Henniker WWTF - Secondary Wastewater Treatment in Henniker, New Hampshire

Henniker WWTF is a municipal wastewater treatment facility located on Ramsdell Road in Henniker, New Hampshire, within Merrimack County. The plant serves a population of about 2,868 residents and operates under secondary treatment standards, which is the baseline requirement for most U.S. municipal plants under the Clean Water Act. With a designed capacity of 1,930.55 thousand gallons per day and an average discharge volume of 810.08 thousand gallons per day, the plant operates well within its capacity. As a secondary treatment facility, it uses biological processes to remove organic matter and suspended solids, meeting typical NPDES permit limits for biochemical oxygen demand and total suspended solids. The plant discharges treated effluent into the Contoocook River, a tributary of the Merrimack River, which flows into the Gulf of Maine. The Contoocook River supports diverse aquatic life and is an important recreational and ecological resource in central New Hampshire. The plant's discharge contributes to maintaining water quality in this river system.

The plant discharges into the Contoocook River, which flows into the Merrimack River and eventually reaches the Gulf of Maine. The Contoocook River watershed supports coldwater fisheries and provides habitat for species such as brook trout. Downstream, the Merrimack River is a major waterway that has been the focus of regional water quality improvement efforts, including nutrient management to prevent eutrophication in coastal estuaries.