Dozens of Queens students became ill at a Flushing elementary school Tuesday, according to fire officials, and investigators believe it may have been the result of contaminated water fountains.

Department of Education officials say the school staff contacted 911 after the children developed stomach aches at P.S. 20 John Bowne Elementary School.

Fire officials say 74 students complained of nausea after drinking the pink-colored water.

About 20 of the stricken children were treated in area hospitals and released.

"It looks to be an internal condition in the plumbing. The plumbing company that was working for the Department of Education, building facilities people, were working on their refrigerant and cooling system," said Jim Robbins of the Department of Environmental Protection.

"Antifreeze can be very sweet. And sometimes it's a problem. So when I spoke to some of the children as to how much they drank, and when did they stop drinking, probably because it was sweet they kept drinking," said Glenn Asaeda of the New York City Fire Department. "So not knowing exactly what the substance might be and how much they had consumed, we really precautionary transported all children who had ingested this water."

None of the children are expected to be admitted into the hospital overnight, according to the DOE. The parents of the affected children were notified.

Some students told NY1 that other nauseated children were assessed in the auditorium.

"I heard that the water's contaminated. So like, all the children that drank water from the fountains, their stomachs started hurting. They threw up, and they're all sick," said one student.

"The staff, the principal did a wonderful job. They all came together to make sure that every went smoothly and went in an orderly fashion," said a bystander. "They had the EMS come in, check everybody out, give them vomiting bags. So everyone was very calm, I must say."

The Department of Environmental Protection is still determining the cause of the incident.