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EWG's Tap Water Database — 2021 UPDATE

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

Swta - Main System

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.

 

28

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
2014ND140ND
2015N/A00N/A
2016N/A00N/A
2017ND140ND
2018N/A00N/A
2019N/A00N/A

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
2014-04-167438015ND
2014-04-167438016ND
2014-04-167438019ND
2014-04-167438021ND
2014-04-237446113ND
2014-04-237446116ND
2014-04-237446120ND
2014-09-037594150ND
2014-09-037594188ND
2014-09-037594192ND
2014-09-037594191ND
2014-09-107600978ND
2014-09-107600980ND
2014-09-107600979ND
2017-04-1815985896ND
2017-04-1815986044ND
2017-04-1815985856ND
2017-04-1815985804ND
2017-04-1815985751ND
2017-04-1815985942ND
2017-06-0616305601ND
2017-07-2516613187ND
2017-07-2516613215ND
2017-07-2516613243ND
2017-07-2516613354ND
2017-07-2516613271ND
2017-07-2516613299ND
2017-12-1417203771ND