EWG's Tap Water Database — 2019 UPDATE



Smyrna Water Department

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
20120.891 ppm40400.560 ppm - 1.44 ppm
20130.887 ppm38380.470 ppm - 1.82 ppm
20140.900 ppm29290.490 ppm - 1.13 ppm
20150.846 ppm36360.190 ppm - 1.17 ppm
20160.878 ppm38380.180 ppm - 1.62 ppm
20170.866 ppm40400.240 ppm - 1.54 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
2012-01-17S3134130.760 ppm
2012-01-26S3629830.710 ppm
2012-01-26S3629840.740 ppm
2012-01-26S3629850.740 ppm
2012-02-27S3629861.37 ppm
2012-02-27S3629871.44 ppm
2012-02-27S3629881.37 ppm
2012-03-28S3629891.09 ppm
2012-03-28S3629901.06 ppm
2012-03-28S3629911.05 ppm
2012-04-27S3629921.01 ppm
2012-04-27S3629931.01 ppm
2012-04-27S3629940.990 ppm
2012-05-25S3630250.850 ppm
2012-05-25S3630260.870 ppm
2012-05-25S3630271.26 ppm
2012-06-26S3630280.910 ppm
2012-06-26S3630291.000 ppm
2012-06-26S3630300.710 ppm
2012-07-25S3630310.940 ppm
2012-07-25S3630321.08 ppm
2012-07-25S3630330.730 ppm
2012-08-27S3630340.620 ppm
2012-08-27S3630350.560 ppm
2012-08-27S3630360.880 ppm
2012-09-27S3630370.650 ppm
2012-09-27S3630380.580 ppm
2012-09-27S3630390.650 ppm
2012-10-31S4022210.720 ppm
2012-10-31S4022220.720 ppm
2012-10-31S4022230.730 ppm
2012-11-28S4022240.750 ppm
2012-11-28S4022251.05 ppm
2012-11-28S4022260.760 ppm
2012-12-26S4022270.730 ppm
2012-12-26S4022280.870 ppm
2012-12-26S4022290.920 ppm
2012-12-27S4585971.08 ppm
2012-12-27S4585980.780 ppm
2012-12-27S4585990.900 ppm
2013-01-29S4022300.930 ppm
2013-01-29S4022310.940 ppm
2013-01-29S4022320.950 ppm
2013-02-26S4022330.690 ppm
2013-02-26S4022340.690 ppm
2013-02-26S4022350.970 ppm
2013-03-26S4022061.22 ppm
2013-03-26S4022071.22 ppm
2013-03-26S4022080.900 ppm
2013-04-25S4022091.03 ppm
2013-04-25S4022100.760 ppm
2013-04-25S4022110.880 ppm
2013-05-24S4022120.830 ppm
2013-05-24S4022130.470 ppm
2013-05-24S4022140.910 ppm
2013-06-25S4022150.620 ppm
2013-06-25S4022160.540 ppm
2013-06-25S4022170.790 ppm
2013-07-26S4021910.890 ppm
2013-07-26S4022180.570 ppm
2013-07-26S4022190.790 ppm
2013-08-27S4021920.700 ppm
2013-08-27S4021930.940 ppm
2013-08-27S4021941.21 ppm
2013-09-27S4021950.600 ppm
2013-09-27S4021960.610 ppm
2013-09-27S4021970.620 ppm
2013-10-29S4021980.740 ppm
2013-10-29S4021991.82 ppm
2013-10-29S4022001.27 ppm
2013-11-20S5050450.970 ppm
2013-11-20S5050460.890 ppm
2013-11-20S5050470.950 ppm
2013-11-26S4022010.920 ppm
2013-11-26S4022020.780 ppm
2013-11-26S4022030.990 ppm
2013-12-30S4022041.05 ppm
2013-12-30S4022051.05 ppm
2014-01-30S4021761.13 ppm
2014-01-30S4021771.12 ppm
2014-02-28S4021780.870 ppm
2014-02-28S4021790.870 ppm
2014-03-24S5072760.590 ppm
2014-03-24S5072770.720 ppm
2014-03-24S5072780.490 ppm
2014-03-27S4021800.890 ppm
2014-03-27S4021810.890 ppm
2014-03-27S4021820.890 ppm
2014-04-28S4021830.830 ppm
2014-04-28S4021840.920 ppm
2014-04-28S4021850.910 ppm
2014-05-28S4021860.870 ppm
2014-05-28S4021870.870 ppm
2014-05-28S4021880.900 ppm
2014-06-25S4021890.950 ppm
2014-06-25S4021900.950 ppm
2014-07-25S4030460.700 ppm
2014-07-25S4030470.950 ppm
2014-08-27S4030480.710 ppm
2014-08-27S4030490.970 ppm
2014-09-26S4030501.08 ppm
2014-09-26S4030511.08 ppm
2014-10-29S4030520.960 ppm
