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EWG's Tap Water Database — 2019 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
2012ND180ND
2013N/A00N/A
2014N/A00N/A
2015ND190ND
2016N/A00N/A
2017N/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
2012-05-212155-004-1045ND
2012-05-212155-002-1135ND
2012-05-212155-006-1315ND
2012-05-222155-008-0955ND
2012-05-222155-007-0745ND
2012-05-222155-009-1035ND
2012-05-222155-010-1115ND
2012-05-222155-011-0835ND
2012-08-222155-001-0845ND
2012-08-222155-004-1000ND
2012-08-222155-006-1325ND
2012-08-222155-011-1300ND
2012-08-222155-008-1050ND
2012-08-222155-002-1025ND
2012-08-222155-009-1110ND
2012-08-232155-010-0855ND
2012-08-232155-007-0825ND
2012-08-232155-007-0855ND
2015-05-200013-007-0945ND
2015-05-200013-006-0945ND
2015-05-200013-010-0810ND
2015-05-200013-009-1100ND
2015-05-210013-001-0800ND
2015-05-210013-011-0955ND
2015-05-210013-002-1010ND
2015-05-210013-004-1250ND
2015-05-210013-008-1310ND
2015-08-190013-001-1225ND
2015-08-190013-002-1250ND
2015-08-190013-004-1320ND
2015-08-190013-006-0948ND
2015-08-190013-007-1120ND
2015-08-190013-008-1019ND
2015-08-190013-009-1044ND
2015-08-190013-010-1203ND
2015-08-190013-010-1225ND
2015-08-200013-011-0845ND