Results from entry points (water leaving treatment, not household taps) of public water systems sampled under EPA's Fifth Unregulated Contaminant Monitoring Rule. Click a county to see every water system serving it, or turn on service areas and click a location to see the systems that serve that spot.
56 of the 524 public water systems listed for South Dakota were sampled. Sorted by the highest single result relative to EPA's 2024 limits. Each name links to a page with all of that system's results. All 524 South Dakota systems, including those not tested · Download all South Dakota results (CSV, gzip)
| System | PWSID | City | Population | PFOA (ppt) | PFOS (ppt) | HI | Highest single result |
|---|---|---|---|---|---|---|---|
| Nps-Mount Rushmore National Memorial | SD4680046 | Keystone | 4,100 | <MRL | 10.6 | 2.082 | PFOS 1–3 × its limit |
| Rapid Valley Sanitary District | SD4600274 | Rapid City | 11,408 | <MRL | 5.7 | 0.58 | PFOS 1–3 × its limit |
| Rapid City | SD4600406 | Rapid City | 72,009 | <MRL | <MRL | 0.56 | Hazard Index below its limit |
| Aberdeen | SD4600020 | Aberdeen | 27,989 | <MRL | <MRL | 0 | Other PFAS detected |
| Harrisburg | SD4600148 | Harrisburg | 10,297 | <MRL | <MRL | 0 | Other PFAS detected |
| Lincoln County Rural Water System | SD4600304 | Sioux Falls | 5,965 | <MRL | <MRL | 0 | Other PFAS detected |
| Wr/Lj - Mni Wiconi | SD4602223 | Murdo | 5,185 | <MRL | <MRL | 0 | Other PFAS detected |
| Belle Fourche | SD4600037 | Belle Fourche | 5,617 | <MRL | <MRL | 0 | No PFAS detected |
| Big Sioux Community Water System | SD4600429 | Egan | 5,800 | <MRL | <MRL | 0 | No PFAS detected |
| Black Hawk Water User District | SD4600043 | Black Hawk | 4,500 | <MRL | <MRL | 0 | No PFAS detected |
| Box Elder | SD4600046 | Box Elder | 14,000 | <MRL | <MRL | 0 | No PFAS detected |
| Brandon | SD4600048 | Brandon | 11,048 | <MRL | <MRL | 0 | No PFAS detected |
| Brookings Municipal Utilities | SD4600071 | Brookings | 23,377 | <MRL | <MRL | 0 | No PFAS detected |
| Brookings-Deuel Rural Water System | SD4600430 | Toronto | 6,200 | <MRL | <MRL | 0 | No PFAS detected |
| Brown-Day-Marshall Rws | SD4600882 | Britton | 5,673 | <MRL | <MRL | 0 | No PFAS detected |
| By Water District | SD4600865 | Tabor | 13,320 | <MRL | <MRL | 0 | No PFAS detected |
| Clay Rural Water System | SD4600626 | Wakonda | 4,780 | <MRL | <MRL | 0 | No PFAS detected |
| Dell Rapids | SD4600105 | Dell Rapids | 3,633 | <MRL | <MRL | 0 | No PFAS detected |
| Eagle Butte | SD4600010 | Eagle Butte | 4,000 | <MRL | <MRL | 0 | No PFAS detected |
| Ellsworth Afb | SD4680004 | Ellsworth Afb | 9,100 | <MRL | <MRL | 0 | No PFAS detected |
| Grant-Roberts Rural Water System | SD4600864 | Milbank | 5,050 | <MRL | <MRL | 0 | No PFAS detected |
| Hot Springs | SD4600163 | Hot Springs | 3,395 | <MRL | <MRL | 0 | No PFAS detected |
| Huron | SD4600169 | Huron | 14,263 | <MRL | <MRL | 0 | No PFAS detected |
| Kingbrook I Rural Water System | SD4600431 | Arlington | 6,455 | <MRL | <MRL | 0 | No PFAS detected |
