COLERAIN WWTP - Powellsville, North Carolina Wastewater Treatment Plant

COLERAIN WWTP is a municipal wastewater treatment facility located in Powellsville, Bertie County, North Carolina. The plant serves a small population of 221 residents, reflecting its role in a rural community. It operates under the regulatory framework of the US Clean Water Act, which governs wastewater discharges through the National Pollutant Discharge Elimination System (NPDES) permit program. The plant provides secondary treatment, a standard level that removes biodegradable organic matter and suspended solids. With a designed capacity of 283.91 units and an average daily discharge of 79.49 units, the facility operates well below its capacity, indicating room for future growth. Secondary treatment typically involves biological processes such as activated sludge or trickling filters. The treated effluent is discharged into a local waterway, likely a tributary of the Chowan River or the Roanoke River, which ultimately flows into the Albemarle Sound and the Atlantic Ocean. The plant's location more than 10 km from the coast reduces direct marine impact, but its discharge contributes to the freshwater inflow into the Albemarle-Pamlico estuarine system, an ecologically important region supporting diverse aquatic life and migratory fish species.

The plant's discharge enters a local stream that drains into the Chowan River basin, which flows into the Albemarle Sound, a large estuarine system along the North Carolina coast. This watershed supports critical habitats for fish, shellfish, and waterfowl, including anadromous species like striped bass and American shad. The secondary treatment helps protect water quality in this sensitive coastal ecosystem by reducing organic pollutants and suspended solids before discharge.