Heavy Rain in Japan: Can You Take a Bath or Do Laundry?

It has been raining heavily for days, and the whole house feels damp.

I was thinking about taking a bath just to feel comfortable again when a question suddenly crossed my mind: with this much rain falling outside, is it okay to use water at home as usual?

Can I take a bath and drain the tub afterward? Should I run the washing machine? What about the toilet and kitchen sink?

Bath and laundry at home during heavy rain in Japan

The answer is not simply “stop using water.”

During very heavy rain, some local governments in Japan ask residents to temporarily reduce household wastewater. This can mean waiting before draining a full bathtub, postponing laundry, or simply using a little less water until the heaviest rain has passed.

Before changing your whole routine, check your toilet and drains. If they are making unusual gurgling sounds, draining slowly, or showing signs of backflow, avoid sending large amounts of water down the drains until conditions improve.

Even if everything seems normal, it is worth checking whether your city or ward has issued a local request to reduce wastewater.

Why Can Heavy Rain Affect Your Drains?

Before looking into this, I had never really connected the rain outside with taking a bath or doing laundry inside.

But whether the water comes from the bath, washing machine, kitchen, or toilet, that used water eventually has to go somewhere.

During intense or prolonged rainfall, large amounts of rainwater can enter sewer pipes. This can make it harder for household wastewater to flow normally.

Air inside the pipes may also be pushed back toward homes, which can cause toilets and drains to make strange gurgling or bubbling sounds.

That does not automatically mean your toilet or drain is clogged. If heavy rain is the cause, the problem may improve as the weather settles.

Can You Take a Bath During Heavy Rain?

Heavy rain does not automatically mean you have to skip your bath.

The more useful questions are whether your drains are behaving normally and whether your local government is asking residents to reduce wastewater.

There is also a difference between taking a bath and draining the bathwater afterward.

If you fill the tub and soak in it, you do not necessarily have to release all that water immediately. During severe rain, some municipalities in Japan advise residents to leave bathwater in the tub and drain it after the rain has eased.

I found this particularly useful because I had originally been wondering whether I should take a bath at all.

The answer was more practical than I expected: depending on the situation, the bigger concern may be what happens to the bathwater afterward.

If your toilet or bathroom drain is already behaving unusually, however, it is better to reduce unnecessary water use and wait.

My Laundry Is Waiting for the Rain to Stop Too

Laundry has become a very real part of this question in my house.

Normally, rain does not stop me from doing laundry. I still use the washing machine on an ordinary rainy day. But when the weather becomes severe, with extremely heavy rain or a typhoon, I prefer to wait if I can.

That is what I have been doing this time. The rain has been unusually heavy, so the laundry has been piling up. The rain is finally expected to stop tomorrow, and I am already planning to get the washing machine going once conditions improve.

It is inconvenient, but it also made me wonder whether waiting actually makes a difference.

A washing machine sends a considerable amount of used water into the household drainage system during a cycle. During extremely heavy rain, some municipalities in Japan ask residents to postpone laundry when possible.

This does not mean you need to avoid using the washing machine whenever it rains. A normal rainy day and severe weather that may affect local drainage are not the same thing.

If the laundry can wait and the sewer system is already dealing with unusually heavy rainfall, postponing one load is a simple way to temporarily reduce household wastewater.

In my case, another day of waiting is manageable. Tomorrow, though, that washing machine is going to be busy.

Household water use to consider during very heavy rain

What About the Toilet, Kitchen, and Shower?

You do not need to stop using every tap in the house just because there is a downpour.

Normal household life still has to continue.

Using the toilet when you need it is very different from deciding whether to empty a bathtub full of water or run another load of laundry.

The same idea applies in the kitchen. You can still prepare food and wash what you need, but during exceptionally heavy rain, avoiding unnecessary running water can help reduce the amount going into the sewer system.

A shower also sends water down the drain, so the condition of your bathroom drain still matters.

The goal is not to become afraid of using water. It is simply to avoid unnecessary large amounts of wastewater when local conditions are already difficult.

Gurgling or Slow Drains? These Signs Matter

Signs of drainage problems during heavy rain

Pay more attention if your toilet or drains suddenly start behaving differently during heavy rain.

Repeated gurgling sounds, unusually slow drainage, rising toilet water, or water pushing back up through a drain can indicate that the drainage system is under pressure.

If that happens, avoid unnecessary water use and wait for conditions to improve.

If the rain stops but the drainage problem continues, heavy rain may not be the only cause. A blockage or another problem with the home’s drainage system may need to be checked separately.

What Is a “Suinou” Water Bag?

While checking Japanese municipal guidance, I came across a useful term that foreigners living in Japan may not know: 水のう (suinou).

How to make a simple water bag for temporary drain backflow protection

A suinou is a water-filled plastic bag that can be used as a temporary measure to help reduce backflow from a toilet or drain.

A simple version can be made by placing one large plastic bag inside another, filling it partway with water, removing excess air, and tying it securely.

The weight of the bag can then be used to cover a toilet or drain where water or air is pushing upward.

Japanese municipalities may recommend this method for toilets, bathroom drains, and washing-machine drains during heavy rain.

A suinou is only a temporary measure. If water is already entering the home or flooding is creating a dangerous situation, personal safety comes first.

How to Check Local Sewer Information in Japan

Heavy-rain conditions are not the same everywhere in Japan.

Your drains may appear normal while your city is still asking residents to reduce wastewater because of conditions in the local sewer system.

During a typhoon or prolonged downpour, check your city or ward’s official website.

If English searches do not bring up useful information, try adding your city name to one of these Japanese searches:

大雨 下水道 — heavy rain + sewer system

大雨 排水 — heavy rain + drainage

These searches can lead you directly to local government notices that may be difficult to find in English.

If you do not read much Japanese, browser translation can help you understand the main instructions.

Local guidance should take priority because conditions can differ from one area to another.

The Bottom Line

Heavy rain in Japan does not automatically mean you have to stop taking baths, doing laundry, using the toilet, or cooking.

What changes during an extreme downpour is how carefully you should think about the water leaving your home.

If your drains are behaving unusually, reduce unnecessary water use and give the system time to recover. Even when everything looks normal, your municipality may ask residents to postpone laundry, conserve water, or wait before draining a full bathtub.

For me, this started with two very ordinary problems: I wanted a bath because the house felt damp, and I had a growing pile of laundry that needed washing.

Now the rule I remember is much simpler than I expected: heavy rain does not always mean “don’t use water.” It means paying a little more attention to how much water you send down the drain, and when.

References

Tsukuba City — Reducing Wastewater Discharge During Heavy Rain

Natori City — What to Do When Toilets Gurgle or Drain Slowly During Heavy Rain

Abiko City — Drainage Problems During Heavy Rain

Akishima City — Preventing Drain Backflow During Heavy Rain

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