Bordeaux Canejan La House Wastewater Treatment Plant, Canéjan, Nouvelle-Aquitaine

Bordeaux Canejan La House is a wastewater treatment facility located in Canéjan, a commune in the Gironde department of Nouvelle-Aquitaine, southwestern France. The plant serves a population of approximately 3,805, classifying it as a small agglomeration under French and EU regulations. It is situated within the metropolitan area of Bordeaux, a major urban center. 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 4,500 cubic meters per day and an average daily discharge volume of about 679 cubic meters, the facility operates well below its capacity, indicating robust treatment infrastructure. The advanced treatment likely includes nutrient removal to protect sensitive receiving waters. Treated effluent from the plant is discharged into local watercourses that ultimately drain into the Garonne River, a major river in southwestern France that flows into the Gironde estuary and the Atlantic Ocean. The plant plays a key role in protecting the Garonne basin's water quality, supporting aquatic ecosystems and downstream uses such as drinking water supply and recreation.

The plant discharges into the Garonne River basin, which flows through Bordeaux and into the Gironde estuary, a large coastal estuary on the Atlantic Ocean. The Garonne supports diverse aquatic life, including migratory fish species such as Atlantic salmon and European eel. Advanced treatment at this plant helps reduce nutrient loads, mitigating eutrophication risks in the estuary and coastal waters.