The Present investigation addresses the groundwater quality aspects of Paravanar River Sub-Basin. Groundwater samples are collected from 35 locations during pre-monsoon for the year 2008 and analyzed for various physico- chemical parameters .Groundwater quality was evaluated with drinking water standards as prescribed by WHO (1984) standards. Gibbs diagram revealed that the overall hydrogeochemical environment of the study area is controlled by rock-water interaction. Three major hydrochemical facies (mixed CaMgCl, Ca–Cl and Na–Cl) were identified using a Piper trilinear diagram. Gibb’s diagram reveals that most the groundwater sample fall in the rock dominance field. The concentrations of cations and anions are within the maximum allowable limits for drinking purpose.