COV Tremosna Wastewater Treatment Plant, Třemošná, Czech Republic

COV Tremosna is a municipal wastewater treatment plant located in Třemošná, a town in the Plzeňský kraj region of the Czech Republic. The facility serves a population of approximately 3,186 and operates with a designed capacity of 4,000 m³ per day, currently treating an average daily flow of 880.16 m³. The plant provides secondary treatment, which is the standard level required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The directive mandates secondary treatment for all discharges from agglomerations with a population equivalent above 2,000, ensuring effective removal of organic matter and suspended solids. The treated effluent is discharged into the local watershed, which ultimately drains into the Berounka River and then the Vltava River, a major tributary of the Elbe River that flows into the North Sea. The plant plays a key role in protecting the water quality of these downstream water bodies and the broader Elbe basin ecosystem.

The plant discharges into the local stream network that feeds the Berounka River, a significant tributary of the Vltava River. The Vltava flows through Prague and joins the Elbe, which drains into the North Sea. This watershed supports diverse aquatic life and provides drinking water for downstream communities. The secondary treatment ensures compliance with EU standards, reducing organic pollution and protecting the ecological health of the receiving waters.