Seal Harbor WWTF
Seal Harbor, ME · Hancock County · Publicly Owned Treatment Works
- Average flow
- 0.05 MGD
- Design flow
- 0.25 MGD
- NPDES permit
- ME0102555
- Expired
- Permit expires
- April 2025
- Population served
- 1,010
- CWNS 2022
Seal Harbor WWTF is a publicly owned wastewater treatment works in Seal Harbor, Hancock County, Maine treating an average of 0.05 million gallons per day against a permitted design capacity of 0.25 MGD, serving about 1,010 residents. Treatment on site includes dechlorination, disinfection, uv, disinfection, chlorine/ chloramine, flotation, screening and other unit processes. It discharges under NPDES permit ME0102555 (expired), which expires in April 2025, with 6 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Dechlorination
unit processDisinfection, UV
unit processDisinfection, chlorine/ chloramine
unit processFlotation
unit processScreening
unit processSuspended Growth, Aerobic
unit processUnlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 6
- 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 Seal Harbor WWTF.
No verified contacts on file yet
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Nearby wastewater treatment plants in Maine
Northeast Harbor · 3 mi away
0.12 MGD
Mount Desert · 6 mi away
0.01 MGD
Bar Harbor · 6 mi away
0.82 MGD
Bar Harbor · 8 mi away
0.05 MGD
Bar Harbor · 10 mi away
0.0013 MGD
Winter Harbor · 10 mi away
0.02 MGD
Blue Hill · 19 mi away
0.04 MGD
Milbridge · 24 mi away
0.01 MGD
Seal Harbor WWTF: 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.