Distilled Water for Babies and Infant Formula: What to Know

By Megahome Editorial Team· October 2, 2026 · 8 min read

TL;DR

Many parents use distilled water for formula, and the US CDC lists it among the low-fluoride options. But distilled water is not sterile, so keep following your local preparation steps (such as boiling or using water at 70 °C or more) and agree the choice with your paediatrician.

Short answer: yes, many parents prepare infant formula with distilled water, and the US Centers for Disease Control and Prevention (CDC) lists distilled water among the low-fluoride options for mixing formula. But distilled water is not sterile, and powdered formula itself is not sterile either — so distilled water does not replace the preparation steps your health authority recommends. Which water is right for your baby is a decision to make with your paediatrician or health visitor.

This article is general information, not medical advice. Always follow your paediatrician, the instructions on your formula and your local health authority.

Can you use distilled water for baby formula?

In general, yes. The water in a bottle has two jobs: to come from a safe source, and to dissolve the formula in exactly the proportion printed on the tin. The CDC's guidance simply says to use water from a safe source — filtered or unfiltered — and to contact your local health department if you are unsure whether your tap water is safe.

Water from a well-maintained distiller is about as plain as water gets. A distiller boils water and collects the condensed steam, leaving behind what cannot evaporate. The CDC lists bacteria, viruses, parasites and many chemicals — including lead, nitrate, sodium, sulfate, calcium and magnesium — among the things distillation removes.

What distillation does not do is make water sterile. Once the water reaches the collection bottle it is exposed to air and to whatever is on the bottle and spout, and the CDC notes that bacteria can grow on a distiller's cooling coils when it is not in use. Separately, the CDC states that powdered infant formula is not sterile and can sometimes contain germs such as Cronobacter. That is why the hot-water step in formula preparation still matters, whatever water you start with.

Why do some parents choose distilled water?

In many areas, public tap water is perfectly suitable for formula, and health services such as the UK's NHS build their advice around it. Parents who choose distilled water usually have a specific reason:

Fluoride. The CDC explains that powdered or concentrated formula mixed with fluoridated water may increase the chance of mild dental fluorosis (faint white marks on teeth that are still forming). It suggests that parents can use low-fluoride bottled water — labelled de-ionised, purified, demineralised or distilled — some of the time to lessen this risk. Ready-to-feed formula carries minimal risk.
Nitrate. The CDC warns that high levels of nitrates in water can make people, and especially babies, sick. Nitrate is a concern mainly for private wells in farming areas. Boiling does not remove it — it concentrates it as water evaporates — whereas in a distiller it stays behind in the boiling chamber.
Lead from old pipes. The US Environmental Protection Agency (EPA) is clear that boiling water does not remove lead. Distillation leaves metals such as lead in the chamber.
Sodium and sulphate. The NHS says bottled water is not usually recommended for formula partly because it may contain too much sodium or sulphate. Distillation removes both.
Consistency. Some families simply want the same, known water every time — at home, when visiting relatives or while travelling.

If any of these apply to you, a water test or a call to your water supplier is a good first step, so that you and your paediatrician are working from facts rather than worry.

What do health authorities say about water for formula?

Advice differs between countries, so it is worth knowing what your own health service recommends. Here is how three widely used sources describe it:

Source	Which water	Hot-water step
US CDC	Water from a safe source, filtered or unfiltered; in an emergency use bottled water until authorities say tap water is safe	For babies younger than 2 months, born prematurely or with a weakened immune system: boil the water, wait about five minutes, then mix
NHS (UK)	Fresh tap water that has not been boiled before; bottled water not usually recommended; no artificially softened water	Boil, then cool for no more than 30 minutes so the water stays at 70 °C or above
WHO and FAO	Guidelines on safe preparation, storage and handling of powdered infant formula	Sets out reconstitution temperature, cooling and holding times (commonly summarised as water at 70 °C or more)

Notice that the NHS advice is written around tap water. If you live in the UK and want to use distilled water instead, mention it to your health visitor and keep following the 70 °C step. In Japan, Taiwan, the Gulf and elsewhere, follow your national health authority and the instructions printed on your formula.

