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Environment & Climate

Federal government mandates Colorado River water cuts for lower basin states

Arizona, California, and Nevada face mandatory reductions of 1.25 million acre-feet annually starting in 2027 as reservoir levels hit historic lows.

Updated Aug 24, 2026 · 02:15 UTC3 reports

The short version

  • The Department of the Interior and Bureau of Reclamation ordered annual water supply reductions of 1.25 million acre-feet for Arizona, California, and Nevada for 2027 and 2028.
  • Arizona will absorb the largest portion of the cuts at 760,000 acre-feet, while upper basin states face no mandatory reductions for now.
  • The stopgap plan is designed to protect infrastructure at Lake Mead and Lake Powell, where water levels have dropped to near-record lows amid a prolonged 26-year drought.
  • Federal officials and state negotiators are using the two-year window to pursue a long-term consensus agreement before existing river rules expire.

Key facts

  • The U.S. Department of the Interior announced a mandatory reduction of 1.25 million acre-feet of Colorado River water annually for 2027 and 2028 affecting California, Arizona, and Nevada.[The Guardian · Associated Press · ABC News]
  • Under the negotiated distribution, Arizona faces 760,000 acre-feet in cuts, California faces 440,000 acre-feet, and Nevada will reduce use by 50,000 acre-feet.[ABC News]
  • Upper basin states—Colorado, Utah, Wyoming, and New Mexico—are exempt from mandatory reductions due to limits on federal authority, while Mexico will cut 250,000 acre-feet under treaty provisions.[The Guardian · Associated Press · ABC News]
  • Combined storage in Lake Mead and Lake Powell has reached historic lows, with federal managers attempting to maintain Lake Powell at or above 3,510 feet to preserve Glen Canyon Dam's hydroelectric generation.[The Guardian · Associated Press · ABC News]
  • The federal framework warns that total lower basin reductions could rise up to 3 million acre-feet annually over the next decade depending on hydrological conditions.[The Guardian · ABC News]

What remains uncertain

  • Whether the seven basin states can finalize a long-term consensus plan before the current operating guidelines expire in October remains unknown.[The Guardian · Associated Press]
  • Legal experts and state officials caution that lower basin states may file interstate lawsuits against upper basin states over water delivery obligations, potentially delaying management decisions.[The Guardian]

Sources