Welfare and Institutions Code § 10600

It is hereby declared that provision for public social services in this code is a matter of statewide concern. The department is hereby designated as the single state agency with full power to supervise every phase of the administration of public social services, except health care services and medical assistance, for which grants-in-aid are received from the United States government or made by the state in order to secure full compliance with the applicable provisions of state and federal laws.