Washington Revised Code Title 35. Cities and Towns § 35.16.040. Ordinance to reduce boundaries

Promptly after the filing of the abstract of votes with the office of the secretary of state, the legislative body of the city or town shall adopt an ordinance defining and fixing the corporate limits after excluding the area as determined by the election. The ordinance shall also describe the excluded territory by metes and bounds or by reference to a recorded plat or government survey and declare it no longer a part of the city or town.