Why 700 Million Gallons?
As we replace forests and natural areas with buildings, streets, and yards, we still need to manage the runoff from rain, storms, and snowmelt. We can accomplish this by taking cues from nature itself, using green stormwater infrastructure (GSI) to clean runoff before it arrives in our wastewater system and waterways. Our goal is to use GSI to manage 700 million gallons of polluted water each year by 2025.
Keep reading to find out how you can partner with us towards this goal! Together, we can improve the health of our communities
PROGRESS
How are we doing?
Seattle is making great strides toward our goal to naturally manage 700 million gallons of stormwater annually by 2025. We are currently managing 742 million gallons annually!
Green stormwater infrastructure helps make our roads, rooftops and other hard surfaces work more like the forests and natural areas we have lost over time.
Learn more about the progress made in the 2023 year-end accomplishment highlights.
Progress through 2024 Q4

KEY PLAYERS & PARTNERS
Partnerships for Greater Impact

Green Infrastructure Partnership
A cross-sector group that delivers green solutions to stormwater pollution with education, technical assistance, and incentive programs.

City Habitats Coalition
Over 100 partners collaborate on policy and funding opportunities to build a movement around nature-based solutions, implement on-the-ground projects to address stormwater pollution, and much more.

Seattle 2030 District Partnership
A high-performance building district in downtown Seattle that aims to reduce environmental impacts of building construction and operations.

12,000 Rain Gardens
Promotes green infrastructure solutions and resources that communities can adopt to actively help environmental problems stemming from polluted stormwater runoff.

The Green Infrastructure Leadership Exchange
A national practitioner network that supports communities that want to implement stormwater infrastructure programs with peer learning, innovation and implementation.
GSI Around You
Hundreds of GSI projects have been built in Seattle over the past two decades. Click on this map to see each project organized by type, goal, and who built it.
Click on a dot to see more information about the project. You can learn more about current City of Seattle projects here and completed projects here. Learn about current King County projects here.