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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

City of Kearney

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.

 

80

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.807 ppm13130.753 ppm - 0.905 ppm
20130.780 ppm14140.727 ppm - 0.892 ppm
20140.807 ppm13130.731 ppm - 0.914 ppm
20150.952 ppm13130.857 ppm - 1.03 ppm
20160.905 ppm14140.335 ppm - 1.01 ppm
20170.896 ppm13130.808 ppm - 0.991 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
2012-01-031505360.774 ppm
2012-02-061573890.905 ppm
2012-03-051615490.847 ppm
2012-04-091649090.842 ppm
2012-05-071747290.867 ppm
2012-06-041788750.776 ppm
2012-07-021840880.813 ppm
2012-07-091864970.774 ppm
2012-08-061919180.769 ppm
2012-09-171970870.785 ppm
2012-10-012022000.753 ppm
2012-11-132086450.777 ppm
2012-12-032126800.803 ppm
2013-01-072165210.831 ppm
2013-01-222179010.749 ppm
2013-02-112217830.789 ppm
2013-03-042249480.777 ppm
2013-04-012284010.764 ppm
2013-05-062368940.756 ppm
2013-06-032409550.727 ppm
2013-07-012446340.746 ppm
2013-07-152478760.803 ppm
2013-08-122533430.757 ppm
2013-09-032585930.757 ppm
2013-10-072643420.892 ppm
2013-11-042707510.797 ppm
2013-12-092755070.773 ppm
2014-01-062806920.756 ppm
2014-02-032857390.731 ppm
2014-03-102896000.758 ppm
2014-04-072930460.793 ppm
2014-05-052988700.749 ppm
2014-06-023049590.793 ppm
2014-07-073087990.822 ppm
2014-07-143113940.742 ppm
2014-08-043166690.881 ppm
2014-09-023223210.849 ppm
2014-10-063272460.833 ppm
2014-11-123346680.865 ppm
2014-12-013381490.914 ppm
2015-01-123421790.924 ppm
2015-02-093478090.968 ppm
2015-03-023506640.914 ppm
2015-04-133555480.928 ppm
2015-05-113633400.916 ppm
2015-06-013676180.857 ppm
2015-07-133719101.000 ppm
2015-07-203770370.966 ppm
2015-08-103801331.01 ppm
2015-09-083853801.03 ppm
2015-10-133904010.976 ppm
2015-11-163973620.942 ppm
2015-12-074012690.940 ppm
2016-01-040.335 ppm
2016-01-040.958 ppm
2016-02-010.813 ppm
2016-03-070.851 ppm
2016-04-110.912 ppm
2016-05-090.961 ppm
2016-06-130.895 ppm
2016-07-110.996 ppm
2016-07-180.992 ppm
2016-08-151.01 ppm
2016-09-060.995 ppm
2016-10-170.962 ppm
2016-11-070.993 ppm
2016-12-120.993 ppm
2017-01-090.924 ppm
2017-02-060.868 ppm
2017-03-130.920 ppm
2017-04-100.991 ppm
2017-05-080.808 ppm
2017-06-120.901 ppm
2017-07-100.852 ppm
2017-07-310.919 ppm
2017-08-080.894 ppm
2017-09-110.906 ppm
2017-10-090.933 ppm
2017-11-130.889 ppm
2017-12-040.849 ppm