Water plays a major role in the journey of life on earth. Decrease in water resources and a consistent increase in water demand deserves more attention in the field of proper assessment of water requirement of a population group. Bengaluru, being the economic capital of Karnataka, considered as the Silicon Valley of India, is the only major metropolis in the country which is far from a perennial river source. The city has been experiencing huge depletion of green cover and ground water potential due to rapid urbanization. The city also faces the challenge of huge component of transient population which shows a distinct behaviour in comparison with the resident population of the city. For a growing city like Bengaluru, the challenge is to arrive at the average water consumption standard to determine the appropriate water demand. The water demand is calculated using the right population for future years and the per capita consumption standards specific to the water consumption scenario of the city. The study gives an attempt to arrive at the appropriate water requirement of Bengaluru undertaking population as a crucial factor. Based on the trends shown by the past population, the future growth scenario is arrived by identifying the appropriate factors contributing to the population growth. Logistic projection method is chosen for projecting the population based on the identified growth scenario. The water consumption pattern (LPCD-Litres per capita per day) for Bengaluru is arrived using a three-pronged approach viz: published water consumption standards, previous studies done for other similar Indian cities and a sample survey. The survey was done to validate the consumption standards taking into account different strata of population in the city viz; LIG (Low Income Group), MIG (Middle Income Group) and UIG (Upper Income Group) in a representative area. Based on the projected population and the per capita consumption, the demand for water is calculated for future years till 2031.