LISLE SUR TARN Wastewater Treatment Plant, Loupiac, Occitanie

LISLE SUR TARN is an advanced wastewater treatment plant located in Loupiac, near Lisle-sur-Tarn in the Occitanie region of southern France. The plant serves a population of approximately 2,050 people and is part of the municipal infrastructure for the Tarn department. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 2,500 m³/day and a current discharge volume of 365.72 m³/day, the facility operates well within its capacity. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants serving agglomerations under 10,000 population equivalent are typically required to provide secondary treatment, but this plant's advanced treatment indicates a higher level of environmental protection. The treated effluent is discharged into the local watershed, which ultimately drains into the Tarn River, a tributary of the Garonne River, and then into the Gironde estuary and the Atlantic Ocean. The plant plays a key role in protecting the water quality of the Tarn River and downstream ecosystems.

The plant discharges into the Tarn River basin, which flows into the Garonne River and eventually reaches the Gironde estuary and the Atlantic Ocean. The Tarn River supports diverse aquatic life and is important for regional biodiversity. The advanced treatment helps reduce nutrient loading, protecting downstream water bodies from eutrophication and maintaining ecological balance in the watershed.