Throughout the years, we have talked about energy consumption in data centers, but,more recently, the focus has shifted to data center water consumption. There is a limited amount of data about how and why data centers use water. In the US alone, there are nearly 3 million data centers of various sizes that use water to cool their servers. In 2009, Amazon required 360,000 gallons of water per day to cool their 15 megawatt data center. They also admitted to needing to use their water more efficiently in the data center.