California Code, Health and Safety Code - HSC § 11795

(a) The board of supervisors of each county may apply to the department for funds for the purpose of alleviating problems in its county related to alcohol abuse and other drug use. This part applies only to counties receiving state or federal funds allocated by the department under this part.

(b) The department shall coordinate state and local alcohol and other drug use prevention, including care, treatment, and rehabilitation programs, for individuals with substance use disorders. It is the intent of the Legislature that the department and the counties maintain a cooperative partnership to ensure effective implementation of this chapter.

(c) The Legislature grants responsibility to the county to administer and coordinate all county alcohol and other drug programs funded under this part. County alcohol and other drug programs shall account to the board of supervisors and to the state for their effective implementation. The county shall establish its own priorities for alcohol and other drug programs funded under this part, except with respect to funds that are allocated to the county for federally required programs and services.