It’s not: the datacenter likely consumes less.
Datacenters (1) use non-potable water during normal operation and (2) return most of the water they use to the water system, instead of consuming it (as opposed to, say, a golf course).
I have yet to read anyone more compelling than Andy Masley on this: https://blog.andymasley.com/p/empire-of-ai-is-wildly-mislead...
(This isn’t a topic I know much about personally, so am open to being persuaded otherwise!)