We found 11 public water systems in Lewis county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Canton | Canton | 2,377 | 0 | 9 |
| Lewis Co Pwsd 1 | Ewing | 1,688 | 0 | 1 |
| Lagrange | La Grange | 1,102 | 0 | 14 |
| La Belle | La Belle | 660 | 0 | 3 |
| Lewistown | Lewistown | 580 | 0 | 3 |
| River Valley Country Club | River Valley | 30 | 0 | 0 |
| Hester Baptist Church | Hester Baptist | 25 | 0 | 0 |
| Dover Baptist Church | Dover Baptist | 25 | 0 | 0 |
| South Union Baptist Church | County of Lewis | 25 | 0 | 0 |
| Wakonda State Park | Wakonda St Park | 25 | 0 | 0 |
| Deer Ridge Wildlife Area | Deer Ridge Area | 25 | 0 | 0 |