Purpose. The study of mining water discharge into surface water bodies and determination of correspondence of measured values of hydrochemical and hydrophysical indicators of water quality with environmental safety standards. Methodology. The estimation of surface water bodies state under the conditions of mining water discharge was carried out as based on the average annual values of hydrochemical and hydrophysical indicators of water quality according to the requirements of Methodology of Ecological Estimation of Surface Water in Accordance with the Categories. The average values of the following three complex indices of water quality: pollution by saline components, ecological and sanitary indicators, and special indicators of toxic effect, were determined for every plot of surface water quality monitoring. Findings. The ecological state of water bodies affected by mining water of coal mining enterprises with respect to the system of ecological indicators was studied. It was determined that as for three complex indices of surface water quality in the plots of monitoring, the major pollutant was represented by the saline components, the minor one, by special indicators of toxic effect. It was stated that the quality of surface water in all plots does not meet the standards of ecological safety because of crude wastewater discharge by coal mining enterprises. Originality. The estimation of water quality of water bodies affected by mining water dischargewas carried out for the first time as based on the analytical study for enterprises of coal mining industry in Western Donets Basin. The estimation was based on the following complexes of indicators: saline components of water, ecological and sanitary criteria and special substances of toxic effect. Practical value. The results of the study can be used for the determining of the main vectors of water protection activity for the improvement of ecological state of water bodies or their sections, as well as for the estimation of nature conservation measures efficiency.

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