Dexter Treatment Plant | Secondary Wastewater Facility in Dexter, Maine

The Dexter Treatment Plant is a municipal wastewater facility located in Dexter, Maine, a small town in Penobscot County. It serves a population of approximately 3,312 residents, making it a small-scale treatment operation within the state's wastewater infrastructure. The plant provides secondary treatment, a standard level required under the U.S. Clean Water Act for facilities of this size. With a designed capacity of about 1,060 cubic meters per day and an average daily discharge of 757 cubic meters, it operates well within its capacity. The plant is regulated under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. Treated effluent from the plant is discharged into a local receiving water body that flows into the Penobscot River watershed, eventually reaching the Atlantic Ocean. The plant plays a key role in protecting downstream aquatic habitats and maintaining water quality in the region's freshwater ecosystems.

The plant discharges into a local stream that is part of the Penobscot River basin, one of Maine's largest river systems. The Penobscot River flows south into Penobscot Bay and the Gulf of Maine, supporting diverse fish populations including Atlantic salmon and brook trout. The watershed is ecologically sensitive, with forested headwaters and coastal estuaries that provide critical habitat for migratory species.