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Data center water usage remains hidden
(www.datacenterdynamics.com)
This is a most excellent place for technology news and articles.
For California at least, residential use is about 10% of all water usage iirc. So if data centers are dwarfed by that...not a big concern in the big picture.
The issue I guess is when data center usage sucks up all the local supply. State and region wide they don't use much but they do use a lot in one small area.