Urbanization reduces the opportunity for storm water infiltration that lessens groundwater recharge and increases pollutant loads into streams in Taiwan. The green building labeling system was established in 1999. The soil water content index (λ) is used to maintain the hydrologic conditions between pre- and post-development at the construction site. By the end of 2014, a total of approximately 4,800 buildings or projects were certified as green buildings, and about 70% of cases used soil water content. Since the study found the existing cases for estimating soil water content, there are regional differences between the use of soil water content. There has been an increase in the adoption rate of the specific soil water content index in the revised Green Building Standard Chapter in the Building Technical Regulations. This information can be used as advice to improve the lack of soil water content index of Green Buildings and be a frame of reference when the government sets up the relevant polices.