ARSAC Wastewater Treatment Plant, Arsac, Nouvelle-Aquitaine, France

The ARSAC wastewater treatment plant is located in Arsac, a commune in the Gironde department of Nouvelle-Aquitaine, southwestern France. The plant serves a population of approximately 2,912 residents and is situated near the Médoc wine region, close to the Atlantic coast. As a secondary treatment facility, ARSAC meets the minimum requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations under 10,000 population equivalent. The plant has a designed capacity of 6,000 cubic meters per day, with an average discharge volume of 519.5 cubic meters per day, indicating ample capacity for current loads. The plant discharges treated wastewater into the local watershed, which ultimately drains into the Gironde estuary and the Bay of Biscay. This coastal proximity necessitates careful management to protect the sensitive marine environment and the region's renowned oyster farming and aquaculture activities.

The ARSAC plant discharges into the Gironde estuary, a major European estuary that flows into the Bay of Biscay (Atlantic Ocean). This estuary supports diverse aquatic life, including migratory fish species such as salmon and eels, and is an important nursery for marine fish. The coastal location requires treatment to prevent nutrient enrichment and protect the region's shellfish industry.