Illinois tap water quality
1,752 community water systems
6.3%
exceed lead action level
(109/1718 systems)
(109/1718 systems)
5.1%
PFOA/PFOS detected
(24/469 systems)
(24/469 systems)
Largest water systems
Lead is the LCR 90th-percentile result; a value above 0.015 mg/L exceeds the
EPA action level. “—” means no lead sample is on file for that system.
| System | City | Population | Lead (p90) |
|---|---|---|---|
| CHICAGO | 2,721,308 | 0.0130 mg/L | |
| AURORA | AURORA | 183,000 | 0.0184 mg/L |
| NAPERVILLE | NAPERVILLE | 156,406 | 0.0053 mg/L |
| IL AMERICAN-CHAMPAIGN | CHAMPAIGN | 150,000 | 0.0030 mg/L |
| ROCKFORD | ROCKFORD | 147,051 | 0.0140 mg/L |
| IL AMERICAN-PEORIA | PEORIA | 137,575 | 0.0145 mg/L |
| IL AMERICAN-EAST ST LOUIS | EAST ST LOUIS | 131,368 | 0.0082 mg/L |
| SPRINGFIELD | SPRINGFIELD | 117,444 | 0.0015 mg/L |
| ELGIN | ELGIN | 114,797 | 0.0230 mg/L |
| WAUKEGAN | WAUKEGAN | 87,149 | 0.0109 mg/L |
| CICERO | CICERO | 83,000 | 0.0090 mg/L |
| AQUA ILLINOIS-KANKAKEE | KANKAKEE | 80,000 | 0.0131 mg/L |
| BLOOMINGTON | BLOOMINGTON | 77,610 | 0.0068 mg/L |
| DECATUR | DECATUR | 76,122 | 0.0089 mg/L |
| SCHAUMBURG | SCHAUMBURG | 75,750 | 0.0037 mg/L |
| EVANSTON | EVANSTON | 74,486 | 0.0100 mg/L |
| IL AMERICAN-WEST SUBURBAN | BOLINGBROOK | 73,978 | 0.0078 mg/L |
| ARLINGTON HEIGHTS | ARLINGTON HEIGHTS | 73,320 | 0.0095 mg/L |
| PALATINE | PALATINE | 70,875 | 0.0162 mg/L |
| SKOKIE | SKOKIE | 66,422 | 0.0112 mg/L |
| DES PLAINES | DES PLAINES | 60,675 | 0.0080 mg/L |
| OAK LAWN | OAK LAWN | 58,362 | 0.0119 mg/L |
| ORLAND PARK | ORLAND PARK | 58,020 | 0.0075 mg/L |
| BERWYN | BERWYN | 57,250 | 0.0188 mg/L |
| TINLEY PARK | TINLEY PARK | 56,703 | 0.0082 mg/L |
| OAK PARK | OAK PARK | 54,583 | 0.0174 mg/L |
| WHEATON | WHEATON | 53,970 | 0.0014 mg/L |
| NORMAL | NORMAL | 52,736 | 0.0090 mg/L |
| ROMEOVILLE | ROMEOVILLE | 50,458 | 0.0083 mg/L |
| HOFFMAN ESTATES | HOFFMAN ESTATES | 50,179 | 0.0080 mg/L |
| PLAINFIELD | PLAINFIELD | 50,000 | 0.0146 mg/L |
| DOWNERS GROVE | DOWNERS GROVE | 49,425 | 0.0083 mg/L |
| GLENVIEW | GLENVIEW | 47,856 | 0.0148 mg/L |
| O FALLON | O FALLON | 46,603 | 0.0046 mg/L |
| IL AMERICAN-ALTON | ALTON | 46,127 | 0.0104 mg/L |
| ELMHURST | ELMHURST | 45,000 | 0.0119 mg/L |
| MOLINE | MOLINE | 44,500 | 0.0097 mg/L |
| LOMBARD | LOMBARD | 44,476 | 0.0140 mg/L |
| BUFFALO GROVE | BUFFALO GROVE | 43,212 | 0.0033 mg/L |
| QUINCY | QUINCY | 42,000 | 0.0064 mg/L |
| BARTLETT | BARTLETT | 41,500 | 0.0168 mg/L |
| MOUNT PROSPECT | MOUNT PROSPECT | 41,000 | 0.0041 mg/L |
| CRYSTAL LAKE | CRYSTAL LAKE | 40,661 | 0.0100 mg/L |
| DEKALB | DE KALB | 40,290 | 0.0120 mg/L |
| CAROL STREAM | CAROL STREAM | 39,854 | 0.0008 mg/L |
| PARK RIDGE | PARK RIDGE | 39,800 | 0.0140 mg/L |
| WHEELING | WHEELING | 39,725 | 0.0070 mg/L |
