The research work is proposed to compute the water quality index (WQI) of the ground water in the proximity around the vellalore landfill site in order to understand the quality of water for public utilization, other purposes. The manuscript handles with the evaluation of the impact of environmental characteristics on the water quality. Water quality index, specifies the water quality in terms of index numerals and provides a convenient portrayal of overall quality of water quality management. In this research water quality was set on various physico – chemical characteristics like pH, electrical conductivity (EC), total suspended solids (TSS), total dissolved solids (TDS), turbidity, total hardness (TH), total alkalinity (TA), calcium (Ca), magnesium (Mg), chloride (Cl), nitrate (No3), sulphate (So4), dissolved oxygen (DO), biological oxygen demand (BOD), chemical oxygen demand (COD) and fecal coli forms. The existance of contaminants in groundwater specifically near the landfill sites reminds its quality and thus provides the corresponding aquifer undependable for domestic water supply and other uses. Geographical Information System (GIS) sets out as substantial software that clears the way for multi – map integrations. In this investigation, ground water quality is assessed and presented in a GIS based water quality mapping.