ARA Gross Siegharts 1480 WT Wastewater Treatment Plant, Sieghartsles, Austria

ARA Gross Siegharts 1480 WT is a municipal wastewater treatment plant located in Sieghartsles, a locality within the municipality of Groß-Siegharts in the Bezirk Waidhofen an der Thaya, Niederösterreich, Austria. The plant serves a population of approximately 7,117 people, classifying it as a small to medium agglomeration under EU classification. As an Austrian facility, the plant 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 more advanced treatment if the receiving waters are designated as sensitive areas. It is expected to meet the regulatory standards for its population tier. The plant discharges treated wastewater into the local water system, which ultimately drains into the Thaya River, a tributary of the Dyje River that flows into the Morava River and then the Danube. This connection to the Danube basin means the plant's operations contribute to the water quality of a major European river system, supporting downstream ecosystems and biodiversity.

The plant's treated effluent enters the Thaya River, which flows through the Waldviertel region of Austria before crossing into the Czech Republic as the Dyje River. The Dyje joins the Morava River, a major tributary of the Danube. This river network supports diverse aquatic life and provides habitat for species such as the European otter and various fish. The Thaya River valley is also an important migratory corridor for birds. The plant's discharge must meet quality standards to protect these downstream ecosystems.