trans-1,2-Dichloroethylene
New 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 | 4 | 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 |
|---|---|---|
| 2018-06-06 | Q1822507003 | ND |
| 2018-06-06 | Q1822507005 | ND |
| 2018-06-06 | Q1822507001 | ND |
| 2018-09-19 | Q1837597003 | ND |
| 2019-06-03 | Q1930848003 | ND |
| 2019-06-03 | Q1930848005 | ND |
| 2019-09-23 | Q1968123001 | ND |
| 2019-12-10 | Q1979549001 | ND |
| 2020-11-09 | Q2043745001 | ND |
| 2020-11-09 | Q2043745003 | ND |
| 2020-11-09 | Q2043745007 | ND |
| 2020-11-09 | Q2043745009 | ND |
| 2021-04-15 | Q2109763009 | ND |
| 2021-04-15 | Q2109763015 | ND |
| 2021-04-15 | Q2109763013 | ND |
| 2021-04-15 | Q2109763011 | ND |
| 2022-05-09 | Q2213779004 | ND |
| 2022-05-09 | Q2213779006 | ND |
| 2022-05-09 | Q2213779009 | ND |
| 2022-05-09 | Q2213779011 | ND |
| 2023-06-15 | Q2322767004 | ND |
| 2023-06-15 | Q2322767006 | ND |
| 2023-06-15 | Q2322767016 | ND |
| 2023-06-15 | Q2322767018 | ND |