Seal Harbor WWTF
State Route 3, Seal Harbor, ME 04675 · Hancock County · Publicly Owned Treatment Works
- Average flow
- 0.07 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 0.07 million gallons per day against a permitted design capacity of 0.25 MGD, serving about 1,010 residents. It discharges under NPDES permit ME0102555 (expired), which expires in April 2025, with 8 recorded violations in the last three years.
Treatment technology
6 treatment structures and unit processes identified at Seal Harbor WWTF.
Available with a free Klarifi account
See the full treatment train at Seal Harbor WWTF: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 8
- Effluent violations
- 2
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.
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Nearby wastewater treatment plants in Maine
Northeast Harbor · 3 mi away
0.2 MGD
Mount Desert · 6 mi away
0.02 MGD
Bar Harbor · 6 mi away
0.91 MGD
Bar Harbor · 8 mi away
0.05 MGD
Bar Harbor · 10 mi away
0.0035 MGD
Winter Harbor · 10 mi away
0.02 MGD
Sorrento · 13 mi away
0.0034 MGD
Ellsworth · 18 mi away
0.74 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 October 26, 2026; facility record last updated September 24, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · FOG · Equalization tank · all terms