We found 20 public water systems in Mahaska county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Oskaloosa Municipal Water Dept | Oskaloosa | 12,173 | 38 | 25 |
| Mahaska Rural Water System, Inc. | Oskaloosa | 8,142 | 0 | 5 |
| New Sharon Water Supply | New Sharon | 1,293 | 0 | 10 |
| Cargill, Inc. (eddyville) | Eddyville | 1,025 | 0 | 0 |
| Mahaska Rural Water (fremont) | Fremont | 743 | 0 | 0 |
| Beacon Water Supply | Beacon | 504 | 0 | 12 |
| University Park Water Supply | County of Mahaska | 487 | 0 | 0 |
| Lake Keomah State Park | County of Mahaska | 415 | 0 | 0 |
| Rose Hill Water Supply | Rose Hill | 205 | 0 | 0 |
| Leighton Waterworks | Leighton | 153 | 0 | 0 |
| Christian Reformed Church | County of Mahaska | 150 | 0 | 0 |
| Lacey United Methodist Church | County of Mahaska | 145 | 0 | 0 |
| Cedar United Methodist Church | County of Mahaska | 140 | 0 | 0 |
| Union Mills Christian Church | County of Mahaska | 140 | 0 | 0 |
| Eddyville Generating Station | County of Mahaska | 100 | 0 | 0 |
| Mahaska County Home | County of Mahaska | 70 | 0 | 0 |
| Lower Grove Community Church | County of Mahaska | 50 | 0 | 0 |
| Oskaloosa Municipal Airport | County of Mahaska | 27 | 0 | 0 |
| Hedrick Y Cafe | County of Mahaska | 25 | 0 | 0 |
| Keomah Ymca Camp | County of Mahaska | 25 | 0 | 0 |