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Upcoming contract opportunities
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
See also: Upcoming capital projects, Finance and Business Operations, Dept. of Executive Services
Invitation to bid
No invitations to bid at this time.
Request for proposal
Heavy Civil General Contractor/Construction Manager (GC/CM) Services for Mouth of Duwamish Combined Sewer Overflow (MDCSO) Chelan Wet Weather Storage
KING COUNTY’S E-PROCUREMENT SUPPLIER PORTAL
The official advertisement (RFP KC001590) for this project will be 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: https://kingcounty.gov/en/dept/executive-services/about-king-county/business-operations/finance-business-operations/procurement-payables/supplier-portal
Questions about the RFP? Contact Leeann Snyder, Contract Specialist, lsnyder@kingcounty.gov, 206-263-3517.
The Mouth of Duwamish Combined Sewer Overflow (MDCSO) Program involves the construction of new facilities to manage combined sewer overflow events, improve water quality, and meet regulatory requirements. This Heavy Civil GC/CM project includes preconstruction and construction for the MDCSO Chelan Wet Weather Storage. The Chelan Wet Weather Storage Project will serve combined sewer basins west of the Duwamish River. These basins receive both sanitary wastewater and stormwater. During rainfall events, flow in the combined sewer may exceed the sewer capacity, resulting in overflows to nearby waterbodies. The project includes construction of several new facilities including a 7-million gallon below grade combined sewer overflow (CSO) storage tank, a diversion structure, demolition and replacement of the Chelan regulator station, and installation of approximately 2,600 lineal feet of open-cut and trenchless (e.g., microtunneling and/or pipe ramming) influent 60-inch pipe.
Reference Material Files:
- Proposed Facilities Fact Sheet
- Chelan Wet Weather Storage Fact Sheet
- The Consent Decree in the case entitled United States of America and the State of Washington v. King County (USDC Civil Action No. 2:13-cv-677JCC lodged in the United States District Court, Western District of Washington on April 16, 2013)
- Amended agreement to 2013 Consent Decree
- First material modification to the Consent Decree
Prospective proposers can view more details at: https://kingcounty.gov/procurement/solicitations
Complete Solicitation Documents, including project details, specifications, and contact information are available on the Procurement and Payables web page at: https://kingcounty.gov/procurement/supplierportal
Progressive Design Build Services for South Interceptor Rehabilitation Project (KC001390)
As part of RFP Addendum 1, Progressive Design Build Services for South Interceptor Rehabilitation Project (KC001390), the following are being provided to the general public and as reference documents to the shortlisted firms. The listed reference documents are for general information only and shall not be relied upon for design development.
Reference Materials:
Flow Monitoring
- SINT001_20190901_20241125.csv
- SINTR18-03_DVQFINAL_20230518_20250303.csv
- SINTR18A-04_DVQFINAL_20230518_20250301.csv
- South-Interceptor-Portable-Flow-Monitoring-Locations.png
Video
- Q2_JunctionStructure_ESI1.RO1-01_20240925
- Q2_JunctionStructure_ESI1.RO1-01_20240925.jpg
- SOUTH INTERCEPTOR 8_2021-AMH 'RE_SINT.R18-01'-AMH 'RE_SINT.RO1-68'
- SOUTH INTERCEPTOR 8_2021-AMH 'RE_SINT.R18-02'-AMH 'RE_SINT.R18-01'
- SOUTH INTERCEPTOR 8_2021-AMH 'RE_SINT.R18-03'-AMH 'RE_SINT.R18-02'
- SOUTH INTERCEPTOR 8_2021-AMH 'RE_SINT.RO1-67'-AMH 'RE_ESI1.RO1-01'
- SOUTH INTERCEPTOR 8_2021-AMH 'RE_SINT.RO1-68'-AMH 'RE_SINT.RO1-67'
Complete Solicitation Documents, including project details, specifications, and contact information are available on the Procurement and Payables web page at: https://kingcounty.gov/procurement/supplierportal
Contact: Melissa Jordan, Contract Specialist, at mejordan@kingcounty.gov.
Request for information
No requests for information at this time.
Calendar
King County Contractor Outreach and Networking Event
Thank you for attending our third annual King County Contractor Outreach and Networking Event!
We had a fantastic turnout with over 800 attendees representing nearly 400 different businesses – our biggest event yet!
Additional information from the event can be found below:
- Updated Event Guide
- King County Capital Programs presentation slides
- Business Promotional Slides
- Visit our Procurement & Payable page to register with King County, sign up for an orientation, get certified, and more!
We value your feedback! Please fill out our feedback form so we can continue to add features and make improvements to future events.
