Fluoride is in most American tap water, and for decades almost nobody questioned it. Now more people are asking what it does in the body, whether it is safe for a baby's bottle, and how to get it out of the water they drink every day. This guide covers what fluoride is, the known side effects, what the newest federal research found, and the ways to remove fluoride from water at home.

Why Is Fluoride in Water?

Fluoride is a mineral found naturally in rock, soil and groundwater. Starting in the 1940s, many US cities began adding it to public water to help prevent tooth decay. Today the federal recommendation for community water is 0.7 milligrams per liter.

Some water carries more than that on its own. Private wells in certain regions pick up natural fluoride from the ground, sometimes at levels well above what cities add. The EPA's enforceable limit for public water is 4.0 milligrams per liter.

The policy is no longer settled. In 2025, Utah and Florida became the first states to end community water fluoridation, and the debate has reached city councils across the country.

Fluoride Side Effects

The side effects of fluoride depend on how much you take in and for how long. These are the ones with the strongest evidence:

• Dental fluorosis. Too much fluoride while teeth are still forming leaves white streaks or spots on the enamel. In more severe cases the teeth stain brown. It happens in childhood, while the adult teeth develop.
• Skeletal fluorosis. Years of high exposure can build fluoride up in the bones, leading to stiff, painful joints. It is rare in the US and tied to high natural levels, usually in well water.
• Effects on children's brain development. This is the newest concern, covered below.
• Thyroid questions. Some studies have looked at fluoride and thyroid function. The research is still developing and the results are mixed.

Fluoride toxicity

Acute fluoride toxicity is different from long-term exposure. It comes from swallowing a large amount at once, most often a child getting into toothpaste or fluoride supplements. Signs include nausea, vomiting and stomach pain. If a child swallows a large amount of a fluoride product, call Poison Control at 1-800-222-1222 right away.

Why this matters to us

In 1987, eWater founder Fred Van Liew nearly lost his infant son to fluoride and metals poisoning, from the local water his wife drank during pregnancy and while nursing. Fred thought he was protected: he had bought what he was told was the best water filter for his home. No one told him what that filter would not remove. That gap sent him into years of research on what every type of filter does and doesn't take out, and it is why every filter we carry is built for a specific purpose and does what it is supposed to do.

What the Newest Research Found

In 2024 the National Toxicology Program finished a multi-year review of fluoride and brain development. It concluded, with moderate confidence, that drinking water with more than 1.5 milligrams of fluoride per liter is associated with lower IQ in children.

That level is about twice what US cities add. The same review said there was not enough data to tell whether the 0.7 level used in community water affects children's IQ. So the honest answer is that the question is open, and many families would rather not wait for it to close.

Fluoride in Water for Babies

Babies are where the most caution makes sense. An infant who drinks formula takes in far more water for their size than an adult, and their teeth are still forming under the gums.

Health agencies note that mixing powdered or concentrated formula with fluoridated water can raise the chance of mild dental fluorosis. The common advice is to use low-fluoride water for formula at least part of the time. Look for bottled water labeled purified, distilled, deionized, demineralized or reverse osmosis, or filter your tap water with a method that removes fluoride. Talk with your pediatrician about what is right for your baby.

Fluoride in Bottled Water

Switching to bottled water does not guarantee you avoid fluoride. Spring and mineral waters carry whatever fluoride was in the source, and some brands add it on purpose. Bottled water with added fluoride has to say so on the label, but natural fluoride often goes unlisted. If a brand does not tell you, check its water quality report or contact the company.

Bottled water also gets expensive fast, and it means a lot of plastic. For most homes, filtering at the tap is the simpler long-term answer.

How to Remove Fluoride From Water

Fluoride is harder to filter than chlorine. It dissolves completely and the particles are tiny, so the basic carbon filter in most refrigerators and big box pitchers does very little to it. These are the methods that work:

Reverse osmosis

Reverse osmosis pushes water through a membrane so fine that dissolved minerals like fluoride are left behind, along with lead, arsenic, bacteria and much more. It is the most dependable way to remove fluoride from drinking water, and it installs under the kitchen sink. Our EZTwist 5 Stage RO filters through five stages, removes fluoride, and uses twist-off canisters, so changing filters is quick and you never touch the filter itself.

Bone char carbon

Bone char is a specialized carbon that is particularly good at reducing fluoride, and unlike RO it can treat every tap in the house. Our Whole Home Filtration System pairs bone char with catalytic carbon and KDF-55 to reduce fluoride while removing chlorine and chloramines, so the water you shower and bathe in is filtered too.

Fluoride reducing pitchers and bottles

If you rent, or you are not ready to install anything, a filter built for fluoride is the easy start. Our Fluoride Reducing Filter Pitcher reduces fluoride along with chlorine, heavy metals and chemicals, while keeping helpful trace minerals. For travel, the Fluoride Reducing Filter Squeeze Bottle uses the same idea in a light bottle you can pack.

Distillation

A countertop distiller boils water and collects the steam, leaving fluoride behind. It works, but it is slow, uses electricity, and strips out every mineral along with it.

Does boiling water remove fluoride?

No. This is one of the most repeated mistakes online. Boiling drives off water as steam, but fluoride stays in the pot, so boiled water ends up with slightly more fluoride, not less.

Frequently Asked Questions

Is fluoride in tap water safe?

Health agencies say the level added to US community water is safe for teeth, and the federal review found too little data to judge that level for children's IQ. Higher levels have known side effects. If you would rather not drink it, filtering it out is simple.

What are the side effects of fluoride?

Dental fluorosis from too much fluoride in childhood is the most common. Long-term high exposure can cause skeletal fluorosis, and federal research links water above 1.5 milligrams per liter to lower IQ in children.

Should I use fluoride-free water for baby formula?

Many families do, at least part of the time, to lower the chance of dental fluorosis. Use water labeled distilled, purified or reverse osmosis, or filtered water from a reverse osmosis system, and ask your pediatrician.

Do regular water filters remove fluoride?

Most basic carbon filters do not. You need reverse osmosis, bone char, activated alumina, distillation, or a filter made specifically to reduce fluoride.

What is the best way to remove fluoride from water?

Reverse osmosis is the most dependable for drinking water. A whole home system with bone char reduces fluoride at every tap. See all of our options in Water Filters, or start with the EZTwist RO or the Fluoride Reducing Filter Pitcher.