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EWG's Tap Water Database — 2019 UPDATE

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trans-1,2-Dichloroethylene

Tri County Joint Municipal Authority

1,2-Dichloroethylene, a neurotoxic solvent, exists in two different forms: trans-1,2-dichloroethylene and cis-1,2-dichloroethylene. A mixture of the two forms is used to manufacture other solvents and chemical products.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND20ND
2014ND90ND
2015ND20ND
2016ND10ND
2017ND10ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 60 ppb

The EWG Health Guideline of 60 ppb for trans-1,2-dichloroethylene was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against harm to internal organs.

EPA Maximum Contaminant
Level (MCL) 100 ppb

The legal limit for trans-1,2-dichloroethylene, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1980s.

ppb = parts per billion

All test results

Date Lab ID Result
2012-06-1412 28481ND
2013-09-113090855-01ND
2013-09-123091059-01ND
2014-02-204021747-01ND
2014-03-214031896-01ND
2014-04-044040494-01ND
2014-05-094051036-01ND
2014-05-094051036-02ND
2014-08-084080935-02ND
2014-08-084080935-01ND
2014-11-074110753-01ND
2014-11-074110753-02ND
2015-04-2412698086ND
2015-04-2412698066ND
2016-05-2014338735ND
2017-12-0717241118ND