The bright dye has spread in water, dying the stream and leaving geese and ducks with stained feathers. Several dead fish, tinged with blue, have also been found.
The environmental teams of the Environmental Company of the State of São Paulo (CETESB) analyze the water to assess the level of contamination.
Local and state authorities, as well as NGOs, work to save affected animals and alleviate additional damage.
Managers say that the dye contains an organic compound based on acetic acid, a substance known to be corrosive and dangerous for the environment.