SAINT CLAR DE RIVIERE 2 Wastewater Treatment Plant, Saint-Clar-de-Rivière, Occitanie

SAINT CLAR DE RIVIERE 2 is a wastewater treatment plant located in Saint-Clar-de-Rivière, a commune in the Haute-Garonne department of Occitanie, southern France. The plant serves a population of approximately 4,314 people and has a designed capacity of 6,000 cubic meters per day, with an average discharge volume of 769.61 m³/day. The plant employs advanced treatment processes, which go beyond the secondary treatment requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size (under 10,000 population equivalent), the directive mandates secondary treatment, but the plant's advanced level indicates additional nutrient removal or polishing, likely to protect sensitive receiving waters. The treated effluent is discharged into the local watershed, which ultimately drains into the Garonne River via smaller tributaries. The Garonne flows through southwestern France and into the Gironde estuary, supporting diverse aquatic life and agricultural water use. The plant's advanced treatment helps minimize nutrient loading and protect downstream ecosystems.

The plant discharges into the Garonne River basin, which flows through the Occitanie region and eventually reaches the Gironde estuary on the Atlantic coast. The Garonne supports a variety of fish species, including migratory salmonids, and its waters are used for irrigation and drinking water supply. Advanced treatment at this plant reduces the risk of eutrophication in the river and estuary, contributing to the ecological health of the watershed.