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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

City of Stuart - Water 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.

 

114

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.437 ppm21210.310 ppm - 0.582 ppm
20130.383 ppm17170.220 ppm - 0.480 ppm
20140.387 ppm18180.310 ppm - 0.460 ppm
20150.484 ppm18180.430 ppm - 0.560 ppm
20160.437 ppm12120.330 ppm - 0.550 ppm
20170.386 ppm2827ND - 0.510 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 Result
2012-01-190.453 ppm
2012-01-190.452 ppm
2012-02-270.460 ppm
2012-02-270.470 ppm
2012-03-130.450 ppm
2012-03-130.450 ppm
2012-04-270.470 ppm
2012-04-270.520 ppm
2012-05-230.390 ppm
2012-05-230.440 ppm
2012-06-060.440 ppm
2012-06-150.428 ppm
2012-06-150.423 ppm
2012-07-180.413 ppm
2012-07-180.401 ppm
2012-08-230.310 ppm
2012-08-230.310 ppm
2012-09-200.540 ppm
2012-09-200.582 ppm
2012-10-290.410 ppm
2012-10-290.370 ppm
2013-02-260.387 ppm
2013-02-260.369 ppm
2013-05-290.280 ppm
2013-05-290.280 ppm
2013-06-140.350 ppm
2013-06-250.251 ppm
2013-06-250.220 ppm
2013-08-270.380 ppm
2013-08-270.380 ppm
2013-09-210.480 ppm
2013-09-210.480 ppm
2013-10-240.480 ppm
2013-10-240.480 ppm
2013-11-190.460 ppm
2013-11-190.410 ppm
2013-12-190.430 ppm
2013-12-190.400 ppm
2014-03-120.350 ppm
2014-03-120.340 ppm
2014-04-070.310 ppm
2014-04-080.330 ppm
2014-05-210.440 ppm
2014-05-210.440 ppm
2014-06-240.380 ppm
2014-06-240.380 ppm
2014-07-070.430 ppm
2014-07-280.380 ppm
2014-07-280.370 ppm
2014-08-180.360 ppm
2014-08-200.380 ppm
2014-11-050.310 ppm
2014-11-050.450 ppm
2014-12-020.390 ppm
2014-12-020.460 ppm
2014-12-160.460 ppm
2015-03-030.530 ppm
2015-03-030.440 ppm
2015-04-010.510 ppm
2015-04-010.520 ppm
2015-05-040.460 ppm
2015-05-040.450 ppm
2015-06-010.460 ppm
2015-06-010.470 ppm
2015-07-080.480 ppm
2015-07-080.490 ppm
2015-08-060.540 ppm
2015-08-060.560 ppm
2015-09-100.480 ppm
2015-09-100.460 ppm
2015-10-060.450 ppm
2015-10-060.470 ppm
2015-11-100.520 ppm
2015-11-100.430 ppm
2016-01-120.520 ppm
2016-01-120.550 ppm
2016-02-040.450 ppm
2016-02-040.440 ppm
2016-03-100.480 ppm
2016-03-100.440 ppm
2016-06-030.420 ppm
2016-06-030.420 ppm
2016-11-180.420 ppm
2016-11-180.430 ppm
2016-12-300.340 ppm
2016-12-300.330 ppm
2017-01-200.360 ppm
2017-01-200.360 ppm
2017-02-200.510 ppm
2017-02-200.510 ppm
2017-03-230.380 ppm
2017-03-230.380 ppm
2017-04-210.380 ppm
2017-04-210.410 ppm
2017-05-24ND
2017-05-240.430 ppm
2017-05-260.380 ppm
2017-05-260.380 ppm
2017-06-260.450 ppm
2017-06-260.450 ppm
2017-06-260.450 ppm
2017-07-210.380 ppm
2017-07-210.380 ppm
2017-07-210.380 ppm
2017-07-210.380 ppm
2017-08-250.380 ppm
2017-08-250.380 ppm
2017-09-150.350 ppm
2017-09-150.350 ppm
2017-11-280.370 ppm
2017-11-280.400 ppm
2017-11-280.400 ppm
2017-12-070.420 ppm
2017-12-070.420 ppm