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EWG's Tap Water Database — 2021 UPDATE

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

Chino Basin Desalter Authority - Desalter 2

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.

 

45

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND20ND
2015ND180ND
2016ND10ND
2017ND30ND
2018ND200ND
2019ND10ND

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
2014-01-220013-008-1010ND
2014-01-220013-001-1055ND
2015-01-220013-002-1035ND
2015-01-220013-005-0945ND
2015-01-280013-001-1210ND
2015-01-280013-010-0950ND
2015-01-280013-009-1050ND
2015-01-280013-003-0940ND
2015-01-280013-004-1045ND
2015-04-210013-001-2250ND
2015-04-210013-010-0905ND
2015-04-210013-009-1130ND
2015-04-210013-005-1125ND
2015-04-210013-004-1020ND
2015-04-210013-003-0905ND
2015-04-210013-002-1030ND
2015-05-200013-007-1045ND
2015-08-120013-007-1200ND
2015-08-130013-008-0900ND
2015-11-050013-008-1005ND
2016-01-200013-001-1125ND
2017-01-180013-001-1110ND
2017-12-220013-016-0945ND
2017-12-220013-015-0830ND
2018-01-100013-008-1030ND
2018-01-100013-010-0900ND
2018-01-100013-009-1145ND
2018-01-170013-001-1045ND
2018-01-170013-003-1050ND
2018-01-170013-004-0910ND
2018-01-170013-002-1150ND
2018-01-170013-005-1145ND
2018-01-170013-007-0920ND
2018-03-280013-015-0905ND
2018-03-280013-016-1000ND
2018-04-100013-009-1155ND
2018-04-100013-007-1040ND
2018-04-100013-008-0830ND
2018-04-100013-010-0945ND
2018-04-110013-005-0845ND
2018-04-110013-001-1030ND
2018-04-110013-002-0845ND
2018-04-110013-004-1130ND
2018-04-110013-003-1030ND
2019-02-120013-001-1030ND