Managing stormwater from state highways

Learn about how we manage stormwater runoff from paved surfaces like highways, rest areas, park-and-ride lots, ferry terminals and maintenance facilities in urban areas throughout the state.

In spring 2019, the Washington State Department of Ecology issued us a Municipal Stormwater Permit that regulates stormwater runoff from these paved surfaces. We want to hear from you!

We invite you to provide feedback on the 2020 Stormwater Management Program Plan (SWMPP) (PDF 556KB). The 2020 SWMPP describes how we will implement the 2019 permit’s requirements.

Send feedback to the Stormwater Permit Program

We will consider all comments received by October 1, 2021, before finalizing the 2021 plan.

Visit the Water resources and erosion control webpage for more information on stormwater policies, procedures and reports.

14 fish passage projects were completed in 2020

improving access to 54.2 miles of upstream habitat.

11,959 incidents responded to

by WSDOT’s incident Response teams during second quarter of 2021, 15% more than same quarter in 2020.

41 Pre-existing Funds Projects Advertised

during the eighth quarter of the 2019-2021 biennium.