Cal. Veh. Code § 40209
If the affidavit of nonliability is returned to the processing agency within 30 calendar days of the mailing of the notice of delinquent parking violation together with the proof of a written lease or rental agreement between a bona fide rental or leasing company, and its customer which identifies the rentee or lessee and provides the driver's license number, name, and address of the rentee or lessee, the processing agency shall serve or mail to the rentee or lessee identified in the affidavit of nonliability a notice of delinquent parking violation. If payment is not received within 21 calendar days from the date of issuance of the citation or 14 calendar days after the mailing of the notice of delinquent parking violation, the processing agency may proceed against the rentee or lessee pursuant to Section 40220.
Ca. Veh. Code § 40209