Manchester WWTP
8020 E Caraway Rd, Port Orchard, WA 98366 · Kitsap County · Publicly Owned Treatment Works
- Average flow
- 0.22 MGD
- Design flow
- 0.92 MGD
- NPDES permit
- WA0023701
- Administratively continued
- Permit expires
- February 2023
- Population served
- 2,644
- CWNS 2022
Manchester WWTP is a publicly owned wastewater treatment works in Port Orchard, Kitsap County, Washington treating an average of 0.22 million gallons per day against a permitted design capacity of 0.92 MGD, serving about 2,644 residents. It discharges under NPDES permit WA0023701 (administratively continued), which expires in February 2023, with 0 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Manchester WWTP.
Available with a free Klarifi account
See the full treatment train at Manchester WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Manchester WWTP.
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Nearby wastewater treatment plants in Washington
Port Orchard · 3 mi away
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Bainbridge Island · 5 mi away
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Seattle · 9 mi away
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Seattle · 12 mi away
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Renton · 16 mi away
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Kingston · 16 mi away
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Federal Way · 18 mi away
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Manchester 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 · Lift station · Sludge dewatering · all terms