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EWG's Tap Water Database — 2021 UPDATE

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

Centennial Park Domestic Water Improvement District

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.

 

20

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
2016ND10ND
2017ND160ND
2018ND30ND
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
2016-08-29201608300195SND
2017-02-21201703030291CSND
2017-02-21201703030291BSND
2017-02-21201703030291ASND
2017-03-13201703210530SND
2017-05-15201706010885SDND
2017-05-15201706010885SCND
2017-05-15201706010885SBND
2017-05-15201706010885SAND
2017-08-23201708240186DSND
2017-08-23201708240186CSND
2017-08-23201708240186BSND
2017-08-23201708240186ASND
2017-10-23201710300120SDND
2017-10-23201710300120SCND
2017-10-23201710300120SBND
2017-10-23201710300120SAND
2018-05-30201805310335SCND
2018-05-30201805310335SBND
2018-09-11201809120468SBND