ST JULIEN DU SAULT Wastewater Treatment Plant, Villevallier, France

ST JULIEN DU SAULT is a wastewater treatment plant located in Villevallier, within the Yonne department of Bourgogne-Franche-Comté, France. The plant serves a population of about 2,533 and has a designed capacity of 3,500 m³/day, with a current discharge volume of 451.88 m³/day. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. This level of treatment typically includes nutrient removal to protect sensitive receiving waters. The treated effluent is discharged into the local watershed, which ultimately drains into the Yonne River, a tributary of the Seine. The Seine River flows through Paris and into the English Channel, supporting diverse aquatic ecosystems and providing water for agricultural and urban uses downstream.

The plant discharges into the Yonne River basin, which feeds into the Seine River and eventually the English Channel. The Seine estuary is an ecologically sensitive area that supports migratory fish species and diverse bird populations. Advanced treatment helps reduce nutrient loading, protecting downstream water quality and aquatic habitats.