Hagelstadt Wastewater Treatment Plant, Gailsbach, Bavaria

The Hagelstadt wastewater treatment plant is located in the Gailsbach district of Hagelstadt, in the Landkreis Regensburg, Bavaria, Germany. It served a population of 1,742 people and is now closed. The plant provided secondary treatment, which is the standard level required under the EU Urban Waste Water Treatment Directive for agglomerations of this size. With a designed capacity of 3,000 m³/day and an average discharge volume of 440.86 m³/day, the plant operated well below its capacity. As a closed facility, its treatment processes are no longer active, but the infrastructure remains part of the local wastewater history. The plant's treated effluent was discharged into local water bodies that drain into the Danube River basin, ultimately reaching the Black Sea. The surrounding region is characterized by agricultural land and small settlements, and the plant's operation contributed to protecting local streams and groundwater quality.

The plant discharged into small streams within the Danube River basin, which flows into the Black Sea. The local watershed supports agricultural activities and diverse aquatic life. The plant's secondary treatment helped reduce organic pollutants and nutrients, protecting downstream ecosystems from eutrophication and maintaining water quality for the sensitive Danube delta region.