OBERNAI MEISTRATZHEIM Wastewater Treatment Plant, Meistratzheim, Grand Est

OBERNAI MEISTRATZHEIM is a wastewater treatment plant located in Meistratzheim, a commune in the Bas-Rhin department of the Grand Est region, France. The facility serves an estimated population of 121,000, classifying it as a large agglomeration under EU regulations. Its location in the Alsace region places it within the Rhine basin, a major European watershed. As a plant serving over 100,000 people, it falls under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires advanced treatment (tertiary or equivalent) for discharges into sensitive areas. The regulatory framework mandates compliance with stringent effluent standards to protect water quality in the region. The treated effluent from the plant is discharged into local watercourses that ultimately drain into the Rhine River, a major European waterway flowing into the North Sea. The Rhine basin supports diverse aquatic ecosystems and is a critical resource for drinking water, agriculture, and industry. The plant's operation is essential for maintaining the ecological health of the surrounding watershed and downstream environments.

The plant discharges into the Rhine River basin, which flows through Germany and the Netherlands before reaching the North Sea. The Rhine is a vital ecological corridor supporting numerous fish species, including salmon, and provides habitat for migratory birds. The Alsace region's groundwater and surface waters are sensitive to nutrient pollution, making effective wastewater treatment crucial for preventing eutrophication and protecting biodiversity.