IZON Wastewater Treatment Plant, Izon, Nouvelle-Aquitaine, France

The Izon wastewater treatment plant is located in Izon, a commune in the Gironde department of Nouvelle-Aquitaine, southwestern France. The facility serves a population of approximately 3,883 residents and operates with advanced treatment processes, ensuring high-quality effluent before discharge. With a designed capacity of 5,000 m³/day and an average discharge volume of 692.72 m³/day, the plant operates well below its capacity. As a French facility, it complies with national regulations transposing the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates appropriate treatment levels for agglomerations of this size. The plant's treated effluent is discharged into the local watershed, which ultimately drains into the Garonne River and then the Gironde estuary, a major ecological corridor on the Atlantic coast. The estuary supports diverse aquatic life and is an important migratory route for fish species.

The Izon plant discharges into the local water system that flows into the Garonne River, which joins the Dordogne to form the Gironde estuary, the largest estuary in Western Europe. This estuary is ecologically sensitive, supporting diverse aquatic habitats and serving as a critical migratory corridor for Atlantic salmon and European eel. The advanced treatment level helps protect downstream water quality in this dynamic coastal environment.