Which of the following is considered the purest form of water?

Rainwater Groundwater Glacier water  None of the above

Rainwater

The correct answer is option 1. Rainwater. Rainwater is considered the purest form of water, as, during vapourization, impurities and salts present in water are left behind. However, because it picks up pollutants and other airborne debris, the rainfall we receive is undoubtedly not clean.