COV Sastin Wastewater Treatment Plant, Šaštín, Slovakia

COV Sastin is a municipal wastewater treatment plant located in Šaštín, part of the Šaštín-Stráže municipality in Trnavský kraj, western Slovakia. The plant serves a population of about 1,100 people, placing it in the small agglomeration category under EU regulations. The facility provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for discharges into freshwater bodies from agglomerations of this size. The plant has a designed capacity of 7,200 m³/day, with an average daily discharge volume of approximately 226 m³, indicating significant reserve capacity. The treated effluent is discharged into local watercourses that drain into the Morava River basin, eventually reaching the Danube River and the Black Sea. The plant plays a key role in protecting the region's surface water quality and supporting the ecological health of the downstream aquatic environment.

The plant discharges into small streams within the Morava River basin, which flows into the Danube River and ultimately the Black Sea. This watershed supports diverse aquatic life and is important for regional biodiversity. The secondary treatment helps reduce organic pollution and nutrient loads, protecting downstream ecosystems from eutrophication.