trans-1,2-Dichloroethylene
Monticello Estates
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 | N/A | 0 | 0 | N/A |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 1 | 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 |
|---|---|---|
| 2019-05-02 | CC03132-01 | ND |
| 2019-07-31 | CC09246-01 | ND |
| 2019-10-14 | CC15162-01RE1 | ND |
| 2020-01-27 | CC20276-01 | ND |
| 2020-01-27 | CC20276-03 | ND |
| 2020-04-22 | CD02836-01 | ND |
| 2020-10-07 | CD14230-01 | ND |
| 2021-12-01 | CE14584-01 | ND |
| 2022-01-31 | CE19577-01 | ND |
| 2022-05-10 | CF03509-01 | ND |
| 2022-07-19 | CF09386-01 | ND |
| 2022-10-20 | CF13296-01 | ND |
| 2023-02-15 | 752-3181-1 | ND |
| 2023-05-16 | 752-7180-1 | ND |
| 2023-08-08 | 752-10330-1 | ND |
| 2023-11-28 | 752-14118-1 | ND |
| 2023-12-06 | 752-14483-1 | ND |