COV Marcelova Wastewater Treatment Plant, Marcelová, Slovakia

COV Marcelova is a municipal wastewater treatment plant located in Marcelová, a village in the Nitriansky kraj region of southwestern Slovakia. The plant serves a population of around 1,572, placing it in the small agglomeration category under EU regulations. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. With a designed capacity of 2,000 m³/day and a discharge volume of 321.72 m³/day, the facility operates well below its capacity, indicating potential for future growth. The treated effluent is discharged into local waterways that ultimately drain into the Danube River basin, a major European river system flowing into the Black Sea. The plant plays a key role in protecting local water quality and supporting the ecological health of the region's aquatic environments.

The plant discharges into the Danube River basin, which flows through central and eastern Europe before reaching the Black Sea. The local watershed supports diverse aquatic life and is part of an important migratory corridor for fish species. Protecting water quality in this basin is critical for downstream ecosystems and human uses.