Fluoride

Health Effects

At levels above 4.0 mg/L: bone disease (skeletal fluorosis). At levels above 2.0 mg/L: dental fluorosis (mottled teeth) in children. EPA also has a secondary standard of 2.0 mg/L. Most U.S. water systems add fluoride at 0.7 mg/L for dental health.

Source: EPA National Primary Drinking Water Regulations

Where It Comes From

Water additive used to promote strong teeth (community water fluoridation at 0.7 mg/L). Also occurs naturally from erosion of natural deposits. Some discharge from fertilizer and aluminum factories.

Where It's Commonly Found

Added intentionally to approximately 73% of U.S. public water systems. Naturally elevated in some groundwater in the western U.S. and parts of the Great Plains.

Nearly all fluoridated community water systems contain fluoride at 0.7 mg/L (intentional). Systems exceeding the MCL of 4.0 mg/L are rare but exist in areas with naturally high fluoride geology.

How to Remove It

Filters That Address Fluoride

11 filters in our database list Fluoride reduction.

Clearly Filtered Pitcher

pitcher

NSF42NSF53*NSF401*P473*

$90

$165/yr filters

Price checked Apr 2026

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Clearly Filtered 3-Stage Under Sink

under sink

NSF42NSF53NSF401P473

$495

$440/yr filters

Price checked Apr 2026

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iSpring RCC7AK

under sink ro

NSF58

$198

$81/yr filters

Price checked Apr 2026

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Waterdrop G3P800

under sink ro

NSF42NSF53NSF58NSF372

$999

$166/yr filters

Price checked Sep 2026

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Waterdrop G3P600

under sink ro

NSF42NSF53NSF58NSF372

$539

$155/yr filters

Price checked Sep 2026

Buy at Waterdrop

Waterdrop D6

under sink ro

$399

$100/yr filters

Price checked Sep 2026

Buy at Waterdrop

Waterdrop X16

under sink ro

NSF42NSF58NSF372

$1999

$185/yr filters

Price checked Sep 2026

Buy at Waterdrop

Aquasana SmartFlow Reverse Osmosis

under sink ro

NSF42NSF53P473NSF58NSF401

$159.99

$340/yr filters

Price checked Sep 2026

Buy at Aquasana