We found 42 public water systems in Roberts county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Grant-roberts Rural Water System | Milbank | 4,857 | 0 | 2 |
| Sisseton | Sisseton | 2,470 | 0 | 5 |
| Coffee Cup Fuel Stop #1 | Summit | 1,250 | 0 | 0 |
| Dot Rest Area - Whetstone Valley | Pierre, Sisseton, Wilmot | 1,000 | 0 | 2 |
| Dot Rest Area 119 - Glacial Lakes | Pierre, Rosholt | 1,000 | 0 | 2 |
| Wilmot | Wilmot | 492 | 0 | 55 |
| Rosholt | Rosholt | 408 | 0 | 147 |
| Lake Traverse Utility Comm | Old Agency | 390 | 0 | 0 |
| Summit | Summit | 288 | 0 | 59 |
| Gfp 13-11/hartford Beach Pa W? | County of Roberts | 275 | 0 | 0 |
| Gfp 13-26/hartford Beach Shop? | County of Roberts | 275 | 0 | 0 |
| New Effington | New Effington | 256 | 0 | 20 |
| Peever | Britton, Peever | 168 | 0 | 10 |
| Lake Traverse Utility Comm | Enemy Swim | 130 | 0 | 0 |
| Westline Water/golf Course | County of Roberts | 110 | 0 | 0 |
| White Rock Colony | Aberdeen, Rosholt | 100 | 0 | 0 |
| Lake Traverse Utility Comm. | New Effington | 90 | 0 | 0 |
| Heuer's Resort Rrt 2 Box 136 | County of Roberts | 90 | 0 | 0 |
| Corona | Corona | 82 | 0 | 0 |
| Schmidt's Landing | Big Stone City | 75 | 0 | 0 |
| Linden Beach Resort | County of Roberts | 70 | 0 | 0 |
| Victor Supper Club | County of Roberts | 65 | 0 | 0 |
| Lake Traverse Utility Comm | Finley Heights | 60 | 0 | 0 |
| Farmer's Inn Cafe | County of Roberts | 50 | 0 | 0 |
| Lake Traverse Utility Comm | Red Iron Lake | 50 | 0 | 0 |
| Lake Traverse Utility Comm | Big Coulee | 50 | 0 | 0 |
| Hunters Ii | Sisseton | 50 | 0 | 0 |
| Claire City Elementary School | Claire City | 45 | 0 | 0 |
| Valley View Country Club | County of Roberts | 40 | 0 | 0 |
| Sodak Park Supper Club | County of Roberts | 40 | 0 | 0 |
| Lake Traverse Utility Comm | Long Hollow | 40 | 0 | 0 |
| Hartford Beach Resort | Hartford Beach | 36 | 0 | 0 |
| Cadillac Ranch | County of Roberts | 32 | 0 | 0 |
| Ortley Cafe | Ortley | 30 | 0 | 0 |
| Circle K Resort | County of Roberts | 29 | 0 | 0 |
| Dot Rest Area 106-rich Park | County of Roberts | 26 | 0 | 0 |
| Bay View Resort | County of Roberts | 25 | 0 | 0 |
| Dot Rest Area 107-mertz | Bowdle | 25 | 0 | 0 |
| Sodak Park Lake Association | County of Roberts | 25 | 0 | 0 |
| Cottonwood Point Resort | County of Roberts | 25 | 0 | 0 |
| Schuler's Resort | Schulers Resort | 16 | 0 | 0 |
| Westline Water/porter Landing | County of Roberts | 8 | 0 | 0 |