ST HILAIRE DE LOULAY Le Noyer Wastewater Treatment Plant, Montaigu-Vendée, France

ST HILAIRE DE LOULAY Le Noyer is a wastewater treatment plant located in the Le Noyer area of Saint-Hilaire-de-Loulay, within the commune of Montaigu-Vendée in the Pays de la Loire region of France. The plant serves a population of approximately 2,917 people, classifying it as a small agglomeration under French regulations. The plant provides advanced treatment, which goes beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 3,000 m³/day and an average discharge volume of 520.39 m³/day, the facility operates well within its capacity, ensuring effective treatment of municipal wastewater. The treated effluent is discharged into the local watershed, which ultimately drains into the Atlantic Ocean via the Vendée River and the Bay of Biscay. The plant plays a key role in protecting the region's water quality, supporting aquatic ecosystems and downstream environments.

The plant discharges into the local watershed that feeds the Vendée River, which flows into the Bay of Biscay on the Atlantic coast. This region supports diverse aquatic life and is important for migratory fish species. The advanced treatment helps minimize nutrient loading and protects the downstream marine environment from eutrophication.