Overview
Villiers-Saint-Frédéric wastewater treatment plant serves approximately 30,000 people in Île-de-France, France. It operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this scale.
The Villiers-Saint-Frédéric wastewater treatment plant is located in the Yvelines department of Île-de-France, France, serving the commune of Villiers-Saint-Frédéric and surrounding areas. With a population equivalent of 30,160, it is classified as a medium-sized agglomeration under French and EU regulations. As a plant in the Île-de-France region, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations between 10,000 and 150,000 population equivalent. The directive also mandates more stringent treatment if the receiving waters are designated as sensitive areas, which is common in the Seine-Normandy basin. The plant discharges treated effluent into the local watershed, which ultimately drains into the Seine River and then into the English Channel. The Seine basin supports diverse aquatic life and is an important ecological corridor in northern France. The plant plays a key role in protecting water quality in this densely populated region.
Environmental context
The plant's treated effluent flows into the Mauldrette stream, a tributary of the Seine River. The Seine River basin is a major hydrological system in northern France, supporting diverse aquatic ecosystems and providing drinking water for millions. Downstream, the Seine estuary and the English Channel receive the river's discharge, making nutrient and pollutant control critical for coastal water quality. The region is ecologically sensitive due to high population density and agricultural runoff.
Frequently asked questions
The plant is located in Villiers-Saint-Frédéric, in the Yvelines department of Île-de-France, France. Its address is Route de Septeuil, La Mauldrette, Villiers-Saint-Frédéric.
The plant serves approximately 30,160 people, classifying it as a medium-sized agglomeration under EU regulations.
Treated effluent from the plant is discharged into the local Mauldrette stream, which flows into the Seine River and eventually reaches the English Channel.
As a French plant, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of its size. French national regulations transpose this directive and are enforced by local authorities.
Under the EU Urban Waste Water Treatment Directive, plants serving between 10,000 and 150,000 population equivalent are required to provide secondary treatment. In sensitive areas, such as parts of the Seine basin, tertiary treatment may be required to reduce nutrients.
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