trans-1,2-Dichloroethylene
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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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | ND | 4 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 5 | 0 | ND |
| 2018 | ND | 5 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
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 | Result |
|---|---|
| 2014-02-12 | ND |
| 2014-06-06 | ND |
| 2014-09-10 | ND |
| 2014-11-06 | ND |
| 2015-03-16 | ND |
| 2015-06-01 | ND |
| 2015-08-24 | ND |
| 2015-12-07 | ND |
| 2016-03-02 | ND |
| 2016-05-12 | ND |
| 2016-08-30 | ND |
| 2016-11-10 | ND |
| 2017-03-01 | ND |
| 2017-03-01 | ND |
| 2017-05-11 | ND |
| 2017-08-24 | ND |
| 2017-10-04 | ND |
| 2018-01-22 | ND |
| 2018-06-04 | ND |
| 2018-06-27 | ND |
| 2018-08-15 | ND |
| 2018-11-08 | ND |
| 2019-03-13 | ND |
| 2019-05-30 | ND |
| 2019-09-27 | ND |