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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

Lake Geneva Utility Commission

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.

 

148

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.812 ppm24240.700 ppm - 0.900 ppm
20130.723 ppm24240.645 ppm - 0.830 ppm
20140.687 ppm26260.150 ppm - 0.890 ppm
20150.739 ppm24240.680 ppm - 0.911 ppm
20160.724 ppm24240.657 ppm - 0.785 ppm
20170.705 ppm26260.652 ppm - 0.741 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
2012-01-04IW0115760.880 ppm
2012-01-04IW0115760.890 ppm
2012-02-01IW0122390.790 ppm
2012-02-01IW0122390.820 ppm
2012-03-01IW0132470.790 ppm
2012-03-01IW0132470.840 ppm
2012-04-02IW0147950.800 ppm
2012-04-02IW0147950.850 ppm
2012-05-01IW0169160.800 ppm
2012-05-01IW0169160.860 ppm
2012-06-04IW0198550.740 ppm
2012-06-04IW0198550.770 ppm
2012-07-03IX0003820.890 ppm
2012-07-03IX0003820.900 ppm
2012-08-01IX0032190.800 ppm
2012-08-01IX0032190.850 ppm
2012-09-04IX0063120.800 ppm
2012-09-04IX0063120.840 ppm
2012-10-02IX0092190.790 ppm
2012-10-02IX0092190.810 ppm
2012-11-01IX0110170.700 ppm
2012-11-01IX0110170.760 ppm
2012-12-03IX0123240.730 ppm
2012-12-03IX0123240.780 ppm
2013-01-07IX0137180.830 ppm
2013-01-07IX0137180.830 ppm
2013-02-07IX0150470.730 ppm
2013-02-07IX0150470.750 ppm
2013-03-06IX0163820.680 ppm
2013-03-06IX0163820.700 ppm
2013-04-01IX0181000.720 ppm
2013-04-01IX0181000.730 ppm
2013-05-02707620010.750 ppm
2013-05-02707620010.818 ppm
2013-06-03765550010.710 ppm
2013-06-03765550010.809 ppm
2013-07-01832110010.670 ppm
2013-07-01832110010.670 ppm
2013-08-01891240010.692 ppm
2013-08-01891240010.720 ppm
2013-09-03951720010.645 ppm
2013-09-03951720010.690 ppm
2013-10-021020100010.695 ppm
2013-10-021020100010.780 ppm
2013-11-011069300010.652 ppm
2013-11-011069300010.670 ppm
2013-12-021112990010.657 ppm
2013-12-021112990010.760 ppm
2014-01-081156400010.769 ppm
2014-01-081156400010.890 ppm
2014-02-031185070010.717 ppm
2014-02-031185070010.780 ppm
2014-03-031214980010.721 ppm
2014-03-031214980010.795 ppm
2014-04-021261310010.692 ppm
2014-04-021261310010.770 ppm
2014-05-021311720010.622 ppm
2014-05-021311720010.760 ppm
2014-06-031372180010.658 ppm
2014-06-031372180010.690 ppm
2014-06-107956550.150 ppm
2014-06-107956580.150 ppm
2014-07-021430370010.692 ppm
2014-07-021430370010.780 ppm
2014-08-051500210010.701 ppm
2014-08-051500210010.790 ppm
2014-09-091566060010.672 ppm
2014-09-091566060010.780 ppm
2014-10-031614520010.700 ppm
2014-10-031614520010.719 ppm
2014-11-041674120010.660 ppm
2014-11-041674120010.696 ppm
2014-12-021711520010.746 ppm
2014-12-021711520010.750 ppm
2015-01-071749790010.720 ppm
2015-01-071749790010.753 ppm
2015-02-021783220010.720 ppm
2015-02-021783220010.770 ppm
2015-03-101833060010.753 ppm
2015-03-101833060010.760 ppm
2015-04-061871400010.680 ppm
2015-04-061871400010.712 ppm
2015-05-131935880010.783 ppm
2015-05-131935880010.786 ppm
2015-06-081982980010.758 ppm
2015-06-081982980010.911 ppm
2015-07-072042550010.750 ppm
2015-07-072042550010.764 ppm
2015-08-042099470010.680 ppm
2015-08-042099470010.729 ppm
2015-09-092165640010.680 ppm
2015-09-092165640010.710 ppm
2015-10-022214050010.700 ppm
2015-10-022214050010.724 ppm
2015-11-022267260010.700 ppm
2015-11-022267260010.730 ppm
2015-12-012309540010.720 ppm
2015-12-012309540010.749 ppm
2016-01-062349220010.720 ppm
2016-01-062349220010.741 ppm
2016-02-032383210010.760 ppm
2016-02-032383210010.763 ppm
2016-03-012422380010.690 ppm
2016-03-012422380010.731 ppm
2016-04-072476680010.760 ppm
2016-04-072476680010.785 ppm
2016-05-022519240010.710 ppm
2016-05-022519240010.711 ppm
2016-06-012577830010.700 ppm
2016-06-012577830010.715 ppm
2016-07-052646500010.657 ppm
2016-07-052646500010.670 ppm
2016-08-012696680010.687 ppm
2016-08-012696680010.710 ppm
2016-09-012754270010.740 ppm
2016-09-012754270010.768 ppm
2016-10-042827220010.748 ppm
2016-10-042827220010.770 ppm
2016-11-022873480010.710 ppm
2016-11-022873480010.720 ppm
2016-12-052914170010.706 ppm
2016-12-052914170010.710 ppm
2017-01-092958540010.652 ppm
2017-01-092958540010.700 ppm
2017-02-042984310010.680 ppm
2017-02-042984310010.688 ppm
2017-03-013020660010.700 ppm
2017-03-013020660010.701 ppm
2017-04-053083930010.691 ppm
2017-04-053083930010.730 ppm
2017-05-083145030010.710 ppm
2017-05-083145030010.740 ppm
2017-06-023197860010.680 ppm
2017-06-023197860010.708 ppm
2017-07-053262520010.730 ppm
2017-07-053262520010.741 ppm
2017-07-2610068170.660 ppm
2017-07-2610068140.670 ppm
2017-08-083345350010.700 ppm
2017-08-083345350010.726 ppm
2017-09-053404740010.710 ppm
2017-09-053404740010.738 ppm
2017-10-033467520010.730 ppm
2017-10-033467520010.732 ppm
2017-11-013520830010.720 ppm
2017-11-013520830010.728 ppm
2017-12-043573960010.664 ppm
2017-12-043573960010.690 ppm