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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

City of North Platte

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
20130.397 ppm220.341 ppm - 0.452 ppm
20140.458 ppm10100.355 ppm - 0.648 ppm
2015N/A00N/A
20160.421 ppm220.372 ppm - 0.470 ppm
20170.459 ppm220.376 ppm - 0.541 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
2013-05-012306130.452 ppm
2013-05-012306140.341 ppm
2014-03-192814350.501 ppm
2014-03-192814410.411 ppm
2014-03-192814400.355 ppm
2014-03-192814390.505 ppm
2014-03-192814380.459 ppm
2014-03-192814370.441 ppm
2014-03-192814360.408 ppm
2014-03-192814440.494 ppm
2014-03-192814420.648 ppm
2014-06-023064670.356 ppm
2016-05-020.372 ppm
2016-05-020.470 ppm
2017-01-090.541 ppm
2017-04-170.376 ppm