South Dakota tap water, by utility.
59 utilities with a full report, serving 729,199 people as they report it. Regulated PFAS turned up at 2 of them.
All 59, by people served
| Utility | Based in | Serves | Regulated PFAS | Health-based violations since 2016 |
|---|---|---|---|---|
| Sioux Falls | Sioux Falls | 216,462 | None found | 0 |
| Rapid City | Rapid City | 72,009 | PFHxS | 0 |
| Aberdeen | Aberdeen | 27,989 | None found | 7 |
| Brookings Municipal Utilities | Brookings | 23,377 | None found | 1 |
| Watertown Municipal Utilities | Watertown | 23,230 | None found | 1 |
| Web Water Development Association | Aberdeen | 20,750 | None found | 0 |
| Mitchell | Mitchell | 15,651 | None found | 0 |
| Yankton | Yankton | 15,411 | None found | 5 |
| Huron | Huron | 14,263 | None found | 0 |
| Pierre | Pierre | 14,091 | None found | 0 |
| Box Elder | Box Elder | 14,000 | None found | 9 |
| Spearfish | Spearfish | 13,803 | None found | 0 |
| Minnehaha Community Water Corp | Dell Rapids | 13,435 | None found | 0 |
| By Water District | Tabor | 13,320 | None found | 2 |
| Mid - Dakota Rural Water | Miller | 11,833 | None found | 0 |
| Vermillion | Vermillion | 11,695 | None found | 0 |
| Rapid Valley Sanitary District | Rapid City | 11,408 | PFOS, PFHxS | 0 |
| Brandon | Brandon | 11,048 | None found | 0 |
| Harrisburg | Harrisburg | 10,297 | None found | 0 |
| Ellsworth AFB | Ellsworth AFB | 9,100 | None found | 0 |
| Pine Ridge Water System | Pine Ridge | 7,482 | None found | 2 |
| Tea | Tea | 7,381 | None found | 0 |
| Sturgis | Sturgis | 7,020 | None found | 0 |
| Kyle Water System | Pine Ridge | 6,526 | None found | 1 |
| Kingbrook I Rural Water System | Arlington | 6,455 | None found | 0 |
| Randall Community Water District | Lake Andes | 6,248 | None found | 0 |
| Brookings - Deuel Rural Water System | Toronto | 6,200 | None found | 0 |
| Madison | Madison | 6,191 | None found | 0 |
| Lincoln County Rural Water System | Sioux Falls | 5,965 | None found | 0 |
| Big Sioux Community Water System | Egan | 5,800 | None found | 0 |
| Brown - Day - Marshall RWS | Britton | 5,673 | None found | 0 |
| Belle Fourche | Belle Fourche | 5,617 | None found | 0 |
| Sicangu Mni Wiconi Rural Water System | Rosebud | 5,610 | None found | 1 |
| Rosebud Rural Water System | Rosebud | 5,500 | None found | 2 |
| South Lincoln Rural Water System | Beresford | 5,250 | None found | 0 |
| Grant - Roberts Rural Water System | Milbank | 5,050 | None found | 0 |
| Tripp County Water User District | Winner | 4,860 | None found | 0 |
| Clay Rural Water System | Wakonda | 4,780 | None found | 0 |
| Wr/Lj - Mni Wiconi | Murdo | 4,720 | None found | 0 |
| Black Hawk Water User District | Black Hawk | 4,500 | None found | 1 |
| Sioux Rural Water System | Watertown | 4,280 | None found | 1 |
| Tm Rural Water District | Parker | 4,250 | None found | 0 |
| Eagle Butte | Eagle Butte | 4,000 | None found | 2 |
| Dakota Dunes Cid | Dakota Dunes | 3,700 | Not sampled | 0 |
| Dell Rapids | Dell Rapids | 3,633 | None found | 0 |
| Oglala RWS Pipeline | Pine Ridge | 3,562 | None found | 1 |
| Milbank | Milbank | 3,544 | Not sampled | 0 |
| Davison Rural Water System Inc | Mitchell | 3,485 | Not sampled | 0 |
| Hartford | Hartford | 3,396 | Not sampled | 0 |
| Hot Springs | Hot Springs | 3,395 | None found | 0 |
| Mobridge | Mobridge | 3,261 | None found | 0 |
| St. Francis | Rosebud | 2,450 | None found | 1 |
| Tri - County Rural Water System | Eagle Butte | 2,190 | None found | 0 |
| Mission Water System | Mission | 1,500 | None found | 0 |
| Philip | Philip | 759 | None found | 0 |
| Wall | Wall | 699 | None found | 0 |
| Sun Valley Development | Rapid City | 650 | None found | 0 |
| Tmt, Inc. | Pierre | 250 | None found | 0 |
| Rendezvous Ranch | Black Hawk | 195 | None found | 0 |
Utilities EPA sampled under UCMR 5, plus any other community system serving 3,300 people or more. Smaller systems appear in ZIP code results. People served is what each utility reports to EPA. Data: EPA SDWIS 2026 Q2 and UCMR 5.
Where to go next
Read your utility’s own report
It lists nitrate, arsenic and byproduct levels that federal data does not carry.
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