Zarnowiec Wastewater Treatment Plant, Bolesław, Poland

Zarnowiec is a former wastewater treatment plant located in Bolesław, a town in the małopolskie voivodeship of southern Poland. The facility was designed with a capacity of 2,375 cubic meters per day and provided secondary treatment for municipal wastewater. It is now closed and no longer in operation. The plant operated under Poland's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this scale. As a small facility, it would have been subject to national regulations aligned with EU standards for effluent quality and environmental protection. The treated effluent from Zarnowiec would have discharged into local watercourses in the Vistula River basin, which ultimately flows into the Baltic Sea. The region's water bodies support diverse aquatic life and are part of the broader ecological network of southern Poland.

The plant's discharge would have entered the local watershed within the Vistula River basin, which drains into the Baltic Sea. This area supports aquatic ecosystems that depend on good water quality, and the facility's secondary treatment would have helped reduce organic pollutants and nutrients before discharge. The surrounding region includes agricultural and industrial areas, making wastewater treatment important for protecting downstream habitats.