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EWG's Tap Water Database — 2021 UPDATE

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

San Gabriel Valley Water Company - Fontana

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.

 

73

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND210ND
2015ND100ND
2016ND90ND
2017ND180ND
2018ND120ND
2019ND30ND

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
2014-01-089588-003-1130ND
2014-01-109588-001-1045ND
2014-01-229588-022-1145ND
2014-01-229588-023-1030ND
2014-01-229588-028-1110ND
2014-03-059588-020-1120ND
2014-03-199588-006-0910ND
2014-03-269588-011-0900ND
2014-04-169588-064-0920ND
2014-04-179588-014-0835ND
2014-04-179588-031-0745ND
2014-05-279588-016-0925ND
2014-06-109588-038-0850ND
2014-07-099588-067-1100ND
2014-07-099588-068-1000ND
2014-07-239588-034-0945ND
2014-07-239588-026-0740ND
2014-07-239588-072-0910ND
2014-07-249588-041-0800ND
2014-07-319588-024-0740ND
2014-08-069588-027-1020ND
2015-01-309588-001-0815ND
2015-01-309588-023-0845ND
2015-01-309588-011-1050ND
2015-01-309588-003-0915ND
2015-02-269588-020-0820ND
2015-02-269588-007-0855ND
2015-05-119588-040-1045ND
2015-05-139588-033-0945ND
2015-05-139588-042-0900ND
2015-10-269588-063-1000ND
2016-01-259588-001-1030ND
2016-01-259588-003-0910ND
2016-02-179588-007-0925ND
2016-02-179588-022-0900ND
2016-02-179588-028-0830ND
2016-04-040013-043-1100ND
2016-05-049588-065-0745ND
2016-07-119588-037-1000ND
2016-11-299588-035-0930ND
2017-02-019588-001-0935ND
2017-02-019588-003-0810ND
2017-02-079588-027-1000ND
2017-02-079588-028-0930ND
2017-02-239588-022-1040ND
2017-02-249588-064-0910ND
2017-02-249588-026-0830ND
2017-03-319588-006-1010ND
2017-05-089588-011-1105ND
2017-05-099588-041-0925ND
2017-05-099588-024-1005ND
2017-06-199588-072-0850ND
2017-06-199588-034-0910ND
2017-07-269588-038-0830ND
2017-08-079588-067-1100ND
2017-09-149588-031-1320ND
2017-09-149588-044-1420ND
2017-09-149588-045-1340ND
2018-01-199588-076-0800ND
2018-03-129588-023-0940ND
2018-03-159588-020-0730ND
2018-03-159588-007-0810ND
2018-04-099588-040-1030ND
2018-05-219588-063-0840ND
2018-06-119588-037-1130ND
2018-06-259588-065-0900ND
2018-07-099588-033-1140ND
2018-07-179588-042-0954ND
2018-07-309588-045-0730ND
2018-07-309588-031-0800ND
2019-01-029588-076-1000ND
2019-06-179588-064-0915ND
2019-07-119588-043-0810ND