trans-1,2-Dichloroethylene
Swta - Main System
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 | 6 | 0 | ND |
| 2019 | ND | 5 | 0 | ND |
| 2020 | ND | 7 | 0 | ND |
| 2021 | ND | 5 | 0 | ND |
| 2022 | ND | 5 | 0 | ND |
| 2023 | ND | 7 | 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 |
|---|---|---|
| 2018-01-09 | 8012152-02 | ND |
| 2018-04-10 | 8042613-02 | ND |
| 2018-04-10 | 8042612-01 | ND |
| 2018-04-10 | 8042612-02 | ND |
| 2018-04-10 | 8042612-03 | ND |
| 2018-04-10 | 8042612-04 | ND |
| 2019-04-23 | 9044997-01 | ND |
| 2019-04-23 | 9044997-02 | ND |
| 2019-04-23 | 9044997-03 | ND |
| 2019-04-23 | 9044997-04 | ND |
| 2019-04-23 | 9044997-05 | ND |
| 2020-04-14 | 22080220.00 | ND |
| 2020-04-14 | 22080283.00 | ND |
| 2020-04-14 | 22080199.00 | ND |
| 2020-04-14 | 22080178.00 | ND |
| 2020-04-14 | 22080157.00 | ND |
| 2020-04-14 | 22080241.00 | ND |
| 2020-04-14 | 22080262.00 | ND |
| 2021-04-06 | 24301753.00 | ND |
| 2021-04-06 | 24301816.00 | ND |
| 2021-04-06 | 24301774.00 | ND |
| 2021-04-06 | 24301795.00 | ND |
| 2021-04-06 | 24301837.00 | ND |
| 2022-05-31 | 26899451.00 | ND |
| 2022-05-31 | 26899514.00 | ND |
| 2022-05-31 | 26899472.00 | ND |
| 2022-05-31 | 26899493.00 | ND |
| 2022-05-31 | 26899535.00 | ND |
| 2023-04-04 | 28761093.00 | ND |
| 2023-04-04 | 28761090.00 | ND |
| 2023-04-04 | 28761095.00 | ND |
| 2023-04-04 | 28761094.00 | ND |
| 2023-04-04 | 28761092.00 | ND |
| 2023-04-04 | 28761091.00 | ND |
| 2023-12-12 | 30296275.00 | ND |