Pearl Street Drainage Improvement

Seattle Public Utilities is working on a capital improvement project to upgrade the combined sewer infrastructure in Seattle’s west Beacon Hill neighborhood.

The goal of the Pearl Street Drainage Improvement Project is to reduce storm-related sewer backups and flooding in the area, which will help protect public health and the environment as well as improve service reliability.

This improvement project will involve:

  • Installing a new sewer pipe along Corson Avenue S. from S. Ferdinand to S. Bennett streets
  • Building an underground storage tank to capture sewage and stormwater during large storm events and then slowly release it into the pipes along S. Dawson Street
  • Constructing a small facility building on the south side of the intersection of Corson Avenue S. and S. Dawson Street
  • Installing aboveground electrical cabinets on the north side of S. Dawson Street

What’s Happening Now?

The Pearl Street Drainage Improvement project is currently in design, which is anticipated to go through 2019.

On March 23, SPU hosted a community Open House, and had the opportunity to meet with residents to discuss the project and gather feedback to inform design and construction planning.

If you weren’t able to attend the Open House, please review the Open House Display Boards and Project Fact Sheet for more information and email the Project Manager, Luis Ramirez, at with your feedback or comments.

SPU will continue to provide updates to the community during design and construction. To receive updates about this project, please click or tap the link under “Connect” on the right-hand side of this page to sign up for the project email list.

Project Goals and Benefits

The Pearl Street Drainage Improvements project aims to reduce storm-related sewer backups and flooding in Seattle’s West Beacon Hill neighborhood.

Project Documents