Watering Plants with Dehumidifier Water: A Complete Guide

Purity and Composition of Dehumidifier Water

Dehumidifier water is sometimes compared to distilled water due to its low mineral content. However, water from the dehumidifier can be more contaminated with substances that float around and materials inside the dehumidifier. Understanding these potential contaminants is crucial for making informed decisions about this water safely and effectively. These contaminants include:

Bacteria, mold, and microorganisms from the air.

During the dehumidifier operation, particles such as bacteria, mold spores, or other microorganisms present in the air can become trapped in the water. Since the water in a dehumidifiers reservoir is not subject to the same stringent filtration or sterilization processes as drinking water, these microorganisms can accumulate over time.

This leads to increased contamination levels, mold growth within the dehumidifier, and more microorganisms like fungi and protozoa.

The possible presence of heavy metals from cooling coils. (copper, zinc, aluminum)

Another concern with dehumidifier water is the potential presence of heavy metals, which can leach into the water from the components of the dehumidifier itself, particularly the cooling coils. These coils are often made from metals such as copper, zinc, and aluminum, which corrode over time.

While some of these metals may be considered essential nutrients, it’s important to note that excessive exposure can harm both humans and plants.

Therefore, the purity level of dehumidifier water is questionable for direct consumption or plant use.

Is Dehumidifier Water Safe for Plants?

When it comes to using dehumidifier water for plants, it’s essential to distinguish between different types of plants and their specific needs. While dehumidifier water may not be suitable for all plants, it is for some other types.

Dehumidifier water is generally safe and can offer several benefits for non-edible indoor plants. These plants, which include common houseplants like ferns, spider plants, and philodendrons, can thrive with this recycled water.

One of the reasons it’s safe is due to the water’s similarity to rainwater. If the air in your home is clean (a bit like rainwater) then you can use the water on your indoor plants. The reason is that both waters are considered “soft” water, meaning they contain low levels of dissolved minerals such as calcium and magnesium.

This softness of water is beneficial to plants, as hard, mineral-rich water leads to salt buildup in the soil, which can damage plant roots over time. You can prevent this issue and promote healthier soil conditions for your indoor plants with dehumidifier water.

Note: Don’t use dehumidifier water if your indoor plants suffer from a fungal disease. The spores might have gotten trapped in the dehumidifier so it’s not a good idea to reuse it for your plants.

Here are a few considerations to keep in mind:

Cleanliness of the Dehumidifier – The safety of dehumidifier water largely depends on the cleanliness of the dehumidifier unit itself. Regular maintenance and cleaning prevent the buildup of bacteria, mold, and other contaminants in the water reservoir. You can minimize the risk of transferring harmful microorganisms to your plants by keeping your dehumidifier in good condition.

Watering Frequency and Volume – Monitor the watering needs of your indoor plants carefully. Overwatering can lead to root rot and other issues, regardless of the water source. Ensure that your plants have proper drainage and that you’re not overusing the dehumidifier water. A balanced approach to watering will keep your plants healthy and thriving.

Observation of Plant Health – Observe your plants for signs of distress or unusual growth patterns after switching to dehumidifier water. While dehumidifier water is similar to rainwater, every plant species has unique requirements and tolerances. If you notice any negative effects, consider adjusting your watering routine or alternating with tap water occasionally.

Using dehumidifier water for outdoor plants is an effective way to conserve drinking water and ensure that your garden flourishes, even during periods of drought. However, there are important factors to note to ensure the health and safety of your plants.

Types of Plants – Not all plants are equally tolerant of gray water. While ornamental plants, shrubs, and trees generally fare well with gray water, edible plants need caution.

Water Quality and Contaminants – The quality of dehumidifier water can vary based on the cleanliness of the dehumidifier unit and the environment in which it operates. You reduce the risk of transferring harmful substances to your outdoor plants by ensuring your dehumidifier is clean. This is also applicable to indoor plants.

Soil Health – Gray water, including dehumidifier water, can affect soil health. The repeated use of gray water can lead to the accumulation of salts and other minerals in the soil, which may harm plant roots and reduce soil fertility. To mitigate this risk, monitor soil health regularly and consider soil amendments or occasional flushing with potable water to prevent salt buildup.

Watering Techniques – When using dehumidifier water for outdoor irrigation, it is important to employ appropriate watering techniques. Drip irrigation or direct soil application methods can help minimize the contact between gray water and plant leaves, reducing the risk of foliar diseases. Avoid overhead watering, as this can increase the likelihood of spreading contaminants to the entire plant.

While non-edible indoor and outdoor plants can generally benefit from this recycled water, the same cannot be said for plants intended for consumption.

