EPA's UCMR 5 data lists these water systems under the Navajo Nation rather than a state.
EPA UCMR 5 results for 13 public water systems. 2 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 |
|---|---|---|---|---|
| Chinle-Many Farms-Del Muerto Ntua NN0400174 | Chinle, Many Farms, Del Muerto | ND | ND | 0 |
| Crownpoint-Littlewater-Three Mile Point Ntua NN3503039 | Crownpoint, Littlewater, Three Mile Poin | ND | ND | 0 |
| Dilkon-Indian Wells-Greasewood-White Cone Ntua NN0400342 | Dilcon, Indian Wells, Lower Greasewood, | ND | ND | 0 |
| Farmington Rural-Shiprock-Beclabito Ntua NN3500245 | Upper Fruitland, Nenahnezad, San Juan, N | ND | ND | 0 |
| Fort Defiance-Window Rock-St Michaels Ntua NN0403000 | Fort Defiance, Window Rock, St. Michaels | ND | ND | 0 |
| Ganado Public Schools NN0400289 | Ganado | ND | ND | 0 |
| Ganado-Burnside-Cornfield-Steamboat Ntua NN0403001 | Ganado, Cornfield, Steamboat, Woodspring | ND | ND | 3 |
| Greasewood Springs Community Boarding School Bia NN0436008 | Lower Greasewood | ND | ND | 0 |
| Kayenta Ntua NN0403003 | Kayenta | ND | ND | 1 |
| Mariano Lake-Pinedale-Church Rock Ntua NN3500211 | Mariano Lake, Pinedale, Churchrock | ND | ND | 0 |
| Pinon-District 4 Ntua NN0403004 | Pinon, South Pinon, Burnt Corn, Blue Gap | ND | ND | 0 |
| Toadlena Ntua NN3503028 | Toadlena, Two Grey Hills | ND | ND | 0 |
| Tuba City Ntua NN0400206 | Tuba City | 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.