CA Veh Code Section 40206

(a)

If the payment of the parking penalty is not received by the person authorized to receive a deposit of the parking penalty by the date fixed on the notice of parking violation under Section 40202, the processing agency shall deliver to the registered owner a notice of delinquent parking violation.

(b)

Delivery of a notice of delinquent parking violation under this section may be made by personal service or by first-class mail addressed to the registered owner, as shown on records of the Department of Motor Vehicles.