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EWG's Tap Water Database — 2021 UPDATE

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

North Kona

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.

 

39

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
2015N/A00N/A
2016ND180ND
2017N/A00N/A
2018ND140ND
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
2016-03-15ND
2016-03-15ND
2016-03-15ND
2016-03-21ND
2016-03-21ND
2016-03-21ND
2016-03-21ND
2016-03-21ND
2016-03-21ND
2016-05-24ND
2016-05-24ND
2016-05-24ND
2016-05-24ND
2016-05-24ND
2016-05-24ND
2016-05-24ND
2016-05-25ND
2016-05-25ND
2018-05-22201805170773ND
2018-05-22201805170778ND
2018-05-23201805170774ND
2018-05-23201805290216ND
2018-05-23201805290227ND
2018-05-23201805290225ND
2018-07-08201805230559ND
2018-10-15201810170192ND
2018-10-22201810240383ND
2018-10-22201810240336ND
2018-10-29201810310535ND
2018-10-29201810310336ND
2018-10-29201810310409ND
2018-10-29201810310350ND
2019-01-07201901090296ND
2019-01-07201901090308ND
2019-04-29201905010517ND
2019-07-15201907170652ND
2019-07-15201907170514ND
2019-09-09201909100461ND
2019-10-09201910110607ND