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EWG's Tap Water Database — 2019 UPDATE

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Selenium

City of Lewiston

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.

 

31

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
20130.457 ppb61ND - 2.74 ppb
20140.990 ppb63ND - 2.31 ppb
2015ND60ND
2016ND40ND
2017ND50ND

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
2012-04-03I59255ND
2012-08-15I62176ND
2012-08-15I62177ND
2012-08-15I62178ND
2013-02-27I130228026-001ND
2013-06-05I130606050-0012.74 ppb
2013-06-05I130606050-002ND
2013-08-21I130822058-001ND
2013-08-21I130822058-005ND
2013-08-21I130822058-004ND
2014-02-25I140226039-001ND
2014-02-25I140226039-0022.14 ppb
2014-06-03I140604041-0021.49 ppb
2014-06-03I140604041-0012.31 ppb
2014-08-13I140814054-005ND
2014-08-13I140814054-004ND
2015-01-21I150122025-001ND
2015-04-21I150422037-001ND
2015-06-10I150611032-002ND
2015-06-10I150611032-001ND
2015-07-22I150723044-001ND
2015-07-22I150723044-003ND
2016-02-09I160209050-002ND
2016-02-09I160209050-001ND
2016-04-06I160407008-001ND
2016-04-06I160407008-003ND
2017-03-28I170328050-001ND
2017-03-28I170328050-002ND
2017-10-25I171026026-003ND
2017-10-25I171026026-002ND
2017-10-25I171026026-001ND