The composition of the dehumidifier water reveals potential contamination of bacteria, mold, and microorganisms. Using this contaminated water on edible plants can transfer harmful bacteria to the plants, posing a risk of foodborne illnesses when the produce is consumed.

Mold on edible plants is potentially dangerous to the produce and triggers allergic reactions and other health issues in sensitive individuals.

Also, long-term exposure to heavy metals through contaminated water can accumulate in the soil and be absorbed by plants, posing health risks when the plants are consumed.

So it’s best to avoid any gray water usage for edible foods, especially for plants that are eaten raw (e.g., Herbs, Salad Greens). Extra caution must be placed on plants eaten raw because there’s no benefit of cooking to remove pathogens. Direct consumption even with washing can pose severe health risks.

Is Dehumidifier Water Safe for Plants?

FAQ

Is it okay to use dehumidifier water to water plants?

Dehumidifiers are not made from food grade materials and the water that drips from them can and does contain heavy metals and industrial pollutants. Don’t use that water on plants you intend to consume.

Can I use the water from my dehumidifier?

• Cleaning:

  You can use dehumidifier water for mopping floors, washing windows, cleaning surfaces, or washing cars. 

• Laundry:

  For top-loading washing machines, you can use dehumidifier water as the initial fill water for the wash cycle. 

• Plants:

  You can use it to water houseplants, but avoid using it for edible plants, as it may contain contaminants. 

• Steam Iron:

  Dehumidifier water is excellent for steam irons, as it’s essentially distilled and won’t cause limescale buildup. 

• Toilet Flushing:

  You can pour dehumidifier water into the toilet bowl before flushing, saving fresh tap water. 

• Car Radiator:

  Some people use dehumidifier water in their car radiator, as it is free of minerals that can cause buildup. 

• Battery Use:

  Dehumidifier water can be used to top off batteries. 

Is dehumidifier water the same as distilled water?

• Dehumidifier Water:

  Dehumidifiers condense water vapor from the air, but this process doesn’t include boiling or any other purification methods to remove impurities. Therefore, the water collected may contain airborne contaminants like dust, mold spores, and bacteria, as well as some minerals. 

• Distilled Water:

  Distilled water is produced by boiling water, then condensing the steam, which leaves behind impurities and minerals. This process results in a very pure form of water, free from most dissolved substances. 

• Key Differences: 

  • Purification Method: Dehumidifier water is collected through condensation, while distilled water is purified through distillation (boiling and condensation). 

  • Purity: Distilled water is generally considered more pure than dehumidifier water, as it undergoes a purification process to remove impurities. 

  • Contaminants: Dehumidifier water may contain airborne contaminants like dust, mold spores, and bacteria, while distilled water is free from most dissolved substances. 

Where to dump dehumidifier water?

Many dehumidifiers provide a threaded spigot to connect a water hose for drainage. If you have a floor drain or basement sink, you can port the water to the drain by using gravity. Water is continuously being removed from the air, then into the unit, and then down into the drain.

Can a dehumidifier irrigate indoor plants?

According to Water Management Specialist Janet Manning, dehumidifier water – which is a form of gray water (used water in your house that normally goes down the drain) – can be good for indoor and outdoor plants if the air inside your home is clean, as it’s a bit like using rainwater.

Is dehumidifier water good for plants?

According to Water Management Specialist Janet Manning, dehumidifier water – which is a form of gray water (used water in your house that normally goes down the drain) – can be good for indoor and outdoor plants if the air inside your home is clean, as it’s a bit like using rainwater.

Can you use a dehumidifier in a drought?

Water from a dehumidifier is good for watering plants outside your home during a drought. And since about 30% of drinkable water in the U.S. is used to irrigate outdoor plants, during a drought it’s a good idea to use any gray water you can for watering your yard.

Does dehumidifier water go down the drain?

The water from the dehumidifier might not go down the drain after all. Instead, you could use it to water plants on your windowsill, deck, or patio without having to use the garden hose or watering can. However, should you really use dehumidifier water for plants?. We spoke to experts to get the scoop on using dehumidifier water for plants at home.

Can you use dehumidifier water outside?

The exception would be plants you plan to eat – like herbs, lettuce, or tomatoes. For edibles, it’s better to use filtered or distilled water to limit any bacteria or mold exposure. Dehumidifier water can also be used to water outdoor plants, gardens, trees, and lawns. The dilution from outdoor watering minimizes any potential risks.

What can you use a dehumidifier for?

You can use the condensate to water-thirsty inedible plants that won’t end up on your plate. These include plants such as garden flowers, shrubs, trees, lawns, and more. Additionally, the demineralized nature of the dehumidifier water makes it ideal for carnivorous plants, which love this type of water.