trans-1,2-Dichloroethylene
City of Lancaster
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 | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2018-04-23 | 1810508-01 | ND |
| 2018-04-23 | 1810508-02 | ND |
| 2019-01-31 | 3013972001 | ND |
| 2019-01-31 | 3013972003 | ND |
| 2020-04-30 | 22169833.00 | ND |
| 2020-04-30 | 22169854.00 | ND |
| 2021-05-13 | 24591317.00 | ND |
| 2021-05-13 | 24591338.00 | ND |
| 2022-05-12 | 26798830.00 | ND |
| 2022-05-12 | 26798851.00 | ND |
| 2023-05-04 | 29057591.00 | ND |
| 2023-05-04 | 29057592.00 | ND |