ANTRAIN Wastewater Treatment Plant, Val-Couesnon, Bretagne, France

ANTRAIN is a wastewater treatment plant located in Val-Couesnon, in the Bretagne region of France. It serves a population of approximately 25,430, classifying it as a medium agglomeration under EU regulations. The plant is situated in the historic town of Antrain, now part of the commune of Val-Couesnon, in the Ille-et-Vilaine department. As a French facility, ANTRAIN operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations of this size. French wastewater infrastructure is typically managed by local authorities or private operators under contract, with compliance monitored by the Agence de l'Eau. The plant's treated effluent is discharged into the Couesnon River, which flows into the Baie du Mont-Saint-Michel, a UNESCO World Heritage site. The bay is an ecologically sensitive area supporting diverse birdlife and marine habitats. The plant plays a key role in protecting this downstream environment from nutrient pollution.

ANTRAIN discharges into the Couesnon River, which flows into the Baie du Mont-Saint-Michel, a highly sensitive coastal ecosystem. The bay is known for its tidal flats and supports migratory birds and marine species. The plant's treatment helps reduce nutrient loads that could cause eutrophication in this important estuary.