What is the problem with fresh water?

For every living organism, in order to live, in addition to food, water is also needed. Fresh water plays an important role for human life. The problem with fresh water is that its quality deteriorates, and thus it can no longer be eaten or drunk in liquid form. The human factor itself is to blame. After all, we ourselves pollute our environment as much as we can. Yes, and everyone knows that fresh waters are more and more exhausted every year. Therefore, you need to conserve water.