Author: Dennis Reed

Do You Have to Use Distilled Water in a Humidifier?

Introduction:

What is the problem with not using distilled water in a humidifier? The truth is you can get away with using tap water in a humidifier or a CPAP machine for a while. But eventually the mineral content will become a problem for your humidifier or CPAP machine.

This is true story:

Recently my wife had an issue with her CPAP machine. if you’re not familiar with what a CPAP machine is, it’s a device that helps you breathe while you sleep. It comes with a mask that you put on, that basically pushes oxygen into your lungs.

And just like a humidifier they are required to be filled with water.

As the story goes, this specific CPAP machine that my wife was using stopped working.

With some aggravation, She immediately she got a hold of the manufacturer who agreed that they would send a shipping label for her to send it in to get it fixed.

And just like they promised, the whole transaction went smoothly and they repaired the device and send it right back.

The invoice that was included in the package specified the problem:

“unit was clogged up, thoroughly cleaned and working properly again. Solution, switch to distilled water”

A lot of hassle and money to get a CPAP machine repaired to find out that she was using tap water to fill it, and the minerals in the water had eventually stopped up the machine where it would not function.

So do you have to use distilled water in a humidifier? No it will work with tap water, But eventually you may wish you would have.

If you’ve run out of distilled water: using tap or bottled water once or twice usually won’t cause immediate damage. The bigger issues tend to show up over time — mineral buildup inside the unit and fine residue settling around the room.

If you notice a chalky film on surfaces or dust forming near your humidifier, that’s often the first sign minerals are being dispersed into the air. We explain exactly why this happens — and what to do about it — in our guide to white dust from humidifiers.

Water Types for Humidifiers

Distilled Water For Humidifiers? Why is it Best?

If you don’t already keep distilled water on hand, many people simply add a few gallons of distilled water for humidifiers to their regular household shopping. It’s inexpensive and helps avoid mineral buildup from the start.

Distilled water is the best water to use in a humidifier because of its low mineral content. Because of the process it goes through, it has the lowest mineral content of any type of water.

This is important for a few reasons:

1.The mineral content in most drinking water will eventually shorten the life of your humidifier and lower the output by stopping it up.

2. The minerals in most water are what is responsible for the dust that you see gathering around your humidifier.

Since dust is one of the primary reasons that your skin gets dried out in dry weather, using water with a lot of mineral content in a humidifier can produce the opposite effect than intended.

3. The higher the mineral content in the water that you use in a humidifier, the more likely, the growth of mold and bacteria in the water.

Can I Use Regular Water in a Humidifier?

Is it dangerous to use regular tap water in a humidifier. No.

Now more so than drinking tap water.

And though most of us probably drink bottled water more regularly than tap water, anytime you purchase tea or coffee from a restaurant, it’s going to be made with tap water.

So whether we believe that tap water is good to drink or not, most of us are most likely consuming it on a regular basis.

The issue with tap water being used in a humidifier are primarily about the high mineral content in tap water.

The higher the mineral content in the water that you use in a humidifier, the more likely to get stopped up and not work properly.

And it’s the mineral content in the water that creates the white dust that accumulates on the humidifier and around it.

Since dry skin is one of the primary reasons people purchase humidifiers and dust is one of the primary things that pulls the moisture out of your skin,
operating a humidifier that is creating more dust by using tap water somewhat counterproductive.

Another issue with tap water is that the minerals in the water have more of a chance to become food for mold to be able to take root inside of a humidifier.

Finally, tap water has a whole list of chemicals that are there “for our own good apparently” that you do not necessarily want to breathe in as part of the moisture content in your air.

So even though tap water is definitely not the best option for a humidifier, the issues with it are not immediately harmful or dangerous. And if that’s all you have at your disposal, you know the risk,

And it’s not like you can’t clean your humidifier extra well after you use tap water in it. And as for the dust, keep it wiped up.

Many ultrasonic humidifiers — including popular models from Levoit and Honeywell — will still run on tap water, but mineral buildup and white dust tend to appear much faster compared to using distilled water.

