Ballyclare Wastewater Treatment Plant, County Antrim, Northern Ireland

Ballyclare wastewater treatment plant is located in Rushfield, Ballyclare, within the Antrim and Newtownabbey District of County Antrim, Northern Ireland. The plant serves a population of around 16,500, classifying it as a medium-sized agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). As a UK facility, the plant operates under the Water (Northern Ireland) Order 1999 and is subject to the EU UWWTD, which requires secondary treatment for discharges to freshwater and estuaries for agglomerations of this size. The plant discharges treated effluent into local watercourses that drain into the Six Mile Water river, a tributary of Lough Neagh. Lough Neagh is the largest freshwater lake in the British Isles and supports diverse aquatic life, including important fish populations and migratory birds. The broader catchment ultimately drains to the Atlantic Ocean via the Bann River.

The plant's treated effluent enters the Six Mile Water river, which flows into Lough Neagh, the largest lake in the British Isles. Lough Neagh is ecologically significant, supporting a rich ecosystem of fish, invertebrates, and waterfowl. The lake's outflow via the Lower Bann River reaches the Atlantic Ocean at Portstewart. The watershed is sensitive to nutrient inputs, and the plant's compliance with EU standards helps protect this important freshwater resource.