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EWG's Tap Water Database — 2019 UPDATE

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Selenium

Water District 1 of Johnson County

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
20121.10 ppb63ND - 2.60 ppb
20131.000 ppb73ND - 2.60 ppb
20141.77 ppb331.50 ppb - 2.10 ppb
20152.07 ppb332.00 ppb - 2.10 ppb
20162.30 ppb331.70 ppb - 2.90 ppb
20172.33 ppb331.80 ppb - 2.60 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
2012-03-06576121WS2.60 ppb
2012-03-06576120WS1.40 ppb
2012-05-22MAY2012-IOC-TP2ND
2012-05-22MAY2012-IOC-TP3ND
2012-05-29579491WS2.60 ppb
2012-05-30MAY2012-IOC-TP1ND
2013-03-05592968WS2.60 ppb
2013-03-05592969WS1.90 ppb
2013-05-01MAY2013-IOC-TP3ND
2013-05-01MAY2013-IOC-TP2ND
2013-05-01MAY2013-IOC-TP1ND
2013-05-14596073WS2.50 ppb
2013-07-08JUL2013-IOC-TP1ND
2014-03-04702602.10 ppb
2014-03-04702471.70 ppb
2014-05-131134331.50 ppb
2015-05-043225862.10 ppb
2015-05-043225852.10 ppb
2015-05-043225842.00 ppb
2016-05-175480232.90 ppb
2016-05-175480222.30 ppb
2016-06-205667341.70 ppb
2017-02-147085522.60 ppb
2017-02-147085512.60 ppb
2017-02-147085501.80 ppb