Based on studies conducted in the past decade in the southern region of Brazil to determine residue levels of the pesticides
normally used on irrigated rice crops, changes can be observed in relation to the presence of pesticides in the waters of the main
river basins in Santa Catarina State. In previous harvests, the presence of residues of 7 pesticides was determined, with the
herbicide bentazon and the insecticide carbofuran being the products showing highest frequency. Following toxicological tests
conducted with 8 different test organisms, deterministic and probabilistic risk analysis was performed to assess the situation of
the river basins in areas used for the production of irrigated rice. Of the species tested, the herbicide bentazon showed greatest