Selenium

Lebanon

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.

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Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2013	N/A	0	N/A
2014	N/A	0	N/A
2015	N/A	0	N/A
2016	ND	13	ND
2017	ND	4	ND
2018	ND	1	ND
2019	ND	6	ND

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
2016-02-29	AC66565	ND
2016-02-29	AC66564	ND
2016-02-29	AC66569	ND
2016-02-29	AC66568	ND
2016-02-29	AC66566	ND
2016-02-29	AC66563	ND
2016-02-29	AC66567	ND
2016-03-25	AC69033	ND
2016-03-25	AC69046	ND
2016-04-04	AC70292	ND
2016-04-04	AC70293	ND
2016-08-02	AC80038	ND
2016-10-12	AC85441	ND
2017-01-30	AC89314	ND
2017-04-17	AC94652	ND
2017-07-18	AD01718	ND
2017-10-24	AD08055	ND
2018-05-08	AD18222	ND
2019-03-04	AD39580	ND
2019-03-04	AD39581	ND
2019-03-04	AD39582	ND
2019-03-04	AD39583	ND
2019-03-04	AD39584	ND
2019-03-04	AD39585	ND