By State · IL
Based on EPA UCMR 5 testing of 199 public water systems with PFAS detected in Illinois.
See Illinois on the national heatmapState totals reflect systems with at least one PFAS detection in UCMR 5 (the canonical EPA dataset). The 6,151 national total includes ~123 additional systems in US territories and on tribal lands not browsable as state pages.
Most contaminated in Illinois
27 Illinois water systems tested above EPA PFAS limits. The most severe is COLLINSVILLE, IL, where PFOA measured 18.0 ppt — 4.5× the federal limit.
State context
Industrial context
Illinois's PFAS exposure profile is wide: chrome plating and electronics manufacturing in greater Chicago, the former Joliet Arsenal AFFF site, military fire-training at Scott AFB (St. Clair County), and downstream impacts in the Mississippi River corridor.
Regulatory stance
The Illinois EPA has established Public Health Advisory levels for several PFAS compounds and is among the state agencies most actively monitoring municipal PFAS testing results.
Notable sites
Communities downstream of legacy industrial sites in the Chicago area, plus the Joliet/Will County corridor, have reported PFAS detections in public water testing.
Editorial summary compiled from public DoD, EPA, and state agency disclosures. Not a comprehensive site inventory — for the authoritative list of PFAS investigation locations in Illinois, consult your state environmental agency.
Systems with detections · EPA UCMR 5 (2023–2025)
Get specific results for your neighborhood's water utility.
City overviews aggregate every utility and ZIP code in the area. Don't see your city? Use the ZIP lookup above — every Illinois ZIP has a result.
| Water System ↕ | PWSID | PFAS Detected ↕ | Above MCL ↕ | Risk |
|---|---|---|---|---|
| COLLINSVILLE, IL Groundwater | IL1194280 | 8 | 3 | High Risk |
| NORTH PARK PWD Groundwater | IL2015500 | 8 | 3 | High Risk |
| EAST ALTON Groundwater | IL1190200 | 9 | 2 | High Risk |
| CREST HILL Groundwater | IL1970250 | 8 | 2 | High Risk |
| CHANNAHON Groundwater | IL1970200 | 7 | 2 | High Risk |
| ABINGDON Groundwater | IL0950050 | 5 | 2 | High Risk |
| GALESBURG Groundwater | IL0950200 | 5 | 2 | High Risk |
| NORTH EAST CENTRAL PWD Groundwater | IL1195280 | 4 | 2 | High Risk |
| DIXMOOR Surface Water | IL0310660 | 2 | 2 | High Risk |
| Prairie Path Water Co. - Whispering Hills Groundwater | IL1115700 | 8 | 1 | High Risk |
| IL AMERICAN-PEKIN Groundwater | IL1795040 | 8 | 1 | High Risk |
| SOUTH ELGIN Groundwater | IL0890800 | 6 | 1 | High Risk |
| IL AMERICAN-PEORIA Groundwater | IL1435030 | 6 | 1 | High Risk |
| IL American - Lincoln GU | IL1075030 | 5 | 1 | High Risk |
| DUPO Groundwater | IL1630350 | 4 | 1 | High Risk |
| EAST PEORIA Groundwater | IL1790200 | 4 | 1 | High Risk |
| FOX LAKE Groundwater | IL0970200 | 3 | 1 | High Risk |
| PLEASANT VALLEY PWD Groundwater | IL1435470 | 3 | 1 | High Risk |
| ROBINSON-PALESTINE WATER COMMISSION Groundwater | IL0335030 | 2 | 1 | High Risk |
