SAINT DIDIER DE FORMANS Wastewater Treatment Plant, Auvergne-Rhône-Alpes, France

The SAINT DIDIER DE FORMANS wastewater treatment plant is located in Saint-Didier-de-Formans, a commune in the Ain department of the Auvergne-Rhône-Alpes region, France. The plant serves a population of approximately 4,700 residents and operates with advanced treatment processes, reflecting the high environmental standards required in this region. With a designed capacity of 4,500 m³/day and an average daily discharge of 838.47 m³, the plant operates well below its capacity, indicating room for future growth. As a French facility, it complies with the European Union's Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment as a minimum and tertiary treatment in sensitive areas. The advanced treatment level suggests the plant likely includes nutrient removal to protect receiving waters. The plant's treated effluent is discharged into local watercourses that ultimately drain into the Saône River, a major tributary of the Rhône. The Rhône flows into the Mediterranean Sea, making the plant's performance critical for downstream ecosystems, including the Camargue delta and coastal waters. The advanced treatment helps minimize nutrient loading and protects aquatic biodiversity.

The plant discharges into the local watershed that feeds the Saône River, which joins the Rhône near Lyon. The Rhône is one of Europe's major rivers, supporting diverse aquatic life and flowing into the Mediterranean Sea. The advanced treatment at this plant reduces nutrient and pollutant loads, helping to protect downstream water quality in the Rhône basin and the sensitive coastal ecosystems of the Camargue region.