trans-1,2-Dichloroethylene
Marble Community Water System
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 | N/A | 0 | 0 | N/A |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2018-03-19 | 92377444001VOC | ND |
| 2020-03-16 | 92469616001_12710 | ND |
| 2021-03-29 | 92530231001A_12710 | ND |
| 2021-06-15 | 92544634001_12710 | ND |
| 2021-08-11 | 92555441001_12710 | ND |
| 2021-10-19 | 92567887001_12710 | ND |
| 2022-02-09 | 92587505001_12710 | ND |
| 2022-05-11 | 92604135001_12710 | ND |
| 2022-09-12 | 2093908-01 | ND |
| 2023-07-10 | 37729_23-36797 | ND |
| 2023-07-10 | 37729_23-36799 | ND |