California Code, Family Code - FAM § 4352

(a) Insofar as expenses of the county officer designated by the court and expenses of the local child support agency incurred in the enforcement of an order referred by the court under this chapter exceed any service charge imposed under Section 279 of the Welfare and Institutions Code, the expenses are a charge upon the county where the proceedings are pending.

(b) Fees for service of process in the enforcement of an order referred by the court under this chapter are a charge upon the county where the process is served.