Wash. Rev. Code § 81.77.060
The commission, in granting certificates to operate a solid waste collection company, shall require the owner or operator to first procure liability and property damage insurance from a company licensed to make liability insurance in the state or a surety bond of a company licensed to write surety bonds in the state, on each motor propelled vehicle used or to be used in transporting solid waste for compensation in the amount of not less than twenty-five thousand dollars for any recovery for personal injury by one person, and not less than ten thousand dollars and in such additional amount as the commission shall determine, for all persons receiving personal injury by reason of one act of negligence, and not less than ten thousand dollars for damage to property of any person other than the assured, and to maintain such liability and property damage insurance or surety bond in force on each motor propelled vehicle while so used. Each policy for liability or property damage insurance or surety bond required herein shall be filed with the commission and kept in full force and effect and failure so to do shall be cause for revocation of the delinquent's certificate.
RCW 81.77.060