PFAS in Tribal Systems, EPA Region 10 drinking water
EPA's final UCMR 5 data covers 10 public water systems in Tribal Systems, EPA Region 10, serving about 58,355 people. PFAS turned up in 0 of them (0%). 0 averaged above at least one EPA limit at a sampling point.
Every tested system in Tribal Systems, EPA Region 10
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 |
|---|---|---|---|---|---|
| Quil Ceda Village · Tulalip | 30,000 | - | - | 0 | None found |
| Spirit Mountain Casino · Grand Ronde | 7,800 | - | - | 0 | None found |
| Tulalip Bay Water Dist #1 · Tulalip | 5,968 | - | - | 0 | None found |
| Warm Springs Water Treatment Plant · Warm Springs | 3,800 | - | - | 0 | None found |
| Lummi Tribal Water District · Bellingham | 3,699 | - | - | 0 | None found |
| Fort Hall · Fort Hall | 2,850 | - | - | 0 | None found |
| Swinomish Casino & Lodge · La Conner | 2,400 | - | - | 0 | None found |
| Shoalwater Bay · Tokeland | 898 | - | - | 0 | None found |
| Mt. Vista - Dungeness Golf Course · Sequim | 517 | - | - | 0 | None found |
| Pocatello Airport · Pocatello | 423 | - | - | 0 | None found |
Cite this page
Well & Tap. "PFAS in Tribal Systems, EPA Region 10 drinking water: results for 10 systems." Data: U.S. EPA UCMR 5, final release August 2026. https://wellandtap.com/pfas/tribal-systems-epa-region-10/
Source: EPA UCMR 5 final occurrence data (August 2026); population from EPA SDWIS. Method.