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.
California water regulators are praising some Sacramento-San Joaquin Delta farmers for coming up with a program to voluntarily cut water use.
(AP) - A deadly parasite is thriving in the drought, infecting all the juvenile chinook salmon in the Klamath River in Northern California as they prepare to migrate to the ocean.
The State Water Resources Control Board is considering whether to allow some farmers in the Sacramento-San Joaquin Delta to voluntarily cut back their water use. In exchange, they want the board to agree not to curtail their remaining water.
After it was called off in 2014 due to the drought, Old Town Sacramento's Gold Rush Days is back in 2015.
For the first time in its history, the city of Roseville is limiting outdoor watering to two days a week.