COV Nitrianske Rudno Wastewater Treatment Plant, Nitrianske Rudno, Slovakia

COV Nitrianske Rudno is a wastewater treatment plant located in Nitrianske Rudno, a village in the Prievidza district of the Trenčiansky kraj region in western Slovakia. The plant was part of the municipal wastewater infrastructure for the local population. The plant provided secondary treatment, which is the standard biological treatment stage required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this scale. The directive mandates secondary treatment for discharges into freshwater and estuaries, ensuring reduction of organic matter and suspended solids. The treated effluent from the plant would have been discharged into local water bodies, ultimately contributing to the Váh River basin, which flows into the Danube River and then to the Black Sea. The plant's operation helped protect the local aquatic environment from untreated wastewater pollution.

The plant is situated inland in the Váh River basin, a major tributary of the Danube. The Váh River supports diverse aquatic life and is an important ecological corridor in the Carpathian region. Downstream, the Danube River flows into the Black Sea, making the treatment of wastewater in this basin critical for protecting both local and transboundary water quality.