Sabesp cuts São Paulo night‑time water pressure reduction to eight hours

Sabesp water pressure reduction Cantareira reservoir São Paulo Asesp

Sabesp announced that the nightly water‑pressure reduction period in the Greater São Paulo region will be shortened from ten to eight hours, now running from 22:00 to 06:00. The change follows improved conditions in the Cantareira reservoir system after rains that exceeded forecasts, allowing the water‑use alert level to move from level 3 to level 2, a roughly 6 % rise in stored volume. The Asesp regulator approved the adjustment on the recommendation of the Committee for Integrated Agency Water Security, which monitors reservoir levels. The reduced low‑pressure window continues to affect households without storage tanks, but authorities stress that water‑saving habits remain essential while reservoirs stay below historic averages.

The decision reflects a broader strategy of demand‑side management by the state government and highlights the importance of coordinated rainfall, reservoir monitoring, and consumer cooperation in maintaining water security for millions of residents.

Entities: Agência Reguladora de Serviços Públicos do Estado de São Paulo (Arsesp) · Asesp (Agência Reguladora de Serviços Públicos do Estado de São Paulo) · Cantareira Reservoir System · Committee for Integration of Agencies for Water Security · Natália Resende · Sabesp · Sabesp (Companhia de Saneamento Básico do Estado de São Paulo) · Sistema Cantareira · São Paulo

Claims

What the coverage asserts, and how well corroborated each claim is across sources.

[● 3 SOURCES] The GDN program, started in August 2025, has saved 183 billion litres of water, enough for 32 million people for 30 days.
[● 3 SOURCES] The change follows a shift from band 3 to band 2 in the Cantareira system contingency curve.
[● 3 SOURCES] Arsesp approved the adjustment after a recommendation from the Committee for Integration of Agencies for Water Security.
[● 3 SOURCES] The observed useful water volume reached 39.9 %, above the expected 37.8 %, a gain of 2.1 %.
[● 3 SOURCES] Rainfall in Extrema, Minas Gerais during that week was 61.2 mm, 144.3 % of the climatological average.
[● 3 SOURCES] Rainfall between 20 and 26 July was 31.6 mm, 177 % of the forecast.
[● 3 SOURCES] Natália Resende said the current volume is 2.67 % above the projection for July.
[DISPUTED] Sabesp will reduce the night water demand management period from 10 hours to 8 hours, with a schedule of 22:00‑06:00.