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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

Lebanon

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.

 

27

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.120 ppm41ND - 0.480 ppm
20130.933 ppm660.710 ppm - 1.42 ppm
2014N/A00N/A
2015N/A00N/A
20160.223 ppm134ND - 1.30 ppm
20170.165 ppm43ND - 0.260 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
2012-01-26AB63905ND
2012-04-25AB69351ND
2012-07-24AB783480.480 ppm
2012-10-18AB85074ND
2013-02-19AB921630.900 ppm
2013-02-19AB921641.08 ppm
2013-02-19AB921650.710 ppm
2013-02-19AB921660.740 ppm
2013-02-19AB921671.42 ppm
2013-02-19AB921680.750 ppm
2016-02-29AC665631.30 ppm
2016-02-29AC66564ND
2016-02-29AC66565ND
2016-02-29AC66567ND
2016-02-29AC66566ND
2016-02-29AC665680.210 ppm
2016-02-29AC66569ND
2016-03-25AC690460.710 ppm
2016-03-25AC69033ND
2016-04-04AC70292ND
2016-04-04AC702930.680 ppm
2016-08-02AC80038ND
2016-10-12AC85441ND
2017-01-30AC893140.260 ppm
2017-04-17AC94652ND
2017-07-18AD017180.220 ppm
2017-10-24AD080550.180 ppm