trans-1,2-Dichloroethylene
Alameda County Water District
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 | 5 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2014-05-27 | 9590-015-1020 | ND |
| 2014-07-21 | 9590-041-0955 | ND |
| 2014-07-21 | 9590-038-0955 | ND |
| 2014-07-22 | 9590-053-0905 | ND |
| 2014-07-22 | 9590-040-0925 | ND |
| 2015-07-06 | 9590-038-1000 | ND |
| 2015-07-06 | 9590-040-1105 | ND |
| 2015-07-06 | 9590-041-0921 | ND |
| 2015-07-21 | 9590-053-0905 | ND |
| 2016-07-21 | 9590-038-0915 | ND |
| 2016-07-21 | 9590-053-0940 | ND |
| 2016-07-21 | 9590-041-0905 | ND |
| 2016-07-21 | 9590-040-0825 | ND |
| 2017-07-17 | 9590-041-1005 | ND |
| 2017-07-17 | 9590-038-1030 | ND |
| 2017-07-25 | 9590-053-1032 | ND |
| 2017-07-25 | 9590-040-0915 | ND |
| 2018-07-11 | 9590-041-0755 | ND |
| 2018-07-11 | 9590-038-0726 | ND |
| 2018-07-17 | 9590-040-0850 | ND |
| 2018-07-17 | 9590-053-0845 | ND |
| 2019-04-16 | 9590-038-0800 | ND |
| 2019-04-23 | 9590-053-0745 | ND |
| 2019-04-30 | 9590-041-0905 | ND |
| 2019-06-04 | 9590-040-0815 | ND |