Water quality in Oak Forest, Illinois
Oak Forest 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 |
|---|---|---|---|---|
| Midlothian Midlothian |
14,819 | 1 | 2.1 mi | |
| Markham Markham |
12,500 | 4 | 3.0 mi | |
| Crestwood Crestwood |
10,826 | 2 | 3.0 mi | |
| Country Club Hills Country Club Hills |
16,500 | 2 | 3.1 mi | |
| Robbins Robbins |
5,415 | 6 | 3.6 mi | |
| Hazel Crest Hazel Crest |
13,792 | 2 | 3.6 mi | |
| Posen Posen |
5,331 | 3 | 3.7 mi | |
| Tinley Park Tinley Park |
56,703 | 3 | 3.7 mi | |
| Dixmoor Dixmoor |
2,973 | 5 | 4.6 mi | |
| Alsip Alsip |
19,063 | 1 | 4.8 mi | |
| IL American-Fernway Westhaven |
5,521 | 0 | 4.9 mi | |
| Harvey Harvey |
25,000 | 2 | 5.0 mi | |
| IL American-Midwest Palos |
126 | 0 | 5.1 mi | |
| Blue Island Blue Island |
21,494 | 1 | 5.2 mi | |
| Palos Heights Palos Heights |
15,500 | 1 | 5.3 mi | |
| Homewood Homewood |
19,463 | 2 | 5.5 mi | |
| East Hazel Crest East Hazel Crest |
1,500 | 1 | 5.5 mi | |
| Flossmoor Flossmoor |
9,371 | 1 | 5.5 mi | |
| Worth Worth |
10,970 | 1 | 5.7 mi | |
| Garden Home SD |
1,472 | 1 | 5.7 mi | |
| Orland Park Orland Park |
58,020 | 1 | 5.8 mi | |
| Oak Lane MHC Merrionette Park |
388 | 0 | 6.0 mi | |
| Merrionette Park Merrionette Park |
1,969 | 2 | 6.1 mi | |
| Phoenix Phoenix |
1,994 | 4 | 6.1 mi | |
| Matteson Matteson |
18,293 | 5 | 6.4 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 Forest 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.