Sienna Wastewater Treatment Plant, Sienna, Poland - Closed Advanced Facility

Sienna wastewater treatment plant is located in the village of Sienna, within gmina Gródek nad Dunajcem, powiat nowosądecki, województwo małopolskie, Poland. The facility is currently closed and no longer operational. It was designed with an advanced treatment level and a capacity of 2,800 cubic meters per day, serving a small agglomeration. As a Polish plant, it operated under the national regulations transposing the EU Urban Waste Water Treatment Directive (91/271/EEC). For small agglomerations, the directive requires appropriate treatment before discharge into inland waters. The advanced treatment level suggests the plant was equipped to remove nutrients, likely due to the sensitivity of the receiving environment. The plant's discharge would have entered a local watercourse within the Dunajec River basin, which flows into the Vistula River and ultimately to the Baltic Sea. The region is characterized by hilly terrain and agricultural land, with the Dunajec River supporting diverse aquatic life and serving as an important ecological corridor.

The plant is situated inland in the Dunajec River basin, a tributary of the Vistula River, which drains into the Baltic Sea. The Dunajec River supports diverse aquatic ecosystems and is an important migratory corridor for fish. The surrounding area includes agricultural land and small settlements, with the river providing water for irrigation and habitat for species such as the European grayling and brown trout.