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EWG's Tap Water Database — 2019 UPDATE

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Selenium

City of Manteca

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.

 

30

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND80ND
2013ND50ND
2014ND20ND
2015ND90ND
2016ND40ND
2017ND20ND

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
2012-02-085810-044-0745ND
2012-05-085810-028-0810ND
2012-05-085810-016-1115ND
2012-05-085810-013-0710ND
2012-06-125810-049-0717ND
2012-08-145810-015-0920ND
2012-09-115810-030-0927ND
2012-12-115810-036-1125ND
2013-04-105810-012-0805ND
2013-05-155810-034-0746ND
2013-06-055810-038-0745ND
2013-07-175810-032-0730ND
2013-08-145810-014-0810ND
2014-04-085810-040-0825ND
2014-06-105810-042-0750ND
2015-02-105810-044-0644ND
2015-05-125810-013-0750ND
2015-05-125810-028-1535ND
2015-05-125810-016-0725ND
2015-06-095810-049-0650ND
2015-07-215810-034-0812ND
2015-08-115810-015-0815ND
2015-09-085810-030-1045ND
2015-12-095810-036-0840ND
2016-04-195810-012-0920ND
2016-06-145810-038-0645ND
2016-07-125810-032-0630ND
2016-08-235810-014-0715ND
2017-05-095810-040-0859ND
2017-06-135810-042-0745ND