Wash. Rev. Code § 35.17.010
The commission form of city government means a city government in which the legislative powers and duties are exercised by a commission of three, consisting of a mayor, a commissioner of finance and accounting, and a commissioner of streets and public improvements, and in which the executive and administrative powers and duties are distributed among the three departments as follows:
[ 1965 c 7 s 35.17.010. Prior: (i) 1911 c 116 s 11, part; RRS s 9100, part. (ii) 1943 c 25 s 3, part; 1911 c 116 s 12, part; Rem. Supp. 1943 s 9101, part.]