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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

City of Royse City

NOTE: City of Royse City purchases water from North Texas Municipal Water District Wylie Water Treatment Plant which is required to test for fluoride. Sample information shown below was taken by North Texas Municipal Water District Wylie Water Treatment Plant.

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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.563 ppm330.500 ppm - 0.660 ppm
20130.537 ppm330.360 ppm - 0.760 ppm
20140.807 ppm330.806 ppm - 0.810 ppm
20150.410 ppm330.304 ppm - 0.471 ppm
20160.307 ppm330.214 ppm - 0.430 ppm
20170.266 ppm220.263 ppm - 0.268 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

NOTE: City of Royse City purchases water from North Texas Municipal Water District Wylie Water Treatment Plant which is required to test for fluoride. Sample information shown below was taken by North Texas Municipal Water District Wylie Water Treatment Plant.

Date Lab ID Result
2012-02-0712022480010.660 ppm
2012-06-0612061840020.500 ppm
2012-06-0612061840010.530 ppm
2013-02-2713029060030.360 ppm
2013-02-2713029060020.760 ppm
2013-02-2713029060010.490 ppm
2014-01-28Q14027510050.806 ppm
2014-01-28Q14027510040.806 ppm
2014-01-28Q14027510030.810 ppm
2015-05-21Q15188170060.456 ppm
2015-05-21Q15188170050.471 ppm
2015-11-19Q15460940030.304 ppm
2016-05-02Q16172860030.430 ppm
2016-05-02Q16172860020.276 ppm
2016-05-02Q16172860010.214 ppm
2017-06-22Q17262450040.263 ppm
2017-06-22Q17262450080.268 ppm