The goal of the City's Surface Water Maintenance (SWM) Division is to prevent urban flooding and reduce the discharge of pollutants into streams and the Puget Sound through proactive maintenance of the drainage infrastructure.
City Drainage Standards
The 2021 King County Surface Water Design Manual has been adopted (DMMC 16.10.350) by reference as the City of Des Moines storm water standards.
2021 King County Surface Water Manual
City Pipe Program
Those street ditches can be filled! In a joint venture with the home owners, Public Works crews will provide the heavy equipment and labor to install pipes, catch basins and backfill material (gravel) to fill in the ditches if the owner pays for the materials. For those interested, a cost estimate can be obtained from
Brandon Pitts, Civil Engineer I, at (206) 870-6523 or email.
Current Capital Improvements Projects
Current Capital Improvement Projects List
Report a Concern