AZV Donnsberggruppe Sitz Allmannshofen Wastewater Treatment Plant, Holzen, Bavaria

AZV Donnsberggruppe Sitz Allmannshofen is a wastewater treatment plant located in Holzen, within the district of Augsburg in Bavaria, Germany. The plant serves a population of around 5,026 people, classifying it as a small to medium agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). Under the EU UWWTD, agglomerations with a population equivalent (PE) between 2,000 and 10,000 are generally required to have appropriate treatment, typically secondary treatment, unless they discharge into sensitive areas which may require more stringent treatment. It operates within Germany's robust regulatory framework, which implements the UWWTD through national legislation. The plant discharges treated wastewater into local water bodies that ultimately drain into the Danube River basin. The Schmutter River, a tributary of the Danube, flows through the area and likely receives the plant's effluent. The Danube River is a major European waterway that flows into the Black Sea, supporting diverse aquatic ecosystems along its course.

The plant is situated in the catchment of the Schmutter River, a tributary of the Danube River. The Danube flows eastward through several countries before emptying into the Black Sea. This river system supports a wide range of aquatic life, including fish species such as sturgeon and migratory birds. The region's watershed is ecologically sensitive, and proper wastewater treatment is crucial to prevent nutrient pollution and maintain water quality in the Danube basin.