Northfield Dept of Public Works Wastewater Treatment Plant, Massachusetts

The Northfield Dept of Public Works operates a municipal wastewater treatment plant in Northfield, Massachusetts, serving a population of approximately 1,870. The facility provides secondary treatment, a standard level for small communities in the United States, and has a designed capacity of 1,040.99 thousand gallons per day, with an average daily discharge of 832.79 thousand gallons per day. As a secondary treatment plant, it meets the minimum requirements under the U.S. Clean Water Act for municipal wastewater treatment. The plant is regulated under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. The plant's operation aligns with federal and state environmental standards. The treated effluent is discharged into a receiving water body within the Connecticut River basin, which ultimately drains into Long Island Sound. The Connecticut River is a major New England waterway supporting diverse aquatic life, including migratory fish species. The plant's discharge contributes to the overall water quality of the basin, and its secondary treatment helps reduce nutrient and pollutant loads to downstream ecosystems.

The plant discharges into a tributary of the Connecticut River, which flows south through Massachusetts and Connecticut before emptying into Long Island Sound. The Connecticut River watershed is ecologically significant, supporting species such as American shad, Atlantic salmon, and shortnose sturgeon. The plant's secondary treatment helps mitigate nutrient enrichment and protect downstream habitats in the river and estuary.