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We’re making changes to the Elliott West Wet Weather Treatment Station (EWWTS)! EWWTS is a combined sewer overflow (CSO) facility that stores and treats sewage and stormwater during periods of heavy rain. EWWTS needs an upgrade to meet stricter environmental regulations, keep up with the demands of a growing population, and handle a changing climate.
We are in the process of creating and sharing design proposals while gathering community feedback. We just finished the 30% design phase in early 2025. This meant we created over 1,000 drawings that show the future site's potential layout and configuration. These early drawings give details about the design and size of the wastewater treatment equipment, electrical facilities, building architecture, landscaping, and structural elements.
Figure 1: A rendering of the future EWWTS facility
Figure 2: A rendering of the future EWWTS facility
Our team is interested in your input on the proposed station design. We want to hear your preferences, opinions, and concerns before we proceed to the next phase of design. We are offering online briefings for nearby residents, businesses, and local organizations or councils that would like to learn more about the 30% project phase.
Upcoming online briefing dates are:
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May 29 at 7 pm: register here
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June 12 at 7 pm: register here
If you or your organization are unable to attend one of these dates, please contact Ryan Harlow at rharlow@kingcounty.gov or 206-848-0814 to schedule a time to meet with us.
After completing the briefings, our project team will share the collected feedback with the design team for consideration. We will present the updated design concepts in an online open house in early fall, where we’ll collect more feedback from you to inform the 60% design expected to be complete in March of 2026.
Joining this email list is the best way to stay updated about EWWTS. To receive project updates via text or email, click here to sign up.
Wastewater Treatment Division
Department of Natural Resources and Parks
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