trans-1,2-Dichloroethylene
Water Authority of Dickson County
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 | 15 | 0 | ND |
| 2022 | ND | 17 | 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 | Result |
|---|---|
| 2018-03-07 | ND |
| 2018-03-07 | ND |
| 2018-03-07 | ND |
| 2019-04-03 | ND |
| 2019-04-03 | ND |
| 2019-04-03 | ND |
| 2020-02-04 | ND |
| 2020-02-04 | ND |
| 2020-02-05 | ND |
| 2021-01-06 | ND |
| 2021-02-03 | ND |
| 2021-03-03 | ND |
| 2021-03-03 | ND |
| 2021-04-07 | ND |
| 2021-04-07 | ND |
| 2021-04-07 | ND |
| 2021-05-05 | ND |
| 2021-06-22 | ND |
| 2021-07-07 | ND |
| 2021-08-03 | ND |
| 2021-09-09 | ND |
| 2021-10-06 | ND |
| 2021-11-03 | ND |
| 2021-12-08 | ND |
| 2022-01-05 | ND |
| 2022-01-05 | ND |
| 2022-02-02 | ND |
| 2022-02-02 | ND |
| 2022-02-09 | ND |
| 2022-02-09 | ND |
| 2022-02-09 | ND |
| 2022-02-09 | ND |
| 2022-02-09 | ND |
| 2022-02-09 | ND |
| 2022-03-02 | ND |
| 2022-03-02 | ND |
| 2022-04-06 | ND |
| 2022-05-11 | ND |
| 2022-06-08 | ND |
| 2022-07-06 | ND |
| 2022-08-03 | ND |
| 2023-04-12 | ND |
| 2023-04-12 | ND |
| 2023-04-12 | ND |