There is a requirement to assessment the performance of water treatment plant for proper treatment of raw water. Percentage removal efficiency is used to determine the performance of the plant to assess how much contaminants were removed. This study was carried out to determine the efficiency of eleven water treatment plants in Udaipur through testing of water from source of water treatment plants and tap water of respective treatment plants in Udaipur. . Highest average efficiency is 65.84% of Fatehsagar RGF and lowest average efficiency is 54.88% of Titardi RGF. It is found that efficiency of Fatehsagar P.F., Gulab Bagh R.G.F. and Titardi RGF less than 60% and rest of all treatment plant have more than 60% efficiency. In this study comparison of raw and treated water and removal average efficiencies of water treatment plants were also found through results of laboratory testing and graphical representation of the obtained data for eleven water treatment plants. The finding of turbidity in raw water source of Fateh Sagar RGF, Fateh Sagar PF, Nandeshwar, Neemach Mata and WTP Smart City was relatively higher than 5 NTU which is desirable limit as per Indian standard drinking water specifications.