trans-1,2-Dichloroethylene
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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 | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 4 | 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 |
|---|---|---|
| 2018-02-28 | 2299258001 | ND |
| 2018-04-04 | 1808553-01 | ND |
| 2018-09-19 | 8028476-01 | ND |
| 2018-10-01 | 2342083001 | ND |
| 2019-02-20 | 9023911-01 | ND |
| 2019-06-19 | 9064195-01 | ND |
| 2019-08-06 | 9083192-01 | ND |
| 2019-10-16 | 3064279001 | ND |
| 2020-02-24 | 21661902.00 | ND |
| 2020-04-01 | 21841320.00 | ND |
| 2020-07-15 | 22601866.00 | ND |
| 2020-12-23 | 23531961.00 | ND |
| 2021-01-21 | 23707016.00 | ND |
| 2021-04-08 | 24054514.00 | ND |
| 2021-07-20 | 24822889.00 | ND |
| 2021-10-15 | 25399207.00 | ND |
| 2022-01-21 | 25936805.00 | ND |
| 2022-04-15 | 26458549.00 | ND |
| 2022-07-15 | 27031507.00 | ND |
| 2022-10-28 | 27636338.00 | ND |
| 2023-01-27 | 28344315.00 | ND |
| 2023-04-21 | 28696423.00 | ND |
| 2023-07-21 | 29296494.00 | ND |
| 2023-10-20 | 29881309.00 | ND |