Cal. Gov. Code § 26809

Unless another provision of law requires a longer retention period, the county clerk may destroy or otherwise dispose of any paper or document filed with or submitted to him or her more than one year previously, if he or she determines that there is no need for its retention. In determining whether there is a need for retaining a paper or document, consideration shall be given to such factors as future public need, the effect of statutes of limitation, and historical significance.