TRELISSAC nouvelle step Wastewater Treatment Plant, Trélissac, France

TRELISSAC nouvelle step is a municipal wastewater treatment plant located in Trélissac, a commune in the Dordogne department of Nouvelle-Aquitaine, southwestern France. The plant serves a population of approximately 5,660, placing it in the small-to-medium agglomeration category under French regulations. As a French wastewater facility, the plant operates under the European Union's Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size discharging into freshwater. The regulatory framework ensures compliance with national standards for effluent quality. The plant's treated effluent is discharged into the local water network, which ultimately drains into the Dordogne River. The Dordogne River flows westward through the region and into the Gironde estuary on the Atlantic coast. The watershed supports diverse aquatic life and is an important ecological corridor in southwestern France.

The plant discharges into the Dordogne River basin, a major watercourse in Nouvelle-Aquitaine that flows into the Gironde estuary and the Atlantic Ocean. The Dordogne River supports diverse aquatic ecosystems, including fish species such as salmon and lamprey, and its floodplains provide important habitats for migratory birds. The region's water quality is managed under the EU Water Framework Directive, with monitoring to protect ecological health.