ROWP CL Ostra Wastewater Treatment Plant, Tărnicioara, Romania

ROWP CL Ostra is a wastewater treatment plant located in Tărnicioara, a village in the commune of Ostra, Suceava County, Romania. The plant serves a population of 974 and provides secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive for agglomerations of this size. The plant has a designed capacity of 3,258 m³/day and currently discharges 94.18 m³/day of treated effluent. As a secondary treatment facility, it removes organic matter and suspended solids, meeting the regulatory requirements for inland discharge. The plant is operated as part of Romania's municipal wastewater infrastructure, which is aligned with EU directives. The treated effluent is discharged into a local watercourse that drains into the Siret River basin, ultimately reaching the Danube River and the Black Sea. The plant plays a key role in protecting the local aquatic environment and downstream ecosystems from untreated sewage pollution.

The plant discharges into a tributary of the Siret River, which flows into the Danube and then the Black Sea. The Siret basin supports diverse aquatic life and is an important ecological corridor. The plant's secondary treatment helps reduce nutrient and organic loads, protecting downstream water quality and preventing eutrophication in the Black Sea.