We found 8 public water systems in Walworth county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Web Water Development Association | Aberdeen, Eureka | 14,000 | 39 | 4 |
| Mobridge | Mobridge | 3,465 | 0 | 21 |
| Selby | Selby | 642 | 0 | 24 |
| Oahe Koa Campground | County of Walworth | 160 | 0 | 0 |
| Glenham | County of Walworth | 139 | 0 | 0 |
| Java | Java | 129 | 0 | 17 |
| Gfp 17-f/lk Faulkton Rec Area | County of Walworth | 100 | 0 | 0 |
| Coe-lk O/west Pollock S Rec Ar | Mobridge | 50 | 0 | 0 |