Bellary district has 25 % of India's Iron ore reserves and is well known for its rich iron and manganese ore reserves. Iron ore deposits in Bellary district are widespread and have been a backbone of industrial development in the region. The environmental impact of large-scale mining activities includes soil erosion, a formation of sinkholes, loss of biodiversity, and contamination of soil, groundwater and surface water by chemicals from mining processes.In this paper, efforts have been made to assess the quality of Tunga - Bhadra river water extensive survey and laboratory analysis which would give the information about ‘Impacts on reservoir water quality’ due to the Iron and steel industry. Also, an attempt has made for controlling the groundwater pollution, which would serve as a basis to evolve suitable management strategy for the District. Therefore there is significant changes in values of different parameters of ground water sources indicate the influence of industrial wastes on groundwater.