Castine Wastewater Treatment Facility
184 Court Street, Castine, ME 04421 · Hancock County · Publicly Owned Treatment Works
- Average flow
- 0.04 MGD
- Design flow
- 0.2 MGD
- NPDES permit
- ME0101192
- Administratively continued
- Permit expires
- August 2026
- Population served
- 1,320
- CWNS 2022
Castine Wastewater Treatment Facility is a publicly owned wastewater treatment works in Castine, Hancock County, Maine treating an average of 0.04 million gallons per day against a permitted design capacity of 0.2 MGD, serving about 1,320 residents. It discharges under NPDES permit ME0101192 (administratively continued), which expires in August 2026, with 6 recorded violations in the last three years.
Treatment technology
8 treatment structures and unit processes identified at Castine Wastewater Treatment Facility.
Available with a free Klarifi account
See the full treatment train at Castine Wastewater Treatment Facility: structures, unit processes and planned upgrades, with 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 Castine Wastewater Treatment Facility.
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Nearby wastewater treatment plants in Maine
Searsport · 7 mi away
0.06 MGD
Blue Hill · 10 mi away
0.05 MGD
Belfast · 11 mi away
0.59 MGD
Islesboro · 11 mi away
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Bucksport · 12 mi away
0.31 MGD
North Haven · 17 mi away
0.00072 MGD
Camden · 19 mi away
0.67 MGD
North Haven · 19 mi away
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Castine 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 October 26, 2026; facility record last updated January 29, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Filter press · FOG · all terms