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EWG's Tap Water Database — 2019 UPDATE

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Selenium

Las Virgenes Municipal Water District

Selenium is an essential element in diets. But too much selenium can decrease thyroid hormone production and cause hair loss, skin lesions and brittle fingernails.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
2013ND30ND
2014ND30ND
2015ND10ND
2016ND20ND
2017ND30ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 30 ppb

The EWG Health Guideline of 30 ppb for selenium 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 hair loss and nail damage.

EPA Maximum Contaminant
Level (MCL) 50 ppb

The legal limit for selenium, established in 1991, was based on human epidemiological studies of populations exposed to naturally occurring selenium in drinking water. This limit does not include any additional consideration of children’s health.

ppb = parts per billion

All test results

Date Lab ID Result
2012-02-149590-004-1205ND
2012-05-229590-004-1045ND
2012-08-149590-004-1135ND
2012-11-069590-004-1255ND
2013-02-269590-004-1040ND
2013-08-159588-004-1205ND
2013-11-199588-004-1015ND
2014-02-199588-004-1100ND
2014-05-139588-004-1140ND
2014-11-189588-004-1025ND
2015-02-189588-004-1005ND
2016-02-179588-004-0942ND
2016-08-169588-004-1045ND
2017-02-229588-004-0932ND
2017-05-169588-004-1130ND
2017-08-239588-004-1007ND