Rollinsford WWTF - Secondary Wastewater Treatment Plant in Rollinsford, New Hampshire

Rollinsford WWTF is a municipal wastewater treatment facility located in Rollinsford, New Hampshire, serving a population of approximately 1,600 residents. The plant provides secondary treatment, which is the standard level required under the U.S. Clean Water Act for most municipal facilities to protect water quality. The plant discharges an average of 340.69 thousand gallons per day, with a designed capacity of 567.81 thousand gallons per day, indicating operational headroom for future growth or seasonal variations. As a facility in New Hampshire, it operates under the National Pollutant Discharge Elimination System (NPDES) permit program administered by the U.S. Environmental Protection Agency or the state's authorized agency. The plant's treated effluent is discharged into a local water body that ultimately drains to the Great Bay estuary and the Gulf of Maine. This coastal watershed is ecologically sensitive, supporting diverse aquatic life including migratory fish species. The plant's location within 50 kilometers of the coast places it in a region where nutrient management is important to prevent eutrophication in downstream estuarine environments.

The plant's discharge enters a tributary of the Salmon Falls River, which flows into the Great Bay estuary and then the Gulf of Maine. This watershed supports critical habitats for diadromous fish such as Atlantic salmon and river herring. Nutrient loading from wastewater can contribute to algal blooms in the estuary, making secondary treatment and proper discharge management essential for maintaining water quality and ecosystem health.