trans-1,2-Dichloroethylene
City of Goldthwaite
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 | ND | 2 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 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 |
|---|---|---|
| 2018-01-18 | AE09291 | ND |
| 2019-02-28 | AE56600 | ND |
| 2019-11-20 | AE89966 | ND |
| 2020-01-16 | AE93972 | ND |
| 2020-01-16 | AE93974 | ND |
| 2020-05-04 | AF09149 | ND |
| 2020-07-07 | AF18228 | ND |
| 2021-03-01 | AF44650 | ND |
| 2021-04-12 | AF49813 | ND |
| 2022-01-27 | AF82252 | ND |
| 2022-04-14 | AF93358 | ND |
| 2023-01-11 | AG24071 | ND |