CHAZAY D AZERGUES LE MOULIN Wastewater Treatment Plant, Chazay-d'Azergues, France

CHAZAY D AZERGUES LE MOULIN is a wastewater treatment facility located in Chazay-d'Azergues, a commune in the Rhône department of the Auvergne-Rhône-Alpes region, France. The plant serves a population of approximately 2,849 residents, classifying it as a small agglomeration under French and EU regulations. It is situated inland, away from coastal areas, and its treated effluent contributes to the local water cycle. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The designed capacity is 4,083 m³/day, with a current discharge volume of 508.26 m³/day, indicating ample reserve capacity. As a French facility, it operates under national regulations transposing the EU directive, with permits issued by the local water agency (Agence de l'Eau). The treated wastewater is discharged into the local hydrological network, which ultimately drains into the Saône River, a major tributary of the Rhône. The Rhône flows into the Mediterranean Sea via the Camargue delta. The plant's advanced treatment helps protect the Saône and Rhône rivers from nutrient pollution, supporting aquatic biodiversity and downstream water quality in the Mediterranean basin.

The plant discharges into the local watercourse that feeds into the Saône River, which joins the Rhône River near Lyon. The Rhône flows southward through the Camargue region into the Mediterranean Sea. This watershed supports diverse aquatic life, including migratory fish species such as the European eel. Advanced treatment reduces nutrient loads, mitigating eutrophication risks in the Rhône delta and coastal marine environment.