Cantareira Ends Summer at Decade-Low Level in São Paulo

Overview

• Sabesp data show the Cantareira system at about 43% capacity at the start of autumn, the lowest end‑of‑summer level in 10 years.
• The utility classifies the system in Faixa 3, an alert band, following a multiyear slide from 79.6% in 2023 to 58.9% in 2025.
• Arsesp continues a 10‑hour nightly pressure reduction from 7 p.m. to 5 a.m., a measure Sabesp says has saved roughly 103 billion liters.
• Meteorologists expect limited replenishment through autumn and winter, and Cemaden projects Cantareira could end September near 40%.
• The integrated metropolitan network is at 56% capacity, lifted by reservoirs like Guarapiranga near 93%, while Cantareira supplies about 8.8 million people.