Illinois PFAS compliance
PFAS contamination data for 500 water systems in Illinois, serving 18,130,168 people.
Total systems
500
Exceed MCL
19
At risk
0
Compliant
310
Settlement eligible
134
Illinois PFAS regulatory overview
State standards
State standardsIllinois has its own PFAS standards
PFOA MCL: 2 ppt(EPA: 4 ppt)
PFOS MCL: 6 ppt(EPA: 4 ppt)
IL health-based guidance levels: PFOA 2 ppt, PFOS 6 ppt, PFBS 2100 ppt, PFHxS 140 ppt, PFNA 21 ppt, GenX 12 ppt. New 2026 PFAS regulations taking effect.
Regulatory agency
Illinois has health-based guidance levels for PFAS. Some among the strictest in the nation (PFOA 2 ppt). New 2026 regulations strengthen state PFAS framework. Contamination around military installations.
Get weekly PFAS compliance alerts for Illinois
Water systems
| System | City | Population | PFOA (ppt) | PFOS (ppt) | Status |
|---|---|---|---|---|---|
| CHICAGO IL0316000 | CHICAGO | 2,746,388 | — | — | Compliant |
| AURORA IL0894070 | AURORA | 183,000 | — | — | Compliant |
| JOLIET IL1970450 | JOLIET | 160,000 | — | — | Compliant |
| NAPERVILLE IL0434670 | NAPERVILLE | 156,406 | — | — | Compliant |
| IL AMERICAN-CHAMPAIGN IL0195300 | GODFREY | 150,000 | — | — | Compliant |
| ROCKFORD IL2010300 | ROCKFORD | 147,051 | — | — | Compliant |
| IL AMERICAN-PEORIA IL1435030 | GODFREY | 137,575 | — | 6.5 | Exceeds |
| IL AMERICAN-EAST ST LOUIS IL1635040 | GODFREY | 131,368 | — | — | Compliant |
| SPRINGFIELD IL1671200 | SPRINGFIELD | 117,444 | — | — | Compliant |
| ELGIN IL0894380 | ELGIN | 114,797 | — | — | Compliant |
| WAUKEGAN IL0971900 | WAUKEGAN | 87,149 | — | — | Compliant |
| CICERO IL0310510 | CICERO | 83,000 | — | — | Compliant |
| AQUA ILLINOIS-KANKAKEE IL0915030 | KANKAKEE | 80,000 | — | — | Compliant |
| BLOOMINGTON IL1130200 | BLOOMINGTON | 77,610 | — | — | Compliant |
| DECATUR IL1150150 | DECATUR | 76,122 | — | — | Compliant |
| SCHAUMBURG IL0314890 | SCHAUMBURG | 75,750 | — | — | Compliant |
| EVANSTON IL0310810 | EVANSTON | 74,486 | — | — | Compliant |
| IL AMERICAN-WEST SUBURBAN IL1974151 | GODFREY | 73,978 | — | — | Compliant |
| ARLINGTON HEIGHTS IL0314030 | ARLINGTON HEIGHTS | 73,320 | — | — | Compliant |
| PALATINE IL0312340 | PALATINE | 70,875 | — | — | Compliant |
| SKOKIE IL0312880 | SKOKIE | 66,422 | — | — | Compliant |
| DES PLAINES IL0310630 | DES PLAINES | 60,675 | — | — | Compliant |
| ORLAND PARK IL0312310 | ORLAND PARK | 58,862 | — | — | Compliant |
| OAK LAWN IL0312220 | OAK LAWN | 58,362 | — | — | Compliant |
| BERWYN IL0310210 | BERWYN | 57,250 | — | — | Compliant |
| TINLEY PARK IL0314910 | TINLEY PARK | 56,703 | — | — | Compliant |
| OAK PARK IL0312250 | OAK PARK | 54,583 | — | — | Compliant |
| WHEATON IL0431050 | WHEATON | 53,970 | — | — | Compliant |
| NORMAL IL1130900 | NORMAL | 52,736 | — | — | Compliant |
| ROMEOVILLE IL1970900 | ROMEOVILLE | 50,458 | — | — | Compliant |
