If you prefer distilled water, you may wonder if it can go bad. After all, unlike tap water, distilled water doesn’t contain any minerals or impurities that could potentially spoil over time. So, does distilled water go bad?

The answer is no. Distilled water doesn’t go bad. Distilled water is created by boiling water and then collecting the steam, which is then condensed back into the water. This process removes any impurities, minerals, and bacteria that may have been present in the original water source. Because of this process, it is considered to be pure and free of any contaminants that could cause it to spoil.

However, it’s important to note that while distilled water itself doesn’t go bad, it can become contaminated if it’s stored improperly. If you’re storing it for an extended period of time, it’s best to keep it in a clean, airtight container and in a cool, dark place.

This will help prevent any potential contamination and ensure that it remains pure and safe to drink.

Does distilled water go bad

Does Distilled Water Go Bad?

Distilled water is a type of water that has been purified through a process of distillation. It is free from impurities and minerals, making it ideal for use in laboratory experiments, medical procedures, and even in household appliances such as steam irons and humidifiers.

However, you may be wondering if it can go bad over time. Here are a few things to know:

Physical Changes

Distilled water is a stable substance that does not spoil or rot like food products. However, it can undergo physical changes when exposed to certain conditions.

For instance, if it is stored in a container that is not airtight, it can evaporate over time.

This can cause a decrease in the volume of water and an increase in the concentration of minerals and impurities in the remaining water.

Additionally, if it is stored in a container that is not clean, it can become contaminated with bacteria or other microorganisms. This can cause the water to develop a foul odor or taste, indicating that it is no longer safe to use.

Chemical Changes

Distilled water can also undergo chemical changes over time. For instance, if it is exposed to air, particles from the air can contaminate the water.

Furthermore, if exposed to sunlight or other sources of ultraviolet radiation, it can break down into hydrogen and oxygen gas. However, the degradation and contamination will be much less than the normal water.

Storage and Shelf Life

How to store Distilled water for home appliances?

When storing distilled water for home appliances, keeping it in a cool, dry place is important.

Avoid storing the water in direct sunlight or in a place where it could be exposed to high temperatures. It’s also important to keep the water away from any chemicals or substances that could contaminate it.

Consider storing the water in a sealed container to prevent any dust or particles from getting inside.

Expiration Date

Distilled water does not have an expiration date as long as it is stored properly. However, over time, the water may absorb gases from the air, which can change its taste and odor.

If the water has been stored for a long period of time, it’s best to check it for any changes before using it. If the water has an unusual taste or odor, it’s best to discard it and use a fresh one.

How long is distilled water good for after the expiration date?

If you have a bottle of distilled water that has passed its expiration date, you may wonder if it is still safe to use. It is pure water that has been boiled and condensed, removing any impurities and minerals.

Unlike tap water, it does not contain any bacteria or contaminants, which means it has a longer shelf life.

Typically it has a shelf life of 2-3 years if it is appropriately stored in a cool and dry place, away from direct sunlight.

While the change in taste and odor may not be harmful, it is recommended to use distilled water before its expiration date to ensure its purity and freshness.

Does Distilled Water go bad in Humidifier?

The answer is no, it does not go bad in a humidifier. However, it is essential to remember that other factors can affect the quality of the water and the performance of your humidifier.

One of the main concerns with using tap water in a humidifier is the buildup of minerals and other impurities that can lead to the growth of bacteria and mold.

This is not a problem with distilled water, as it has been purified and contains no minerals or impurities that can cause buildup or growth.

That being said, it is still important to regularly clean your humidifier to prevent the buildup of any contaminants that may be present in the air.

This will help to ensure that your humidifier is working properly and providing clean, healthy air for you and your family.

In addition, it is essential to use the correct type of distilled water in your humidifier. Some types may contain additives or other impurities that can affect the performance of your humidifier.

It is best to use a high-quality, pure-quality product specifically designed for humidifiers.

Potential Risks of Using Bad Distilled Water

Health Risks

Contaminated water can contain harmful microorganisms, such as bacteria, viruses, and parasites, that can cause illnesses such as gastrointestinal infections, fever, and diarrhea.

These microorganisms can also cause serious health problems, especially in people with weakened immune systems, such as infants, elderly people, and those with chronic illnesses.

In addition, bad distilled water can contain harmful chemicals that can cause health problems.

For example, water that has been stored in a plastic container for too long can contain chemicals such as bisphenol A (BPA) and phthalates, which are known to disrupt hormones and cause health problems.

Equipment Damage

Using bad water can also damage your equipment. Water containing minerals, such as calcium and magnesium, can cause mineral buildup in your equipment, leading to clogs, corrosion, and damage to your equipment over time. This buildup can also affect the taste and quality of water.

In addition, using contaminated water can damage your equipment by clogging or damaging the filters, which can decrease the efficiency of your equipment. This can result in higher energy costs and more frequent maintenance and repairs.

Tips to Keep Distilled Water Fresh

Proper Handling

To keep your distilled water fresh, you must handle it properly. Always use clean and sanitized containers to store your distilled water. Ensure the containers are free from dirt, dust, or debris. You can use a funnel to transfer the water from one container to another to avoid any spills or contamination.

Additionally, it is essential to avoid touching the inside of the container or the water with your bare hands. This can introduce bacteria and other contaminants into the water, leading to spoilage.

You can use gloves or a clean cloth to handle the container and the water.

Storage Tips

Proper storage is crucial to keep your distilled water fresh. Store it in a cool, dry, and dark place.

Direct sunlight and heat can cause the water to degrade and spoil faster. You can store the water in a pantry, cupboard, or refrigerator.

If you are storing the water in the refrigerator, ensure the container is tightly sealed to prevent contamination. A

void storing the water near any strong-smelling foods, as the water can absorb the odor and taste of the food.

Frequently Asked Questions

Does distilled water go bad for a nasal rinse?

It is a popular choice for nasal rinsing because it is free from impurities and minerals that can irritate the nasal passages. However, it can still go wrong if it is not stored correctly.

If you use distilled water for nasal rinsing, it is vital to use it within its expiration date and to store it in a cool, dry place away from direct sunlight.

Does distilled water have to be refrigerated after opening?

Distilled water does not need to be refrigerated after opening, but it should be stored in a cool, dry place away from direct sunlight.

If you are using it for drinking or cooking, it must be used within its expiration date and stored in a clean container washed with soap and water.

Can distilled water grow bacteria?

It is free from bacteria and other microorganisms because the distillation process removes all impurities and contaminants.

However, if distilled water is stored in a contaminated container or is not stored correctly, it can become contaminated with bacteria or other microorganisms.

Storing in a clean container and using it within its expiration date is essential to prevent contamination.


In conclusion, distilled water does not go wrong in the traditional sense. It does not spoil or become unsafe to drink. However, it can absorb impurities from its container or the environment, affecting its taste and quality over time.

Therefore, storing distilled water properly in a clean, airtight container away from heat and light is essential.

Additionally, if you notice any changes in your distilled water’s color, odor, or taste, it is best to discard it and use a fresh supply.

Does Jam go bad? Your guide to jam shelf life.

Is natural and artificial vanilla extract gluten-free?

What does Cactus taste like?

 How to Cook Red Lentils: A Simple Guide for Beginners