Lenningen Oberlenningen Wastewater Treatment Plant, Unterlenningen, Baden-Württemberg

Lenningen Oberlenningen is a wastewater treatment plant located in Unterlenningen, part of the Lenningen municipality in the Esslingen district of Baden-Württemberg, Germany. The plant serves a population of around 6,450 residents, classifying it as a small to medium agglomeration under EU regulations. As a German plant, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The directive also mandates appropriate treatment before discharge into inland waters, ensuring compliance with national water quality standards. The plant's treated effluent is discharged into the local water system, which ultimately drains into the Neckar River basin and then into the Rhine River. The Rhine is a major European waterway supporting diverse aquatic ecosystems and providing drinking water for millions. Proper treatment at this plant helps protect downstream water quality and biodiversity.

The plant discharges into the Neckar River basin, a tributary of the Rhine River. The Rhine is a critical waterway for Europe, supporting diverse fish species and migratory birds. The plant's treatment helps maintain water quality in this ecologically sensitive river system, which flows through densely populated and industrial regions before reaching the North Sea.