Public Water Systems
5,117 active public water systems in IL, tracked from EPA's Safe Drinking Water Information System (SDWIS) across all 50 states. See our methodology.
| System Name | Location | Population | Violations | PFAS |
|---|---|---|---|---|
| Oswego | Oswego, IL | 38,169 | 285 | Clean |
| Addison | Addison, IL | 38,017 | 19 | Clean |
| Carpentersville | Carpentersville, IL | 37,983 | 17 | Clean |
| Hanover Park | Hanover Park, IL | 37,470 | 102 | Clean |
| Calumet City | Calumet City, IL | 37,000 | 64 | Detected |
| North Park Pwd | Machesney Park, IL | 35,580 | 33 | Detected |
| Elk Grove Village | Elk Grove Village, IL | 34,700 | 41 | Clean |
| Northbrook | Northbrook, IL | 34,407 | 25 | Clean |
| Woodridge | Woodridge, IL | 33,566 | 28 | Clean |
| Vernon Hills - Lake Co Pw | Libertyville, IL | 33,207 | 64 | Clean |
| Glendale Heights | Glendale Heights, IL | 33,176 | 24 | Clean |
| St Charles | St. Charles, IL | 33,103 | 37 | Detected |
| IL American-Pekin | Godfrey, IL | 31,731 | 5 | Detected |
| Galesburg | Galesburg, IL | 31,620 | 9 | Detected |
| Mundelein | Mundelein, IL | 31,500 | 77 | Clean |
| Algonquin | Algonquin, IL | 30,700 | 83 | Clean |
| Gurnee | Gurnee, IL | 30,193 | 68 | Clean |
| Highland Park | Highland Park, IL | 30,176 | 16 | Clean |
| Aqua Illinois-Vermilion County | Kankakee, IL | 30,106 | 131 | Detected |
| Aqua Illinois-North Maine Utilities | Kankakee, IL | 30,043 | 89 | Clean |
| South Stickny SD | Burbank, IL | 30,000 | 73 | Clean |
| Ej Water Cooperative | Dieterich, IL | 29,720 | 97 | Detected |
| Collinsville | Collinsville, IL | 29,500 | 55 | Detected |
| Niles | Niles, IL | 29,350 | 23 | Clean |
| Lansing | Lansing, IL | 29,076 | 33 | Clean |
| Montgomery | Montgomery, IL | 28,956 | 68 | Clean |
| Glen Ellyn | Glen Ellyn, IL | 28,850 | 18 | Clean |
| Lake in the Hills | Lake in the Hills, IL | 28,661 | 52 | Clean |
| Huntley | Huntley, IL | 28,495 | 84 | Clean |
| New Lenox | New Lenox, IL | 27,690 | 41 | Clean |
| IL American-Granite City | Godfrey, IL | 27,549 | 3 | Detected |
| Oak Forest | Oak Forest, IL | 27,478 | 24 | Detected |
| Round Lake Beach | Round Lake Beach, IL | 27,200 | 38 | Clean |
| Wilmette | Wilmette, IL | 27,087 | 26 | Clean |
| Edwardsville | Edwardsville, IL | 26,808 | 33 | Detected |
| Chicago Heights | Chicago Heights, IL | 26,184 | 40 | Clean |
| Batavia | Batavia, IL | 26,098 | 289 | Clean |
| Woodstock | Woodstock, IL | 25,630 | 35 | Clean |
| Morton Grove | Morton Grove, IL | 25,297 | 23 | Clean |
| West Chicago | West Chicago, IL | 25,166 | 148 | Clean |
| Belvidere | Belvidere, IL | 25,070 | 76 | Detected |
| Elmwood Park | Elmwood Park, IL | 25,000 | 39 | Clean |
| Harvey | Harvey, IL | 25,000 | 41 | Clean |
| IL American-Homer Township | Godfrey, IL | 24,543 | 2 | Clean |
| Zion | Zion, IL | 24,442 | 21 | Clean |
| Lisle | Lisle, IL | 24,233 | 23 | Clean |
| Melrose Park | Melrose Park, IL | 24,206 | 132 | Clean |
| Westmont | Westmont, IL | 24,161 | 37 | Clean |
| Maywood | Maywood, IL | 24,090 | 104 | Clean |
| Frankfort | Frankfort, IL | 24,000 | 91 | Clean |