trans-1,2-Dichloroethylene
City of Waskom
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 5 | 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 |
|---|---|---|
| 2015-05-12 | Q1517315003 | ND |
| 2016-03-03 | Q1609178012 | ND |
| 2016-03-03 | Q1609178007 | ND |
| 2016-06-14 | Q1623922003 | ND |
| 2016-09-02 | Q1635698001 | ND |
| 2016-11-14 | Q1649298001 | ND |
| 2017-09-06 | Q1741335004 | ND |
| 2017-09-06 | Q1741335001 | ND |
| 2018-06-14 | Q1823872005 | ND |
| 2018-06-14 | Q1823872007 | ND |
| 2019-05-29 | Q1929343011 | ND |
| 2019-05-29 | Q1929343013 | ND |