Rathfriland Wastewater Treatment Plant, Newry, Northern Ireland

Rathfriland wastewater treatment plant is located on Drumlough Road near Newry, County Down, in Northern Ireland, United Kingdom. The facility serves a population of around 3,977 and is designed to handle a capacity of 4,000 m³ per day, with a current discharge volume of 885.42 m³/day. The plant provides secondary treatment, which is the standard level required under the EU Urban Waste Water Treatment Directive for agglomerations of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids before discharge. The treated effluent is discharged into local watercourses that ultimately drain into the Irish Sea. The plant plays a key role in protecting the freshwater ecosystems of County Down and the coastal waters of the Irish Sea from nutrient pollution and pathogens.

The plant discharges into local rivers that flow into the Irish Sea via Carlingford Lough or Dundrum Bay. These coastal waters support diverse marine life, including fish and shellfish, and are important for local fisheries and tourism. The secondary treatment helps reduce the risk of eutrophication and maintains water quality in the sensitive coastal environment.