Washington Revised Code Title 7. Special Proceedings and Actions § 7.70A.030. Selection of arbitrator

(1) An arbitrator shall be selected by agreement of the parties no later than forty-five days after:  (a) The date all defendants elected arbitration in the answer where the parties elected arbitration in the initial complaint and answer;  or (b) the date of the stipulation where the parties agreed to enter into arbitration after the commencement of the action through a stipulation filed with the court.  The parties may agree to select more than one arbitrator to conduct the arbitration.

(2) If the parties are unable to agree to an arbitrator by the time specified in subsection (1) of this section, each side may submit the names of three arbitrators to the court, and the court shall select an arbitrator from among the submitted names within fifteen days of being notified that the parties are unable to agree to an arbitrator.  If none of the parties submit any names of potential arbitrators, the court shall select an arbitrator.