Source Water Assessment and Protection Program
Source Water Assessment and Protection (SWAP)
On the Navajo Nation, the groundwater is the source of drinking water for 99 percent of the population that is served by a public water
system. Groundwater is used for raising livestock, agriculture, and industry. In the arid southwest, groundwater is a particular important
resource because of the scarcity of surface water. Although groundwater was once thought to be protected by layers of rocks and soil. It is
known that groundwater is vulnerable to many types of contamination. Groundwater Under the Direct Influence (GWUDI) of surface water
are by default vulnerable to all types of contamination. Contaminants can enter source waters from animal rangelands, illegal open
dumps, waste storage lagoons, sewage and septic systems. Source waters can also be contaminated by chemical spills, open well
casings, abandoned wells, fertilizers, herbicides, pesticides, animal waste, and other sources. Community drinking water systems are at
risk from many possible contamination sources and no community wants to face the loss of its drinking water.
As defined by the EPA, the Source Water Protection Area (SWPA) is the surface and subsurface area surrounding the well, wellfield,
springs, or surface water through which contaminants are likely to move through and reach the source waters. There are four major
components to the federally mandated SWAP program. The NNEPA-PWSSP is to ensure the following requirements have been met for
each regulated public drinking water system:
1.Delineate Source Water Protection Area(s) (SWPA) for each source (i.e., well, spring, surface water intake).
2. Inventory each SWPA for potential contaminant sources.
3. Conduct a susceptibility assessment for each drinking water source.
4. Make the findings of 1-3 readily available to interested parties.
The NNEPA-PWSSP is in good position to comply with these
requirements. The NNEPA-PWSSP has been assigned primacy for the
federal drinking water program on the Navajo Nation. The NNEPA-
PWSSP is responsible for implementing the SWAP requirements,
including information dissemination.
- CLICK HERE to view the Pollution Prevention - Susceptibility
Assessment Survey Form
- CLICK HERE to view the Susceptibility Assessment "Update"
Wellhead Protection Program
The NNEPA-PWSSP's primary limitation in implementing SWAP
requirements is the lack of disseminating the SWAP findings to
parties in a simple, user-friendly format. As a result, the
NNEPA-PWSSP is currently in the development stages with using
geographic information system (GIS) applications to manage, store,
and distribute this information by generating a computerized map. The
NNEPA-PWSSP is also planning to develop applications that will allow
interested parties to
access the SWAP information through a Internet Mapping application,
making it "secure, yet available."
The NNEPA-PWSSP is utilizing existing programs to implement the SWAP requirements. The Existing programs which may yield
successful implementation efforts include:
- Wellhead Protection Program
- Phase II/V Monitoring Waiver Program
- Emergency Water Supply Program
- Consumer Confidence Report Program
All public water systems' Source Water and Protection Plans will be described in report format within the following categories, each
category equates to a chapter within the SWPP report:
- Physical and climate aspects of the water system
- Physical description of the watershed
- Roles and duties of the agencies involved in Program Management
- Delineated Source Water Protection Area
- Inventory of potential contamination source
- Management approaches to any potential contamination threats
- Review contingency plans for natural and man-made disasters