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EWG's Tap Water Database — 2019 UPDATE

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Selenium

Wilson County Rural Water District 1

NOTE: Wilson County Rural Water District 1 purchases water from Public Wholesale Water Supply District 23 which is required to test for selenium. Sample information shown below was taken by Public Wholesale Water Supply District 23.

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.40 ppb111.40 ppb
20131.30 ppb111.30 ppb
20141.000 ppb111.000 ppb
20151.10 ppb111.10 ppb
2016ND10ND
20171.10 ppb111.10 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

NOTE: Wilson County Rural Water District 1 purchases water from Public Wholesale Water Supply District 23 which is required to test for selenium. Sample information shown below was taken by Public Wholesale Water Supply District 23.

Date Lab ID Result
2012-02-21575646WS1.40 ppb
2013-03-05592967WS1.30 ppb
2014-02-24661031.000 ppb
2015-02-162803691.10 ppb
2016-02-24497954ND
2017-02-207116321.10 ppb