Illinois Tap Water Quality: Is It Safe to Drink?

2026 EPA water quality data for 1,784 community water systems serving a combined 12,123,368 people in Illinois. Find your water system to see violations, PFAS results, lead testing, and a safety grade — free.

Illinois draws drinking water from Lake Michigan (for Chicago and the northern suburbs) and from rivers and aquifers downstate. Radium contamination in deep wells has affected communities across the Fox River Valley and north-central Illinois. Lead from aging service lines is a significant concern in Chicago, which has more lead pipes than any other U.S. city.

Find Your Water System in Illinois

Enter your ZIP code to see EPA violations, lead test results, PFAS data, and a safety grade for your water.

📊 Data from EPA’s SDWIS · 🔄 Updated quarterly · 🏛️ 1,784 water systems in Illinois

Showing the 250 largest of 1,784 community water systems in Illinois, by population served. Use the ZIP search above or the city links to find a smaller system.

CHICAGO CHICAGO, IL · 2,746,388 people · Surface Water AURORA AURORA, IL · 183,000 people · Surface Water JOLIET JOLIET, IL · 160,000 people · Groundwater NAPERVILLE NAPERVILLE, IL · 156,406 people · Surface Water Purchased IL AMERICAN-CHAMPAIGN GODFREY, IL · 150,000 people · Groundwater ROCKFORD ROCKFORD, IL · 147,051 people · Groundwater IL AMERICAN-PEORIA GODFREY, IL · 137,575 people · Surface Water IL AMERICAN-EAST ST LOUIS GODFREY, IL · 131,368 people · Surface Water SPRINGFIELD SPRINGFIELD, IL · 117,444 people · Surface Water ELGIN ELGIN, IL · 114,797 people · Surface Water WAUKEGAN WAUKEGAN, IL · 87,149 people · Surface Water CICERO CICERO, IL · 83,000 people · Surface Water Purchased AQUA ILLINOIS-KANKAKEE KANKAKEE, IL · 80,000 people · Surface Water BLOOMINGTON BLOOMINGTON, IL · 77,610 people · Surface Water DECATUR DECATUR, IL · 76,122 people · Surface Water SCHAUMBURG SCHAUMBURG, IL · 75,750 people · Surface Water Purchased EVANSTON EVANSTON, IL · 74,486 people · Surface Water IL AMERICAN-WEST SUBURBAN GODFREY, IL · 73,978 people · Surface Water Purchased ARLINGTON HEIGHTS ARLINGTON HEIGHTS, IL · 73,320 people · Surface Water Purchased PALATINE PALATINE, IL · 70,875 people · Surface Water Purchased SKOKIE SKOKIE, IL · 66,422 people · Surface Water Purchased DES PLAINES DES PLAINES, IL · 60,675 people · Surface Water Purchased OAK LAWN OAK LAWN, IL · 58,362 people · Surface Water Purchased ORLAND PARK ORLAND PARK, IL · 58,020 people · Surface Water Purchased BERWYN BERWYN, IL · 57,250 people · Surface Water Purchased TINLEY PARK TINLEY PARK, IL · 56,703 people · Surface Water Purchased OAK PARK OAK PARK, IL · 54,583 people · Surface Water Purchased WHEATON WHEATON, IL · 53,970 people · Surface Water Purchased NORMAL NORMAL, IL · 52,736 people · Groundwater ROMEOVILLE ROMEOVILLE, IL · 50,458 people · Groundwater HOFFMAN ESTATES HOFFMAN ESTATES, IL · 50,179 people · Surface Water Purchased PLAINFIELD PLAINFIELD, IL · 50,000 people · Surface Water Purchased DOWNERS GROVE DOWNERS GROVE, IL · 49,425 people · Surface Water Purchased GLENVIEW GLENVIEW, IL · 47,856 people · Surface Water Purchased O FALLON O'FALLON, IL · 46,603 people · Surface Water Purchased IL AMERICAN-ALTON GODFREY, IL · 46,127 people · Surface Water DEKALB DEKALB, IL · 45,000 people · Groundwater ELMHURST ELMHURST, IL · 45,000 people · Surface Water Purchased MOLINE MOLINE, IL · 44,500 people · Surface Water LOMBARD LOMBARD, IL · 44,476 people · Surface Water Purchased BUFFALO GROVE BUFFALO