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Elliott West Wet Weather Treatment Station upgrade
King County is planning to upgrade the Elliott West Wet Weather Treatment Station (EWWTS). The upgrade will ensure compliance with stricter environmental regulations, meet the demands of a growing population, and handle a changing climate.
Project description
The Elliott West Wet Weather Treatment Station (EWWTS) is a combined sewer overflow (CSO) facility that was first completed in 2005. Since then, it has stored and treated sewage and stormwater during periods of heavy rain. EWWTS now needs to be upgraded to meet stricter environmental standards and to adapt to changing climate.
This project will ensure that the upgraded facility meets its permit requirements. This is a major investment to ensure King County continues to protect public health and the environment for years to come.
More information about the upgrade plans will be available this summer and fall. To stay updated, subscribe to our email list.
Project update
January 21, 2025
Loud Maintenance Work at Elliott West January 21 – 24.
Work Hours: 7:00 a.m. - 8:00 p.m.
The Elliott West Facility is located at 601 Elliott Ave W. in Seattle. Maintenance crews will be replacing a gasket on a pipe within the facility. Crews will need to use vactoring (vacuuming) trucks to perform part of the work.
Vactor trucks are loud but required to make the work area safe for crews.
Additional vehicles and equipment will also be at the facility to assist with the work.
Please do not attempt to enter the facility. Providing crews with space will help keep everyone safe and reduce possible delays in the work.
WTD understands that this work can be disruptive to nearby residents. We thank you for your patience.
Project schedule
Our team is in the early stages of designing the needed upgrades to EWWTS. Project timelines may change due to a number of factors. We will provide updates as our work progresses and any schedule changes are needed.