St. Charles County, Missouri
11 active water systems in this county.
| Water System | Population Served | Source | Violations | Health-Based |
|---|---|---|---|---|
| Towne Park | 100 | Groundwater | 8 | 6 |
| Thies Farm | 25 | Groundwater | 6 | 2 |
| Portage Des Sioux Pws | 345 | Groundwater | 8 | 1 |
| Weldon Spring Heights Village Pws | 100 | Groundwater | 5 | 1 |
| St Charles Pws | 73,040 | Surface Water Purchased | 4 | 0 |
| St Charles Pwsd 2 Foristell | 550 | Groundwater | 4 | 0 |
| Ofallon Pws | 32,515 | Surface Water Purchased | 2 | 0 |
| St Peters Pws | 52,575 | Surface Water Purchased | 1 | 0 |
| Wentzville Pws | 41,784 | Groundwater | 1 | 0 |
| Ecm Water & Sewer Authority - Flint Hill | 469 | Groundwater | 1 | 0 |
| Mo American Jaxson | 535 | Groundwater | 0 | 0 |