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You fill up the watering can from the kitchen tap.
Then, just as you’re about to water your plants, you remember something you saw online.
Tap water is killing your houseplants.
Apparently you should be collecting rainwater, buying distilled water, filtering everything or leaving a watering can sitting around for 24 hours before you’re allowed anywhere near a Calathea.
So, can you water houseplants with tap water?
For most houseplants, yes.
Ordinary tap water is perfectly adequate for many indoor plants.
However, tap water varies enormously depending on where you live, and some plants are more sensitive to minerals and chemicals in water than others.
So before you start importing artisanal mountain water for your Pothos, let’s look at when tap water is absolutely fine — and when switching water might genuinely help.
Is Tap Water Safe for Houseplants?
Usually, yes.
Millions of houseplants are watered successfully with ordinary tap water every day.
If your plants are:
- Growing normally
- Producing healthy leaves
- Not developing unexplained brown tips
- Not accumulating lots of mineral deposits
there’s generally no reason to suddenly change what you’re doing.
The important thing to remember is that tap water isn’t identical everywhere.
Depending on your water supply, it can contain different concentrations of minerals and treatment chemicals.
That means someone else’s dramatic experience with tap water doesn’t necessarily tell you anything about yours.
What’s Actually in Tap Water?
Tap water isn’t simply pure H₂O.
Depending on your local supply, it may contain things including:
- Calcium
- Magnesium
- Chlorine
- Chloramine
- Fluoride
- Dissolved salts and minerals
Many of these are present at levels that cause no significant problems for ordinary houseplants.
Problems are more likely when you have particularly hard or mineral-rich water, or you’re growing plants that are unusually sensitive.
Is Chlorine in Tap Water Bad for Houseplants?
This is probably one of the biggest worries people have about using tap water.
Water suppliers may use chlorine to disinfect drinking water.
At the concentrations normally present in drinking water, chlorine isn’t automatically going to kill your houseplants.
For most common houseplants, it isn’t something I’d panic about.
If you’re successfully growing plants with your tap water already, you certainly don’t need to overhaul your entire watering routine because someone on Instagram said the word chlorine ominously.
Should You Leave Tap Water Out Overnight Before Watering Plants?
This is one of the most repeated pieces of houseplant advice:
Fill your watering can and leave it overnight so the chlorine evaporates.
There’s a little truth buried in here.
Free chlorine can dissipate from water when it’s left exposed to air.
However, there’s a catch.
Some water supplies use chloramine rather than, or alongside, free chlorine.
Chloramine is much more stable and isn’t simply going to disappear because you left your watering can beside the sink overnight.
So leaving water standing isn’t a universal magic trick that transforms tap water into perfect plant water.
If you’ve always done it and it works for you, carry on.
But for most ordinary houseplants, you don’t need to start keeping twenty-four-hour-old water around the house.
Is Hard Water Bad for Houseplants?
This one is more interesting.
Hard water contains relatively high levels of dissolved minerals, particularly calcium and magnesium.
You may already know you have hard water because you see:
- Limescale around taps
- White marks on shower screens
- Scale inside the kettle
Some houseplants cope perfectly well with hard tap water.
Others can be more sensitive.
Over time, minerals can also accumulate in the potting mix, particularly if water regularly evaporates from the soil rather than excess water flushing through the container.
Why Is There White Stuff on My Houseplant Soil?
If you notice a pale or crusty deposit on the soil surface or around the rim of a plant pot, it may be a build-up of mineral salts.
These can come from:
- Hard water
- Fertiliser
- A combination of both
It doesn’t automatically mean the plant is dying.
But substantial accumulation can eventually affect the growing conditions around the roots.
Occasionally watering thoroughly enough that excess water drains from the pot can help flush accumulated salts.
Just make sure the pot can drain properly afterwards.
If you’re having the opposite problem and water simply races through without wetting the root ball, read Why Does Water Run Straight Through My Houseplant Soil?
Why Do My Houseplants Have Brown Leaf Tips?
Water quality is one possible cause.
It is absolutely not the only one.
Brown tips can also result from:
- Underwatering
- Inconsistent watering
- Low humidity
- Overfertilising
- Root problems
- Environmental stress
- Natural leaf ageing
Some sensitive plants can develop brown tips or edges when repeatedly exposed to certain minerals or salts in water.
But don’t diagnose every crispy leaf as a tap-water emergency.
Look at the whole plant and its growing conditions.
Which Houseplants Are More Sensitive to Tap Water?
Some plants have a reputation for being less tolerant of mineral-heavy or chemically treated water.
These can include:
Calatheas and other prayer plants
The classic.
