trans-1,2-Dichloroethylene
Carlsbad Municipal Water System
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 | 3 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 5 | 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 |
|---|---|---|
| 2014-01-15 | 1401736-001A | ND |
| 2014-06-24 | 1406C71-001A | ND |
| 2014-06-24 | 1406C70-001A | ND |
| 2016-02-09 | 1602465-001A | ND |
| 2016-04-12 | 1604620-001A | ND |
| 2017-06-05 | 2017016707 | ND |
| 2017-06-05 | 2017016705 | ND |
| 2017-06-05 | 2017016706 | ND |
| 2018-04-23 | 2018011506 | ND |
| 2018-06-04 | 1806144-001 | ND |
| 2018-07-09 | 2018018947 | ND |
| 2018-09-10 | 1809604-001 | ND |
| 2018-10-01 | 2018028326 | ND |
| 2019-02-11 | 2019003803 | ND |
| 2019-02-11 | 2019003804 | ND |