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EWG's Tap Water Database — 2021 UPDATE

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

City of La Habra

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.

 

27

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
2014ND90ND
2015ND30ND
2016ND30ND
2017ND30ND
2018ND30ND
2019ND60ND

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
2014-01-179588-031-1107ND
2014-01-179588-028-1141ND
2014-04-149588-028-1412ND
2014-04-169588-031-1250ND
2014-07-219588-031-1508ND
2014-07-219588-028-1429ND
2014-09-049588-031-1055ND
2014-09-049588-028-1151ND
2014-09-049588-004-1124ND
2015-09-219588-028-1515ND
2015-09-219588-004-1400ND
2015-09-219588-031-1450ND
2016-09-169588-031-1100ND
2016-09-169588-028-1125ND
2016-10-049588-004-1530ND
2017-09-259588-028-1145ND
2017-09-279588-031-1435ND
2017-11-179588-004-1152ND
2018-09-149588-031-1042ND
2018-09-149588-028-1111ND
2018-09-149588-004-1140ND
2019-09-119588-031-1100ND
2019-09-119588-028-1025ND
2019-09-119588-004-1140ND
2019-12-049588-028-1028ND
2019-12-049588-031-1008ND
2019-12-049588-004-0000ND