CARCANS BOURG Wastewater Treatment Plant, Carcans, Nouvelle-Aquitaine

CARCANS BOURG is a municipal wastewater treatment plant located in Carcans, a commune in the Gironde department of Nouvelle-Aquitaine, southwestern France. The plant serves a population of 1,136 and is situated near the Atlantic coast, within the Médoc region. It operates under the French regulatory framework, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this scale. The plant provides secondary treatment, a standard level for small agglomerations under the EU directive, which requires biological treatment to reduce organic matter and suspended solids. With a designed capacity of 2,000 m³/day and a current discharge volume of 202.66 m³/day, the plant operates well below its capacity, indicating potential for future growth or seasonal variability. Secondary treatment typically involves activated sludge or similar biological processes. The treated effluent is discharged into the local watershed, which ultimately drains into the Atlantic Ocean via the Garonne estuary and the Gironde estuary, a major European estuary. The plant's proximity to the coast (within 10 km) means its discharge can influence coastal water quality, particularly in the sensitive dune and lake ecosystems of the Médoc region. The area supports diverse aquatic life and is important for migratory birds and fish species.

The plant discharges into the local watershed that flows into the Gironde estuary, a large estuary on the Atlantic coast of France. The estuary is ecologically sensitive, supporting diverse aquatic life including migratory fish like salmon and eels. The nearby coastal zone includes the Lac d'Hourtin-Carcans, a large freshwater lake, and the Atlantic dune system, which are important for biodiversity and tourism. The plant's secondary treatment helps protect these downstream environments from nutrient pollution and organic matter.