Dark Harbor Wastewater Treatment Facility
Islesboro, ME · Waldo County · Publicly Owned Treatment Works
- Average flow
- 0.0024 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 0.0024 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 identified at this facility. Exact unit counts are available in Klarifi.
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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Nearby wastewater treatment plants in Maine
Camden · 9 mi away
0.32 MGD
North Haven · 9 mi away
0.0046 MGD
Castine · 11 mi away
0.03 MGD
Belfast · 12 mi away
0.42 MGD
Searsport · 14 mi away
0.05 MGD
Vinalhaven · 15 mi away
0.02 MGD
Thomaston · 18 mi away
0.003 MGD
Blue Hill · 19 mi away
0.04 MGD
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 September 11, 2026; facility record last updated September 24, 2025.