Quick note: ultrasonic humidifiers show the “white dust” problem the most

If you have an ultrasonic humidifier, it can aerosolize minerals in hard tap water, which is why you may notice white dust on furniture. Evaporative/wick humidifiers usually have less of that issue, but they still get mineral buildup over time.

What other water besides distilled can you use in a humidifier?

Bottled?

Bottled water has a lot of minerals in it that could be an eventual problem for your humidifier. Even the water that is produced by using reverse osmosis has the disclaimer on it that minerals are added back to make it more consumable.

It’s a better option than tap water but it still has its fall backs.

Boiled water?

Boiling water causes the minerals in the water to settle. So if you had a way to separate the settlement so that it did not make it into the humidifier with the rest of the water, it would make a great choice.
The problem is, making that happen. Not exactly easy to do.

But there is absolutely one type of water you should never run your humidifier with.

Stagnant water

Water that has been allowed to sit inside of your humidifier is going to be moldy and full of germs and bacteria.

And when you turn that humidifier on with that stagnant water still in it, the germs and bacteria in that water will become part of the air that you are breathing.

Now talk about having the opposite effect than you intended, the humidifier that was supposed to make you feel better, has basically become a weapon of germ warfare.

Legionnaires’ disease and humidifier lung are harsh reminders of what can happen when humidifiers and evaporative coolers are allowed to sit with moldy water.
You can easily look up the symptoms of mold allergies and discover that they look very closely like the symptoms of the flu.

So if you think that the humidifier in your house may be making you sick, you may be right. And you should take it seriously.

Fortunately, Humidifiers have become pretty sophisticated devices and many of them have ways of helping control mold growth.

If you’re in the market for a new humidifier, it’s well worth it to look into some of the features that can help reduce the chance mold and bacteria growing in your humidifier and becoming part of the air you’re breathing.

There are additives that you can place in your humidifier that can reduce the chances of a humidifier developing bacteria too.

Maintenance Tips for Humidifiers

Proper maintenance is crucial for ensuring your humidifier operates efficiently and safely, extending its lifespan and improving indoor air quality. Regardless of the water type you choose, here are some essential maintenance tips to keep your humidifier in top condition:

• Regular Cleaning: Clean your humidifier regularly to prevent the buildup of minerals and the growth of mold and bacteria. Depending on usage, a thorough cleaning every 1-2 weeks is recommended.
  • Empty the water tank, dismantle the parts, and clean them with mild soap and warm water.
  • Use a soft-bristled brush to scrub away any mineral deposits or buildup.
• Use Distilled Water When Possible: While not always necessary, using distilled water can significantly reduce mineral buildup and the need for frequent descaling, making regular maintenance easier.Some humidifiers also support optional demineralization cartridges, which can help reduce white dust when distilled water isn’t available — though regular cleaning is still important.
• Descale and Disinfect: Even with distilled water, it’s important to descale and disinfect your humidifier to remove any mineral deposits and kill germs that could be harmful.
  • Descale the humidifier by using a mixture of white vinegar and water. Let it sit for at least 30 minutes, then rinse thoroughly.
  • Disinfect the water tank and other parts by using a diluted bleach solution (1 teaspoon of bleach per gallon of water) or hydrogen peroxide. Rinse all parts thoroughly after disinfection to ensure no chemicals remain.
• Change Filters Regularly: If your humidifier has a filter, follow the manufacturer’s recommendations for changing it. Filters can harbor mold and bacteria, reducing air quality and humidifier efficiency.
• Dry Before Storing: If you plan to store the humidifier for an extended period, ensure it is completely dry to prevent mold and bacteria growth. Disassemble the parts, clean them thoroughly, and let them air dry before storing.
• Monitor Humidity Levels: Use a hygrometer to monitor room humidity levels, maintaining them within a comfortable range of 30-50%. This helps prevent problems associated with over-humidification, such as mold growth and condensation on windows.
• Check for Leaks and Damages: Regularly inspect your humidifier for any signs of leaks or damage. Addressing these issues promptly can prevent further damage and potential water damage to your surroundings.

