trans-1,2-Dichloroethylene
Why Domestic Water Improvement 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 | 2 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 3 | 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 |
|---|---|---|
| 2014-08-24 | 4082050-01 | ND |
| 2014-12-13 | 201412160007V | ND |
| 2015-08-07 | 5080660-02 | ND |
| 2015-12-06 | 201512070066V | ND |
| 2016-08-21 | 6081997-03 | ND |
| 2016-11-28 | 201611290384V | ND |
| 2017-08-04 | 7080560-03 | ND |
| 2017-10-11 | 7101229-03 | ND |
| 2017-10-23 | 201710240230V | ND |
| 2018-01-08 | 18A0856-03 | ND |
| 2018-10-23 | 201810250108V | ND |
| 2019-08-08 | 550-127715-1 | ND |
| 2019-09-26 | 201909270020V | ND |