trans-1,2-Dichloroethylene
West Harris County Municipal Utility District 15
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 |
|---|---|---|---|---|
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 |
|---|---|---|
| 2018-03-05 | AE16632 | ND |
| 2018-03-05 | AE16636 | ND |
| 2019-01-28 | AE51688 | ND |
| 2019-04-23 | AE63390 | ND |
| 2020-01-13 | AE93133 | ND |
| 2020-11-05 | AF33470 | ND |
| 2021-03-09 | AF46042 | ND |
| 2021-04-27 | AF51428 | ND |
| 2022-03-01 | AF86930 | ND |
| 2022-03-01 | AF86950 | ND |
| 2023-02-22 | AG29960 | ND |
| 2023-02-22 | AG29962 | ND |