Skip to content
What Filter Removes

Which water filters remove fluoride?

7 of the 96 water filters we track are certified to reduce fluoride (NSF/ANSI 58 listings). The lowest-priced is the AquaTru Carafe (countertop reverse osmosis, $375). Counting a year of replacement filters, the cheapest to own is the Brondell Circle RC100 ($664 the first year). 24 more claim it from brand-run lab tests only, which is not certification.

The EPA legal limit (MCL) for fluoride in public drinking water is 4 mg/L.

Source note

MCL and MCLG 4.0 mg/L (set 1986). Separate non-enforceable secondary standard 2.0 mg/L (cosmetic dental fluorosis). epa.gov

Lowest-priced certified filter, by type

Countertop reverse osmosis

AquaTru Carafe

$375 to buy · NSF/ANSI 58

Check price at AquaTru →

Under-sink reverse osmosis

Brondell Circle RC100

$450 to buy · $214/yr for 2 · NSF/ANSI 58

Check price at Brondell →

Certified to reduce fluoride (7)

Each row is a certifier listing for this exact product with fluoride in its reduction claims; the listing is linked. Yearly cost is replacement filters (plus drain water for RO) for 2 people, from each brand's filter prices and ratings.

FilterTypeListingPriceFilters a year
AquaTru Carafe Countertop reverse osmosis IAPMO R&T, NSF/ANSI 58 $375 — Check price at AquaTru
Brondell Circle RC100 Under-sink reverse osmosis WQA, NSF/ANSI 58 $450 $214 Check price at Brondell
AquaTru Classic Countertop reverse osmosis IAPMO R&T, NSF/ANSI 58 $475 — Check price on Amazon
Aquasana SmartFlow RO Under-sink reverse osmosis WQA, NSF/ANSI 58 $480 $321 Check price on Amazon
Waterdrop G3P600 Under-sink reverse osmosis IAPMO R&T, NSF/ANSI 58 $539 $147 Check price on Amazon
Waterdrop G3P800 Under-sink reverse osmosis IAPMO R&T, NSF/ANSI 58 $999 $161 Check price on Amazon
A. O. Smith RO with Microbial Boost AO-US-RO-MB-4000 Under-sink reverse osmosis IAPMO R&T, NSF/ANSI 58 — $270 Check price at A. O. Smith

Brand tests only, not certified (24)

These brands cite a lab report for fluoride, but no certifier lists the claim for the product. A lab report can be real; it is not an independent, ongoing certification with factory audits.

No fluoride claim (65 filters)

Common questions

Which water filters remove fluoride?

7 of the 96 water filters we track are certified to reduce fluoride (NSF/ANSI 58 listings). The lowest-priced is the AquaTru Carafe (countertop reverse osmosis, $375). Counting a year of replacement filters, the cheapest to own is the Brondell Circle RC100 ($664 the first year). 24 more claim it from brand-run lab tests only, which is not certification.

Is there a legal limit for fluoride in tap water?

The EPA legal limit (MCL) for fluoride in public drinking water is 4 mg/L. EPA is running an expedited review: preliminary assessment plan Jan 22, 2026; toxicity-assessment protocol Aug 2026; draft assessment to follow for public comment; no proposed MCL change as of 2026-10-23. Whether to fluoridate is a state/local decision.

How do I know a filter really removes fluoride?

Look it up in the certifier's public database (NSF, WQA, IAPMO or CSA) under the exact model, and check that fluoride is in its list of reduction claims (usually under NSF/ANSI 58). "Tested to NSF standards" in an ad is not the same as a listing.