Assessment of groundwater quality is important in many groundwater studies. Water never occurs in its pure state in nature. Groundwater composed of chemical ions in the form of solution. The type and concentration of these elements depends upon the surface, sub-surface environment, rate of groundwater movements and the source of groundwater. In addition to the above natural causes, man also contributes his share in changing the quality of water by sending sewage into ground and contaminating the aquifer by discharging industrial waste into it. The use of groundwater for drinking, agricultural and industrial needs is determined by, physical and chemical characteristics. The hydrochemical studies generally involve (i) a description of the occurrence of various constituents in groundwater, (ii) the relation of these constituents to water use, (iii) identification of geochemical patterns and (iv) the development of a hydrogeochemical model of the area. The present experimental work determines the ground water quality parameters by using GIS software at Ariyalur taluk, Tamil Nadu, India.