Amherst Dept of Public Works Wastewater Treatment Plant, Hadley, Massachusetts

The Amherst Dept of Public Works wastewater treatment plant is located in Hadley, Massachusetts, within the Connecticut River watershed. It serves a population of around 30,783 people, placing it in the medium-agglomeration category for US municipal wastewater systems. As a US facility, the plant operates under the Clean Water Act, with National Pollutant Discharge Elimination System (NPDES) permits issued by the Massachusetts Department of Environmental Protection. For a population of this scale, secondary treatment is typically required, with additional nutrient removal standards applicable in sensitive watersheds like the Connecticut River basin. The plant discharges treated effluent into the Connecticut River, which flows south through Massachusetts and Connecticut before emptying into Long Island Sound. This water body supports diverse aquatic life and is an important migratory corridor for fish species. The plant's operations contribute to maintaining water quality in this major New England river system.

The plant discharges into the Connecticut River, a major New England waterway that flows approximately 410 miles from northern New Hampshire to Long Island Sound. The river supports diverse aquatic ecosystems, including migratory fish such as Atlantic salmon and American shad. Downstream, the Connecticut River estuary and Long Island Sound are ecologically sensitive areas that benefit from effective wastewater treatment to control nutrient loading and protect marine habitats.