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EWG's Tap Water Database — 2021 UPDATE

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Selenium

Water Authority of Western Nassau

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.

MORE ABOUT THIS CONTAMINANT

 

74

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.191 ppb111ND - 2.10 ppb
20150.210 ppb101ND - 2.10 ppb
20160.275 ppb81ND - 2.20 ppb
20170.162 ppb131ND - 2.10 ppb
2018ND130ND
20190.247 ppb192ND - 2.70 ppb

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
2014-04-031404334-002-POCSND
2014-04-041404413-002-PRIND
2014-04-154B37-001-PRIND
2014-04-151404B37-003-PRIND
2014-06-261406K18-001-PRI2.10 ppb
2014-07-241407I28-004-PRIND
2014-07-241407I28-002-PRIND
2014-08-051408272-002-PRIND
2014-08-071408502-002-PRIND
2014-08-191408E03-002-PRIND
2014-08-191408E03-004-PRIND
2015-02-191502B82-002-PRIND
2015-03-171503B91-002-PRIND
2015-03-191503D92-002-PRI2.10 ppb
2015-03-311503L73-002-PRIND
2015-04-161504D00-002-PRIND
2015-04-2815104L90-002ND
2015-05-261505I52-001-PRIND
2015-05-261505I52-002-PRIND
2015-05-261505I52-003-PRIND
2015-07-071507395-002-PRIND
2016-02-031602317-004-PRIND
2016-02-031602317-006-PRIND
2016-03-311603O84-001-PRIND
2016-06-071606661-002-PRIND
2016-06-0916069-002-PRIND
2016-06-231606O29-002-PRIND
2016-08-021608251-002-PRI2.20 ppb
2016-08-041608542-001-PRIND
2017-01-17709292008-PRIND
2017-01-17709292007-PRIND
2017-01-17709292009-PRIND
2017-01-17709292004-PRIND
2017-01-19709502006-PRIND
2017-01-19709502002-PRIND
2017-01-19709502004-PRIND
2017-02-027010479002-PRIND
2017-05-237019330002-PRIND
2017-05-257019670003-PRIND
2017-05-257019670004-PRIND
2017-05-25701967002-PRIND
2017-08-017025877002-PRI2.10 ppb
2018-01-167040545004-PRIND
2018-01-167040545005-PRIND
2018-01-16704054003-PRIND
2018-01-167040545002-PRIND
2018-01-187040828007-PRIND
2018-01-187040828011-PRIND
2018-01-187040828003-PRIND
2018-01-187040828005-PRIND
2018-02-157043097002-PRIND
2018-06-197055477001-PRIND
2018-06-197055477003-PRIND
2018-06-197055477002-PRIND
2018-07-197058888002-PRIND
2019-01-297077818009-PRIND
2019-01-297077818010-PRIND
2019-01-297077818005-PRIND
2019-01-317078075001-PRIND
2019-01-317078075004-PRIND
2019-01-317078075007-PRIND
2019-01-317078075002ND
2019-01-317078075010-PRI2.70 ppb
2019-01-317078075011-PRIND
2019-02-147079642002-PRIND
2019-04-257087239001-PRIND
2019-06-047092027001-PRIND
2019-06-047092027002-PRI2.00 ppb
2019-06-047092027003-PRIND
2019-07-037096363001ND
2019-08-2770102934002-PRIND
2019-09-1070104400002-PRIND
2019-09-2470106092002-PRIND
2019-12-1770115702002-PRIND