California Code, Family Code - FAM § 17456

(a) Any person required to withhold and transmit any amount pursuant to this article shall comply with the requirement without resort to any legal or equitable action in a court of law or equity. Any person paying to the department any amount required by it to be withheld is not liable therefore to the person from whom withheld unless the amount withheld is refunded to the withholding agent. However, if a depository institution, as defined in the Federal Reserve Act (12 U.S.C.A. Sec. 461(b)(1)(A)) withholds and pays to the department pursuant to this article any moneys held in a deposit account in which the delinquent obligor and another person or persons have an interest, or in an account held in the name of a third party or parties in which the delinquent obligor is ultimately determined to have no interest, the depository institution paying those moneys to the department is not liable therefore to any of the persons who have an interest in the account, unless the amount withheld is refunded to the withholding agent.

(b) In the case of a deposit account or accounts for which this notice to withhold applies, the depository institution shall send a notice by first-class mail to each person named on the account or accounts included in the notice from the department, provided that a current address for each person is available to the institution. This notice shall inform each person as to the reason for the hold placed on the account or accounts, the amount subject to being withheld, and the date by which this amount is to be remitted to the department. An institution may assess the account or accounts of each person receiving this notice a reasonable service charge not to exceed three dollars ($3).