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EPA's UCMR 5 data lists water systems on tribal lands by EPA region (Region 9) rather than by state.
EPA UCMR 5 results for 41 public water systems. 8 had at least one PFAS detected; 3 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 |
|---|---|---|---|---|
| Ak Chin Village 090400090 | Ak-Chin Village | ND | ND | 1 |
| Barona 090600119 | Barona | ND | ND | 1 |
| Bia Truxton Agency 090400063 | Valentine, Az | ND | ND | 0 |
| Cache Creek Casino Resort 090605107 | ND | ND | 0 | |
| California Village 090600237 | ND | ND | 0 | |
| Casino Arizona 090400708 | Salt River Indian Community | ND | ND | 0 |
| Casino Arizona Talking Stick (Cats) 090400703 | ND | ND | 0 | |
| Chukchansi Gold Resort 090605163 | Chukchansi Gold Resort & Casino | 4.8 | ND | 4 |
| Cocopah Casino 090400673 | ND | ND | 0 | |
| Colorado River Regional Water System 090400051 | ND | ND | 0 | |
| Colusa Southern System 090605047 | ND | ND | 0 | |
| Dry Creek Rancheria 090600127 | ND | ND | 0 | |
| Fort Mcdowell Community 090400088 | ND | ND | 0 | |
| Graton Resort and Casino 090605174 | ND | ND | 0 | |
| Gric DPW Sacaton 090400047 | Sacaton, Sacaton Flats,Upper San Tan, Bl | ND | ND | 0 |
| Gric DPW Wild Horse Pass 090400692 | Wildhorse Pass Casino, St. Johns Komatke | ND | ND | 0 |
| Hard Rock Fire Mountain Water System 090605172 | ND | ND | 0 | |
| Hoopa Valley-Wide System 090605126 | Hoopa | ND | ND | 0 |
| Jackson Rancheria Casino & Hotel 090605109 | ND | ND | 0 | |
| Lone Butte Industrial 090400345 | Lone Butte Industrial | ND | ND | 0 |
| Morongo 090600142 | ND | ND | 0 | |
| Pala North 090605153 | 6.1 | ND | 4 | |
| Pauma 090605012 | ND | ND | 0 | |
| Pechanga 090605013 | ND | ND | 3 | |
| Polacca 090400106 | First Mesa Consolidated Villages | ND | ND | 0 |
| Quechan Utility 090400089 | ND | ND | 0 | |
| Red Hawk Casino - Shingle Springs 090600058 | Shingle Springs | ND | ND | 0 |
| Rincon Northern 090600147 | 5.6 | 8.9 | 5 | |
| Rolling Hills Casino 090600052 | ND | ND | 0 | |
| Salt River Public Works 090400109 | Salt River Indian Community | ND | ND | 0 |
| Santa Rosa Tachi Palace 090605136 | Santa Rosa Rancheria | ND | ND | 0 |
| Scua Upper Seven Mile 090400114 | ND | ND | 1 | |
| Sells Intertie 090400042 | Sells, Big Fields | ND | ND | 0 |
| Sycuan 090605024 | ND | ND | 0 | |
| Table Mountain Rancheria 090600154 | Table Mountain | ND | ND | 0 |
| Talking Stick Resort 090400707 | Salt River Indian Community | ND | ND | 0 |
| Thunder Valley Casino 090605161 | ND | ND | 0 | |
| Vaya Chin Intertie 090400020 | Vaya Chin, Hickiwan, San Simon Village/S | ND | ND | 0 |
| Viejas Community System 090600158 | Alpine | ND | ND | 1 |
| Wmatua Miner Flat 090400693 | ND | ND | 0 | |
| Yavapai Apache - Cliff Castle 090400117 | 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.