Bainbridge Island WWTP
1220 Donald Pl NE, Bainbridge Island, WA 98110 · Kitsap County · Publicly Owned Treatment Works
- Average flow
- 0.63 MGD
- 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 treating an average of 0.63 million gallons per day, serving about 2,730 residents. It discharges under NPDES permit WAG994558 (terminated), which expires in December 2026, with 1 recorded violation in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in February 2025.
Treatment technology
One treatment structure or unit process identified at Bainbridge Island WWTP.
Available with a free Klarifi account
See the full treatment train at Bainbridge Island WWTP: structures, unit processes and planned upgrades, with exact unit counts.
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.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Bainbridge Island WWTP in EPA's ICIS system.
- Formal actions
- 1
- 1 since FY2020
- Penalties assessed
- $675
- all cases
- Compliance actions
- $250
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Feb 2025
CITY OF BAINBRIDGE ISLAND WWTP - ESA (CWA NPDES)
Administrative order · CWA, NPDES Permit Violations · Final Order With Penalty · Penalty $675 · Compliance actions $250
EPA's description of the case:
“On November 12, 2024, Region 10 filed an expedited settlement agreement resolving CWA violations of the City of Bainbridge Island?s wastewater permit at its wastewater treatment plant in Bainbridge…”
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Source: EPA ECHO, civil enforcement case 10-2024-0214.
Full case history with a free Klarifi account
Every action against Bainbridge Island WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
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.
No verified contacts on file yet
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Seattle · 12 mi away
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Seattle · 14 mi away
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Renton · 17 mi away
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Edmonds · 17 mi away
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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 October 26, 2026; facility record last updated November 29, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms