A water contamination problem means Iroquois Ridge High School in Oakville will be closed Thursday and Friday.

Chemicals contaminated the drinking water at the school on Glenashton Drive during regular maintenance Wednesday evening, according to a notice on the school’s website.

“It is unclear whether students may have been exposed to contaminated water during the day,” the school’s notice said.

A daycare in the same building will be open Thursday.

The school is expected to reopen on Tuesday.