Washington Revised Code Title 18. Businesses and Professions § 18.106.155. Reciprocity

The director may, upon payment of the appropriate fees, grant a certificate of competency without examination to any applicant who is a registered journey level plumber or specialty plumber in any other state whose requirements for registration are at least substantially equivalent to the requirements of this state, and which extends the same privileges of reciprocity to journey level plumbers or specialty plumbers registered in this state.