VERNEUIL Wastewater Treatment Plant, Vaux-sur-Seine, Île-de-France

The VERNEUIL wastewater treatment plant is located in Vaux-sur-Seine, a commune in the Yvelines department of Île-de-France, France. It serves a population of approximately 20,000 residents, placing it in the medium agglomeration category under EU regulations. The plant is situated near the Seine River, which is the primary watercourse in the region. As a French wastewater facility, VERNEUIL operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment for agglomerations of this size. The directive also mandates more stringent treatment if the discharge enters sensitive areas, such as those prone to eutrophication. The plant's treatment process and capacity are managed to comply with national regulations derived from this directive. The treated effluent from VERNEUIL is discharged into the Seine River, which flows through Paris and eventually into the English Channel. The Seine basin supports diverse aquatic life and is an important ecological corridor. The plant plays a key role in protecting water quality in this densely populated and industrialized region, helping to reduce nutrient loads and maintain the health of the river ecosystem.

The VERNEUIL plant discharges into the Seine River, which flows northwest through Île-de-France and Normandy before reaching 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 downstream uses including drinking water and recreation. The plant's operations help mitigate nutrient pollution and protect the river's ecological balance.