Key Facts
• May 30–June 7: Seawater at Water Plaza tested using rapid PCR method.
• June 4: Water shows suspended after Legionella levels exceeded guidelines.
• June 7: Cultivation method showed Legionella levels below detection limits.
• June 19: No harmful Legionella bacteria detected in Water Plaza seawater.
• June 20: Expo Association announced water quality improvements and ongoing consultations.
• ‘Water and Air Symphony’ (day) and ‘Blue and Night Rainbow Parade’ (night) shows affected.
• Central pond in ‘Forest of Silence’ remains closed to protect aquatic life.
• Osaka City Health Department involved in determining reopening timeline.
Summary
The Osaka-Kansai Expo’s popular water shows, including ‘Water and Air Symphony’ and ‘Blue and Night Rainbow Parade,’ were suspended on June 4 after Legionella bacteria levels in the Water Plaza seawater exceeded guidelines. Subsequent tests using a more precise cultivation method revealed levels below detection limits, with no harmful bacteria detected as of June 19. The Expo Association prioritized safety, halting the shows and improving water quality. Consultations with the Osaka City Health Department are ongoing to determine the reopening timeline. Meanwhile, the central pond in the ‘Forest of Silence’ remains closed to protect aquatic life, despite other areas showing improved conditions. Efforts continue to ensure public safety and environmental protection.
