Corbeil Essonnes Wastewater Treatment Plant, Évry, France

The Corbeil Essonnes wastewater treatment plant is located in Évry, in the Essonne department of Île-de-France, France. It serves a population of approximately 87,459 people, classifying it as a medium-to-large agglomeration under EU classification. The plant is situated near the Seine River basin, which ultimately drains into the English Channel. As a 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 biological treatment as a minimum, and for sensitive areas, tertiary treatment may be mandated. The plant's treatment processes are expected to meet these standards to protect the receiving water environment. The treated effluent from the plant is discharged into the Seine River system, which flows through Paris and into the English Channel. The Seine basin supports diverse aquatic life and is an important ecological corridor. The plant plays a key role in maintaining water quality in this densely populated and industrialized region.

The plant discharges into the Seine River, which flows through the Paris metropolitan area and eventually reaches the English Channel. The Seine basin is a major ecological corridor supporting fish species such as salmon and eel, and its water quality is critical for both aquatic life and downstream uses including drinking water and recreation. The plant's treatment performance directly affects the health of this river system.