ROWP Cavnic Wastewater Treatment Plant, Cavnic, Maramureș, Romania

ROWP Cavnic is a municipal wastewater treatment plant located on Strada 22 Decembrie in Cavnic, Maramureș County, Romania. The plant serves a population of approximately 2,170 residents, classifying it as a small agglomeration under Romanian and EU regulations. The plant provides secondary biological 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. The designed capacity is 1,858 m³/day, with an average discharge volume of 734.4 m³/day, indicating operational headroom. The treated effluent is discharged into a local watercourse that flows through the Cavnic Valley, eventually reaching the Lăpuș River, a tributary of the Someș River, which drains into the Tisza River and ultimately the Danube River and Black Sea. The plant plays a key role in protecting the water quality of these downstream ecosystems.

The plant discharges into a small stream in the Cavnic Valley, part of the Lăpuș River basin. The Lăpuș River flows into the Someș River, a major tributary of the Tisza River, which joins the Danube before reaching the Black Sea. The surrounding area is mountainous and forested, with sensitive aquatic habitats that benefit from the plant's secondary treatment, reducing organic pollution and protecting biodiversity in the downstream river network.