| ROCK ISLAND ARSENAL, US ARMY Surface Water | IL1615387 | 2 | 1 | High Risk |
| MOUNT CARMEL GU | IL1850200 | 2 | 1 | High Risk |
| NEW BADEN Surface Water | IL0274700 | 1 | 1 | High Risk |
| HOMEWOOD Surface Water | IL0311350 | 1 | 1 | High Risk |
| IL AMERICAN-VALLEY VIEW Surface Water | IL0437350 | 1 | 1 | High Risk |
| FREEBURG Surface Water | IL1630600 | 1 | 1 | High Risk |
| FREEPORT Groundwater | IL1770200 | 1 | 1 | High Risk |
| ROCKTON Groundwater | IL2010350 | 1 | 1 | High Risk |
| AURORA Surface Water | IL0894070 | 5 | 0 | Moderate |
| IL AMERICAN-STREATOR Surface Water | IL0995030 | 5 | 0 | Moderate |
| CARY Groundwater | IL1110100 | 5 | 0 | Moderate |
| PEORIA HEIGHTS Groundwater | IL1434750 | 5 | 0 | Moderate |
| MILLSTADT Surface Water | IL1630850 | 5 | 0 | Moderate |
| LOCKPORT Groundwater | IL1970500 | 5 | 0 | Moderate |
| BOND/MADISON WATER COMPANY Surface Water | IL0050020 | 4 | 0 | Low Level |
| ELGIN, IL Surface Water | IL0894380 | 4 | 0 | Low Level |
| FOX RIVER GROVE Groundwater | IL1110200 | 4 | 0 | Low Level |
| GLEN CARBON Surface Water | IL1190300 | 4 | 0 | Low Level |
| IL AMERICAN-GRANITE CITY Surface Water | IL1195030 | 4 | 0 | Low Level |
| IL AMERICAN-ALTON Surface Water | IL1195150 | 4 | 0 | Low Level |
| MITCHELL PWD Surface Water | IL1195210 | 4 | 0 | Low Level |
| CHESTER Surface Water | IL1570100 | 4 | 0 | Low Level |
| CAHOKIA HEIGHTS Surface Water | IL1635000 | 4 | 0 | Low Level |
| IL AMERICAN-EAST ST LOUIS Surface Water | IL1635040 | 4 | 0 | Low Level |
| ROMEOVILLE Groundwater | IL1970900 | 4 | 0 | Low Level |
| WILMINGTON Surface Water | IL1971100 | 4 | 0 | Low Level |
| WEE-MA-TUK WATER DISTRICT GU | IL0570040 | 3 | 0 | Low Level |
| CANTON, IL GU | IL0570250 | 3 | 0 | Low Level |
| JERSEY RWC Surface Water | IL0835300 | 3 | 0 | Low Level |
| WILLOW LAKE ESTATES MHP Surface Water | IL0894400 | 3 | 0 | Low Level |
| LAKE ZURICH Groundwater | IL0970850 | 3 | 0 | Low Level |
| LA SALLE Groundwater | IL0990300 | 3 | 0 | Low Level |
| BRIGHTON Surface Water | IL1174160 | 3 | 0 | Low Level |
| MORO PWD Groundwater | IL1195250 | 3 | 0 | Low Level |
| PONTOON BEACH PWD Surface Water | IL1195300 | 3 | 0 | Low Level |
| COLUMBIA Surface Water | IL1330050 | 3 | 0 | Low Level |
| WATERLOO Surface Water | IL1330300 | 3 | 0 | Low Level |
| SOUTH JACKSONVILLE Groundwater | IL1370400 | 3 | 0 | Low Level |
| CHILLICOTHE Groundwater | IL1430200 | 3 | 0 | Low Level |
| AMERICAN WATER OPER AND MAINTENANCE, LLC Surface Water | IL1635237 | 3 | 0 | Low Level |
| QUINCY Surface Water | IL0010650 | 2 | 0 | Low Level |
| CALUMET CITY Surface Water | IL0310390 | 2 | 0 | Low Level |
| GENOA Groundwater | IL0370150 | 2 | 0 | Low Level |
| ITASCA Groundwater | IL0430500 | 2 | 0 | Low Level |
| MINOOKA Groundwater | IL0630550 | 2 | 0 | Low Level |
| SUGAR GROVE Groundwater | IL0890850 | 2 | 0 | Low Level |
| ST CHARLES Groundwater | IL0894830 | 2 | 0 | Low Level |
| IL AMERICAN-PONTIAC Surface Water | IL1055030 | 2 | 0 | Low Level |
