Cal. Educ. Code § 45243

In any district that has adopted this article there shall be appointed a personnel commission composed of three members. If two or more districts are under the jurisdiction of governing boards of identical personnel, only one commission shall be appointed. In those cases this article shall apply alike to all of the districts, and the expenses of the commission shall be paid out of the general funds of all of the districts in proportion to the benefits derived therefrom as determined by the governing board.