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City of Seattle·Washington

Phased CSO Program Management, Construction Management, & Owner’s Advisor

Closes 4/21/2026$50M – $100MRequest for Proposal
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Description

The City of Seattle is seeking a consultant to provide comprehensive management and technical support for the Combined Sewer Overflow (CSO) Program. The selected team will assist the City in delivering a multi-year capital program that includes program management, options analysis, construction management, Owner’s Advisor services, and related technical and strategic support. The program aims to reduce combined sewer overflows and bring the system into regulatory compliance. The consultant will provide services such as program management, options analysis, engineering reports, community outreach, permitting, and regulatory compliance. The contract is expected to be valued between $50 million and $100 million and will be awarded for a period of approximately 13 years. • Key services include program management, options analysis, engineering reports, community outreach, permitting, and regulatory compliance • The program aims to reduce combined sewer overflows and bring the system into regulatory compliance • The contract is expected to be valued between $50 million and $100 million • The contract will be awarded for a period of approximately 13 years • The City is seeking a consultant with experience in delivering large, multi-phase utility or wastewater programs

Attached files

The solicitation documents live at the source — open the bid source above to download them.

Contact

Sherry Shaffer(SPU Contracts & Procurement Advisor)

[email protected]

(206) 684-7642

Key dates

Opened
3/17/2026
Questions due
4/3/2026
Pre-bid meeting
3/25/2026
Closes
4/21/2026
Projected award
6/8/2026
Duration
13 years

Last updated

Details

Type
Request for Proposal
Industry
Engineering Services
NAICS
541330
Solicitation №
25-232-S

Budget estimate

$50,000,000 – $100,000,000

The contract is expected to be valued between $50 million and $100 million. The budget amount will depend on the scope of work, the consultant's expertise, and the City's budget. Factors that may influence the likely payment range include the complexity of the project, the number of phases, and the level of expertise required.

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