ROWP CONSILIUL LOCAL Ozun Wastewater Treatment Plant, Lisnău, Covasna County

ROWP CONSILIUL LOCAL Ozun is a municipal wastewater treatment plant located in Lisnău, a village in Ozun commune, Covasna County, Romania. The plant serves a population of approximately 1,842 people, reflecting its role in managing domestic wastewater for this small community in the Transylvanian region. The plant provides secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 1,500 m³/day and a current discharge volume of 103.04 m³/day, the facility operates well below its capacity, indicating potential for future growth or seasonal variations. The treated effluent is discharged into local watercourses that ultimately drain into the Olt River basin, a major tributary of the Danube. The Olt River flows south through Romania to join the Danube, which then reaches the Black Sea. The plant's operation helps protect the local watershed and downstream aquatic ecosystems from untreated pollution.

The plant discharges into the Olt River basin, which flows into the Danube and eventually the Black Sea. The Olt River supports diverse aquatic life and is an important ecological corridor in the Carpathian region. Protecting this watershed from nutrient pollution is critical for maintaining water quality and biodiversity in the downstream Danube Delta ecosystem.