GROVE, IL · 43,212 people · Surface Water Purchased QUINCY QUINCY, IL · 42,000 people · Surface Water BARTLETT BARTLETT, IL · 41,500 people · Surface Water Purchased MOUNT PROSPECT MOUNT PROSPECT, IL · 41,000 people · Surface Water Purchased CRYSTAL LAKE CRYSTAL LAKE, IL · 40,661 people · Groundwater CAROL STREAM CAROL STREAM, IL · 39,854 people · Surface Water Purchased PARK RIDGE PARK RIDGE, IL · 39,800 people · Surface Water Purchased WHEELING WHEELING, IL · 39,725 people · Surface Water Purchased STREAMWOOD STREAMWOOD, IL · 39,577 people · Surface Water Purchased ROCK ISLAND ROCK ISLAND, IL · 39,018 people · Surface Water OSWEGO OSWEGO, IL · 38,169 people · Groundwater ADDISON ADDISON, IL · 38,017 people · Surface Water Purchased CARPENTERSVILLE CARPENTERSVILLE, IL · 37,983 people · Groundwater HANOVER PARK HANOVER PARK, IL · 37,470 people · Surface Water Purchased CALUMET CITY CALUMET CITY, IL · 37,000 people · Surface Water Purchased NORTH PARK PWD MACHESNEY PARK, IL · 35,580 people · Groundwater ELK GROVE VILLAGE ELK GROVE VILLAGE, IL · 34,700 people · Surface Water Purchased NORTHBROOK NORTHBROOK, IL · 34,407 people · Surface Water WOODRIDGE WOODRIDGE, IL · 33,566 people · Surface Water Purchased VERNON HILLS - LAKE CO PW LIBERTYVILLE, IL · 33,207 people · Surface Water Purchased GLENDALE HEIGHTS GLENDALE HEIGHTS, IL · 33,176 people · Surface Water Purchased ST CHARLES ST. CHARLES, IL · 33,103 people · Groundwater IL AMERICAN-PEKIN GODFREY, IL · 31,731 people · Groundwater GALESBURG GALESBURG, IL · 31,620 people · Groundwater MUNDELEIN MUNDELEIN, IL · 31,500 people · Surface Water Purchased ALGONQUIN ALGONQUIN, IL · 30,700 people · Groundwater GURNEE GURNEE, IL · 30,193 people · Surface Water Purchased HIGHLAND PARK HIGHLAND PARK, IL · 30,176 people · Surface Water AQUA ILLINOIS-VERMILION COUNTY KANKAKEE, IL · 30,106 people · Surface Water AQUA ILLINOIS-NORTH MAINE UTILITIES KANKAKEE, IL · 30,043 people · Surface Water Purchased SOUTH STICKNY SD BURBANK, IL · 30,000 people · Surface Water Purchased EJ WATER COOPERATIVE DIETERICH, IL · 29,720 people · Surface Water COLLINSVILLE COLLINSVILLE, IL · 29,500 people · Groundwater NILES NILES, IL · 29,350 people · Surface Water Purchased LANSING LANSING, IL · 29,076 people · Surface Water Purchased MONTGOMERY MONTGOMERY, IL · 28,956 people · Groundwater GLEN ELLYN GLEN ELLYN, IL · 28,850 people · Surface Water Purchased LAKE IN THE HILLS LAKE IN THE HILLS, IL · 28,661 people · Groundwater HUNTLEY HUNTLEY, IL · 28,495 people · Groundwater NEW LENOX NEW LENOX, IL · 27,690 people · Surface Water Purchased IL AMERICAN-GRANITE CITY GODFREY, IL · 27,549 people · Surface Water OAK FOREST OAK FOREST, IL · 27,478 people · Surface Water Purchased ROUND LAKE BEACH ROUND LAKE BEACH, IL · 27,200 people · Surface Water Purchased WILMETTE WILMETTE, IL · 27,087 people · Surface Water EDWARDSVILLE EDWARDSVILLE, IL · 26,808 people · Groundwater CHICAGO HEIGHTS CHICAGO HEIGHTS, IL · 26,184 people · Surface Water Purchased BATAVIA BATAVIA, IL · 26,098 people · Groundwater WOODSTOCK WOODSTOCK, IL · 25,630 people · Groundwater BELVIDERE BELVIDERE, IL · 25,339 people · Groundwater MORTON GROVE MORTON GROVE, IL · 25,297 people · Surface Water Purchased WEST CHICAGO WEST CHICAGO, IL · 25,166 people · Groundwater ELMWOOD PARK ELMWOOD PARK, IL · 25,000 people · Surface Water Purchased HARVEY HARVEY, IL · 25,000 people · Surface Water Purchased IL AMERICAN-HOMER TOWNSHIP GODFREY, IL · 24,543 people · Surface Water Purchased ZION ZION, IL · 24,442 