0.0% of detected) | 0.0045 µg/L | 0.0045 µg/L |
| PFBS | 2.0 µg/L (HI reference) | 104 (21.1% of state) | not calculated¹ | 0.007 µg/L | 0.0521 µg/L |
| Lithium | 7.36 µg/L (reference, not a regulatory limit) | 287 (58.2% of state) | 287 (100.0%) at/above reference | 30.1638 µg/L | 230.0 µg/L |
| PFPeA | — (no federal limit) | 180 (36.5% of state) | — | 0.0062 µg/L | 0.0322 µg/L |
| PFBA | — (no federal limit) | 326 (66.1% of state) | — | 0.0118 µg/L | 0.2332 µg/L |
| PFHpA | — (no federal limit) | 6 (1.2% of state) | — | 0.0069 µg/L | 0.0133 µg/L |
| 6:2 FTS | — (no federal limit) | 3 (0.6% of state) | — | 0.0057 µg/L | 0.0063 µg/L |
493 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 |
|---|---|---|
| 60002 | 1 | No |
| 60010 | 1 | No |
| 60013 | 4 | No |
| 60014 | 2 | No |
| 60015 | 1 | No |
| 60020 | 3 | Yes (1) |
| 60021 | 3 | No |
| 60030 | 1 | No |
| 60041 | 3 | Yes (1) |
| 60042 | 1 | No |
| 60047 | 2 | No |
| 60048 | 1 | No |
| 60050 | 8 | Yes (2) |
| 60060 | 1 | No |
| 60073 | 1 | No |
| 60081 | 3 | Yes (1) |
| 60087 | 1 | No |
| 60099 | 1 | No |
| 60110 | 1 | No |
| 60112 | 1 | No |
| 60115 | 1 | No |
| 60118 | 2 | No |
| 60119 | 1 | No |
| 60120 | 3 | No |
| 60123 | 3 | No |
| 60124 | 3 | No |
| 60126 | 1 | No |
| 60134 | 1 | No |
| 60135 | 1 | No |
| 60137 | 1 | Yes (1) |
| 60143 | 2 | No |
| 60148 | 1 | Yes (1) |
| 60152 | 1 | No |
| 60156 | 1 | No |
| 60157 | 2 | No |
| 60174 | 2 | No |
| 60175 | 2 | No |
| 60177 | 5 | Yes (1) |
| 60178 | 1 | No |
| 60183 | 1 | No |
| 60185 | 1 | No |
| 60188 | 1 | No |
| 60401 | 1 | No |
| 60403 | 7 | Yes (2) |
| 60404 | 2 | No |
| 60406 | 2 | Yes (2) |
| 60408 | 1 | No |
| 60409 | 1 | No |
| 60410 | 6 | Yes (2) |
| 60411 | 1 | No |
| 60416 | 1 | No |
| 60417 | 1 | No |
| 60423 | 1 | No |
| 60424 | 1 | No |
| 60426 | 3 | Yes (2) |
| 60430 | 1 | Yes (1) |
| 60431 | 2 | No |
| 60432 | 1 | No |
| 60433 | 2 | No |
| 60435 | 2 | No |
| 60436 | 1 | No |
| 60439 | 1 | No |
| 60440 | 3 | No |
| 60441 | 5 | No |
| 60442 | 1 | No |
| 60445 | 1 | No |
| 60446 | 3 | No |
| 60447 | 6 | Yes (2) |
| 60449 | 1 | No |
| 60450 | 1 | No |
| 60452 | 1 | No |
| 60466 | 1 | No |
| 60468 | 1 | No |
| 60470 | 4 | No |
| 60471 | 1 | No |
| 60473 | 1 | No |
| 60475 | 1 | No |
| 60476 | 1 | No |
| 60477 | 1 | No |
| 60481 | 3 | No |
| 60484 | 1 | No |
| 60501 | 1 | No |
| 60502 | 4 | No |
| 60504 | 4 | No |
| 60505 | 4 | No |
| 60506 | 4 | No |
| 60510 | 1 | No |
| 60514 | 1 | No |
| 60538 | 1 | No |
| 60542 | 1 | No |
| 60543 | 1 | No |
| 60544 | 3 | No |
| 60554 | 2 | No |
| 60555 | 1 | No |
| 60558 | 1 | No |
| 60560 | 1 | No |
| 60564 | 4 | No |
| 60657 | 1 | No |
| 60901 | 1 | No |
