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King County is starting work to address combined sewer overflows in SODO
We are doing our part to prevent pollution during wet weather. We are committed to keeping you updated along the way.
Mouth of the Duwamish Wet Weather Facilities will address pollution from five King County outfalls at the mouth of the Duwamish River. We are evaluating options that control combined sewer overflows (CSOs) to comply with environmental laws. CSO outfalls were designed many decades ago to be overflow relief points in our sewer system during periods of heavy rain. Today, we are investing in solutions to control CSOs so we can protect homes and businesses while improving water quality.
 On dry days, wastewater goes directly to a treatment plant to be cleaned.
 When heavy rainstorms overload pipes with stormwater, the flow is temporarily diverted through a combined sewer overflow (CSO) outfall into a local water body. This prevents wastewater backups into homes and businesses.
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The SODO Neighborhood
The five King County outfalls included in this planning process are located in the east and west waterways of the Duwamish River. They are on both sides of Harbor Island and along the shoreline of Elliott Bay (see map below).
 King County is seeking to understand the feasible options to control pollution from these outfalls and meet regulatory and environmental requirements. These solutions, or system alternatives, will likely include a combination of the following methods:
Store it: Building underground tanks, tunnels, or pipes to store flows during heavy storms.
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Treat it: Building treatment stations to treat flows that are too large.
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Move it: Building new pipelines or increasing the size of existing pipelines.
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We anticipate the planning phase to end in fall 2025, with design and construction to follow.
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Thank you for attending our February drop-in sessions!
Last month, King County hosted two drop-in sessions in the SODO neighborhood. We spoke with community members at Home Depot and Macrina Bakery. Thank you to those who visited with our team and signed up for email updates! We look forward to continuing the conversation as this work progresses.
 King County staff spoke with over 100 community members in February.
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We are dedicated to listening to the community’s needs.
We want to make sure that everyone has access to information and can take part in ways that work best for you. You will have many options:
- Contact us to have a one-on-one conversation by phone, video chat, email, or in person.
- Visit kingcounty.gov/MDWetWeatherFacilitiesfor the latest updates.
- Invite us to a meeting hosted by your group or organization.
- Join remotely or in person at future meetings at project milestones. We will post on our website and email list once these are scheduled.
If you have suggestions for how we can best work with you, please let us know!
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Contact us:
Bibiana Ocheke-Ameh
Interpretation and translation services are available to you at no cost. If you need them please
contact Bibiana Ocheke-Ameh, Bibiana.Ocheke-Ameh@kingcounty.gov, (206) 477-5604
Los servicios de interpretación y traducción están disponibles para usted sin costo alguno. Si los necesita, comuníquese con Bibiana Ocheke-Ameh, Bibiana.Ocheke-Ameh@kingcounty.gov, (206) 477-5604
免費為您提供口譯和筆譯服務。如果您需要這些服 務，請聯絡 Bibiana Ocheke-Ameh, Bibiana.Ocheke-Ameh@kingcounty.gov, (206) 477-5604
免费为您提供口译和笔译服务。如果您需要这些服 务，请联络 Bibiana Ocheke-Ameh, Bibiana.Ocheke-Ameh@kingcounty.gov, (206) 477-5604
Dịch vụ thông dịch và biên dịch được cung cấp miễn phí cho quý vị. Nếu quý vị cần những dịch vụ này, xin vui lòng liên hệ với Bibiana Ocheke-Ameh, Bibiana.Ocheke-Ameh@kingcounty.gov, (206) 477-5604
Alternative Formats Available: 206-477-5371 or TTY Relay: 711
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Subscribe to The Bubbler
Sign up for The Bubbler newsletter to follow King County Wastewater Treatment Division’s latest news and updates on clean water investments. Get caught up by checking out the past issues, available on our website.
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