Drainage & Wastewater Reports

Seattle Public Utilities (SPU) compiles documents with key information about, and/or analysis of, drainage and sewer system performance including steps we are taking to address combined sewer overflows. These reports inform future investments in and decisions about Seattle’s drainage and sewer infrastructure. Note: The term “wastewater system” is used for the sewer system in these documents.

  • Shape Our Water: This page includes documents about the performance of our drainage and wastewater systems including information about system capacity, water quality, creek and shoreline health, and system pressures and shocks.

  • Combined Sewer Overflow Reports and Requirements: In compliance with our Clean Water Act permit requirements, we provide annual reports about SPU actions to improve the wastewater collection system and reduce combined sewer overflows.

Public Utilities

Andrew Lee, General Manager and CEO
Address: 700 5th Avenue, Suite 4900, Seattle, WA, 98104
Mailing Address: PO Box 34018, Seattle, WA, 98124-5177
Phone: (206) 684-3000

Newsletter Updates


Sign up for the latest updates from Public Utilities

Seattle Public Utilities (SPU) is comprised of three major direct-service providing utilities: the Water Utility, the Drainage and Wastewater Utility, and the Solid Waste Utility.