trans-1,2-Dichloroethylene
B C Y Water Supply Corporation
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 | 4 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 6 | 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 |
|---|---|---|
| 2018-06-21 | Q1824846011 | ND |
| 2018-06-21 | Q1824846013 | ND |
| 2018-06-21 | Q1824846016 | ND |
| 2018-06-21 | Q1824846005 | ND |
| 2019-03-13 | Q1910550001 | ND |
| 2019-03-13 | Q1910550005 | ND |
| 2019-03-13 | Q1910550010 | ND |
| 2019-03-13 | Q1910550014 | ND |
| 2020-02-10 | Q2005314011 | ND |
| 2020-02-10 | Q2005314013 | ND |
| 2020-02-10 | Q2005314015 | ND |
| 2020-03-02 | Q2007756011 | ND |
| 2021-09-21 | Q2125818005 | ND |
| 2021-09-21 | Q2125818011 | ND |
| 2021-09-21 | Q2125818007 | ND |
| 2021-09-21 | Q2125818003 | ND |
| 2022-10-27 | Q2232551010 | ND |
| 2022-10-27 | Q2232551012 | ND |
| 2022-10-27 | Q2232551014 | ND |
| 2022-10-27 | Q2232551016 | ND |
| 2023-01-10 | Q2301214003 | ND |
| 2023-01-10 | Q2301214005 | ND |
| 2023-05-01 | Q2316259005 | ND |
| 2023-05-01 | Q2316259007 | ND |
| 2023-05-01 | Q2316259009 | ND |
| 2023-11-13 | Q2348410003 | ND |