Wash. Rev. Code § 35A.63.072
Within sixty days from its receipt of the recommendation for the comprehensive plan, as above set forth, the legislative body at a public meeting shall consider the same. The legislative body within such period as it may by ordinance provide, shall vote to approve or disapprove or to modify and approve, as modified, the comprehensive plan or to refer it back to the planning agency for further proceedings, in which case the legislative body shall specify the time within which the planning agency shall report back to the legislative body its findings and recommendations on the matters referred to it. The final form and content of the comprehensive plan shall be determined by the legislative body. An affirmative vote of not less than a majority of total members of the legislative body shall be required for adoption of a resolution to approve the plan or its parts. The comprehensive plan, or its successive parts, as approved by the legislative body, shall be filed with an appropriate official of the code city and shall be available for public inspection.
RCW 35A.63.072