Fam. Code, § 5237

(a) Except as provided in subdivisions (b) and (c), the obligee shall notify the employer of the obligor, by first-class mail, postage prepaid, of any change of address within a reasonable period of time after the change.

(b) Where payments have been ordered to be made to a county officer designated by the court, the obligee who is the parent, guardian, or other person entitled to receive payment through the designated county officer shall notify the designated county officer by first-class mail, postage prepaid, of any address change within a reasonable period of time after the change.

(c) If the obligee is receiving support payments from the State Disbursement Unit as required by Section 17309, the obligee shall notify the State Disbursement Unit instead of the employer of the obligor as provided in subdivision (a).

(d) (1) Except as set forth in paragraph (2), if the employer, designated county officer, or the State Disbursement Unit is unable to deliver payments under the assignment order for a period of six months due to the failure of the obligee to notify the employer, designated county officer, or State Disbursement Unit, of a change of address, the employer, designated county officer, or State Disbursement Unit shall not make any further payments under the assignment order and shall return all undeliverable payments to the obligor.

(2) If payments are being directed to the State Disbursement Unit pursuant to subdivision (e) of Section 5235, but the case is not otherwise receiving services from the Title IV-D agency, and the State Disbursement Unit is unable to deliver payments under the assignment order for a period of 45 days due to the failure of the obligee to notify the employer, designated county officer, or State Disbursement Unit of a change of address, the Title IV-D agency shall take the following actions:

(A) Immediately return the undeliverable payments to the obligor if the obligee cannot be located.

(B) Notify the employer to suspend withholding pursuant to the wage assignment until the employer or Title IV-D agency is notified of the obligee’s whereabouts.