trans-1,2-Dichloroethylene
Bcwsa New Hope
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 | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | 0.450 ppb | 2 | 1 | ND - 0.900 ppb |
| 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 |
|---|---|---|
| 2018-05-10 | 8043140-02 | ND |
| 2018-05-10 | 8043140-03 | ND |
| 2019-03-27 | 9002935-01 | ND |
| 2019-03-27 | 9002936-01 | ND |
| 2020-03-09 | 21833913.00 | ND |
| 2020-03-09 | 21833937.00 | ND |
| 2020-11-17 | 23350017.00 | ND |
| 2021-03-08 | 24046652.00 | ND |
| 2021-03-08 | 24046601.00 | ND |
| 2022-03-14 | 26275785.00 | ND |
| 2022-03-18 | 26275612.00 | 0.900 ppb |
| 2023-03-13 | 28688359.00 | ND |
| 2023-05-08 | 28885892.00 | ND |
| 2023-07-28 | 29289284.00 | ND |