LE VAL DES EGLANTIERS Wastewater Treatment Plant, Thiverval-Grignon, France

LE VAL DES EGLANTIERS is a wastewater treatment plant located in Thiverval-Grignon, within the Île-de-France region of France. The facility serves a population of around 38,970, classifying it as a medium-sized agglomeration under European Union standards. Situated in the Yvelines department, the plant is part of the region's extensive water management infrastructure. As a French plant operating under the EU Urban Waste Water Treatment Directive (91/271/EEC), LE VAL DES EGLANTIERS is required to meet secondary treatment standards for its population tier. The directive mandates that agglomerations with a population equivalent (PE) between 10,000 and 150,000 must have secondary treatment, with tertiary treatment in sensitive areas. The plant's location in Île-de-France, a region with numerous sensitive water bodies, may necessitate advanced treatment to protect local waterways. 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 a critical resource for the Paris metropolitan area. Proper treatment at plants like LE VAL DES EGLANTIERS helps maintain water quality in this ecologically and economically important river system.

The plant's treated effluent flows into the local water network, which is part of the Seine River basin. The Seine River traverses Île-de-France before emptying into the English Channel via the Seine estuary. This watershed supports a variety of fish species and is a vital corridor for migratory birds. The region's dense population and agricultural activity place significant pressure on water quality, making effective wastewater treatment essential for preserving the ecological health of the Seine and its downstream marine environment.