COV Chrastava Wastewater Treatment Plant, Chrastava, Liberecký kraj

COV Chrastava is a municipal wastewater treatment plant located in Chrastava, a town in the Liberecký kraj region of the Czech Republic. The plant serves a population of around 2,883 and has a designed capacity of 3,502 m³/day, with an average discharge volume of 995.53 m³/day. The plant provides secondary treatment, which is the standard biological treatment stage 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 (PE) between 2,000 and 10,000, ensuring organic matter and suspended solids are effectively reduced. Treated effluent from COV Chrastava is discharged into the local water environment, ultimately contributing to the Nisa River basin, which flows northward into Germany and joins the Lusatian Neisse. This river system supports diverse aquatic life and is an important water resource for the region. The plant plays a key role in protecting downstream water quality and maintaining the ecological health of the Nisa catchment.

COV Chrastava discharges treated wastewater into the Nisa River (Lužická Nisa), which flows north through the Czech Republic and Germany, eventually joining the Lusatian Neisse and later the Oder River before reaching the Baltic Sea. The Nisa River supports a variety of fish species and aquatic invertebrates, and its water quality is critical for both ecological balance and downstream human uses. The plant's secondary treatment helps reduce organic pollution and nutrient loads, contributing to the overall health of this transboundary river system.