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EWG's Tap Water Database — 2019 UPDATE

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Mercury (inorganic)

North Penn 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.

 

26

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND120ND
2013N/A00N/A
2014N/A00N/A
2015ND130ND
2016ND10ND
2017N/A00N/A

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
2012-05-0712050555ND
2012-05-0712050555ND
2012-05-0712050555ND
2012-05-0712050555ND
2012-05-0712050555ND
2012-05-1412051179ND
2012-05-1412051179ND
2012-05-1412051179ND
2012-05-1412051179ND
2012-05-1412051179ND
2012-05-1412051179ND
2012-07-2312072182ND
2015-01-1912287654ND
2015-01-1912287643ND
2015-01-1912287621ND
2015-01-1912287632ND
2015-02-0912401683ND
2015-02-0912401672ND
2015-02-0912401661ND
2015-03-0912515590ND
2015-03-0912515601ND
2015-04-2012633593ND
2015-05-1912750088ND
2015-05-1912750089ND
2015-12-0913633907ND
2016-08-2314907940ND