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EWG's Tap Water Database — 2019 UPDATE

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

Oyster Bay Water District

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.

 

25

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013N/A00N/A
2014ND50ND
2015ND50ND
2016ND50ND
2017ND50ND

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
2012-12-191212988-001-SOCSND
2012-12-191212988-002-SOCSND
2012-12-191212988-004-SOCSND
2012-12-191212988-003-SOCSND
2012-12-211212B33-001-SOCSND
2014-06-041406268-001-SOCSND
2014-06-041406268-003-SOCSND
2014-06-041406268-002-SOCSND
2014-06-041406268-004-SOCSND
2014-06-041406268-005-SOCSND
2015-05-201505E61-001-SOCSND
2015-05-201505E61-004-SOCSND
2015-05-201505E61-005-SOCSND
2015-05-201505E61-002-SOCSND
2015-05-201505E61-003-SOCSND
2016-06-281606Q85-003-SOCSND
2016-06-281606Q85-002-SOCSND
2016-06-281606Q85-004-SOCSND
2016-06-281606Q85-001-SOCSND
2016-06-291606S10-001-SOCSND
2017-06-277022481001ND
2017-06-277022481003ND
2017-06-277022481002ND
2017-06-277022481005ND
2017-06-277022481004ND