Nowadays the concept of food is changed, because food is no longer considered as a source of energy alone, but must provide a sense of pleasure and satisfaction with eating meals. But the unwillingness to develop awareness and raise the concept of food to a higher level, we have to emphasize and warn of the food safety related to chemical hazards. The presence of pesticides in food has a detrimental impact on human health and we tested the presence of organochlorine pesticides in eleven food samples of plant origin, randomly selected in one supermarket in Rijeka. During the sample analysis, the methods of extraction, reextraction, degradation, purification, GPC and GC-ECD were used. Our data indicated the presence of pesticides in the tested food samples, but the level is below the maximum permissible concentration (MPC). According to the results it can be concluded that the analyzed food samples did not have harmful effect on human health.