trans-1,2-Dichloroethylene
Quint-mar Water Authority
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 | N/A | 0 | 0 | N/A |
| 2016 | ND | 6 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 9 | 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 |
|---|---|---|
| 2014-02-12 | AA88470 | ND |
| 2014-02-13 | AA88469 | ND |
| 2016-06-14 | AB12489 | ND |
| 2016-06-14 | AB12487 | ND |
| 2016-06-14 | AB12491 | ND |
| 2016-06-14 | AB12490 | ND |
| 2016-06-14 | AB12486 | ND |
| 2016-06-14 | AB12488 | ND |
| 2017-01-26 | AB17481 | ND |
| 2017-01-26 | AB17480 | ND |
| 2019-02-05 | AB32812 | ND |
| 2019-02-05 | AB32813 | ND |
| 2019-02-05 | AB32818 | ND |
| 2019-02-05 | AB32817 | ND |
| 2019-02-05 | AB32816 | ND |
| 2019-02-05 | AB32815 | ND |
| 2019-02-05 | AB32814 | ND |
| 2019-04-17 | AB34290 | ND |
| 2019-04-17 | AB34289 | ND |