According to the Regulation water classification, "Official Gazette of SRS", No. 5/68 [10], Pek River is classified into the 2nd class of water quality which is suitable for bathing, recreation and water sports. Based on the results from this study it could be concluded that the water quality of Pek River significantly depends on sampling sites. In locations 1 and 2 the quality correspond to the 1st and 2nd class except for copper content. The results of physicochemical analysis showed that copper and sulphates were present in almost all water samples in exceeded values. It was registered elevated concentrations of iron, copper, manganese, total suspended solids, turbidity, ammonium nitrogen and orthophosphate in locations 3 and 4.