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EWG's Tap Water Database — 2021 UPDATE

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Selenium

Lee County WSC

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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015ND20ND
2016ND50ND
20170.860 ppb51ND - 4.30 ppb
2018ND20ND
2019ND50ND

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
2015-03-04AC82817ND
2015-03-04AC82818ND
2016-01-27AD20303ND
2016-01-27AD20304ND
2016-01-27AD20302ND
2016-04-12AD32724ND
2016-04-12AD32718ND
2017-01-30AD67458ND
2017-01-30AD67457ND
2017-05-04AD82652ND
2017-05-04AD82645ND
2017-07-24AD902564.30 ppb
2018-05-03AE24965ND
2018-07-10AE32746ND
2019-01-15AE49756ND
2019-01-15AE49753ND
2019-01-15AE49752ND
2019-01-15AE49754ND
2019-07-26AE76063ND