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The Cananéia estuary is an important biological area on the southeast coast of Brazil. In the past, it was impacted by both chlorinated pesticides and polychlorinated biphenyls (PCBs) due to its natural location. The marine tucuxi dolphin (Sotalia fluviatilis) is a top predator in this ecosystem and can be found year round in Cananéia estuarine waters that represent an important nursing area for the species. This work investigated chlorinated compounds in the blubber of nine individuals from the Cananéia estuary. Residue levels of DDTs (0.541–125 μg g⁻¹ lipid wt.) were the highest, followed by PCBs (0.2–9.22 μg g⁻¹ lipid wt.), mirex (0.014–0.312 μg g⁻¹ lipid wt.), chlordanes (0.001–0.047 μg g⁻¹ lipid wt.), HCHs (<0.003–0.044 μg g⁻¹ lipid wt.), and HCB (n.d.−0.024 μg g⁻¹ lipid wt.). The mean p,p′-DDE/Σ DDT ratio was approximately 0.8 and is indicative of the former DDT application in the study area. PCB …