Pros and Cons of Using Distilled Water in Humidifiers

Summary

Do you have to put distilled water in a humidifier?

No. Even though distilled water is the best water to keep your machine from stopping up and extending the life of your humidifier,
A humidifier will work without it.

If mineral residue or dust starts appearing, that’s usually the point where switching water types or adding filtration makes the biggest difference.

And though everyone agrees that tap water is the worst water you want to use in a humidifier, you can use it without having to worry about it being dangerous to you.

The main issue with tap water is that it is filled with minerals that can stop up your humidifier. And those minerals can and will produce humidifier dust on your unit and around it.

If tap water is what you have available, then do your best to keep your humidifier clean with vinegar and keep the dust around the humidifier wiped up so it does not become part of the air quality.

Arguably, The most important thing to remember when using a humidifier is to never run it with stagnant moldy water in it.

Mold in your air can produce very similar symptoms to the flu. Pneumonia, humidifier lung, and legionnaires are harsh reminders of what can happen when mold is allowed to grow in water unchecked.

We cover all the common questions and solutions in our full humidifier guide.

Where to Put a Humidifier When You’re Sick

Experts recommend cool mist humidifiers near your bed (avoiding direct mist) for congestion & dry coughs. Read on for specifics!

According to the Mayo Clinic, a cool mist humidifier works by increasing moisture in the air, which can soothe irritated respiratory passages and make it easier to expel mucus. The moist air also prevents tissues in your nose and throat from drying out, which can worsen coughs and sore throats.

When you’re battling a cold, cough, or congestion, using a humidifier can be a game-changer for your comfort and recovery. Here’s everything you need to know about choosing and using a humidifier to ease your symptoms.

What Type of Humidifier Is Best for Coughing and Congestion?

For coughing and congestion, cool mist humidifiers are generally recommended. They add moisture to the air without heating it, making them safer around children and during sleep. Cool mist options like ultrasonic or evaporative humidifiers are ideal for easing respiratory symptoms.

What to Set Your Humidifier At When Sick

The ideal humidity level in your room should be between 30-50%. Higher levels can promote mold and dust mites, while lower levels might not provide enough relief. Use a hygrometer to monitor and adjust your humidifier accordingly, aiming for the higher end of this range when dealing with congestion.

How Close Should a Humidifier Be to Your Face?

It’s best to place the humidifier about 3-5 feet away from your bed. This distance allows the mist to disperse evenly throughout the room without directly impacting your face, which can cause discomfort or excessive moisture.

Does Sleeping with a Humidifier Help a Cold?

Yes, sleeping with a humidifier can help alleviate cold symptoms. The added moisture in the air can soothe irritated tissues in your throat and nasal passages, making it easier to breathe and promoting better sleep.

When running a humidifier overnight, water quality and humidity level matter just as much as placement. Using mineral-heavy water or letting humidity climb too high can lead to residue, irritation, or discomfort by morning — especially when you’re already sick.

If symptoms seem worse after overnight use, it’s often tied to water choice or buildup rather than the humidifier itself. We explain when distilled water really makes a difference (and when tap water is usually okay) in our guide to using distilled water in a humidifier.

Does Sleeping with a Humidifier Help with Congestion?

Absolutely. A humidifier can help loosen mucus, making it easier to clear congestion. The moist air also prevents the drying out of nasal passages, reducing the stuffy feeling that comes with a cold or flu.

Best Humidifier for Coughing at Night

When choosing a humidifier for nighttime cough relief, look for:

• Quiet operation: Ensures your sleep isn’t disturbed.
• Cool mist feature: Safer and more comfortable for continuous use.
• Adjustable settings: Allows you to control the output for optimal comfort.
• Easy maintenance: Reduces the risk of bacteria and mold growth.

Ultrasonic cool mist humidifiers are often favored for their quiet operation and fine mist, making them excellent for use during sleep.