| CRYSTAL LAKE Groundwater | IL1110150 | 2 | 0 | Low Level |
| MCHENRY Groundwater | IL1110600 | 2 | 0 | Low Level |
| BETHALTO Groundwater | IL1190150 | 2 | 0 | Low Level |
| TROY, IL Groundwater | IL1191000 | 2 | 0 | Low Level |
| WOOD RIVER Groundwater | IL1191150 | 2 | 0 | Low Level |
| FOSTERBURG PWD Surface Water | IL1195220 | 2 | 0 | Low Level |
| SOUTHERN IL UNIVERSITY-EDWARDSVILLE Groundwater | IL1195550 | 2 | 0 | Low Level |
| EAST MOLINE Surface Water | IL1610250 | 2 | 0 | Low Level |
| CASEYVILLE Surface Water | IL1630250 | 2 | 0 | Low Level |
| O FALLON Surface Water | IL1631100 | 2 | 0 | Low Level |
| FULTON Groundwater | IL1950250 | 2 | 0 | Low Level |
| AQUA ILLINOIS-UNIVERSITY PARK Surface Water | IL1975030 | 2 | 0 | Low Level |
| SHOREWOOD, IL Groundwater | IL1975080 | 2 | 0 | Low Level |
| CRYSTAL LAWNS ADDITION IMPROVEMENT ASSOC Groundwater | IL1975480 | 2 | 0 | Low Level |
| ROCKFORD, IL Groundwater | IL2010300 | 2 | 0 | Low Level |
| EISENHOWER ACADEMY Groundwater | IL3004572 | 2 | 0 | Low Level |
| MILL CREEK PWD Groundwater | IL0015300 | 1 | 0 | Low Level |
| BELVIDERE Groundwater | IL0070050 | 1 | 0 | Low Level |
| BUDA Groundwater | IL0110100 | 1 | 0 | Low Level |
| SPRING VALLEY Groundwater | IL0111000 | 1 | 0 | Low Level |
| CALHOUN COUNTY RWD Groundwater | IL0130010 | 1 | 0 | Low Level |
| IL AMERICAN-CHAMPAIGN Groundwater | IL0195300 | 1 | 0 | Low Level |
| PANA Surface Water | IL0210500 | 1 | 0 | Low Level |
| CHARLESTON Surface Water | IL0290100 | 1 | 0 | Low Level |
| MATTOON Surface Water | IL0290250 | 1 | 0 | Low Level |
| SUMMIT Surface Water | IL0310060 | 1 | 0 | Low Level |
| LEMONT Groundwater | IL0311620 | 1 | 0 | Low Level |
| MARKHAM Surface Water | IL0311770 | 1 | 0 | Low Level |
| OAK FOREST Surface Water | IL0312190 | 1 | 0 | Low Level |
| RICHTON PARK Groundwater | IL0312550 | 1 | 0 | Low Level |
| SAUK Groundwater | IL0312790 | 1 | 0 | Low Level |
| SOUTH HOLLAND Surface Water | IL0312970 | 1 | 0 | Low Level |
| WESTERN SPRINGS Groundwater | IL0313180 | 1 | 0 | Low Level |
| PARK FOREST Groundwater | IL0314740 | 1 | 0 | Low Level |
| STEGER Groundwater | IL0314860 | 1 | 0 | Low Level |
| CORTLAND Groundwater | IL0370051 | 1 | 0 | Low Level |
| DE KALB Groundwater | IL0370100 | 1 | 0 | Low Level |
| SYCAMORE Groundwater | IL0370550 | 1 | 0 | Low Level |
| CAROL STREAM Surface Water | IL0430200 | 1 | 0 | Low Level |
| ELMHURST Surface Water | IL0430350 | 1 | 0 | Low Level |
| WARRENVILLE Groundwater | IL0430833 | 1 | 0 | Low Level |
| WEST CHICAGO Groundwater | IL0430900 | 1 | 0 | Low Level |
| Prairie Path Water Co. - Clarendon Groundwater | IL0435300 | 1 | 0 | Low Level |
| LAKE SARA AREA WATER CO-OP, INC. Surface Water | IL0495150 | 1 | 0 | Low Level |
| GIBSON CITY Groundwater | IL0530100 | 1 | 0 | Low Level |
| COAL CITY Groundwater | IL0630200 | 1 | 0 | Low Level |
| MORRIS, IL Groundwater | IL0630600 | 1 | 0 | Low Level |
| BOOKWALTER WOODS MHP Groundwater | IL0635125 | 1 | 0 | Low Level |
