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.
Spring storms help Sierra Nevada snowpack, but there is no reduction in drought conditions in California and Nevada.
More "Spare The Air" alerts may be issued this year in the Sacramento region because the Environmental Protection Agency has lowered the federal ozone health standard.
Weather permitting, the Tahoe Douglas Fire Protection District and the U.S. Forest Service may continue prescribed fire operations starting Monday in areas around Lake Tahoe.
(AP) — Storms brought deep snow to the mountains that feed the vital Colorado River this season, but the dried-out landscape will soak up some of it before it can reach the river.
(AP) - California water managers say they're easing cutbacks as spring storms boost reservoirs in the state's five-year drought.