Cal. Welf. & Inst. Code § 363

If the parent or person legally responsible for the care of any minor who is found to be a person described in Section 300 receives public assistance or care, any portion of which is attributable to the minor, a copy of the order of the court providing for the removal of the minor from his or her home shall be furnished to the appropriate social services official, who shall reduce the public assistance and care furnished the parent or other person by the amount attributable to the minor.