Cal. Penal Code § 490.1

(a) Petty theft, where the value of the money, labor, real or personal property taken is of a value which does not exceed fifty dollars ($50), may be charged as a misdemeanor or an infraction, at the discretion of the prosecutor, provided that the person charged with the offense has no other theft or theft-related conviction.
(b) Any offense charged as an infraction under this section shall be subject to the provisions of subdivision (d) of Section 17 and Sections 19.6 and 19.7.
A violation which is an infraction under this section is punishable by a fine not exceeding two hundred fifty dollars ($250).