ROWP RAJA Negru Voda Wastewater Treatment Plant, Negru Vodă, Constanța, Romania

ROWP RAJA Negru Voda is a municipal wastewater treatment plant located in Negru Vodă, Constanța County, Romania. The facility serves a population of approximately 2,500 residents, classifying it as a small agglomeration under Romanian and 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 6,480 m³/day and a current discharge volume of 150.44 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variability. The treated effluent is discharged into the local watershed, which ultimately drains into the Black Sea via the Danube River system or coastal streams. The plant plays a key role in protecting downstream water quality and supporting the ecological health of the region's aquatic environments.

The plant discharges into the local watershed near the Black Sea coast, within 50 km of the shoreline. The receiving waters eventually flow into the Black Sea, a semi-enclosed sea with limited water exchange and high ecological sensitivity. Protecting this coastal environment from nutrient pollution is critical to prevent eutrophication and maintain biodiversity in the region's marine and coastal ecosystems.