ROCHY CONDE Wastewater Treatment Plant, Rochy-Condé, Hauts-de-France

ROCHY CONDE is an advanced wastewater treatment plant located in Rochy-Condé, a commune in the Oise department of Hauts-de-France, northern France. The plant serves a population of about 2,270, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). It is situated inland, away from coastal areas, and operates within the regulatory framework of French water law, which transposes EU directives. The plant provides advanced treatment, which goes beyond the secondary treatment standard required by the EU UWWTD for agglomerations of this size. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. The designed capacity is 2,200 m³/day, and the current discharge volume is 404.96 m³/day, indicating ample reserve capacity. The plant is part of France's commitment to high environmental standards under the national water management plans (SDAGE). The treated effluent is discharged into local watercourses that ultimately drain into the Seine River basin and the English Channel. The Oise River, a major tributary of the Seine, flows through the region and supports diverse aquatic life. The advanced treatment helps minimize nutrient loading, protecting downstream ecosystems and contributing to the ecological health of the Seine estuary and marine environment.

The plant discharges into local streams that feed the Oise River, a major tributary of the Seine. The Seine River flows through Paris and into the English Channel, supporting a rich ecosystem including migratory fish species. The advanced treatment reduces nutrient pollution, which is critical for preventing eutrophication in the Seine estuary and coastal waters. The region's agricultural landscape also benefits from reduced nitrogen and phosphorus loads.