Saint-Drézéry Wastewater Treatment Plant - Occitanie, France

The Saint-Drézéry wastewater treatment plant is located in the commune of Saint-Drézéry, within the Hérault department of the Occitanie region in southern France. The facility serves a population of approximately 2,900 residents and is part of the municipal wastewater infrastructure managed by the local authority. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 4,000 m³/day and an average daily discharge of 517.35 m³/day, the plant operates well within its capacity, ensuring effective treatment of wastewater. The treated effluent is discharged into the local watershed, which ultimately drains into the Mediterranean Sea. The plant plays a key role in protecting the region's water quality, particularly the sensitive coastal and marine environments of the Gulf of Lion. Advanced treatment helps reduce nutrient loads and pollutants, supporting the ecological health of downstream water bodies.

The plant discharges into the local drainage network that flows into the Hérault River and eventually reaches the Mediterranean Sea near the Gulf of Lion. This coastal region supports diverse marine life and is an important area for fisheries and tourism. Advanced treatment at the plant helps minimize nutrient pollution and protects the sensitive coastal ecosystem from eutrophication and other impacts.