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EWG's Tap Water Database

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Fluoride

Warminster Municipal Authority

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.

 

30

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2010N/A00N/A
2011N/A00N/A
20120.00588 ppm171ND - 0.1000 ppm
2013N/A00N/A
2014N/A00N/A
20150.00923 ppm131ND - 0.120 ppm

ppm = parts per million.

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 4 ppm

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppm = parts per million.

EPA Maximum Contaminant
Level Goal (MCLG)4 ppm

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppm = parts per million.

All test results

Date Lab ID Result
2012-02-229953679001ND
2012-02-2299536790170.1000 ppm
2012-02-229953679016ND
2012-02-229953679006ND
2012-02-229953679015ND
2012-02-229953679014ND
2012-02-229953679013ND
2012-02-229953679012ND
2012-02-229953679011ND
2012-02-229953679010ND
2012-02-229953679002ND
2012-02-229953679003ND
2012-02-229953679004ND
2012-02-229953679005ND
2012-02-229953679007ND
2012-02-229953679008ND
2012-02-229953679009ND
2015-04-0612620005ND
2015-04-0612619933ND
2015-04-0612619993ND
2015-04-0612619981ND
2015-04-06126199690.120 ppm
2015-04-0612619957ND
2015-04-0612619945ND
2015-04-0612619921ND
2015-04-0612619909ND
2015-04-0612619897ND
2015-04-0612619885ND
2015-04-0612619873ND
2015-04-0612620017ND