ROUJAN Wastewater Treatment Plant, Roujan, Occitanie, France

ROUJAN is a wastewater treatment plant located in Roujan, a commune in the Hérault department of Occitanie, southern France. The facility serves a population of approximately 3,100 and is situated inland, more than 10 km from the coast. It operates under the French regulatory framework, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant provides advanced treatment, which goes beyond the secondary treatment standard required by the EU directive for agglomerations of this size. It has a designed capacity of 2,500 m³/day and currently discharges an average of 553 m³/day of treated effluent. The advanced treatment level indicates that the plant likely employs nutrient removal or other tertiary processes to protect sensitive receiving waters. The treated effluent is discharged into local watercourses that drain toward the Mediterranean Sea. The plant plays a key role in protecting the region's water quality, supporting downstream ecosystems, and ensuring compliance with environmental standards for inland waters.

The plant discharges into small streams that flow into the Hérault River, which eventually reaches the Mediterranean Sea near Agde. The watershed supports diverse aquatic life and is important for regional biodiversity. The advanced treatment helps minimize nutrient loading and protects downstream water quality in this sensitive Mediterranean coastal zone.