Mortagne au Perche Saint Langis les Mortagne Wastewater Treatment Plant, Normandy, France

Mortagne au Perche Saint Langis les Mortagne is a wastewater treatment plant located in Saint-Denis-sur-Huisne, within the commune of Mortagne-au-Perche in the Orne department of Normandy, France. The plant serves a population of approximately 7,889 people, placing it in the medium agglomeration category under French and EU regulations. As a facility operating under the EU Urban Waste Water Treatment Directive (91/271/EEC), the plant is required to provide secondary treatment as a minimum standard for agglomerations of this size. The directive also mandates more advanced treatment if the receiving waters are designated as sensitive areas, such as those prone to eutrophication. The regulatory framework ensures compliance with national and EU standards. The treated effluent from the plant is discharged into the local watershed, which ultimately drains into the Huisne River, a tributary of the Sarthe, then the Maine, and finally the Loire River. The Loire flows into the Atlantic Ocean. The plant plays a key role in protecting the water quality of the Huisne River and downstream ecosystems, supporting aquatic life and recreational uses.

The plant discharges into the Huisne River, which flows into the Sarthe, then the Maine, and finally the Loire River, one of France's major rivers. The Loire basin supports diverse aquatic habitats and is important for migratory fish species. The plant's operations help maintain water quality in this ecologically sensitive watershed, preventing nutrient pollution that could lead to eutrophication in downstream water bodies.