LUMBIN _ LA TERRASSE Wastewater Treatment Plant, La Terrasse, France

LUMBIN _ LA TERRASSE is a wastewater treatment plant located in La Terrasse, within the Isère department of the Auvergne-Rhône-Alpes region in southeastern France. The plant serves a population of approximately 3,915 residents, placing it in the small agglomeration category under French and EU regulations. 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. Its designed capacity is 6,000 m³/day, with a reported discharge volume of 698.43 m³/day, indicating ample reserve capacity. The plant operates under the French regulatory framework, which implements the EU directive through national legislation, and is subject to permits issued by the local water agency. The treated effluent is discharged into the local watershed, which ultimately drains into the Isère River, a major tributary of the Rhône River. The Rhône flows into the Mediterranean Sea, making the plant part of a large transboundary river basin. The advanced treatment helps protect downstream aquatic ecosystems and supports water quality in the sensitive Alpine foothills environment.

The plant discharges into the Isère River basin, which flows into the Rhône River and then to the Mediterranean Sea. The local watershed includes the Grésivaudan valley, an ecologically sensitive area supporting diverse aquatic life and important migratory corridors for fish species. Advanced treatment reduces nutrient loading, helping to prevent eutrophication in downstream water bodies.