# Guandu Water System maintenance in Rio de Janeiro

> Developing situation record from CLSTR: https://clstr.news/situations/guandu-water-system-maintenance-in-rio-de-janeiro
> Updated: 2026-11-02T19:09:54.000Z. Sources: 18. Developments: 2.

The Companhia Estadual de Águas e Esgotos do Rio de Janeiro (Cedae) scheduled annual preventive maintenance for the Guandu Water System to begin at 4:00 AM on Tuesday, November 3. The operation is intended to prepare the treatment station for higher water consumption during the summer season.

As of Tuesday morning, water production was suspended, affecting the municipalities of Rio de Janeiro, Belford Roxo, Duque de Caxias, Mesquita, Nilópolis, Nova Iguaçu, Queimados, and São João de Meriti. The maintenance involves approximately 500 employees performing inspections, cleaning, and repairs, including the installation of a large-scale macrometer.

While technical services were expected to conclude by early Wednesday morning, residents in the Rio de Janeiro metropolitan area and Baixada Fluminense have continued to face water shortages. Concessionaires noted that supply normalization may take up to 72 hours following the resumption of production, especially in elevated areas or at the ends of distribution networks. Water trucks are being prioritized for hospitals and emergency units.

Iguá Rio has since reported that scheduled interventions, including connections to a new large-scale pipeline in Outeiro, were finished ahead of schedule. Distribution is expected to resume gradually once the Cedae-managed Guandu System reaches 100% capacity.

## Claims

- Cedae suspended water production at the Guandu System on Tuesday morning. (reported by 3 sources)
- Maintenance is scheduled to conclude at 4:00 AM on Wednesday. (reported by 3 sources)
- The Guandu System supplies approximately 9 million people in the Rio de Janeiro metropolitan region. (reported by 3 sources)
- Full normalization of water supply may take up to 72 hours after maintenance ends. (reported by 2 sources)
- A team of 500 employees is performing maintenance across more than 100 work fronts. (reported by 2 sources)
- The Guandu Water Treatment Plant has been recognized by Guinness World Records as the largest continuous water treatment station in the world since 2007. (reported by 2 sources)
- The Guandu System produces an average of 43,000 liters of water per second. (reported by 2 sources)
- Maintenance includes the installation of a macrometer for large-diameter pipes. (reported by 2 sources)

## Timeline

### 2026-11-02: Cedae suspends Guandu System production for summer maintenance

Cedae suspended water production at the Guandu System for preventive maintenance to prepare for summer demand, affecting approximately 9 million people in the Rio de Janeiro metropolitan area.

15 sources. https://clstr.news/cluster/cedae-suspends-guandu-system-production-for-summer-maintenance

### 2026-10-30: Guandu Water System maintenance to affect Rio de Janeiro supply

Annual preventive maintenance at the Guandu Water System will suspend water production for several Rio de Janeiro municipalities from November 3 to November 4.

4 sources. https://clstr.news/cluster/guandu-water-system-maintenance-to-affect-rio-de-janeiro-supply

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Cite as: Guandu Water System maintenance in Rio de Janeiro. CLSTR, https://clstr.news/situations/guandu-water-system-maintenance-in-rio-de-janeiro