Superintendent Clay Hendrix says the elementary and high schools were the hardest hit.
Hendrix says 190 of the district's 1200 students didn't show up for school, and then things started getting worse. He says a new student was heading home every 15 minutes until schools closed down for the day around 1:30 p.m.
"This stomach illness has spread very quickly," he says. "Students have a lot of stomach pain and vomiting and of course they feel terrible."
Hendrix closed all three schools early so no one else could be exposed, and the Washington County Health Department sent over information on how to decontaminate buses and buildings.
Employees plan to thoroughly clean while kids get a few days off.
"We'll be doing some education on that this afternoon and cleaning pretty hard the next two days to get ready for the kiddos to come back," Hendrix says.
The district plans to re-open on Thursday, but Hendrix wants parents to make sure kids are symptom free for at least 24 hours before sending them back to school.