trans-1,2-Dichloroethylene
Timber Lane Utility District
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 |
|---|---|---|---|---|
| 2014 | ND | 3 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
|---|---|---|
| 2014-03-18 | AC47374 | ND |
| 2014-03-18 | AC47368 | ND |
| 2014-03-18 | AC47378 | ND |
| 2015-01-29 | AC78517 | ND |
| 2015-01-29 | AC78523 | ND |
| 2015-01-29 | AC78525 | ND |
| 2015-01-29 | AC78529 | ND |
| 2016-02-11 | AD23385 | ND |
| 2016-02-11 | AD23383 | ND |
| 2016-02-11 | AD23401 | ND |
| 2017-02-09 | AD69994 | ND |
| 2017-05-01 | AD81866 | ND |
| 2017-05-01 | AD81850 | ND |
| 2018-01-24 | AE10596 | ND |
| 2018-01-24 | AE10616 | ND |
| 2018-01-24 | AE10606 | ND |
| 2018-01-24 | AE10600 | ND |
| 2019-01-17 | AE50408 | ND |
| 2019-01-17 | AE50404 | ND |
| 2019-01-17 | AE50400 | ND |