trans-1,2-Dichloroethylene
Decker Hills
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 | 1 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 4 | 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 | Lab ID | Result |
|---|---|---|
| 2014-04-15 | AC50585 | ND |
| 2015-09-23 | AD08265 | ND |
| 2015-09-23 | AD08263 | ND |
| 2015-09-23 | AD08267 | ND |
| 2015-09-23 | AD08259 | ND |
| 2016-06-01 | AD38987 | ND |
| 2016-06-01 | AD38989 | ND |
| 2016-06-01 | AD38973 | ND |
| 2016-06-01 | AD38981 | ND |
| 2017-08-25 | AD94469 | ND |
| 2017-08-25 | AD94483 | ND |
| 2017-08-25 | AD94481 | ND |
| 2017-08-25 | AD94475 | ND |
| 2018-07-09 | AE32630 | ND |
| 2018-07-09 | AE32626 | ND |
| 2018-07-09 | AE32644 | ND |
| 2018-07-09 | AE32636 | ND |
| 2019-03-19 | AE59057 | ND |
| 2019-03-19 | AE59039 | ND |
| 2019-03-19 | AE59055 | ND |
| 2019-03-19 | AE59037 | ND |