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EWG's Tap Water Database — 2021 UPDATE

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Mercury (inorganic)

Dover Water Department

Mercury is a potent neurotoxin that also damages the kidneys and other internal organs. Mercury enters drinking water from industrial pollution, mining wastes and coal-fired power plants.

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND30ND
2015N/A00N/A
2016ND40ND
2017ND50ND
2018ND10ND
2019ND20ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 1.2 ppb

The EWG Health Guideline of 1.2 ppb for mercury (inorganic) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against harm to internal organs.

EPA Maximum Contaminant
Level (MCL) 2 ppb

The legal limit for inorganic mercury, established in 1991, was based on toxicity studies conducted in laboratory animals in the 1970s and 1980s. This limit does not include any additional consideration of children’s health.

ppb = parts per billion

All test results

Date Lab ID Result
2014-02-18A400694002ND
2014-07-14A404793003ND
2014-07-23A405333004ND
2016-07-06B605223003ND
2016-07-07B605299002ND
2016-10-05B609367001ND
2016-10-05B609367002ND
2017-06-01B703156002ND
2017-07-19B705657004ND
2017-07-20B705749002ND
2017-07-20B705749004ND
2017-07-20B705749006ND
2018-05-15B802449002ND
2019-08-27B907945001ND
2019-08-27B907945002ND