Dark Harbor Wastewater Treatment Facility
524 Pendleton Point Road, Islesboro, ME 04848 · Waldo County · Publicly Owned Treatment Works
- Average flow
- 0.02 MGD
- Design flow
- 0.06 MGD
- NPDES permit
- ME0100269
- Effective
- Permit expires
- August 2030
- Population served
- 73
- CWNS 2022
Dark Harbor Wastewater Treatment Facility is a publicly owned wastewater treatment works in Islesboro, Waldo County, Maine treating an average of 0.02 million gallons per day against a permitted design capacity of 0.06 MGD, serving about 73 residents. It discharges under NPDES permit ME0100269 (effective), which expires in August 2030, with 3 recorded violations in the last three years.
Treatment technology
Treatment structures and unit processes at Dark Harbor Wastewater Treatment Facility.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 3
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Dark Harbor Wastewater Treatment Facility.
No verified contacts on file yet
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North Haven · 8 mi away
0.00072 MGD
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North Haven · 9 mi away
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Castine · 11 mi away
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Belfast · 12 mi away
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Searsport · 14 mi away
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Rockland · 14 mi away
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Vinalhaven · 15 mi away
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Dark Harbor Wastewater Treatment Facility: 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 September 24, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Activated sludge · Oxidation ditch · all terms