RCW 70A.15.1520: Multicounty authority may be formed by contiguous counties—Name.

The boards of county commissioners of two or more contiguous counties may, by joint resolution, combine to form a multicounty air pollution control authority. Boundaries of such authority shall be coextensive with the boundaries of the counties forming the authority.

The name of the multicounty authority shall bear the names of the counties making up such multicounty authority or a name adopted by the board of such multicounty authority.