Water quality in Marengo, Illinois
Marengo 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 |
|---|---|---|---|---|
| Union Union |
594 | 2 | 3.3 mi | |
| Woodstock Woodstock |
25,630 | 3 | 9.3 mi | |
| Huntley Huntley |
28,495 | 1 | 10.6 mi | |
| Lakewood Lakewood |
4,267 | 2 | 11.5 mi | |
| Harvard Harvard |
9,469 | 0 | 12.1 mi | |
| Royal Oaks MHP |
170 | 1 | 13.0 mi | |
| Lake in the Hills Lake In The Hills |
28,661 | 1 | 13.5 mi | |
| Crystal Lake Crystal Lake |
40,661 | 1 | 14.1 mi | |
| IL American-Walk UP Woods |
775 | 3 | 14.4 mi | |
| Wonder Lake |
3,870 | 2 | 14.6 mi | |
| Algonquin Algonquin |
30,700 | 0 | 15.8 mi | |
| Aqua Illinois-Crystal Clear Water Co. |
855 | 1 | 16.0 mi | |
| IL American-Terra Cotta |
681 | 0 | 16.2 mi | |
| Prairie Ridge Association |
148 | 0 | 16.6 mi | |
| Wonder Lake (niu) |
1,950 | 2 | 16.6 mi | |
| Oakbrook Estates MHP |
1,012 | 1 | 16.8 mi | |
| McHenry Mchenry |
22,335 | 2 | 17.5 mi | |
| Hebron Hebron |
1,368 | 2 | 17.6 mi | |
| IL American-Killarney |
1,232 | 0 | 17.8 mi | |
| Aqua Illinois-McHenry Shores |
1,862 | 0 | 18.2 mi | |
| Cary Cary |
17,826 | 1 | 18.4 mi | |
| IL American-Holiday Hills Holiday Hills |
868 | 0 | 19.3 mi | |
| Johnsburg No.2 |
1,124 | 3 | 19.4 mi | |
| Aqua Illinois-Eastwood Manor |
728 | 2 | 19.7 mi | |
| Aqua Illinois-Nunda |
485 | 0 | 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 Marengo 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.