Perambalur is the most backward district in the state of Tamilnadu (India). Perambalur has 4 Unions of which Alathur union has historical importance and is blessed with fertile lands, having gypsum quarries and various types of industries. Alathur union has an area of 90 hectare of land in which 68 hectare is under cultivation. Alathur union is located in southern part of the Perambalur District. It has its border Trichy and Ariyalur districts. The people in the 39 villagers of the union use Kollidam river water and the ground water for drinking. Lot of work has been done and published already on the ground water quality of many village in other unions of perambalur district. But in the Alathur union, there is a need to undertake the study to assess the drinking water quality. Hence water samples of ten villages were subjected to systematic analysis. The Values obtained for different parameters, are compared with the standard values given by ISI/ICMR/WHO and suitable suggestion were made.