Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Selenium

Pennsylvania American Royersford

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND60ND
2013ND10ND
2014ND10ND
2015ND50ND
2016ND10ND
2017ND10ND

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
2012-04-1017211501ND
2012-08-0718201301ND
2012-08-0718201601ND
2012-08-0718201701ND
2012-08-0718201801ND
2012-08-0718895301ND
2013-08-0823076901ND
2014-08-1226516801ND
2015-08-0613131567ND
2015-08-0613131581ND
2015-08-0613131594ND
2015-08-0613131554ND
2015-09-1613260297ND
2016-08-0414730039ND
2017-08-1516560908ND