trans-1,2-Dichloroethylene
Connecticut Water Company - Hebron Center Division
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 | 1 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 4 | 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 |
|---|---|---|
| 2018-04-09 | CA16134VOC1 | ND |
| 2019-02-11 | VOC1 200521212 | ND |
| 2020-09-21 | VOC1 200591010 | ND |
| 2021-08-31 | 300048791 300048800 | ND |
| 2021-10-25 | V300088205 300088206 | ND |
| 2022-01-13 | CK16254 | ND |
| 2022-04-21 | CL13693 | ND |
| 2022-07-07 | CL72297 | ND |
| 2022-10-18 | CM65668 | ND |
| 2023-01-12 | CN22972 | ND |
| 2023-04-17 | CN85298 | ND |
| 2023-08-15 | CO75345 | ND |
| 2023-10-17 | CP28039 | ND |
| 2023-10-24 | CP33075 | ND |