| HOFFMAN ESTATES IL0311290 | HOFFMAN ESTATES | 50,179 | — | — | Compliant |
| PLAINFIELD IL1970800 | PLAINFIELD | 50,000 | — | — | Compliant |
| DOWNERS GROVE IL0430300 | DOWNERS GROVE | 49,425 | — | — | Compliant |
| GLENVIEW IL0311020 | GLENVIEW | 47,856 | — | — | Compliant |
| O FALLON IL1631100 | O'FALLON | 46,603 | — | — | Compliant |
| IL AMERICAN-ALTON IL1195150 | GODFREY | 46,127 | — | — | Compliant |
| DEKALB IL0370100 | DEKALB | 45,000 | — | — | Compliant |
| ELMHURST IL0430350 | ELMHURST | 45,000 | — | — | Compliant |
| MOLINE IL1610450 | MOLINE | 44,500 | — | — | Compliant |
| LOMBARD IL0430600 | LOMBARD | 44,476 | — | — | Compliant |
| BUFFALO GROVE IL0314180 | BUFFALO GROVE | 43,212 | — | — | Compliant |
| QUINCY IL0010650 | QUINCY | 42,000 | — | — | Compliant |
| BARTLETT IL0314120 | BARTLETT | 41,500 | — | — | Compliant |
| MOUNT PROSPECT IL0311980 | MOUNT PROSPECT | 41,000 | — | — | Compliant |
| CRYSTAL LAKE IL1110150 | CRYSTAL LAKE | 40,661 | — | — | Compliant |
| CAROL STREAM IL0430200 | CAROL STREAM | 39,854 | — | — | Compliant |
| PARK RIDGE IL0312460 | PARK RIDGE | 39,800 | — | — | Compliant |
| WHEELING IL0314970 | WHEELING | 39,725 | — | — | Compliant |
| STREAMWOOD IL0313060 | STREAMWOOD | 39,577 | — | — | Compliant |
| ROCK ISLAND IL1610650 | ROCK ISLAND | 39,018 | — | — | Compliant |
| OSWEGO IL0930150 | OSWEGO | 38,169 | — | — | Compliant |
| ADDISON IL0430050 | ADDISON | 38,017 | — | — | Compliant |
| CARPENTERSVILLE IL0890200 | CARPENTERSVILLE | 37,983 | — | — | Compliant |
| HANOVER PARK IL0314480 | HANOVER PARK | 37,470 | — | — | Compliant |
| CALUMET CITY IL0310390 | CALUMET CITY | 37,000 | — | — | Compliant |
| NORTH PARK PWD IL2015500 | MACHESNEY PARK | 35,580 | 6.2 | 7.3 | Exceeds |
| ELK GROVE VILLAGE IL0314400 | ELK GROVE VILLAGE | 34,700 | — | — | Compliant |
| NORTHBROOK IL0312070 | NORTHBROOK | 34,407 | — | — | Compliant |
| WOODRIDGE IL0431250 | WOODRIDGE | 33,566 | — | — | Compliant |
| VERNON HILLS - LAKE CO PW IL0971750 | LIBERTYVILLE | 33,207 | — | — | Compliant |
| GLENDALE HEIGHTS IL0430400 | GLENDALE HEIGHTS | 33,176 | — | — | Compliant |
| ST CHARLES IL0894830 | ST. CHARLES | 33,103 | — | — | Compliant |
| IL AMERICAN-PEKIN IL1795040 | GODFREY | 31,731 | — | 4.4 | Exceeds |
| GALESBURG IL0950200 | GALESBURG | 31,620 | 14 | 4.2 | Exceeds |
| MUNDELEIN IL0971150 | MUNDELEIN | 31,500 | — | — | Compliant |
| ALGONQUIN IL1110050 | ALGONQUIN | 30,700 | — | — | Compliant |
| GURNEE IL0970350 | GURNEE | 30,193 | — | — | Compliant |
| HIGHLAND PARK IL0970500 | HIGHLAND PARK | 30,176 | — | — | Compliant |
| AQUA ILLINOIS-VERMILION COUNTY IL1835120 | KANKAKEE | 30,106 | — | — | Compliant |
| AQUA ILLINOIS-NORTH MAINE UTILITIES IL0315350 | KANKAKEE | 30,043 | — | — | Compliant |
| SOUTH STICKNY SD IL0317370 | BURBANK | 30,000 | — | — | Compliant |
| EJ WATER COOPERATIVE IL0790010 | DIETERICH | 29,720 | — | — | Compliant |
