Is Distilled Water Safe to Drink? An Honest Answer from a GTA Distiller

Every June, a wave of the same question hits Google in Canada: is distilled water safe to drink? Some people are asking because they bought a CPAP machine and the manual says “distilled only.” Some are asking because a video told them distilled water “leaches minerals from your body.” Some are asking because they keep a jug for the iron and started wondering if it would be alright to pour a glass instead. The question is fair, and it deserves a real answer rather than a marketing dodge.

Here is the short answer. Yes, distilled water is safe for healthy adults to drink. It is the same water used for sterile compounding in pharmacies, in hospital autoclaves, and in many of the bottled “nursery waters” sold on Canadian retail shelves. Puretap has been distilling water in the GTA for four decades, and our 4 L Morning Mist jugs are bought every week by households, dental offices, kitchens, labs, and clinics for drinking, cooking, and equipment use. The honest, fuller answer takes a few minutes to walk through — because there is a real reason the question keeps coming up, and the right answer depends on how you are drinking it, not just whether you can.

Why People Ask: Distilled Water Has No Minerals

Distilled water is, by design, very close to a pure substance. It is produced by boiling water to steam and condensing it back to liquid, leaving the dissolved minerals, salts, and most contaminants behind in the boiler. What comes out has essentially no calcium, no magnesium, no sodium, no chloride, no iron, and no measurable hardness. In the GTA, where tap water typically lands between 120 and 160 parts per million of total dissolved solids — most of that calcium and magnesium from the limestone bedrock — distilled water represents a real change in what your glass contains.

That difference is exactly why distilled is the right choice for steam irons, CPAP humidifiers, lead-acid batteries, autoclaves, and dental practices. It is also why some sources have raised an eyebrow about drinking it day after day. The most commonly cited source is a 2005 review prepared for the World Health Organization on demineralised drinking water, which noted that very-low-mineral water consumed as the sole source of hydration for long periods may not provide the same incidental mineral intake as mineral-rich water. That review is the origin of most of the “distilled is bad for you” content circulating online.

What the Science Actually Says

The WHO review is real, the concern is reasonable, and it also does not describe the way most Canadians drink water. Here are the two things that matter, in plain language.

First, hydration works the same way. A glass of water hydrates you whether it contains 5 mg/L of calcium or zero. The body absorbs water through the gut wall by osmosis and active transport — minerals in the water are not what drives that. Drinking distilled water does not pull minerals out of healthy tissue. The “leaching” claim is based on a misreading of how osmotic balance works in the digestive tract, where the water is mixed with everything else you have eaten long before it is absorbed.

Second, most of your minerals come from food, not water. A cup of milk, a slice of cheese, a serving of leafy greens, a piece of salmon, a handful of almonds — any of these contain orders of magnitude more calcium and magnesium than a litre of even mineral-rich water. Health Canada’s Dietary Reference Intakes for adults are 1,000 to 1,200 mg of calcium per day; a litre of GTA tap water contributes roughly 30 to 40 mg of that, which is real but small. If you eat a typical Canadian diet, switching from tap water to distilled water does not put your mineral intake at risk.

The WHO concern applies to a narrower situation: people whose only source of hydration is demineralised water and who also have a mineral-poor diet — for example, in some humanitarian or institutional settings. That is a real public-health consideration. It is not what happens when a person in Mississauga, North York, or Etobicoke pours a glass of distilled water with dinner.

Where Remineralisation Actually Does Matter

There are three situations where mineral content matters enough to talk about specifically. None of them are reasons to avoid distilled water — they are reasons to use it the right way.

High-performance athletic recovery. Endurance athletes who lose significant electrolytes through sweat over hours of exertion benefit from sodium and potassium in their recovery drink, not pure water. That is what a sports drink is for. If distilled water is your everyday drink at the desk and at meals, the swap to an electrolyte mix during a long ride is the right move regardless of what is in your main jug.

