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 Work is underway on the Effluent Pump Station Gate Rehabilitation project at West Point Treatment Plant.
We’re in the second construction season of our Effluent Pump Station Gate Rehabilitation project at West Point Treatment Plant in Seattle!
Last year, crews replaced one of four large gates — each about 8 feet by 8 feet and nearly 40 feet underground. This year, they’re replacing the remaining three. These gates allow us to take individual pumps offline for maintenance without shutting down the entire system that sends fully treated wastewater safely to Puget Sound. That means safer, easier maintenance and a more reliable system.
Construction doesn’t mean we stop cleaning wastewater. Crews work at night when wastewater flows are lowest. They install cofferdams (pictured) to keep the work area dry while a temporary bypass pipe keeps everything flowing safely.
This is one of the many upgrades underway during the dry months that ensure a reliable system and help protect public health and the environment every day!
 Click the image above to watch the video.
This summer, we’re introducing Loop Compost, a new locally produced compost made from materials recovered during the wastewater treatment process. Currently produced through a pilot-scale operation at our South Treatment Plant in Renton, Loop Compost builds on our nearly 50-year commitment to turning wastewater byproducts into beneficial resources through Washington’s oldest biosolids program.
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 Archival photo of West Point Treatment Plant.
This year, we’re marking 60 years of operations at West Point Treatment Plant in Seattle! Today, we work 24/7 to clean more than 90 million gallons of wastewater every day, protecting public health and Puget Sound. West Point came online in 1966, following South Treatment Plant in Renton, which celebrated its 60th birthday last year. Brightwater Treatment Plant near Woodinville turns 15.
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 The new flap gates in South Park are designed to protect homes and businesses by preventing river water from flowing back into our sewer system.
Crews installed stainless steel sewer flap gates inside our 8th Avenue South Regulator Station, located along the Duwamish Waterway in South Park.
During high tides and storms, river water backflow can contribute to sewer backups in nearby homes and businesses. The new flap gates prevent river water from flowing back into our sewer system, helping protect the community as sea level rise and other climate change impacts increase the risk of sewer backups.
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 WTD's Community Services team speak with members of the public at Renton River Days.
It’s been a busy summer for our Community Services team, attending events around the region to share information and answer questions about our work! From Renton River Days to the Annual Indian Days Powwow to White Center Gather for Goals, we’ve chatted with more than 3,000 people face-to-face in recent months.
We've enjoyed highlighting ongoing projects to improve our regional sewer system and informing community members about our work to promote clean water. We'll be at the Duwamish River Community Coalition's annual Duwamish River Festival this weekend. See you there!
 Aerial image of the Duwamish Waterway in Seattle.
We are developing an Americans with Disabilities Act (ADA) Transition Plan to improve access to our programs, services, and spaces. We want to hear from you about how to make them inclusive for everyone!
The survey is open until Sunday, Sept. 13, 2026.
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 We celebrated the work of a handful of WTD’s remarkable women engineers.
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 Local sensation Jimothy becomes an advocate for safe flushing and clean water.
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 A grant opportunity to support King County RainWise.
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