ROWP Cluj Napoca Wastewater Treatment Plant - Cluj-Napoca, Romania

ROWP Cluj Napoca is a municipal wastewater treatment plant serving the city of Cluj-Napoca, one of Romania's largest urban centers. With a population equivalent of approximately 372,549, it ranks as a large agglomeration under EU classification, requiring advanced treatment to protect receiving waters. As a plant in an EU member state, ROWP Cluj Napoca is subject to the Urban Waste Water Treatment Directive 91/271/EEC. For agglomerations over 150,000 population equivalent, the directive mandates secondary biological treatment and, in sensitive areas, tertiary nutrient removal. The plant's design and operation align with these regulatory standards to ensure compliance with discharge limits. The treated effluent is discharged into the Someșul Mic River, a tributary of the Someș River, which flows into the Tisza River and ultimately the Danube River and Black Sea. This downstream chain highlights the plant's role in protecting both local water quality and the broader Danube Basin ecosystem.

The plant discharges into the Someșul Mic River, which joins the Someș River, a major tributary of the Tisza River. The Tisza flows into the Danube, which empties into the Black Sea. This watershed supports diverse aquatic life and is an important migratory corridor for fish species. The plant's treatment performance directly affects water quality in these downstream ecosystems.