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EWG's Tap Water Database — 2019 UPDATE

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Selenium

City of Wichita Falls

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
20134.61 ppb224.37 ppb - 4.85 ppb
20140.575 ppb42ND - 1.30 ppb
20150.700 ppb42ND - 1.60 ppb
20160.600 ppb21ND - 1.20 ppb
2017ND20ND

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
2013-09-25Q13081440244.85 ppb
2013-09-25Q13081440224.37 ppb
2014-05-13Q14158160021.30 ppb
2014-08-14Q14367960211.000 ppb
2014-11-12AC71808ND
2014-11-12AC71809ND
2015-02-09Q15050190071.20 ppb
2015-02-09Q1505019006ND
2015-05-11Q1517193002ND
2015-09-22Q15370190021.60 ppb
2016-02-01Q16041900031.20 ppb
2016-02-01Q1604190002ND
2017-03-06Q1709227003ND
2017-08-07Q1733093007ND