Cal. Elec. Code § 10002
The governing body of any city or district may by resolution request the board of supervisors of the county to permit the county elections official to render specified services to the city or district relating to the conduct of an election. Subject to approval of the board of supervisors, these services shall be performed by the county elections official.
The resolution of the governing body of the city or district shall specify the services requested.
Any city that requests the board of supervisors to permit the elections official to prepare the city's election materials shall, if the board of supervisors agrees to provide such services, supply the county elections official with a list of its precincts, or consolidated precincts, as applicable, no later than 61 days before the election.
Unless other arrangements satisfactory to the county have been made, the city or district shall reimburse the county in full for the services performed upon presentation of a bill to the city or district.
Ca. Elec. Code § 10002