摘要：Groundwater is considered a vital natural resource due to its significant use for drinking, irrigation andindustrial purposes. Groundwater has been a big variant in quality and quantity with respect to timeand space. So the quality of groundwater has been assessed in Salem district. A detailed study wasmade in the study area for the quality of groundwater for drinking in premonsoon and postmonsoonbased on the Water Quality Index (WQI). Groundwater samples were collected in sixty six locations inboth premonsoon and postmonsoon in the year 2007. Various physicochemical tests were carried outand WQI was calculated based on pH, turbidity, total dissolved solids, total alkalinity, total hardness,nitrate, chloride, calcium, magnesium, iron and fluoride. The comparison between the premonsoon andpostmonsoon reveals that in premonsoon season 56.06 %, and in postmonsoon 65.15 % of the watersamples were fit for drinking. The groundwater quality was found to be unfit for drinking in 22.72% ofthe samples in premonsoon and 18.18% of the samples in postmonsoon.
