Craponne-sur-Arzon Le Bourg Wastewater Treatment Plant, Auvergne-Rhône-Alpes

Craponne-sur-Arzon Le Bourg is a wastewater treatment plant located in the commune of Craponne-sur-Arzon, within the Haute-Loire department of the Auvergne-Rhône-Alpes region in France. The plant serves a population of 1,615 and has a designed capacity of 4,200 m³ per day, with an average discharge volume of 288 m³ per day. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. The treated effluent is discharged into the local watershed, which ultimately drains into the Loire River via the Arzon River. The Loire basin is ecologically significant, supporting diverse aquatic life and serving as a migratory corridor for fish species. The plant's advanced treatment helps maintain water quality in this important river system.

The plant discharges into the Arzon River, a tributary of the Loire River. The Loire is one of France's longest rivers and its basin supports a rich diversity of aquatic habitats, including wetlands and floodplains that are important for migratory birds and fish. Advanced treatment at the plant reduces nutrient loading, helping to prevent eutrophication in downstream waters.