Cosse-le-Vivien Wastewater Treatment Plant - Advanced Treatment in Pays de la Loire

The Cosse-le-Vivien wastewater treatment plant is located in the Pays de la Loire region of northwestern France, serving the commune of Cossé-le-Vivien and surrounding areas. This facility is part of France's extensive wastewater infrastructure, which is regulated under the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant employs advanced treatment processes, ensuring a high level of pollutant removal before discharge. With a designed capacity of 4,250 m³/day and an average daily flow of 397.29 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 eventually drain into the Atlantic Ocean via the Loire River basin. The plant plays a key role in protecting the region's water quality, supporting aquatic ecosystems and downstream uses such as agriculture and recreation.

The plant discharges into the local watershed, which is part of the larger Loire River basin. The Loire is one of France's longest rivers, flowing into the Atlantic Ocean. The downstream environment supports diverse aquatic life, including migratory fish species. Advanced treatment helps minimize nutrient loading and protects the ecological health of receiving waters.