Request for Services for West Point Treatment Plant

King County’s new E-Procurement Supplier Portal is now live! Register today to for a chance to support the upcoming West Point Treatment Plant project.


PURPOSE: King County Wastewater Treatment Division (WTD) held an Open House on 1/31/23, requesting industry comments on its upcoming GC/CM Services for WPTP Project, located in Seattle, WA. King County anticipates utilizing the General Contractor/Construction Manager (GCCM) delivery method and is seeking Project Review Committee Approval on 3/23/2023.

King County is providing prospective Proposers an opportunity to provide feedback, particularly on the items within the formal Request for Information (RFI) questionnaire. Responses to the RFI will assist in formulation of the PRC application.

PROJECT BACKGROUND: The West Point Treatment Plant (WPTP) provides secondary treatment for approximately 700,000 residents and businesses in Seattle and northern King County. With many mechanical, electrical, and support systems at the WPTP reaching the end of useful life, King County will invest more than $800 million over the next 10 years to upgrade the WPTP. This project will deliver a portion of that work, including mechanical, electrical, and seismic upgrades and will coordinate with other active construction contracts at the Plant.  Constraints includes performing work on an operating wastewater treatment facility which requires carefully planned and executed outages, close coordination with Operations and Maintenance staff, and sequencing of projects to minimize Plant disruption.  In addition, space is limited for contractor staging and parking which may require off-site lay down and parking.

MACC ESTIMATE: $150,000,000 – $200,000,000


The official advertisement for this RFI has been published through King County’s E-Procurement system. To receive future notifications, please be sure your firm is registered in King County’s E-Procurement Supplier Portal. For registration information, please visit:

Click here to register.