Hooksett WWTF | Wastewater Treatment Plant in Hooksett, New Hampshire

Hooksett WWTF is a municipal wastewater treatment facility located in Hooksett, New Hampshire, United States. It serves a population of about 8,378 people, placing it in the small-to-medium agglomeration category under US regulatory frameworks. As a US facility, Hooksett WWTF operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the New Hampshire Department of Environmental Services. For plants serving populations of this scale, secondary treatment is typically required, with additional nutrient removal standards applicable in sensitive watersheds. The plant discharges treated effluent into the Merrimack River, a major waterway in New England that flows southward through New Hampshire and Massachusetts before emptying into the Gulf of Maine. The Merrimack River supports diverse aquatic life and provides drinking water for downstream communities, making effective wastewater treatment critical for regional water quality.

The treated effluent from Hooksett WWTF enters the Merrimack River, which flows approximately 117 miles to the Atlantic Ocean via the Gulf of Maine. The river supports a variety of fish species, including migratory fish like Atlantic salmon and river herring, and provides habitat for freshwater mussels. The watershed is ecologically sensitive due to its role in sustaining both aquatic biodiversity and regional water supplies.