QUILLAN CHEF LIEU Wastewater Treatment Plant, Quillan, Occitanie

QUILLAN CHEF LIEU is a municipal wastewater treatment plant located in Quillan, a commune in the Aude department of Occitanie, southern France. The plant serves a population of around 8,068 people, placing it in the small-to-medium agglomeration category under EU classification. As a French facility, the plant operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The directive also mandates more advanced treatment if the receiving waters are designated as sensitive areas. The plant's treatment process and capacity details are not publicly available, but compliance with national regulations ensures appropriate treatment standards. The treated effluent is discharged into the local watershed, which ultimately drains into the Aude River and then to the Mediterranean Sea. The plant plays a key role in protecting the water quality of the Aude River and the downstream coastal environment, supporting aquatic life and recreational uses.

The plant discharges into the Aude River basin, which flows through the Corbières region before reaching the Mediterranean Sea near Narbonne. The river supports diverse aquatic ecosystems and is important for local agriculture and tourism. Downstream, the coastal zone includes sensitive marine habitats that benefit from effective wastewater treatment.