Infant formula preparation. Public-health guidance on what water to use for mixing infant formula varies by source and by jurisdiction. Mayer Bros Nursery Water, sold at Walmart Canada with bilingual English/French labelling, is distilled water with the explicit disclaimer “Not sterile. Use as directed by physician or by labeling directions for use of infant formula.” If you are preparing formula for an infant, follow your paediatrician’s guidance and the formula manufacturer’s directions, full stop. We have a more detailed post on the Canadian alternatives here.

Specialty coffee and espresso. Pure distilled water at zero mineral content is not the right choice for serious espresso on its own, because espresso extraction is partly driven by the buffering effect of bicarbonate and the flavour-binding role of calcium and magnesium. The Specialty Coffee Association publishes a target range of 75–250 ppm total dissolved solids, with a sweet spot near 150 ppm. The serious move for cafés and home espresso enthusiasts is distilled water plus a measured remineralisation pack, which gives you a clean, repeatable starting point and the exact mineral profile you want. We cover this in detail in our post on what tap water does to your espresso machine.

What Distilled Water Is Right For — No Asterisks

For everything below, distilled water is not just safe; it is the right answer. These are settled, uncontested uses where mineral-free water performs better than tap or filtered water, and where Puretap supplies homes and businesses across the GTA every week.

• CPAP humidifier reservoirs. Mineral build-up clouds the chamber and shortens the life of the heater plate.
• Steam irons and garment steamers. Calcium and magnesium are exactly what scales and clogs the steam ports.
• Room humidifiers and vaporisers. Distilled prevents the fine white mineral dust that coats furniture.
• Lead-acid batteries. Topping up cells with anything other than distilled introduces minerals that interfere with the electrochemistry.
• Aquariums (with a remineralisation pack). Distilled gives you a known starting point so you can build the exact water chemistry your livestock needs.
• Sensitive houseplants. Orchids, carnivorous plants, bonsai, and many tropicals are sensitive to the chlorine, chloramine, and dissolved salts in tap water. Venus flytraps in particular are killed by mineral build-up over weeks.
• Dental practice and pharmacy compounding. Autoclaves, ultrasonic baths, and sterile compounding all specify distilled.
• Skincare formulation and lab work. Cosmetics formulators, soap-makers, and small-batch lab work all need a known-purity starting water.

Beyond these settled uses, plenty of people in the GTA simply prefer the clean, neutral taste of distilled water for drinking. There is nothing unsafe about that choice. We deliver 4 L jugs by the case across the GTA, and we have customers who have been buying them for the kitchen counter for more than a decade.

How to Drink Distilled Water Without Overthinking It

If you have decided to drink distilled water at home and you want a simple framework, here is the one we share with new customers.

Eat a normal mixed diet — vegetables, dairy or fortified alternatives, protein, fruit. That covers the calcium, magnesium, sodium, and potassium your body needs regardless of what is in your glass. Drink to thirst, plus the usual 1.5 to 2.5 litres per day pattern most adults settle into. If you are running, cycling, or working outside on a hot GTA summer day, add electrolytes to your bottle during the activity. That is the same advice that applies whether you drink tap, filtered, spring, or distilled water — the source of your drinking water does not change the basic shape of a healthy hydration habit.

And if you are buying distilled water specifically for an appliance — CPAP, iron, humidifier — you do not have to commit to anything else. Many of our customers buy a case of 4 L jugs every few weeks just for the equipment and never pour themselves a glass. That is a fine reason to be a Puretap customer too.

Get Puretap Distilled Water Delivered Across the GTA

Puretap has been making distilled water in the GTA for four decades. We deliver 4 L Morning Mist jugs by the case to homes and businesses across Toronto, Mississauga, Brampton, Markham, Vaughan, Richmond Hill, Oakville, Burlington, and the rest of the GTA. We also stock spring water, deionised water, 18-litre cooler bottles, 500 mL retail bottles, and bulk wholesale formats.

Browse the distilled water range, see what GTA delivery looks like in your area, or get in touch through our contact page, by email at info@puretap.ca, or by phone at 905-670-7400. We answer questions about water for a living. If you have one we have not covered here, ask us.

Related Puretap posts: Hard water in the GTA · Why some appliances say “no distilled water” · What tap water does to your espresso machine