trans-1,2-Dichloroethylene
Westbrook Estates
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 | 1 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 4 | 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 |
|---|---|---|
| 2018-10-09 | 18J0431-02 | ND |
| 2019-01-14 | 19A0414-01 | ND |
| 2020-01-13 | 20A0470-01 | ND |
| 2021-11-08 | 21K0563-01 | ND |
| 2022-01-10 | 22A0251-01 | ND |
| 2022-05-04 | 22E0324-01 | ND |
| 2022-07-14 | 22G0889-01 | ND |
| 2022-10-10 | 22J0358-01 | ND |
| 2023-02-08 | 23B0589-01 | ND |
| 2023-04-24 | 23D1397-01 | ND |
| 2023-07-11 | 23G0454-01 | ND |
| 2023-10-09 | 23J0436-01 | ND |