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EWG's Tap Water Database — 2021 UPDATE

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2,3,7,8-TCDD (Dioxin)

Southern Nevada Water System

Dioxins are contaminants released from chemical manufacturing, pulp and paper bleaching, and incineration of products that contain chlorine. 2,3,7,8-Tetrachlorodibenzodioxin (2,3,7,8-TCDD) is the most toxic chemical in the group of dioxins. Read More.

Dioxins are among the most toxic known environmental pollutants. As a class, dioxins are extremely toxic, persistent and bioaccumulative; these contaminants build up and are stored in fatty tissues and fluids, such as breast milk, and pass from the mother to the child. Most people are exposed to dioxins through the food they eat, primarily from meat, dairy, fish and eggs. In humans, dioxins are associated with cancer, birth defects, damage to the nervous and immune systems, altered metabolism, thyroid disruption, altered menstrual cycling and damage to the cardiovascular system.

 

37

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND40ND
2015ND90ND
2016ND50ND
2017ND80ND
2018ND60ND
2019ND50ND

ppt = parts per trillion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.0002 ppt

The EWG Health Guideline of 0.0002 ppt for 2,3,7,8-TCDD was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

EPA Maximum Contaminant
Level (MCL) 0.03 ppt

ppt = parts per trillion

All test results

Date Lab ID Result
2014-02-1814020225-002ND
2014-02-1814020235-002ND
2014-08-1814080245-003ND
2014-08-1914080292-002ND
2015-02-1715020219-002ND
2015-02-1815020285-003ND
2015-05-0415040556-001ND
2015-08-2415080364-003ND
2015-08-2615080480-002ND
2015-09-2815090448-003AND
2015-09-2815090448-002AND
2015-12-2115120302-003ND
2015-12-2115120302-002ND
2016-02-0816020070-003ND
2016-02-0916020130-002ND
2016-05-2316050225-002ND
2016-05-2316050225-003ND
2016-08-09S1604052001ND
2017-02-13S1701128002ND
2017-02-14S1701207001ND
2017-02-14S1701207002ND
2017-05-22S1701203002ND
2017-05-22S1701203003ND
2017-08-28S1703629001ND
2017-08-28S1703629003ND
2017-08-28S1703629002ND
2018-02-06S1708762003ND
2018-02-06S1708762002ND
2018-02-06S1708762001ND
2018-08-07S1803807001ND
2018-08-07S1803807002ND
2018-08-07S1803807003ND
2019-02-12S1805444002ND
2019-02-12S1805444003ND
2019-02-12S1805444001ND
2019-08-13S1922741003ND
2019-08-13S1922741002ND