trans-1,2-Dichloroethylene
Twin Lakes Water Works Corporation
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 | N/A | 0 | 0 | N/A |
| 2020 | ND | 5 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 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 |
|---|---|---|
| 2020-05-12 | CF93587-POCS | ND |
| 2020-05-12 | CF93588-POCS | ND |
| 2020-06-02 | AW10202-POCS | ND |
| 2020-06-02 | AW10200-POCS | ND |
| 2020-10-14 | AW19900-POCS | ND |
| 2021-06-09 | AX11166-POCS | ND |
| 2021-06-09 | AX11168-POCS | ND |
| 2021-10-06 | AX20390-POCS | ND |
| 2022-06-07 | AY09590-POCS | ND |
| 2022-06-07 | AY09592-POCS | ND |
| 2022-10-04 | AY17875-POCS | ND |
| 2023-05-10 | AZ08444-POCS-1 | ND |
| 2023-05-10 | AZ08442-POCS | ND |
| 2023-11-19 | CP51319-POCS | ND |
| 2023-11-19 | CP51318-POCS | ND |
| 2023-12-13 | AZ22568-POCS | ND |