Can I reuse water from a dehumidifier?

So you're running that dehumidifier non-stop and watching gallons pile up—wondering if you can actually do something with it besides dumping it down the drain. Honestly, I get it. During muggy months, my unit pulls out like 5 gallons a day. Feels almost criminal to waste. But here's the thing: this water isn't drinkable. Not even close. Still, with some common sense, you can repurpose it for plenty of household stuff. It's all about knowing what's floating around in there and matching it to the right job.

What contaminants are in dehumidifier water?

Dehumidifier water comes from moisture in the air, sure, but it picks up all sorts of junk along the way. We're talking airborne dust, pollen, mold spores, bacteria—even heavy metals from the coil or that plastic tank. The water's actually pretty mineral-poor, almost like distilled water. But here's the gross part: let it sit in a warm tank for 48 hours and bacterial counts can skyrocket past 100 CFU/mL. That's a hard no for drinking or watering anything you plan to eat. Trust me, you don't want that in your system.

Can I use dehumidifier water for plants?

Yeah, but only for your non-edible ornamental plants. The lack of minerals means it's missing nutrients tap water would give, but most houseplants don't seem to mind. I've used it on my pothos and ferns for years—they're fine. Just don't try it on seedlings, succulents, or anything that's picky about minerals. And for the love of god, don't use it on your vegetable garden or herb pots. Bacterial risk is real. One more thing: let it warm up to room temperature first, otherwise you'll shock the roots.

Plant Type	Suitable for Dehumidifier Water?	Precautions
Ornamental houseplants (pothos, ferns, snake plants)	Yes	Let water sit 24 hours to dissipate any chlorine
Edible plants (tomatoes, lettuce, herbs)	No	Risk of bacterial contamination
Succulents and cacti	Occasionally	Mix 50/50 with tap water for minerals
Seedlings	No	Too mineral-poor for young growth

Is dehumidifier water safe for cleaning?

For cleaning, yeah, it's pretty solid. I use it for mopping floors, washing windows, scrubbing outdoor furniture, and rinsing garden tools. The low mineral content actually helps—no hard water spots on glass or mirrors, which is a nice bonus. But here's the line: don't use it on food prep surfaces, dishes, or anything that touches food. For laundry, it's okay for pre-washing dirty stuff, but skip it for the final rinse on clothes you wear against your skin. Just not worth the risk, you know?

Cleaning checklist for dehumidifier water

• Mopping tile, vinyl, or hardwood floors
• Washing windows and mirrors (no streaking)
• Cleaning outdoor tools and garden equipment
• Flushing toilets (pour directly into bowl)
• Filling steam irons (prevents mineral buildup)
• Washing cars or outdoor furniture

Can I reuse dehumidifier water for appliances?

This is where dehumidifier water really shines—appliances that hate minerals. Steam irons, humidifiers, car batteries—all benefit from this stuff. For steam irons, it extends the life and stops clogging. In humidifiers, it cuts down on that annoying white dust from mineral deposits. But here's a tip I learned the hard way: always filter it through a coffee filter or cheesecloth first. You'd be surprised what floats around in there. And never, ever use it in CPAP machines, neti pots, or any medical devices. Infection risk is no joke.

How should I store dehumidifier water?

Storage is key—bacteria grow fast. I transfer it to a clean, sealed container right after collecting. Glass or food-grade plastic works best. Keep it in a cool, dark spot and use it within 3-5 days. Label it clearly as "non-potable water" so nobody accidentally drinks it. If you see any slimy film, smell something off, or notice discoloration, just dump it. And clean the dehumidifier tank with a vinegar solution right away. Better safe than sorry.

"Dehumidifier water is a free resource for non-potable uses, but never compromise on safety. When in doubt, use tap water instead." — EPA Water Conservation Guidelines

Frequently Asked Questions

Can I drink dehumidifier water if I boil it?

No way. Boiling kills bacteria, sure, but it doesn't touch heavy metals, chemical residues, or airborne pollutants. You could still have lead, copper, or VOCs in there. Just don't drink it, period. Not worth it.

Does dehumidifier water have minerals?

Nope. It's basically distilled water—very low mineral content. No calcium, no magnesium, nothing like tap water. Great for appliances, but not great for plants that need those trace minerals.

Can I use dehumidifier water for my fish tank?

I wouldn't. The water might have copper from the dehumidifier coils, and that's toxic to fish. Even tiny amounts can harm them. Stick with treated tap water and a dechlorinator.

How often should I clean my dehumidifier tank?

Every 2-3 weeks, mix 1 part white vinegar with 3 parts water and give it a good scrub. This keeps mold and bacteria in check. Rinse thoroughly. If you catch a musty smell, clean it immediately—don't wait.