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Water is very important both in the present as well as in the future world because water is the basic necessities which are used in all operations of life. This is particularly true in the case of Thailand because water is very important to Thai’s life style and business due to increasing consumption of water in the recent decades along with the experience of frequent droughts and flooding due to deforestation. The water resources development budget has been increasing and represents a large portion of the budget for national development. This research is performed with aims to 1) analyze the consumption of water of the General Support Staff of Mahidol University, Thailand based on criteria of Eco - Index for fiscal years 2012–2014; 2) compare the statistical analysis of the average water consumption and average water used in each year; 3) compare the statistical analysis of the average water consumption per area and average water used in each year; 4) comparative statistical analysis of the average water consumption per head and average water used in each year. The result of the study concludes that the consumption of the amount of water varies according to the size of the space and the context in which the work operates, such as policies, management and measures for implementation of each assigned task. The study is important as it helps to find the detail comparative analysis of water consumption and activity of each department or faculties for the comparative analysis of water consumption and efficiency in management.