Horgertshausen Wastewater Treatment Plant, Hörgertshausen, Bavaria

The Horgertshausen wastewater treatment plant is located in the municipality of Hörgertshausen, in the district of Freising, Bavaria, Germany. It serves a population of approximately 2,158 residents, providing secondary treatment to meet German and EU water quality standards. The plant's designed capacity is 3,000 cubic meters per day, with an average discharge volume of 634.17 m³/day. As a secondary treatment facility, the plant employs biological processes to reduce organic matter and suspended solids. It operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The plant's performance is regulated by German water laws, ensuring compliance with discharge limits. The treated effluent is discharged into local streams that eventually drain into the Isar River, a major tributary of the Danube. The Isar flows through Munich and into the Danube, which ultimately reaches the Black Sea. The plant plays a key role in protecting the local watershed and downstream ecosystems from nutrient pollution.

The plant discharges into small watercourses that feed into the Isar River, which flows through Bavaria and joins the Danube near Deggendorf. The Danube then travels through several countries before emptying into the Black Sea. The local watershed supports diverse aquatic life, including fish species such as brown trout and grayling. The plant's secondary treatment helps reduce organic load and nutrient inputs, protecting downstream water quality in the Isar and Danube basins.