Cal. ELEC § 14052

(a) Except as provided in subdivision (b), a political subdivision shall not hold an election other than on a statewide election date if holding an election on a nonconcurrent date has previously resulted in a significant decrease in voter turnout. (b) A political subdivision may hold an election other than on a statewide election date if, by January 1, 2018, the political subdivision has adopted a plan to consolidate a future election with a statewide election not later than the November 8, 2022, statewide general election.