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.
An odd assortment of corporations, nonprofits, environmental and agricultural groups have joined forces to help increase California’s water supply.
A new study shows that forest fires have doubled in the West because of climate change.
Statewide water conservation dropped below 18 percent in August.
Improved drought conditions and more renewables lead to decrease in natural gas use this summer.
Californians' water use kept creeping back up in July after the lifting of mandatory statewide conservation orders for the drought.