If you’ve ever owned a Calathea, you’ll know it doesn’t necessarily need a reason to develop a brown edge.
But water quality can contribute.
Dracaena
Dracaenas can be sensitive to fluoride and mineral accumulation, which may contribute to brown leaf tips.
Spider Plants
Spider Plants can also develop brown tips, with water quality among several possible causes.
If yours is otherwise thriving, don’t assume you need to panic about every brown millimetre.
You can also read How to Propagate a Spider Plant if yours has started producing babies.
Some orchids
Water quality can be more important for certain orchids, particularly where mineral salts build up around sensitive roots.
Check out the Orchid Care Guides for more specific advice.
Is Filtered Water Better for Houseplants?
Sometimes.
It depends both on what is in your tap water and what your filter actually removes.
Different filters remove different substances.
A standard household filter may reduce some minerals or chemicals but won’t necessarily remove everything you’re concerned about.
So don’t assume that “filtered” automatically means “pure.”
For most robust houseplants, filtered water is probably unnecessary.
But if you have particularly problematic tap water or sensitive plants repeatedly showing symptoms, experimenting with filtered water can be reasonable.
👉 Shop water filter jugs
Is Distilled Water Good for Houseplants?
Distilled water contains very few dissolved minerals.
That can make it useful for particularly sensitive plants where tap-water mineral accumulation is causing problems.
But there’s absolutely no need to buy distilled water for every Pothos, Snake Plant and ZZ Plant in your house.
That would get expensive and annoying remarkably quickly.
If your plants are happy with tap water, leave them alone.
Is Rainwater Better for Houseplants?
Rainwater can be an excellent option for many plants.
It naturally contains far fewer of the dissolved minerals associated with hard tap water.
If you have a convenient and safe way of collecting rainwater, many houseplants will happily accept it.
But there are practical considerations.
Collected rainwater can become contaminated by:
- Dirty roofs
- Gutters
- Animal waste
- Debris
- Poorly maintained storage containers
And if you live somewhere that gets approximately three raindrops a year, building your entire houseplant-care strategy around rainwater is perhaps optimistic.
Tap water is considerably easier to obtain.
Can You Use Boiled Water for Houseplants?
You can use water that has been boiled and completely cooled, but boiling isn’t a simple solution to every tap-water issue.
Boiling may affect some aspects of water chemistry, but it doesn’t magically remove every dissolved substance.
And obviously:
do not pour hot kettle water onto your Monstera.
I can’t believe I need to write that sentence.
But the internet exists.
Can You Use Bottled Water for Houseplants?
You can, but it’s usually unnecessary.
Bottled waters also contain varying levels of dissolved minerals, so “bottled” doesn’t automatically mean better for plants.
It’s also considerably more expensive and wasteful than turning on the tap.
I’d only consider buying specialist water if I had a particularly sensitive plant and a genuine reason to believe my tap water was causing problems.
Tap Water vs Filtered Water vs Rainwater
| Water | Suitable for houseplants? | Best use |
|---|---|---|
| Tap water | Usually | Most ordinary houseplants |
| Filtered water | Yes | Sensitive plants/problematic tap water |
| Distilled water | Yes | Particularly sensitive plants |
| Rainwater | Usually | Excellent general option when safely collected |
| Bottled water | Usually | Rarely necessary |
| Boiled and cooled water | Possible | Usually unnecessary |
For most people, I’d start with tap water.
Only complicate things if the plants give you a reason to.
Should You Use Room-Temperature Water?
You don’t need to take your plant’s water temperature with a thermometer.
But I’d avoid extremes.
Very hot water can damage plant tissue.
Extremely cold water may stress sensitive plants.
Ordinary cool or room-temperature tap water is generally fine.
Again, houseplant care doesn’t need to become a laboratory experiment.
Does Tap Water Cause Brown Tips on Spider Plants?
It can contribute, particularly where water contains substances the plant is sensitive to.
But brown tips on Spider Plants can have several causes.
Before changing water, consider:
- Is the plant drying out too much?
- Are you fertilising heavily?
- Is the air extremely dry?
- Is there visible salt build-up?
- Is only a tiny part of an otherwise healthy leaf brown?
If the plant is otherwise flourishing, a few imperfect leaf tips aren’t necessarily a crisis.
Should You Flush Houseplant Soil?
Occasionally allowing plenty of water to pass through the growing medium can help wash accumulated soluble salts from the pot.
If you’re going to do this, the container needs proper drainage.
Let the excess water escape completely rather than allowing the pot to sit in it afterwards.
This is also one reason I don’t exclusively bottom water every plant forever.
