Cal. Pub. Util. Code § 70060
The governing body of the district shall consist of the members of the board of supervisors and two members, who shall be a mayor or councilman of a city, selected by the city selection committee which selects the city members of the local agency formation commission in the county pursuant to Chapter 6.6 (commencing with Section 54773) of Part 1, Division 2, Title 5, of the Government Code. The chairman of the board of supervisors shall be the chairman of the board of directors of the district. The county auditor shall be ex officio auditor of the district, the county tax collector-treasurer shall be ex officio tax collector-treasurer of the district and the county clerk shall be the ex officio clerk of the district.
Ca. Pub. Util. Code § 70060