Vilar Formoso Wastewater Treatment Plant | Guarda, Portugal

Vilar Formoso wastewater treatment plant is located in the town of Vilar Formoso, within the municipality of Almeida, Guarda district, Portugal. The plant serves a population of approximately 2,900 residents, providing secondary treatment for municipal wastewater. It is an inland facility, situated away from coastal areas. The plant operates with a designed capacity of 10,500 m³/day, and the current discharge volume is 483.52 m³/day, indicating a utilization rate well below capacity. As a secondary treatment plant, it meets the requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size, which mandates secondary treatment for populations between 2,000 and 10,000 in inland areas. The treated effluent from Vilar Formoso is discharged into the local watershed, which ultimately drains into the Douro River basin. The Douro River flows westward through Portugal and empties into the Atlantic Ocean near Porto. The plant plays a key role in protecting the water quality of the Douro River and its tributaries, supporting aquatic life and downstream ecosystems.

The Vilar Formoso plant discharges into the Douro River basin, which flows into the Atlantic Ocean. The Douro River supports diverse aquatic life and is an important ecological corridor in northern Portugal. The plant's secondary treatment helps reduce organic pollutants and nutrients, protecting the river's water quality and the downstream environment.