Trojczyce Wastewater Treatment Plant, Trójczyce | Podkarpackie, Poland

The Trojczyce wastewater treatment plant is located in Trójczyce, a village in the Podkarpackie Voivodeship of southeastern Poland. It serves a population of approximately 5,028 people, classifying it as a small agglomeration under Polish and EU regulations. The plant is situated inland, away from coastal areas, and treats municipal wastewater from the local community. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 4,755 m³ per day and an average daily discharge of 717 m³, the plant operates well below its capacity, indicating room for future growth. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into local watercourses that eventually drain 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 local watershed from pollution, supporting aquatic life and downstream water quality in the Vistula basin.

The plant discharges into small streams that feed the San River, a major tributary of the Vistula. The Vistula basin supports diverse aquatic ecosystems and is an important migratory corridor for fish. The region's inland location means the effluent does not directly impact coastal waters, but it contributes to the overall health of the Baltic Sea catchment area.