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EWG's Tap Water Database — 2021 UPDATE

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

City of Santa Clara

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.

 

46

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND50ND
2015ND80ND
2016ND100ND
2017ND50ND
2018ND90ND
2019ND90ND

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
2014-04-029590-030-1035ND
2014-08-269590-034-0930ND
2014-08-269590-027-1050ND
2014-08-279590-036-1030ND
2014-08-279590-011-0905ND
2015-08-179590-019-1045ND
2015-08-179590-004-0925ND
2015-08-192116-002-0955ND
2015-08-199590-015-1100ND
2015-08-209590-031-1010ND
2015-08-209590-007-1120ND
2015-08-249590-013-0950ND
2015-08-249590-014-1045ND
2016-08-159590-010-1055ND
2016-08-159590-016-1010ND
2016-08-159590-018-0915ND
2016-08-179590-029-1016ND
2016-08-179590-025-0918ND
2016-08-179590-005-1127ND
2016-08-189590-008-0956ND
2016-08-189590-023-0920ND
2016-08-189590-012-1035ND
2016-09-289590-026-0855ND
2017-04-249590-030-1120ND
2017-08-169590-011-0901ND
2017-08-169590-027-1012ND
2017-08-179590-036-1055ND
2017-10-049590-034-1007ND
2018-01-232116-022-1010ND
2018-08-139590-004-0908ND
2018-08-139590-026-1047ND
2018-08-159590-007-0942ND
2018-08-169590-031-0900ND
2018-08-169590-002-1000ND
2018-08-202116-019-1042ND
2018-08-209590-014-0840ND
2018-08-209590-013-1005ND
2019-08-149590-030-1002ND
2019-08-149590-022-0905ND
2019-08-209590-023-1200ND
2019-08-209590-018-1115ND
2019-08-209590-008-0945ND
2019-08-219590-029-0905ND
2019-08-219590-016-1009ND
2019-08-229590-010-0920ND
2019-10-019590-012-1031ND