Arizona, Nevada Sue Federal Government Over Colorado River Water Cuts

Arizona and Nevada have filed lawsuits challenging the U.S. Department of the Interior's plan for Colorado River water management, which mandates a collective 1.25 million acre-feet reduction for the Lower Basin states starting in 2027[1][3][8]. This federal plan assigns Arizona the largest cut, approximately 760,000 acre-feet annually, representing about 28% of its current allocation[14].

The legal challenges highlight deep divisions among states over managing the drought-stressed Colorado River, which supplies water to 40 million people across seven states[4]. These federal cuts could severely impact Arizona's agricultural sector and water supply, prompting concerns over economic stability and human safety[14].

What the records show

The Record of Decision for the Decision Framework for Colorado River Guidelines (2027–2036), issued on August 21, 2026, details the federal plan[8][9]. Under this framework, the Lower Basin states, Arizona, California, and Nevada, face mandatory reductions totaling 1.25 million acre-feet annually for 2027 and 2028[3][8]. These states have also committed to voluntarily conserving an additional 700,000 acre-feet through 2028[8].

Arizona's reduction is 760,000 acre-feet per year, California's is 440,000 acre-feet per year, and Nevada's is 50,000 acre-feet per year[14]. This disproportionate share for Arizona stems from historical agreements that grant California's water rights seniority over Central Arizona Project supplies during shortages[14]. By late July 2026, the combined storage of Lake Powell and Lake Mead was 12.5 million acre-feet, representing 23.4% of their combined capacity[11]. Lake Mead recorded a new record low of 1,037.16 feet on October 22, 2026[5][6].

The timeline

Snowpack in Utah and Colorado was below the 2001-2025 averages and peaked approximately four weeks earlier than usual in March 2026, contributing to the Colorado River's water crisis[13]. By late July 2026, the combined storage of Lake Powell and Lake Mead stood at 12.5 million acre-feet, 23.4% of capacity[11]. The U.S. Department of the Interior released its plan for managing the drought-stressed system on July 31, 2026[1]. Nevada filed a lawsuit in August 2026[14]. The Record of Decision for the Decision Framework for Colorado River Guidelines (2027–2036) was issued on August 21, 2026[8][9]. On October 16, 2026, Arizona joined Nevada's lawsuit[14]. Lake Mead recorded a new record low of 1,037.16 feet on October 22, 2026[5][6].

What the subject has said publicly

Arizona Department of Water Resources Director Tom Buschatzke stated on October 16, 2026, that "The United States' decision puts the entire burden of sacrifice on the shoulder of three states"[14]. He added that such reductions "could effectively dry up the Central Arizona Project"[14]. Buschatzke also referenced Arizona's past contributions, stating, "With more than 5.5 million acre-feet of Arizona water left in Lake Mead since 2014, no state has sacrificed more"[14].

Arizona Governor Katie Hobbs asserted on October 16, 2026, that "Arizona has always been willing to do our part to protect the Colorado River, but we will not accept a forced federal plan that solves this crisis on the backs of our families, farmers, and businesses"[14]. She also stated, "We are drawing a line in the sand. I am taking this legal action alongside Nevada because the federal government refuses to hold the upper basin accountable for the water deliveries they owe Arizona, and is threatening to force draconian cuts that go well beyond the Lower Basin Agreement"[14]. Nevada's lawsuit from August 2026 claimed the cuts would cause "devastating environmental, socioeconomic, and health and human safety impacts"[14].

What we could not confirm

• The specific details or demands of Nevada's lawsuit.
• The official response from the U.S. Department of the Interior to the lawsuits.
• Any public statements from California regarding the federal plan or potential legal action.
• The exact nature of the "draconian cuts" Governor Hobbs mentioned[14].
• The detailed impact of these cuts on Upper Basin states' water deliveries to Lower Basin states.