StMargarethen an der Raab Wastewater Treatment Plant, Styria, Austria

StMargarethen an der Raab wastewater treatment plant is located in the municipality of St. Margarethen an der Raab in the district of Weiz, Styria, Austria. The plant serves a population of 4,012 and is classified as a small agglomeration under the EU Urban Waste Water Treatment Directive. The plant provides advanced treatment, which goes beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive for agglomerations of this size. Its designed capacity is 5,200 m³/day, with an actual discharge volume of 579.73 m³/day, indicating significant spare capacity. The treated effluent is discharged into local watercourses that drain into the Raab River, a tributary of the Danube. The plant plays a key role in protecting the water quality of the Raab basin and ultimately the Danube ecosystem, supporting aquatic life and downstream water uses.

The plant discharges into the Raab River basin, which flows into the Danube River and eventually the Black Sea. The Raab River supports diverse aquatic habitats and is important for regional biodiversity. Advanced treatment helps minimize nutrient and pollutant loads, protecting downstream ecosystems from eutrophication and contamination.