AUXON MISEREY Wastewater Treatment Plant, Les Auxons, Bourgogne-Franche-Comté

AUXON MISEREY is a wastewater treatment plant located in Les Auxons, within the Bourgogne-Franche-Comté region of eastern France. The facility serves a population of approximately 5,300 people and has a designed capacity of 5,500 cubic meters per day, with an average discharge volume of 945.51 m³/day. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations of this size (5,300 population equivalent) are required to provide secondary treatment, but the advanced level here indicates a higher standard, likely due to the sensitivity of the receiving environment. The treated effluent is discharged into local watercourses that ultimately drain into the Doubs River, a tributary of the Saône, which flows into the Rhône and eventually the Mediterranean Sea. The plant plays a key role in protecting the water quality of the Doubs basin, supporting aquatic ecosystems and downstream uses.

The plant discharges into the Doubs River basin, which flows through the Jura region and joins the Saône River near Verdun-sur-le-Doubs. The Saône then meets the Rhône at Lyon, which empties into the Mediterranean Sea. The Doubs supports diverse aquatic life, including fish species such as brown trout and grayling, and the river's water quality is important for both ecological health and human activities like fishing and recreation.