Cal. Gov. Code § 57129

Where any records of a city or a district are required for the purpose of calling, holding, or conducting any special election called by the board of supervisors or city council pursuant to this division, those records or certified copies of those records shall be delivered, upon request, to the elections official by the city or district officer having custody of the records or copies and shall be returned to that officer immediately after the canvass of the election returns. All other election records, documents, instruments, and election supplies, including, but not limited to, rosters, ballots, and tally sheets, shall be retained or disposed of by the elections official in the manner provided by law.