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EWG's Tap Water Database — 2019 UPDATE

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Mercury (inorganic)

Cross Valley Water District

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
2012ND110ND
2013ND50ND
2014ND10ND
2015N/A00N/A
2016N/A00N/A
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
2012-12-1149250ND
2012-12-1149253ND
2012-12-1149252ND
2012-12-1149251ND
2012-12-1149249ND
2012-12-1149248ND
2012-12-1149247ND
2012-12-1149246ND
2012-12-1149245ND
2012-12-1149244ND
2012-12-1149243ND
2013-12-1053122ND
2013-12-1053121ND
2013-12-1053120ND
2013-12-1053119ND
2013-12-1053123ND
2014-10-1446279ND