What is PFAS?
Water suppliers
PFAS value per supplier, 2023–2025. EPA limit — 4 ppt (0.004 µg/L) for PFOA and PFOS, set in 2024. Suppliers that detected PFOA or PFOS
are highlighted and listed first. “Not detected” means the contaminant was measured but
not found.
| Supplier | City | Population | PFAS (ug/L) |
|---|---|---|---|
| Rapid Valley Sanitary District | Rapid City | 11,408 | 0.0057 µg/L |
| Sioux Falls | Sioux Falls | 216,462 | Not detected |
| Rapid City | Rapid City | 72,009 | Not detected |
| Aberdeen | Aberdeen | 27,989 | Not detected |
| Brookings Municipal Utilities | Brookings | 23,377 | Not detected |
| Watertown Municipal Utilities | Watertown | 23,230 | Not detected |
| Web Water Development Association | Aberdeen | 20,750 | Not detected |
| Mitchell | Mitchell | 15,651 | Not detected |
| Yankton | Yankton | 15,411 | Not detected |
| Huron | Huron | 14,263 | Not detected |
| Pierre | Pierre | 14,091 | Not detected |
| Box Elder | Box Elder | 14,000 | Not detected |
| Spearfish | Spearfish | 13,803 | Not detected |
| Minnehaha Community Water Corp | Dell Rapids | 13,435 | Not detected |
| By Water District | Avon | 13,320 | Not detected |
| Mid-Dakota Rural Water | Miller | 11,833 | Not detected |
| Vermillion | Vermillion | 11,695 | Not detected |
| Brandon | Brandon | 11,048 | Not detected |
| Harrisburg | Harrisburg | 10,297 | Not detected |
| Ellsworth Afb | Ellsworth Afb | 9,100 | Not detected |
| Pine Ridge Water System | Pine Ridge | 7,482 | Not detected |
| Tea | Tea | 7,381 | Not detected |
| Sturgis | Sturgis | 7,020 | Not detected |
| Kyle Water System | Pine Ridge | 6,526 | Not detected |
| Kingbrook I Rural Water System | Arlington | 6,455 | Not detected |
| Randall Community Water District | Lake Andes | 6,248 | Not detected |
| Brookings-Deuel Rural Water System | Clear Lake | 6,200 | Not detected |
| Madison | Madison | 6,191 | Not detected |
| Lincoln County Rural Water System | Sioux Falls | 5,965 | Not detected |
| Big Sioux Community Water System | Egan | 5,800 | Not detected |
| Brown-Day-Marshall Rws | Britton | 5,673 | Not detected |
| Belle Fourche | Belle Fourche | 5,617 | Not detected |
| Sicangu Mni Wiconi Rural Water System | Rosebud | 5,610 | Not detected |
| Rosebud Rural Water System | Rosebud | 5,500 | Not detected |
| South Lincoln Rural Water System | Beresford | 5,250 | Not detected |
| Grant-Roberts Rural Water System | Milbank | 5,050 | Not detected |
| Tripp County Water User District | Hamill | 4,860 | Not detected |
| Clay Rural Water System | Wakonda | 4,780 | Not detected |
| Wr/Lj - Mni Wiconi | Murdo | 4,720 | Not detected |
| Black Hawk Water User District | Black Hawk | 4,500 | Not detected |
| Sioux Rural Water System | Goodwin | 4,280 | Not detected |
| Tm Rural Water District | Parker | 4,250 | Not detected |
| Eagle Butte | Eagle Butte | 4,000 | Not detected |
| Dell Rapids | Dell Rapids | 3,633 | Not detected |
| Oglala Rws Pipeline | Pine Ridge | 3,562 | Not detected |
| Hot Springs | Hot Springs | 3,395 | Not detected |
| Mobridge | Mobridge | 3,261 | Not detected |
| St. Francis | Rosebud | 2,450 | Not detected |
| Tri-County Rural Water System | Eagle Butte | 2,190 | Not detected |
| Mission Water System | Mission | 1,500 | Not detected |
| Philip | Philip | 759 | Not detected |
| Wall | Wall | 699 | Not detected |
| Sun Valley Development | Rapid City | 650 | Not detected |
| Tmt, Inc. | Pierre | 250 | Not detected |
| Rendezvous Ranch | Black Hawk | 195 | Not detected |