Is Distilled Water Safe To Drink?

The short answer, and then the useful one

Yes. Distilled water is safe to drink, it will not harm you, and the alarming claims circulating about it leaching minerals out of your body are not supported by the regulators who actually look at this.

The useful question is a different one, and it is the reason this page is not three sentences long: almost nobody asking it needs a distiller. They need either reassurance about a bottle they already bought, or they need low-mineral water for a specific device, or they want cleaner drinking water and have landed on the wrong technology. Those three need different answers.

What the regulators actually say about low-mineral water

Here is where the genuine nuance sits, and it is worth getting right rather than picking whichever side suits the conclusion.

Total dissolved solids — the bulk measure of minerals in water — has no health-based limit anywhere, in either direction. Health Canada is explicit that it is not possible to derive a meaningful health-based value for TDS because it is a mixture of many different salts, and sets only an aesthetic objective of 500 mg/L or less, aimed at taste and scaling complaints. WHO has likewise never proposed a health-based guideline value for TDS.

And yet the same Health Canada document does not dismiss the mineral concern. It states that regular drinking of distilled or demineralized water over weeks or months can lead to deficiencies in calcium, magnesium or sodium, listing possible effects including extreme fatigue, muscle cramps and cardiovascular disorders.

Both of those are from the same official source and they are not contradictory. The honest reading is: there is no safe-minimum mineral level in water, drinking distilled water is not dangerous, and a national health agency nonetheless advises against making demineralized water your sole source for months on end. Context matters a great deal — a normal diet supplies far more calcium and magnesium than water does, so the risk is concentrated in people with marginal intake to begin with.

Which is why this page's position is not "distilled water is bad". It is that distillation is a poor choice of technology for everyday drinking water, for reasons that have little to do with minerals.

Distilled, reverse osmosis and filtered are three different things

People use these words interchangeably and they describe genuinely different mechanisms with different failure modes.

The volatile-organics row is the one that surprises people and it is the honest weakness of distillation. Compounds that boil at or below water's boiling point travel with the steam and condense alongside it, which is why a carbon stage is part of the process on any serious distiller rather than an upsell.

The certification row is the practical one. CDC's own list of home-treatment standards names Standard 62 (distillation) alongside 42, 53 and 58 — so the standard exists. It is simply that very few consumer distillers are listed under it, while reverse osmosis systems are listed under 58 in quantity. If you want to verify performance rather than trust physics, that difference decides it.

What reverse osmosis actually gets you, in numbers

The case for reverse osmosis over a distiller for drinking water is not hand-waving; there are published certified figures, and they are close enough to distillation for the purpose.

Take the AquaTru Carafe's IAPMO performance data sheet as a worked example, because the whole table is public. Against a 750 mg/L TDS challenge the system is certified to reduce dissolved solids to a permissible 22 mg/L, with a minimum reduction of 94.5%. Fluoride goes from an 8 mg/L challenge to the 1.5 mg/L limit at 96.4% average. Nitrate averages 98.3%, lead 99.2%, pentavalent arsenic 98.8%.

A distiller would get the TDS figure closer to zero. The question is whether the difference between 22 mg/L and near-zero is worth five and a half hours of waiting and a heating element per gallon — and for drinking water, it is not. For a humidifier or a CPAP reservoir, where mineral scale is the entire problem, it might be.

The mineral question on reverse osmosis is covered properly on its own page, and remineralizing systems exist precisely for people who want the dissolved solids put back after the membrane has done its work. That option has no equivalent on a distiller.

When a distiller is genuinely the right purchase

There is a real list here, and it is worth stating clearly because the answer to the page's title question is often "yes, and you need it for something that is not drinking".

A CPAP machine, where the manual specifies distilled water. This is the most common legitimate reason, and the specification is about scale in the humidifier chamber rather than about health. Reverse osmosis water at 22 mg/L is very low but it is not distilled, and the manual is the authority on what voids the warranty.

Nasal rinsing — with an important correction. Distilled or sterile water is one of the accepted options, but a distiller does not make sterile water: the collection bottle, the air and your hands are all recontamination routes. The cyst page covers what CDC and FDA actually accept for sinus rinsing, and store-bought sterile water or a one-minute boil is the simpler answer.

Steam irons, humidifiers and aquarium top-off. Anywhere water evaporates and leaves its minerals behind, dissolved solids are the problem and removing all of them is the point.

Laboratory or hobby work with a stated purity requirement. If a procedure specifies distilled water, use distilled water.

Notice that drinking is not on that list, and that most of the list is about scale rather than about safety.

Why distilled water tastes the way it does

This is the practical objection people raise after they buy one, and it has a clean explanation worth knowing in advance.

Dissolved minerals are most of what water tastes like. Remove them all and what is left reads as flat — the common descriptions are "empty" or "like nothing", which is accurate rather than imaginative. Health Canada's 500 mg/L aesthetic objective is a ceiling for the same reason that very low figures taste odd: the agency is managing complaints about taste at both ends of a range.

If you have been drinking distilled water and dislike it, that is the mechanism, and the fix is either a remineralizing stage or a different technology. It is also, incidentally, why coffee made with distilled water extracts badly — the coffee page covers the published mineral targets for brewing, and zero is well below all of them.