Water quality in Algonquin, Illinois
Algonquin 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 |
|---|---|---|---|---|
| Lake in the Hills Lake In The Hills |
28,661 | 1 | 2.6 mi | |
| Aqua Illinois-Crystal Clear Water Co. |
855 | 1 | 4.5 mi | |
| Oakbrook Estates MHP |
1,012 | 1 | 4.6 mi | |
| Crystal Lake Crystal Lake |
40,661 | 1 | 4.8 mi | |
| Cary Cary |
17,826 | 1 | 5.2 mi | |
| Lakewood Lakewood |
4,267 | 2 | 5.3 mi | |
| Huntley Huntley |
28,495 | 1 | 5.8 mi | |
| Prairie Ridge Association |
148 | 0 | 6.1 mi | |
| Fox River Grove Fox River Grove |
4,702 | 0 | 6.6 mi | |
| Royal Oaks MHP |
170 | 1 | 6.7 mi | |
| IL American-Killarney |
1,232 | 0 | 6.8 mi | |
| IL American-Walk UP Woods |
775 | 3 | 7.8 mi | |
| IL American-Terra Cotta |
681 | 0 | 8.8 mi | |
| Aqua Illinois-Nunda |
485 | 0 | 8.9 mi | |
| IL American-Holiday Hills Holiday Hills |
868 | 0 | 9.8 mi | |
| Aqua Illinois-McHenry Shores |
1,862 | 0 | 11.2 mi | |
| Woodstock Woodstock |
25,630 | 3 | 12.2 mi | |
| McHenry Mchenry |
22,335 | 2 | 12.3 mi | |
| Union Union |
594 | 2 | 12.5 mi | |
| Aqua Illinois-Eastwood Manor |
728 | 2 | 13.5 mi | |
| Harbor Lites-Pistakee Fshg CL |
132 | 2 | 15.0 mi | |
| Wonder Lake |
3,870 | 2 | 15.0 mi | |
| Johnsburg No.2 |
1,124 | 3 | 15.6 mi | |
| Marengo Marengo |
7,572 | 0 | 15.8 mi | |
| Wonder Lake (niu) |
1,950 | 2 | 15.9 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 Algonquin 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.