STEP de Captieux - Advanced Wastewater Treatment Plant in Captieux, Nouvelle-Aquitaine

STEP de Captieux is a wastewater treatment facility located in Captieux, a commune in the Gironde department of Nouvelle-Aquitaine, southwestern France. The plant serves a population of approximately 1,176 residents and is designed to handle a capacity of 2,500 cubic meters per day, with a current discharge volume of 209.80 m³/day. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. As a facility in France, it operates under the European Union's Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment levels based on the sensitivity of receiving waters. For small agglomerations like Captieux, advanced treatment ensures compliance with stringent environmental standards. The treated effluent is discharged into local waterways, contributing to the protection of the Garonne River basin and the broader Atlantic coastal ecosystem. The plant's advanced treatment helps safeguard water quality in the region, supporting aquatic life and downstream uses such as agriculture and recreation.

The plant discharges into the local watershed, which is part of the Garonne River basin. The Garonne flows through southwestern France and eventually reaches the Gironde estuary and the Atlantic Ocean. This region supports diverse aquatic habitats and is important for migratory fish species. The advanced treatment at STEP de Captieux helps minimize nutrient loading and protects the ecological health of downstream waters.