Châteauneuf du Rhône Chef lieu Wastewater Treatment Plant, Auvergne-Rhône-Alpes

Châteauneuf du Rhône Chef lieu is a municipal wastewater treatment plant located in Châteauneuf-du-Rhône, a commune in the Drôme department of the Auvergne-Rhône-Alpes region, southeastern France. The plant serves a population of 1,550 and is designed to handle a capacity of 2,250 m³ per day, with an actual discharge volume of 276.52 m³ per day. 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. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. As a French facility, it operates under national regulations transposing the directive, with permits issued by the local water agency (Agence de l'Eau). The treated effluent is discharged into the local watershed, which ultimately drains into the Rhône River, one of Europe's major rivers flowing into the Mediterranean Sea. The Rhône basin supports diverse aquatic ecosystems and is an important migratory corridor for fish species. The plant's advanced treatment helps minimize nutrient loading and protect downstream water quality in the Rhône delta and the Gulf of Lion.

The plant discharges into the Rhône River basin, which flows southward through southeastern France to the Mediterranean Sea. The Rhône is a major European river supporting diverse aquatic life, including migratory fish like the European eel and various bird species in its delta. Advanced treatment at this plant reduces nutrient and pollutant loads, helping to protect the sensitive coastal ecosystems of the Camargue region and the Gulf of Lion from eutrophication.