Wash. Rev. Code § 36.70B.130
A local government planning under RCW 36.70A.040 shall provide a notice of decision that also includes a statement of any threshold determination made under chapter 43.21C RCW and the procedures for administrative appeal, if any. The notice of decision may be a copy of the report or decision on the project permit application. The notice shall be provided to the applicant and to any person who, prior to the rendering of the decision, requested notice of the decision or submitted substantive comments on the application. The local government shall provide for notice of its decision as provided in RCW 36.70B.110(4), which shall also state that affected property owners may request a change in valuation for property tax purposes notwithstanding any program of revaluation. The local government shall provide notice of decision to the county assessor's office of the county or counties in which the property is situated.
RCW 36.70B.130