| COLLINSVILLE IL1194280 | COLLINSVILLE | 29,500 | 18 | 8.9 | Exceeds |
| NILES IL0312010 | NILES | 29,350 | — | — | Compliant |
| LANSING IL0311590 | LANSING | 29,076 | — | — | Compliant |
| MONTGOMERY IL0894690 | MONTGOMERY | 28,956 | — | — | Compliant |
| GLEN ELLYN IL0430450 | GLEN ELLYN | 28,850 | — | — | Compliant |
| LAKE IN THE HILLS IL1110400 | LAKE IN THE HILLS | 28,661 | — | — | Compliant |
| HUNTLEY IL1110350 | HUNTLEY | 28,495 | — | — | Compliant |
| NEW LENOX IL1970700 | NEW LENOX | 27,690 | — | — | Compliant |
| IL AMERICAN-GRANITE CITY IL1195030 | GODFREY | 27,549 | — | — | Compliant |
| OAK FOREST IL0312190 | OAK FOREST | 27,478 | — | — | Compliant |
| ROUND LAKE BEACH IL0971550 | ROUND LAKE BEACH | 27,200 | — | — | Compliant |
| WILMETTE IL0313300 | WILMETTE | 27,087 | — | — | Compliant |
| EDWARDSVILLE IL1190250 | EDWARDSVILLE | 26,808 | — | — | Compliant |
| CHICAGO HEIGHTS IL0310450 | CHICAGO HEIGHTS | 26,184 | — | — | Compliant |
| BATAVIA IL0894130 | BATAVIA | 26,098 | — | — | Compliant |
| WOODSTOCK IL1110950 | WOODSTOCK | 25,630 | — | — | Compliant |
| MORTON GROVE IL0311950 | MORTON GROVE | 25,297 | — | — | Compliant |
| WEST CHICAGO IL0430900 | WEST CHICAGO | 25,166 | — | — | Compliant |
| BELVIDERE IL0070050 | BELVIDERE | 25,070 | — | — | Compliant |
| HARVEY IL0311110 | HARVEY | 25,000 | — | — | Compliant |
| ELMWOOD PARK IL0310780 | ELMWOOD PARK | 25,000 | — | — | Compliant |
| IL AMERICAN-HOMER TOWNSHIP IL1970100 | GODFREY | 24,543 | — | — | Compliant |
| ZION IL0972000 | ZION | 24,442 | — | — | Compliant |
| LISLE IL0430551 | LISLE | 24,233 | — | — | Compliant |
| MELROSE PARK IL0311860 | MELROSE PARK | 24,206 | — | — | Compliant |
| WESTMONT IL0430950 | WESTMONT | 24,161 | — | — | Compliant |
| MAYWOOD IL0311830 | MAYWOOD | 24,090 | — | — | Compliant |
| FRANKFORT IL1970400 | FRANKFORT | 24,000 | — | — | Compliant |
| FREEPORT IL1770200 | FREEPORT | 23,930 | — | 14 | Exceeds |
| SOUTH ELGIN IL0890800 | SOUTH ELGIN | 23,648 | 5.7 | — | Exceeds |
| LOVES PARK IL2010150 | LOVES PARK | 23,335 | — | — | Compliant |
| ROLLING MEADOWS IL0312730 | ROLLING MEADOWS | 23,329 | — | — | Compliant |
| LOCKPORT IL1970500 | LOCKPORT | 23,100 | — | — | Compliant |
| YORKVILLE IL0930250 | YORKVILLE | 23,000 | — | — | Compliant |
| GREAT LAKES NAVAL TRAINING STATION IL0975227 | GREAT LAKES | 23,000 | — | — | Compliant |
| ROSELLE IL0434820 | ROSELLE | 22,897 | — | — | Compliant |
| MCHENRY IL1110600 | MCHENRY | 22,335 | — | — | Compliant |
| EAST PEORIA IL1790200 | EAST PEORIA | 22,284 | — | 4.2 | Exceeds |
| VILLA PARK IL0430800 | VILLA PARK | 22,263 | — | — | Compliant |
| CARBONDALE IL0770150 | CARBONDALE | 22,107 | — | — | Compliant |
| BLOOMINGDALE IL0430100 | BLOOMINGDALE | 22,018 | — | — | Compliant |
| SOUTH HOLLAND IL0312970 | SOUTH HOLLAND | 22,000 | — | — | Compliant |
| PARK FOREST IL0314740 | PARK FOREST | 21,975 | — | — | Compliant |
