California Code, Health and Safety Code - HSC § 101285

(a) Notwithstanding Section 101260, the county board of supervisors may, with the concurrence of the county officer providing the services, transfer all or any portion of the function of providing vector control services to any mosquito abatement and vector control district formed pursuant to the Mosquito Abatement and Vector Control District Law, Chapter 1 (commencing with Section 2000) of Division 3, provided that the district's boundaries include that territory.

(b) A county that transfers vector control services to a district shall continue to receive funds appropriated for the purposes of this article if that county complies with all of the other minimum standards and if the vector control program is maintained at a level that meets the minimum standards set by the department.