Freshly cut off from their chief water supply, a group of California water agencies in one of the state’s most fertile farming areas sued on Wednesday to freeze the latest round of emergency drought rules.

In a lawsuit filed in Sacramento County Superior Court, the suppliers argue they were denied due process when state regulators ordered thousands of landowners last month to cease diversions from the Sacramento-San Joaquin River Delta due to drought conditions. They claim the sweeping water curtailments were based off faulty data and will cause permanent damage to pricey fruit and nut orchards.