| 60911 | 1 | No |
| 60936 | 1 | No |
| 60942 | 1 | No |
| 61008 | 1 | No |
| 61011 | 7 | Yes (3) |
| 61032 | 1 | Yes (1) |
| 61037 | 1 | No |
| 61071 | 2 | No |
| 61072 | 1 | Yes (1) |
| 61073 | 7 | Yes (3) |
| 61080 | 1 | No |
| 61081 | 1 | No |
| 61101 | 2 | No |
| 61102 | 2 | No |
| 61103 | 7 | Yes (3) |
| 61107 | 2 | No |
| 61108 | 2 | No |
| 61109 | 2 | No |
| 61111 | 7 | Yes (3) |
| 61114 | 2 | No |
| 61115 | 7 | Yes (3) |
| 61201 | 1 | No |
| 61232 | 1 | No |
| 61240 | 1 | No |
| 61244 | 2 | No |
| 61252 | 2 | No |
| 61254 | 1 | No |
| 61264 | 1 | No |
| 61265 | 1 | No |
| 61270 | 1 | No |
| 61281 | 1 | No |
| 61282 | 1 | No |
| 61284 | 1 | No |
| 61299 | 2 | Yes (1) |
| 61301 | 3 | No |
| 61311 | 4 | No |
| 61313 | 4 | No |
| 61314 | 1 | No |
| 61319 | 4 | No |
| 61321 | 4 | No |
| 61333 | 4 | No |
| 61341 | 1 | No |
| 61342 | 1 | No |
| 61348 | 1 | No |
| 61350 | 1 | No |
| 61354 | 1 | No |
| 61362 | 1 | No |
| 61364 | 4 | No |
| 61401 | 5 | Yes (2) |
| 61410 | 5 | Yes (2) |
| 61414 | 1 | No |
| 61416 | 1 | No |
| 61422 | 1 | No |
| 61425 | 3 | No |
| 61427 | 2 | No |
| 61430 | 5 | Yes (2) |
| 61439 | 5 | Yes (2) |
| 61443 | 1 | No |
| 61448 | 5 | Yes (2) |
| 61453 | 5 | Yes (2) |
| 61454 | 3 | No |
| 61455 | 1 | No |
| 61462 | 1 | No |
| 61469 | 3 | No |
| 61520 | 2 | No |
| 61523 | 6 | Yes (1) |
| 61525 | 5 | Yes (1) |
| 61526 | 5 | Yes (1) |
| 61528 | 5 | Yes (1) |
| 61535 | 7 | Yes (1) |
| 61536 | 5 | Yes (1) |
| 61539 | 5 | Yes (1) |
| 61545 | 1 | No |
| 61546 | 7 | Yes (1) |
| 61547 | 5 | Yes (1) |
| 61550 | 1 | No |
| 61552 | 5 | Yes (1) |
| 61554 | 7 | Yes (1) |
| 61555 | 7 | Yes (1) |
| 61558 | 7 | Yes (1) |
| 61568 | 7 | Yes (1) |
| 61571 | 4 | Yes (1) |
| 61601 | 5 | Yes (1) |
| 61602 | 5 | Yes (1) |
| 61603 | 6 | Yes (1) |
| 61604 | 6 | Yes (2) |
| 61605 | 5 | Yes (1) |
| 61606 | 5 | Yes (1) |
| 61607 | 5 | Yes (1) |
| 61610 | 1 | No |
| 61611 | 4 | Yes (1) |
| 61612 | 5 | Yes (1) |
| 61613 | 5 | Yes (1) |
| 61614 | 6 | Yes (1) |
| 61615 | 5 | Yes (1) |
| 61616 | 6 | Yes (1) |
| 61625 | 5 | Yes (1) |
| 61629 | 5 | Yes (1) |
| 61630 | 5 | Yes (1) |
| 61633 | 5 | Yes (1) |
| 61634 | 5 | Yes (1) |
| 61636 | 5 | Yes (1) |
| 61637 | 5 | Yes (1) |
| 61638 | 5 | Yes (1) |
| 61639 | 5 | Yes (1) |
| 61641 | 5 | Yes (1) |
| 61643 | 5 | Yes (1) |
| 61650 | 5 | Yes (1) |
| 61651 | 5 | Yes (1) |
| 61652 | 5 | Yes (1) |
| 61653 | 5 | Yes (1) |
| 61654 | 5 | Yes (1) |
| 61655 | 5 | Yes (1) |
| 61656 | 5 | Yes (1) |
| 61701 | 1 | No |
| 61704 | 1 | No |
| 61705 | 1 | No |
| 61740 | 4 | No |
| 61748 | 1 | No |
| 61761 | 1 | No |
| 61764 | 2 | No |
| 61776 | 1 | No |
| 61801 | 1 | No |
| 61802 | 1 | No |
