Water quality in Oak Brook, Illinois
Oak Brook is in DuPage County. 208 active public water systems serve the county; 46 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 DuPage County
47 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Oak Brook Oak Brook |
9,400 | 3 | 0.7 mi | |
| Oakbrook Terrace Oak Brook Terr |
1,440 | 0 | 0.7 mi | |
| York Township Water System Oak Brook Terr |
1,423 | 1 | 0.7 mi | |
| Liberty Park Homeowners Association |
950 | 3 | 2.3 mi | |
| Villa Park Villa Park |
22,263 | 0 | 2.9 mi | |
| DU Page Water Commission |
1 | 0 | 3.2 mi | |
| Clarendon Hills Clarendon Hills |
8,702 | 1 | 3.3 mi | |
| Lombard Lombard |
44,476 | 2 | 3.3 mi | |
| Westmont Westmont |
24,161 | 0 | 3.4 mi | |
| Hinsdale Hinsdale |
17,900 | 1 | 3.5 mi | |
| Elmhurst Elmhurst |
45,000 | 0 | 3.9 mi | |
| IL American-Clarendon |
625 | 2 | 4.1 mi | |
| Downers Grove Downers Grove |
49,425 | 0 | 4.4 mi | |
| IL American-Lombard Heights Lombard |
679 | 0 | 4.6 mi | |
| IL American-Valley View |
6,721 | 0 | 4.7 mi | |
| Glen Ellyn Glen Ellyn |
28,500 | 1 | 5.3 mi | |
| Willowbrook Willowbrook |
9,000 | 3 | 5.5 mi | |
| IL American-Country Club |
1,014 | 0 | 6.1 mi | |
| Glen Ellyn Heights Subdivision |
1,931 | 4 | 6.3 mi | |
| Addison Addison |
38,017 | 1 | 6.4 mi | |
| Lisle Lisle |
24,223 | 1 | 6.6 mi | |
| Darien Darien |
21,751 | 1 | 6.7 mi | |
| IL American-Dupage Utility |
6,613 | 0 | 6.8 mi | |
| IL American-Liberty Ridge East Wheaton |
320 | 0 | 7.1 mi | |
| Burr Ridge Burr Ridge |
11,192 | 1 | 7.2 mi |
Non-community systems in DuPage County (160: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to DuPage County, nearest to Oak Brook 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.
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.