Revelation 16:4

And [then] the third [angel] poured out his bowl into the rivers and springs of water, and they turned into blood.

Revelation 8:10-11

[When] the third angel sounded its trumpet [I saw] a huge star, like a flaming torch, falling from heaven. It fell on one third of the rivers and on the springs of water.

Revelation 14:7

And he said [to them] in a loud voice, "Fear God and honor Him, for the time has come for Him to judge people. Worship Him who made the heaven, the earth, the ocean and the springs of water."

Revelation 16:5

Then I heard the angel [in charge] of the waters saying, "You are just, [you] who are [in the present] and who were [in the past], O Holy One, because you have judged [that these things should happen].

Treasury of Scripture Knowledge

Summary

And the third angel poured out his vial upon the rivers and fountains of waters; and they became blood.

Bible References

Upon

Revelation 8:10
[When] the third angel sounded its trumpet [I saw] a huge star, like a flaming torch, falling from heaven. It fell on one third of the rivers and on the springs of water.