PORTES en RE Wastewater Treatment Plant, Les Portes-en-Ré, Nouvelle-Aquitaine

PORTES en RE is a wastewater treatment plant located in Les Portes-en-Ré, on the Île de Ré in the Nouvelle-Aquitaine region of France. The plant serves a population of approximately 5,703 residents and is situated near the Atlantic coast, within 50 km of the shoreline. As part of the municipal infrastructure, it manages wastewater from the northern part of the island. The plant has a designed capacity of 1.00 (likely in thousands of cubic meters per day or population equivalent). Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations of this size (5,000-10,000 PE) are required to provide secondary treatment or equivalent. The directive also mandates more stringent treatment if the discharge enters sensitive areas, which may apply given the coastal location. The treated effluent from PORTES en RE is discharged into the local environment, ultimately reaching the Atlantic Ocean. The Île de Ré is part of the Pertuis d'Antioche strait, a marine area known for its biodiversity and shellfish farming. The plant plays a key role in protecting the coastal waters and marine ecosystems from nutrient pollution and pathogens.

The plant discharges into the coastal waters of the Île de Ré, which are part of the Pertuis d'Antioche, a marine area connecting to the Bay of Biscay and the Atlantic Ocean. This region supports diverse marine life, including shellfish beds and migratory fish species. The proximity to the coast and sensitive marine habitats necessitates effective treatment to prevent eutrophication and protect water quality.