Greenbrook water treatment plant

Emergency responders at the scene of the Greenbrook Water Treatment plant, where an explosion was reported Wednesday evening. (Matthew Kang/CBC)

Local officials are reviewing the procedures at water treatment plants across Waterloo Region following an explosion Wednesday evening at a Kitchener water pumping facility. 

The explosion at the facility at 20 Greenbrook Drive was caused by a chemical reaction after a truck driver delivering ammonia made a mistake and put the chemical in a chlorine tank, said Thomas Schmidt, the region's transportation and environmental services commissioner.

He couldn't say exactly how the ammonia got into the chlorine tank.

The water pumping station was offline when the explosion occurred, and it remains offline Thursday.

"We have a number of safeguards on our chemical delivery process and delivery equipment so we are investigating this issue," said Nancy Kodousek, director of water services for the region. 

Kodousek said it will remain offline until the investigation, and any necessary repairs to the facility, are complete. Water supply would not be affected as a result of the closure, she said.

Kodousek couldn't say how long the investigation would take.

No one was hurt in the explosion and the region said that there is no danger to those in the vicinity of the facility.