EWG's Tap Water Database — 2021 UPDATE



Paragould Light Water & Cable

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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20140.685 ppm13130.620 ppm - 0.830 ppm
20150.777 ppm12120.590 ppm - 0.900 ppm
20160.818 ppm12120.770 ppm - 0.900 ppm
20170.871 ppm13130.810 ppm - 0.940 ppm
20180.838 ppm12120.770 ppm - 0.880 ppm
20190.828 ppm13130.740 ppm - 0.920 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
2014-01-071401600200.660 ppm
2014-02-051404900110.660 ppm
2014-03-101407600340.690 ppm
2014-03-241409000300.650 ppm
2014-04-151410700040.620 ppm
2014-05-081413900170.680 ppm
2014-06-031416700030.660 ppm
2014-07-081420200160.660 ppm
2014-07-291421600100.680 ppm
2014-09-081426500030.750 ppm
2014-10-08Y1428900510.830 ppm
2014-11-05Y1432100230.680 ppm
2014-12-03Y1434900200.690 ppm
2015-01-05Y1501300590.820 ppm
2015-02-09Y1505100060.800 ppm
2015-02-26Y1506900100.590 ppm
2015-04-06Y1511100200.650 ppm
2015-05-13Y1513400510.720 ppm
2015-06-11Y1517400050.850 ppm
2015-07-07Y1520800150.690 ppm
2015-08-24Y1524300250.820 ppm
2015-09-14Y1526500190.860 ppm
2015-10-14Y1529900060.900 ppm
2015-11-04Y1532000030.860 ppm
2015-12-07Y1535200090.760 ppm
2016-01-04Y1601200040.800 ppm
2016-02-10Y1605300240.800 ppm
2016-03-09Y1608100240.780 ppm
2016-04-04Y1610400300.840 ppm
2016-05-12Y1614400320.860 ppm
2016-06-07Y1617900340.900 ppm
2016-07-06Y1620000340.820 ppm
2016-08-24Y1625100120.780 ppm
2016-09-07Y1626400170.770 ppm
2016-10-04Y1628800960.800 ppm
2016-11-07Y1632100290.840 ppm
2016-12-13Y1636200040.830 ppm
2017-01-05Y1701200560.820 ppm
2017-02-06Y1704400030.870 ppm
2017-03-07Y1707900310.860 ppm
2017-03-29Y1710000410.900 ppm
2017-04-28Y1712800070.830 ppm
2017-05-10Y1713000010.810 ppm
2017-06-06Y1717000010.870 ppm
2017-07-06Y1719800250.920 ppm
2017-07-31Y1722600140.840 ppm
2017-09-06Y1726100100.940 ppm
2017-10-05Y1728900280.890 ppm
2017-11-01Y1731700510.920 ppm
2017-11-28Y1734500660.850 ppm
2018-01-03Y1801800040.810 ppm
2018-02-06Y1805200080.770 ppm
2018-03-02Y1806600440.850 ppm
2018-04-03Y1809900380.880 ppm
2018-05-04Y1813000510.860 ppm
2018-06-05Y1816200240.860 ppm
2018-07-03Y1819700340.830 ppm
2018-08-02Y1821900310.840 ppm
2018-09-07Y1826100220.820 ppm
2018-10-02Y1828900170.870 ppm
2018-11-02Y1831700140.830 ppm
2018-11-30Y1834400010.830 ppm
2019-01-03Y1901400130.820 ppm
2019-02-05Y1905000070.740 ppm
2019-03-06Y1907700090.820 ppm
2019-03-29Y1909800430.760 ppm
2019-04-26Y1912600010.780 ppm
2019-05-31Y1916100080.880 ppm
2019-06-27Y1918900080.920 ppm
2019-07-31Y1922500610.870 ppm
2019-08-30Y1925400010.860 ppm
2019-10-07Y1928800540.830 ppm
2019-10-29Y1931000080.800 ppm
2019-12-05Y1934700550.820 ppm
2019-12-31Y2000600160.870 ppm