| DARIEN IL0430270 | DARIEN | 21,751 | — | — | Compliant |
| BLUE ISLAND IL0310240 | BLUE ISLAND | 21,494 | — | — | Compliant |
| EAST MOLINE IL1610250 | EAST MOLINE | 21,374 | — | — | Compliant |
| GRAYSLAKE IL0970250 | GRAYSLAKE | 21,248 | — | — | Compliant |
| GENEVA IL0890350 | GENEVA | 21,247 | — | — | Compliant |
| CREST HILL IL1970250 | CREST HILL | 21,169 | 13.7 | — | Exceeds |
| DOLTON IL0310690 | DOLTON | 20,510 | — | — | Compliant |
| LIBERTYVILLE IL0970900 | LIBERTYVILLE | 20,500 | — | — | Compliant |
| EVERGREEN PARK IL0310840 | EVERGREEN PARK | 19,943 | — | — | Compliant |
| JACKSONVILLE IL1370200 | JACKSONVILLE | 19,903 | — | — | Compliant |
| MOKENA IL1970600 | MOKENA | 19,887 | — | — | Compliant |
| LAKE ZURICH IL0970850 | LAKE ZURICH | 19,759 | — | — | Compliant |
| LAKE FOREST IL0970800 | LAKE FOREST | 19,642 | — | — | Compliant |
| MATTOON IL0290250 | MATTOON | 19,500 | — | — | Compliant |
| HOMEWOOD IL0311350 | HOMEWOOD | 19,463 | 4.3 | — | Exceeds |
| DEERFIELD IL0974340 | DEERFIELD | 19,196 | — | — | Compliant |
| BELLWOOD IL0310150 | BELLWOOD | 19,156 | — | — | Compliant |
| ALSIP IL0310030 | ALSIP | 19,063 | — | — | Compliant |
| IL AMERICAN-STREATOR IL0995030 | GODFREY | 19,000 | — | — | Compliant |
| BROOKFIELD IL0310330 | BROOKFIELD | 18,776 | — | — | Compliant |
| SHOREWOOD IL1975080 | SHOREWOOD | 18,645 | — | — | Compliant |
| BENSENVILLE IL0434140 | BENSENVILLE | 18,537 | — | — | Compliant |
| PALOS HILLS IL0312400 | PALOS HILLS | 18,530 | — | — | Compliant |
| SYCAMORE IL0370550 | SYCAMORE | 18,500 | — | — | Compliant |
| FRANKLIN PARK IL0310960 | FRANKLIN PARK | 18,467 | — | — | Compliant |
| JUSTICE-WILLOW SPRINGS WATER COMMISSION IL0315820 | JUSTICE | 18,457 | — | — | Compliant |
| ROUND LAKE IL0971500 | ROUND LAKE | 18,430 | — | — | Compliant |
| NORTH AURORA IL0890600 | NORTH AURORA | 18,350 | — | — | Compliant |
| MATTESON IL0311800 | MATTESON | 18,293 | — | — | Compliant |
| OTTAWA IL0990800 | OTTAWA | 18,097 | — | — | Compliant |
| HINSDALE IL0434520 | HINSDALE | 17,900 | — | — | Compliant |
| CARY IL1110100 | CARY | 17,826 | — | — | Compliant |
| LEMONT IL0311620 | LEMONT | 17,500 | — | — | Compliant |
| CHARLESTON IL0290100 | CHARLESTON | 17,286 | — | — | Compliant |
| MORTON IL1790500 | MORTON | 17,111 | — | — | Compliant |
| TROY IL1191000 | TROY | 16,962 | — | — | Compliant |
| MARION IL1990550 | MARION | 16,855 | — | — | Compliant |
| NORTH CHICAGO IL0971250 | NORTH CHICAGO | 16,813 | — | — | Compliant |
| CANTON IL0570250 | CANTON | 16,748 | — | — | Compliant |
| COUNTRY CLUB HILLS IL0310540 | COUNTRY CLUB HILLS | 16,500 | — | — | Compliant |
| BRIDGEVIEW IL0310270 | BRIDGEVIEW | 16,467 | — | — | Compliant |
| CHATHAM IL1670300 | CHATHAM | 16,423 | — | — | Compliant |
| WESTCHESTER IL0313150 | WESTCHESTER | 16,241 | — | — | Compliant |
| LA GRANGE IL0311530 | LA GRANGE | 16,200 | — | — | Compliant |
