LEZAY Wastewater Treatment Plant, Lezay, Nouvelle-Aquitaine

LEZAY is a wastewater treatment plant located in Lezay, a commune in the Deux-Sèvres department of Nouvelle-Aquitaine, France. The facility serves a population of approximately 1,898 residents and operates with a designed capacity of 2,000 cubic meters per day, with an average discharge volume of 338.6 m³/day. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. This level of treatment is typically implemented in sensitive areas to reduce nutrient loads and protect receiving water bodies. The treated effluent is discharged into local waterways that ultimately drain into the Atlantic Ocean via the Sèvre Niortaise river basin. The plant's advanced treatment helps safeguard the ecological health of downstream aquatic environments, supporting biodiversity and water quality in the region.

The plant discharges into the local watershed, which is part of the Sèvre Niortaise basin, flowing westward into the Bay of Biscay (Atlantic Ocean). The region supports diverse aquatic life and is an important area for migratory fish species. Advanced treatment at this facility helps reduce nutrient pollution, protecting downstream ecosystems from eutrophication.