trans-1,2-Dichloroethylene
Redmond Water Department
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 | 7 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 7 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2014-06-09 | B4F091102-V | ND |
| 2014-06-09 | B4F091103-V | ND |
| 2014-06-09 | B4F091104-V | ND |
| 2014-06-09 | B4F091105-V | ND |
| 2014-06-09 | B4F091106-V | ND |
| 2014-06-09 | B4F091107-V | ND |
| 2014-06-19 | B4F091101-V | ND |
| 2017-02-21 | 1708685-V | ND |
| 2017-02-21 | 1708666-V | ND |
| 2017-05-31 | 1728864-V | ND |
| 2017-05-31 | 1728868-V | ND |
| 2017-06-20 | 1733199-V | ND |
| 2017-07-27 | 1741510-V | ND |
| 2017-07-27 | 1741513-V | ND |