Somersworth WWTF - Municipal Wastewater Treatment in Somersworth, New Hampshire

Somersworth WWTF is a municipal wastewater treatment plant located in Somersworth, New Hampshire, serving a population of approximately 10,547. The plant is situated inland, about 50 km from the coast, and plays a key role in managing wastewater for this community in Strafford County. As a US facility serving a medium-sized agglomeration, the plant is subject to the Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting. Plants of this scale typically employ secondary treatment as a minimum, with potential for additional nutrient removal depending on local water quality requirements. The plant's treated effluent is discharged into local waterways that ultimately drain to the Atlantic Ocean via the Great Bay estuary and Piscataqua River. This watershed supports diverse aquatic life and is an important ecological corridor for migratory fish species.

The plant discharges into the Great Bay estuary watershed, which flows through the Piscataqua River to the Gulf of Maine and Atlantic Ocean. This estuarine environment is ecologically sensitive, supporting diverse aquatic life including shellfish, finfish, and migratory birds. Nutrient management is critical to prevent eutrophication in the estuary.