PFAS contamination data for 25,912 water systems in Illinois, serving 19,764,887 people.
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.
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.
Serious SDWA violator: ASHLEY FARMS, Kendall, IL
PWS ID: IL3161166. County: Kendall
2026-05-11 · Read more →
Serious SDWA violator: BENTON, Benton, IL
PWS ID: IL0550050. County: Franklin
2026-05-11 · Read more →
Serious SDWA violator: ALLENS CORNER, Kane, IL
PWS ID: IL3009415. County: Kane
2026-05-11 · Read more →
Free eligibility check — plus weekly MCL, deadline, and funding alerts for Illinois.
| 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 |
PWS ID: IL3163402. County: Boone
2026-05-11 · Read more →
Serious SDWA violator: AURORA WEST FOREST PRESERVE, Kane, IL
PWS ID: IL3139485. County: Kane
2026-05-11 · Read more →
| 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 |
| ELMWOOD PARK IL0310780 | ELMWOOD PARK | 25,000 | — | — | Compliant |
| HARVEY IL0311110 | HARVEY | 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 |
| GREAT LAKES NAVAL TRAINING STATION IL0975227 | GREAT LAKES | 23,000 | — | — | Compliant |
| YORKVILLE IL0930250 | YORKVILLE | 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 |
| BOLINGBROOK IL1974150 | WOODRIDGE | 15,404 | — | — | 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 |
| IL AMERICAN-CHICKASAW IL1975320 | HOMER TWP | 12,432 | — | — | 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 |
| SHO-DEEN SBDV IL0890060 | BLACKBERRY TWP | 11,200 | — | — | Compliant |
| BURR RIDGE IL0434190 | BURR RIDGE | 11,192 | — | — | Compliant |
| IL AMERICAN-CHICAGO SUBURBAN IL0315150 | GODFREY | 11,187 | — | — | Compliant |
| COLUMBIA IL1330050 | COLUMBIA | 11,129 | — | — | Compliant |
| COMMONFIELDS OF CAHOKIA PWD IL1635030 | CAHOKIA | 11,030 | — | — | Compliant |
| WORTH IL0313360 | WORTH | 10,970 | — | — | Compliant |
| FRANKFORT E HICKORY CRK BASIN IL1977530 | FRANKFORT TWP | 10,900 | — | — | Compliant |
| SUMMIT IL0310060 | SUMMIT | 10,875 | — | — | Compliant |
| CRESTWOOD IL0310600 | CRESTWOOD | 10,826 | — | — | Compliant |
| HEBRON PWD IL0335150 | UNSPEC PL IN CO | 10,800 | — | — | 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 |
| STEGER IL0314860 | MANTENO | 9,700 | — | — | Compliant |
| LA SALLE IL0990300 | LA SALLE | 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 |
| BOLINGBROOK SYSTEM 2 IL1974152 | WOODRIDGE | 9,160 | — | — | 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 |
| LOYOLA UNIV MED CNTR IL0310160 | PROVISO TWP | 8,800 | — | — | 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 |
| FOSTERBURG PWD IL1195220 | ALTON | 7,940 | — | — | Compliant |
| LINCOLNSHIRE IL0970950 | LINCOLNSHIRE | 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 |
| IL AMERICAN-DUPAGE UTILITY IL0430552 | GODFREY | 6,613 | — | — | 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 |
| IL AMERICAN-DERBY MEADOWS IL1975510 | HOMER TWP | 6,438 | — | — | Compliant |
| AQUA ILLINOIS-CANDLEWICK DVN IL0075050 | KANKAKEE | 6,426 | — | — | Compliant |
| COUNTRYSIDE IL0310570 | COUNTRYSIDE | 6,420 | — | — | Compliant |
| MANTENO IL0910600 | MANTENO | 6,414 | — | — | Compliant |
| DALLAS RURAL WATER DISTRICT IL0710010 | HAMILTON | 6,370 | — | — | Compliant |
| SIU PROPERTIES VIA CARBONDALE IL0775450 | CARBONDALE TWP | 6,354 | — | — | 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 |
| FRANKFORT SQUARE SBDV IL1975270 | FRANKFORT TWP | 6,200 | — | — | Compliant |
| WILLIAMSVILLE IL1671300 | WILLIAMSVILLE | 6,198 | — | — | Compliant |
| BRAIDWOOD IL1970150 | BRAIDWOOD | 6,194 | — | — | Compliant |
| SHELBYVILLE IL1730300 | SHELBYVILLE | 6,174 | — | — | Compliant |
| LCPW-KNOLLWOOD PWS IL0975460 | LIBERTYVILLE | 6,078 | — | — | 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 |
| EAST ALTON IL1190200 | EAST ALTON | 5,786 | 16 | 17 | Exceeds |
| STAUNTON IL1171050 | STAUNTON | 5,756 | — | — | Compliant |
| MILL CREEK PWD IL0015300 | QUINCY | 5,755 | — | — | Compliant |
| GRANDWOOD PARK SUBDIVISION - LAKE CO PW IL0975600 | LIBERTYVILLE | 5,751 | — | — | Compliant |
| COAL CITY IL0630200 | COAL CITY | 5,749 | — | — | Compliant |
| WILMINGTON IL1971100 | WILMINGTON | 5,624 | — | — | Compliant |
| FAYETTE WATER COMPANY IL0510010 | BROWNSTOWN | 5,608 | — | — | Compliant |
| LAKE BLUFF IL0970750 | LAKE BLUFF | 5,600 | — | — | Compliant |
| SPRING VALLEY IL0111000 | SPRING VALLEY | 5,582 | — | — | Compliant |
