trans-1,2-Dichloroethylene
San Jacinto Special Utility District
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 | 3 | 0 | ND |
| 2019 | ND | 6 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 3 | 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 |
|---|---|---|
| 2018-03-12 | AE17846 | ND |
| 2018-03-12 | AE17880 | ND |
| 2018-03-12 | AE17838 | ND |
| 2019-03-13 | AE58223 | ND |
| 2019-03-13 | AE58225 | ND |
| 2019-03-13 | AE58227 | ND |
| 2019-06-06 | AE69493 | ND |
| 2019-08-01 | AE76824 | ND |
| 2019-12-05 | AE91443 | ND |
| 2020-01-22 | AE94690 | ND |
| 2020-03-10 | AF01991 | ND |
| 2020-03-10 | AF01997 | ND |
| 2021-01-11 | AF38521 | ND |
| 2021-01-11 | AF38523 | ND |
| 2021-03-08 | AF45724 | ND |
| 2022-01-24 | AF81297 | ND |
| 2022-05-02 | AF95080 | ND |
| 2022-05-02 | AF95082 | ND |
| 2023-03-14 | AG32973 | ND |
| 2023-03-14 | AG32981 | ND |
| 2023-06-08 | AG43780 | ND |