Doudeville Wastewater Treatment Plant, Normandy, France

The Doudeville wastewater treatment plant is located in the commune of Doudeville, in the Seine-Maritime department of Normandy, France. It serves a population of approximately 3,100 people, classifying it as a small agglomeration under French and EU regulations. The plant is situated inland, more than 10 kilometers from the coast, and its treated effluent contributes to the local water cycle. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 3,700 cubic meters per day and an average daily discharge of 553 cubic meters, the facility operates well within its capacity, indicating effective management of local wastewater flows. The treated water is discharged into the local watershed, which ultimately drains into the English Channel via the Seine River basin. The advanced treatment level helps protect downstream aquatic ecosystems and supports the ecological health of the region's rivers and coastal waters. Normandy's water bodies are important for biodiversity and recreational use, making the plant's role in pollution control significant.

The plant discharges into the Seine River basin, which flows through Normandy and into the English Channel. This watershed supports diverse aquatic life and is an important ecological corridor for migratory fish species. The advanced treatment helps minimize nutrient and pollutant loads, protecting downstream water quality in both freshwater and coastal environments.