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EWG's Tap Water Database — 2021 UPDATE

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

City of Gilroy

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.

 

37

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015ND190ND
2016N/A00N/A
2017N/A00N/A
2018ND180ND
2019N/A00N/A

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
2015-05-200013-009-1100ND
2015-05-200013-007-0945ND
2015-05-200013-010-0810ND
2015-05-200013-006-0945ND
2015-05-210013-008-1310ND
2015-05-210013-002-1010ND
2015-05-210013-011-0955ND
2015-05-210013-001-0800ND
2015-05-210013-004-1250ND
2015-08-190013-010-1203ND
2015-08-190013-008-1019ND
2015-08-190013-009-1044ND
2015-08-190013-007-1120ND
2015-08-190013-006-0948ND
2015-08-190013-010-1225ND
2015-08-190013-004-1320ND
2015-08-190013-002-1250ND
2015-08-190013-001-1225ND
2015-08-200013-011-0845ND
2018-05-031228-007-1030ND
2018-05-031228-009-0815ND
2018-05-031228-010-1000ND
2018-05-031228-011-0930ND
2018-05-031228-008-0755ND
2018-05-031228-006-1106ND
2018-05-031228-004-0835ND
2018-05-031228-001-0905ND
2018-05-241228-002-0805ND
2018-08-131228-008-0955ND
2018-08-131228-007-0940ND
2018-08-131228-006-1030ND
2018-08-131228-009-1010ND
2018-08-131228-004-0830ND
2018-08-131228-002-0815ND
2018-08-131228-010-0925ND
2018-08-131228-001-0800ND
2018-08-131228-011-0740ND