Villard-de-Lans Fenat Wastewater Treatment Plant, Auvergne-Rhône-Alpes

The Villard-de-Lans Fenat wastewater treatment plant is located in the commune of Villard-de-Lans, within the Isère department of the Auvergne-Rhône-Alpes region in southeastern France. Situated in the Vercors massif, the plant serves a population of approximately 27,000 residents, covering the local urban area and surrounding communities. As a facility serving a medium-sized agglomeration, the plant is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for inland discharges. The plant's treatment process and capacity are designed to meet these regulatory standards, ensuring effective removal of organic matter and nutrients before discharge. The treated effluent is discharged into the local watershed, which drains into the Bourne River, a tributary of the Isère River, and ultimately flows into the Rhône River and the Mediterranean Sea. The plant plays a key role in protecting the sensitive karstic environment of the Vercors region, supporting water quality for downstream ecosystems and recreational uses.

The plant discharges into the Bourne River, a tributary of the Isère River, which flows into the Rhône River and eventually the Mediterranean Sea. The Vercors region features a karstic landscape with permeable limestone, making groundwater particularly vulnerable to contamination. The plant's treatment helps protect downstream aquatic habitats and the ecological integrity of the Rhône basin, which supports diverse fish species and migratory birds.