ETAIN Wastewater Treatment Plant, Étain, Grand Est, France

The ETAIN wastewater treatment plant is located in Étain, a commune in the Meuse department of the Grand Est region, France. It serves a population of approximately 2,910 residents, providing secondary treatment as part of the municipal wastewater infrastructure. The plant's designed capacity is 5,000 m³/day, with an average discharge volume of 519.14 m³/day. As a secondary treatment facility, ETAIN meets the requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The directive mandates secondary treatment for populations between 2,000 and 10,000, which aligns with the plant's service population. The plant operates under French national regulations that transpose the directive, ensuring compliance with effluent standards. The treated wastewater is discharged into local watercourses that drain into the Orne River, a tributary of the Moselle, which ultimately flows into the Rhine River and the North Sea. The plant plays a key role in protecting the local watershed from nutrient pollution and organic matter, supporting aquatic life in the downstream river systems.

The ETAIN plant discharges into the Orne River basin, which flows through the Grand Est region before joining the Moselle River. The Moselle is a major tributary of the Rhine, one of Europe's most important waterways, ultimately reaching the North Sea. The local watershed supports diverse aquatic ecosystems, including fish species such as brown trout and grayling, and is an important corridor for migratory birds. The plant's secondary treatment helps reduce nutrient loads that could otherwise contribute to eutrophication in downstream water bodies.