Buchy Wastewater Treatment Plant, Normandie, France

The Buchy wastewater treatment plant is located in the commune of Buchy, within the Seine-Maritime department of Normandie, France. It serves a population of approximately 2,300 people, classifying it as a small agglomeration under French and EU regulations. The plant employs advanced treatment processes, exceeding the EU Urban Waste Water Treatment Directive's minimum requirement of secondary treatment for this population tier. With a designed capacity of 2,800 m³/day and an average discharge volume of 410.32 m³/day, the facility operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into the local watershed, which ultimately drains into the Seine River basin and then into the English Channel. The plant's advanced treatment helps protect downstream aquatic ecosystems and supports the ecological health of the Seine estuary and coastal waters.

The plant discharges into the Seine River basin, which flows through Normandie into the English Channel. The Seine estuary is an ecologically sensitive area supporting diverse aquatic life, including migratory fish species. Advanced treatment at Buchy reduces nutrient loads, helping to mitigate eutrophication risks in downstream coastal waters.