Microbial load in the groundwater and the physico-chemical characteristics of the water samples in and around the dumpsite of Dindigul town, Tamil Nadu, was studied. A microbial analysis of the leachate of the municipal solid waste, the ground water collected from the dumping yard and the ground water collected from a distance of 100 feet away from the dumping yard was also carried out to find out the effect of the municipal solid waste on the ground water quality.