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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 1

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.

 

93

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND140ND
2015ND150ND
2016ND170ND
2017ND160ND
2018ND130ND
2019ND180ND

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
2014-07-020013-001-0845ND
2014-07-020013-002-0745ND
2014-07-020013-004-0600ND
2014-07-090013-008-0745ND
2014-07-090013-007-0915ND
2014-07-090013-006-0845ND
2014-07-090013-005-0645ND
2014-07-160013-013-0915ND
2014-07-160013-011-0800ND
2014-07-160013-010-0700ND
2014-07-160013-009-0600ND
2014-07-230013-020-0904ND
2014-07-230013-015-0600ND
2014-08-130013-014-0900ND
2015-02-180013-009-1400ND
2015-07-010013-001-0910ND
2015-07-010013-004-1014ND
2015-07-010013-002-0830ND
2015-07-080013-005-0730ND
2015-07-080013-009-0915ND
2015-07-080013-011-1123ND
2015-07-080013-008-0820ND
2015-07-080013-010-1020ND
2015-07-150013-021-0740ND
2015-07-150013-021-0650ND
2015-07-220013-007-1045ND
2015-07-220013-013-0945ND
2015-07-220013-014-0853ND
2015-07-220013-006-1122ND
2016-04-040013-015-0945ND
2016-07-060013-005-0600ND
2016-07-060013-010-0910ND
2016-07-060013-008-0650ND
2016-07-060013-009-0800ND
2016-07-130013-021-0630ND
2016-07-130013-016-0800ND
2016-07-130013-017-0845ND
2016-07-130013-007-0630ND
2016-07-130013-006-0700ND
2016-07-200013-014-0900ND
2016-07-200013-020-1000ND
2016-07-200013-013-0800ND
2016-07-200013-011-0700ND
2016-07-270013-001-0700ND
2016-07-270013-002-0730ND
2016-07-270013-004-0845ND
2017-07-050013-008-0815ND
2017-07-050013-010-1130ND
2017-07-050013-009-1030ND
2017-07-050013-005-0940ND
2017-07-120013-024-0630ND
2017-07-120013-020-0600ND
2017-07-120013-023-0930ND
2017-07-190013-014-0730ND
2017-07-190013-015-0830ND
2017-07-190013-013-0630ND
2017-07-190013-011-0530ND
2017-07-260013-006-0900ND
2017-07-260013-021-0700ND
2017-07-260013-007-0930ND
2017-08-020013-001-0700ND
2017-08-020013-004-0815ND
2018-07-120013-007-1050ND
2018-07-120013-006-0930ND
2018-07-120013-021-0700ND
2018-07-310013-001-0445ND
2018-07-310013-002-0530ND
2018-07-310013-004-0830ND
2018-08-020013-011-1005ND
2018-08-020013-013-1020ND
2018-08-020013-015-1030ND
2018-08-020013-014-1025ND
2018-08-070013-024-1030ND
2018-08-070013-023-0945ND
2018-08-140013-020-0730ND
2019-07-170013-009-0900ND
2019-07-170013-008-0830ND
2019-07-170013-005-0745ND
2019-07-170013-010-0800ND
2019-07-240013-014-0900ND
2019-07-240013-015-1000ND
2019-07-240013-013-0930ND
2019-07-240013-011-0830ND
2019-07-310013-021-0945ND
2019-07-310013-007-0900ND
2019-07-310013-006-1000ND
2019-08-070013-023-0800ND
2019-08-070013-024-0730ND
2019-08-140013-020-0830ND
2019-08-140013-009-0830ND
2019-08-270013-002-1005ND
2019-08-270013-004-1100ND
2019-08-270013-001-0905ND