Tap Water vs Filtered Water For Pothos: Does It Actually Matter?

No. Next question.

Fine, a bit more detail. If you can drink your tap water, your Pothos can too.

That’s the rule, it applies everywhere in this article, and you do not need to be buying filtered water, distilled water, or leaving jugs out on the counter overnight to make your tap water safe for your plants.

Your Pothos is not that fussy, and the advice telling you otherwise is not based in any practical reality.

Where This Advice Comes From

The filtered water obsession in houseplant circles comes from the fact that some tropical plants genuinely are sensitive to water quality. Many come from environments where they get vast quantities of clean rainwater, and they’ve adapted accordingly. Their cells are calibrated for soft, mineral-light water and they sulk when they don’t get it.

Pothos are not those plants.

Pothos have what you might generously call a pioneering spirit. They grow in disturbed environments, roadsides, gardens, and forest edges across dozens of countries where they’ve naturalised so successfully they’re classified as invasive. You don’t become an invasive species on multiple continents by being precious about water quality. They are built for resilience, not refinement.

What About Chlorine and Fluoride?

The most common version of this worry is that the chlorine or fluoride added to tap water will damage your Pothos. It won’t, at least not at the concentrations found in drinking water in the UK or most developed countries.

Chlorine at drinking water levels is not toxic to Pothos. Fluoride at drinking water levels is not toxic to Pothos. If your water is safe for you to drink, the concentrations of both are well below anything that would cause a plant problem.

You may have seen advice to leave tap water out overnight to let the chlorine evaporate before using it.

Here’s what’s actually true about that: leaving water out overnight does not meaningfully reduce chlorine levels in the way this advice implies, and it does nothing at all to fluoride, which doesn’t evaporate.

However, room temperature water is nicer for plant roots than cold water straight from the tap, so if you want to leave a watering can out overnight, go for it — just don’t kid yourself that you’re making it chemically safer. You’re just warming it up, which is a fine thing to do.

What About Mineral Buildup?

This is the one area where water quality is worth a passing thought, though it still doesn’t warrant switching to filtered water for most people.

Very hard water — the kind you get in certain parts of the UK, particularly the south east — contains a high concentration of calcium and magnesium. Over time, with repeated watering, minerals can accumulate in the soil and occasionally leave white crusty deposits on the surface. This is cosmetic rather than catastrophic, and you can flush it out periodically by watering very thoroughly and letting the excess drain away, which carries dissolved minerals with it.

Where you might notice an actual cosmetic issue is on Pothos varieties with white or cream variegation — marble queen being the obvious example.

Some plants have a clever mechanism for pushing excess mineral deposits out through the backs of their leaves as a kind of pressure valve. Pothos don’t really do this — they tend to just absorb and accumulate.

In theory this means white-variegated varieties could develop faint brown spotting on pale leaf sections in very hard water areas over time. In practice, this tends to be minimal.

A marble queen grown in hard tap water is not going to look dramatically worse than one grown in filtered water. If you notice brown marks on pale leaf sections and your water is extremely hard, it’s worth considering — but it’s the last thing to worry about, not the first.

For standard green Pothos — golden, neon, jade — mineral sensitivity is essentially a non-issue.

When Might Water Quality Actually Matter?

Almost never, but here are the edge cases worth knowing:

Extremely hard water areas with sensitive variegated varieties. As above. Not a crisis, just something to keep in mind if you’re growing a lot of white variegates and your kettle furs up very quickly.

Water that isn’t safe to drink. The rule is: if you can drink it, your Pothos can too. The flip side of that rule is that if your tap water isn’t safe to drink — if you’re in an area with contamination issues or you’re using water from a source you wouldn’t put in your own glass — don’t use it on your plants either. This is rarely relevant in the UK but worth stating.

Very cold water straight from the tap in winter. Not a water quality issue, but cold water can mildly shock roots, especially in winter when the soil is already cool. Letting water come to room temperature first is a perfectly good habit. It just has nothing to do with chlorine.

What You Actually Should Worry About Instead

The amount of collective anxiety in plant communities about water type is genuinely disproportionate to its actual impact on plant health. While people are sourcing distilled water for their Pothos, their Pothos is probably drooping because they watered it three days after the soil dried out, or it’s sitting in a dim corner wondering what it did wrong.

The things that actually affect your Pothos are: how often you water it, whether you’re over or underwatering, and how much light it’s getting. Water type sits a long way down the list.

Tap water is fine. Use it with confidence.

Tap Water For Pothos FAQs

New to Pothos? Water type is the last thing to worry about when you’re just starting out. The free guide — Everything You Need To Do When You Bring Your First Pothos Home — covers what actually matters in the first few weeks. [Get the free guide →]