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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

Carson City Public Works

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.

 

169

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.47 ppm8684ND - 2.70 ppm
20130.397 ppm76ND - 1.30 ppm
20140.537 ppm2624ND - 2.80 ppm
20150.572 ppm1411ND - 1.60 ppm
20160.760 ppm76ND - 1.50 ppm
20170.667 ppm2927ND - 1.70 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
2012-06-19201206210314-IND
2012-06-21201206220321-I0.440 ppm
2012-06-25201206270216-I0.0660 ppm
2012-07-101202841.57 ppm
2012-07-101202851.62 ppm
2012-07-101202861.59 ppm
2012-07-111202871.59 ppm
2012-07-111202891.56 ppm
2012-07-111202971.55 ppm
2012-07-111202981.64 ppm
2012-07-11201207130064-IND
2012-07-121202991.55 ppm
2012-07-121203011.68 ppm
2012-07-121203021.52 ppm
2012-07-131203060.550 ppm
2012-07-141203051.24 ppm
2012-07-151203041.51 ppm
2012-07-161203031.52 ppm
2012-07-171203071.53 ppm
2012-07-181203081.51 ppm
2012-07-201203171.55 ppm
2012-07-211203181.55 ppm
2012-07-221203191.55 ppm
2012-07-241203201.52 ppm
2012-07-251203281.50 ppm
2012-07-261203391.55 ppm
2012-07-271203431.53 ppm
2012-07-281203441.52 ppm
2012-07-291203451.61 ppm
2012-07-301203461.51 ppm
2012-07-311203511.56 ppm
2012-08-011203541.56 ppm
2012-08-01201208020264-I0.180 ppm
2012-08-021203641.54 ppm
2012-08-031203661.63 ppm
2012-08-041203671.54 ppm
2012-08-051203681.55 ppm
2012-08-071203731.73 ppm
2012-08-081203801.73 ppm
2012-08-08201208100396-I0.770 ppm
2012-08-091203811.71 ppm
2012-08-101203821.72 ppm
2012-08-111203831.71 ppm
2012-08-121203841.68 ppm
2012-08-141203861.70 ppm
2012-08-151203911.72 ppm
2012-08-161203961.74 ppm
2012-08-171203971.74 ppm
2012-08-181203981.71 ppm
2012-08-191203991.70 ppm
2012-08-201204001.68 ppm
2012-08-211204011.69 ppm
2012-08-221204031.66 ppm
2012-08-231204081.51 ppm
2012-08-251204141.59 ppm
2012-08-281204151.51 ppm
2012-08-291204231.78 ppm
2012-08-301204251.77 ppm
2012-08-311204301.70 ppm
2012-09-011204311.72 ppm
2012-09-021204321.73 ppm
2012-09-051204431.74 ppm
2012-09-061204511.74 ppm
2012-09-071204531.52 ppm
2012-09-081204541.76 ppm
2012-09-091204551.76 ppm
2012-09-111204591.78 ppm
2012-09-121204671.77 ppm
2012-09-131204791.69 ppm
2012-09-141204801.70 ppm
2012-09-151204811.70 ppm
2012-09-161204821.49 ppm
2012-09-181204851.68 ppm
2012-09-18201209200453-I0.140 ppm
2012-09-191204891.69 ppm
2012-09-201204971.68 ppm
2012-09-231205011.67 ppm
2012-09-251205081.62 ppm
2012-09-261205161.66 ppm
2012-09-271205201.64 ppm
2012-09-291205221.64 ppm
2012-09-301205231.52 ppm
2012-10-02201210030297-I0.430 ppm
2012-10-22201210230058-I0.170 ppm
2012-11-13201211150453-I0.520 ppm
2012-12-192012122002022.70 ppm
2013-06-18201306190582-I0.0520 ppm
2013-06-26201306270194-IND
2013-07-18201307200001-I0.280 ppm
2013-07-23S201307-10370.200 ppm
2013-07-232013072407250.340 ppm
2013-09-09201309100461-I1.30 ppm
2013-09-25201309260254-I0.610 ppm
2014-05-27201405280593-NND
2014-06-192014062001950.0730 ppm
2014-06-192014062001190.380 ppm
2014-06-192014062001201.10 ppm
2014-06-192014062001960.0610 ppm
2014-06-192014062001211.40 ppm
2014-06-192014062001941.20 ppm
2014-06-242014062500840.240 ppm
2014-06-242014062500830.110 ppm
2014-06-242014062500860.260 ppm
2014-06-242014062500870.150 ppm
2014-06-242014062500880.170 ppm
2014-06-242014062500850.0610 ppm
2014-06-252014062602690.0520 ppm
2014-06-25201406260270ND
2014-06-252014062602680.0540 ppm
2014-06-252014062602670.310 ppm
2014-07-012014070203660.0550 ppm
2014-07-012014070203670.0580 ppm
2014-07-012014070203651.40 ppm
2014-07-082014070907170.0540 ppm
2014-07-302014073102630.0600 ppm
2014-09-041409107-0031.40 ppm
2014-09-042014090502611.60 ppm
2014-09-041409107-0020.920 ppm
2014-09-041409107-0012.80 ppm
2015-05-06150506-0081.60 ppm
2015-06-031506119-0011.30 ppm
2015-06-29201506300124-IOC1.10 ppm
2015-06-29201506300177-IOC0.510 ppm
2015-06-30201507010220-IOC0.740 ppm
2015-07-011507048-0011.60 ppm
2015-07-14201507150299ND
2015-07-15201507160598ND
2015-07-152015071604410.0520 ppm
2015-07-152015071602550.440 ppm
2015-08-042015080503270.190 ppm
2015-08-102015081102630.140 ppm
2015-09-152015090201340.330 ppm
2015-09-24201509250182ND
2016-06-22201606230265ND
2016-06-222016062302670.330 ppm
2016-06-222016062302700.330 ppm
2016-06-271606830-0011.50 ppm
2016-07-18160718-0011.50 ppm
2016-08-102016081103500.360 ppm
2016-08-102016081104531.30 ppm
2017-05-152017051608670.0760 ppm
2017-05-152017051605710.220 ppm
2017-05-152017051606320.0720 ppm
2017-05-162017051704911.20 ppm
2017-05-162017051703041.30 ppm
2017-05-232017052409620.180 ppm
2017-05-252017052605910.160 ppm
2017-06-06170606-0221.50 ppm
2017-06-202017062105370.0680 ppm
2017-06-202017062107250.0640 ppm
2017-07-051707051-0021.50 ppm
2017-07-052017070608650.0720 ppm
2017-07-192017072008141.30 ppm
2017-07-202017072103310.110 ppm
2017-07-202017072103280.190 ppm
2017-07-25201707260765ND
2017-07-252017072606540.310 ppm
2017-07-25201707260764ND
2017-07-262017072604900.0540 ppm
2017-07-272017072803131.60 ppm
2017-08-012017080208970.0660 ppm
2017-08-012017080209220.320 ppm
2017-08-012017080214360.600 ppm
2017-08-02170802-0011.40 ppm
2017-08-282017082902170.390 ppm
2017-09-06170906_0071.70 ppm
2017-10-04171004-0011.50 ppm
2017-11-011711043-0011.70 ppm
2017-12-061712200-0011.70 ppm