California Code, Government Code - GOV § 27208

If a paper or document has been microfilmed, the county recorder may destroy or otherwise dispose of any paper or document filed with or submitted to him or her more than one year previously, unless another provision of law requires a longer retention period or unless the recorder determines that there is a need for its retention. In determining where there is a need for retaining a paper or document, consideration shall be given to factors, including, but not limited to, future public need, the effect of statutes of limitation, and historical significance.