It is not clear whether the patients are actually diagnosed with Legionnaire's disease, which is a serious type of pneumonia caused by Legionella bacteria, according to FOX19. 

The bacteria is most commonly found in water including groundwater, fresh, marine surface and potable water, according to the U.S. Environmental Protection Agency.

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A hospital statement to the Cincinnati Enquirer Saturday said it remains "inconclusive where the patients contracted the bacteria," but the medical facility immediately began increased water testing protocols and started an investigation. The use of bottled water is being done "out of an abundance of caution."

Normal hospital operations are continuing with no interruption to patient care, the statement read.