trans-1,2-Dichloroethylene
Missouri American St. Louis County & St. Charles County
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 10 | 0 | ND |
| 2015 | ND | 5 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | ND | 5 | 0 | ND |
| 2018 | ND | 5 | 0 | ND |
| 2019 | ND | 5 | 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 |
|---|---|---|
| 2014-07-23 | AC30072 | ND |
| 2014-07-23 | 26417501 | ND |
| 2014-07-23 | AC30070 | ND |
| 2014-07-23 | AC30069 | ND |
| 2014-07-23 | AC30068 | ND |
| 2014-07-23 | AC30071 | ND |
| 2014-07-23 | 26417901 | ND |
| 2014-07-23 | 26417801 | ND |
| 2014-07-23 | 26417701 | ND |
| 2014-07-23 | 26417601 | ND |
| 2015-07-13 | 29463601 | ND |
| 2015-07-13 | 29464501 | ND |
| 2015-07-13 | 29951401 | ND |
| 2015-07-16 | 29462701 | ND |
| 2015-07-16 | 29461901 | ND |
| 2016-07-06 | 32598501 | ND |
| 2016-07-06 | 32599501 | ND |
| 2016-07-06 | 32599201 | ND |
| 2016-07-06 | 32596801 | ND |
| 2016-07-06 | 32597601 | ND |
| 2017-07-04 | 36143801 | ND |
| 2017-07-04 | 36144401 | ND |
| 2017-07-04 | 36144701 | ND |
| 2017-07-14 | 36143001 | ND |
| 2017-07-14 | 36142301 | ND |
| 2018-07-17 | 40295301 | ND |
| 2018-07-17 | 40297001 | ND |
| 2018-07-17 | 40296701 | ND |
| 2018-07-17 | 40296101 | ND |
| 2018-07-17 | 40294601 | ND |
| 2019-07-10 | 45230301 | ND |
| 2019-07-10 | 45231101 | ND |
| 2019-07-10 | 45232001 | ND |
| 2019-07-10 | 45234101 | ND |
| 2019-07-10 | 45234201 | ND |