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EPA's UCMR 5 data lists water systems on tribal lands by EPA region (Region 8) rather than by state.
EPA UCMR 5 results for 13 public water systems. 1 had at least one PFAS detected; 1 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 |
|---|---|---|---|---|
| Belcourt-Turtle Mtn Rural Water System 083890023 | ND | ND | 0 | |
| Fort Washakie 085690003 | 9.3 | ND | 1 | |
| Kyle Water System 084690474 | ND | ND | 0 | |
| Mission Water System 084690532 | ND | ND | 0 | |
| Oglala RWS Pipeline 084690480 | ND | ND | 0 | |
| Pine Ridge Water System 084690475 | ND | ND | 0 | |
| Rosebud Rural Water System 084690528 | ND | ND | 0 | |
| Sicangu Mni Wiconi Rural Water System 084690516 | ND | ND | 0 | |
| Spirit Lake Water Management RWS 083890025 | ND | ND | 0 | |
| St. Francis 084690020 | ND | ND | 0 | |
| Standing Rock Rural Water System 084690510 | ND | ND | 0 | |
| Town of Browning 083090091 | ND | ND | 0 | |
| Uriah Heeps Spring Water System 084990002 | 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.