If you are looking for an apartment in Tokyo, the earthquake in Tokyo is an important factor to consider when choosing where to live. However, earthquakes are only one part of the picture. Heavy rain, flooding, storm surges, tsunamis, liquefaction, and the condition of the building can all affect how safe and comfortable a property may be during a natural disaster in Tokyo.
It is also important not to judge an area based on just one piece of information. A neighborhood on higher ground may have relatively favorable ground conditions but still experience flooding during an intense rainstorm. At the same time, a low lying area near a major river may have a serious potential flood risk but also benefit from large drainage facilities, floodgates, levees, and other infrastructure built after decades of flood experience.
For anyone renting a home in Tokyo, the most useful question is therefore not simply which ward is the safest. A better question is how the specific area and building are likely to perform during different types of disasters, and what measures are already in place to reduce the risk.
Earthquake Risk in Tokyo
Tokyo is one of the most earthquake prepared cities in the world, but it is not possible to eliminate earthquake risk.
The Tokyo Metropolitan Government states that there is a 70 percent probability of an M7 class earthquake occurring somewhere in the southern Kanto region within the next 30 years. This is a regional probability, not a prediction that an earthquake will definitely strike central Tokyo or a particular ward. However, it shows why Tokyo earthquake risk is worth considering when choosing a home. Tokyo Resilience Project earthquake information provides the official background and current resilience measures.
The Tokyo Metropolitan Government also has a detailed earthquake damage scenario based on an earthquake directly beneath southern central Tokyo. In this scenario, about 60 percent of the 23 ward area could experience seismic intensity of 6 or higher. The estimated damage includes 194,431 damaged buildings, 6,148 deaths, about 2.99 million evacuees, and approximately 4.53 million stranded commuters and others. These figures are planning estimates rather than a prediction of what will happen in a particular earthquake.
A recent real earthquake also shows how a relatively moderate event can affect daily life in Tokyo. On October 7, 2021, an M5.9 earthquake occurred in northwestern Chiba. Adachi Ward recorded a maximum seismic intensity of 5 upper. The Japan Meteorological Agency reported injuries, fires, damage to block walls, railway problems, power outages, elevator entrapments, and people who were unable to return home.
For renters, this is an important reminder. Earthquake safety is not only about whether a building collapses. After a strong earthquake, elevators may stop, water and electricity may be interrupted, trains may stop operating, and roads may become crowded.
Ground conditions matter, but they are not the whole story
Tokyo has different types of ground. Some western and central areas are located on plateaus, while many eastern areas are on lowland formed by rivers and coastal processes.
Ground conditions can affect shaking and liquefaction. Tokyo’s liquefaction map was revised in March 2026 using newer ground data. The Tokyo Metropolitan Government specifically warns that the map shows relative potential and does not guarantee that liquefaction will or will not occur at a particular location. It also notes that even within an area classified as having low potential, local ground conditions can differ. Tokyo Liquefaction Potential Map is therefore best used as one source of information rather than as a final answer.
The same principle applies to the Tokyo Earthquake Risk Map. The current official page provides the Tokyo Earthquake Risk Map for all 23 wards and the Tama area, including an English version. The map considers community level earthquake risk rather than simply ranking entire wards as safe or unsafe.
Heavy Rain and Flooding in Tokyo
Earthquakes often receive more attention, but heavy rain and flooding are also important when choosing a home.
Tokyo has many rivers and densely developed urban areas. Heavy rainfall can cause two different types of flooding. One is river flooding, when a river overflows. The other is internal flooding, when rainfall exceeds the capacity of drainage and sewer systems.
This distinction is important because a property does not have to be directly beside a major river to experience flooding.
Tokyo has been strengthening its flood control systems for many years. The city has built and improved rivers, regulating reservoirs, sewer systems, pumping facilities, floodgates, and other infrastructure. In April 2026, Tokyo revised its flood control plan again, including updates to areas requiring attention and new flood forecasting arrangements for the Zenpukuji River.
Tokyo also provides an official Flood Risk Search Service that allows users to search by address and see expected flood depth and other information. The Tokyo Metropolitan Government also provides an English Flood Control Integrated Information System, which provides information about rainfall and river water levels.
These tools are particularly useful when comparing apartments because flood risk can change significantly within a relatively small area.
The Meguro Example: Higher Ground Does Not Mean No Flood Risk
Meguro is a good example of why it is dangerous to make a simple connection between higher ground and safety.
Much of Meguro is located on the Musashino Plateau. However, the ward is not one uniform plateau. The Meguro River and Nomigawa River have created valleys through the area, and the ward contains both plateau areas and lower areas along rivers.
This geographical difference became particularly important in 2025.
On July 10 and September 11, 2025, heavy rain caused road and greenway flooding and flooding of homes in several parts of Meguro. The September event alone resulted in approximately 400 requests for damage investigations. The ward later stated that the two major rain events in July and September resulted in about 450 cases of flooding affecting the upper or lower levels of homes.
