Arizona's leaders are warning of potential legal challenges against the Trump administration's plan for managing worsening water shortages along the Colorado River, asserting that mandatory cutbacks would disproportionately harm the state. This opposition could lead to a Supreme Court battle, further complicating efforts by seven Western states to agree on water allocation from the critically low reservoirs.
In a strongly worded letter to the federal government, Arizona Department of Water Resources Director Tom Buschatzke argued that the administration's 10-year drought contingency plan violates the 1922 Colorado River Compact, which originally established water-sharing agreements among the states. "Arizona does not accept a framework that gives the federal government the discretion to select from a wide range of alternatives — including catastrophic cuts," Buschatzke stated.
The Trump administration's plan, released July 31, permits significant water reductions if deemed necessary, potentially requiring Arizona, Nevada, and California to collectively reduce their water intake by up to 3 million acre-feet annually, representing as much as 40% of their combined allotments. While officials noted that the administration initially accepted a smaller reduction offer for the next two years, Arizona has signaled it will not agree to the federal approach for longer periods or accept such substantial cuts.
Arizona explicitly reserves its rights to compel federal compliance with the 1922 agreement and the "Law of the River," and to pursue legal recourse. Experts anticipate that the dispute, which could impact water for approximately 35 million people and 5 million acres of farmland, will likely end up in court. Kathryn Sorensen, director of research at Arizona State University's Kyl Center for Water Policy, noted that Arizona has little to lose by contesting the plan, suggesting that a lawsuit is a necessary course of action given the state's precarious situation.
Compounding the issue, the Colorado River Compact has historically overpromised water resources, and a persistent drought exacerbated by climate change has severely depleted the river's flow and its major reservoirs, Lake Mead and Lake Powell, to record lows. Arizona officials highlighted that falling water levels in Lake Mead could soon trigger a legal "tripwire," enabling the state to demand upstream cuts and initiate legal action for compact violations. The centennial agreement mandates a minimum ten-year average release of 7.5 million acre-feet for the three downstream states, a threshold that could be breached this year.
Brian Richter, a water researcher specializing in the Colorado River, suggested that Arizona might prevail in a lawsuit due to the compact's explicit provisions. However, he also emphasized the need to revise the outdated compact to reflect current hydrological realities and potentially cap total water usage. The river's flow has averaged 32% less since 2020 compared to the 20th century, with scientists attributing roughly half of this decline to rising temperatures driven by climate change.
