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EWG's Tap Water Database — 2019 UPDATE

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Selenium

Town of Gilbert

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.

 

53

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.454 ppb285ND - 3.10 ppb
2013ND120ND
2014ND10ND
2015ND10ND
2016ND100ND
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
2012-01-09PVA0476-01ND
2012-01-09PVA0475-01IND
2012-01-12PVA0815-01ND
2012-01-12PVA0814-01ND
2012-01-17PVA1028-01ND
2012-01-18PVA1137-01ND
2012-01-19PVA1240-01ND
2012-01-25PVA1556-01ND
2012-02-13PVB0899-01ND
2012-02-13PVB0898-01ND
2012-02-13PVB0897-01ND
2012-02-28PVB1867-01BND
2012-03-01PVC0073-01B3.10 ppb
2012-03-15PVC1257-01I2.00 ppb
2012-03-27PVC1957-012.60 ppb
2012-04-02PVD0073-01ND
2012-04-02PVD0064-012.40 ppb
2012-04-09PVD0611-01IND
2012-04-23PVD1652-01ND
2012-05-02PVE0219-01IND
2012-07-02PVG0068-01BND
2012-07-02PVG0062-01B2.60 ppb
2012-07-26PVG1876-01ND
2012-08-01PVH0103-01ND
2012-08-28PVH2122-01ND
2012-10-01PVJ0070-01IND
2012-10-01PVJ0072-01IND
2012-12-20PVL1426-01IND
2013-07-29550-7636-1ND
2013-07-29550-7634-1IND
2013-07-30550-7716-1IND
2013-07-30550-7713-1ND
2013-07-31550-7815-1IND
2013-07-31550-7810-1IND
2013-08-07550-8302-1ND
2013-08-12550-8579-1ND
2013-08-13550-8672-1ND
2013-08-26550-9435-1IND
2013-10-15201310150527IND
2013-10-22201310220364IND
2014-01-27201401270086IND
2015-01-28201501280356IND
2016-01-12201601120223IND
2016-01-19201601190321IND
2016-01-26201601260298IND
2016-02-08201602080053IND
2016-02-08201602080042IND
2016-03-02201603020441IND
2016-03-23201603230453IND
2016-04-07201604070686IND
2016-04-19201604190185IND
2016-05-31201605310460IND
2017-01-042017010408151ND