Cal. Pub. Util. Code § 10251
Any person who injures or destroys, through want of proper care, any necessary or useful facility or equipment of any municipal corporation is liable to the municipal corporation for all damages sustained thereby. The measure of damages to the facility or equipment injured or destroyed shall be the cost to repair or replace the property injured or destroyed including direct and allocated costs for labor, materials, supervision, supplies, tools, taxes, transportation, administrative and general expense and other indirect or overhead expenses, less credit, if any, for salvage. The specifying of the measure of damages for the facility or equipment shall not preclude the recovery of such other damages occasioned thereby as may be authorized by law.
Ca. Pub. Util. Code § 10251