We found 9 public water systems in Deuel county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Brookings-deuel Rural Water System | Clear Lake, Toronto | 5,300 | 0 | 5 |
| Sioux Rural Water System | Goodwin, Watertown | 4,000 | 0 | 0 |
| Clear Lake | Clear Lake | 1,273 | 0 | 4 |
| Gary | Gary | 231 | 0 | 5 |
| Toronto Town Of | Toronto | 216 | 0 | 0 |
| Astoria | County of Deuel | 150 | 0 | 0 |
| Technical Ordnance | County of Deuel | 45 | 0 | 0 |
| Pleasant Valley Inc. | County of Deuel | 30 | 0 | 0 |
| Bernie's Place | County of Deuel | 25 | 0 | 0 |