trans-1,2-Dichloroethylene
Rothschild 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 | ND | 5 | 0 | ND |
| 2019 | ND | 5 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2018-03-13 | 1044837 | ND |
| 2018-06-19 | 1062274 | ND |
| 2018-06-19 | 1062272 | ND |
| 2018-09-11 | 1079505 | ND |
| 2018-11-13 | 1092763 | ND |
| 2019-04-23 | 1116903 | ND |
| 2019-05-07 | 1119529 | ND |
| 2019-08-27 | 1144005 | ND |
| 2019-08-27 | 1144003 | ND |
| 2019-10-29 | 1157914 | ND |
| 2020-08-10 | 1205736 | ND |
| 2020-08-10 | 1205729 | ND |
| 2021-08-03 | 1269115 | ND |
| 2022-07-19 | 1324684 | ND |
| 2023-05-22 | CB05354-03 | ND |
| 2023-08-28 | CB10306-02 | ND |