trans-1,2-Dichloroethylene
Concan Water Supply 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 | ND | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 4 | 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 |
|---|---|---|
| 2018-01-25 | AE10558 | ND |
| 2018-04-16 | AE22551 | ND |
| 2018-08-09 | AE36398 | ND |
| 2018-12-13 | AE48838 | ND |
| 2019-02-28 | AE56584 | ND |
| 2019-02-28 | AE56588 | ND |
| 2019-02-28 | AE56592 | ND |
| 2019-08-26 | AE80657 | ND |
| 2020-08-12 | AF23217 | ND |
| 2020-08-12 | AF23219 | ND |
| 2020-08-12 | AF23221 | ND |
| 2020-08-12 | AF23223 | ND |
| 2021-05-19 | AF54642 | ND |
| 2021-05-19 | AF54644 | ND |
| 2021-09-22 | AF70823 | ND |
| 2021-09-22 | AF70825 | ND |
| 2022-03-08 | AF88082 | ND |
| 2022-08-16 | AG09478 | ND |
| 2022-08-16 | AG09480 | ND |
| 2022-08-16 | AG09482 | ND |
| 2023-08-24 | AG54024 | ND |
| 2023-11-06 | AG62379 | ND |
| 2023-11-06 | AG62381 | ND |
| 2023-11-06 | AG62383 | ND |