Water quality in McHenry, Illinois
McHenry is in McHenry County. 307 active public water systems serve the county; 73 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 McHenry County
31 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Aqua Illinois-McHenry Shores |
1,862 | 0 | 1.7 mi | |
| Aqua Illinois-Eastwood Manor |
728 | 2 | 2.2 mi | |
| Johnsburg No.2 |
1,124 | 3 | 3.4 mi | |
| IL American-Terra Cotta |
681 | 0 | 3.5 mi | |
| Harbor Lites-Pistakee Fshg CL |
132 | 2 | 4.0 mi | |
| IL American-Holiday Hills Holiday Hills |
868 | 0 | 4.3 mi | |
| Johnsburg 1 |
174 | 4 | 4.5 mi | |
| Wonder Lake (niu) |
1,950 | 2 | 4.8 mi | |
| IL American-Walk UP Woods |
775 | 3 | 4.8 mi | |
| Wonder Lake |
3,870 | 2 | 5.4 mi | |
| IL American-Whispering Hills |
8,300 | 4 | 5.5 mi | |
| Prairie Ridge Association |
148 | 0 | 6.3 mi | |
| IL American-Killarney |
1,232 | 0 | 6.3 mi | |
| Aqua Illinois-Nunda |
485 | 0 | 6.5 mi | |
| Royal Oaks MHP |
170 | 1 | 6.6 mi | |
| Crystal Lake Crystal Lake |
40,661 | 1 | 7.7 mi | |
| Aqua Illinois-Crystal Clear Water Co. |
855 | 1 | 7.8 mi | |
| Oakbrook Estates MHP |
1,012 | 1 | 8.0 mi | |
| Woodstock Woodstock |
25,630 | 3 | 8.4 mi | |
| Cary Cary |
17,826 | 1 | 8.6 mi | |
| Lakewood Lakewood |
4,267 | 2 | 9.5 mi | |
| Richmond Richmond |
2,089 | 0 | 9.8 mi | |
| Fox River Grove Fox River Grove |
4,702 | 0 | 10.0 mi | |
| Lake in the Hills Lake In The Hills |
28,661 | 1 | 10.8 mi | |
| Hebron Hebron |
1,368 | 2 | 12.2 mi |
Non-community systems in McHenry County (275: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to McHenry County, nearest to McHenry 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.