NEYDENS Wastewater Treatment Plant, Neydens, Auvergne-Rhône-Alpes, France

NEYDENS is a wastewater treatment plant located in Neydens, a commune in the Haute-Savoie department of the Auvergne-Rhône-Alpes region, France. The plant serves a population of approximately 7,526 residents, placing it in the small-to-medium agglomeration category under EU classification. As a French facility, NEYDENS operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The treated effluent from NEYDENS is discharged into the local watershed, which ultimately drains into the Rhône River basin. The Rhône flows southward through southeastern France, passing through Lake Geneva (Lac Léman) before continuing to the Mediterranean Sea. This water body supports diverse aquatic ecosystems and is a vital resource for the region.

NEYDENS discharges into the local watershed within the Rhône River basin. The Rhône originates in the Swiss Alps, flows through Lake Geneva, and traverses southeastern France before emptying into the Mediterranean Sea. This river system supports diverse aquatic life, including fish species such as trout and grayling, and provides critical habitat for migratory birds. The plant's location in a semi-rural area near the Swiss border underscores the importance of maintaining water quality in this transboundary basin.