Chloroorganic pesticides belong to a group of compounds whose specific characteristics classify them as one of the most dangerous for the environment. Although the use of chloroorganic pesticides was banned in Poland and other countries many years ago, regular monitoring of these compounds in the natural environment is still required due to their exceptional toxicity and significant durability. Our paper presents and discusses the concentration levels of selected chloroorganic pesticides [p, p'-DDT and its metabolites (p, p'-DDE, p, p'-DDD), HCH isomers (α-HCH, γ-HCH), heptachlor, epoxide heptachlor, hexachlorobenzene (HCB), endrin, aldrin, and dieldrin] in soil, river sediment, and water samples taken from the Krzna River, the biggest left-hand tributary of the Bug River, and from its bank. The results indicate that the concentrations chloroorganic pesticides in the examined samples are generally low. Some increase of the accepted pesticide concentration level is observed in the vicinity of Rzeczyca village, which points to the necessity of continuous monitoring of this region.