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EWG's Tap Water Database — 2021 UPDATE

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Mercury (inorganic)

Clayton County Water Authority

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND20ND
2015ND20ND
2016ND20ND
2017ND20ND
2018ND20ND
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
2014-02-10AI27803ND
2014-02-10AI27804ND
2015-02-17AI65010ND
2015-02-17AI65011ND
2016-01-19AJ04641ND
2016-01-19AJ04642ND
2017-01-18AJ39659ND
2017-01-18AJ39660ND
2018-01-23AJ77014ND
2018-01-23AJ77015ND
2019-01-09AK09143ND
2019-01-09AK09144ND