Cal. Food & Agric. Code § 15201

The Legislature hereby finds and declares that it is the joint responsibility of the Department of Food and Agriculture, the commissioner of each county under the direction and supervision of the director, and the Structural Pest Control Board to regulate the activities of structural pest control licensees. The Structural Pest Control Board has responsibility for licensing persons and companies engaged in structural pest control work. The department has primary responsibility for enforcing pesticide laws and regulations.