Miejska Oczyszczalnia Sciekow - Stalowa Wola Municipal Wastewater Treatment Plant

Miejska Oczyszczalnia Sciekow is the municipal wastewater treatment plant for Stalowa Wola, a city in the Podkarpackie Voivodeship of southeastern Poland. The plant serves a population of approximately 52,356, classifying it as a medium-sized agglomeration under EU criteria. As a Polish facility, the plant operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment for agglomerations of this size discharging to inland waters. Polish regulations transpose this directive, and the plant is expected to meet effluent standards for biochemical oxygen demand, chemical oxygen demand, and suspended solids. The treated effluent is discharged into the San River, a tributary of the Vistula River, which flows into the Baltic Sea. The plant plays a key role in protecting the San River's water quality and the downstream Vistula estuary ecosystem.

The plant discharges into the San River, a major right-bank tributary of the Vistula River. The Vistula flows northward through Poland and empties into the Baltic Sea via the Vistula Lagoon and the Gdańsk Bay. The San River supports diverse aquatic life and is an important migratory corridor for fish species. Protecting water quality in this river system is critical for the ecological health of the Vistula basin and the Baltic Sea coastal zone.