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EWG's Tap Water Database — 2019 UPDATE

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Mercury (inorganic)

Monterey Park 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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
2013ND50ND
2014ND10ND
2015ND20ND
2016ND40ND
2017ND10ND

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
2012-08-149588-038-0935ND
2012-10-313761-006-1345ND
2012-11-059588-006-0940ND
2012-11-083761-038-0810ND
2013-02-059588-013-1020ND
2013-02-059588-010-1035ND
2013-03-283761-013-0915ND
2013-08-209588-001-0920ND
2013-11-199588-011-1120ND
2014-08-219588-002-0945ND
2015-08-259588-038-1035ND
2015-11-109588-006-1100ND
2016-02-189588-013-1045ND
2016-02-189588-010-1030ND
2016-08-119588-001-0905ND
2016-08-119588-011-0930ND
2017-08-159588-002-0915ND