We found 6 public water systems in Mellette county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Tripp County Water User District | Hamill, Winner | 4,765 | 0 | 57 |
| White River | Valentine, White River | 581 | 40 | 24 |
| WR/LJ - MELLETTE WEST PROJECT | County of Mellette | 110 | 0 | 0 |
| WR/LJ - MELLETTE EAST | County of Mellette | 108 | 0 | 0 |
| Wood | County of Mellette | 88 | 0 | 0 |
| Norris Elementary School | County of Mellette | 73 | 0 | 0 |