trans-1,2-Dichloroethylene
Medford Water Commission
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 | 1 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 5 | 0 | ND |
| 2022 | ND | 4 | 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 |
|---|---|---|
| 2018-06-21 | 180691501A-V | ND |
| 2019-06-11 | 1906043601-V | ND |
| 2020-01-09 | 2001034901-V | ND |
| 2020-01-09 | 2001034902-V | ND |
| 2020-06-25 | 2006116401B-V | ND |
| 2021-01-28 | 2101107501-V | ND |
| 2021-01-28 | 2101107502-V | ND |
| 2021-01-28 | 2101107501C-V | ND |
| 2021-01-28 | 2101107502C-V | ND |
| 2021-06-01 | 2106003401 | ND |
| 2022-01-31 | 2201113102B-V | ND |
| 2022-01-31 | 2201113101B-V | ND |
| 2022-06-02 | 22060112-01-V | ND |
| 2022-06-02 | 22060112-01A-V | ND |
| 2023-01-27 | 23010989-01-V | ND |
| 2023-01-27 | 23010989-02-V | ND |
| 2023-06-15 | 23060760-01A-V | ND |