We found 14 public water systems that could serve the same population as Oahe Plains Systems Corporation (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Pierre | Pierre | 13,938 | 56 | 6 |
| Mid-dakota Rural Water | Miller, Pierre | 10,200 | 30 | 1 |
| Dot Rest Area - Whetstone Valley | Pierre, Sisseton, Wilmot | 1,000 | 0 | 2 |
| Dot Rest Area 119 - Glacial Lakes | Pierre, Rosholt | 1,000 | 0 | 2 |
| Dot Rest Area 504-505a-tilford | Pierre, Rapid City | 400 | 0 | 0 |
| Spring Creek Sanitary District | Pierre | 380 | 0 | 28 |
| Dot Rest Area 517a-spearfish | Pierre, Rapid City | 300 | 0 | 8 |
| Gfp-west Bend Recreation Area | Pierre | 125 | 0 | 19 |
| Dell Acres Mobile Home Park | Pierre | 100 | 0 | 0 |
| Oahe Acres | Miller, Pierre | 93 | 0 | 0 |
| Coe-lk O/little Bend Rec Area | Pierre | 50 | 0 | 0 |
| Sunset Lodge | Pierre | 35 | 0 | 0 |
| Coe-lk O/cow Creek Rec Area | Pierre | 25 | 0 | 0 |
| Coe-lk O/downstream Tailrace E | Pierre | 25 | 0 | 0 |