Life on this planet would not have been possible if there was no water. The other name of water is life. Among the total world population of 6700 million, approximately 600 million people face the problem of chronic water scarcity and nearly 1 billion people do not have access to safe drinking water. In the developing countries, 80% of the diseases are caused by poor sanitation and unsafe drinking water. Groundwater is available to one-third of the world’s population, and its use is likely to increase in the future. Owing to developmental activities, the level of groundwater table is falling by 1–3 m every year. If the current trend continues, two out of three people on the earth will be living in water-stressed areas by 2025. Water supply will be, therefore, a major challenge in the coming years.