DANNEMOIS Wastewater Treatment Plant, Dannemois, France

The DANNEMOIS wastewater treatment plant is located in Dannemois, a commune in the Essonne department of Île-de-France, France. It serves a population of approximately 2,666 residents, making it a small-scale facility within the region's wastewater infrastructure. The plant is situated inland, away from coastal areas, and operates under French and European regulations. The plant employs advanced treatment processes, ensuring a high level of pollutant removal before discharge. With a designed capacity of 3,000 cubic meters per day and an average discharge volume of 475.61 cubic meters per day, the facility operates well below its capacity, indicating room for future growth or seasonal variations. As a French plant, it complies with the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations of this size, but the plant exceeds requirements with advanced treatment. The treated effluent is discharged into local watercourses that ultimately drain into the Seine River basin, contributing to the overall water quality of the Seine and its downstream ecosystems. The plant plays a key role in protecting the local environment, including the sensitive aquatic habitats of the Île-de-France region, by reducing nutrient and pollutant loads.

The DANNEMOIS plant discharges into the local watershed that feeds the Seine River, which flows through Paris and into the English Channel. The Seine basin supports diverse aquatic life and is an important ecological corridor. Advanced treatment helps minimize eutrophication risks and protects downstream water quality, particularly in the sensitive estuarine and coastal zones of the English Channel.