| MILLSTONE PWD IL1515050 | NASHVILLE | 5,565 | — | — | Compliant |
| MONTICELLO IL1470350 | MONTICELLO | 5,548 | — | — | Compliant |
| ROSEWOOD TRACE SBDV IL0437080 | DOWNERS GR TWP | 5,500 | — | — | Compliant |
| WATSEKA IL0750900 | WATSEKA | 5,500 | — | — | Compliant |
| EASTERN ILLINOIS UNIVERSITY IL0295500 | CHARLESTON | 5,500 | — | — | Compliant |
| NORTHEAST MOUNT VERNON WATER COMPANY IL0810010 | MT VERNON | 5,483 | — | — | Compliant |
| NORTHFIELD IL0312100 | NORTHFIELD | 5,470 | — | — | Compliant |
| PARK CITY IL0971400 | PARK CITY | 5,425 | — | — | Compliant |
| ROBBINS IL0312700 | ROBBINS | 5,415 | — | — | Compliant |
| AQUA ILLINOIS-OAK BROOK IL0430055 | KANKAKEE | 5,361 | — | — | Compliant |
| HIGHWOOD IL0970550 | HIGHWOOD | 5,335 | — | — | Compliant |
| POSEN IL0312520 | POSEN | 5,331 | — | — | Compliant |
| PIKE COUNTY PWD 1 IL1495000 | PITTSFIELD | 5,327 | — | — | Compliant |
| SANGAMON VALLEY PWD IL0195150 | MAHOMET | 5,300 | — | — | Compliant |
| GENOA IL0370150 | GENOA | 5,298 | — | — | Compliant |
| MITCHELL PWD IL1195210 | GRANITE CITY | 5,253 | — | — | Compliant |
| FLORA IL0250100 | FLORA | 5,233 | — | — | Compliant |
| IL AMERICAN-FERNWAY IL0315030 | GODFREY | 5,223 | — | — | Compliant |
| EUREKA IL2030200 | EUREKA | 5,216 | — | — | Compliant |
| BERKELEY IL0310180 | BERKELEY | 5,214 | — | — | Compliant |
| MONEE IL1970650 | MONEE | 5,148 | — | — | Compliant |
| CATERPILLAR TRAIL PWD IL2035030 | EAST PEORIA | 5,125 | — | — | Compliant |
| AQUA ILLINOIS-WILLOWBROOK IL1977870 | KANKAKEE | 5,100 | — | — | Compliant |
| MARSEILLES IL0990500 | MARSEILLES | 5,061 | — | — | Compliant |
| BRIGHTON IL1174160 | BRIGHTON | 5,041 | — | — | Compliant |
| OTTER CREEK WATER RECLAIMATION DISTRICT IL0890090 | BURR RIDGE | 5,025 | — | — | Compliant |
| U OF I CHICAGO MEDICAL CENTER IL3155606 | CHICAGO | 5,000 | — | — | Compliant |
| BRADLEY IL0910200 | BRADLEY | 4,989 | — | — | Compliant |
| MURDALE PWD IL0775200 | MURPHYSBORO | 4,963 | — | — | Compliant |
| MILAN IL1610400 | MILAN | 4,945 | — | — | Compliant |
| CREVE COEUR IL1790100 | CREVE COEUR | 4,934 | — | — | Compliant |
| OLYMPIA FIELDS IL0312280 | OLYMPIA FIELDS | 4,922 | — | — | Compliant |
| ANNA IL1810050 | ANNA | 4,910 | — | — | Compliant |
| ROUND LAKE PARK IL0971600 | ROUND LAKE PARK | 4,900 | — | — | Compliant |
| TUSCOLA IL0415030 | TUSCOLA | 4,875 | — | — | Compliant |
| PALOS PARK IL0311000 | PALOS PARK | 4,873 | — | — | Compliant |
| WEST PRAIRIE WATER COMPANY IL0410030 | ARTHUR | 4,800 | — | — | Compliant |
| BREESE IL0270250 | BREESE | 4,772 | — | — | Compliant |
| BYRON IL1410100 | BYRON | 4,743 | — | — | Compliant |
| CHERRY VALLEY IL2010050 | CHERRY VALLEY | 4,731 | — | — | Compliant |
| SULLIVAN IL1390300 | SULLIVAN | 4,729 | — | — | Compliant |
| PETERSBURG IL1290200 | PETERSBURG | 4,725 | — | — | Compliant |
| ELDORADO IL1655030 | ELDORADO | 4,715 | — | — | Compliant |
| LEBANON IL1630650 | LEBANON | 4,714 | — | — | Compliant |
| BEECHER IL1970050 | BEECHER | 4,713 | — | — | Compliant |
| FREEBURG IL1630600 | FREEBURG | 4,707 | — | 7 | Exceeds |
| FOX RIVER GROVE IL1110200 | FOX RIVER GROVE | 4,702 | — | — | Compliant |
| PITTSFIELD IL1490750 | PITTSFIELD | 4,697 | — | — | Compliant |
| DUPO IL1630350 | DUPO | 4,684 | — | 5.6 | Exceeds |
| CALHOUN COUNTY RWD IL0130010 | HARDIN | 4,675 | — | — | Compliant |
| STONE PARK IL0313030 | WEST CHICAGO | 4,576 | — | — | Compliant |
| ATHENS IL1290050 | ATHENS | 4,575 | — | — | Compliant |
| AUBURN IL1670050 | AUBURN | 4,574 | — | — | Compliant |
| LAWRENCEVILLE IL1010150 | LAWRENCEVILLE | 4,524 | — | — | Compliant |
| SOUTH HIGHWAY PWD IL0775400 | MAKANDA | 4,501 | — | — | Compliant |
| PAXTON IL0530250 | PAXTON | 4,500 | — | — | Compliant |
| OGLESBY IL0990700 | OGLESBY | 4,500 | — | — | Compliant |
| HILLSBORO IL1350300 | HILLSBORO | 4,402 | — | — | Compliant |
| DWIGHT IL1050250 | DWIGHT | 4,400 | — | — | Compliant |
| SPARTA IL1570600 | SPARTA | 4,395 | — | — | Compliant |
| MARENGO ESTS SBDV IL1110020 | UNSPEC PL IN CO | 4,360 | — | — | Compliant |
| RIVERTON IL1670950 | RIVERTON | 4,279 | — | — | Compliant |
| CORTLAND IL0370051 | CORTLAND | 4,270 | — | — | Compliant |
| LAKEWOOD IL1115760 | LAKEWOOD | 4,267 | — | — | Compliant |
| HOMETOWN IL0311320 | HOMETOWN | 4,240 | — | — | Compliant |
| GEORGETOWN IL1830350 | GEORGETOWN | 4,200 | — | — | Compliant |
| MORRISON IL1950350 | MORRISON | 4,188 | — | — | Compliant |
