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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

Bethany Crest LLC

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.

 

77

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND80ND
2013ND160ND
2014ND120ND
2015ND150ND
2016ND140ND
2017ND120ND

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
2012-01-24S382430ND
2012-03-07S382431ND
2012-04-09S386154ND
2012-05-16S386279ND
2012-05-23S388241ND
2012-06-20S387407ND
2012-07-18S387513ND
2012-10-16S430958ND
2013-01-17S388306ND
2013-02-05S82653ND
2013-03-13S474188ND
2013-04-23S430915ND
2013-05-13S479343ND
2013-06-12S479419ND
2013-06-17S503117ND
2013-07-01S505076ND
2013-08-05S514670ND
2013-08-07S511940ND
2013-09-05S522758ND
2013-09-09S522765ND
2013-10-02S522980ND
2013-10-03S522988ND
2013-11-04S522601ND
2013-12-09S535926ND
2014-01-27S536058ND
2014-02-11S548544ND
2014-03-25S548168ND
2014-04-10S548202ND
2014-05-07S570503ND
2014-06-25S575567ND
2014-07-07S570634ND
2014-08-19S576559ND
2014-09-17S576485ND
2014-10-09S590546ND
2014-11-12S601751ND
2014-12-01S601383ND
2015-01-28S616158ND
2015-02-03S616804ND
2015-02-26S616089ND
2015-03-17S616150ND
2015-04-22S619935ND
2015-05-20S632146ND
2015-06-04S641178ND
2015-07-09S641723ND
2015-07-14S641701ND
2015-08-18S641352ND
2015-09-23S641420ND
2015-10-06S654117ND
2015-11-17S632135ND
2015-12-09S660614ND
2015-12-14S660668ND
2016-01-14S676196ND
2016-02-11S659538ND
2016-02-15S669819ND
2016-02-18S669844ND
2016-03-02S679461ND
2016-04-19S679592ND
2016-05-18S669890ND
2016-06-08S670057ND
2016-07-20S670150ND
2016-08-22S703973ND
2016-09-14S671347ND
2016-10-04S660837ND
2016-11-21S703668ND
2016-12-08S709478ND
2017-01-25S7238567ND
2017-02-08S695084ND
2017-03-16S723585ND
2017-04-19S720628ND
2017-05-17S740337ND
2017-06-12S740388ND
2017-07-20S751617ND
2017-08-17S751431ND
2017-09-20S756973ND
2017-10-18S763257ND
2017-11-08S763319ND
2017-12-06S781148ND