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EWG's Tap Water Database — 2019 UPDATE

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Selenium

City of Phoenix

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.600 ppb51ND - 3.00 ppb
20132.00 ppb112.00 ppb
20140.486 ppb71ND - 3.40 ppb
2015ND10ND
2016ND10ND
2017ND50ND

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
2012-01-032012000421ND
2012-01-032012000419ND
2012-01-042010248-023.00 ppb
2012-01-092012001235ND
2012-01-102012001855ND
2013-01-023010074-012.00 ppb
2014-01-064010287-01I3.40 ppb
2014-01-152014001121ND
2014-01-162014001135ND
2014-01-162014001407ND
2014-01-212014003196ND
2014-01-212014003180ND
2014-02-262014009692ND
2015-01-07201501070258IND
2016-01-06201601060265IND
2017-01-04201701040662IND
2017-01-112017001856ND
2017-01-182017002436ND
2017-01-182017002423ND
2017-01-252017004351ND