trans-1,2-Dichloroethylene
Sulphur 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 | 12 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 12 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 10 | 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 |
|---|---|---|
| 2014-07-21 | AD93897 | ND |
| 2014-07-21 | AD93894 | ND |
| 2014-07-21 | AD93897 | ND |
| 2014-07-21 | AD93896 | ND |
| 2014-07-21 | AD93895 | ND |
| 2014-07-21 | AD93894 | ND |
| 2014-07-21 | AD93895 | ND |
| 2014-07-21 | AD93896 | ND |
| 2014-10-06 | AD98325 | ND |
| 2014-10-06 | AD98326 | ND |
| 2014-10-06 | AD98325 | ND |
| 2014-10-06 | AD98326 | ND |
| 2015-03-02 | 35177665003 | ND |
| 2015-03-02 | 35177665003 | ND |
| 2017-07-17 | 35324418005 | ND |
| 2017-07-17 | 35324418001 | ND |
| 2017-07-17 | 35324418004 | ND |
| 2017-07-17 | 35324418003 | ND |
| 2017-07-17 | 35324418002 | ND |
| 2017-07-17 | 35324418001 | ND |
| 2017-07-17 | 35324418005 | ND |
| 2017-07-17 | 35324418004 | ND |
| 2017-07-17 | 35324418003 | ND |
| 2017-07-17 | 35324418002 | ND |
| 2017-09-19 | 35337316003 | ND |
| 2017-09-19 | 35337316003 | ND |
| 2019-07-08 | 35480758001 | ND |
| 2019-07-08 | 35480758001 | ND |
| 2019-12-09 | 35518078001 | ND |
| 2019-12-09 | 35518078004 | ND |
| 2019-12-09 | 35518078003 | ND |
| 2019-12-09 | 35518078002 | ND |
| 2019-12-09 | 35518078001 | ND |
| 2019-12-09 | 35518078004 | ND |
| 2019-12-09 | 35518078003 | ND |
| 2019-12-09 | 35518078002 | ND |