trans-1,2-Dichloroethylene
Lake Delton Waterworks
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 | N/A | 0 | 0 | N/A |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 7 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 5 | 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 |
|---|---|---|
| 2019-06-19 | 1129378 | ND |
| 2019-07-22 | 1135927 | ND |
| 2019-12-10 | 1164822 | ND |
| 2020-04-20 | 409868 | ND |
| 2020-05-28 | 424672 | ND |
| 2020-05-28 | 424675 | ND |
| 2020-05-28 | 424681 | ND |
| 2020-06-02 | 426799 | ND |
| 2020-06-02 | 426789 | ND |
| 2020-06-02 | 426786 | ND |
| 2021-01-20 | 526112 | ND |
| 2023-03-20 | 1301274 | ND |
| 2023-03-20 | 1301276 | ND |
| 2023-04-19 | 1316618 | ND |
| 2023-04-20 | 1316620 | ND |
| 2023-04-20 | 1316622 | ND |