Cal. Veh. Code § 22651.3
(a) Any peace officer, as that term is defined in Chapter 4.5 (commencing with Section 830) of Title 3 of Part 2 of the Penal Code, or any regularly employed and salaried employee, who is engaged in directing traffic or enforcing parking laws and regulations, of a city, county, or jurisdiction of a state agency in which any vehicle, other than a rented vehicle, is located may remove the vehicle from an offstreet public parking facility located within the territorial limits in which the officer or employee may act when the vehicle is known to have been issued five or more notices of parking violation over a period of five or more days, to which the owner or person in control of the vehicle has not responded or when any vehicle is illegally parked so as to prevent the movement of a legally parked vehicle.
A notice of parking violation issued to a vehicle which is registered in a foreign jurisdiction or is without current California registration and is known to have been issued five or more notices of parking violation over a period of five or more days shall be accompanied by a warning that repeated violations may result in the impounding of the vehicle.