Mchenry County, Illinois
15 active water systems in this county.
| Water System | Population Served | Source | Violations | Health-Based |
|---|---|---|---|---|
| Algonquin | 30,700 | Groundwater | 5 | 2 |
| Fox River Grove | 4,702 | Groundwater | 4 | 2 |
| Hebron | 1,368 | Groundwater | 4 | 2 |
| Mchenry | 22,335 | Groundwater | 89 | 1 |
| Woodstock | 25,630 | Groundwater | 7 | 1 |
| Cary | 17,826 | Groundwater | 6 | 1 |
| Harvard | 9,469 | Groundwater | 2 | 1 |
| Huntley | 28,495 | Groundwater | 1 | 1 |
| Lakewood | 4,267 | Groundwater | 111 | 0 |
| Crystal Lake | 40,661 | Groundwater | 23 | 0 |
| Union | 594 | Groundwater | 12 | 0 |
| Richmond | 2,087 | Groundwater | 8 | 0 |
| Lake in the Hills | 28,661 | Groundwater | 4 | 0 |
| Marengo | 7,572 | Groundwater | 2 | 0 |
| Prairie Path Water Company-holiday Hills | 868 | Groundwater | 0 | 0 |