The incident happened just after 8am. According to authorities, someone noticed a puddle inside a closet next the emergency room.
As a precaution, hospital officials shut down the ER and called the Houston Fire Department.
HFD officials determined about a half gallon of formaldehyde had leaked in the closet. They cleaned the mess and checked out three people who came in close contact with the chemical.
There is no word on what caused the spill.