Feldkirchen Westerham Wastewater Treatment Plant, Bad Aibling, Bavaria

The Feldkirchen Westerham wastewater treatment plant is located in Bad Aibling, a town in the district of Rosenheim, Bavaria, Germany. The facility serves a population of approximately 16,000 residents, classifying it as a medium-sized agglomeration under European Union regulations. As a German wastewater treatment plant, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations with a population equivalent between 10,000 and 150,000. The plant's treatment processes are designed to meet these standards, ensuring effective removal of organic matter and nutrients before discharge. The treated effluent from the plant is discharged into a local watercourse that eventually drains into the Inn River, a major tributary of the Danube. The Danube flows into the Black Sea, making this plant part of a vast transboundary river basin. The surrounding region is characterized by alpine foothills and agricultural land, and the plant plays a key role in protecting downstream water quality and aquatic ecosystems.

The plant's discharge enters a local stream that flows into the Mangfall River, a tributary of the Inn River. The Inn River joins the Danube, which ultimately reaches the Black Sea. This watershed supports diverse aquatic life, including fish species such as grayling and brown trout. The plant's treatment helps maintain water quality in this ecologically sensitive alpine river system, which is important for both biodiversity and downstream water users.