Twenty-nine people are being treated at a local hospital after chemical leakage at a Houston waterpark.

The incident happened at the SIx Flags Hurricane Harbor Splashtown on Saturday.

The people are suffering from skin irritation and respiratory issues, authorities said.

Apart from the 29 being treated, 39 others were declined to be taken to the hospital after going through decontamination procedures.

There were some children among those who had been contaminated by the water, with one of the hospitalized children being as young as three.

According to the officials the chemicals involved included hypochlorite solution and 35% Sulphuric acid.

“The safety of our guests and team member is always our highest priority and the park was immediately cleared as we try to determine a cause,” Hurricane Harbor Splashtown spokesperson Rosie Shepard said in a statement, according to news outlets.

"Out of an abundance of caution, the park has been closed for the day.”

Authorities are investigating the cause of the incident, which they said was contained to one attraction at the park.

“Grateful for the swift action from first responders today at Splashtown,” Houston's chief elected official, Lina Hidalgo, tweeted.

“We've issued a closure order to investigate and ensure the park meets all requirements before reopening again.”