Skip to main content
Most King County offices will be closed on Monday, for Memorial Day.  
King County logo


Natural Resources and Parks
Public Affairs

West Point Treatment Plant restoration update for Thursday, April 20, 2017


King County remains on schedule for restoring all wastewater treatment processes at the West Point Treatment Plant by April 30.


Workers continue to be on schedule for restoring wastewater treatment processes at the West Point Treatment Plant by April 30, where a Feb. 9 equipment failure has limited the King County facility’s wastewater treatment capabilities.

With all equipment either repaired or replaced that is critical to bringing West Point up to full wastewater treatment capability, much of the work that remains is centered on fine-tuning the biological processes that are essential to secondary treatment at the facility.

Wastewater treatment quality and capacity at West Point continues to improve. Up to 70 million gallons of the wastewater coming into the facility each day is now going through full secondary treatment.

As part of West Point’s restoration, King County will temporarily increase truck traffic from the plant to haul primary sludge and biosolids. Up to 16 solids trucks spread out over a 24-hour period could be expected until full solids treatment capacity returns to the plant’s digesters.

Progress report for Thursday, April 20:
King County employees and contractors are working on a variety of projects at West Point this week:

• Crews are completing tank cleaning over the next few days that could result is some nuisance odors that might be detectable in areas near treatment plant. The facility has a 24-hour odor control hotline - 206-263-3801.
• Work to restore healthy biology to the secondary and solids treatment systems continues to be the bulk of the remaining work. Crews have brought a fifth digester up to its operating temperature which will allow treatment of additional solids, and the plant should have access to that additional secondary treatment capacity within the next few days.
• Workers have been carefully feeding sludge captured in the primary treatment process to the microorganisms grown in the digesters that are at the core of the anaerobic digestion process to break down the organic solids that remain following the primary treatment process.

• Equipment repair and replacement projects continue, including electrical panel installations, which are being done as soon as new panels arrive at the plant.

• Only small areas of warm-water pipe insulation work remains, with crews wrapping the work in a matter of days.

Upcoming weather:
The likelihood of an emergency bypass decreases as drier spring weather coincides with progress in restoring West Point’s treatment capacity. Operators will continue to monitor weather conditions and flow data, and divert some flows headed to West Point to other facilities to avoid an emergency bypass. There have been no emergency bypasses since Feb. 16, and all beaches have been open since Feb. 21.

Keep up to date:
Stay informed about restoration work at the West Point Treatment plant. Visit the incident response page, and sign up for email updates, and follow on social media:

• Twitter:
• Facebook:
• Instagram:
• Blog: 
• Flickr:

# # #