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EWG's Tap Water Database — 2021 UPDATE

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

City of Morgan Hill

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.

 

39

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
2014ND80ND
2015ND20ND
2016ND120ND
2017ND30ND
2018ND20ND
2019ND120ND

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
2014-05-120013-032-0920ND
2014-05-120013-017-1015ND
2014-05-280013-012-0930ND
2014-06-230013-010-0815ND
2014-09-100013-032-1020ND
2014-09-100013-017-0950ND
2014-09-100013-010-0920ND
2014-09-100013-012-0845ND
2015-05-180013-002-0900ND
2015-07-211228-001-1010ND
2016-05-091228-015-0930ND
2016-05-091228-016-0730ND
2016-05-091228-009-0900ND
2016-05-091228-008-0815ND
2016-05-161228-040-0830ND
2016-05-161228-043-0740ND
2016-08-221228-015-1000ND
2016-08-221228-009-0930ND
2016-08-221228-008-0830ND
2016-08-221228-016-0900ND
2016-08-221228-043-0730ND
2016-08-221228-040-0800ND
2017-05-081228-017-0900ND
2017-05-081228-032-0800ND
2017-05-221228-012-0720ND
2018-10-301228-001-0930ND
2018-12-111228-001-0730ND
2019-05-071228-040-0715ND
2019-05-071228-043-0630ND
2019-05-071228-016-0930ND
2019-05-071228-015-0830ND
2019-05-071228-009-0800ND
2019-05-071228-008-1000ND
2019-09-101228-040-1000ND
2019-09-101228-016-0900ND
2019-09-101228-043-0940ND
2019-09-101228-015-0800ND
2019-09-101228-009-0730ND
2019-09-101228-008-0830ND