How Boiling Water Works as a DIY Humidifier

To use boiling water as a humidifier, simply boil water on your stove or use an electric kettle, then carefully transfer the hot water to a heat-resistant bowl or pot. Place it in a safe location in your desired room. As the water cools and evaporates, it will add moisture to the air, acting as a simple and effective DIY humidifier.

Introduction

Did you know that you can use boiling water as a humidifier? As a kid growing up in the country of the plains of Texas, and although I didn’t know it then, I was privy to a lot of homegrown methods of getting things done, that even in my lifetime have gone to the wayside.

One of those methods that has kind of got forgotten but I remember quite well is the art of using boiling water as a DIY humidifier.

The old house that my grandparents owned had the furnace style that was kept beneath the floor and worked by sending heat into the house through metal vents that looked like a 2 x 3 grill.

I remember if you stood on it too long, it would melt your shoes.

I also remember my grandmother putting a pot of water on that furnace grill.

I didn’t know what that pot of water was nor did I have any interest in that as a kid.

But now I know she was using that pot of water as a humidifier. The furnace underneath the house was so hot that it was not only melting shoes, it was drying out the air and causing all kinds of havoc with dried out noses, throats, and lips. Putting a pot of water on the furnace was a way of offsetting the dryness in the air and relieving those symptoms.
See our full humidifier guide.

Boiling water as a DIY humidifier

is a trick that is as old as the hills you might say.

If you were to compare it to today’s humidifiers, the method of boiling water as a humidifier would be considered a vaporizer if you were to buy it at a big box store.

Vaporizers boil water to moisturize the air with steam. Boiling water on the stove is the exact same thing.

The only difference is the vaporizers usually come with some sort of medicinal additive like Vicks to help with congestion and breaking up phlegm.

Important Side Note: Boiling Water and Your Humidifier

As we explore various DIY humidifier methods, it’s crucial to clarify a common misconception. While boiling water can be used as a makeshift humidifier in the ways described above, it is not advisable to pour boiling water directly into a standard humidifier.

Humidifiers are designed to operate safely within specific parameters, and introducing boiling water can damage the unit, void warranties, and pose serious safety risks, including the potential for burns or causing the humidifier to malfunction.

Add Some Essential Oils

But there’s nothing saying that you can’t add essential oils to your boiling water and get a similar, if not better breathing effect.

Some of the most common essential oils for adding to a vaporizer, Diffuser, or a DIY humidifier are:

• Eucalyptus
• Peppermint
• Lavender
• Clove
• Rosemary
• Oregano
• Ginger

1.Eucalyptus oil

Next to putting Vicks rub all over your chest, eucalyptus oil is one of the most popular ways of combating breathing problems. It is known for its anti-inflammatory agents that help minimize respiratory flare-ups including bronchitis and asthma.

2.Peppermint oil

Peppermint is a lot like eucalyptus, it not only has a similar smell, it also has many of the antimicrobial properties that help ward off bacteria and viruses that eucalyptus oil has.

3.Lavender oil

If you ever do any research on what kind of things you can do to help you relax, lavender essential oils usually appear at the top. Lavender oil is known for its ability to reduce anxiety and promote a sense of calmness. Lavender oil is an excellent addition to your do-it-yourself humidifier.

4.Clove oil

Clover oil is another essential oil that is known for its benefits related to respiratory conditions. When inhaled, clove oil is a deterrent to allergy and asthma triggers.

5.Rosemary

Rosemary oil has a very unique smell that is great to add to your homemade vaporizer. Not only does it smell great, it contains an ingredient called “Cineole”

According to the US National Library of Medicine, Cineole reduces cough frequency after 4 days.

5.Oregano

Oregano oil in your homemade humidifier will help fight off a cold bug. It’s true. Oregano oil contains three ingredients that are known to fight off bacteria. Carvacrol, Thymol, and Rosmarinic acid, all found in oregano oil, create a natural antibiotic and fungicide.

6.Ginger

Ginger oil has been shown to effectively decrease the symptoms of a cold. If you got the sniffles, adding Ginger oil to your boiling water humidifier is an excellent way to open up your airways and make it easier to breathe in general.

