Die Chef lieu Wastewater Treatment Plant, Die, Auvergne-Rhône-Alpes

Die Chef lieu is a wastewater treatment plant located in Die, a commune in the Drôme department of the Auvergne-Rhône-Alpes region in southeastern France. The plant serves a population equivalent of 22,450, classifying it as a medium agglomeration 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 of this size. The directive also mandates more advanced treatment if the receiving waters are designated as sensitive areas, such as those prone to eutrophication. The plant's treated effluent is discharged into the Drôme River, a tributary of the Rhône River. The Rhône flows into the Mediterranean Sea, making the plant's operations relevant to the ecological health of both the local riverine environment and the coastal waters of the Gulf of Lion.

The plant discharges into the Drôme River, which flows into the Rhône River, ultimately reaching the Mediterranean Sea. The Drôme River supports diverse aquatic life and is an important corridor for migratory fish. The downstream Rhône delta and coastal zone are ecologically sensitive, with habitats that depend on good water quality to prevent eutrophication and protect biodiversity.