Green roof at Sunset Pump Station

Making projects sustainable, resilient, and equitable

King County’s Wastewater Treatment Division (WTD) is being recognized for its commitment to sustainable communities and the environment. WTD’s Sunset / Heathfield Pump Stations and force main upgrade project was awarded an Envision® Silver Award this month for project sustainability. This is the second Envision-certified project for the region’s wastewater utility. In 2018, King County’s…

Aerial view of the West Point Treatment Plant

Charging ahead with reliable battery power for West Point Treatment Plant

The West Point Treatment Plant processes about 100 million gallons of wastewater each day, and up to 440 million gallons during heavy rains. While the plant’s operators are working hard to keep the treatment process flowing smoothly, a momentary lapse of power supply quality can bring vital equipment operations to a hard stop.   That’s why in February 2021, King County Executive Dow Constantine signed an emergency declaration and the King County Council authorized up to $65 million to provide West Point with more reliable power. The team…

Construction of a wastewater facility

Wastewater employees’ thoughtful approach earns industry award

Our employees plan, design, build, and operate treatment facilities to clean wastewater for the region. Planning and building new wastewater infrastructure is complex. It can easily take a decade or more to go from identifying a project is needed, to cutting the ribbon on a newly completed facility. Each project goes through several phases of…

Starting a decade of improvements at West Point Treatment Plant

Built in 1966, West Point Treatment Plant is the largest wastewater treatment plant by volume in Washington state, and the third largest by average daily flow on the West Coast. Like much of the King County wastewater system, it’s more than 55 years old and many of it’s components reach their “end of life” each…

workers planting trees

Planting trees is part of restoring construction sites

Restoring natural areas after construction is an important part of our work. When we work on improving or fixing the regional sewer system, sometimes impacts are unavoidable. When construction impacts sensitive areas and landscapes, our contractor restores the site before the project is complete. That’s what happened at Discovery Park in Seattle, and this spring…

Lake Sammamish

Working with Sammamish Plateau: No regional capacity limits and Diversion Project moving ahead

We clean wastewater for the region Pipes from homes and businesses in this area connect to local sewer systems. Then those local utility pipes connect to our bigger pipes, which carry wastewater to one of our regional treatment plants where we clean it. The local agencies own and operate their independent collection systems. The local…

Help us protect recovering landscapes

Some colorful new signs may catch your eye at former King County Wastewater Treatment Division (WTD) construction sites. WTD’s Mitigation and Monitoring (M/M) Program is installing new signs to alert people and help them protect recovering landscapes. WTD’s project teams strive to reduce impacts to people and the environment as they design critical infrastructure projects.…

Lake Hills/NW Lake Sammamish Sewer Upgrade Project – Join us for the latest details at Open houses on 10/22 and 10/24 in Redmond

There’s a lot of construction work planned for the Redmond area in the next few years. One of these projects is King County’s Lake Hills/NW Lake Sammamish Sewer Upgrade. King County needs to upgrade a regional sewer pipe that is undersized and aging. This 4.5-mile-long sewer pipe is located underground in trails, roads, parks, and…

King County’s Georgetown Wet Weather Treatment Station celebrates Platinum Achievement Award for Sustainability

King County’s Georgetown Wet Weather Treatment Station (WWTS) has earned the coveted “Platinum” rating from the Institute for Sustainable Infrastructure’s Envision rating system. This is the first Platinum-awarded Envision project in Washington and recognizes the County’s commitment to sustainable communities and the environment. The Georgetown WWTS project is under construction in Seattle’s Georgetown neighborhood and…

Sedimentation tanks

Finding hidden value at the bottom of a sedimentation tank

What’s the real cost? Have you ever been undecided when buying an appliance, trying to choose between a standard or select model? You probably wished you had some data to help you make an informed choice. Well, by studying costs and crunching the numbers, maintenance engineers at West Point determined that what looked like a…