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EWG's Tap Water Database — 2019 UPDATE

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Mercury (inorganic)

San Gabriel County WD

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
2012ND20ND
2013ND10ND
2014ND40ND
2015ND10ND
2016ND10ND
2017ND30ND

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
2012-07-179588-007-0945ND
2012-07-179588-009-0915ND
2013-05-243761-020-1125ND
2014-06-173761-020-1020ND
2014-07-149588-011-0945ND
2014-09-259588-001-0915ND
2014-10-089588-010-0920ND
2015-07-169588-007-0920ND
2016-07-189588-009-0925ND
2017-04-139588-020-0940ND
2017-07-179588-011-0945ND
2017-10-189588-010-0910ND