State water officials yesterday told more than a hundred senior rights holders in California's Sacramento, San Joaquin and delta watersheds to stop pumping from those waterways.
The move by the State Water Resources Control Board marked the first time that the state has forced large numbers of holders of senior-water rights to curtail use. Those rights holders include water districts that serve thousands of farmers and others.
The move shows California is sparing fewer and fewer users in the push to cut back on water using during the state's four-year drought.
The order applies to farmers and others whose rights to water were staked more than a century ago. Many farmers holding those senior-water rights contend the state has no authority to order cuts.
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The reductions are enforced largely on an honour system because there are few meters and sensors in place to monitor consumption.
California already has ordered cuts in water use by cities and towns and by many other farmers.
One group of farmers with prized claims have made a deal with the state to voluntarily cut water use by 25 per cent to be spared deep mandatory cuts in the future.
The San Joaquin River watershed runs from the Sierra Nevada to San Francisco Bay and is a key water source for farms and communities.