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EWG's Tap Water Database — 2019 UPDATE

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Selenium

City of Kerrville

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
2012ND10ND
2013ND10ND
2014ND10ND
2015ND10ND
2016ND60ND
20172.29 ppb82ND - 10.00 ppb

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
2012-10-041210228003ND
2013-07-29AC25998ND
2014-02-10AC41871ND
2015-01-28AC78082ND
2016-02-01AD20978ND
2016-02-01AD20973ND
2016-04-18AD33309ND
2016-07-05AD42869ND
2016-10-24AD54249ND
2016-10-24AD54250ND
2017-02-13AD70299ND
2017-04-06AD78702ND
2017-05-08AD82958ND
2017-05-08AD82960ND
2017-05-08AD82959ND
2017-05-09AD832568.30 ppb
2017-05-09AD83251ND
2017-05-09AD8325510.00 ppb