Tabuaco Wastewater Treatment Plant, Tabuaço, Portugal

Tabuaco wastewater treatment plant is located in Tabuaço, a town in the Viseu district of Portugal. The facility serves a population of approximately 3,600 and is designed to treat up to 3,605 cubic meters of wastewater per day, with a current discharge volume of 600.23 cubic meters. The plant provides secondary treatment, which is the standard level required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations with a population equivalent between 2,000 and 10,000. This directive ensures that wastewater is treated to remove organic matter and suspended solids before discharge. The treated effluent is discharged into the local watershed, which ultimately drains into the Douro River basin. The Douro River flows through northern Portugal and Spain, supporting diverse aquatic life and providing water for agriculture and human consumption. The plant's inland location reduces direct marine impact, but its discharge contributes to the overall water quality of the Douro catchment.

The plant discharges into the Douro River basin, which flows westward through Portugal to the Atlantic Ocean near Porto. The Douro is a major river supporting diverse aquatic ecosystems, including fish species such as the Iberian barbel and trout. The watershed is also important for agriculture, particularly vineyards in the Douro Valley. Proper wastewater treatment helps maintain water quality in this ecologically and economically significant basin.