Montbeliard Sainte Suzanne Wastewater Treatment Plant, Courcelles-lès-Montbéliard, France

The Montbeliard Sainte Suzanne wastewater treatment plant is located in Courcelles-lès-Montbéliard, within the Bourgogne-Franche-Comté region of eastern France. The facility serves a population equivalent of approximately 58,000 people, classifying it as a medium agglomeration under EU regulations. Its location near the Doubs River places it within a sensitive inland watershed. As a French wastewater facility serving over 10,000 population equivalent, the plant is subject to the EU Urban Waste Water Treatment Directive 91/271/EEC. This directive requires secondary treatment as a minimum, with tertiary treatment mandated for discharges into sensitive areas. The regulatory framework ensures compliance with European standards for nutrient removal and effluent quality. The plant discharges treated effluent into the Doubs River, which flows through the Jura region and eventually joins the Saône River, a major tributary of the Rhône. The Rhône drains into the Mediterranean Sea. The Doubs River supports diverse aquatic life and is an important ecological corridor in the region. The plant's operations help protect downstream water quality and biodiversity.

The Montbeliard Sainte Suzanne plant discharges into the Doubs River, a tributary of the Saône River, which flows into the Rhône and ultimately the Mediterranean Sea. The Doubs River supports diverse aquatic ecosystems, including fish species such as grayling and brown trout. The plant's treatment helps maintain water quality in this ecologically sensitive river system, which is also used for recreation and agriculture.