Home › PFAS › EPA Region 10 (tribal)
EPA's UCMR 5 data lists water systems on tribal lands by EPA region (Region 10) rather than by state.
EPA UCMR 5 results for 10 public water systems. 0 had at least one PFAS detected; 0 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 |
|---|---|---|---|---|
| Fort Hall 101612109 | Fort Hall | ND | ND | 0 |
| Lummi Tribal Water District 105300002 | Ferndale | ND | ND | 0 |
| Mt. Vista - Dungeness Golf Course 105388889 | Sequim | ND | ND | 0 |
| Pocatello Airport 101600009 | Pocatello | ND | ND | 0 |
| Quil Ceda Village 105300116 | Tulalip | ND | ND | 0 |
| Shoalwater Bay 105300019 | Tokeland | ND | ND | 0 |
| Spirit Mountain Casino 104121115 | Grand Ronde | ND | ND | 0 |
| Swinomish Casino & Lodge 105338108 | La Conner | ND | ND | 0 |
| Tulalip Bay Water Dist #1 105300003 | Marysville | ND | ND | 0 |
| Warm Springs Water Treatment Plant 104101247 | Warm Springs | 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.