Le Mesnil-Amelot Wastewater Treatment Plant - Île-de-France, France

Le Mesnil-Amelot wastewater treatment plant is located in the Île-de-France region, serving the commune of Le Mesnil-Amelot and surrounding areas. With a population equivalent of approximately 10,291, it is classified as a medium agglomeration under French and EU regulations. The plant is situated inland, over 50 km from the coast, and discharges into local watercourses that ultimately drain into the Seine River basin. As a facility serving a medium-sized agglomeration, the plant is required to meet secondary treatment standards under the EU Urban Waste Water Treatment Directive (91/271/EEC). This directive mandates biological treatment for all agglomerations above 2,000 population equivalent, with more stringent requirements for sensitive areas. The plant's design and operational practices align with these regulatory frameworks, ensuring effective removal of organic matter and nutrients. The treated effluent from the plant is discharged into the local hydrological network, which flows into the Seine River and eventually reaches the English Channel. The Seine basin supports diverse aquatic ecosystems and is a critical water resource for the Paris metropolitan area. The plant plays a key role in protecting downstream water quality and maintaining the ecological health of the Seine estuary and coastal waters.

The plant discharges into the Seine River basin, which drains into the English Channel via the Seine estuary. The Seine supports a variety of aquatic life and is an important migratory corridor for fish species such as Atlantic salmon and European eel. The estuary and coastal waters are ecologically sensitive areas that benefit from reduced nutrient loads from upstream treatment facilities.