Water For Baby Formula: Which Type To Use And Precautions To Take


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Preparing baby formula isn’t complex, provided you know the basics right. Out of a few essential things to follow, selecting the right water type is preeminent. Generally, you may consider using tap water or bottled water. However, you need to check its quality since water with high mineral content or contaminants could affect a baby’s health.

This post answers all your queries and tells you about the safety of different water types to prepare a safe baby formula.

Can You Use Tap Water To Make Baby Formula?

The US Environmental Protection Agency (EPA) regulates tap water quality by testing it for over 90 different contaminants (1). Thus, in most places in the US, tap water is safe for drinking. According to the American Academy of Pediatrics (AAP), if your tap water is safe, you can mix powdered formula with tap water to prepare formula milk (2).

However, if you are unsure about its safety, it is advisable to boil cold tap water to a rolling boil for no more than one minute and then cool the water at room temperature for no more than 30 minutes before use. Boiling tap water is necessary to kill any disease-causing organisms, such as bacteria, viruses, and parasites, present in the water (3).

Can You Use Bottled Water To Make Baby formula?

Yes, you can. If you are unsure about the quality of tap water, you can use boiled bottled water to make baby formula. However, some experts recommend avoiding bottled water as it may contain large amounts of sodium or sulfate. If you use bottled water, check the label, and ensure that the sodium (Na) level is less than 200mg, and the sulfate (SO or SO4) level is less than 250mg per liter (4).

Bottled distilled water is a better alternative since it may contain fewer contaminants than mineral or spring water that usually have added minerals (5). Another bottled water option that parents might consider for preparing baby formula is nursery water. Nursery water is bottled distilled water with added fluoride curated especially for babies. While it is quite suitable for babies, nursery water might be expensive and less readily available than other alternatives.

Can You Use Distilled Water To Make Baby Formula?

Yes, you can use distilled water to prepare baby formula (5). Distilled water can be prepared at home by collecting steam in a clean container and cooling it into water (3). You may also use domestic/household water distillers. Since the water is derived from steam, it is usually unlikely to have any contaminants.

You may purchase bottled distilled water available at supermarkets. Pick distilled water meant for human consumption and not those made for industrial use. Distilled water usually does not require boiling. If you suspect possible contamination of bottled distilled water, you may boil it.

Can You Use Well Water To Make Baby Formula?

If the well water is certified as safe by a state-certified laboratory, you may use boiled well water to prepare baby formula. The EPA is responsible for the safety of public water supply, and the safety rules do not apply to privately-owned drinking water systems, such as wells (6) (7). Therefore, it is the well owner’s responsibility to ensure the quality and safety of the well water.

The EPA does not monitor well water safety, but several state-certified laboratories may offer services to test well water for a fee. You may check with your state or local environmental or health department for more information.

If you are unsure of the safety certification of the well water or suspect the well water might be contaminated for some reason, then choose tap, bottled, or distilled water to prepare baby formula. Some experts advise against using well water for formula due to the lack of constant monitoring of well water’s safety (8).

What About The Fluoride In Water?

Fluoride is a vital mineral that helps prevent cavities and is naturally present in water and certain foods. Drinking water is usually fluoridated. The US Public Health Service recommends drinking water to contain 0.7mg of fluoride per liter of water (5).

Excess of fluoride beyond the recommended value may cause dental fluorosis, whereas too little could pose a tooth decay risk. Both conditions are irreversible. Thus, parents and caregivers should check the fluoride levels in the drinking water and the baby formula. Knowing the fluoride levels can ensure your baby isn’t getting too much or too little fluoride.

If your infant is exclusively consuming formula mixed with fluoride water, then you can sometimes use low-fluoride bottled water to mix infant formula, to lessen the risk of fluoride excess. Bottled water with low fluoride content is usually labeled as deionized, demineralized, or purified. You may also use distilled water, which does not contain fluoride ( (9). Alternatively, you may also consider low-fluoride baby formulas.

When To Boil Water For Formula Preparation?

The American Academy of Pediatrics recommends boiling water if you are unsure of the safety of tap water (10). Bottled and packaged distilled water may not require boiling, but it is safe to do so to avoid any risk of waterborne illness. Distilled water is the safest option to use when boiling water isn’t possible (8).

Do note that boiling water neither removes particulate matter, nor does it eliminate dissolved compounds, such as nitrates. If the water is cloudy or dirty, it must be filtered before boiling. Well water tends to have a high level of nitrates, a compound that may increase the risk of methemoglobinemia, a blood disorder, in babies (11). Make sure to know the dissolved compounds in water before boiling and using it for baby formula.

Precautions To Take While Using Water For Baby Formula

Here are some tips to ensure you safely use water for preparing the baby formula.

  1. Discuss the safest water option with your pediatrician as recommendations and water safety norms may vary as per the location.
  1. Boil well water, tap water, and bottled water before using it to prepare the formula. Distilled water could be boiled if contamination is suspected.
  1. Boiling water is necessary even if you are using a home filtration system, such as reverse osmosis.
  1. Always use clean utensils to boil water and use a sterilized feeding bottle to prepare the formula.
  1. Avoid boiling water for more than a minute as it could concentrate the impurities in the water. Let the boiled water come to room temperature by setting it aside for 30 minutes. Do not leave the water out for long as it could lead to bacterial contamination.
  1. Always test the water temperature before feeding the baby. You can drop a few drops on the inside of your wrist to check the water temperature.
  1. Mix the quantity of water and formula recommended by the manufacturer or the pediatrician. Adding excess water or formula powder could cause overfeeding or underfeeding.

Water is an important component of infant formula, and it is essential for it to be clean. There are several safe choices, such as tap water and distilled water. If you are unsure about the safety of water, boil it before use. You can also get your local water supply tested to determine the dissolved compounds. Discuss with your pediatrician about alternating between water types to mitigate the risk of fluoride excess.


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