Alternative DIY Humidification Methods

A bowl of water in front of a fan

You can get a good DIY cool mist humidifier effect by placing a bowl of water in front of a fan.

That is essentially what an evaporative cooler does. It blows a fan across water to add cool air to the house.

By

putting a bowl of water in front of a fan, the fan helps evaporate the water and moisturize the air and give you a cool breeze off the water at the same time.

Although it’s not going to be as effective as buying a cool mist humidifier, it’s still a very good option if you do not have a humidifier.

Humidify a room with a bowl of water

When you think about it, water evaporates. And though it may not evaporate at the rate that can give you instant relief, just leaving bowls of water around the house is a humidifier because the water will evaporate and add the moisture to the air.

Leave the water in the bath

One of the easiest ways to have a huge DIY humidifier is to run a bath and leave the water to evaporate instead of draining it out.

Take a shower for humidity

Leaving the doors open when you shower so that the moisture from the shower gets into the rest of the house is also an adequate do-it-yourself humidifier.

Air dry your clothes

I’m old enough to remember when dryers were much less popular and people dried their clothes on clothes lines in the backyard.

They also draw their clothes on clothes lines inside of the house when the weather is not permitting.

It may have taken a lot of door spaces up but nevertheless it increased the humidity inside of the home.

DIY Dryer hose humidifier

Dryers are hooked up to the wall with a hose that expels the heat and humidity outside when it is working.

Unhooking the hose so that the heat and humidity is expelled inside is a do it yourself humidifier that will actually do the job of a warm mist humidifier.

Get some fish

A fish tank is basically the same concept as leaving bowls of water around the house to evaporate.

Your aquarium serves the same purpose and it makes for an excellent hobby.

There are also fish tank/ humidifier combination devices being sold on Amazon. Might be worth checking out.

Flowers in a vase

Another way to keep containers of water around the house is to put flowers out in vases.

Same concept as leaving bowls of water around the house, only with the beautiful addition of flowers to help humidify the home.

House plant sweat

House plants can actually be a good source of indoor humidity because of the little known fact of House plant sweat.

It’s actually called plant transpiration. It’s the process where moisture passes through a plant’s stomata or pores and releases water into the air through their foliage.

This is one of the main reasons for keeping your plants clean. To ensure that their pores are not clogged.

Some plants make better humidifying plants than others though.

Spider Plant humidifier

Spider plants are really easy to grow and they increase the humidity indoors.
They are also on NASA’s big list of air purifying plants which gives them a double bang.

English ivy is another easy plant that has a high humidity increasing rate.

It also is good for reducing the carbon monoxide in the air.

Rubber Plant humidifier

Rubber plants are one of the coolest house plants you can own that also have a high transpiring rate.

They are also on NASA’s list of natural indoor air purifying plants.

Rubber plants also have huge leaves which aids in the humidifying process immensely.

Dwarf Date Palm

Also a cool looking plant to have in the house that is great for increasing the humidity in the home is the dwarf date palm.

Basically a miniature palm tree that can get pretty tall on its own.

Super easy to grow and keep healthy too.

Recap:

Boiling water as a humidifier maybe an old trick but it is one that still works as well as it ever did. It is not only a great way to add moisture to the air, it is also ready to add essential oils to help you breathe better or relax if you want to.

Other DIY tricks people use to increase the humidity in their home is to place bowls of water around the house to evaporate. Good one.

Keep flowers out in vases, same concept, also a good one.

Unhook the dryer hose. You will definitely get some humidity with this trick.

Humidifier plants.

Putting the right plants in your home will not only increase the humidity but will also increase oxygen and decrease indoor air pollution. Win. Win.

Check out the Levoit “everything you could need in a humidifier”  if you want to skip the do-it-yourself route.

Other Resources: Vaporizer or Humidifier

Have You Heard of Putting Hydrogen Peroxide in a Humidifier?

The idea might sound harmless — maybe even comforting. Hydrogen peroxide has been in our medicine cabinets for as long as most of us can remember. I can still picture my mom reaching for the brown bottle anytime I scraped my knee, the fizzing bubbles dancing on the wound like a little science experiment. It felt like part of growing up — as normal as band-aids and hugs.

