In some places they can recycle/reclaim the water. But it costs money and energy to recycle the water. So in effect you are wasting money not water as such. Even then it’s not 100% efficient so some is lost.
In other places, the waste water just goes into rivers/sea and isn’t available to be used and is in effect lost.
Also waste refers to using water without a purpose. Having a shower has a purpose, of cleaning you. So having a shower isn’t a waste of water. Having an excessively long shower doesn’t have any real significant benefit and hence is thought to be “wasteful”.
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