SAINT OUEN Rocheboyer Wastewater Treatment Plant, Saint-Ouen, France

SAINT OUEN Rocheboyer is an advanced wastewater treatment plant located in Saint-Ouen, a commune in the Loir-et-Cher department of the Centre-Val de Loire region, France. The plant serves a population of approximately 4,286 people, with a designed capacity of 5,000 m³/day and a current discharge volume of 764.61 m³/day, indicating it operates well below its capacity. As an advanced treatment facility, SAINT OUEN Rocheboyer provides tertiary-level treatment, which includes nutrient removal and disinfection beyond secondary biological processes. This level of treatment is consistent with the requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC) for sensitive areas, ensuring high-quality effluent before discharge. The plant's treated effluent is discharged into the local watershed, which ultimately drains into the Loire River basin. The Loire River is one of France's longest rivers, flowing into the Atlantic Ocean. The advanced treatment helps protect the downstream aquatic ecosystems, including fish habitats and biodiversity, from nutrient pollution and other contaminants.

The plant discharges into the Loire River basin, which flows through central France before reaching the Atlantic Ocean. The Loire is known for its diverse aquatic life, including migratory fish species such as Atlantic salmon and European eel. Advanced treatment at this plant helps reduce nutrient loading, protecting downstream water quality and supporting the ecological health of the river and its estuary.