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EWG's Tap Water Database — 2021 UPDATE

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

Coachella Valley Water District: Cove Community

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.

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND100ND
2015ND30ND
2016ND10ND
2017ND10ND
2018ND30ND
2019ND100ND

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
2014-05-050013-279-1238ND
2014-06-130013-032-0954ND
2014-06-130013-199-0906ND
2014-06-130013-030-1036ND
2014-06-130013-084-0724ND
2014-06-130013-103-0809ND
2014-06-130013-105-0900ND
2014-06-130013-134-1008ND
2014-06-130013-129-0910ND
2014-06-130013-117-1000ND
2015-06-160013-279-1031ND
2015-09-150013-279-0927ND
2015-12-020013-279-1111ND
2016-03-239590-279-1010ND
2017-01-239590-224-1045ND
2018-09-269590-282-1140ND
2018-10-239590-281-1300ND
2018-12-129590-282-1155ND
2019-01-319590-281-0950ND
2019-03-069590-224-1017ND
2019-03-199590-282-1035ND
2019-05-229590-286-0836ND
2019-06-219590-282-1130ND
2019-06-219590-224-0840ND
2019-07-039590-289-0800ND
2019-08-299590-286-1240ND
2019-09-269590-224-1100ND
2019-11-209590-289-1050ND