This is a valuable recent example because Meguro is often thought of as a relatively favorable area in terms of ground conditions. Yet intense rainfall still caused significant local flooding.
The response also shows how actual disaster experience can lead to new measures. Following the 2025 flooding, Meguro introduced plans to provide approximately 10 drainage pumps for residents to borrow, increased support for flood barriers, and expanded emergency sandbag storage. The ward increased the subsidy rate for flood barrier installation for individuals from three quarters to nine tenths.
Meguro’s flood hazard map was also updated in March 2026. The current map includes information on river flooding, stormwater flooding, and storm surge, and the ward now provides an English version.
The lesson is not that Meguro is unsafe. The lesson is that even an area with relatively favorable ground conditions can have local flooding problems when rainfall is exceptionally intense.
The Arakawa Example: Low Lying Does Not Automatically Mean More Damage
The opposite example can be found in eastern Tokyo.
Areas around the Arakawa River, including parts of Katsushika and Edogawa, are very low lying. Katsushika is surrounded by several rivers, including the Arakawa, Edogawa, Nakagawa, and Ayasegawa, and about half of the ward is in a zero meter zone. Edogawa has an even larger exposure, with approximately 70 percent of its land area in a zero meter zone.
This clearly means that large-scale flooding remains a serious risk. It would be wrong to describe these areas as generally safe from flooding.
However, there is another side to the story.
Eastern Tokyo has experienced major flooding repeatedly over many decades. As a result, substantial flood control infrastructure has been developed. Katsushika itself explains that floodgates and sewerage improvements have been introduced following repeated flooding, and that large inundation damage has become less frequent in recent years.
One example is the Ayase Drainage Station in Katsushika. The facility has two pumps with a combined drainage capacity of 100 cubic meters per second. During the heavy rain associated with Typhoon No. 2 in June 2023, the station discharged approximately 13.69 million cubic meters of water.
This is exactly why elevation alone is not enough to evaluate flood risk.
A low lying neighborhood may have a serious potential flood risk on a hazard map, but it may also have large scale infrastructure designed specifically to move water away from residential areas. Meanwhile, a higher area may still have local drainage problems during an exceptionally intense rainstorm.
This does not mean that living near Arakawa is safer than living in western Tokyo in every situation. There is no reliable basis for making such a broad statement. The important point is that actual risk depends on both natural conditions and the infrastructure that has been built to respond to them.
River Flooding and Internal Flooding Are Different
When comparing rental properties, it is useful to understand the difference between river flooding and internal flooding.
River flooding occurs when a river exceeds the capacity of its channel or flood control system. In a major event, water can spread over a large area and remain for an extended period.
Internal flooding is different. Very intense rainfall can overwhelm local drains and sewer systems before the water can be carried away. This can cause flooding around roads, entrances, basements, underground parking areas, and lower floors even when a major river has not overflowed.
The 2025 Meguro floods are a useful example of this type of local risk.
For this reason, a property that is several streets away from a river should not automatically be considered free from flood risk. The exact location, road level, drainage system, building entrance, and basement design can all matter.
The current Tokyo Flood Risk Map and address based services allow you to check expected inundation depth and other information for specific locations.
Tsunami and Storm Surge Risk
Tsunami risk in central Tokyo is lower than in many coastal parts of Japan, but it is not zero.
According to the Tokyo Metropolitan Government’s current disaster prevention guide, a major Nankai Trough earthquake could produce maximum tsunami heights of about 2 to 2.6 meters in parts of Tokyo’s 23 wards. The modeled maximum is 2.63 meters in Koto Ward, followed by 2.42 meters in Chuo Ward, 2.38 meters in Shinagawa Ward, 2.37 meters in Minato Ward, 2.25 meters in Ota Ward, and 2.24 meters in Edogawa Ward. The maximum height could arrive in around 1 hour and 20 minutes at the earliest.
For most apartment searches in Tokyo, tsunami is unlikely to be the main factor. However, it becomes more relevant when considering properties close to Tokyo Bay or major rivers.
Storm surge is another issue for coastal areas. Tokyo revised its storm surge inundation maps in January 2025. The current scenario covers 17 wards, with approximately 184 square kilometers identified as potentially inundated and flooding potentially lasting one week or more in some areas.
Therefore, if you are comparing a property near Tokyo Bay with one farther inland, it is worth checking both tsunami and storm surge information rather than looking only at earthquake maps.
What Actually Makes an Area Safer?
The examples of Meguro and the Arakawa area lead to an important conclusion.
There is no single factor that determines whether a neighborhood is safe.
A more useful approach is to look at several factors together.
Ground conditions
Check whether the property is on a plateau, valley, lowland, reclaimed land, or another type of ground. Liquefaction potential can also vary significantly by location.
Flood exposure
Check the expected flood depth, not simply whether the property is inside a colored area on a map.