people · Surface Water Purchased LISLE LISLE, IL · 24,233 people · Surface Water Purchased MELROSE PARK MELROSE PARK, IL · 24,206 people · Surface Water Purchased WESTMONT WESTMONT, IL · 24,161 people · Surface Water Purchased MAYWOOD MAYWOOD, IL · 24,090 people · Surface Water Purchased FRANKFORT FRANKFORT, IL · 24,000 people · Groundwater FREEPORT FREEPORT, IL · 23,930 people · Groundwater SOUTH ELGIN SOUTH ELGIN, IL · 23,648 people · Groundwater LOVES PARK LOVES PARK, IL · 23,335 people · Groundwater ROLLING MEADOWS ROLLING MEADOWS, IL · 23,329 people · Surface Water Purchased LOCKPORT LOCKPORT, IL · 23,100 people · Groundwater YORKVILLE YORKVILLE, IL · 23,000 people · Groundwater GREAT LAKES NAVAL TRAINING STATION GREAT LAKES, IL · 23,000 people · Surface Water ROSELLE ROSELLE, IL · 22,897 people · Surface Water Purchased MCHENRY MCHENRY, IL · 22,335 people · Groundwater EAST PEORIA EAST PEORIA, IL · 22,284 people · Groundwater VILLA PARK VILLA PARK, IL · 22,263 people · Surface Water Purchased CARBONDALE CARBONDALE, IL · 22,107 people · Surface Water BLOOMINGDALE BLOOMINGDALE, IL · 22,018 people · Surface Water Purchased SOUTH HOLLAND SOUTH HOLLAND, IL · 22,000 people · Surface Water Purchased DARIEN DARIEN, IL · 21,751 people · Surface Water Purchased PARK FOREST PARK FOREST, IL · 21,687 people · Groundwater BLUE ISLAND BLUE ISLAND, IL · 21,494 people · Surface Water Purchased EAST MOLINE EAST MOLINE, IL · 21,374 people · Surface Water GRAYSLAKE GRAYSLAKE, IL · 21,248 people · Surface Water Purchased GENEVA GENEVA, IL · 21,247 people · Groundwater CREST HILL CREST HILL, IL · 21,169 people · Groundwater DOLTON DOLTON, IL · 20,510 people · Surface Water Purchased LIBERTYVILLE LIBERTYVILLE, IL · 20,500 people · Surface Water Purchased EVERGREEN PARK EVERGREEN PARK, IL · 19,943 people · Surface Water Purchased JACKSONVILLE JACKSONVILLE, IL · 19,903 people · Surface Water MOKENA MOKENA, IL · 19,887 people · Surface Water Purchased LAKE ZURICH LAKE ZURICH, IL · 19,759 people · Groundwater LAKE FOREST LAKE FOREST, IL · 19,642 people · Surface Water MATTOON MATTOON, IL · 19,500 people · Surface Water HOMEWOOD HOMEWOOD, IL · 19,463 people · Surface Water Purchased DEERFIELD DEERFIELD, IL · 19,196 people · Surface Water Purchased BELLWOOD BELLWOOD, IL · 19,156 people · Surface Water Purchased ALSIP ALSIP, IL · 19,063 people · Surface Water Purchased IL AMERICAN-STREATOR GODFREY, IL · 19,000 people · Surface Water BROOKFIELD BROOKFIELD, IL · 18,776 people · Surface Water Purchased SHOREWOOD SHOREWOOD, IL · 18,645 people · Groundwater BENSENVILLE BENSENVILLE, IL · 18,537 people · Surface Water Purchased PALOS HILLS PALOS HILLS, IL · 18,530 people · Surface Water Purchased SYCAMORE SYCAMORE, IL · 18,500 people · Groundwater FRANKLIN PARK FRANKLIN PARK, IL · 18,467 people · Surface Water Purchased JUSTICE-WILLOW SPRINGS WATER COMMISSION JUSTICE, IL · 18,457 people · Surface Water Purchased ROUND LAKE ROUND LAKE, IL · 18,430 people · Surface Water Purchased MATTESON MATTESON, IL · 18,293 people · Surface Water Purchased NORTH AURORA NORTH AURORA, IL · 18,261 people · Groundwater OTTAWA OTTAWA, IL · 18,097 people · Groundwater HINSDALE HINSDALE, IL · 17,900 people · Surface Water Purchased CARY CARY, IL · 17,826 people · Groundwater LEMONT LEMONT, IL · 17,500 people · Groundwater CHARLESTON CHARLESTON, IL · 17,286 people · Surface Water MORTON MORTON, IL · 17,111 people · Groundwater TROY TROY, IL · 16,962 people · Groundwater MARION MARION, IL · 16,855 people · Surface