trans-1,2-Dichloroethylene
Spring Park
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 | 6 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 5 | 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 |
|---|---|---|
| 2018-02-27 | 18B1222-01 | ND |
| 2018-04-26 | 18D1558-01 | ND |
| 2018-11-13 | 18K0569-01 | ND |
| 2018-12-18 | 18L0646-01 | ND |
| 2019-01-29 | 19A0922-01 | ND |
| 2019-02-19 | 19B0810-01 | ND |
| 2019-03-22 | 19C0967-01 | ND |
| 2019-05-10 | 19E0822-01 | ND |
| 2019-10-01 | 19J0043-01 | ND |
| 2019-11-05 | 19K0180-01 | ND |
| 2020-01-07 | 20A0112-01 | ND |
| 2020-06-03 | 20F0243-01 | ND |
| 2020-08-04 | 20H0088-01 | ND |
| 2021-04-28 | 21D1668-01 | ND |
| 2021-11-04 | 21K0345-01 | ND |
| 2022-06-16 | 22F1024-01 | ND |
| 2022-07-18 | 22G1075-01 | ND |
| 2022-11-18 | 22K0868-01 | ND |
| 2023-02-28 | 23C0047-01 | ND |
| 2023-02-28 | 23C0047-03 | ND |
| 2023-05-01 | 23E0055-01 | ND |
| 2023-08-22 | 23H2301-01 | ND |
| 2023-10-20 | 23J1098-01 | ND |