Walpertskirchen Wastewater Treatment Plant, Bavaria, Germany

Walpertskirchen wastewater treatment plant is located in the municipality of Walpertskirchen in the district of Erding, Bavaria, Germany. The plant served a population of 1,766 people and was designed with a capacity of 2,200 m³/day. It is now closed. As a secondary treatment facility, the plant provided biological treatment to reduce organic matter and suspended solids. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations with a population equivalent (PE) between 2,000 and 10,000 are required to have appropriate treatment, typically secondary treatment. Walpertskirchen, serving 1,766 people, falls below this threshold and thus was not subject to the directive's mandatory secondary treatment requirements, though it still provided secondary treatment. The plant's treated effluent was discharged into local watercourses that eventually drain into the Isar River, a major tributary of the Danube. The Danube flows into the Black Sea. The plant's operation contributed to protecting the local aquatic environment and downstream ecosystems.

The plant discharged into local streams that flow into the Isar River, which joins the Danube and ultimately reaches the Black Sea. The Isar is an ecologically important river supporting diverse aquatic life, including fish species such as grayling and brown trout. The plant's secondary treatment helped reduce nutrient and organic pollution, safeguarding water quality in this sensitive river system.