Sistema Cantareira Surpasses 50% Capacity Mark After Prolonged Drought

The Sistema Cantareira, a crucial water supply system servicing Greater São Paulo, closed October at 51.2% capacity, marking its first end-of-month level above 50% in 16 months. This milestone was last reached on June 17, 2025. The rise is attributed notably to heavy rainfall in October, which amounted to 210.8 millimeters—162% of the expected average and well above the historical mean of 130 millimeters. September's rainfall also contributed significantly, with 282.5 millimeters recorded, roughly 358.3% of the climatological average for the month.

The broader Sistema Integrado Metropolitano (SIM), encompassing Cantareira, currently operates at 61.9% of its capacity. Since August 2025, the São Paulo government has intensified efforts to conserve water resources, including pressure reduction during nighttime, which has saved approximately 209 billion liters—enough to supply 36 million people. Additionally, authorities are employing advanced water management techniques and accelerating strategic infrastructure projects to bolster system resilience.

These developments represent a positive shift after extended water shortages, reflecting effective governmental intervention alongside favorable weather conditions. The progress offers hope for improved water security for millions dependent on the Cantareira and the metropolitan system overall.