trans-1,2-Dichloroethylene
City of The Dalles
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 | 1 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 4 | 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 |
|---|---|---|
| 2018-08-16 | V8H038102-V | ND |
| 2018-08-16 | V8H038101-V | ND |
| 2018-08-16 | V8H038103-V | ND |
| 2019-08-14 | B9H225803-V | ND |
| 2020-08-11 | VDH027501-V | ND |
| 2021-08-18 | 202108190352-V | ND |
| 2021-08-18 | 202108190360-V | ND |
| 2021-08-18 | 202108190359-V | ND |
| 2021-08-18 | 202108190351-V | ND |
| 2022-09-07 | 810-36663-3-V | ND |
| 2022-09-07 | 810-36663-1-V | ND |
| 2022-09-07 | 810-36663-4-V | ND |
| 2022-09-07 | 810-36663-2-V | ND |
| 2023-08-02 | VGH0111-04-V | ND |
| 2023-08-02 | VGH0111-03-V | ND |
| 2023-08-02 | VGH0111-02-V | ND |
| 2023-08-02 | VGH0111-01-V | ND |