| STREAMWOOD | STREAMWOOD | 39,577 | 0.0000 mg/L |
| ROCK ISLAND | ROCK ISLAND | 39,018 | 0.0120 mg/L |
| OSWEGO | OSWEGO | 38,169 | 0.0040 mg/L |
| ADDISON | ADDISON | 38,017 | 0.0049 mg/L |
| CARPENTERSVILLE | CARPENTERSVILLE | 37,983 | 0.0103 mg/L |
| HANOVER PARK | HANOVER PARK | 37,470 | 0.0076 mg/L |
| CALUMET CITY | CALUMET CITY | 37,000 | 0.0155 mg/L |
| NORTH PARK PWD | MACHESNEY PARK | 35,580 | 0.0060 mg/L |
| NORTHBROOK | NORTHBROOK | 34,407 | 0.0158 mg/L |
| IL AMERICAN-GRANITE CITY | GRANITE CITY | 33,572 | 0.0088 mg/L |
| WOODRIDGE | WOODRIDGE | 33,566 | 0.0082 mg/L |
| GLENDALE HEIGHTS | GLENDALE HEIGHTS | 33,176 | 0.0065 mg/L |
| ST CHARLES | SAINT CHARLES | 33,103 | 0.0100 mg/L |
| ELK GROVE VILLAGE | ELK GROVE | 31,802 | 0.0061 mg/L |
| IL AMERICAN-PEKIN | PEKIN | 31,731 | 0.0080 mg/L |
| GALESBURG | GALESBURG | 31,620 | 0.0290 mg/L |
| MUNDELEIN | MUNDELEIN | 31,500 | 0.0071 mg/L |
| ALGONQUIN | ALGONQUIN | 30,700 | 0.0190 mg/L |
| GURNEE | GURNEE | 30,193 | 0.0018 mg/L |
| HIGHLAND PARK | HIGHLAND PARK | 30,176 | 0.0140 mg/L |
| AQUA ILLINOIS-VERMILION COUNTY | DANVILLE | 30,106 | 0.0097 mg/L |
| AQUA ILLINOIS-NORTH MAINE UTILITIES | 30,043 | 0.0130 mg/L | |
| SOUTH STICKNY SD | BURBANK (SOUTH STICKNEY) | 30,000 | 0.0141 mg/L |
| EJ WATER COOPERATIVE | 29,720 | 0.0072 mg/L | |
| COLLINSVILLE | COLLINSVILLE | 29,500 | 0.0010 mg/L |
| NILES | NILES | 29,350 | 0.0130 mg/L |
| LANSING | LANSING | 29,076 | 0.0145 mg/L |
| MONTGOMERY | MONTGOMERY | 28,956 | 0.0109 mg/L |
| GLEN ELLYN | GLEN ELLYN | 28,850 | 0.0079 mg/L |
| LAKE IN THE HILLS | LAKE IN THE HILLS | 28,661 | 0.0046 mg/L |
| HUNTLEY | HUNTLEY | 28,495 | 0.0128 mg/L |
| NEW LENOX | NEW LENOX | 27,690 | 0.0060 mg/L |
| OAK FOREST | OAK FOREST | 27,478 | 0.0085 mg/L |
| ROUND LAKE BEACH | ROUND LAKE BEACH | 27,200 | 0.0071 mg/L |
| WILMETTE | WILMETTE | 27,087 | 0.0144 mg/L |
| EDWARDSVILLE | EDWARDSVILLE | 26,808 | 0.0038 mg/L |
| CHICAGO HEIGHTS | CHICAGO HEIGHTS | 26,184 | 0.0095 mg/L |
| BATAVIA | BATAVIA | 26,098 | 0.0119 mg/L |
| WOODSTOCK | WOODSTOCK | 25,630 | 0.0115 mg/L |
| BELVIDERE | BELVIDERE | 25,339 | 0.0110 mg/L |
| MORTON GROVE | MORTON GROVE | 25,297 | 0.0122 mg/L |
| WEST CHICAGO | WEST CHICAGO | 25,166 | 0.0100 mg/L |
| ELMWOOD PARK | ELMWOOD PARK | 25,000 | 0.0166 mg/L |
| HARVEY | HARVEY | 25,000 | 0.0084 mg/L |
| IL AMERICAN-HOMER TOWNSHIP | 24,543 | 0.0010 mg/L | |
| ZION | ZION | 24,442 | 0.0107 mg/L |
| LISLE | LISLE | 24,223 | 0.0038 mg/L |
| MELROSE PARK | MELROSE PARK | 24,206 | 0.0108 mg/L |
| WESTMONT | WESTMONT | 24,161 | 0.0084 mg/L |
| MAYWOOD | MAYWOOD | 24,090 | 0.0127 mg/L |
| FRANKFORT | FRANKFORT | 24,000 | 0.0123 mg/L |
| FREEPORT | FREEPORT | 23,930 | 0.0080 mg/L |
| SOUTH ELGIN | SOUTH ELGIN | 23,648 | 0.0119 mg/L |