The Ukiah Daily Journal reports that the county's Board of Supervisors on Tuesday voted unanimously to make the declaration, citing an "imminent threat of disaster" from drought conditions.
The state Department of Water Resources said Mendocino is the first to request state drought assistance.
Officials hope the declaration will result in state funds and assistance in developing a drought plan.
Gov. Jerry Brown has convened a task force to help decide if a statewide drought emergency is warranted.
State water managers say they will be able to deliver just 5 percent of the water sought by municipal agencies and nearly a million acres of farmland.
Last year, California saw everything from intense drought to torrential rain. Researchers and water agencies say that the future of the state’s drought depends on adapting to these shifts.
As the drought dries up California’s wetlands, traveling birds such as ducks, geese and eagles are struggling to survive and breed. “This drought is bad. The odds are against us,” a state expert said.
Drought resilience depends on location but also extraordinary engineering — determining which California places are running out of water this year and which remain in good shape.
About 4,300 users were issued notices to halt diversions from the Sacramento-San Joaquin Delta.
Experts say the current drought is hotter and drier than previous ones, meaning water is evaporating faster.
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