In the present study, water quality Index (WQI) calculated and intended of the water bodies to ascertain the quality of water for public health in Bilari town of Moradabad district, Uttar Pradesh, India. This study deals the influence of environmental parameters of water quality of different water bodies. There are many ways to evaluate the quality of water as deemed fit for drinking and irrigation purpose. WQI indicating the water quality in terms of index number which offers a useful representation of overall quality of water for public use or for any other intended applications. A number of parameters affect the usability of water source for particular purpose. In this study water quality index is determined on the basis of various physico-chemical parameters. From the foregoing observation of the physico-chemical parameters, it may be concluded that the water bodies show the characters of eutrophication.