Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Selenium

Del-Co Water Company Inc.

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.

 

25

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

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

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
2012-01-0912-10325-01ND
2012-01-0912-10322-01AND
2012-01-0912-10323-01AND
2012-06-0512-16249-03ND
2013-01-0813-10284-01ND
2013-01-0813-10283-01AND
2013-01-0813-10282-01AND
2013-06-1013-17185-01AND
2014-01-0714-10165-01AND
2014-01-0714-10164-03AND
2014-01-0714-10161-03AND
2014-05-0714-15406-01AND
2014-06-3014-18397-01AND
2015-01-0515-10022-01AND
2015-01-0515-10021-01AND
2015-01-0515-10020-01ND
2015-06-0815-17517-01AND
2016-01-0416-10029-01AND
2016-01-0416-10028-01AND
2016-01-0416-10027-01ND
2016-06-0116-17762-01AND
2017-01-0317-10012-01ND
2017-01-0317-10011-01ND
2017-01-0317-10009-01AND
2017-06-1917-20888-01AND