Comment Re:But the real cost is increased service prices (Score 2) 72
Nuclear reactors use most surface water, not ground water. So it doesn't normally affect drinking water or ground water levels.
Also, closed loop does not evaporate. The loop is not closed if stuff escapes from it. It just runs around in the piping system over and over again, but eventually water will become "dirty" and it will be dumbed into the sewers and replaced with new water.
You can arrange cooling also with non-closed loop where you use evaporation, as it was done in the old days, but in new data centers it is hardly used.