ZV Mittleres Illertal Sitz Illertissen Wastewater Treatment Plant, Illertissen, Bavaria

ZV Mittleres Illertal Sitz Illertissen is a wastewater treatment plant located in Illertissen, in the Bavarian district of Neu-Ulm, Germany. The plant serves a population of around 50,000, classifying it as a medium-to-large agglomeration under EU regulations. As a German facility, the plant is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. Depending on the sensitivity of the receiving waters, tertiary treatment may also be mandated to reduce nutrient loads. The plant discharges treated effluent into the local water system, which ultimately drains into the Danube River via the Iller River. The Danube basin supports diverse aquatic ecosystems and is an important migratory corridor for fish species. The plant's operation helps protect downstream water quality in this ecologically significant river system.

The plant's treated effluent flows into the Iller River, a tributary of the Danube. The Danube River basin is one of Europe's most important waterways, supporting diverse aquatic life and serving as a key migratory route for fish. The plant's nutrient removal performance is critical to preventing eutrophication in downstream lakes and the Black Sea.