Buis les Baronies Chef lieu Wastewater Treatment Plant, Buis-les-Baronnies, France

Buis les Baronies Chef lieu is a municipal wastewater treatment plant located in Buis-les-Baronnies, a commune in the Drôme department of the Auvergne-Rhône-Alpes region in southeastern France. The plant serves a population of approximately 5,567 residents and has a designed capacity of 5,500 cubic meters per day, with an actual discharge volume of 993.14 cubic meters per day. As a secondary treatment facility, the plant provides biological treatment to remove organic matter and suspended solids, meeting the standards required under the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size (between 2,000 and 10,000 population equivalent), the directive mandates secondary treatment as a minimum, which this plant fulfills. The treated effluent is discharged into the local watershed, which ultimately drains into the Rhône River basin. The plant plays a key role in protecting the water quality of the Ouvèze River, a tributary of the Rhône, and supports the ecological health of the region's aquatic ecosystems.

The plant discharges into the Ouvèze River, a tributary of the Rhône River, which flows into the Mediterranean Sea. The watershed supports diverse aquatic life and is important for regional biodiversity. The secondary treatment process helps reduce nutrient loads and organic pollution, contributing to the ecological balance of the downstream water bodies.