QUISSAC Wastewater Treatment Plant, Quissac, Occitanie, France

The QUISSAC wastewater treatment plant is located in Quissac, a commune in the Gard department of Occitanie, southern France. It serves a population of approximately 2,237 people, placing it in the small agglomeration category under French regulations. The plant is situated inland, more than 10 km from the coast, and operates under the national regulatory framework derived from the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU directive for agglomerations of this size. Its design capacity is 3,500 m³/day, and it currently discharges 399.08 m³/day, indicating significant spare capacity. The facility is part of France's commitment to protecting water quality in sensitive areas, where advanced treatment is mandated to reduce nutrient loads. The treated effluent is discharged into local watercourses that ultimately drain into the Mediterranean Sea via the Vidourle River and the Gulf of Lion. The plant plays a key role in safeguarding the ecological health of the region's rivers and coastal waters, supporting biodiversity and recreational uses downstream.

The plant discharges into the Vidourle River basin, which flows into the Mediterranean Sea near the Gulf of Lion. This coastal zone supports diverse marine life and is important for fisheries and tourism. Advanced treatment helps reduce nutrient pollution, protecting seagrass meadows and fish habitats from eutrophication.