Cal. Elec. Code § 10522

At least 125 days prior to the day fixed for the general district election, the secretary of a resident voting district shall deliver to the county elections official of each affected county a map showing the boundaries of the district and the boundaries of the divisions of the district, if any, within that county and a statement indicating in which divisions a director is to be elected and whether any elective officer is to be elected at large at the next general district election.