trans-1,2-Dichloroethylene
Castle Mountain Creeks Owners Association
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 | 1 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 1 | 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 |
|---|---|---|
| 2019-01-07 | V1900713 | ND |
| 2020-02-11 | V2006067 | ND |
| 2020-05-13 | V2021731 | ND |
| 2020-08-24 | V2041261 | ND |
| 2020-12-08 | V2061672 | ND |
| 2021-01-08 | V2101074 | ND |
| 2021-04-15 | V2117132 | ND |
| 2021-07-15 | V2135856 | ND |
| 2021-10-26 | V2157582 | ND |
| 2022-03-07 | V2210666 | ND |
| 2022-04-06 | V2216003 | ND |
| 2022-09-15 | V2246108 | ND |
| 2022-12-22 | V2262581 | ND |
| 2023-10-19 | V2322779-01 | ND |