Abstract. The study of environmental objects is of special importance in order to eliminate the increasing ecological imbalance in recent times. In this regard, it is important to control the eco-chemical state of freshwater resources for living creatures. For this purpose, water samples have been taken from the territory of Okchuchay to Azerbaijan and conducted their eco-chemical study. As an example, an eco-chemical study was conducted on the samples taken from the beginning, middle and lower streams, taking into account the degree of pollution and the self-regulating property of the river. Their physico-chemical parameters have been determined. At the same time, some cations and anions were investigated. In particular, the amount of iron and manganese ions, which are important in the integrity of the ecosystem, were compared with the permissible concentration limits. The effect of chemical pollutants on the ecosystem, on living organisms, on the  unity of the biocenosis has been studied.