In the present study aims at the assessment of various physical and chemical parameters of Vaigai reservoir water. Sampling was carried out from two sampling sites. The samples were analyzed in the laboratory as per the standard protocols. The annual mean values of each parameter from the two sampling sites were compared with W.H.O and I.S permissible limits. The physico-chemical parameters showed very few fluctuations and most of them were within the permissible limits of standards indicating better quality of reservoir. The results conclude the suitability of Vaigai reservoir water for various human needs. However, regular monitoring for its water quality maintenance is need of the hour to prevent its further deterioration.