| AQUA ILLINOIS-PEOTONE IL1970750 | KANKAKEE | 4,182 | — | — | Compliant |
| NEW BADEN IL0274700 | NEW BADEN | 4,178 | — | 9.4 | Exceeds |
| CAHOKIA IL1630200 | CAHOKIA | 4,150 | — | — | Compliant |
| WOODHAVEN IL1035100 | SUBLETTE | 4,100 | — | — | Compliant |
| MILLSTADT IL1630850 | SWANSEA | 4,071 | — | — | Compliant |
| SMITHTON IL1631300 | SMITHTON | 4,006 | — | — | Compliant |
| SHILOH IL1631250 | SHILOH | 4,000 | — | — | Compliant |
| WASCO SD IL0890110 | WASCO | 4,000 | — | — | Compliant |
| BURNHAM IL0310360 | BURNHAM | 3,989 | — | — | Compliant |
| NORTH EAST CENTRAL PWD IL1195280 | EDWARDSVILLE | 3,975 | 4.1 | 4.1 | Exceeds |
| COAL VALLEY PWD IL1995250 | MARION | 3,960 | — | — | Compliant |
| HAMILTON COUNTY WATER DISTRICT IL0651000 | MCLEANSBORO | 3,958 | — | — | Compliant |
| ROSEMONT IL0312760 | ROSEMONT | 3,952 | — | — | Compliant |
| MARSHALL IL0230100 | MARSHALL | 3,947 | — | — | Compliant |
| CORINTH PWD IL1995120 | PITTSBURG | 3,927 | — | — | Compliant |
| SOUTH CHICAGO HEIGHTS IL0312940 | SOUTH CHICAGO HEIGHTS | 3,924 | — | — | Compliant |
| SALINE VALLEY CONSERVANCY DISTRICT IL1655300 | ELDORADO | 3,921 | — | — | Compliant |
| WESTVILLE IL1830950 | WESTVILLE | 3,917 | — | — | Compliant |
| METAMORA IL2030350 | METAMORA | 3,895 | — | — | Compliant |
| WILLIAMSVILLE-SHERMAN WTR CMSN IL1670030 | UNSPEC PL IN CO | 3,890 | — | — | Compliant |
| COAL VALLEY IL1614260 | COAL VALLEY | 3,873 | — | — | Compliant |
| WONDER LAKE IL1115750 | WONDER LAKE | 3,870 | — | — | Compliant |
| ROCHESTER IL1671000 | ROCHESTER | 3,856 | — | — | Compliant |
| RED BUD IL1570450 | RED BUD | 3,804 | — | — | Compliant |
| GREENE COUNTY RWD IL0610020 | CARROLLTON | 3,786 | — | — | Compliant |
| PLEASANT VALLEY PWD IL1435470 | PEORIA | 3,783 | — | — | Exceeds |
| EMBARRAS AREA WATER DISTRICT IL0290020 | CHARLESTON | 3,750 | — | — | Compliant |
| GILLESPIE IL1170400 | GILLESPIE | 3,737 | — | — | Compliant |
| LCPW - PEKARA SUBDIVISION IL0975900 | LIBERTYVILLE | 3,711 | — | — | Compliant |
| HINSWOOD SBDV IL0435520 | DOWNERS GR TWP | 3,700 | — | — | Compliant |
| REND LAKE INTER-CITY WATER SYSTEM IL0555100 | BENTON | 3,650 | — | — | Compliant |
| FOUNTAIN WATER DISTRICT IL1330020 | VALMEYER | 3,650 | — | — | Compliant |
| FAIRBURY IL1050350 | FAIRBURY | 3,633 | — | — | Compliant |
| RIVERWOODS IL0971450 | VERNON HILLS | 3,618 | — | — | Compliant |
| IL AMERICAN-TOLONO IL0191000 | GODFREY | 3,604 | — | — | Compliant |
| FOX LAKE PLANT 2 IL0975780 | CARY | 3,600 | — | — | Compliant |
| WOODLAWN IL0810450 | WOODLAWN | 3,587 | — | — | Compliant |
| THREE COUNTY PWD IL1195450 | NEW DOUGLAS | 3,575 | — | — | Compliant |
| HAINESVILLE IL0970400 | VOLO | 3,528 | — | — | Compliant |
| WESTERN WAYNE WATER DISTRICT IL1910010 | WAYNE CITY | 3,516 | — | — | Compliant |
| JOHNSTON CITY IL1990500 | JOHNSTON CITY | 3,509 | — | — | Compliant |
| SOUTH JACKSONVILLE IL1370400 | SOUTH JACKSONVILLE | 3,508 | — | — | Compliant |
| GIBSON CITY IL0530100 | GIBSON CITY | 3,500 | — | — | Compliant |
| LE ROY IL1130750 | LEROY | 3,498 | — | — | Compliant |
| FORSYTH IL1150200 | FORSYTH | 3,490 | — | — | Compliant |
| TRITOWNSHIP WATER DISTRICT IL1190080 | TRENTON | 3,470 | — | — | Compliant |
| ALEDO IL1310050 | ALEDO | 3,470 | — | — | Compliant |
| OREGON IL1410400 | OREGON | 3,449 | — | — | Compliant |
| BEACH PARK NO.2 IL0971220 | BEACH PARK | 3,435 | — | — | Compliant |
| HARDINVILLE WATER COMPANY IL0330020 | ROBINSON | 3,403 | — | — | Compliant |
| LUTHERAN GENERAL HOSPITAL IL3154633 | LIBERTYVILLE | 3,400 | — | — | Compliant |
| MACKINAW IL1790350 | MACKINAW | 3,399 | — | — | Compliant |
| RUSHVILLE IL1690200 | EAST PEORIA | 3,375 | — | — | Compliant |
| CARLYLE IL0270300 | CARLYLE | 3,373 | — | — | Compliant |
| LAKE SARA AREA WATER CO-OP, INC. IL0495150 | EFFINGHAM | 3,352 | — | — | Compliant |
| FULTON IL1950250 | FULTON | 3,346 | — | — | Compliant |
| PONTOON BEACH PWD IL1195300 | GRANITE CITY | 3,325 | — | — | Compliant |
| GALENA IL0850200 | GALENA | 3,308 | — | — | Compliant |
| IL AMERICAN-LIBERTY RIDGE WEST IL0435650 | GODFREY | 3,307 | — | — | Compliant |
| ABINGDON IL0950050 | MONMOUTH | 3,275 | 9.4 | 4.8 | Exceeds |
| CASEY IL0230050 | CASEY | 3,274 | — | — | Compliant |
| VIRDEN IL1171100 | VIRDEN | 3,274 | — | — | Compliant |
| MOUNT STERLING IL0090100 | MT. STERLING | 3,271 | — | — | Compliant |
| INDIAN HEAD PARK IL0311410 | INDIAN HEAD PARK | 3,240 | — | — | Compliant |
