Dozens were hospitalized Tuesday evening after a chlorine overexposure at a Pleasant Grove public pool.

First responders were alerted at about 5 p.m. Tuesday of the overexposure at the Pleasant Grove Veteran’s Memorial Swimming Pool, according to Capt. Britt Smith with the Pleasant Grove Police Department.

Twenty-six people, ranging from small children to adults, were transported to area hospitals. The patients experienced symptoms from coughing and vomiting to fading in and out of consciousness, according to Smith.

Another 20 to 26 self-transported to area hospitals.

“We asked for mutual aid immediately and we triaged the patients very, very quickly,” Smith said.

Fifteen children were seen Tuesday at Timpanogos Regional Hospital, according to Nate Black, spokesman for the hospital. Of those, three were admitted, 10 are being observed and two had been released as of 7:30 p.m. Tuesday.

There were four patients being treated at Utah Valley Hospital and 15 at American Fork Hospital, as of Tuesday evening, according to Lance Madigan, a spokesman for Intermountain Healthcare.

Smith said officials believe that a pump malfunctioned, and then introduced a large amount of chlorine into the pool when it turned back on. The chlorine was isolated to a specific area in the pool, but became gaseous when it entered the pool.

It’s expected the pool will be closed for a period of time while investigators determine what happened.

The incident is not expected to be criminal, Smith said.

“We do not believe this was intentional, we believe it was a failure of equipment,” Smith said.

Braley Dodson covers health and education for the Daily Herald.

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