trans-1,2-Dichloroethylene
Chesterfield County Central Water System
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 | 10 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2014-03-27 | E140307385 | ND |
| 2014-04-22 | E140308606 | ND |
| 2014-04-22 | E140308595 | ND |
| 2014-04-22 | E140308573 | ND |
| 2014-04-22 | E140308605 | ND |
| 2014-08-22 | E140801008 | ND |
| 2014-08-22 | E140801006 | ND |
| 2014-08-22 | E140801005 | ND |
| 2014-08-22 | E140801007 | ND |
| 2014-09-25 | E140801009 | ND |
| 2015-04-23 | VA010-DCLS | ND |
| 2015-04-23 | VA010-DCLS | ND |
| 2015-04-23 | VA010-DCLS | ND |
| 2015-04-23 | VA010-DCLS | ND |
| 2016-04-25 | E160305672 | ND |
| 2016-04-25 | E160305675 | ND |
| 2016-04-25 | E160305671 | ND |
| 2016-04-25 | E160305682 | ND |
| 2017-04-19 | E170304726 | ND |
| 2017-04-19 | E170304724 | ND |
| 2017-04-19 | E170304741 | ND |
| 2017-04-20 | E170304722 | ND |
| 2018-06-13 | E180403018 | ND |
| 2018-06-13 | E180403021 | ND |
| 2018-06-13 | E180403026 | ND |
| 2018-06-13 | E180403037 | ND |
| 2019-05-16 | E190402830 | ND |
| 2019-05-16 | E190402834 | ND |
| 2019-05-16 | E190402839 | ND |
| 2019-05-16 | E190402846 | ND |