| Kyle Water System | 084690474 | Pine Ridge | 6,526 | <MRL | <MRL | 0 | No PFAS detected |
| Madison | SD4600199 | Madison | 6,191 | <MRL | <MRL | 0 | No PFAS detected |
| Mid-Dakota Rural Water | SD4602175 | Miller | 11,833 | <MRL | <MRL | 0 | No PFAS detected |
| Minnehaha Community Water Corp | SD4600432 | Dell Rapids | 13,435 | <MRL | <MRL | 0 | No PFAS detected |
| Mission Water System | 084690532 | Mission | 2,500 | <MRL | <MRL | 0 | No PFAS detected |
| Mitchell | SD4600214 | Mitchell | 15,651 | <MRL | <MRL | 0 | No PFAS detected |
| Mobridge | SD4600215 | Mobridge | 3,261 | <MRL | <MRL | 0 | No PFAS detected |
| Oglala Rws Pipeline | 084690480 | Pine Ridge | 3,562 | <MRL | <MRL | 0 | No PFAS detected |
| Philip | SD4600238 | Philip | 759 | <MRL | <MRL | 0 | No PFAS detected |
| Pierre | SD4600242 | Pierre | 14,091 | <MRL | <MRL | 0 | No PFAS detected |
| Pine Ridge Water System | 084690475 | Pine Ridge | 7,482 | <MRL | <MRL | 0 | No PFAS detected |
| Randall Community Water District | SD4600433 | Lake Andes | 6,248 | <MRL | <MRL | 0 | No PFAS detected |
| Rendezvous Ranch | SD4602210 | Black Hawk | 195 | <MRL | <MRL | 0 | No PFAS detected |
| Rosebud Rural Water System | 084690528 | Rosebud | 5,500 | <MRL | <MRL | 0 | No PFAS detected |
| Sicangu Mni Wiconi Rural Water System | 084690516 | Rosebud | 5,610 | <MRL | <MRL | 0 | No PFAS detected |
| Sioux Falls | SD4600294 | Sioux Falls | 216,462 | <MRL | <MRL | 0 | No PFAS detected |
| Sioux Rural Water System | SD4600866 | Watertown | 4,280 | <MRL | <MRL | 0 | No PFAS detected |
| South Lincoln Rural Water System | SD4600870 | Beresford | 5,250 | <MRL | <MRL | 0 | No PFAS detected |
| Spearfish | SD4600311 | Spearfish | 13,803 | <MRL | <MRL | 0 | No PFAS detected |
| St. Francis | 084690020 | Rosebud | 2,450 | <MRL | <MRL | 0 | No PFAS detected |
| Sturgis | SD4600321 | Sturgis | 7,020 | <MRL | <MRL | 0 | No PFAS detected |
| Sun Valley Development | SD4602270 | Rapid City | 650 | <MRL | <MRL | 0 | No PFAS detected |
| Tea | SD4600409 | Tea | 7,381 | <MRL | <MRL | 0 | No PFAS detected |
| Tm Rural Water District | SD4600999 | Parker | 4,250 | <MRL | <MRL | 0 | No PFAS detected |
| Tmt, Inc. | SD4602154 | Pierre | 250 | <MRL | <MRL | 0 | No PFAS detected |
| Tri-County Rural Water System | SD4600112 | Eagle Butte | 2,190 | <MRL | <MRL | 0 | No PFAS detected |
| Tripp County Water User District | SD4600520 | Winner | 4,860 | <MRL | <MRL | 0 | No PFAS detected |
| Vermillion | SD4600342 | Vermillion | 11,695 | <MRL | <MRL | 0 | No PFAS detected |
| Wall | SD4600417 | Wall | 699 | <MRL | <MRL | 0 | No PFAS detected |
| Watertown Municipal Utilities | SD4600356 | Watertown | 23,230 | <MRL | <MRL | 0 | No PFAS detected |
| Web Water Development Association | SD4601089 | Aberdeen | 20,750 | <MRL | <MRL | 0 | No PFAS detected |
| Yankton | SD4600423 | Yankton | 15,411 | <MRL | <MRL | 0 | No PFAS detected |
Highest single result for each system; PFOA and PFOS in ppt (ng/L). Entry-point samples, not tap water; screening comparisons, not compliance determinations.