California Code, Education Code - EDC § 5340

School district governing board or community college district governing board member elections for two or more districts of any type to be held in the same district or area on the same day shall be consolidated so that a person entitled to vote in both or all of such elections may do so at the same time and place and using the same ballot.

When a consolidated election is required by this section to be held, the basic unit for conducting the election shall be the elementary district.  The county superintendent of schools having jurisdiction shall notify the governing boards of all school and community college districts in writing at least 130 days prior to the date of the election that a consolidated election is required to be held.