Why is natural water not considered to be safe for drinking? Share with your friends Share 0 Bhavishya Sharma answered this It is so because dust gets mixed with water. And rainwater can be acidic. 1 View Full Answer Ansh Garg answered this Natural water does not considered as drinking water due to it is a mixturreof dust particles an salt. It can also make us sick. 1 Aditi Jha answered this Natural water is not safe for drinking because dust particles get mixed with water. The rainwater can also be acidic 2