That’s probably why it caught me off guard when I first heard there was controversy around it. It never occurred to me that something so ordinary, so tied to childhood memories and first-aid kits, could become the center of a heated debate.

And yet here we are. People are talking about putting hydrogen peroxide in humidifiers — not just to clean them, but to purify the air, or even to inhale the mist for health benefits. That’s where things get complicated.

So let’s take a closer look at the controversy. What are the claims, what do the experts say, and what’s the real risk in adding this familiar liquid to your humidifier?

see our complete humidifier guide

Hydrogen Peroxide in Humidifiers: Why It’s So Controversial

Hydrogen peroxide has been a household staple for generations — from treating scrapes to cleaning surfaces. But lately, it’s found its way into a controversial discussion: should it be added to your humidifier?

This debate isn’t just about cleaning. It touches on health, air quality, and even the fine line between science and alternative medicine. Let’s unpack the arguments — and the risks — behind putting hydrogen peroxide in a humidifier.

Why Some People Use Hydrogen Peroxide in a Humidifier

1. Inhaling Hydrogen Peroxide for Respiratory Relief

Some people believe that inhaling the mist from hydrogen peroxide can relieve respiratory symptoms like congestion, cough, or even viral infections. It’s easy to see the appeal: hydrogen peroxide is known for killing germs on surfaces, so why not in the lungs?

The reality: Health professionals strongly caution against inhaling hydrogen peroxide. Even at low concentrations, the mist can irritate or harm sensitive lung tissue. There’s no reliable evidence proving it helps, and the risk of lung damage is real.

2. Disinfecting the Air

Another claim is that hydrogen peroxide mist cleans the air by neutralizing viruses and bacteria. After all, some hospitals use hydrogen peroxide vapor systems to disinfect rooms — so why not replicate that at home?

The problem: Hospital-grade disinfection systems use highly controlled vapor concentrations and specialized equipment — not a home humidifier. Regular humidifiers can’t achieve the proper output, contact time, or safety controls for air disinfection using hydrogen peroxide.

Yes, hydrogen peroxide vapor *can* disinfect surfaces — this study shows it worked against viruses. But that doesn’t mean the same results are possible in your living room with a tabletop humidifier.

3. Keeping the Humidifier Clean

Some people add a splash of hydrogen peroxide to prevent mold or bacterial buildup inside the tank. This might seem like a smart shortcut, but it’s not without consequences.

Hydrogen peroxide can corrode the humidifier’s internal parts over time, especially if it’s a plastic unit. That damage can shorten the device’s lifespan — and potentially release harmful particles into the air.

Can You Use Hydrogen Peroxide to Clean a Humidifier?

You can — but with caution. If you’re disassembling the humidifier and rinsing thoroughly afterward, hydrogen peroxide can help remove microbial buildup. However, white vinegar or diluted bleach are usually safer and more effective choices for cleaning without damage.

The Other Side of the Story: Alternative Health Perspectives

Despite expert warnings, many alternative health advocates believe diluted hydrogen peroxide vapor has healing properties. They say it can clear nasal passages, kill airborne pathogens, and even help reduce viral loads during illness.

Supporters often reference anecdotal success — people who say this is the only thing that helped them recover from illness. There’s also research suggesting low-concentration hydrogen peroxide is safe on mucous membranes, like in this PubMed article used in ENT (ear, nose, and throat) medicine.

Still, this doesn’t mean it’s safe to use in a humidifier. These procedures are usually done under medical supervision and in precise concentrations — not poured into a consumer appliance and inhaled for hours.

What About Gargling with Hydrogen Peroxide?

This is another popular alternative practice. Many use a diluted 1.5% solution to gargle or rinse nasal passages during cold and flu season. And while it’s unrelated to humidifiers, it’s part of the same overall movement toward hydrogen peroxide as a DIY remedy.

Just be aware: Even gargling hydrogen peroxide has risks if not done properly. Don’t exceed recommended concentrations, and always avoid swallowing it.

