RCW 89.30.181: Drainage system—Benefit to public road or city sewer system—Assessment.

Whenever any drainage improvement constructed under the provisions of this chapter results in benefit to the whole or any part of a public road, road bed or track thereof, or will facilitate the construction or maintenance of any sewer system in any city or town, the state, county, city, town or subdivision or any of them responsible for the maintenance of said public road, or sewer, shall be liable for assessment for the cost and maintenance of such drainage improvement.