California Code, Family Code - FAM § 17454

(a) At least 45 days before sending a notice to withhold, the department shall request that a depository institution provide the department with a designated address for receiving notices to withhold.

(b) Once the depository institution has specified a designated address pursuant to subdivision (a), the department shall send all notices to that address unless the depository institution provides notification of another address.  The department shall send all notices to withhold to a new designated address 30 days after notification.

(c) If a notice to withhold is mailed to the branch where the account is located or principal banking office, the depository institution shall be liable for a failure to withhold only to the extent that the accounts can be identified in information normally maintained at that location in the ordinary course of business.

(d) The department may by notice, served by magnetic media, electronic transmission, or other electronic technology, require any depository institution, as defined in the Federal Reserve Act (12 U.S.C.A. Sec. 461 (b)(1)(A)), that the department, in its sole discretion, has reason to believe may have in its possession, or under its control, any credits or other personal property or other things of value, belonging to a child support obligor, to withhold, from the credits or other personal property or other things of value, the amount of any child support delinquency, and interest, due from an obligor and transmit that amount withheld to the department at the times that it may designate, but not less than 10 business days from receipt of the notice.  The notice shall state the amount due from the obligor and shall be delivered or transmitted to the branch or office reported pursuant to subdivision (a), or other address designated by that depository institution for purposes of the department serving notice by magnetic media, electronic transmission, or other electronic technology.

(e) For purposes of this section, the term “address” shall include telephone or modem number, facsimile number, or any other number designated by the depository institution to receive data by electronic means.