The Northeastern Arizona Indian Water Rights Settlement Act of 2025 aims to achieve a comprehensive and final resolution of water rights claims for the Navajo Nation, the Hopi Tribe, and the San Juan Southern Paiute Tribe in Arizona. It formally ratifies a complex settlement agreement, outlining the allocation of specific Colorado River water entitlements to these tribes and their allottees. The Act also directs the Secretary of the Interior to execute the agreement and fulfill associated obligations. A central provision of the bill is the establishment of significant financial resources for the tribes. It mandates the appropriation of over $3.4 billion into dedicated tribal water settlement trust funds for the Navajo Nation, Hopi Tribe, and San Juan Southern Paiute Tribe. These funds are earmarked for critical infrastructure projects, including water delivery systems, operation and maintenance costs, agricultural conservation, and renewable energy initiatives. Furthermore, the Act authorizes over $1.7 billion for the planning, design, and construction of the "iina ba - paa tuwaqat'si pipeline." This major water project is designed to deliver potable Colorado River Water to communities within the Navajo Nation, Hopi Tribe, and the San Juan Southern Paiute Southern Area, addressing long-standing water supply needs. The pipeline's construction is subject to environmental compliance and a cost-sharing agreement, with eventual transfer of ownership to the tribes. In exchange for these substantial benefits, the bill requires extensive waivers and releases of past, present, and future water rights claims by the participating tribes and the United States, acting as their trustee. These waivers cover claims against the State of Arizona, other entities, and the federal government, ensuring legal certainty regarding water allocations. However, certain claims, such as the enforcement of the settlement's terms, are explicitly retained. The settlement's enforceability is contingent upon several key conditions, including the revision and execution of the settlement agreement by all required parties, the authorization and appropriation of the full $5.136 billion in federal funding, and the approval of related adjudication decrees. If these conditions are not met by a specified deadline, the Act will be repealed, and unspent funds will revert to the Treasury, with the exception of the creation of the San Juan Southern Paiute Reservation. The Act also includes provisions for Colorado River water accounting, limited waivers of tribal sovereign immunity for enforcement actions, and the formal creation of the San Juan Southern Paiute Reservation.