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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

Rowland Water District

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.

 

67

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.839 ppm12120.480 ppm - 0.990 ppm
20130.830 ppm11110.530 ppm - 0.960 ppm
20140.830 ppm10100.690 ppm - 0.900 ppm
20150.825 ppm12120.720 ppm - 0.890 ppm
20160.747 ppm11110.480 ppm - 0.870 ppm
20170.745 ppm11110.690 ppm - 0.840 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
2012-01-173761-003-08320.990 ppm
2012-02-213761-003-08500.930 ppm
2012-03-193761-003-08130.920 ppm
2012-04-163761-003-08200.830 ppm
2012-05-213761-003-09440.830 ppm
2012-06-183761-003-08270.980 ppm
2012-07-163761-003-10000.830 ppm
2012-08-203761-003-08490.730 ppm
2012-09-173761-003-08310.790 ppm
2012-10-153761-003-09170.840 ppm
2012-11-193761-003-08000.480 ppm
2012-12-173761-003-08450.920 ppm
2013-01-223761-003-09300.870 ppm
2013-03-183761-003-09200.860 ppm
2013-04-153761-003-08300.920 ppm
2013-05-203761-003-09150.910 ppm
2013-06-173761-003-08390.870 ppm
2013-07-153761-003-08070.530 ppm
2013-08-193761-003-09030.960 ppm
2013-09-163761-003-09050.960 ppm
2013-10-213761-003-09420.750 ppm
2013-11-183761-003-08300.780 ppm
2013-12-163761-003-08300.720 ppm
2014-01-213761-003-10400.810 ppm
2014-02-183761-003-09150.870 ppm
2014-04-213761-003-08400.870 ppm
2014-05-193761-003-09250.690 ppm
2014-06-163761-003-08150.770 ppm
2014-07-213761-003-08350.850 ppm
2014-08-183761-003-08350.860 ppm
2014-09-153761-003-09200.900 ppm
2014-11-243761-003-09500.870 ppm
2014-12-153761-003-09300.810 ppm
2015-01-203761-003-10150.870 ppm
2015-02-173761-003-09300.890 ppm
2015-03-163761-003-07500.840 ppm
2015-04-203761-003-08000.840 ppm
2015-05-183761-003-08150.840 ppm
2015-06-153761-003-08000.720 ppm
2015-07-223761-003-09050.780 ppm
2015-08-173761-003-08400.800 ppm
2015-09-213761-003-08450.830 ppm
2015-10-193761-003-10450.820 ppm
2015-11-173761-003-09150.830 ppm
2015-12-213761-003-07500.840 ppm
2016-01-193761-003-08000.750 ppm
2016-02-163761-003-09200.790 ppm
2016-03-213761-003-07550.480 ppm
2016-04-183761-003-09000.780 ppm
2016-06-203761-003-11200.810 ppm
2016-07-183761-003-08550.730 ppm
2016-08-153761-003-08000.870 ppm
2016-09-193761-003-10000.770 ppm
2016-10-173761-003-08000.750 ppm
2016-11-213761-003-08300.790 ppm
2016-12-193761-003-11450.700 ppm
2017-01-173761-003-07500.740 ppm
2017-02-213761-003-08000.710 ppm
2017-03-203761-003-10150.690 ppm
2017-05-153761-003-07400.740 ppm
2017-06-193761-003-08300.700 ppm
2017-07-173761-003-10000.730 ppm
2017-08-213761-003-07300.750 ppm
2017-09-183761-003-09400.790 ppm
2017-10-163761-003-09300.690 ppm
2017-11-203761-003-08400.840 ppm
2017-12-183761-003-09300.810 ppm