PFAS in Tribal Systems, EPA Region 8 drinking water
EPA's final UCMR 5 data covers 13 public water systems in Tribal Systems, EPA Region 8, serving about 68,410 people. PFAS turned up in 1 of them (8%). 0 averaged above at least one EPA limit at a sampling point.
Every tested system in Tribal Systems, EPA Region 8
Largest first. PFOA and PFOS columns show the average at each system's worst sampling point; EPA's limit for each is 4 ppt. Filter by name:
| Water system | People | PFOA | PFOS | PFAS found | Result |
|---|---|---|---|---|---|
| Belcourt-turtle Mtn Rural Water System · Belcourt | 13,500 | - | - | 0 | None found |
| Pine Ridge Water System · Pine Ridge | 7,482 | - | - | 0 | None found |
| Standing Rock Rural Water System · Fort Yates | 6,839 | - | - | 0 | None found |
| Kyle Water System · Pine Ridge | 6,526 | - | - | 0 | None found |
| Sicangu Mni Wiconi Rural Water System · Rosebud | 5,610 | - | - | 0 | None found |
| Rosebud Rural Water System · Rosebud | 5,500 | - | - | 0 | None found |
| Town of Browning · Browning | 4,671 | - | - | 0 | None found |
| Spirit Lake Water Management Rws · St. Michael | 4,400 | - | - | 0 | None found |
| Uriah Heeps Spring Water System · Ft. Duchesne | 3,750 | - | - | 0 | None found |
| Oglala Rws Pipeline · Pine Ridge | 3,562 | - | - | 0 | None found |
| Fort Washakie · Fort Washakie | 2,620 | 2.3 | - | 1 | Sample at limit |
| St. Francis · Rosebud | 2,450 | - | - | 0 | None found |
| Mission Water System · Mission | 1,500 | - | - | 0 | None found |
Cite this page
Well & Tap. "PFAS in Tribal Systems, EPA Region 8 drinking water: results for 13 systems." Data: U.S. EPA UCMR 5, final release August 2026. https://wellandtap.com/pfas/tribal-systems-epa-region-8/
Source: EPA UCMR 5 final occurrence data (August 2026); population from EPA SDWIS. Method.