Organochlorine insecticides (OCI) belong to the group of chlorinated hydrocarbons with wide, but often uncontrolled, application in agricultural production. The consequence of this is that OCI and their residues are found in numerous samples ecosphere. Contamination of aquatic environments is particularly emphasized. Although OCI are toxic substance for wildlife, especially for human, a large part of the population is daily exposed to their activities in small quantities. OCI presence in drinking water is generally below the maximum allowable concentrations, whereas repeated doses can cause chronic toxic effects. For these reasons, it is necessary to continuously monitor the concentration of OCI in drinking water and perform its purification in order to obtain water with the lowest possible concentration. This work included the analysis of individual OCI concentration in drinking water, the city of Kraljevo. Certain individual concentration for seven OCI: alpha-hexachlorocyclohexane (α-HCH), gamma-hexachlorocyclohexane (lindane), heptachlor, aldrin, dieldrin, endrin, dichloro-diphenyl-trichloroethane (DDT). OCI were treated according to the appropriate EPA-608 method, liquid-liquid extraction, and then detected by gas chromatography method with appropriate columns. From the measured concentrations for individual OCI significantly increase heptachlor, which is almost four times, and aldrin, two times higher compared to the value of the said Ordinance MAC. Measured concentrations of dieldrin is at the upper limit value of the MAC. About a measured concentration of endrin could not be discussed because it is not regulated by the Ordinance value MAC.Overall, cumulative concentration OCI water pumping station with 0.294 µg/l, which is in line with the maximum permissible concentration of 0.5 µg/l according to the Regulations on the hygienic safety of drinking water. Given that this paper analyzed only seven organochlorine insecticides, it is the value of aggregate concentration unexpectedly high (over 50%). The results presented OCI in drinking water, especially measured increased concentrations of aldrin and heptachlor, indicate the processes of chemical contamination. For these reasons it is necessary to continuously check the concentration of total and individual OCI in drinking water and take effective measures purification
