The Channahon Fire Protection District said they were working on a high-angle rescue at 23315 S. Youngs Road about 11:25 a.m.
A 35-year-old man on the inside of the water tower was having trouble breathing, fire officials said.
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The man was lowered to the ground about 1:40 p.m.
He was taken to an ambulance, and was being evaluated, fire officials said.
The man's condition was not immediately clear.
Fire officials said the heat and height of the rescue posed challenges for crews.
Crews remained on the scene cleaning up rescue equipment Thursday afternoon.
This is a developing story; check back with ABC7 Chicago for updates.