trans-1,2-Dichloroethylene
Hemlock Mutual Water Company
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 | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2018-09-06 | CA1910053_001_001-201809060910 | ND |
| 2018-09-06 | CA1910053_002_002-201809060850 | ND |
| 2019-09-09 | CA1910053_002_002-201909091025 | ND |
| 2019-09-09 | CA1910053_001_001-201909091030 | ND |
| 2020-09-02 | CA1910053_001_001-202009020820 | ND |
| 2020-09-02 | CA1910053_002_002-202009020805 | ND |
| 2021-07-07 | CA1910053_001_001-202107071110 | ND |
| 2021-07-07 | CA1910053_002_002-202107071100 | ND |
| 2022-07-07 | CA1910053_001_001-202207071105 | ND |
| 2022-07-07 | CA1910053_002_002-202207071045 | ND |
| 2023-07-21 | CA1910053_001_001-202307211000 | ND |
| 2023-07-21 | CA1910053_002_002-202307210945 | ND |