Les Matelles Wastewater Treatment Plant - Occitanie, France

The Les Matelles wastewater treatment plant is located in the commune of Les Matelles, within the Hérault department of Occitanie, southern France. This facility serves a population of approximately 1,700 residents, reflecting its role as a small municipal plant in a rural setting. The plant employs advanced treatment processes, ensuring a high level of effluent quality. With a designed capacity of 2,500 m³/day and an average discharge volume of 303.28 m³/day, the plant operates well below its capacity, indicating room for future growth. As a French facility, it operates under national regulations transposing the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment for small agglomerations. The treated effluent is discharged into the local watershed, which ultimately drains into the Mediterranean Sea via the Hérault River system. The plant's advanced treatment helps protect downstream aquatic ecosystems and supports the ecological health of the region's water bodies.

The plant discharges into the Hérault River basin, which flows into the Mediterranean Sea near Sète. This coastal watershed supports diverse aquatic life, including fish species such as the European eel, and provides habitat for migratory birds. The advanced treatment level helps minimize nutrient loading and protects the sensitive marine environment of the Gulf of Lion.