based on U.S. EPA-Region 9's approval of the Primary Enforcement Authority over most of the water systems on the Navajo Nation.
- Community Water Systems (CWS) a public water system which serves at least 15 service connections used by year-round residents or regularly
serves at least 25 year-round residents. - Non-Transient, Non-Community Water Systems (NTNCWS) a public water systems that is not a “community water system” and that regularly
serves at least 25 of the same persons for more than 6 months per year, including but not limited to schools, factories and public buildings. - Transient, Non-Community Water Systems (TNCWS) a public water systems that is neither a “community water system” nor a “non-transient non-
community water system,” including but not limited to seasonal facilities such as children’s camps or recreational camping areas; and year-round
facilities that serve more than 25 persons who are not residents thereof, such as gasoline service stations, marinas, rest areas and restaurants
that are not served by a community water system. These systems are required to sample bacteriological quality on a quarterly basis and for
nitrate/nitrite annually. - Consecutive Public Water Systems a public water systems that purchase water from a primary purveyor. This type of water system typically
purchases water, pumps the water into their own storage tanks and distributes the water through their own pipes (i.e., schools, stores, etc.) These
systems are required to monitor for bacteriological quality on a monthly basis, lead/copper, and asbestos (if asbestos-cement (AC) pipe is used in
the distribution).
| Number of Water Systems by Owners |
# of Systems |
| Navajo Tribal Utility Authority |
94 |
| Tribal, governments (Navajo Nation Water Resources, Navajo Parks & Recreation, etc.) |
9 |
| Tribal, chapters |
4 |
| Tribal, utilities (Ramah Navajo Utility Authority) |
4 |
| Businesses (Black Mesa Shopping Center, Tsegi Anasazi Inn, Burnham Junction Mustang) |
8 |
| Companies (Peabody Western Coal Company, El Paso Natural Gas, Enron) |
5 |
| Federal, governments (National Park Service) |
2 |
| Institutions, health (Ganado Sage Memorial Hospital, MV Mission Hospital, etc.) |
2 |
| Missions & Churches (Navajo Gospel Mission, White Post Mission) |
2 |
| Schools, BIA |
33 |
| Schools, Grant |
7 |
| Schools, Private (St. Michaels Indian School and Immanuel Mission) |
2 |
| Schools, Public |
9 |
| Grand Total of PWS’s |
182 |
