Zawoja Widly Wastewater Treatment Plant, Zawoja, Lesser Poland

Zawoja Widly is a municipal wastewater treatment plant located in Zawoja, a village in the Lesser Poland Voivodeship (województwo małopolskie) in southern Poland. The plant serves a population of 2,096, classifying it as a small agglomeration under Polish and EU regulations. It is situated in the mountainous region of the Beskids, near the border with Slovakia. The plant provides secondary treatment, which is the minimum standard required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for inland agglomerations of this size. The designed capacity of 3,387 m³/day indicates the plant is sized to handle peak flows, with current discharge averaging 298.86 m³/day. As a Polish facility, it operates under the national Water Law Act and is subject to permits issued by the Regional Water Management Board (RZGW) in Krakow. The treated effluent is discharged into a local watercourse that eventually drains into the Skawa River, a tributary of the Vistula River. The Vistula flows northward through Poland to the Baltic Sea. The plant plays a key role in protecting the Skawa and Vistula watersheds from untreated sewage, supporting aquatic life and downstream water quality in this ecologically sensitive mountainous region.

The plant discharges into a local stream that feeds the Skawa River, a right-bank tributary of the Vistula. The Vistula River flows through Krakow and Warsaw before reaching the Baltic Sea via the Gulf of Gdańsk. The surrounding Beskid Mountains are characterized by forested slopes and diverse wildlife, including protected species such as the Carpathian brown bear and lynx. The watershed supports salmonid fish populations and is an important migratory corridor for birds. Secondary treatment ensures that nutrient and organic loads are reduced before discharge, helping to prevent eutrophication in downstream waters.