The problem of global warming is increasing due to an increase in CO2 emissionsby 33%, an increase in water consumption by 17%, energy consumption by 30% - 40% and raw materials by 40% - 50% in building operations. One of the efforts to reduce the occurrence of these problems can be done through one of the green building , namely water conservation and efficiency. According to Yudo, saving water is a very important effort to avoid water scarcity. In addition, saving water is an effort to use water efficiently. Therefore, this study was conducted to analyze the application of water conservation and efficiency in the Tower LawThe data collection method used in this study was based on interviews, observations and measurements. The data obtained will be analyzed for water conservation which is applied to towers legal existing Greenship building and water efficiency levels using the Excellence in Design for Greater (EDGE) system. Based on the results of the analysis carried out on tower , the results of the application of water conservation with the Greenship existing building standard only got 11 points out of a maximum total of 20 points. In addition, the application of water efficiency that has been carried out tower based on the EDGE system obtained 24.28% water efficiency measures. From the results of the analysis, it was found that tower has not met the criteria for water conservation well but has met the level of water use efficiency based on the green building .