trans-1,2-Dichloroethylene
Dallas Water Utility
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 | 3 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 3 | 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 |
|---|---|---|
| 2018-07-17 | Q1828182010 | ND |
| 2018-08-07 | Q1831263001 | ND |
| 2018-08-07 | Q1831263004 | ND |
| 2019-07-08 | Q1942567001 | ND |
| 2019-07-16 | Q1945074005 | ND |
| 2019-07-16 | Q1945074007 | ND |
| 2020-07-20 | Q2028149001 | ND |
| 2020-08-31 | Q2034666001 | ND |
| 2020-08-31 | Q2034666003 | ND |
| 2021-07-26 | Q2119506001 | ND |
| 2021-08-12 | Q2121683006 | ND |
| 2021-08-12 | Q2121683008 | ND |
| 2022-09-23 | Q2228911001 | ND |
| 2022-10-27 | Q2232605001 | ND |
| 2022-10-27 | Q2232605003 | ND |
| 2023-08-01 | Q2331169008 | ND |
| 2023-08-01 | Q2331169010 | ND |
| 2023-08-01 | Q2331169012 | ND |