trans-1,2-Dichloroethylene
City Of South Shore Water Works
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 | 1 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 1 | 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 |
|---|---|---|
| 2018-03-27 | 8033410-01 | ND |
| 2018-05-09 | 8051920-01 | ND |
| 2018-08-01 | 8110005-01 | ND |
| 2018-11-28 | 8110423-01 | ND |
| 2019-03-27 | 9030723-01 | ND |
| 2019-05-29 | 9050275-01 | ND |
| 2019-08-14 | 9080489-01 | ND |
| 2019-11-06 | 9110610-01 | ND |
| 2020-10-28 | 0100626-01 | ND |
| 2021-11-10 | 1101076-01RE1 | ND |
| 2022-11-02 | 2101004-01 | ND |
| 2023-07-12 | 3073438-01 | ND |