The level of ground water is going lower and lowers as people are digging deeper to draw out water. The problem is worse in cities and towns.
When a river begins its journey from the mountains it is clean and clear. But as it travels down to the plains its color and looks change. It looks dirty and the color turns grey.
To protect water bodies, waste from factories and houses should not be dumped into rivers, lakes of streams. There should be proper laws to stop factories from polluting water.
Sometimes even the water you get from your tap may not be safe to drink. You need to clean or purify it. Dirty water contains germs. If we drink this water we can fall sick. So it is important that we clean the water before drinking it.