Based on the chemical composition and groundwater reserves by balance calculations was revealed that discharges water drainage career at planned development of Bilanivo iron ore deposits in the Dniprodzerginsky reservoir won’t result in signifi cant environmental impacts. Other possible scenarios of discharges of discharge water will associated with significant changes in salinity of streams (in Psel river — twice growth, in Rud’ka river — 12 growth) and should be viewed as unacceptable. The work should be accompanied by regular hydrogeological, hydrochemical monitoring and remote sensing (aerospace monitoring).