| MOUNT VERNON IL0810300 | MOUNT VERNON | 15,793 | — | — | Compliant |
| PALOS HEIGHTS IL0312370 | PALOS HEIGHTS | 15,500 | — | — | Compliant |
| NORRIDGE IL0312040 | NORRIDGE | 15,251 | — | — | Compliant |
| CAHOKIA HEIGHTS IL1635000 | CAHOKIA HEIGHTS | 15,250 | — | — | Compliant |
| BETHALTO IL1190150 | BETHALTO | 15,210 | — | — | Compliant |
| IL AMERICAN-LINCOLN IL1075030 | GODFREY | 15,200 | 5.7 | — | Exceeds |
| DIXON IL1030200 | DIXON | 15,096 | — | — | Compliant |
| MACOMB IL1090350 | MACOMB | 15,052 | — | — | Compliant |
| WILDWOOD SUBDIVISION - LAKE CO PW IL0977350 | LIBERTYVILLE | 14,832 | — | — | Compliant |
| MIDLOTHIAN IL0311920 | MIDLOTHIAN | 14,819 | — | — | Compliant |
| WASHINGTON IL1790750 | WASHINGTON | 14,793 | — | — | Compliant |
| IL AMERICAN-STERLING IL1955040 | GODFREY | 14,782 | — | — | Compliant |
| MORRIS IL0630600 | MORRIS | 14,775 | — | — | Compliant |
| HICKORY HILLS IL0311200 | HICKORY HILLS | 14,505 | — | — | Compliant |
| LINDENHURST IL0971000 | LINDENHURST | 14,500 | — | — | Compliant |
| FOREST PARK IL0310900 | FOREST PARK | 14,340 | — | — | Compliant |
| ANTIOCH IL0970050 | ANTIOCH | 14,175 | — | — | Compliant |
| CHICAGO RIDGE IL0310480 | CHICAGO RIDGE | 14,130 | — | — | Compliant |
| WAUCONDA IL0971850 | WAUCONDA | 14,084 | — | — | Compliant |
| WOOD DALE IL0431200 | WOOD DALE | 14,012 | — | — | Compliant |
| CASEYVILLE IL1630250 | CASEYVILLE | 13,798 | — | — | Compliant |
| LINCOLNWOOD IL0311650 | LINCOLONWOOD | 13,463 | — | — | Compliant |
| CHANNAHON IL1970200 | CHANNAHON | 13,380 | 4.6 | 5.9 | Exceeds |
| WESTERN SPRINGS IL0313180 | WESTERN SPRINGS | 13,274 | — | — | Compliant |
| HAZEL CREST IL0311170 | HAZEL CREST | 13,098 | — | — | Compliant |
| LA GRANGE PARK IL0311560 | LAGRANGE PARK | 13,011 | — | — | Compliant |
| U OF I-CHAMPAIGN IL0195500 | CHAMPAIGN | 13,000 | — | — | Compliant |
| RANTOUL IL0190650 | RANTOUL | 13,000 | — | — | Compliant |
| NORTHLAKE IL0314710 | NORTH LAKE | 12,840 | — | — | Compliant |
| TAYLORVILLE IL0210600 | TAYLORVILLE | 12,806 | — | — | Compliant |
| MINOOKA IL0630550 | MINOOKA | 12,800 | — | — | Compliant |
| JERSEY RWC IL0835300 | JERSEYVILLE | 12,750 | — | — | Compliant |
| HERRIN IL1990400 | HERRIN | 12,747 | — | — | Compliant |
| GLEN CARBON IL1190300 | GLEN CARBON | 12,618 | — | — | Compliant |
| PLANO IL0930200 | PLANO | 12,600 | — | — | Compliant |
| KEWANEE IL0730650 | KEWANEE | 12,509 | — | — | Compliant |
| RICHTON PARK IL0312550 | RICHTON PARK | 12,504 | — | — | Compliant |
| MARKHAM IL0311770 | MARKHAM | 12,500 | — | — | Compliant |
| WINNETKA IL0313330 | DEERFIELD | 12,475 | — | — | Compliant |
| WARRENVILLE IL0430833 | WARRENVILLE | 12,350 | — | — | Compliant |
| EFFINGHAM IL0490250 | EFFINGHAM | 12,252 | — | — | Compliant |
| CENTRALIA IL1214220 | CENTRALIA | 12,182 | — | — | Compliant |
| CAPTAIN JAMES A LOVELL FHCC IL3161232 | NORTH CHICAGO | 12,100 | — | — | Compliant |
