An amount of fresh water is made unavailable by pollution and contamination. At the same time the population is growing which puts pressure on our water supply. Less than one percent of the World’s fresh water is available for human consumption and water used is many times taken out of fresh water circulations.
The water we get comes from surface waters and natural underground reservoirs called aquifers. In many cases, several legal jurisdictions will rely on the same aquifer, which can lead to the water supply being used up faster than it can be replenished. In the case of the Tri-state Water War involving Georgia, Alabama, and Florida, the three states rely on water from the same two river basins. The major upstream city, Atlanta, is accused of using too much of the available water so that there is less available for the downstream areas, many of which rely on the water for agricultural as well as industrial and personal use. So the problem is not that the water will not return (though as djstam said, it may be contaminated) it is that more and more it is used up faster than it can be replenished.
You must understand that while water does go back into the ground eventually, the supply of fresh water in the world is very limited. Humans cannot drink salt water from the sea, so fresh water is our only option. So when people waste what little we have unnecessarily, especially with rising populations, it becomes even more precious. It also doesn’t help when people (either on purpose or by ignorance) contaminate our fresh water, because we lose even more. We need water to live, and it would be a very dark day indeed when humans begin killing one another for it.
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