Largest water suppliers
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 supplier.
| Supplier | City | Population | Lead (p90) |
|---|---|---|---|
| Chicago | Chicago | 2,721,308 | 0.0070 mg/L |
| Aurora | Aurora | 183,000 | 0.0240 mg/L |
| Naperville | Naperville | 156,406 | 0.0071 mg/L |
| Il American-Champaign | Champaign | 150,000 | 0.0010 mg/L |
| Rockford | Rockford | 147,051 | 0.0073 mg/L |
| Il American-Peoria | Peoria | 137,575 | 0.0090 mg/L |
| Il American-East St Louis | East St Louis | 131,368 | 0.0030 mg/L |
| Springfield | Springfield | 117,444 | 0.0000 mg/L |
| Elgin | Elgin | 114,797 | 0.0530 mg/L |
| Waukegan | Waukegan | 87,149 | 0.0090 mg/L |
| Cicero | Cicero | 83,000 | 0.0050 mg/L |
| Aqua Illinois-Kankakee | Kankakee | 80,000 | 0.0026 mg/L |
| Bloomington | Bloomington | 77,610 | 0.0051 mg/L |
| Decatur | Decatur | 76,122 | 0.0026 mg/L |
| Schaumburg | Schaumburg | 75,750 | 0.0014 mg/L |
| Evanston | Evanston | 74,486 | 0.0080 mg/L |
| Il American-West Suburban | Bolingbrook | 73,978 | 0.0000 mg/L |
| Arlington Heights | Arlington Heights | 73,320 | 0.0088 mg/L |
| Palatine | Palatine | 70,875 | 0.0075 mg/L |
| Skokie | Skokie | 66,422 | 0.0080 mg/L |
| Des Plaines | Des Plaines | 60,675 | 0.0111 mg/L |
| Oak Lawn | Oak Lawn | 58,362 | 0.0081 mg/L |
| Orland Park | Orland Park | 58,020 | 0.0000 mg/L |
| Berwyn | Berwyn | 57,250 | 0.0018 mg/L |
| Tinley Park | Tinley Park | 56,703 | 0.0000 mg/L |
| Oak Park | Oak Park | 54,583 | 0.0051 mg/L |
| Wheaton | Wheaton | 53,970 | 0.0015 mg/L |
| Normal | Normal | 52,736 | 0.0055 mg/L |
| Romeoville | Romeoville | 50,458 | 0.0082 mg/L |
| Hoffman Estates | Hoffman Estates | 50,179 | 0.0014 mg/L |
| Plainfield | Plainfield | 50,000 | 0.0000 mg/L |
| Downers Grove | Downers Grove | 49,425 | 0.0042 mg/L |
| Glenview | Glenview | 47,856 | 0.0098 mg/L |
| O Fallon | O Fallon | 46,603 | 0.0022 mg/L |
| Il American-Alton | Alton | 46,127 | 0.0030 mg/L |
| Elmhurst | Elmhurst | 45,000 | 0.0072 mg/L |
| Moline | Moline | 44,500 | 0.0040 mg/L |
| Lombard | Lombard | 44,476 | 0.0112 mg/L |
| Buffalo Grove | Buffalo Grove | 43,212 | 0.0000 mg/L |
| Quincy | Quincy | 42,000 | 0.0020 mg/L |
| Bartlett | Bartlett | 41,500 | 0.0226 mg/L |
| Mount Prospect | Mount Prospect | 41,000 | 0.0043 mg/L |
| Crystal Lake | Crystal Lake | 40,661 | 0.0077 mg/L |
| Dekalb | De Kalb | 40,290 | 0.0130 mg/L |
| Carol Stream | Carol Stream | 39,854 | 0.0008 mg/L |
| Park Ridge | Park Ridge | 39,800 | 0.0068 mg/L |
| Wheeling | Wheeling | 39,725 | 0.0013 mg/L |
| Streamwood | Streamwood | 39,577 | 0.0023 mg/L |
| Rock Island | Rock Island | 39,018 | 0.0056 mg/L |
