Vienne Wastewater Treatment Plant, Reventin-Vaugris, Auvergne-Rhône-Alpes

The Vienne wastewater treatment plant is located in Reventin-Vaugris, a commune in the Isère department of the Auvergne-Rhône-Alpes region in southeastern France. The plant serves a population of approximately 68,706 people, classifying it as a medium to large agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). Under the EU UWWTD, agglomerations of this scale are required to provide at least secondary treatment, with more stringent requirements if the receiving waters are designated as sensitive areas. The regulatory framework ensures compliance with European standards for wastewater treatment. The treated effluent from the plant is discharged into the local water system, which ultimately drains into the Rhône River, one of the major rivers in Europe. The Rhône flows into the Mediterranean Sea, making the plant's operations important for protecting downstream aquatic ecosystems and coastal water quality.

The plant discharges into the Rhône River basin, which flows southward through the Rhône Valley and into the Mediterranean Sea. The Rhône is a major European river supporting diverse aquatic life and providing water for agriculture, industry, and recreation. The plant's operations help protect the river's water quality and the downstream delta ecosystem, which is ecologically sensitive and supports migratory fish species.