The U.S. government finalized a new 10-year decision framework to address the drying Colorado River, leading to mandatory water supply reductions for Arizona, California, and Nevada starting in 2027, officials confirmed Friday according to the Washington Post. Signed by Interior Secretary Doug Burgum, the plan reduces water allocations for the three so-called Lower Basin states by a combined 1.25 million acre-feet annually for 2027 and 2028, matching a proposal previously put forward by the states themselves, as reported by Reuters.
Federal Government Finalizes Mandatory Water Cuts for Southwestern States
The reductions represent the largest cuts ever proposed for the three states, responding to an ongoing multidecadal drought and record-low snowpack during the winter of 2025-2026 that pushed major basin reservoirs to historic lows, according to details published by UPI. The Colorado River basin serves as a crucial water and power source for more than 40 million people across the Western United States, irrigates land producing 15% of the nation’s food output, and supports numerous tribal nations and Mexico.
Allocation Reductions and State-by-State Impact
Under the initial two-year operating guidelines for 2027 and 2028, the three Lower Basin states will trim 1.25 million acre-feet out of the usual allocation of 7.5 million acre-feet that they share, according to reporting from the Columbus Dispatch. An acre-foot is generally defined as enough water to supply roughly three to four households for a full year.
The distribution of the mandatory water delivery cuts breaks down across the three states as follows:
- Arizona: Absorbs the largest reduction at 760,000 acre-feet per year, attributed to the lower legal priority of its Central Arizona Project supply.
- California: Faces yearly reductions amounting to 440,000 acre-feet.
- Nevada: Sustains a reduction of 50,000 acre-feet annually, reflecting its smaller baseline allocation from the river.
In addition to the mandatory cuts, the states agreed to voluntarily conserve and store an additional 700,000 acre-feet of water over the same two-year period, bringing total combined water savings to 3.2 million acre-feet. Meanwhile, the Upper Basin states of Colorado, Utah, New Mexico, and Wyoming face no mandatory cuts under the immediate plan.
Future Uncertainty and Potential Legal Battles
While the initial two-year plan spares the Lower Basin states from immediate, steeper reductions, the broader 10-year framework allows for annual mandatory cuts to potentially double up to 3.0 million acre-feet per year in subsequent years if necessary to maintain critical reservoir levels at Lake Mead and Lake Powell, according to es-us.noticias.yahoo.com coverage via Yahoo.
The prospect of deeper future cuts has drawn sharp pushback from state leaders. Arizona and Nevada officials warned that escalating the cuts to 3 million acre-feet could devastate local economies, with Arizona setting aside funds for a potential lawsuit against the federal government if those steeper cuts are enforced. Arizona Governor Katie Hobbs praised the acceptance of the initial two-year compromise but signaled readiness to protect the state’s water rights moving forward. California, Arizona, and Nevada have shown that states can compromise, make difficult decisions, and reduce water use when the river demands it. But three states cannot carry the responsibility of all seven,
said JB Hamby, Colorado River Commissioner for California.
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