Toronto Health Officials Link Legionnaires’ Disease Outbreak to TTC Cooling Tower
Health officials in Toronto have pinpointed a Toronto Transit Commission (TTC) cooling tower as the source of a recent flare-up of legionnaires’ disease in the city. The investigation was prompted by the emergence of six confirmed cases clustered within a one-kilometre radius of Bathurst and Dupont streets.
Following thorough analysis, the cooling tower located at the TTC’s Hillcrest Complex was identified as the origin of the outbreak, with samples from the tower matching those obtained from a legionnaires’ case. Additionally, a potential connection was established between this incident and five other legionnaires’ disease cases at Castleview Wychwood Towers, a local long-term care facility.
Collaborating closely with health authorities, the TTC swiftly shut down the implicated cooling equipment to contain the spread of the disease. Legionnaires’ disease, caused by legionella bacteria commonly present in water sources, can also lurk in hot tubs, sprinkler systems, humidifiers, and ornamental fountains.
Transmission occurs through inhaling small water droplets carrying the bacteria, emphasizing the need for caution in water-related environments. Notably, officials have reassured the public that legionnaires’ disease is not transmissible between individuals, and the overall risk remains minimal.
Published by The Canadian Press on August 25, 2026.
