How to Remove Fluoride From Water: Methods That Work
Reverse osmosis, distillation, activated alumina and bone char are the methods our sources say remove fluoride from water. Ordinary activated carbon pitcher filters and boiling do not. A reverse osmosis system certified to NSF/ANSI 58 for fluoride reduction must lower a fluoride test challenge to no more than 1.5 mg/L. The table below gives the evidence.
Key numbers
0.7 mg/L
U.S. Public Health Service recommendation
The U.S. Public Health Service recommends 0.7 mg/L for community water systems that add fluoride.
Verified
1.5 mg/L
WHO guideline value
The World Health Organization's guideline value for fluoride in drinking water is 1.5 mg/L.
Verified
1.5 mg/L
National Toxicology Program (2024)
NTP's 2024 monograph concluded, with moderate confidence, that drinking water containing more than 1.5 mg/L is associated with lower IQ in children.
Verified
2.0 mg/L
EPA secondary standard (non-enforceable)
EPA's secondary (non-enforceable) standard for fluoride is 2.0 mg/L, and exceeding it requires a special public notice.
Verified
4.0 mg/L
EPA maximum contaminant level (enforceable)
EPA's enforceable maximum contaminant level (MCL) for fluoride is 4.0 mg/L, and its health goal (MCLG) is also 4.0 mg/L.
Verified
Fluoride removal methods compared
Each row gives what a cited source says about one method.
Pitcher filters built on activated carbon are in a “Does not remove fluoride” row.
The table compares whether each method works, not what it costs: this page gives no cost figures.
| Method | Removes fluoride? | Evidence | Reduction | Certification claim |
|---|---|---|---|---|
| Reverse osmosis | Removes fluoride | Idaho DEQ states that point-of-use distillation and reverse osmosis have proven effective for removing fluoride. (Idaho Department of Environmental Quality) EPA lists activated alumina and reverse osmosis, applied at the treatment plant, as the best available technologies for meeting its fluoride limit. (U.S. EPA, 40 CFR 142.61 (via LII)) | To be certified for fluoride reduction under NSF/ANSI 58, a reverse osmosis system must lower a fluoride test challenge to no more than 1.5 mg/L. (Health Canada) | An NSF/ANSI 58 (reverse osmosis) listing can carry the claim "Fluoride Reduction": EcoWater Systems' ERO-175 listing carries it. (NSF International) |
| Distillation | Removes fluoride | Idaho DEQ states that point-of-use distillation and reverse osmosis have proven effective for removing fluoride. (Idaho Department of Environmental Quality) | No figure on this page | No certification claim on this page |
| Activated alumina | Removes fluoride | EPA lists activated alumina and reverse osmosis, applied at the treatment plant, as the best available technologies for meeting its fluoride limit. (U.S. EPA, 40 CFR 142.61 (via LII)) | No figure on this page | No certification claim on this page |
| Bone char | Removes fluoride | The World Health Organization notes that bone char (bone charcoal) can take up fluoride from water. (World Health Organization) | No figure on this page | No certification claim on this page |
| Activated carbon (pitcher and standard carbon filters) | Does not remove fluoride | Idaho DEQ states that typical charcoal-based filters, such as pitcher filters, do not remove fluoride. (Idaho Department of Environmental Quality) | No figure on this page | No certification claim on this page |
| Boiling | Does not remove fluoride | Idaho DEQ states that boiling water does not remove fluoride. (Idaho Department of Environmental Quality) A study in Mexico, cited in Environmental Health Perspectives, found that boiled water had double the fluoride concentration of unboiled water. (Environmental Health Perspectives vol. 113 (Erdal & Buchanan; published online 2004-09-14)) | No figure on this page | No certification claim on this page |
Which certification covers fluoride reduction
WQA, which runs the Gold Seal testing and certification program, says a certified product has undergone evaluation and testing to verify that it will perform as its certified claims indicate. An NSF/ANSI 58 (reverse osmosis) listing can carry the claim "Fluoride Reduction": EcoWater Systems' ERO-175 listing carries it.
