SAINT GEORGES DES GROSEILLERS Wastewater Treatment Plant, Montilly-sur-Noireau, Normandy

SAINT GEORGES DES GROSEILLERS is an advanced wastewater treatment plant located in Montilly-sur-Noireau, within the Orne department of Normandy, France. The facility serves a population of approximately 1,558 people and is designed to handle a capacity of 2,500 m³ per day, with a current discharge volume of 277.94 m³/day. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. As a French facility, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates appropriate treatment levels based on the sensitivity of receiving waters. For small agglomerations like this, advanced treatment is often required in sensitive areas to protect water quality. The treated effluent is discharged into the local watershed, which ultimately drains into the Atlantic Ocean via the Orne River and the English Channel. The plant plays a key role in protecting the Noireau River and downstream aquatic ecosystems from nutrient pollution and organic load, supporting biodiversity and water quality in the region.

The plant discharges into the Noireau River, a tributary of the Orne River, which flows into the English Channel near Ouistreham. The watershed supports diverse aquatic life and is part of a region with agricultural and rural land use. Advanced treatment helps reduce nutrient loading, protecting downstream estuarine and coastal environments from eutrophication.