EPA UCMR 5 results for 49 public water systems. 7 had at least one PFAS detected; 2 had a highest single PFOA or PFOS result above 4.0 ppt.
UCMR 5 is a one-time EPA monitoring program, not a compliance determination. The values shown are the highest single sample result at any of the system's sampling points; one result above 4.0 ppt does not mean the system violates the PFAS rule, which is judged on running annual averages under separate compliance monitoring. Results describe the public water system, not an individual home.
| Water system | Serves | PFOA max (ppt) | PFOS max (ppt) | PFAS detected |
|---|---|---|---|---|
| Aberdeen SD4600020 | Aberdeen | ND | ND | 1 |
| Belle Fourche SD4600037 | Belle Fourche | ND | ND | 0 |
| Big Sioux Community Water System SD4600429 | Egan | ND | ND | 0 |
| Black Hawk Water User District SD4600043 | Black Hawk | ND | ND | 0 |
| Bon Homme-Yankton RWS SD4600865 | Avon, Tabor | ND | ND | 0 |
| Box Elder SD4600046 | Box Elder | ND | ND | 0 |
| Brandon SD4600048 | Brandon | ND | ND | 0 |
| Brookings Municipal Utilities SD4600071 | Brookings | ND | ND | 0 |
| Brookings-Deuel Rural Water System SD4600430 | Clear Lake, Toronto | ND | ND | 0 |
| Brown-Day-Marshall RWS SD4600882 | Britton | ND | ND | 0 |
| Clay Rural Water System SD4600626 | Wakonda | ND | ND | 0 |
| Dell Rapids SD4600105 | Dell Rapids | ND | ND | 0 |
| Eagle Butte SD4600010 | Eagle Butte | ND | ND | 0 |
| Ellsworth AFB SD4680004 | Ellsworth Afb | ND | ND | 0 |
| Grant-Roberts Rural Water System SD4600864 | Milbank | ND | ND | 0 |
| Harrisburg, SD SD4600148 | Harrisburg | ND | ND | 1 |
| Hot Springs SD4600163 | Hot Springs | ND | ND | 0 |
| Huron SD4600169 | Huron | ND | ND | 0 |
| Kingbrook I Rural Water System SD4600431 | Arlington | ND | ND | 0 |
| Lincoln County Rural Water System SD4600304 | Sioux Falls | ND | ND | 1 |
| Madison SD4600199 | Madison | ND | ND | 0 |
| Mid-Dakota Rural Water SD4602175 | Miller, Pierre | ND | ND | 0 |
| Minnehaha Community Water Corp SD4600432 | Dell Rapids | ND | ND | 0 |
| Mitchell SD4600214 | Mitchell | ND | ND | 0 |
| Mobridge SD4600215 | Mobridge | ND | ND | 0 |
| NPS-Mount Rushmore National Memorial SD4680046 | Keystone | ND | 10.6 | 3 |
| Philip SD4600238 | Philip | ND | ND | 0 |
| Pierre SD4600242 | Pierre | ND | ND | 0 |
| Randall Community Water District SD4600433 | Lake Andes | ND | ND | 0 |
| Rapid City SD4600406 | Rapid City | ND | ND | 1 |
| Rapid Valley Sanitary District SD4600274 | Rapid City | ND | 5.7 | 2 |
| Rendezvous Ranch SD4602210 | Black Hawk | ND | ND | 0 |
| Sioux Falls SD4600294 | Sioux Falls | ND | ND | 0 |
| Sioux Rural Water System SD4600866 | Goodwin, Watertown | ND | ND | 0 |
| South Lincoln Rural Water System SD4600870 | Beresford, Worthing | ND | ND | 0 |
| Spearfish SD4600311 | Spearfish | ND | ND | 0 |
| Sturgis SD4600321 | Sturgis | ND | ND | 0 |
| Sun Valley Development SD4602270 | Rapid City | ND | ND | 0 |
| TM Rural Water District SD4600999 | Parker, Sioux Falls | ND | ND | 0 |
| TMT, Inc. SD4602154 | Pierre | ND | ND | 0 |
| Tea SD4600409 | Tea | ND | ND | 0 |
| Tri-County Rural Water System SD4600112 | Eagle Butte, Ridgeview | ND | ND | 0 |
| Tripp County Water User District SD4600520 | Hamill, Winner | ND | ND | 0 |
| Vermillion SD4600342 | Vermillion | ND | ND | 0 |
| WR/LJ - Mni Wiconi SD4602223 | Murdo | ND | ND | 1 |
| Wall SD4600417 | Wall | ND | ND | 0 |
| Watertown Municipal Utilities SD4600356 | Watertown | ND | ND | 0 |
| Web Water Development Association SD4601089 | Aberdeen | ND | ND | 0 |
| Yankton SD4600423 | Yankton | ND | ND | 0 |
ND = not detected (below the 4 ppt UCMR 5 reporting level). Values are the highest single sample result, not an annual average.