Nevada Lawsuit Challenges Feds: Arizona Water Use Faces Cuts

• Nevada has filed a lawsuit against the federal government, challenging mandatory Colorado River water cuts that could reduce its entitlement by up to 71%.
• Arizona faces significant water reductions under the Bureau of Reclamation's new guidelines, totaling over 1.8 million acre-feet by the end of water year 2028.
• The Central Arizona Project, which supplies nearly 50% of Phoenix's water, could face complete cutoffs in the driest years.
• Officials from Arizona and the Gila River Indian Community express concerns about the legal flaws in the new guidelines and the increased uncertainty caused by the Nevada lawsuit.
• Future water cuts for lower basin states will be influenced by Lake Powell's elevation, with potential for further reductions if water levels remain low.

The legal challenge initiated by Nevada introduces a substantial layer of uncertainty into the future of Colorado River management.

Nevada has initiated legal action against the federal government, challenging mandatory reductions in Colorado River water allocations that could diminish the Silver State's total entitlement by as much as 71%. This development has cast a shadow of uncertainty over the recently finalized Colorado River use guidelines issued by the Bureau of Reclamation, particularly for Arizona, which faces substantial water cuts.

Arizona officials are grappling with a complex situation. While some experts view the Bureau's decision as the most favorable outcome among the options considered, others lament the reality of losing nearly a third of the state's share of the vital river. Despite earlier threats of legal action over its water rights, Arizona Department of Water Resources Director Tom Buschatzke characterized the Bureau's decision as a victory. However, he acknowledged that the ongoing Nevada lawsuit significantly complicates the path forward.

Under the Bureau's new plan, the lower basin states—Arizona, Nevada, and California—are collectively mandated to reduce their water consumption by 3.5 million acre-feet over the next two years. Arizona is slated to bear the largest portion of these cuts, surrendering 760,000 acre-feet annually for two years. When combined with an additional 300,000 acre-feet from voluntary conservation efforts, Arizona's total water loss is projected to exceed 1.8 million acre-feet by the conclusion of water year 2028.

The Bureau of Reclamation's plan emerges from years of protracted negotiations aimed at establishing post-2026 operating guidelines for the Colorado River. These discussions repeatedly missed deadlines and ultimately reached an impasse, largely because the upper basin states—Colorado, Utah, Wyoming, and New Mexico—declined to accept mandatory cuts, asserting their senior priority under the established "Law of the River."

Central Arizona Project (CAP) General Manager Brenda Burman, while refraining from taking a definitive stance on the Nevada lawsuit, publicly stated that the post-2026 operating guidelines decision contains "fundamental legal flaws." She specifically cited a failure to adhere to the Colorado River Compact and other crucial elements of the "Law of the River," including the controversial decision not to impose water reductions on the upper basin states. This perspective underscores the deep-seated disagreements that persist despite the Bureau's finalized plan.

The Gila River Indian Community has also voiced its support for Nevada's legal challenge. Governor Stephen Roe Lewis indicated that the community's concerns were not adequately addressed by the U.S. government, leading to the current litigious environment. This alignment highlights a broader dissatisfaction with how the federal government has managed the allocation of the river's diminishing resources, further intensifying the legal and political landscape surrounding Arizona water use Nevada lawsuit.

The legal challenge initiated by Nevada introduces a substantial layer of uncertainty into the future of Colorado River management. Arizona Department of Water Resources Director Tom Buschatzke expressed concern, noting that the "uncertainty is going in the wrong direction and it seems to continue to go in that direction." He also indicated that if the lawsuit prevents the current agreement from proceeding, the nature of any mandatory federal water cuts during the litigation remains unknown. Buschatzke reiterated that Arizona has not consented to any further water reductions beyond the initial two-year period outlined in the operating guidelines.

The Bureau's plan includes a provision for reconsultation every two years, a mechanism that could potentially more than double the water cuts Arizona faces in subsequent periods. This ongoing cycle of negotiation is anticipated by Brenda Burman, who stated that stakeholders "expect to be in a constant cycle of negotiation moving forward." The consequences for Arizona's critical water infrastructure are stark: in the driest years, the Central Arizona Project, a 330-mile canal supplying nearly half of Phoenix's water, could face a complete cessation of deliveries from the river. Already in 2022, the CAP halted deliveries to most non-tribal agricultural fields.

Future reductions for the lower basin states will be partially determined by the water levels in Lake Powell, the second-largest reservoir for Colorado River water. The Bureau will conduct 24-month studies to ascertain the highest possible release volume necessary to maintain Lake Powell at 3,510 feet, a level just 140 feet above "deadpool." Should this release volume fall at or below 6 million acre-feet, it will trigger additional reconsultations aimed at further reducing lower basin allocations, underscoring the precarious future of Arizona water use.

Source: Original reporting via Courthouse News Service