Bainbridge Island WWTP
Bainbridge Island, WA · Kitsap County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- WAG994558
- Terminated
- Permit expires
- December 2026
- Population served
- 2,730
- CWNS 2022
Bainbridge Island WWTP is a publicly owned wastewater treatment works in Bainbridge Island, Kitsap County, Washington, serving about 2,730 residents. Treatment on site includes clarifiers. It discharges under NPDES permit WAG994558 (terminated), which expires in December 2026, with 1 recorded violation in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Bainbridge Island
Bainbridge Island's capital improvement plan lists 24 water, sewer and wastewater line items worth $31M starting 2025–2029. The largest budgeted items are shown here.
All water and sewer capital projects in Bainbridge Island →
| Project | Budget | Years |
|---|---|---|
| Winslow Water Tank Replacement | $11,000,000 | 2025–2026 |
| Pump Station & Force Main | $3,184,000 | 2025–2025 |
| WWTP Clarifier/Drain Pump/Fine Screen | $2,850,000 | 2027–2028 |
| Relocate Pump Station | $1,800,000 | 2027–2027 |
| Winslow Supply Well | $1,500,000 | 2027–2027 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
Decision-makers at Bainbridge Island WWTP.
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Nearby wastewater treatment plants in Washington
Seattle · 4 mi away
—
Port Orchard · 5 mi away
—
Suquamish · 7 mi away
0.16 MGD
Port Orchard · 8 mi away
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Kingston · 11 mi away
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Seattle · 12 mi away
—
Renton · 17 mi away
—
University Place · 30 mi away
17.07 MGD
Bainbridge Island WWTP: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated November 29, 2025.