| SHADY OAKS MHP Groundwater | IL0635225 | 1 | 0 | Low Level |
| HAMILTON COUNTY WATER DISTRICT Surface Water | IL0651000 | 1 | 0 | Low Level |
| GENESEO Groundwater | IL0730500 | 1 | 0 | Low Level |
| KEWANEE Groundwater | IL0730650 | 1 | 0 | Low Level |
| ASHKUM Groundwater | IL0750050 | 1 | 0 | Low Level |
| MURPHYSBORO Surface Water | IL0770500 | 1 | 0 | Low Level |
| E J WATER COOP Groundwater | IL0790010 | 1 | 0 | Low Level |
| NORTHEAST MOUNT VERNON WATER COMPANY Surface Water | IL0810010 | 1 | 0 | Low Level |
| MOUNT VERNON Surface Water | IL0810300 | 1 | 0 | Low Level |
| WOODLAWN Surface Water | IL0810450 | 1 | 0 | Low Level |
| JERSEYVILLE Groundwater | IL0830250 | 1 | 0 | Low Level |
| WASCO SD Groundwater | IL0890110 | 1 | 0 | Low Level |
| MILL CREEK WATER RECLAMATION DISTRICT Groundwater | IL0890120 | 1 | 0 | Low Level |
| CARPENTERSVILLE Groundwater | IL0890200 | 1 | 0 | Low Level |
| ELBURN Groundwater | IL0890300 | 1 | 0 | Low Level |
| NORTH AURORA Groundwater | IL0890600 | 1 | 0 | Low Level |
| BATAVIA Groundwater | IL0894130 | 1 | 0 | Low Level |
| MONTGOMERY Groundwater | IL0894690 | 1 | 0 | Low Level |
| OSWEGO Groundwater | IL0930150 | 1 | 0 | Low Level |
| YORKVILLE Groundwater | IL0930250 | 1 | 0 | Low Level |
| ALTONA Groundwater | IL0950100 | 1 | 0 | Low Level |
| ANTIOCH Groundwater | IL0970050 | 1 | 0 | Low Level |
| HAINESVILLE Groundwater | IL0970400 | 1 | 0 | Low Level |
| LIBERTYVILLE Surface Water | IL0970900 | 1 | 0 | Low Level |
| ZION Surface Water | IL0972000 | 1 | 0 | Low Level |
| BARRINGTON Groundwater | IL0974080 | 1 | 0 | Low Level |
| ISLAND LAKE Groundwater | IL0974540 | 1 | 0 | Low Level |
| LCPW - PEKARA SUBDIVISION Groundwater | IL0975900 | 1 | 0 | Low Level |
| MARSEILLES Groundwater | IL0990500 | 1 | 0 | Low Level |
| MENDOTA Groundwater | IL0990550 | 1 | 0 | Low Level |
| OGLESBY Groundwater | IL0990700 | 1 | 0 | Low Level |
| OTTAWA Groundwater | IL0990800 | 1 | 0 | Low Level |
| PERU Groundwater | IL0990850 | 1 | 0 | Low Level |
| BUSHNELL Groundwater | IL1090150 | 1 | 0 | Low Level |
| MACOMB MX | IL1090350 | 1 | 0 | Low Level |
| WESTERN ILLINOIS UNIVERSITY Surface Water | IL1095510 | 1 | 0 | Low Level |
| LAKE IN THE HILLS Groundwater | IL1110400 | 1 | 0 | Low Level |
| MARENGO Groundwater | IL1110650 | 1 | 0 | Low Level |
| BLOOMINGTON, IL Surface Water | IL1130200 | 1 | 0 | Low Level |
| MOUNT ZION Surface Water | IL1150350 | 1 | 0 | Low Level |
| STAUNTON Surface Water | IL1171050 | 1 | 0 | Low Level |
| EDWARDSVILLE Groundwater | IL1190250 | 1 | 0 | Low Level |
| HIGHLAND Surface Water | IL1190550 | 1 | 0 | Low Level |
| FOUNTAIN WATER DISTRICT Groundwater | IL1330020 | 1 | 0 | Low Level |
| VALMEYER Groundwater | IL1330250 | 1 | 0 | Low Level |
| ALEXANDER WATER DISTRICT Surface Water | IL1370020 | 1 | 0 | Low Level |
| JACKSONVILLE MX | IL1370200 | 1 | 0 | Low Level |
| DUQUOIN Surface Water | IL1450100 | 1 | 0 | Low Level |
| RED BUD Groundwater | IL1570450 | 1 | 0 | Low Level |
| IL AMERICAN-ANDALUSIA Groundwater | IL1610050 | 1 | 0 | Low Level |
