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EWG's Tap Water Database — 2021 UPDATE

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Fluoride

Belleville Waterworks

Fluoride occurs naturally in surface and groundwater and is also added to drinking water by many water systems. Read More.

Fluoride has been promoted as a chemical that reduces dental cavities. Yet it is now well-established that fluoride primarily exerts its protective effects through topical mechanisms, such as sodium fluoride in toothpaste and mouthwash. In contrast, long-term ingestion of fluoride in water increases dental fluorosis, which includes mottling, pitting and weakening of the teeth. EPA's maximum legal limit is set at 4 parts per million (ppm) to prevent skeletal fluorosis, a condition where bones become brittle and more susceptible to fractures, although these effects may occur at lower doses.

Even fluoride levels of 0.7 ppm, the amount of fluoride in drinking water recommended by the U.S. Public Health Service, can result in too much fluoride for bottle-fed babies. EWG recommends that caregivers mix baby formula with fluoride-free water. The National Toxicology Program is investigating the potential for low doses of fluoride to alter thyroid function and childhood brain development.

 

152

Samples

1

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.572 ppm26260.0500 ppm - 0.800 ppm
20150.641 ppm24240.428 ppm - 0.800 ppm
20160.647 ppm24240.500 ppm - 0.876 ppm
20170.915 ppm26260.400 ppm - 6.50 ppm
20180.523 ppm2825ND - 1.000 ppm
20190.615 ppm24240.398 ppm - 0.831 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 4 ppm

ppm = parts per million

All test results

Date Lab ID Result
2014-01-151164010010.600 ppm
2014-01-151164010010.664 ppm
2014-02-051186690010.400 ppm
2014-02-051186690010.653 ppm
2014-03-041217100010.700 ppm
2014-03-041217100010.729 ppm
2014-04-101272110010.500 ppm
2014-04-101272110010.500 ppm
2014-05-061306910010.500 ppm
2014-05-061306910010.515 ppm
2014-06-041368220010.669 ppm
2014-06-041368220010.800 ppm
2014-07-091442070010.500 ppm
2014-07-091442070010.642 ppm
2014-08-121507300010.700 ppm
2014-08-121507300010.722 ppm
2014-09-031547920010.678 ppm
2014-09-031547920010.700 ppm
2014-09-088161370.0500 ppm
2014-09-088161410.0670 ppm
2014-10-061614780010.554 ppm
2014-10-061614780010.600 ppm
2014-11-031663430010.600 ppm
2014-11-031663430010.711 ppm
2014-12-021705700010.500 ppm
2014-12-021705700010.629 ppm
2015-01-071747610010.600 ppm
2015-01-071747610010.695 ppm
2015-02-091786510010.700 ppm
2015-02-091786510010.765 ppm
2015-03-101826640010.745 ppm
2015-03-101826640010.800 ppm
2015-04-061859990010.428 ppm
2015-04-061859990010.600 ppm
2015-05-131932800010.700 ppm
2015-05-131932800010.720 ppm
2015-06-101988460010.600 ppm
2015-06-101988460010.645 ppm
2015-07-062032680010.600 ppm
2015-07-062032680010.603 ppm
2015-08-112109190010.688 ppm
2015-08-112109190010.700 ppm
2015-09-222191150010.597 ppm
2015-09-222191150010.600 ppm
2015-10-072224870010.597 ppm
2015-10-072224870010.600 ppm
2015-11-032267360010.600 ppm
2015-11-032267360010.616 ppm
2015-12-162330630010.593 ppm
2015-12-162330630010.600 ppm
2016-01-112351110010.500 ppm
2016-01-112351110010.564 ppm
2016-02-032382040010.623 ppm
2016-02-032382040010.700 ppm
2016-03-032421310010.566 ppm
2016-03-032421310010.600 ppm
2016-04-052468770010.600 ppm
2016-04-052468770010.635 ppm
2016-05-102534010010.569 ppm
2016-05-102534010010.600 ppm
2016-06-062579030010.652 ppm
2016-06-062579030010.700 ppm
2016-07-122654140010.696 ppm
2016-07-122654140010.700 ppm
2016-08-042703800010.696 ppm
2016-08-042703800010.700 ppm
2016-09-062754290010.500 ppm
2016-09-062754290010.583 ppm
2016-10-242853330010.500 ppm
2016-10-242853330010.626 ppm
2016-11-142887080010.800 ppm
2016-11-142887080010.852 ppm
2016-12-072919180010.700 ppm
2016-12-072919180010.876 ppm
2017-01-032945160010.700 ppm
2017-01-032945160010.770 ppm
2017-02-062984600010.800 ppm
2017-02-062984600010.865 ppm
2017-03-203048850010.896 ppm
2017-03-203048850011.000 ppm
2017-04-033070690010.700 ppm
2017-04-033070690010.819 ppm
2017-05-013125510010.600 ppm
2017-05-013125510010.617 ppm
2017-06-123208640011.000 ppm
2017-06-123208640011.17 ppm
2017-07-243303990010.517 ppm
2017-07-243303990010.600 ppm
2017-08-023327330010.459 ppm
2017-08-023327330010.500 ppm
2017-09-073405000010.561 ppm
2017-09-073405000010.600 ppm
2017-09-2010197220.730 ppm
2017-09-2010197196.50 ppm
2017-10-093474510010.600 ppm
2017-10-093474510010.649 ppm
2017-11-083532830010.400 ppm
2017-11-083532830010.417 ppm
2017-12-043568920010.600 ppm
2017-12-043568920010.717 ppm
2018-01-093619630010.600 ppm
2018-01-093619630010.601 ppm
2018-02-083660820010.598 ppm
2018-02-083660820011.000 ppm
2018-03-0510434270.0500 ppm
2018-03-053692050010.582 ppm
2018-03-053692050010.600 ppm
2018-04-093749570010.400 ppm
2018-04-093749570010.524 ppm
2018-05-221056926ND
2018-05-303851120010.700 ppm
2018-05-303851120010.764 ppm
2018-06-123879170010.700 ppm
2018-06-123879170010.719 ppm
2018-07-093925170010.400 ppm
2018-07-093925170010.437 ppm
2018-08-134003370010.441 ppm
2018-08-134003370010.500 ppm
2018-09-104059480010.641 ppm
2018-09-104059480010.700 ppm
2018-09-191081875ND
2018-10-171087871ND
2018-10-224155480010.600 ppm
2018-10-224155480010.703 ppm
2018-11-074185810010.693 ppm
2018-11-074185810010.700 ppm
2018-12-044223310010.500 ppm
2018-12-044223310010.502 ppm
2019-01-074261900010.398 ppm
2019-01-074261900010.500 ppm
2019-02-254327480010.546 ppm
2019-02-254327480010.700 ppm
2019-03-054336910010.551 ppm
2019-03-054336910010.700 ppm
2019-04-164406870010.593 ppm
2019-04-164406870010.600 ppm
2019-05-084447900010.601 ppm
2019-05-084447900010.700 ppm
2019-06-124514020010.567 ppm
2019-06-124514020010.700 ppm
2019-07-184584290010.522 ppm
2019-07-184584290010.600 ppm
2019-08-264657880010.800 ppm
2019-08-264657880010.831 ppm
2019-09-094681430010.800 ppm
2019-09-094681430010.825 ppm
2019-10-144760070010.525 ppm
2019-10-144760070010.600 ppm
2019-11-144815340010.415 ppm
2019-11-144815340010.500 ppm
2019-12-184868470010.579 ppm
2019-12-184868470010.600 ppm