Yes, on March 3, 2020 Governor Newsom declared a State of Emergency to help the state prepare for broader spread of coronavirus. On March 19, the California State Public Health Officer and Director of the California Department of Public Health expanded the order to require all individuals living in California to stay at home except for essential needs. The order is in effect until further notice.
This proclamation includes increased protections against price gouging, offers more assistance to local governments, and allows health care workers to come from out-of-state. You can read the proclamation at: