FERRIERES Wastewater Treatment Plant, Fontenay-sur-Loing, Centre-Val de Loire

FERRIERES is a wastewater treatment plant located in Fontenay-sur-Loing, within the Centre-Val de Loire region of France. It serves a population of approximately 5,446 people, placing it in the small to medium agglomeration category under French regulations. The plant is situated inland, away from coastal areas, and its operations are part of the municipal infrastructure for the Loiret department. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 5,500 m³/day and an average discharge volume of 971.56 m³/day, the facility operates well within its capacity, indicating efficient management. French wastewater treatment plants are regulated by the national water law (Loi sur l'eau) and must comply with discharge permits issued by the local prefecture. The treated effluent is discharged into the local watershed, which ultimately drains into the Loing River, a tributary of the Seine. The Seine basin supports diverse aquatic life and is an important ecological corridor in northern France. The advanced treatment helps protect downstream water quality, particularly in the sensitive Seine estuary and the English Channel.

The plant discharges into the Loing River basin, which flows into the Seine River and eventually reaches the English Channel. The Seine watershed is a major ecological and economic resource, supporting fisheries, agriculture, and biodiversity. Advanced treatment at this plant reduces nutrient loads, helping to prevent eutrophication in downstream waters and protecting the sensitive marine environment of the Channel.