Public Water Systems (PWS)
Public Water Systems and Their Categories

  • 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).
Breakdown of PWS's within the Navajo Jurisdiction
Number of Water Systems by Owners
No of Systems
Navajo Tribal Utility Authority
Schools, BIA
Companies, Businesses (Burnham Junction, Peabody Western Coal Company, Transwestern Pipeline Company)
Schools, Public (Ganado Public School, Tohatchi Public School, Monument Valley (UT) High School, etc.)
Schools, Grant
Tribal, Government (Navajo Parks & Recreation)
Tribal, chapters
Tribal Utility (Ramah Navajo Utility Authority)
Institutions, Health (Ganado Sage Memorial, Monument Valley Mission Hospital)
Federal Government (National Park Service)
Schools, Private (St. Michaels Indian School)
Grand Total of Public Water System
Sanitary Survey Inspections

PWSSP conducts 75-80 on-site sanitary survey inspections per year depending on condition of the
water PWSSP conducts inspections of all public water systems under the jurisdiction of the Navajo
Nation. These inspections are conducted to evaluate the adequacy of the source, facilities,
equipment, operation and maintenance for producing and distributing safe drinking water.
Follow-up Inspections

Follow-up inspections are conducted
from 6 months to a year depending on
the condition of the PWS and
their compliance status. Groundwater
inspections are conducted on a 2-5 year
basis depending on the condition of the
PWS. Surface water and Groundwater
Under the Direct Influence (GWUDI) of
Surface Water
inspections are conducted on an annual

Enforcement Inspections

Enforcement inspections are conducted
by U.S. EPA, Region IX or they contract
consultants to conduct these special
inspections on systems that Navajo
PWSSP has no jurisdiction to regulate
the water system.
Abandoned Water Sources

Many abandoned wells are frequently
encountered during scheduled water
inspections. The PWSSP is currently working
with the Department of Water Resources to
ensure the proper abandonment of these types
of  wells.  In the interim, PWSSP recommends
that these wells be welded with a metal cap.

These types of wells posed a threat to the overall
quality of an aquifer. These wells are not typically
covered or protected from any potential threat of