Given the ensemble of urban and landscape characters, the objective of the construction of the new Eco Waste-Water Treatment Plant of Saclas is to propose a perfect integration with and within the surrounding environment that is extremely nature-sensitive, by creating a new access to the site through a green hallway, preserving a the non-aligned front next to the Juine, by creating wet and humid zones accompanied by aquatic gardens, and designing an exploitation eco-building opened to the public.