Welf. & Inst. Code, § 658

(a) Except as provided in subdivision (b), upon the filing of the petition, the clerk of the juvenile court shall issue a notice, to which shall be attached a copy of the petition, and he or she shall cause the same to be served upon the minor, if the minor is eight or more years of age, and upon each of the persons described in subdivision (e) of Section 656 whose residence addresses are set forth in the petition and thereafter before the hearing upon all persons whose residence addresses become known to the clerk. If the court has ordered the care, custody, and control of the minor to be under the supervision of the probation officer for foster care placement pursuant to subdivision (a) of Section 727, the clerk shall also issue a copy of that notice to any foster parents, preadoptive parents, legal guardians, or relatives providing care to the minor. The clerk shall issue a copy of the petition, to the minor’s attorney and to the district attorney, if the district attorney has notified the clerk of the court that he or she wishes to receive the petition, containing the time, date, and place of the hearing. Service under this subdivision may be by electronic service pursuant to Section 212.5, except that electronic service is not authorized if the minor is detained and those persons entitled to notice are not present at the initial detention hearing.

(b) Upon the filing of a supplemental petition where the minor has been declared a ward of the court or a probationer under Section 602 in the original matter, the clerk of the juvenile court shall issue a notice, to which shall be attached a copy of the petition, and he or she shall cause the notice to be served upon the minor, if the minor is eight or more years of age, and upon each of the persons described in subdivision (e) of Section 656 whose residence addresses are set forth in the supplemental petition and thereafter known to the clerk. The clerk shall issue a copy of the supplemental petition to the minor’s attorney, and to the district attorney if the probation officer is the petitioner, or, to the probation officer if the district attorney is the petitioner, containing the time, date, and place of the hearing. If the court has ordered the care, custody, and control of the minor to be under the supervision of the probation officer for foster care placement pursuant to subdivision (a) of Section 727, the clerk shall also issue a copy of that notice to any foster parents, preadoptive parents, legal guardians, or relatives providing care to the minor. Service under this subdivision may be by electronic service pursuant to Section 212.5.