SAINT JUST SAINT NAZAIRE DE PEZAN Wastewater Treatment Plant, Saint-Just, Occitanie

SAINT JUST SAINT NAZAIRE DE PEZAN is a municipal wastewater treatment plant located in Saint-Just, within the Hérault department of Occitanie, southern France. The plant serves a population of approximately 3,100 residents and is situated near the Mediterranean coast, reflecting the region's mix of agricultural and peri-urban communities. The plant provides secondary treatment, which is the minimum standard required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 5,000 m³/day and a current discharge volume of 553.03 m³/day, the facility operates well below its capacity, indicating room for future growth or seasonal demand. The plant's coastal proximity subjects it to stringent regulatory oversight to protect sensitive marine environments. Treated effluent from the plant is discharged into local watercourses that eventually drain into the Mediterranean Sea. The coastal zone supports diverse marine habitats, including seagrass meadows and nursery areas for fish, making effective nutrient and pathogen removal critical. The plant plays a key role in safeguarding water quality in the Gulf of Lion, a region known for its ecological and economic importance.

The plant discharges into the coastal watershed of the Gulf of Lion, part of the northwestern Mediterranean Sea. This area supports ecologically sensitive marine habitats, including seagrass beds and fish spawning grounds, which are vulnerable to nutrient enrichment and pollution. Effective secondary treatment helps mitigate eutrophication risks and protects downstream biodiversity in this semi-enclosed sea.