Drainage & Sewer Plans

Drainage and wastewater systems shape Seattle in essential, invisible ways. Everyone in Seattle relies on a vast stormwater drainage and wastewater sewerage system. Seattle Public Utilities (SPU) builds and manages the drainage and wastewater systems that affect how water flows in, out, and around our city. Learn more about the sewer and drainage systems at work in your neighborhood in our interactive StoryMap, the Power of Water.

Seattle Public Utilities (SPU) develops drainage and wastewater plans about current and future management and operations, to meet regulation, and to preparing our drainage and wastewater systems for future challenges like growth and climate change.

• Shape Our Water, a community-centered project about the next 50 years of resilient drainage and wastewater systems
• Stormwater Management Plan, highlighting our work to protect stormwater quality
• Plan to Protect Seattle's Waterways, a long-range plan and comprehensive strategy to protect Seattle's waterways from pollution