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

Colebrook WWTF is a municipal wastewater treatment facility located in Colebrook, New Hampshire, a town in the northern part of the state near the Connecticut River. The plant serves a population of about 1,215 residents, reflecting its role in a small rural community. The plant provides secondary treatment, which is the standard level required under the U.S. Clean Water Act for municipal wastewater. With a designed capacity of 1,703.43 million gallons per year and an actual discharge volume of 753.30 million gallons per year, the facility operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into a local water body that ultimately drains into the Connecticut River watershed. The Connecticut River flows southward through New England, emptying into Long Island Sound. This watershed supports diverse aquatic life and is an important ecological corridor in the region.

The plant's discharge enters a tributary of the Connecticut River, which flows through New Hampshire, Vermont, Massachusetts, and Connecticut before reaching Long Island Sound. The Connecticut River basin is ecologically significant, supporting migratory fish species such as Atlantic salmon and American shad, as well as diverse freshwater habitats. The plant's secondary treatment helps protect downstream water quality in this important watershed.