CHATEAU D OLONNE Le Petit Plessis Wastewater Treatment Plant, Les Sables-d'Olonne

The CHATEAU D OLONNE Le Petit Plessis wastewater treatment plant is located in Les Sables-d'Olonne, a coastal town in the Pays de la Loire region of western France. The facility serves a population of approximately 109,433, classifying it as a large agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). Its location near Port Olona places it in a sensitive coastal environment. As a large agglomeration, the plant is expected to provide at least secondary treatment under the UWWTD, with more stringent requirements if the receiving waters are designated as sensitive areas. The plant's designed capacity is 1.00 (likely in thousands of cubic meters per day), indicating a substantial infrastructure to handle the region's wastewater. The regulatory framework ensures compliance with European standards. The plant discharges treated effluent into the Atlantic Ocean via the coastal waters near Les Sables-d'Olonne. This area is ecologically sensitive, supporting diverse marine life and serving as a habitat for migratory species. The plant plays a crucial role in protecting the coastal ecosystem from nutrient pollution and pathogens, thereby maintaining water quality for tourism and fisheries.

The plant discharges into the Atlantic Ocean near Les Sables-d'Olonne, a coastal area within the Bay of Biscay. The receiving waters support diverse marine ecosystems, including seagrass beds and fish nurseries, and are important for migratory birds. The region's coastal zone is sensitive to nutrient enrichment, making effective wastewater treatment essential for preserving water quality and biodiversity.