| Oswego | Oswego | 38,169 | 0.0000 mg/L |
| Addison | Addison | 38,017 | 0.0047 mg/L |
| Carpentersville | Carpentersville | 37,983 | 0.0016 mg/L |
| Hanover Park | Hanover Park | 37,470 | 0.0015 mg/L |
| Calumet City | Calumet City | 37,000 | 0.0124 mg/L |
| North Park Pwd | Machesney Park | 35,580 | 0.0053 mg/L |
| Northbrook | Northbrook | 34,407 | 0.0110 mg/L |
| Il American-Granite City | Granite City | 33,572 | 0.0060 mg/L |
| Woodridge | Woodridge | 33,566 | 0.0018 mg/L |
| Glendale Heights | Glendale Heights | 33,176 | 0.0015 mg/L |
| St Charles | Saint Charles | 33,103 | 0.0033 mg/L |
| Elk Grove Village | Elk Grove | 31,802 | 0.0042 mg/L |
| Il American-Pekin | Pekin | 31,731 | 0.0010 mg/L |
| Galesburg | Galesburg | 31,620 | 0.0000 mg/L |
| Mundelein | Mundelein | 31,500 | 0.0074 mg/L |
| Algonquin | Algonquin | 30,700 | 0.0023 mg/L |
| Gurnee | Gurnee | 30,193 | 0.0003 mg/L |
| Highland Park | Highland Park | 30,176 | 0.0110 mg/L |
| Aqua Illinois-Vermilion County | Danville | 30,106 | 0.0080 mg/L |
| Aqua Illinois-North Maine Utilities | Glenview | 30,043 | 0.0011 mg/L |
| South Stickny Sd | Burbank (South Stickney) | 30,000 | 0.0037 mg/L |
| Ej Water Cooperative | — | 29,720 | 0.0020 mg/L |
| Collinsville | Collinsville | 29,500 | 0.0045 mg/L |
| Niles | Niles | 29,350 | 0.0099 mg/L |
| Lansing | Lansing | 29,076 | 0.0055 mg/L |
| Montgomery | Montgomery | 28,956 | 0.0000 mg/L |
| Glen Ellyn | Glen Ellyn | 28,850 | 0.0027 mg/L |
| Lake in the Hills | Lake in the Hills | 28,661 | 0.0027 mg/L |
| Huntley | Huntley | 28,495 | 0.0010 mg/L |
| New Lenox | New Lenox | 27,690 | 0.0000 mg/L |
| Oak Forest | Oak Forest | 27,478 | 0.0000 mg/L |
| Round Lake Beach | Round Lake Beach | 27,200 | 0.0046 mg/L |
| Wilmette | Wilmette | 27,087 | 0.0099 mg/L |
| Edwardsville | Edwardsville | 26,808 | 0.0000 mg/L |
| Chicago Heights | Chicago Heights | 26,184 | 0.0059 mg/L |
| Batavia | Batavia | 26,098 | 0.0038 mg/L |
| Woodstock | Woodstock | 25,630 | 0.0070 mg/L |
| Belvidere | Belvidere | 25,339 | 0.0018 mg/L |
| Morton Grove | Morton Grove | 25,297 | 0.0176 mg/L |
| West Chicago | West Chicago | 25,166 | 0.0009 mg/L |
| Elmwood Park | Elmwood Park | 25,000 | 0.0030 mg/L |
| Harvey | Harvey | 25,000 | 0.0022 mg/L |
| Il American-Homer Township | — | 24,543 | 0.0000 mg/L |
| Zion | Zion | 24,442 | 0.0091 mg/L |
| Lisle | Lisle | 24,223 | 0.0000 mg/L |
| Melrose Park | Melrose Park | 24,206 | 0.0056 mg/L |
| Westmont | Westmont | 24,161 | 0.0083 mg/L |
| Maywood | Maywood | 24,090 | 0.0054 mg/L |
| Frankfort | Frankfort | 24,000 | 0.0010 mg/L |
| Freeport | Freeport | 23,930 | 0.0120 mg/L |
| South Elgin | South Elgin | 23,648 | 0.0014 mg/L |