| NASHVILLE IL1890300 | NASHVILLE | 3,230 | — | — | Compliant |
| NORTH EAST MARION COUNTY WATER CMPNY IL1210030 | SALEM | 3,220 | — | — | Compliant |
| NORTHSHORE UNIV GLENBROOK IL3157487 | GLENVIEW | 3,200 | — | — | Compliant |
| KNOXVILLE IL0950300 | KNOXVILLE | 3,120 | — | — | Compliant |
| EAST DUNDEE IL0890250 | EAST DUNDEE | 3,115 | — | — | Compliant |
| SMG WATER COOP IL1370030 | WINCHESTER | 3,110 | — | — | Compliant |
| SLEEPY HOLLOW IL0890750 | SLEEPY HOLLOW | 3,100 | — | — | Compliant |
| MOMENCE IL0910650 | MOMENCE | 3,075 | — | — | Compliant |
| CHRISTOPHER IL0550150 | CHRISTOPHER | 3,072 | — | — | Compliant |
| LAKESIDE PWD IL0775150 | CARBONDALE | 3,065 | — | — | Compliant |
| AQUA ILLINOIS-HAWTHORN WOODS IL0975040 | KANKAKEE | 3,065 | — | — | Compliant |
| SAVANNA IL0150250 | SAVANNA | 3,020 | — | — | Compliant |
| OASIS MHP IL0315185 | NORTHBROOK | 3,000 | — | — | Compliant |
| WINNEBAGO IL2010500 | WINNEBAGO | 3,000 | — | — | Compliant |
| NEWTON IL0790100 | NEWTON | 2,977 | — | — | Compliant |
| MARQUETTE HEIGHTS IL1790400 | MARQUETTE HEIGHTS | 2,974 | — | — | Compliant |
| DIXMOOR IL0310660 | DIXMOOR | 2,973 | 4.8 | 5.5 | Exceeds |
| BUSHNELL IL1090150 | BUSHNELL | 2,972 | — | — | Compliant |
| HAVANA IL1250200 | HAVANA | 2,963 | — | — | Compliant |
| PITTSBURG IL1990600 | PITTSBURG | 2,948 | — | — | Compliant |
| FMC WATER COMPANY IL1210020 | ODIN | 2,945 | — | — | Compliant |
| ARCOLA IL0410050 | ARCOLA | 2,927 | — | — | Compliant |
| WOODRIDGE-FARMINGDALE IL0435370 | DOWNERS GR TWP | 2,865 | — | — | Compliant |
| MOUNT MORRIS IL1410350 | MT. MORRIS | 2,861 | — | — | Compliant |
| HEYWORTH IL1130650 | HEYWORTH | 2,853 | — | — | Compliant |
| HOLIDAY SHORES SD IL1195110 | EDWARDSVILLE | 2,840 | — | — | Compliant |
| ALBION IL0470050 | ALBION | 2,839 | — | — | Compliant |
| SOUTHERN IL UNIVERSITY-EDWARDSVILLE IL1195550 | EDWARDSVILLE | 2,817 | — | — | Compliant |
| EL PASO IL2030150 | EL PASO | 2,812 | — | — | Compliant |
| MCLEANSBORO IL0650200 | MCLEANSBORO | 2,812 | — | — | Compliant |
| SOUTH PALOS TWSP SANITARY DIST IL0310140 | PALOS PARK | 2,800 | — | — | Compliant |
| GREENE CNTY WORK CAMP IL0610010 | WHITE HALL | 2,800 | — | — | Compliant |
| HAMILTON IL0670400 | HAMILTON | 2,753 | — | — | Compliant |
| TRENTON IL0270500 | TRENTON | 2,742 | — | — | Compliant |
| PAWNEE IL1670850 | PAWNEE | 2,739 | — | — | Compliant |
| LAKEMOOR IL0970270 | LAKEMOOR | 2,720 | — | — | Compliant |
| BURNSIDE PWD IL0875050 | NEW BURNSIDE | 2,702 | — | — | Compliant |
| ILLINOIS BENEDICTINE COLLEGE IL0430140 | LISLE TWP | 2,700 | — | — | Compliant |
| LENA IL1770300 | LENA | 2,680 | — | — | Compliant |
| CARROLLTON IL0610050 | CARROLLTON | 2,680 | — | — | Compliant |
| T-L RURAL WATER DISTRICT IL1430030 | GLASFORD | 2,665 | — | — | Compliant |
| COLONA WEST IL0730550 | MOLINE | 2,640 | — | — | Compliant |
| FOX LAKE HILLS SUBDIVISION - LAKE CO PW IL0975550 | LIBERTYVILLE | 2,628 | — | — | Compliant |
| ROUND LAKE HEIGHTS IL0970260 | ROUND LAKE HEIGHTS | 2,622 | — | — | Compliant |
| LOCKPORT TOWNSHIP WATER SYSTEM IL1978100 | JOLIET | 2,610 | — | — | Compliant |
| MOULTRIE COUNTY RWD IL1395150 | SULLIVAN | 2,600 | — | — | Compliant |
| FOUR LAKES VLG SBDV IL0435390 | LISLE TWP | 2,600 | — | — | Compliant |
| BRIDGEPORT IL1010100 | BRIDGEPORT | 2,572 | — | — | Compliant |
| SADDLEBROOK FARMS IL0970120 | GRAYSLAKE | 2,558 | — | — | Compliant |
| MASON CITY IL1250350 | MASON CITY | 2,558 | — | — | Compliant |
| AVISTON IL0270100 | AVISTON | 2,545 | — | — | Compliant |
| ODIN IL1210350 | ODIN | 2,543 | — | — | Compliant |
| GREENWOOD-CREEK NATION WATER COMPANY IL0555200 | MULKEYTOWN | 2,530 | — | — | Compliant |
| KENILWORTH IL0311500 | KENILWORTH | 2,514 | — | — | Compliant |
| CARTHAGE IL0670250 | CARTHAGE | 2,510 | — | — | Compliant |
| DIAMOND IL0630250 | DIAMOND | 2,508 | — | — | Compliant |
| SESSER IL0550450 | SESSER | 2,505 | — | — | Compliant |
| COLONA EAST IL0730400 | MOLINE | 2,501 | — | — | Compliant |
| AMBOY IL1030050 | AMBOY | 2,500 | — | — | Compliant |
| LEWIS UNIV IL1975239 | LOCKPORT TWP | 2,500 | — | — | Compliant |
| PINCKNEYVILLE CORRECTIONAL CENTER IL1450010 | PINCKNEYVILLE | 2,470 | — | — | Compliant |
| IL AMERICAN-VILLA GROVE IL0410350 | GODFREY | 2,467 | — | — | Compliant |
| NEW LENOX-LARAWAY IL1970701 | NEW LENOX TWP | 2,465 | — | — | Compliant |
| PARK CITY MHP IL0975575 | PARK CITY | 2,460 | — | — | Compliant |
