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EWG's Tap Water Database — 2021 UPDATE

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

Arizona Water Company - Sierra Vista

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.

 

21

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
2016ND140ND
2017N/A00N/A
2018ND70ND
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
2016-04-04201604050494SCND
2016-04-04201604050494SBND
2016-04-04201604050494SAND
2016-04-04201604050492SDND
2016-04-04201604050492SCND
2016-04-04201604050492SBND
2016-04-04201604050492SAND
2016-07-20201607210430SCND
2016-07-20201607210442SCND
2016-07-20201607210442SBND
2016-07-20201607210442SAND
2016-07-20201607210430SBND
2016-07-20201607210430SAND
2016-11-14201611150530SND
2018-01-23201802080309SAND
2018-01-23201802080314SCND
2018-01-23201802080314SBND
2018-01-23201802080314SAND
2018-01-23201802080309SDND
2018-01-23201802080309SCND
2018-01-23201802080309SBND