Cal. Health and Safety Code § 120175.5

(a) During an outbreak of a communicable disease, or upon the imminent and proximate threat of a communicable disease outbreak or epidemic that threatens the public’s health, a local health officer shall do both of the following: (1) Promptly notify and update governmental entities within the local health officer’s jurisdiction about communicable diseases listed in Section 2500 of Title 17 of the California Code of Regulations that may affect them, if, in the opinion of the local health officer, action or inaction on the part of the governmental entity might affect outbreak response efforts. (2) Make any relevant information available to governmental entities, including, but not limited to, the locations of concentrations of cases, the number of residents affected, and the measures that the governmental entities should take to assist with outbreak response efforts. (b) In addition to the actions required under subdivision (a), the local health officer may issue orders to other governmental entities within the local health officer’s jurisdiction to take any action the local health officer deems necessary to control the spread of the communicable disease. (c) A local health officer that provides the notification and information to a governmental entity pursuant to subdivision (a), and the governmental entity that receives the notification and information, shall comply with all applicable state and federal privacy laws.