| GALVA IL0730450 | GALVA | 2,449 | — | — | Compliant |
| IL AMERICAN-FARMINGTON IL0570500 | GODFREY | 2,448 | — | — | Compliant |
| CLAYTON-CAMP POINT WATER COMMISSION IL0015200 | CAMP POINT | 2,434 | — | — | Compliant |
| LEWISTOWN IL0570600 | LEWISTOWN | 2,400 | — | — | Compliant |
| CENTRAL STICKNEY SD IL0315570 | BURBANK | 2,400 | — | — | Compliant |
| DIXON CORRECTIONAL CENTER IL1035500 | DIXON | 2,400 | — | — | Compliant |
| PARADISE VILLAGE FL6291341 | SKOKIE | 2,396 | — | — | Compliant |
| WEST PRAIRIE WATER CO-OP IL1090030 | MACOMB | 2,395 | — | — | Compliant |
| EWING-INA WATER COMMISSION IL0555350 | WHITTINGTON | 2,393 | — | — | Compliant |
| ST JOSEPH IL0190900 | ST JOSEPH | 2,391 | — | — | Compliant |
| CATLIN IL1830150 | CATLIN | 2,380 | — | — | Compliant |
| ELLERY WATER CORP IL0470010 | ALBION | 2,380 | — | — | Compliant |
| DAWSON IL1670400 | DAWSON | 2,375 | — | — | Compliant |
| POPLAR GROVE IL0070150 | POPLAR GROVE | 2,372 | — | — | Compliant |
| NOKOMIS IL1350450 | NOKOMIS | 2,370 | — | — | Compliant |
| AKIN WATER DISTRICT IL0555120 | THOMPSONVILLE | 2,368 | — | — | Compliant |
| LICK CREEK PWD IL1815100 | BUNCOMBE | 2,365 | — | — | Compliant |
| HICKORY-KERTON WTR COOP IL1695200 | RUSHVILLE | 2,358 | — | — | Compliant |
| POLO IL1410450 | POLO | 2,355 | — | — | Compliant |
| SENECA IL0991050 | SENECA | 2,353 | — | — | Compliant |
| DAVIS JUNCTION IL1410030 | DAVIS JUNCTION | 2,344 | — | — | Compliant |
| OTTER CREEK LAKE UTILITIES DISTRICT IL2015320 | DAVIS | 2,342 | — | — | Compliant |
| THORNTON IL0313090 | THORNTON | 2,333 | — | — | Compliant |
| EGYPTIAN WATER COMPANY IL1570010 | NASHVILLE | 2,330 | — | — | Compliant |
| AQUA ILLINOIS-TIMBER RIDGE IL1970410 | KANKAKEE | 2,322 | — | — | Compliant |
| OBLONG IL0330150 | OBLONG | 2,321 | — | — | Compliant |
| WHITE HALL IL0610400 | WHITE HALL | 2,313 | — | — | Compliant |
| ARTHUR IL1394040 | ARTHUR | 2,300 | — | — | Compliant |
| ALTAMONT IL0490050 | ALTAMONT | 2,300 | — | — | Compliant |
| LAKE BARRINGTON SHORES SUBDIVSION IL0975520 | LAKE BARRINGTON | 2,300 | — | — | Compliant |
| PRAIRIE PATH WATER COMPANY-GALENA IL0855050 | GALENA | 2,294 | — | — | Compliant |
| PROSPECT HEIGHTS IL0312530 | PROSPECT HEIGHTS | 2,280 | — | — | Compliant |
| ROSEBUD MHP IL0310310 | BRIDGEVIEW | 2,250 | — | — | Compliant |
| HENRY IL1230050 | HENRY | 2,230 | — | — | Compliant |
| ELWOOD IL1970350 | ELWOOD | 2,229 | — | — | Compliant |
| BRIDGEVIEW SOUTHFIELD SBDV IL0310271 | BRIDGEVIEW | 2,200 | — | — | Compliant |
| TAMAROA IL1450250 | DUQUOIN | 2,197 | — | — | Compliant |
| PECATONICA IL2010250 | PECATONICA | 2,195 | — | — | Compliant |
| MOUNT OLIVE IL1170700 | AVISTON | 2,193 | — | — | Compliant |
| GROVELAND TOWNSHIP WATER DISTRICT IL1795200 | GROVELAND | 2,185 | — | — | Compliant |
| SOUTHWATER INC IL0030020 | TAMMS | 2,185 | — | — | Compliant |
| THOMSON MAXIMUM SECURITY CENTER IL0150030 | THOMSON | 2,166 | — | — | Compliant |
| NORRIS CITY IL1930350 | NORRIS CITY | 2,155 | — | — | Compliant |
| GRAHAM CORRECTIONAL SITE IL1355100 | HILLSBORO | 2,155 | — | — | Compliant |
| CARBON CLIFF IL1610100 | CARBON CLIFF | 2,134 | — | — | Compliant |
| TREMONT IL1790700 | TREMONT | 2,114 | — | — | Compliant |
| PROPHETSTOWN IL1950400 | PROPHETSTOWN | 2,100 | — | — | Compliant |
| RICHMOND IL1110750 | RICHMOND | 2,087 | — | — | Compliant |
| CAMBRIDGE IL0730300 | CAMBRIDGE | 2,086 | — | — | Compliant |
| CARRIER MILLS IL1650050 | CARRIER MILLS | 2,085 | — | — | Compliant |
| EJ WATER-MCWC IL1350020 | DIETERICH | 2,075 | — | — | Compliant |
| ELGIN MHC IL0895910 | ELGIN TWP | 2,074 | — | — | Compliant |
| ELMWOOD IL1430300 | ELMWOOD | 2,058 | — | — | Compliant |
| FARMER CITY IL0390150 | FARMER CITY | 2,055 | — | — | Compliant |
| THORNWOOD HMOWNRS ASSN IL0890070 | ELGIN TWP | 2,045 | — | — | Compliant |
| IL AMERICAN-FISHER IL0190150 | GODFREY | 2,026 | — | — | Compliant |
| LIMESTONE-WALTERS PWD IL1430020 | PEORIA | 2,023 | — | — | Compliant |
| CLAY COUNTY WATER INC IL0250020 | FLORA | 2,015 | — | — | Compliant |
| ROCKDALE IL1970850 | ROCKDALE | 2,012 | — | — | Compliant |
| HINCKLEY IL0370200 | HINCKLEY | 2,006 | — | — | Compliant |
| FERMI NTL ACCL LAB- MAIN SITE IL0430070 | WINFIELD TWP | 2,000 | — | — | Compliant |
| SOUTHEAST JOLIET SD IL1977490 | JOLIET | 2,000 | — | — | Compliant |
| KIRKLAND IL0370300 | KIRKLAND | 2,000 | — | — | Compliant |
| ROANOKE IL2030550 | ROANOKE | 2,000 | — | — | Compliant |
| FOREST HOMES-MAPLE PARK PWD IL1195100 | COTTAGE HILLS | 2,000 | — | — | Compliant |
| PHOENIX IL0312490 | PHOENIX | 1,994 | — | — | Compliant |
| CLINTON COUNTY EAST PWD IL0275150 | CENTRALIA | 1,980 | — | — | Compliant |
| DIX-KELL WATER COMMSSION IL0815100 | DIX | 1,972 | — | — | Compliant |
| NEW ATHENS IL1631050 | NEW ATHENS | 1,970 | — | — | Compliant |
| MITCHELLSVILLE PWD IL1655200 | HARRISBURG | 1,970 | — | — | Compliant |
| MERRIONETTE PARK IL0311890 | MERRIONETTE PARK | 1,969 | — | — | Compliant |
| WONDER LAKE (NIU) IL1115850 | WONDER LAKE | 1,950 | — | — | Compliant |
| HENDERSON PWD IL1350010 | CARLINVILLE | 1,937 | — | — | Compliant |
| IL AMERICAN-WAYCINDEN IL0317550 | GODFREY | 1,934 | — | — | Compliant |
| STEEPLE RUN SBDV IL0437160 | DARIEN | 1,931 | — | — | Compliant |
| GLEN ELLYN HEIGHTS SUBDIVISION IL0435500 | DARIEN | 1,931 | — | — | Compliant |
| STEELEVILLE IL1570650 | STEELEVILLE | 1,930 | — | — | Compliant |
| DANVILLE CRCTNL CNTR IL1835400 | DANVILLE | 1,930 | — | — | Compliant |
| BELLE RIVE IL0810050 | BELLE RIVE | 1,930 | — | — | Compliant |
| LEXINGTON IL1130800 | LEXINGTON | 1,930 | — | — | Compliant |
| MINONK IL2030400 | MINONK | 1,928 | — | — | Compliant |
| MARISSA IL1630750 | FREEBURG | 1,921 | — | — | Compliant |
| DE SOTO IL0770200 | DESOTO | 1,910 | — | — | Compliant |
| PRINCEVILLE IL1430750 | PRINCEVILLE | 1,901 | — | — | Compliant |
| WALTONVILLE IL0810400 | MT. VERNON | 1,901 | — | — | Compliant |
| SOUTH ROXANA IL1190970 | SOUTH ROXANA | 1,891 | — | — | Compliant |
| GIRARD IL1170450 | GIRARD | 1,885 | — | — | Compliant |
| AQUA ILLINOIS-OAK RUN IL0955200 | KANKAKEE | 1,885 | — | — | Compliant |
| CENTRAL MACOUPIN COUNTY RWD IL1170040 | CARLINVILLE | 1,883 | — | — | Compliant |
| BLUFORD IL0810100 | BLUFORD | 1,880 | — | — | Compliant |
| LACON IL1230100 | LACON | 1,878 | — | — | Compliant |
| RURAL WABASH COUNTY WATER DISTRICT IL1850010 | LANCASTER | 1,877 | — | — | Compliant |
| POPLAR GROVE SOUTH IL0070300 | POPLAR GROVE | 1,877 | — | — | Compliant |
| HAMPTON IL1610300 | HAMPTON | 1,863 | — | — | Compliant |
| PRAIRIE DUPONT PWD IL1635070 | EAST CARONDELET | 1,863 | — | — | Compliant |
| AQUA ILLINOIS-MCHENRY SHORES IL1115020 | KANKAKEE | 1,862 | — | — | Compliant |
| CARLYLE NORTH WATER COMPANY, INC. IL0270010 | CARLYLE | 1,850 | — | — | Compliant |
| HUDSON IL1130700 | HUDSON | 1,847 | — | — | Compliant |
| DE PUE IL0110300 | DEPUE | 1,838 | — | — | Compliant |
| ST JACOB IL1190950 | ST. JACOB | 1,835 | — | — | Compliant |
| IL AMERICAN-CAIRO IL0035030 | GODFREY | 1,821 | — | — | Compliant |
| CARLYLE SOUTHWEST PWD IL0275120 | CENTRALIA | 1,815 | — | — | Compliant |
| FORD HEIGHTS IL0310720 | FORD HEIGHTS | 1,813 | — | — | Compliant |
| JONESBORO IL1810250 | JONESBORO | 1,799 | — | — | Compliant |
| GILMAN IL0750450 | GILMAN | 1,793 | — | — | Compliant |
| SOMONAUK IL0374870 | SOMONAUK | 1,786 | — | — | Compliant |
| CHENOA IL1130300 | CHENOA | 1,785 | — | — | Compliant |
| MOWEAQUA IL1730200 | MOWEAQUA | 1,785 | — | — | Compliant |
| MEADOWBROOK PWD IL1195200 | BETHALTO | 1,778 | — | — | Compliant |
| ZEIGLER IL0550750 | ZEIGLER | 1,774 | — | — | Compliant |
| CRAB ORCHARD PWD IL0775050 | CARBONDALE | 1,773 | — | — | Compliant |
| GRANTFORK IL1190350 | HIGHLAND | 1,766 | — | — | Compliant |
| CENTRAL ALEXANDER CNTY PWD IL0035100 | OLIVE BRANCH | 1,763 | — | — | Compliant |
| AQUA ILLINOIS-ROCKWELL IL0970110 | KANKAKEE | 1,762 | — | — | Compliant |
| BUNKER HILL IL1170100 | BUNKER HILL | 1,760 | — | — | Compliant |
| ORION IL0730700 | ORION | 1,754 | — | — | Compliant |
| ROODHOUSE IL0610350 | ROODHOUSE | 1,753 | — | — | Compliant |
| DELAVAN IL1790150 | DELAVAN | 1,743 | — | — | Compliant |
| STOCKTON IL0850450 | STOCKTON | 1,728 | — | — | Compliant |
| CAMBRIA IL1990100 | CAMBRIA | 1,727 | — | — | Compliant |
| CRAINVILLE IL1990250 | CRAINVILLE | 1,711 | — | — | Compliant |
| PIERRON IL1194760 | PIERRON | 1,709 | — | — | Compliant |
| MAROA IL1150300 | MAROA | 1,700 | — | — | Compliant |
| SUGAR GROVE - PRESTBURY IL0895520 | SUGAR GROVE TWP | 1,700 | — | — | Compliant |
| PATRIOTS LANDING IL1630040 | UNSPEC PL IN CO | 1,700 | — | — | Compliant |
| CHICAGO READ MHC IL0317720 | NORWOOD PARK TWP | 1,700 | — | — | Compliant |
| ATLANTA IL1070050 | ATLANTA | 1,692 | — | — | Compliant |
| ST ROSE PWD IL0275250 | ST ROSE | 1,688 | — | — | Compliant |