Water Purchased NORTH CHICAGO NORTH CHICAGO, IL · 16,813 people · Surface Water CANTON CANTON, IL · 16,748 people · GWUDI COUNTRY CLUB HILLS COUNTRY CLUB HILLS, IL · 16,500 people · Surface Water Purchased BRIDGEVIEW BRIDGEVIEW, IL · 16,467 people · Surface Water Purchased CHATHAM CHATHAM, IL · 16,423 people · Groundwater Purchased WESTCHESTER WESTCHESTER, IL · 16,241 people · Surface Water Purchased LA GRANGE LA GRANGE, IL · 16,200 people · Surface Water Purchased MOUNT VERNON MOUNT VERNON, IL · 15,793 people · Surface Water Purchased PALOS HEIGHTS PALOS HEIGHTS, IL · 15,500 people · Surface Water Purchased NORRIDGE NORRIDGE, IL · 15,251 people · Surface Water Purchased CAHOKIA HEIGHTS CAHOKIA HEIGHTS, IL · 15,250 people · Surface Water Purchased BETHALTO BETHALTO, IL · 15,210 people · Groundwater IL AMERICAN-LINCOLN GODFREY, IL · 15,200 people · GWUDI DIXON DIXON, IL · 15,096 people · Groundwater MACOMB MACOMB, IL · 15,051 people · Surface Water WILDWOOD SUBDIVISION - LAKE CO PW LIBERTYVILLE, IL · 14,832 people · Surface Water Purchased MIDLOTHIAN MIDLOTHIAN, IL · 14,819 people · Surface Water Purchased WASHINGTON WASHINGTON, IL · 14,793 people · Groundwater IL AMERICAN-STERLING GODFREY, IL · 14,782 people · Groundwater MORRIS MORRIS, IL · 14,775 people · Groundwater HICKORY HILLS HICKORY HILLS, IL · 14,505 people · Surface Water Purchased LINDENHURST LINDENHURST, IL · 14,500 people · Surface Water Purchased FOREST PARK FOREST PARK, IL · 14,340 people · Surface Water Purchased ANTIOCH ANTIOCH, IL · 14,175 people · Groundwater CHICAGO RIDGE CHICAGO RIDGE, IL · 14,130 people · Surface Water Purchased WAUCONDA WAUCONDA, IL · 14,084 people · Surface Water Purchased WOOD DALE WOOD DALE, IL · 14,012 people · Surface Water Purchased CASEYVILLE CASEYVILLE, IL · 13,798 people · Surface Water Purchased LINCOLNWOOD LINCOLONWOOD, IL · 13,463 people · Surface Water Purchased CHANNAHON CHANNAHON, IL · 13,380 people · Groundwater WESTERN SPRINGS WESTERN SPRINGS, IL · 13,274 people · Groundwater HAZEL CREST HAZEL CREST, IL · 13,098 people · Surface Water Purchased LA GRANGE PARK LAGRANGE PARK, IL · 13,011 people · Surface Water Purchased RANTOUL RANTOUL, IL · 13,000 people · Groundwater U OF I-CHAMPAIGN CHAMPAIGN, IL · 13,000 people · Groundwater Purchased NORTHLAKE NORTH LAKE, IL · 12,840 people · Surface Water Purchased TAYLORVILLE TAYLORVILLE, IL · 12,806 people · Surface Water MINOOKA MINOOKA, IL · 12,800 people · Groundwater JERSEY RWC JERSEYVILLE, IL · 12,750 people · Surface Water Purchased HERRIN HERRIN, IL · 12,747 people · Surface Water Purchased GLEN CARBON GLEN CARBON, IL · 12,618 people · Surface Water Purchased PLANO PLANO, IL · 12,600 people · Groundwater KEWANEE KEWANEE, IL · 12,509 people · Groundwater RICHTON PARK RICHTON PARK, IL · 12,504 people · Groundwater MARKHAM MARKHAM, IL · 12,500 people · Surface Water Purchased WINNETKA WINNETKA, IL · 12,475 people · Surface Water WARRENVILLE WARRENVILLE, IL · 12,350 people · Groundwater EFFINGHAM EFFINGHAM, IL · 12,252 people · Surface Water CENTRALIA CENTRALIA, IL · 12,182 people · Surface Water IL AMERICAN-PONTIAC GODFREY, IL · 11,864 people · Surface Water FOX LAKE INGLESIDE, IL · 11,780 people · Groundwater RIVER FOREST RIVER FOREST, IL · 11,717 people · Surface Water Purchased SCHILLER PARK SCHILLER PARK, IL · 11,709 people · Surface Water Purchased WASHINGTON COUNTY WATER COMPANY NASHVILLE, IL · 11,374 people · Surface Water Purchased LAKE OF EGYPT PWD MARION, IL · 11,368 people · Surface Water ROBINSON-PALESTINE