Water quality in Northbrook, Illinois
Northbrook 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 |
|---|---|---|---|---|
| Wheeling Wheeling |
39,725 | 0 | 5.5 mi | |
| Mission Brook SD |
2,852 | 1 | 7.0 mi | |
| Northbrook Northbrook |
34,200 | 2 | 7.1 mi | |
| Harbor Point Estates MHP Northbrook |
1,064 | 4 | 7.2 mi | |
| Sunrise Senior Living Prospect Heights |
82 | 1 | 7.2 mi | |
| Prospect Heights Prospect Heights |
2,280 | 1 | 7.7 mi | |
| IL American-Chicago Suburban |
11,187 | 0 | 7.8 mi | |
| Arlington Heights Arlington Heights |
73,320 | 3 | 8.2 mi | |
| Palatine Palatine |
70,875 | 0 | 8.5 mi | |
| Glencoe Forest Park |
8,849 | 0 | 9.9 mi | |
| Mount Prospect Mount Prospect |
41,000 | 3 | 10.2 mi | |
| Glenview Glenview |
47,856 | 2 | 10.2 mi | |
| Rolling Meadows Rolling Meadows |
23,329 | 3 | 10.4 mi | |
| Northfield Northfield |
5,751 | 1 | 10.4 mi | |
| Aqua Illinois-North Maine Utilities |
30,043 | 1 | 11.3 mi | |
| Winnetka Winnetka |
12,475 | 0 | 11.9 mi | |
| IL American-Waycinden |
1,934 | 0 | 12.0 mi | |
| Des Plaines Des Plaines |
60,675 | 3 | 12.0 mi | |
| Buckhorn Ranch Estates MHP Des Plaines |
702 | 0 | 12.0 mi | |
| Northwest Water Commission Des Plaines |
1 | 0 | 12.0 mi | |
| Golf Golf |
497 | 0 | 12.5 mi | |
| Willoway Terrace MHP |
900 | 0 | 12.8 mi | |
| Morton Grove Morton Grove |
25,297 | 3 | 13.4 mi | |
| Oasis MHP |
3,000 | 1 | 13.5 mi | |
| Des Plaines MHP |
405 | 2 | 13.5 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 Northbrook 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.