Cal. Health & Saf. Code § 7700
The governing body of any city or city and county, having a population of more than one hundred thousand persons, may order the disinterment and removal of all human remains interred in all or any part of any cemetery of more than five acres in extent situated within its limits, where the right of interment in the cemetery has been prohibited by law for a period of fifteen years or more, whenever the governing body, by ordinance, declares that the further maintenance of all or any part of the cemetery as a burial place for the human dead threatens or endangers the health, safety, comfort or welfare of the public and demands the disinterment and removal beyond the limits of the city, or city and county, of the human remains interred therein.
Ca. Health and Saf. Code § 7700