trans-1,2-Dichloroethylene
City of League City
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 | 4 | 0 | ND |
| 2015 | ND | 9 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 5 | 0 | ND |
| 2019 | ND | 8 | 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 |
|---|---|---|
| 2014-04-30 | AC52354 | ND |
| 2014-04-30 | AC52356 | ND |
| 2014-08-19 | AC64318 | ND |
| 2014-12-15 | AC75122 | ND |
| 2015-01-29 | AC78507 | ND |
| 2015-01-29 | AC78501 | ND |
| 2015-03-30 | AC86539 | ND |
| 2015-03-30 | AC86557 | ND |
| 2015-06-16 | AC96198 | ND |
| 2015-06-16 | AC96204 | ND |
| 2015-06-16 | AC96202 | ND |
| 2015-08-05 | AD02635 | ND |
| 2015-10-21 | AD11338 | ND |
| 2016-01-28 | AD20760 | ND |
| 2016-01-28 | AD20756 | ND |
| 2016-01-28 | AD20758 | ND |
| 2016-01-28 | AD20754 | ND |
| 2017-01-31 | AD67890 | ND |
| 2017-05-02 | AD82176 | ND |
| 2017-05-02 | AD82194 | ND |
| 2017-09-19 | AD96842 | ND |
| 2018-01-29 | AE11008 | ND |
| 2018-01-29 | AE11010 | ND |
| 2018-01-29 | AE11004 | ND |
| 2018-03-23 | AE19936 | ND |
| 2018-12-06 | AE48210 | ND |
| 2019-01-23 | AE50967 | ND |
| 2019-01-23 | AE50959 | ND |
| 2019-01-23 | AE50969 | ND |
| 2019-04-10 | AE61814 | ND |
| 2019-07-16 | AE74662 | ND |
| 2019-07-16 | AE74658 | ND |
| 2019-10-15 | AE86663 | ND |
| 2019-10-15 | AE86665 | ND |