How to prepare formula with distilled water: a practical checklist

Check with your paediatrician first, especially if your baby was born prematurely, has a medical condition or uses a specialised formula.
Wash your hands and clean and sanitise the bottles. A distiller produces pure water; it does not sterilise bottles, teats or equipment.
Use fresh water from a clean, covered collection bottle rather than water that has stood open.
Heat the water as your local guidance says — for example, the CDC's “boil, then wait about five minutes”, or the NHS's “at least 70 °C”.
Measure the water first, then add the powder, exactly as the tin says. Never add extra water or extra powder.
Cool the bottle to feeding temperature and check it before feeding.
Use it promptly. The CDC advises using prepared formula within 2 hours of preparation and within 1 hour of starting a feed; if you will not use it straight away, refrigerate it and use it within 24 hours. Throw away anything left after a feed.

How do you keep a distiller “baby-ready”?

A distiller only delivers clean water if the distiller itself is clean. These habits come from Megahome's instruction manual and from what owners report:

Keep the collection bottle clean and covered. After a break of a few days, clean the unit and bottle before you start again.
Replace the activated-carbon sachet within 25 days, as the manual states — sooner if the water tastes or smells unusual.
Descale at least once a month with citric acid, more often in hard-water areas. Scale reduces efficiency and, according to owners, is the most common reason the thermal reset switch trips early.
Plan ahead. One batch makes 4 litres and owners report roughly 4.5–6 hours per batch, so run it before you need it rather than at 3 a.m. Expect an audible fan and a slightly warmer room.
No timer needed. The distiller switches itself off automatically; please do not use a plug-in timer — damage caused by one is not covered by the warranty.
Know what it is not. A home distiller is a household appliance, not a medical device or a steriliser. Its water is pure, not sterile.

Does a baby need minerals from the water?

Infant formula is made to be a baby's complete source of nutrition when it is mixed as directed — which is exactly why the ratio on the tin matters so much. The water is there to carry the formula, not to supplement it. If you have questions about your baby's nutrition, fluoride or iron needs, your paediatrician or dentist is the right person to ask. For older children and adults, our article is distilled water safe to drink every day? looks at what the WHO and other authorities say about low-mineral water.

Why the build of the distiller matters

Everything the steam leaves behind stays in the boiling chamber, so the materials that touch the water matter. Megahome has made countertop distillers in Tainan, Taiwan, since 1992, with stainless-steel boiling chambers and steam domes, an activated-carbon post-filter and a choice of glass or PP collection bottle. As of September 2026, Megahome distillers have around 5,000 Amazon ratings averaging 4.5–4.7 stars. You can compare the MH-943TWS and the MH-943SBS, or find a dealer on our where to buy page. If you are on a private well, read can you use a water distiller with well water?, and for fluoride and lead in detail, see does a water distiller remove fluoride, lead and PFAS?

Key takeaways

Distilled water can be used to prepare infant formula, and the CDC lists it as a low-fluoride option — agree the choice with your paediatrician.
Distilled water is pure but not sterile, and powdered formula is not sterile either: keep the hot-water step your local guidance recommends.
Distillation leaves nitrate, lead, sodium and sulphate in the boiling chamber; boiling alone does not remove nitrate or lead.
Measure water first, follow the tin's ratio exactly, and use prepared formula within the times your health authority gives.
Keep the distiller clean: carbon sachet within 25 days, descale at least monthly, clean the bottle, and no plug-in timer.

Frequently asked questions

Do I still need to boil distilled water for formula?

Follow your local guidance. Home-distilled water is not sterile and powdered formula is not sterile either, so authorities such as the CDC (for young or vulnerable babies) and the NHS still recommend a hot-water step — boiling, or water at 70 °C or more — before mixing.

Is distilled water better than tap water for formula?

Not automatically. Where public tap water is safe, it is suitable for formula, and the NHS builds its advice around it. Distilled water can help when you want to lower fluoride, or when nitrate, lead or old pipes are a concern. Your paediatrician can help you weigh it up.

Can I give my baby plain distilled water to drink?

Whether and when a baby needs extra water is a question for your paediatrician. Never use water to dilute formula beyond the ratio on the tin.

Can a water distiller sterilise baby bottles?

No. A home distiller produces pure water but it is not a steriliser or a medical device. Clean and sanitise bottles, teats and equipment as your health authority recommends.

Will my baby miss out on fluoride?

Distillation removes fluoride, which is why the CDC mentions distilled water as a low-fluoride option. Whether your child needs fluoride from another source as they grow is a question for your paediatrician or dentist.

Sources

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