Vierzon Les Vallées Wastewater Treatment Plant, Vierzon, France

The Vierzon Les Vallées wastewater treatment plant is located in Vierzon, a commune in the Cher department of the Centre-Val de Loire region, France. The plant serves a population of approximately 26,089, classifying it as a medium-sized agglomeration under EU regulations. Its location along the Route de la Lœuf places it within the Yèvre river watershed, which ultimately drains into the Loire River. As a French wastewater facility, the plant is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations of this size. The directive also requires appropriate treatment before discharge into sensitive areas, which may apply to the Loire basin. The plant is expected to meet these regulatory standards to protect water quality. The plant's treated effluent is discharged into the local water system, contributing to the Yèvre River, a tributary of the Cher River, which flows into the Loire River. The Loire is one of France's longest rivers and supports diverse aquatic ecosystems, including migratory fish species. Proper treatment at this plant helps maintain the ecological health of the Loire basin and downstream environments.

The plant discharges into the Yèvre River, a tributary of the Cher River, which flows into the Loire River. The Loire basin is ecologically significant, supporting diverse aquatic life and migratory fish such as Atlantic salmon and European eel. The region's agricultural and urban areas rely on the river's water quality, making effective wastewater treatment essential for preserving downstream habitats and biodiversity.