Bourdonné Wastewater Treatment Plant, Île-de-France, France

The Bourdonné wastewater treatment plant is located in the commune of Bourdonné, in the Yvelines department of Île-de-France, France. It serves a population of approximately 2,079, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The plant is situated in a rural area near the D 61 road. The plant employs advanced treatment, which goes beyond the secondary treatment typically required for agglomerations of this size under the EU UWWTD. Advanced treatment often includes nutrient removal (nitrogen and phosphorus) to protect sensitive water bodies. The plant has a designed capacity of 2,000 m³/day and currently discharges 370.89 m³/day, indicating significant spare capacity. The treated effluent is discharged into local watercourses that ultimately drain into the Seine River basin. The Seine flows through Paris and into the English Channel. The plant's advanced treatment helps protect the Seine's water quality and downstream ecosystems, including the Seine estuary and marine environment.

The plant discharges into the Seine River basin, which flows through Île-de-France and into the English Channel. The Seine supports diverse aquatic life and is an important ecological corridor. Advanced treatment at this plant reduces nutrient loads, helping to prevent eutrophication in downstream waters and the coastal zone.