| IL AMERICAN-PONTIAC IL1055030 | GODFREY | 11,864 | — | — | Compliant |
| FOX LAKE IL0970200 | INGLESIDE | 11,780 | — | 5 | Exceeds |
| RIVER FOREST IL0312610 | RIVER FOREST | 11,717 | — | — | Compliant |
| SCHILLER PARK IL0312850 | SCHILLER PARK | 11,709 | — | — | Compliant |
| WASHINGTON COUNTY WATER COMPANY IL1895600 | NASHVILLE | 11,374 | — | — | Compliant |
| LAKE OF EGYPT PWD IL1995200 | MARION | 11,368 | — | — | Compliant |
| ROBINSON-PALESTINE WATER COMMISSION IL0335030 | ROBINSON | 11,331 | — | 4.6 | Exceeds |
| SUGAR GROVE IL0890850 | SUGAR GROVE | 11,243 | — | — | Compliant |
| BURR RIDGE IL0434190 | BURR RIDGE | 11,192 | — | — | Compliant |
| IL AMERICAN-CHICAGO SUBURBAN IL0315150 | GODFREY | 11,187 | — | — | Compliant |
| COLUMBIA IL1330050 | COLUMBIA | 11,129 | — | — | Compliant |
| WORTH IL0313360 | WORTH | 10,970 | — | — | Compliant |
| SUMMIT IL0310060 | SUMMIT | 10,875 | — | — | Compliant |
| CRESTWOOD IL0310600 | CRESTWOOD | 10,826 | — | — | Compliant |
| HIGHLAND IL1190550 | HIGHLAND | 10,649 | — | — | Compliant |
| WOOD RIVER IL1191150 | WOOD RIVER | 10,464 | — | — | Compliant |
| PINGREE GROVE IL0890160 | PINGREE GROVE | 10,365 | — | — | Compliant |
| MANHATTAN IL1970550 | MANHATTAN | 10,340 | — | — | Compliant |
| BARRINGTON IL0974080 | BARRINGTON | 10,327 | — | — | Compliant |
| LYONS IL0311710 | LYONS | 10,304 | — | — | Compliant |
| PERU IL0990850 | PERU | 10,300 | — | — | Compliant |
| RIVER GROVE IL0312640 | RIVER GROVE | 10,282 | — | — | Compliant |
| RIVERDALE IL0312580 | RIVERDALE | 10,266 | — | — | Compliant |
| MURPHYSBORO IL0770500 | MURPHYSBORO | 10,241 | — | — | Compliant |
| WATERLOO IL1330300 | WATERLOO | 10,190 | — | — | Compliant |
| MARYVILLE IL1190750 | MARYVILLE | 10,150 | — | — | Compliant |
| LEYDEN TWSP WATER DISTRICT IL0315880 | FRANKLIN PARK | 10,000 | — | — | Compliant |
| ADVOCATE CHRIST MEDICAL CENTER IL3162461 | LIBERTYVILLE | 10,000 | — | — | Compliant |
| SAUK IL0312790 | SAUK VILLAGE | 9,921 | — | — | Compliant |
| WINFIELD IL0431150 | WINFIELD | 9,835 | — | — | Compliant |
| LA SALLE IL0990300 | LA SALLE | 9,700 | — | — | Compliant |
| STEGER IL0314860 | MANTENO | 9,700 | — | — | Compliant |
| ITASCA IL0430500 | ITASCA | 9,506 | — | — | Compliant |
| HARVARD IL1110250 | HARVARD | 9,469 | — | — | Compliant |
| ROCHELLE IL1410500 | ROCHELLE | 9,446 | — | — | Compliant |
| OAK BROOK IL0430700 | OAK BROOK | 9,400 | — | — | Compliant |
| FLOSSMOOR IL0310870 | FLOSSMOOR | 9,371 | — | — | Compliant |
| RIVERSIDE IL0312670 | RIVERSIDE | 9,298 | — | — | Compliant |
| LYNWOOD IL0311680 | LYNWOOD | 9,149 | — | — | Compliant |
| PARIS IL0450300 | PARIS | 9,100 | — | — | Compliant |
| HARWOOD HEIGHTS IL0311140 | HARDWOOD HEIGHTS | 9,065 | — | — | Compliant |
| WILLOWBROOK IL0431100 | WILLOWBROOK | 9,000 | — | — | Compliant |
| GLENWOOD IL0311050 | GLENWOOD | 8,956 | — | — | Compliant |
| MONMOUTH IL1870150 | MONMOUTH | 8,902 | — | — | Compliant |
