Fam. Code, § 4723

(a) The notice of delinquency shall be signed under penalty of perjury by the support obligee.

(b) The notice of delinquency shall state all of the following:

(1) The amount that the child support obligor is in arrears.

(2) The installments of support due, the amounts, if any, that have been paid, and the balance due.

(3) That any unpaid installment of child support will incur a penalty of 6 percent of the unpaid support per month until paid, to a maximum of 72 percent of the original amount of the unpaid support, unless the support arrearage is paid within 30 days of the date of service of the notice of delinquency.

(c) In the absence of a protective order prohibiting the support obligor from knowing the whereabouts of the child or children for whom support is payable, or otherwise excusing the requirements of this subdivision, the notice of delinquency shall also include a current address and telephone number of all of the children for whom support is due and, if different from that of the support obligee, the address at which court papers may be served upon the support obligee.