BONNETABLE La Grande Brancherie Wastewater Treatment Plant, Bonnétable, France

BONNETABLE La Grande Brancherie is a wastewater treatment plant located in Bonnétable, a commune in the Sarthe department of the Pays de la Loire region, France. The plant serves a small population of approximately 50 people, reflecting its role in a rural or small community setting. It is situated inland, away from coastal areas, and operates under the regulatory framework of the European Union and French national water laws. The plant provides secondary treatment, which is the standard biological treatment stage required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The designed capacity is 100 m³/day, with an actual discharge volume of 8.92 m³/day, indicating that the plant operates well below its capacity. As a small facility, it is subject to national monitoring and permitting by French authorities, ensuring compliance with environmental standards. The treated effluent is discharged into a local watercourse, likely a tributary of the Sarthe River, which flows into the Loire River and eventually reaches the Atlantic Ocean. The plant plays a key role in protecting the local watershed from pollution, supporting aquatic life and downstream water quality in the Loire basin.

The plant discharges into a local watercourse that is part of the Sarthe River basin, a tributary of the Loire River. The Loire is one of France's longest rivers and flows into the Atlantic Ocean, supporting diverse aquatic ecosystems. The region is characterized by agricultural land use, and the plant helps mitigate nutrient and organic pollution that could otherwise impact downstream water quality and biodiversity.