| 61803 | 1 | No |
| 61815 | 1 | No |
| 61820 | 1 | No |
| 61821 | 1 | No |
| 61822 | 1 | No |
| 61824 | 1 | No |
| 61825 | 1 | No |
| 61826 | 1 | No |
| 61832 | 1 | No |
| 61843 | 1 | No |
| 61863 | 1 | No |
| 61872 | 1 | No |
| 61873 | 1 | No |
| 61874 | 1 | No |
| 61877 | 1 | No |
| 61880 | 1 | No |
| 61914 | 1 | No |
| 61920 | 2 | No |
| 61928 | 1 | No |
| 61938 | 1 | No |
| 61953 | 1 | No |
| 61956 | 1 | No |
| 61957 | 1 | No |
| 62001 | 3 | No |
| 62002 | 3 | No |
| 62006 | 3 | No |
| 62010 | 7 | Yes (2) |
| 62011 | 1 | No |
| 62012 | 2 | No |
| 62013 | 1 | No |
| 62014 | 2 | No |
| 62018 | 5 | No |
| 62021 | 2 | No |
| 62022 | 3 | No |
| 62024 | 8 | Yes (2) |
| 62025 | 6 | Yes (2) |
| 62026 | 2 | No |
| 62028 | 3 | No |
| 62031 | 2 | No |
| 62032 | 1 | No |
| 62034 | 3 | No |
| 62035 | 3 | No |
| 62036 | 1 | No |
| 62037 | 3 | No |
| 62040 | 4 | No |
| 62045 | 1 | No |
| 62046 | 3 | No |
| 62047 | 1 | No |
| 62052 | 3 | No |
| 62053 | 1 | No |
| 62058 | 3 | No |
| 62059 | 3 | No |
| 62060 | 3 | No |
| 62061 | 3 | No |
| 62062 | 1 | No |
| 62065 | 1 | No |
| 62067 | 4 | No |
| 62070 | 1 | No |
| 62071 | 3 | No |
| 62074 | 3 | No |
| 62075 | 1 | No |
| 62076 | 1 | No |
| 62080 | 1 | No |
| 62083 | 1 | No |
| 62084 | 4 | Yes (2) |
| 62088 | 2 | No |
| 62090 | 3 | No |
| 62094 | 1 | No |
| 62095 | 2 | No |
| 62097 | 5 | Yes (2) |
| 62201 | 3 | No |
| 62202 | 3 | No |
| 62203 | 3 | No |
| 62204 | 3 | No |
| 62205 | 3 | No |
| 62206 | 4 | No |
| 62207 | 3 | No |
| 62208 | 3 | No |
| 62214 | 1 | No |
| 62217 | 1 | No |
| 62218 | 1 | No |
| 62220 | 3 | No |
| 62221 | 3 | No |
| 62222 | 3 | No |
| 62223 | 3 | No |
| 62225 | 3 | No |
| 62226 | 3 | No |
| 62231 | 1 | No |
| 62232 | 3 | No |
| 62233 | 4 | No |
| 62234 | 8 | Yes (3) |
| 62236 | 6 | Yes (1) |
| 62237 | 1 | No |
| 62238 | 1 | No |
| 62239 | 6 | Yes (1) |
| 62240 | 6 | Yes (1) |
| 62241 | 4 | No |
| 62243 | 1 | Yes (1) |
| 62244 | 1 | No |
| 62246 | 3 | No |
| 62249 | 3 | No |
| 62254 | 2 | No |
| 62255 | 1 | No |
| 62256 | 1 | No |
| 62257 | 1 | No |
| 62258 | 2 | Yes (1) |
| 62260 | 6 | Yes (1) |
| 62263 | 1 | No |
| 62264 | 1 | No |
| 62265 | 1 | Yes (1) |
| 62268 | 1 | No |
| 62269 | 3 | No |
| 62271 | 1 | No |
| 62272 | 1 | No |
| 62274 | 1 | No |
| 62275 | 3 | No |
| 62278 | 1 | No |
| 62281 | 4 | No |
| 62284 | 3 | No |
| 62285 | 3 | No |
| 62286 | 1 | No |
| 62293 | 1 | Yes (1) |
| 62294 | 4 | No |
| 62295 | 1 | No |
| 62298 | 3 | No |
| 62301 | 2 | No |
| 62305 | 3 | No |
| 62326 | 1 | No |
| 62338 | 1 | No |
| 62341 | 2 | No |
| 62354 | 2 | No |
| 62355 | 1 | No |
| 62358 | 2 | No |
| 62360 | 1 | No |
| 62361 | 1 | No |
| 62374 | 1 | No |
| 62379 | 2 | No |
