trans-1,2-Dichloroethylene
Jim Hogg County Water Control and Improvement District 2
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 | 1 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 5 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 3 | 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 |
|---|---|---|
| 2014-06-12 | AC56698 | ND |
| 2015-03-17 | AC84707 | ND |
| 2016-02-18 | AD24333 | ND |
| 2017-02-23 | AD71751 | ND |
| 2017-06-06 | AD86663 | ND |
| 2017-06-06 | AD86661 | ND |
| 2017-09-06 | AD94943 | ND |
| 2017-12-06 | AE06992 | ND |
| 2018-03-08 | AE17537 | ND |
| 2018-03-08 | AE17543 | ND |
| 2019-03-05 | AE57134 | ND |
| 2019-03-05 | AE57140 | ND |
| 2019-03-05 | AE57152 | ND |