Residues of endosufan have been reported in agricultural areas of previous usage and sometime in adjacent areas. For example, in the agricultural soil adjacent to the Mae Klong River in central Thailand, the concentrations of all isomers of enosulfan were reported to range from 0.5 to 16.1 mg kg dry soil. In another study, the highest concentration of endosulfan in sediments along the eastern part of the Gulf of Thailand ranged from 10 to 104 kg dry soil during drying season. The maximum levels of endosulfan in sediments were 49.4 kg dry soil in the estuary located at the mouth of the Chanthaburi River on Thailand . Endosulfan was reported to persist in for 3 months to more more than 2 years
depending on environmental factors and isomer forms of endosulfan. Endosulfan usually persisted longer in the environment than the isomer.