Check out a short video from the event: LinkedIn Facebook Instagram
Contractor 1:1 Meetings
King County Wastewater Treatment Division (WTD) will be hosting opportunities for contractors and consultants to meet individually with WTD staff to discuss specific projects of interest. Below is a registration form to provide WTD with your firm’s date(s) of availability and project(s) of interest. We look forward to meeting your team!
When: January 22 to February 4, 2026
Where: Virtual meetings
Please register HERE.
Informational Open House: Upcoming Contracting Opportunities - King County Wastewater Treatment Division
King County Wastewater Treatment Division (WTD) is hosting a virtual Informational Open House for interested firms to learn about upcoming projects and events. To encourage early teaming arrangements, we hope interested firms attend.
Event Date/Time
January 15, 2026, at 10:00 AM (PST)
Recording
Open house materials
About the event
WTD will provide schedule updates on some of our collaborative delivery projects as well as a number of upcoming construction, consulting and work order contracts and highlight upcoming projects. A brief description of some of the projects presenting at this open house are below:
Brightwater Operations Center Roof & HVAC Replacement: This project will replace the roof and associated heating, ventilation, and air conditioning (HVAC) equipment on top of the Brightwater Treatment Plant Operations Center (BOC) (92,000SF). The project will also add a solar panel system and remove decommissioned equipment that is no longer operational.
South Plant Treatment & Electrical Improvements: Eight Projects all delivered under a single construction project. Undergoing evaluation for collaborative delivery.
Sammamish Plateau Diversion: This project will address regional conveyance system capacity needs by diverting flows out of the South Lake Sammamish Planning Area north. Diverting flows northward will alleviate capacity needs at several King County conveyance facilities.
South Plant DAFT Tank Rehabilitation: WTD will replace DAFTs 1 through 6 process equipment and covers at the STP. The DAFTs co-thicken primary sludge and waste activated sludge. Work includes performing demolition and replacement of the DAFT metal equipment components with new 316 Stainless Steel equipment, conversion of rail track system to cantilever system, new flat aluminum covers, ventilation system upgrades, access improvements, and pilot testing a sludge blanket level monitoring device. The equipment vendor package will include bridge beams, center column with internal motor, two rake arms, eight skimmer arms, two float boxes, and effluent Launder pipe.
Additionally, East Ship Canal Engineering RFP, Minor Asset Management Projects (MAMs) and Capital Asset Management Projects (CAMPs).
Contractor 1:1 Meetings
King County Wastewater Treatment Division (WTD) will be hosting opportunities for contractors and consultants to meet individually with WTD staff to discuss specific projects of interest. Below is a registration form to provide WTD with your firm’s date(s) of availability and project(s) of interest. We look forward to meeting your team!
When: September 18, 2025 to September 30, 2025
Where: Virtual meetings
Please register HERE.
Regional Contracting Forum
Location: Muckleshoot Casino Resort - 2402 Auburn Way South Auburn, WA 98002
Date: September 17, 2025
Time: 8:00am – 3:00pn
Registration link: 2025 Regional Contracting Forum Tickets, Wed, Sep 17, 2025 at 8:00 AM | Eventbrite
Introduce your business to prime contractors, prime consultants and the region's largest government entities: City of Seattle, King County, Washington State Department of Transportation, University of Washington, Port of Tacoma, Washington State Office of Minorities and Women's Business Enterprises, Washington State Department of Enterprise Services, Sound Transit, Port of Seattle, City of Bellevue, City of Tacoma, Department of Social and Health Services, Department of Corrections, and others. Attendees have the opportunity to meet government contracting representatives and network with contractors, consultants, and suppliers all at one event.
Informational Open House: Upcoming Contracting Opportunities - King County Wastewater Treatment Division
King County Wastewater Treatment Division (WTD) is hosting a virtual Informational Open House for interested firms to learn about upcoming projects and events. To encourage early teaming arrangements, we hope interested firms attend.
Event Date/Time
September 4, 2025, at 10 am (PST)
Recording
Open house materials
About the event
WTD will provide schedule updates on some of our collaborative delivery projects as well as a number of upcoming construction, consulting and work order contracts and highlight upcoming projects. A brief description of some of the projects presenting at this Open House are below:
Small Generators Replacement Group 1: This project provides engineering and related services to King County Department of Natural Resources and Parks, Wastewater Treatment Division (WTD) to identify and evaluate alternatives to replace small standby power generators and associated systems at 16 regulator or outfall stations. The 16 stations have been divided into three groups, this project is specifically for Group 1.
Brightwater Operations Center Roof & HVAC Replacement: This project will replace the roof and associated heating, ventilation, and air conditioning (HVAC) equipment on top of the Brightwater Treatment Plant Operations Center (BOC) (92,000SF). The project will also add a solar panel system and remove decommissioned equipment that is no longer operational.
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