For the first time, a comprehensive evaluation was carried out to assess the presence of banned, restricted, and widely used permitted pesticides in Lepas anatifera, a globally distributed oceanic species. This study aims to shed light on ocean health along Brazil's equatorial margin, a region identified as a priority for future exploration. Additionally, it seeks to contribute to the understanding of the South Atlantic Ocean, a region with limited scientific studies, by evaluating the potential risks associated with the ingestion of these barnacles. Specifically, the study investigates their potential role in cancer development or disruptions to the endocrine system, considering their critical position within the oceanic food web. A total of 60 organic pollutant compounds were analyzed in 1903 individuals distributed in 19 sample groups of L. anatifera using gas chromatography (GC) equipped with both an electron capture detector (ECD) and a nitrogen-phosphorus detector (NPD) (GC-ECD/NPD). The highest total concentration of permitted pesticides in L. anatifera was triazines (Ʃ