Wash. Admin. Code § 230-03-052
(2) The registered agent must have a physical Washington state address at which the agent is available for service of process and be:
[Statutory Authority: RCW 9.46.070. WSR 14-21-081 (Order 705), § 230-03-052, filed 10/13/14, effective 1/1/15; WSR 08-20-007 (Order 630), § 230-03-052, filed 9/18/08, effective 1/1/09.]