trans-1,2-Dichloroethylene
Salem 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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 2 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 2 | 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 |
|---|---|---|
| 2014-02-19 | 1402-00360-001 | ND |
| 2014-07-22 | 1407-00658-001 | ND |
| 2015-03-09 | 1503-00536-001 | ND |
| 2015-08-18 | 1508-01552-001 | ND |
| 2016-03-07 | 1603-00674-001 | ND |
| 2016-07-07 | 1607-00564-001 | ND |
| 2017-02-22 | 1702-01614-001 | ND |
| 2017-07-18 | 1707-02043-001 | ND |
| 2018-02-15 | 1802-01345-001 | ND |
| 2018-07-02 | 1807-00228-001 | ND |
| 2019-02-07 | 1902-00602-001 | ND |
| 2019-07-11 | 1907-01496-001 | ND |