No, you should not drink water from a dehumidifier
The water a dehumidifier collects is not safe to drink. It may look clear, but it contains bacteria, mold spores, and mineral deposits that accumulated inside the machine. Even if the water appears clean, it can carry pathogens that cause illness. Boiling or filtering it at home does not reliably remove all contaminants.
The water also picks up whatever is already in your indoor air—dust, pet dander, cooking fumes, and particles from cleaning products. Once inside the dehumidifier, the collection tank becomes a warm, moist environment where bacteria and mold grow quickly, especially if you do not empty it daily.
Key Takeaways
- Dehumidifier water contains bacteria, mold, and minerals that make it unsafe to drink even after boiling or home filtering.
- The collection tank is a breeding ground for pathogens because it stays warm and wet between emptying cycles.
- Safe uses for dehumidifier water include watering outdoor plants, cleaning floors, or filling a toilet tank—never for drinking or cooking.
- If you need drinking water from humidity, a whole-home water system or bottled water is the only safe option.
Why dehumidifier water is contaminated
A dehumidifier pulls moisture from the air by running it over cold coils. The water that condenses is pure H₂O at that moment, but it when ready comes into contact with the inside surfaces of the machine. Those surfaces are rarely sterile. Dust, mold spores, and bacteria live on the coils and in the tank before the water even arrives.
The collection tank itself is the biggest problem. It sits at room temperature or warmer, stays damp between emptying cycles, and is rarely cleaned thoroughly. Bacteria and mold colonies establish themselves within days. If you leave the tank full for more than a day or two, the water becomes visibly cloudy or develops an odor—a sign that microbial growth is well underway.
Even if you empty the tank daily and rinse it, you cannot sterilize it without specialized equipment. Wiping it with a cloth or running water through it removes some debris but not the microscopic organisms already colonized on the plastic surfaces.
What contaminants are actually in the water
The main hazards are bacteria (including species that cause gastrointestinal illness), mold spores, and mineral deposits from tap water that evaporated into your air. If you have hard water in your home, minerals like calcium and magnesium concentrate in dehumidifier tanks over time.
You may also find legionella bacteria in dehumidifier water, especially if the machine sits unused for weeks. Legionella grows in warm water systems and can cause a serious respiratory infection called Legionnaires' disease. The risk is low from touching or splashing the water, but drinking it or inhaling mist from it poses a real danger.
Boiling the water kills most bacteria and viruses, but it does not remove minerals, mold toxins, or spores themselves. Home filters (pitcher filters, faucet filters) are not designed for this type of contamination and will not make the water safe.
Safe ways to use dehumidifier water
Dehumidifier water is perfectly fine for non-drinking purposes. You can use it to water outdoor plants, wash floors, fill a toilet tank, or rinse outdoor equipment. Plants actually benefit from the minerals in the water. For outdoor use, the bacteria and mold present no risk because they are diluted and exposed to sunlight and soil microbes.
Some people collect dehumidifier water in a large bucket or barrel for gardening during dry months. This is an economical way to reuse the water. Just keep the collection tank clean and empty it at least every two days to prevent odor and excessive bacterial growth.
Do not use dehumidifier water for cooking, making ice, filling a humidifier, or washing dishes. Any use where the water might be ingested or inhaled carries risk.
How to store dehumidifier water safely
If you plan to use the water for plants or cleaning, store it in a covered container away from direct sunlight. Sunlight and warmth speed up bacterial growth. A sealed bucket or barrel in a garage or basement works well. Label the container clearly so no one mistakes it for drinking water.
Empty the dehumidifier's collection tank at least once every two days, more often in humid weather. If the tank has a drain hose, you can run it directly into a bucket or floor drain, which is more convenient than carrying a full tank. Some dehumidifiers have a continuous drain option that lets water flow directly outside or into a sump pump.
If you notice an odor coming from the tank or the water looks cloudy, empty it when ready and rinse the tank with clean water. Do not use that batch of water, even for plants, if it smells strongly of mold or decay.
When to call a professional about water quality
If you are concerned about the overall quality of your home's water—whether for drinking or other uses—a water test from a certified lab can tell you what is actually in your tap water. Your local health department or a water treatment company can arrange this. The test costs between $100 and $300 and takes a week or two for results.
If you want to collect and use humidity as a water source for drinking, you need a whole-home water system with proper filtration and UV treatment, not a dehumidifier. These systems are expensive (several thousand dollars installed) and require professional installation and maintenance. For most households, bottled water or a point-of-use filter on your kitchen tap is a simpler and safer choice.
Frequently Asked Questions
What if I boil dehumidifier water—is it safe then?
Boiling kills bacteria and viruses but does not remove mold spores, minerals, or mold toxins already in the water. It is not a reliable way to make dehumidifier water safe to drink. If you need drinking water, use tap water with a certified filter or bottled water instead.
Can I use dehumidifier water in my humidifier?
No. Using dehumidifier water in a humidifier spreads bacteria and mold spores into the air you breathe. Always use distilled water or tap water in a humidifier. Dehumidifier water is only safe for outdoor plants and cleaning.
Is dehumidifier water the same as distilled water?
No. Distilled water is boiled and condensed in a controlled, sterile environment. Dehumidifier water condenses in a machine that is not sterile and sits in a tank where bacteria and mold grow. They are not equivalent.
What if the dehumidifier is brand new—is the water safe then?
Even a brand-new dehumidifier produces water that is not safe to drink. The coils and tank are not sterile, and contamination begins when ready. After the first use, the water is definitely unsafe. Stick to outdoor and cleaning uses only.
Can I filter dehumidifier water with a Brita or similar pitcher?
Standard pitcher filters are designed for chlorine and taste, not for bacteria, mold, or legionella. They will not make dehumidifier water safe to drink. Do not rely on them for this purpose.