ONE THIRD of the world's fresh water supply is contaminated in the trumpet judgments, as stated in
Rev. 8 : 10 - 11
10 The third angel blew his trumpet, and a great star, blazing like a torch, fell from heaven. It fell on a third of the rivers and springs of water.
11 The name of the star is Wormwood, and a third of the waters became wormwood. So, many of the people died from the waters, because they had been made bitter.