2014-10-29S4030530.960 ppm
2014-11-26S4030540.890 ppm
2014-12-22S4030561.07 ppm
2014-12-22S4030571.07 ppm
2015-01-29S4030581.10 ppm
2015-01-29S4030591.10 ppm
2015-02-26S4030600.980 ppm
2015-02-26S4032560.980 ppm
2015-03-27S4032570.990 ppm
2015-03-27S4032580.370 ppm
2015-03-27S4032590.370 ppm
2015-04-27S4032600.850 ppm
2015-04-27S4032610.550 ppm
2015-04-27S4032620.320 ppm
2015-05-26S4032630.990 ppm
2015-05-26S4032641.000 ppm
2015-06-29S4032650.950 ppm
2015-06-29S4032660.950 ppm
2015-06-29S4032671.17 ppm
2015-07-30S4032680.890 ppm
2015-07-30S4032690.890 ppm
2015-07-30S4032701.09 ppm
2015-08-26S4032860.390 ppm
2015-08-26S4032870.750 ppm
2015-08-26S4032881.02 ppm
2015-09-29S4032891.02 ppm
2015-09-29S4032900.990 ppm
2015-09-29S4032910.990 ppm
2015-10-26S4032920.820 ppm
2015-10-26S4032930.820 ppm
2015-10-26S4032940.830 ppm
2015-11-25S4032950.910 ppm
2015-11-25S4032960.920 ppm
2015-11-25S4032970.920 ppm
2015-12-17S6289590.190 ppm
2015-12-17S6289601.09 ppm
2015-12-17S6289610.370 ppm
2015-12-22S4032981.05 ppm
2015-12-22S4032990.770 ppm
2015-12-22S4033001.05 ppm
2016-01-28S6421660.760 ppm
2016-01-28S6421670.760 ppm
2016-01-28S6421680.760 ppm
2016-02-25S6421691.01 ppm
2016-02-25S6421700.650 ppm
2016-02-25S6421711.06 ppm
2016-03-30S6421720.820 ppm
2016-03-30S6421730.820 ppm
2016-03-30S6421740.920 ppm
2016-04-26S6421750.920 ppm
2016-04-26S6421760.950 ppm
2016-05-26S6421780.880 ppm
2016-05-26S6421790.890 ppm
2016-05-26S6421800.920 ppm
2016-06-29S6619620.970 ppm
2016-06-29S6619631.02 ppm
2016-06-29S6619641.02 ppm
2016-07-29S6619650.960 ppm
2016-07-29S6619660.970 ppm
2016-07-29S6619670.990 ppm
2016-08-30S6619680.910 ppm
2016-08-30S6619690.810 ppm
2016-08-30S6619700.390 ppm
2016-09-28S6619710.830 ppm
2016-09-28S6619720.780 ppm
2016-09-28S6619730.940 ppm
2016-10-11S7194910.180 ppm
2016-10-11S7194920.460 ppm
2016-10-11S7194930.980 ppm
2016-10-26S6619740.730 ppm
2016-10-26S6619751.47 ppm
2016-10-26S6619761.47 ppm
2016-11-29S6421510.680 ppm
2016-11-29S6421521.62 ppm
2016-11-29S6421530.680 ppm
2016-12-28S6421540.750 ppm
2016-12-28S6421550.810 ppm
2016-12-28S6421560.810 ppm
2017-01-27S6421570.720 ppm
2017-01-27S6421580.840 ppm
2017-01-27S6421590.800 ppm
2017-02-24S6421600.690 ppm
2017-02-24S6421610.680 ppm
2017-02-24S6421620.780 ppm
2017-03-28S6421630.740 ppm
2017-03-28S6421640.670 ppm
2017-03-28S6421650.740 ppm
2017-04-27S7324801.24 ppm
2017-04-27S7324811.26 ppm
2017-04-27S7324820.850 ppm
2017-05-31S7324830.660 ppm
2017-05-31S7324841.53 ppm
2017-05-31S7324851.54 ppm
2017-06-15S7379570.780 ppm
2017-06-15S7379580.240 ppm
2017-06-15S7379590.260 ppm
2017-06-28S7324861.49 ppm
2017-06-28S7324870.900 ppm
2017-06-28S7324880.910 ppm
2017-07-28S7324890.650 ppm
2017-07-28S7324901.42 ppm
2017-07-28S7324911.42 ppm
2017-08-29S7324920.810 ppm
2017-08-29S7324930.820 ppm
2017-08-29S7324940.820 ppm
2017-09-29S7324650.710 ppm
2017-09-29S7324660.710 ppm
2017-09-29S7324670.710 ppm
2017-10-27S7324680.570 ppm
2017-10-27S7324690.560 ppm
2017-10-27S7324700.570 ppm
2017-10-31S7790170.320 ppm
2017-11-29S7324710.760 ppm
2017-11-29S7324720.760 ppm
2017-11-29S7324730.730 ppm
2017-12-29S7324741.33 ppm
2017-12-29S7324751.33 ppm
2017-12-29S7324761.33 ppm