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Can Distilled Water Grow Bacteria? Find Out the Truth

Water is essential for life, but not all water is created equal. For instance, most people consider distilled water as the purest option, but does that mean it’s free from bacteria? 

The idea of bacteria growing in distilled water may seem counterintuitive, but it’s a topic both scientists and health enthusiasts argue about. 

In this article, we’ll explore the question: Can distilled water grow bacteria? We’ll delve into the science behind water purification, the potential risks of consuming bacteria in water, and whether or not distilled water is a safe choice for everyday use. So, let’s dive in and find out the truth about distilled water and bacteria.

What Is Distilled Water?

Distilled water is a type of purified water that has undergone a process called distillation. This process involves boiling the water and then condensing the steam back in. The result is water free from most impurities, including minerals, bacteria, and other contaminants.

Distillation removes impurities from the liquid by separating them from the water molecules during boiling. Since the impurities have a higher boiling point than water, they’re left behind. The rising steam is then collected and cooled, turning it back into liquid water. This process effectively removes most impurities from the water, including minerals like calcium and magnesium, bacteria, and viruses.

Scientific experiments and medical procedures often require distilled water to ensure their success. Many household appliances like steam irons and humidifiers should also be used with distilled water to prevent mineral buildup that can damage the equipment. And, finally, some people choose to drink distilled water to avoid potentially harmful contaminants found in tap water. But is that the best decision? Let’s find out.

Can Distilled Water Grow Bacteria?

Many specialists debate whether distilled water can grow bacteria, and there are good reasons why there’s no one answer to this question. 

For starters, distilled water lacks the minerals and nutrients that bacteria need to thrive. So, bacteria struggle to grow and reproduce in it. That said, bacteria can grow in distilled water under some specific consequences. For example, if you don’t store the water properly or if it’s contaminated during distillation, bacteria may stick and multiply. Also, bacteria that are particularly hardy or adapted to low-nutrient environments may be able to survive in distilled water for longer periods.

And while distilled water itself may not contain bacteria, it can still get contaminated by external sources. For instance, if you store it in a container that hasn’t been properly sterilized, bacteria from the container may enter the water and grow. Similarly, if you use distilled water to clean a surface that’s already contaminated, the water may get bacteria as well.

To sum up, while distilled water is generally a sterile and bacteria-free substance, that doesn’t make it immune to contamination. As with all water sources, it’s important to take proper precautions to ensure that the distilled water remains free from bacteria and safe for use.

Is Distilled Water Safe to Drink?

Distilled water is generally safe to drink, as it undergoes a process of distillation that removes most impurities, including bacteria and viruses. And while it has its benefits, there are also some potential risks and drawbacks to consider. We’ll take a closer look at both:

Distilled Water Benefits

Distilled water has some potential benefits that may make it a suitable choice for some people. Here is the good news:

  • Purity: Distilled water is free from bacteria, viruses, and other contaminants.
  • Reduced Exposure to Contaminants: Drinking distilled water can help to reduce your exposure to potentially harmful contaminants that may be present in tap water, such as lead, chlorine, and pesticides. It’s a valid concern since more than 40 million Americans drink contaminated water.
  • Reduced Mineral Intake: Distilled water is free from minerals and while they’re an essential part of a healthy diet, some people may need to limit their intake of sodium or calcium. 
  • Reduced Risk of Mineral Buildup: Hard water, which is high in minerals, can cause mineral buildup in pipes, appliances, and other equipment. In this sense, distilled water can help to reduce the risk of mineral buildup in your home.
  • Potential Health Benefits: While the research is limited, some studies have suggested that drinking distilled water may have certain health benefits, such as improved digestion.

While there are some potential benefits to drinking distilled water, it may not be the best choice for everyone. As with any dietary or lifestyle choice, you must consider your individual needs and consult with a healthcare professional before making any significant changes.

distilled water side effects

Drinking Distilled Water Side Effects

While distilled water is generally safe to drink, you might experience some side effects with prolonged or excessive consumption. Here are a few drawbacks of drinking distilled water:

  • Mineral Deficiencies: The main concern with drinking distilled water is that it lacks the minerals that are naturally present in water. This may not be a significant problem if you drink it occasionally, but drinking only distilled water over a prolonged period can lead to mineral deficiencies and other health problems.
  • Electrolyte imbalances: Distilled water may not replenish the body’s electrolytes effectively. In some cases, this can lead to symptoms like muscle cramps, weakness, and irregular heartbeat.
  • Increased thirst: You may find that drinking distilled water increases your thirst, as it lacks the subtle flavors and minerals in regular water.
  • Different Taste: Some people say that distilled water tastes flat or unpalatable, so it’s not as tastier.

