trans-1,2-Dichloroethylene
Johnson Utilities
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 8 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 6 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2015-03-04 | 201503040387V | ND |
| 2015-03-04 | 201503040388V | ND |
| 2015-03-04 | 201503040389V | ND |
| 2015-03-04 | 201503040390V | ND |
| 2015-03-04 | 201503040391V | ND |
| 2015-06-17 | 201506170544V | ND |
| 2015-10-15 | 201510150153V | ND |
| 2015-10-15 | 201510150154V | ND |
| 2018-02-01 | 201802020002V | ND |
| 2018-02-01 | 201802020003V | ND |
| 2018-02-01 | 201802020004V | ND |
| 2018-02-01 | 201802020005V | ND |
| 2018-02-06 | 201802060706V | ND |
| 2018-02-06 | 201802060707V | ND |