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EWG's Tap Water Database — 2019 UPDATE

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Selenium

Philadelphia Water Department

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.

 

63

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013ND120ND
2014ND120ND
2015ND120ND
2016ND120ND
2017ND120ND

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
2012-10-02DW121002-003ND
2012-10-02DW121002-000ND
2012-10-02DW121002-001ND
2013-01-08DW130108-000ND
2013-01-08DW130108-003ND
2013-01-08DW130108-001ND
2013-04-09DW130409-001ND
2013-04-09DW130409-003ND
2013-04-09DW130409-002ND
2013-07-09DW130709-001ND
2013-07-09DW130709-003ND
2013-07-09DW130709-002ND
2013-10-08DW131008-002ND
2013-10-08DW131008-001ND
2013-10-08DW131008-003ND
2014-01-07DW140107-002ND
2014-01-07DW140107-001ND
2014-01-07DW140107-003ND
2014-04-08DW140408-002ND
2014-04-08DW140408-001ND
2014-04-08DW140408-003ND
2014-07-08DW140708-002ND
2014-07-08DW140708-001ND
2014-07-08DW140708-004ND
2014-10-07DW141007-013ND
2014-10-07DW141007-040ND
2014-10-07DW141007-021ND
2015-01-0612291999ND
2015-01-0612291997ND
2015-01-0612291998ND
2015-04-0712637822ND
2015-04-0712637823ND
2015-04-0712637824ND
2015-07-0713017882ND
2015-07-0713017883ND
2015-07-0713017884ND
2015-10-0613394065ND
2015-10-0613394064ND
2015-10-0613394066ND
2016-01-0513758223ND
2016-01-0513758222ND
2016-01-0513758221ND
2016-04-0514109303ND
2016-04-0514109302ND
2016-04-0514109304ND
2016-07-1214577164ND
2016-07-1214577166ND
2016-07-1214577165ND
2016-10-0415082306ND
2016-10-0415082308ND
2016-10-0415082307ND
2017-01-1015523189ND
2017-01-1015523190ND
2017-01-1015523188ND
2017-04-0415944741ND
2017-04-0415944742ND
2017-04-0415944740ND
2017-07-1116420513ND
2017-07-1116420512ND
2017-07-1116420514ND
2017-10-0316886157ND
2017-10-0316886156ND
2017-10-0316886155ND