trans-1,2-Dichloroethylene
Marilee Elmont
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 | 3 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 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 |
|---|---|---|
| 2018-03-06 | Q1809285012 | ND |
| 2018-03-06 | Q1809285004 | ND |
| 2018-12-11 | Q1850963001 | ND |
| 2019-03-28 | Q1912690003 | ND |
| 2019-03-28 | Q1912690005 | ND |
| 2019-10-23 | Q1973423001 | ND |
| 2020-10-15 | Q2040500001 | ND |
| 2020-10-15 | Q2040500003 | ND |
| 2020-10-15 | Q2040500005 | ND |
| 2021-10-13 | Q2128658007 | ND |
| 2021-10-13 | Q2128658011 | ND |
| 2021-10-13 | Q2128658009 | ND |
| 2022-06-15 | Q2216689004 | ND |
| 2022-06-15 | Q2216689006 | ND |
| 2022-06-15 | Q2216689008 | ND |
| 2023-08-14 | Q2333684003 | ND |
| 2023-08-14 | Q2333684005 | ND |
| 2023-10-31 | Q2346561001 | ND |