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EWG's Tap Water Database — 2021 UPDATE

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

California Water Service - Stockton

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.

 

26

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015ND40ND
2016ND10ND
2017ND50ND
2018ND70ND
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
2015-08-161228-133-1900ND
2015-10-269590-060-1145ND
2015-11-199590-059-1056ND
2015-12-099590-018-0553ND
2016-02-239590-061-1110ND
2017-04-189590-133-1146ND
2017-07-129590-133-1420ND
2017-07-139590-029-1354ND
2017-10-109590-058-0950ND
2017-10-109590-133-1110ND
2018-01-029590-054-1115ND
2018-01-039590-133-0950ND
2018-04-059590-133-1320ND
2018-04-119590-050-1225ND
2018-07-099590-056-1305ND
2018-07-099590-133-1100ND
2018-10-099590-133-1325ND
2019-01-029590-133-1301ND
2019-02-149590-061-1430ND
2019-04-029590-133-1235ND
2019-04-232116-053-1145ND
2019-05-089590-007-1120ND
2019-07-099590-133-1400ND
2019-10-019590-067-1150ND
2019-10-029590-028-1300ND
2019-10-099590-133-1059ND