trans-1,2-Dichloroethylene
Crawford
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 | 2 | 0 | ND |
| 2015 | ND | 6 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 1 | 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 | Lab ID | Result |
|---|---|---|
| 2014-04-30 | AI39283 | ND |
| 2014-11-03 | AI58821 | ND |
| 2015-01-27 | AI63563 | ND |
| 2015-01-27 | AI63562 | ND |
| 2015-04-27 | AI75660 | ND |
| 2015-08-04 | AI85416 | ND |
| 2015-08-04 | AI85415 | ND |
| 2015-08-04 | AI85414 | ND |
| 2016-04-12 | AJ09952 | ND |
| 2017-06-07 | AJ57016 | ND |
| 2018-05-08 | AJ89023 | ND |
| 2018-05-08 | AJ89022 | ND |
| 2018-06-25 | AJ92363 | ND |
| 2018-06-25 | AJ92362 | ND |
| 2018-11-05 | AK05285 | ND |
| 2019-01-30 | AK10248 | ND |
| 2019-01-30 | AK10247 | ND |
| 2019-04-16 | AK15334 | ND |