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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

Palm Beach County Water Utilities

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.

 

36

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.732 ppm440.635 ppm - 0.840 ppm
20130.461 ppm440.150 ppm - 0.823 ppm
20140.607 ppm440.175 ppm - 0.828 ppm
20150.427 ppm880.0700 ppm - 0.805 ppm
20160.379 ppm880.0840 ppm - 0.720 ppm
20170.639 ppm880.571 ppm - 0.720 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 Result
2012-05-070.635 ppm
2012-05-090.638 ppm
2012-05-100.840 ppm
2012-05-140.813 ppm
2013-05-130.171 ppm
2013-05-160.150 ppm
2013-05-200.823 ppm
2013-05-220.700 ppm
2014-05-150.735 ppm
2014-05-200.175 ppm
2014-05-220.688 ppm
2014-05-290.828 ppm
2015-06-160.686 ppm
2015-06-160.148 ppm
2015-06-160.686 ppm
2015-06-160.148 ppm
2015-06-170.0700 ppm
2015-06-170.0700 ppm
2015-06-220.805 ppm
2015-06-220.805 ppm
2016-05-040.599 ppm
2016-05-040.599 ppm
2016-05-110.0840 ppm
2016-05-110.0840 ppm
2016-05-170.720 ppm
2016-05-170.720 ppm
2016-08-150.111 ppm
2016-08-150.111 ppm
2017-05-030.571 ppm
2017-05-030.571 ppm
2017-05-100.720 ppm
2017-05-100.720 ppm
2017-05-170.676 ppm
2017-05-170.676 ppm
2017-05-300.589 ppm
2017-05-300.589 ppm