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Wastewater Treatment Plant Capacity Upgrades
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March 2026: The contractor is moving storage equipment on site in preparation to start work in June.
Project overview
The City's Wastewater Treatment Plant Capacity Upgrade project will provide increased organic loading capacity and equipment replacement. It is expected that the biochemical oxygen demand (BOD) loading at the Plant will exceed the current maximum-month load and capacity rating of 2,642 pounds per day in the next three to five years. The upgrades to the secondary treatment process will increase the permit limits influent maximum-month BOD and total suspended solids loading to 3,200 ppd.
The City will be replacing the ultraviolet (UV) disinfection system and miscellaneous equipment (secondary clarifier tank drain pumps) that are nearing the end of their service life. The UV inactivates microorganisms and reduces fecal coliform counts in the effluent prior to discharge to the Puget Sound. The existing UV system was installed in 2005 and the system’s Programmable Logic Controller (PLC) has a high risk of failure. The City has already experienced challenges in replacing obsolete PLC components.
The project will increase organic load capacity and replace critical equipment nearing its end of service life.
July 2025: Working through the equipment submittals and procurement with an estimated start of June, 2026.
April 22, 2025: City Council awarded the construction contract for this project to McClure & Sons, Inc.
September 2024: Complete plans and specifications have been submitted to the Washington State Department of Ecology (WADOE) for review. The City plans to submit an application for funding through the Department of Ecology in October.
January 23rd, 2024: City Council authorized the advertisement for bids for the Wastewater Treatment Plant Capacity Upgrade equipment.
The City worked with Tetra Tech for design of the wastewater treatment plant upgrades and submitted three technical memos to the Department of Ecology to review and approve.
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The City of Bainbridge Island, in accordance with Title VI of the Civil Rights Act of 1964 (78 Stat. 252, 42 U.S.C. 2000d to 2000d-4) and the Regulations, hereby notifies all bidders that it will affirmatively ensure that in any contract entered into pursuant to this advertisement, disadvantaged business enterprises will be afforded full and fair opportunity to submit bids in response to this invitation and will not be discriminated against on the grounds of race, color, or national origin in consideration for an award.
Those requiring disability accommodations and/or materials made available in alternate formats, please contact the City Clerk at 206.842.2545 or cityclerk@bainbridgewa.gov.