Water quality in Oak Park, Illinois
Oak Park is in Cook County. 423 active public water systems serve the county; 220 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Cook County
162 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| River Grove River Grove |
10,282 | 1 | 1.5 mi | |
| Forest Park Forest Park |
14,340 | 2 | 1.8 mi | |
| Maywood Maywood |
24,090 | 4 | 2.7 mi | |
| Elmwood Park Elmwood Park |
25,000 | 2 | 2.8 mi | |
| Berwyn Berwyn |
57,250 | 3 | 3.0 mi | |
| Cicero Cicero |
83,000 | 4 | 3.3 mi | |
| Edward Hines JR V a Hospital |
60 | 2 | 3.4 mi | |
| Riverside Riverside |
9,298 | 1 | 3.4 mi | |
| River Forest River Forest |
11,717 | 2 | 3.4 mi | |
| Melrose Park Melrose Park |
24,206 | 0 | 3.7 mi | |
| Broadview Broadview |
7,847 | 4 | 3.9 mi | |
| Broadview-Westchester Joint Water Agency Broadview |
1 | 0 | 3.9 mi | |
| North Riverside North Riverside |
7,071 | 0 | 4.0 mi | |
| Hillside Berkeley Water Commission Bellwood |
1 | 0 | 4.4 mi | |
| Bellwood Bellwood |
19,156 | 4 | 4.6 mi | |
| Stone Park Stone Park |
4,576 | 1 | 4.6 mi | |
| Stickney Stickney |
6,902 | 2 | 5.1 mi | |
| Brookfield-North Riverside Water Comm. Brookfield |
1 | 0 | 5.2 mi | |
| Brookfield Brookfield |
18,776 | 0 | 5.4 mi | |
| Forest View Forest View |
800 | 2 | 5.4 mi | |
| Harwood Heights Harwood Heights |
9,065 | 0 | 5.5 mi | |
| Norridge Norridge |
15,251 | 0 | 5.6 mi | |
| LA Grange Park La Grange Park |
13,011 | 2 | 5.6 mi | |
| Leyden Twsp Water District |
10,000 | 0 | 5.6 mi | |
| Hillside Hillside |
8,200 | 0 | 5.7 mi |
Non-community systems in Cook County (260: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Cook County, nearest to Oak Park first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files or the centre of the town EPA lists the system as serving, from OpenStreetMap.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Illinois records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.