Drinking water / SD
PFAS in South Dakota drinking water
49 South Dakota public water systems tested under UCMR5. 7 detected at least one PFAS compound; 42 detected none at the reporting thresholds. Values are the highest single result per compound, in ng/L (parts per trillion). The federal limit for PFOA and PFOS is 4 ng/L.
| Water system | Serves | Highest results (ng/L) | Reading |
|---|---|---|---|
| NPS-MOUNT RUSHMORE NATIONAL MEMORIAL SD4680046 | Pennington | PFHxS 20.8PFOS 10.6 *PFBS 3.2 | above final limit |
| RAPID VALLEY SANITARY DISTRICT SD4600274 | Pennington | PFHxS 5.8PFOS 5.7 * | above final limit |
| ABERDEEN SD4600020 | Brown | PFBA 8.1 | detected |
| HARRISBURG, SD SD4600148 | Lincoln | PFBA 5.5 | detected |
| LINCOLN COUNTY RURAL WATER SYSTEM SD4600304 | Lincoln +1 | PFBA 6.1 | detected |
| RAPID CITY SD4600406 | Pennington | PFHxS 5.6 | detected |
| WR/LJ - MNI WICONI SD4602223 | Jones +2 | PFBA 8.1 | detected |
* exceeds the final federal MCL for that compound. Detections of compounds whose limits EPA proposed to rescind in May 2026 are shown for information.
Systems with no PFAS detected
42 tested systems reported no PFAS above the laboratory reporting limits. Each has its own page with its sampling detail.
- BELLE FOURCHE
- BIG SIOUX COMMUNITY WATER SYSTEM
- BLACK HAWK WATER USER DISTRICT
- BON HOMME-YANKTON RWS
- BOX ELDER
- BRANDON
- BROOKINGS MUNICIPAL UTILITIES
- BROOKINGS-DEUEL RURAL WATER SYSTEM
- BROWN-DAY-MARSHALL RWS
- CLAY RURAL WATER SYSTEM
- DELL RAPIDS
- EAGLE BUTTE
- ELLSWORTH AFB
- GRANT-ROBERTS RURAL WATER SYSTEM
- HOT SPRINGS
- HURON
- KINGBROOK I RURAL WATER SYSTEM
- MADISON
- MID-DAKOTA RURAL WATER
- MINNEHAHA COMMUNITY WATER CORP
- MITCHELL
- MOBRIDGE
- PHILIP
- PIERRE
- RANDALL COMMUNITY WATER DISTRICT
- RENDEZVOUS RANCH
- SIOUX FALLS
- SIOUX RURAL WATER SYSTEM
- SOUTH LINCOLN RURAL WATER SYSTEM
- SPEARFISH
- STURGIS
- SUN VALLEY DEVELOPMENT
- TEA
- TM RURAL WATER DISTRICT
- TMT, INC.
- TRI-COUNTY RURAL WATER SYSTEM
- TRIPP COUNTY WATER USER DISTRICT
- VERMILLION
- WALL
- WATERTOWN MUNICIPAL UTILITIES
- WEB WATER DEVELOPMENT ASSOCIATION
- YANKTON
A detection at the system level does not tell you what reaches one specific tap: levels vary by entry point, treatment train and plumbing. A certified lab test of your own tap settles it. Testing and treatment options