ST GENIEZ D OLT Wastewater Treatment Plant, Sainte-Eulalie-d'Olt, Occitanie

ST GENIEZ D OLT is an advanced wastewater treatment plant located in Sainte-Eulalie-d'Olt, a commune in the Aveyron department of Occitanie, southern France. The plant serves a population of approximately 1,995 people, reflecting its role in a small rural agglomeration. The plant employs advanced treatment processes, which go beyond the secondary treatment mandated by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Its designed capacity of 5,300 m³/day provides a buffer for seasonal population fluctuations common in rural tourist areas. The plant discharges a treated wastewater volume of 355.9 m³/day. The treated effluent is discharged into the local watershed, which ultimately drains into the Lot River, a major tributary of the Garonne. The Garonne flows into the Gironde estuary and the Atlantic Ocean. The plant's advanced treatment helps protect the Lot River's water quality, supporting aquatic life and downstream uses such as agriculture and recreation.

The plant discharges into the Lot River basin, which flows through the Aveyron region before joining the Garonne River. The Garonne estuary is a vital ecological corridor for migratory fish species, including Atlantic salmon and European eel. Advanced treatment at this plant reduces nutrient loading, helping to prevent eutrophication in downstream waters and supporting the ecological health of the Lot-Garonne system.