Saint-Brandan Le Grenieux Wastewater Treatment Plant, Brittany, France

The Saint-Brandan Le Grenieux wastewater treatment plant is located in the commune of Saint-Brandan, in the Côtes-d'Armor department of Brittany, France. This facility serves a population of approximately 3,500 residents and is part of the region's municipal wastewater infrastructure. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 6,785 m³/day and a current discharge volume of 630.10 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local watercourses that ultimately drain into the English Channel. The plant plays a key role in protecting the sensitive aquatic ecosystems of Brittany, a region known for its rich biodiversity and coastal waters. Advanced treatment helps minimize nutrient pollution and supports the ecological health of downstream rivers and marine environments.

The plant discharges into the local watershed that flows through the Brittany region and eventually reaches the English Channel. This coastal zone supports diverse marine life and is important for fisheries and tourism. Advanced treatment reduces nutrient loads, helping to prevent eutrophication in downstream estuaries and coastal waters.