EWG's Tap Water Database — 2021 UPDATE



Waterford Township

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
20140.404 ppm12120.1000 ppm - 0.590 ppm
20150.400 ppm11ND - 0.710 ppm
20160.420 ppm11ND - 0.640 ppm
20170.440 ppm110.200 ppm - 0.670 ppm
20180.393 ppm12120.1000 ppm - 0.680 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
2014-03-05LLF109990.480 ppm
2014-03-05LLF110060.310 ppm
2014-03-05LLF110080.220 ppm
2014-03-05LLF110050.1000 ppm
2014-03-05LLF110070.280 ppm
2014-03-05LLF110010.480 ppm
2014-03-05LLF110040.590 ppm
2014-03-05LLF110020.570 ppm
2014-03-05LLF110030.500 ppm
2014-03-05LLF110000.550 ppm
2014-05-13LLF178120.350 ppm
2014-05-13LLF178130.420 ppm
2015-06-010.400 ppm*
2016-06-010.420 ppm*
2017-06-010.440 ppm*
2018-02-15LLH658420.310 ppm
2018-02-15LLH658410.560 ppm
2018-02-15LLH658400.500 ppm
2018-02-15LLH658390.400 ppm
2018-02-15LLH658450.320 ppm
2018-02-15LLH658440.240 ppm
2018-02-15LLH658430.680 ppm
2018-03-06LLH689710.1000 ppm
2018-03-06LLH689700.110 ppm
2018-03-06LLH689690.580 ppm
2018-03-06LLH689680.580 ppm
2018-05-16LLH808930.330 ppm
2019-03-14LLI292890.300 ppm
2019-03-14LLI292910.460 ppm
2019-03-14LLI292880.670 ppm
2019-03-14LLI292930.470 ppm
2019-03-14LLI292920.600 ppm
2019-03-14LLI292900.550 ppm
2019-03-14LLI292990.580 ppm
2019-03-14LLI292980.580 ppm
2019-03-14LLI292960.120 ppm
2019-03-14LLI292950.1000 ppm
2019-03-14LLI292940.430 ppm
2019-03-14LLI292970.230 ppm
2019-10-10LLI703560.230 ppm

* Sample result is taken from the system's CCR report.