Machias WWTF - Secondary Wastewater Treatment Plant in Machias, Maine

Machias WWTF is a municipal wastewater treatment facility located in Machias, Washington County, Maine, United States. The plant serves a population of approximately 1,351 residents, reflecting a small coastal community in the northeastern United States. The facility provides secondary treatment, which is the standard level required under the U.S. Clean Water Act for municipal wastewater plants. With a design capacity of 2,119.82 volume units and an average daily discharge of 794.94 volume units, the plant operates well within its capacity. As a U.S. facility, it operates under a National Pollutant Discharge Elimination System (NPDES) permit issued by the Maine Department of Environmental Protection, ensuring compliance with federal water quality standards. The plant discharges treated effluent into a receiving water body that ultimately drains to the Gulf of Maine, part of the Atlantic Ocean. Its proximity to the coast (within 10 km) means the discharge can influence local estuarine and marine ecosystems. The Middle River, which flows through Machias, likely receives the treated water, supporting aquatic life and contributing to the health of the downstream coastal environment.

The treated effluent from Machias WWTF discharges into the Middle River, which flows into Machias Bay and then the Gulf of Maine. This coastal watershed supports diverse marine life, including fish, shellfish, and migratory birds. The plant's location near the coast means its nutrient and pollutant loads can affect local estuaries, which are critical nursery habitats for many species. Proper treatment helps protect water quality in this ecologically sensitive area.