Erdweg Wastewater Treatment Plant, Petersberg, Bayern

The Erdweg wastewater treatment plant is located in Petersberg, a district of Erdweg in the Landkreis Dachau, Bayern, Germany. The facility serves a population of approximately 4,941, classifying it as a small agglomeration under EU regulations. As a German wastewater treatment plant, Erdweg operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The directive also mandates appropriate treatment before discharge into inland waters, ensuring compliance with national standards set by the German Water Resources Act (Wasserhaushaltsgesetz). The plant's treated effluent is discharged into local water bodies within the Danube river basin, which ultimately drains into the Black Sea. The facility plays a role in protecting the region's aquatic ecosystems, including the Amper River and its tributaries, which support diverse freshwater life and are important for local biodiversity.

The Erdweg plant discharges into the local watershed within the Danube basin, which flows through Bavaria and eventually reaches the Black Sea. The receiving waters include small streams that feed into the Amper River, a tributary of the Isar. This region supports aquatic habitats for fish species such as brown trout and grayling, and the plant's treatment helps maintain water quality in these ecologically sensitive waterways.