Past flooding
Recent flooding can reveal local problems that may not be obvious from a general reputation about a ward.
Drainage and flood control infrastructure
Check whether the area benefits from drainage stations, pumping facilities, floodgates, regulating reservoirs, levees, or other infrastructure.
Building condition
The building itself matters enormously during an earthquake. The Tokyo Metropolitan Government’s disaster prevention guide notes that buildings constructed before the introduction of the new earthquake resistance standards in 1981 are generally less resistant to major earthquakes. It also recommends considering seismic assessment and reinforcement where necessary.
Building location within the property
A basement entrance, underground parking area, low entrance, or ground floor apartment may require additional attention in an area with flood risk.
Evacuation options
Consider where you would go during a major earthquake or flood. This is particularly important in very low lying areas where evacuation may need to happen before flooding becomes severe.
The best choice is therefore not necessarily the area with the highest elevation or the lowest elevation. It is the property where the combination of local hazards, building quality, infrastructure, and evacuation options makes sense for your needs.
Tokyo Is Continuing to Strengthen Disaster Protection
Tokyo’s disaster preparedness is not static. The city continues to update its policies based on new data and lessons from recent disasters.
In March 2026, Tokyo revised its earthquake resistant renovation plan to further promote seismic reinforcement of buildings and homes along emergency transport routes.
Tokyo also launched its 2026 earthquake resistance campaign in September 2026, continuing a program that has been running for many years to encourage seismic assessment and reinforcement.
The city is also continuing to strengthen apartment buildings specifically. In August 2026, Tokyo announced a new program to visit approximately 3,700 apartment buildings over the next five years where seismic safety assessments have not yet been completed, with experts such as architects providing support for seismic retrofitting.
Flood protection is also being updated. Tokyo’s 2026 flood control plan was revised in April 2026, while the Zenpukuji River was newly designated for joint flood forecasting by the Tokyo Metropolitan Government and the Japan Meteorological Agency.
These measures do not remove natural disaster risk. They do, however, show why it is important to consider the current infrastructure and recent improvements rather than relying only on historical assumptions about a neighborhood.
What to Check Before Renting an Apartment in Tokyo
If disaster safety is an important part of your apartment search, here is a practical checklist.
- Check the exact address
Do not stop at the ward name. Two properties in the same ward can have very different conditions.
- Check the Tokyo Earthquake Risk Map
Use the official map to understand community level earthquake risk and evacuation information.
- Check liquefaction potential
The latest Tokyo liquefaction map was revised in 2026. Remember that it indicates relative potential rather than guaranteeing what will happen at a particular property.
- Check flood risk
Look at both river flooding and internal flooding. Check expected depth and, where available, the expected duration of flooding.
- Check recent flooding
Search for actual flood incidents around the property. Recent events can provide useful information about local drainage performance.
- Check the building
Ask about the construction year, building structure, and earthquake resistance. For older buildings, ask whether seismic assessment or reinforcement has been carried out.
- Check the floor and entrance
If flood risk exists, consider the position of the apartment, basement areas, parking, electrical equipment, and building entrance.
- Check evacuation options
Find the nearest evacuation area and understand whether the recommended evacuation route changes depending on the type of disaster.
The Tokyo Metropolitan Disaster Prevention Guide Book is also available in English, Chinese and Korean and provides general information about earthquakes, wind and rain damage, tsunami, storm surge, and other disasters.
Conclusion
So, which areas around Tokyo are actually safer?
There is no simple list of wards that can answer that question.
The most useful lesson from recent events is that one piece of information is never enough. Meguro has substantial plateau terrain and relatively favorable ground conditions in many locations, yet heavy rain in 2025 caused around 450 cases of flooding. Eastern areas near the Arakawa are much lower and have serious potential flood exposure, yet decades of investment in drainage and flood control infrastructure have made a real difference in how water is managed.
This is why Tokyo earthquake risk should be considered alongside flood risk, liquefaction, tsunami, storm surge, building condition, and local infrastructure.
A natural disaster in Tokyo can affect one part of a ward very differently from another part of the same ward. The safest choice is therefore not necessarily the neighborhood with the best reputation or the property located at the highest elevation. It is the home where the local risks have been checked carefully and where the building, infrastructure, and evacuation options fit your priorities.
When choosing a rental apartment, take the time to check the exact address rather than relying on a general idea about which side of Tokyo is safer. Looking at official maps together with recent real world examples will give you a much more realistic picture of the area.
Looking for an apartment in Tokyo without a guarantor and want to feel confident about the area you choose? If you are unsure how earthquake, flooding, or other natural disaster risks should affect your apartment search, speaking with an experienced agent can help clarify your options.
At Tokyo Homes, we help international renters find suitable apartments and navigate the process in English and Spanish. We assist throughout the entire rental process, from property search to contract explanations, helping you find a home that fits your lifestyle.
Feel free to contact us for personalized recommendations based on your situation.