| MILAN Groundwater | IL1610400 | 1 | 0 | Low Level |
| MOLINE Surface Water | IL1610450 | 1 | 0 | Low Level |
| ROCK ISLAND Surface Water | IL1610650 | 1 | 0 | Low Level |
| SILVIS Groundwater | IL1610700 | 1 | 0 | Low Level |
| COAL VALLEY Groundwater | IL1614260 | 1 | 0 | Low Level |
| SALINE VALLEY CONSERVANCY DISTRICT Groundwater | IL1655300 | 1 | 0 | Low Level |
| SPRINGFIELD, IL Surface Water | IL1671200 | 1 | 0 | Low Level |
| CREVE COEUR Groundwater | IL1790100 | 1 | 0 | Low Level |
| MORTON Groundwater | IL1790500 | 1 | 0 | Low Level |
| ANNA Groundwater | IL1810050 | 1 | 0 | Low Level |
| HOOPESTON Groundwater | IL1830450 | 1 | 0 | Low Level |
| AQUA ILLINOIS-VERMILION COUNTY Surface Water | IL1835120 | 1 | 0 | Low Level |
| MONMOUTH Groundwater | IL1870150 | 1 | 0 | Low Level |
| WASHINGTON COUNTY WATER COMPANY Surface Water | IL1895600 | 1 | 0 | Low Level |
| MORRISON Groundwater | IL1950350 | 1 | 0 | Low Level |
| ROCK FALLS Groundwater | IL1950450 | 1 | 0 | Low Level |
| IL AMERICAN-STERLING Groundwater | IL1955040 | 1 | 0 | Low Level |
| BEECHER Groundwater | IL1970050 | 1 | 0 | Low Level |
| BRAIDWOOD Groundwater | IL1970150 | 1 | 0 | Low Level |
| CRETE Groundwater | IL1970300 | 1 | 0 | Low Level |
| FRANKFORT Groundwater | IL1970400 | 1 | 0 | Low Level |
| JOLIET Groundwater | IL1970450 | 1 | 0 | Low Level |
| MANHATTAN Groundwater | IL1970550 | 1 | 0 | Low Level |
| MONEE Groundwater | IL1970650 | 1 | 0 | Low Level |
| AQUA ILLINOIS-PEOTONE Groundwater | IL1970750 | 1 | 0 | Low Level |
| AQUA ILLINOIS-WILLOWBROOK Groundwater | IL1977870 | 1 | 0 | Low Level |
| CARTERVILLE Surface Water | IL1990150 | 1 | 0 | Low Level |
| HERRIN Surface Water | IL1990400 | 1 | 0 | Low Level |
| JOHNSTON CITY Surface Water | IL1990500 | 1 | 0 | Low Level |
| MARION Surface Water | IL1990550 | 1 | 0 | Low Level |
| CORINTH PWD Surface Water | IL1995120 | 1 | 0 | Low Level |
| IL AMERICAN-SOUTH BELOIT Groundwater | IL2010450 | 1 | 0 | Low Level |
| LOW POINT WATER DISTRICT Groundwater | IL2035100 | 1 | 0 | Low Level |
| SHERRARD JR/SR HIGH SCHOOL Groundwater | IL3090290 | 1 | 0 | Low Level |
Click any row to see ZIP-level details. Click PWSID to see the full utility page.
Test your water
EPA UCMR 5 tested 199 public water systems in Illinois — but at the utility entry point, not your tap. Aging pipes and indoor plumbing can change what reaches your home, and private wells aren't covered by UCMR 5 at all. To find out what's actually in your water, test it with a certified lab.
How PFAS water testing works
EPA Method 537.1 in plain English — what a certified lab actually measures
Order a certified mail-in test kit
PFAS mail-in kits from about $85 (Cyclopure, Tap Score)
On a private well in Illinois?
Wells aren't covered by EPA testing — your own testing guide
Illinois testing resources
Own state limitsCompiled from official Illinois state sources. Programs and eligibility change — confirm current details with the agency.