| PORT BYRON IL1610550 | PORT BYRON | 1,678 | — | — | Compliant |
| SHERIDAN CORRECTIONAL CENTER IL0995840 | SHERIDAN | 1,670 | — | — | Compliant |
| PONTIAC CORRECTIONAL CENTER IL1055500 | PONTIAC | 1,665 | — | — | Compliant |
| BEMENT IL1470050 | BEMENT | 1,661 | — | — | Compliant |
| EATON PWD IL0335100 | ANNAPOLIS | 1,655 | — | — | Compliant |
| PROVIDENCE AT PAINTED LAKES IL0971100 | LAKE VILLA | 1,650 | — | — | Compliant |
| NEOGA IL0350150 | NEOGA | 1,636 | — | — | Compliant |
| PEKIN FED CORRECTIONAL INST AND PRSNCMP IL1790030 | PEKIN | 1,635 | — | — | Compliant |
| NORTHFIELD ESTATES MI0040594 | OAK BROOK | 1,620 | — | — | Compliant |
| VIENNA IL0870350 | VIENNA | 1,618 | — | — | Compliant |
| SHAWNEE CORRECTIONAL CENTER IL0870010 | DIETERICH | 1,617 | — | — | Compliant |
| EARLVILLE IL0990150 | EARLVILLE | 1,613 | — | — | Compliant |
| GRAYVILLE IL1934460 | GRAYVILLE | 1,613 | — | — | Compliant |
| BENLD IL1170050 | BENLD | 1,612 | — | — | Compliant |
| WARSAW IL0670650 | WARSAW | 1,607 | — | — | Compliant |
| DUNLAP IL1430250 | DUNLAP | 1,603 | — | — | Compliant |
| PRAIRIE PATH WATER COMPANY-OAKWOOD IL1830600 | MCHENRY | 1,600 | — | — | Compliant |
| ERIE IL1950200 | ERIE | 1,600 | — | — | Compliant |
| WESTERN IL CORRECTIONAL CENTER IL0090010 | MT. STERLING | 1,600 | — | — | Compliant |
| HERSCHER IL0910450 | HERSCHER | 1,600 | — | — | Compliant |
| IL VETERANS HM-MANTENO IL0915930 | MANTENO TWP | 1,600 | — | — | Compliant |
| JEROME IL1670600 | SPRINGFIELD | 1,600 | — | — | Compliant |
| TEUTOPOLIS IL0490450 | TEUTOPOLIS | 1,599 | — | — | Compliant |
| WINCHESTER IL1710350 | WINCHESTER | 1,589 | — | — | Compliant |
| IL AMERICAN-ARROWHEAD IL0435150 | GODFREY | 1,581 | — | — | Compliant |
| JASPER WATERWORKS CORPORATION IL1910020 | FAIRFIELD | 1,578 | — | — | Compliant |
| EAST DUBUQUE IL0850100 | EAST DUBUQUE | 1,565 | — | — | Compliant |
| LCPW - BROOKS FARM SUBDIVISION IL0970280 | LIBERTYVILLE | 1,563 | — | — | Compliant |
| KINCAID IL0210250 | KINCAID | 1,561 | — | — | Compliant |
| MANITO IL1250300 | MANITO | 1,552 | — | — | Compliant |
| HOOTON PWD IL1835100 | DANVILLE TWP | 1,550 | — | — | Compliant |
| FCI-MARION IL1995247 | MARION | 1,544 | — | — | Compliant |
| GERMANTOWN IL0270350 | GERMANTOWN | 1,537 | — | — | Compliant |
| SANDOVAL IL1210500 | SANDOVAL | 1,528 | — | — | Compliant |
| PHEASANT LAKE ESTATES MHP IL1975385 | BEECHER | 1,528 | — | — | Compliant |
| OKAWVILLE IL1890400 | OKAWVILLE | 1,521 | — | — | Compliant |
| COUNTRYSIDE MANOR SBDV- LAKE CO PW IL0975250 | LIBERTYVILLE | 1,518 | — | — | Compliant |
| IL RIVER CRCTL CTR IL0570020 | CANTON TWP | 1,516 | — | — | Compliant |
| VIRGINIA IL0170250 | VIRGINIA | 1,514 | — | — | Compliant |
| RE WATER CORPORATION IL1590020 | DIETERICH | 1,513 | — | — | Compliant |
| GREENUP IL0350050 | GREENUP | 1,513 | — | — | Compliant |
| ROXANA IL1190900 | ROXANA | 1,509 | — | — | Compliant |
| PLEASANT PLAINS IL1670900 | PLEASANT PLAINS | 1,508 | — | — | Compliant |
| IL AMERICAN-MOUNT PULASKI IL1070400 | GODFREY | 1,506 | — | — | Compliant |
| WATERMAN IL0370600 | WATERMAN | 1,506 | — | — | Compliant |
| LANARK IL0150100 | LANARK | 1,504 | — | — | Compliant |
| EAST HAZEL CREST IL0310750 | EAST HAZEL CREST | 1,500 | — | — | Compliant |
| CLIFTON IL0750250 | CLIFTON | 1,500 | — | — | Compliant |
| RAVINIA PINES MHC - NEW CHICAGO IN5245058 | NORTHBROOK | 1,500 | — | — | Compliant |
| VANDALIA CORRECTIONAL CENTER IL0515500 | VANDALIA | 1,500 | — | — | Compliant |
| GLENVIEW NAVAL AIR STATION IL0315647 | NORTHFIELD TWP | 1,500 | — | — | Compliant |
| UNION PACIFIC RAILROAD IL0315320 | DOLTON | 1,500 | — | — | Compliant |
| LOGAN CORRECTIONAL CENTER IL1075520 | LINCOLN | 1,500 | — | — | Compliant |
| MOUND PWD IL1635050 | COLLINSVILLE | 1,500 | — | — | Compliant |
| OAK FOREST HEALTH CENTER IL0317789 | CHICAGO | 1,500 | — | — | Compliant |
| PRAIRIE PATH WATER COMPANY-WESTLAKE IL2010070 | MCHENRY | 1,493 | — | — | Compliant |
| MAPLE PARK IL0890500 | MAPLE PARK | 1,484 | — | — | Compliant |
| GREENFIELD IL0610150 | GREENFIELD | 1,480 | — | — | Compliant |
| MOUNT CARROLL IL0150200 | MT CARROLL | 1,479 | — | — | Compliant |
| NORTH PEKIN IL1790550 | NORTH PEKIN | 1,478 | — | — | Compliant |
| BETHANY IL1390100 | BETHANY | 1,475 | — | — | Compliant |
| GARDEN HOME SD IL0315620 | GARDEN HOMES | 1,472 | — | — | Compliant |
| HODGKINS IL0311260 | HODGKINS | 1,472 | — | — | Compliant |
