trans-1,2-Dichloroethylene
Lehigh County Authority Allentown 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 | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 4 | 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 |
|---|---|---|
| 2018-03-13 | 8023741-01 | ND |
| 2018-03-13 | 8023741-02 | ND |
| 2019-03-19 | 9024667-02 | ND |
| 2019-03-19 | 9024667-01 | ND |
| 2020-03-04 | 21896278.00 | ND |
| 2020-03-11 | 21896287.00 | ND |
| 2020-03-18 | 21896301.00 | ND |
| 2020-03-18 | 21896311.00 | ND |
| 2021-01-06 | 23762415.00 | ND |
| 2021-01-13 | 23762438.00 | ND |
| 2021-01-20 | 23762461.00 | ND |
| 2021-01-20 | 23762484.00 | ND |
| 2022-01-10 | 25992205.00 | ND |
| 2022-01-19 | 25992226.00 | ND |
| 2022-01-25 | 25992249.00 | ND |
| 2022-01-25 | 25992270.00 | ND |
| 2023-01-04 | 28221625.00 | ND |
| 2023-01-09 | 28221648.00 | ND |
| 2023-01-18 | 28221671.00 | ND |
| 2023-01-18 | 28221694.00 | ND |
| 2023-02-22 | 28396014.00 | ND |