 The study found that levels of organic chlorine pesticides, OCPs, in water and sediment samples collected from a river affected by agriculture were generally low. However, some OCPs such as PPDDT, OPDDT, PPDDE, OPDDE, Aldrin, Dildrin and Endrin exceeded the recommended threshold limits. These results suggest that further monitoring of OCPs in the river is necessary to ensure its long-term health. This article was authored by Adriana Mercedes Marquez, Samuel Cardenas, and Edelbito Guevara.