Cal. Fam. Code § 17401
If the parent who is receiving support enforcement services provides to the local child support agency substantial, credible, information regarding the residence or work address of the support obligor, the agency shall initiate an establishment or enforcement action and serve the defendant, if service is required, within 60 days and inform the parent in writing when those actions have been taken. If the address or any other information provided by the support obligee is determined by the local child support agency to be inaccurate and if, after reasonable diligence, the agency is unable to locate and serve the support obligor within that 60-day period, the local child support agency shall inform the support obligee in writing of those facts. The requirements of this section shall be in addition to the time standards established by the Department of Child Support Services pursuant to subdivision (l) of Section 17400.
Ca. Fam. Code § 17401