Selenium

City of Brandon

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.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	N/A	0	N/A
2015	N/A	0	N/A
2016	ND	9	ND
2017	N/A	0	N/A
2018	N/A	0	N/A
2019	ND	11	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
2016-12-13	161214-121IN	ND
2016-12-13	161214-120IN	ND
2016-12-13	161214-119IN	ND
2016-12-13	161214-118IN	ND
2016-12-13	161214-117IN	ND
2016-12-13	161214-116IN	ND
2016-12-13	161214-115IN	ND
2016-12-13	161214-114IN	ND
2016-12-13	161214-112IN	ND
2019-03-28	190329-008IN	ND
2019-03-28	190329-007IN	ND
2019-03-28	190329-006IN	ND
2019-03-28	190329-005IN	ND
2019-03-28	190329-004IN	ND
2019-03-28	190329-003IN	ND
2019-03-28	190329-002IN	ND
2019-03-28	190329-001IN	ND
2019-04-02	190403-005IN	ND
2019-07-09	190710-002IN	ND
2019-11-13	191114-005IN	ND