California Code, Government Code - GOV § 6103.9

(a) Notwithstanding any other provision of law, except as provided in this section, the local child support agency and the district attorney shall be exempt from the payment of any fees, including fees for service of process and filing fees, in any action or proceeding brought for the establishment of a child support obligation or the enforcement of a child or spousal support obligation.

(b) A court or county may be reimbursed for those direct costs related to the establishment of a child support obligation or the enforcement of a child or spousal support obligation which have been agreed to pursuant to a plan of cooperation.  Any reimbursement pursuant to a plan of cooperation shall not include any amount which is payable as a filing fee.

(c) For purposes of this section, a “plan of cooperation” includes an agreement entered into by a court and the Administrative Office of the Courts of the California Judicial Council which provides for reimbursement for the cost of providing clerical and administrative support furnished by the court.