| CLEAR WATER SERVICE CORP IL0295100 | MATTOON | 8,900 | — | — | Compliant |
| OLNEY IL1590200 | OLNEY | 8,877 | — | — | Compliant |
| GLENCOE IL0310990 | GLENCOE | 8,849 | — | — | Compliant |
| LAKE VILLA IL0970840 | LAKE VILLA | 8,829 | — | — | Compliant |
| MASCOUTAH IL1630800 | MASCOUTAH | 8,759 | — | — | Compliant |
| IL AMERICAN-JERSEYVILLE IL0830250 | GODFREY | 8,737 | — | — | Compliant |
| BEACH PARK IL0970190 | BEACH PARK | 8,710 | — | — | Compliant |
| CLARENDON HILLS IL0430250 | CLARENDON HILLS | 8,702 | — | — | Compliant |
| WEST FRANKFORT IL0550700 | WEST FRANKFORT | 8,650 | — | — | Compliant |
| ROCK FALLS IL1950450 | ROCK FALLS | 8,620 | — | — | Compliant |
| HARRISBURG IL1650200 | HARRISBURG | 8,524 | — | — | Compliant |
| CALUMET PARK IL0310420 | CALUMET PARK | 8,442 | — | — | Compliant |
| CHESTER IL1570100 | CHESTER | 8,407 | — | — | Compliant |
| GILBERTS IL0890400 | GILBERTS | 8,366 | — | — | Compliant |
| GREENVILLE IL0050050 | GREENVILLE | 8,310 | — | — | Compliant |
| PRAIRIE PATH WATER CO-WHISPERING HILLS IL1115700 | MCHENRY | 8,300 | 8.3 | — | Exceeds |
| NORTH TAZEWELL PWD IL1795780 | EAST PEORIA | 8,300 | — | — | Compliant |
| CRETE IL1970300 | CRETE | 8,275 | — | — | Compliant |
| HILLSIDE IL0311230 | HILLSIDE | 8,200 | — | — | Compliant |
| BENTON IL0550050 | BENTON | 8,104 | — | — | Compliant |
| ISLAND LAKE IL0974540 | ISLAND LAKE | 8,066 | — | — | Compliant |
| WESTERN ILLINOIS UNIVERSITY IL1095510 | MACOMB | 8,000 | — | — | Compliant |
| MILL CREEK WATER RECLAMATION DISTRICT IL0890120 | GENEVA | 8,000 | — | — | Compliant |
| LINCOLNSHIRE IL0970950 | LINCOLNSHIRE | 7,940 | — | — | Compliant |
| FOSTERBURG PWD IL1195220 | ALTON | 7,940 | — | — | Compliant |
| SALEM IL1210450 | SALEM | 7,905 | — | — | Compliant |
| IL AMERICAN-SOUTH BELOIT IL2010450 | GODFREY | 7,893 | — | — | Compliant |
| LONG CREEK TOWNSHIP PWS IL1155150 | DECATUR | 7,850 | — | — | Compliant |
| BROADVIEW IL0310300 | BROADVIEW | 7,847 | — | — | Compliant |
| WEST DUNDEE IL0890950 | WEST DUNDEE | 7,845 | — | — | Compliant |
| PRINCETON IL0110850 | PRINCETON | 7,832 | — | — | Compliant |
| ROCK ISLAND ARSENAL, US ARMY IL1615387 | ROCK ISLAND | 7,800 | 4.6 | — | Exceeds |
| HAMPSHIRE IL0890450 | HAMPSHIRE | 7,758 | — | — | Compliant |
| ROCKTON IL2010350 | ROCKTON | 7,685 | — | — | Exceeds |
| VANDALIA IL0510350 | VANDALIA | 7,616 | — | — | Compliant |
| MARENGO IL1110650 | MARENGO | 7,572 | — | — | Compliant |
| SILVIS IL1610700 | SILVIS | 7,473 | — | — | Compliant |
| DUQUOIN IL1450100 | DUQUOIN | 7,169 | — | — | Compliant |
| SANDWICH IL0374850 | SANDWICH | 7,156 | — | — | Compliant |
| CLINTON IL0390050 | CLINTON | 7,128 | — | — | Compliant |
| RACCOON WATER COMPANY IL1215100 | CENTRALIA | 7,080 | — | — | Compliant |
| NORTH RIVERSIDE IL0312160 | NORTH RIVERSIDE | 7,071 | — | — | Compliant |
| MOUNT CARMEL IL1850200 | MT CARMEL | 7,015 | — | 4.8 | Exceeds |
