ST GERMAIN AU MONT D OR Wastewater Treatment Plant, Saint-Germain-au-Mont-d'Or, France

ST GERMAIN AU MONT D OR is a wastewater treatment plant located in Saint-Germain-au-Mont-d'Or, a commune in the Lyon metropolitan area within the Auvergne-Rhône-Alpes region of France. The plant serves a population of approximately 2,500 people, reflecting its role in managing domestic wastewater for a small community on the outskirts of Lyon. 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. With a design capacity of 3,833 m³ per day and a current discharge volume of about 448 m³ per day, the facility operates well below its capacity, indicating room for future growth or seasonal variability. Treated effluent from the plant is discharged into the local watershed, which ultimately drains into the Saône River, a major tributary of the Rhône. The Rhône flows south to the Mediterranean Sea, making the plant's advanced treatment important for protecting downstream water quality and aquatic ecosystems in the Rhône basin.

The plant discharges into the Saône River basin, which flows into the Rhône River and then to the Mediterranean Sea. The Saône supports diverse aquatic life and is an important migratory corridor for fish species. Advanced treatment helps reduce nutrient loads and protect the ecological health of these downstream water bodies.