Cal. Fam. Code § 17531

When a local child support agency closes a child support case containing summary criminal history information, the local child support agency shall delete or purge from the file and destroy any documents or information concerning or arising from offenses for or of which the parent has been arrested, charged, or convicted, other than offenses related to the parent’s having failed to provide support for minor children, no later than four years and four months, or any other timeframe that is consistent with federal regulations controlling child support records retention, after the date the local child support agency closes the case.