Water quality in Harmony, Illinois
Harmony 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
Other community water systems in McHenry County
31 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Union Union |
594 | 2 | 5.1 mi | |
| Marengo Marengo |
7,572 | 0 | 7.3 mi | |
| Lakewood Lakewood |
4,267 | 2 | 8.6 mi | |
| Lake in the Hills Lake In The Hills |
28,661 | 1 | 9.2 mi | |
| Algonquin Algonquin |
30,700 | 0 | 10.7 mi | |
| Royal Oaks MHP |
170 | 1 | 11.2 mi | |
| Crystal Lake Crystal Lake |
40,661 | 1 | 11.3 mi | |
| Woodstock Woodstock |
25,630 | 3 | 11.3 mi | |
| Aqua Illinois-Crystal Clear Water Co. |
855 | 1 | 12.8 mi | |
| IL American-Walk UP Woods |
775 | 3 | 13.0 mi | |
| Oakbrook Estates MHP |
1,012 | 1 | 13.4 mi | |
| Prairie Ridge Association |
148 | 0 | 14.0 mi | |
| Cary Cary |
17,826 | 1 | 14.9 mi | |
| IL American-Terra Cotta |
681 | 0 | 14.9 mi | |
| IL American-Killarney |
1,232 | 0 | 15.2 mi | |
| Wonder Lake |
3,870 | 2 | 16.8 mi | |
| Fox River Grove Fox River Grove |
4,702 | 0 | 16.9 mi | |
| Aqua Illinois-McHenry Shores |
1,862 | 0 | 17.5 mi | |
| McHenry Mchenry |
22,335 | 2 | 17.5 mi | |
| IL American-Holiday Hills Holiday Hills |
868 | 0 | 17.6 mi | |
| Aqua Illinois-Nunda |
485 | 0 | 17.8 mi | |
| Wonder Lake (niu) |
1,950 | 2 | 18.6 mi | |
| Harvard Harvard |
9,469 | 0 | 18.8 mi | |
| Aqua Illinois-Eastwood Manor |
728 | 2 | 19.5 mi | |
| Johnsburg No.2 |
1,124 | 3 | 20.3 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 Harmony 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.