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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

City of Junction City

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.

 

26

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.502 ppm550.460 ppm - 0.580 ppm
20130.423 ppm440.280 ppm - 0.590 ppm
20140.295 ppm440.260 ppm - 0.390 ppm
20150.400 ppm440.270 ppm - 0.490 ppm
20160.378 ppm440.180 ppm - 0.480 ppm
20170.182 ppm53ND - 0.540 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
2012-01-24572766BT0.470 ppm
2012-04-10577288BT0.460 ppm
2012-07-081467420.490 ppm
2012-07-24582368BT0.510 ppm
2012-10-16586708BT0.580 ppm
2013-02-05592052BT0.590 ppm
2013-04-17594791BT0.500 ppm
2013-08-07600786BT0.280 ppm
2013-10-22604823BT0.320 ppm
2014-02-18632050.260 ppm
2014-04-08933910.260 ppm
2014-05-051090890.270 ppm
2014-10-212167650.390 ppm
2015-01-132610690.490 ppm
2015-04-073090920.270 ppm
2015-07-143666020.400 ppm
2015-10-204201120.440 ppm
2016-01-124752150.380 ppm
2016-04-125265730.480 ppm
2016-07-125808930.180 ppm
2016-10-196454740.470 ppm
2017-01-17679312ND
2017-04-047338070.190 ppm
2017-05-10759592ND
2017-07-127961900.180 ppm
2017-10-308688860.540 ppm