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EWG's Tap Water Database — 2021 UPDATE

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Selenium

Placer County Water Agency - Foothill

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.

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND20ND
2015ND20ND
2016ND40ND
2017ND40ND
2018ND30ND
2019ND30ND

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
2014-08-203334-007-1200ND
2014-08-203334-002-1010ND
2015-08-113334-002-1000ND
2015-08-113334-007-1305ND
2016-03-302113-014-1440ND
2016-08-032113-014-1045ND
2016-08-172113-002-1215ND
2016-08-172113-007-0945ND
2017-08-081233-007-0900ND
2017-08-081233-002-1120ND
2017-08-221233-014-1040ND
2017-08-227473-014-1040ND
2018-08-147473-007-1310ND
2018-08-147473-002-1120ND
2018-08-227473-014-0930ND
2019-08-277473-002-1135ND
2019-09-097473-007-1330ND
2019-09-127473-014-1150ND