California Code, Business and Professions Code - BPC § 7040

(a) This chapter does not apply to an authorized representative of the United States government, the State of California, any federally recognized tribe or participating tribe acting within tribal jurisdiction, or any incorporated town, city, county, irrigation district, reclamation district, or other municipal or political corporation or subdivision of this state when the entity or its representative is acting within the scope of the entity's or representative's official capacity.

(b) Nothing in this section authorizes the entity or its authorized representative thereof either to enter into or authorize a contract with an unlicensed contractor for work that is required by this chapter to be performed by a licensed contractor.