Cal. Food & Agric. Code § 33171

In areas in which an approved milk inspection service has not been designated by the director pursuant to Article 4 (commencing with Section 33141), the director shall establish and conduct a milk inspection service for inspection of dairy farms. In all areas the director shall establish and conduct a milk inspection service for inspection of milk products plants, and for inspection of the facilities of distributors that obtain milk and milk products from a milk products plant not subject to the jurisdiction of the director.