Saint Brice en Cogles Wastewater Treatment Plant, Maen-Roch, Bretagne

The Saint Brice en Cogles wastewater treatment plant is located in Maen-Roch, in the Bretagne region of northwestern France. It serves a population of approximately 4,120 people, classifying it as a small to medium agglomeration under French and EU regulations. The plant is situated inland, more than 10 kilometers from the coast, but within 50 kilometers of the English Channel. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 5,000 cubic meters per day and an average daily discharge of 735 cubic meters, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The advanced treatment likely includes nutrient removal to protect sensitive receiving waters. The treated effluent is discharged into local watercourses that ultimately drain into the English Channel via the Couesnon River or other coastal rivers. The Bretagne region is known for its sensitive aquatic environments, including estuaries and coastal zones that support diverse marine life. The plant's advanced treatment helps minimize nutrient loading and protect downstream water quality in this ecologically important area.

The plant discharges into local streams that flow toward the English Channel, likely via the Couesnon River basin. This coastal region supports diverse aquatic habitats, including estuaries and intertidal zones that are important for migratory fish and bird species. Advanced treatment at the plant reduces nutrient and pollutant loads, helping to protect the sensitive marine environment from eutrophication and other impacts.