COUNTY WATER-SYSTEM LEDGER
McHenry, Illinois
EPA’s September 2026 export lists 13 active community water systems serving McHenry, Illinois, with 2 current-violation flags and 0 serious-violator flags among the covered systems.
Source: EPA SDWIS system-search export · Active community systems serving 2,500+ people · Snapshot 13 Sep 2026
01 / SYSTEMS
Water systems serving McHenry, Illinois
EPA associates 13 covered systems with McHenry, Illinois; their reported population-served values total 232,488 and may overlap.
Ordered by reported population served. Open any record for separate health, monitoring, notice, other, and serious-violator flags.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| Crystal LakeIL1110150 | 40,661 | Ground water | No current violation flagged |
| AlgonquinIL1110050 | 30,700 | Ground water | No current violation flagged |
| Lake In The HillsIL1110400 | 28,661 | Ground water | No current violation flagged |
| HuntleyIL1110350 | 28,495 | Ground water | No current violation flagged |
| WoodstockIL1110950 | 25,630 | Ground water | No current violation flagged |
| MchenryIL1110600 | 22,335 | Ground water | No current violation flagged |
| CaryIL1110100 | 17,826 | Ground water | Other current violation flag |
| HarvardIL1110250 | 9,469 | Ground water | No current violation flagged |
| Prairie Path Water Co-Whispering HillsIL1115700 | 8,300 | Ground water | No current violation flagged |
| MarengoIL1110650 | 7,572 | Ground water | No current violation flagged |
| Fox River GroveIL1110200 | 4,702 | Ground water | No current violation flagged |
| LakewoodIL1115760 | 4,267 | Ground water | Other current violation flag |
| Wonder LakeIL1115750 | 3,870 | Ground water | No current violation flagged |
02 / SOURCE MIX
Primary water sources for McHenry, Illinois
EPA classifies 13 systems serving McHenry, Illinois across 1 primary-source categories; Ground water is the largest category with 13 systems.
It is the sum of each listed system's reported population served, not a census estimate. Service areas can overlap and some systems list multiple cities or counties.