| 62401 | 1 | No |
| 62411 | 1 | No |
| 62413 | 1 | No |
| 62414 | 1 | No |
| 62418 | 1 | No |
| 62419 | 1 | No |
| 62420 | 1 | No |
| 62421 | 1 | No |
| 62422 | 1 | No |
| 62424 | 1 | No |
| 62425 | 1 | No |
| 62426 | 1 | No |
| 62428 | 1 | No |
| 62431 | 1 | No |
| 62432 | 1 | No |
| 62433 | 2 | Yes (1) |
| 62434 | 1 | No |
| 62436 | 1 | No |
| 62438 | 1 | No |
| 62440 | 1 | No |
| 62443 | 1 | No |
| 62444 | 1 | No |
| 62445 | 1 | No |
| 62446 | 1 | No |
| 62447 | 1 | No |
| 62448 | 1 | No |
| 62449 | 3 | Yes (1) |
| 62450 | 1 | No |
| 62451 | 2 | Yes (1) |
| 62452 | 1 | No |
| 62454 | 3 | Yes (1) |
| 62458 | 1 | No |
| 62461 | 1 | No |
| 62462 | 1 | No |
| 62463 | 1 | No |
| 62465 | 1 | No |
| 62466 | 1 | No |
| 62467 | 1 | No |
| 62468 | 1 | No |
| 62469 | 1 | No |
| 62473 | 1 | No |
| 62475 | 1 | No |
| 62476 | 1 | No |
| 62479 | 1 | No |
| 62480 | 1 | No |
| 62481 | 1 | No |
| 62510 | 1 | No |
| 62521 | 1 | No |
| 62534 | 1 | No |
| 62546 | 1 | No |
| 62549 | 1 | No |
| 62550 | 1 | No |
| 62553 | 1 | No |
| 62555 | 1 | No |
| 62557 | 1 | No |
| 62565 | 1 | No |
| 62568 | 1 | No |
| 62571 | 1 | No |
| 62601 | 1 | No |
| 62621 | 2 | No |
| 62626 | 1 | No |
| 62628 | 1 | No |
| 62638 | 1 | No |
| 62650 | 2 | No |
| 62656 | 4 | Yes (1) |
| 62685 | 2 | No |
| 62694 | 2 | No |
| 62703 | 1 | No |
| 62801 | 1 | No |
| 62806 | 1 | No |
| 62808 | 1 | No |
| 62810 | 1 | No |
| 62812 | 1 | No |
| 62814 | 1 | No |
| 62815 | 1 | No |
| 62817 | 2 | No |
| 62821 | 1 | No |
| 62824 | 1 | No |
| 62828 | 1 | No |
| 62830 | 1 | No |
| 62831 | 1 | No |
| 62832 | 1 | No |
| 62835 | 2 | No |
| 62838 | 1 | No |
| 62856 | 1 | No |
| 62858 | 1 | No |
| 62859 | 1 | No |
| 62860 | 2 | No |
| 62863 | 2 | Yes (1) |
| 62864 | 1 | No |
| 62867 | 1 | No |
| 62868 | 1 | No |
| 62869 | 1 | No |
| 62871 | 1 | No |
| 62872 | 1 | No |
| 62877 | 1 | No |
| 62879 | 1 | No |
| 62880 | 1 | No |
| 62883 | 1 | No |
| 62888 | 1 | No |
| 62889 | 1 | No |
| 62890 | 2 | No |
| 62893 | 1 | No |
| 62894 | 1 | No |
| 62895 | 1 | No |
| 62896 | 1 | No |
| 62898 | 1 | No |
| 62906 | 1 | No |
| 62907 | 1 | No |
| 62916 | 1 | No |
| 62917 | 2 | No |
| 62918 | 1 | No |
| 62919 | 1 | No |
| 62922 | 2 | No |
| 62930 | 1 | No |
| 62931 | 1 | No |
| 62934 | 1 | No |
| 62935 | 2 | No |
| 62939 | 1 | No |
| 62946 | 2 | No |
| 62948 | 1 | No |
| 62951 | 1 | No |
| 62952 | 1 | No |
| 62954 | 1 | No |
| 62959 | 1 | No |
| 62966 | 1 | No |
| 62967 | 1 | No |
| 62972 | 1 | No |
| 62974 | 1 | No |
| 62977 | 1 | No |
| 62979 | 1 | No |
| 62984 | 1 | No |
| 62987 | 1 | No |
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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