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Nevada sues federal government over Colorado River water reduction plan

The state claims a federal plan reduces lower basin supplies while placing no mandatory cutbacks on upper basin states.

The short version

  • Nevada, alongside state and local water authorities, filed a lawsuit challenging the Department of the Interior's plan for the Colorado River.
  • The federal framework reduces water supplies to lower basin states—Nevada, Arizona, and California—by about 20% over two years.
  • Nevada Governor Joe Lombardo claimed the plan could strip Southern Nevada of over 70% of its allocation while requiring no cuts from upper basin states.
  • The legal challenge risks creating prolonged courtroom disputes that could delay critical environmental and water management decisions.

Key facts

  • Nevada, the Colorado River Commission of Nevada, and the Southern Nevada Water Authority filed a federal lawsuit against the US Department of the Interior and the Bureau of Reclamation.[The Guardian]
  • The federal plan announced on Friday cuts lower basin state water supplies by approximately 20% over two years.[The Guardian]
  • The Colorado River provides water for 40 million people, dozens of tribes, and 5.5 million acres of farmland across the American West.[The Guardian]
  • Nevada Governor Joe Lombardo stated Southern Nevada risks losing more than 70% of its share under the framework while upper basin states face no mandatory reductions.[The Guardian]
  • Arizona officials have also strongly objected to the federal plan, alleging it violates the 1922 Colorado River Compact.[The Guardian]

What remains uncertain

  • It remains uncertain whether other states will join Nevada in suing the federal government or file direct legal challenges against upper basin states.[The Guardian]
  • Whether courts will hold upper basin states accountable for delivery reductions driven by climate conditions remains legally unsettled.[The Guardian]

Sources