Refojos Wastewater Treatment Plant, Cabeceiras de Basto, Portugal

Refojos is a wastewater treatment plant located in Ponte de Pé, Refojos de Basto, within the municipality of Cabeceiras de Basto, Braga district, Portugal. The plant serves a population of approximately 2,000 people and is classified as a small-scale municipal facility. It operates under the national regulatory framework aligned with the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant provides secondary treatment, which is the standard required by the EU directive for freshwater discharges from agglomerations of this size. Its designed capacity is 4,000 m³/day, with an average daily discharge volume of 333.46 m³/day, indicating a utilization rate well below capacity. The facility is managed as part of the municipal wastewater infrastructure of Cabeceiras de Basto. The treated effluent is discharged into a local watercourse that ultimately drains into the Tâmega River, a tributary of the Douro River. The Douro River flows through northern Portugal and into the Atlantic Ocean at Porto. The plant plays a key role in protecting the local watershed and downstream aquatic ecosystems from untreated sewage pollution.

Refojos WWTP discharges into a small stream that feeds into the Tâmega River, which joins the Douro River before reaching the Atlantic Ocean. The Douro basin supports diverse aquatic life and is an important ecological corridor in northern Portugal. The plant's secondary treatment helps reduce organic load and nutrient pollution, safeguarding water quality in the downstream river system and the coastal zone.