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EWG's Tap Water Database — 2019 UPDATE

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Selenium

Carson City Public Works

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.

 

38

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND100ND
2013ND50ND
2014ND40ND
2015ND70ND
2016ND30ND
2017ND90ND

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
2012-06-21201206220321-IND
2012-06-25201206270216-IND
2012-06-25201206270244-IND
2012-07-11201207130064-IND
2012-08-08201208100396-IND
2012-09-18201209200453-IND
2012-10-02201210030297-IND
2012-10-22201210230058-IND
2012-11-13201211150453-IND
2012-12-19201212200202ND
2013-06-18201306190582-IND
2013-06-26201306270194-IND
2013-07-18201307200001-IND
2013-09-09201309100461-IND
2013-09-25201309260254-IND
2014-05-27201405280593-IND
2014-07-01201407020365ND
2014-07-01201407020367ND
2014-07-01201407020366ND
2015-06-29201506300177-IOCND
2015-06-29201506300124-IOCND
2015-07-14201507150299ND
2015-07-15201507160255ND
2015-08-10201508110263ND
2015-09-15201509020134ND
2015-09-24201509250182ND
2016-06-22201606230265ND
2016-06-22201606230267ND
2016-08-10201608110453ND
2017-05-15201705160632ND
2017-05-15201705160571ND
2017-05-15201705160867ND
2017-05-16201705170491ND
2017-05-16201705170304ND
2017-05-16201705170782ND
2017-05-23201705240962ND
2017-05-25201705260591ND
2017-07-05201707060865ND