Osaka Expo Suspends Water Shows After Legionella Bacteria Detected

The 2025 World Exposition in Osaka has suspended its water shows after Legionella bacteria levels in the Water Plaza's seawater were found to be 20 times higher than the allowable limit, prompting health concerns and cancellation of fountain shows. Despite earlier detection of the bacteria on May 29 and May 30, the shows initially continued as detailed analyses were pending, but recent tests confirmed the heightened contamination, leading to immediate suspension. Expo organizers are implementing measures such as sanitization, pipe cleaning, and increased seawater circulation to improve water quality before resuming the shows. Additionally, Legionella bacteria were also found at elevated levels near the Quiet Forest area, which was closed quietly for safety without prior public announcement. The Osaka city public health office warned that aerosolized droplets containing Legionella could significantly increase pneumonia risk, leading to the directive to halt water features. While no health issues have been reported so far, the association is conducting further disinfection and safety checks to manage the situation.