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.
Continued drought brings drawdown of groundwater in California, other western states.
High school football concussions, tax relief on home loan modifications, and homeowners association watering requirements – all subjects of bills signed Monday by California Gov. Jerry Brown.
California has approved tough new water restrictions, but how they’ll be enforced depends on where you live.
Many people living in small Central Valley communities in California are watching their wells run dry. US Agriculture Secretary Tom Vilsack announced more federal aid to help those hurt by the drought.
AP - U.S. Agriculture Secretary announced drought aid to help rural Californians.