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EWG's Tap Water Database — 2019 UPDATE

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

Carson City Public Works

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.

 

62

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND110ND
2013ND70ND
2014ND60ND
2015ND270ND
2016ND20ND
2017ND90ND

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
2012-06-19201206210314ND
2012-06-19201206210314-IND
2012-06-21201206220321-IND
2012-06-25201206270216-IND
2012-06-25201206270244-IND
2012-07-11201207130064-IND
2012-08-08201208100396-IND
2012-09-18201209200453-IND
2012-10-02201210030297-IND
2012-10-22201210230058-IND
2012-11-13201211150453-IND
2013-06-18201306190582-IND
2013-06-26201306270194-IND
2013-07-18201307200001-IND
2013-07-23201307240749ND
2013-09-09201309100461-IND
2013-09-24201309250203-IND
2013-09-25201309260254-IND
2014-02-24201402260926-SND
2014-05-27201405280345ND
2014-05-27201405280593-SND
2014-07-30201407310297ND
2014-08-06201408070556ND
2014-08-06201408070473ND
2015-06-29201506300124-IOCND
2015-07-14201507150299ND
2015-08-11201508130887ND
2015-08-11201508130514ND
2015-08-12201508130840ND
2015-08-12201508130550ND
2015-08-12201508130715ND
2015-08-13201508140330ND
2015-08-13201508140232ND
2015-08-13201508140374ND
2015-08-19201508200389ND
2015-08-19201508200613ND
2015-08-19201508200673ND
2015-08-27201508280218ND
2015-09-01201509030215ND
2015-09-01201509030285ND
2015-09-01201509030305ND
2015-09-01551469ND
2015-09-23201509250224ND
2015-09-23201509250228ND
2015-09-23201509250220ND
2015-09-2310324098001ND
2015-09-23201509250297ND
2015-09-24201509250185ND
2015-09-24201509250183ND
2015-09-24201509250171ND
2015-10-13201510140575ND
2016-06-22201606230265-SOCND
2016-10-11201610121069ND
2017-05-15201705160571ND
2017-06-13201706140424ND
2017-06-21201706220614ND
2017-08-01201708021373ND
2017-08-29201708300813ND
2017-08-29201708300722ND
2017-08-29201708300644ND
2017-10-04201710050218ND
2017-10-04201710050544ND