Pinhel Wastewater Treatment Plant: Serving Pinhel, Guarda, Portugal

The Pinhel wastewater treatment plant is located in the town of Pinhel, in the Guarda district of Portugal. It serves a population of approximately 3,300 residents and has a designed capacity of 6,736 cubic meters per day. The plant provides secondary treatment, which is the standard level required for inland communities of this size under Portuguese and EU regulations. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations with a population equivalent between 2,000 and 10,000 are generally required to have secondary treatment. Pinhel, serving 3,300 people, falls within this category and meets the directive's requirements. The plant's discharge volume is reported as 550.21 m³/day, indicating operational activity. The treated effluent is discharged into local watercourses that eventually drain into the Douro River basin. The Douro River flows westward through Portugal and empties into the Atlantic Ocean near Porto. The plant's inland location, over 50 km from the coast, reduces direct marine impact, but its discharge contributes to the overall water quality in the Douro watershed, which supports agriculture, ecosystems, and downstream communities.

The Pinhel plant discharges into the Douro River basin, one of the major river systems in the Iberian Peninsula. The Douro River flows from Spain through northern Portugal to the Atlantic Ocean, supporting diverse aquatic life and providing water for irrigation and drinking. The region's Mediterranean climate with seasonal rainfall means that river flows vary, and consistent treatment is important to maintain ecological balance.