Toronto Public Health has confirmed that a TTC cooling tower is the main origin of a Legionnaires' disease outbreak in Toronto. Public health teams issued a formal public health update establishing the cooling tower as the underlying cause of the regional illness outbreak.

Several media organizations including CBC, Global News, Toronto Star, and SSBCrack shared the confirmation from public health officials. The public update specifically named the TTC cooling tower as the root cause of the health emergency in Toronto. Public health officials reaffirmed that the TTC cooling tower remains the proven cause of the illness cluster.