trans-1,2-Dichloroethylene
Galveston County WCID 1
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 | ND | 3 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 3 | 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 |
|---|---|---|
| 2014-06-03 | AC55813 | ND |
| 2014-06-03 | AC55811 | ND |
| 2014-06-03 | AC55805 | ND |
| 2015-01-15 | AC76456 | ND |
| 2015-01-15 | AC76466 | ND |
| 2015-01-15 | AC76462 | ND |
| 2016-01-26 | AD20090 | ND |
| 2016-01-26 | AD20084 | ND |
| 2016-06-27 | AD41911 | ND |
| 2016-09-29 | AD52074 | ND |
| 2016-11-29 | AD59385 | ND |
| 2017-01-26 | AD67185 | ND |
| 2017-01-26 | AD67177 | ND |
| 2017-01-26 | AD67201 | ND |
| 2017-04-25 | AD81207 | ND |
| 2018-02-26 | AE15475 | ND |
| 2018-02-26 | AE15473 | ND |
| 2018-02-26 | AE15471 | ND |
| 2019-01-31 | AE52457 | ND |
| 2019-01-31 | AE52453 | ND |
| 2019-06-21 | AE71729 | ND |