Updated: 03/14/2014 5:41 PM
Created: 03/14/2014 1:51 PM KAALtv.com
(ABC 6 News) - The Minnesota Department of Health says "excessive levels of chloramines" are most likely to blame for a series of health issues experienced by dozens of children after they swam at the water park inside the Owatonna Holiday Inn last weekend.
Chloramines are an irritant byproduct of chlorine disinfection.
MDH Spokesman Doug Schultz says the department has identified 75 people who claim to have experienced symptoms such as a cough, red swollen eyes and runny noses after visiting the water park.
Schultz says the hotel also discovered a problem with its ventilation system today, which may have contributed to a lack of fresh air and a build up of irritants in the pool environment.
As we've reported, the MDH was not satisfied with the results of a follow-up test conducted Thursday morning and did not allow the pool to reopen today.
"They were very close, but the chlorine levels were not where they needed to be," said Schultz. "It will most likely remain closed through the weekend."