Cal. Veh. Code § 11103.1
An all-terrain vehicle safety training organization shall maintain bodily injury and property damage liability insurance on motor vehicles while being used in all-terrain vehicle safety instruction, insuring the liability of the organization, the instructors, and any person taking instruction in at least the following amounts:
(c) Fifty thousand dollars ($50,000) for damage to property of others in any one accident.
This section shall become operative on July 1, 1988.