Rochemaure Wastewater Treatment Plant - Advanced Treatment, Rhône Basin

The Rochemaure wastewater treatment plant is located in the commune of Rochemaure, in the Ardèche department of the Auvergne-Rhône-Alpes region, France. It serves a population of approximately 2,031 people, classifying it as a small agglomeration under French and EU regulations. The plant is situated near the Rhône River valley, an area with a mix of residential and agricultural land use. 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. Its designed capacity is 2,500 m³/day, and it currently discharges an average of 362 m³/day, indicating significant spare capacity. The facility is operated as part of the municipal wastewater infrastructure managed by the local authority. Treated effluent from the plant is discharged into the local hydrological network, which ultimately drains into the Rhône River, one of Europe's major waterways. The Rhône flows southward to the Mediterranean Sea, supporting diverse aquatic ecosystems and providing water for irrigation and industry. The advanced treatment level helps protect the Rhône's water quality and the downstream environments, including the Camargue delta and coastal lagoons.

The plant discharges into a tributary of the Rhône River, which flows through the Rhône Valley and into the Mediterranean Sea. The Rhône basin supports a variety of habitats, including riparian forests and wetlands, and is an important migratory corridor for fish such as the European eel. Advanced treatment at this plant reduces nutrient and pollutant loads, helping to maintain the ecological health of the river and its downstream receiving waters.