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West Point Treatment Plant restoration update for Thursday, March 23, 2017


Steady progress continues to be made toward restoring full wastewater treatment capabilities by the end of April at the King County West Point Treatment Plant.


Crews working seven days a week remain on track for restoring full wastewater treatment function at the West Point Treatment Plant by April 30 following an equipment failure in February that reduced the facility’s wastewater treatment capabilities.

Wastewater treatment reached a milestone this week bringing on line partial but fully functional primary treatment systems in addition to screening and disinfection. No emergency bypasses of highly diluted stormwater and wastewater into Puget Sound have occurred since Feb. 16 at the plant, and all beaches have been open since Feb. 21.

Progress report for March 23:
More than 100 contractors and King County employees are working on a variety of wastewater treatment restoration projects at West Point today, March 23:

• Wastewater treatment experts are planning to reseed West Point’s secondary treatment process with a rich soup of microorganisms from the South Treatment Plant starting within the next few days. Read more about the biological restoration in this March 8 Wastewater Treatment Division blog post.

• Crews have completed removing all of the contaminated insulation from the pipes that carry and circulate hot water to the digester system, and continue to install new insulation along the hot water pipe network.

• The solids handling systems have also been restored so that sludge generated from the primary treatment process can be collected and put into the anaerobic digesters. Digester health results have been positive and West Point is expected to resume production of LOOP biosolids by the end of Friday, March 24. This nutrient-rich soil amendment is used in gardens, on farms, and in forests.

• Additional work at the plant includes electrical panel replacement.

Upcoming weather:
Rainfall in Seattle totaling one inch or more over two or three consecutive days could lead to an emergency bypass at the West Point plant of wastewater highly diluted by stormwater.

During heavy rainstorms when the volume of stormwater and wastewater flowing into the plant appears to approach the upper limit of its current treatment capacity, plant operators can avoid an emergency bypass by diverting some of the flow headed toward West Point to other wastewater treatment facilities.

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:

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