Belfast S T P Wastewater Treatment Plant, Belfast, Maine

Belfast S T P is a municipal wastewater treatment plant located in Belfast, Maine, United States. Serving a population of approximately 4,739, the plant is situated on Front Street in Waldo County, near the coast of Penobscot Bay. As a facility in a small coastal community, it plays a key role in protecting local water quality and public health. The plant's designed capacity is 1.00 million gallons per day, reflecting the scale of the community it serves. Under the U.S. Clean Water Act, municipal treatment plants of this size are typically required to meet secondary treatment standards through National Pollutant Discharge Elimination System (NPDES) permits issued by the Maine Department of Environmental Protection. These permits set effluent limits to protect receiving waters. The plant's treated effluent is discharged into the Penobscot Bay watershed, which ultimately drains into the Gulf of Maine. The bay supports diverse marine life, including fish, shellfish, and seabirds, and is an important ecological and economic resource for the region. Proper treatment helps maintain water quality for recreation and habitat.

Belfast S T P discharges into the Penobscot Bay watershed, which flows into the Gulf of Maine. This coastal ecosystem supports a variety of marine species, including lobsters, clams, and migratory fish such as Atlantic salmon. The bay is ecologically sensitive, and nutrient loading from wastewater can affect water quality and marine habitats. The plant's treatment processes help mitigate these impacts.