ROCHESERVIERE Moulin de Graveau Wastewater Treatment Plant, Rocheservière, Pays de la Loire

ROCHESERVIERE Moulin de Graveau is an advanced wastewater treatment plant located in Rocheservière, a commune in the Vendée department of Pays de la Loire, France. The plant serves a population of approximately 3,650 people and has a design capacity of 2,800 m³/day, with an average discharge volume of 651.15 m³/day. It is situated inland, more than 50 km from the coast. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. As a French facility, it operates under national regulations transposing the EU directive, with permits issued by the local water agency (Agence de l'Eau). The treated effluent is discharged into the local watershed, which ultimately drains 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 within the Loire River basin, one of France's largest river systems. The Loire flows into the Atlantic Ocean, supporting diverse aquatic life and important migratory fish species such as Atlantic salmon and European eel. The region's waterways are ecologically sensitive, and advanced treatment helps reduce nutrient loads that could cause eutrophication in downstream estuaries and coastal zones.