To be certified for fluoride reduction under NSF/ANSI 58, a reverse osmosis system must lower a fluoride test challenge to no more than 1.5 mg/L. The standard sets that pass mark; it is not a removal percentage for any one system.
On NSF's NSF/ANSI 58 listing for EcoWater Systems, each certified model has its own row with its own claims.
Methods that do not remove fluoride
Idaho DEQ states that typical charcoal-based filters, such as pitcher filters, do not remove fluoride.
Idaho DEQ states that boiling water does not remove fluoride. What boiling does to the fluoride left in the water is covered on its own page.
Options without installing anything
A standard activated carbon pitcher is one of the methods that does not remove fluoride.
Which bottled waters contain fluoride, by type and brand, is set out on our bottled water page.
Do I need to remove fluoride?
This page does not answer that question for you. What each health authority says about fluoride at each level, and which questions the evidence leaves open, is set out on our health-effects page.
More on fluoride
Sources
- Health Canada. “Guidelines for Canadian Drinking Water Quality: Guideline Technical Document – Fluoride (page 3)”. https://www.canada.ca/en/health-canada/services/publications/healthy-living/guidelines-canadian-drinking-water-quality-guideline-technical-document-fluoride/page-3-guidelines-canadian-drinking-water-quality-guideline-technical-document-fluoride.html (Verified )
- U.S. Department of Health and Human Services Federal Panel on Community Water Fluoridation (Public Health Reports 2015;130(4):318–331). “U.S. Public Health Service Recommendation for Fluoride Concentration in Drinking Water for the Prevention of Dental Caries”. https://pmc.ncbi.nlm.nih.gov/articles/PMC4547570/ (Verified )
- World Health Organization. “Guidelines for drinking-water quality: fourth edition incorporating the first and second addenda (2022)”. https://iris.who.int/handle/10665/352532 (Verified )
- National Toxicology Program (NIEHS). “Fluoride Exposure: Neurodevelopment and Cognition”. https://ntp.niehs.nih.gov/whatwestudy/assessments/noncancer/completed/fluoride (Verified )
- U.S. Environmental Protection Agency. “Secondary Drinking Water Standards: Guidance for Nuisance Chemicals”. https://www.epa.gov/sdwa/secondary-drinking-water-standards-guidance-nuisance-chemicals (Verified )
- U.S. Environmental Protection Agency. “National Primary Drinking Water Regulations”. https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations (Verified )
- Idaho Department of Environmental Quality. “Contaminants in Drinking Water”. https://www.deq.idaho.gov/water-quality/drinking-water/contaminants-in-drinking-water/ (Verified )
- U.S. EPA, 40 CFR 142.61 (via LII). “40 CFR § 142.61 Variances from the maximum contaminant level for fluoride”. https://www.law.cornell.edu/cfr/text/40/142.61 (Verified )
- NSF International. “NSF/ANSI 58 Listings: EcoWater Systems LLC”. https://info.nsf.org/Certified/DWTU/Listings.asp?Standard=058&CompanyName=EcoWater+Systems+LLC (Verified )
- World Health Organization. “Fluoride in Drinking-water (Fawell et al., 2006), §5.2 Bone charcoal”. https://iris.who.int/handle/10665/43514 (Verified )
- Environmental Health Perspectives vol. 113 (Erdal & Buchanan; published online 2004-09-14). “A Quantitative Look at Fluorosis, Fluoride Exposure, and Intake in Children Using a Health Risk Assessment Approach”. https://pmc.ncbi.nlm.nih.gov/articles/PMC1253719/ (Verified )
- Water Quality Association. “Product Certification”. https://wqa.org/product-certification/ (Verified )
Last reviewed by TapWaterData Editorial. How we verify
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"How to Remove Fluoride From Water: Methods That Work". TapWaterData, last reviewed 2026-10-11. https://www.tapwaterdata.com/fluoride/how-to-remove