Read the 2020 GSI Program Accomplishments Summary

Why 700 Million Gallons?

In Seattle, we’ve set a goal to manage 700 million gallons of polluted runoff per year with green stormwater infrastructure (GSI) by 2025. We’re doing this because GSI provides benefits to our communities. Explore this website to learn more about GSI’s benefits and how you can help reach this goal.



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.



GSI Map Preview

Go to GSI Map

Explore the GSI projects around Seattle

See projects by type or goal

Click on individual projects to see more information