trans-1,2-Dichloroethylene
West Point, City of
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 | 3 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 5 | 0 | ND |
| 2023 | 0.0638 ppb | 8 | 1 | ND - 0.510 ppb |
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 |
|---|---|---|
| 2018-01-16 | 530842 | ND |
| 2018-09-24 | 571941 | ND |
| 2018-09-24 | 571940 | ND |
| 2019-01-14 | 592531 | ND |
| 2019-09-03 | 630428 | ND |
| 2019-09-03 | 630429 | ND |
| 2020-02-10 | 650614 | ND |
| 2020-09-14 | 689975 | ND |
| 2020-09-14 | 689974 | ND |
| 2021-01-19 | 713005 | ND |
| 2021-09-21 | 764409 | ND |
| 2021-09-21 | 764408 | ND |
| 2022-01-18 | 778908 | ND |
| 2022-09-12 | 822877 | ND |
| 2022-09-12 | 822878 | ND |
| 2022-12-05 | 835790 | ND |
| 2022-12-05 | 835789 | ND |
| 2023-03-06 | 851386 | ND |
| 2023-03-06 | 851387 | ND |
| 2023-06-19 | 864105 | 0.510 ppb |
| 2023-06-19 | 864104 | ND |
| 2023-09-06 | 879906 | ND |
| 2023-09-06 | 879907 | ND |
| 2023-12-05 | 891492 | ND |
| 2023-12-05 | 891491 | ND |