Cook County, Illinois
132 active water systems in this county.
| Water System | Population Served | Source | Violations | Health-Based |
|---|---|---|---|---|
| Lemont | 17,500 | Groundwater | 17 | 10 |
| South Holland | 22,000 | Surface Water Purchased | 23 | 8 |
| Bartlett | 41,500 | Surface Water Purchased | 6 | 5 |
| Phoenix | 1,994 | Surface Water Purchased | 66 | 4 |
| Ford Heights | 1,813 | Surface Water Purchased | 26 | 4 |
| Riverside | 9,298 | Surface Water Purchased | 9 | 4 |
| Lyons | 10,304 | Surface Water Purchased | 7 | 4 |
| North Riverside | 7,071 | Surface Water Purchased | 7 | 4 |
| Dixmoor | 2,973 | Surface Water Purchased | 25 | 3 |
| Berwyn | 57,250 | Surface Water Purchased | 17 | 3 |
| Steger | 9,700 | Groundwater | 14 | 3 |
| Broadview | 7,847 | Surface Water Purchased | 12 | 3 |
| Bellwood | 19,156 | Surface Water Purchased | 10 | 3 |
| Schiller Park | 11,709 | Surface Water Purchased | 8 | 3 |
| Riverdale | 10,266 | Surface Water Purchased | 6 | 3 |
| Richton Park | 12,504 | Groundwater | 193 | 2 |
| Calumet City | 37,000 | Surface Water Purchased | 14 | 2 |
| Cicero | 83,000 | Surface Water Purchased | 13 | 2 |
| Homewood | 19,463 | Surface Water Purchased | 13 | 2 |
| Westchester | 16,241 | Surface Water Purchased | 13 | 2 |
| Oak Lawn | 58,362 | Surface Water Purchased | 11 | 2 |
| Posen | 5,331 | Surface Water Purchased | 11 | 2 |
| Morton Grove | 25,297 | Surface Water Purchased | 7 | 2 |
| Glenview | 47,856 | Surface Water Purchased | 6 | 2 |
| East Hazel Crest | 1,500 | Surface Water Purchased | 6 | 2 |
| Palatine | 70,875 | Surface Water Purchased | 4 | 2 |
| Wheeling | 39,725 | Surface Water Purchased | 4 | 2 |
| Oak Park | 54,583 | Surface Water Purchased | 2 | 2 |
| Park Forest | 21,975 | Groundwater | 134 | 1 |
| Stickney | 6,902 | Surface Water Purchased | 40 | 1 |
| Burnham | 3,989 | Surface Water Purchased | 25 | 1 |
| Maywood | 24,090 | Surface Water Purchased | 22 | 1 |
| Park Ridge | 39,800 | Surface Water Purchased | 18 | 1 |
| Calumet Park | 8,442 | Surface Water Purchased | 15 | 1 |
| Blue Island | 21,494 | Surface Water Purchased | 14 | 1 |
| Melrose Park | 24,206 | Surface Water Purchased | 9 | 1 |
| Northbrook | 34,407 | Surface Water | 7 | 1 |
| Hazel Crest | 13,098 | Surface Water Purchased | 7 | 1 |
| Harwood Heights | 9,065 | Surface Water Purchased | 7 | 1 |
| Midlothian | 14,819 | Surface Water Purchased | 6 | 1 |
| River Grove | 10,282 | Surface Water Purchased | 5 | 1 |
| South Stickny Sd | 30,000 | Surface Water Purchased | 4 | 1 |
| Lincolnwood | 13,463 | Surface Water Purchased | 4 | 1 |
| River Forest | 11,717 | Surface Water Purchased | 4 | 1 |
| Worth | 10,970 | Surface Water Purchased | 4 | 1 |
| Prospect Heights | 2,280 | Surface Water Purchased | 4 | 1 |
| Elmwood Park | 25,000 | Surface Water Purchased | 3 | 1 |
| La Grange Park | 13,011 | Surface Water Purchased | 3 | 1 |
| Northfield | 5,470 | Surface Water Purchased | 3 | 1 |
| Berkeley | 5,214 | Surface Water Purchased | 3 | 1 |
| South Chicago Heights | 3,924 | Surface Water Purchased | 3 | 1 |
| Evanston | 74,486 | Surface Water | 1 | 1 |
| Sauk | 9,921 | Groundwater | 556 | 0 |
| Robbins | 5,415 | Surface Water Purchased | 77 | 0 |
| Arlington Heights | 73,320 | Surface Water Purchased | 45 | 0 |
| Crestwood | 10,826 | Surface Water Purchased | 42 | 0 |
| Dolton | 20,510 | Surface Water Purchased | 35 | 0 |
| Sterling Estates Mhp | 1,954 | Surface Water Purchased | 34 | 0 |
| Mount Prospect | 41,000 | Surface Water Purchased | 31 | 0 |
| Matteson | 18,293 | Surface Water Purchased | 30 | 0 |
| Alpine Village Mhp | 994 | Surface Water Purchased | 26 | 0 |
| Olympia Fields | 4,922 | Surface Water Purchased | 23 | 0 |
| Western Springs | 13,274 | Groundwater | 20 | 0 |
| Markham | 12,500 | Surface Water Purchased | 20 | 0 |
| Merrionette Park | 1,969 | Surface Water Purchased | 18 | 0 |
| Harbor Point Estates Mhp | 950 | Surface Water Purchased | 17 | 0 |
