StPeter am Ottersbach Wastewater Treatment Plant, Sankt Peter am Ottersbach, Austria

StPeter am Ottersbach is an advanced wastewater treatment plant located in Sankt Peter am Ottersbach, a municipality in the district of Südoststeiermark, Steiermark, Austria. The plant serves a population of 1,155 and is part of the region's municipal wastewater infrastructure. The plant provides advanced treatment, which goes beyond secondary treatment to remove nutrients and other pollutants. As an Austrian plant, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates appropriate treatment levels based on the size of the agglomeration and the sensitivity of the receiving environment. The treated effluent is discharged into local watercourses that drain into the Mur River basin, ultimately flowing into the Danube River and the Black Sea. The plant plays a key role in protecting the region's water quality and supporting the ecological health of downstream aquatic habitats.

The plant discharges into small streams that feed into the Mur River, a major tributary of the Danube. The Mur River supports diverse aquatic life and is an important corridor for fish migration. The Danube basin is a vast ecological system that ultimately drains into the Black Sea, making nutrient removal at plants like StPeter am Ottersbach critical for preventing eutrophication in downstream waters.