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EWG's Tap Water Database — 2021 UPDATE

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

City of San Jose - EVG/EDV/COY

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.

 

25

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
2014ND110ND
2015N/A00N/A
2016N/A00N/A
2017ND130ND
2018N/A00N/A
2019ND10ND

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
2014-02-182116-012-0902ND
2014-02-252116-006-0859ND
2014-02-252116-005-0948ND
2014-03-271228-004-0900ND
2014-03-271228-003-0810ND
2014-03-271228-001-1130ND
2014-03-271228-002-1000ND
2014-08-051228-007-0920ND
2014-08-261228-013-0918ND
2014-08-261228-012-1008ND
2014-08-261228-011-1125ND
2017-01-171228-001-1036ND
2017-01-171228-002-0834ND
2017-01-171228-004-0925ND
2017-01-311228-003-0819ND
2017-04-111228-001-1125ND
2017-04-111228-004-0850ND
2017-04-111228-003-0755ND
2017-04-111228-002-0950ND
2017-05-021228-011-1002ND
2017-08-011228-012-0950ND
2017-08-011228-011-1030ND
2017-09-261228-013-1030ND
2017-12-191228-013-0920ND
2019-05-141228-012-0949ND