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.
The drought is changing the size and flavor of California's fruit.
California's drought is having a devastating effect on its forests -- 20 million dead trees and counting, according aerial surveys. And the drought has a partner in crime -- the pine beetle.
Californians are exceeding Governor Jerry Brown's 25 percent conservation mandate.
(AP) - A group of nonprofit organizations and businesses has started a crowdfunding campaign to assist families affected by the state's drought and wildfires.
Extreme drought expanded in the Western U.S. and the drought is taking a toll on topsoil moisture in California.