CHATEAUBOURG Wastewater Treatment Plant, Châteaubourg, Brittany

The CHATEAUBOURG wastewater treatment plant is located in Châteaubourg, a commune in the Ille-et-Vilaine department of Brittany, France. It serves a population of approximately 5,140 people and is part of the region's municipal wastewater infrastructure. The plant is situated inland, away from coastal areas, and its operations are integrated into the local water management system. The facility employs advanced treatment processes, ensuring a high level of pollutant removal before discharge. With a designed capacity of 8,000 m³/day and an actual discharge volume of 916.97 m³/day, the plant operates well below its capacity, indicating room for future growth. As a French wastewater facility, it operates under the national regulations transposing the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates appropriate treatment levels based on agglomeration size and receiving water sensitivity. The treated effluent is discharged into local water bodies that eventually drain into the Vilaine River basin and ultimately the Atlantic Ocean. The plant plays a key role in protecting the region's water quality, supporting aquatic ecosystems, and maintaining the ecological balance of the downstream environment. Its advanced treatment helps reduce nutrient loads and other pollutants, contributing to the health of the broader watershed.

The plant discharges into the Vilaine River basin, which flows into the Atlantic Ocean via the Rance estuary. This watershed supports diverse aquatic life and is important for regional biodiversity. The advanced treatment helps minimize nutrient enrichment and protect downstream habitats, including estuarine and coastal zones that are ecologically sensitive.