Cal. Health and Safety Code § 18871

It is unlawful for any person to use or cause, or permit to be used for occupancy, any of the following manufactured homes, mobilehomes, park trailers, or recreational vehicles in a park or recreational vehicles outside of special occupancy parks: (a) Any recreational vehicle, park trailer, mobilehome, or manufactured home supplied with fuel, gas, water, electricity, or sewage connections, unless the connections and installations conform to regulations of the department. (b) Any recreational vehicle, mobilehome, or manufactured home that is permanently attached with underpinning or foundation to the ground, except for a mobilehome or manufactured home bearing a department insignia or federal label that is installed in accordance with Part 2.1 (commencing with Section 18200), and any recreational vehicle, mobilehome, manufactured home, or park trailer that is not in compliance with Sections 18027.3 and 18871.5. (c) Any recreational vehicle, mobilehome, or manufactured home in an unsafe or unsanitary condition or that is structurally unsound and does not protect its occupants against the elements. (d) Any mobilehome or manufactured home that does not conform to the registration requirements of the department.