Water quality control in its origin is ensured by collecting water samples from different origins that EPAL uses for producing water for human consumption as to assess the evolution of untreated water quality, screen eventual anomalous results throughout its collection, treatment, transport, supply, and support of the treatment process.

Superficial intakes for producing water for human consumption, which are included in this operational control, are:

• Castelo do Bode | Zêzere river
• Valada do Ribatejo | Tagus river