| GREEN OAKS IL0970040 | GREEN OAKS | 1,470 | — | — | Compliant |
| SILVIS HEIGHTS WATER CORP IL1615750 | SILVIS | 1,450 | — | — | Compliant |
| OAKBROOK TERRACE IL0430750 | OAKBROOK TERRACE | 1,440 | — | — | Compliant |
| CRYSTAL LAWNS ADDITION IMPROVEMENT ASSOC IL1975480 | JOLIET | 1,435 | — | — | Compliant |
| CERRO GORDO IL1470100 | CERRO GORDO | 1,433 | — | — | Compliant |
| SOUTH FULTON WATER DISTRICT IL0570010 | ASTORIA | 1,430 | — | — | Compliant |
| DEVILS KITCHEN WATER DISTRICT IL1995160 | CARBONDALE | 1,428 | — | — | Compliant |
| DURAND IL2010100 | DURAND | 1,427 | — | — | Compliant |
| WYNSTONE WATER COMPANY IL0970080 | GENEVA | 1,424 | — | — | Compliant |
| YORK TOWNSHIP WATER SYSTEM IL0430010 | DARIEN | 1,423 | — | — | Compliant |
| GRIDLEY IL1130600 | GRIDLEY | 1,411 | — | — | Compliant |
| ONARGA IL0750700 | ONARGA | 1,409 | — | — | Compliant |
| GRANDVIEW IL1670500 | SPRINGFIELD | 1,405 | — | — | Compliant |
| MURRAYVILLE-WOODSON WATER COMMISSION IL1375150 | MURRAYVILLE | 1,403 | — | — | Compliant |
| SUNSET MHP IL0310080 | NORTHBROOK | 1,400 | — | — | Compliant |
| GRANT PARK IL0910400 | KANKAKEE | 1,400 | — | — | Compliant |
| NORTH UTICA IL0990650 | UTICA | 1,400 | — | — | Compliant |
| CENTRALIA CORRECTIONAL SITE IL0275600 | CENTRALIA | 1,397 | — | — | Compliant |
| COLCHESTER IL1090200 | COLCHESTER | 1,395 | — | — | Compliant |
| NILWOOD IL1170750 | MODESTO | 1,394 | — | — | Compliant |
| IL AMERICAN-ROSICLARE IL0690160 | GODFREY | 1,387 | — | — | Compliant |
| ROSICLARE IL0690150 | BELLEVILLE | 1,387 | — | — | Compliant |
| PAYSON IL0010550 | PAYSON | 1,386 | — | — | Compliant |
| NEW BERLIN IL1670800 | NEW BERLIN | 1,380 | — | — | Compliant |
| AQUA ILLINOIS-PHILO IL0190600 | KANKAKEE | 1,378 | — | — | Compliant |
| ASTORIA IL0570050 | ASTORIA | 1,375 | — | — | Compliant |
| IL AMERICAN-HARDIN COUNTY IL0690020 | GODFREY | 1,373 | — | — | Compliant |
| TOWER LAKES IL0975010 | VOLO | 1,372 | — | — | Compliant |
| HEBRON IL1110300 | HEBRON | 1,368 | — | — | Compliant |
| GARDNER IL0630400 | GARDNER | 1,361 | — | — | Compliant |
| HILLTOP MHP IL1130080 | BLOOMINGTON | 1,360 | — | — | Compliant |
| GRANVILLE IL1550050 | GRANVILLE | 1,359 | — | — | Compliant |
| CAPRON IL0070100 | CAPRON | 1,343 | — | — | Compliant |
| HERITAGE LAKES SUBDIVISION IL1795460 | MACKINAW TWP | 1,341 | — | — | Compliant |
| FORRESTON IL1410200 | FORRESTON | 1,338 | — | — | Compliant |
| BONNIE BRAE FOREST MANOR SNDST IL1975140 | LOCKPORT | 1,338 | — | — | Compliant |
| ROCK SPRINGS MHP FL3481093 | SKOKIE | 1,338 | — | — | Compliant |
| ASHLAND IL0170100 | ASHLAND | 1,333 | — | — | Compliant |
| ROSSVILLE IL1830800 | ROSSVILLE | 1,331 | — | — | Compliant |
| WARREN IL0850500 | WARREN | 1,323 | — | — | Compliant |
| HARRISTOWN IL1150210 | DECATUR | 1,320 | — | — | Compliant |
| EAST MORELAND WTR SERVICE ASSN IL1975600 | JOLIET | 1,320 | — | — | Compliant |
| OTTER LAKE WATER COMMISSION IL1175200 | VIRDEN | 1,318 | — | — | Compliant |
| BARRY IL1490050 | BARRY | 1,318 | — | — | Compliant |
| ASSUMPTION IL0210050 | ASSUMPTION | 1,315 | — | — | Compliant |
| WALNUT IL0111100 | WALNUT | 1,311 | — | — | Compliant |
| MILFORD IL0750650 | MILFORD | 1,306 | — | — | Compliant |
| HILL CRCTL CTR IL0950010 | GALESBURG TWP | 1,300 | — | — | Compliant |
| TAYLORVILLE CORRECTIONAL CENTER IL0210010 | TAYLORVILLE | 1,300 | — | — | Compliant |
| FDL CRCTL INST & PRSN CMP IL0050010 | GREENVILLE | 1,300 | — | — | Compliant |
| BLUE MOUND IL1150100 | MOWEAQUA | 1,300 | — | — | Compliant |
| WYOMING IL1750200 | WYOMING | 1,300 | — | — | Compliant |
| PRAIRIE PATH WATER COMPANY-LAKE WILDWOOD IL1235200 | OAKWOOD | 1,295 | — | — | Compliant |
| COUNTRYSIDE LAKE SUBDIVISION -LAKE CO PW IL0975200 | LIBERTYVILLE | 1,287 | — | — | Compliant |
| NEW HOPE WATERWORKS CORP IL1915100 | FAIRFIELD | 1,285 | — | — | Compliant |
| IL AMERICAN-WASHINGTON ESTATES IL1797050 | GODFREY | 1,278 | — | — | Compliant |
| TOLEDO IL0350200 | TOLEDO | 1,278 | — | — | Compliant |
| PETROLIA PWD IL1015350 | BRIDGEPORT | 1,275 | — | — | Compliant |
| ST ELMO IL0510250 | ST ELMO | 1,272 | — | — | Compliant |
| COBDEN IL1810150 | COBDEN | 1,267 | — | — | Compliant |
| VALMEYER IL1330250 | VALMEYER | 1,263 | — | — | Compliant |
| LADD IL0110450 | LADD | 1,263 | — | — | Compliant |
| HARTFORD IL1190500 | HARTFORD | 1,260 | — | — | Compliant |
| GRIGGSVILLE IL1490300 | GRIGGSVILLE | 1,259 | — | — | Compliant |