The department's director, Jason John, said it would take $10 million to address drought and mitigation. at more than 25,000 square miles in parts of Arizona, New Mexico and Utah, uses about 2 million gallons of water every day to feed livestock, but more is needed, the Navajo Nation Department of Water Resources said in a 2021 report. The Navajo Nation, which has the largest reservation in the U.S. The Ute Mountain Ute Tribe is among dozens of tribes across the Southwest contending with the region's two driest decades in at least 1,200 years.