Saint-Léger-sur-Sarthe Wastewater Treatment Plant, Normandy, France

The Saint-Léger-sur-Sarthe wastewater treatment plant is located in the commune of Saint-Léger-sur-Sarthe in the Orne department of Normandy, France. It serves a population of approximately 2,400 residents, placing it in the small agglomeration category under French and EU regulations. The plant provides advanced treatment, which goes beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 2,500 m³/day and an average discharge volume of 427 m³/day, the facility operates well within its capacity. The plant is operated as part of the municipal wastewater infrastructure, likely under the oversight of the local water authority. The treated effluent is discharged into the Sarthe River, which flows through the region and eventually joins the Maine River, a tributary of the Loire River. The Loire drains into the Atlantic Ocean. The plant's advanced treatment helps protect the Sarthe River's water quality, supporting aquatic life and downstream uses.

The plant discharges into the Sarthe River, a tributary of the Maine River, which flows into the Loire River and ultimately the Atlantic Ocean. The Sarthe River supports diverse aquatic life and is used for recreation and agriculture. Advanced treatment reduces nutrient loads, helping to prevent eutrophication in downstream waters.