Wash. Rev. Code § 46.29.060
The provisions of this chapter, requiring deposit of security and suspensions for failure to deposit security, subject to certain exemptions, shall apply to the driver and owner of any vehicle of a type subject to registration under the motor vehicle laws of this state which is in any manner involved in an accident within this state, which accident has resulted in bodily injury or death of any person or damage to the property of any one person to an apparent extent equal to or greater than the minimum amount established by rule adopted by the director. The director shall adopt rules establishing the property damage threshold at which the provisions of this chapter apply with respect to the deposit of security and suspensions for failure to deposit security. Beginning October 1, 1987, the property damage threshold shall be five hundred dollars. The thresholds shall be revised when necessary, but not more frequently than every two years. The revisions shall only be for the purpose of recognizing economic changes as reflected by an inflationary index recommended by the office of financial management. The revisions shall be guided by the change in the index for the time period since the last revision and by the threshold established by the chief of the Washington state patrol for the filing of accident reports as provided in RCW 46.52.030.
RCW 46.29.060