These side effects come with prolonged or excessive consumption of distilled water. If you drink it occasionally, distilled water is generally safe and might even be good for you.

How Long Is Distilled Water Good After Opening?

Generally, bottled distilled water can be good for up to a week after opening. But this depends on other factors.

The shelf life of distilled water is indefinite when stored properly in a sealed container. Unlike other spring or tap water, distilled water doesn’t contain any bacteria or other organisms that can spoil its quality. As long as the container remains sealed, the water should be safe to use.

If you open the container with distilled water, you may expose the liquid to bacteria and other contaminants that can spoil it over time. That’s why you should store the water in a clean, sealed container and keep it in a cool, dark place away from direct sunlight. Also, you should avoid touching the inside of the container when dispensing the water, as this can introduce bacteria into it. 

If you plan on drinking distilled water regularly and keeping it in a reusable bottle, keep in mind that you should clean your reusable water bottle regularly.

Why Does Distilled Water Taste Bad?

Many people describe the taste of distilled water as bland or unpleasant. And there’s more than one possible explanation for that:

  • Lack of Minerals: Minerals in regular water usually give it a slightly sweet or savory taste, which distilled water lacks.
  • Carbon Dioxide Absorption: Distilled water can absorb carbon dioxide from the air over time. When that happens, it forms carbonic acid, which can give the water a slightly sour or acidic taste.
  • Taste Sensitivity: If distilled water tastes bad to you, you may be more sensitive to it. This could be due to differences in your taste buds, or due to your exposure to other types of water or beverages.

Generally, the taste of distilled water is down to personal preference. While some people may find it unappealing, others may like its clean, neutral taste. If you dislike the taste of distilled water, but you’d still like to drink it, you can try adding a slice of lemon or a pinch of salt to improve the taste.

How to Store Opened Distilled Water

If you want to store opened distilled water properly, follow these steps:

  1. Use a clean, airtight container: Once you’ve opened the distilled water, transfer the remaining liquid to a clean, airtight container. This will help to prevent contamination from bacteria and other microorganisms.
  2. Store in a cool, dark place: Distilled water should remain in a cool, dark place away from direct sunlight and heat. Otherwise, the water can get contaminated.
  3. Avoid touching the inside of the container: This can introduce bacteria and other contaminants into the water.
  4. Use within a week: Although distilled water can last indefinitely if stored properly, it’s best to use it within a week to ensure its quality and purity.
  5. Check for signs of spoilage: This can include cloudiness, an off taste or odor, or the presence of sediment. If the water appears to be spoiled in any way, it’s best to discard it.

By following these tips, you can ensure that your opened distilled water remains safe and pure for as long as possible. If you have any concerns about its quality, consider purchasing a water testing kit.

Final Thoughts

While distilled water may not contain the minerals and nutrients found in regular water, it still has its benefits. For instance, there are numerous uses for distilled water like medical applications or household cleaning and maintenance. 

But can distilled water grow bacteria? Fear not, as we’ve learned that distilled water won’t grow bacteria if stored properly. Still, remember that excessive consumption of distilled water can cause certain problems. If you plan to start drinking distilled water regularly, you should first consult with a healthcare professional.


How long can bacteria survive in distilled water?

Bacteria struggle to survive in distilled water due to its lack of minerals and nutrients. While some may survive for a short time, they’ll eventually die off because the water won’t support their growth. That’s why distilled water is a safe and pure option for different purposes.

Can mold live in distilled water?

No, mold requires a nutrient-rich environment to thrive, and distilled water doesn’t provide these essential elements.

How do you stop bacteria from growing in water?

To prevent bacterial growth in water, you should store it properly, maintain cleanliness, and limit exposure to contaminants. In short, use a clean container, keep the water covered, and avoid prolonged exposure to sunlight and high temperatures.

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