trans-1,2-Dichloroethylene
Bristol Water Department
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 | 8 | 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 |
|---|---|---|
| 2018-01-10 | D8A0568-04VOC | ND |
| 2018-01-10 | D8A0568-03VOC | ND |
| 2018-01-10 | D8A0568-02VOC | ND |
| 2018-01-10 | D8A0568-01VOC | ND |
| 2019-10-28 | D9J2584-01VOC | ND |
| 2019-10-28 | D9J2584-04VOC | ND |
| 2019-10-28 | D9J2584-03VOC | ND |
| 2019-10-28 | D9J2584-02VOC | ND |
| 2020-11-19 | D0K1813-01VOC | ND |
| 2020-11-19 | D0K1813-02VOC | ND |
| 2020-11-19 | D0K1813-03VOC | ND |
| 2020-11-19 | D0K1813-04VOC | ND |
| 2021-08-12 | D1H1346-03VOC | ND |
| 2021-08-12 | D1H1346-04VOC | ND |
| 2021-08-12 | D1H1346-02VOC | ND |
| 2021-08-12 | D1H1346-01VOC | ND |
| 2022-11-21 | D2K1965-01VOC | ND |
| 2022-11-21 | D2K1965-04VOC | ND |
| 2022-11-21 | D2K1965-05VOC | ND |
| 2022-11-21 | D2K1965-02VOC | ND |
| 2022-11-21 | D2K1965-03VOC | ND |
| 2022-11-21 | D2K1965-06VOC | ND |
| 2022-11-28 | D2K2374-01VOC | ND |
| 2022-11-28 | D2K2374-02VOC | ND |
| 2023-03-06 | D3C0654-01VOC | ND |
| 2023-03-06 | D3C0654-02VOC | ND |
| 2023-03-06 | D3C0654-03VOC | ND |
| 2023-03-15 | D3C1373-01VOC | ND |