WATER COMMISSION ROBINSON, IL · 11,331 people · Groundwater SUGAR GROVE SUGAR GROVE, IL · 11,243 people · Groundwater BURR RIDGE BURR RIDGE, IL · 11,192 people · Surface Water Purchased IL AMERICAN-CHICAGO SUBURBAN GODFREY, IL · 11,187 people · Surface Water Purchased COLUMBIA COLUMBIA, IL · 11,129 people · Surface Water Purchased WORTH WORTH, IL · 10,970 people · Surface Water Purchased SUMMIT SUMMIT, IL · 10,875 people · Surface Water Purchased CRESTWOOD CRESTWOOD, IL · 10,826 people · Surface Water Purchased HIGHLAND HIGHLAND, IL · 10,674 people · Surface Water WOOD RIVER WOOD RIVER, IL · 10,464 people · Groundwater PINGREE GROVE PINGREE GROVE, IL · 10,365 people · Groundwater MANHATTAN MANHATTAN, IL · 10,340 people · Groundwater BARRINGTON BARRINGTON, IL · 10,327 people · Groundwater LYONS LYONS, IL · 10,304 people · Surface Water Purchased PERU PERU, IL · 10,300 people · Groundwater RIVER GROVE RIVER GROVE, IL · 10,282 people · Surface Water Purchased RIVERDALE RIVERDALE, IL · 10,266 people · Surface Water Purchased MURPHYSBORO MURPHYSBORO, IL · 10,241 people · Surface Water Purchased WATERLOO WATERLOO, IL · 10,190 people · Groundwater MARYVILLE MARYVILLE, IL · 10,150 people · Groundwater LEYDEN TWSP WATER DISTRICT FRANKLIN PARK, IL · 10,000 people · Surface Water Purchased SAUK SAUK VILLAGE, IL · 9,921 people · Groundwater WINFIELD WINFIELD, IL · 9,835 people · Surface Water Purchased STEGER MANTENO, IL · 9,700 people · Groundwater LA SALLE LA SALLE, IL · 9,700 people · Groundwater CLARK-EDGAR RWD MARSHALL, IL · 9,657 people · Groundwater ITASCA ITASCA, IL · 9,506 people · Surface Water Purchased HARVARD HARVARD, IL · 9,469 people · Groundwater ROCHELLE ROCHELLE, IL · 9,446 people · Groundwater OAK BROOK OAK BROOK, IL · 9,400 people · Surface Water Purchased FLOSSMOOR FLOSSMOOR, IL · 9,371 people · Surface Water Purchased RIVERSIDE RIVERSIDE, IL · 9,298 people · Surface Water Purchased LYNWOOD LYNWOOD, IL · 9,149 people · Surface Water Purchased PARIS PARIS, IL · 9,100 people · Groundwater HARWOOD HEIGHTS HARDWOOD HEIGHTS, IL · 9,065 people · Surface Water Purchased WILLOWBROOK WILLOWBROOK, IL · 9,000 people · Surface Water Purchased GLENWOOD GLENWOOD, IL · 8,956 people · Surface Water Purchased MONMOUTH MONMOUTH, IL · 8,902 people · Groundwater CLEAR WATER SERVICE CORP MATTOON, IL · 8,900 people · Groundwater OLNEY OLNEY, IL · 8,877 people · Surface Water GLENCOE GLENCOE, IL · 8,849 people · Surface Water LAKE VILLA LAKE VILLA, IL · 8,829 people · Surface Water Purchased MASCOUTAH MASCOUTAH, IL · 8,759 people · Surface Water Purchased

Illinois Drinking Water: Frequently Asked Questions

Is Illinois tap water safe to drink?

Illinois has 1,784 community water systems regulated by the EPA serving a combined 12,123,368 people. Water quality varies by system — search above to find your specific utility and see its violation history, lead test results, and safety grade.

How many water systems are in Illinois?

There are 1,784 EPA-regulated community water systems in Illinois serving a combined 12,123,368 people. Each system is required to test for over 90 contaminants and publicly report any violations.

Does Illinois have PFAS in its drinking water?

PFAS (forever chemicals) have been detected in water systems across the country, including Illinois. The EPA finalized enforceable PFAS limits in 2024. Search for your specific water system above to see if PFAS were detected and whether levels exceed the new federal limits.

EPA data last updated: 2026-07-12