COV Zvolen Wastewater Treatment Plant, Zvolen, Slovakia

COV Zvolen is a municipal wastewater treatment facility located in Zvolen, within the Banskobystrický kraj region of central Slovakia. The plant serves an estimated population of 55,088, placing it in the medium-to-large agglomeration category under EU classification. As a facility operating within the European Union, COV Zvolen is subject to 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. The plant discharges treated effluent into the local watershed, which ultimately drains into the Hron River, a major tributary of the Danube. The Danube River flows into the Black Sea, making this plant part of a large international river basin that supports diverse aquatic ecosystems and provides water for millions of people downstream.

COV Zvolen discharges into the Hron River basin, which flows into the Danube River and eventually reaches the Black Sea. The Hron River supports diverse aquatic life, including fish species such as barbel and chub, and provides habitat for migratory birds along its course. The Danube River is a critical ecological corridor for many species across Europe, and the plant's treatment performance directly affects water quality in this internationally significant river system.