Navajo-Gallup Water Supply Project Amendments Act of 2025

Allows the Navajo Nation (and where relevant the Jicarilla Apache Nation) and the Secretary to defer building selected Navajo‑Gallup Water Supply Project facilities and deposit the money for those postponed facilities into a new Deferred Construction Fund for later use, expands authority for renewable and hydroelectric development tied to the project, and creates separate trust funds for construction, operations, maintenance, and conservation for the two tribes. It also adjusts contract, land‑trust, appropriation, investment, withdrawal, and taxation rules tied to project activities.

Adds a controlled path for the Navajo Nation to deliver limited non‑Project water to Navajo communities in Utah using Project infrastructure (subject to Utah approvals and an implementation agreement), sets deadlines and conditions for federal deposits and appropriations into the new funds, requires investment and reporting rules, and limits federal/state liabilities and responsibilities for non‑Project infrastructure.