I am in Southern California and there is a limited amount of potable water we use because it will rain 4-5 days in 3 years (in total) during drought seasons. Water is abundant as seawater but drinkable potable water is a scarcity. It is most often found in precipitation, and that is stored underground in aquafiers. Large populations and big at can drain such storage, and the land will sink.
Water rationing is within our future. I think for much of the western us, unless desalination becomes more common. Desal is very energy intensive and faces environmentalist lawsuits.
Potable water is not as much of an issue in other parts of the US where it rains more often.
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