Water resources & erosion control

Managing the affects our daily activities and construction projects have on groundwater and surface water helps WSDOT protect and improve water quality and habitat.

Find what you need to comply with groundwater, surface water, stormwater, and floodplain regulations, identify geologic conditions, and develop discipline reports for these topics. Also, find recent research and reports documenting activities required by stormwater permits.

Follow the policies and procedures on this page to help protect and improve natural habitat and water quality, manage and minimize affects from our daily activities and construction projects and comply with regulations and achieve the agency's strategic plan goal for environmental stewardship.

Proper planning can reduce stormwater-related erosion risks on construction sites. Find resources, templates, checklists and policy guidance on this page to get and transfer permit coverage, develop contracts, write erosion control plans and submit discharge monitoring reports for your project.

Identifying and reporting spills, illicit discharges and unauthorized connections that might affect the stormwater drainage system helps keep pollutants out of receiving waterbodies. We do not allow the discharge of anything other than stormwater into our stormwater drainage system, nor do we allow any pipe, ditch or other manmade structure to connect to our stormwater drainage system without authorization.

We protect and improve water quality by conducting and funding research and complying with permits. Find information on our stormwater research efforts as well as compliance activities required by the Washington State Department of Transportation Municipal Stormwater Permit and the Construction Stormwater General Permit on this page.

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.