New development an important strategy in solving stormwater

Treatment of stormwater is critical to protecting marine life

A developer, with the help of Salmon Safe and other partners, integrated green stormwater infrastructure into a new development’s landscaping to treat runoff from the Aurora Bridge, going above and beyond requirements. This effort became the first phase of the recently completed Aurora Bridge Bioswale Project, which treats two million gallons of stormwater annually.

The project treats stormwater runoff which includes 6PPD, a toxic chemical that is present in all types of tires. 6PPD has recently been found to be particularly harmful for salmon. Bioswales can effectively remove this toxin from runoff before it runs into Puget Sound water bodies.

With the Aurora Bridge Bioswale Project completed, a feasibility study has begun for a similar project under the Interstate 5 Ship Canal Bridge. The project could potentially prevent 98 million gallons of contaminated water from entering Lake Union each year.

To help with incentivizing these types of projects, PSRC partnered with the Department of Commerce to develop the Building Green Cities guide. The guide includes a series of tools, including Best Management Practice factsheets, information about incentive programs, and other resources.