So… Should You Put Hydrogen Peroxide in Your Humidifier?

Experts say no. Whether your goal is to disinfect air, relieve respiratory symptoms, or clean your humidifier, the risks of using hydrogen peroxide in this way usually outweigh the rewards.

Hydrogen peroxide can damage your lungs when inhaled, corrode your humidifier, and possibly create unexpected chemical reactions when mixed with minerals or additives in tap water.

But not everyone agrees. Proponents of natural and alternative medicine argue that low-dilution use is safe and beneficial. They point to personal stories and niche studies to support their case.

BreatheBetterAir.org is an informational website — we’re not doctors, and we don’t encourage or discourage medical practices. But we do encourage safety first. If you’re considering trying this, talk to a medical professional and make sure you understand all the risks.

Safety Warning

• Never use undiluted hydrogen peroxide in a humidifier.
• 3% hydrogen peroxide should be diluted by at least 50% before use (though it’s still not recommended).
• Food-grade hydrogen peroxide (35%) is highly corrosive and must be diluted 10:1 or more — and handled with gloves and protective clothing.

Bottom line: The controversy exists because there are passionate opinions on both sides. But until more safety data is available, it’s best to approach this method with extreme caution — or skip it altogether.

Final Thoughts: Just Because It Feels Familiar, Doesn’t Mean It’s Safe

It’s easy to trust something we’ve known all our lives. That little brown bottle of hydrogen peroxide feels almost nostalgic — like part of a simpler time when first-aid meant a sting, a hug, and maybe a lollipop. But the comfort of familiarity can be misleading, especially when we start using something in ways it was never really meant for.

Putting hydrogen peroxide in a humidifier may sound like a harmless DIY trick — but it carries real risks. Inhaling it can harm your lungs, it can damage your device, and the supposed benefits often come from anecdotal stories rather than solid science.

That’s not to say the people who swear by it are wrong — but it does mean that if you’re thinking about trying it, you should do your homework, talk to a medical professional, and weigh the risks carefully.

There are safer, proven ways to clean your air, your humidifier, and your lungs. And while hydrogen peroxide still deserves a spot in your medicine cabinet, maybe it’s best to keep it there — and not in your vapor stream.

Sometimes, the old remedies really are the best. Other times, they’re best left in the past.

If you have been doing any type of research on whether or not you can put tap water in a humidifier, you undoubtedly come across a lot of information to scare you.

A lot of sites make it sound like if you put tap water in a humidifier you will have committed the unpardonable sin.

Can You Put Tap Water in a Humidifier?

Using tap water in your humidifier is generally fine, especially if distilled water is not readily available. However, to ensure the longevity of your device and to maintain air quality, it’s important to clean your humidifier regularly and consider using distilled water when possible to minimize potential issues related to mineral buildup and impurities.

What Are The Issues Of Putting Tap Water In A Humidifier?

There are a few considerations to keep in mind to alleviate any concerns and to ensure optimal operation of your device.

1. 1. Water Quality Variations: The quality of tap water can vary depending on your location. In some areas, tap water might contain higher levels of minerals and impurities, which can lead to mineral buildup in your humidifier and potentially disperse these minerals into the air.
   2. Potential for White Dust: Using tap water, especially hard water, in ultrasonic humidifiers can result in a fine, white dust being emitted. This dust is composed of the minerals found in the water. While it’s not harmful to most people, it can be annoying and may settle on furniture and electronics.
   3. Cleaning and Maintenance: To reduce any negative effects of using tap water, regular cleaning and maintenance of your humidifier are crucial. This helps to prevent the buildup of minerals and the growth of mold or bacteria within the device.
   4. Filter Systems: Some humidifiers come equipped with built-in filters designed to reduce mineral deposits. If your humidifier has this feature, using tap water may be less of an issue, though you will need to replace or clean the filters regularly.
   5. Distilled Water as a Better Option: While tap water is generally safe, distilled water is often recommended for use in humidifiers because it lacks the minerals and impurities found in tap water. This can help extend the life of your humidifier, reduce the need for frequent cleaning, and prevent the emission of white dust.

