Cal. Gov. Code § 8609

State agencies granted authority by the Governor, the Business Continuity Task Force, the Emergency Preparedness Task Force, or the Executive Committee established by Executive Order D-3-99 to implement any type of disaster, contingency, or business continuity plan may use volunteer workers. The volunteers shall be deemed disaster service workers for the purpose of workers’ compensation under Chapter 3 (commencing with Section 3600) of Part 1 of Division 4 of the Labor Code.