STEP DE L ENTRE DEUX Wastewater Treatment Plant, Entre-Deux, La Réunion

STEP DE L ENTRE DEUX is a municipal wastewater treatment plant located in Entre-Deux, a commune on the island of La Réunion, an overseas department of France. The plant serves a population of 2,595 and has a designed capacity of 4,500 m³/day, with a current discharge volume of 462.94 m³/day. It operates under French and European Union regulations, which mandate secondary treatment for agglomerations of this size under the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant provides secondary treatment, a standard level for communities in this population range. As part of France's overseas territories, the facility aligns with national water quality standards and EU directives, ensuring treated effluent meets required environmental thresholds before discharge. The plant's capacity utilization is low relative to its design, indicating potential for future growth or seasonal variability. The treated wastewater is discharged into local waterways on La Réunion, an island in the Indian Ocean with unique ecosystems. The plant's operations help protect downstream environments, including rivers and coastal zones, from nutrient pollution and pathogens. Given the island's volcanic terrain and biodiversity, effective wastewater treatment is critical for preserving water quality and supporting both human and ecological health.

The plant discharges into local streams on La Réunion, which flow into the Indian Ocean. The island's watersheds are steep and fast-flowing, supporting diverse aquatic life and sensitive coastal ecosystems. Proper treatment reduces nutrient loading and protects coral reefs and marine habitats downstream.