trans-1,2-Dichloroethylene
City of Alto
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 | 2 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 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 |
|---|---|---|
| 2018-05-29 | Q1821302006 | ND |
| 2018-12-11 | Q1850897004 | ND |
| 2019-03-20 | Q1911720002 | ND |
| 2019-03-29 | Q1912916002 | ND |
| 2019-05-20 | Q1927027002 | ND |
| 2020-10-22 | Q2041198001 | ND |
| 2020-10-22 | Q2041198003 | ND |
| 2021-10-14 | Q2128845006 | ND |
| 2021-10-14 | Q2128845008 | ND |
| 2022-03-03 | Q2207391003 | ND |
| 2022-03-03 | Q2207391005 | ND |
| 2023-04-20 | Q2314880004 | ND |
| 2023-04-20 | Q2314880006 | ND |