Tons of fish have perished in the Piracicaba River, located in São Paulo state, following an alleged illegal industrial waste discharge. This catastrophe highlights the severe impact of Pollution on the region’s ecosystem. Authorities have traced the source of the Pollution to an irregular release of wastewater from the Estiva company’s São José plant in Rio das Pedras. This discharge flowed into a stream feeding the Piracicaba River, leading to the death of between 10 and 20 tons of fish, according to initial estimates by São Paulo prosecutors.
The Piracicaba River, often referred to as São Paulo’s mini-Pantanal due to its rich biodiversity, has suffered significant ecological damage. Adriano Queiroz from the state’s environmental agency stressed that it could take years for the river to recover, given the diversity of species affected.
The environmental disaster has deeply affected local communities, particularly fishermen who rely on the river for their livelihood. Prosecutors are seeking comprehensive reports on the water conditions to assess the extent of civil and criminal liabilities. Authorities have initiated an investigation to determine whether an environmental crime was committed, with the company potentially facing substantial fines.
Upon receiving reports of the incident on July 7, São Paulo’s environmental agency CETESB requested the Salto Grande hydroelectric plant to release more water, aiming to dilute the pollutants. This intervention led to improved conditions by July 9, as increased oxygen levels supported the survival of remaining fish populations. However, subsequent fish deaths were reported in Tanqua, a protected area 60 kilometers from the initial site.

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