The goal of the current study was to determine the water quality for public consumption, recreation, and other uses by computing the Water Quality Index (WQI) of a freshwater inland lake in Jaipur, Rajasthan. The study of how environmental factors affect the lake's water quality is the subject of this essay. Water quality can be assessed using a variety of techniques for industrial, agricultural, and drinking purposes. For the general public or for any intended purpose, as well as in efforts to decrease pollution and manage water quality, the Water Quality Index, which describes water quality in terms of an index number, offers a valuable picture of the general water quality. The suitability of water for a certain function is influenced by a variety of factors. In this study, Water Quality Index of an inland lake, Lake Chandlai in Jaipur district of Rajasthan was determined on the basis of various physico-chemical parameters like pH, turbidity, electrical conductivity, total dissolved solids, total alkalinity, chloride, dissolved oxygen, phosphate and nitrate studied for a period of two years (2018-20).