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This page hosts information for consultants and contractors interested in doing business with King County Wastewater Treatment Division (WTD).

King County WTD regional contractors and consultant opportunities – updated quarterly

Contact us

Stan Hummel
Capital Projects Supervisor


King County Wastewater Treatment Division will be represented at the Regional Contracting Forum in Tacoma. Come visit us!

Wed, September 21, 2022
8:00 AM – 4:00 PM PDT

Muckleshoot Casino Resort
2402 Auburn Way South
Auburn, WA 98002

Free Registration

About this Event

The Regional Contracting Forum is a network event hosted by Washington government associations to meet with businesses. This “reverse trade show” style-networking event is an opportunity for companies to meet with prime contractors and government organizations to ask questions and get information on how to do business with government.

Regional Contracting Forum attendees will have the opportunity to:

  • Network and meet government and regional contracting representatives in the areas of contracting, architecture and engineering and procurement
  • Get information on doing business with government
  • Get information regarding upcoming contracting opportunities
  • Ask questions and leave contact information for future conversations.
  • Receive information regarding mega projects in the regions
  • Sign up for one-on-one interviews with representatives from local government, state agencies, county jurisdictions and prime job contractors
  • Receive assistance and information from business resource organizations that will help grow their businesses

King County Networking Event for Primes and Subs

Wed, August 24, 2022
2:00 PM – 4:00 PM PDT

Tabor 100, Tukwila
7100 Fort Dent Way, Tukwila

Driving Directions

Register Now

About this Event

King County is partnering with Tabor 100 to offer a Prime/Subconsultant networking opportunity for small and diverse businesses. The Mouth of the Duwamish Program is expected to be one of the largest CSO control projects in King County's Wastewater Treatment Division (WTD) regional treatment and conveyance system. Several contracts are anticipated arise out of this program.

The first advertised contracts are anticipated to be:

  • Program Manager Owner Advisor, Q4, 2022
  • Engineering/ Environmental Services, Q1, 2023

These contracts will have several teaming opportunities and equity goals.

This networking event is intended for potential prime consultants and major engineering firms to meet with small, diverse business to explore teaming opportunities for MOD contracts, as well as other upcoming procurements for WTD.

We hope that you'll take advantage of this unique opportunity to get to know major engineering firms who do work with King County at the Tabor 100/ King County joint event!

If you haven't done so, sign up in E-procurement to receive contracting opportunities for King County that are specific to your industry code (NAICS code).

Informational Open House
Mouth of Duwamish (MOD) Program Consultant Opportunities

When: July 20, 2022 at 2:00 PM Pacific Time

Where: online meeting

View Presentation and registration list .

About this event

King County Wastewater Treatment Division (WTD) is preparing to solicit for consulting services for the Mouth of Duwamish (MOD) Program. MOD consists of combined sewer overflow (CSO) control projects to control five CSO outfalls at the mouth of the Duwamish River. The five outfalls to be controlled are Chelan, Hanford#2, Lander, King, and Kingdome CSOs. The project was previously referred to as CHLKK. The project is mandated under a consent decree under negotiation with the Department of Ecology, EPA and the Department of Justice. Negotiations will result in updates to the project schedules for the mandated projects including the MOD program.

WTD is intending to utilize collaborative delivery approaches including Progressive Design Build and General Contractor Construction Manager (GCCM) in addition to traditional delivery approaches. Initial procurements include a Program Manager/Owners Advisor contract and Engineering and Environmental for Alternatives Analysis, Project Siting Services, and Facility Plan Development. In order to encourage early teaming arrangements, the County is hosting a virtual open house to provide information about potential contracting opportunities.


  • Welcome Introductions
  • Background of this effort
  • Project Overview
  • Procurement Strategy/Requirements
  • BDCC-Equity in Contracting/Outreach
  • Q&A

Informational Open House
Alternative Delivery Opportunities
(Multiple Projects)

When: April 21, 2022 at 2:00 p.m. PDT

Where: online meeting

View Presentation .

We want to hear from you! Please tell us more about your firm via a brief survey: Contractor Survey

Questions? Contact Chad Merrill at

About this event

King County Wastewater Treatment Division (WTD) is intending to utilize Progressive Design Build (PDB) and General Contractor-Construction Manager (GCCM) alternative delivery procurement approaches on three upcoming projects. In order to encourage early teaming arrangements, the County is hosting a virtual informational open house for interested firms.

A brief description of the three projects we will be discussing at this open house are:

  • East Side Interceptor (ESI) Section 8 Rehabilitation: This project will rehabilitate 4,800 feet of the existing 90-inch diameter, 5,600-foot-long tunnel from the Energy Dissipating Structure, RO2-30, located at the intersection of I-90 and I-405, to structure RO2-29 located at the intersection of I-405 and Coal Creek Parkway SE; the 800 feet of this pipe upstream of RO2-30 was lined in 1996 and 1998 and does not require rehabilitation. The total project budget is $76,000,000. 
  • M Street Trunk Rehabilitation: This project is to rehabilitate approximately 13,900 linear feet of 18, 24, 30 and 36-inch diameter severely deteriorated reinforced concrete pipe and 45 precast concrete maintenance holes between MHs GR21-34A and R18H-78A comprising the northern portion of the M Street Trunk located within the City of Auburn, Washington. The project will require close coordination with the local jurisdictions for traffic control and associated sewer diversions that will impact public services. The total project budget is $36,000,000. 
  • West Point Treatment Plant Electrical Improvements: In 2019, WTD conducted a formulation project to define the scope and cost to upgrade and replace existing electrical equipment at the West Point Treatment Plant. The scope includes approximately 123 electrical assets that need to be replaced, and 9 assets that should be relocated to be above the flood zone. Additional areas to be evaluated in this scope of work are the direct current (DC) battery systems that provide critical power for switchgear and other controls, as well as low voltage (under 480V) panelboards, related transformers, and control systems. The total project budget is $130,000,000.

Finance and Business Operations - Dept. of Executive Services

Doing business with the county

The procurement and contract services section (PCSS) website is designed to assist users who do business with King County. The web site provides procurement and contract information for:

  • Construction 
  • A&E and professional services 
  • Technical services 
  • Goods and services