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EWG's Tap Water Database — 2021 UPDATE

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

Castaic Lake Water Agency

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.

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND40ND
2015ND40ND
2016ND30ND
2017ND40ND
2018ND40ND
2019ND30ND

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
2014-07-309588-006-0930ND
2014-07-309588-005-0830ND
2014-11-219588-004-1155ND
2014-11-259588-005-1345ND
2015-01-149588-004-1220ND
2015-07-239590-004-0750ND
2015-07-239590-006-0940ND
2015-07-239590-005-0840ND
2016-07-209590-005-1115ND
2016-07-209590-006-1215ND
2016-07-209590-004-1035ND
2017-07-269590-005-1300ND
2017-07-269590-006-1405ND
2017-07-269590-004-1140ND
2017-11-159590-005-1115ND
2018-07-259590-005-1310ND
2018-07-259590-006-1350ND
2018-07-259590-004-1230ND
2018-10-119590-004-1010ND
2019-07-319590-005-1040ND
2019-07-319590-004-1000ND
2019-08-229590-006-1045ND