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EWG's Tap Water Database — 2019 UPDATE

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Selenium

Cedar Rapids Water Department

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
2013ND20ND
2014ND20ND
2015ND20ND
2016ND20ND
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
2012-05-091902640ND
2012-05-091902641ND
2012-10-311943782ND
2012-10-311943784ND
2013-09-102005703ND
2013-09-102005705ND
2014-10-082085412ND
2014-10-082085409ND
2015-10-06OE302401ND
2015-10-06OE302405ND
2016-10-17OE441633ND
2016-10-17OE441634ND
2017-11-20OE592397ND
2017-11-20OE592396ND