Navajo-Gallup Water Supply Project Amendments Act of 2023

This bill amends the Navajo-Gallup Water Supply Project to expand the service area to include additional communities in New Mexico and Arizona, allowing the Navajo Nation to deliver water to more tribal members. It establishes a Deferred Construction Fund to allow for deferring construction of certain project facilities to save on operations and maintenance costs. The bill increases the total authorized funding from $870 million to $2.175 billion, extends the funding period to 2029, and clarifies tax treatment for project facilities. These changes directly affect the Navajo Nation, Jicarilla Apache Nation, and the City of Gallup, New Mexico.