Mattig Hainbach Wastewater Treatment Plant, Schalchen, Oberösterreich

Mattig Hainbach is a wastewater treatment plant located in Schalchen, Oberösterreich, Austria. It serves a population equivalent of 27,222, classifying it as a medium agglomeration under EU regulations. The plant is situated inland, away from coastal areas, and its operations are part of the regional wastewater infrastructure in the Bezirk Braunau district. As an Austrian plant, Mattig Hainbach is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The directive also mandates more advanced treatment if the receiving waters are sensitive to eutrophication. The plant's treatment processes are designed to meet these standards, ensuring compliance with national and European environmental regulations. The treated effluent from Mattig Hainbach is discharged into local water bodies that ultimately drain into the Danube River basin. The Danube is a major European river that flows into the Black Sea, supporting diverse aquatic ecosystems. The plant plays a key role in protecting water quality in the region, reducing nutrient loads and organic pollution before discharge.

Mattig Hainbach discharges into the local watershed, which is part of the Danube River basin. The Danube flows through multiple countries before reaching the Black Sea, supporting a rich diversity of fish and bird species. The plant's location in Oberösterreich places it in a region where water quality is critical for downstream ecosystems, including wetlands and floodplain forests that rely on clean water.