The state has cut off the water it supplies to California's drought-plagued farms, and city officials fear urban areas will be next.

Faced with reservoirs averaging less than one-third of their normal supply, the California Water Project said Monday that all state irrigation water deliveries to farmers have been stopped.It was the first farm supply cutoff by the State Water Project, which dates back to the 1960s.

"We don't want to be delivering water that we should not be delivering due to limitations of the drought and the need to maintain water in storage, in case next year is dry," said Peter Gate, a California Water Project spokesman.

State officials also said there's a 50-50 chance the project will be able to deliver only half the water it now sells to water districts serving urban users.

"We're anticipating greater than that unless there's some big weather changes in the next few weeks," said Teddy Morse, a spokeswoman for the Santa Clara Valley Water District, which serves 1.5 million customers south of San Francisco. The county receives about one-third of its water from state supplies.