Heiligenhaus Angertal Wastewater Treatment Plant, Heiligenhaus, Germany

The Heiligenhaus Angertal wastewater treatment plant is located in the Hofermühle area of Heiligenhaus, a town in the Mettmann district of Nordrhein-Westfalen, Germany. The plant serves a population of approximately 52,485, classifying it as a medium-sized agglomeration under EU guidelines. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations of this scale are required to provide at least secondary treatment, with tertiary treatment mandated if the receiving waters are designated as sensitive areas. The regulatory framework ensures compliance with European standards for nutrient removal and effluent quality. The treated effluent is discharged into local watercourses that ultimately drain into the Rhine River basin, a major European watershed. The Rhine supports diverse aquatic ecosystems and is a critical water resource for the region. The plant's operations contribute to protecting the water quality of the Rhine and its tributaries, supporting both ecological health and downstream water uses.

The plant discharges into local streams that flow into the Rhine River, one of Europe's most important waterways. The Rhine basin supports a wide range of aquatic life, including migratory fish species, and is subject to strict water quality standards under the EU Water Framework Directive. The plant's treatment performance directly influences the ecological health of these waters.