Do these issues constitute some type of crisis that will keep your humidifier from operating? Not really.

And if you look around, you will find some humidifiers like Vicks that tell you to put tap water in your humidifier basin right in the instructions.

And like we pointed out before, if you are keeping up with a regular schedule of cleaning your humidifier with an acidic vinegar, you might not even notice these being issues at all.

And plus there are additives that you can purchase like Aquastick that will cut down the chances of mold becoming a problem with your humidifier for up to 90 days even with tap water.

The primary issue with any type of tap water  that you use in a humidifier is how many minerals and other particles that it contains.

What Water is Best for a Humidifier?

“Distilled water is the best water to run in a humidifier. Distilled water goes through a process that removes 99% of the minerals and sediment that you find in your usual tap water.”

Distilled water simply has less particles that can gum up a humidifier than any other type of water.

So if you want to give your humidifier the best chance for lasting longer, then make distilled water your choice for running inside of your humidifier.

You will find that it cuts down on the amount of humidifier dust that settles around your humidifier.

Does using distilled water in the humidifier mean that you do not have to clean your humidifier?

Not at all. Mold and bacteria will grow in distilled water that has been allowed to sit and become stagnant.

Maybe not as quickly as when you use tap water, but using distilled water in no way prevents the eventual bacteria in water over time.

What About Using Tap Water in A Warm Mist Humidifier?

And if you are using a warm mist vaporizer type humidifier then you already have a built-in mechanism for keeping mold and bacteria from becoming an issue with your humidifier.

These types of humidifiers raise the temperature of the water to a boiling point which will kill any bacteria in the water before it becomes airborne and inhaled by the user.

Humidifiers these days are pretty sophisticated. You can buy humidifiers that operate as both cool mist and warm mist as well as get them built with mold resistant plastic.

Top Fill designs take a huge amount of work out of using a humidifier because they do not require you to take the humidifier apart or turn the basin upside down to fill it with water.

So understandably, once you’ve made that extra investment into a humidifier with all the extra features, then you want to give your humidifier the best chance of lasting longer.

So using distilled water over tap water in your humidifier makes perfect sense at that point.

But the risk of putting tap water in a humidifier really doesn’t amount to a whole lot of excitement. And it’s up to you whether or not you want to deal with a little extra clean up.

Bottled Water in Humidifier?

Should you put a bottle of water in the humidifier if you don’t have any distilled?

Bottled water in a humidifier may be a little better than tap water because it does go through a little stricter of a purification process than tap.

But the minerals are not taken out of bottled water and since it’s the minerals that are the main issue with tap water, you’re only going to get a little bit of improvement using bottled water vs tap water.

How about using boiled water in the humidifier?

Boiling water will kill the bacteria or any type of fungal threat that could be present and water.

But the primary problem with boiling water then putting it into a humidifier is that boiling separates the sediment in the water and getting the water into the humidifier without getting the sediment in the humidifier along with it is going to be a little tough. Not impossible but tough.

Stream water seems like it would be a great solution for a humidifier but it probably has more minerals and sediment in it then tap water. And the likelihood of it already containing bacteria and fungus goes up a thousand percent.

Summary

Should you use tap water in a humidifier?

“You can use tap water in the humidifier as long as you understand that the minerals and other particles in it can eventually reduce the output of the humidifier.”

And tap water generally creates more humidifier dust on and around the humidifier than other types of water.

But if you have a regular cleaning schedule for your humidifier that includes a good acidic vinegar, you may not ever notice that these are issues. source

But humidifiers can be quite expensive if you get the type with all the bells and whistles.

So understandably you want to put the best water possible in the machine to keep it working like new.

Distilled water is the best possible water for a humidifier because it does go through a process of removing the minerals and other particles as well as bacteria.

And it can reduce the amount of humidifier dust you see around your humidifier as well.

Right Out Of The Sink?
You can do it and it’s not the end of the world. But if you want the best water for your humidifier that will increase the chances of it lasting much longer, go with distilled water.