LEZAT SUR LEZE Wastewater Treatment Plant, Lézat-sur-Lèze, Occitanie

LEZAT SUR LEZE is an advanced wastewater treatment plant located in Lézat-sur-Lèze, a commune in the Ariège department of Occitanie, southern France. The plant serves a population of approximately 1,468 residents, making it a small-scale facility within the region's municipal infrastructure. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 2,500 cubic meters per day and a discharge volume of 261.89 cubic meters per day, the facility operates well within its capacity. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), small agglomerations like this are required to provide appropriate treatment, and the advanced level here indicates a commitment to high environmental standards. The treated effluent is discharged into the local watershed, which ultimately drains into the Lèze River, a tributary of the Ariège River, and then into the Garonne River before reaching the Atlantic Ocean. This waterway supports diverse aquatic life and is important for regional biodiversity. The plant's advanced treatment helps protect these downstream ecosystems from nutrient pollution and other contaminants.

The plant discharges into the Lèze River, which flows into the Ariège River, a major tributary of the Garonne River. The Garonne eventually reaches the Atlantic Ocean via the Gironde estuary. This watershed supports diverse aquatic habitats and is an important corridor for migratory fish species. The advanced treatment at LEZAT SUR LEZE helps maintain water quality in this ecologically sensitive river system.