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Kitsap County presents solids project for Central Kitsap Treatment Plant; Poulsbo share estimated at about $20 million
Summary
Kitsap County staff briefed the Poulsbo council on a multi-phase solids-handling upgrade at the Central Kitsap Treatment Plant that would replace aging digesters; a 60% cost estimate is $163 million and Poulsbo—s estimated share is about $20.1 million under current allocations.
Kitsap County officials outlined a multi-phase solids-handling upgrade at the Central Kitsap Treatment Plant and discussed how the project would affect partner jurisdictions including Poulsbo.
Project overview: County staff said the project will replace end-of-life digesters, convert to rotary-drum thickening, and construct process and maintenance facilities. The selected delivery method is GCCM (general contractor/construction manager) to allow contractor input during design and to set a Maximum Allowable Construction Cost (MAC) once design is advanced.
Cost and Poulsbo share: At the county—s 60% design estimate, the solids project cost came in at approximately $163 million. County staff said Poulsbo—s share of that estimate is roughly $20 million (the county cited a little over $20M), and noted the project will be delivered in phases with the initial phase focused on digesters and thickening equipment. Staff said earlier grant pursuit efforts included DCIP and other federal funding applications; the county reported mixed success and continuing grant-seeking effort.
Why it matters: Poulsbo purchases conveyance and treatment capacity in the regional system and is allocated a share of upgrades. City staff told the council that Poulsbo owns a percentage of plant capacity and must budget for its share of major upgrades; the city told the county it wanted clarity on what it will be paying for and to ensure costs are correctly allocated only to city-used facilities (no county septage/FOG costs should be assigned to Poulsbo where not appropriate).
Other county projects: County staff also described other sewer and conveyance work affecting Poulsbo service areas, including Johnson & Norum pipeline replacement, Pump Station 24 electrical/equipment upgrades and siphon evaluations.
Next steps and timing: County staff said design is expected to finish later in 2025 with contractor MAC pricing and phased construction to follow; they emphasized continuing grant-seeking and low-interest loan programs to reduce rate impacts. County and city staff will coordinate on connection fees, rate impacts and schedule.