Bottom watering can be extremely useful — especially for hydrophobic soil — but occasional top watering can help flush the growing medium.
Read Should You Bottom Water Houseplants? Pros, Cons & When to Do It for more on when each method makes sense.
Is Tap Water Causing My Houseplant Problems?
Before blaming the tap, check the more common problems first.
Ask:
Are you watering too frequently?
Constantly wet soil can cause far bigger problems than ordinary tap water.
Read Why Does My Houseplant Soil Stay Wet for So Long?
Are you watering enough?
A plant repeatedly allowed to become severely dehydrated can develop brown, crispy foliage.
Read How Often Should You Water Houseplants?
Is the soil actually absorbing the water?
If it has become hydrophobic, water may be bypassing the roots entirely.
Read Why Does Water Run Straight Through My Houseplant Soil?
Is the plant getting enough light?
Poor light affects how quickly a plant uses water and can contribute to overwatering problems.
The Complete Beginner’s Guide to Grow Lights for Houseplants explains what to do if natural light isn’t enough.
Is it rootbound?
If roots have taken over most of the pot, watering can become increasingly difficult.
If so, see What Do You Need to Repot a Houseplant? The Complete Beginner’s Kit.
When Should You Stop Using Tap Water for a Houseplant?
I’d consider experimenting with a different water source if:
- You know your water is particularly mineral-heavy
- A sensitive plant repeatedly develops brown tips
- You have substantial mineral deposits on soil and pots
- Problems persist despite otherwise appropriate care
- The particular plant is known to be sensitive to substances in your local water
Try filtered, rainwater or distilled water for a period and watch the new growth.
That’s important.
Damaged leaf tips aren’t going to turn green again just because you’ve changed water.
Judge whether the new leaves improve.
Do You Need a Moisture Meter?
Not for water quality.
But if the bigger problem is that you’re struggling to tell when your plants need watering, a moisture meter can be a useful extra tool.
👉 Shop houseplant moisture meters
Don’t let it completely replace checking the soil, pot weight and plant itself.
I’ve yet to encounter a £10 moisture meter that deserves to become Supreme Commander of the Houseplants.
Frequently Asked Questions
Can I water my houseplants straight from the tap?
Yes. Most common houseplants can be watered with ordinary tap water. Some sensitive plants may benefit from filtered, distilled or rainwater if local tap water causes problems.
Should tap water sit for 24 hours before watering plants?
Usually, it isn’t necessary. Leaving water exposed may allow some free chlorine to dissipate, but it won’t reliably remove chloramine or dissolved minerals.
Is hard tap water bad for indoor plants?
Not necessarily. Many houseplants tolerate hard water, although minerals can accumulate in the potting mix over time and some plants are more sensitive.
What plants don’t like tap water?
Calatheas and other prayer plants, some Dracaenas, Spider Plants and certain orchids can be more sensitive to particular minerals or substances in tap water.
Is filtered water better than tap water for plants?
It can be for sensitive plants, depending on your tap water and what the particular filter removes. For most common houseplants, it isn’t essential.
Is rainwater good for houseplants?
Yes. Rainwater can be excellent for houseplants when it has been collected and stored safely.
Is distilled water good for houseplants?
Yes, particularly for plants sensitive to mineral-heavy water. However, it’s unnecessary for most ordinary houseplants.
Can tap water cause crispy leaves?
Water quality can contribute to brown or crispy leaf tips in sensitive plants, but underwatering, humidity, fertiliser, root problems and other environmental factors can cause similar symptoms.
Final Thoughts
So, can you water houseplants with tap water?
Yes.
For the majority of ordinary houseplants, I’d start there.
If they’re growing happily, don’t invent a problem because someone online told you your tap water is poisonous to plants.
If you have a particularly sensitive plant, very hard water or persistent brown tips and mineral deposits, then experimenting with filtered, distilled or rainwater may be worthwhile.
But look at the whole plant before blaming the water supply.
The difference between a thriving plant and a miserable one is far more likely to involve the basics — light, watering frequency, drainage, roots and suitable growing medium — than whether you remembered to leave Tuesday’s watering can sitting on the counter overnight.
Continue Reading
- How Often Should You Water Houseplants?
- Should You Bottom Water Houseplants? Pros, Cons & When to Do It
- Why Does Water Run Straight Through My Houseplant Soil?
- Why Does My Houseplant Soil Stay Wet for So Long?
- What Do You Need to Repot a Houseplant? The Complete Beginner’s Kit
- The Complete Beginner’s Guide to Grow Lights for Houseplants
- How to Propagate a Spider Plant
- Orchid Care Guides