Hillsborough WWTF - Municipal Wastewater Treatment in Hillsborough, New Hampshire

Hillsborough WWTF is a municipal wastewater treatment facility located in Hillsborough, New Hampshire, serving a population of about 3,200. The plant is situated inland, away from coastal areas, and discharges into local waterways that ultimately drain into the Merrimack River basin. As a US-based facility, Hillsborough WWTF operates under the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the New Hampshire Department of Environmental Services. The Clean Water Act requires secondary treatment for municipal plants, which typically involves biological processes to reduce organic matter and suspended solids. Plants of this size generally employ conventional activated sludge or similar technologies. The treated effluent from Hillsborough WWTF is discharged into a receiving water body within the Merrimack River watershed. The Merrimack River flows southward through New Hampshire and Massachusetts before emptying into the Atlantic Ocean. This river system supports diverse aquatic life and provides drinking water for downstream communities. The plant's operation is critical for maintaining water quality in the watershed and protecting the ecological health of the Merrimack River.

Hillsborough WWTF discharges into a tributary of the Contoocook River, which flows into the Merrimack River. The Merrimack River is a major waterway in New England, draining into the Atlantic Ocean at Newburyport, Massachusetts. The watershed supports diverse fish populations, including migratory species like Atlantic salmon and American shad, and provides habitat for freshwater mussels and other aquatic organisms. The plant's effluent must meet state and federal water quality standards to protect these ecological resources.