trans-1,2-Dichloroethylene
Queens Harbor/pier Point
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 | 2 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 5 | 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 |
|---|---|---|
| 2018-10-09 | 7149-100918-V01V | ND |
| 2019-04-16 | 7149-041619-V01V | ND |
| 2019-10-08 | 7149-100819-V01V | ND |
| 2020-10-27 | 7149-102720-V01V | ND |
| 2021-10-19 | 7149-101921-V01V | ND |
| 2022-01-12 | 7149-011222-V02V | ND |
| 2022-04-27 | 7149-042722-V02V | ND |
| 2022-07-12 | 7149-071222-V02V | ND |
| 2022-10-11 | 7149-101122-V01V | ND |
| 2022-10-11 | 7149-101122-V02V | ND |
| 2023-01-10 | 752-1051-1_A | ND |
| 2023-08-28 | 752-11002-1 | ND |
| 2023-10-04 | 752-12302-1 | ND |