Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

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

Waialee-sunset Beach

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND70ND
2015N/A00N/A
2016ND10ND
2017ND50ND
2018ND20ND
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
2014-02-19201402210361ND
2014-02-20201402220088ND
2014-07-21201407230664ND
2014-07-21201407230666ND
2014-10-31201411040537ND
2014-10-31201411040538ND
2014-11-12201411140850ND
2016-07-05ND
2017-01-04ND
2017-02-23ND
2017-10-10ND
2017-10-31ND
2017-10-31ND
2018-04-25201804300496ND
2018-08-13201808160452ND
2019-02-19201902210382ND