Cal. Health & Safety Code § 111020

The department, upon the request of a health officer, may authorize the local health department of a city, county, city and county, or local health district to enforce this part, and the regulations adopted pursuant to this part that pertain to retail food establishments, as defined by regulation, if the department determines that the local health department has sufficient personnel with adequate training to do so. The enforcement shall be limited to the area under the jurisdiction of the local health department.