Bréal-sous-Montfort Wastewater Treatment Plant - Brittany, France

The Bréal-sous-Montfort wastewater treatment plant is located in the commune of Bréal-sous-Montfort, in the Ille-et-Vilaine department of Brittany, France. The facility serves a population of approximately 6,600 residents, classifying it as a small to medium agglomeration under European Union regulations. As a French wastewater treatment plant, it operates within the framework of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for discharges into freshwater and estuaries from agglomerations of this scale. The plant's treatment processes and capacity details are not publicly available, but the regulatory framework ensures compliance with national standards for effluent quality. The plant discharges treated wastewater into local watercourses that ultimately drain into the Vilaine River basin and the Bay of Biscay. The surrounding region is characterized by agricultural landscapes and small rivers, making proper treatment essential for protecting downstream aquatic ecosystems and water quality.

The treated effluent from Bréal-sous-Montfort flows into small streams that are part of the Vilaine River catchment, which discharges into the Bay of Biscay on the Atlantic coast. The Vilaine basin supports diverse freshwater habitats and is important for migratory fish species. The plant's location inland, more than 50 km from the coast, reduces direct marine impact, but its discharge contributes to the overall nutrient load in the watershed, requiring effective treatment to prevent eutrophication.