Federal officials are moving towards new regulations for managing the Colorado River, yet the seven states sharing its waters remain in disagreement over allocation. Interior Secretary Doug Burgum held a virtual meeting with the governors of these states, highlighting the lack of progress in negotiations.
The Colorado River provides water to approximately 40 million people in the American West, and the existing guidelines for its management are set to expire. The negotiations have split the states into two factions: the Lower Basin states—Arizona, California, and Nevada—are pushing for a plan that includes mandatory reductions in water usage to align demand with actual river supply.
Arizona is particularly vulnerable in this situation, facing a potential cut of up to 77 percent of its Colorado River allocation due to its junior priority rights compared to California. This precarious position stems from an agreement made decades ago, where Arizona accepted a lower priority in exchange for federal funding for the Central Arizona Project canal.
In addition to the broader negotiations, an internal dispute is arising within Arizona itself. Cities relying on the Central Arizona Project canal are seeking clarity on how the Arizona Water Banking Authority will allocate Colorado River water that has been stored underground over the years. This disagreement is significant for the rapidly growing suburbs that originally banked this water.
Earlier in 2026, a state judge ruled that the Arizona Department of Water Resources had unlawfully altered its methods for determining the availability of groundwater necessary for new home construction in certain areas. This ruling has direct implications for subdivision approvals and ties the river negotiations to housing development.
Water banking, while less familiar to many, plays a crucial role in this context. Arizona has historically stored excess Colorado River water underground as a safeguard against shortages. The current dispute centers on the terms for withdrawing this stored water and the order of priority for access.
