trans-1,2-Dichloroethylene
Town of Oakland
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 | 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 |
|---|---|---|
| 2014-04-21 | 0110008_01_04649 | ND |
| 2014-04-21 | 0110008_02_04649 | ND |
| 2015-06-15 | E15003950001 | ND |
| 2015-06-15 | E15003950004 | ND |
| 2016-05-24 | E16004469001 | ND |
| 2016-05-24 | E16004478001 | ND |
| 2017-04-25 | E17004235004 | ND |
| 2017-04-25 | E17004235008 | ND |
| 2018-05-10 | E18004086004 | ND |
| 2018-05-10 | E18004086006 | ND |
| 2019-07-16 | E20000191006 | ND |
| 2019-07-16 | E20000191008 | ND |