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EWG's Tap Water Database — 2019 UPDATE

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Mercury (inorganic)

Centennial Water and Sanitation 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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0667 ppb31ND - 0.200 ppb
2013ND30ND
2014ND20ND
2015ND20ND
2016ND30ND
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 Result
2012-08-22ND
2012-08-230.200 ppb
2012-10-31ND
2013-03-19ND
2013-03-19ND
2013-08-27ND
2014-07-23ND
2014-07-29ND
2015-07-27ND
2015-08-12ND
2016-07-27ND
2016-07-27ND
2016-08-17ND
2017-01-25ND
2017-01-25ND
2017-08-15ND