trans-1,2-Dichloroethylene
Washington Aqueduct Division.
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 | 2 | 0 | ND |
| 2016 | ND | 8 | 0 | ND |
| 2017 | ND | 6 | 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 |
|---|---|---|
| 2015-10-14 | 12344 | ND |
| 2015-10-14 | 12345 | ND |
| 2016-01-13 | 201601-18 | ND |
| 2016-01-13 | 201601-J | ND |
| 2016-04-13 | 201604-18 | ND |
| 2016-04-13 | 201604-J | ND |
| 2016-07-13 | 201607-18 | ND |
| 2016-07-13 | 201607-J | ND |
| 2016-10-12 | 201610-18 | ND |
| 2016-10-12 | 201610-J | ND |
| 2017-01-11 | 201701-18 | ND |
| 2017-01-11 | 201701-J | ND |
| 2017-04-12 | 201704-18 | ND |
| 2017-04-12 | 201704-J | ND |
| 2017-07-12 | 201707-18 | ND |
| 2017-07-12 | 201707-J | ND |