Oxidation ditches: wastewater treatment plants in Maine
6 plants · 7% of the state · 1 MGD reported by 5 plants
Klarifi identifies 6 publicly owned wastewater treatment plants with oxidation ditches in Maine, 7% of the 84 plants in the state (1 MGD reported by 5 plants). The largest is Yarmouth Wastewater Treatiment Facility in Yarmouth at 0.44 MGD.
Oxidation ditches are ring-shaped activated sludge reactors with long retention times, common at plants between 0.5 and 10 MGD. They are recognisable from the air by their looped channels and rely on surface aerators or brush rotors, which are frequent replacement and energy-efficiency projects.
The largest oxidation ditch plants in Maine
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Yarmouth Wastewater Treatiment Facility | Yarmouth | 0.44 | ME0100765 | Aug 2022 | 3 |
| 2 | Newport Wastewater Treatement Facility | Newport | 0.14 | ME0100447 | Mar 2028 | 2 |
| 3 | South Cape Elizabeth WWTF | Cape Elizabeth | 0.14 | ME0102121 | Dec 2021 | 15 |
| 4 | Richmond Wastewater Treatment Facility | Richmond | 0.09 | ME0100587 | May 2030 | 8 |
| 5 | Wastewater Treatment Facility Hulls Cove | Bar Harbor | 0.05 | ME0102466 | Mar 2030 | 5 |
| 6 | Sanford Wastewater Treatment Facility | Sanford | — | ME0100617 | Jul 2023 | 4 |
Contacts and project signals for every plant on this list
Klarifi adds verified decision-maker contacts, permit limits, discharge monitoring data and the capital projects planned in each city, filterable by technology, size and compliance record.
Other technologies in Maine
Oxidation ditches in other states
Oxidation ditches in Maine: 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.