COV Cachtice Wastewater Treatment Plant, Čachtice, Slovakia

COV Cachtice is an advanced wastewater treatment plant located in Čachtice, Trenčiansky kraj, western Slovakia. The facility serves a small agglomeration of approximately 1,128 people, reflecting the rural character of the region. As an advanced treatment plant, it goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, which is important for protecting sensitive water bodies. The plant has a designed capacity of 4,300 m³/day and currently discharges about 230.85 m³/day of treated wastewater. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), small agglomerations below 2,000 population equivalent are generally required to provide appropriate treatment, and Slovakia has implemented this through national legislation. The advanced treatment level at COV Cachtice indicates that the receiving environment likely requires nutrient removal to prevent eutrophication. The treated effluent from COV Cachtice ultimately drains into the Váh River basin, which flows into the Danube River and then into the Black Sea. The Váh is the longest river in Slovakia and supports diverse aquatic life, including several fish species. The advanced treatment helps maintain water quality in this important river system.

COV Cachtice discharges into the Váh River basin, a major tributary of the Danube River. The Váh flows through western Slovakia and eventually reaches the Black Sea via the Danube Delta. The region's aquatic ecosystems include fish species such as barbel and chub, and the river supports migratory fish populations. Advanced treatment at this plant helps reduce nutrient loading, which is critical for preventing eutrophication in downstream reservoirs and the Danube Delta.