SR 14, SR 141 & SR 142 – Stormwater Retrofits - Complete November 2023

In spring 2019, the Washington State Department of Ecology issued WSDOT a Municipal Stormwater Permit (permit) that regulates stormwater runoff from paved surfaces. The permit requires us to implement a Stormwater Management Program comprised of the program requirements listed in the permit.

Statewide, WSDOT oversees more than 7,000 miles of highway. When rest areas, ferry terminal holding lots, and park and ride lots are included, we manage over 40,000 acres of paved surfaces. Paved surfaces do not allow water to penetrate into the ground where it can be naturally filtered and treated before entering streams or underground water supplies. This lack of infiltration results in excess stormwater running off state highway facilities each year.