Marolles saint vrain 2 Wastewater Treatment Plant, Itteville, France

Marolles saint vrain 2 is a wastewater treatment plant located in Itteville, within the Île-de-France region of France. It serves a population of approximately 22,268 people, classifying it as a medium-sized agglomeration under EU regulations. As a French plant, it operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment for agglomerations of this size. The directive also mandates more stringent treatment if the receiving waters are sensitive areas, such as those prone to eutrophication. The plant discharges treated effluent into the local watershed, which ultimately drains into the Seine River basin. The Seine flows through Paris and into the English Channel, supporting diverse aquatic life and providing water for agriculture and industry. Protecting this waterway is critical for both ecological health and human use.

The plant's treated effluent enters the local water system, which feeds into the Seine River basin. The Seine flows northwest through the Île-de-France region and eventually discharges into the English Channel. This watershed supports a variety of fish species and is an important migratory corridor for birds. Downstream ecosystems benefit from effective nutrient removal to prevent eutrophication in the river and coastal waters.