Chiller & Cooling Best Practices, Mar. 2017, by Douglas Bougher and Kent Martens.
http://www.coolingbestpractices.com/technology/cooling-towers/cooling-towers-offer-data-centers-water-and-energy-savings

"The number of data centers in the United States continues to grow in response to the enormous amount of digital information stored and streamed. The massive computer power within these data centers generates heat, making efficient cooling a key building system requirement. Evaporative cooling towers are an integral part of many data center cooling systems. Recently some have questioned the use of cooling towers, citing water scarcity to bolster their arguments. But a thorough examination of water use for local onsite cooling towers compared to water use to generate power at regional fossil fuel power plants reveals surprising results."