SAINT NAZAIRE EN ROYANS INTERCO Wastewater Treatment Plant, La Baume-d'Hostun, France

SAINT NAZAIRE EN ROYANS INTERCO is a wastewater treatment plant located in La Baume-d'Hostun, a commune in the Drôme department of the Auvergne-Rhône-Alpes region, France. The plant serves a population of 7,100, placing it in the medium agglomeration category under EU regulations. As a French facility, the plant operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations between 2,000 and 10,000 population equivalent discharging into freshwater. The regulatory framework ensures appropriate treatment standards are met. The plant's treated effluent is discharged into the local watershed, which drains into the Isère River, a major tributary of the Rhône. The Rhône River flows into the Mediterranean Sea, making the plant's operations important for protecting downstream aquatic ecosystems and coastal water quality in the Gulf of Lion.

The plant discharges into the Isère River basin, which flows into the Rhône River and ultimately the Mediterranean Sea. The downstream environment includes ecologically sensitive areas such as the Rhône Delta and the Camargue, a region that supports diverse aquatic life and migratory bird populations. Proper wastewater treatment is essential to prevent nutrient enrichment and maintain water quality in these downstream habitats.