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EWG's Tap Water Database — 2021 UPDATE

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

Santa Clara Valley Water District

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.

 

54

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND90ND
2015ND210ND
2016ND60ND
2017ND60ND
2018ND60ND
2019ND60ND

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
2014-08-129590-011-0901ND
2014-08-129590-007-1010ND
2014-08-122116-005-1021ND
2014-11-122400-024-1103ND
2014-11-122116-024-1103ND
2014-11-122400-023-0949ND
2014-11-122116-023-0949ND
2014-11-122400-022-1030ND
2014-11-122116-022-1030ND
2015-02-232400-022-1200ND
2015-02-239590-022-1200ND
2015-02-232400-023-1100ND
2015-02-239590-023-1100ND
2015-02-232400-024-1240ND
2015-02-239590-024-1240ND
2015-05-189590-023-0855ND
2015-05-182400-023-0855ND
2015-05-182116-024-0920ND
2015-05-182400-022-0950ND
2015-05-182116-022-0950ND
2015-05-182400-024-0920ND
2015-05-199590-005-0935ND
2015-05-192400-005-0935ND
2015-05-199590-007-0928ND
2015-05-192400-007-0928ND
2015-05-192400-011-0818ND
2015-05-199590-011-0818ND
2015-08-189590-022-1030ND
2015-09-219590-023-1105ND
2015-09-212116-024-1110ND
2016-02-232400-011-0800ND
2016-02-239590-011-0950ND
2016-02-232400-005-0930ND
2016-02-239590-005-0823ND
2016-02-239590-007-0932ND
2016-02-232400-007-0932ND
2017-05-169590-007-0950ND
2017-05-169590-011-0845ND
2017-08-222116-005-0800ND
2017-11-082116-023-1015ND
2017-11-089590-022-1023ND
2017-11-152116-024-1340ND
2018-08-219590-007-1152ND
2018-08-219590-005-1323ND
2018-08-219590-011-1006ND
2018-08-229590-024-1017ND
2018-08-229590-023-1448ND
2018-08-229590-022-1055ND
2019-05-219590-011-0851ND
2019-05-219590-007-1049ND
2019-05-219590-005-1056ND
2019-05-222116-024-1205ND
2019-05-229590-023-1057ND
2019-05-229590-022-1249ND