| Skokie | 66,422 | Surface Water Purchased | 16 | 0 |
| Glenwood | 8,956 | Surface Water Purchased | 16 | 0 |
| Lansing | 29,076 | Surface Water Purchased | 14 | 0 |
| Chicago Heights | 26,184 | Surface Water Purchased | 14 | 0 |
| Summit | 10,875 | Surface Water Purchased | 14 | 0 |
| Hanover Park | 37,470 | Surface Water Purchased | 13 | 0 |
| Franklin Park | 18,467 | Surface Water Purchased | 12 | 0 |
| Schaumburg | 75,750 | Surface Water Purchased | 11 | 0 |
| Oak Forest | 27,478 | Surface Water Purchased | 11 | 0 |
| Stone Park | 4,576 | Surface Water Purchased | 11 | 0 |
| Indian Head Park | 3,240 | Surface Water Purchased | 11 | 0 |
| Lynwood | 9,149 | Surface Water Purchased | 10 | 0 |
| Rolling Meadows | 23,329 | Surface Water Purchased | 9 | 0 |
| Buffalo Grove | 43,212 | Surface Water Purchased | 8 | 0 |
| Flossmoor | 9,371 | Surface Water Purchased | 8 | 0 |
| Tinley Park | 56,703 | Surface Water Purchased | 7 | 0 |
| Harvey | 25,000 | Surface Water Purchased | 7 | 0 |
| Northlake | 12,840 | Surface Water Purchased | 7 | 0 |
| Thornton | 2,333 | Surface Water Purchased | 7 | 0 |
| Hodgkins | 1,472 | Surface Water Purchased | 7 | 0 |
| Golf | 497 | Surface Water Purchased | 7 | 0 |
| Brookfield | 18,776 | Surface Water Purchased | 6 | 0 |
| Country Club Hills | 16,500 | Surface Water Purchased | 6 | 0 |
| La Grange Estates Mhp | 440 | Surface Water Purchased | 6 | 0 |
| Streamwood | 39,577 | Surface Water Purchased | 5 | 0 |
| Alsip | 19,063 | Surface Water Purchased | 5 | 0 |
| Justice-willow Springs Water Commission | 18,457 | Surface Water Purchased | 5 | 0 |
| La Grange | 16,200 | Surface Water Purchased | 5 | 0 |
| Hometown | 4,240 | Surface Water Purchased | 5 | 0 |
| Sunrise Senior Living | 100 | Groundwater | 5 | 0 |
| Des Plaines | 60,675 | Surface Water Purchased | 4 | 0 |
| Elk Grove Village | 34,700 | Surface Water Purchased | 4 | 0 |
| Niles | 29,350 | Surface Water Purchased | 3 | 0 |
| Forest Park | 14,340 | Surface Water Purchased | 3 | 0 |
| Hillside | 8,200 | Surface Water Purchased | 3 | 0 |
| Rosemont | 3,952 | Surface Water Purchased | 3 | 0 |
| Kenilworth | 2,514 | Surface Water Purchased | 3 | 0 |
| Orland Park | 58,862 | Surface Water Purchased | 2 | 0 |
| Palos Hills | 18,530 | Surface Water Purchased | 2 | 0 |
| Palos Heights | 15,500 | Surface Water Purchased | 2 | 0 |
| Chicago Ridge | 14,130 | Surface Water Purchased | 2 | 0 |
| Countryside | 6,420 | Surface Water Purchased | 2 | 0 |
| Mc Cook | 280 | Surface Water Purchased | 2 | 0 |
| Wilmette | 27,087 | Surface Water | 1 | 0 |
| Evergreen Park | 19,943 | Surface Water Purchased | 1 | 0 |
| Bridgeview | 16,467 | Surface Water Purchased | 1 | 0 |
| Norridge | 15,251 | Surface Water Purchased | 1 | 0 |
| Winnetka | 12,475 | Surface Water | 1 | 0 |
| Palos Park | 4,873 | Surface Water Purchased | 1 | 0 |
| Forest View | 800 | Surface Water Purchased | 1 | 0 |
| Franciscan Sisters of Chicago | 505 | Groundwater Purchased | 1 | 0 |
| Oak Lane Mhc | 388 | Surface Water Purchased | 1 | 0 |
| Hoffman Estates | 50,179 | Surface Water Purchased | 0 | 0 |
| Hickory Hills | 14,505 | Surface Water Purchased | 0 | 0 |
| Glencoe | 8,849 | Surface Water | 0 | 0 |
| Il American-fernway | 5,223 | Surface Water Purchased | 0 | 0 |
| Aqua Illinois-timber Ridge | 2,322 | Groundwater Purchased | 0 | 0 |
| River Oaks Estates Mhp | 677 | Surface Water Purchased | 0 | 0 |
| Bedford Park | 602 | Surface Water Purchased | 0 | 0 |
| Weatherstone Lakes Mhp | 221 | Groundwater Purchased | 0 | 0 |
| Aqua Illinois-summerdale | 145 | Surface Water Purchased | 0 | 0 |
| Brookfield-north Riverside Water Comm. | 1 | Surface Water Purchased | 0 | 0 |
| Northwest Water Commission | 1 | Surface Water Purchased | 0 | 0 |
| Hillside Berkeley Water Commission | 1 | Surface Water Purchased | 0 | 0 |
| Broadview-westchester Joint Water Agency | 1 | Surface Water Purchased | 0 | 0 |
| Morton Grove - Niles Water Commission | 0 | Surface Water Purchased | 0 | 0 |