Cal. Fam. Code § 4204
Notwithstanding any other law, in any proceeding where the court has made an order requiring the payment of child support and the child support is subsequently assigned to the county pursuant to Section 11477 of the Welfare and Institutions Code or the support obligor or obligee has requested a local child support agency to provide child support enforcement services pursuant to Section 17400, the local child support agency shall issue a notice directing that the payments shall be made to the local child support agency, another county office, or the State Disbursement Unit pursuant to Section 17309. Additionally, the local child support agency shall provide notice when it is no longer providing services under Part D of Title IV of the federal Social Security Act (42 U.S.C. Sec. 651 et seq.). The local child support agency shall serve the notice on both the support obligor and obligee in compliance with Section 1013 of the Code of Civil Procedure and file the notice with the court.
Ca. Fam. Code § 4204