trans-1,2-Dichloroethylene
Silverton, City of
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 | 2 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 2 | 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 |
|---|---|---|
| 2014-02-26 | 20140226036-V | ND |
| 2014-03-19 | 20140319043-V | ND |
| 2015-02-24 | 20150224006-V | ND |
| 2015-12-14 | 20151214022-V | ND |
| 2016-04-12 | 20160412036-V | ND |
| 2016-10-17 | 20161017042-V | ND |
| 2017-01-23 | 20170123023-V | ND |
| 2017-05-02 | 20170502019-V | ND |
| 2018-11-26 | 20181126046-V | ND |
| 2018-12-03 | 20181203030-V | ND |
| 2019-09-24 | 20190924031-V | ND |
| 2019-12-16 | 20191216023-V | ND |