Cal. Gov. Code § 8653

In the event that the Governor, during a state of war emergency or a state of emergency and in the exercise of the emergency powers vested in him, shall order the officers, employees, or agencies of any county, city and county, city, or district to perform duties outside of the territorial limits of their respective agencies, any services performed or expenditures made in connection therewith by any such agency shall be deemed conclusively to be for the direct protection and benefit of the inhabitants and property of such agency. During a state of war emergency or a state of emergency in the event that any equipment owned, leased, or operated by any county, city and county, city, or district, is damaged or destroyed while being used outside of the territorial limits of the public agency owning such equipment, the public agency suffering loss shall be entitled to file a claim for the amount thereof against the State of California in the manner provided in Section 8652. Such agency shall have no claim against the state for services of such personnel or for the rental, use, or ordinary wear and tear of such equipment, except such extraordinary services incurred by local governmental agencies in executing mutual aid agreements.