LASSAY LES CHATEAUX Wastewater Treatment Plant, Lassay-les-Châteaux, France

LASSAY LES CHATEAUX is a wastewater treatment plant located in Lassay-les-Châteaux, a commune in the Mayenne department of Pays de la Loire, France. The plant serves a population of about 9,933, placing it in the medium agglomeration category under French and EU regulations. As a facility in France, the plant operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The directive also mandates more advanced treatment if the receiving waters are designated as sensitive areas. The regulatory framework ensures compliance with European standards. The treated effluent is discharged into the local watershed, which ultimately drains into the Mayenne River, a tributary of the Loire River. The Loire River flows into the Atlantic Ocean, making the plant's operations important for protecting downstream aquatic ecosystems and water quality in the Loire basin.

The plant discharges into the Mayenne River watershed, which flows into the Loire River and then the Atlantic Ocean. The Loire basin supports diverse aquatic life and is an important ecological corridor. The plant's treatment helps protect water quality in this sensitive river system, which is subject to EU regulations for nutrient removal in designated sensitive areas.