Les Déserts La Féclaz Wastewater Treatment Plant | Savoie, France

The Les Déserts La Féclaz wastewater treatment plant is located in the commune of Les Déserts, within the Savoie department of the Auvergne-Rhône-Alpes region in southeastern France. The plant serves a population of approximately 2,368 residents, operating as a secondary treatment facility under French and European regulatory frameworks. As a secondary treatment plant, it employs biological processes to reduce organic matter and suspended solids, meeting the standards required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The plant has a designed capacity of 2,500 cubic meters per day, with an average daily discharge volume of 422.45 cubic meters, indicating ample capacity for current loads. The treated effluent is discharged into the local watershed, which ultimately drains into the Rhône River basin via the Leysse River and Lake Bourget. This water body is ecologically significant, supporting diverse aquatic life and serving as a key recreational and environmental resource in the region.

The plant discharges into the Leysse River catchment, which flows into Lake Bourget, the largest natural lake in France. Lake Bourget is a sensitive ecosystem that supports diverse aquatic flora and fauna, including migratory fish species. The lake ultimately drains via the Canal de Savières into the Rhône River, which flows to the Mediterranean Sea. The plant's secondary treatment helps protect this downstream environment from nutrient pollution and organic loading.