Cal. Pen. Code § 4205
Upon receipt of the resolution adopted under Section 4203, the boards of supervisors of the counties affected and to whom the same may be directed shall consider the advisability of creating and organizing a joint district as proposed in said resolution and, upon determining the facts involved therein, shall severally adopt resolutions either rejecting or approving the proposal to create such joint district. Each resolution of approval shall, in addition to the matter otherwise required therein, also name and appoint the member of the board of supervisors of the county adopting the resolution qualified to represent such county upon the board of directors of the proposed joint district. A certified copy of the resolution of approval shall be forthwith transmitted to the clerk of the board of supervisors initiating the proceedings.
Ca. Pen. Code § 4205