We found 25 public water systems in Codington county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Watertown Municipal Utilities | Watertown | 21,482 | 24 | 4 |
| Grant-roberts Rural Water System | Milbank | 4,857 | 0 | 2 |
| Sioux Rural Water System | Goodwin, Watertown | 4,000 | 0 | 0 |
| Clark Rural Water System | Clark, Florence | 2,130 | 0 | 34 |
| Sioux I Rural Water System (sioux) | County of Codington | 1,125 | 0 | 0 |
| K-bar-j Inc | County of Codington | 1,000 | 0 | 0 |
| Clark Rural Water-kampeska | Clark, Florence | 578 | 0 | 42 |
| Florence | Florence | 374 | 0 | 22 |
| Henry | Henry | 297 | 0 | 6 |
| South Shore | South Shore | 180 | 0 | 51 |
| Watertown Mobile Estates | County of Codington | 180 | 0 | 0 |
| Gfp 1-e/nw Pelican Picnic Area | County of Codington | 137 | 0 | 0 |
| Gfp 1-d/pelican Lake Rec Area | County of Codington | 103 | 0 | 0 |
| Owen Mobile Home Court | County of Codington | 100 | 0 | 0 |
| Gfp 1-h/w Pickerel Campground | Grenville | 100 | 0 | 0 |
| Macgregors | County of Codington | 100 | 0 | 0 |
| Pelican Plaza | Rancho Palos Verde, Watertown | 100 | 0 | 0 |
| Energy Industries | Watertown | 80 | 0 | 0 |
| Wallace | Wallace | 78 | 0 | 0 |
| South Fork Lounge | County of Codington | 50 | 0 | 0 |
| Stony Point Campground | County of Codington | 42 | 0 | 0 |
| Gfp 1-c/e Pickerel Campground | Grenville | 40 | 0 | 0 |
| Rauville Cafe | County of Codington | 25 | 0 | 0 |
| Gfp 1-g/w. Pickerel Shop | Grenville | 25 | 0 | 0 |
| Anderson Cafe | County of Codington | 25 | 0 | 0 |