Peaks Island STP
1 Island Ave, Portland, ME 04108 · Cumberland County · Publicly Owned Treatment Works
- Average flow
- 0.08 MGD
- Design flow
- 0.2 MGD
- NPDES permit
- ME0102237
- Administratively continued
- Permit expires
- October 2022
- Population served
- 500
- CWNS 2022
Peaks Island STP is a publicly owned wastewater treatment works in Portland, Cumberland County, Maine treating an average of 0.08 million gallons per day against a permitted design capacity of 0.2 MGD, serving about 500 residents. It discharges under NPDES permit ME0102237 (administratively continued), which expires in October 2022, with 37 recorded violations in the last three years.
Treatment technology
Treatment structures and unit processes at Peaks Island STP.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 37
- Effluent violations
- 37
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Peaks Island STP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Maine
Falmouth · 5 mi away
0.89 MGD
Cape Elizabeth · 5 mi away
0.22 MGD
Westbrook · 8 mi away
3.05 MGD
Yarmouth · 8 mi away
0.0078 MGD
Yarmouth · 10 mi away
0.55 MGD
Freeport · 13 mi away
0.3 MGD
Old Orchard Beach · 15 mi away
0.99 MGD
Biddeford · 16 mi away
0.0075 MGD
Peaks Island STP: 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