| AQUA ILLINOIS-UNIVERSITY PARK IL1975030 | KANKAKEE | 7,002 | — | — | Compliant |
| SOUTHEAST REGIONAL WATER FACILITY IL0430060 | DARIEN | 6,940 | — | — | Compliant |
| MENDOTA IL0990550 | MENDOTA | 6,926 | — | — | Compliant |
| STICKNEY IL0313000 | STICKNEY | 6,902 | — | — | Compliant |
| ABS WATER COOP IL0015350 | CLAYTON | 6,858 | — | — | Compliant |
| AMERICAN WATER OPER AND MAINTENANCE, LLC IL1635237 | SCOTT AIR FORCE BASE | 6,779 | — | — | Compliant |
| IL AMERICAN-VALLEY VIEW IL0437350 | GODFREY | 6,721 | 7.3 | — | Exceeds |
| CURRAN-GARDNER TOWNSHIP PWD IL1675350 | SPRINGFIELD | 6,651 | — | — | Compliant |
| LITCHFIELD IL1350400 | LITCHFIELD | 6,648 | — | — | Compliant |
| BOND/MADISON WATER COMPANY IL0050020 | POCAHONTAS | 6,645 | — | — | Compliant |
| VOLO IL0971770 | VOLO | 6,629 | — | — | Compliant |
| PRAIRIE PATH WATER COMPANY-LAKE HOLIDAY IL0995200 | ST. CHARLES | 6,601 | — | — | Compliant |
| ILLINOIS STATE UNIVERSITY-NORMAL IL1135510 | NORMAL | 6,600 | — | — | Compliant |
| LA GRANGE HIGHLANDS SANITARY DISTRICT IL0315860 | LAGRANGE | 6,600 | — | — | Compliant |
| CARLINVILLE IL1170150 | CARLINVILLE | 6,598 | — | — | Compliant |
| MAHOMET IL0190450 | MAHOMET | 6,580 | — | — | Compliant |
| WINTHROP HARBOR IL0971950 | WINTHROP HARBOR | 6,565 | — | — | Compliant |
| ELBURN IL0890300 | ELBURN | 6,559 | — | — | Compliant |
| GENESEO IL0730500 | GENESEO | 6,539 | — | — | Compliant |
| NORTHERN ILLINOIS UNIVERSITY-DEKALB IL0375500 | DEKALB | 6,500 | — | — | Compliant |
| CARTERVILLE IL1990150 | CARTERVILLE | 6,484 | — | — | Compliant |
| AQUA ILLINOIS-CANDLEWICK DVN IL0075050 | KANKAKEE | 6,426 | — | — | Compliant |
| COUNTRYSIDE IL0310570 | COUNTRYSIDE | 6,420 | — | — | Compliant |
| DALLAS RURAL WATER DISTRICT IL0710010 | HAMILTON | 6,370 | — | — | Compliant |
| METROPOLIS IL1270150 | METROPOLIS | 6,309 | — | — | Compliant |
| CARMI IL1930100 | CARMI | 6,307 | — | — | Compliant |
| NORTHSHORE UNIVERSITY EVANSTON IL3158048 | CHICAGO | 6,300 | — | — | Compliant |
| FORT MASSAC PWD IL1275050 | METROPOLIS | 6,290 | — | — | Compliant |
| FAIRFIELD IL1910100 | FAIRFIELD | 6,202 | — | — | Compliant |
| WILLIAMSVILLE IL1671300 | WILLIAMSVILLE | 6,198 | — | — | Compliant |
| BRAIDWOOD IL1970150 | BRAIDWOOD | 6,194 | — | — | Compliant |
| SHELBYVILLE IL1730300 | SHELBYVILLE | 6,174 | — | — | Compliant |
| CHILLICOTHE IL1430200 | CHILLICOTHE | 5,996 | — | — | Compliant |
| BEARDSTOWN IL0170150 | BEARDSTOWN | 5,951 | — | — | Compliant |
| PEORIA HEIGHTS IL1434750 | PEORIA HEIGHTS | 5,908 | — | — | Compliant |
| MOUNT ZION IL1150350 | MOUNT ZION | 5,833 | — | — | Compliant |
| PINCKNEYVILLE IL1450150 | PINCKNEYVILLE | 5,804 | — | — | Compliant |
| HOOPESTON IL1830450 | HOOPESTON | 5,802 | — | — | Compliant |
| CLARK-EDGAR RWD IL0230010 | MARSHALL | 5,801 | — | — | Compliant |
| PANA IL0210500 | PANA | 5,800 | — | — | Compliant |