California Code, Penal Code - PEN § 29815

(a) Any person who, as an express condition of probation, is prohibited or restricted from owning, possessing, controlling, receiving, or purchasing a firearm and who owns, purchases, receives, or has in possession or under custody or control, any firearm, but who is not subject to Section 29805 or subdivision (a) of Section 29800, is guilty of a public offense, which shall be punishable by imprisonment in a county jail not exceeding one year or in the state prison, by a fine not exceeding one thousand dollars ($1,000), or by both that imprisonment and fine.

(b) The court, on forms provided by the Department of Justice, shall notify the department of persons subject to this section. The notice shall include a copy of the order of probation and a copy of any minute order or abstract reflecting the order and conditions of probation.