Castelo Branco Wastewater Treatment Plant - Serving 92,500 People in Central Portugal

Castelo Branco wastewater treatment plant is located in the city of Castelo Branco, Portugal, serving a population of approximately 92,500. The plant is part of the municipal wastewater infrastructure for this inland city in the Centro region. As an agglomeration serving over 90,000 people, Castelo Branco falls under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment as a minimum. The plant's capacity and treatment processes align with regulatory standards for medium-to-large agglomerations in Portugal. The treated effluent from the plant discharges into the local watershed, which ultimately drains into the Tagus River basin. The Tagus River flows westward through Portugal to the Atlantic Ocean near Lisbon. The plant plays a key role in protecting downstream water quality and supporting aquatic ecosystems in the region.

The plant discharges into the Tagus River basin, one of the major river systems in the Iberian Peninsula. The Tagus River flows through central Portugal and empties into the Atlantic Ocean at the Tagus Estuary near Lisbon. The estuary is an ecologically sensitive area that supports diverse aquatic life and migratory bird populations. The plant's treatment helps reduce nutrient and pollutant loads entering this important downstream environment.