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EWG's Tap Water Database — 2021 UPDATE

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Mercury (inorganic)

Cal-am Water Company - Duarte

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.

MORE ABOUT THIS CONTAMINANT

 

51

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND80ND
2015ND70ND
2016ND200ND
2017N/A00N/A
2018N/A00N/A
2019ND160ND

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
2014-06-231225-002-1300ND
2014-06-231225-019-1005ND
2014-06-231225-010-1330ND
2014-06-231225-009-1135ND
2014-06-231225-008-1235ND
2014-06-231225-003-1110ND
2014-06-231225-007-1240ND
2014-12-039588-019-1020ND
2015-09-281225-003-1050ND
2015-09-281225-007-1200ND
2015-09-281225-010-0945ND
2015-09-281225-009-1345ND
2015-09-281225-008-1330ND
2015-10-141225-019-0945ND
2015-10-141225-002-1205ND
2016-06-201225-019-1115ND
2016-06-201225-010-1135ND
2016-06-201225-008-1145ND
2016-07-201225-009-1030ND
2016-07-201225-002-1110ND
2016-07-201225-003-1000ND
2016-07-201225-007-0930ND
2016-08-109590-008-1030ND
2016-08-109590-019-1125ND
2016-08-109590-010-1015ND
2016-08-109590-007-1045ND
2016-08-119590-002-1105ND
2016-08-119590-003-1205ND
2016-08-119590-009-1150ND
2016-09-079588-009-1400ND
2016-09-079588-002-1330ND
2016-09-079588-007-1245ND
2016-09-079588-008-1345ND
2016-09-079588-010-1315ND
2016-09-079588-003-1305ND
2019-02-069590-022-1230ND
2019-07-109590-008-1240ND
2019-07-109590-002-1310ND
2019-07-109590-022-1339ND
2019-07-109590-019-0930ND
2019-07-109590-003-1135ND
2019-07-109590-010-1335ND
2019-07-109590-007-1040ND
2019-07-109590-009-1210ND
2019-08-079588-019-1400ND
2019-08-079588-003-1400ND
2019-08-079588-010-1400ND
2019-08-079588-008-1400ND
2019-08-079588-002-1400ND
2019-08-079588-009-1400ND
2019-08-079588-007-1400ND