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EWG's Tap Water Database — 2021 UPDATE

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

San Jose Water Company

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.

 

42

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
2014ND80ND
2015N/A00N/A
2016ND40ND
2017ND180ND
2018ND50ND
2019ND70ND

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
2014-05-091228-025-0845ND
2014-05-161228-179-1310ND
2014-05-161228-178-1300ND
2014-10-101228-186-0950ND
2014-10-101228-185-0820ND
2014-10-101228-184-0840ND
2014-10-101228-182-0920ND
2014-10-101228-181-0915ND
2016-05-049590-198-1200ND
2016-05-201228-075-0900ND
2016-07-269590-197-1230ND
2016-10-211228-168-0910ND
2017-01-101228-126-0904ND
2017-01-171228-027-0950ND
2017-01-191228-029-1210ND
2017-03-271228-168-0900ND
2017-04-261228-126-1015ND
2017-05-081228-027-0925ND
2017-05-091228-156-0955ND
2017-05-101228-029-0920ND
2017-06-081228-168-0930ND
2017-07-201228-131-0910ND
2017-07-211228-111-1035ND
2017-07-311228-168-0855ND
2017-08-171228-180-0840ND
2017-09-291228-177-1105ND
2017-11-071228-168-0910ND
2017-11-071228-180-0845ND
2017-12-071228-111-1250ND
2017-12-141228-075-1335ND
2018-01-171228-202-1135ND
2018-01-171228-075-1150ND
2018-04-301228-202-0945ND
2018-04-301228-075-0950ND
2018-06-281228-199-1155ND
2019-01-161228-199-0915ND
2019-01-291228-202-0840ND
2019-01-291228-075-0815ND
2019-04-111228-202-1105ND
2019-04-111228-075-1105ND
2019-05-061228-199-1015ND
2019-07-231228-199-0945ND