Wash. Rev. Code § 46.72.040
Before a permit is issued every for hire operator shall be required to deposit and thereafter keep on file with the director a surety bond running to the state of Washington covering each and every for hire vehicle as may be owned or leased by him or her and used in the conduct of his or her business as a for hire operator. Such bond shall be in the sum of one hundred thousand dollars for any recovery for death or personal injury by one person, and three hundred thousand dollars for all persons killed or receiving personal injury by reason of one act of negligence, and twenty-five thousand dollars for damage to property of any person other than the assured, with a good and sufficient surety company licensed to do business in this state as surety and to be approved by the director, conditioned for the faithful compliance by the principal of said bond with the provisions of this chapter, and to pay all damages which may be sustained by any person injured by reason of any careless negligence or unlawful act on the part of said principal, his or her agents or employees in the conduct of said business or in the operation of any motor propelled vehicle used in transporting passengers for compensation on any public highway of this state.
RCW 46.72.040