Le Grand Quevilly Wastewater Treatment Plant - Normandy, France

Le Grand Quevilly wastewater treatment plant is located in Le Grand-Quevilly, a commune in the Seine-Maritime department of Normandy, France. The facility serves a population of approximately 59,000, placing it within the medium agglomeration category under EU regulations. Its location near the Seine River makes it a key component of the regional wastewater infrastructure. As a French plant serving over 10,000 people, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment as a minimum. For agglomerations of this size in sensitive areas, tertiary treatment may be mandated to reduce nutrient loads. The regulatory framework ensures compliance with national and EU standards. The plant's treated effluent ultimately reaches the Seine River, which flows through Rouen and into the English Channel. The Seine estuary is an ecologically important area supporting diverse aquatic life and migratory fish species. The plant's operations contribute to protecting downstream water quality and the broader marine environment.

The plant discharges into the Seine River basin, which drains into the English Channel via the Seine estuary. The estuary is a critical habitat for fish like salmon and eel, and supports rich birdlife. Nutrient management is important to prevent eutrophication in the coastal zone. The plant's location in an industrial and urban area requires robust treatment to protect the river and downstream ecosystems.