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What to Do If a Water Leak Occurs in an Apartment Building
2026.02.05
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What to Do If a Water Leak Occurs in an Apartment Building｜Causes, Emergency Measures, and Insurance Coverage Explained
Water leaks in apartment buildings are serious problems that can do more than just damage furniture and appliances. They may also affect units below and cause structural damage to the building itself. To minimize damage, it is essential to understand what actions to take immediately.
This article clearly explains the common causes of water leaks in apartment buildings and how to deal with them.
Causes of Water Leaks in Apartment Buildings
Water leaks in apartments generally fall into two categories: problems with building facilities and resident-related issues.
Water Leaks Caused by Building Facilities or Structure
The most common cause of water leaks in apartment buildings is deterioration of building facilities over time.
・Aging hot water pipes
Older apartment buildings often use copper hot water pipes. After about 20 years, small holes known as pinhole leaks may develop, increasing the risk of leakage. Deteriorated packing materials at pipe joints or loosened screws can also cause leaks.
・Deterioration of faucets
Faucets that have been used for many years may wear out and begin to leak.
・Deterioration of balconies
Cracks in balcony floors can allow rainwater to seep in. This water may travel through the concrete structure and cause leaks in the unit below.
Water Leaks Caused by Resident Negligence
Water leaks caused by residents are less common than those caused by building issues, but they can still occur for the following reasons:
・Detached washing machine hoses
If the water supply or drainage hose of a washing machine is improperly installed or becomes detached during use, a large amount of water can spill onto the floor, causing a leak.
・Leaving water running
Leaving water running on the balcony or forgetting to turn off a shower faucet can result in water leakage.
・Clogged drainage pipes
Kitchen drains are prone to clogging due to oil and food residue, which can cause water to back up and overflow. In toilets, flushing items other than toilet paper such as diapers, tissues, or cleaning wipes can cause blockages and leaks.
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What to Do When a Water Leak Occurs
When a water leak occurs, simply stopping the water supply can prevent further damage. Take immediate emergency action to minimize the impact.
Below are the steps you should take.
・Shut Off the Water Supply Valve
If water will not stop flowing from a faucet, first close the shut-off valve. Typical locations include:
Toilet: Next to the tank or on the floor; for tankless toilets, inside the side panel of the toilet unit
Kitchen / Washbasin: Inside the cabinet under the sink or vanity
If unsure: Inside the metal panel near the entrance, next to the water meter (main valve)
Turn the valve clockwise to stop the water. If the toilet valve is a screw-type, a flathead screwdriver is usually required, but a coin (such as a 10-yen coin) or spoon can be used as a substitute.
・Contact the Property Management Company
Once the water is stopped, contact the property management company or the management association. The response differs depending on whether the cause lies in common facilities or private equipment, so it is best to leave the assessment to the management company and follow their instructions.
・Contact Your Insurance Provider
Water leaks in apartment buildings may be covered by insurance, so once the situation is under control, contact your insurance company.
Personal Liability Insurance:
If your unit causes damage to another unit and you are required to pay compensation, personal liability insurance may help cover the costs. This type of insurance is often included with fire insurance, automobile insurance, or even credit cards, so it is important to check your coverage.
Apartment Building Comprehensive Insurance:
If the leak originates from a common area, it may be covered under the management association’s apartment building comprehensive insurance, specifically the Facility Liability Coverage Rider. Even when it is difficult to determine whether the cause lies in a private or common area, this rider may also cover individual liability in some cases.
Conclusion
When it comes to water leaks in apartment buildings, quick action is crucial. To avoid panic in an emergency, it is recommended to confirm the location of your shut-off valves and keep the contact information of your property management company readily available.
Land Housing welcomes customers looking for newer apartment buildings or properties with well-maintained management. Our experienced staff will support you every step of the way—if you are searching for an apartment in the Suginami area, leave it to Land Housing.
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