My understanding is that most new data centers don't use evaporation cooling these days, at least in water-sensitive areas. Hard to find solid data on this either way, though.
Of course, if you're using dry cooling, it uses more electricity, so hopefully you're using solar, not a source that uses evaporative cooling to produce electricity (if in a dry climate).
Here you go: https://en.m.wikipedia.org/wiki/Cooling_tower
Data centers use evaporative cooling towers which evaporate water to reject heat to the atmosphere.