AUNEUIL 2 Wastewater Treatment Plant, Auneuil, Hauts-de-France

AUNEUIL 2 is an advanced wastewater treatment plant located in Auneuil, within the Oise department of Hauts-de-France, France. The plant serves a population of approximately 2,293 residents and is part of the municipal wastewater infrastructure for the commune. It operates under the French regulatory framework, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this scale. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants, ensuring high-quality effluent. With a designed capacity of 7,300 m³/day and an actual discharge volume of 409.07 m³/day, the facility operates well below its capacity, indicating room for future growth or seasonal variations. 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, supporting diverse aquatic ecosystems and providing water for agriculture and industry. The advanced treatment helps protect downstream water quality and ecological health.

The plant discharges into the local watershed, which is part of the Seine River basin. The Seine flows northward through the Paris region and into the English Channel, supporting a variety of aquatic life and serving as a critical water resource. The advanced treatment level helps minimize nutrient loading and protects downstream ecosystems, including estuarine and coastal habitats.