What is the location of the flooding?
As of September 22, 2026, Typhoon Dujuan has brought torrential rain and flooding to eastern Japan, particularly across the Kanto region.
The storm has moved northeast away from the coast, but heavy rainfall has caused flooded roads, landslides and widespread disruption around Tokyo. Oshima in the Izu Islands and areas of Chiba and Kanagawa have recorded significant impacts (1).
Which cities or areas are affected by the flooding?
Flooding, landslides and heavy rainfall have affected the following areas:
What is the current containment status of the flooding?
Flood recovery and cleanup operations are underway as Typhoon Dujuan moves away from Japan. Nearly 50,000 households remain without electricity, while landslides and flooding have disrupted roads and rail services (2).
Emergency crews continue clearing debris and responding to affected communities, although most heavy rain and landslide warnings have been downgraded as conditions improve (3).
Are there any evacuation orders or alerts in place?
More than 1.6 million residents in and around Tokyo were urged to evacuate as the storm approached, while some areas received evacuation advisories.
Japan's highest-level landslide emergency warning was issued for Oshima, and flood, landslide and river warnings were issued across parts of eastern Japan. Residents in affected areas are advised to follow local authorities' instructions and avoid flooded or low-lying areas (4).
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How can I protect myself from mold after flooding?
It’s important to take steps to prevent mold after a flood.
- Before entering a flooded area, make sure it is safe and free from electrical hazards or structural damage.
- Use protective gear: wear gloves, goggles, and a KN95/FFP2 mask to minimize exposure to mold spores.
- If there is still standing water, remove it as quickly as possible. Use pumps, wet-dry vacuums, or buckets to extract the water.
- Open windows and doors to facilitate air circulation and use fans, dehumidifiers, and HVAC systems to help dry the space. This step is crucial within the first 24-48 hours after flooding to prevent mold growth.
- Remove and discard any items that have been severely damaged by floodwater and cannot be thoroughly cleaned and dried. This includes carpets, upholstered furniture, mattresses, and any other porous materials.
- Thoroughly clean all hard surfaces with a detergent or cleaner suitable for mold remediation. Use a solution of 1.5 cups of bleach mixed with one gallon of water to disinfect nonporous surfaces. Never mix bleach with ammonia or other cleaning products, as the fumes are toxic.
- Maintain an indoor relative humidity (RH) of 35-50%. High humidity promotes mold growth, so consider using dehumidifiers in damp areas.
- Run a high-performance air purifier for mold, both during and after the mold removal work.
- If the flooding and mold damage are extensive, consider contacting professionals specializing in mold remediation to ensure proper cleanup and restoration.
Remember, mold can pose health risks, so it's important to take these steps promptly and thoroughly. If you experience persistent mold-related health issues or have concerns about extensive mold growth, consult with a medical professional or a mold remediation specialist.
