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The short answer
Fluoride in drinking water is added by many US water systems at 0.7 mg/L to prevent tooth decay, and it also occurs naturally, sometimes at higher levels in wells. Federal health agencies have long supported fluoridation, but a 2024 federal toxicology review linked higher levels, above 1.5 mg/L, to lower IQ in children, the EPA is reassessing its limit, and two states have stopped fluoridation. Boiling doesn’t remove fluoride; certified reverse osmosis does. Our picks are in the best water filters for fluoride.
Why is fluoride added to tap water?
Community water fluoridation in the US started in 1945, and the CDC calls it one of 10 great public health interventions of the 20th century. The US Public Health Service recommends 0.7 mg/L as the level that maximizes the oral health benefit while minimizing potential harms. That recommendation isn’t an enforceable standard; whether to fluoridate is decided by states and local systems.
Is fluoride in drinking water safe?
What’s settled, and what’s still being studied:
- Dental fluorosis: changes in tooth enamel that develop only in children while their teeth are forming, up to about age 8 (CDC).
- High levels: the EPA’s 4.0 mg/L limit protects against bone disease (pain and tenderness of the bones) and mottled teeth in children (EPA). A non-enforceable 2.0 mg/L guideline addresses tooth discoloration (EPA).
- Children’s IQ: in August 2024 the National Toxicology Program concluded with moderate confidence that fluoride levels above 1.5 mg/L are associated with lower IQ in children. It found insufficient data to determine whether 0.7 mg/L affects IQ.
Where do the fluoride rules stand in 2026?
| Action | Status |
|---|---|
| EPA limit (4.0 mg/L) | In place. The EPA began reviewing new science in April 2025 and released a preliminary assessment plan in January 2026 to inform any future revision. |
| Federal court case | A 2024 district court ruling that fluoridation at 0.7 mg/L posed an unreasonable risk under the Toxic Substances Control Act was vacated and sent back by the Ninth Circuit on May 21, 2026. |
| Utah | Bans adding fluoride to public water systems (H.B. 81, effective May 7, 2025). |
| Florida | Prohibits water additives that don’t meet a new statutory definition, which ends fluoridation (SB 700, effective July 1, 2025). |
| CDC recommendation | CDC pages still list 0.7 mg/L. HHS announced in April 2025 that it would direct the CDC to stop recommending fluoridation (Congressional Research Service). |
| Fluoride supplements | In October 2025 the FDA announced enforcement action against unapproved ingestible fluoride drugs for young children. |
How do you find your fluoride level?
Your utility’s annual water quality report, delivered each year by July 1, lists fluoride. On a private well, use a state-certified lab, since natural fluoride can be higher in some groundwater.
How do you remove fluoride from water?
Boiling won’t remove fluoride; it only concentrates it as water evaporates. Effective methods include reverse osmosis, distillation, anion exchange, and activated alumina, while softeners, carbon filters, and sediment filters can’t adequately remove it (Manitoba Water Stewardship). For a home filter, choose one certified for fluoride. Ordinary pitchers and fridge filters aren’t; the Culligan ZeroWater is the one pitcher we found that is.
| # | Filter | Score | Certified by | Lead | PFAS | Fluoride | Running cost | Price |
|---|---|---|---|---|---|---|---|---|
| 01 | AquaTru CarafeBest overallCountertop RO | 4.6 | IAPMO R&T | Certified | Certified | Certified | $0.33/gal | $356.25on Amazon › |
| 02 | Waterdrop G3P800Best under-sink, tanklessUnder-sink RO | 4.3 | IAPMO R&T | Certified | Certified | Certified | About $160/yr | $849.00on Amazon › |
| 03 | APEC RO-90Lowest filter costUnder-sink RO | 4.2 | WQA | Certified | No | Certified | $60 to $75/yr | $219.16on Amazon › |
| 04 | Culligan ZeroWaterBest pitcherPitcher | 4.2 | IAPMO R&T | Certified | Certified | Certified | $0.68 to $0.93/gal | See priceat Culligan › |
| 05 | iSpring RCC7AK-BNBest budget with alkaline stageUnder-sink RO | 3.9 | NSF International | Certified | Claim | Certified | $100 to $140/yr | $234.99on Amazon › |
Certified: Certified by an independent body (named in each pick). Lab test: Tested by a named independent lab, not certified. Claim: The maker's claim, not certified. No: No claim. PFAS means PFOA/PFOS, or Total PFAS where the pick says so.
Common questions
Does boiling water remove fluoride?
No. Boiling concentrates fluoride as water evaporates (Manitoba Water Stewardship). Use a filter certified for fluoride, such as certified reverse osmosis.
Do Brita or fridge filters remove fluoride?
No. Brita pitcher filters and the fridge filters we checked aren’t certified for fluoride. See our fluoride filter guide.
Is fluoride in water linked to lower IQ?
The National Toxicology Program found, with moderate confidence, that levels above 1.5 mg/L are associated with lower IQ in children, and insufficient data on 0.7 mg/L (NTP). The EPA is reassessing its limit.
Which states have banned fluoride in water?
Utah, from May 7, 2025 (H.B. 81), and Florida, whose additive law took effect July 1, 2025 (SB 700).
Should I filter fluoride for my baby?
Ask your pediatrician. The CDC says families can consider a filter that removes fluoride (CDC); see the best water for baby formula.
Sources
- CDC: Community water fluoridation recommendations
- CDC: About community water fluoridation
- CDC: Fluoridation FAQ
- National Toxicology Program: Fluoride and neurodevelopment (2024)
- EPA: National primary drinking water regulations
- EPA: Secondary drinking water standards
- EPA: Review of new science on fluoride (April 2025)
- EPA: Fluoride assessment fact sheet (January 2026)
- Ninth Circuit: Food & Water Watch v. EPA, No. 25-384 (May 21, 2026)
- Congressional Research Service: R48539
- HHS: FDA action on unapproved fluoride drugs (October 2025)
- Utah H.B. 81 (2025)
- Florida SB 700 (2025)
- Manitoba Water Stewardship: Fluoride fact sheet
- IAPMO R&T product listing directory
- NSF International listings
- WQA certified product listings
Prices as of October 14, 2026. Product prices and availability are accurate as of the date/time indicated and are subject to change. As an Amazon Associate we earn from qualifying purchases.