Bar Harbor WWTF Main Facility
Bar Harbor, ME · Hancock County · Publicly Owned Treatment Works
- Average flow
- 0.82 MGD
- Design flow
- 2 MGD
- NPDES permit
- ME0101214
- Administratively continued
- Permit expires
- January 2021
- Population served
- 3,700
- CWNS 2022
Bar Harbor WWTF Main Facility is a publicly owned wastewater treatment works in Bar Harbor, Hancock County, Maine treating an average of 0.82 million gallons per day against a permitted design capacity of 2 MGD, serving about 3,700 residents. Treatment on site includes biogas balloons, biosolids mechanical dewatering, dechlorination, disinfection, chlorine/ chloramine, primary clarification or sedimentation and other unit processes. It discharges under NPDES permit ME0101214 (administratively continued), which expires in January 2021, with 9 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Biogas balloons
Unlock
Biosolids Mechanical Dewatering
unit processDechlorination
unit processDisinfection, chlorine/ chloramine
unit processPrimary Clarification or Sedimentation
unit processScreening
unit processSuspended Growth, Aerobic
unit processUnlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 9
- 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 Bar Harbor WWTF Main Facility.
No verified contacts on file yet
Klarifi verifies plant and municipal decision-makers continuously. Start a free trial to browse contacts at nearby plants and flag this one for verification.
Nearby wastewater treatment plants in Maine
Bar Harbor · 4 mi away
0.05 MGD
Bar Harbor · 5 mi away
0.0013 MGD
Winter Harbor · 6 mi away
0.02 MGD
Seal Harbor · 6 mi away
0.05 MGD
Mount Desert · 7 mi away
0.01 MGD
Northeast Harbor · 7 mi away
0.12 MGD
Blue Hill · 19 mi away
0.04 MGD
Milbridge · 19 mi away
0.01 MGD
Bar Harbor WWTF Main 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 November 26, 2025.